Vacuum pump

Abstract

The utility model discloses a vacuum pump which comprises a pump body and more than two air bag assemblies located in the pump body. The pressing plate, the valve plate and the cover plate are sequentially mounted on the pump body; air inlet holes and air outlet holes are formed in the positions, corresponding to the air bag assemblies, of the pressing plate. A one-way air inlet valve is formed on the valve plate corresponding to the air inlet hole, and a one-way air outlet valve is formed on the valve plate corresponding to the air outlet hole; an air cavity is formed in the side, facing the valve plate, of the cover plate, an air baffle is arranged in the air cavity and divides the air cavity into an air inlet cavity and an air outlet cavity, the air inlet cavity is communicated with the one-way air inlet valve, and the air outlet cavity is communicated with the one-way air outlet valve. An air inlet and an air outlet are further formed in the cover plate, and the air inlet is communicated with the air inlet cavity; the air outlet is communicated with the air outlet cavity; the air inlet cavity and the air outlet cavity are formed in the cover plate, so that the cover plate has an air distribution function, and the whole structure of the vacuum pump is more compact.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumps, in particular to a vacuum pump. Background Art

[0002] A vacuum pump is a device used to generate, improve and maintain a vacuum environment. It extracts gas molecules from a closed space through mechanical, physical or physicochemical methods to reduce the gas pressure in the space, so as to achieve the purpose of creating and maintaining a high vacuum environment. The working principles of vacuum pumps are diverse, including piston type, vane type, molecular pump, vortex pump, screw pump and other types. Each type has its specific application occasions and advantages, and has shown great application value in many fields such as semiconductor manufacturing, chemical industry, aerospace, medical treatment, food and scientific research.

[0003] The existing vacuum pump has a complex structure and a large size, making it difficult to adapt to a small environment. In addition, its structure is mainly composed of a pump housing, a drive device, a one-way valve and a single air bag. Its working principle is to periodically compress and release the air bag through the drive device, and cooperate with the one-way valve to control the gas flow direction, so as to achieve the effect of creating a vacuum or near-vacuum environment. However, since it only relies on a single air bag to achieve the purpose of inflation and deflation, the traditional vacuum pump not only limits the continuity and efficiency of gas flow, but also makes it difficult to meet the needs of rapid response and high-efficiency work, limiting its application in fine control situations. Once the air bag is damaged, the entire vacuum pump system will not be able to continue to work normally, and has low reliability and poor stability. Utility Model Content

[0004] The utility model aims to provide a vacuum pump to solve the problems of low working efficiency, low reliability and poor stability of the vacuum pump in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A vacuum pump, comprising:

[0007] A pump body and two or more air bag assemblies, wherein the air bag assemblies are located in the pump body;

[0008] A pressure plate, a valve plate, and a cover plate, wherein the pressure plate, the valve plate, and the cover plate are sequentially mounted on the pump body;

[0009] The pressure plate is provided with an air inlet hole and an air outlet hole at locations corresponding to each airbag assembly; the valve plate is provided with a one-way air inlet valve at locations corresponding to the air inlet hole, and a one-way air outlet valve at locations corresponding to the air outlet hole;

[0010] An air cavity is formed on one side of the cover plate facing the valve plate, an air baffle is provided in the air cavity, the air baffle divides the air cavity into an air inlet cavity and an air outlet cavity, the air inlet cavity is connected to the one-way air inlet valve, and the air outlet cavity is connected to the one-way air outlet valve;

[0011] The cover plate is also provided with an air inlet and an air outlet, wherein the air inlet is communicated with the air inlet cavity; and the air outlet is communicated with the air outlet cavity.

[0012] According to the above technical means, the utility model separates the paths of air intake and air outlet by arranging an air baffle on the cover plate to prevent the two airflows from mixing, thereby reducing the resistance and energy consumption during the gas flow process, improving the overall work efficiency, and making the cover plate also have a gas separation function, making the overall structure of the vacuum pump more compact. By arranging more than two airbag assemblies and a one-way air inlet valve and a one-way air outlet valve corresponding to each airbag assembly, it is possible to increase not only the continuity and efficiency of the gas flow in the pump body, but also the air extraction rate and response speed of the vacuum pump, improve the work efficiency, and reduce the dependence on the airbag assembly; when one of the airbag assemblies is damaged, the vacuum pump can still work normally under the action of the other airbag assemblies, which improves the stability and reliability of the vacuum pump, making the vacuum pump have potential value in fine control scenarios that require rapid establishment or maintenance of a vacuum environment.

[0013] An efficient gas flow control system is formed in the pump body through the pressure plate, valve plate, cover plate, air inlet hole, air outlet hole, one-way air inlet valve and one-way air outlet valve, which is used to achieve stable establishment and maintenance of vacuum environment, with compact structure, good stability and high working efficiency.

[0014] Furthermore, the number of the airbag assemblies is four groups, and each group of airbag assemblies is evenly distributed in the pump body.

[0015] According to the above technical means, the performance advantages of the vacuum pump are further enhanced by adopting four groups of airbag assemblies and evenly distributing them in the pump body. It not only ensures the uniform flow of gas in the pump body, but also further improves the pumping rate and efficiency through the coordinated work of multiple groups of airbags. At the same time, the evenly distributed airbag assemblies also improve the overall stability and durability of the pump body and extend its service life.

[0016] Furthermore, the air baffle is an annular structure, the air outlet cavity is located on the inner side of the air baffle, and the air inlet cavity is located on the outer side of the air baffle.

[0017] According to the above technical means, the air outlet cavity and the air inlet cavity are separated by an annular air baffle plate, thereby realizing the separation and guidance of the gas. The annular air baffle plate acts as a barrier to prevent the untreated gas in the air inlet cavity from directly mixing into the air outlet cavity, thereby improving the purity and processing efficiency of the gas. At the same time, it also optimizes the airflow path, making the air intake smoother and the air outlet more concentrated, further enhancing the overall performance and stability of the pump body.

[0018] Furthermore, the air inlet and the air outlet are located on a side of the cover plate away from the pump body.

[0019] According to the above technical means, the air inlet and the air outlet are located on the side away from the pump body, so that the gas can pass through the air inlet and the air outlet more directly and quickly when entering and exhausting the pump body, thereby reducing energy consumption and noise and facilitating connection with external pipelines or equipment, thereby improving the overall flexibility of the vacuum pump system, having a simple structure, and being easy to use and install.

[0020] Furthermore, the air outlet is located at the center of the cover plate, and the air inlet is offset from the center of the cover plate.

[0021] According to the above technical means, the air outlet is located at the center of the cover plate, which ensures that the gas can be discharged in the shortest path after being fully processed inside the pump body, thereby improving the exhaust efficiency and stability. The air inlet is located away from the center of the cover plate, so that the inhaled external gas enters the pump body in a more uniform and wider manner, reducing the turbulence and energy consumption caused by the direct impact of the airflow on the central area, thereby improving the overall working performance of the pump body.

[0022] Furthermore, a receiving cavity is formed on the pressure plate corresponding to the valve plate, and the valve plate is adapted to the receiving cavity and installed in the receiving cavity.

[0023] According to the above technical means, the accommodating cavity on the pressure plate ensures that the valve plate can be accurately and firmly installed in the specified position, which facilitates the installation of the valve plate, and increases the sealing and stability between the valve plate and the pressure plate, preventing gas leakage and improving the overall compactness of the vacuum pump.

[0024] Furthermore, it also includes connecting screws, and the pressure plate, valve plate and cover plate are installed on the pump body through the connecting screws.

[0025] According to the above technical means, the pressure plate, valve plate and cover plate are firmly installed on the pump body by connecting screws, thereby enhancing the stability and sealing of the vacuum pump structure. The connecting screws, as key connecting elements, ensure the close fit between the various components and facilitate installation and maintenance.

[0026] Furthermore, it also includes a valve disc, and the valve disc is configured to drive each of the airbag components to operate in turn.

[0027] According to the above technical means, the valve disc is used to drive the movement of the airbag assembly to achieve the purpose of inflation and deflation. Under the action of the valve disc, each airbag assembly can be inflated and deflated according to the set order and frequency, thereby achieving continuity and high efficiency of gas flow. The valve disc drives each airbag assembly in turn, which not only avoids wear and failure caused by excessive use of a single airbag, but also enables the pump body to maintain stable performance output during continuous operation, thereby improving work efficiency, extending service life and reducing operating costs.

[0028] Furthermore, the valve disc includes a turntable and an eccentric top plate, the eccentric top plate is mounted on the turntable, and the turntable can drive the eccentric top plate to rotate so that the eccentric top plate squeezes the airbag assembly in turn.

[0029] According to the above technical means, the eccentric top plate is driven to rotate by the turntable to achieve the purpose of squeezing the airbag components in turn, thereby realizing precise control and efficient circulation of the gas flow inside the vacuum pump. Specifically, during the rotation of the turntable, the eccentric top plate can periodically and selectively apply pressure to each airbag component in turn along the rotation path, thereby driving them to perform inflation and deflation actions in turn, and the structure is simple.

[0030] Furthermore, it also includes a driving motor, which is connected to the turntable and is used to drive the turntable to rotate.

[0031] According to the above technical means, the turntable is accurately controlled by the driving motor to rotate smoothly at the set speed and direction, thereby driving the eccentric top plate to realize the alternating squeezing of the airbag assembly. It has a simple structure and is easy to operate, providing a stable, controllable and efficient power source for the vacuum pump.

[0032] Beneficial effects achieved by the utility model:

[0033] 1. The utility model separates the paths of air inlet and air outlet by arranging an air baffle on the cover plate to prevent the two airflows from mixing, thereby reducing the resistance and energy consumption during the gas flow process, improving the overall working efficiency, making the cover plate also have an air separation function, and making the overall structure of the vacuum pump more compact.

[0034] 2. The utility model provides more than two airbag assemblies and a one-way air inlet valve and a one-way air outlet valve corresponding to each airbag assembly, which not only increases the continuity and efficiency of the gas flow in the pump body, but also improves the pumping rate and response speed of the vacuum pump, improves the working efficiency, and reduces the dependence on the airbag assembly. If one of the airbag assemblies is damaged, the vacuum pump can still work normally under the action of the other airbag assemblies, thereby improving the stability and reliability of the vacuum pump, making the vacuum pump have potential value in fine control scenarios that need to quickly establish or maintain a vacuum environment.

[0035] 3. The utility model forms an efficient gas flow control system in the pump body through the pressure plate, valve plate, cover plate, air inlet hole, air outlet hole, one-way air inlet valve and one-way air outlet valve, which is used to achieve stable establishment and maintenance of vacuum environment, with compact structure, good stability and high working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is an exploded view of the pump body, air bag assembly, pressure plate, valve plate and cover plate of the utility model;

[0037] Figure 2 It is an exploded view of the pressure plate, air bag assembly, pump body, valve disc and drive motor of the utility model;

[0038] Figure 3 This is a schematic diagram of the structure of the cover plate of the utility model facing the valve plate;

[0039] Figure 4 It is a structural schematic diagram of the valve disc of the utility model.

[0040] Among them, 1-pump body; 2-airbag assembly; 3-pressure plate; 31-air inlet hole; 32-air outlet hole; 33-accommodating chamber; 4-valve plate; 41-one-way air inlet valve; 42-one-way air outlet valve; 5-cover plate; 51-air baffle plate; 52-air inlet cavity; 53-air outlet cavity; 54-air inlet; 55-air outlet; 6-connecting screws; 7-valve disc; 71-turntable; 72-eccentric top plate; 8-driving motor.

[0041] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The same or similar numbers correspond to the same or similar parts. The terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limitations on this patent. Specific embodiments

[0042] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific embodiments should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0044] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0045] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0046] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0047] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0048] The technical solution of the present utility model is described in detail below in conjunction with the specific drawings.

[0049] This embodiment relates to a vacuum pump, such as Figure 1As shown, it comprises: a pump body 1, two or more airbag assemblies 2, wherein the airbag assemblies 2 are located in the pump body 1; a pressure plate 3, a valve plate 4, and a cover plate 5, wherein the pressure plate 3, the valve plate 4, and the cover plate 5 are sequentially mounted on the pump body 1; an air inlet 31 and an air outlet 32 ​​are formed on the pressure plate 3 corresponding to each airbag assembly 2; a one-way air inlet valve 41 is formed on the valve plate 4 corresponding to the air inlet 31, and a one-way air outlet valve 42 is formed corresponding to the air outlet 32; the cover plate An air cavity is formed on one side of the valve plate 4, and an air baffle plate 51 is provided in the air cavity. The air baffle plate 51 divides the air cavity into an air inlet cavity 52 and an air outlet cavity 53. The air inlet cavity 52 is communicated with the one-way air inlet valve 41, and the air outlet cavity 53 is communicated with the one-way air outlet valve 42. An air inlet port 54 and an air outlet port 55 are also provided on the cover plate 5. The air inlet port 54 is communicated with the air inlet cavity 52, and the air outlet port 55 is communicated with the air outlet cavity 53.

[0050] In this embodiment, each airbag assembly 2 is expanded or contracted and under the action of the one-way air inlet valve 41 and the one-way air outlet valve 42 corresponding to each airbag assembly 2, the purpose of air intake and air exhaust in the pump body 1 is achieved, which can not only increase the continuity and efficiency of the gas flow in the pump body 1, but also improve the air extraction rate and response speed of the vacuum pump, improve the working efficiency, reduce the dependence on the airbag assembly 2, and improve the stability and reliability of the vacuum pump. Specifically, during operation, when each airbag assembly 2 is expanded, external gas enters the air intake chamber 52 through the air inlet port 54, and then under the control of the one-way air inlet valve 41, Gas is only allowed to flow into the corresponding air inlet 31 and then into the corresponding airbag assembly 2 in one direction to achieve inflation. When each airbag assembly 2 contracts, the gas in the airbag assembly 2 is discharged through the air outlet 32 ​​on the pressure plate 3, and is guided to the air outlet cavity 53 through the corresponding one-way air outlet valve 42, and finally discharged out of the pump through the air outlet 55, forming a continuous airflow circulation. It can be understood that in this process, the air baffle 51 effectively separates the air inlet and outlet paths, avoids the mixing of the two airflows, ensures the one-way flow of the airflow, and improves the working efficiency and stability of the vacuum pump; wherein, the airbag assembly 2 is preferably an elastic airbag.

[0051] As a preferred embodiment, the number of the airbag components 2 is four groups, and each group of airbag components 2 is evenly distributed in the pump body 1; Figure 1 and Figure 2As shown, the four groups of airbag assemblies 2 are evenly distributed in the pump body 1, which further enhances the working efficiency and stability of the vacuum pump. Specifically, during operation, when each airbag assembly 2 is inflated, external gas enters the pump body 1 through the air inlet 54. Since the four groups of airbag assemblies 2 are evenly distributed, the four groups of airbag assemblies 2 can receive gas simultaneously or in turn through their corresponding air inlet holes 31 and one-way air inlet valves 41. When each airbag assembly 2 is contracted, the gas in each group of airbag assemblies 2 is discharged from the pump through the corresponding air outlet holes 32 and the one-way air outlet valves 42, thereby improving the vacuum pumping rate and efficiency, ensuring the smoothness and continuity of the gas flow in the pump body 1, thereby achieving an efficient and stable vacuum extraction effect.

[0052] As a preferred embodiment, the air baffle 51 is annular in structure, the air outlet cavity 53 is located inside the air baffle 51, and the air inlet cavity 52 is located outside the air baffle 51; Figure 3 As shown, the air outlet cavity 52 and the air inlet cavity 53 are separated by an annular air baffle plate 51, thereby achieving gas separation and guidance. The annular air baffle plate 51 acts as a barrier to prevent the untreated gas in the air inlet cavity 52 from directly mixing into the air outlet cavity 53, thereby improving the purity and processing efficiency of the gas. At the same time, it also optimizes the path of the airflow, making the air intake smoother and the air outlet more concentrated, further enhancing the overall performance and stability of the pump body.

[0053] As a preferred embodiment, the air inlet 54 and the air outlet 55 are located on a side of the cover plate 5 away from the pump body 1; Figure 1 As shown, the positions of the air inlet 54 and the air outlet 55 enable the gas to pass through the air inlet 54 and the air outlet 55 more directly and quickly when entering and exiting the pump body 1, thereby reducing energy consumption and noise and facilitating connection with external pipelines or equipment, thereby improving the overall flexibility of the vacuum pump system and simplifying the structure.

[0054] As a preferred embodiment, the air outlet 55 is located at the center of the cover plate 5, and the air inlet 54 is offset from the center of the cover plate 5; the air outlet 55 is located at the center of the cover plate 5 to ensure that the gas can be discharged in a concentrated manner along the shortest path after being fully processed inside the pump body 1, thereby improving the exhaust efficiency and stability; the air inlet 54 is located at a position offset from the center of the cover plate 5, thereby allowing the inhaled external gas to enter the pump body 1 in a more uniform and extensive manner, thereby reducing the turbulence and energy consumption caused by the direct impact of the airflow on the central area, thereby improving the overall working performance of the pump body.

[0055] In this embodiment, a receiving cavity 33 is formed on the pressure plate 3 corresponding to the valve plate 4, and the valve plate 4 is adapted to the receiving cavity 33 and installed in the receiving cavity 33; Figure 1 and Figure 2As shown, during installation, the valve plate 4 is installed on the pressure plate 3 through the accommodating cavity 33, which is convenient to install, simple in structure and good in sealing performance.

[0056] In this embodiment, it also includes connecting screws 6, and the pressure plate 3, the valve plate 4 and the cover plate 5 are installed on the pump body 1 through the connecting screws 6; Figure 2 As shown, specifically, during installation, the pressure plate 3, the valve plate 4 and the cover plate 5 are installed on the pump body 1 by connecting screws 6, which enhances the stability and sealing of the vacuum pump structure, is easy to obtain, and is convenient for installation and maintenance.

[0057] In this embodiment, a valve disc 7 is also included, and the valve disc 7 is configured to drive each of the airbag assemblies 2 to act in turn; Figure 2 As shown, under the action of the valve disc 7, each airbag assembly 2 can be inflated and deflated in a set order and frequency, thereby achieving continuity and high efficiency of gas flow. The valve disc 7 drives each airbag assembly 2 in turn, which not only avoids wear and failure caused by excessive use of a single airbag, but also enables the pump body 1 to maintain stable performance output during continuous operation, thereby improving work efficiency. Specifically, during use, when the valve disc 7 rotates, the valve disc will be aligned with the air inlet or outlet channel of each airbag assembly 2 in turn, thereby achieving rotational inflation and exhaust of the airbag assembly 2, with a simple structure and easy operation.

[0058] In this embodiment, the valve disc 7 includes a rotating disk 71 and an eccentric top plate 72. The eccentric top plate 72 is mounted on the rotating disk 71. The rotating disk 71 can drive the eccentric top plate 72 to rotate so that the eccentric top plate 72 squeezes the airbag assembly 2 in turn. Figure 4 As shown, the eccentric top plate 72 is installed on the turntable 71 through the eccentric shaft. During operation, the turntable 71 drives the eccentric top plate 72 to rotate, so that the eccentric top plate 72 periodically approaches and squeezes each airbag assembly 2. Specifically, when the eccentric top plate 72 approaches a certain airbag assembly 2, the gas in the airbag assembly 2 is squeezed out, enters the air outlet cavity 53 through the one-way air outlet valve 42 and is finally discharged out of the pump body 1. Subsequently, as the eccentric top plate 72 rotates away, the airbag assembly 2 re-inhales external gas through the air inlet hole 31 and the one-way air inlet valve 41 to complete a working cycle.

[0059] In this embodiment, a driving motor 8 is further included, and the driving motor 8 is connected to the rotating disk 71 and is used to drive the rotating disk 71 to rotate; Figure 2 As shown, the drive motor 8 provides a stable, controllable and efficient power source for the vacuum pump. During operation, the drive motor 8 drives the turntable 71 to rotate, thereby driving the eccentric top plate 72 to rotate, so as to realize the control of the alternating squeezing and inflation and deflation of each airbag assembly 2.

[0060] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A vacuum pump, characterized in that: include: A pump body (1), and two or more airbag assemblies (2), wherein the airbag assemblies (2) are located inside the pump body (1); A pressure plate (3), a valve plate (4), and a cover plate (5), wherein the pressure plate (3), the valve plate (4), and the cover plate (5) are sequentially mounted on the pump body (1); The pressure plate (3) is formed with an air inlet hole (31) and an air outlet hole (32) at a position corresponding to each air bag assembly (2); the valve plate (4) is formed with a one-way air inlet valve (41) at a position corresponding to the air inlet hole (31), and a one-way air outlet valve (42) at a position corresponding to the air outlet hole (32); An air cavity is formed on one side of the cover plate (5) facing the valve plate (4), an air baffle plate (51) is provided in the air cavity, the air baffle plate (51) divides the air cavity into an air inlet cavity (52) and an air outlet cavity (53), the air inlet cavity (52) is connected to the one-way air inlet valve (41), and the air outlet cavity (53) is connected to the one-way air outlet valve (42); The cover plate (5) is also provided with an air inlet (54) and an air outlet (55); the air inlet (54) is connected to the air inlet cavity (52); and the air outlet (55) is connected to the air outlet cavity (53).

2. The vacuum pump according to claim 1, characterized in that The number of the airbag assemblies (2) is four groups, and each group of airbag assemblies (2) is evenly distributed in the pump body (1).

3. The vacuum pump according to claim 1, characterized in that The air baffle plate (51) is an annular structure, the air outlet cavity (53) is located on the inner side of the air baffle plate (51), and the air inlet cavity (52) is located on the outer side of the air baffle plate (51).

4. The vacuum pump according to claim 1, characterized in that The air inlet (54) and the air outlet (55) are located on a side of the cover plate (5) away from the pump body (1).

5. The vacuum pump according to claim 4, characterized in that The air outlet (55) is located at the center of the cover plate (5), and the air inlet (54) is offset from the center of the cover plate (5).

6. The vacuum pump according to claim 1, characterized in that An accommodating cavity (33) is formed on the pressure plate (3) corresponding to the valve plate (4); the valve plate (4) is adapted to the accommodating cavity (33) and is installed in the accommodating cavity (33).

7. The vacuum pump according to claim 1, characterized in that It also comprises connecting screws (6), and the pressure plate (3), the valve plate (4) and the cover plate (5) are mounted on the pump body (1) via the connecting screws (6).

8. The vacuum pump according to claim 1, characterized in that It also comprises a valve disc (7), wherein the valve disc (7) is configured to drive each of the airbag assemblies (2) to operate in turn.

9. The vacuum pump according to claim 8, characterized in that The valve disc (7) comprises a rotating disk (71) and an eccentric top plate (72). The eccentric top plate (72) is mounted on the rotating disk (71). The rotating disk (71) can drive the eccentric top plate (72) to rotate so that the eccentric top plate (72) squeezes each of the airbag assemblies (2) in turn.

10. The vacuum pump according to claim 9, characterized in that It also comprises a driving motor (8), wherein the driving motor (8) is connected to the rotating disk (71) and is used to drive the rotating disk (71) to rotate.

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