CN112856058B - Airtight structure based on whole car gas tightness of EMUs can keep - Google Patents

Abstract

The invention provides an airtight structure for keeping the whole air tightness performance of a motor train unit, which comprises an airtight pipe body and an airtight assembly; the air-tight pipe body is used for being embedded in the exhaust hole, and the inside of the air-tight pipe body is divided into an air outflow cavity and an air inflow cavity through a blocking piece; the airtight assembly is rotationally connected in the airtight pipe body along the radial direction of the airtight pipe body, is positioned at two sides of the barrier piece and is used for swinging under the action of the internal and external pressure difference of the vehicle body; when the internal air pressure of the vehicle body is lower than the external air pressure, the airtight assembly swings to an air inlet state which seals the air outflow cavity and opens the air inflow cavity. The airtight structure for keeping the whole air tightness of the motor train unit has the advantages of long service life and high sealing stability, so that the whole air tightness of the motor train unit can be improved.

Description

An airtight structure based on maintaining the airtight performance of the entire EMU

technical field

The invention belongs to the technical field of airtight structure design of an EMU, and more particularly relates to an airtight structure based on the maintenance of the airtight performance of the entire EMU.

Background technique

At present, through the airtight performance test of the current EMU at the vehicle level and the component level, it is found that the airtight components have a great influence on the airtight performance of the whole vehicle. The method of installing the duckbill airtight part on the air hole. The duckbill airtight part is a funnel-shaped structure made of flexible materials, and the bottom of the funnel is formed into a long contact gap similar to the duckbill. When the air pressure inside the car is higher than the outside world When the air pressure is applied, the air flow in the car breaks through the duckbill gap at the bottom of the airtight part and is discharged out of the car. When the air pressure inside the car is lower than the external air pressure, the duckbill structure at the bottom of the airtight part can be closed under the action of the air pressure on both sides, thereby preventing and Relieve the air outside the car from entering the car, so as to achieve the effect of maintaining the airtight performance inside the car. Since the flexible material is easy to age, after the age of the flexible material, the opening of the duckbill-shaped gap at the bottom of the airtight part becomes larger, which cannot effectively prevent the airflow outside the vehicle from entering the vehicle, resulting in a decrease in the airtight performance inside the vehicle, which in turn causes the air pressure comfort. question.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an airtight structure based on the maintenance of the airtight performance of the entire vehicle of the EMU, aiming to solve the problem that the airtight parts in the prior art are easy to age, thereby reducing the sealing performance and affecting the airtight performance of the entire vehicle. .

In order to achieve the above purpose, the technical solution adopted in the present invention is to provide an airtight structure based on the airtight performance of the entire vehicle of the EMU, including an airtight pipe body and an airtight assembly; the airtight pipe body is used to be embedded in the vehicle body It is used to connect the inside of the vehicle body with the outside world; the inner cavity of the airtight pipe body is divided into an air outflow cavity and an air inflow cavity distributed along the radial direction of the airtight pipe body by the blocking member; The airtight assembly is connected to the airtight tube body along the radial direction of the airtight tube body, and is located on both sides of the blocking member for swinging under the action of the internal and external pressure difference of the car body; wherein, the air pressure inside the car body is higher than the outside world When the air pressure is applied, the airtight assembly swings to the exhaust state in which the air flows out of the cavity and the air flows into the cavity closed. Intake state where the air inflow chamber is open.

As another embodiment of the present application, the cross-sectional area of the air outflow cavity is greater than the cross-sectional area of the air inflow cavity.

As another embodiment of the present application, the airtight assembly includes a rotating shaft, a first airtight blade, and a second airtight blade; wherein, both ends of the rotating shaft are respectively rotatably connected to the side wall of the airtight pipe body, and the peripheral wall is connected to the blocking member. Sealing conflict; the first airtight blade is located in the air outflow cavity and is fixedly connected with the rotating shaft to open or close the air outflow cavity; the second airtight blade is located in the air inflow cavity and is fixedly connected with the rotating shaft and is An airtight vane is angled to open or close the air flow into the cavity.

As another embodiment of the present application, in the exhaust state, the area of the area of the first airtight vane covering the air outflow cavity along the axial direction of the airtight tube body is larger than the area of the second airtight vane.

As another embodiment of the present application, the included angle between the first airtight blade and the second airtight blade is an obtuse angle.

As another embodiment of the present application, the inner wall of the airtight pipe body is provided with a limit ring. In the exhaust state, the second airtight blade is in sealing contact with the limit ring, and in the air intake state, the first airtight blade is in contact with the limit ring. The limit ring is in sealing abutment.

As another embodiment of the present application, the limit ring is located between one end of the airtight pipe body facing the inside of the vehicle body and the rotating shaft.

As another embodiment of the present application, a sealing felt pad is provided on the side wall of the limiting ring facing the rotating shaft.

As another embodiment of the present application, the blocking member includes two baffles respectively extending obliquely along the axial direction of the airtight tube body, and the two baffles make both ends of the air outflow cavity form a flared structure.

Further, the two baffles are located on two sides of the airtight assembly respectively, and the end walls of the two baffles close to each other are in sealing conflict with the airtight assembly.

The beneficial effect of the airtight structure based on the maintenance of the airtight performance of the entire EMU vehicle provided by the present invention is that compared with the prior art, the present invention provides an airtight structure based on the maintenance of the airtight performance of the entire EMU vehicle. The barrier divides the airtight tube body into an air outflow cavity and an air inflow cavity, and uses the pressure difference between the inside and outside of the vehicle to push the airtight components, so that when the internal air pressure of the vehicle body is higher than the outside air pressure, the airtight components are pushed in the airtight state. The tube body swings to the exhaust state in which the air outflow cavity is opened and the air inflow cavity is closed, or when the air pressure inside the vehicle body is lower than the outside air pressure, the airtight assembly is pushed to swing in the airtight tube body until the air flow out cavity is closed and the air is closed. The air inlet state with the inflow cavity opened, so as to realize the balance adjustment of the air pressure inside and outside the car body, and ensure the comfort of the air pressure inside the car body. The aging of the airtight components increases the service life of the airtight components, and ensures that the opening of the air outflow cavity or the air inflow cavity is always consistent under the pressure difference, thereby improving the stability of the airtight performance of the EMU.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic diagram of the internal structure of an airtight structure maintained in an exhaust state based on the airtight performance of the entire EMU vehicle provided by an embodiment of the present invention;

2 is a schematic diagram of the internal structure of an airtight structure maintained in an air intake state based on the airtight performance of a complete EMU vehicle provided by an embodiment of the present invention;

3 is a schematic diagram of the internal structure of an airtight structure based on maintaining the airtight performance of the entire EMU vehicle provided by another embodiment of the present invention;

FIG. 4 is a partial enlarged schematic view of the structure at A in FIG. 3 .

In the figure: 1. Airtight pipe body; 10. Barrier; 101. Air outflow cavity; 102, Air inflow cavity; 2. Airtight assembly; 21. Rotating shaft; ; 221, the first sealing ring; 23, the second airtight blade; 231, the second sealing ring; 3, the limit ring; 30, the sealing felt pad; 4, the limit block.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Please refer to FIG. 1 and FIG. 2 together, and now an airtight structure based on maintaining the airtight performance of the entire EMU provided by the present invention will be described. The airtight structure based on the airtight performance of the entire vehicle of the EMU includes an airtight pipe body 1 and an airtight assembly 2; the airtight pipe body 1 is used to be embedded in the exhaust hole of the vehicle body and used for The interior of the vehicle body is communicated with the outside world; the interior of the airtight tube body 1 is divided into an air outflow cavity 101 and an air inflow cavity 102 distributed along the radial direction of the airtight tube body 1 by the blocking member 10; The radial rotation of the airtight tube body 1 is connected to the airtight tube body 1, and is located on both sides of the blocking member 10, and is used for swinging under the action of the internal and external pressure difference of the car body; wherein, the air pressure inside the car body is higher than the outside world. When the air pressure is applied, the airtight assembly 2 swings to the exhaust state in which the air outflow cavity 101 is opened and the air inflow cavity 102 is closed. 101 is closed and the air flow into the cavity 102 is opened.

The working principle of an airtight structure based on maintaining the airtight performance of the entire EMU provided by the present invention is as follows: the airtight pipe body 1 can be circular, square, polygonal or other suitable for the airtight assembly 2 to be turned inside it. Since the airtight pipe body 1 is embedded in the exhaust hole of the vehicle body to connect the inside of the vehicle body with the outside world (eg, it is embedded in the exhaust hole that penetrates the bottom of the vehicle up and down), the air pressure inside the vehicle body will act Above the airtight component 2, the external air pressure will act below the airtight component 2. When the internal air pressure of the vehicle body is higher than the external air pressure, the driving force of the air pressure inside the vehicle to the airtight component 2 must be greater than the external air pressure to the airtight component. 2, so that the airtight assembly 2 is turned downward under the pressure difference between the inside and outside of the vehicle body, so that the air outflow cavity 101 is opened, the air inflow cavity 102 is closed, and the air inside the vehicle body is discharged to the outside through the air outflow cavity 101; , when the air pressure inside the car body is lower than the outside air pressure, the pressure difference between the inside and outside of the car body pushes the airtight assembly 2 to reverse (upward), so that the air outflow cavity 101 is closed and the air inflow cavity 102 is opened, so that the outside air flows through the air The cavity 102 enters the interior of the vehicle body; when there is a pressure difference inside and outside the vehicle body, the airtight assembly 2 can always maintain a stable exhaust state or intake state under the pressure difference, so as to ensure that the air flows into the cavity during the exhaust state The airtightness of 102 and the airtightness of the air outflow cavity 101 in the intake state, that is to say, the good airtight performance of the whole vehicle can be maintained in both the exhaust state and the intake state.

Compared with the prior art, the present invention provides an airtight structure based on maintaining the airtight performance of the entire EMU. Compared with the prior art, the airtight pipe body 1 is divided into an air outflow cavity 101 and an air inflow cavity 102 by the blocking member 10 . The driving effect of the pressure difference between the inside and outside of the vehicle body on the airtight assembly 2, so that when the air pressure inside the vehicle body is higher than the outside air pressure, the airtight assembly 2 is pushed to swing in the airtight pipe body 1 until the air outflow cavity 101 is opened and the air flows into the cavity. 102 in a closed exhaust state, or when the air pressure inside the vehicle body is lower than the outside air pressure, push the airtight assembly 2 to swing in the airtight pipe body 1 to an air intake state in which the air outflow cavity 101 is closed and the air inflow cavity 102 is opened , so as to achieve the balance adjustment of the air pressure inside and outside the car body, and ensure the comfort of the air pressure inside the car body. Since both the airtight assembly 2 and the airtight pipe body 1 can be made of rigid materials with strong anti-aging properties, the aging of the airtight assembly 2 can be avoided. The service life of the airtight assembly 2 is improved, and the opening of the air outflow cavity 101 or the air inflow cavity 102 is always consistent under the pressure difference, thereby improving the stability of the airtight performance of the EMU.

As a specific embodiment of the airtight structure based on the maintenance of the airtight performance of the entire EMU provided by the present invention, please refer to FIG. 1 or FIG. 2 , the cross-sectional area of the air outflow cavity 101 is larger than the cross-sectional area of the air inflow cavity 102 surface area.

Since the airtight components 2 are located on both sides of the blocking member 10 , that is to say, a part of the airtight components 2 is located in the air outflow cavity 101 , and this part matches the cross-sectional size of the air outflow cavity 101 , and the other part is located in the air inflow cavity 102 and this part matches the cross-sectional size of the air inflow cavity 102. Here, the cross-sectional area of the air outflow cavity 101 is larger than the cross-sectional area of the air inflow cavity 102 through the offset separation of the blocking member, so that the airtight assembly can be made. 2. The pressure difference between the two sides of the part located in the air outflow cavity 101 is greater than the pressure difference between the two sides of the part located in the air inflow cavity 102. Therefore, when the air pressure inside the vehicle body is higher than the outside air pressure, the pressure difference can push the air outflow cavity. The airtight assembly 2 of 101 swings downward, and at the same time drives the airtight assembly 2 located in the air inflow cavity 102 to swing upward, so that the air outflow cavity 101 is opened and the air inflow cavity 102 is closed; otherwise, when the air pressure inside the vehicle body is lower than the outside world At the time of air pressure, the pressure difference on both sides of the airtight component 2 located in the air outflow cavity 101 can push the airtight component 2 to swing in the opposite direction, so that the air outflow cavity 101 is closed and the air inflow cavity 102 is opened. The pressure difference between the two sides of the airtight assembly 2 in the cavity 101 can be used as the dominant driving force for driving the airtight assembly 2 to swing, and the pressure difference between the two sides of the airtight assembly 2 located in the air flow cavity is the swing of the airtight assembly 2. resistance, the difference between the two is the swing force on the whole airtight component 2, the structure is simple and stable, and the response is sensitive. Different sizes can improve the stability of the exhaust or intake state.

In this embodiment, please refer to FIG. 1 and FIG. 2 , the airtight assembly 2 includes a rotating shaft 21 , a first airtight blade 22 , and a second airtight blade 23 ; two ends of the rotating shaft 21 are respectively connected to the airtight pipe body 1 . The side wall of the swivel is rotatably connected, and the peripheral wall is in sealing conflict with the blocking member 10; the first airtight blade 22 is located in the air outflow cavity 101 and is fixedly connected with the rotating shaft 21 for opening or closing the air outflow cavity 101; the second airtight The vanes 23 are located in the air inflow cavity 102 , are fixedly connected with the rotating shaft 21 , and form an included angle structure with the first airtight vanes 22 , and are used to open or close the air inflow cavity 102 .

The rotating shaft 21 is in sealing conflict with the blocking member 10, which can ensure that when the first airtight blade 22 and the second airtight blade 23 fixedly connected to the rotating shaft 21 are located in the air outflow cavity 101 and the air inflow cavity 102, respectively, the blocking member 10 will The isolation and airtightness of the air outflow cavity 101 and the air inflow cavity 102 prevents the cross-mixing of the air flow between the air outflow cavity 101 and the air inflow cavity 102 and affects the stability of the exhaust or intake state; The airtight blade 22 and the second airtight blade 23 can ensure that when the first airtight blade 22 swings to a horizontal state (the radial direction of the airtight pipe body 1 ) to seal the air out of the cavity 101 (specifically, the first airtight The periphery of the vane 22 is in close contact with the cavity wall of the air outflow cavity 101 ), the second airtight vane 23 can be in an inclined state to open the air inflow cavity 102 and push the first airtight vane 22 under the action of the pressure difference between the inside and outside of the vehicle. When the air outflow cavity 101 is opened by swinging to an inclined state, the second airtight blade 23 can swing to a horizontal state, thereby sealing the air inflow cavity 102, and the structure is simple and stable.

Specifically, referring to FIG. 1 , in the exhaust state, the area of the first airtight vane 22 covering the air outflow cavity 101 along the axial direction of the airtight pipe body 1 is larger than the area of the second airtight vane 23 . In the exhaust state, the first airtight blade 22 is inclined, that is, it has a certain angle relative to the axial direction of the airtight tube body 1. When the air pressure inside the vehicle body is reduced to lower than the outside air pressure, the air flows out of the cavity The direction of the airflow in 101 is reversed, and it begins to flow from the outside to the inside of the vehicle body. At this time, the area where the airflow acts on the first airtight blade 22 is that the first airtight blade 22 covers the air along the axial direction of the airtight pipe body 1 . Since the area of the cavity 101 flows out, the thrust generated by the pressure difference acting on both sides of the first airtight blade 22 is the product of the area of the coverage area and the pressure difference. Since the area of this area is larger than the area of the second airtight blade 23, therefore The thrust is also greater than the thrust generated by the pressure difference inside and outside the vehicle on the second airtight blade 23, that is, the pressure difference between the inside and outside of the vehicle pushes the first airtight blade 22 to overcome the resistance on the second airtight blade 23 to swing upward, Therefore, the air outflow cavity 101 is closed, the air inflow cavity 102 is opened, and air is injected into the interior of the vehicle body. The structure is simple, the stability is high, and the transition between the exhaust state and the intake state is sensitive, so that the air pressure inside the vehicle body can be maintained. Good comfort.

As a specific implementation of the embodiment of the present invention, please refer to FIG. 1 and FIG. 2 , the included angle between the first airtight blade 22 and the second airtight blade 23 is an obtuse angle. Ensure that the first airtight blade 22 and the second airtight blade 23 can extend to the inside of the air outflow cavity 101 and the air inflow cavity 102 respectively after the rotating shaft 21 is connected, and avoid interference with the blocking member during the swinging process to ensure sensitive action Stablize.

As a specific implementation of the embodiment of the present invention, please refer to FIG. 1 and FIG. 2 , the inner wall of the airtight pipe body 1 is provided with a limit ring 3 , in the exhaust state, the second airtight blade 23 and the limit ring 3 Sealing contact, in the intake state, the first airtight vane 22 is in sealing contact with the limiting ring 3 . On the one hand, the function of the limit ring 3 is to limit the swing angle of the airtight assembly 2, so that the airtight assembly 2 can be stably maintained in the exhaust state or the intake state, and on the other hand, it can be in the exhaust state. The airtight blade 23 cooperates to realize the sealing of the air inflow cavity 102, and cooperates with the first airtight blade 22 to realize the sealing of the air outflow cavity 101 in comparison with the state, so as to ensure the sealing performance of the airtight assembly 2, thereby improving the overall air quality of the EMU. dense performance.

Specifically, please refer to FIG. 1 and FIG. 2 , the limiting ring 3 is located between the end of the airtight tube body 1 facing the inside of the vehicle body and the rotating shaft 21 . When the air pressure inside the vehicle is higher than the outside air pressure, the first airtight blade 22 swings downward under the action of the pressure difference inside and outside the vehicle, and simultaneously drives the second airtight blade 23 to swing upward until the second airtight blade 23 and the limit ring 3 contact and keep the airtight assembly 2 in the exhaust state; on the contrary, when the air pressure inside the vehicle is lower than the outside air pressure, the first airtight blade 22 swings upward from the inclined state to the limit under the action of the pressure difference between the inside and outside of the vehicle. The position ring 3 abuts and drives the second airtight blade 23 to swing downward to open the air inflow cavity 102 , so that the airtight assembly 2 is kept in the intake state, and the structure is simple and stable.

Further, please refer to FIG. 1 and FIG. 2 , a sealing felt pad 30 is provided on the side wall of the limiting ring 3 facing the rotating shaft 21 . Ensure the abutment and sealing performance of the first airtight blade 22 or the second airtight blade 23 and the limit ring 3, thereby improving the airtight performance of the air flowing into the cavity 102 in the exhaust state, and the air flowing out of the cavity 101 in the air intake state. The airtight performance of the vehicle is improved.

As a specific implementation of another embodiment of the present invention, please refer to FIG. 3 to FIG. 4 , a first sealing ring 221 is provided on the periphery of the first airtight blade 22. When the first airtight blade 22 swings to a horizontal state, the A sealing ring 221 is in close contact with the cavity wall of the air outflow cavity 101 ; a second sealing ring 231 is provided on the periphery of the second airtight blade 23. When the second airtight blade 23 swings to a horizontal state, the second sealing ring 231 It is closely fitted with the cavity wall of the air inflow cavity 102 ; a limit pin 211 is arranged on the peripheral wall of the rotating shaft 21 , and two limit blocks 4 are arranged on the inner wall of the airtight sleeve along the circumferential direction of the rotating shaft 21 . When the blade 22 swings to a horizontal state, the limit pin 211 abuts with one of the limit blocks 4 , and when the second airtight blade 23 swings to a horizontal state, the limit pin 211 abuts against the other limit block 4 .

The abutting relationship between the two limit blocks 4 and the limit pin 211 can limit the rotation angle of the rotating shaft 21, thereby limiting the swing angle of the first airtight blade 22 and the second airtight blade 23, ensuring the exhaust state and air intake. The state can be stably maintained, thereby improving the sealing reliability; the adhesion of the first sealing ring 221 and the air outflow cavity 101 and the adhesion of the second sealing ring 231 to the air inflow cavity 102 can improve the air inflow cavity 102 in the exhaust state. The air-tightness of the whole vehicle is improved, and the sealing effect of the air flowing out of the cavity 101 in the intake state is improved.

As a specific implementation of the embodiment of the present invention, please refer to FIG. 1 and FIG. 2 , the blocking member 10 includes two baffles extending obliquely along the axial direction of the airtight pipe body 1 respectively, and the two baffles allow the air to flow out of the cavity Both ends of 101 are formed into a flared structure. When the air pressure inside the car body is higher than the outside air pressure, the flared structure toward the inside of the car body can guide the air flow inside the car body to enter the air outflow cavity 101 , so as to push the airtight assembly 2 to swing smoothly and open the air outflow cavity 101 . When the air pressure inside the body is lower than the outside air pressure, the flared structure facing the outside can guide the outside air into the air outflow cavity 101 , thereby pushing the airtight assembly 2 to swing in the opposite direction under the action of the pressure difference between the inside and outside of the vehicle, thereby sealing the air outflow cavity 101 . The air inflow cavity 102 is opened. By setting the flare structure, the response sensitivity of the airtight assembly 2 to the pressure difference inside and outside the vehicle can be improved, so that the airtight assembly 2 can be in the exhaust state and the intake state in time according to the pressure difference inside and outside the vehicle. switch between, thereby improving the air pressure comfort inside the car body.

In this embodiment, please refer to FIG. 1 and FIG. 2 , two baffles are located on two sides of the airtight assembly 2 respectively, and the end walls of the two baffles close to each other are in sealing conflict with the airtight assembly 2 . The two baffles located on both sides of the airtight assembly 2 are in sealing conflict with the airtight assembly 2 respectively, so that the air inflow cavity 102 and the air outflow cavity 101 can be sealed and isolated, and since the airtight assembly 2 can The position between the baffles passes through and the two ends extend into the air outflow cavity 101 and the air inflow cavity 102 respectively, and the space between the two baffles can also be suitable for the airtight assembly 2 to swing, so as to avoid the airtight assembly 2 It interferes with the baffle and affects the swing sensitivity of the airtight assembly 2 .

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (5)

1. an airtight structure based on the airtight performance of the whole vehicle of the EMU, is characterized in that, comprising: The airtight pipe body is used to be embedded in the exhaust hole of the vehicle body, and used to communicate the inside of the vehicle body with the outside world; The air outflow cavity and the air inflow cavity are distributed at intervals; the cross-sectional area of the air outflow cavity is larger than the cross-sectional area of the air inflow cavity, and the blocking member includes two respectively inclined along the axial direction of the airtight pipe body an extended baffle, the two baffles make both ends of the air outflow cavity form a flared structure; an airtight assembly, connected to the airtight tube body along the radial direction of the airtight tube body, and located on both sides of the blocking member, for swinging under the action of the internal and external pressure difference of the vehicle body; Wherein, when the internal air pressure of the vehicle body is higher than the external air pressure, the airtight assembly swings to an exhaust state in which the air outflow cavity is opened and the air inflow cavity is closed. When the internal air pressure is lower than the external air pressure, the airtight assembly swings to an air intake state in which the air outflow cavity is closed and the air inflow cavity is opened; The airtight assembly includes: a rotating shaft, two ends of which are respectively rotatably connected to the side wall of the airtight pipe body, and the peripheral wall is in sealing conflict with the blocking member; a first airtight blade, located in the air outflow cavity and fixedly connected with the rotating shaft, for opening or closing the air outflow cavity; The second airtight blade is located in the air inflow cavity, is fixedly connected with the rotating shaft, and forms an angle structure with the first airtight blade, and is used for opening or closing the air inflow cavity; Wherein, the included angle between the first airtight blade and the second airtight blade is an obtuse angle, and in the exhaust state, the first airtight blade is along the axial direction of the airtight pipe body The area of the area covering the air outflow cavity is larger than the area of the second airtight vane. 2. The airtight structure based on maintaining the airtight performance of the entire vehicle of the EMU as claimed in claim 1, wherein the inner wall of the airtight pipe body is provided with a limit ring, and in the exhaust state, The second airtight blade is in sealing contact with the limiting ring, and in the air intake state, the first airtight blade is in sealing contact with the limiting ring. 3 . The airtight structure based on maintaining the airtight performance of the entire vehicle of the EMU as claimed in claim 2 , wherein the limiting ring is located at the end of the airtight pipe body facing the interior of the vehicle body and between the shafts. 4 . The airtight structure based on maintaining the airtight performance of the entire EMU as claimed in claim 3 , wherein a sealing felt pad is provided on the side wall of the limiting ring facing the rotating shaft. 5 . 5. The airtight structure based on maintaining the airtight performance of the entire EMU vehicle according to claim 1, wherein the two baffles are respectively located on both sides of the airtight assembly, and the two The end walls of the baffle plates that are close to each other are in sealing conflict with the airtight assembly.

Images