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 rotating seat, a first channel is formed in an output shaft of the driving motor, and a second channel is formed in the rotating seat; and a sealing plug; the second channel comprises a guiding section and a control section, the tail end of the guiding section is located at the position, away from the first channel, of the rotating base, the tail end of the control section is located at the position, close to the first channel, of the rotating base and communicates with an inner cavity of the air collecting and exhausting chamber, and a through hole is formed in the control section. The sealing plug is arranged in the control section in a sliding mode and located between the via hole and the tail end of the control section, and a sealing part used for sealing the via hole is formed in the position, right facing the via hole, of the middle of the surface of the side, facing the via hole, of the sealing plug. And an air guide groove communicated with the spaces on the two opposite sides of the sealing plug is further formed in the part, located on the periphery of the sealing part, of the sealing plug or in the inner side wall of the control section. According to the embodiment, the assembly difficulty and the production cost can be reduced.

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 widely used in industry or commerce are not applicable, and micro vacuum devices are required. Existing micro vacuum devices are usually composed of a micro vacuum pump and a controller.

[0003] An existing micro vacuum pump comprises: an exhaust chamber provided with an air inlet nozzle and an exhaust hole, a driving motor assembled at one end of the exhaust chamber and having an output shaft passing through the end wall of the adjacent end of the exhaust chamber and extending into the inner cavity of the exhaust chamber, and a rotating seat assembled at the end of the output shaft; in order to achieve vacuum extraction and exhaust, the output shaft is a hollow shaft having a first channel running axially therethrough; a second channel is formed inside the rotating seat, one end of which is connected to the first channel and the other end of which is connected to the inner cavity of the exhaust chamber; a sealing plug for controlling the opening and closing of the second channel and a spring for urging the sealing plug to open the second channel are also provided in the second channel; when the micro vacuum pump needs to evacuate a vacuum, the output shaft of the driving motor rotates, causing the sealing plug to generate centrifugal force to overcome the elastic force of the spring and block the second channel; when the vacuum needs to be broken, the centrifugal force of the sealing plug weakens, and the spring pushes the sealing plug to move toward the first channel to reset and open the second channel.

[0004] However, the inventors found in a specific embodiment that it is difficult for the elastic force design of the spring to achieve an ideal state. When vacuuming, the side of the sealing plug close to the first channel is connected to the outside atmosphere and has a relatively large atmospheric pressure, while the other side of the sealing plug is connected to the almost vacuum inner cavity of the collecting and exhaust chamber, and is subjected to much smaller air pressure. When the vacuum needs to be broken, due to the pressure difference between the inside and the outside, the elastic force of the spring must overcome the resistance caused by the pressure difference to push the sealing plug to move. If the elastic force is too small, it will not be able to effectively push the sealing plug to break the vacuum. However, if the elastic force of the spring is designed to be too large, when vacuuming, a relatively large centrifugal force must be generated to overcome the elastic force to push the sealing plug to block the second channel. It can be seen that the existing solution not only requires the provision of a spring, but also has more components and is inconvenient to assemble, and the design precision of the spring is higher, which is relatively troublesome. All of these are not conducive to reducing the cost of the product. 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 design and can effectively ensure the smoothness of vacuuming and breaking the vacuum.

[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 the difficulty of assembly and design.

[0007] In order to solve the above technical problems, the present utility model embodiment first provides the following technical solutions: a miniature vacuum pump, comprising:

[0008] An exhaust chamber provided with an air inlet nozzle and an exhaust hole;

[0009] A driving motor assembled at one end of the exhaust chamber, wherein the output shaft of the driving motor passes through the end wall of the adjacent end of the exhaust chamber and extends into the inner cavity of the exhaust chamber, and the output shaft is a hollow shaft having a first passage running axially therethrough;

[0010] A rotating seat assembled at the end of the output shaft, wherein a second channel is formed inside the rotating seat, one end of which is connected to the first channel and the other end of which is connected to the inner cavity of the exhaust gas collecting chamber; and

[0011] A sealing plug disposed in the second channel and used to control the opening and closing of the second channel;

[0012] The second channel includes a guide section and a control section which are connected in sequence, the starting end of the guide section is connected to the first channel and the end is located on the rotating seat away from the first channel, the starting end of the control section is connected to the end of the guide section, the end of the control section is located on the rotating seat close to the first channel and is connected to the inner cavity of the exhaust chamber, a conducting hole with an aperture smaller than the aperture of the inner cavity of the control section is formed inside the starting end of the control section, the sealing plug is slidably disposed in the control section and is located between the conducting hole and the end of the control section, a sealing portion for sealing the conducting hole is formed at a portion of the sealing plug facing the conducting hole at a middle portion of a side surface thereof, and an air guide groove connecting the spaces on opposite sides of the sealing plug is provided at a portion of the sealing plug located outside the sealing portion or between the inner side wall of the control section and the peripheral side of the sealing plug facing the inner side wall.

[0013] Furthermore, a connecting hole connected to the inner cavity of the exhaust chamber is formed on the side surface of the control section away from the conducting hole, and a stop protrusion protrudes toward the conducting hole in the middle of the end surface of the control section away from the conducting hole, and the sealing plug is stopped and positioned by the stop protrusion when sliding in the direction away from the conducting hole, and an annular guide groove is formed between the side surface of the stop protrusion and the inner wall of the control section, and the air guide groove and the connecting hole are both connected to the annular guide groove.

[0014] Furthermore, the inner hole of the control section is a stepped hole with one end being thicker and the other end being thinner, and the guide section is connected with the thick hole end, a valve body with the conducting hole opened at the center is assembled in the thick hole end, a first sealing ring is arranged between the outer peripheral surface of the valve body and the inner wall of the thick hole end, the conducting hole is opposite to the thin hole end of the control section, the sealing plug is assembled in the thin hole end, and the end of the thin hole end away from the thick hole end is communicated with the inner cavity of the exhaust chamber.

[0015] Furthermore, a middle portion of a surface of one side of the valve body facing the sealing plug protrudes correspondingly to form a boss, and a corresponding end opening of the conducting hole is opened in the middle portion of the boss.

[0016] Furthermore, the rotating seat comprises:

[0017] A base body, wherein a shaft hole corresponding to the end of the output shaft is provided in the middle of the base body, and an inner hole is formed inside the base body, which extends from the shaft hole to the outer side surface of the first side of the base body and forms an outlet on the outer side surface of the first side, and the rough hole end of the control section also forms an inlet corresponding to the outer side surface of the first side of the base body;

[0018] For the side cover fixed to the outside of the outer side surface of the first side of the base and covering the outlet of the inner hole and the entrance of the rough hole end, a through groove corresponding to the outlet of the inner hole and the entrance of the rough hole end is also provided on the inner side surface of the side cover or the outer side surface of the first side of the base, and the inner hole and the through groove together constitute the guide section.

[0019] Furthermore, a card slot is formed on the first side of the base, and the opposite side edges of the side cover respectively protrude toward the base to form elastic hooks, and the side cover is fixed to the base by hooking the elastic hooks into the card slots. The inner side surface of the side cover abuts against the outer side surface of the first side of the base and a second sealing gasket is provided at the abutting surfaces of the two, and the outlet of the inner hole, the inlet of the rough hole end and the through groove are all located on the inner side of the second sealing gasket.

[0020] Furthermore, the elastic hook is T-shaped, including an elastic arm protruding from the corresponding side edge of the side cover and a hook arm formed at the end of the elastic arm and extending to opposite sides perpendicular to the elastic arm; the elastic arm is correspondingly accommodated in the slot, and the hook arm is correspondingly hooked on the outer periphery of the notch of the slot at one end away from the side cover.

[0021] Furthermore, the rotating seat includes a counterweight block arranged on a second side of the base body opposite to the first side.

[0022] Furthermore, a sealing gasket made of elastic material and used to constitute the sealing portion is provided in the middle of the surface of one side of the sealing plug facing the guide hole.

[0023] 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.

[0024] After adopting the above technical scheme, the embodiment of the utility model has at least the following beneficial effects: the second channel of the embodiment of the utility model is composed of a guide section and a control section, and the end of the guide section is located on the rotating seat at a position away from the first channel, and the starting end of the control section is connected with the end of the guide section through a conducting hole. When the output shaft of the driving motor drives the rotating seat to rotate, the sealing plug slidingly arranged in the control section moves toward the conducting hole under the action of centrifugal force, thereby sealing and covering the conducting hole, and the outside atmosphere cannot pass through the first channel and the second channel to connect the inner cavity of the collecting and exhaust chamber, thereby realizing the vacuum operation of the micro vacuum pump; when the output shaft of the driving motor gradually stops rotating, the centrifugal force on the sealing plug decreases until it disappears, and the relatively large air pressure of the outside atmosphere automatically pushes the sealing plug located in the control section through the first channel, and finally allows air to enter the inner cavity of the collecting and exhaust chamber to realize the vacuum exhaust operation. The overall structure is very simple, no spring is required, and the assembly and design are very simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] 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.

[0027] Figure 3 The utility model is a schematic diagram of the disassembled structure of a rotating seat of an optional embodiment of the micro vacuum pump.

[0028] Figure 4The figure is a schematic cross-sectional structure diagram of a base body of an optional embodiment of the micro vacuum pump of the utility model.

[0029] Figure 5 The utility model is a schematic diagram of the structure of a valve body of an optional embodiment of the micro vacuum pump.

[0030] Figure 6 The figure is a schematic structural diagram of an optional embodiment of the end cover of the micro vacuum pump of the utility model.

[0031] Figure 7 This is a schematic cross-sectional structure diagram of an optional embodiment of the micro vacuum pump of the utility model when the sealing plug covers the conducting hole.

[0032] Figure 8 This is a schematic cross-sectional structure diagram of an optional embodiment of the micro vacuum pump of the utility model when the sealing plug does not cover the conducting hole.

[0033] Fig. 9 It is a cross-sectional schematic diagram of a rotating seat of an optional embodiment of the micro vacuum pump of the utility model.

[0034] Fig.10 This is a module schematic diagram of an optional embodiment of the micro vacuum device of the utility model. DETAILED DESCRIPTION

[0035] 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.

[0036] like Figure 1-Figure 9 As shown, an optional embodiment of the utility model provides a micro vacuum pump A, comprising:

[0037] An exhaust chamber 1 having an air inlet nozzle 10 and an exhaust hole 12;

[0038] A driving motor 3 assembled at one end of the exhaust chamber 1, wherein an output shaft 30 of the driving motor 3 passes through an end wall of an adjacent end of the exhaust chamber 1 and extends into the inner cavity 14 of the exhaust chamber 1, and the output shaft 30 is a hollow shaft having a first passage 301 extending therethrough in the axial direction;

[0039] A rotating seat 5 assembled at the end of the output shaft 3, wherein the rotating seat 5 has a second channel 50 formed therein, one end of which is connected to the first channel 301 and the other end of which is connected to the inner cavity 10 of the exhaust chamber 1; and

[0040] A sealing plug 7 disposed in the second channel 50 and used to control the opening and closing of the second channel 50;

[0041] The second channel 50 includes a guide section 501 and a control section 503 which are connected in sequence. The starting end of the guide section 501 is connected to the first channel 301 and the end is located on the rotating seat 5 away from the first channel 301. The starting end of the control section 503 is connected to the end of the guide section 501. The end of the control section 503 is located on the rotating seat 5 close to the first channel 301 and is connected to the inner cavity 14 of the exhaust chamber 1. The starting end of the control section 503 has an aperture smaller than the inner cavity aperture of the control section 503. The sealing plug 7 is slidably disposed in the control section 503 and is located between the conductive hole 505 and the end of the control section 503. The sealing plug 7 has a sealing portion 70 for sealing the conductive hole 505 at a portion of a side surface thereof facing the conductive hole 505, and an air guide groove 503a connecting the spaces on opposite sides of the sealing plug 7 is provided at a portion of the sealing plug 7 located outside the sealing portion 70 or between the inner side wall of the control section 503 and the peripheral side surface of the sealing plug 7 facing the inner side wall.

[0042] The second channel 50 of the utility model embodiment is composed of a guide section 501 and a control section 503, and the end of the guide section 501 is located on the rotating seat at a position away from the first channel 301, and the starting end of the control section 503 is connected with the end of the guide section 501 through the conducting hole 505. When the output shaft 30 of the driving motor 3 drives the rotating seat 5 to rotate, the sealing plug 7 slidingly arranged in the control section 503 moves toward the conducting hole 505 under the action of centrifugal force, thereby sealing and covering the conducting hole 505, and the outside atmosphere cannot pass through the first channel 301 and the second channel to connect the inner cavity 14 of the collecting and exhaust chamber 1, thereby realizing the vacuum operation of the micro vacuum pump; when the output shaft 30 of the driving motor 3 gradually stops rotating, the centrifugal force on the sealing plug 7 decreases until it disappears, and the relatively large air pressure of the outside atmosphere automatically pushes the sealing plug 7 located in the control section 503 through the first channel 301, and finally allows air to enter the inner cavity 14 of the collecting and exhaust chamber 1 to realize the vacuum exhaust operation. The overall structure is very simple, no spring is required, and the assembly and design are very simple.

[0043] In a specific implementation, the arrangement of the air guide groove 503a can be flexibly changed according to design requirements. For example, an air guide groove 503a (such as Figure 4As shown); or, an air guide groove 503a is provided on the peripheral side of the sealing plug 7; or, an air guide groove 503 is formed by a gap between the peripheral side of the sealing plug 7 and the inner wall of the control section 503. Of course, in this scheme, it is necessary to reasonably design the sealing plug 7 so that the size of the sealing plug 7 is slightly smaller than the inner cavity size of the control section 503, and the area of ​​the sealing portion 70 is also larger than the area of ​​the orifice area of ​​the conducting hole 505, so as to ensure that the sealing plug 7 can slide back and forth relative to the conducting hole 505 in the control section 503, but will not flip over or the sealing portion 7 cannot be aligned with the conducting hole 505 to implement sealing.

[0044] In an optional embodiment of the present invention, Figure 4 , Figure 7-Figure 9 As shown, a connecting hole 506 connected to the inner cavity 14 of the exhaust chamber 1 is formed on the side surface of the control section 503 away from the conducting hole 505, and a stopping protrusion 507 is protruded toward the conducting hole 505 in the middle of the end surface of the control section 503 away from the conducting hole 505, and the sealing plug 7 is stopped and positioned by the stopping protrusion 507 when sliding in the direction away from the conducting hole 505, and an annular guide groove 508 is formed between the side surface of the stopping protrusion 507 and the inner wall of the control section 503, and the air guide groove 503a and the connecting hole 506 are both connected to the annular guide groove 508. In this embodiment, a stopping protrusion 507 is provided in the control section 503 to effectively stop the limiting sealing plug 7, and the annular guide groove 508 on the side of the stopping protrusion 507 connects the air guide groove 503a and the connecting hole 506 to ensure the connectivity of the air path, avoid the sealing plug 7 blocking the air path, and effectively realize vacuum exhaust.

[0045] In an optional embodiment of the present invention, Figure 3-Figure 5 , Figure 7-Figure 8 As shown, the inner hole of the control section 503 is a stepped hole with one end being thicker and the other end being thinner, and the thick hole end is connected to the guide section 501, and a valve body 8 with the conducting hole 505 opened at the center is assembled in the thick hole end, and a first sealing ring 80 is arranged between the outer peripheral surface of the valve body 8 and the inner wall of the thick hole end, and the conducting hole 505 is directly opposite to the thin hole end of the control section 503, and the sealing plug 7 is assembled in the thin hole end, and the end of the thin hole end away from the thick hole end is connected to the inner cavity 14 of the collecting and exhausting chamber 1. In this embodiment, the valve body 8 is assembled in the control section 503, and the conducting hole 505 on the valve body 8 is movably sealed by the sealing plug 7, so that the structure is relatively simple; and the valve body 8 and the sealing plug 7 are respectively installed by the thick hole end and the thin hole end of the control section 503, so that effective positioning can also be achieved. In a specific implementation, an embedding groove can be arranged on the outer peripheral surface of the valve body 8 and / or the inner wall of the thick hole end to position the first sealing ring 80.

[0046] In an optional embodiment of the present invention, Figure 5 , Figure 7-Figure 8 As shown, the middle part of the surface of one side of the valve body 8 facing the sealing plug 7 is correspondingly protruded to form a boss 82, and the corresponding end opening of the conducting hole 505 is opened in the middle part of the boss 82. In this embodiment, by further providing the boss 82 on the valve body 8, the boss 82 can abut against the sealing plug 7, thereby improving the sealing effect of the sealing plug 7 on the conducting hole 505.

[0047] In an optional embodiment of the present invention, Figure 3-Figure 4 , Figure 7-Figure 8 As shown, the rotating seat 5 includes: a base 52, a shaft hole 521 corresponding to the end of the output shaft 30 is provided in the middle of the base 52, and an inner hole 523 is formed inside the base 52, which extends from the shaft hole 521 to the outer side surface of the first side of the base 52 and forms an outlet on the outer side surface of the first side, and the rough hole end of the control section 503 also forms an inlet corresponding to the outer side surface of the first side of the base 52;

[0048] For the side cover 54 fixed to the outside of the outer side surface of the first side of the base 52 and covering the outlet of the inner hole 523 and the entrance of the rough hole end, a through groove 541 corresponding to the outlet of the inner hole 523 and the entrance of the rough hole end is also provided on the inner side surface of the side cover 54 or the outer side surface of the first side of the base 52, and the inner hole 523 and the through groove 541 together constitute the guide section 501.

[0049] In this embodiment, the rotating seat 5 is assembled by a base 52 and a side cover 54. An axial hole 521 and an inner hole 523 are provided on the base 52, and a through groove 541 is formed on the inner side surface of the side cover 54, so as to facilitate the molding of the guide section 501. At the same time, it is convenient for the sealing plug 7 and the valve body 8 to be installed in the control section 503. Moreover, the second channel 50 is L-shaped as a whole, which extends the gas path and reduces the noise generated when the gas passes through.

[0050] In an optional embodiment of the present invention, Figure 3 , Figure 6As shown, the first side of the base 52 is also formed with a slot 525, and the opposite two sides of the side cover 54 protrude toward the base 52 to form elastic hooks 543, and the side cover 54 is fixed to the base 52 by correspondingly hooking the elastic hooks 543 in the slots 525. The inner side surface of the side cover 54 abuts against the outer side surface of the first side of the base 52, and a second sealing gasket 545 is provided at the abutting surface of the two, and the outlet of the inner hole 523, the inlet of the rough hole end and the through groove 541 are all located on the inner side of the second sealing gasket 545. In this embodiment, the elastic hook 543 of the side cover 54 and the slot 525 of the base 52 are hooked and matched with each other, so that the side cover 54 can be quickly assembled, and the outlet of the inner hole 523, the inlet of the rough hole end and the through groove 541 are effectively sealed by providing the second sealing gasket 545. In a specific implementation, a bezel groove may be provided on the inner side surface of the side cover 54 and / or the outer side surface of the first side of the base body 52 to position the second sealing gasket 545 .

[0051] In an optional embodiment of the present invention, Figure 3 , Figure 6 As shown, the elastic hook 543 is T-shaped, including an elastic arm 543a protruding from the corresponding side edge of the side cover 54 and a hook arm 543b extending perpendicularly to the elastic arm 543a to opposite sides at the end of the elastic arm 543a; the elastic arm 543a is correspondingly accommodated in the slot 525, and the hook arm 543b is correspondingly hooked on the outer peripheral edge of the slot of the slot 525 away from the side cover 54. In this embodiment, the elastic hook 543 adopts a T-shaped design. During the specific assembly, it is only necessary to make the elastic arm 543a slightly elastically deformed, and then the elastic arm 543a is correspondingly accommodated in the slot 525, and at the same time, the hook arm 543b is hooked to the outer peripheral edge of the slot of the slot 525, and the assembly can be completed.

[0052] In an optional embodiment of the present invention, Figure 3 , Figure 7-Figure 8 As shown, the rotating seat 5 includes a counterweight 56 ​​disposed on the second side of the base 52 opposite to the first side. In this embodiment, a balancing counterweight 56 ​​adapted to the weight of the sealing plug 7 can be provided to balance the weights on the opposite sides of the rotating seat 5, thereby ensuring the smooth rotation of the rotating seat 5. In a specific implementation, a corresponding receiving groove can also be provided to position the counterweight 56.

[0053] In an optional embodiment of the present invention, Figure 3 , Figure 7-Figure 8As shown, a sealing gasket made of elastic material is provided in the middle of the surface of the sealing plug 7 facing the conducting hole 505, which is used to constitute the sealing portion 70. In this embodiment, by providing a sealing gasket as the sealing portion 70, the sealing effect of the sealing plug 7 on the conducting hole 505 is improved to avoid leakage and other problems during vacuum operation. In a specific implementation, the sealing gasket can be made of elastic materials such as rubber and silicone.

[0054] On the other hand, Figure 8 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.

[0055] 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 5, 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.

[0056] 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 miniature vacuum pump, comprising: An exhaust chamber provided with an air inlet nozzle and an exhaust hole; A driving motor assembled on the outer side of one end of the collecting and exhausting chamber, wherein the output shaft of the driving motor passes through the end wall of the adjacent end of the collecting and exhausting chamber and extends into the inner cavity of the collecting and exhausting chamber, and the output shaft is a hollow shaft having a first passage running through the inside along the axial direction; A rotating seat assembled at the end of the output shaft, wherein a second channel is formed inside the rotating seat, one end of which is connected to the first channel and the other end of which is connected to the inner cavity of the exhaust chamber; and A sealing plug disposed in the second channel and used to control the opening and closing of the second channel; It is characterized in that the second channel includes a guide section and a control section connected in sequence, the starting end of the guide section is connected to the first channel and the end is located on the rotating seat away from the first channel, the starting end of the control section is connected to the end of the guide section, the end of the control section is located on the rotating seat close to the first channel and is connected to the inner cavity of the collecting and exhausting chamber, a conducting hole with an aperture smaller than the aperture of the inner cavity of the control section is formed inside the starting end of the control section, the sealing plug is slidably disposed in the control section and is located between the conducting hole and the end of the control section, a sealing portion for sealing the conducting hole is formed at a portion of the sealing plug facing the conducting hole at a middle portion of a side surface thereof, and facing the conducting hole, and an air guide groove connecting the spaces on opposite sides of the sealing plug is provided at a portion of the sealing plug located outside the sealing portion or between the inner side wall of the control section and the peripheral side of the sealing plug facing the inner side wall.

2. The micro vacuum pump according to claim 1, characterized in that: A connecting hole connected to the inner cavity of the exhaust chamber is formed on the side surface of the control section away from the conducting hole, and a stopping protrusion protrudes toward the conducting hole at the middle of the end surface of the control section away from the conducting hole. The sealing plug is stopped and positioned by the stopping protrusion when sliding in the direction away from the conducting hole, and an annular guide groove is formed between the side surface of the stopping protrusion and the inner wall of the control section, and the air guide groove and the connecting hole are both connected to the annular guide groove.

3. The micro vacuum pump according to claim 1 or 2, characterized in that: The inner hole of the control section is a stepped hole with one end being thicker and the other end being thinner, and the thick hole end is connected to the guide section, a valve body with the conducting hole opened at the center is assembled in the thick hole end, a first sealing ring is arranged between the outer peripheral surface of the valve body and the inner wall of the thick hole end, the conducting hole is opposite to the thin hole end of the control section, the sealing plug is assembled in the thin hole end, and the end of the thin hole end away from the thick hole end is communicated with the inner cavity of the collecting and exhausting chamber.

4. The micro vacuum pump according to claim 3, characterized in that: The middle part of one side surface of the valve body facing the sealing plug protrudes correspondingly to form a boss, and the corresponding end opening of the conducting hole is arranged in the middle part of the boss.

5. The micro vacuum pump according to claim 3, characterized in that: The rotating seat comprises: A base body, wherein a shaft hole corresponding to the end of the output shaft is provided in the middle of the base body, and an inner hole is formed inside the base body, which extends from the shaft hole to the outer side surface of the first side of the base body and forms an outlet on the outer side surface of the first side, and the rough hole end of the control section also forms an inlet corresponding to the outer side surface of the first side of the base body; For the side cover fixed to the outside of the outer side surface of the first side of the base and covering the outlet of the inner hole and the entrance of the rough hole end, a through groove corresponding to the outlet of the inner hole and the entrance of the rough hole end is also provided on the inner side surface of the side cover or the outer side surface of the first side of the base, and the inner hole and the through groove together constitute the guide section.

6. The micro vacuum pump according to claim 5, characterized in that: A card slot is also formed on the first side of the base, and the opposite side edges of the side cover protrude toward the base to form elastic hooks. The side cover is fixed to the base by hooking the elastic hooks into the card slots. The inner side surface of the side cover abuts against the outer side surface of the first side of the base, and a second sealing gasket is provided at the abutting surfaces of the two. The outlet of the inner hole, the inlet of the rough hole end and the through groove are all located on the inner side of the second sealing gasket.

7. The micro vacuum pump according to claim 6, characterized in that: The elastic hook is T-shaped, including an elastic arm protruding from the corresponding side edge of the side cover and a hook arm extending to opposite sides perpendicular to the elastic arm at the end of the elastic arm; the elastic arm is correspondingly accommodated in the slot, and the hook arm is correspondingly hooked on the outer periphery of the notch of the slot away from the side cover.

8. The micro vacuum pump according to claim 5, characterized in that: The rotating seat includes a counterweight disposed on a second side of the base body opposite to the first side.

9. The micro vacuum pump according to claim 1, characterized in that: A sealing gasket made of elastic material and used to form the sealing part is arranged in the middle of the surface of one side of the sealing plug facing the guide hole.

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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