Internal and external circulation air duct structure, heat management system, vehicle body structure and vehicle

Abstract

The utility model relates to an internal and external circulation air duct structure, a heat management system, a vehicle body structure and a vehicle, the internal and external circulation air duct structure comprises an internal circulation air return mechanism, and the internal circulation air return mechanism comprises an air return opening and an air return flow channel; the air return opening is formed in the inner rear portion of a passenger compartment of the vehicle, the first end of the air return flow channel communicates with the air return opening, and the second end of the air return flow channel extends to the front end of the vehicle and is used for conveying air flowing back through the air return opening to an air conditioner component. According to the internal and external circulation air duct structure, the air return opening is formed in the inner rear portion of the passenger compartment of the vehicle, cold air or hot air just blown out of the center console can be prevented from being directly sucked back by the air return opening, the refrigerating or heating effect on the passenger compartment can be guaranteed, and energy consumption caused by refrigerating or heating is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle manufacturing, and particularly to an internal and external circulation air duct structure, a thermal management system, a vehicle body structure, and a vehicle. Background Art

[0002] In the related art, the distance between the internal circulation air return opening of a vehicle and the air outlet of the air conditioner is relatively close. When the vehicle is in the internal circulation mode, the air blown out from the air outlet will be quickly sucked away by the air return opening, greatly affecting the heating effect in the passenger compartment. Summary of the Utility Model

[0003] The purpose of the present disclosure is to provide an internal and external circulation air duct structure, a thermal management system, a vehicle body structure, and a vehicle to solve the problems in the above-mentioned related art.

[0004] To achieve the above purpose, an aspect of the present disclosure provides an internal and external circulation air duct structure, including an internal circulation air return mechanism;

[0005] The internal circulation air return mechanism includes an air return opening and an air return flow channel;

[0006] The air return opening is arranged at the inner rear part of the passenger compartment of the vehicle. The first end of the air return flow channel is communicated with the air return opening, and the second end of the air return flow channel extends to the front end of the vehicle for delivering the air refluxed through the air return opening to the air conditioning component.

[0007] Optionally, the internal and external circulation air duct structure further includes a pressure relief valve, which is arranged at the inner rear part of the passenger compartment of the vehicle and is used for discharging the air in the passenger compartment to the external environment to realize the external circulation. The air return opening is communicated with the pressure relief valve.

[0008] Optionally, the internal and external circulation air duct structure further includes an air guiding flow channel, which is respectively communicated with the air return opening, the first end of the air return flow channel, and the pressure relief valve.

[0009] Optionally, the air guiding flow channel includes a main flow channel and a diversion opening. The two ends of the main flow channel are respectively communicated with the air return opening and the inlet of the pressure relief valve. The diversion opening is located on the side wall of the main flow channel, and the first end of the air return flow channel is communicated with the diversion opening.

[0010] Optionally, the internal circulation air return mechanism further includes a first air door, which is connected to the air return flow channel and can conduct or cut off the air return flow channel.

[0011] Optionally, the first air door includes a first door body and a first motor. The first door body is rotatably connected in the air return flow channel, and the output end of the first motor is in transmission connection with the first door body to drive the first door body to rotate;

[0012] Wherein, the first door body has a first cut-off position and a plurality of first conduction positions. At the first cut-off position, the return air flow channel is cut off by the first door body. At the plurality of first conduction positions, the conduction degree of the return air flow channel is different to adjust the return air flow rate.

[0013] Optionally, the internal and external circulation air duct structure further includes an air intake mechanism. The air intake mechanism is arranged at the front end of the vehicle. The return air flow channel extends along the front-rear direction of the vehicle. The second end of the return air flow channel is communicated with the air intake mechanism. The outlet of the air intake mechanism is used to connect with the inlet of the air conditioning component.

[0014] Optionally, the air intake mechanism includes a diversion pipe and an external circulation air inlet pipe. The second end of the return air flow channel and the external circulation air inlet pipe are both connected to one end of the diversion pipe. The other end of the diversion pipe is used to connect with the inlet of the air conditioning component.

[0015] Optionally, the air intake mechanism further includes a second air door. The second air door is connected to the external circulation air inlet pipe. The second air door can conduct or cut off the external circulation air inlet pipe.

[0016] Optionally, the second air door includes a second door body and a second motor. The second door body is rotatably connected inside the external circulation air inlet pipe. The output end of the second motor is in transmission connection with the second door body to drive the second door body to rotate;

[0017] Wherein, the second door body has a second cut-off position and a plurality of second conduction positions. At the second cut-off position, the external circulation air inlet pipe is cut off by the second door body. At the plurality of second conduction positions, the conduction degree of the external circulation air inlet pipe is different to adjust the air inlet flow rate.

[0018] The second aspect of the present disclosure further provides a thermal management system, including an air conditioning component and the above-mentioned internal and external circulation air duct structure. The second end of the return air flow channel of the internal and external circulation air duct structure is communicated with the air conditioning component to cool or heat the passenger compartment of the vehicle.

[0019] The third aspect of the present disclosure further provides a vehicle body structure, including a vehicle body main body and the above-mentioned internal and external circulation air duct structure. The air return opening is arranged on the inner rear wall of the passenger compartment of the vehicle body main body. The return air flow channel is arranged at the lower part of the vehicle body main body.

[0020] The fourth aspect of the present disclosure further provides a vehicle, including the above-mentioned internal and external circulation air duct structure, or the above-mentioned thermal management system, or the above-mentioned vehicle body structure.

[0021] In the above technical solution, by arranging the air return opening at the inner rear part of the passenger compartment of the vehicle, when the vehicle is in the internal circulation mode, the cold air or hot air blown from near the vehicle's center console can flow along the front-rear direction of the passenger compartment, enabling sufficient cooling or heating of the passenger compartment, and then flowing back from the air return opening. In this way, it can be avoided that the cold air or hot air just blown from near the center console is directly sucked back by the air return opening, ensuring the cooling or heating effect of the passenger compartment and reducing the energy consumption caused by cooling or heating. Through the arranged return air flow channel, the air inhaled through the air return opening can be guided to the air conditioning component, realizing cooling or heating and then blowing towards the passenger compartment to achieve internal circulation flow.

[0022] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0024] Figure 1 is a schematic structural diagram of the internal and external circulation air duct structure of an embodiment of the present disclosure;

[0025] Figure 2 is an embodiment of the present disclosure Figure 1 an enlarged schematic view of position A therein;

[0026] Figure 3 is an embodiment of the present disclosure Figure 1 an enlarged schematic view of position B therein.

[0027] DESCRIPTION OF THE REFERENCE NUMERALS

[0028] 1. Air return opening, 2. Return air flow channel, 3. Pressure relief valve, 4. Induced air flow channel, 41. Main channel, 42. Diverging port, 5. First air damper, 51. First door body, 52. First motor, 6. Air intake mechanism, 61. Diversion pipe, 62. External circulation intake pipe, 63. Second air damper, 631. Second door body, 632. Second motor, 7. Air conditioning component, 8. Vehicle body, 9. Passenger compartment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following will describe in detail the specific implementation of the present disclosure with reference to the drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure and is not used to limit the present disclosure.

[0030] In the present disclosure, unless otherwise stated, the orientation terms such as "upper, lower, left, and right" are generally defined according to the direction of the vehicle in the driving state. The front refers to the front direction of the vehicle, the rear refers to the rear direction of the vehicle, the upper refers to the roof direction of the vehicle, the lower refers to the bottom direction of the vehicle, the left refers to the left side direction of the vehicle, and the right refers to the right side direction of the vehicle. "Inner and outer" refer to the inside and outside of the relevant components. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present disclosure, it should also be noted that unless otherwise clearly specified and limited, the terms "arrangement" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0032] As the popularity rate of electric vehicles is getting higher and higher, the requirements for the energy consumption performance of electric vehicles during winter heating are also getting higher and higher. Since electric vehicles lack the waste heat of the engine compared with fuel vehicles, additional heat sources need to be provided during winter heating, generally mainly through PTC or heat pumps for heating. In order to improve the energy use efficiency of electric vehicles during winter, a relatively large proportion of internal circulation mixed air is generally adopted during winter heating, and the fresh air introduced from the outside is reduced to achieve the purpose of energy conservation.

[0033] In the related art, the distance between the internal circulation air return opening of the vehicle and the air outlet of the air conditioner is relatively close. Generally, the internal circulation air return opening is arranged near the footrests of the driver and passenger seats. During winter heating, when the vehicle is in the internal circulation state, the air blown out from the air outlet will be quickly sucked away by the air return opening, resulting in the heat not being transferred to the passenger compartment, greatly affecting the heating effect in the passenger compartment, especially the temperature of the heads of the driver and passengers.

[0034] Therefore, as Figures 1-3 shown, one aspect of the present disclosure provides an internal and external circulation air duct structure, including an internal circulation air return mechanism. The internal circulation air return mechanism includes an air return opening 1 and an air return flow channel 2.

[0035] The air return opening 1 is arranged at the inner rear part of the passenger compartment 9 of the vehicle. The first end of the air return flow channel 2 is communicated with the air return opening 1, and the second end of the air return flow channel 2 extends to the front end of the vehicle to convey the air flowing back through the air return opening 1 to the air conditioning component 7.

[0036] Among them, the air in the passenger compartment 9 can be sucked by the air return opening 1 located at the inner rear part of the passenger compartment 9. That is to say, the air return opening 1 is communicated with the passenger compartment 9, and the air in the passenger compartment 9 can flow from front to back.

[0037] In the above technical solution, by arranging the air return opening 1 at the inner rear part of the passenger compartment 9 of the vehicle, when the vehicle is in the internal circulation mode, the cold air or hot air blown from near the vehicle's center console can flow along the front-rear direction of the vehicle in the passenger compartment 9, enabling sufficient cooling or heating of the passenger compartment 9, and then flowing back through the air return opening 1. In this way, it can be avoided that the cold air or hot air just blown from near the center console is directly sucked back by the air return opening 1, ensuring the cooling or heating effect on the passenger compartment 9 and reducing the energy consumption caused by cooling or heating. Through the arranged air return flow channel 2, the air sucked in through the air return opening 1 can be guided to the air conditioning component 7 to achieve cooling or heating and then blown towards the passenger compartment 9, realizing internal circulation flow.

[0038] Optionally, in an embodiment of the present disclosure, the internal and external circulation air duct structure further includes a pressure relief valve 3. The pressure relief valve 3 is arranged at the inner rear part of the passenger compartment 9 of the vehicle. The pressure relief valve 3 is used to discharge the air in the passenger compartment 9 to the external environment to achieve external circulation, and the air return opening 1 is communicated with the pressure relief valve 3. Through the arranged pressure relief valve 3, external circulation can be realized. That is to say, when it is necessary to discharge the air in the passenger compartment to the outside, it can be discharged through the pressure relief valve 3, and the pressure relief valve 3 can be adjusted to open or close as needed. Thus, the external circulation mode of the passenger compartment 9 of the vehicle can be realized.

[0039] Among them, the air return opening 1 is communicated with the pressure relief valve 3. In this way, it can enable air return through one air return opening 1, saving manufacturing costs, reducing openings, and ensuring the body rigidity. Whether the air in the passenger compartment 9 flows to the air return flow channel 2 or the pressure relief valve 3 through the air return opening 1 can be selectively conducted according to whether the vehicle is actually in the internal circulation mode or the external circulation mode. That is to say, the air return opening 1 can be selectively communicated with the pressure relief valve 3 or the first end of the air return flow channel 2.

[0040] Optionally, in another embodiment of the present disclosure, the internal and external circulation air duct structure further includes a pressure relief valve 3 and an external circulation air guide opening. The pressure relief valve 3 is arranged at the inner rear part of the passenger compartment 9 of the vehicle. The pressure relief valve 3 is used to achieve external circulation, and the pressure relief valve 3 is communicated with the external circulation air guide opening. In this way, the pressure relief valve 3 and the external circulation air guide opening separately realize the discharge of the air in the passenger compartment 9 to the outside in the external circulation mode, that is, they do not share the air return opening 1.

[0041] Optionally, in an embodiment of the present disclosure, the internal and external circulation air duct structure further includes an air guiding flow channel 4. The air guiding flow channel 4 is respectively communicated with the air return opening 1, the first end of the air return flow channel 2, and the pressure relief valve 3. Through the arranged air guiding flow channel 4, it is convenient to guide the air sucked in through the air return opening 1 to the pressure relief valve 3 or the first end of the air return flow channel 2, which is conducive to the sharing of the air return opening 1, enabling the pressure relief valve 3 and the first end of the air return flow channel 2 to be simultaneously communicated with the air return opening 1.

[0042] Optionally, in one embodiment of the present disclosure, the induced air flow channel 4 includes a main flow channel 41 and a diversion port 42, the two ends of the main flow channel 41 are respectively connected to the return air port 1 and the inlet of the pressure relief valve 3, the diversion port 42 is located on the side wall of the main flow channel 41, and the first end of the return air flow channel 2 is connected to the diversion port 42. By such an arrangement, the induced air flow channel 4 forms a three-way structure, which can facilitate the first end of the return air flow channel 2 and the pressure relief valve 3 to be connected to the return air port 1, and selective conduction can be achieved.

[0043] In some examples, the main channel 41 extends along the front-to-rear direction of the vehicle, which can facilitate communication with the pressure relief valve 3, and the pressure relief valve 3 can easily discharge air to the outside of the vehicle, and the diversion port 42 is located on the side of the main channel 41, and can be easily connected through the first end of the return air channel 2.

[0044] Optionally, in another embodiment of the present disclosure, the air duct 4 can be constructed as a three-way valve, wherein the first port of the three-way valve can be connected to the return air port 1, the second port of the three-way valve can be connected to the inlet of the pressure relief valve 3, and the third port of the three-way valve can be connected to the first end of the return air duct 2, so that selective conduction can be achieved very conveniently.

[0045] Optionally, in one embodiment of the present disclosure, the internal circulation return air mechanism further includes a first damper 5, which is connected to the return air flow channel 2, and the first damper 5 can open or cut off the return air flow channel 2. The first damper 5 can control whether the air flows into the return air flow channel 2, that is, the air sucked in through the return air port 1 can be selectively diverted, and the pressure relief valve 3 itself can be controlled to be opened or closed. With the cooperation of the first damper 5 and the pressure relief valve 3, the selective diversion of the air can be achieved.

[0046] It is understandable that when the vehicle is in the internal circulation mode, the pressure relief valve 3 is closed, the first damper 5 is opened, and the air in the passenger compartment 9 is sucked in through the return air port 1, and then flows into the return air flow channel 2 through the induced air flow channel 4. When the vehicle is in the external circulation mode, the pressure relief valve 3 is opened, the first damper 5 is closed, and the air in the passenger compartment 9 is sucked in through the return air port 1, and then flows into the pressure relief valve 3 through the induced air flow channel 4, and then discharged out of the vehicle through the pressure relief valve 3.

[0047] Optionally, in an embodiment of the present disclosure, the first damper 5 includes a first door body 51 and a first motor 52, the first door body 51 is rotatably connected in the return air duct 2, and the output end of the first motor 52 is transmission connected to the first door body 51 to drive the first door body 51 to rotate.

[0048] Among them, the first door body 51 has a first truncation position and multiple first conduction positions. At the first truncation position, the return air flow channel 2 is cut off by the first door body 51. At multiple first conduction positions, the conduction degree of the return air flow channel 2 is different to adjust the return air flow rate.

[0049] Among them, the first motor 52 drives the first door body 51 to rotate, which can facilitate the truncation or conduction of the return air flow channel 2. At the same time, when the first door body 51 rotates to different angles, that is, different first conduction positions, the conduction degree of the return air flow channel 2 can be controlled, and thus the return air volume can be controlled. It can be understood that multiple first conduction positions refer to different rotation angles of the first door body 51. Among them, the first door body 51 can partially block the return air flow channel 2 and allow partial return air. In some examples, the first motor 52 is located outside the return air flow channel 2.

[0050] Optionally, in an embodiment of the present disclosure, the first air damper 5 is configured as a flow regulating valve, which can regulate the air volume and truncate or conduct the return air flow channel 2 at the same time.

[0051] Optionally, in an embodiment of the present disclosure, the return air flow channel 2 and the induced air flow channel 4 can be pipes, and the return air flow channel 2 and the induced air flow channel 4 are connected to the vehicle body main body 8 of the vehicle body structure. In another embodiment of the present disclosure, the return air flow channel 2 and the induced air flow channel 4 can be flow channels formed by grooves opened in the vehicle body main body 8 of the vehicle body structure, that is, they are part of the vehicle body main body 8.

[0052] Optionally, in an embodiment of the present disclosure, the internal and external circulation air duct structure further includes an intake mechanism 6. The intake mechanism 6 is arranged at the front end of the vehicle. The return air flow channel 2 extends along the front-rear direction of the vehicle. The second end of the return air flow channel 2 is communicated with the intake mechanism 6. The outlet of the intake mechanism 6 is used to connect with the inlet of the air conditioning component 7. By providing the intake mechanism 6, the air in the external environment can enter the air conditioning component 7, and external circulation can be realized, that is, new air can be supplemented to the passenger compartment 9. And the second end of the return air flow channel 2 is communicated with the intake mechanism 6, so that the air in the passenger compartment 9 enters the return air flow channel 2 through the return air inlet 1, and then is uniformly transported through the return air flow channel 2 and enters the air conditioning component 7 through the intake mechanism 6, which is convenient for unified control.

[0053] Optionally, in an embodiment of the present disclosure, the intake mechanism 6 includes a diversion pipe 61 and an external circulation intake pipe 62. The second end of the return air flow channel 2 and the external circulation intake pipe 62 are both connected to one end of the diversion pipe 61. The other end of the diversion pipe 61 is used to connect with the inlet of the air conditioning component 7.

[0054] Among them, the diversion pipe 61 is used for air intake collection and transports the collected air to the air conditioning component 7 to realize cooling or heating and then blow to the passenger compartment 9. The external circulation intake pipe 62 is used to introduce the air in the external environment, so that the air in the external environment flows through the diversion pipe 61 to the air conditioning component 7 and then blows to the passenger compartment 9 to realize external circulation. It can be understood that the external circulation intake pipe 62 and the return air flow channel 2 can transport air to the diversion pipe 61 separately or simultaneously.

[0055] Optionally, the intake mechanism 6 further includes a second air damper 63. The second air damper 63 is connected to the external circulation intake pipe 62, and the second air damper 63 can conduct or cut off the external circulation intake pipe 62. By providing the second air damper 63, it is possible to control whether air flows into the external circulation intake pipe 62, that is, it is possible to select whether to introduce external ambient air as needed.

[0056] It can be understood that when the vehicle is in the external circulation mode, the second air damper 63 is opened, and external ambient air can enter the diversion pipe 61 through the external circulation intake pipe 62, and then enter the air-conditioning component 7 and blow into the passenger compartment 9.

[0057] Optionally, in an embodiment of the present disclosure, the second air damper 63 includes a second door body 631 and a second motor 632. The second door body 631 is rotatably connected inside the external circulation intake pipe 62, and the output end of the second motor 632 is drivingly connected to the second door body 631 to drive the second door body 631 to rotate.

[0058] Wherein, the second door body 631 has a second cut-off position and a plurality of second conduction positions. At the second cut-off position, the external circulation intake pipe 62 is cut off by the second door body 631. At the plurality of second conduction positions, the conduction degree of the external circulation intake pipe 62 is different to adjust the air intake flow rate.

[0059] Wherein, the second motor 632 drives the second door body 631 to rotate, which can conveniently cut off or conduct the external circulation intake pipe 62. At the same time, when the second door body 631 rotates to different angles, that is, different second conduction positions, the conduction degree of the external circulation intake pipe 62 can be controlled, and thus the flow rate of the air inhaled from the external environment can be controlled. It can be understood that the plurality of second conduction positions means that the rotation angle of the second door body 631 is different. Among them, the second door body 631 can partially block the external circulation intake pipe 62 and can partially inhale external ambient air. In some examples, the second motor 632 is located outside the external circulation intake pipe 62.

[0060] Optionally, in an embodiment of the present disclosure, the second air damper 63 is configured as a flow regulating valve, and the flow regulating valve can regulate the air volume and can cut off or conduct the external circulation intake pipe 62 at the same time.

[0061] Optionally, the internal and external circulation air duct structure has three states. The first state is the single internal circulation mode. At this time, the pressure relief valve 3 is closed, the first air door 5 is opened, and the second air door 63 is closed. After the air in the passenger compartment 9 is inhaled through the air return port 1, it flows into the return air duct 2 through the air guiding duct 4 and is transported to the air conditioning component 7 through the diversion pipe 61. The second state is the single external circulation mode. At this time, the pressure relief valve 3 is opened, the first air door 5 is closed, and the second air door 63 is opened. After the air in the passenger compartment 9 is inhaled through the air return port 1, it is discharged outside the vehicle through the pressure relief valve 3, and the outside air is transported to the air conditioning component 7 through the external circulation intake pipe 62 and the diversion pipe 61. The third state is the combined internal and external circulation mode. At this time, the pressure relief valve 3 is opened, the first air door 5 is opened, and the second air door 63 is opened. After the air in the passenger compartment 9 is inhaled through the air return port 1, a part of it is discharged outside the vehicle through the pressure relief valve 3, and the other part flows into the return air duct 2 through the air guiding duct 4 and then is transported to the diversion pipe 61. At the same time, the outside air enters the diversion pipe 61 through the external circulation intake pipe 62, and then they are transported to the air conditioning component 7 together.

[0062] The second aspect of the present disclosure further provides a thermal management system, including the air conditioning component 7 and the above-mentioned internal and external circulation air duct structure. The second end of the return air duct 2 of the internal and external circulation air duct structure is communicated with the air conditioning component 7 to cool or heat the passenger compartment 9 of the vehicle. Through the provided air conditioning component 7, the air entering it can be cooled or heated and blown towards the passenger compartment 9.

[0063] The third aspect of the present disclosure further provides a vehicle body structure, including a vehicle body main body 8 and the above-mentioned internal and external circulation air duct structure. The air return port 1 is opened on the inner rear wall of the passenger compartment 9 of the vehicle body main body 8, and the return air duct 2 is arranged at the lower part of the vehicle body main body 8. Among them, the return air duct 2 can be a part of the vehicle body main body 8 or can be arranged as a separate pipe.

[0064] The fourth aspect of the present disclosure further provides a vehicle, including the above-mentioned internal and external circulation air duct structure, or the above-mentioned thermal management system, or the above-mentioned vehicle body structure.

[0065] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0066] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0067] In addition, any combination can be made among various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. An internal and external circulation air duct structure, characterized in that: Including internal circulation return air mechanism; The internal circulation return air mechanism includes a return air port and a return air flow channel; The return air vent is disposed at the inner rear portion of the vehicle's passenger compartment, the first end of the return air duct is connected to the return air vent, and the second end of the return air duct extends to the front end of the vehicle for conveying the air returned through the return air vent to the air conditioning component.

2. The internal and external circulation air duct structure according to claim 1 is characterized in that: The internal and external circulation air duct structure also includes a pressure relief valve, which is arranged at the inner rear part of the passenger compartment of the vehicle. The pressure relief valve is used to discharge the air in the passenger compartment to the external environment to achieve external circulation, and the return air port is connected to the pressure relief valve.

3. The internal and external circulation air duct structure according to claim 2 is characterized in that: The internal and external circulation air duct structure further includes an air induction flow channel, and the air induction flow channel is respectively connected to the return air port, the first end of the return air flow channel and the pressure relief valve.

4. The internal and external circulation air duct structure according to claim 3 is characterized in that: The air induced flow channel includes a main flow channel and a diversion port, the two ends of the main flow channel are respectively connected to the return air port and the inlet of the pressure relief valve, the diversion port is located on the side wall of the main flow channel, and the first end of the return air flow channel is connected to the diversion port.

5. The internal and external circulation air duct structure according to claim 1 is characterized in that: The internal circulation return air mechanism also includes a first damper, which is connected to the return air flow channel and can open or cut off the return air flow channel.

6. The internal and external circulation air duct structure according to claim 5, characterized in that: The first damper includes a first door body and a first motor, the first door body is rotatably connected in the return air channel, and the output end of the first motor is drivingly connected to the first door body to drive the first door body to rotate; Among them, the first door body has a first cut-off position and multiple first conduction positions. At the first cut-off position, the return air flow channel is cut off by the first door body. At multiple first conduction positions, the conduction degree of the return air flow channel is different to adjust the return air flow rate.

7. The internal and external circulation air duct structure according to claim 1, characterized in that: The internal and external circulation air duct structure also includes an air intake mechanism, which is arranged at the front end of the vehicle. The return air duct extends along the front and rear direction of the vehicle. The second end of the return air duct is connected to the air intake mechanism, and the outlet of the air intake mechanism is used to connect to the inlet of the air conditioning component.

8. The internal and external circulation air duct structure according to claim 7, characterized in that: The air intake mechanism includes a guide pipe and an external circulation air intake pipe. The second end of the return air duct and the external circulation air intake pipe are both connected to one end of the guide pipe, and the other end of the guide pipe is used to connect to the inlet of the air conditioning component.

9. The internal and external circulation air duct structure according to claim 8, characterized in that: The air intake mechanism further includes a second air door, which is connected to the external circulation air intake pipe and can open or close the external circulation air intake pipe.

10. The internal and external circulation air duct structure according to claim 9, characterized in that: The second damper includes a second door body and a second motor, the second door body is rotatably connected to the external circulation air intake pipe, and the output end of the second motor is drivingly connected to the second door body to drive the second door body to rotate; Among them, the second door body has a second cut-off position and multiple second conduction positions. At the second cut-off position, the external circulation air intake pipe is cut off by the second door body. At multiple second conduction positions, the conduction degree of the external circulation air intake pipe is different to adjust the intake air flow rate.

11. A thermal management system, characterized in that: It comprises an air conditioning component and an internal and external circulation air duct structure as described in any one of claims 1 to 10, wherein the second end of the return air duct of the internal and external circulation air duct structure is connected to the air conditioning component to cool or heat the passenger compartment of the vehicle.

12. A vehicle body structure, characterized in that: It comprises a vehicle body and an internal and external circulation air duct structure as described in any one of claims 1 to 10, wherein the return air port is opened on the inner rear wall of the passenger compartment of the vehicle body, and the return air duct is arranged on the bottom part of the vehicle body.

13. A vehicle, characterized in that: It includes the internal and external circulation air duct structure as described in any one of claims 1 to 10, or the thermal management system as described in claim 11, or the vehicle body structure as described in claim 12.

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