An inflatable sealed plug door for railway passenger cars

Abstract

The present invention relates to the technical field of plug doors for railway passenger cars, and discloses a plug door for inflatable-sealed railway passenger cars, which includes a base frame and a car door. A driving mechanism is arranged on the base frame to drive the displacement of the car door to open and close the door on the base frame; an inflatable sealing strip is arranged on the base frame to inflate and seal the gap generated between the car door and the base frame when the door is closed. An air inflation cylinder is arranged on the inflatable sealing strip, and an air outlet is arranged on the air inflation cylinder; a gas supply mechanism is also arranged on the base frame to drive the operation of the driving mechanism and inflate and deflate the inflatable sealing strip through the air inflation cylinder; a control mechanism and a locking mechanism are arranged on the air inflation cylinder to automatically stop inflation when the inflation of the inflatable sealing strip is completed; for the plug door of the inflatable-sealed railway passenger car, during inflatable sealing, the amount of air inflated into the sealing strip can be automatically controlled so that the degree of expansion of the sealing strip is as close as possible to the most suitable expansion amount affected by various comprehensive factors when the car door and the car body are sealed.

Description

Technical Field

[0001] The present invention relates to the technical field of plug doors for railway passenger cars, and particularly to a plug door for an inflated sealed railway passenger car. Background Art

[0002] The plug door for railway passenger cars is a type of door used in railway passenger carriages during normal operation. During the entire opening and closing process, there is a plugging action. When the door is closed, the outer surface of the door is flush with the outer skin of the car body, and when the door is opened, it overlaps with the car body. The advantages of the plug door are good airtightness, no occupation of the interior space of the car, and a safe and reliable locking mechanism, etc. Currently, most railway passenger cars use electro-pneumatic plug doors, which drive the opening and closing of the door body through the telescopic transmission of a cylinder. With the continuous increase in the speed of railway passenger cars, considering the large air pressure difference between the inside and outside of the car and to adapt to the operating environment of trains in high-altitude and cold regions, the airtightness of the plug door has become increasingly important. Common means to improve the airtightness of the plug door are lip seals and inflated sealing strips.

[0003] In the comparative document (CN202122670786.6), an embedded plug door support frame for a carriage is disclosed, which includes an upper shelf board, a lower shelf board, and a support board disposed between the upper shelf board and the lower shelf board. An activity slot one is formed in the support board, and a door body is disposed in the activity slot one. An inflated sealing strip one is disposed on the inner wall at the opening of the activity slot one, and a small inflator one is disposed in the support board. The output end of the small inflator one is connected to the inflated sealing strip one. The comparative document inflates the sealing strip through an inflator to make the sealing strip expand and seal the gap between the door and the car body.

[0004] However, it does not set up a corresponding inflation control function. Since the sealing strip is usually made of rubber and has strong expansion performance, in the actual use process, due to the process error during the manufacturing of the gap between the door and the car body and the comprehensive influence of factors such as the operating environment of the train during sealing, such as the air pressure difference and temperature difference between the inside and outside of the car, the appropriate degree of expansion required by the sealing strip is different, that is, the inflation amount is different. Therefore, in the absence of an inflation control function, insufficient inflation will result in insufficient airtightness, and excessive inflation may cause the sealing strip to rupture or jam the door. Summary of the Invention

[0005] The present invention provides an inflatable sealed plug door for railway passenger cars, which has the beneficial effect of automatically controlling the amount of air inflated into the sealing strip during inflatable sealing, so that the degree of expansion of the sealing strip is as close as possible to the most suitable expansion amount under the influence of comprehensive factors during the sealing of the door and the car body. It solves the problem mentioned in the above background technology that the existing inflatable sealed plug door for railway passenger cars lacks the corresponding air inflation control function. During actual use, due to the manufacturing process error between the door and the car body, and the comprehensive influence of factors such as the train operation environment during sealing, such as the air pressure difference and temperature difference inside and outside the car, the appropriate degree of expansion required for the sealing strip is different, that is, the amount of inflated air is different. Therefore, in the absence of an air inflation control function, insufficient inflation will result in insufficient sealing, and excessive inflation may cause the sealing strip to rupture or jam the door.

[0006] The present invention provides the following technical solution: An inflatable sealed plug door for railway passenger cars includes a base frame and a door. A driving mechanism is provided on the base frame to drive the displacement of the door to open and close the door on the base frame;

[0007] An inflatable sealing strip is provided on the base frame to inflate and seal the gap generated between the door and the base frame when the door is closed. An inflatable cylinder is provided on the inflatable sealing strip, and an air outlet is provided on the inflatable cylinder;

[0008] A gas supply mechanism is further provided on the base frame to drive the operation of the driving mechanism and to inflate and deflate the inflatable sealing strip through the inflatable cylinder;

[0009] A control mechanism and a locking mechanism are provided on the inflatable cylinder to automatically stop inflating when the inflatable sealing strip is fully inflated. The control mechanism includes an inner cylinder slidably disposed on the air outlet, and the locking mechanism is used to lock the position of the inner cylinder;

[0010] A sealing block is provided in the inner cylinder, and the sealing block is adapted to the air outlet. A sliding cylinder is also slidably disposed in the inner cylinder. When the gas in the inflatable sealing strip flows back after being full, the sliding cylinder is used to trigger the unlocking of the locking mechanism, so that the sealing block is displaced and inserted into the air outlet to stop inflating.

[0011] As an alternative solution of the inflatable sealed plug door for railway passenger cars of the present invention, wherein: An air injection port is further provided on the inflatable cylinder, and the control mechanism further includes a sealing groove opened on the air injection port;

[0012] The inner cylinder is slidably disposed in the sealing groove, a spring is provided on the inner cylinder, and the spring is connected to the inner wall of the sealing groove.

[0013] As an alternative solution for the inflatable sealed plug door of a railway passenger car according to the present invention, wherein: the locking mechanism includes a plug block slidably disposed on the inflatable cylinder, a slot is formed on the inner cylinder, and the plug block is movably inserted into the slot.

[0014] As an alternative solution for the inflatable sealed plug door of a railway passenger car according to the present invention, wherein: the locking mechanism further includes a chute formed on the inner cylinder, the chute is communicated with the slot, and the chute is adapted to the plug block;

[0015] A push rod is disposed on the sliding cylinder, and the push rod is slidably disposed on the inner cylinder.

[0016] As an alternative solution for the inflatable sealed plug door of a railway passenger car according to the present invention, wherein: the locking mechanism further includes a rotating rod rotatably disposed in the inflatable cylinder, a dial block is disposed on the rotating rod, and the dial block is adapted to the push rod;

[0017] The locking mechanism further includes a transmission rod, and both ends of the transmission rod are respectively movably hinged to the plug block and the dial block through hinge shafts;

[0018] Two torsion springs are disposed on the rotating rod, and both of the torsion springs are connected to the inner wall of the inflatable cylinder.

[0019] As an alternative solution for the inflatable sealed plug door of a railway passenger car according to the present invention, wherein: there are two locking mechanisms, and the two locking mechanisms are symmetrically disposed on the inflatable cylinder.

[0020] As an alternative solution for the inflatable sealed plug door of a railway passenger car according to the present invention, wherein: the driving mechanism includes a link member rotatably disposed on the base frame, and the link member is connected to the door, and a sliding member is slidably disposed on the base frame;

[0021] The driving mechanism further includes a cylinder, and both ends of the cylinder are respectively connected to the link member and the sliding member.

[0022] As an alternative solution for the inflatable sealed plug door of a railway passenger car according to the present invention, wherein: there are two link members, and the two link members are symmetrically disposed on the base frame, and the two cylinders are connected by a fixed rod.

[0023] As an alternative solution for the inflatable sealed plug door of a railway passenger car according to the present invention, wherein: the air supply mechanism includes an air pump and an electromagnetic valve, the air pump and the electromagnetic valve are connected through an air supply pipeline, a third air path pipeline is disposed on the electromagnetic valve, and the third air path pipeline is connected to the air injection port.

[0024] As an alternative solution for an inflatable sealing plug door of a railway passenger car according to the present invention, wherein: the air supply mechanism further includes a first air duct and a second air duct provided on the electromagnetic valve, and both the first air duct and the second air duct are connected to the air cylinder.

[0025] The present invention has the following beneficial effects:

[0026] 1. Compared with the traditional air supply mechanism that lacks automatic control function when supplying air to the inflatable sealing strip, this device realizes automatic control to stop inflation according to the appropriate degree of expansion required by the inflatable sealing strip, achieving an appropriate inflation volume. First, after the door is closed, the electromagnetic valve and the air pump operate, and gas is injected into the injection port through the third air duct, and then injected into the inflatable sealing strip through the inner cylinder and the air outlet. At this time, the air flow pushes the sliding cylinder in the inner cylinder towards the air outlet side.

[0027] At this time, the inflatable sealing strip begins to expand and fill the gap between the base frame and the door. Due to the manufacturing process and the influence of the internal and external air pressure difference and temperature field during the operation of the vehicle body, the size of the gap between the base frame and the door will change. When the inflatable sealing strip expands to near the maximum degree and begins to be squeezed by the base frame and the door, the gas inside it begins to flow back to the inflatable cylinder.

[0028] The backflow gas will push the sliding cylinder to displace towards the injection port side. At this time, the chute on the sliding cylinder will push the dial block and drive the plug block to be pulled out of the slot through the transmission, releasing the fixation of the inner cylinder. At this time, the inner cylinder will pop out towards the air outlet under the elastic force of the spring, and the sealing block will be inserted into the air outlet to block it, stopping the inflation.

[0029] 2. When the door of this inflatable sealing plug door of a railway passenger car is opened, it is necessary to deflate the inflatable sealing strip first. First, the air pump is used to pump air, so that the inner cylinder moves towards the injection port. At this time, the plug block first slides along the chute until the slot on the inner cylinder is displaced to fit with the plug block, and then the plug block is re-inserted into the slot under the elastic force of the two torsion springs to fix the inner cylinder.

[0030] 3. In the air supply mechanism of this inflatable sealing plug door of a railway passenger car, the air pump delivers gas through an electromagnetic valve structure with multiple passages, which can not only connect the air supply pipe with the first air duct or the second air duct to drive the expansion and contraction of the air cylinder to realize the opening and closing of the door.

[0031] It can also realize the inflation and deflation of the inflatable sealing strip by connecting the air supply pipe with the third air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0033] Figure 2 is Figure 1 The partial enlarged view at position A in

[0034] Figure 3 The schematic diagram of the internal structure at the air pump of the present invention.

[0035] Figure 4 is Figure 3 The partial enlarged view at position B in

[0036] Figure 5 The exploded structure schematic diagram at the air pump of the present invention.

[0037] In the figure: 1, base frame; 2, car door; 3, drive mechanism; 301, connecting rod; 302, sliding part; 303, cylinder; 304, fixed rod; 4, inflatable seal strip; 401, air pump; 402, air outlet; 403, air injection port; 5, air supply mechanism; 501, air pump; 502, solenoid valve; 503, air supply pipeline; 504, first air path pipeline; 505, second air path pipeline; 506, third air path pipeline; 6, control mechanism; 601, sealing groove; 602, inner cylinder; 603, sliding cylinder; 604, sealing block; 605, spring; 7, locking mechanism; 701, insertion block; 702, insertion slot; 703, sliding groove; 704, push rod; 705, rotating rod; 706, dialing block; 707, transmission rod; 708, torsion spring. Specific embodiments

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Embodiment 1

[0040] When the base frame 1 and the car door 2 are closed, affected by the process errors during their manufacturing and assembly, and the train operation environment during sealing, such as factors like the air pressure difference and temperature difference inside and outside the car, the appropriate degree of expansion required for the inflatable seal strip 4 used between the base frame 1 and the car door 2 is different. A simple inflation system may result in too little or too much inflation, both of which affect the sealing performance. Therefore, an automatic inflation function needs to be provided for the inflatable seal strip 4 to achieve the best expansion degree as much as possible. For this purpose, Embodiment 1 is proposed;

[0041] Please refer to Figures 1-5, An inflatable sealed plug door for a railway passenger car, comprising a base frame 1 and a door 2. A driving mechanism 3 is arranged on the base frame 1 to drive the displacement of the door 2 to open and close the door on the base frame 1;

[0042] An inflatable sealing strip 4 is arranged on the base frame 1 to inflate and seal the gap generated between the door 2 and the base frame 1 when the door is closed. An inflatable cylinder 401 is arranged on the inflatable sealing strip 4, and an air outlet 402 is arranged on the inflatable cylinder 401;

[0043] A gas supply mechanism 5 is also arranged on the base frame 1 to drive the operation of the driving mechanism 3 and inflate and deflate the inflatable sealing strip 4 through the inflatable cylinder 401;

[0044] A control mechanism 6 and a locking mechanism 7 are arranged on the inflatable cylinder 401 to automatically stop inflation when the inflation of the inflatable sealing strip 4 is completed. The control mechanism 6 includes an inner cylinder 602 slidably arranged on the air outlet 402, and the locking mechanism 7 is used to lock the position of the inner cylinder 602;

[0045] A sealing block 604 is arranged in the inner cylinder 602, and the sealing block 604 is adapted to the air outlet 402. A sliding cylinder 603 is also slidably arranged in the inner cylinder 602. When the gas in the inflatable sealing strip 4 flows back after being filled, the sliding cylinder 603 is used to trigger the unlocking of the locking mechanism 7, so that the sealing block 604 is displaced and inserted into the air outlet 402 to stop inflation;

[0046] An air injection port 403 is also arranged on the inflatable cylinder 401, and the control mechanism 6 also includes a sealing groove 601 opened on the air injection port 403;

[0047] The inner cylinder 602 is slidably arranged in the sealing groove 601, and a spring 605 is arranged on the inner cylinder 602, and the spring 605 is connected to the inner wall of the sealing groove 601.

[0048] In this embodiment: The base frame 1 is a plug door bearing component installed on the vehicle body. The door 2 is driven by the driving mechanism 3 to open and close on the base frame 1. When the door 2 is closed on the base frame 1, the inflatable sealing strip 4 installed on the base frame 1 can be inflated through the gas supply mechanism 5 to expand and fill the gap between the base frame 1 and the door 2.

[0049] The inflatable cylinder 401 installed on the inflatable sealing strip 4 is the channel for injecting gas. The inflatable cylinder 401 is a hollow cylinder. An air outlet 402 is installed on the part of it located inside the inflatable sealing strip 4, and an air injection port 403 is installed on the part located outside the inflatable sealing strip 4. A sealing groove 601 is opened at one end of the air injection port 403 close to the inside of the inflatable cylinder 401.

[0050] A inner cylinder 602 is slidably installed in the sealing groove 601. The inner cylinder 602 is also a hollow cylinder, and the inner cylinder 602 is also slidably installed on the air outlet 402. Corresponding sealing structures can be added to ensure the sealing performance between the inner cylinder 602, the air outlet 402 and the gas injection port 403.

[0051] One end of a spring 605 is fixed to the inner wall of the sealing groove 601, and the other end of the spring 605 is fixed to the inner cylinder 602. The inner cylinder 602 is fixed by a locking mechanism 7. At this time, the spring 605 is in a compressed state. A sliding cylinder 603 is also slidably installed in the inner cylinder 602, and a sealing block 604 is fixedly installed.

[0052] During use, gas is injected into the gas injection port 403 through the gas supply mechanism 5, then enters the inner cylinder 602, and finally is output from the air outlet 402. When starting to inject gas, the sliding cylinder 603 will be driven by the air flow towards the air outlet 402. When the inflatable sealing strip 4 inflates according to the gap between the base frame 1 and the vehicle door 2 and approaches the maximum degree, the gas starts to flow backward, thereby pushing the sliding cylinder 603 towards the gas injection port 403.

[0053] At this time, the sliding cylinder 603 triggers the unlocking of the locking mechanism 7, so that the inner cylinder 602 pops out towards the air outlet 402 under the huge elastic force of the spring 605, and the sealing block 604 is movably inserted into the air outlet 402 to block the air outlet 402 and stop gas injection.

[0054] It should be supplemented that at this time, devices such as force sensors can be correspondingly installed in the inflatable cylinder 401. After the inner cylinder 602 displaces and the sealing block 604 blocks the air outlet 402, the gas supply mechanism 5 is controlled to stop gas injection by using the induction signal.

[0055] Embodiment 2

[0056] To fix the position of the inner cylinder 602, Embodiment 2 is proposed;

[0057] This embodiment is an improved description based on Embodiment 1. Specifically, please refer to Figures 3-5 , the locking mechanism 7 includes a plug 701 slidably arranged on the inflatable cylinder 401. A slot 702 is formed on the inner cylinder 602, and the plug 701 is movably inserted into the slot 702.

[0058] In this embodiment: A plug 701 is slidably installed on the inflatable cylinder 401. A slot 702 is formed on the surface of the inner cylinder 602. The position of the inner cylinder 602 can be fixed by the plug 701 being movably inserted into the slot 702.

[0059] Embodiment 3

[0060] In order to enable the slide cylinder 603 to release the fixing of the inner cylinder 602 by the locking mechanism 7 under the effect of gas backflow, embodiment 2 is proposed;

[0061] This embodiment is an improvement made on the basis of embodiment 2. For details, please refer to Figures 3-5 The locking mechanism 7 further includes a slide groove 703 formed on the inner cylinder 602, the slide groove 703 is connected to the slot 702, and the slide groove 703 is matched with the insert block 701;

[0062] A push rod 704 is disposed on the slide cylinder 603, and the push rod 704 is slidably disposed on the inner cylinder 602;

[0063] The locking mechanism 7 further includes a rotating rod 705 rotatably disposed in the inflator 401 , a shifting block 706 is disposed on the rotating rod 705 , and the shifting block 706 is adapted to the push rod 704 ;

[0064] The locking mechanism 7 also includes a transmission rod 707, and both ends of the transmission rod 707 are respectively hinged to the insert block 701 and the shift block 706 through hinge shafts;

[0065] Two torsion springs 708 are disposed on the rotating rod 705 , and both torsion springs 708 are connected to the inner wall of the inflation cylinder 401 .

[0066] In this embodiment, a push rod 704 is fixed on the slide cylinder 603, and the push rod 704 is slidably installed in the notch on the surface of the inner cylinder 602. A rotating rod 705 is rotatably installed on the inner walls of both sides of the inflatable cylinder 401, and a folded line-shaped shifting block 706 is fixed on the rotating rod 705. One end of two torsion springs 708 are respectively fixed on the inner walls of both sides of the inflatable cylinder 401, and the other ends of the two torsion springs 708 are fixed on the rotating rod 705.

[0067] One end of the transmission rod 707 is hinged on the shifting block 706, and the other end is hinged on the inserting block 701. A corresponding sealing mechanism can be added between the slide cylinder 603 and the inner cylinder 602 to maintain the sealing. When the slide cylinder 603 drives the push rod 704 to move toward the gas injection port 403, the push rod 704 will touch the shifting block 706.

[0068] The shifting block 706 is shifted to rotate the rotating rod 705 , and the insertion block 701 is moved upward by the transmission of the transmission rod 707 and pulled out of the slot 702 , so that the inner cylinder 602 is ejected toward the air outlet 402 under the elastic force of the spring 605 .

[0069] When the insertion block 701 is pulled out, it can also slide along the sliding groove 703. When the air supply mechanism 5 starts to extract the gas in the inflatable sealing strip 4 through the air injection port 403, the inner cylinder 602 will move towards the air injection port 403 under the suction force. At this time, the slot 702 is displaced to fit with the insertion block 701. Under the resilience of the two torsion springs 708, the insertion block 701 drives the insertion block 701 to move downward through transmission and re-engage.

[0070] Embodiment 4

[0071] In order to make the inner cylinder 602 fixed more firmly and the force balanced, Embodiment 4 is proposed;

[0072] This embodiment is an improved description based on Embodiment 1. Specifically, please refer to Figures 3-5 , the locking mechanism 7 is provided with two, and the two locking mechanisms 7 are symmetrically arranged on the inflatable cylinder 401.

[0073] In this embodiment: Two locking mechanisms 7 are symmetrically arranged above and below the inflatable cylinder 401 and the inner cylinder 602. Through the engagement and fixation of the two insertion blocks 701, the inner cylinder 602 is fixed more firmly.

[0074] Embodiment 5

[0075] In order to control the opening and closing of the car door 2 on the base frame 1, Embodiment 5 is proposed;

[0076] This embodiment is an improved description based on Embodiment 1. Specifically, please refer to Figures 1-2 , the driving mechanism 3 includes a connecting rod member 301 rotatably arranged on the base frame 1, and the connecting rod member 301 is connected to the car door 2. A sliding member 302 is slidably arranged on the base frame 1;

[0077] The driving mechanism 3 further includes a cylinder 303, and both ends of the cylinder 303 are respectively connected to the connecting rod member 301 and the sliding member 302;

[0078] There are two connecting rod members 301, and the two connecting rod members 301 are symmetrically arranged on the base frame 1. The two cylinders 303 are connected by a fixing rod 304.

[0079] In this embodiment: Two connecting rod members 301 are rotatably installed on the upper and lower sides of the base frame 1. The other ends of the two connecting rod members 301 are both hinged to the car door 2. A sliding member 302 is slidably installed in the upper side slide rail of the base frame 1, and one end of the sliding member 302 is also hinged to the car door 2.

[0080] One end of the cylinder 303 is hinged to the connecting rod member 301, and the piston rod of the cylinder 303 is hinged to the sliding member 302. The telescopic movement of the cylinder 303 can drive the door 2 to open and close. At this time, the sliding member 302 slides along the upper side rail of the base frame 1, and the connecting rod member 301 rotates accordingly, causing the door 2 to slide open. It does not slide in a straight line and is flush with the surface of the vehicle body when closing the door. When opening the door, it folds into the vehicle body, reducing the occupied space inside the vehicle.

[0081] Two connecting rod members 301 are provided to make the force on the door 2 balanced, and the two connecting rod members 301 are driven through the fixing rod 304 fixed to them.

[0082] Regarding the specific structure and working principle of the base frame 1, the door 2 and the driving mechanism 3, they are common prior arts of the plug door for railway passenger cars, and will not be elaborated too much. For details, reference can be made to the comparative document CN02220473.3, an inflatable sealed plug door for railway passenger cars.

[0083] Embodiment 6

[0084] To drive the telescopic movement of the cylinder 303 and to inflate and deflate the inflatable sealing strip 4, Embodiment 6 is proposed;

[0085] This embodiment is an improved description based on Embodiment 1. Specifically, please refer to Figures 1-2 , the air supply mechanism 5 includes an air pump 501 and a solenoid valve 502. The air pump 501 and the solenoid valve 502 are connected through an air supply pipeline 503. A third air pipeline 506 is provided on the solenoid valve 502, and the third air pipeline 506 is connected to the air injection port 403;

[0086] The air supply mechanism 5 further includes a first air pipeline 504 and a second air pipeline 505 provided on the solenoid valve 502, and both the first air pipeline 504 and the second air pipeline 505 are connected to the cylinder 303.

[0087] In this embodiment: The air pump 501 can both inflate and deflate. When the solenoid valve 502 operates to control the connection between the air supply pipeline 503 and the second air pipeline 505, gas is injected into one end of the piston rod of the cylinder 303 through the second air pipeline 505, causing the cylinder 303 to extend. When the air supply pipeline 503 is connected to the first air pipeline 504, gas can be injected into the other end of the piston rod of the cylinder 303, causing the cylinder 303 to contract.

[0088] When the solenoid valve 502 controls the connection between the air supply pipeline 503 and the third air pipeline 506, the inflation and deflation of the inflatable sealing strip 4 can be controlled.

[0089] The above air pump 501, solenoid valve 502, etc. are all prior arts well-known to those skilled in the art, and their specific working principles will not be elaborated too much.

[0090] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0091] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A pneumatic sealed plug door for railway passenger cars, comprising a base frame (1) and a car door (2), characterized in that: A driving mechanism (3) is provided on the base frame (1) to drive the displacement of the vehicle door (2) to open and close the door on the base frame (1); An inflatable sealing strip (4) is provided on the base frame (1) to inflate and seal the gap generated between the vehicle door (2) and the base frame (1) when the door is closed. An inflator (401) is provided on the inflatable sealing strip (4), and an air outlet (402) is provided on the inflator (401); A gas supply mechanism (5) is further provided on the base frame (1) to drive the operation of the driving mechanism (3) and inflate and deflate the inflatable sealing strip (4) through the inflator (401); A control mechanism (6) and a locking mechanism (7) are provided on the inflator (401) to automatically stop inflation when the inflatable sealing strip (4) is fully inflated. The control mechanism (6) includes an inner cylinder (602) slidably disposed on the air outlet (402), and the locking mechanism (7) is used to lock the position of the inner cylinder (602); A sealing block (604) is disposed inside the inner cylinder (602), and the sealing block (604) is adapted to the air outlet (402). A sliding cylinder (603) is also slidably disposed inside the inner cylinder (602). As the gas in the inflatable sealing strip (4) flows back after being full, the sliding cylinder (603) triggers the unlocking of the locking mechanism (7), so that the sealing block (604) is displaced and inserted into the air outlet (402) to stop inflation.

2. The inflatable seal type plug door for railway passenger cars according to claim 1, characterized in that: An air injection port (403) is further provided on the inflator (401), and the control mechanism (6) further includes a sealing groove (601) opened on the air injection port (403); The inner cylinder (602) is slidably disposed in the sealing groove (601). A spring (605) is provided on the inner cylinder (602), and the spring (605) is connected to the inner wall of the sealing groove (601).

3. A pneumatically sealed plug door for a railway passenger car according to claim 1, characterized in that: The locking mechanism (7) includes a plug (701) slidably disposed on the inflator (401). A slot (702) is opened on the inner cylinder (602), and the plug (701) is movably inserted into the slot (702).

4. The inflatable seal type plug door for railway passenger cars according to claim 3, characterized in that: The locking mechanism (7) further includes a sliding groove (703) opened on the inner cylinder (602). The sliding groove (703) communicates with the slot (702), and the sliding groove (703) is adapted to the plug (701); A push rod (704) is provided on the sliding cylinder (603), and the push rod (704) is slidably disposed on the inner cylinder (602).

5. The inflatable and sealed plug door for railway passenger cars according to claim 4, characterized in that: The locking mechanism (7) further includes a rotating rod (705) rotatably disposed inside the inflator (401). A dial block (706) is provided on the rotating rod (705), and the dial block (706) is adapted to the push rod (704); The locking mechanism (7) further includes a transmission rod (707). The two ends of the transmission rod (707) are respectively movably hinged to the plug (701) and the dial block (706) through hinge shafts; Two torsion springs (708) are provided on the rotating rod (705), and both of the two torsion springs (708) are connected to the inner wall of the inflator (401).

6. A pneumatically sealed plug door for railway passenger cars according to claim 1, characterized in that: Two locking mechanisms (7) are provided, and the two locking mechanisms (7) are symmetrically arranged on the inflator (401).

7. A pneumatically sealed plug door for railway passenger cars according to claim 2, characterized in that: The driving mechanism (3) includes a connecting rod member (301) rotatably arranged on the base frame (1), and the connecting rod member (301) is connected to the vehicle door (2). A sliding member (302) is slidably arranged on the base frame (1); The driving mechanism (3) further includes a cylinder (303), and both ends of the cylinder (303) are respectively connected to the connecting rod member (301) and the sliding member (302).

8. A pneumatically sealed plug door for railway passenger cars according to claim 7, characterized in that: Two connecting rod members (301) are provided, and the two connecting rod members (301) are symmetrically arranged on the base frame (1). The two cylinders (303) are connected by a fixing rod (304).

9. A pneumatically sealed plug door for railway passenger cars according to claim 7, characterized in that: The air supply mechanism (5) includes an air pump (501) and a solenoid valve (502). The air pump (501) and the solenoid valve (502) are connected by an air supply pipeline (503). A third air path pipeline (506) is provided on the solenoid valve (502), and the third air path pipeline (506) is connected to the air injection port (403).

10. A pneumatically sealed plug door for a railway passenger car according to claim 9, characterized in that: The air supply mechanism (5) further includes a first air path pipeline (504) and a second air path pipeline (505) provided on the solenoid valve (502), and both the first air path pipeline (504) and the second air path pipeline (505) are connected to the cylinder (303).

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