Miniature vacuum pump

Abstract

The micro vacuum pump comprises a cylinder body, a diaphragm, a valve plate, a top cover and a driving assembly, the diaphragm, the valve plate, the top cover and the driving assembly are sequentially assembled at one end of the cylinder body in a stacked mode, the periphery of the diaphragm is clamped and fixed by the cylinder body and the valve plate, an air collecting and exhausting cavity is formed between the valve plate and the diaphragm, and a partition piece is further arranged between the top cover and the valve plate. The top cover is provided with an air inlet nozzle communicated with the air inlet cavity, and the valve plate is provided with a first conduction control piece for controlling airflow to flow from the air inlet cavity to the air collecting and exhausting cavity in a one-way mode and a second conduction control piece for controlling airflow to flow from the air collecting and exhausting cavity to the air exhausting cavity in a one-way mode. A first airflow channel and a second airflow channel are formed in the positions, close to the edges, of the valve plate and the cylinder body correspondingly, the first airflow channel is isolated from the air collecting and exhausting cavity, one end of the first airflow channel communicates with the air exhausting cavity, and the other end of the first airflow channel is in sealed butt joint with one end of the second airflow channel. And the cylinder wall of the cylinder body is provided with an exhaust channel communicated with the cylinder chamber and the external atmosphere. According to the embodiment, the working noise can be effectively reduced.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of micro air pumps, and in particular to 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 pumps to perform vacuum operations. Due to different requirements for performance indicators such as power, vacuum degree, service life, noise, volume, and safety, large vacuum pumps that are widely used in industry or commerce are not applicable, and micro vacuum pumps are required.

[0003] An existing micro vacuum pump comprises a bottom shell, a cylinder body, a valve plate and a top cover which are sequentially stacked and assembled on the top end of the bottom shell, a diaphragm assembled in the cylinder chamber of the cylinder body and clamped and fixed by the cylinder body and the valve plate, and a driving member for driving the diaphragm to move to realize exhaust and collection, the valve plate and the diaphragm form an exhaust and collection chamber, the side walls of the top cover are respectively provided with an air inlet nozzle and an exhaust nozzle, the top wall of the top cover protrudes toward the valve plate to form a diaphragm which divides the space between the top cover and the valve plate into an air inlet chamber and an exhaust chamber, the air inlet chamber is connected to the air inlet nozzle, the exhaust chamber is connected to the exhaust nozzle, the valve plate is also respectively provided with a first air hole connected to the air inlet chamber and a second air hole connected to the exhaust chamber, the valve plate is also respectively provided with a first umbrella ding for covering the first air hole and a second umbrella ding for covering the second air hole, the first umbrella ding is accommodated in the exhaust and collection chamber, and the second umbrella ding is accommodated in the exhaust chamber.

[0004] However, the inventors found in the specific embodiments that when the micro vacuum pump is performing a vacuuming operation, the air sucked out from the space to be vacuumed enters the air inlet cavity from the air inlet nozzle, then enters the air collecting and exhausting cavity through the first air hole after the first umbrella is pushed open, then enters the exhausting cavity through the second air hole after the second umbrella is pushed open, and finally is discharged out of the pump body through the exhaust nozzle. The air collecting and exhausting air path of the micro vacuum pump is relatively narrow and short, and lacks a noise reduction structure, resulting in a large noise during operation. 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 effectively reduce working noise.

[0006] In order to solve the above technical problems, the embodiment of the utility model provides the following technical solutions: a miniature vacuum pump, comprising a cylinder body, a diaphragm, a valve plate and a top cover which are sequentially stacked and assembled at one end of the cylinder body, and a driving component which is assembled at one side of the cylinder body and one end of which extends into the cylinder chamber of the cylinder body to drive the diaphragm to reciprocate, the periphery of the diaphragm is clamped and fixed by the cylinder body and the valve plate, an exhaust chamber is formed between the valve plate and the diaphragm, a partition is further provided between the top cover and the valve plate for dividing the space between the top cover and the valve plate into an intake chamber and an exhaust chamber, and a An air intake nozzle, a first conduction control component for controlling the unidirectional flow of air from the air intake chamber to the exhaust chamber and a second conduction control component for controlling the unidirectional flow of air from the exhaust chamber to the exhaust chamber are assembled on the valve plate, a first airflow channel and a second airflow channel are respectively opened at the edge positions of the valve plate and the cylinder body, the first airflow channel is isolated from the exhaust chamber and one end is connected to the exhaust chamber and the other end is sealed and connected to one end of the second airflow channel, the other end of the second airflow channel is connected to the cylinder chamber, and an exhaust channel connecting the cylinder chamber and the external atmosphere is provided on the cylinder wall of the cylinder body.

[0007] Furthermore, a noise reduction tube made of sound insulation cotton is assembled in the exhaust chamber, and the opposite ends of the noise reduction tube are respectively abutted against the top cover and the valve plate, and the outlet of the second conduction control component is connected to the inner cavity of the noise reduction tube.

[0008] Furthermore, the first conduction control component includes a first air hole opened on the valve plate and corresponding to the first air inlet cavity, and a first umbrella tine movably inserted on the valve plate, the umbrella cover of the first umbrella tine is located in the exhaust cavity and movably covers the first air hole, and the second conduction control component includes a second air hole opened on the valve plate and a second umbrella tine movably inserted on the valve plate, the umbrella cover of the second umbrella tine is located in the exhaust cavity and movably covers the second air hole, and the umbrella cover of the second umbrella tine is also stored in the noise reduction tube.

[0009] Furthermore, the partition is a conduit protruding from the inner side of the top cover toward the valve plate, the tube cavity of the conduit constitutes the air inlet cavity and one end is connected to the inner end opening of the air inlet nozzle, and the valve plate is provided with an annular groove around the first conduction control member on the side facing the top cover, and a first sealing gasket is embedded in the annular groove, and the terminal end face of the conduit is pressed against the first sealing gasket.

[0010] Furthermore, a plurality of the first air flow channels are provided at predetermined positions on the side edge of the valve plate, and a second air flow channel is provided on the cylinder wall of the cylinder body corresponding to each of the first air flow channels.

[0011] Furthermore, the cylinder body includes a bottom shell and a cylinder barrel assembled at an opening at one end of the bottom shell, the diaphragm is assembled correspondingly on the outer end surface of the cylinder barrel, the second air flow channel includes a guide hole opened in the cylinder wall and correspondingly connected to the first air flow channel, and a confluence groove opened on the end surface of the cylinder barrel facing one end of the bottom shell and correspondingly connected to multiple adjacent guide holes, the confluence groove is connected to the cylinder chamber, and the exhaust channel includes an exhaust hole opened on the bottom shell and a first joint between the bottom shell and the cylinder barrel.

[0012] Furthermore, a connecting groove connecting the confluence groove and the cylinder chamber is formed on the end surface of the bottom shell that is connected to the cylinder barrel at a position corresponding to the confluence groove.

[0013] Furthermore, an orientation column is provided on a side surface of the valve plate facing the top cover at a position deviating from the center, and an orientation sleeve is correspondingly provided on the inner wall of the top cover for plugging and cooperating with the orientation column to determine the assembly direction of the top cover, and a second sealing gasket is also provided between the valve plate and the top cover for sealing the gap between the valve plate and the top cover.

[0014] Furthermore, an axial hole is provided on one side wall of the bottom shell, and the driving assembly includes a driving motor assembled on the outside of the side wall of the bottom shell provided with the axial hole and extending into the cylinder chamber with an output shaft passing through the axial hole, an eccentric wheel provided in the cylinder chamber and assembled with the end of the output shaft, a connecting rod whose bottom end is pivotally provided on the eccentric wheel by means of a bearing, and a clamping plate cooperating with the top end of the connecting rod to clamp the diaphragm from two opposite sides, a predetermined gap is provided between the end face of the driving motor and the shell wall of the bottom shell, the exhaust channel also includes the axial hole and the predetermined gap, and the exhaust hole is also provided on the side wall of the bottom shell provided with the axial hole.

[0015] Furthermore, the bottom shell is formed by splicing a front shell and a rear shell, and the exhaust passage also includes a second joint seam between the front shell and the rear shell.

[0016] After adopting the above technical scheme, the embodiment of the utility model has at least the following beneficial effects: the embodiment of the utility model respectively opens the first airflow channel and the second airflow channel at the edge positions of the valve plate and the cylinder body, and corresponds to the cylinder chamber connecting the exhaust chamber and the cylinder body. After the airflow enters the exhaust chamber from the collecting and exhausting chamber, it will further pass through the first airflow channel and the second airflow channel and enter the cylinder chamber, and finally be discharged through the exhaust channel on the cylinder wall. On the one hand, the flow path of the airflow is extended, and on the other hand, the larger volume of the cylinder chamber can be effectively utilized to buffer the absorbed airflow. The combined effect of the two aspects can effectively reduce the noise of the micro vacuum pump during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] 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.

[0019] Figure 3 The schematic diagram is a cross-sectional structure diagram of an optional embodiment of the micro vacuum pump of the utility model along the central axis of a first air hole.

[0020] Figure 4 The schematic diagram is a cross-sectional structure diagram of an optional embodiment of the micro vacuum pump of the utility model along the central axis of a second air hole.

[0021] Figure 5 This is a schematic cross-sectional structure diagram of an optional embodiment of the micro vacuum pump of the utility model along the central axis of two first air flow channels.

[0022] Figure 6 This is a schematic structural diagram of an optional embodiment of the micro vacuum pump of the utility model after the top cover is turned over.

[0023] Figure 7 This is a schematic structural diagram of a valve plate of an optional embodiment of the micro vacuum pump of the utility model.

[0024] Figure 8 This is a schematic structural diagram of an optional embodiment of the micro vacuum pump of the utility model after the cylinder is turned over.

[0025] Fig. 9 The present invention is a schematic diagram of the cross-sectional structure of the central axis surface of the output shaft of a driving motor of an optional embodiment of the micro vacuum pump of the utility model. DETAILED DESCRIPTION

[0026] 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.

[0027] like Figure 1-Figure 7As shown, an optional embodiment of the utility model provides a micro vacuum pump, including a cylinder body 1, a diaphragm 2, a valve plate 3 and a top cover 4 which are sequentially stacked and assembled at one end of the cylinder body 1, and a driving component 5 which is assembled at one side of the cylinder body 1 and one end of which extends into the cylinder chamber 10 of the cylinder body 1 to drive the diaphragm 2 to reciprocate, a collecting and exhausting chamber 30 is formed between the valve plate 3 and the diaphragm 2, a partition 40 is further provided between the top cover 4 and the valve plate 3 for dividing the space between the top cover 4 and the valve plate 3 into an air intake chamber 40a and an exhaust chamber 40b, an air intake nozzle 42 which is connected to the air intake chamber 40a is provided on the top cover 4, and a valve plate 3 is assembled with a control device for controlling the airflow from the top cover 4 to the exhaust chamber 40b. The first conduction control component 32 for unidirectional flow from the air intake chamber 40a to the exhaust chamber 30 and the second conduction control component 34 for controlling the unidirectional flow of the air from the exhaust chamber 30 to the exhaust chamber 40b, the first air flow channel 36 and the second air flow channel 12 are respectively opened at the edge positions of the valve plate 3 and the cylinder body 1, the first air flow channel 36 is isolated from the exhaust chamber 30 and one end is connected to the exhaust chamber 40b and the other end is sealed and connected to one end of the second air flow channel 12, the other end of the second air flow channel 12 is connected to the cylinder chamber 10, and the cylinder wall of the cylinder body 1 is provided with an exhaust channel 14 connecting the cylinder chamber 10 and the external atmosphere.

[0028] In the embodiment of the utility model, a first air flow channel 36 and a second air flow channel 12 are respectively opened at the edge positions of the valve plate 3 and the cylinder body 1, and the corresponding cylinder chamber 10 connects the exhaust chamber 40b and the cylinder body 1. After the airflow enters the exhaust chamber 40b from the collecting and exhausting chamber 30, it will further pass through the first air flow channel 36 and the second air flow channel 12 and enter the cylinder chamber 10, and finally be discharged through the exhaust channel 14 on the cylinder wall. On the one hand, the flow path of the airflow is extended, and on the other hand, the larger volume of the cylinder chamber 10 can be effectively utilized to buffer the absorbed airflow. The combined effect of the two aspects can effectively reduce the noise of the micro vacuum pump during operation.

[0029] In an optional embodiment of the present invention, Figures 1 to 5As shown, a noise reduction tube 44 made of sound insulation cotton is also assembled in the exhaust chamber 40b, and the opposite ends of the noise reduction tube 44 are respectively abutted against the top cover 4 and the valve plate 3, and the outlet of the second conduction control member 34 is connected to the inner cavity of the noise reduction tube 44. In this embodiment, a noise reduction tube 44 made of sound insulation cotton is arranged in the exhaust chamber 40b, and the top and bottom ends of the noise reduction tube 44 are also respectively abutted against the top cover 4 and the valve plate 3. Due to the material characteristics, the cylinder wall of the noise reduction tube 44 has a large number of pores. Therefore, the airflow flowing from the exhaust chamber 30 through the conduction control member 34 to the noise reduction tube 44 will flow out through the cylinder wall of the noise reduction tube 44, and the noise reduction tube 44 performs preliminary noise reduction processing on the airflow, which can effectively improve the overall noise reduction performance. In specific implementation, a plurality of the second conduction control members 34 can be arranged on the valve plate 3, and the outlets of the plurality of the second conduction control members 34 are connected to the inner cavity of the same noise reduction tube 44.

[0030] In an optional embodiment of the present invention, Figures 1 to 5 As shown, the first conduction control member 32 includes a first air hole 321 opened on the valve plate 3 and correspondingly located in the air inlet cavity 40a, and a first umbrella 323 movably inserted on the valve plate 3, the umbrella cover of the first umbrella 323 is located in the exhaust gas collecting cavity 30 and movably covers the first air hole 321, and the second conduction control member 34 includes a second air hole 341 opened on the valve plate 3 and a second umbrella 343 movably inserted on the valve plate 3, the umbrella cover of the second umbrella 343 is located in the exhaust cavity 40b and movably covers the second air hole 341, and the umbrella cover of the second umbrella 343 is also stored in the noise reduction tube 44. In this embodiment, the umbrella 34 is used to movably cover the corresponding air hole, and when the air flow passes through the air hole, the corresponding umbrella 34 is pushed open to realize the unidirectional flow of gas, which has a simple structure and is easy to realize.

[0031] In a specific implementation, a group of multiple air holes that are opened or closed under the control of the same umbrella tine are usually provided on the valve plate corresponding to each umbrella tine, and the umbrella handle of each umbrella tine is correspondingly inserted into a central air hole in the same group of air holes. In addition, other elements that realize one-way air permeability and conduction can also be used to form the first conduction control element 32 and the second conduction control element 34, such as: a one-way air permeable membrane, a one-way valve, or an electromagnetic valve that intermittently conducts under the control of a corresponding control signal and can effectively cooperate with the driving component 5 to drive the diaphragm to realize one-way flow of airflow, etc.

[0032] In an optional embodiment of the present invention, Figures 1 to 5 and Figure 7As shown, the partition 40 is a conduit protruding from the inner side of the top cover 4 toward the valve plate 3, the lumen of the conduit 40 constitutes the air inlet cavity 40a and one end is connected to the inner hole of the air inlet nozzle 42, and the valve plate 3 is provided with an annular groove 38 around the first conduction control member 32 on the side facing the top cover 4, and a first sealing gasket 381 is embedded in the annular groove 38, and the terminal end face of the conduit 40 is pressed against the first sealing gasket 381. In this embodiment, a conduit protruding from the inner side of the top cover 4 toward the valve plate 3 is used as the separator 40, and the end face of the conduit 40 is directly used to press against the first sealing gasket 381 arranged around the first conduction control member 32, so as to achieve a sealed connection between the conduit 40 and the first air hole 32, thereby ensuring the sealing of the air path; and the conduit 40 is small in size, which can minimize the space occupied by the air inlet cavity 40a between the top cover 4 and the valve plate 3, so that the first air flow channels 36 can be arranged as much as possible on the valve plate 3, thereby increasing the gas flow rate.

[0033] In a specific implementation, a partition protruding from the inner side of the top cover 4 toward the valve plate 3 can also be used to divide the space between the top cover 4 and the valve plate 3 into an air intake chamber 40a and an exhaust chamber 40b. Then, the first air flow channel 36 is arranged on the side of the valve plate 3 corresponding to the exhaust chamber 40b, which can also realize the function of the partition 40.

[0034] In an optional embodiment of the present invention, Figures 1 to 5 and Figure 7 As shown, a plurality of first airflow channels 36 are provided at predetermined positions on the side edge of the valve plate 3, and a second airflow channel 12 is provided on the cylinder wall of the cylinder body 1 corresponding to each first airflow channel 12. In this embodiment, by providing the first airflow channels 36 at predetermined positions on the side edge of the valve plate 3, and ensuring that the second airflow channels 12 correspond to the first airflow channels 30 one by one, the exhaust efficiency of the airflow can be improved and the noise can be reduced.

[0035] In an optional embodiment of the present invention, Figures 1 to 8As shown, the cylinder body 1 includes a bottom shell 15 and a cylinder barrel 16 assembled at an opening at one end of the bottom shell 15, the outer end surface of the cylinder barrel 16 is correspondingly assembled with the diaphragm 2, the second air flow channel 12 includes a guide hole 121 opened in the cylinder wall of the cylinder barrel 16 and correspondingly connected to the first air flow channel 36, and a confluence groove 123 opened on the end surface of the cylinder barrel 16 facing the bottom shell 15 and correspondingly connected to multiple adjacent guide holes 121, the confluence groove 123 is connected to the cylinder chamber 10, and the exhaust channel 14 includes an exhaust hole 141 opened on the bottom shell 15 and a first joint 143 between the bottom shell 15 and the cylinder barrel 16. In this embodiment, the cylinder body 1 is composed of a bottom shell 15 and a cylinder barrel 16, and the second air flow channel 12 is formed by the guide holes 121 and the confluence groove 123 on the wall of the cylinder barrel 16. The structure is simple, and the setting of the confluence groove 123 avoids the edge of the cylinder barrel 16 and the top of the bottom shell 15 from being in surface contact with each other after assembly, thereby covering the second air flow channel 12, thereby ensuring that the second air flow channel 12 can be smoothly connected to the cylinder chamber 10; in addition, the exhaust holes 141 on the bottom shell 15 and / or the joint 143 between the bottom shell 15 and the cylinder barrel 16 can be used to achieve gas discharge, and the structure is very simple.

[0036] In an optional embodiment of the present invention, Figures 1 to 8 As shown, a connecting groove 151 for connecting the confluence groove 123 and the cylinder chamber 10 is formed on the end surface of the bottom shell 15 at a position corresponding to the confluence groove 123. In this embodiment, a connecting groove 151 is also provided at a position of the bottom shell 15 corresponding to the confluence groove 123, so as to facilitate the airflow to enter the cylinder chamber 10 quickly and smoothly and reduce the working noise of the vacuum pump. It is particularly suitable to provide the connecting groove 151 at a position where the shell wall thickness of the bottom shell 15 is greater than the barrel wall thickness of the cylinder barrel 16, so as to avoid the end face of the bottom shell from blocking the confluence groove 123 and affecting the airflow entering the cylinder chamber 10.

[0037] In an optional embodiment of the present invention, Figures 1 to 5 As shown, a directional column 39 is provided on a side plate surface of the valve plate 3 facing the top cover 4 at a position deviating from the center, and a directional sleeve 46 is correspondingly provided on the inner wall of the top cover 4 for plugging and matching with the directional column 39 to determine the assembly direction of the top cover 4, and a second sealing gasket 6 for sealing the gap between the valve plate 3 and the top cover 4 is also provided between the valve plate 3 and the top cover 4. In this embodiment, the directional column 39 and the directional sleeve 46 are directional plugged, which facilitates and accurately realizes the directional assembly of the valve plate 3 and the top cover 4; and the second sealing gasket 6 is also provided between the valve plate 3 and the top cover 4 to ensure effective sealing between the valve plate 3 and the top cover 4.

[0038] In a specific implementation, the first sealing gasket 381 can be integrally connected with the second sealing gasket 6 to improve assembly efficiency. At the same time, grooves can also be provided on the corresponding sides of the valve plate 3 and / or the top cover 4 to position the second sealing gasket 6.

[0039] In an optional embodiment of the present invention, Figures 1 to 5 and Fig. 9 As shown, an axial hole 153 is also provided on one side of the shell wall of the bottom shell 15, and the driving assembly 5 includes a driving motor 50 assembled on the outside of the shell wall of the side of the bottom shell 15 with the axial hole 153 and extending into the cylinder chamber 10 with an output shaft 501, an eccentric wheel 52 arranged in the cylinder chamber 10 and assembled at the end of the output shaft 501 of the driving motor 50, a connecting rod 56 whose bottom end is pivotally mounted on the eccentric wheel 52 by means of a bearing 54, and a clamping plate 58 cooperating with the top end of the connecting rod 56 to clamp the diaphragm 2 from two opposite sides, a predetermined gap 501 is provided between the end face of the driving motor 50 and the shell wall of the bottom shell 15, the exhaust channel 14 also includes the axial hole 153 and the predetermined gap 501, and the exhaust hole 141 is also provided on the shell wall of the side of the bottom shell 15 with the axial hole 153. In this embodiment, an eccentric wheel 52 is installed on the output shaft 501 of the driving motor 50, and is matched with a bearing 54 and a connecting rod 56. The top end of the connecting rod 56 is matched with a clamping plate 58 to connect the diaphragm 2, which can effectively drive the diaphragm 2 to perform periodic reciprocating motion, thereby achieving air extraction and exhaust. It can be understood that various devices that can be used to drive the diaphragm 2 to perform periodic reciprocating motion can be used as the driving member 5, and are not limited to the examples of this embodiment; in addition, Figure 3 As shown, during the specific installation, there is an exhaust gap 501 between the end face of the driving motor 50 and the side surface of the bottom shell 1, and the output shaft 501 of the driving motor 50 and the axial hole 153 on the bottom shell 1 are not sealed and assembled. The exhaust hole 141 is also preferably arranged on the side wall of the bottom shell 15 where the axial hole 513 is opened. The airflow in the cylinder chamber 10 enters the exhaust gap 501 through the exhaust hole 141 and the axial hole 153 and is then discharged. The exhaust hole 141 is effectively hidden, and foreign matter from the outside can be prevented from entering the cylinder chamber 10 through the exhaust hole 141 to affect the normal operation of movable components such as the output shaft 501, the eccentric wheel 52, the connecting rod 56 and the diaphragm 2.

[0040] In an optional embodiment of the present invention, Figure 3 As shown, the bottom shell 15 is formed by splicing a front shell 155 and a rear shell 157, and the exhaust passage 14 also includes a second joint 145 between the front shell 155 and the rear shell 157. In this embodiment, the second joint 145 formed when the front shell 155 and the rear shell 157 are spliced ​​and assembled is reasonably utilized for exhaust, so that more exhaust paths are provided, the exhaust efficiency and noise reduction effect are improved, and the exhaust gas path is relatively concealed, which will not affect the manufacturing cost.

[0041] In specific implementation, Figures 1 to 3 As shown, the air inlet nozzle 42 protrudes from a side wall of the top cover 4 close to the drive motor 50, and the axial direction of the air inlet nozzle 42 is parallel to the output shaft 501. In this embodiment, the air inlet nozzle 42 is arranged on a side wall of the top cover 4 close to the drive motor 50, and the axial direction of the air inlet nozzle 42 is parallel to the output shaft 501, so that the lateral space of the top cover 4 is used to arrange the air inlet nozzle 42, thereby reducing the occupied volume of the overall micro vacuum pump.

[0042] 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 a cylinder body, a diaphragm, a valve plate and a top cover which are sequentially stacked and assembled at one end of the cylinder body, and a driving assembly which is assembled at one side of the cylinder body and has one end extending into the cylinder chamber of the cylinder body to drive the diaphragm to reciprocate, wherein the periphery of the diaphragm is clamped and fixed by the cylinder body and the valve plate, an exhaust chamber is formed between the valve plate and the diaphragm, a partition is further provided between the top cover and the valve plate for dividing the space between the top cover and the valve plate into an intake chamber and an exhaust chamber, an intake nozzle which is connected to the intake chamber is provided on the top cover, a first conduction control member which controls the unidirectional flow of air from the intake chamber to the exhaust chamber and a second conduction control member which controls the unidirectional flow of air from the exhaust chamber to the exhaust chamber are assembled on the valve plate, characterized in that: The valve plate and the cylinder body are respectively provided with a first airflow channel and a second airflow channel at their edges. The first airflow channel is isolated from the exhaust chamber and one end of the first airflow channel is connected to the exhaust chamber while the other end is sealed and docked with one end of the second airflow channel. The other end of the second airflow channel is connected to the cylinder chamber. An exhaust channel connecting the cylinder chamber and the external atmosphere is provided on the cylinder wall of the cylinder body.

2. The micro vacuum pump according to claim 1, characterized in that: A noise reduction tube made of sound insulation cotton is assembled in the exhaust cavity, and the opposite ends of the noise reduction tube are respectively abutted against the top cover and the valve plate, and the outlet of the second conduction control component is connected to the inner cavity of the noise reduction tube.

3. The micro vacuum pump according to claim 2, characterized in that: The first conduction control component includes a first air hole opened on the valve plate and correspondingly located in the air inlet cavity, and a first umbrella tine movably inserted on the valve plate, the umbrella cover of the first umbrella tine is located in the exhaust gas collecting cavity and movably covers the first air hole, the second conduction control component includes a second air hole opened on the valve plate and a second umbrella tine movably inserted on the valve plate, the umbrella cover of the second umbrella tine is located in the exhaust gas collecting cavity and movably covers the second air hole, and the umbrella cover of the second umbrella tine is also stored in the noise reduction tube.

4. The micro vacuum pump according to claim 1, characterized in that: The partition is a conduit protruding from the inner side of the top cover toward the valve plate, the lumen of the conduit constitutes the air inlet cavity and one end is connected to the inner end opening of the air inlet nozzle, the valve plate is provided with an annular groove around the first conduction control member on the side facing the top cover, a first sealing gasket is embedded in the annular groove, and the terminal end face of the conduit is pressed against the first sealing gasket.

5. The micro vacuum pump according to claim 1 or 4, characterized in that: A plurality of the first air flow channels are provided at predetermined positions on the side edge of the valve plate, and a second air flow channel is provided on the cylinder wall of the cylinder body corresponding to each of the first air flow channels.

6. The micro vacuum pump according to claim 5, characterized in that: The cylinder body includes a bottom shell and a cylinder barrel assembled at an opening at one end of the bottom shell, the diaphragm is assembled correspondingly on the outer end surface of the cylinder barrel, the second air flow channel includes a guide hole opened in the cylinder wall of the cylinder barrel and correspondingly connected to the first air flow channel, and a confluence groove opened on the end surface of the cylinder barrel facing one end of the bottom shell and correspondingly connected to multiple adjacent guide holes, the confluence groove is connected to the cylinder chamber, and the exhaust channel includes an exhaust hole opened on the bottom shell and a first joint between the bottom shell and the cylinder barrel.

7. The micro vacuum pump according to claim 6, characterized in that: A connecting groove for connecting the confluence groove and the cylinder chamber is formed on the end surface of the bottom shell that is connected to the cylinder barrel at a position corresponding to the confluence groove.

8. The micro vacuum pump according to claim 1, characterized in that: An directional column is provided on one side of the valve plate facing the top cover at a position deviating from the center, and an directional sleeve is correspondingly provided on the inner wall of the top cover for plugging and cooperating with the directional column to determine the assembly direction of the top cover, and a second sealing gasket is also provided between the valve plate and the top cover for sealing the gap between the valve plate and the top cover.

9. The micro vacuum pump according to claim 6, characterized in that: An axial hole is also provided on one side wall of the bottom shell, and the driving assembly includes a driving motor assembled on the outside of the side wall of the bottom shell provided with the axial hole and extending into the cylinder chamber with an output shaft passing through the axial hole, an eccentric wheel provided in the cylinder chamber and assembled at the end of the output shaft, a connecting rod whose bottom end is pivotally mounted on the eccentric wheel by means of a bearing, and a clamping plate cooperating with the top end of the connecting rod to clamp the diaphragm from two opposite sides, a predetermined gap is provided between the end face of the driving motor and the shell wall of the bottom shell, the exhaust channel also includes the axial hole and the predetermined gap, and the exhaust hole is also provided on the side wall of the bottom shell provided with the axial hole.

10. The micro vacuum pump according to claim 6, characterized in that: The bottom shell is formed by splicing a front shell and a rear shell, and the exhaust passage also includes a second joint seam between the front shell and the rear shell.

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