Non-contact vacuum pump driving device based on centrifugation and magnetic force transmission

Abstract

The utility model relates to the technical field of vacuum pumps, and discloses a non-contact vacuum pump driving device based on centrifugation and magnetic force transmission, which comprises a motor, a bottom shell and a pump body, and the output end of the motor is connected with a shaft rod of the pump body through a connecting seat; the moving frame is located in the bottom shell and connected with the spring; the outer sides of the magnetic ring and the connecting base are connected with a magnetic assembly, when the motor is not driven, the spring enables the moving frame to be located at the initial position, when the motor is driven, the magnetic assembly is opened under centrifugal force and gets close to the magnetic ring, the magnetic ring is driven by magnetic force to enable the moving frame to move, and at the moment, the sealing cover connected with the moving frame blocks the pressure relief opening of the bottom shell. According to the utility model, the motor drives the connecting seat to rotate to generate centrifugal force, so that the magnet is close to the magnetic ring, the magnetic force is utilized to extrude the magnetic ring to realize transmission and operation without mechanical contact, the collision and abrasion among mechanical parts are reduced, the vibration and noise are further reduced, the reliability of equipment is improved, the service life of the equipment is prolonged, and the operation stability and quietness are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vacuum pump technical field especially based on centrifugal and magnetic force transmission's non -contact vacuum pump drive arrangement. BACKGROUND

[0002] The vacuum pump is a kind of device for generating, improving and maintaining vacuum environment in certain closed space. Its main function is to reduce the gas pressure in space to a lower level by extracting gas or steam, to form a state similar to vacuum.

[0003] In the traditional vacuum pump device, mechanical transmission mechanism is used to control the opening and closing of sealing assembly. Although this mechanical transmission method is simple, but due to the long-term contact friction, it is easy to cause the wear of parts, the decline of sealing performance and the increase of noise and vibration. In addition, the wear of mechanical contact also produces small particles, which can cause pollution to some high cleanliness scenes, therefore, the non-contact vacuum pump drive device based on centrifugal and magnetic force transmission is proposed to solve the above problems. SUMMARY

[0004] In order to make up for the above shortcomings, the utility model provides a non-contact vacuum pump drive device based on centrifugal and magnetic force transmission, aiming at improving the problem that the traditional vacuum pump uses mechanical transmission mechanism to control the opening and closing of sealing assembly in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: the non-contact vacuum pump drive device based on centrifugal and magnetic force transmission comprises:

[0006] Motor, bottom shell and pump body, the motor output end is connected with the shaft rod of pump body through connecting seat, for transmitting motor power to make pump body run, and the air in bottom shell is extracted through pump body;

[0007] Movement frame, which is located in the bottom shell and connected with the spring, the spring is between the motor and the bottom shell, for driving the movement frame to move by elastic potential energy to reset the movement frame;

[0008] Magnetic ring, which is connected with the movement frame, the connecting seat outside is connected with magnetic force assembly, when the motor is not driven, the spring makes the movement frame in initial position, when the motor is driven, the magnetic force assembly is opened by centrifugal force and close to the magnetic ring, the movement frame is displaced by magnetic force driven magnetic ring, at this time, the sealing cover connected with the movement frame blocks the pressure relief port of the bottom shell.

[0009] As a further description of the above technical scheme:

[0010] The magnetic force assembly comprises a support one and a support two, one side of the support two is rotationally connected with the outer wall of the connecting seat, the support one is fixedly connected with the support two, and a weight block is arranged in the support one, and a magnet is arranged in the support two.

[0011] As a further description of the above technical solution:

[0012] The support one and the support two are combined to be provided with an L-shaped cross section, and the bottom shell and the motor are connected through screws.

[0013] As a further description of the above technical solution:

[0014] The bottom shell is internally provided with a cavity, and is externally provided with an air outlet, and the pressure relief port, the cavity and the air outlet are communicated.

[0015] As a further description of the above technical solution:

[0016] The inner wall of the bottom shell is fixedly provided with a guide rod, the middle portion of the moving frame is provided with a guide hole, and the guide rod is slidably connected in the guide hole.

[0017] As a further description of the above technical solution:

[0018] The bottom shell is provided with an opening near the motor side, and the connecting seat and the spring are arranged in the opening.

[0019] As a further description of the above technical solution:

[0020] The magnetic poles of the magnet and the magnetic ring near the same side are the same, the moving frame is provided with a clamping groove on the side close to the spring, one side of the spring is arranged in the clamping groove, the other side is in contact with the motor, and the sealing cover is arranged outside the pressure relief port.

[0021] As a further description of the above technical solution:

[0022] The magnetic poles of the magnet and the magnetic ring near the same side are different, the two sides of the spring are fixedly arranged in the inner wall of the clamping groove and the outer portion of the motor, respectively, the two support ones are close to each other through the tension spring, and the sealing cover is arranged inside the pressure relief port.

[0023] The utility model has the advantages of the following:

[0024] 1. In the utility model, the centrifugal force generated by the motor driving the connecting seat rotation makes the magnet close to the magnetic ring, the magnetic force between the magnet and the magnetic ring is used to extrude the magnetic ring, the device realizes the transmission and operation without mechanical contact, effectively avoids the wear and failure caused by direct contact in the traditional mechanical device, and the non-contact transmission mode can effectively reduce the direct collision between mechanical parts, reduce vibration and noise, greatly improve the reliability and service life of the equipment, and improve the stability and quietness of the equipment operation.

[0025] 2. In the utility model, by utilizing the interaction of magnetic force and centrifugal force, the non-contact operation is realized, the magnetic force transmission mode does not need lubrication or additional maintenance support, the requirement for the use environment is lower, the operation difficulty and maintenance complexity are greatly reduced, and the disadvantages of high maintenance and high cost in the traditional mechanical transmission are effectively solved.

[0026] 3. In the utility model, the opening and closing function of the vacuum pump is realized by utilizing the interaction between the magnet and the magnetic ring, the dependence on the electromagnetic valve in the traditional design is avoided, the volume of the device is greatly reduced, the occupied space is reduced, so that the equipment is more compact, at the same time, the use of the electromagnetic valve is saved, not only simplifies the structure, but also reduces the installation complexity and maintenance cost.

[0027] 4. In the utility model, the magnetic pole configuration of the magnet and the magnetic ring realizes two sealing modes, when the magnetic poles are the same, the same repulsion of the magnet is used to extrude the magnetic ring, the moving frame drives the sealing cover to close the top of the pressure relief port, when the magnetic poles are different, the different attractive action of the magnet and the magnetic ring pulls the magnetic ring, the moving frame drives the sealing cover to block the inside of the pressure relief port, so as to provide flexible sealing mode to adapt to different scene requirements. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The utility model provides a three-dimensional structure schematic diagram of the non-contact vacuum pump driving device based on centrifugal and magnetic force transmission;

[0029] Figure 2 The utility model provides a bottom shell part structure split drawing of the non-contact vacuum pump driving device based on centrifugal and magnetic force transmission;

[0030] Figure 3 The utility model provides a moving frame part structure split drawing of the non-contact vacuum pump driving device based on centrifugal and magnetic force transmission;

[0031] Figure 4 The utility model provides a weight block part structure split drawing of the non-contact vacuum pump driving device based on centrifugal and magnetic force transmission;

[0032] Figure 5The utility model provides a right side section view of sealing cover of the embodiment one of the no contact vacuum pump drive arrangement based on centrifugal and magnetic force transmission of the utility model discloses.

[0033] Figure 6 It is the bottom shell internal structure schematic view in Figure 5 .

[0034] Figure 7 It is the magnetic ring part structure schematic view in Figure 5 .

[0035] Figure 8 The utility model provides a magnetic pole distribution of the embodiment one of the no contact vacuum pump drive arrangement based on centrifugal and magnetic force transmission of the utility model discloses. Figure 1 .

[0036] Figure 9 The utility model provides a magnetic pole distribution of the embodiment two of the no contact vacuum pump drive arrangement based on centrifugal and magnetic force transmission of the utility model discloses. Figure 2 .

[0037] Figure 10 The utility model provides a right side section view of sealing cover of the embodiment two of the no contact vacuum pump drive arrangement based on centrifugal and magnetic force transmission of the utility model discloses.

[0038] Figure 11 The utility model provides a magnetic pole distribution of the embodiment two of the no contact vacuum pump drive arrangement based on centrifugal and magnetic force transmission of the utility model discloses. Figure 1 .

[0039] Figure 12 The utility model provides a magnetic pole distribution of the embodiment two of the no contact vacuum pump drive arrangement based on centrifugal and magnetic force transmission of the utility model discloses. Figure 2 .

[0040] Legend:

[0041] 1, motor, 2, bottom shell, 3, pump body, 4, connecting seat, 5, support one, 6, support two, 7, weight block, 8, magnet, 9, moving frame, 10, spring, 11, magnetic ring, 12, sealing cover, 13, pressure relief port, 14, guide rod, 15, guide hole, 16, screw, 17, suction port, 18, clamping groove, 19, opening, 20, tension spring. Specific implementation

[0042] The technical scheme in the embodiments of the utility model will be described below with reference to the drawings in the utility model specification, apparently, the described embodiments only are a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without making the creative labor belong to the range of the utility model protection.

[0043] Referring to Figures 1-7 The utility model provides an embodiment: embodiment one

[0044] Referring to Figures 1-7 The embodiment of the application provides a contactless vacuum pump driving device based on centrifugal force and magnetic force transmission, which comprises a motor 1, a bottom shell 2 and a pump body 3, the output end of the motor 1 is connected with the shaft rod of the pump body 3 through a connecting seat 4, is used for transmitting the power of the motor 1 to make the pump body 3 run, and air in the bottom shell 2 is extracted through the pump body 3; a moving frame 9 is located in the bottom shell 2 and is connected with a spring 10, the spring 10 is located between the motor 1 and the bottom shell 2, is used for driving the moving frame 9 to move by elastic potential energy to reset the moving frame 9; a magnetic ring 11 is connected with the moving frame 9, a magnetic force assembly is connected outside the connecting seat 4, when the motor 1 is not driven, the spring 10 makes the moving frame 9 be in the initial position, when the motor 1 is driven, the magnetic force assembly is opened by centrifugal force and is close to the magnetic ring 11, the magnetic ring 11 is driven by magnetic force to displace the moving frame 9, and at this time, a sealing cover 12 connected with the moving frame 9 blocks the pressure relief port 13 of the bottom shell 2.

[0045] The motor 1 is used as a core driving component, the top of the motor 1 is connected with the bottom shell 2, the bottom shell 2 is used as the main structure of the device, the moving frame 9 is supported through the spring 10 at the bottom of the moving frame 9, the top of the moving frame 9 is provided with the magnetic ring 11 and is used for realizing the cooperative action with the magnetic force transmission, and one side of the bottom of the moving frame 9 is fixedly provided with the sealing cover 12, the sealing cover 12 is located above the pressure relief port 13 in the static state;

[0046] In the state that the motor 1 is not driven, the spring 10 is in the stretched state, the reaction force of the spring 10 lifts the moving frame 9, the moving frame 9 drives the magnetic ring 11 and the sealing cover 12 to move upwards, the sealing cover 12 is separated from the pressure relief port 13, and the open state of the pressure relief port 13 is maintained. When the motor 1 is started, the connecting seat 4 transmits the rotating power of the motor 1 to the magnetic force assembly through the position of the connecting seat 4 installed at the output end of the motor 1, so that the magnetic force assembly rotates together with the connecting seat 4. With the rotation, the magnetic force assembly is gradually opened, the magnetic ring 11 is pressed downwards by the magnetic force, the moving frame 9 moves downwards in the process and compresses the spring 10, so that the sealing cover 12 is attached to the inner wall of the bottom shell 2, and finally the sealing cover 12 seals the pressure relief port 13. Therefore, the contactless power transmission is realized by using the magnetic force, mechanical wear is effectively avoided, efficient sealing is realized, and the service life and operation reliability of the device are significantly improved.

[0047] Referring to Figures 2-7 The magnetic force assembly comprises a support one 5 and a support two 6, one side of the support two 6 is rotationally connected with the outer wall of the connecting seat 4, the support one 5 is fixedly connected with the support two 6, a weight block 7 is installed in the inside of the support one 5, a magnet 8 is installed in the inside of the support two 6, the support one 5 and the support two 6 are combined and the cross section is provided with an L shape, and the bottom shell 2 and the motor 1 are connected through a screw 16.

[0048] The magnetic force assembly is composed of bracket one 5 and bracket two 6, one side of bracket two 6 is rotatably connected with the top of the outer wall of the connecting seat 4 through a hinged manner, so that it can produce rotary motion under the action of centrifugal force. The bottom of bracket one 5 is fixedly connected with the top surface of bracket two 6, and the two form a stable structural combination for supporting and transmitting rotary motion. A weight block 7 is installed in the inside of bracket one 5, which produces an outward opening action when rotating under the action of centrifugal force; the inside of bracket two 6 is provided with a magnet 8 which cooperates with a magnetic ring 11 at the top of a moving frame 9;

[0049] When the device is running, with the rotation of the connecting seat 4, bracket one 5 and bracket two 6 gradually expand under the influence of centrifugal force, and the weight block 7 increases the action of centrifugal force, so that bracket two 6 and the magnet 8 gradually approach the magnetic ring 11. Because the same magnetic poles of the magnet 8 and the magnetic ring 11 are the same, the magnet 8 exerts a squeezing action on the magnetic ring 11 by using the magnetic force of repelling the same kind, thereby driving the moving frame 9 to move downward, and driving the sealing cover 12 to block the pressure relief port 13.

[0050] With reference to Figures 4-7 , the inside of the bottom shell 2 is provided with a cavity, and the outside is provided with a gas extraction port 17, and the pressure relief port 13, the cavity and the gas extraction port 17 are in communication, a guide rod 14 is fixed on the inner wall of the bottom shell 2, a guide hole 15 is formed in the middle of the moving frame 9, the guide rod 14 is slidably connected in the guide hole 15, and an opening 19 is formed on the side of the bottom shell 2 close to the motor 1, and the connecting seat 4 and the spring 10 are both in the opening 19.

[0051] The bottom surface of the inner wall of the bottom shell 2 is fixedly connected with the guide rod 14, and the guide rod 14 penetrates through the guide hole 15 formed in the middle of the outer side of the moving frame 9, and the two are connected in a sliding manner, so that the moving frame 9 is provided with accurate guiding action when moving up and down, preventing the moving frame 9 from deviating or shaking, and ensuring the stability and sealing precision in the moving process. Through the cooperation of the clamping groove 18 and the guide rod 14, the motion trajectory of the sealing cover 12 is further optimized while the stability of the moving frame 9 is improved, thereby ensuring the reliability and sealing effect of the vacuum pump;

[0052] And the bottom of the bottom shell 2 is designed with an opening 19, which is used to accommodate the connecting seat 4 and the spring 10, so that they are partially or entirely in the opening 19. Not only effectively saves the internal space of the bottom shell 2, but also ensures the flexible movement of the connecting seat 4 and the spring 10, which facilitates the overall structure of the device to be more compact and efficient. While the bottom of the bottom shell 2 is connected with the screw 16 through the threaded structure, the bottom of the screw 16 is threaded connected with the top of the motor 1. This connection mode ensures the close fixation between the bottom shell 2 and the motor 1, while providing the flexibility of easy disassembly, which is convenient for the assembly, maintenance and replacement of parts of the equipment. In addition, the top of the connecting seat 4 is directly connected with the shaft of the pump body 3, which ensures that the power output by the motor 1 is accurately transmitted to the shaft of the pump body 3 through the connecting seat 4, and then drives the normal work of the vacuum pump.

[0053] With reference to Figures 7-9 , the magnetic poles of the magnet 8 and the magnetic ring 11 near the same side are the same, the movement frame 9 is provided with a clamping groove 18 on the side close to the spring 10, one side of the spring 10 is in the clamping groove 18, and the other side is in contact with the motor 1, and the sealing cover 12 is located outside the pressure relief port 13.

[0054] The clamping groove 18 is located at the bottom of the movement frame 9, which is used to stabilize the top of the spring 10, so that the spring 10 can be accurately embedded in the clamping groove 18, thereby providing stable support force for the movement frame 9 when the spring 10 is stretched and retracted. The setting of the spring 10 not only makes the movement frame 9 be lifted in the static state, which ensures that the sealing cover 12 is separated from the air inlet 13, but also provides a reset function through its elasticity in the running process, which ensures that the movement frame 9 can efficiently complete the up and down movement.

[0055] Working principle: when the motor 1 is in a static state, i.e. the motor 1 is not driven, the spring 10 is in an extended state, the reaction force of the spring 10 lifts the moving frame 9, the moving frame 9 drives the magnetic ring 11 at the top and the sealing cover 12 to move upwards, at this time, the sealing cover 12 is separated from the pressure relief port 13 on the bottom shell 2, so that the pressure relief port 13 remains open, when the motor 1 is started, the motor 1 drives the connecting seat 4 through the output end, the connecting seat 4 drives the support one 5, the support two 6, the weight block 7 and the magnet 8 in the magnetic assembly to rotate, one side of the support two 6 is connected to the outer wall top of the connecting seat 4 through a hinged connection, therefore, with the high-speed rotation of the connecting seat 4, the centrifugal force makes the support one 5, the support two 6, the weight block 7 and the magnet 8 inside them rotate along the connecting seat 4 as the rotation axis, at this time, the weight block 7 and the magnet 8 move away from the connecting seat 4 and gradually approach the magnetic ring 11 at the top of the moving frame 9, because the magnetic poles of the magnet 8 and the magnetic ring 11 on the same side are different, the same magnetic poles repel each other, which can press the magnetic ring 11, so that the magnetic ring 11 drives the moving frame 9 to move downwards and compresses the spring 10, the guide rod and the guide hole 15 guide the moving frame 9 to move downwards, under the continuous action of the magnetic force, the moving frame 9 drives the sealing cover 12 at the bottom to move downwards and makes the sealing cover 12 adhere to the bottom surface of the inner wall of the bottom shell 2, so as to completely block the pressure relief port 13, at this time, the pump body 3 forms a closed system through sealing, then the gas enters the cavity inside the bottom shell 2 through the suction port 17, finally is discharged from the pump body 3, so as to realize the vacuumizing function, when the motor 1 stops working, the magnetic assembly stops rotating, the centrifugal force disappears, the support one 5 and the support two 6 return to the initial position under the action of the magnetic force of the magnet 8 and the magnetic ring 11, at this time, the magnet 8 moves away from the magnetic ring 11, at the same time, the spring 10 resets, lifts the moving frame 9 again, drives the magnetic ring 11 and the sealing cover 12 to move upwards, so that the sealing cover 12 is separated from the pressure relief port 13, at this time, the pressure relief port 13 is opened, and because the pump body 3 is provided with a one-way valve, the inside of the bottom shell 2 returns to an open state, and the atmosphere outside enters the bottom shell 2 through the pressure relief port 12.

[0056] Example two

[0057] With reference to Figures 10-12 , the magnetic poles of the magnet 8 and the magnetic ring 11 on the same side are different, the two sides of the spring 10 are fixed in the inner wall of the clamping groove 18 and the outside of the motor 1 respectively, the two sides of the support one 5 are close to each other through the tension spring 20, and the sealing cover 12 is located inside the pressure relief port 13.

[0058] Working principle: when static, spring 10 pulls the moving frame 9, and the tension spring 20 pulls the two side supports 5 to approach each other and contact the connecting seat 4, at this time, the moving frame 9 drives the magnetic ring 11 and the sealing cover 12 to move down to the inner wall of the bottom shell 2, at this time, the sealing cover 12 is in the pressure relief port 13, and there is a gap between the sealing cover 12 and the pressure relief port 13; then the driving motor 1 drives the connecting seat 4 to rotate, and drives the support 5, the support 6, the weight block 7 and the magnet 8 to rotate through the connecting seat 4; the centrifugal force generated by the rotation of the connecting seat 4 makes the support 5, the support 6, the weight block 7 and the magnet 8 rotate along the connecting seat 4 as the rotation axis, and also rotate along the connecting point of the support 6 and the connecting seat 4 as the rotation axis, at this time, the tension spring 20 is in the stretched state, and the weight block 7 and the magnet 8 are away from the connecting seat 4 and close to the magnetic ring 11; after the magnet 8 approaches the magnetic ring 11, the principle of opposite sex attraction is used to pull the magnetic ring 11 without contact; after the magnetic ring 11 is pulled, the moving frame 9 and the sealing cover 12 move up and stretch the spring 10, at this time, the outer wall of the sealing cover 12 contacts the bottom surface of the inner wall of the bottom shell 2, thereby blocking the pressure relief port 13; at this time, the pump body 3 forms a closed system through sealing, then the gas in the suction port 17 enters the cavity inside the bottom shell 2, and finally is discharged from the pump body 3, thereby realizing the vacuumizing function; after the motor 1 is stopped, the magnet 8 loses the centrifugal force, the spring 10 restores and pulls the magnetic ring 11 to move down, and the tension spring 20 pulls the two side magnets 8 to approach the connecting seat 4 at the same time, after the magnet 8 and the magnetic ring 11 move away from each other, then the sealing cover 12 enters the pressure relief port 13 without contacting the pressure relief port 13, and the atmospheric gas outside enters the bottom shell 2 from the pressure relief port 12.

[0059] Finally, it should be pointed out that: the above only describes the preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A contactless vacuum pump drive based on the transmission of centrifugal and magnetic forces, characterized in that, It includes: Motor (1), bottom shell (2) and pump body (3), the motor (1) output end through the connecting seat (4) and the shaft of pump body (3) are connected, for transmitting motor (1) power to make pump body (3) run, the air in bottom shell (2) is extracted through pump body (3); Frame (9) is located in bottom shell (2), and is connected with spring (10), the spring (10) is between motor (1) and bottom shell (2), for moving frame (9) by elastic potential energy to make frame (9) reset; Magnetic ring (11) is connected with frame (9), the connecting seat (4) outside is connected with magnetic force assembly, when the motor (1) is not driven, the spring (10) makes frame (9) be in initial position, when the motor (1) is driven, the magnetic force assembly is opened by centrifugal force and is close to magnetic ring (11), frame (9) is displaced by magnetic force to drive magnetic ring (11), at this time, the sealing cover (12) connected with frame (9) blocks the pressure relief port (13) of bottom shell (2).

2. A contactless vacuum pump drive based on centrifugal and magnetic force transmission according to claim 1, characterized in that: The magnetic force assembly includes support one (5) and support two (6), one side of support two (6) is rotatably connected with the outer wall of connecting seat (4), support one (5) is fixedly connected with support two (6), and the inside of support one (5) is provided with weight block (7), and the inside of support two (6) is provided with magnet (8).

3. A contactless vacuum pump drive based on centrifugal and magnetic force transmission according to claim 2, characterized in that: The cross section of the combination of support one (5) and support two (6) is L-shaped, and the bottom shell (2) and the motor (1) are connected by screws (16).

4. The contactless vacuum pump drive based on centrifugal and magnetic force transmission according to claim 1, characterized in that: The bottom shell (2) is provided with a cavity inside, and is provided with an air outlet (17) outside, and the pressure relief port (13), the cavity and the air outlet (17) are communicated.

5. The contactless vacuum pump drive based on centrifugal and magnetic force transmission according to claim 1, characterized in that: The inner wall of the bottom shell (2) is fixed with a guide rod (14), and the middle part of the frame (9) is provided with a guide hole (15), and the guide rod (14) is slidably connected in the guide hole (15).

6. The contactless vacuum pump drive based on centrifugal and magnetic force transmission according to claim 1, characterized in that: The bottom shell (2) is provided with an opening (19) near the motor (1) side, and the connecting seat (4) and the spring (10) are located in the opening (19).

7. The contactless vacuum pump drive based on centrifugal and magnetic force transmission according to claim 2, characterized in that: The magnetic poles of the magnet (8) and the magnetic ring (11) near the side are the same, the frame (9) is provided with a clamping groove (18) near the spring (10) side, one side of the spring (10) is located in the clamping groove (18), and the other side is in contact with the motor (1), and the sealing cover (12) is located outside the pressure relief port (13).

8. A contactless vacuum pump drive based on centrifugal and magnetic force transmission according to claim 7, characterized in that: The magnetic poles of the magnet (8) and the magnetic ring (11) near the side are different, the two sides of the spring (10) are fixed on the inner wall of the clamping groove (18) and the outside of the motor (1) respectively, and the two sides of the support one (5) are close to each other through the tension spring (20), and the sealing cover (12) is located inside the pressure relief port (13).

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