Miniature vacuum pump and miniature vacuumizing device

Abstract

The embodiment of the utility model provides a miniature vacuum pump and a miniature vacuumizing device, the miniature vacuum pump comprises an air collecting and exhausting chamber, a driving motor and a vacuum breaking assembly assembled in the air collecting and exhausting chamber, and the vacuum breaking assembly comprises an air inlet hole penetrating through the bottom wall of the air collecting and exhausting chamber; the pressing plate is movably sleeved on the section of the output shaft positioned in the collecting and exhausting chamber; a pivoting frame is arranged on the outer side surface of the rotating seat in a protruding manner; the gravity center of the centrifugal swing rod is arranged at the end away from the rotating base, and the end, close to the rotating base, of the centrifugal swing rod forms an abutting part. A penetrating hole is formed in the middle of the pressing plate, the output shaft penetrates through the penetrating hole, a positioning groove is formed in the side, facing the pressing plate, of the abutting portion, a ball is assembled in the positioning groove, and a part of the ball protrudes out of a groove opening of the positioning groove and abuts against the pressing plate. The embodiment of the utility model can simplify the assembly and reduce the cost.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of vacuum pumping devices, and in particular to a micro vacuum pump and a micro vacuum pumping device. 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, safety, etc., large vacuum pumps and vacuum devices that are widely used in industry or commerce are not applicable, and micro vacuum devices are required. An existing micro vacuum device is usually composed of a micro vacuum pump and a controller, wherein an existing micro vacuum pump includes a collecting and exhaust chamber with an air inlet nozzle and an exhaust hole, a leather cup assembly assembled in the inner cavity of the collecting and exhaust chamber, 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 connected to the leather cup assembly to drive the leather cup assembly to work, and a vacuum breaking assembly assembled in the collecting and exhaust chamber. The vacuum breaking assembly can correspondingly draw vacuum and exhaust vacuum when the drive motor is started and stopped.

[0003] The cam is an air intake port and a pressure plate is movably mounted on the output shaft of the pump and is located on the side of the cam which is away from the bottom wall of the pressure plate.

[0004] However, the inventors found in a specific embodiment that in order to ensure that the output shaft and the inner ring of the ball bearing can be relatively movable in the axial direction, the output shaft and the ball bearing are very troublesome to assemble, and the cost of the ball bearing is relatively high, which increases the assembly difficulty and production cost of the micro vacuum device. Utility Model Content

[0005] The technical problem to be solved by the embodiments of the utility model is to provide a miniature vacuum pump which can reduce the difficulty of assembly and the production cost.

[0006] A further technical problem to be solved by the embodiments of the present utility model is to provide a miniature vacuum pumping device that can reduce assembly difficulty and production cost.

[0007] In order to solve the above technical problems, the embodiment of the utility model first provides the following technical solutions: a micro vacuum pump, comprising a collecting and exhausting chamber provided with an air inlet nozzle and an exhaust hole, a driving motor with an output shaft passing through the bottom wall of the collecting and exhausting chamber and extending into the collecting and exhausting chamber, and a vacuum breaking component assembled in the collecting and exhausting chamber, wherein the vacuum breaking component comprises:

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

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

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

[0011] The middle section is a centrifugal swing arm pivoted on the pivot frame by means of a pivot, the pivot is perpendicular to the output shaft, the center of gravity of the centrifugal swing arm is set at an end away from the output shaft, and the end of the centrifugal swing arm close to the output shaft is formed with a pressing portion for pressing and positioning the pressing plate at a covering position corresponding to the sealing covering of the air inlet when the centrifugal swing arm rotates with the output shaft; and

[0012] A resetting elastic member, used for pushing the pressing plate to a through position where the air inlet hole is connected to the inner cavity of the collecting and exhausting chamber;

[0013] A through hole is opened in the middle of the pressure plate, and the output shaft passes through the through hole. A positioning groove is provided on the side of the pressing portion facing the pressure plate, and a ball is assembled in the positioning groove. A part of the ball protrudes from the notch of the positioning groove and presses against the pressure plate.

[0014] Furthermore, a limiting plate is assembled on the outer side of the groove of the positioning groove to limit the ball in the positioning groove, and a window is opened on the limiting plate for a part of the ball to protrude outward, and the window is a circle with a diameter smaller than the diameter of the ball or a regular polygon with an inscribed circle diameter smaller than the diameter of the ball.

[0015] Furthermore, the width of the notch is slightly smaller than the diameter of the ball, and the ball is squeezed from the notch into the positioning groove.

[0016] Furthermore, the centrifugal rocker arm includes a connecting portion located in the middle and having a pivot hole at one end for the pivot to pass through, a counterweight end formed by bending from the end of the connecting portion with the pivot hole and extending toward a side away from the output shaft, and the pressing portion formed by bending and extending from the end of the connecting portion away from the pivot hole.

[0017] Furthermore, a plurality of pivot frames are symmetrically arranged on the outer side surface of the rotating seat around the central axis of the rotating seat, a centrifugal swing rod is pivotally arranged on each pivot frame, and the pressing parts of each centrifugal swing rod are rotationally symmetrically distributed around the output shaft.

[0018] Furthermore, a gap is provided 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. When the output shaft is not rotating, the pressing portion abuts against the bottom surface of the rotating seat under the push of the reset elastic member.

[0019] Furthermore, the counterweight end is provided with a receiving groove, in which a counterweight block made of a high specific gravity material is embedded. The bottom wall of the receiving groove is also provided with an operating opening which is connected to the inner cavity of the receiving groove and for inserting a corresponding tool to push the counterweight block out of the notch of the receiving groove.

[0020] Furthermore, a sealing gasket is provided at a position of the side plate surface of the pressure plate facing the bottom wall opposite to the air inlet hole; a guide hole axially parallel to the output shaft is also opened on the pressure plate, and a guide rod parallel to the output shaft and correspondingly penetrated into the guide hole is protruded on the bottom wall.

[0021] Furthermore, an annular air inlet groove is provided on the outer side surface of the bottom wall of the exhaust chamber, which is connected to the outer end opening of the air inlet hole and is arranged around the output shaft. Sound insulation cotton is installed at the position of the annular air inlet groove that is connected to the outer end opening of the air inlet hole. When the drive motor is assembled at the bottom of the exhaust chamber, a predetermined air intake gap is provided between the end face of the drive motor and the outer side surface of the bottom wall, and at least a portion of the sound insulation cotton is exposed from the side of the drive motor.

[0022] On the other hand, in order to solve the above-mentioned further technical problems, the embodiment of the utility model further provides the following technical solutions: a miniature vacuum pump, comprising a miniature vacuum pump and a controller connected to the driving motor of the miniature vacuum pump for controlling the working state of the driving motor, wherein the miniature vacuum pump is a vacuum pump as described above.

[0023] After adopting the above technical scheme, the embodiment of the utility model has at least the following beneficial effects: the pressure plate of the vacuum breaking component of the embodiment of the utility model is provided with a through hole, and during the specific assembly, the output shaft of the driving motor is directly passed through the through hole, and a positioning groove is provided on the pressing surface of the pressing part of the centrifugal pendulum arm, and a ball is assembled in the positioning groove. The ball can rotate universally around its own spherical center in the positioning groove, and the pressing part of the centrifugal pendulum arm is pressed against the pressure plate through the ball. The centrifugal pendulum arm revolves around the output shaft under the drive of the output shaft of the driving motor and rotates around the pivot at the same time. During the whole activity process, the pressing part of the centrifugal pendulum arm is pressed against the pressure plate by the ball and rolls relatively on the plate surface of the pressure plate, with little wear, thereby ensuring that both the centrifugal pendulum arm and the pressure plate can move smoothly, and the assembly structure is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of the disassembled structure of an optional embodiment of the micro vacuum pump of the utility model.

[0025] Figure 2 The figure is a schematic diagram of the assembly structure of an optional embodiment of the micro vacuum pump of the utility model.

[0026] Figure 3 The utility model is a schematic diagram of the disassembled structure of a vacuum breaking component of an optional embodiment of the micro vacuum pump.

[0027] Figure 4 This is a schematic diagram of the assembly structure of a vacuum breaking component of an optional embodiment of the micro vacuum pump of the utility model, excluding the resetting elastic member.

[0028] Figure 5 The figure is a schematic cross-sectional structure diagram of an optional embodiment of the micro vacuum pump of the utility model along the plane where the centers of two balls are located.

[0029] Figure 6 The cross-sectional structure diagram of the disassembly and assembly state of the ball and the pressing part of an optional embodiment of the micro vacuum pump of the utility model is shown.

[0030] Figure 7 The cross-sectional structure diagram of the ball and the pressing part of an optional embodiment of the micro vacuum pump of the utility model is shown.

[0031] Figure 8 This is a schematic diagram of the disassembled structure of an optional embodiment of the micro vacuum pump of the utility model after the centrifugal swing arm is inverted.

[0032] Fig. 9 This is a schematic cross-sectional structure diagram of an optional embodiment of the micro vacuum pump of the utility model when the pressure plate opens the air inlet hole.

[0033] Fig.10This is a schematic cross-sectional structure diagram of an optional embodiment of the micro vacuum pump of the utility model when the pressure plate covers the air inlet hole.

[0034] Fig.11 This is a schematic structural diagram of the disassembly and assembly of the external sound insulation cotton of the driving motor in an optional embodiment of the micro vacuum pump of the utility model.

[0035] Fig.12 This is a module schematic diagram of an optional embodiment of the micro vacuum device of the utility model. DETAILED DESCRIPTION

[0036] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. In addition, the embodiments and features in the embodiments of the present application may be combined with each other without conflict.

[0037] like Figure 1-Figure 10 As shown, an optional embodiment of the utility model 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 driving motor 3 with an output shaft 30 passing through the bottom wall of the collection and exhaust chamber 1 and extending into the collection and exhaust chamber 1, and a vacuum breaking component 5 assembled in the collection and exhaust chamber 1, the vacuum breaking component 5 includes:

[0038] An air inlet hole 50 formed through the bottom wall 1a of the exhaust chamber 1;

[0039] A pressing plate 52 movably sleeved on the section of the output shaft 30 located in the exhaust chamber 1 and used for movably covering the air inlet hole 50;

[0040] a rotating seat 54 coaxially fixedly assembled on the output shaft 30 and located on a side of the pressing plate 52 away from the bottom wall 1 a , wherein a pivot frame 541 is protrudingly provided on an outer side surface of the rotating seat 54 ; and

[0041] The middle section is a centrifugal swing arm 56 pivoted on the pivot frame 541 by means of a pivot 56a, the pivot 56a is perpendicular to the output shaft 30, the center of gravity of the centrifugal swing arm 56 is set at an end away from the output shaft 30, and the end of the centrifugal swing arm 56 close to the output shaft 30 is formed with a pressing portion 561 for pressing and positioning the pressing plate 52 at a covering position corresponding to the sealing covering of the air inlet 50 when the centrifugal swing arm 56 rotates with the output shaft 30; and

[0042] A resetting elastic member 58 is used to push the pressing plate 52 to a through position where the air inlet hole 50 is connected to the inner cavity of the collecting and exhausting chamber 1;

[0043] A through hole 521 is provided in the middle of the pressure plate 52, and the output shaft 30 passes through the through hole 521. A positioning groove 563 is provided on the side of the pressing portion 561 facing the pressure plate 52, and a ball 565 is assembled in the positioning groove 563. A part of the ball 565 protrudes from the notch 563a of the positioning groove 563 and presses against the pressure plate 52.

[0044] The pressure plate 52 of the vacuum breaking component 5 of the utility model embodiment is provided with a through hole 521. During the specific assembly, the output shaft 30 of the driving motor 3 is directly passed through the through hole 521. In addition, a positioning groove 563 is provided on the pressing surface of the pressing portion 561 of the centrifugal pendulum 56, and a ball 565 is assembled in the positioning groove 563. The ball 565 can rotate universally around its own spherical center in the positioning groove 563. The pressing portion 561 of the centrifugal pendulum 56 is pressed on the pressure plate 52 through the ball 565. When the centrifugal pendulum 56 is driven by the output shaft 30 of the driving motor 3, it also rotates around the pivot 56a. During the whole activity process, the pressing portion 561 of the centrifugal pendulum 56 is pressed against the pressure plate 52 with the ball 565 and rolls relatively on the plate surface of the pressure plate 52, with little wear and tear, thereby ensuring that both the centrifugal pendulum 56 and the pressure plate 52 can move smoothly. Moreover, the assembly structure is simple and the cost is low.

[0045] In a specific implementation, the reset elastic member 58 can be a helical compression spring sleeved on the output shaft 30. When assembled, the reset elastic member 58 abuts against the side plate surface of the pressure plate 52 facing the bottom wall 1a of the exhaust chamber 1 with one end, and abuts against the inner surface of the bottom wall 1a of the exhaust chamber 1 with the other end, or Figure 8 and Fig. 9 As shown in the figure, the through hole on the bottom wall 1a through which the output shaft passes is abutted against the corresponding end face of the driving motor 3. The positioning groove 563 can be a spherical groove, a cylindrical groove or a polygonal groove with a regular polygonal cross section. The inner wall of the positioning groove 563 effectively abuts against the positioning ball 565 and can effectively prevent the ball 565 from moving in the positioning groove 563, but will not prevent the ball 565 from rotating around its own spherical center.

[0046] In an optional embodiment of the present invention, Figure 5-Figure 6 As shown, a limiting plate 566 is assembled outside the notch 563a of the positioning groove 563 to limit the ball 565 in the positioning groove 563, and a window 566a is opened on the limiting plate 566 for a part of the ball 565 to protrude outward, and the window 566a is a circle with a diameter smaller than the diameter of the ball 565 or a regular polygon with an inscribed circle diameter smaller than the diameter of the ball 565. In this embodiment, the ball 565 and the limiting plate 566 are installed in sequence during assembly with the help of the limiting plate 566, which is convenient for installation.

[0047] In an optional embodiment of the present invention, Figure 7 and Figure 8 As shown, the width of the notch 563a is slightly smaller than the diameter of the ball 565, and the ball 565 is squeezed from the notch 563a and inserted into the positioning groove 563. In this embodiment, since the width of the notch 563a is slightly smaller than the diameter of the ball 565, during specific assembly, a relatively large pressure is directly used to press the ball 565 from the notch 563a into the positioning groove 563, and the overall structure is simpler.

[0048] In an optional embodiment of the present invention, Figure 3 As shown, the centrifugal swing rod 56 includes a connecting portion 567 located in the middle and having a pivot hole 567a for the pivot 56a to pass through at one end, a counterweight end 568 formed by bending and extending from one end of the connecting portion 567 having the pivot hole 567a toward a side away from the output shaft 30, and a pressing portion 561 formed by bending and extending from one end of the connecting portion 567 away from the pivot hole 567a. In this embodiment, the centrifugal swing rod 56 includes the connecting portion 567, the counterweight end 568 and the pressing portion 561, and the structure is relatively simple. By adjusting the weight of the counterweight end 568, the center of gravity position of the entire centrifugal swing rod 56 can be adjusted very conveniently.

[0049] In an optional embodiment of the present invention, Figure 1-Figure 4 , Figure 9-10 As shown, the outer side surface of the rotating seat 54 is provided with a plurality of pivoting frames 541 in rotational symmetry around the central axis of the rotating seat 54, and a centrifugal swing rod 56 is pivotally provided on each pivoting frame 541, and the pressing portions 561 of each centrifugal swing rod 56 are distributed in rotational symmetry around the output shaft 30. In this embodiment, by respectively and rotationally symmetricly providing the centrifugal swing rods 56 on the two side walls of the rotating seat 54, when the rotating seat 54 rotates under the drive of the output shaft 30, each centrifugal swing rod 56 always symmetrically applies a thrust force to the pressing plate 52, so that the pressing plate 52 is stably maintained at a position covering the air inlet 50, thereby ensuring the sealing performance of the pressing plate 52 to the air inlet 50.

[0050] In an optional embodiment of the present invention, Figure 4As shown, there is a gap 52a between the pressure plate 52 and the bottom surface of the rotating seat 54 in the axial direction of the output shaft 30, and the end of the pressing portion 561 is inserted into the gap 52a. When the output shaft 30 is not rotating, the pressing portion 561 abuts against the bottom surface of the rotating seat 54 under the push of the reset elastic member 58. In this embodiment, when the drive motor 3 is not started, the output shaft 30 will not drive the centrifugal pendulum 56 to revolve. The centrifugal pendulum 56 will rotate around the pivot 56a under the action of its own gravity to the end away from the output shaft 30 and fall down, so that the pressing portion 561 moves toward the bottom surface of the rotating seat 54 accordingly, and finally the end of the pressing portion 561 is pressed against the bottom surface of the rotating seat 54 to be positioned, thereby preventing the centrifugal pendulum 56 from rotating around the pivot 56a too much, thereby preventing the centrifugal pendulum 56 from being able to quickly rotate around the pivot 56a to the position of sealing the air inlet 50 when the drive motor 3 is started, which can effectively shorten the working response time of the micro vacuum pump.

[0051] In an optional embodiment of the present invention, Figure 3 and Figure 7 As shown, the counterweight end 568 is provided with a receiving groove 5680, in which a counterweight block 5682 made of a material with a large specific gravity is embedded, and an operation opening 5684 is provided on the bottom wall of the receiving groove 5680, which is connected to the inner cavity of the receiving groove 5680 and is provided for a corresponding tool to be inserted to push the counterweight block 5682 out of the notch of the receiving groove 5680. In this embodiment, by adding a counterweight block 5682, the center of gravity position of the centrifugal pendulum 56 can be effectively adjusted by using the counterweight block 5682, so that the center of gravity is set at one end away from the rotating seat 54; and by providing the receiving groove 5680, the assembly of the counterweight block 5682 is very simple; and by providing the operation opening 5684, it is convenient to take the counterweight block 5682 out of the receiving groove 5680.

[0052] In an optional embodiment of the present invention, Figure 3 , Figure 9-10 As shown, a sealing gasket 523 is provided at a position where the side plate surface of the pressing plate 52 facing the bottom wall 1a is directly opposite to the air inlet 50. In this embodiment, by providing the sealing gasket 523, the sealing and sealing effect of the pressing plate 52 on the air inlet 50 is effectively enhanced, thereby ensuring the air tightness of the micro vacuum pump during vacuum operation. In a specific implementation, a pit is provided on the bottom surface of the pressing plate 52, and the sealing gasket 523 is embedded in the pit.

[0053] In an optional embodiment of the present invention, Figure 3 , Figure 9-10As shown, the pressing plate 52 is also provided with a guide hole 525 axially parallel to the output shaft 30, and the bottom wall 1a is provided with a guide rod 14 parallel to the output shaft 30 and correspondingly penetrated into the guide hole 525. In this embodiment, the pressing plate 52 is slidably sleeved on the guide rod 14 through the guide hole 525, and the guide hole 525 is sleeved on the guide rod 14 to slide up and down, which can effectively guide the up and down lifting movement of the pressing plate 52. In a specific implementation, the bottom end of the guide rod 14 is inserted and fixed in the positioning hole preset in the bottom wall 1a.

[0054] In an optional embodiment of the present invention, Fig.11 As shown, the outer side surface of the bottom wall 1a of the exhaust chamber 1 is provided with an annular air inlet groove 101 which is connected with the outer end opening of the air inlet hole 50 and is arranged around the output shaft 30. The annular air inlet groove 101 is installed with sound insulation cotton 103 at the position connected with the outer end opening of the air inlet hole 50. When the drive motor 3 is assembled at the bottom of the exhaust chamber 1, there is a predetermined air inlet gap between the end face of the drive motor 3 and the outer side surface of the bottom wall 1a, and at least a part of the sound insulation cotton 103 is exposed from the side of the drive motor 3. In this embodiment, the annular air inlet groove 101 is also provided. When the drive motor 3 is assembled at the bottom of the exhaust chamber 1, in order to avoid the sound insulation cotton 103 affecting the air intake efficiency, the annular air inlet groove 101 is designed. The annular air inlet groove 101 can make the gas flow into the air inlet hole 50 from the air intake gap between the end face of the drive motor 3 and the bottom wall of the exhaust chamber 1 as soon as possible, thereby improving the air intake efficiency.

[0055] On the other hand, Fig.12 As shown, the embodiment of the utility model further provides a micro vacuum device, including a micro vacuum pump A and a controller B connected to the drive motor 3 of the vacuum pump A for controlling the working state of the drive motor 3, wherein the micro vacuum pump is the micro vacuum pump of the above embodiment. In this embodiment, the micro vacuum device adopts the above micro vacuum pump A, which can effectively reduce the volume, production cost and working noise.

[0056] In addition, the exhaust chamber includes a cylinder body with a plurality of cylinder chambers that are connected vertically and isolated from each other, a bottom shell and a valve plate that are respectively sealed to the bottom and top ends of the cylinder body, a top cover that is sealed to the top end of the valve plate, and a leather cup assembly assembled between the cylinder body and the bottom shell, the air inlet nozzle and the air inlet hole are both arranged on the bottom shell, the vacuum breaking assembly 7 is assembled in the bottom shell, the output shaft of the drive motor extends from the bottom surface of the bottom shell into the interior 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-shaped tine for movably covering the 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 ends of each cylinder chamber and are mutually sleeved in the cylinder chamber, an eccentric shaft is provided at the bottom end of the swing frame, the bottom end of the eccentric shaft is fixed on the rotating seat 54, and the central axes of the eccentric shaft and the output shaft 30 are obliquely intersected; multiple parts located outside the cylinder chamber are clamped and fixed by the valve plate and the cylinder body.

[0057] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all belong to the protection scope of the utility model.

Claims

1. A micro vacuum pump, comprising a collecting and exhausting chamber provided with an air inlet nozzle and an exhaust hole, a driving motor with an output shaft passing through the bottom wall of the collecting and exhausting chamber and extending into the collecting and exhausting chamber, and a vacuum breaking component assembled in the collecting and exhausting chamber, wherein the vacuum breaking component comprises: An air inlet hole formed through the bottom wall of the exhaust collecting chamber; A pressing plate movably sleeved on the section of the output shaft located in the collecting and exhausting chamber and used for movably covering the air inlet hole; A rotating seat coaxially fixedly assembled on the output shaft and located on a side of the pressing plate away from the bottom wall, wherein a pivot frame is protruding from an outer side surface of the rotating seat; The middle section is a centrifugal swing arm pivoted on the pivot frame by means of a pivot, the pivot is perpendicular to the output shaft, the center of gravity of the centrifugal swing arm is set at an end away from the output shaft, and the end of the centrifugal swing arm close to the output shaft is formed with a pressing portion for pressing and positioning the pressing plate at a covering position corresponding to the sealing covering of the air inlet when the centrifugal swing arm rotates with the output shaft; and A resetting elastic member, used for pushing the pressing plate to a through position where the air inlet hole is connected to the inner cavity of the collecting and exhausting chamber; It is characterized in that a through hole is opened in the middle of the pressure plate, the output shaft passes through the through hole, a positioning groove is provided on the side of the pressing portion facing the pressure plate, a ball is assembled in the positioning groove, and a part of the ball protrudes from the notch of the positioning groove and presses on the pressure plate.

2. The micro vacuum pump according to claim 1, characterized in that: A limiting plate is assembled on the outer side of the notch of the positioning groove to limit the ball in the positioning groove, and a window is opened on the limiting plate for a part of the ball to protrude outward, and the window is a circle with a diameter smaller than the diameter of the ball or a regular polygon with an inscribed circle diameter smaller than the diameter of the ball.

3. The micro vacuum pump according to claim 1, characterized in that: The width of the notch is slightly smaller than the diameter of the ball, and the ball is squeezed from the notch into the positioning groove.

4. The micro vacuum pump according to claim 1, characterized in that: The centrifugal rocker arm includes a connecting portion located in the middle and having a pivot hole at one end for the pivot to pass through, a counterweight end formed by bending from the end of the connecting portion with the pivot hole and extending toward a side away from the output shaft, and the pressing portion formed by bending and extending from the end of the connecting portion away from the pivot hole.

5. The micro vacuum pump according to claim 4, characterized in that: A plurality of pivot frames are symmetrically arranged on the outer side surface of the rotating seat around the central axis of the rotating seat, one centrifugal swing rod is pivotally arranged on each pivot frame, and the pressing parts of each centrifugal swing rod are rotationally symmetrically distributed around the output shaft.

6. The micro vacuum pump according to claim 1 or 5, characterized in that: The pressure plate and the bottom surface of the rotating seat have a gap in the axial direction of the output shaft, the end of the pressing portion is inserted into the gap, and when the output shaft does not rotate, the pressing portion abuts against the bottom surface of the rotating seat under the push of the reset elastic member.

7. The micro vacuum pump according to claim 4, characterized in that: The counterweight end is provided with a receiving groove, in which a counterweight block made of a high specific gravity material is embedded. The bottom wall of the receiving groove is also provided with an operating opening which is connected to the inner cavity of the receiving groove and allows a corresponding tool to be inserted to push the counterweight block out of the notch of the receiving groove.

8. The micro vacuum pump according to claim 1, characterized in that: A sealing gasket is provided at a position of the pressure plate on one side of the bottom wall facing the air inlet; a guide hole axially parallel to the output shaft is also provided on the pressure plate, and a guide rod parallel to the output shaft and correspondingly penetrated into the guide hole is provided on the bottom wall correspondingly.

9. The micro vacuum pump according to claim 1, characterized in that: The outer side surface of the bottom wall of the exhaust chamber is provided with an annular air inlet groove which is connected with the outer end opening of the air inlet hole and is arranged around the output shaft. The annular air inlet groove is installed with sound insulation cotton at the position connected with the outer end opening of the air inlet hole. When the drive motor is assembled at the bottom of the exhaust chamber, there is a predetermined air intake gap between the end face of the drive motor and the outer side surface of the bottom wall, and at least a portion of the sound insulation cotton is exposed from the side of the drive motor.

10. A micro vacuum device, comprising a micro vacuum pump and a controller connected to a driving motor of the micro vacuum pump for controlling the working state of the driving motor, characterized in that: The micro vacuum pump is a micro vacuum pump as described in any one of claims 1 to 9.

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