1. A multi-connected unit remote installation and maintenance system based on a 5G network is characterized by comprising: the system comprises a multi-connected unit data acquisition module, a data management module and a plurality of interaction backgrounds, wherein each interaction background is provided with an image projector;

the data management module is respectively in communication connection with the multi-connected unit data acquisition module, the data management module and the plurality of interaction backgrounds through a 5G network;

the multi-connected unit data acquisition module is used for acquiring audio and video data of the multi-connected unit in a full flow stage;

wherein the full flow stage comprises: designing, installing, engineering change and normally operating; the audio and video data comprises: collecting working parameters of a unit and physical parameters of a refrigerant flowing in an indoor and outdoor unit connecting pipeline;

the data management module is used for processing the audio and video data and transmitting the processed audio and video data to a corresponding interaction background;

the image projector is used for displaying the processed audio and video data in a virtual stereo image mode.

2. The system for remotely installing and maintaining the multi-connected unit based on the 5G network as claimed in claim 1, wherein the interaction background further comprises an engineering design background, a construction and maintenance background and an expert background;

the engineering design background is used for presenting audio and video data of an installation site to a first user, and transmitting the design data to the data management module after the first user finishes the initially designed design data;

the construction and maintenance background is used for a third user to adjust the design scheme and transmitting the adjusted design scheme to the engineering design background through the data management module;

the expert background is used for receiving an assistance application sent by a first user and/or a third user through the data management module, so that the second user can check and respond to the assistance application, and the assistance application is correspondingly fed back through the data management module to provide consultation service for the whole process of the multi-connected unit.

3. A multi-connected unit remote installation and maintenance system based on 5G network as claimed in claim 2, wherein the multi-connected unit comprises: the indoor unit comprises an outdoor unit and at least one indoor unit connected with the outdoor unit;

the outdoor unit is provided with an outdoor unit data acquisition module, and each indoor unit is provided with an indoor unit data acquisition module;

the outdoor unit data acquisition module is used for acquiring audio and video data of the outdoor unit in a full flow stage;

and the indoor unit data acquisition module is used for acquiring audio and video data of the indoor unit in the whole process stage.

4. A multi-connected unit remote installation and maintenance system based on 5G network as claimed in claim 1, wherein the image projector comprises: the system comprises a design background image projector arranged on an engineering design background, an expert background image projector arranged on an expert background, and a construction and maintenance monitoring background image projector arranged on a construction and maintenance monitoring background;

the design background image projector is used for displaying audio and video data to a first user in a virtual stereo image mode, the expert background image projector is used for displaying audio and video data to a second user in a virtual stereo image mode, and the construction and maintenance monitoring background image projector is used for displaying audio and video data to a third user in a virtual stereo image mode.

5. A multi-connected unit remote installation and maintenance system based on 5G network as claimed in claim 4, wherein the design background image projector is further configured to: responding to a control instruction input by a first user, and editing audio and video data displayed in a virtual stereo image form;

the expert background image projector is further to: responding to a control instruction input by a second user, and editing audio and video data displayed in a virtual stereo image mode;

the construction and maintenance monitoring background image projector is further configured to: and responding to a control instruction input by a third user, and editing the audio and video data displayed in the form of the virtual stereo image.

6. The system for remotely installing and maintaining the multi-connected unit based on the 5G network as claimed in claim 2, wherein the engineering design background is configured with an engineering design module, a first user terminal and a first operator, wherein the engineering design module is used for providing design operation interaction for a first user;

the expert background is provided with a second operator for providing design operation interaction for a second user;

the construction and maintenance background is provided with a second user terminal and a third operator which provide design operation interaction for a third user;

wherein the first user is a designer, the second user is an expert, and the third user is at least one of a constructor and an equipment maintainer.

7. The system for remotely installing and maintaining the multi-connected unit based on the 5G network is characterized in that the construction and maintenance background is further used for sending a control instruction of a third user to the data management module, and transmitting the control instruction to the outdoor unit data acquisition module and/or the indoor unit data acquisition module through the data management module so as to control the outdoor unit data acquisition module to acquire the audio and video data of the outdoor unit and/or control the indoor unit data acquisition module to acquire the audio and video data of the indoor unit;

the system comprises an outdoor unit data acquisition module, an indoor unit data acquisition module, a data processing module and a data processing module, wherein the outdoor unit data acquisition module is used for acquiring outdoor unit audio and video data of an outdoor unit;

the outdoor unit data acquisition module is used for regulating and controlling working parameters of an outdoor unit through a first actuator and feeding back audio and video data of the outdoor unit to the construction and maintenance background through a data management module;

the indoor unit data acquisition module is used for regulating and controlling working parameters of an indoor unit through an indoor unit actuator and feeding back audio and video data of the indoor unit to the construction and maintenance background through the data management module;

wherein the audio and video data comprises working parameters, and the working parameters comprise: compressor frequency, electronic expansion valve opening degree and fan motor rotating speed.

8. A remote installation and maintenance method of a multi-connected unit based on a 5G network is characterized by comprising the following steps:

s100, acquiring audio and video data of the multi-connected unit in a full-flow stage by a multi-connected unit data acquisition module;

wherein the full flow stage comprises: designing, installing, engineering change and normally operating; the audio and video data comprises: collecting working parameters of a unit and physical parameters of a refrigerant flowing in an indoor and outdoor unit connecting pipeline;

step S200, after the data management module processes the audio and video data, transmitting the processed audio and video data to a corresponding interactive background;

and step S300, the image projectors arranged in the interactive backstage respectively display corresponding audio and video data in a virtual stereo image mode.

9. The method for remotely installing and maintaining the multi-connected unit based on the 5G network as claimed in claim 8, wherein the interaction background further includes an engineering design background, a construction and maintenance background and an expert background, and the step S200 includes:

s210, an engineering design background presents audio and video data of an installation site to a first user, and after the first user finishes a design scheme, the design scheme is transmitted to a data management module;

s220, a third user adjusts the design scheme through the construction and maintenance background and transmits the adjusted design scheme to the engineering design background through the data management module;

step S230, an expert background receives an assistance application sent by a data management module, and determines whether a sending end of the assistance application is an engineering design background or a construction and maintenance background;

and S240, the second user checks and responds to the assistance application, and correspondingly feeds back the assistance application through the data management module so as to provide consultation service for the whole process of the multi-connected unit.

Background

At present, along with the improvement of the level of people, the demand on an energy-saving air conditioning unit is more and more great, and as one type of an energy-saving air conditioner, a multi-connected unit can realize the function that one outer unit drags a plurality of inner units, has the characteristics of energy conservation, installation space saving, elegant appearance and high grade, and is popularized more and more in scale.

However, the multi-split air conditioner has the following defects in the design, installation and use processes:

1. during engineering design, the method is usually carried out by experience, and the actual operation condition of a unit cannot be scientifically simulated when the unit is used so as to verify the rationality of the design and have the defect that the use matching of the designed product is poor;

2. due to the fact that one is provided with a plurality of pipes, the pipelines are complex, ultra-long pipes often exist, the indoor unit and the outdoor unit are arranged in a large height difference mode, unreasonable reasons such as design and installation often exist according to the existing engineering installation mode, so that the flow resistance of the pipelines is unbalanced, oil return of refrigerating machine oil is not smooth, the oil can be accumulated in a heat exchanger and a flow pipeline of the indoor unit instead of being circulated back to a compressor, and the compressor can be burnt due to oil shortage;

3. when the field design is changed, the defect that the use cannot meet the requirement after the change exists in scientific simulation without full evaluation;

4. in the actual use of the unit, real-time data of the operation of each part of the indoor unit and the outdoor unit cannot be obtained in time, the operation of the unit is difficult to realize and efficiently monitor, and the fault factor caused by the unit can not be found and processed in time, so that the defect of long-term reliable operation of the unit is influenced.

Disclosure of Invention

The invention aims to provide a method and a system for remotely installing and maintaining a multi-connected unit based on a 5G network, which aim to solve one or more technical problems in the prior art and at least provide a beneficial selection or creation condition.

In order to achieve the purpose, the invention provides the following technical scheme:

a multi-connected unit remote installation and maintenance system based on a 5G network comprises: the system comprises a multi-connected unit data acquisition module, a data management module and a plurality of interaction backgrounds, wherein each interaction background is provided with an image projector;

the data management module is respectively in communication connection with the multi-connected unit data acquisition module, the data management module and the plurality of interaction backgrounds through a 5G network;

the multi-connected unit data acquisition module is used for acquiring audio and video data of the multi-connected unit in a full flow stage;

wherein the full flow stage comprises: designing, installing, engineering change and normally operating; the audio and video data comprises: collecting working parameters of a unit and physical parameters of a refrigerant flowing in an indoor and outdoor unit connecting pipeline;

the data management module is used for processing the audio and video data and transmitting the processed audio and video data to a corresponding interaction background;

the image projector is used for displaying the processed audio and video data in a virtual stereo image mode.

Further, the interactive background also comprises an engineering design background, a construction and maintenance background and an expert background;

the engineering design background is used for presenting audio and video data of an installation site to a first user, and transmitting the design data to the data management module after the first user finishes the initially designed design data;

the construction and maintenance background is used for a third user to adjust the design scheme and transmitting the adjusted design scheme to the engineering design background through the data management module;

the expert background is used for receiving an assistance application sent by a first user and/or a third user through the data management module, so that the second user can check and respond to the assistance application, and the assistance application is correspondingly fed back through the data management module to provide consultation service for the whole process of the multi-connected unit.

Further, the multi-connected unit includes: the indoor unit comprises an outdoor unit and at least one indoor unit connected with the outdoor unit;

the outdoor unit is provided with an outdoor unit data acquisition module, and each indoor unit is provided with an indoor unit data acquisition module;

the outdoor unit data acquisition module is used for acquiring audio and video data of the outdoor unit in a full flow stage;

and the indoor unit data acquisition module is used for acquiring audio and video data of the indoor unit in the whole process stage.

Further, the image projector includes: the system comprises a design background image projector arranged on an engineering design background, an expert background image projector arranged on an expert background, and a construction and maintenance monitoring background image projector arranged on a construction and maintenance monitoring background;

the design background image projector is used for displaying audio and video data to a first user in a virtual stereo image mode, the expert background image projector is used for displaying audio and video data to a second user in a virtual stereo image mode, and the construction and maintenance monitoring background image projector is used for displaying audio and video data to a third user in a virtual stereo image mode.

Further, the design back-end image projector is further to: responding to a control instruction input by a first user, and editing audio and video data displayed in a virtual stereo image form;

the expert background image projector is further to: responding to a control instruction input by a second user, and editing audio and video data displayed in a virtual stereo image mode;

the construction and maintenance monitoring background image projector is further configured to: and responding to a control instruction input by a third user, and editing the audio and video data displayed in the form of the virtual stereo image.

Further, the engineering design background is provided with an engineering design module, a first user terminal and a first operator, wherein the engineering design module provides design operation interaction for a first user;

the expert background is provided with a second operator for providing design operation interaction for a second user;

the construction and maintenance background is provided with a second user terminal and a third operator which provide design operation interaction for a third user;

wherein the first user is a designer, the second user is an expert, and the third user is at least one of a constructor and an equipment maintainer.

Further, the construction and maintenance background is also used for sending a control instruction of a third user to the data management module, and transmitting the control instruction to the outdoor unit data acquisition module and/or the indoor unit data acquisition module through the data management module so as to control the outdoor unit data acquisition module to acquire the audio and video data of the outdoor unit and/or control the indoor unit data acquisition module to acquire the audio and video data of the indoor unit;

the system comprises an outdoor unit data acquisition module, an indoor unit data acquisition module, a data processing module and a data processing module, wherein the outdoor unit data acquisition module is used for acquiring outdoor unit audio and video data of an outdoor unit;

the outdoor unit data acquisition module is used for regulating and controlling working parameters of an outdoor unit through a first actuator and feeding back audio and video data of the outdoor unit to the construction and maintenance background through a data management module;

the indoor unit data acquisition module is used for regulating and controlling working parameters of an indoor unit through an indoor unit actuator and feeding back audio and video data of the indoor unit to the construction and maintenance background through the data management module;

wherein the audio and video data comprises working parameters, and the working parameters comprise: compressor frequency, electronic expansion valve opening degree and fan motor rotating speed.

A multi-connected unit remote installation and maintenance method based on a 5G network comprises the following steps:

s100, acquiring audio and video data of the multi-connected unit in a full-flow stage by a multi-connected unit data acquisition module;

wherein the full flow stage comprises: designing, installing, engineering change and normally operating; the audio and video data comprises: collecting working parameters of a unit and physical parameters of a refrigerant flowing in an indoor and outdoor unit connecting pipeline;

step S200, after the data management module processes the audio and video data, transmitting the processed audio and video data to a corresponding interactive background;

and step S300, the image projectors arranged in the interactive backstage respectively display corresponding audio and video data in a virtual stereo image mode.

Further, the interactive background further comprises an engineering design background, a construction and maintenance background and an expert background, and the step S200 comprises:

s210, an engineering design background presents audio and video data of an installation site to a first user, and after the first user finishes a design scheme, the design scheme is transmitted to a data management module;

s220, a third user adjusts the design scheme through the construction and maintenance background and transmits the adjusted design scheme to the engineering design background through the data management module;

step S230, an expert background receives an assistance application sent by a data management module, and determines whether a sending end of the assistance application is an engineering design background or a construction and maintenance background;

and S240, the second user checks and responds to the assistance application, and correspondingly feeds back the assistance application through the data management module so as to provide consultation service for the whole process of the multi-connected unit.

The invention has the beneficial effects that: the invention discloses a method and a system for remotely installing and maintaining a multi-connected unit based on a 5G network, wherein the method and the system utilize the characteristic of large transmission flow of the 5G network, and carry out simulation calculation, display and modification on the design of the multi-connected unit through a virtual stereo image so as to determine an optimal design scheme; the audio and video data of the multi-connected unit in the full-flow stage are monitored in real time through the virtual stereo images, and the multi-connected unit is assisted by a plurality of interactive backstage assistance, so that the efficient and reliable operation of the multi-connected unit in the design, installation, engineering change and normal operation stages is finally realized.

The following technical effects are achieved:

through the displayed virtual stereo image, audio and video data are integrated, the display interface is greatly simplified, so that designers, engineering constructors and terminal clients can observe conveniently, and the working efficiency can be effectively improved.

Through the virtual stereo image display control, reasonable engineering design and engineering installation are finally realized by utilizing visual virtual stereo images among designers, engineering constructors and terminal clients through sufficient communication, so that the multi-connected unit is reasonable in matching, uniform in refrigerant distribution and smooth in compressor oil return, the unit is improved, and especially under the condition of super-long piping and indoor and outdoor unit large height difference setting, the unit has the effect of operation reliability.

Through operation and mutual communication of the virtual stereo images among designers, constructors and terminal clients, the engineering design is changed more reasonably, and special requirements of the terminal clients are fully met.

Through the virtual three-dimensional image display control, the operation use parameters of the parts of the unit are known, and possible fault factors are eliminated in time, so that the effect of ensuring the long-term reliable operation of the unit is achieved.

By means of assistance of an expert background, more accurate monitoring of unit engineering design, engineering installation and change and use and maintenance can be achieved, and finally the effect of improving the unit operation efficiency is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

Fig. 1 is a schematic block diagram of a structure of a multi-connected unit remote installation and maintenance system based on a 5G network in an embodiment of the present invention;

fig. 2 is a schematic view of a scene structure of a multi-connected unit remote installation and maintenance system based on a 5G network in the embodiment of the present invention;

fig. 3 is a schematic flow chart of a method for remotely installing and maintaining a multi-connected unit based on a 5G network in the embodiment of the present invention.

Detailed Description

The conception, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the schemes and the effects of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

Referring to fig. 1, an embodiment of the present invention provides a multi-connected unit remote installation and maintenance system based on a 5G network, where the system includes: the system comprises a multi-connected unit data acquisition module, a data management module 2 and a plurality of interaction backgrounds, wherein each interaction background is provided with an image projector;

the data management module 2 is in communication connection with the multi-connected unit data acquisition module, the data management module 2 and the plurality of interaction backgrounds through a 5G network respectively;

the multi-connected unit data acquisition module is used for acquiring audio and video data of the multi-connected unit in a full flow stage;

wherein the full flow stage comprises: designing, installing, engineering change and normally operating; the audio and video data comprises: collecting working parameters of a unit and physical parameters of a refrigerant flowing in an indoor and outdoor unit connecting pipeline;

the data management module 2 is used for processing the audio and video data and then transmitting the processed audio and video data to a corresponding interaction background;

the image projector is used for displaying the processed audio and video data in a virtual stereo image mode.

Referring to fig. 2, as a further improvement of the above embodiment, the interaction background further includes an engineering design background 4, a construction and maintenance background 6, and an expert background 5;

the engineering design background 4 is used for presenting audio and video data of an installation site to a first user, and transmitting the design data to the data management module 2 after the first user finishes the initially designed design data;

the construction and maintenance background 6 is used for a third user to adjust the design scheme and transmits the adjusted design scheme to the engineering design background 4 through the data management module 2;

the expert background 5 is used for receiving an assistance application sent by a first user and/or a third user through the data management module 2, so that the second user can check and respond to the assistance application, and the assistance application is correspondingly fed back through the data management module 2 to provide consultation service for the whole process of the multi-connected unit.

As a further improvement of the above embodiment, the multi-connected unit includes: the indoor unit comprises an outdoor unit and at least one indoor unit connected with the outdoor unit;

the outdoor unit is provided with an outdoor unit data acquisition module 11, and each indoor unit is provided with an indoor unit data acquisition module 73;

the outdoor unit data acquisition module 11 is configured to acquire audio and video data of the outdoor unit 1 at a full process stage;

the indoor unit data acquisition module 73 is configured to acquire audio and video data of the indoor unit 7 at a full process stage.

As a further improvement of the above embodiment, the image projector includes: a design background image projector 41 arranged on the engineering design background 4, an expert background image projector 51 arranged on the expert background, and a construction and maintenance monitoring background image projector 61 arranged on the construction and maintenance monitoring background;

the design back-end image projector 41 is configured to display audiovisual data to a first user in the form of a virtual stereoscopic image, the expert back-end image projector 51 is configured to display audiovisual data to a second user in the form of a virtual stereoscopic image, and the construction and maintenance monitoring back-end image projector 61 is configured to display audiovisual data to a third user in the form of a virtual stereoscopic image.

As a further improvement of the above embodiment, the background image projector 41 is designed to: responding to a control instruction input by a first user, and editing audio and video data displayed in a virtual stereo image form;

the expert background image projector 51 is also configured to: responding to a control instruction input by a second user, and editing audio and video data displayed in a virtual stereo image mode;

the construction and maintenance monitoring background image projector 61 is further configured to: and responding to a control instruction input by a third user, and editing the audio and video data displayed in the form of the virtual stereo image.

As a further improvement of the above embodiment, the engineering background 4 is configured with an engineering module 3 for providing design operation interaction for the first user, a first user terminal 42a, a first operator 43;

the expert background 5 is provided with a second operator 53 providing a second user with design operation interaction;

the construction and maintenance background 6 is provided with a second user terminal 62 and a third operator 63 for providing design operation interaction for a third user;

wherein the first user is a designer 42, the second user is an expert 52, and the third user is at least one of a builder 62a and an equipment maintainer 62 b.

In this embodiment, one outdoor unit may be connected to at least one indoor unit, and switching between the refrigeration and heating modes of the multi-connected unit is achieved by changing the flow direction of the refrigerant in the refrigeration system pipeline of the multi-connected unit. The unit working parameters comprise unit current, indoor and outdoor fan air temperature and humidity, and compressor and motor running current; specifically, the outdoor unit data acquisition module 11 is arranged at the outdoor side, and the design, installation, engineering change and audio/video data in the normal operation stage of the outdoor unit 1 are acquired by the outdoor unit data acquisition module 11; the indoor unit data collection module 73 is disposed at the indoor side, and in an exemplary embodiment, the indoor unit 7 includes a first indoor unit 711, a second indoor unit 721, and a third indoor unit 741; the audio and video data of all stages of design, installation, engineering change and normal operation of the first indoor unit 711, the second indoor unit 721 and the third indoor unit 741 are collected by the indoor unit data collection module 73, meanwhile, the outdoor unit data collection module 11 and the indoor unit data collection module 73 collect physical parameters such as pressure, flow rate, temperature, flow resistance, oil storage in a pipeline, return oil of a compressor and the like of a refrigerant flowing in a connecting pipeline of the indoor unit and the outdoor unit (namely in a liquid collection header pipe, a gas collection header pipe 9 and a communicated pipeline) besides working parameters such as unit current, indoor and outdoor unit air temperature, humidity, compressor and motor operation current, and the audio and video data are analyzed and sorted by the data management module 2 and then transmitted to the image projector; and the processed audio and video data are displayed in the form of virtual stereo images, and the audio and video data are transmitted through a 5G wireless network.

In the embodiment, the quick, timely and accurate response is realized for the application provided by the applicant; meanwhile, through mutual communication, the applicant can understand the provided problems more deeply in an interactive mode, the same problems are prevented from being repeatedly provided, the problems are efficiently processed, resources are saved, the expert background 5 receives the assistance application of the applicant through the data management module 2, and mutual communication between the applicant and the expert 52 of the expert background 5 is finally achieved. The applicant is: a designer, builder, or equipment maintainer; multiple applicants may make consultation requests to the expert backoffice separately or in combination. The multi-connected unit can be consulted by related personnel through the expert background at any time in the process of engineering design, construction or operation and maintenance, so that the effect of all-weather and no dead angle answering is achieved. Therefore, the effects that the engineering design, construction or operation maintenance of the multi-connected unit is more scientific, reasonable and efficient and a solid foundation can be finally laid for improving the operation efficiency of the unit are achieved.

In actual operation, during engineering design, engineering construction or monitoring operation of the multi-connected unit, the generated audio and video data are collected by the outdoor unit data collection module 11; after the indoor unit data acquisition module 73 is collected, 5G network data is used for transmission, the data is received and processed by the data management module 2, the 5G network data is used for continuous transmission, the data is finally transmitted to the design background image projector 41, the expert background image projector 51 and the construction and maintenance monitoring background image projector 61, a virtual stereo image is generated in a virtual space through the design background image projector 41, the expert background image projector 51 and the construction and maintenance monitoring background image projector 61, and reasonable design and construction of the multi-connected unit are finally realized or the operation of the multi-connected unit is accurately monitored by means of expert assistance through interaction among corresponding designers, constructors and end users or interaction among end users and equipment maintainers.

In view of that 5G can provide higher speed, lower time delay, more connection number (support more user access), faster moving speed, higher security and more flexible service deployment capability (the speed of user experience can reach 1Gbps at most) compared with 4G, it can gracefully cope with stereoscopic audio/video data requiring huge data transmission volume, and if 4G network is utilized, there are a series of problems that the data transmission channel is blocked and cannot be used normally because it cannot bear the transmission of large data volume; the method is particularly suitable for multi-connected units, the required audio and video virtual stereo images are required to be displayed simultaneously on an external unit and a plurality of internal units, the 5G wireless network can be fully utilized to provide the required audio and video virtual stereo images synchronously and in real time for relevant users such as relevant designers, constructors, terminal clients, equipment maintainers and the like, the displayed audio and video virtual stereo images can be observed visually, the virtual stereo images are controlled to realize mutual communication, and reasonable and scientific engineering design, engineering construction and equipment operation and maintenance of the multi-connected units are ensured by assistance of expert backgrounds, so that the multi-connected units can be used reliably and efficiently normally, and a series of problems caused by empirical operation in the design, construction and equipment maintenance processes of the multi-connected units are effectively solved.

In order to solve the problems of the multi-connected unit in the engineering design, construction or operation maintenance process, ensure that the technical problems in the engineering design, construction or operation maintenance process are solved more scientifically, reasonably and efficiently, solve the problems from the source, and finally lay a solid foundation for improving the operation efficiency of the unit,

in this embodiment, after the data management module 2 analyzes and collates the data, the data is converted into audio/video data capable of being simulated by using a computer simulation technology, a virtual stereo image is generated in a virtual space by a corresponding image projector, and the designer 62a and the designer 42 communicate with each other to modify and perfect the design scheme, so as to finally generate a determined virtual design stereo image and project budget data, which are provided to the builder for on-site construction and purchase of related materials.

When the designer 42 interacts with the constructor 62a via the first user terminal 42a, if the design is inaccurate in whole or detail and needs to be assisted by the expert 52 disposed in the expert background 5, the designer 42 can operate via the first operator 43 disposed in the engineering background 4 to provide an audio/video application based on the engineering virtual stereo image 44, transmit the audio/video application to the design background image projector 41 via the 5G wireless network, transmit the audio/video application to the engineering design module 3 via the design background image projector 41, directly transmit the application to the engineering module 3 via the engineering module 3 or the first operator 43, finally transmit the application to the data management module 2, analyze and arrange the application via the data management module 2, transmit the quantified application to the expert background image projector 51 disposed in the expert background 5, the expert background virtual stereoscopic image 54 is displayed through the expert background image projector 51, the expert 52 judges the expert background virtual stereoscopic image 54, forms audio-video opinions according to the expert background virtual stereoscopic image 54 through the operation of the second operator 53, transmits the audio-video opinions to the data management module 2 through the expert background image projector 51, and finally displays the audio-video images or the text opinions through the engineering design virtual stereoscopic image 44 through the design background image projector 41 or displays the audio-video images or the text opinions on the first operator 43 and finally feeds the audio-video opinions back to the designer 42 for the designer 42 to refer to, thereby finally realizing the interactive communication between the designer 42 and the expert 52.

Under the normal design condition, the aim of realizing efficient, scientific and reasonable design of the multi-connected unit on the basis of meeting the use of terminal customers is finally achieved by realizing benign communication and communication between the designer 42 and the constructor 62a and observing, modifying and perfecting in a virtual operation mode by using a computer simulation technology, the design defects existing in the engineering design stage by the conventional means can be avoided, and the problems can not be effectively found, so that the aim of solving the defects in the prior art from the design source is finally realized by avoiding the design, the operation of the multi-connected unit is simulated by using the computer simulation technology, the engineering design of the multi-connected unit is solved, particularly when the indoor and outdoor units have ultra-long piping and large height difference, the reasonable engineering design is verified by simulation, and when the ultra-long piping and the large height difference are simulated, the operating conditions of the indoor machine and the outdoor machine can clearly know the oil return, capacity output, suction and exhaust pressure change and other parameters of the indoor machine and the outdoor machine, and accordingly reasonable design evasion is made, and the problems are solved from the design source.

In order to achieve the aim, the engineering design can be scientifically and reasonably changed on the basis of meeting the requirements of terminal customers in order to ensure that the engineering change problem can be communicated and communicated with designers in time during the construction process, so that a good foundation is laid for the normal operation of subsequent equipment.

In this embodiment, in the construction process, when the constructor 62a needs to change the design scheme, the constructor 62a may directly display the data to be modified on the construction and maintenance background 6 in the form of the virtual three-dimensional image 64, modify and set the design scheme, transmit the preliminarily completed design-modified scheme data to the data management module 2, analyze and sort the data by the data management module 2, and finally feed the data back to the designer 42 via the engineering design module 3, the designer 42 performs the optimized modification on the modified design scheme, and finally transmits the optimized design scheme data to the construction and maintenance background image projector 61 via the data management module 2 after being verified by the computer simulation technology via the data management module 2, so as to generate the modified construction and maintenance virtual three-dimensional image 64 in the virtual space, and the constructor 62a performs the final modification, the background image 64 via the second user terminal 62, After determination, the constructor 62a performs the alteration construction according to the determined design scheme and the material details and cost after the relevant alteration.

In view of the design and construction delay of the multi-connected unit, the users of the first user terminal 42a and the second user terminal 62 may be the same person or different persons, for example, the multi-connected unit design for commercial property, the first user terminal 42a may be a developer, after the design scheme is completed, the construction is not required to be performed immediately, but after a specific customer purchases the design scheme, the design scheme is provided to the specific customer, at this time, the specific customer reorganises the construction, and at this time, the specific customer is the user of the second user terminal 62.

When a constructor 62a needs to assist in construction problems during construction, the constructor 62a may display the construction and maintenance background 6 in the form of a virtual stereoscopic image 64 through a third operator 63, transmit an assistance request to an image projector 61 of the construction and maintenance background 6, and then transmit the request data to the data management module 2 through the construction and maintenance background image projector 61, or directly transmit the request data to the data management module 2 through the third operator 63, analyze and arrange the request by the data management module 2, transmit the quantized request to an expert background image projector 51 provided in the expert background 5, display the expert background virtual stereoscopic image 54 through the expert background image projector 51, the expert 52 may determine the expert virtual stereoscopic image 54 through research and judgment on the expert background virtual stereoscopic image 54, and manipulate the opinion through the expert background virtual stereoscopic image 54, or the second operator 53 is operated to transmit the audio and video opinions to the data management module 2 through the expert background image projector 51, and the opinion data is transmitted to the construction and maintenance monitoring background image projector 61 through the data management module 2, and is displayed on the construction and maintenance background virtual stereo image 64 through the construction and maintenance monitoring background image projector 61, or the constructor 62a and the second user terminal 62 on the second operator 53 can inquire the results on the construction and maintenance background virtual stereo image 64, during the construction process, the second user terminal 62 can supervise the construction and provide related opinions, and realize the communication with the constructor 62a and the expert 52, and finally realize the interaction among the constructor 62a, the expert 52 and the constructor 62a, so as to meet the requirement of scientific reasonable change.

After the engineering construction is completed, the operation of the multi-connected unit can be observed by further displaying virtual stereo images in the process of checking and accepting the test operation of the multi-connected unit so as to verify the unit, particularly verify the rationality of unit design and engineering installation under the conditions of overlong piping and large height difference of indoor and outdoor units, and modify and perfect the found problems.

As a further improvement of the above embodiment, the construction and maintenance background 6 is further configured to send a control instruction of a third user to the data management module 2, and transmit the control instruction to the outdoor unit data acquisition module 11 and/or the indoor unit data acquisition module 73 through the data management module 2, so as to control the outdoor unit data acquisition module 11 to acquire the audio and video data of the outdoor unit 1 and/or control the indoor unit data acquisition module 73 to acquire the audio and video data of the indoor unit 7;

the system is used for receiving the audio and video data of the outdoor unit 1 fed back by the outdoor unit data acquisition module 11 and/or receiving the audio and video data of the indoor unit 7 fed back by the indoor unit data acquisition module 73;

the outdoor unit data acquisition module 11 is configured to regulate and control working parameters of an outdoor unit 1 through a first actuator 18, and feed back audio and video data of the outdoor unit 1 to the construction and maintenance background 6 through a data management module 2;

the indoor unit data acquisition module 73 is used for regulating and controlling working parameters of an indoor unit 7 through an indoor unit actuator and feeding back audio and video data of the indoor unit 7 to the construction and maintenance background 6 through the data management module 2;

wherein the audio and video data comprises working parameters, and the working parameters comprise: compressor frequency, electronic expansion valve opening degree and fan motor rotating speed.

After the project acceptance is finished, in order to further save resources and ensure that the multi-connected unit is put into use, the on-line monitoring of the multi-connected unit is realized, the normal and reliable operation of the multi-connected unit is ensured, the equipment maintainer 62b can send a control instruction through the second user terminal 62 or the third operator 63 according to the virtual stereo image 64 displayed in real time by the construction and maintenance background 6, the control instruction is transmitted to the outdoor unit data acquisition module 11 and the indoor unit data acquisition module 73 through the data management module 2, the equipment maintainer 62b continues to use the construction and maintenance background 6, indoor and outdoor unit audio and video data acquired by the outdoor unit data acquisition module 11 and the indoor unit data acquisition module 73 are transmitted to the data management module 2 on the construction and maintenance background 6, and the processed audio and video data are transmitted to the construction and maintenance background image projector 61 after being analyzed and processed by the data management module 2, and finally, generating a construction and maintenance background image projector 64 in the virtual space through the construction and maintenance background image projector 61, wherein the equipment maintainer 62b can ensure the normal and reliable operation of the multi-connected unit through monitoring the construction and maintenance background image projector 64.

At this time, the outdoor unit 1, the first indoor unit 711, the second indoor unit 721, the third indoor unit 741, and the operation parameters of the refrigeration system are all displayed on the construction and maintenance background image projector 64, the equipment maintainer 62b can control the construction and maintenance background image projector 64 through the second user terminal 62 or the third operator 63 according to the blank images displayed by the real-time construction and maintenance background image projector 64, and finally transmit the control instruction to the outdoor unit data acquisition module 11 and the indoor unit data acquisition module 73 through the data management module 2, after the outdoor unit data acquisition module 11 receives the control instruction,

the outdoor unit data acquisition module 11 regulates and controls working parameters of the outdoor unit 1 through a first actuator 18, and feeds the working parameters of the outdoor unit 1 back to the outdoor unit data acquisition module 11; the working parameters comprise compressor frequency, electronic expansion valve opening degree and fan motor rotating speed, the indoor unit data acquisition module 73 is respectively connected with a plurality of indoor unit actuators, and each indoor unit actuator regulates and controls the working parameters of one indoor unit 7; the indoor unit data acquisition module 73 regulates and controls working parameters of a first indoor unit 711 through a first indoor unit actuator 712; the working parameters of the second indoor unit 721 are regulated and controlled by a second indoor unit actuator 722; working parameters of the third indoor unit 741 are regulated and controlled by the third indoor unit actuator 742, and include data such as compressor frequency, electronic expansion valve opening degree, fan motor rotation speed, and similarly, the first indoor unit actuator 712, the second indoor unit actuator 722, and the third indoor unit actuator 742 all feed back the working parameters to the indoor unit data acquisition module 73.

In order to make the multi-connected unit more compact, the outdoor unit data acquisition module 11 and the first actuator 18 are integrated in the outdoor unit 1; the indoor unit data acquisition module 73 comprises a plurality of indoor unit data acquisition sub-modules, and each indoor unit data acquisition sub-module is respectively integrated with an indoor unit actuator and arranged in an indoor unit; in this embodiment, the indoor unit data acquisition module 73 may be divided into a plurality of modules, and respectively integrated with the first indoor unit actuator 712 and disposed in the first indoor unit 711; integrated with the second indoor unit actuator 722, provided in the second indoor unit 721; and the third indoor unit executor 742 is integrated and arranged in the third indoor unit 741, and then directly transmits the related acquired audio and video data to the data management module 2, or in other suitable manners.

During the actual monitoring of the operation of the multi-connected unit, if the equipment maintainer 62b cannot solve the problem, the application data can be transmitted to the construction and maintenance background image projector 61 through the third operator 63 or the construction and maintenance background virtual stereo image 64, or the application data can be directly transmitted to the data management module 2 through the third operator 63, analyzed and collated by the data management module 2, and the quantified application data is transmitted to the expert background image projector 51 arranged in the expert background 5, the expert background virtual stereo image 54 is displayed through the expert background image projector 51, the expert 52 performs judgment on the expert background virtual stereo image 54, and the opinion is controlled through the expert background virtual stereo image 54, or transmitting the audio and video opinions to the second operator 53 through the expert background image projector 51 to the data management module 2, transmitting the opinion data to the construction and maintenance monitoring background image projector 61 through the data management module 2, and displaying the opinion data on the construction and maintenance background virtual stereo image 64 through the construction and maintenance monitoring background image projector 61, or on the second operator 53; the equipment maintainer 62b may query the results on the construction and maintenance background virtual stereo image 64 to resolve the difficulties encountered by the equipment maintainer 62 b.

In the operation process of the monitoring equipment, the constructor 62a and the expert 52 can communicate at any time, interaction between the expert 52 and the equipment maintainer 62b is finally realized, and interaction with the second user terminal 62 can be realized when needed, so that the purpose of effectively monitoring reliable and efficient operation of the multi-connected unit is met, and particularly the unit is ensured to be in an ultra-long pipe and to be reliably and efficiently operated under the condition of large height difference between an indoor unit and an outdoor unit, wherein the ultra-long pipe generally refers to the installation that the length of a connecting pipe from the outdoor unit to the farthest indoor unit exceeds 100 meters, and the height difference between the outdoor unit and the highest (or lowest) indoor unit exceeds 25 meters.

The method is designed and installed according to a conventional mode, the maximum pipe length of the existing multi-connected unit can be 100 meters, the height difference between an indoor unit and an outdoor unit can be 25 meters, the designed pipeline can be further ensured to be more reasonable through computer simulation design and relevant verification means verification, and then the control and communication of virtual stereo images, so that the maximum pipe length can exceed 100 meters, the height difference can exceed 25 meters, or fewer required materials can be obtained under the condition that the multi-connected unit has the same output capacity; under the condition of an ultra-long pipe, due to the action of resistance, the capacity of the multi-connected unit can be attenuated to different degrees, and the attenuation of the capacity of the multi-connected unit can be effectively delayed through the design, the communication and other means.

The electronic expansion valve adopted in the embodiment is arranged in the indoor unit, and can also be arranged separately; when cooling, the refrigerant is throttled by the electronic expansion valve disposed at the indoor side, and when heating, the refrigerant bypasses the electronic expansion valve disposed at the indoor side, and is throttled by the electronic expansion valve disposed at the outdoor unit 1, if the outdoor unit 1 has fewer indoor units, such as one outdoor unit, the electronic expansion valve may adopt other throttling devices, such as a thermostatic expansion valve, or a capillary tube or other suitable throttling devices.

Referring to fig. 3, fig. 3 is a schematic flow chart of a method for remotely installing and maintaining a multi-connected unit based on a 5G network, where the method includes the following steps:

s100, acquiring audio and video data of the multi-connected unit in a full-flow stage by a multi-connected unit data acquisition module;

wherein the full flow stage comprises: designing, installing, engineering change and normally operating; the audio and video data comprises: collecting working parameters of a unit and physical parameters of a refrigerant flowing in an indoor and outdoor unit connecting pipeline;

step S200, after the data management module processes the audio and video data, transmitting the processed audio and video data to a corresponding interactive background;

and step S300, the image projectors arranged in the interactive backstage respectively display corresponding audio and video data in a virtual stereo image mode.

As a further improvement of the above embodiment, the interaction background further includes an engineering design background, a construction and maintenance background, and an expert background, and the step S200 further includes:

s210, an engineering design background presents audio and video data of an installation site to a first user, and after the first user finishes a design scheme, the design scheme is transmitted to a data management module;

s220, a third user adjusts the design scheme through the construction and maintenance background and transmits the adjusted design scheme to the engineering design background through the data management module;

step S230, an expert background receives an assistance application sent by a data management module, and determines whether a sending end of the assistance application is an engineering design background or a construction and maintenance background;

and S240, the second user checks and responds to the assistance application, and correspondingly feeds back the assistance application through the data management module so as to provide consultation service for the whole process of the multi-connected unit.

As shown in fig. 2, the multi-connected unit provided by the present invention includes a multi-connected unit outdoor unit 1, a first indoor unit 711, a second indoor unit 721, and a third indoor unit 741, wherein the multi-connected unit outdoor unit 1 is respectively communicated with liquid pipes in the first indoor unit 711, the second indoor unit 721, and the third indoor unit 741 through a liquid collecting main pipe 8; the gas collecting main pipe 9 is respectively communicated with gas pipes in the first indoor unit 711, the second indoor unit 721 and the third indoor unit 741, and the liquid collecting main pipe 8 realizes liquid pipe communication between the indoor unit and the outdoor unit through a liquid pipe stop valve 15 which is communicated with the outdoor unit 1; the gas collecting main pipe 9 realizes gas pipe communication between the indoor machine and the outdoor machine through a gas pipe stop valve 16 communicated with the outdoor machine 1; at least one indoor unit may be provided according to the capacity of the outdoor unit 1, or more than the first indoor unit 711, the second indoor unit 721, and the third indoor unit 741 may be provided; for example, if the refrigerating capacity of the outdoor unit 1 is 1, and the capacity is small, one indoor unit can be set; if the capacity of the outdoor unit 1 is large, for example, the refrigerating capacity is 20, dozens of indoor units can be arranged, or even more indoor units can be arranged, as long as the indoor units can work normally.

In actual use, the outdoor unit 1 can also be arranged in a modularized manner, i.e. a plurality of outdoor units can be arranged in a modularized manner, at the moment, the number of indoor units is increased, and the use requirements of different use occasions, such as business buildings and the like, can be met, so that the characteristic that multiple units are connected by one to save the installation space is realized.

In order to further achieve the purpose of adjusting different requirements of cold/heat load according to different time periods of the used space and achieve the purpose of energy saving, preferably, the compressor 17 is a variable frequency compressor; meanwhile, in order to achieve the purpose of reducing the unit operation noise on the basis of energy conservation, preferably, the fan motor of the outdoor unit and the fan motor of the indoor unit are direct current motors.

The compressor in the embodiment is a variable frequency compressor, and can adopt an alternating current variable frequency compressor, also can adopt a direct current variable frequency compressor, preferably selects the direct current variable frequency compressor, and is matched with an outdoor fan motor and an indoor fan motor which are also direct current motors for use, the running energy efficiency of the full direct current multi-connected unit is higher, and the full direct current multi-connected unit is generally used at present; the fixed frequency compressor may use a presently conventional compressor, such as a digital scroll fixed frequency compressor, or other suitable compressor.

In some embodiments, the switching between the refrigeration mode and the heating mode of the multi-connected unit is realized by changing the flow direction of a refrigerant in a refrigeration system pipeline of the multi-connected unit, specifically:

in the cooling mode, the high-temperature and high-pressure gaseous refrigerant compressed by the compressor 17 provided in the outdoor unit 1 is introduced into the four-way switching valve 14 through the discharge pipe of the compressor 17, at this time, the coil of the four-way reversing valve 14 is not electrified, the gas refrigerant flows out of the four-way reversing valve 14 and enters the heat exchange tube of the condenser 13, through the rotation of the condensing fan 12 arranged on the top of the outdoor unit 1 and on the upper part of the condenser 13, the external air forcibly flows over the outer surface of the heat exchange tube of the condenser 13 through the rotation of the condensing fan 12, and forcibly exchanges heat with the refrigerant in the heat exchange tube of the condenser 13, the refrigerant releases heat to the external air, and is condensed into high-pressure liquid, and at the moment, the high-pressure liquid flows through the liquid tube stop valve 15 through the liquid tube communicated with the liquid tube stop valve 15 and enters the liquid collecting header 8, divide into 2 ways through level 1 liquid pipe distributor 714, divide into 1 st way, 2 nd way, and the concrete flow direction is:

the 1 st path flows into the liquid inlet pipe of the evaporator of the first indoor unit 711 disposed in the 1 st indoor space 71, and flows into the evaporator heat exchange pipe of the first indoor unit 711 after being throttled by the 1 st electronic expansion valve 713 disposed in communication with the liquid inlet pipe of the evaporator of the first indoor unit 711; the air in the 1 st indoor space 71 is forced to flow through the surface of the heat exchange tube of the evaporator of the first indoor unit 711 by the fan of the first indoor unit 711, the refrigerant is evaporated in the heat exchange tube, the heat of the air flowing through the outside of the heat exchange tube is absorbed, the air temperature is reduced circularly, and finally the purpose of reducing the temperature of the 1 st indoor space 71 is achieved, and the refrigerant which is evaporated and absorbs the heat is changed into low-pressure gaseous refrigerant and flows out of the evaporator through the air pipe of the evaporator of the first indoor unit 711.

The 2 nd path continues to pass through the liquid collecting pipe, because the refrigerant flow is reduced, the diameter of the liquid collecting pipe is smaller than that of the liquid collecting main pipe 8 which just enters the 1 st level liquid pipe distributor 714, and after flowing into the 2 nd level liquid pipe distributor 724, the liquid collecting pipe is divided into a path A and a path B, wherein the path A flows into the liquid inlet pipe of the evaporator of the second indoor machine 721 arranged in the 2 nd indoor space 72, and after throttling by a 2 nd electronic expansion valve 723 which is arranged and communicated with the liquid inlet pipe of the evaporator of the second indoor machine 721, the liquid flows into the heat exchange pipe of the evaporator of the second indoor machine 721, the air in the 2 nd indoor space 72 is forced to flow through the surface of the heat exchange pipe of the evaporator of the second indoor machine 721, the refrigerant is evaporated in the heat exchange pipe, the heat of the air outside of the heat exchange pipe is absorbed, the air temperature is circularly reduced, and finally the purpose of reducing the temperature of the 2 nd indoor space 72 is achieved, the refrigerant evaporated and absorbing heat is changed into a low-pressure gaseous refrigerant, passes through the air pipe of the evaporator of the second indoor unit 721, and flows out of the evaporator.

The path B is not shunted any more, and directly flows into a liquid inlet pipe of an evaporator of the third indoor unit 741 disposed in the 3 rd indoor space 74, and flows into an evaporator heat exchange pipe of the third indoor unit 741 after being throttled by a 3 rd electronic expansion valve 723 disposed in communication with the liquid inlet pipe of the evaporator of the third indoor unit 741, and forces air in the 3 rd indoor space 74 to flow through the surface of an evaporator heat exchange pipe of the third indoor unit 741 by a fan of the third indoor unit 741, so that the refrigerant evaporates in the heat exchange pipe and absorbs heat of the air flowing through the outside of the heat exchange pipe, and the air temperature is reduced by circulation, thereby finally achieving the purpose of reducing the temperature of the 3 rd indoor space 74, and the refrigerant evaporating and absorbing heat is changed into a low-pressure gaseous refrigerant, and flows out of the evaporator through an air pipe of the evaporator of.

The gaseous refrigerant flowing out of the air pipe of the evaporator of the third indoor unit 741 enters the 2 nd stage gas-liquid pipe distributor 725, is gathered together with the refrigerant flowing out of the air pipe of the evaporator of the second indoor unit 721 in the 2 nd stage gas-liquid pipe distributor 725, the gathered gaseous refrigerant continuously flows out of the 2 nd stage gas-liquid pipe distributor 725, enters the next stage air pipe, and flows out of the air pipe refrigerant of the evaporator of the first indoor unit 711, is gathered together in the 1 st stage gas-liquid pipe distributor 715, finally flows out of the 1 st stage gas-liquid pipe distributor 715, flows out of the indoor unit 7 through the gas collecting main 9 communicated with the 1 st stage gas-liquid pipe distributor 715, enters the four-way reversing valve 14 through the gas pipe stop valve 16, then enters the compressor 17 through the gas suction pipe of the compressor through the four-way reversing valve 14, and then enters the compressor 17 to realize cyclic compression.

The low-pressure gas refrigerant that gathers constantly increases according to, and the trachea subassembly increases, finally reaches gas collection house steward 9 pipe diameter, like this, can guarantee to converge evenly, and the oil return is even, and fluid resistance is not too big, and compressor 17 need not to increase too much power for overcome the gas flow resistance, can guarantee that the unit operation effect that ally oneself with is higher more.

The distributor structure can be according to specific use occasion, select to have specification distributor now, for example Y type distribution, suitable structures such as T type distributor.

On the contrary, in the heating state, the high-temperature and high-pressure gaseous refrigerant compressed by the compressor 17 arranged in the outdoor unit 1 enters the four-way reversing valve 14 through the exhaust pipe of the compressor 17, at the moment, the coil of the four-way reversing valve 14 is electrified, the gaseous refrigerant flows out of the four-way reversing valve 14, flows into the communicated gas collecting header pipe 9 through the gas pipe stop valve 16, then is divided into 2 paths through the 1 st-stage gas-liquid pipe distributor 715, one path flows into the evaporator heat exchange pipe through the gas pipe of the evaporator of the first indoor unit 711, the air in the 1 st indoor space 71 is forced to flow through the surface of the evaporator heat exchange pipe of the first indoor unit 711 through the fan of the first indoor unit 711, at the moment, the refrigerant is condensed in the evaporator heat exchange pipe, releases heat to the air flowing through the surface of the evaporator heat exchange pipe, and circularly heats the air in the 1 st indoor space 71 to achieve the heating purpose, the condensed refrigerant turns into a high-pressure liquid refrigerant, reversely flows out of the liquid inlet pipe of the evaporator of the first indoor unit 711, reversely throttles by the 1 st electronic expansion valve 713, and finally flows into the 1 st stage liquid pipe distributor 714 through a liquid pipe.

The other path distributed by the 1 st level gas-liquid pipe distributor 715 continues to flow into the 2 nd level gas-liquid pipe distributor 725 through the next level gas pipe, is distributed by the 2 nd level gas-liquid pipe distributor 725, and is continuously divided into 2 paths, wherein one path flows into the evaporator heat exchange pipe through the gas pipe of the evaporator of the second indoor unit 721, and forces the air in the 2 nd indoor space 72 to flow through the surface of the evaporator heat exchange pipe of the second indoor unit 721 through the fan of the second indoor unit 721, at this time, the refrigerant is condensed in the evaporator heat exchange pipe, releases heat to the air flowing through the surface of the evaporator heat exchange pipe, circularly heats the air in the 2 nd indoor space 72 to achieve the heating purpose, and the condensed refrigerant becomes high pressure liquid refrigerant, reversely flows out of the liquid inlet pipe of the evaporator of the second indoor unit 721, and finally passes through the liquid pipe after reversely throttling by the 2 nd electronic expansion valve 723, flows into stage 2 tube distributor 724; the other path of distributed high-temperature and high-pressure gaseous refrigerant flows out of the 2 nd-stage gas-liquid pipe distributor 725, flows into the evaporator heat exchange pipe through the gas pipe of the evaporator of the third indoor unit 741, and is forced to flow through the surface of the evaporator heat exchange pipe of the third indoor unit 741 by the fan of the third indoor unit 741, at this time, the refrigerant condenses in the evaporator heat exchange pipe, releases heat to the air flowing through the surface of the evaporator heat exchange pipe, circularly heats the air in the 3 rd indoor unit 74 to achieve the heating purpose, and the condensed refrigerant becomes high-pressure liquid refrigerant, reversely flows out of the liquid inlet pipe of the evaporator of the third indoor unit 741, and finally flows into the 2 nd-stage liquid pipe distributor 724 through the liquid pipe after reversely throttling by the 3 rd electronic expansion valve 743.

The liquid refrigerants condensed by the second indoor unit 721 and the third indoor unit 741 are collected in the 2 nd level liquid pipe distributor 724, collected by the 2 nd level liquid pipe distributor 724, flow out of the 2 nd level liquid pipe distributor 724, then collected in the 1 st level gas-liquid pipe distributor 715 together with the liquid refrigerant condensed by the first indoor unit 711, collected by the 1 st level gas-liquid pipe distributor 715, flow out of the 1 st level gas-liquid pipe distributor 715, enter the communicated liquid collecting header 8, then enter the heat exchange tubes of the condenser 13 through the liquid pipe stop valve 15, pass through the rotation of the condensing fan 12 arranged at the top of the outdoor unit 1, and the outside air forcibly flows over the outer surfaces of the heat exchange tubes of the condenser 13, forcibly exchanges heat with the refrigerant in the heat exchange tubes of the condenser 13 through the external pressure of the condensing fan 12, and the refrigerant passing through the electronic stop valve evaporates and expands in the heat exchange tubes of the condenser 13, The air absorbs the heat of the outside air, becomes a low-pressure gas state, then enters the four-way reversing valve 14, passes through the four-way reversing valve 14, finally passes through the air suction pipe of the compressor, enters the compressor 17, and is circularly compressed.

The above embodiment is a mode in which one outdoor unit 1 pulls 3 indoor units, and if more indoor units are pulled or fewer than 3 indoor units are pulled, the control method is the same as the above principle, and the description is not repeated.

In this embodiment, the outdoor unit 1 adopts a top air outlet structure, and can achieve the purpose of normal use in a narrower outdoor space compared with a side air outlet structure; of course, a side air outlet structure may be adopted, for example, a structure of a common outdoor unit of a household air conditioner, and besides the top placement of the condenser 13, other suitable structures for ensuring that the outside air uniformly flows through the condenser may also be adopted, for example, a conventional structure may be adopted, such as being placed around the outdoor unit 1.

To solve the problem of reducing environmental pollution, it is preferable that the refrigerant flowing in the compressor 17 is an eco-friendly refrigerant.

Meanwhile, in order to further solve the purposes of being convenient to obtain, low in use cost and capable of improving energy efficiency on the basis of reducing pollution to the environment, the environment-friendly refrigerant is preferably R410 a.

Certainly, the environment-friendly refrigerant can be selected from other types of refrigerants according to actual use conditions, such as R290, carbon dioxide and other refrigerants, and compared with the environment-friendly refrigerant of R410a, the unit manufacturing and use cost is possibly higher; in addition to the environmentally friendly refrigerant, a non-environmentally friendly refrigerant such as R22 or the like may also be used.

Further, the image projector is a laser projector. The laser projector is used for constructing the pattern by using the laser beam, and the laser projector has the advantages of being convenient to obtain, low in use cost, accurate in image display and reliable in use due to the fact that the laser projector is mature in technology, reliable and large in scale.

Further, the compressor is a variable frequency compressor, and the outdoor unit fan motor and the indoor unit fan motor are direct current motors. Adopt inverter compressor, DC motor, can be according to different ability demands, through adjusting inverter compressor frequency, match the regulation ability to reach the effect that improves the efficiency, the noise reduction. In this embodiment, the compressor is a variable frequency compressor, and the outdoor unit fan motor and the indoor unit fan motor are direct current motors.

While the present invention has been described in considerable detail and with particular reference to a few illustrative embodiments thereof, it is not intended to be limited to any such details or embodiments or any particular embodiments, but rather it is to be construed that the invention effectively covers the intended scope of the invention by virtue of the prior art providing a broad interpretation of such claims in view of the appended claims. Furthermore, the foregoing describes the invention in terms of embodiments foreseen by the inventor for which an enabling description was available, notwithstanding that insubstantial modifications of the invention, not presently foreseen, may nonetheless represent equivalent modifications thereto.