Improved high-temperature superconducting maglev traffic track board assembly

Abstract

The invention provides an improved high-temperature superconducting maglev traffic track board assembly which comprises a track board and an adjusting mechanism, and the adjusting mechanism can adjust the height of a track board body. A pair of permanent magnet rails is fixedly connected to the rail plate, a pair of emergency walking plates is fixedly connected to the top face of the rail plate, a traction rail is fixedly connected to the top face of the rail plate, a linear motor can be installed on the traction rail, and a set of large pedestals are arranged below the rail plate body. According to the improved high-temperature superconductive maglev traffic track board assembly, whether the track board body is high in smoothness or not is measured by means of the ball, if the track board body is inclined, the ball slides in the sliding groove and makes contact with the contact, and then the alarm gives an alarm; and then the height of the track board body can be adjusted through the adjusting mechanism, so that the high smoothness of the track board body after installation is improved, and the track board can be widely applied to the technical field of traffic tracks.

Description

Technical Field

[0001] The invention relates to the technical field of transportation track technology, and in particular to an improved high-temperature superconducting magnetic suspension transportation track plate assembly. Background Art

[0002] High-temperature superconducting maglev transportation track plate technology is the core component serving maglev trains. It uses the superconducting properties of high-temperature superconducting materials (such as YBCO) under liquid nitrogen cooling to achieve stable suspension and guidance of trains on the track through the Meissner effect and flux pinning effect. The track plate is embedded with permanent magnets, which interact with the superconducting material at the bottom of the train to provide suspension and guidance forces to ensure the smooth operation of the train.

[0003] However, the above technology often has the following defects: the current track plate assembly has very high requirements on its installation accuracy during assembly. The track plate assembly needs to have high smoothness and also needs to be flush with other track plates. In order to avoid the problem of installation accuracy difficulties, the present invention provides an improved high-temperature superconducting magnetic levitation transportation track plate assembly. Summary of the invention

[0004] The embodiment of the present application provides an improved high-temperature superconducting magnetic levitation transportation track plate assembly, which is intended to address the issues mentioned in the background technology section. The core is to solve the problems raised, thereby playing a role in adjusting the track plate assembly.

[0005] In order to solve the above technical problems, the technical solution proposed in this application is:

[0006] The present invention provides an improved high-temperature superconducting magnetic levitation transportation track plate assembly, comprising a track plate and an adjustment mechanism, wherein the adjustment mechanism can adjust the height of the track plate body; a pair of permanent magnet tracks are fixedly connected to the track plate, a pair of emergency walking plates are fixedly connected to the top surface of the track plate, and a traction track is fixedly connected to the top surface of the track plate, and a linear motor can be installed on the traction track; a group of large pedestals are arranged below the track plate body, a pair of small pedestals are arranged on the bottom surface of the central part of the track plate body, and the adjustment mechanism is arranged on the large pedestals and the small pedestals; a connecting block is fixedly connected to the side wall of the track plate, a slide groove is provided in the connecting block, and a round ball is slidably connected in the slide groove; an alarm is fixedly connected to the top surface of the connecting block, and contacts are fixedly connected on both sides of the inner wall of the slide groove, and the alarm can be activated when the round ball contacts the contacts.

[0007] Furthermore, a rectangular groove is provided on the top surface of the inner wall of the slide groove, and the top surface of the connecting block is slidably connected to a limit plate extending into the slide groove. The limit plate is arc-shaped and can limit the ball. A pair of first springs are fixedly connected between the top surface of the limit plate and the rectangular groove.

[0008] Furthermore, a pair of slots are provided on the side walls of the connecting rod, a movable slot corresponding to the slot is provided in the connecting block, a block engaged with the slot is slidably connected in the movable slot, a second spring is fixedly connected between the side of the block away from the slot and the inner wall of the movable slot, a circular groove is provided on the top of the connecting rod, a magnetic rod is slidably connected in the circular groove, a third spring is fixedly connected between the bottom surface of the magnetic rod and the inner wall of the circular groove, and the block is made of magnetic material that repels the magnetic rod.

[0009] Furthermore, a cavity is opened in the connection block, an air intake component for injecting red gas into the cavity is arranged on the connection block, a group of air outlet holes connected with the cavity are opened on both sides of the connection block, and a sealing component for sealing the air outlet holes is arranged on the connection block.

[0010] Furthermore, the sealing assembly includes a connecting groove provided in the connecting block, the connecting groove is connected to the air outlet, a sealing plate for sealing the air outlet is slidably connected in the connecting groove, and a through hole corresponding to the air outlet is provided on the sealing plate.

[0011] Furthermore, the sealing assembly also includes a hollow groove opened in the connecting plate, a connected air inlet groove is opened between the hollow groove and the connecting groove, a magnetic plate is sealingly and slidingly connected in the hollow groove, a fourth spring is fixedly connected between the side of the magnetic plate away from the contact and the inner wall of the hollow groove, and the ball is made of a material that repels the magnetic plate.

[0012] Furthermore, a driving plate is sealingly and slidably connected to the inner wall of the cavity, and a fifth spring is fixedly connected between the bottom surface of the driving plate and the inner wall of the cavity.

[0013] Furthermore, the adjustment mechanism includes grooves provided in the large pedestal and the small pedestal, a hydraulic rod is provided in the groove, an output end of the hydraulic rod is fixedly connected to an adjustment plate, and the adjustment plate contacts the bottom surface of the track plate body.

[0014] Furthermore, the air intake assembly includes an air intake pipe vertically arranged on the connecting block, the air outlet end of the air intake pipe is arranged in a cavity, the driving plate is sealingly and slidingly connected to the surface of the air intake pipe, and the air outlet end of the air intake pipe is twisted with a one-way plate that seals it through a torsion spring.

[0015] Compared with the prior art, the improved high-temperature superconducting magnetic levitation transportation track plate assembly of the present invention has achieved the following beneficial technical effects:

[0016] 1. The present invention uses a ball to measure whether the track plate body is highly smooth. If the track plate body is tilted, the ball will slide in the slide groove and make contact with the contact point. At this time, the alarm will sound, and then the height of the track plate body can be adjusted through the adjustment mechanism to improve the high smoothness of the track plate body after installation.

[0017] 2. In the present invention, before the track plate body is assembled, the first spring can be used to push the limit plate so that the limit plate limits the ball to prevent the ball from sliding in the slide groove and accidentally triggering the alarm. During the assembly of the track plate body, the connecting rod can be moved upward so that the limit plate no longer contacts the ball. At this time, the ball can be used to detect whether the track plate body is in a high smoothness state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the track plate assembly in the present invention;

[0020] Figure 2 yes Figure 1 The schematic diagram of the structure after the track plate body is removed;

[0021] Figure 3 It is a structural schematic diagram of the connection block in the present invention;

[0022] Figure 4 It is a schematic diagram of the internal structure of the connection block in the present invention;

[0023] Figure 5 yes Figure 4 A schematic diagram of the structure at A;

[0024] Figure 6 yes Figure 4 Schematic diagram of the structure at B;

[0025] Figure 7 It is a structural schematic diagram of the air intake assembly in the present invention.

[0026] In the figure: 1. Track plate body; 2. Traction track; 3. Permanent magnet track; 4. Emergency walking plate; 5. Large pedestal; 6. Small pedestal; 7. Adjustment plate; 8. Connecting block; 9. Alarm; 10. Slide; 11. Contact; 12. Round ball; 13. Rectangular groove; 14. Connecting rod; 15. Limiting plate; 16. Moving groove; 17. Round groove; 18. Block; 19. Magnetic rod; 20. Cavity; 21. Air outlet; 22. Connecting groove; 23. Sealing plate; 24. Through hole; 25. Hollow groove; 26. Magnetic plate; 27. Drive plate; 28. Inlet pipe; 29. ​​One-way plate. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Embodiment 1: Figure 1 and Figure 6 As shown, an improved high-temperature superconducting magnetic levitation transportation track plate assembly of an embodiment of the present application includes a track plate and an adjustment mechanism, wherein the adjustment mechanism can adjust the height of the track plate body 1; a pair of permanent magnet tracks 3 are fixedly connected to the track plate, a pair of emergency walking plates 4 are fixedly connected to the top surface of the track plate, and a traction track 2 is fixedly connected to the top surface of the track plate, and a linear motor can be installed on the traction track 2; a group of large pedestals 5 are arranged below the track plate body 1, a pair of small pedestals 6 are arranged on the bottom surface of the central part of the track plate body 1, and the adjustment mechanism is arranged on the large pedestal 5 and the small pedestal 6; a connecting block 8 is fixedly connected to the side wall of the track plate, a slide groove 10 is opened in the connecting block 8, and a ball 12 is slidably connected in the slide groove 10; an alarm 9 is fixedly connected to the top surface of the connecting block 8, and contacts 11 are fixedly connected on both sides of the inner wall of the slide groove 10, and the alarm 9 can be activated when the ball 12 contacts the contact 11;

[0029] When the track plate body 1 in the present application is being installed, the ball 12 can be used to measure whether the track plate body 1 is highly smooth. If the track plate body 1 is tilted, the ball 12 will slide in the slide groove 10, allowing the ball 12 to contact the contact 11. At this time, the alarm 9 will sound an alarm, and then the height of the track plate body 1 can be adjusted through the adjustment mechanism to improve the high smoothness of the track plate body 1 after installation, thereby ensuring the smooth operation of the train. The traction rail 2 is the base of the linear motor, and a linear motor is arranged under the train. The train uses the traction rail 2 and the linear motor to provide traction and braking force to the vehicle. The emergency walking plate 4 can allow the train to run on the emergency walking plate 4 using walking wheels when a train fails.

[0030] A rectangular groove 13 is provided on the top surface of the inner wall of the slide groove 10, and a limit plate 15 extending into the slide groove 10 is slidably connected to the top surface of the connecting block 8. The limit plate 15 is arc-shaped and can limit the ball 12. A pair of first springs are fixedly connected between the top surface of the limit plate 15 and the rectangular groove 13; in the present application, before the track plate body 1 is assembled, the first spring can be used to push the limit plate 15 so that the limit plate 15 can limit the ball 12 to prevent the ball 12 from sliding in the slide groove 10 and accidentally triggering the alarm 9. During the assembly of the track plate body 1, the connecting rod 14 can be moved upward so that the limit plate 15 is no longer in contact with the ball 12. At this time, the ball 12 can be used to detect whether the track plate body 1 is in a high smoothness state.

[0031] A pair of slots are provided on the side wall of the connecting rod 14, a movable slot 16 corresponding to the slot is provided in the connecting block 8, a block 18 connected to the slot is slidably connected in the movable slot 16, a second spring is fixedly connected between the side of the block 18 away from the slot and the inner wall of the movable slot 16, a circular slot 17 is provided on the top of the connecting rod 14, a magnetic rod 19 is slidably connected in the circular slot 17, a third spring is fixedly connected between the bottom surface of the magnetic rod 19 and the inner wall of the circular slot 17, the The block 18 is made of a magnetic material that repels the magnetic rod 19; when the connecting rod 14 in the present application is pulled upward, the block 18 will be aligned with the position of the slot, and the second spring will push the block 18 to engage with the slot, thereby limiting the connecting rod 14. When it is necessary to limit the ball 12, the magnetic rod 19 can be pushed downward to make the magnetic rod 19 repel the block 18, thereby allowing the block 18 to disengage from the slot, and the first spring will push the limiting plate 15 to limit the ball 12.

[0032] A cavity 20 is provided in the connecting block 8, and an air intake assembly for injecting red gas into the cavity 20 is provided on the connecting block 8. A group of air outlet holes 21 connected to the cavity 20 are provided on both sides of the connecting block 8, and a sealing assembly for sealing the air outlet holes 21 is provided on the connecting block 8; the track plate body 1 in the present application may have a slightly smaller settlement displacement after long-term use. At this time, the ball 12 can also be used for daily monitoring of whether the track plate body 1 has settled and displaced, and then the track plate body 1 is fine-tuned through the adjustment mechanism, but the contacts 11 and the alarm 9 need maintenance during long-term use. If a fault occurs, the settlement displacement of the track plate body 1 cannot be detected in time. At this time, when the track plate body 1 has settled and displaced, the sealing assembly can no longer seal the air outlet holes 21. At this time, the red gas in the cavity 20 can be continuously discharged from the air outlet holes 21 to issue a warning, so that the track plate body 1 can be adjusted in time to ensure the smooth operation of the train.

[0033] The sealing assembly includes a connecting groove 22 provided in the connecting block 8, the connecting groove 22 is connected to the air outlet 21, a sealing plate 23 for sealing the air outlet 21 is slidably connected in the connecting groove 22, and a through hole 24 corresponding to the air outlet 21 is provided on the sealing plate 23; the present application can seal the air outlet 21 through the sealing plate 23, when the track plate body 1 sinks and displaces, the ball 12 will roll, and at this time the sealing mechanism can control the downward movement of the sealing plate 23, so that the through hole 24 is connected to the air outlet 21, and at this time the red gas in the cavity 20 can be discharged from the air outlet 21 for warning.

[0034] The sealing assembly also includes a hollow groove 25 opened in the connecting plate, a connected air inlet groove is opened between the hollow groove 25 and the connecting groove 22, a magnetic plate 26 is sealingly and slidably connected in the hollow groove 25, a fourth spring is fixedly connected between the side of the magnetic plate 26 away from the contact 11 and the inner wall of the hollow groove 25, and the ball 12 is made of a material that repels the magnetic plate 26; when the track plate body 1 in the present application undergoes a settlement displacement, the ball 12 will slide toward the side of the settlement displacement, and at this time the ball 12 will approach the magnetic plate 26, and the magnetic plate 26 will push the gas in the hollow groove 25 under the action of the repulsive force, so that the gas in the hollow groove 25 enters the connecting groove 22 from the air inlet groove, thereby pushing the through hole 24 on the sealing plate 23 to align with the air outlet 21, so that the red gas in the cavity 20 can be discharged.

[0035] The inner wall of the cavity 20 is sealed and slidably connected with a driving plate 27, and a fifth spring is fixedly connected between the bottom surface of the driving plate 27 and the inner wall of the cavity 20; in the present application, after the through hole 24 is aligned with the air outlet 21, the fifth spring will push the driving plate 27, so that the driving plate 27 pushes the red gas in the cavity 20, thereby accelerating the discharge speed of the red gas to increase the concentration of the red gas discharged, thereby improving the warning effect.

[0036] The adjustment mechanism includes grooves provided on the large pedestal 5 and the small pedestal 6, and a hydraulic rod is arranged in the groove. The output end of the hydraulic rod is fixedly connected with an adjustment plate 7, and the adjustment plate 7 contacts the bottom surface of the track plate body 1; when the ball 12 contacts the contact 11, the hydraulic rod will be started, so that the hydraulic rod drives the adjustment plate 7 to move. At this time, the adjustment plate 7 can adjust the track plate body 1 to make the track plate body 1 highly smooth.

[0037] Embodiment 2: Figure 7 As shown, compared with Example 1, another implementation of the present invention is: the air intake assembly includes an air intake pipe 28 vertically arranged on the connecting block 8, the air outlet end of the air intake pipe 28 is arranged in the cavity 20, the driving plate 27 is sealingly and slidingly connected with the surface of the air intake pipe 28, and the air outlet end of the air intake pipe 28 is twisted with a one-way plate 29 for sealing it through a torsion spring; the present application can inject red gas into the cavity 20 through the air intake pipe 28, and the red gas will push the one-way plate 29 to open during the injection process, and the red gas can enter the cavity 20 at this time. At this time, the gas can push the driving plate 27 to move downward, and after the injection of red gas stops, the one-way plate 29 will seal the air outlet end of the air intake pipe 28 under the action of the torsion spring.

[0038] Working principle: the ball 12 is used to measure whether the track plate body 1 is smooth. If the track plate body 1 is tilted, the ball 12 will slide in the slide groove 10, allowing the ball 12 to contact the contact 11. At this time, the alarm 9 will sound an alarm, and then the height of the track plate body 1 can be adjusted through the adjustment mechanism to improve the high smoothness of the track plate body 1 after installation, thereby ensuring the smooth operation of the train. The traction track 2 is the base of the linear motor, and a linear motor is arranged under the train. The train provides traction and braking force to the vehicle by the cooperation of the traction track 2 and the linear motor. The emergency walking plate 4 can allow the train to walk on the emergency walking plate 4 using walking wheels when a train fails; in this application, the track plate body 1 can push the limit plate 15 with the help of the first spring before it is assembled. The limiting plate 15 limits the ball 12 to prevent the ball 12 from sliding in the slide groove 10 and accidentally triggering the alarm 9. During the assembly of the track plate body 1, the connecting rod 14 can be moved upward so that the limiting plate 15 is no longer in contact with the ball 12. At this time, the ball 12 can be used to detect whether the track plate body 1 is in a high smoothness state; when the connecting rod 14 in the present application is pulled upward, the block 18 will be aligned with the position of the slot, and the second spring will push the block 18 to engage with the slot, thereby limiting the connecting rod 14. When it is necessary to limit the ball 12, the magnetic rod 19 can be pushed downward so that the magnetic rod 19 and the block 18 repel each other, thereby allowing the block 18 to detach from the slot. At this time, the first spring will push the limiting plate 15 to limit the ball 12.

[0039] The track plate body 1 in the present application may have a slightly smaller settlement displacement after long-term use. At this time, the ball 12 can also be used for daily monitoring of whether the track plate body 1 has settled and displaced, and then the track plate body 1 can be fine-tuned through the adjustment mechanism. However, the contact 11 and the alarm 9 need to be maintained during long-term use. If a fault occurs, the settlement displacement of the track plate body 1 cannot be discovered in time. At this time, when the track plate body 1 settles and displaces, the sealing component can no longer seal the air outlet 21. At this time, the red gas in the cavity 20 can be continuously discharged from the air outlet 21 to issue a warning, so that the track plate body 1 can be adjusted in time to ensure the smooth operation of the train; the present application can be implemented through the sealing plate 23 The air outlet 21 is sealed. When the track plate body 1 is displaced by settling, the ball 12 will roll. At this time, the sealing mechanism can control the downward movement of the sealing plate 23, so that the through hole 24 is connected with the air outlet 21. At this time, the red gas in the cavity 20 can be discharged from the air outlet 21 for warning; when the track plate body 1 in the present application is displaced by settling, the ball 12 will slide to the side of the settling displacement. At this time, the ball 12 will approach the magnetic plate 26. The magnetic plate 26 will push the gas in the hollow groove 25 under the action of the repulsive force, so that the gas in the hollow groove 25 enters the connecting groove 22 from the air inlet groove, thereby pushing the through hole 24 on the sealing plate 23 to align with the air outlet 21, so that the red gas in the cavity 20 can be discharged;

[0040] In the present application, after the through hole 24 is aligned with the air outlet 21, the fifth spring will push the driving plate 27, so that the driving plate 27 pushes the red gas in the cavity 20, thereby accelerating the discharge speed of the red gas to increase the concentration of the red gas discharge, thereby improving the warning effect; in the present application, when the ball 12 contacts the contact 11, the hydraulic rod will be started, so that the hydraulic rod drives the adjustment plate 7 to move. At this time, the adjustment plate 7 can adjust the track plate body 1 to make the track plate body 1 highly smooth.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An improved high-temperature superconducting magnetic levitation transportation track plate assembly, comprising a track plate and an adjustment mechanism, wherein the adjustment mechanism can adjust the height of the track plate body (1); Features: A pair of permanent magnet tracks (3) are fixedly connected to the track plate, a pair of emergency walking plates (4) are fixedly connected to the top surface of the track plate, and a traction track (2) is fixedly connected to the top surface of the track plate, and a linear motor can be installed on the traction track (2); A group of large pedestals (5) are arranged below the track plate body (1), a pair of small pedestals (6) are arranged on the bottom surface of the central part of the track plate body (1), and the adjustment mechanism is arranged on the large pedestals (5) and the small pedestals (6); A connecting block (8) is fixedly connected to the side wall of the track plate, a sliding groove (10) is provided in the connecting block (8), and a ball (12) is slidably connected in the sliding groove (10); The top surface of the connection block (8) is fixedly connected with an alarm (9), and both sides of the inner wall of the slide groove (10) are fixedly connected with contacts (11), and the alarm (9) can be activated when the ball (12) contacts the contacts (11).

2. The improved high-temperature superconducting magnetic levitation transportation track plate assembly according to claim 1 is characterized in that: A rectangular groove (13) is provided on the top surface of the inner wall of the slide groove (10); a limit plate (15) extending into the slide groove (10) is slidably connected to the top surface of the connecting block (8); the limit plate (15) is arc-shaped and can limit the ball (12); a pair of first springs are fixedly connected between the top surface of the limit plate (15) and the rectangular groove (13).

3. The improved high-temperature superconducting magnetic levitation transportation track plate assembly according to claim 2 is characterized in that: A pair of slots are provided on the side wall of the connecting rod (14); a movable slot (16) corresponding to the slot is provided in the connecting block (8); a block (18) engaged with the slot is slidably connected in the movable slot (16); a second spring is fixedly connected between a side of the block (18) away from the slot and an inner wall of the movable slot (16); a circular slot (17) is provided at the top of the connecting rod (14); a magnetic rod (19) is slidably connected in the circular slot (17); a third spring is fixedly connected between the bottom surface of the magnetic rod (19) and the inner wall of the circular slot (17); and the block (18) is made of a magnetic material that repels the magnetic rod (19).

4. The improved high-temperature superconducting magnetic levitation transportation track plate assembly according to claim 3 is characterized in that: A cavity (20) is provided in the connection block (8), an air intake assembly for injecting red gas into the cavity (20) is provided on the connection block (8), a group of air outlet holes (21) in communication with the cavity (20) are provided on both sides of the connection block (8), and a sealing assembly for sealing the air outlet holes (21) is provided on the connection block (8).

5. The improved high-temperature superconducting magnetic levitation transportation track plate assembly according to claim 4 is characterized in that: The sealing assembly comprises a connecting groove (22) provided in the connecting block (8), the connecting groove (22) being in communication with the air outlet (21), a sealing plate (23) for sealing the air outlet (21) being slidably connected in the connecting groove (22), and a through hole (24) corresponding to the air outlet (21) being provided on the sealing plate (23).

6. The improved high-temperature superconducting magnetic levitation transportation track plate assembly according to claim 5, characterized in that: The sealing assembly also includes a hollow groove (25) provided in the connecting plate, an air inlet groove communicating with the connecting groove (22), a magnetic plate (26) being sealingly and slidably connected in the hollow groove (25), a fourth spring being fixedly connected between a side of the magnetic plate (26) away from the contact point (11) and an inner wall of the hollow groove (25), and the spherical ball (12) being made of a material that repels the magnetic plate (26).

7. The improved high-temperature superconducting magnetic levitation transportation track plate assembly according to claim 6, characterized in that: The inner wall of the cavity (20) is sealingly and slidably connected to a driving plate (27), and a fifth spring is fixedly connected between the bottom surface of the driving plate (27) and the inner wall of the cavity (20).

8. The improved high-temperature superconducting magnetic levitation transportation track plate assembly according to claim 1 is characterized in that: The adjustment mechanism comprises grooves provided on the large pedestal (5) and the small pedestal (6), a hydraulic rod being arranged in the groove, an adjustment plate (7) being fixedly connected to the output end of the hydraulic rod, and the adjustment plate (7) being in contact with the bottom surface of the track plate body (1).

9. The improved high-temperature superconducting magnetic levitation transportation track plate assembly according to claim 7, characterized in that: The air intake assembly comprises an air intake pipe (28) vertically arranged on a connecting block (8), an air outlet end of the air intake pipe (28) being arranged in a cavity (20), the driving plate (27) being sealingly slidably connected to the surface of the air intake pipe (28), and a one-way plate (29) for sealing the air outlet end of the air intake pipe (28) being twisted with a torsion spring.

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