1. A temperature control system for an air filtering manifold assembly, the temperature control system comprising a sensor, a controller, an actuator, and a heating device, and the sensor is in communication with the controller, the controller is in communication with the actuator, and the actuator is in communication with the heating device; wherein the content of the first and second substances,

the sensor is used for detecting the gas in the air filtering gas pipe of the air filtering gas pipe assembly to obtain and feed back gas temperature information and flow information to the controller;

the controller sends a control signal to the actuator according to the gas temperature information and the flow information, and the actuator controls the heating device to operate according to the received control signal; and the number of the first and second electrodes,

when the gas temperature information is lower than a temperature threshold value, the controller sends heating power required by the heating device to heat to the temperature threshold value within a heating time limit to the actuator, and the actuator controls the heating device to operate at the heating power;

when the gas temperature information is higher than the temperature threshold value, the controller stops sending the control signal to the actuator, and the heating device stops running.

2. The temperature control system of claim 1, wherein the heating time period is 0.3s to 1.5 s.

3. An air filtering trachea assembly, comprising an air filtering trachea, wherein the peripheral wall of the air filtering trachea is provided with a breathing tube interface, and the breathing tube interface is communicated with a pipeline inside the air filtering trachea, and the air filtering trachea assembly is characterized by further comprising a temperature control system according to claim 1 or 2; wherein the content of the first and second substances,

the heating device is arranged in the pipeline of the air filtering trachea and is positioned at the upstream of the breathing tube interface;

the sensor of the temperature control system is arranged on the air filter trachea and extends into the pipeline, and the sensor is positioned between the heating device and the breathing tube interface in the extending direction of the pipeline.

4. The air filtering tracheal assembly of claim 3, wherein the sensor simultaneously detects the gas temperature information of the gas heated by the heating device and the gas temperature information of the gas flowing through the breathing tube interface.

5. An air filtering tracheal assembly according to claim 3 wherein the sensor is intermediate the heating device and the breathing tube interface in the direction of extension of the tubing.

6. The air filtering tracheal assembly of claim 5, wherein the sensor is located 30mm to 150mm from the heating device and the sensor is located 30mm to 150mm from the respiratory tubing interface.

7. An air filtering draft tube assembly according to claim 3, wherein a rectifying grating is provided within said conduit, said rectifying grating being located between said heating device and said sensor in the direction of extension of said conduit.

8. The air filtering draft tube assembly according to claim 3, wherein said heating means comprises a heating wire, said heating wire being arranged in a helical configuration.

9. The air filtering air pipe assembly according to claim 8, wherein the heating device further comprises a housing, the housing is disposed in the pipeline and is coaxial with the pipeline at a corresponding position, the housing forms an inner cavity, two ends of the housing along an axial direction of the housing are provided with through openings, the openings communicate the inner cavity and the pipeline, and the heating wire is accommodated in the inner cavity; and is

The shell is made of high-temperature resistant materials.

10. The air filtering draft tube assembly according to claim 9, wherein an inner wall surface of said housing is provided with a heat collecting layer.

11. The air filtering air pipe assembly according to claim 10, wherein both ends of the heating wire pass through a sidewall of the housing and extend to an outside of the air filtering air pipe; and is

The two ends of the heating wire are provided with heating wire joints, and the heating wire joints are made of heat insulation and conductive materials.

12. An engine comprising an engine block having an engine throttle valve disposed thereon, characterized in that the engine further comprises an air filter air duct assembly according to claims 3-11, the air filter air duct of the air filter air duct assembly being connected to and communicating with the engine throttle valve.

Background

In order to solve the problem that the respiratory tube freezes under the extremely cold condition, the current technical scheme is to wrap up the heat preservation cotton on the respiratory tube, be assisted with respiratory tube joint reaming scheme. However, this solution does not solve this problem well.

Disclosure of Invention

The invention aims to solve the problems that the temperature of gas in an air filtering trachea can not be controlled quickly and accurately and the freezing of a breathing tube on the air filtering trachea in the prior art. First, the present invention provides a temperature control system, which can achieve the effect of rapidly and accurately controlling the temperature of the gas inside the air filtering pipe by detecting the flow rate and temperature of the gas and controlling the heating power accordingly. Secondly, provide an empty trachea assembly that filters, through using above-mentioned temperature control system cooperation heating device, the gas temperature at the quick adjustment respiratory tube kneck ensures not to appear the problem of freezing.

In order to solve the technical problem, the invention provides a temperature control system, which is used for an air filtering air pipe assembly and comprises a sensor, a controller, an actuator and a heating device, wherein the sensor is in communication connection with the controller; the sensor is used for detecting gas in an air filtering gas pipe of the air filtering gas pipe assembly to obtain and feed back gas temperature information and flow information to the controller; the controller sends a control signal to the actuator according to the gas temperature information and the flow information, and the actuator controls the heating device to operate according to the received control signal; when the gas temperature information is lower than the temperature threshold, the controller sends heating power required by the heating device to heat to the temperature threshold within the heating time limit to the actuator, and the actuator controls the heating device to operate at the heating power; and when the gas temperature information is higher than the temperature threshold value, the controller stops sending the control signal to the actuator, and the heating device stops running.

By adopting the scheme, the sensor detects the gas temperature information and the flow information in front of the breathing tube interface in real time and compares the gas temperature information and the flow information with the temperature threshold value. If the temperature is lower than the temperature threshold value, the controller combines the flow information and calculates the heating power required by heating to the temperature threshold value within a certain time through logic, and converts the heating power into a control signal to be transmitted to the actuator. The actuator controls the heating device to perform heating work according to the control signal; if the temperature is higher than the temperature threshold value, the control signal output to the heating device is suspended, so that the heating of the air flow is stopped. Through the temperature control system, the temperature of the air flow of the air filtering tracheal breathing tube interface is adjusted, and the effect of quickly and accurately controlling the temperature of the air in the air filtering tracheal breathing tube is achieved, so that the air flowing through the heating wire is heated to an ideal temperature.

According to another embodiment of the present invention, the temperature control system disclosed in the embodiment of the present invention has a heating time limit of 0.3s to 1.5 s.

With the above scheme, the gas flowing through is heated to the ideal temperature in the time which can be 0.3s, 0.5s or 1.5s, and the temperature is monitored in real time by the sensor, so that the temperature can be adjusted rapidly in the range.

The air filtering trachea assembly is characterized by further comprising the temperature control system; wherein, the heating device is arranged in the pipeline of the air filtering trachea and is positioned at the upstream of the breathing tube interface; the sensor of the temperature control system is arranged on the air filter trachea and extends into the pipeline, and the sensor is positioned between the heating device and the breathing pipe interface in the extending direction of the pipeline.

By adopting the scheme, the air filtering air pipe enters from the air inlet port and flows to the heating device through the front section pipeline, after being heated, the air further flows to the sensor to be detected, and then further flows through the breathing pipe port, and the air at the moment is heated air. And because the temperature control system can actively control the heating device according to the temperature and flow information of the flowing gas, the heating device can be timely, quickly and accurately controlled to heat, so that the temperature of the gas flowing through the upstream is kept below a temperature threshold value, and the respiratory tube is prevented from being frozen.

According to another embodiment of the present invention, the air filtering tracheal tube assembly is disclosed, wherein the sensor simultaneously detects the gas temperature information of the gas heated by the heating device and the gas temperature information of the gas flowing through the interface of the respiratory tube.

Adopt above-mentioned scheme, the sensor detects the temperature of the gas after being heated by heating device and the gas temperature who flows through respiratory tube kneck simultaneously, carries out the temperature and compares, confirms the calorific loss of gas flow in-process to this feeds back to the treater, carries out heating device's power adjustment, thereby calculates the required actual heating power of heating device when respiratory tube does not freeze more accurately, realizes the accurate control of respiratory tube kneck temperature. For example, the gas heated by the heating device has temperature loss when flowing to the interface of the breathing tube, and the actually required heating power can be obtained through logical calculation through the temperature detection of the two positions.

According to another embodiment of the present invention, an air filtering tracheal tube assembly is disclosed, wherein the sensor is located intermediate the heating device and the breathing tube interface in the direction of extension of the tubing.

By adopting the scheme, the temperature of the gas heated by the heating device and the temperature of the gas flowing through the interface of the breathing tube can be monitored simultaneously by arranging the heating device and the interface of the breathing tube.

According to another embodiment of the invention, the air filtering tracheal tube assembly is disclosed, wherein the distance between the sensor and the heating device is 30mm-150mm, and the distance between the sensor and the respiratory tube interface is 30mm-150 mm.

According to another embodiment of the present invention, the air filtering air pipe assembly is disclosed in which a rectifying grille is disposed in the pipeline, and the rectifying grille is located between the heating device and the sensor in the extending direction of the pipeline.

By adopting the scheme, the rectifying grating is a hard separating body in a honeycomb or network shape. The gas has stronger disturbance airflow in a short distance when meeting a heating device or just entering an air filtering gas pipe, a certain vortex area can be formed, the airflow speed on the section of the pipe section is irregularly distributed, and therefore the accuracy of the gas flow (air volume) test is difficult to guarantee. When the flow-regulating grille is used, the disturbed airflow after the airflow flows through can be reduced, and the accuracy of flow information is improved.

According to another embodiment of the present invention, the air filtering trachea assembly is disclosed, wherein the heating device comprises a heating wire, and the heating wire is arranged in a spiral structure.

By adopting the scheme, after the air flow flows through the heating wire of the heating device, the air flow is uniformly heated, and meanwhile, the influence on pressure loss caused by disturbance generated on the air flow is avoided as much as possible.

According to another specific embodiment of the present invention, the air filtering air pipe assembly disclosed in the embodiment of the present invention further comprises a housing, the housing is disposed in the pipeline and is coaxially disposed with the pipeline at the corresponding position, the housing forms an inner cavity, two ends of the housing along the axial direction of the housing are provided with through openings, the openings communicate the inner cavity and the pipeline, and the heating wire is accommodated in the inner cavity; and the material of the shell is high-temperature resistant material.

By adopting the scheme, the shell plays a role in protecting the air filtering air pipe from being damaged by the electric heating wire.

According to another specific embodiment of the present invention, the air filtering pipe assembly disclosed in the embodiment of the present invention, the inner wall surface of the casing is provided with a heat collecting layer.

Adopt above-mentioned scheme, in order to strengthen the heat transfer effect here, avoid the heating wire to lead to the fact the heat damage to the inner wall of air filtering trachea and casing simultaneously, the casing inner wall increases can set up the heat collection layer of tin foil paper, reflection of light coating film for example.

According to another specific embodiment of the present invention, in the air filtering air pipe assembly disclosed in the embodiments of the present invention, two ends of the heating wire penetrate through the side wall of the housing and extend to the outside of the air filtering air pipe; and the two ends of the electric heating wire are provided with electric heating wire joints which are made of heat insulation and conductive materials.

By adopting the scheme, the plastic shell can be protected from being damaged by arranging the heat-insulating and heat-conducting material at the contact part of the electric heating wire and the shell.

Still provide an engine, including the engine body, be provided with the engine throttle on the engine body, still include above-mentioned empty gas pipe assembly that filters, empty gas pipe assembly that filters is connected and is communicate with the engine throttle.

By adopting the scheme, the air filtering air pipe assembly is installed on the engine, the air temperature at the interface of the breathing pipe is adjusted, the freezing of the breathing pipe is avoided, and the service life of the engine is prolonged.

The invention has the beneficial effects that:

first, the present invention provides a temperature control system, which can achieve the effect of rapidly and accurately controlling the temperature of the gas inside the air filtering pipe by detecting the flow rate and temperature of the gas and controlling the heating power accordingly. Secondly, provide an empty trachea assembly that filters, through using above-mentioned temperature control system cooperation heating device, the gas temperature at the quick adjustment respiratory tube kneck ensures not to appear the problem of freezing.

Drawings

Fig. 1 is a system block diagram of a temperature control system according to embodiment 1 of the present invention;

FIG. 2 is a schematic structural view of an air filtering air pipe assembly in embodiment 2 of the present invention;

FIG. 3 is a schematic structural view of the heating apparatus for an air filtering pipe assembly according to embodiment 2 of the present invention without a housing;

FIG. 4 is a schematic structural view of a heating apparatus of an air filtering air pipe assembly according to embodiment 2 of the present invention, which includes a housing;

fig. 5 is a schematic structural view of an engine in embodiment 3 of the invention.

Description of reference numerals:

10: a temperature control system;

110: a sensor; 120: a controller; 130: an actuator;

140: a heating device; 141: an electric heating wire; 1411: a heating wire joint;

142: a housing; 1421: an inner cavity; 1422: and a heat collecting layer.

20: air filtering out the air pipe; 210: a pipeline; 211: an air inlet port; 212: an air outlet port; 30: a breathing tube interface; 40: a rectifying grid.

1: an engine body; 2: filtering out the air pipe assembly; 3: an engine throttle.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention.

The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable 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 meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

In order to solve the above technical problem, as shown in fig. 1, the present invention provides a temperature control system 10 for an air filtering air pipe assembly, where the temperature control system 10 includes a sensor 110, a controller 120, an actuator 130, and a heating device 140, and the sensor 110 is in communication connection with the controller 120, the controller 120 is in communication connection with the actuator 130, and the actuator 130 is in communication connection with the heating device 140; the sensor 110 is configured to detect the gas in the filtered air pipe 20 of the filtered air pipe assembly, and obtain and feed back gas temperature information and flow information to the controller 120; the controller 120 sends a control signal to the actuator 130 according to the gas temperature information and the flow rate information, and the actuator 130 controls the heating device 140 to operate according to the received control signal; and, when the gas temperature information is lower than the temperature threshold, the controller 120 transmits the heating power required for the heating device 140 to heat to the temperature threshold within the heating time period to the actuator 130, and the actuator 130 controls the heating device 140 to operate at the heating power; when the gas temperature information is higher than the temperature threshold, the controller 120 stops sending the control signal to the actuator 130, and the heating device 140 stops operating.

Specifically, as shown in fig. 1, the sensor 110 detects the gas temperature information and flow information before the breathing tube mouthpiece, and compares them to a temperature threshold. If the temperature is lower than the temperature threshold, the controller 120 combines the flow information and calculates the heating power required to heat to the temperature threshold within a certain time through logic, and converts the heating power into a control signal to be transmitted to the actuator 130. The actuator 130 controls the heating device 140 to perform heating operation according to the control signal; if the temperature is higher than the temperature threshold, the control signal output to the heating device 140 is suspended, so as to stop heating the air flow. By means of the temperature control system 10, the temperature of the airflow at the breathing tube interface of the air filtering trachea 20 is adjusted, and the effect of quickly and accurately controlling the temperature of the air inside the air filtering trachea 20 is achieved.

More specifically, the temperature control system 10 is also electrically connected to a necessary power supply, which may be an external power supply, and in the present embodiment, the temperature control system 10 is electrically connected to an external vehicle-mounted power supply.

The heating device 140 may be a heating wire, an electric heating tube or other heating devices commonly used in the art.

It should be understood that the hardware used for the sensor 110, the controller 120, and the actuator 130 is a device commonly used in the art, and the present embodiment is not limited thereto.

In a preferred embodiment, the heating time period is from 0.3s to 1.5 s.

Specifically, the heating time period refers to the time during which the gas flowing through the heating device 140 is heated to a desired temperature. The heating time period may be any time within the range, and may be selected by those skilled in the art according to actual needs, and the embodiment is not particularly limited herein. For example 0.3s, 0.9s or 1.5 s.

Preferably, the heating time period is 0.5 s.

Example 2

Providing an air filtering trachea assembly, as shown in fig. 2, comprising an air filtering trachea 20, wherein a breathing tube interface 30 is arranged on the peripheral wall of the air filtering trachea 20, the breathing tube interface 30 is communicated with a pipeline 210 inside the air filtering trachea 20, and the air filtering trachea assembly further comprises a temperature control system 10 in embodiment 1; wherein the heating device 140 is disposed in the conduit 210 of the filtered air tube 20 upstream of the breathing tube mouthpiece 30; the sensor 110 of the temperature control system 10 is disposed on the filtered air tube 20 and extends into the conduit 210, and the sensor 110 is located between the heating device 140 and the breathing tube mouthpiece 30 in the direction of extension of the conduit 210.

Specifically, as shown in fig. 2, in the present embodiment, when the air in the air filtering air tube 20 enters the air filtering air tube 20, the air enters the air inlet port 211, passes through the front-stage pipeline 210, the heating device 140 of the temperature control system 10, the sensor 110, the breathing tube interface 30, and then exits from the air outlet port 212 through the rear-stage pipeline 210. Here, "upstream" means that the gas passes through the former portion in the process of flowing in the above-mentioned process, for example, the former-stage pipeline 210 is upstream of the heating device 140, and the sensor 110 is upstream of the breathing tube connector 30.

More specifically, the breathing tube interface 30 is disposed on the filtered air tube 20, and the temperature control system 10 is integrated on the filtered air tube 20 in order to quickly and efficiently solve the freezing problem of the breathing tube on the filtered air tube 20. The air filtering air pipe 20 is provided with a sensor 110, a controller 120, an actuator 130, and a power supply connection socket necessary for the heating device 140, and a space required for the integrated temperature control system 10.

For example, as shown in fig. 2, the peripheral wall of the filtered air pipe 20 is provided with an installation space, and in order to avoid the influence of the dirty air on the sensor 110 of the temperature control system 10, the sensor 110 is installed inside the filtered air pipe 20 and extends to the plug-in part located on the peripheral wall (the controller 120 and the actuator 130 are not shown in fig. 2).

The heating device 140 may be a heating wire, an electric heating tube, or other heating devices commonly used in the art. It should be understood that, in order for the heating device 140 not to interfere with the passage of air in the air filtering pipe assembly, the structural arrangement of the heating device 140 should not be too dense when it is a heating wire or an electric heating pipe.

In use, the filtered air tube 20 is heated by air entering from the inlet port and passing through the front-end tube 210 to the heating device 140, and then further flows to the sensor 110 for detection, and further flows through the breathing tube port 30, where the heated air is the air. In addition, the temperature control system 10 can actively control the heating device 140 according to the temperature and flow information of the flowing gas, so that the heating device 140 can be timely, quickly and accurately controlled to heat, the temperature of the flowing gas at the upstream is guaranteed to be kept below the temperature threshold, and the respiratory tube is prevented from being frozen.

In a preferred embodiment, the sensor 110 detects both the gas temperature information of the gas heated by the heating device 140 and the gas temperature information of the gas flowing through the breathing tube interface 30.

Specifically, the temperature control system 10 simultaneously monitors the heated air temperature and the air temperature flowing through the breathing tube interface 30, and for this purpose, the sensor 110 may be configured to have a width of the sensor 110 in the axial direction of the filtered air tube 20 as shown in fig. 2, so that the sensor 110 can simultaneously detect the air temperature on both sides at the same time. It may also be the effect of monitoring both the heated air temperature and the temperature of the gas flowing through the breathing tube interface 30 through specific location settings.

When the device is used, the sensor 110 detects the temperature of the gas heated by the heating device 140 and the temperature of the gas flowing through the breathing tube interface 30 at the same time, compares the temperatures, determines the heat loss in the gas flowing process, feeds the heat loss back to the processor, adjusts the power of the heating device, and can more accurately calculate the actual heating power required by the heating device 140 when the breathing tube is not frozen. For example, the gas heated by the heating device 140 may have a temperature loss when flowing to the breathing tube interface 30, and the actual required heating power can be obtained through logic calculation through temperature detection at two positions.

In a preferred embodiment, as shown in fig. 2, sensor 110 is located intermediate heating device 140 and breathing tube interface 30 in the direction of extension of tubing 210.

With the above arrangement, the gas heated by the heating device 140 and the gas flowing through the breathing tube interface 30 can be monitored simultaneously by being disposed between the heating device 140 and the breathing tube interface 30.

In a preferred embodiment, the sensor 110 is located 30mm to 150mm from the heating device 140 and the sensor 110 is located 30mm to 150mm from the breathing tube interface 30.

Specifically, the allowable distance range is 30mm to 150mm, for example, 30mm or 150mm or 90mm, and those skilled in the art can select the distance range according to actual needs, and the embodiment is not particularly limited herein.

Wherein preferably the sensor 110 is 50mm from the heating device 140 and the sensor 110 is 50mm from the breathing tube interface 30.

In a preferred embodiment, as shown in fig. 2, a flow straightener 40 is arranged in the line 210, the flow straightener 40 being located between the heating device 140 and the sensor 110 in the direction of extension of the line 210.

In particular, the fairing grating 40 is a rigid separator in the form of a honeycomb or mesh. The gas has strong disturbance airflow in a short distance when meeting the heating device 140 or just entering the air filtering air pipe 20, a certain vortex area can be formed, so that the airflow speed on the section of the pipe section is irregularly distributed, and the accuracy of the gas flow (air volume) test is difficult to ensure.

When the flow regulating grille 40 is used, the disturbed airflow after the airflow flows through can be reduced, and the accuracy of flow information is improved.

In a preferred embodiment, as shown in fig. 3-4, the heating device 140 includes heating wires 141, and the heating wires 141 are arranged in a helical structure.

Specifically, the plane in which the heating wire 141 is spirally wound is perpendicular to the axial direction of the air filtering air pipe 20. For example, the heating wire 141 may be made of a nichrome material having a diameter of 3 mm.

By adopting the above scheme, after the air flow flows through the heating wires 141 of the heating device 140, the air flow is uniformly heated, and meanwhile, the pressure loss is prevented from being influenced by disturbance generated to the air flow flowing through as much as possible.

In a preferred embodiment, as shown in fig. 4, the heating device 140 further includes a housing 142, the housing 142 is disposed in the pipeline 210 and is disposed coaxially with the pipeline 210 at a corresponding position, the housing 142 forms an inner cavity 1421, two ends of the housing 142 along an axial direction of the housing 142 are provided with through openings, the openings communicate the inner cavity 1421 with the pipeline 210, and the heating wire 141 is accommodated in the inner cavity 1421; and the material of the housing 142 is a high temperature resistant material.

Specifically, the housing 142 serves to protect the air filtering duct 20 from being damaged by the heating wire 141. For example, the shell 142 is made of PA6-GF30 or other high temperature resistant materials, and the wall thickness can be 2.5 mm.

More specifically, the specific structure of the housing 142 is as shown in fig. 4, and the housing 142 is further provided with a necessary insertion portion in which the electric connection end of the heating wire 141 is located, passing through the air filtering air tube 20 at the outside of the air filtering air tube 20.

In a preferred embodiment, as shown in FIG. 4, the inner wall surface of the housing 142 is provided with a heat collecting layer 1422.

By adopting the above scheme, in order to enhance the heat exchange effect and prevent the heating wire 141 from causing heat damage to the inner walls of the air filtering air pipe 20 and the shell 142, the inner wall of the shell 142 is additionally provided with a heat collecting layer which can be provided with tinfoil paper and a reflective coating film.

In a preferred embodiment, as shown in fig. 2, both ends of the heating wire 141 pass through the sidewall of the housing 142 and extend to the outside of the air filtering duct 20; and both ends of the heating wire 141 are provided with heating wire joints 1411, and the heating wire joints 1411 are made of a heat insulating and conductive material.

In particular, the thermally and electrically insulating material may be a copper wire.

When in use, the heat-insulating and heat-conducting material is arranged at the contact part of the heating wire 141 and the shell 142, so that the plastic shell can be protected from being damaged.

Example 3

As shown in fig. 5, the engine further comprises an engine body 1, an engine throttle 3 is arranged on the engine body 1, the air filtering air pipe assembly 2 is further included, and an air filtering air pipe 20 of the air filtering air pipe assembly 2 is connected and communicated with the engine throttle 3.

Specifically, the mounting position is as shown in fig. 5, and one end of the air filter air pipe 20 of the air filter air pipe assembly 2 is connected to and communicates with the engine throttle valve of the engine.

By adopting the scheme, the air filtering air pipe assembly is installed on the engine, the air temperature at the interface of the breathing pipe is adjusted, the freezing of the breathing pipe is avoided, and the service life of the engine is prolonged.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, taken in conjunction with the specific embodiments thereof, and that no limitation of the invention is intended thereby. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.