Vacuum pumps and vacuum extraction devices

Abstract

An embodiment of the present invention provides a vacuum pump and a vacuum pumping device. The vacuum pump includes a collecting and exhaust chamber with an air inlet nozzle and an exhaust nozzle correspondingly provided on the outer wall, a leather cup assembly assembled in the collecting and exhaust chamber, and a drive motor. An adapter is fixed to the end of the output shaft, an eccentric shaft is provided on the adapter, and the leather cup assembly is assembled on the eccentric shaft. An air inlet is also provided on the side wall of the collecting and exhaust chamber. The vacuum pump also includes a sealing mechanism provided inside the collecting and exhaust chamber. The sealing mechanism includes: a cover plate for correspondingly sealing the air inlet; a one-way transmission assembly connected to the adapter in a one-way transmission manner, the one-way transmission assembly only drives the cover plate to move from the air inlet to the open position when the output shaft of the drive motor rotates along a predetermined first direction, thereby connecting the inner cavity of the collecting and exhaust chamber to the outside world; a reset assembly connected to the cover plate, for causing the cover plate to return from the open position to a sealed position covering the air inlet. This embodiment can effectively reduce the volume, production cost and working noise.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of vacuum pumping devices, and in particular to a vacuum pump and a vacuum pumping device. Background Art

[0002] An existing vacuum pumping device is usually composed of a vacuum pump, a solenoid valve and a controller. The suction nozzle of the vacuum pump is connected to the corresponding vacuum container through the corresponding suction pipeline. The solenoid valve is usually a three-way valve and is connected to the suction pipeline. The first and second ports of the solenoid valve are respectively connected to the suction nozzle and the vacuum container, and the third port is connected to the outside world. When vacuuming is required, the controller first controls the solenoid valve to connect the first port to the second port and close the third port, and then controls the drive motor of the vacuum pump to drive the collecting and exhaust components to suck out the air in the vacuum container to achieve vacuuming. When vacuuming is required, the controller controls the solenoid valve to connect the second port to the third port to allow external air to enter the vacuum container. Of course, some existing vacuum pumping devices also connect the solenoid valve to the suction pipeline through a three-way pipe joint, so that there is no need to use a three-way valve structure.

[0003] However, the applicant found in a specific embodiment that the existing vacuum pump must be used in conjunction with a solenoid valve to achieve the vacuum exhaust operation of the vacuum container, and the solenoid valve will produce exhaust vibration during operation, which is likely to generate loud noise; moreover, the solenoid valve occupies a relatively large volume and costs a relatively large amount, which is not conducive to the miniaturization of the vacuum pumping device and the reduction of production costs. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a vacuum pump that can achieve vacuum exhaust operation without relying on a solenoid valve.

[0005] A further technical problem to be solved by the embodiments of the present invention is to provide a vacuum pumping device that can achieve vacuum exhaust operation without using a solenoid valve, and can effectively reduce the volume, production cost and working noise.

[0006] In order to solve the above technical problems, an embodiment of the present invention first provides the following technical solutions: a vacuum pump, comprising a collecting and exhaust chamber with an air inlet nozzle and an exhaust nozzle correspondingly provided on the outer wall, a leather cup assembly assembled in the collecting and exhaust chamber, and a drive motor with an output shaft correspondingly extending into the collecting and exhaust chamber, an adapter seat being fixed to the end of the output shaft, an eccentric shaft oblique to the output shaft being provided on the adapter seat, one end of the leather cup assembly being assembled on the eccentric shaft, an air inlet hole communicating with the inside and outside of the collecting and exhaust chamber being further provided on the side wall of the collecting and exhaust chamber, the vacuum pump further comprising a sealing mechanism provided inside the collecting and exhaust chamber for movably sealing the air inlet hole, the sealing mechanism comprising:

[0007] A cover plate for correspondingly sealing the air inlet hole;

[0008] a one-way transmission assembly having one end connected to the cover plate and the other end in one-way transmission connection with the adapter, wherein the one-way transmission assembly drives the cover plate to move from the air inlet to an open position to connect the inner cavity of the air collecting and exhausting chamber to the outside only when the output shaft of the drive motor rotates along a predetermined first direction; and

[0009] A reset assembly is connected to the cover plate and is used to cause the cover plate to return from the open position to a sealed position covering the air inlet.

[0010] Furthermore, the cover plate is pivotally connected to the inner wall of the exhaust chamber by means of a first pivot, and the one-way transmission component and the reset component respectively cause the cover plate to rotate in opposite directions around the first pivot.

[0011] Furthermore, the reset component is a torsion spring, which is sleeved on the first pivot and has one torsion arm pressed against the cover plate while the other torsion arm is fixed relative to the inner wall of the exhaust chamber.

[0012] The cam is secured to the side of the second support frame and is adapted to engage the second support member when the cam is engaged with the first and second support members.

[0013] Furthermore, the cover plate and the driven rod are connected to form a V shape, a pivot hole is provided at the connection portion between the cover plate and the driven rod, and the first pivot is passed through the pivot hole.

[0014] Furthermore, the stop block protrudes outward from the side wall of the adapter seat, and the end of the stop block is further bent and extended along the circumference of the adapter seat to form a pivot seat arranged relative to the outer side wall of the adapter seat at a predetermined distance. The movable rocker arm is accommodated in the space between the outer side wall of the adapter seat and the pivot seat, and the second pivot shaft is passed through the movable rocker arm and the opposite ends are pivoted on the side wall of the adapter seat and the pivot seat respectively.

[0015] Furthermore, the end of the stop block is further bent and extended along the circumference of the adapter seat to form the pivot seat, and the second pivot is perpendicular to the output shaft of the drive motor; or at least one side edge of the opposite side edges of the stop block in the axial direction of the adapter seat is further bent and extended along the circumference of the adapter seat to form the pivot seat, and the second pivot is parallel to the output shaft of the drive motor.

[0016] Furthermore, a side of the movable rocker arm close to the stop block is provided with a avoiding chamfer.

[0017] Furthermore, a sealing gasket is fixed on a side surface of the cover plate facing the air inlet and correspondingly seals and covers the air inlet.

[0018] On the other hand, in order to solve the above-mentioned further technical problems, an embodiment of the present invention further provides the following technical solution: a vacuum pumping device, comprising a vacuum pump and a controller connected to the drive motor of the vacuum pump for controlling the drive motor to output bidirectional rotational power, wherein the vacuum pump is a vacuum pump as described in any one of the above items.

[0019] After adopting the above technical scheme, the embodiment of the present invention has at least the following beneficial effects: the embodiment of the present invention provides a sealing mechanism for the air inlet hole and the movable sealing air inlet hole connected to the inside and outside of the collecting and exhaust chamber in the collecting and exhaust chamber. Since one end of the one-way transmission component of the sealing mechanism is connected to the cover plate and the other end is connected to the adapter seat for one-way transmission, when the vacuum pump needs to perform a vacuum exhaust operation, the driving motor adopts a predetermined first direction rotation to drive the adapter seat to rotate, so that the one-way transmission component drives the cover plate to move from the air inlet hole to the open position so that the inner cavity of the collecting and exhaust chamber is connected to the outside world, thereby continuing the vacuum operation; when the vacuum pump needs to perform a vacuum operation, the driving motor rotates in a direction opposite to the first direction. At this time, the one-way transmission component cannot drive the cover plate to move, and the reset component prompts the cover plate to return from the open position to the sealing position covering the air inlet hole, thereby continuing the vacuum operation; vacuuming and vacuum exhaust can be achieved without relying on a solenoid valve, which reduces production costs and reduces working noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the disassembled structure of an optional embodiment of the vacuum pump of the present invention.

[0021] Figure 2 This is a schematic diagram of the assembly structure of an optional embodiment of the vacuum pump of the present invention.

[0022] Figure 3 This is a schematic structural diagram of a capping mechanism of an optional embodiment of the vacuum pump of the present invention.

[0023] Figure 4 This is a schematic cross-sectional structural diagram of an optional embodiment of the vacuum pump of the present invention, with the cover plate in a sealing position.

[0024] Figure 5 This is a schematic cross-sectional structural diagram of an optional embodiment of the vacuum pump of the present invention, with the cover in the open position.

[0025] Figure 6 This is a schematic structural diagram of the eccentric shaft and movable rod of an optional embodiment of the vacuum pump of the present invention.

[0026] Figure 7 This is a schematic structural diagram of another optional embodiment of the vacuum pump of the present invention in which the eccentric shaft and the movable rod are separated.

[0027] Figure 8 This is a schematic cross-sectional view of an optional embodiment of the vacuum pump of the present invention.

[0028] Figure 9 This is a schematic diagram of the disassembled structure of another optional embodiment of the vacuum pump of the present invention.

[0029] Figure 10 This is a module schematic diagram of an optional embodiment of the vacuum pumping device of the present invention. DETAILED DESCRIPTION

[0030] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following exemplary embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. Moreover, the embodiments and features in the embodiments of the present application may be combined with each other unless there is a conflict.

[0031] like Figure 1-Figure 5 As shown, an optional embodiment of the present invention provides a vacuum pump A, including a collecting and exhaust chamber 1 with an air inlet nozzle 10 and an exhaust nozzle 12 correspondingly provided on the outer wall, a leather cup assembly 3 assembled in the collecting and exhaust chamber 1, and a drive motor 5 with an output shaft 50 correspondingly extending into the collecting and exhaust chamber 1, an adapter 6 is fixed to the end of the output shaft 50, an eccentric shaft 7 oblique to the output shaft 50 is provided on the adapter 6, one end of the leather cup assembly 3 is assembled on the eccentric shaft 7, and an air inlet hole 14 connecting the inside and outside of the collecting and exhaust chamber 1 is further provided on the side wall of the collecting and exhaust chamber 1, the vacuum pump also includes a sealing mechanism 8 provided inside the collecting and exhaust chamber 1 for movably sealing the air inlet hole, and the sealing mechanism 8 includes:

[0032] A cover plate 80 for correspondingly sealing the air inlet hole;

[0033] a one-way transmission assembly 82 having one end connected to the cover plate 80 and the other end in one-way transmission connection with the adapter 6, wherein the one-way transmission assembly 82 drives the cover plate 80 to move from the air inlet 14 to the open position to connect the inner cavity of the collecting and exhaust chamber 1 with the outside only when the output shaft 50 of the drive motor 5 rotates along a predetermined first direction; and

[0034] The reset assembly 84 is connected to the cover plate 80 and is used to cause the cover plate 80 to return from the open position to a sealed position covering the air inlet 14 .

[0035] The embodiment of the present invention provides a covering mechanism 8 in the exhaust chamber 1 that connects the air inlet 14 inside and outside the exhaust chamber 1 and the movable sealing air inlet 14. Since one end of the one-way transmission component 82 of the covering mechanism 8 is connected to the cover plate 80 and the other end is connected to the adapter seat 6 for one-way transmission, when the vacuum pump A needs to perform a vacuum exhaust operation, the drive motor 5 adopts a predetermined first direction rotation to drive the adapter seat 6 to rotate, so that the one-way transmission component 82 drives the cover plate 80 to move from the air inlet 14 to the open position, so that the inner cavity of the exhaust chamber 1 is connected to the outside world, thereby continuing the vacuum operation; when the vacuum pump A needs to perform a vacuum operation, the drive motor 5 rotates in a direction opposite to the first direction. At this time, the one-way transmission component 82 cannot drive the cover plate 80 to move, and the reset component 84 prompts the cover plate 80 to return from the open position to the sealing position covering the air inlet 14, thereby continuing the vacuum operation; vacuuming and vacuum exhaust can be achieved without relying on a solenoid valve, which reduces production costs and reduces working noise.

[0036] In an optional embodiment of the present invention, Figure 1 As shown, the cover plate 80 is pivotally connected to the inner wall of the exhaust chamber 1 via a first pivot 801. The one-way transmission assembly 82 and the reset assembly 84 respectively cause the cover plate 80 to rotate in opposite directions about the first pivot 801. In this embodiment, the cover plate 80 is pivotally connected to the inner wall of the exhaust chamber 1 via the first pivot 801, and movement between the sealed position and the open position is achieved by rotating in opposite directions, resulting in a simple structure.

[0037] In an optional embodiment of the present invention, Figure 1 and Figure 3 As shown, the reset assembly 84 is a torsion spring, which is sleeved on the first pivot 801 and has one torsion arm 841 pressing against the cover plate, while the other torsion arm 841 is fixed relatively to the inner wall of the exhaust chamber 1. In this embodiment, the reset assembly 84 uses a torsion spring, and the torsion elastic force generated by the torsion arm 841 of the torsion spring applies elastic force to the cover plate 80, and the two torsion arms 841 of the torsion spring 84 press against the back of the cover plate 80 and the inner wall of the exhaust chamber 1 respectively, so the assembly is relatively convenient. Figure 1-Figure 5 In the embodiment, a limit cover 86 is further fixedly assembled on the top end of the first pivot 801 to prevent the torsion spring from falling off from the first pivot 801 .

[0038] In an optional embodiment of the present invention, Figure 1 、 Figure 3-Figure 5 As shown, the one-way transmission assembly 82 includes a movable rocker 821 pivotally connected to the outer wall of the adapter seat 6 by means of a second pivot 82a, a stopper 823 provided on the side wall of the adapter seat 6 and located on one side of the movable rocker 821 so that the movable rocker 821 can only rotate in one direction, and a driven rod 825 with one end fixedly connected to the cover plate 80, the end of the movable rocker 821 away from the second pivot 82a forms an abutment portion 821a, and the end of the driven rod 825 away from the cover plate 80 extends to the movable rocker 821 in a direction perpendicular to the output shaft 50 and rotates along the adapter seat 6 around the When the output shaft 50 rotates along the first direction within the rotation path of the abutment portion 821a, when the drive motor 5 drives the output shaft 50 to rotate along the first direction, the movable rocker arm 821 is stopped by the block 823 and the abutment portion 821a pushes the driven rod 825 to make the cover 80 rotate around the first pivot 801. When the drive motor 5 drives the output shaft 5 to rotate in a direction opposite to the first direction, the movable rocker arm 821 is subjected to the reaction force of the driven rod 825 when the abutment portion 821a abuts against the driven rod 825 and rotates around the second pivot 82a. In this embodiment, the one-way transmission assembly 82 is composed of a movable rocker arm 821, a stop block 823 and a driven rod 825, and has a simple structure. The stop block 823 is used to limit the movable rocker arm 821 on one side of the movable rocker arm 821, so that when the output shaft 5 rotates along the first direction, the driven rod 825 can be linked with the movable rocker arm 821 to make the cover plate 80 rotate around the first pivot 801, and the structure is simple.

[0039] In specific implementation, the one-way transmission assembly 82 can also be implemented using a common one-way transmission structure such as a ratchet mechanism; Figure 1-Figure 5 In the embodiment, the movable rocker arm 821 adopts an L-shaped design to facilitate the abutment installation with the driven rod 825; finally, the drive motor 5 drives the output shaft 50 to rotate along the first direction, which is usually the motor reverse; and the drive motor 5 drives the output shaft 5 to rotate in the direction opposite to the first direction, which is the motor forward rotation.

[0040] In an optional embodiment of the present invention, Figure 1 and Figure 3As shown, the cover plate 80 and the driven rod 825 are connected in a V-shape. A pivot hole 803 is defined at the connection between the cover plate 80 and the driven rod 825, and the first pivot 801 is disposed within the pivot hole 803. In this embodiment, the cover plate 80 and the driven rod 825 are connected in a V-shape, which facilitates installation of the cover plate 80 and provision of the air inlet 14. Furthermore, the provision of the pivot hole 803 facilitates installation with the first pivot 801.

[0041] In an optional embodiment of the present invention, Figure 6 and Figure 7 As shown, the stopper 823 protrudes outward from the side wall of the adapter seat 6, and the distal end of the stopper 823 is further bent and extends along the circumference of the adapter seat 6 to form a pivot seat 823a disposed opposite the outer wall of the adapter seat 6 at a predetermined distance. The movable rocker 821 is accommodated in the space between the outer wall of the adapter seat 6 and the pivot seat 823a. The second pivot 82a is provided through the movable rocker 821, and its opposite ends are pivotally attached to the side wall of the adapter seat 6 and the pivot seat 823a, respectively. In this embodiment, the pivot seat 823a is formed at the distal end of the stopper 823 to facilitate the installation of the second pivot 82a, thereby simplifying the assembly structure.

[0042] In an optional embodiment of the present invention, the end of the stopper 823 is further bent and extended along the circumference of the adapter 6 to form the pivot seat 823a, and the second pivot 82a is perpendicular to the output shaft 50 of the drive motor 5 (such as Figure 6 or at least one of the two side edges of the stopper 823 on the axial direction of the adapter 6 is further bent and extends along the circumference of the adapter 6 to form the pivot seat 823a, and the second pivot 82a is parallel to the output shaft 50 of the drive motor 5 (as shown); Figure 7 In this embodiment, whether the second pivot 82a is perpendicular or parallel to the output shaft 50 of the driving motor 5, the movable swing arm 821 can be effectively realized, and the movable swing arm 821 and the cover plate 80 can realize one-way transmission.

[0043] In an optional embodiment of the present invention, Figure 6 and Figure 7As shown, the abutment portion of the movable rocker arm 821 is further provided with a side avoidance chamfer 821b near the stopper 823. When the drive motor 5 drives the leather cup assembly 3 to move to realize the vacuum operation, the output shaft 50 of the drive motor 5 rotates at high speed in the opposite direction to the first steering direction, and the movable rocker arm 821 rotates synchronously with the adapter seat 6 (similar to revolution), and due to the inertia of movement, it rotates around the second pivot 82a to a certain angle (similar to rotation) and hovers at this angular position. By providing the avoidance chamfer 821b in this embodiment, the movable rocker arm 821 can avoid colliding with the driven rod 825 when it rotates with the adapter seat 6 to the position of the driven rod 825, thereby reducing the noise during the vacuum operation.

[0044] In an optional embodiment of the present invention, Figure 3 and Figure 8 As shown, a sealing gasket 805 is fixed to the side surface of the cover plate 80 facing the air inlet 14, which seals and covers the air inlet 14. In this embodiment, the provision of the sealing gasket 805 effectively enhances the sealing effect of the cover plate 80 on the air inlet 14, ensuring the airtightness of the vacuum pump during vacuum operation.

[0045] In addition, if Figure 8 and Figure 9 As shown, the exhaust chamber 1 includes a cylinder body 15 with a plurality of cylinder chambers 150 that are connected vertically and isolated from each other, a bottom shell 16 and a valve plate 17 that are respectively sealed to the bottom and top ends of the cylinder body 15, and a top cover 18 that is sealed to the top end of the valve plate 17. The air inlet nozzle 10 and the air inlet hole 14 are both provided on the bottom shell 16, the sealing mechanism 8 is assembled in the bottom shell 16, the output shaft 50 of the drive motor 5 extends from the bottom surface of the bottom shell 16 into the interior of the bottom shell 16, the exhaust nozzle 12 is provided on the top cover 18, and the valve plate 17 is provided on the top cover 18. An airflow hole 171 and an umbrella 173 for movably covering the outlet end of the airflow hole 171 are provided. The leather cup assembly 3 includes a swing frame 30 having multiple piston rods 301 and multiple integral leather cups 32. The multiple piston rods 301 and the multiple leather cups 32 extend into the cylinder chamber 150 from the bottom and top ends of each cylinder chamber 150, respectively, and are mutually connected within the cylinder chamber 150. The bottom end of the swing frame 30 is fixed to the eccentric shaft 7, and multiple portions located outside the cylinder chamber 150 are clamped and fixed by the valve plate 17 and the cylinder body 15. In this embodiment, the leather cup 32 is assembled within the cylinder body 15, and the output shaft 50 of the drive motor 5 drives the eccentric shaft 7 and the swing frame 30, thereby driving the compression movement of the leather cup 32, thereby efficiently drawing air from the intake nozzle 10 and exhausting it from the exhaust nozzle 12.

[0046] On the other hand, Figure 10As shown, another embodiment of the present invention provides a vacuum pump device comprising a vacuum pump A and a controller B connected to a drive motor 5 of the vacuum pump A for controlling the drive motor 5 to output bidirectional rotational power. The vacuum pump is the vacuum pump described in the above embodiment. In this embodiment, the vacuum pump device employs the aforementioned vacuum pump A, which effectively reduces its size, production costs, and operating noise. In specific implementations, the controller B can control the drive motor 5 to output bidirectional rotational power by switching the positive and negative voltages of the drive motor 5.

[0047] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A vacuum pump, comprising a collecting and exhaust chamber with an air inlet nozzle and an exhaust nozzle correspondingly provided on the outer wall, a leather cup assembly assembled in the collecting and exhaust chamber, and a drive motor whose output shaft extends into the collecting and exhaust chamber, wherein a transfer seat is fixed to the end of the output shaft, an eccentric shaft oblique to the output shaft is provided on the transfer seat, one end of the leather cup assembly is assembled on the eccentric shaft, and is characterized in that: An air inlet hole communicating with the inside and outside of the air collecting and exhausting chamber is further provided on the side wall of the air collecting and exhausting chamber. The vacuum pump further includes a sealing mechanism provided inside the air collecting and exhausting chamber for movably sealing the air inlet hole. The sealing mechanism includes: A cover plate for correspondingly sealing the air inlet hole; a one-way transmission assembly having one end connected to the cover plate and the other end in one-way transmission connection with the adapter, wherein the one-way transmission assembly drives the cover plate to move from the air inlet to an open position to connect the inner cavity of the air collecting and exhausting chamber to the outside only when the output shaft of the drive motor rotates along a predetermined first direction; and a reset assembly connected to the cover plate, and configured to cause the cover plate to return from the open position to a sealed position covering the air inlet; The cover plate is pivotally connected to the inner wall of the exhaust chamber by means of a first pivot, and the one-way transmission assembly and the reset assembly respectively cause the cover plate to rotate in opposite directions around the first pivot; A sealing gasket is fixed on a side surface of the cover plate facing the air inlet and correspondingly seals and covers the air inlet.

2. The vacuum pump according to claim 1, wherein The reset component is a torsion spring, which is sleeved on the first pivot and has one torsion arm pressed against the cover plate while the other torsion arm is fixed relatively to the inner wall of the exhaust chamber.

3. The vacuum pump according to claim 1 or 2, wherein: The one-way transmission assembly includes an active rocking arm pivotally connected to the outer wall of the transfer seat by means of a second pivot, a stopper provided on the side wall of the transfer seat and located on one side of the active rocking arm so that the active rocking arm can only rotate in one direction, and a driven arm fixedly connected to the cover plate at one end, wherein the active rocking arm forms an abutment at one end away from the second pivot, and the end of the driven arm away from the cover plate extends in a direction perpendicular to the output shaft to within the range of a rotation path of the abutment when the active rocking arm rotates along the central axis of the output shaft with the transfer seat when the drive motor drives the output shaft to rotate along the first direction. When the drive motor drives the output shaft to rotate along the first direction 4. The vacuum pump according to claim 3, wherein The cover plate and the driven rod are connected to form a V shape. A pivot hole is provided at a connection portion between the cover plate and the driven rod. The first pivot shaft is passed through the pivot hole.

5. The vacuum pump according to claim 3, wherein The stopper protrudes outward from the side wall of the adapter seat, and the end of the stopper is further bent and extended along the circumference of the adapter seat to form a pivot seat arranged relative to the outer side wall of the adapter seat at a predetermined distance. The movable rocker arm is accommodated in the space between the outer side wall of the adapter seat and the pivot seat, and the second pivot shaft is passed through the movable rocker arm and the opposite ends are pivoted on the side wall of the adapter seat and the pivot seat respectively.

6. The vacuum pump according to claim 5, wherein The end of the stop block is further bent and extended along the circumference of the adapter seat to form the pivot seat, and the second pivot is perpendicular to the output shaft of the drive motor; or at least one side edge of the opposite side edges of the stop block in the axial direction of the adapter seat is further bent and extended along the circumference of the adapter seat to form the pivot seat, and the second pivot is parallel to the output shaft of the drive motor.

7. The vacuum pump according to claim 5, wherein A side of the abutment portion of the movable rocker arm close to the stop block is further provided with a avoiding chamfer.

8. A vacuum pumping device comprising a vacuum pump and a controller connected to a drive motor of the vacuum pump for controlling the drive motor to output bidirectional rotational power, characterized in that: The vacuum pump is the vacuum pump according to any one of claims 1 to 7.

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