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

Airtight structure based on whole car gas tightness of EMUs can keep Download PDF

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Publication number
CN112856058B
CN112856058B CN202110067805.8A CN202110067805A CN112856058B CN 112856058 B CN112856058 B CN 112856058B CN 202110067805 A CN202110067805 A CN 202110067805A CN 112856058 B CN112856058 B CN 112856058B
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CN
China
Prior art keywords
airtight
air
cavity
blade
pipe body
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CN202110067805.8A
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Chinese (zh)
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CN112856058A (en
Inventor
张雷
刘斌
张博
刘彬
孔繁冰
聂锡成
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CRRC Tangshan Co Ltd
China State Railway Group Co Ltd
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CRRC Tangshan Co Ltd
China State Railway Group Co Ltd
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Priority to CN202110067805.8A priority Critical patent/CN112856058B/en
Publication of CN112856058A publication Critical patent/CN112856058A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61C—LOCOMOTIVES; MOTOR RAILCARS
    • B61C17/00—Arrangement or disposition of parts; Details or accessories not otherwise provided for; Use of control gear and control systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L29/00—Joints with fluid cut-off means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/07—Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining

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

Airtight structure based on whole car gas tightness of EMUs can keep
Technical Field
The invention belongs to the technical field of design of an airtight structure of a motor train unit, and particularly relates to an airtight structure capable of keeping the whole air tightness of the motor train unit.
Background
At present, the airtightness performance test of the whole train level and the component level is carried out on the existing motor train unit, the influence of the airtightness component on the airtightness performance of the whole train is found to be large, the mode that the duckbill airtightness component is installed on the one-way exhaust hole in the bottom of the train is adopted in the airtight structure of the existing motor train unit, the duckbill airtightness component is of a funnel-shaped structure made of flexible materials, the bottom of the funnel forms a long-strip-shaped contact gap similar to a duckbill, when the air pressure in the train is higher than the external air pressure, the air flow in the train breaks through the duckbill gap in the bottom of the airtightness component to be discharged out of the train, and when the air pressure in the train is lower than the external air pressure, the duckbill structure in the bottom of the airtightness component can be closed under the effect of the air pressures on two sides of the duckbill, so that the air outside the train is prevented and relieved from entering the train, and the effect of keeping of the airtightness performance in the train is achieved. Because flexible material is ageing easily, after flexible material is ageing, the duckbilled type gap opening grow of airtight part bottom can't effectively prevent the outer air current of car to spread into in the car, leads to the interior gas tightness ability of car to descend, and then arouses the problem of atmospheric pressure travelling comfort.
Disclosure of Invention
The invention aims to provide an airtight structure for maintaining the whole vehicle airtightness based on a motor train unit, and aims to solve the problems that in the prior art, an airtight component is easy to age, so that the sealing performance is reduced, and the whole vehicle airtightness is affected.
In order to achieve the purpose, the invention adopts the technical scheme that: the airtight structure for keeping the whole vehicle airtightness based on the motor train unit comprises an airtight pipe body and an airtight assembly; the air-tight pipe body is used for being embedded in an exhaust hole of the vehicle body and communicating the interior of the vehicle body with the outside; the inner cavity of the airtight pipe body is divided into an air outflow cavity and an air inflow cavity which are distributed at intervals along the radial direction of the airtight pipe body 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.
As another embodiment of the present application, the cross-sectional area of the air outflow chamber is larger than the cross-sectional area of the air inflow chamber.
As another embodiment of the present application, the airtight assembly includes a rotation shaft, a first airtight vane, and a second airtight vane; wherein, two ends of the rotating shaft are respectively connected with the side wall of the airtight pipe body in a rotating way, and the peripheral wall is in sealing contact with the blocking piece; the first airtight blade is positioned in the air outflow cavity, is fixedly connected with the rotating shaft and is used for opening or closing the air outflow cavity; the second airtight blade is positioned in the air inflow cavity, is fixedly connected with the rotating shaft, forms an included angle structure with the first airtight blade and is used for opening or closing the air inflow cavity.
As another embodiment of the present application, in the air discharging state, an area of a region of the first airtight vane covering the air outflow chamber in the axial direction of the airtight tube body is larger than an area of the second airtight vane.
As another embodiment of the present application, an included angle between the first airtight vane and the second airtight vane is an obtuse angle.
As another embodiment of this application, the inner wall of airtight body is equipped with the spacing ring, and during exhaust state, the sealed butt of second airtight blade and spacing ring, during the air intake state, the sealed butt of first airtight blade and spacing ring.
As another embodiment of the present application, the limiting ring is located between the rotating shaft and one end of the airtight tube body facing the interior of the vehicle body.
As another embodiment of the application, the side wall of the limiting ring facing the rotating shaft is provided with a sealing felt pad.
As another embodiment of the present application, the blocking member includes two blocking plates that extend obliquely in the axial direction of the airtight tube body, respectively, and the two blocking plates form both ends of the air outflow chamber into flared structures.
Further, two baffles are located the both sides of airtight subassembly respectively, and the end wall that two baffles are close to each other all contradicts with airtight subassembly is sealed.
The invention provides an airtight structure for keeping the whole air tightness of a motor train unit, which has the beneficial effects that: compared with the prior art, the airtight structure capable of keeping the whole air tightness of the motor train unit is characterized in that the airtight pipe body is divided into the air outflow cavity and the air inflow cavity through the partition member, the airtight assembly is pushed to swing in the airtight pipe body to the exhaust state that the air outflow cavity is opened and the air inflow cavity is closed when the air pressure in the motor train unit is higher than the external air pressure by utilizing the pushing effect of the pressure difference between the inside and the outside of the motor train unit on the airtight assembly, or the airtight assembly is pushed to swing in the airtight pipe body to the air inlet state that the air outflow cavity is closed and the air inflow cavity is opened when the air pressure in the motor train unit is lower than the external air pressure, so that the balance adjustment of the air pressure inside and the outside of the motor train unit is realized, the comfort of the air pressure in the motor train unit is ensured, the airtight assembly and the airtight pipe body can be made of rigid materials with strong ageing resistance, the ageing of the airtight assembly can be avoided, and the service life of the airtight assembly is prolonged, the opening degree of the air outflow cavity or the air inflow cavity is ensured to be always kept consistent under the pushing of the pressure difference, so that the stability of the whole air tightness of the motor train unit is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic internal structural diagram of an airtight structure for maintaining the whole train airtight performance based on a motor train unit according to an embodiment of the invention in an exhaust state;
FIG. 2 is a schematic internal structural diagram of an airtight structure for maintaining the whole train airtight performance based on a motor train unit according to an embodiment of the invention in an air intake state;
FIG. 3 is a schematic internal structural diagram of an airtight structure for maintaining the overall air tightness of a motor train unit according to another embodiment of the invention;
fig. 4 is a partially enlarged structural view of a portion a in fig. 3.
In the figure: 1. an airtight tube body; 10. a barrier; 101. an air outflow chamber; 102. an air inflow chamber; 2. a hermetic component; 21. a rotating shaft; 211. a spacing pin; 22. a first airtight vane; 221. a first seal ring; 23. a second airtight vane; 231. a second seal ring; 3. a limiting ring; 30. sealing the felt pad; 4. and a limiting block.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 2 together, an airtight structure for maintaining the overall airtight performance of the motor train unit according to the present invention will now be described. The airtight structure for maintaining the whole vehicle airtightness based on the motor train unit comprises an airtight pipe body 1 and an airtight assembly 2; the airtight pipe body 1 is embedded in an exhaust hole of the vehicle body and used for communicating the interior of the vehicle body with the outside; the inside of the airtight tube body 1 is divided into an air outflow chamber 101 and an air inflow chamber 102 which are distributed at intervals in the radial direction of the airtight tube body 1 by a barrier 10; the airtight component 2 is rotatably connected in the airtight pipe body 1 along the radial direction of the airtight pipe body 1, is positioned at two sides of the barrier piece 10 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 component 2 swings to an exhaust state in which the air outflow chamber 101 is opened and the air inflow chamber 102 is closed, and when the internal air pressure of the vehicle body is lower than the external air pressure, the airtight component 2 swings to an intake state in which the air outflow chamber 101 is closed and the air inflow chamber 102 is opened.
The working principle of the airtight structure for keeping the whole air tightness of the motor train unit provided by the invention is as follows: the airtight pipe body 1 can be round, square, polygonal or other shapes suitable for the airtight component 2 to turn over in the airtight pipe body, because the airtight pipe body 1 is embedded in the exhaust hole of the vehicle body to communicate the interior of the vehicle body with the outside (for example, embedded in the exhaust hole which penetrates through the bottom of the vehicle from top to bottom), the air pressure in the vehicle body can act on the upper side of the airtight component 2, the outside air pressure can act on the lower side of the airtight component 2, when the air pressure in the vehicle body is higher than the outside air pressure, the driving force of the air pressure in the vehicle to the airtight component 2 is inevitably greater than the driving force of the outside air pressure to the airtight component 2, so that the airtight component 2 turns over downwards under the driving of the pressure difference between the interior and the exterior of the vehicle body, the air outflow cavity 101 is opened, the air inflow cavity 102 is closed, and the air flow in the vehicle body is discharged to the outside through the air outflow cavity 101; on the contrary, when the air pressure in the vehicle body is lower than the external air pressure, the pressure difference between the inside and the outside of the vehicle body pushes the airtight component 2 to reversely turn (upwards), so that the air outflow cavity 101 is closed, the air inflow cavity 102 is opened, and the external air enters the vehicle body through the air inflow cavity 102; under the condition of pressure difference between the inside and the outside of the vehicle body, the airtight assembly 2 can always keep a stable exhaust state or intake state under the pushing of the pressure difference, so that the sealing performance of the air inflow cavity 102 in the exhaust state and the sealing performance of the air outflow cavity 101 in the intake state can be ensured, namely, the good airtight performance of the whole vehicle can be kept in the exhaust state and the intake state.
Compared with the prior art, the invention provides an airtight structure capable of keeping the whole air tightness of the motor train unit, the airtight pipe body 1 is divided into an air outflow cavity 101 and an air inflow cavity 102 through a barrier member 10, the airtight assembly 2 is pushed to swing in the airtight pipe body 1 to an exhaust state that the air outflow cavity 101 is opened and the air inflow cavity 102 is closed by utilizing the pushing action of the pressure difference between the inside and the outside of the motor train unit on the airtight assembly 2, when the air pressure in the motor train unit is higher than the outside air pressure, or the airtight assembly 2 is pushed to swing in the airtight pipe body 1 to an air inlet state that the air outflow cavity 101 is closed and the air inflow cavity 102 is opened when the air pressure in the motor train unit is lower than the outside air pressure, so that the balance adjustment of the air pressure inside and the motor train unit is realized, the comfortable feeling of the air pressure in the motor train unit is ensured, and the airtight assembly 2 and the airtight pipe body 1 can be made of rigid materials with strong anti-aging performance, the aging of the airtight component 2 can be avoided, the service life of the airtight component 2 is prolonged, and the opening degree of the air outflow cavity 101 or the air inflow cavity 102 is ensured to be always kept consistent under the pushing of the pressure difference, so that the stability of the air tightness of the whole motor train unit is improved.
Referring to fig. 1 or fig. 2, as an embodiment of the air-tight structure for maintaining the whole vehicle air-tightness based on the motor train unit, the cross-sectional area of the air outflow cavity 101 is larger than the cross-sectional area of the air inflow cavity 102.
Since the airtight members 2 are located on both sides of the blocking member 10, that is, a portion of the airtight member 2 is located in the air outflow chamber 101 and is matched with the cross-sectional dimension of the air outflow chamber 101, and another portion is located in the air inflow chamber 102 and is matched with the cross-sectional dimension of the air inflow chamber 102, the cross-sectional area of the air outflow chamber 101 is made larger than that of the air inflow chamber 102 by the partial separation of the blocking member, so that the pressure difference between both sides of the portion of the airtight member 2 located in the air outflow chamber 101 can be made larger than that of the portion located in the air inflow chamber 102, and therefore, when the air pressure inside the vehicle body is higher than the external air pressure, the pressure difference can push the airtight member 2 located in the air outflow chamber 101 to swing downward while driving the airtight member 2 located in the air inflow chamber 102 to swing upward, thereby opening the air outflow chamber 101, The air inflow chamber 102 is closed; on the contrary, when the inside atmospheric pressure of automobile body is less than external atmospheric pressure, the pressure differential that is located airtight subassembly 2 both sides in air outflow chamber 101 can promote airtight subassembly 2 reverse swing, thereby make air outflow chamber 101 seal, air inflow chamber 102 is opened, that is to say, the pressure differential that is located airtight subassembly 2 both sides in air outflow chamber 101 can be regarded as the drive airtight subassembly 2 wobbling dominant driving force, and the pressure differential that is located airtight subassembly 2 both sides in the air outflow human cavity is airtight subassembly 2's swing resistance, the difference between them is the whole pendulum power that receives of airtight subassembly 2, moreover, the steam generator is simple in structure and stable, the response is sensitive, compare in adopting duckbilled structure can lead to airtight structure to open the mode of variation in size under the inside and outside pressure differential effect of automobile body of difference, can improve the stability of exhaust or air intake state.
In the present embodiment, referring to fig. 1 and fig. 2, the hermetic component 2 includes a rotating shaft 21, a first hermetic blade 22, and a second hermetic blade 23; wherein, both ends of the rotating shaft 21 are respectively rotatably connected with the side wall of the airtight tube body 1, and the peripheral wall is in sealing contact with the barrier piece 10; the first airtight blade 22 is positioned in the air outflow cavity 101, is fixedly connected with the rotating shaft 21, and is used for opening or closing the air outflow cavity 101; the second airtight vane 23 is located in the air inflow chamber 102, is fixedly connected to the rotating shaft 21, and forms an included angle with the first airtight vane 22, so as to open or close the air inflow chamber 102.
The rotating shaft 21 is in sealing interference with the blocking piece 10, so that under the condition that the first airtight blade 22 and the second airtight blade 23 fixedly connected with the rotating shaft 21 are respectively positioned in the air outflow cavity 101 and the air inflow cavity 102, the blocking piece 10 can ensure the isolation airtightness of the air outflow cavity 101 and the air inflow cavity 102, and the influence of cross mixing of air flow between the air outflow cavity 101 and the air inflow cavity 102 on the stability of an exhaust or intake state is avoided; the first airtight blade 22 and the second airtight blade 23 forming the included angle structure can ensure that when the first airtight blade 22 swings to the horizontal state (the radial direction of the airtight pipe body 1) to seal the air outflow cavity 101 (specifically, the periphery of the first airtight blade 22 is attached and sealed with the cavity wall of the air outflow cavity 101), the second airtight blade 23 can be in the inclined state to open the air inflow cavity 102, and when the first airtight blade 22 is pushed to swing to the inclined state under the action of the pressure difference between the inside and the outside of the vehicle body to open the air outflow cavity 101, the second airtight blade 23 can swing to the horizontal state along with the first airtight blade 22, so that the air inflow cavity 102 is sealed, 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 tube 1 is larger than the area of the second airtight vane 23. In the exhaust state, the first airtight vane 22 is inclined, that is, has a certain angle with respect to the axial direction of the airtight tube body 1, when the air pressure in the vehicle body is reduced to be lower than the ambient air pressure, the direction of the air flow in the air outflow cavity 101 is reversed, and the air flow starts to flow from the ambient to the vehicle body, at this time, the area of the air flow acting on the first airtight vane 22 is the area of the first airtight vane 22 covering the air outflow cavity 101 along the axial direction of the airtight tube body 1, so the thrust generated by the pressure difference acting on both sides of the first airtight vane 22 is the product of the area of the covering area and the pressure difference, since the area of the area is larger than the area of the second airtight vane 23, the thrust is also larger than the thrust generated by the pressure difference between the inside and outside of the vehicle body to the second airtight vane 23, that is, the pressure difference between the inside and outside of the vehicle body pushes the first airtight vane 22 to swing upward against the resistance of the second airtight vane 23, therefore, the air outflow cavity 101 is closed, the air inflow cavity 102 is opened, air starts to be injected into the vehicle body, the structure is simple, the stability is high, the switching between the exhaust state and the air intake state is sensitive, and the air pressure in the vehicle body can be kept at a good comfort level.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 1 and fig. 2, an included angle between the first airtight vane 22 and the second airtight vane 23 is an obtuse angle. The first airtight blade 22 and the second airtight blade 23 are ensured to respectively extend to the inside of the air outflow cavity 101 and the air inflow cavity 102 after the rotating shaft 21 is connected, and are prevented from interfering with the barrier in the swinging process, so that the action is ensured to be sensitive and stable.
Referring to fig. 1 and 2, a limiting ring 3 is disposed on an inner wall of the airtight tube 1, and the second airtight vane 23 is in sealing contact with the limiting ring 3 in an exhaust state, and the first airtight vane 22 is in sealing contact with the limiting ring 3 in an intake state. The limiting ring 3 is used for limiting the swing angle of the airtight component 2 so that the airtight component 2 can be stably kept in an exhaust state or an air intake state, and is matched with the second airtight blade 23 to seal the air inflow cavity 102 in the exhaust state and matched with the first airtight blade 22 to seal the air outflow cavity 101 in the comparison state, so that the sealing performance of the airtight component 2 is ensured, and the air tightness of the whole motor train unit is improved.
Specifically, referring to fig. 1 and 2, the limiting ring 3 is located between the end of the airtight tube 1 facing the interior of the vehicle body and the rotating shaft 21. When the air pressure in the vehicle is higher than the external air pressure, the first airtight blade 22 swings downwards under the action of the pressure difference between the inside and the outside of the vehicle body, and simultaneously drives the second airtight blade 23 to swing upwards until the second airtight blade 23 abuts against the limiting ring 3 and the airtight assembly 2 is kept in an exhaust state; on the contrary, when the air pressure in the vehicle is lower than the external air pressure, the first airtight blade 22 swings upwards from the inclined state to abut against the limit ring 3 under the action of the pressure difference between the inside and the outside of the vehicle body, and simultaneously drives the second airtight blade 23 to swing downwards to open the air inflow cavity 102, so that the airtight assembly 2 is kept in the air inflow state, and the structure is simple and stable.
Further, referring to fig. 1 and 2, a sealing felt 30 is disposed on a side wall of the limiting ring 3 facing the rotating shaft 21. The abutting sealing performance of the first airtight blade 22 or the second airtight blade 23 and the limiting ring 3 is ensured, so that the air tightness of the air inflow cavity 102 in the exhaust state and the air tightness of the air outflow cavity 101 in the intake state are improved, and the air tightness of the whole vehicle is improved.
As another embodiment of the present invention, referring to fig. 3 to 4, a first sealing ring 221 is disposed around the first airtight vane 22, and when the first airtight vane 22 swings to a horizontal state, the first sealing ring 221 is tightly attached to the cavity wall of the air outflow cavity 101; a second sealing ring 231 is arranged on the periphery of the second airtight blade 23, and when the second airtight blade 23 swings to a horizontal state, the second sealing ring 231 is tightly attached to the cavity wall of the air inflow cavity 102; the peripheral wall of the rotating shaft 21 is provided with a limit pin 211, the inner wall of the airtight sleeve is provided with two limit blocks 4 at intervals along the circumferential direction of the rotating shaft 21, when the first airtight blade 22 swings to the horizontal state, the limit pin 211 is abutted against one limit block 4, and when the second airtight blade 23 swings to the horizontal state, the limit pin 211 is abutted against the other limit block 4.
The rotation angle of the rotating shaft 21 can be limited through the abutting relation between the two limit blocks 4 and the limit pin 211, so that the swing angles of the first airtight blade 22 and the second airtight blade 23 are limited, the stable maintenance of an exhaust state and an air inlet state is ensured, and the sealing reliability is improved; by means of the attachment of the first sealing ring 221 and the air outflow cavity 101 and the attachment of the second sealing ring 231 and the air inflow cavity 102, the sealing effect of the air inflow cavity 102 in the exhaust state and the sealing effect of the air outflow cavity 101 in the intake state can be improved, and further the air tightness of the whole vehicle is improved.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 1 and fig. 2, the blocking member 10 includes two baffles obliquely extending along the axial direction of the airtight tube 1, and the two baffles form flaring structures at both ends of the air outflow cavity 101. When the inside atmospheric pressure of automobile body is higher than external atmospheric pressure, the inside air current of automobile body can be guided to the flaring structure of automobile body inside and flow out chamber 101 towards the inside air current of automobile body, thereby can promote airtight subassembly 2 and swing smoothly and open air outflow chamber 101, when the inside atmospheric pressure of automobile body is less than external atmospheric pressure, the flaring structure towards the external world can guide external air current to get into air outflow chamber 101, thereby it swings to push airtight subassembly 2 reverse under the internal and external pressure difference effect of automobile body, thereby seal air outflow chamber 101, air inflow chamber 102 is opened, can improve airtight subassembly 2 to the internal and external reaction sensitivity of pressure difference of automobile body through setting up the flaring structure, make airtight subassembly 2 can in time change between exhaust state and the state of admitting air according to the internal and external pressure difference condition of automobile body, thereby improve the inside atmospheric pressure comfort level of automobile body.
In the present embodiment, referring to fig. 1 and fig. 2, two baffles are respectively located at two sides of the hermetic component 2, and the end walls of the two baffles close to each other are both in sealing contact with the hermetic component 2. Through being located airtight subassembly 2 both sides two baffles and sealing up with airtight subassembly 2 respectively and contradict, can realize that the air flows into the sealed isolated between chamber 102 and the air outflow chamber 101, and because airtight subassembly 2 can pass and make both ends extend to air outflow chamber 101 and air inflow chamber 102 respectively from the position between two baffles in, the space between two baffles also can be suitable for airtight subassembly 2 to swing, avoids airtight subassembly 2 and baffle to take place to interfere and influence the swing sensitivity of airtight subassembly 2.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. An airtight structure capable of keeping airtightness of a whole motor train unit is characterized by comprising:
the air-tight pipe body is embedded in an exhaust hole of the vehicle body and is used for communicating the interior of the vehicle body with the outside; the inner cavity of the airtight pipe body is divided into an air outflow cavity and an air inflow cavity which are distributed at intervals along the radial direction of the airtight pipe body through a blocking piece; the cross section area of the air outflow cavity is larger than that of the air inflow cavity, the blocking piece comprises two baffle plates which obliquely extend along the axial direction of the airtight tube body respectively, and the two baffle plates enable the two ends of the air outflow cavity to form flaring structures;
the airtight assembly is rotatably 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 assembly includes:
the two ends of the rotating shaft are respectively and rotatably connected with the side wall of the airtight pipe body, and the peripheral wall of the rotating shaft is in sealing contact with the blocking piece;
the first airtight blade is positioned in the air outflow cavity, is fixedly connected with the rotating shaft and is used for opening or closing the air outflow cavity;
the second airtight blade is positioned in the air inflow cavity, is fixedly connected with the rotating shaft, forms an included angle structure with the first airtight blade, and is used for opening or closing the air inflow cavity;
the first airtight blade and the second airtight blade form an obtuse angle, and when the air exhaust state is carried out, the area of the air outflow cavity, which is covered by the first airtight blade along the axial direction of the airtight pipe body, is larger than that of the second airtight blade.
2. The airtight structure for maintaining the overall airtightness based on the motor train unit according to claim 1, wherein a limiting ring is disposed on an inner wall of the airtight tube, the second airtight blade is in sealing abutment with the limiting ring in the exhaust state, and the first airtight blade is in sealing abutment with the limiting ring in the intake state.
3. The airtight structure for maintaining the overall airtight performance based on the motor train unit as claimed in claim 2, wherein said spacing ring is located between an end of said airtight tube body facing the interior of said motor train unit and said rotating shaft.
4. The airtight structure for maintaining the airtight performance of the whole motor train unit according to claim 3, wherein a sealing felt pad is disposed on a side wall of the limiting ring facing the rotating shaft.
5. The airtight structure for maintaining the airtight performance of the whole motor train unit according to claim 1, wherein two of said baffles are respectively located at two sides of said airtight assembly, and the end walls of the two baffles close to each other are in sealing interference with said airtight assembly.
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