Leak-proof vacuum corrugated pipe

Abstract

The invention relates to the technical field of pipeline structures, in particular to a leakproof vacuum corrugated pipe which comprises a pipe body. The bottom plate is detachably connected with the pipe body; the mounting plate is arranged on the bottom plate, a mounting groove is formed in the mounting plate, a valve body is arranged in the mounting groove, an executing mechanism is arranged on the mounting plate, and the executing mechanism controls the valve body to be opened and closed; the sensor is electrically connected with the executing mechanism, the sensor is detachably connected with the mounting plate, and a positioning piece for fixing the sensor is arranged on the bottom plate; a mounting hole penetrating through the inner wall of the pipe body is formed in the pipe body, the bottom plate is connected with the inner wall of the mounting hole, and a sealing gasket is arranged at the joint of the inner wall of the mounting hole and the bottom plate. The pipe has the effects that the leakproofness of the pipe body is improved, and leakage is effectively prevented.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline structures, and in particular to a leakage-proof vacuum bellows. Background Art

[0002] At present, the bellows structure is mostly used for the discharge of gas and liquid circulation, because the bellows has good shock absorption and anti-deformation effects, and is widely used in petrochemical, electric power, water conservancy, fire protection and other industries. When the bellows is used for smoke circulation, due to the chimney effect of hot smoke, if a fire occurs, the smoke is easy to spread quickly.

[0003] In the related art, the leakage of smoke and other circulating substances is often blocked by the structure of bellows and valves. However, since smoke and other substances circulate and spread quickly, if they cannot be closed in time, it is easy to cause smoke leakage and fire spread, and there is a disadvantage of poor sealing effect. Summary of the invention

[0004] In view of the problems existing in the prior art, according to one aspect of the present application, a leakage-proof vacuum bellows is provided, comprising: a tube body; a base plate, which is detachably connected to the tube body; a mounting plate, which is arranged on the base plate, a mounting groove is provided on the mounting plate, a valve body is arranged in the mounting groove, an actuator is arranged on the mounting plate, and the actuator controls the opening and closing of the valve body; a sensor, which is electrically connected to the actuator, the sensor is detachably connected to the mounting plate, and a positioning piece for fixing the sensor is arranged on the base plate; a mounting hole is arranged on the tube body, which passes through the inner wall of the tube body, the base plate is connected to the inner wall of the mounting hole, and a sealing gasket is arranged at the connection between the inner wall of the mounting hole and the base plate.

[0005] Exemplarily, a through hole for the sensor to pass through is provided on the bottom plate, a movable plate is provided on the bottom plate, the movable plate can be movably mounted on the bottom plate to block or open the through hole, and a driving member for driving the movable plate to move is provided on the bottom plate; a movable groove is provided in the bottom plate, the movable plate is movably mounted in the movable groove, a first transverse groove is provided in the bottom plate, and the driving member includes a movable rod movably mounted in the first transverse groove, one end of the movable rod is connected to the movable plate to drive the movable plate to move along the movable groove.

[0006] Exemplarily, a driving groove is provided in the base plate, a first piston is movably installed in the driving groove, the driving groove is connected to the first transverse groove, and a second piston is provided at the end of the movable rod; a control groove is provided in the base plate, the first piston is connected to a driving rod, and the short plate of the driving rod extends into the control groove; a first turntable is provided in the control groove, a first arc groove is provided on the first turntable, a driving block cooperating with the first arc groove is provided at the end of the driving rod, and the first turntable drives the driving rod to move.

[0007] Exemplarily, a vertical groove is provided on the base plate, and the positioning member includes a positioning rod provided in the vertical groove, the top of the positioning rod extends to the outside of the base plate, a notch connected to the vertical groove is provided on the mounting plate, the sensor is provided in the notch, a card hole matching the end of the positioning rod is provided at the bottom of the sensor, and a first reset member is connected to the bottom of the positioning rod; a second transverse groove is provided in the base plate, a transverse rod is movably installed in the second transverse groove, a first magnet is provided on the top of the first piston, a second magnet is provided at one end of the transverse rod away from the positioning rod, and the magnetism of the first magnet and the second magnet on the side close to each other is opposite; an opening is provided on the positioning rod, and an inclined slope is provided on the top of the opening, and the inclination direction of the slope is inclined from top to bottom in a direction away from the transverse rod.

[0008] Exemplarily, a receiving groove is provided on one side of the notch, a reset plate is movably installed in the receiving groove, one end of the reset plate is connected to a second reset member, and the other end is abutted against the sensor, one end of the second reset member is connected to the inner wall of the receiving groove, and the other end is connected to the reset plate.

[0009] Exemplarily, a second turntable is also provided in the control groove, a second arc groove is provided on the second turntable, a limit rod is provided in the control groove, the limit rod is movably installed in the base plate, a driving block matching with the second arc groove is provided at one end of the limit rod, the second turntable drives the limit rod to move, the other end of the limit rod extends to the outside of the base plate, and the inner wall of the tube body is provided with a limit hole matching with the end of the limit rod.

[0010] Exemplarily, a guide rod is provided in the control groove, the guide rod passes through the first turntable and the second turntable, the axes of the guide rod, the first turntable and the second turntable coincide, the guide rod is movably installed in the control groove and moves along the axial direction of the guide rod; a guide groove is provided on the guide rod, and holes for the guide rod to pass through are opened on the first turntable and the second turntable, and a block cooperating with the guide groove is provided on the hole.

[0011] Exemplarily, an electric push rod is provided on the base plate to drive the guide rod to move, and the guide groove includes a first guide groove, a second guide groove and a third guide groove, the second guide groove is bent, and the bending direction is along the length direction of the guide rod and toward the circumferential direction of the guide rod, and the first guide groove and the third guide groove are arranged along the length direction of the guide rod.

[0012] Exemplarily, the first return member includes a first return spring, and the second return member includes a second return spring.

[0013] Exemplarily, the sensor includes a body and a temperature sensor.

[0014] The present application has at least the following technical effects: the sensor of the pipe body can be detachably mounted on the mounting plate, and can respond in a timely manner through the structure of the sensor, thereby controlling the actuator to close the valve body. When the valve body is closed, the leakage of smoke and other circulating substances in the pipe body can be effectively prevented, and the bottom plate structure for supporting the valve body and the mounting plate is connected to the pipe body through the mounting hole, and the connection is sealed by a sealing gasket, which further improves the airtightness of the structure and effectively prevents the leakage of smoke and other circulating substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the tube body in the embodiment of the present application.

[0016] Figure 2 It is a schematic cross-sectional view of the interior of the tube body in the embodiment of the present application.

[0017] Figure 3 for Figure 2 Enlarged schematic diagram of part A in the middle.

[0018] Figure 4 for Figure 2 Enlarged schematic diagram of part B in the middle.

[0019] Figure 5 This is a schematic diagram of the guide rod and turntable structure in the embodiment of the present application.

[0020] 1. The valve body is provided with a plurality of valve members, each of which is provided with a plurality of valves, and each of which is provided with a plurality of valves. The plurality of valves are provided with a plurality of valves, each of which is provided with a plurality of valves. The plurality of valves are provided with a plurality of valves, each of which is provided with a plurality of valves. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0022] like Figure 1-Figure 5 As shown, an embodiment of the present application provides a leak-proof vacuum bellows, characterized in that it includes: a tube body 1, a base plate 2, a mounting plate 3 and a sensor 4.

[0023] The bottom plate 2 is detachably connected to the tube body 1, the mounting plate 3 is arranged on the bottom plate 2, a mounting groove is provided on the mounting plate 3, a valve body 31 is arranged in the mounting groove, an actuator 32 is arranged on the mounting plate 3, and the actuator 32 controls the opening and closing of the valve body 31. The sensor 4 is electrically connected to the actuator 32, the sensor 4 is detachably connected to the mounting plate 3, a positioning piece for fixing the sensor 4 is arranged on the bottom plate 2, a mounting hole penetrating the inner wall of the tube body 1 is arranged on the tube body 1, the bottom plate 2 is connected to the inner wall of the mounting hole, and a sealing gasket is arranged at the connection between the inner wall of the mounting hole and the bottom plate 2.

[0024] In the embodiment of the present application, the sensor 4 in the tube body 1 can be detachably mounted on the mounting plate 3. The structure of the sensor 4 can respond in a timely manner, thereby controlling the actuator 32 to close the valve body 31. When the valve body 31 is closed, the leakage of smoke and other circulating substances in the tube body 1 can be effectively prevented. The bottom plate 2 structure for supporting the valve body 31 and the mounting plate 3 is connected to the tube body 1 through the mounting hole, and the connection is sealed by a sealing gasket, which further improves the airtightness of the structure, effectively prevents the leakage of smoke and other circulating substances, and has a good sealing effect.

[0025] It should be noted that Figure 1 The structure of the tube body 1 is only a schematic diagram of a part of the corrugated tube, and does not limit the actual shape of the corrugated tube, nor does it limit its specific shape (such as bending method, bending angle, size, etc.). When used, its shape can be selected and improved according to specific circumstances without affecting its internal structure. On the other hand, the tube body 1 in the present application can also be used as a connecting section between two adjacent sections of the corrugated tube.

[0026] Exemplarily, the bottom plate 2 is provided with a through hole 10 for the sensor 4 to pass through, and the bottom plate 2 is provided with a movable plate 5, which can be movably installed on the bottom plate 2 to block or open the through hole 10, and the bottom plate 2 is provided with a driving member for driving the movable plate 5 to move.

[0027] Among them, the sensor 4 includes a main body and a temperature sensor. In some embodiments, the sensor 4 also includes a smoke sensor, which transmits the collected data to the control module. The control module controls the actuator 32 to control the valve body 31 to open or close, thereby achieving timely response to block the leakage.

[0028] The structures of the driving member and the positioning member in the embodiment of the present application are introduced below: A movable groove 21 is provided in the bottom plate 2, and the movable plate 5 is movably installed in the movable groove 21. A first transverse groove 23 is provided in the bottom plate 2. The driving member includes a movable rod 22 movably installed in the first transverse groove 23. One end of the movable rod 22 is connected to the movable plate 5 to drive the movable plate 5 to move along the movable groove 21. A driving groove 24 is provided in the bottom plate 2. A first piston 61 is movably installed in the driving groove 24. The driving groove 24 is connected to the first transverse groove 23. A second piston 62 is provided at the end of the movable rod 22. A control groove 29 is provided in the bottom plate 2. The first piston 61 is connected to the driving rod 6. The short plate of the driving rod 6 extends into the control groove 29. A first rotating disk 8 is provided in the control groove 29. A first arc groove 81 is provided on the first rotating disk 8. A driving block matching the first arc groove 81 is provided at the end of the driving rod 6. The first rotating disk 8 drives the driving rod 6 to move.

[0029] The first turntable 8 in the control groove 29 cooperates with the driving rod 6 through the first arc groove 81. When the first turntable 8 rotates, it will act on the driving rod 6 through the arc groove, so that the driving rod 6 moves horizontally. The driving rod 6 drives the first piston 61 to move. The first piston 61 changes the air pressure in the driving groove 24 and the first transverse groove 23, and acts on the second piston 62 through the air pressure, thereby driving the movable rod 22 to move horizontally. The movable rod 22 can drive the movable plate 5 to move horizontally when moving, thereby realizing the opening and closing of the through hole 10. The through hole 10 is closed during normal use, and the through hole 10 is opened when the sensor 4 needs to be installed and disassembled, so as to facilitate the installation and disassembly of the through hole 10.

[0030] Exemplarily, a second rotating disk 9 is also provided in the control groove 29, a second arc groove 91 is provided on the second rotating disk 9, a limiting rod 92 is provided in the control groove 29, the limiting rod 92 is movably installed in the bottom plate 2, a driving block is provided at one end of the limiting rod 92 to cooperate with the second arc groove 91, the second rotating disk 9 drives the limiting rod 92 to move, the other end of the limiting rod 92 extends to the outside of the bottom plate 2, and a limiting hole 93 is provided on the inner wall of the tube body 1 to cooperate with the end of the limiting rod 92. A guide rod 7 is provided in the control groove 29, the guide rod 7 passes through the first rotating disk 8 and the second rotating disk 9, the axes of the guide rod 7, the first rotating disk 8 and the second rotating disk 9 coincide, the guide rod 7 is movably installed in the control groove 29 and moves along the axis direction of the guide rod 7; a guide groove is provided on the guide rod 7, a hole for the guide rod 7 to pass through is provided on the first rotating disk 8 and the second rotating disk 9, and a block is provided on the hole to cooperate with the guide groove.

[0031] The guide rod 7 in the control groove 29 is used to drive the first turntable 8 and the second turntable 9. The holes on the first turntable 8 and the second turntable 9 cooperate with the guide rod 7. When the guide rod 7 moves vertically, the first turntable 8 and the second turntable 9 can be driven, and the linear motion of the guide rod 7 can be converted into the circumferential rotation of the first turntable 8 and the second turntable 9. As mentioned above, when the first turntable 8 rotates, the movable rod 22 and the movable plate 5 can be driven. When the second turntable 9 rotates, the limiting rod 92 will be driven to move horizontally through the second arc groove 91. When the end of the limiting rod 92 and the limiting hole 93 cooperate, the limit between the bottom plate 2 and the tube body 1 can be achieved. When the end of the limiting rod 92 and the limiting hole 93 are separated, the separation between the bottom plate 2 and the tube body 1 can be achieved. Exemplarily, in order to ensure the sealing of the tube body 1, a sealing gasket (not shown in the figure) is provided at the connection between the bottom plate 2 and the tube body 1. Exemplarily, the first turntable 8 is located above the second turntable 9.

[0032] Among them, an electric push rod 74 for driving the guide rod 7 to move is arranged on the base plate 2, and the guide grooves include a first guide groove 71, a second guide groove 72 and a third guide groove 73. The second guide groove 72 is bent, and the bending direction is along the length direction of the guide rod 7 and toward the circumferential direction of the guide rod 7. The first guide groove 71 and the third guide groove 73 are arranged along the length direction of the guide rod 7.

[0033] When the electric push rod 74 is working, it drives the guide rod 7 so that the guide rod 7 moves along its own axis in the vertical direction, thereby cooperating with the first turntable 8 and the second turntable 9 through the guide groove. The guide groove is divided into a first guide groove 71, a second guide groove 72 and a third guide groove 73, wherein the first guide groove 71 and the third guide groove 73 are linear grooves. When the first turntable 8 or the second turntable 9 cooperates with the first guide groove 71 and the third guide groove 73, the movement of the guide rod 7 will not drive the corresponding turntable. When the second guide groove 72 cooperates with the first turntable 8 and the second turntable 9, the first turntable 8 and the second turntable 9 will be driven. In addition, because the entire bottom plate 2 does not need to be disassembled when the sensor 4 is disassembled and installed, and only the second guide groove 72 is curved, the first turntable 8 and the second turntable 9 cannot rotate at the same time. When the second guide groove 72 on the guide rod 7 cooperates with the first turntable 8, the movable rod 22 and the movable plate 5 can be driven to move, but at this time, the third guide groove 73 cooperates with the second turntable 9 and cannot drive the limit rod 92. The end of the limit rod 92 still cooperates with the tube body 1. When the second guide groove 72 on the guide rod 7 cooperates with the second turntable 9, the limit rod 92 can be driven. At this time, the first guide groove 71 cooperates with the first turntable 8 and does not drive the movable rod 22.

[0034] Exemplarily, a vertical groove 42 is provided on the base plate 2, and the positioning member includes a positioning rod 41 arranged in the vertical groove 42, the top of the positioning rod 41 extends to the outside of the base plate 2, a notch 33 connected to the vertical groove 42 is provided on the mounting plate 3, the sensor 4 is arranged in the notch 33, and a card hole matching the end of the positioning rod 41 is provided at the bottom of the sensor 4, and a first reset member 43 is connected to the bottom of the positioning rod 41; a second transverse groove 25 is provided in the base plate 2, a transverse rod 26 is movably installed in the second transverse groove 25, a first magnet 27 is provided on the top of the first piston 61, and a second magnet 28 is provided at one end of the transverse rod 26 away from the positioning rod 41, and the magnetic properties of the first magnet 27 and the second magnet 28 are opposite to each other; an opening is provided on the positioning rod 41, and an inclined slope is provided on the top of the opening, and the inclination direction of the slope is from top to bottom inclination in the direction away from the transverse rod 26.

[0035] Among them, a receiving groove 34 is set on one side of the notch 33, and a reset plate 35 is movably installed in the receiving groove 34. One end of the reset plate 35 is connected to the second reset member 36, and the other end is against the sensor 4. One end of the second reset member 36 is connected to the inner wall of the receiving groove 34, and the other end is connected to the reset plate 35.

[0036] The positioning rod 41 is movably installed in the vertical groove 42 and driven by the transverse rod 26. A second magnet 28 is provided at the end of the transverse rod 26, and a first magnet 27 is provided on the first piston 61. When the first piston 61 moves, the transverse rod 26 is driven to move horizontally under the action of magnetic force. After the transverse rod 26 moves away from the positioning rod 41, it will separate from the positioning rod 41. Under the action of the first reset member 43, the positioning rod 41 will move downward, and the top of the positioning rod 41 and the clamping hole on the sensor 4 will separate. Under the action of the reset plate 35, the sensor 4 will pop out from the mounting plate 3, so that it is convenient to disassemble. In addition, when the first piston 61 moves, it will drive the transverse rod 26 and the movable rod 22 at the same time. When the transverse rod 26 moves in the direction away from the positioning rod 41, the movable rod 22 will also drive the movable plate 5 to move, so that the through hole 10 is opened, so that it is convenient to take out the sensor 4 for replacement and maintenance or replace the battery.

[0037] The following is an explanation of how this application works: Under normal circumstances, the movable plate 5 blocks the through hole 10 on the bottom plate 2. When the sensor 4 needs to be disassembled, the guide rod 7 is driven to move vertically downward under the action of the electric push rod 74. The third guide groove 73 on the guide rod 7 first contacts the first turntable 8, and the second guide groove 72 acts on the first turntable 8 to drive the first turntable 8 to rotate. When the first turntable 8 rotates, it acts on the driving rod 6 through the first arc groove 81, so that the driving rod 6 moves horizontally. At the same time, the first piston 61 on the driving rod 6 moves and changes the air pressure in the driving groove 24 and the first transverse groove 23, so that the second piston 62 on the movable rod 22 and the movable rod 22 move horizontally. When the movable rod 22 approaches the driving groove 24, it drives the movable plate 5 to move and open the through hole 10. After the through hole 10 is opened, it is convenient to disassemble the sensor 4.

[0038] On the other hand, when the first piston 61 moves, the magnetic force drives the transverse rod 26 to move horizontally. After the transverse rod 26 moves away from the positioning rod 41, it separates from the positioning rod 41. Under the action of the first reset member 43, the positioning rod 41 moves downward, and the top of the positioning rod 41 separates from the clamping hole on the sensor 4. Under the action of the reset plate 35, the sensor 4 pops out from the mounting plate 3, thereby facilitating disassembly. The movement of the movable plate 5 to open the through hole 10 allows the sensor 4 to be disassembled smoothly.

[0039] Afterwards, if it is necessary to disassemble the base plate 2, the guide rod 7 is driven to continue to move downward, and the second guide groove 72 cooperates with the second turntable 9. When the second turntable 9 rotates, the limit rod 92 is driven to move horizontally through the second arc groove 91. When the end of the limit rod 92 and the limit hole 93 are separated, the base plate 2 and the tube body 1 can be disassembled, thereby facilitating the disassembly of the entire base plate 2.

[0040] In summary, in the bellows in the embodiment of the present application, the sensor 4 can be detachably mounted on the mounting plate 3. When the control valve body 31 is closed, the leakage of smoke and other circulating substances in the tube body 1 can be effectively prevented. The through hole 10 on the bottom plate 2 can be driven to open by the driving member, and the sensor 4 and the mounting plate 3 can be disassembled through the positioning member. The sensor 4 can be taken out through the through hole 10 for maintenance, replacement and other operations. While ensuring good airtightness to prevent leakage, the efficiency of disassembly and installation of the sensor 4 is effectively improved.

[0041] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A leak-proof vacuum bellows, characterized in that: include: tube body(1); A bottom plate (2), wherein the bottom plate (2) is detachably connected to the tube body (1); A mounting plate (3), the mounting plate (3) being arranged on the bottom plate (2), the mounting plate (3) being provided with a mounting groove, a valve body (31) being arranged in the mounting groove, an actuator (32) being arranged on the mounting plate (3), and the actuator (32) controlling the opening and closing of the valve body (31); A sensor (4), the sensor (4) being electrically connected to the actuator (32), the sensor (4) being detachably connected to the mounting plate (3), and a positioning member for fixing the sensor (4) being provided on the base plate (2); The tube body (1) is provided with a mounting hole penetrating the inner wall of the tube body (1); the bottom plate (2) is connected to the inner wall of the mounting hole; and a sealing gasket is provided at the connection between the inner wall of the mounting hole and the bottom plate (2).

2. The leak-proof vacuum bellows according to claim 1, characterized in that: The bottom plate (2) is provided with a through hole for the sensor (4) to pass through, the bottom plate (2) is provided with a movable plate (5), the movable plate (5) can be movably mounted on the bottom plate (2) to block or open the through hole, and the bottom plate (2) is provided with a driving member for driving the movable plate (5) to move; a movable groove (21) is provided in the bottom plate (2), the movable plate (5) is movably mounted in the movable groove (21), a first transverse groove (23) is provided in the bottom plate (2), and the driving member comprises a movable rod (22) movably mounted in the first transverse groove (23), one end of the movable rod (22) is connected to the movable plate (5) to drive the movable plate (5) to move along the movable groove (21).

3. The leak-proof vacuum bellows according to claim 2, characterized in that: A driving groove (24) is provided in the base plate (2), a first piston (61) is movably installed in the driving groove (24), the driving groove (24) is connected to the first transverse groove (23), and a second piston (62) is provided at the end of the movable rod (22); a control groove (29) is provided in the base plate (2), the first piston (61) is connected to a driving rod (6), and the short plate of the driving rod (6) extends into the control groove (29); a first rotating disk (8) is provided in the control groove (29), a first arc groove (81) is provided on the first rotating disk (8), a driving block cooperating with the first arc groove (81) is provided at the end of the driving rod (6), and the first rotating disk (8) drives the driving rod (6) to move.

4. The leak-proof vacuum bellows according to claim 3, characterized in that: The bottom plate (2) is provided with a vertical groove (42), the positioning member comprises a positioning rod (41) arranged in the vertical groove (42), the top of the positioning rod (41) extends to the outside of the bottom plate (2), the mounting plate (3) is provided with a notch (33) connected to the vertical groove (42), the sensor (4) is arranged in the notch (33), the bottom of the sensor (4) is provided with a clamping hole matched with the end of the positioning rod (41), and the bottom of the positioning rod (41) is connected to a first reset member (43); a positioning rod (41) is provided in the bottom plate (2) A second transverse groove (25) is provided, a transverse rod (26) is movably installed in the second transverse groove (25), a first magnet (27) is arranged on the top of the first piston (61), a second magnet (28) is arranged on the end of the transverse rod (26) away from the positioning rod (41), and the first magnet (27) and the second magnet (28) have opposite magnetic properties on the sides close to each other; an opening is provided on the positioning rod (41), and an inclined slope is provided on the top of the opening, and the inclination direction of the slope is inclined from top to bottom in a direction away from the transverse rod (26).

5. The leak-proof vacuum bellows according to claim 4, characterized in that: A receiving groove (34) is provided on one side of the notch (33), a reset plate (35) is movably installed in the receiving groove (34), one end of the reset plate (35) is connected to a second reset member (36), and the other end abuts against the sensor (4), one end of the second reset member (36) is connected to the inner wall of the receiving groove (34), and the other end is connected to the reset plate (35).

6. The leak-proof vacuum bellows according to claim 4, characterized in that: A second rotating disk (9) is also arranged in the control groove (29), and a second arc groove (91) is arranged on the second rotating disk (9). A limiting rod (92) is arranged in the control groove (29), and the limiting rod (92) is movably installed in the bottom plate (2). A driving block cooperating with the second arc groove (91) is arranged at one end of the limiting rod (92), and the second rotating disk (9) drives the limiting rod (92) to move, and the other end of the limiting rod (92) extends to the outside of the bottom plate (2), and the inner wall of the tube body (1) is provided with a limiting hole (93) cooperating with the end of the limiting rod (92).

7. The leak-proof vacuum bellows according to claim 6, characterized in that: A guide rod (7) is arranged in the control groove (29), and the guide rod (7) passes through the first turntable (8) and the second turntable (9). The axes of the guide rod (7), the first turntable (8) and the second turntable (9) coincide with each other. The guide rod (7) is movably installed in the control groove (29) and moves along the axis direction of the guide rod (7). A guide groove is arranged on the guide rod (7), and holes for the guide rod (7) to pass through are opened on the first turntable (8) and the second turntable (9), and a block cooperating with the guide groove is arranged on the hole.

8. The leak-proof vacuum bellows according to claim 7, characterized in that: The bottom plate (2) is provided with an electric push rod (74) for driving the guide rod (7) to move; the guide groove comprises a first guide groove (71), a second guide groove (72) and a third guide groove (73); the second guide groove (72) is bent in a direction along the length direction of the guide rod (7) and toward the circumferential direction of the guide rod (7); the first guide groove (71) and the third guide groove (73) are arranged along the length direction of the guide rod (7).

9. The leak-proof vacuum bellows according to claim 6, characterized in that: The first return member (43) includes a first return spring, and the second return member (36) includes a second return spring.

10. A leak-proof vacuum bellows according to any one of claims 1 to 9, characterized in that: The sensor (4) comprises a body and a temperature sensor.

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