Pneumatic controller with sealing structure and vehicle seat pneumatic system

Abstract

The utility model provides a pneumatic controller with a sealing structure and a vehicle seat pneumatic system, and the pneumatic controller comprises a controller housing, an installation space is formed in the controller housing, and an installation hole channel is formed in the controller housing; the control assembly at least comprises a valve body, the valve body is provided with an air tap, the valve body is installed in the installation space, the air tap is arranged in the installation hole channel, and a first gap is formed between the inner wall of the installation hole channel and the air tap in the installation hole channel; the air release opening communicates with the installation space and the external space of the controller shell, and the first sealing structure is used for sealing the first gap. According to the scheme, air is effectively prevented from being exhausted from the controller seam in the air leakage process of the pneumatic system, so that noise is remarkably reduced, and a quieter and more comfortable driving and riding environment is provided for passengers in a vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle pneumatic systems, in particular to a pneumatic controller with a sealing structure and a vehicle seat pneumatic system. BACKGROUND

[0002] In the pneumatic system of a vehicle, the pneumatic controller plays a crucial role. With the continuous development of the automobile industry, people have increasingly high requirements for the performance and comfort of vehicles. However, traditional vehicle pneumatic controllers have some problems in actual application.

[0003] After the upper shell and the lower shell cover of the traditional vehicle pneumatic controller are closed, there will be a gap at the opening of the air outlet. During the operation of the pneumatic system, the valve body will make a loud noise when it is actuated and deflated, which will affect the quiet environment inside the vehicle. SUMMARY

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a pneumatic controller with a sealing structure and a vehicle seat pneumatic system to prevent gas from being discharged from the gap of the controller.

[0005] In a first aspect, the present application provides a pneumatic controller with a sealing structure, comprising:

[0006] A controller housing, the inside of the controller housing forms a mounting space, and the controller housing is provided with a mounting channel;

[0007] A control assembly, the control assembly at least includes a valve body, the valve body has an air outlet, the valve body is installed in the mounting space, the air outlet is placed in the mounting channel, and the inner wall of the mounting channel and the air outlet inside it have a first gap;

[0008] A gas vent, the gas vent communicates the mounting space and the outside space of the controller housing;

[0009] A first sealing structure, the first sealing structure is used to seal the first gap.

[0010] According to the technical scheme provided by the embodiments of the present application, the sealing structure includes a first groove provided on the hole wall of each mounting channel, and a sealing ring is embedded in each first groove. When the air outlet is placed in the mounting channel, the sealing ring is sleeved outside the air outlet.

[0011] According to the technical scheme provided by the embodiments of the present application, the sealing structure is a sealing sleeve provided on the controller housing, the sealing sleeve has a first opening corresponding to each mounting channel and a fourth opening corresponding to the gas vent, and each air outlet and the side wall of the first opening corresponding to it abut.

[0012] According to the technical scheme provided in the embodiment of the application, the sealing structure is a sealing baffle arranged outside the controller housing, the sealing baffle is provided with a second opening corresponding to each mounting hole, the air nozzle penetrates through the second opening corresponding thereto, when the air pipe is connected to the air nozzle, the sealing baffle is pressed by the air pipe to prevent the air nozzle from sliding off the controller housing, and the diameter of the second opening is smaller than the outer diameter of the air pipe.

[0013] According to the technical scheme provided in the embodiment of the application, the opening of the mounting hole close to the mounting space side is a third opening; the sealing structure is a sealing strip arranged in the mounting space and close to the third opening side, the sealing strip is sleeved outside each air nozzle, the sealing strip is provided with a plurality of first openings corresponding to each air nozzle, and one side of the sealing strip close to the mounting hole side is in abutment with the edge of the third opening.

[0014] According to the technical scheme provided in the embodiment of the application, the controller housing is provided with a fifth opening for arranging a connector, a second sealing structure is arranged between the fifth opening and the connector, and the second sealing structure is used for sealing a second gap between the fifth opening and the connector.

[0015] According to the technical scheme provided in the embodiment of the application, the controller housing includes a first housing and a second housing which are detachably connected, the first housing is provided with a plurality of upper grooves, the second housing is provided with a plurality of lower grooves corresponding to each upper groove, and the corresponding upper groove and lower groove cooperatively form a mounting hole.

[0016] According to the technical scheme provided in the embodiment of the application, the sealing structure is a plurality of protrusion groups arranged at the mounting hole, each protrusion group includes an upper protrusion arranged on the first housing and a lower protrusion arranged on the second housing, and each protrusion group is in interference fit with the air nozzle.

[0017] According to the technical scheme provided in the embodiment of the application, the air release port is provided with a silencer.

[0018] In a second aspect, the application provides a vehicle seat pneumatic system, the vehicle is provided with the pneumatic controller with a sealing structure as described above, and the air release port is in communication with the external space of the seat rear cabin through an air outlet pipe, and the gas discharged from the air release port is discharged from the seat rear cabin.

[0019] In summary, the application provides a pneumatic controller with a sealing structure and a pneumatic system of a vehicle seat, the pneumatic controller comprising: a controller housing, an installation space being formed inside the controller housing, and an installation hole being arranged on the controller housing; a control assembly comprising at least a valve body, the valve body having a gas nozzle, the valve body being installed in the installation space, the gas nozzle being arranged in the installation hole, and a first gap being formed between an inner wall of the installation hole and the gas nozzle; a gas discharge port being arranged to communicate the installation space with an external space of the controller housing, and a first sealing structure being arranged to seal the first gap.

[0020] Compared with the prior art, the application has the beneficial effects that the pneumatic controller with a sealing structure can effectively prevent the gas from being discharged from the gap of the controller during the deflation of the pneumatic system, thereby significantly reducing the noise and providing a more quiet and comfortable driving environment for the passengers in the vehicle. The pneumatic controller prevents the gas from being discharged from the gap of the controller housing through the sealing structure, so that the gas can be discharged from the special deflation structure, and the gas in the pneumatic system can be uniformly discharged from the specific path, so that the deflation process is more orderly, which helps to maintain the stable air pressure and ensure the normal operation of the pneumatic system, and facilitates the maintenance and repair of the system. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A structure diagram of the pneumatic controller with a sealing structure (sealing ring) provided by the embodiment of the application;

[0022] Figure 2 A structure diagram of the lower half groove provided by the embodiment of the application;

[0023] Figure 3 A structure diagram of the upper half groove provided by the embodiment of the application;

[0024] Figure 4 A structure diagram of the pneumatic controller with a sealing structure (sealing sleeve) provided by the embodiment of the application;

[0025] Figure 5 A structure diagram of the sealing sleeve provided by the embodiment of the application;

[0026] Figure 6 A structure diagram of the sealing baffle provided by the embodiment of the application;

[0027] Figure 7 A structure diagram of the pneumatic controller with a sealing structure (sealing strip) provided by the embodiment of the application;

[0028] Figure 8 A structure diagram of the sealing strip and the controller housing provided by the embodiment of the application;

[0029] Figure 9Structure schematic diagram of the structure provided by the embodiment of the present application with a sealing strip;

[0030] Figure 10 Structure schematic diagram of the structure provided by the embodiment of the present application with a sealing structure (multiple sealing segments) of a pneumatic controller;

[0031] Figure 11 Structure schematic diagram of the structure provided by the embodiment of the present application with a sealing segment;

[0032] Figure 12 Structure schematic diagram of the structure provided by the embodiment of the present application with a sealing structure (boss group) of a pneumatic controller;

[0033] Figure 13 Structure schematic diagram of the structure provided by the embodiment of the present application with a sealing structure (boss group) of a pneumatic controller; Figure 12 Partial schematic diagram of the middle A part;

[0034] Figure 14 Structure schematic diagram of the structure provided by the embodiment of the present application with a connector and a second sealing structure;

[0035] Figure 15 Structure schematic diagram of the structure provided by the embodiment of the present application with a silencer in the form of a silencer gourd;

[0036] Figure 16 Structure schematic diagram of the structure provided by the embodiment of the present application with a silencer in the form of silencer cotton;

[0037] Figure 17 Structure schematic diagram of the structure provided by the embodiment of the present application with a gas vent;

[0038] Figure 18 Structure schematic diagram of the structure provided by the embodiment of the present application with a pneumatic system of a vehicle seat.

[0039] The text annotations in the figure represent:

[0040] 1, controller housing; 11, second housing; 12, first housing; 13, air pipe; 2, valve body; 3, sealing ring; 31, lower half groove; 32, upper half groove; 4, air nozzle; 5, sealing sleeve; 6, first opening; 7, sealing baffle; 71, second opening; 8, mounting hole; 9, sealing strip; 91, first opening; 92, sealing segment; 10, boss group; 14, fifth opening; 15, second sealing structure; 16, silencer gourd; 17, silencer cotton; 18, connector; 19, fourth opening; 20, air outlet pipe; 21, gas vent; 22, seat rear cabin. DETAILED DESCRIPTION

[0041] The application will be described in further detail below with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to limit the application. In addition, it should be noted that only parts related to the application are shown in the drawings for ease of description.

[0042] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and embodiments.

[0043] Embodiment 1

[0044] As mentioned in the background, in order to solve the problems in the prior art, the present application proposes a pneumatic controller with a sealing structure, as shown in Figure 1 The pneumatic controller comprises:

[0045] A controller housing 1, which forms an installation space inside, is provided with an installation hole 8;

[0046] A control assembly, which at least comprises a valve body 2 with an air nozzle 4, is installed in the installation space, the air nozzle 4 is placed in the installation hole 8, and the inner wall of the installation hole 8 and the air nozzle 4 inside have a first gap;

[0047] An air vent 21, which communicates the installation space and the outer space of the controller housing 1;

[0048] A first sealing structure for sealing the first gap;

[0049] Further, the controller housing 1 comprises a first housing 12 and a second housing 11 which are detachably connected, the first housing 12 is provided with a plurality of upper grooves, and the second housing 11 is provided with a plurality of lower grooves corresponding to each of the upper grooves, and the corresponding upper grooves and lower grooves cooperate to form the installation hole 8.

[0050] Specifically, the controller housing 1 is composed of the first housing 12 and the second housing 11, and can be designed in the shape of a cuboid for easy installation in a specific position of a vehicle. The first housing 12 and the second housing 11 are connected by detachable connection methods such as bolts and buckles, which facilitates the maintenance and repair of the internal pneumatic mechanism. The first housing 12 is uniformly distributed with a plurality of upper grooves, and the second housing 11 has the same number of lower grooves at the corresponding positions. The upper grooves and the lower grooves can be semicircular or rectangular in shape, and when the second housing 11 is connected, the corresponding upper grooves and lower grooves cooperate to form circular or rectangular installation holes 8 for installing the air nozzle 4 of the valve body 2.

[0051] Specifically, the air nozzle 4 is used to connect an external air source or air pipe to introduce gas into the pneumatic controller. The air nozzle 4 can include an air inlet nozzle, through which the external air source enters the valve body 2 to realize the function of pneumatic control when air charging is needed; the air nozzle 4 can include an air outlet nozzle, and the pneumatic controller further includes an air outlet 21, which can be connected to the air outlet nozzle, as shown in Figure 17 , when air discharge is needed, the gas is discharged through the air outlet 21, wherein the air outlet nozzle can be connected to an air pipe to communicate with the space outside the seat rear cabin 22, and the gas can be directly discharged out of the controller housing 1 after being discharged, or can be discharged to the outside of the seat rear cabin 22.

[0052] Further, the air outlet 21 is provided with a silencer.

[0053] Specifically, as shown in Figure 16 , the silencer can be a silencer cotton 17 in the air outlet 21, as shown in Figure 15 , or a silencer gourd 16 installed on the air pipe connected to the air outlet nozzle.

[0054] Further, as shown in Figure 1 , the sealing structure includes a first groove provided on the hole wall of each mounting hole 8, and a sealing ring 3 is embedded in each first groove, and when the air nozzle 4 is placed in the mounting hole 8, the sealing ring 3 is sleeved on the outside of the air nozzle 4.

[0055] Further, as shown in Figure 2 and Figure 3 , the first housing 12 has a plurality of upper half grooves 32, and the second housing 11 has a plurality of lower half grooves 31 corresponding to each upper half groove 32, and each upper half groove 32 and the corresponding lower half groove 31 form the first groove.

[0056] Specifically, a plurality of upper half grooves 32 are machined on the first housing 12, and the second housing 11 has the same number of lower half grooves 31 at corresponding positions. The shape and size of the upper half groove 32 and the lower half groove 31 are matched with the sealing ring 3, and when the second housing 11 is connected, the upper half groove 32 and the lower half groove 31 cooperate to form a complete first groove for embedding the sealing ring 3.

[0057] Specifically, the first groove is provided on the hole wall of each mounting hole 8, which can be formed by machining a semicircular groove on the first housing 12 and the second housing 11 respectively, and a complete first groove is formed when the first housing 12 and the second housing 11 are connected. The sealing ring 3 is made of elastic materials such as rubber and silica gel, which has good sealing performance. The sealing ring 3 is embedded in the first groove, and when the air nozzle 4 is placed in the mounting hole 8, the sealing ring 3 is tightly sleeved on the outside of the air nozzle 4 to prevent gas from leaking out of the first gap.

[0058] In a preferred embodiment, referring to Figure 4 and Figure 5 , the sealing structure is a sealing sleeve 5 arranged on the controller housing 1, the sealing sleeve 5 is provided with a first opening 6 corresponding to each mounting hole 8 and a fourth opening 19 corresponding to the air release hole 21, and the side wall of each air nozzle 4 and the corresponding first opening 6 abuts.

[0059] Specifically, the sealing sleeve 5 is made of elastic materials such as rubber and silica gel, and has good sealing performance. The sealing sleeve 5 is arranged on the controller housing 1 and tightly adheres to the controller housing 1. The sealing sleeve 5 is provided with a first opening 6 corresponding to each mounting hole 8, and the size of the first opening 6 is slightly smaller than the outer diameter of the air nozzle 4, so that after the air nozzle 4 is inserted into the first opening 6, the air nozzle 4 and the side wall of the first opening 6 tightly abut, preventing gas leakage.

[0060] In a preferred embodiment, the sealing structure is a sealing baffle 7 arranged on the controller housing 1, the sealing baffle 7 is provided with a second opening 71 corresponding to each mounting hole 8, and the air nozzle 4 penetrates through the corresponding second opening 71, when the air nozzle 4 is connected with an air tube, the sealing baffle 7 is pressed by the air tube to prevent it from sliding off the controller housing 1, and the diameter of the second opening 71 is smaller than the outer diameter of the air tube.

[0061] Specifically, as shown in Figure 6 , the sealing baffle 7 is made of plastic, metal or other materials, and has certain strength and rigidity. The sealing baffle 7 is provided with a second opening 71 corresponding to each mounting hole 8, and the size of the second opening 71 is slightly larger than the outer diameter of the air nozzle 4, so that the air nozzle 4 can penetrate through the second opening 71. When the air nozzle 4 is connected with an air tube, the pressure of the air tube acts on the sealing baffle 7, making the sealing baffle 7 tightly adhere to the outer surface of the controller housing 1, preventing the sealing baffle 7 from sliding off the controller housing 1. At the same time, the outer diameter of the second opening 71 is smaller than the inner diameter of the air tube, so that the air tube can exert sufficient pressure on the sealing baffle 7, improving the sealing effect.

[0062] In a preferred embodiment, referring to Figure 7 , the opening of the mounting hole 8 close to the mounting space side is a third opening; the sealing structure is a sealing strip 9 arranged in the mounting space and close to the third opening side; as shown in Figure 8 and Figure 9 , the sealing strip 9 is arranged on each air nozzle 4, the sealing strip 9 is provided with a plurality of first openings 91 corresponding to each air nozzle 4, and one side of the sealing strip 9 close to the mounting hole 8 abuts with the edge of the third opening;

[0063] Specifically, the sealing strip 9 is used to block each third opening.

[0064] Further, as shown in Figure 10 , the sealing strip 9 comprises a plurality of sealing segments 92 connected in sequence, and each sealing segment 92 has the first opening 91.

[0065] Specifically, the opening of the mounting channel 8 near the mounting space side is a third opening, and the sealing strip 9 is arranged in the mounting space and near the third opening side. The sealing strip 9 blocks each third opening to prevent gas from leaking into the mounting space from the mounting channel 8. The sealing strip 9 can be in the form of a long strip (as shown in Figure 8 and Figure 9 ), which is fixed between the inner wall of the controller housing 1 and the outer wall of the air nozzle 4 by means of bolts, welding or the like, to ensure the position stability of the sealing strip 9 and prevent it from moving during the operation of the pneumatic controller. The sealing strip 9 is provided with a plurality of first openings 91 for penetrating each air nozzle 4, so that the air nozzle 4 can pass through the first opening 91 smoothly, while ensuring the sealing between the sealing strip 9 and the air nozzle 4. The side of the sealing strip 9 near the mounting channel 8 is in close contact with the edge of the third opening to form a seal. The sealing strip 9 can also be a small rectangular sealing segment 92 (as shown in Figure 10 and Figure 11 ), and each two sealing segments 92 are connected end to end, and each sealing strip 9 has a corresponding first opening 91.

[0066] In a preferred embodiment, the sealing structure is a plurality of protrusion groups 10 arranged at the mounting channel 8, each protrusion group 10 comprises an upper protrusion arranged on the first housing 12 and a lower protrusion arranged on the second housing 11, and each protrusion group 10 is in interference fit with the air nozzle 4.

[0067] Specifically, as shown in Figure 12 , Figure 13 , the upper protrusion and the lower protrusion are in interference fit with the air nozzle 4, that is, the size of the protrusion group 10 is slightly smaller than the outer diameter of the air nozzle 4. When the air nozzle 4 is inserted into the mounting channel 8, the protrusion group 10 is deformed by extrusion and tightly fits the outer surface of the air nozzle 4 to realize the sealing function.

[0068] In a preferred embodiment, the controller housing 1 is provided with a fifth opening 14 for arranging a connector 18, and a second sealing structure 15 is arranged between the fifth opening 14 and the connector 18 to seal a second gap between the fifth opening 14 and the connector 18.

[0069] Specifically, please refer to Figure 5 , Figure 14As shown, a fifth opening 14 adapted to the shape of the connector 18 is provided on the side of the controller housing 1 along the length direction. The connector 18 is provided in the fifth opening 14. When the connector 18 is inserted into the fifth opening 14, there is a certain gap between the side wall of the fifth opening 14 and the connector 18. This gap is the second gap. The second sealing structure 15 is sleeved on the outside of the connector 18. When the connector 18 is installed in the fifth opening 14, it tightly seals the second gap.

[0070] Example 2

[0071] Based on Example 1, such as Figure 18 As shown, this embodiment proposes a vehicle seat pneumatic system. The vehicle seat pneumatic system is equipped with a pneumatic controller with a sealed structure as described in Embodiment 1. The vent 21 is connected to the external space of the rear seat compartment 22 through the air outlet pipe 20, and the gas vented from the vent 21 is discharged from the rear seat compartment 22.

[0072] Specifically, the gas released from the vent 21 can be promptly discharged to the external space through the vent pipe 20, which can reduce the accumulation of gas in the rear compartment 22 of the seat and avoid problems such as excessively high gas temperature when inhaled into the pneumatic controller.

[0073] Specifically, when a pneumatic system is operating, if air escapes through gaps, it generates noise. This noise can interfere with the hearing of passengers, affecting their mood and concentration, and reducing driving comfort. By preventing air from escaping through gaps, noise levels can be significantly reduced, creating a quieter in-car environment. For example, during long drives, a quiet interior allows passengers to relax more and reduce fatigue. Continuous noise, on the other hand, can cause irritability and negatively impact the driving experience.

[0074] Specifically, the gases discharged from the pneumatic system are at high temperatures. If these high-temperature gases adversely affect other structures within the seat, it may lead to functional impairment, shortened lifespan, or safety hazards. Preventing gas leakage through gaps avoids contact between the high-temperature gases and other structures within the seat, protecting them from the effects of high temperatures. For example, the seat may contain electronic components, sensors, and padding materials; high-temperature gases could damage these components, affecting the seat's adjustment functions, heating functions, or the proper functioning of the airbags. Good sealing performance prevents high-temperature gases from damaging these components, ensuring the normal operation of all seat functions.

[0075] The principles and implementation manners of the present application are described by using specific examples in the present article, and the above example descriptions are only used to help understand the method of the present application and its core idea. The above descriptions are only the preferred implementation manners of the present application. It should be noted that, due to the limited nature of the language expression, there are objectively infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, refinements or changes can be made without departing from the principles of the present application, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, shall be regarded as the protection scope of the present application.

Claims

1. A pneumatic controller having a sealed structure, characterized by, The utility model provides a kind of controller shell and its sealing structure, including: Controller housing (1), the installation space is formed inside the controller housing (1), the installation hole channel (8) is equipped on the controller housing (1); Control assembly, the control assembly at least includes valve body (2), the valve body (2) has gas nozzle (4), the valve body (2) is installed in the installation space, the gas nozzle (4) is placed in the installation hole channel (8), and the inner wall of the installation hole channel (8) and the gas nozzle (4) in it have first gap; Air vent (21), the air vent (21) is communicated with the installation space and the outside space of the controller housing (1); First sealing structure, the first sealing structure is used to seal the first gap.

2. The pneumatic controller with a sealed structure according to claim 1, characterized in that: The sealing structure includes the first groove provided on the hole wall of each installation hole channel (8), and a sealing ring (3) is embedded in each first groove, when the gas nozzle (4) is placed in the installation hole channel (8), the sealing ring (3) is sleeved outside the gas nozzle (4).

3. The pneumatic controller with a sealed structure according to claim 1, characterized in that: The sealing structure is a sealing sleeve (5) sleeved outside the controller housing (1), the sealing sleeve (5) has a first opening (6) corresponding to each installation hole channel (8) and a fourth opening (19) corresponding to the air vent (21), and the sidewall of each gas nozzle (4) and the first opening (6) corresponding thereto abuts.

4. The pneumatic controller with a sealed structure according to claim 1, characterized in that: The sealing structure is a sealing baffle (7) provided outside the controller housing (1), the sealing baffle (7) has a second opening (71) corresponding to each installation hole channel (8), the gas nozzle (4) penetrates the second opening (71) corresponding thereto, when the gas nozzle (4) is connected with an air pipe (13), the sealing baffle (7) is pressed by the air pipe (13) to prevent the air pipe (13) from sliding off the controller housing (1), and the diameter of the second opening (71) is smaller than the outer diameter of the air pipe (13).

5. The pneumatic controller with a sealed structure according to claim 1, characterized in that: The opening of the installation hole channel (8) close to the installation space side is a third opening, the sealing structure is a sealing strip (9) provided in the installation space and close to the third opening side, the sealing strip (9) is sleeved outside each gas nozzle (4), the sealing strip (9) is provided with a plurality of first holes (91) corresponding to each gas nozzle (4), and one side of the sealing strip (9) close to the installation hole channel (8) side abuts with the edge of the third opening.

6. The pneumatic controller with a sealed structure according to claim 1, characterized in that: The controller housing (1) is provided with a fifth opening (14) for arranging a connector (18), and a second sealing structure (15) is arranged between the fifth opening (14) and the connector (18) to seal a second gap between the fifth opening (14) and the connector (18).

7. The pneumatic controller with a sealed structure according to claim 1, characterized by: The controller housing (1) includes a first housing (12) and a second housing (11) which are detachably connected, the first housing (12) has a plurality of upper grooves, the second housing (11) has a plurality of lower grooves corresponding to each upper groove, and the corresponding upper groove and lower groove cooperate to form an installation hole channel (8).

8. The pneumatic controller with a sealed structure according to claim 7, characterized in that: The sealing structure is a plurality of convex groups (10) arranged at the mounting hole (8), each of the convex groups (10) comprises an upper convex arranged on the first shell (12) and a lower convex arranged on the second shell (11), and each of the convex groups (10) is in interference fit with the air nozzle (4).

9. The pneumatic controller with a sealed structure according to claim 1, characterized in that: The air release port (21) is provided with a silencer.

10. A vehicle seat pneumatic system characterized by: The vehicle is internally provided with the pneumatic controller with the sealing structure as claimed in any one of claims 1-9, the air release port (21) is communicated with the external space of the rear cabin (22) of the seat through the air outlet pipe (20), and the gas released from the air release port (21) is discharged from the rear cabin (22) of the seat.

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