1. A pipeline flow distribution system, comprising: the system comprises a main machine, a main pipeline and a plurality of branch pipelines; the main machine, the main pipeline, the branch pipelines and the range hoods are connected in sequence; a branch pipeline flow distribution valve is arranged between the branch pipeline and the main pipeline;

the host is used for determining a first impedance value corresponding to a target range hood under a preset air volume and adjusting the impedance value of each range hood in a starting state to be the first impedance value; the target range hood is the range hood which is farthest away from the host machine and is in a starting state;

the main machine is also used for adjusting the opening degree of each branch pipeline flow distribution valve;

the main engine is also used for determining the operating frequency of the main engine according to a preset power performance curve.

2. The pipe flow distribution system of claim 1, wherein each range hood is provided with a power distribution valve, the power distribution valve being in communication connection with the host;

the power distribution valve is used for acquiring a starting signal of the range hood, starting the power distribution valve based on the starting signal and reporting the starting signal to the host;

the host is also used for determining the range hood in a starting state based on the starting signal.

3. The pipe flow distribution system of claim 2, wherein the host is further configured to open a target branch pipe flow distribution valve; and the target branch pipeline corresponding to the target branch pipeline flow distribution valve comprises the range hood in a starting state.

4. The pipe flow distribution system of claim 2, further comprising: a first pressure sensor and a second pressure sensor; wherein the first pressure sensor is provided at an inlet side of the power distribution valve, and the second pressure sensor is provided at an outlet side of the power distribution valve;

the host is further used for obtaining an inlet side pressure value detected by the first pressure sensor and a public flue side pressure value detected by the second pressure sensor, and determining a corresponding first impedance value of the target range hood under a preset air volume based on the inlet side pressure value and the public flue side pressure value.

5. The pipe flow distribution system of claim 4, wherein the first impedance value is calculated by the following equation: Δ P ═ Pm-Ps; wherein Δ P is the first impedance value; pm is the side pressure value of the public flue; ps is the inlet side pressure value.

6. The pipeline flow distribution system of claim 1, wherein the host is further configured to determine a number of the range hoods in an on state in each of the branch pipelines, determine a total air volume of each of the branch pipelines based on the number of the range hoods, and adjust an opening degree of each of the branch pipeline flow distribution valves based on the total air volume of each of the branch pipelines.

7. The duct flow distribution system of claim 6, wherein the total air volume for each of the branch ducts is calculated by the following equation: q_ci＝N_i*Q_C(ii) a Wherein Q is_ciThe total air volume of the ith branch pipeline; n is a radical of_iThe number of the range hoods in the starting state in the ith branch pipeline is the number of the range hoods in the starting state in the ith branch pipeline; q_CThe preset air volume is adopted.

8. The pipe flow distribution system of claim 4, further comprising: a third pressure sensor; the third pressure sensor is arranged in the main pipeline;

the host is also used for acquiring a main pipeline pressure value detected by the third pressure sensor, calculating the impedance value of each branch pipeline based on the main pipeline pressure value and the public flue side pressure value of each branch pipeline, and determining the dynamic performance working air pressure based on the impedance value of each branch pipeline;

the host is also used for determining the total air exhaust volume of the system corresponding to the preset air volume, and the total air exhaust volume of the system and the working air pressure of the dynamic performance are determined according to a preset dynamic performance curve and the running frequency of the host.

9. The conduit flow distribution system of claim 8, wherein the impedance value of each of the branch conduits is calculated by the following equation: Δ Pci-Pz-Pm_i(ii) a Wherein, Δ Pci is the impedance value of the ith branch pipe; pz is the pressure value of the main pipeline; pm_iThe pressure value of the public flue side of the ith branch flue is taken as the pressure value of the public flue side of the ith branch flue;

calculating the working wind pressure of the dynamic performance by the following formula: p₀＝ΔP_i-n+ΔP_ci(ii) a Wherein, P₀Working wind pressure for the power performance; delta P_i-nThe impedance value of each range hood in the starting state is obtained; delta P_ciIs the maximum value of the impedance value of each branch pipe.

10. A central range hood system, comprising: a plurality of range hoods and the ducted flow distribution system of any of claims 1-9; the range hoods are connected with branch pipelines in the pipeline flow distribution system.

Background

At present, most of kitchen oil smoke discharged from residential buildings is discharged out of the roof through a single public flue, and generally, kitchen flues of each household on the same floor are mutually independent. Kitchen smoke can be discharged through the range hood or concentrated smoke discharge. Considering that most floors in old districts are less than or equal to 6 floors, a kitchen flue centralized smoke exhaust system adopting an all-in-one mode is generally adopted.

The existing kitchen flue centralized smoke exhaust system generally adopts a smoke exhaust mode of performing centralized extraction and flow balanced distribution on a residential public flue, and comprises a kitchen and bathroom integrated exhaust system and a scheme for purifying tail-end exhaust air by peculiar smell, wherein the scheme needs to be based on a theoretical algorithm and a related function relationship and aims at the kitchen and bathroom integrated system.

However, for kitchen flues in an old community in an all-in-one manner, the number of users started on each branch pipeline is not uniform, the total air volume demand of the branch pipelines is differentiated, the natural distribution of pipelines cannot reach a target value, the matching performance of the existing algorithm is poor, and the air volume distribution of each user is possibly uneven, so that the experience degree of the user is reduced. The existing scheme is suitable for independent flues, has poor matching performance to all-in-one flues and poor air distribution uniformity, and is difficult to meet the requirement of the air discharge of residents.

Disclosure of Invention

In view of this, the present invention provides a pipeline flow distribution system and a central range hood system to distribute air evenly, meet the requirement of the air discharge of the residents, and improve the experience of the users.

In a first aspect, an embodiment of the present invention provides a pipe flow distribution system, including: the system comprises a main machine, a main pipeline and a plurality of branch pipelines; the main machine, the main pipeline, the branch pipelines and the range hoods are connected in sequence; a branch pipeline flow distribution valve is arranged between the branch pipeline and the main pipeline; the host is used for determining a first impedance value corresponding to the target range hood under the preset air volume and adjusting the impedance value of each range hood in the starting state to be the first impedance value; the target range hood is a range hood which is farthest away from the host machine and is in a starting state; the main machine is also used for adjusting the opening of each branch pipeline flow distribution valve; the main machine is also used for determining the operating frequency of the main machine according to a preset power performance curve.

In a preferred embodiment of the present invention, each range hood is provided with a power distribution valve, and the power distribution valve is in communication connection with the host; the power distribution valve is used for acquiring a starting signal of the range hood, starting the power distribution valve based on the starting signal and reporting the starting signal to the host; the host computer is also used for determining the range hood in the starting state based on the starting signal.

In a preferred embodiment of the present invention, the host is further configured to open a target branch pipe flow distribution valve; and the target branch pipeline corresponding to the target branch pipeline flow distribution valve comprises the range hood in a starting state.

In a preferred embodiment of the present invention, the pipe flow distribution system further includes: a first pressure sensor and a second pressure sensor; wherein the first pressure sensor is arranged at the inlet side of the power distribution valve, and the second pressure sensor is arranged at the outlet side of the power distribution valve; the host is further used for obtaining an inlet side pressure value detected by the first pressure sensor and a public flue side pressure value detected by the second pressure sensor, and determining a corresponding first impedance value of the target range hood under the preset air volume based on the inlet side pressure value and the public flue side pressure value.

In a preferred embodiment of the present invention, the first impedance value is calculated by the following equation: Δ P ═ Pm-Ps; wherein Δ P is a first impedance value; pm is a side pressure value of the public flue; ps is the inlet side pressure value.

In a preferred embodiment of the present invention, the host is further configured to determine the number of range hoods in the branch ducts in the power-on state, determine the total air volume of each branch duct based on the number of range hoods, and adjust the opening of the flow distribution valve of each branch duct based on the total air volume of each branch duct.

In the preferred embodiment of the present invention, the total air volume of each branch duct is calculated by the following equation: q_ci＝N_i*Q_C(ii) a Wherein Q is_ciThe total air volume of the ith branch pipeline; n is a radical of_iThe number of the range hoods in the startup state in the ith branch pipeline is the number of the range hoods in the startup state in the ith branch pipeline; q_CTo presetAnd (4) air volume.

In a preferred embodiment of the present invention, the above pipe flow distribution system further includes: a third pressure sensor; the third pressure sensor is arranged in the main pipeline; the main machine is also used for acquiring a main pipeline pressure value detected by the third pressure sensor, calculating an impedance value of each branch pipeline based on the main pipeline pressure value and the public flue side pressure value of each branch pipeline, and determining dynamic performance working air pressure based on the impedance value of each branch pipeline; the main machine also determines the total air exhaust volume of the system corresponding to the preset air volume, and determines the operating frequency of the main machine according to the preset dynamic performance curve, the total air exhaust volume of the system and the working air pressure of the dynamic performance.

In the preferred embodiment of the present invention, the impedance value of each branch conduit is calculated by the following equation: Δ Pci-Pz-Pm_i(ii) a Wherein, Δ Pci is the impedance value of the ith branch pipe; pz is a pressure value of the main pipeline; pm_iThe pressure value of the public flue side of the ith branch flue is taken as the pressure value of the public flue side of the ith branch flue;

calculating the working wind pressure of the dynamic performance by the following formula: p₀＝ΔP_i-n+ΔP_ci(ii) a Wherein, P₀Working wind pressure for dynamic performance; delta P_i-nThe impedance value of each range hood in the starting state is obtained; delta P_ciIs the maximum value of the impedance value of each branch pipe.

In a second aspect, an embodiment of the present invention further provides a central extractor hood system, including: a plurality of range hoods and the pipeline flow distribution system; and the range hoods are connected with branch pipelines in the pipeline flow distribution system.

The embodiment of the invention has the following beneficial effects:

according to the pipeline flow distribution system and the central range hood system provided by the embodiment of the invention, the host can adjust the impedance value of each range hood in a starting state, adjust the opening degree of each branch pipeline flow distribution valve and determine the operating frequency of the host according to a preset power performance curve; the total flow of each branch pipeline can be distributed as required, the valve plate opening of each floor flow distribution valve is adjusted in real time, the balanced distribution of the air exhaust volume of each floor can be realized, the air exhaust volume requirement of residents is met, and the user experience is improved.

Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.

In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a pipeline flow distribution system according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another pipe flow distribution system according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of pipeline flow allocation according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a central extractor hood system according to an embodiment of the present invention.

Icon: 1-a host; 2-a main pipeline; 3-branch pipelines; 4-smoke exhaust ventilator; 5-a flow distribution valve; 6-a first pressure sensor; 7-a second pressure sensor; 8-a third pressure sensor; 9-power distribution valve.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

At present, the existing kitchen flue centralized smoke exhaust system generally adopts a smoke exhaust mode of performing centralized extraction and flow balanced distribution on a residential public flue. Aiming at kitchen flues in an old community in an all-in-one mode, the number of started users on each branch pipeline is not uniform, the total air volume requirements of the branch pipelines are differentiated, the natural distribution of pipelines cannot reach a target value, the matching performance of the existing algorithm is poor, and the air volume distribution of each user is possibly uneven, so that the experience degree of the user is reduced. The existing scheme is suitable for independent flues, has poor matching performance to all-in-one flues and poor air distribution uniformity, and is difficult to meet the requirement of the air discharge of residents.

Based on the above, the pipeline flow distribution system and the central range hood system provided by the embodiment of the invention are adapted to a distributed system and a centralized system, and can integrate and segment control the all-in-one kitchen smoke exhaust pipeline, so that the flow is uniformly distributed and the exhaust volume of each terminal is controlled through secondary control.

To facilitate understanding of the present embodiment, a detailed description will be given of a pipe flow distribution system disclosed in the present embodiment.

The first embodiment is as follows:

an embodiment of the present invention provides a pipeline flow distribution system, which is shown in fig. 1 and includes: the system comprises a main machine 1, a main pipeline 2 and a plurality of branch pipelines 3; the main machine 1, the main pipeline 2, the branch pipelines 3 and the range hoods 4 are connected in sequence; a branch pipeline flow distribution valve 5 is arranged between the branch pipeline 3 and the main pipeline 2;

the host is used for determining a first impedance value corresponding to the target range hood under the preset air volume and adjusting the impedance value of each range hood in the starting state to be the first impedance value; the target range hood is a range hood which is farthest away from the host machine and is in a starting state; the main machine is also used for adjusting the opening of each branch pipeline flow distribution valve; the main machine is also used for determining the operating frequency of the main machine according to a preset power performance curve.

The pipeline flow distribution system provided by the embodiment can be applied to a central range hood, the host can be installed at the outlet of a common flue of a house roof to assist in smoke exhaust of oil smoke in the common flue, and equipment of a fan can be contained in the host. The range hood can also be called as terminal equipment, and the terminal part and the host machine are communicated in a wired and wireless mode, and the range hood is used for controlling a plurality of kitchens and smoke exhaust which exhaust smoke through an all-in-one flue.

The host computer can provide power for pipeline flow distribution system, and pipeline flow distribution system generally includes 1 trunk line, and 1 trunk line can correspond a plurality of small transfer lines, and 1 small transfer line can correspond a plurality of lampblack absorber, and 1 small transfer line generally corresponds 1 small transfer line flow distribution valve, and 1 lampblack absorber generally corresponds 1 small transfer line flow distribution valve.

The branch pipeline flow distribution valve can control the total flow of each branch common exhaust passage, the host can adjust the impedance value of each range hood in the starting state to be the first impedance value corresponding to the target range hood under the preset air volume, the range hoods in the starting state can be ensured to have the same impedance value, and the range hoods in the starting state can be ensured to have the same flow distribution.

The host can also adjust the opening degree of the total flow distribution valve on each branch pipeline, and adjust the total flow on each branch pipeline by adjusting the opening degree to distribute the flow of each branch pipeline according to the requirement.

The host may also determine a host operating point (P)₀,Q₀) Determining the operating point (P) of the main engine from a predetermined dynamic performance curve₀,Q₀) And the corresponding operating frequency is used as the operating frequency of the host. Wherein, P₀Working wind pressure, Q, for dynamic performance₀And distributing the total exhaust air volume of the system for the pipeline flow.

According to the pipeline flow distribution system provided by the embodiment of the invention, the host can adjust the impedance value of each range hood in a starting state, adjust the opening of each branch pipeline flow distribution valve and determine the operating frequency of the host according to a preset power performance curve; the total flow of each branch pipeline can be distributed as required, the valve plate opening of each floor flow distribution valve is adjusted in real time, the balanced distribution of the air exhaust volume of each floor can be realized, the air exhaust volume requirement of residents is met, and the user experience is improved.

Example two:

the embodiment of the invention provides another pipeline flow distribution system, which is shown in a schematic structural diagram of the other pipeline flow distribution system shown in fig. 2, wherein each range hood is provided with a power distribution valve 9, and the power distribution valves 9 are in communication connection with a host; the power distribution valve is used for acquiring a starting signal of the range hood, starting the power distribution valve based on the starting signal and reporting the starting signal to the host; the host computer is also used for determining the range hood in the starting state based on the starting signal.

The power distribution valve is positioned at the tail end of the air pipe of the range hood, is close to the joint of the common exhaust passage and is used for adjusting the exhaust volume of kitchens on each floor. The kitchen flow distribution valve is connected with the range hood, when the range hood is started, the flow distribution valve obtains a starting signal and sends the starting signal to the roof host, and meanwhile, the branch pipeline total flow distribution valve F_iStarting, opening a kitchen power distribution valve, and detecting pressure by a pressure sensor; the branch pipeline total flow distribution valve, the kitchen power distribution valve, the pressure sensor and the roof host machine are communicated in real time in a wired or wireless communication mode.

Specifically, the host is also used for opening a target branch pipeline flow distribution valve; and the target branch pipeline corresponding to the target branch pipeline flow distribution valve comprises the range hood in a starting state. When the range hood is started, the kitchen flow distribution valve detects a starting signal of the range hood and sends the starting signal to the roof host, and the host judges which branch pipeline C the starting signal comes from_iI.e., the target branch pipe, and then opens the corresponding target branch pipe flow distribution valve (opening 1).

As shown in fig. 2, the pipe flow distribution system further includes: a first pressure sensor 6 and a second pressure sensor 7; wherein the first pressure sensor is arranged at the inlet side of the power distribution valve (in the kitchen smoke exhaust duct), and the second pressure sensor is arranged at the outlet side of the power distribution valve (in the public flue).

The host can determine the impedance value of each range hood in the starting state after the target branch pipeline flow distribution valve is opened, the host is further used for obtaining an inlet side pressure value detected by the first pressure sensor and a public flue side pressure value detected by the second pressure sensor, and a first impedance value corresponding to the target range hood under the preset air volume is determined based on the inlet side pressure value and the public flue side pressure value.

Specifically, the first impedance value is calculated by the following equation: Δ P ═ Pm-Ps; wherein Δ P is a first impedance value; pm is a side pressure value of the public flue; ps is the inlet side pressure value.

The host can count the starting number N of each branch pipeline_iAnd detecting the extractor hood C which is started furthest from the host in the system_i-nAnd opens its corresponding power distribution valve angle (opening 1). Then, detecting an inlet side pressure value Ps and a public flue side pressure value Pm through a pressure sensor according to the system working condition, and calculating a range hood X farthest from the host machine_i-nAt a preset air quantity Q_cThe required impedance delta P ═ Pm-Ps, and the impedance value delta P of the range hood in each starting state is adjusted according to the flow impedance relation P ^ Q_i-nEqual to delta P, namely ensuring the impedance relation delta P of all the cigarette machines_i-nAnd delta P can ensure that the flow distribution of each range hood is equal.

The host computer can also adjust the opening degree of the total flow distribution valve on each branch pipeline, is also used for determining the number of the range hoods in the starting state in each branch pipeline, determines the total air volume of each branch pipeline based on the number of the range hoods, and adjusts the opening degree of the flow distribution valve of each branch pipeline based on the total air volume of each branch pipeline.

Specifically, the total air volume of each branch duct can be calculated by the following equation: q_ci＝N_i*Q_C(ii) a Wherein Q is_ciThe total air volume of the ith branch pipeline; n is a radical of_iThe number of the range hoods in the startup state in the ith branch pipeline is the number of the range hoods in the startup state in the ith branch pipeline; q_CIs a preset air quantity. The host computer starts the machine according to the number N of the branch pipelines_iTo obtain the total air quantity Q required by each branch pipeline_ci＝N_i*Q_CAdjusting the opening theta of the total flow distribution valve on each branch pipe_ci。

As shown in fig. 2, the pipe flow distribution system further includes: a third pressure sensor 8; the third pressure sensor is arranged in the main pipeline. The main machine is also used for acquiring a main pipeline pressure value detected by the third pressure sensor, calculating an impedance value of each branch pipeline based on the main pipeline pressure value and the public flue side pressure value of each branch pipeline, and determining dynamic performance working air pressure based on the impedance value of each branch pipeline; the main machine also determines the total air exhaust volume of the system corresponding to the preset air volume, and determines the operating frequency of the main machine according to the preset dynamic performance curve, the total air exhaust volume of the system and the working air pressure of the dynamic performance.

Specifically, the impedance value of each branch pipe can be calculated by the following equation: Δ Pci-Pz-Pm_i(ii) a Wherein, Δ Pci is the impedance value of the ith branch pipe; pz is a pressure value of the main pipeline; pm_iIs the common flue side pressure value of the ith branch flue.

Specifically, the dynamic performance working wind pressure may be calculated by the following equation: p₀＝ΔP_i-n+ΔP_ci(ii) a Wherein, P₀Working wind pressure for dynamic performance; delta P_i-nThe impedance value of each range hood in the starting state is obtained; delta P_ciIs the maximum value of the impedance value of each branch pipe.

The host machine can respectively acquire corresponding wind pressures Pz and Pm through the third pressure sensor and the second pressure sensor_iCalculating the required air quantity Q_ciLower impedance value delta Pci-Pz-Pm_iAnd the ratio satisfies the distribution relation of the flow impedance of the all-in-one pipelineSince Pz is the same, the branch duct Δ Pci having a low air volume demand ratio is larger.

The host operating point (P) of the system can then be determined₀,Q₀): taking the large value of delta Pci, calculating the value P₀＝ΔP_i-n+ΔP_ciWorking wind pressure P as dynamic property₀(ii) a Calculating the total exhaust air quantity Q of the system according to the total startup number N of the system₀＝N*Q_C. When learning the host operating point (P)₀,Q₀) Then, the operation is performed according to each frequency of the hostDetermining the actual operating frequency R of the main engine₀。

The overall flow of distributing the pipeline flow in this embodiment may refer to a flow diagram of distributing the pipeline flow shown in fig. 3, where the flow diagram includes:

firstly, detecting whether a starting signal exists in a kitchen range hood; if not, closing a main control valve of the kitchen air quantity; if yes, judging the branch pipeline C from which the starting signal comes_i. Then opening all branch pipeline flow master control valves F in the starting state_i(opening degree 1), detecting the range hood C in the starting state in the detection system_i-nAnd opening all the range hoods C in the starting state_i-nThe power distribution valve (opening 1). Range hood X capable of being started in identification and detection system and farthest from host_i-nAnd corresponding wind pressures Pm and Ps are obtained through real-time monitoring of the pressure sensor, and the set wind quantity Q of the corresponding wind pressures Pm and Ps is calculated_cThe lower impedance value delta P is Pm-Ps; adjust range hood C under each start-up state_i-nOpening degree of the power distribution valve of (1) to make the impedance value delta P corresponding to each user_i-nAnd the flow distribution of each range hood can be ensured to be equal to delta P.

Finally, according to the number of the start-up machines on each branch pipeline, the total air quantity Q required by each branch pipeline is obtained_ciAdjusting the opening theta of the total flow distribution valve on each branch pipe_ciAcquiring corresponding wind pressures Pz and Pm through a pressure sensor_iCalculating the required air quantity Q_ciImpedance value delta Pci-Pz-Pm_iAnd the ratio satisfies the distribution relation of the flow impedance of the all-in-one pipelineSo that the total flow of each branch pipeline meets the requirement. Monitor calculated value P ═ Δ P_i-n+ΔP_ciWorking wind pressure P as dynamic property₀And simultaneously, the total air exhaust quantity Q is calculated according to the total starting number₀. Determining the actual operating frequency R of the main engine according to the power performance curve of the main engine during the operation of each frequency₀。

The pipeline flow distribution system provided by the embodiment adopts an all-in-one flue system framework and a corresponding flow control mode, and determines the system working point by detecting the starting number, the starting floor, the oil fume suction power performance and the sensor pressure monitoring value of a kitchen fume exhaust system, so as to determine the host operating frequency. The total flow of each branch pipeline can be distributed as required, the valve plate opening of each floor flow distribution valve is adjusted in real time, the balanced distribution of the air exhaust volume of each floor can be realized, the air exhaust volume requirement of residents is met, the experience degree of users is improved, and the balanced distribution of the air exhaust volume of each floor is realized. And flow distribution on demand is realized for each branch pipeline, and flow balanced distribution is realized for each floor kitchen.

Example three:

the embodiment of the invention provides a central range hood system, which is shown in a structural schematic diagram of the central range hood system shown in fig. 4 and comprises the following components: a plurality of range hoods and the pipeline flow distribution system; and the range hoods are connected with branch pipelines in the pipeline flow distribution system.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the central range hood system described above may refer to the corresponding process in the foregoing embodiments, and will not be described herein again.

In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the following embodiments are merely illustrative of the present invention, and not restrictive, and the scope of the present invention is not limited thereto: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.