Miniature vacuum pump and miniature vacuumizing device

Abstract

A miniature vacuum pump and a miniature vacuumizing device. The miniature vacuum pump comprises a collection and exhaust chamber (1), a cup assembly (3), a drive motor (5), and a vacuum breaking assembly (7), wherein the collection and exhaust chamber (1) is provided with an air inlet nozzle (10) and an exhaust hole (12). The vacuum breaking assembly (7) comprises: an air inlet hole (70) penetrating through the bottom wall of the collection and exhaust chamber (1); a pressing plate (72) movably fitted over the section of an output shaft (50) located in the collection and exhaust chamber (1), and correspondingly movably covering the air inlet hole (70); and a rotating base (74) coaxially and fixedly arranged on the output shaft (50) and located on the side of the pressing plate (72) away from the bottom wall, wherein the center of gravity of a centrifugal swing rod (76) is arranged at the end away from the rotating base (74), and the end of the centrifugal swing rod (76) close to the rotating base (74) is bent and extends towards the pressing plate (72) to form an abutting portion (761) for abutting against the pressing plate (72). The vacuum pump implements vacuum pumping operation by means of a centrifugal force.

Description

Micro vacuum pump and micro vacuum device Technical Field

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

[0002] Existing small household electrical appliances such as small vacuum packaging machines and electric breast pumps all require vacuum devices. Due to different requirements on performance indicators such as power, vacuum degree, service life, noise, volume, and safety, large vacuum pumps and vacuum devices widely used in industry or commerce are not applicable, and micro vacuum devices are needed.

[0003] An existing micro vacuum device is usually composed of a micro vacuum pump, a solenoid valve and a controller. The suction nozzle of the vacuum pump is connected to the corresponding vacuum container through a corresponding suction pipeline. The solenoid valve is usually a three-way valve and is connected to the suction pipeline, wherein the first port and the second port 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 driving motor of the vacuum pump to drive the collecting and exhausting components to suck away the air in the vacuum container to realize the vacuuming operation; and 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.

[0004] However, the inventors found in a specific embodiment that the existing micro vacuum device uses a solenoid valve to achieve the vacuum operation of the vacuum container, and the solenoid valve is prone to exhaust vibration during operation, which produces a lot of 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 micro vacuum device and the reduction of production costs. Technical issues

[0005] The technical problem to be solved by the embodiments of the present application is to provide a miniature vacuum pump that can achieve vacuum exhaust operation without relying on a solenoid valve.

[0006] A further technical problem to be solved by the embodiments of the present application is to provide a miniature vacuum pumping device that can achieve vacuum exhaust operations without using a solenoid valve, and can effectively reduce the volume, production costs and working noise. Solution

[0007] In order to solve the above technical problems, the embodiment of the present application first provides the following technical solutions: a micro vacuum pump, comprising a collecting and exhaust chamber provided with an air inlet nozzle and an exhaust hole, a leather cup assembly assembled in the inner cavity of the collecting and exhaust chamber, and a drive motor with an output shaft passing through the bottom wall of the collecting and exhaust chamber and extending into the inner cavity and being in transmission connection with the leather cup assembly to drive the leather cup assembly to work; the micro vacuum pump also includes a vacuum breaking assembly, which includes:

[0008] an air inlet formed through the bottom wall of the exhaust collecting chamber;

[0009] A pressure plate movably sleeved on the section of the output shaft located in the collecting and exhausting chamber and correspondingly movably covering the air inlet hole;

[0010] a rotating seat coaxially fixedly assembled on the output shaft and located on a side of the pressure plate away from the bottom wall, wherein a pivoting frame is protruding from an outer side surface of the rotating seat;

[0011] The middle section is pivotally mounted on a pivot frame on the outer side of the rotating seat by means of a centrifugal pendulum arm, wherein the pivot is perpendicular to the output shaft, the center of gravity of the centrifugal pendulum arm is set at an end away from the rotating seat, and the end of the centrifugal pendulum arm close to the rotating seat is bent and extended toward the pressure plate to form a pressing portion for pressing the pressure plate; and

[0012] A reset elastic member has one end fixed relative to the exhaust chamber and the other end abutting against a side surface of the pressure plate facing the bottom wall, and is used to push the pressure plate away from the bottom wall so that the air inlet hole is connected to the inner cavity of the exhaust chamber.

[0013] Furthermore, the vacuum breaking assembly also includes: a reset elastic member, one end of which is fixed relatively to the exhaust chamber and the other end abuts against the side surface of the pressure plate facing the bottom wall, which is used to push the pressure plate away from the bottom wall so that the air inlet hole is connected to the inner cavity of the exhaust chamber.

[0014] Furthermore, a plurality of pivot frames are provided on the outer side surface of the rotating seat in a rotationally symmetrical manner around the central axis of the rotating seat, and a centrifugal rocker is pivotally provided on each pivot frame.

[0015] Furthermore, a gap is formed between the pressure plate and the bottom surface of the rotating seat in the axial direction of the output shaft, and the end of the pressing portion is inserted into the gap and abuts against the bottom surface of the rotating seat when the output shaft is not rotating.

[0016] Furthermore, a sealing gasket is provided on a side surface of the pressure plate facing the bottom wall at a position facing the air inlet hole.

[0017] Furthermore, the outer wall surface of the bottom wall is also recessed to form a noise reduction groove with one end connected to the outer end opening of the air inlet hole and the other end having a notch on the outer side surface of the exhaust chamber, and the noise reduction groove is filled with sound insulation cotton.

[0018] Furthermore, the pressure plate is provided with a guide hole axially parallel to the output shaft, and a guide rod parallel to the output shaft and correspondingly inserted into the guide hole is provided on the bottom wall.

[0019] Furthermore, a through hole is opened in the middle of the pressure plate, a support bushing is fixedly assembled in the through hole, and the output shaft passes through the sleeve hole in the middle of the support bushing and is movably arranged relative to the sleeve hole in the axial direction.

[0020] Furthermore, a stepped hole is provided in the middle of the bottom wall, and the end of the stepped hole connected to the inner cavity of the exhaust chamber is a small-diameter end, and the end away from the exhaust chamber is a large-diameter end. The output shaft passes through the stepped hole and extends into the inner cavity of the exhaust chamber. A sealing gasket is also assembled in the large-diameter end. One side surface of the sealing gasket abuts against the connecting step surface between the small-diameter end and the large-diameter end, and an abutment ring is provided on the other side surface surrounding the inner hole of the sealing gasket for abutting against the end face of the drive motor.

[0021] Furthermore, the reset elastic member is a helical compression spring correspondingly sleeved on the output shaft, and the middle part of the plate surface on one side of the pressure plate facing the bottom wall correspondingly bulges outward to form a convex ring correspondingly arranged around the through hole, and one end of the helical compression spring is sleeved on the convex ring and the other end passes through the stepped hole and the inner hole of the sealing gasket and is sleeved on the shaft seat correspondingly arranged on the end face of the drive motor for the output shaft to pass through.

[0022] Furthermore, the outer side surface of the bottom wall is provided with positioning holes on opposite sides of the thick-diameter end, and positioning bosses protrude from opposite sides of the sealing gasket, and the positioning bosses are correspondingly inserted into the positioning holes to position the sealing gasket.

[0023] On the other hand, in order to solve the above-mentioned further technical problems, the embodiments of the present application further provide the following technical solutions: a micro vacuum device, comprising a micro vacuum pump and a controller connected to the drive motor of the micro vacuum pump for controlling the working state of the drive motor, wherein the micro vacuum pump is a vacuum pump as described above.

[0024] After adopting the above technical solution, the embodiment of the present application has at least the following beneficial effects: the micro vacuum pump in the embodiment of the present application adds a vacuum breaking component, specifically, an air inlet is set on the bottom wall of the collecting and exhaust chamber, and the air inlet is movably covered by a pressure plate. When the micro vacuum pump needs to perform a vacuum operation and starts the driving motor, since the center of gravity of the centrifugal pendulum arm is set at one end away from the rotating seat, the output shaft of the driving motor rotates and drives the rotating seat to rotate, causing the centrifugal pendulum arm to deflect around the pivot under the action of centrifugal force. At this time, the pressing part of the centrifugal pendulum arm close to one end of the rotating seat immediately pushes the pressure plate, so that the pressure plate overcomes the elastic force of the reset elastic member and covers the housing. The air inlet hole is used to isolate the inner cavity of the collecting and exhaust chamber from the outside atmosphere, thereby realizing normal vacuuming operation; and when the micro vacuum pump needs to perform vacuuming operation and shuts down the driving motor, the output shaft and the rotating seat of the driving motor stop rotating, the centrifugal force disappears and the pressing part of the centrifugal rocker arm no longer applies pressing pressure to the pressure plate. Due to the pressure difference between the inner cavity of the collecting and exhaust chamber and the outside atmosphere, the pressure plate is pushed open by the outside atmosphere, and the air inlet hole is opened to connect the inner cavity of the collecting and exhaust chamber with the outside atmosphere, and the outside atmosphere enters the inner cavity of the collecting and exhaust chamber from the air inlet hole to realize vacuuming operation. Vacuuming and vacuuming can be realized without relying on the solenoid valve, which reduces production costs and reduces working noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic diagram of the disassembled structure of an optional embodiment of the micro vacuum pump of the present application.

[0026] FIG2 is a schematic diagram of the assembly structure of an optional embodiment of the micro vacuum pump of the present application.

[0027] FIG3 is a schematic diagram of the disassembled structure of a vacuum breaking component of an optional embodiment of the micro vacuum pump of the present application.

[0028] FIG4 is a schematic diagram of the assembly structure of a vacuum breaking component of an optional embodiment of the micro vacuum pump of the present application, excluding the reset elastic member.

[0029] FIG5 is a schematic cross-sectional view of a pressure plate covering an air inlet hole in an optional embodiment of the micro vacuum pump of the present application.

[0030] FIG6 is a schematic cross-sectional view of the structure of an optional embodiment of the micro vacuum pump of the present application, in which the pressure plate opens the air inlet.

[0031] FIG7 is a schematic diagram of the disassembled structure of an optional embodiment of the micro vacuum pump of the present application after being inverted.

[0032] FIG8 is a schematic diagram of a module of an optional embodiment of the micro vacuum device of the present application. Embodiments of the present invention

[0033] 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 application and are not intended to limit the present application. Moreover, the embodiments and features in the embodiments of the present application may be combined with each other unless there is a conflict.

[0034] As shown in Figures 1 to 6, an optional embodiment of the present application provides a micro vacuum pump A, including a collection and exhaust chamber 1 provided with an air inlet nozzle 10 and an exhaust hole 12, a leather cup assembly 3 assembled in the inner cavity 1a of the collection and exhaust chamber 1, and a drive motor 5 with an output shaft 50 passing through the bottom wall of the collection and exhaust chamber 1 and extending into the inner cavity 1a and being in transmission connection with the leather cup assembly 3 to drive the leather cup assembly 3 to work. The micro vacuum pump also includes a vacuum breaking assembly 7, which includes:

[0035] An air inlet hole 70 formed through the bottom wall 1b of the exhaust chamber 1;

[0036] A pressure plate 72 movably sleeved on the section of the output shaft 50 located in the exhaust collecting chamber 1 and correspondingly movably covering the air inlet hole 70;

[0037] a rotating base 74 coaxially fixedly assembled on the output shaft 50 and located on the side of the pressure plate 72 away from the bottom wall 1 b , wherein a pivot bracket 741 is protruding from the outer side surface of the rotating base 74 ; and

[0038] The middle section is pivoted on a centrifugal rocker arm 76 on a pivot frame on the outer side of the rotating seat 74 by means of a pivot 76a. The pivot 76a is perpendicular to the output shaft 50. The center of gravity of the centrifugal rocker arm 76 is set at one end away from the rotating seat 74. The end of the centrifugal rocker arm 76 close to the rotating seat 74 is bent and extended toward the pressure plate 72 to form a pressing portion 761 for pressing the pressure plate 72.

[0039] The micro vacuum pump A of the embodiment of the present application is provided with a vacuum breaking component 7. Specifically, an air inlet 70 is provided on the bottom wall of the collecting and exhaust chamber 1, and a pressure plate 72 is used to movably cover the air inlet 70. When the micro vacuum pump A needs to perform a vacuum operation and starts the driving motor 5, since the center of gravity of the centrifugal pendulum 76 is set at one end away from the rotating seat 74, the output shaft 50 of the driving motor rotates to drive the rotating seat 74 to rotate, causing the centrifugal pendulum 76 to deflect around the pivot 76a under the action of centrifugal force. At this time, the pressing portion 761 of the centrifugal pendulum 76 close to one end of the rotating seat 74 immediately pushes the pressure plate 72, so that the pressure plate 72 overcomes the elastic force of the reset elastic member 78 and covers the centrifugal pendulum 76. The air inlet 70 is blocked, thereby isolating the inner cavity 1a of the collecting and exhaust chamber 1 from the outside atmosphere, thereby realizing normal vacuuming operation; and when the micro vacuum pump A needs to perform vacuuming operation and shuts down the drive motor 5, the output shaft 50 of the drive motor 5 and the rotating seat 74 stop rotating, the centrifugal force disappears and the pressing part 761 of the centrifugal rocker 76 no longer applies pressing force to the pressure plate 72. Due to the pressure difference between the inner cavity 1a of the collecting and exhaust chamber 1 and the outside atmosphere, the pressure plate 72 is pushed away by the outside atmosphere, and the outside atmosphere enters the inner cavity 1a of the collecting and exhaust chamber 1 from the air inlet 70, realizing vacuuming operation. Vacuuming and vacuuming can be achieved without relying on the solenoid valve, which reduces production costs and reduces working noise.

[0040] In the specific implementation, it can be understood that when the output shaft 50 of the driving motor 5 rotates at a predetermined angular velocity to drive the centrifugal pendulum 76 to swing and push the pressure plate 72 to cover the air inlet 70, the centrifugal pendulum 76 is in a force balance state. Therefore, whether the micro vacuum pump is in a tilted or inverted state, the output shaft 50 rotates at the predetermined angular velocity to drive the centrifugal pendulum 76 to swing, which will also cause the centrifugal pendulum 76 to swing to the corresponding position and balance. At this time, the centrifugal pendulum 7 also pushes the pressure plate 72 to cover the air inlet 70.

[0041] In another optional embodiment of the present application, as shown in FIG1 , FIG3 , FIG5 - FIG7 , the vacuum breaking assembly 7 further includes:

[0042] The reset elastic member 78 has one end fixed relative to the exhaust chamber 1 and the other end abutting against a side surface of the pressure plate 72 facing the bottom wall 1b, and is used to push the pressure plate 72 away from the bottom wall 1b so that the air inlet 70 is connected to the inner cavity 1a of the exhaust chamber 1. In this embodiment, the output shaft 50 of the drive motor 5 and the rotating seat 74 stop rotating, the centrifugal force disappears, and the pressing portion 761 of the centrifugal rocker 76 no longer applies a pressing force to the pressure plate 72. The pressure plate 72 returns to its initial position with the assistance of the elastic force of the reset elastic member 78, and the air inlet 70 opens to connect the inner cavity 1a of the exhaust chamber 1 with the outside atmosphere. The outside atmosphere enters the inner cavity 1a of the exhaust chamber 1 through the air inlet 70, thereby achieving a vacuum exhaust operation.

[0043] In another optional embodiment of the present application, as shown in Figures 1-6, a plurality of pivoting frames 741 are rotationally symmetrically disposed on the outer side of the rotating base 74 about the central axis of the rotating base 74, and a centrifugal rocker 76 is pivotally mounted on each pivoting frame 741. In this embodiment, by symmetrically disposing the centrifugal rockers 76 on opposite side walls of the rotating base 74, when the rotating base 74 rotates under the drive of the output shaft 50, the centrifugal rockers 76 on both sides thereof can always symmetrically apply a resisting force to the pressure plate 72, thereby stably maintaining the pressure plate 72 in a position covering the air inlet 70 and ensuring the sealing performance of the pressure plate 72 with respect to the air inlet 70.

[0044] In a specific implementation, two opposite sides of the rotating seat 74 are symmetrically provided with one pivot frame 741 , and each pivot frame 741 is pivotally provided with one centrifugal rocker 76 .

[0045] In another optional embodiment of the present application, as shown in FIG4 , a gap is defined between the pressure plate 72 and the bottom surface of the rotating seat 74 in the axial direction of the output shaft 50. The distal end of the pressing portion 721 is inserted into the gap and abuts against the bottom surface of the rotating seat 74 when the output shaft 50 is not rotating. In this embodiment, when the output shaft 50 is not rotating, the distal end of the pressing portion 761 abuts against the bottom surface of the rotating seat 74 to prevent the top weight of the centrifugal pendulum 76 from pressing against the pressure plate 72 and covering the air inlet 70. A counterweight 763 is assembled at the end of the centrifugal pendulum 76 away from the rotating seat 74. By adding the counterweight 763, the center of gravity of the centrifugal pendulum 76 can be effectively adjusted so that the center of gravity is located at the end away from the rotating seat 74.

[0046] In another optional embodiment of the present application, as shown in Figures 1-6 , a sealing gasket 721 is provided on one side of the pressure plate 72 facing the bottom wall 1b, directly opposite the air inlet 70. In this embodiment, the provision of the sealing gasket 721 effectively enhances the sealing effect of the pressure plate 72 on the air inlet 70, ensuring the airtightness of the micro-vacuum pump during vacuum operation. Specifically, the bottom surface of the pressure plate 721 is provided with a recess, and the sealing gasket 721 is embedded in the recess.

[0047] In another optional embodiment of the present application, as shown in Figures 4 to 7, the outer wall surface of the bottom wall 1b is further recessed to form a noise reduction groove 14 having one end connected to the outer end opening of the air inlet 70 and the other end having a notch formed on the outer side surface of the air collecting and exhaust chamber 1. The noise reduction groove 14 is filled with sound insulation cotton 16. In this embodiment, by providing the noise reduction groove 14 and assembling the sound insulation cotton 16 in the noise reduction groove 14, when the micro vacuum pump performs the vacuum exhaust operation, the outside atmosphere rapidly enters the air collecting and exhaust chamber 1 through the noise reduction groove 14 and the air inlet 70. On the one hand, the sound insulation cotton 16 can effectively reduce the airflow noise during air intake, and on the other hand, it can effectively prevent external foreign matter from entering the air collecting and exhaust chamber 1 along with the outside atmosphere.

[0048] In another optional embodiment of the present application, as shown in Figures 1-6, the pressure plate 72 is further provided with a guide hole 723 axially parallel to the output shaft 50. A corresponding guide rod 17 is protruded from the bottom wall 1b and is parallel to the output shaft 50 and correspondingly extends through the guide hole 723. In this embodiment, the pressure plate 72 is slidably mounted on the guide rod 17 via the guide hole 723. The guide hole 723 slides up and down on the guide rod 17, effectively guiding the up and down movement of the pressure plate 72. In a specific embodiment, the bottom end of the guide rod 17 is inserted and fixed into a predetermined positioning hole in the bottom wall 1b.

[0049] In another optional embodiment of the present application, as shown in Figures 1-6, a through hole 725 is defined in the center of the pressure plate 72. A support bushing 727 is fixedly assembled within the through hole 725. The output shaft 50 passes through a sleeve hole in the center of the support bushing 727 and is axially movable relative to the sleeve hole. In this embodiment, a support bushing 727 is further disposed in the through hole 725 in the center of the pressure plate 72. The support bushing 727 ensures the normal rotation of the output shaft 50 in the center of the pressure plate 72, preventing interference between the output shaft 50 and the pressure plate 72, and effectively supports the pressure plate 72. In a specific implementation, the support bushing 727 may be a ball bearing or a support washer.

[0050] In another optional embodiment of the present application, as shown in Figures 1 to 7, a stepped hole 18 is provided in the middle of the bottom wall 1b, and the end of the stepped hole 18 connected to the inner cavity 1a of the collecting and exhaust chamber 1 is a small diameter end, and the end away from the collecting and exhaust chamber 1 is a large diameter end. The output shaft 50 passes through the stepped hole and extends into the inner cavity 1a of the collecting and exhaust chamber 1. A sealing gasket 19 is also assembled in the large diameter end. One side surface of the sealing gasket 19 abuts against the connecting step surface between the small diameter end and the large diameter end, and the other side surface is protruded from the inner hole surrounding the sealing gasket 19 and is provided with an abutment ring 191 for abutting against the end face of the drive motor 5. In this embodiment, a stepped hole 18 is provided on the bottom wall 1b, and a sealing gasket 19 is installed using the stepped hole 18. When the output shaft 50 extends into the inner cavity 1a of the exhaust chamber 1 through the stepped hole 18, the sealing of the exhaust chamber 1 is ensured. Moreover, the sealing gasket 19 has an abutment ring 191, which effectively enhances the sealing performance between the sealing gasket 19 and the drive motor 5.

[0051] In another optional embodiment of the present application, as shown in Figures 1-7, the reset elastic member 78 is a helical compression spring correspondingly mounted on the output shaft 50. A convex ring 729 is formed on the central portion of the side surface of the pressure plate 72 facing the bottom wall 1b, surrounding the through hole 725. One end of the helical compression spring 78 is mounted on the convex ring 729, while the other end passes through the stepped hole 18 and the inner hole of the sealing gasket 19 and is mounted on the shaft seat 52 provided on the end surface of the drive motor 5 for the output shaft 50. In this embodiment, the reset elastic member 78 is a helical compression spring mounted on the output shaft 50. This structure is simple, and the two ends of the helical compression spring 78 respectively abut the pressure plate 72 and the shaft seat 52 of the drive motor 5, facilitating the helical compression spring 78 to apply an elastic thrust to the pressure plate 72. Furthermore, the provision of the convex ring 729 effectively positions the end of the helical compression spring 78.

[0052] In another optional embodiment of the present application, as shown in Figures 1 and 7, the outer side surface of the bottom wall 1b is further provided with positioning holes 181 on opposite sides of the large-diameter end, and positioning protrusions 193 protrude from opposite sides of the sealing gasket 19. The positioning protrusions 193 are correspondingly inserted into the positioning holes 181 to position the sealing gasket 19. In this embodiment, the positioning protrusions 193 are correspondingly inserted into the positioning holes 181 to position the sealing gasket 19. In this embodiment, the sealing gasket 19 is positioned within the large-diameter end of the stepped hole 18 by being inserted into the positioning holes 181, thereby preventing the sealing gasket 19 from easily falling out during assembly.

[0053] On the other hand, as shown in Figure 8, another embodiment of the present application provides a micro-vacuum device, comprising a micro-vacuum pump A and a controller B connected to a drive motor 5 of the vacuum pump A for controlling the operating state of the drive motor 5. The micro-vacuum pump is the micro-vacuum pump of the aforementioned embodiment. In this embodiment, the micro-vacuum device employs the aforementioned micro-vacuum pump A, which effectively reduces its size, production costs, and operating noise.

[0054] In addition, the exhaust chamber includes a cylinder body with a plurality of cylinder chambers that are connected up and down and isolated from each other, a bottom shell and a valve plate that are respectively sealed and connected to the bottom and top of the cylinder body, and a top cover that is sealed and connected to the top of the valve plate. The air inlet nozzle and the air inlet hole are both arranged on the bottom shell, and the sealing mechanism is assembled in the bottom shell. The output shaft of the drive motor extends into the interior of the bottom shell from the bottom surface of the bottom shell, the exhaust nozzle is arranged on the top cover, and the valve plate is provided with air flow holes and an umbrella for movably covering the air outlet end of the air flow hole. The leather cup assembly includes a swing frame with multiple piston columns and multiple leather cups connected as one. The multiple piston columns and the multiple leather cups respectively extend into the cylinder chamber from the bottom and top of each cylinder chamber and are connected to each other in the cylinder chamber. The bottom end of the swing frame is provided with an eccentric shaft, the bottom end of the eccentric shaft is fixed on the rotating seat 74, and the central axis of the eccentric shaft and the output shaft 50 are obliquely intersected; multiple parts located outside the cylinder chamber are clamped and fixed by the valve plate and the cylinder body.

[0055] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application 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 this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, which all fall within the scope of protection of this application.

Claims

1. A micro vacuum pump, comprising an air collection and exhaust chamber provided with an air inlet nozzle and an exhaust hole, a leather cup assembly assembled in the inner cavity of the air collection and exhaust chamber, and a drive motor whose output shaft passes through the bottom wall of the air collection and exhaust chamber and extends into the inner cavity to be in transmission connection with the leather cup assembly to drive the leather cup assembly to work. Characterized in that, The micro vacuum pump further comprises a vacuum breaking assembly, and the vacuum breaking assembly includes: An air inlet hole penetrating through the bottom wall of the air collection and exhaust chamber; A pressing plate movably sleeved on the section of the output shaft located in the air collection and exhaust chamber and correspondingly and movably covering the air inlet hole; A rotating seat coaxially and fixedly assembled on the output shaft and located on the side of the pressing plate away from the bottom wall, and a pivot frame is convexly arranged on the outer side surface of the rotating seat; and A centrifugal swing rod whose middle section is pivotally arranged on the pivot frame on the outer side surface of the rotating seat by means of a pivot shaft, the pivot shaft is perpendicular to the output shaft, the center of gravity of the centrifugal swing rod is arranged at one end far from the rotating seat, and one end of the centrifugal swing rod close to the rotating seat bends and extends towards the pressing plate direction to form a pressing portion for pressing the pressing plate.

2. The micro vacuum pump according to claim 1, Characterized in that, The vacuum breaking assembly further includes: a reset elastic member, one end of which is relatively fixed to the air collection and exhaust chamber and the other end abuts against the side plate surface of the pressing plate facing the bottom wall, and is used to push the pressing plate away from the bottom wall to connect the air inlet hole with the inner cavity of the air collection and exhaust chamber.

3. The micro vacuum pump according to claim 1 or 2, Characterized in that, A plurality of the pivot frames are symmetrically arranged on the outer side surface of the rotating seat around the central axis of the rotating seat, and one centrifugal swing rod is pivotally arranged on each pivot frame.

4. The micro vacuum pump according to claim 1 or 2, Characterized in that, There is a gap between the pressing plate and the bottom surface of the rotating seat in the axial direction of the output shaft, and the end of the pressing portion is inserted into the gap and abuts against the bottom surface of the rotating seat when the output shaft does not rotate.

5. The micro vacuum pump according to claim 3, Characterized in that, There is a gap between the pressing plate and the bottom surface of the rotating seat in the axial direction of the output shaft, and the end of the pressing portion is inserted into the gap and abuts against the bottom surface of the rotating seat when the output shaft does not rotate.

6. The micro vacuum pump according to claim 1 or 2, Characterized in that, A sealing gasket is arranged at the position on the side plate surface of the pressing plate facing the bottom wall and directly opposite to the air inlet hole.

7. The micro vacuum pump according to claim 1 or 2, Characterized in that, A noise reduction groove is correspondingly recessed on the outer wall surface of the bottom wall, one end of the noise reduction groove is communicated with the outer end hole of the air inlet hole, and the other end has a notch opened on the outer side surface of the air collection and exhaust chamber, and sound insulation cotton is filled in the noise reduction groove.

8. The micro vacuum pump according to claim 1 or 2, Characterized in that, A guide hole with an axial direction parallel to the output shaft is further opened on the pressing plate, and a guide rod parallel to the output shaft and correspondingly penetrating through the guide hole is convexly arranged on the bottom wall.

9. The micro vacuum pump according to claim 1, Characterized in that, A through hole is formed in the middle of the pressing plate, and a support bushing is fixedly assembled in the through hole. The output shaft passes through the hole in the middle of the support bushing and is arranged to be axially relatively movable with respect to the hole.

10. The micro vacuum pump according to claim 2, characterized in that A through hole is formed in the middle of the pressing plate, and a support bushing is fixedly assembled in the through hole. The output shaft passes through the hole in the middle of the support bushing and is arranged to be axially relatively movable with respect to the hole.

11. The micro vacuum pump according to claim 10, characterized in that A stepped hole is formed in the middle of the bottom wall. One end of the stepped hole connecting the inner cavity of the gas collecting and exhausting chamber is a small-diameter end, and the end far from the gas collecting and exhausting chamber is a large-diameter end. The output shaft passes through the stepped hole and extends into the inner cavity of the gas collecting and exhausting chamber. A sealing washer is also assembled in the large-diameter end. One side of the sealing washer abuts against the connecting step surface of the small-diameter end and the large-diameter end, and on the opposite side, a butting ring is protrudingly arranged around the inner hole of the sealing washer for correspondingly butting against the end face of the driving motor.

12. The micro vacuum pump according to claim 11, characterized in that The reset elastic member is a helical compression spring correspondingly sleeved on the output shaft. The middle of the side plate surface of the pressing plate facing the bottom wall is correspondingly convex to form a convex ring surrounding the through hole. One end of the helical compression spring is sleeved on the convex ring, and the other end passes through the stepped hole and the inner hole of the sealing washer and is sleeved on the shaft seat correspondingly arranged on the end face of the driving motor for the output shaft to pass through.

13. The micro vacuum pump according to claim 1, characterized in that A stepped hole is formed in the middle of the bottom wall. One end of the stepped hole connecting the inner cavity of the gas collecting and exhausting chamber is a small-diameter end, and the end far from the gas collecting and exhausting chamber is a large-diameter end. The output shaft passes through the stepped hole and extends into the inner cavity of the gas collecting and exhausting chamber. A sealing washer is also assembled in the large-diameter end. One side of the sealing washer abuts against the connecting step surface of the small-diameter end and the large-diameter end, and on the opposite side, a butting ring is protrudingly arranged around the inner hole of the sealing washer for correspondingly butting against the end face of the driving motor.

14. The micro vacuum pump according to claim 11 or 13, characterized in that On the outer side surface of the bottom wall, positioning jacks are respectively arranged on the opposite two sides of the large-diameter end. Positioning convex columns respectively protrude from the opposite two sides of the sealing washer, and the positioning convex columns are correspondingly inserted into the positioning jacks to position the sealing washer.

15. A micro vacuuming device, comprising a micro vacuum pump and a controller connected to the driving motor of the micro vacuum pump for controlling the working state of the driving motor, characterized in that The micro vacuum pump is the micro vacuum pump according to any one of claims 1-14.

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