Vacuum pump

Abstract

The utility model discloses a vacuum pump, which comprises a main pump body, an air flow inlet, an air flow outlet, a vacuum pump body and a vacuum pump body, wherein one side of the output end of the main pump body is provided with an air flow inlet; the flow dividing assembly is arranged on one side of the output end of the main pump body, the input end of the flow dividing assembly communicates with an airflow input opening, and the flow dividing assembly comprises a first-stage flow dividing channel and a second-stage flow dividing channel; according to the multi-stage booster pump, the design that multi-stage boosting is conducted through the flow dividing assembly is adopted, a single vacuum pump can achieve higher vacuum degree, parallel work of a plurality of pump machines is not needed any more, system design and control are simplified, and compared with a plurality of pump machines connected in parallel, the single multi-stage booster pump machine has the advantages that the cost is reduced, and the working efficiency is improved. Compared with the prior art, occupied space is smaller, equipment is simplified, installation and maintenance difficulty and cost are reduced, two-stage pressurization is formed through the sub-runner and multi-stage pressurization, energy utilization can be optimized while the vacuum degree is improved, and the problem of high energy consumption caused by simply increasing power is avoided.

Description

Technical Field

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

[0002] A negative pressure booster pump is a device used to increase the vacuum level in a vacuum system. It achieves a higher vacuum level by further reducing the pressure on the basis of the primary vacuum pump. Using a negative pressure booster pump in the vacuum chamber of a vacuum sealer can effectively increase the negative pressure, making the sealing effect better and faster.

[0003] In order to achieve a higher vacuum degree in the application of the negative pressure booster pump currently used, it is usually necessary to increase the number of pumps. This means that in practical applications, multiple pumps need to work simultaneously to achieve the desired effect. Increasing the number of pumps will increase the complexity of the equipment, occupy more space, and increase the installation and maintenance costs. In addition, the coordinated control of multiple pumps during operation is also more complicated. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a vacuum pump to solve the problems of the prior art.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] A vacuum pump comprises: a main pump body, wherein one side of the output end of the main pump body is provided with an air flow input port;

[0007] A flow splitter assembly is arranged at one side of the output end of the main pump body, the input end of the flow splitter assembly is communicated with the airflow input port, and the flow splitter assembly includes a primary flow splitter channel and a secondary flow splitter channel;

[0008] A pressure plate disposed on one side of the output end of the flow dividing assembly, a first one-way valve disposed on the pressure plate and connected to the primary flow dividing channel, a second one-way valve disposed on the pressure plate and connected to the secondary flow dividing channel, and a third one-way valve disposed on the pressure plate and connected to the secondary flow dividing channel;

[0009] A sealing cover covering the pressure plate, wherein the sealing cover is provided with a reinforcement strip surrounding the first one-way valve and the second one-way valve, and the sealing cover is provided with an output pipe connected to the third one-way valve;

[0010] The first one-way valve cooperates with the reinforcing strip to perform primary pressurization, the primary pressurized gas is introduced into the secondary branch channel through the second one-way valve for secondary pressurization, and the secondary pressurized gas flow is output through the output port through the third one-way valve.

[0011] As a further improvement, the main pump body includes an outer shell fixedly mounted on one side of the output end of the main pump body, and the airflow input port is arranged on one side of the outer shell, and is connected to the vacuum chamber inside the vacuum sealing machine through the airflow input port.

[0012] As a further improvement, the diversion assembly includes an auxiliary shell arranged on the side of the outer shell away from the main pump body, and a plurality of through holes are provided in the auxiliary shell, and rubber sleeves are inserted in the through holes. The multiple rubber sleeves are connected by rubber strips, and the multiple rubber sleeves are embedded above the auxiliary shell through the rubber strips, and the rubber sleeves inserted into different through holes respectively form a primary diversion channel and a secondary diversion channel.

[0013] As a further improvement, a sealing ring is embedded between the auxiliary shell and the outer shell.

[0014] As a further improvement, the main pump body also includes a micro motor, an eccentric wheel inserted in the output end of the micro motor, and an air pumping plate inserted in the eccentric groove of the eccentric wheel. The air pumping plate is provided with a plurality of air pumping columns, which match the through holes and abut against the bottom of the rubber sleeve when the air pumping columns move to the end.

[0015] As a further improvement, an arc-shaped through hole is opened at the bottom edge of the rubber sleeve, and an air vent is opened at the center of the end of the air pump column, and the air vent is staggered with the arc-shaped through hole.

[0016] As a further improvement, the first one-way valve controls the airflow to be output from bottom to top, the second one-way valve controls the airflow to be output from top to bottom, and the third one-way valve controls the airflow to be output from bottom to top.

[0017] As a further improvement, a plurality of bolts are also included, and the bolts penetrate the sealing cover, the pressure plate, and the auxiliary shell, and the ends of the bolts are threadedly fixed on the outer shell.

[0018] The beneficial effects of the utility model are:

[0019] The utility model adopts a multi-stage boosting design with a shunt component, so that a single vacuum pump can achieve a higher vacuum degree, and there is no need for multiple pumps to work in parallel, which simplifies system design and control. Compared with multiple parallel pumps, a single multi-stage boosting pump occupies less space, simplifies the equipment, and reduces the difficulty and cost of installation and maintenance. By forming two-stage pressurization through the shunt channel and multi-stage boosting, it is possible to optimize energy utilization while improving the vacuum degree, avoiding the high energy consumption problem caused by simply increasing the power. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 The utility model is a three-dimensional structural schematic diagram of a vacuum pump.

[0022] Figure 2 The utility model is a schematic diagram of the explosion structure of a vacuum pump.

[0023] Figure 3 The utility model is a schematic diagram of the sealing cover of a vacuum pump when viewed from above.

[0024] Figure 4 The utility model is a schematic diagram of the structure of a rubber sleeve of a vacuum pump when viewed from above.

[0025] Figure 5 The utility model is a schematic diagram of a partial explosion of a vacuum pump and gas flow.

[0026] Figure 6 The utility model is a cross-section diagram of a vacuum pump and a gas flow diagram.

[0027] 1. Main pump body; 3. Pressure plate; 31. First one-way valve; 32. Second one-way valve; 33. Third one-way valve; 4. Sealing cover; 41. Reinforcement strip; 42. Output pipe; 2. Diverter assembly; 21. Auxiliary shell; 211. Through hole; 212. Rubber sleeve; 213. Arc-shaped through hole; 214. Rubber strip; 22. Primary diverter channel; 23. Secondary diverter channel; 24. Sealing ring; 11. Micro motor; 12. Outer shell; 13. Air flow inlet; 14. Eccentric wheel; 15. Inflating plate; 16. Inflating column; 161. Vent; 5. Bolt. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0029] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In order to achieve a higher vacuum degree in the application of the negative pressure booster pump currently used, it is usually necessary to increase the number of pumps. This means that in practical applications, multiple pumps need to work simultaneously to achieve the desired effect. Increasing the number of pumps will increase the complexity of the equipment, occupy more space, and increase the installation and maintenance costs. In addition, the coordinated control of multiple pumps during operation is also more complicated.

[0031] When a higher vacuum is required, the power of the existing pump must be increased accordingly to provide sufficient pumping speed and negative pressure level. The increase in pump power directly leads to an increase in energy consumption, thereby increasing operating costs. At the same time, high-power pumps dissipate more heat during operation, placing higher requirements on the cooling system. If the heat dissipation is poor, it may also lead to a decline in pump performance or a shortened life.

[0032] Reference Figure 1-6 As shown, a vacuum pump comprises:

[0033] A main pump body 1, wherein one side of the output end of the main pump body 1 is provided with an air flow input port 13;

[0034] A flow dividing component 2 is arranged at one side of the output end of the main pump body 1, the input end of the flow dividing component 2 is communicated with the airflow input port 13, and the flow dividing component 2 includes a primary flow dividing channel 22 and a secondary flow dividing channel 23;

[0035] A pressure plate 3 is provided at one side of the output end of the flow dividing component 2, a first one-way valve 31 is provided on the pressure plate 3 and connected to the primary flow dividing channel 22, a second one-way valve 32 is provided on the pressure plate 3 and connected to the secondary flow dividing channel 23, and a third one-way valve 33 is provided on the pressure plate 3 and connected to the secondary flow dividing channel 23;

[0036] A cover 4 covering the pressure plate 3, wherein the cover 4 is provided with a reinforcement strip 41 surrounding the first one-way valve 31 and the second one-way valve 32, and the cover 4 is provided with an output pipe 42 communicating with the third one-way valve 33;

[0037] The first one-way valve 31 cooperates with the reinforcing strip 41 to perform primary pressurization, the primary pressurized gas is introduced into the secondary branch channel 23 through the second one-way valve 32 for secondary pressurization, and the secondary pressurized gas is output through the output port through the third one-way valve 33.

[0038] By adopting the diverter component 2 for multi-stage boosting design, a single vacuum pump can achieve a higher vacuum degree, and it is no longer necessary to have multiple pumps working in parallel, which simplifies system design and control. Compared with multiple parallel pumps, a single multi-stage boosting pump occupies less space, simplifies the equipment, and reduces the difficulty and cost of installation and maintenance. By forming a two-stage pressurization through the diverter channel and multi-stage boosting, it is possible to optimize energy utilization while improving the vacuum degree, avoiding the high energy consumption problem caused by simply increasing the power.

[0039] At the same time, the multi-stage pressurization design can evenly distribute the burden of each stage of pressurization, avoid the problem of excessive heat caused by increasing high power in a single stage, effectively reduce heat accumulation, reduce the heat dissipation requirements of the pump, and extend the service life of the pump.

[0040] The main pump body 1 inhales gas through the airflow input port 13, and the gas enters the flow divider assembly 2 provided with a primary flow divider 22 and a secondary flow divider 23. First, the gas passes through the primary flow divider 22 and is pressurized for the first time at the first one-way valve 31 on the pressure plate 3. The first one-way valve 31 ensures the one-way flow of the gas, and cooperates with the reinforcing strip 41 to strengthen the pressure. The gas after the first pressurization is introduced into the secondary flow divider 23, passes through the second one-way valve 32 on the pressure plate 3, enters the secondary flow divider 23, and is pressurized again. The gas after the second pressurization passes through the third one-way valve 33 on the pressure plate 3, and is finally discharged through the output port.

[0041] To facilitate the extraction of airflow from the vacuum chamber, the main pump body 1 includes an outer shell 12 fixedly mounted on one side of the output end of the main pump body 1, and the airflow input port 13 is arranged on one side of the outer shell 12, and is connected to the vacuum chamber inside the vacuum sealing machine through the airflow input port 13.

[0042] In order to extract air flow from the vacuum chamber, the main pump body 1 also includes a micro motor 11, an eccentric wheel 14 inserted in the output end of the micro motor 11, and an air pumping plate 15 inserted in the eccentric groove of the eccentric wheel 14. The air pumping plate 15 is provided with a plurality of air pumping columns 16, which are matched with the through holes 211, and when the air pumping columns 16 move to the end, they abut against the bottom of the rubber sleeve 212.

[0043] The airflow in the vacuum chamber enters the main pump body 1 through the airflow input port 13 on one side of the outer shell 12. The input port is connected to the vacuum chamber inside the vacuum sealer through a pipeline to ensure that the airflow enters the pump body smoothly.

[0044] Through the micro motor 11, the rotating shaft of the output end of the motor is plugged into an eccentric wheel 14. The eccentric groove on the eccentric wheel 14 is equipped with an air pumping plate 15, and the air pumping plate 15 is provided with a plurality of air pumping columns 16.

[0045] When the motor is running, it drives the eccentric wheel 14 to rotate, and the eccentric wheel 14 drives the pumping plate 15 to reciprocate through the internal inclined eccentric groove. The movement of the pumping plate 15 pushes the airflow into the primary and secondary flow channels through the pumping column 16. As the airflow is pushed in, negative pressure is generated on the other side, and the gas inside the vacuum chamber is extracted from the airflow input port 13 through the negative pressure.

[0046] In order to enable the air pumping column 16 to push the gas into the branch channel during the reciprocating stroke, an arc-shaped through hole 213 is opened at the bottom edge of the rubber sleeve 212, and a vent hole 161 is opened at the center of the end of the air pumping column 16. The vent hole 161 and the arc-shaped through hole 213 are staggered.

[0047] When the inflating column 16 moves to the end, the other end of the inflating column 16 will abut against the bottom of the rubber sleeve 212, and the air vent 161 and the arc-shaped through hole 213 are staggered to continuously push the airflow during the reciprocating process of the inflating column 16.

[0048] By integrating the micro motor 11, eccentric wheel 14 and pumping plate 15 and other components inside the main pump body 1, the function of efficiently extracting airflow from the vacuum chamber is realized. The compact structure is easy to install and maintain, suitable for environments with limited space, and more energy-saving than traditional designs, optimizing energy utilization. The design of multiple pumping columns 16 enhances the extraction efficiency, ensures the stability and durability of the system, and thus extends the service life of the equipment.

[0049] In this embodiment, there are four pumping columns 16, all of which are arranged on the pumping plate 15 through integrated molding, and a protruding guide rod is arranged in the middle of one end of the pumping plate 15 away from the pumping column 16, and the guide rod is inserted into the eccentric groove. The pumping plate 15 and the pumping column 16 are driven to move through the cooperation of the guide rod and the eccentric groove.

[0050] In order to strengthen the internal sealing strength and prevent air leakage, and to ensure that the airflow enters the pressurized state inside the secondary shunt channel 23 through the second one-way valve 32, the shunt assembly 2 includes an auxiliary shell 21 arranged on the side of the outer shell 12 away from the main pump body 1, and a plurality of through holes 211 are arranged in the auxiliary shell 21, and rubber sleeves 212 are inserted in the through holes 211. The plurality of rubber sleeves 212 are connected by rubber strips 214, and the plurality of rubber sleeves 212 are embedded above the auxiliary shell 21 through the rubber strips 214. The rubber sleeves 212 inserted into different through holes 211 respectively form the primary shunt channel 22 and the secondary shunt channel 23. A sealing ring 24 is embedded between the auxiliary shell 21 and the outer shell 12.

[0051] An auxiliary shell 21 is provided at the far end of the outer shell 12 and the main pump body 1 to strengthen the internal sealing strength and prevent air leakage. At the same time, the flow splitter assembly 2 ensures that the airflow can effectively pass through the second one-way valve 32 to enter the secondary flow splitter 23 to maintain the pressurized state. The sealing ring 24 is embedded between the auxiliary shell 21 and the outer shell 12 to further strengthen the sealing effect of the entire system and effectively prevent air leakage.

[0052] Multiple rubber sleeves 212 are connected by rubber strips 214 to form a compact integrated structure. At the same time, the precise matching of the rubber sleeves 212 and the through holes 211 ensures the independence of the primary and secondary flow channels 23, avoids airflow mixing, and ensures the stability and reliability of the system.

[0053] After the airflow enters the outer shell 12, it first passes through the primary branch channel 22 and the secondary branch channel 23, and then enters the main pump body 1 through the first one-way valve 31 for preliminary air extraction and pressurization.

[0054] Then the airflow passes through the second one-way valve 32 and enters the secondary branch channel 23 inside the auxiliary shell 21 to be further mixed and pressurized with the gas that first enters the secondary branch channel 23, and then is discharged together through the third one-way valve 33.

[0055] The first one-way valve 31 controls the airflow to be output from bottom to top, the second one-way valve 32 controls the airflow to be output from top to bottom, and the third one-way valve 33 controls the airflow to be output from bottom to top.

[0056] In order to optimize the airflow control and sealing performance, the system is ensured to be efficient and stable through precision design and integrated molding process. Three one-way valves with different directions (first one-way valve 31, second one-way valve 32, third one-way valve 33) are used to control the flow direction of the airflow.

[0057] The one-way valve structure includes an arc-shaped rubber sheet, which is designed to be arc-shaped to ensure that it can flexibly cover and seal the vent hole 161. The bottom of the arc-shaped rubber sheet can completely cover the vent hole 161, and maintain a sealed state when no airflow passes through.

[0058] The connecting rod is installed on the side of the rubber sheet facing the vent hole 161 to play a supporting and guiding role. The connecting rod ensures that the rubber sheet can accurately open and close the vent hole 161 under different air flow pressures.

[0059] The connecting rod passes through the pressure sheet 3, and the restraint block located on the other side of the pressure sheet 3 is clamped on the pressure sheet 3 to restrain and fix the rubber sheet. The restraint block can ensure that the rubber sheet can be properly opened when the airflow passes through, and at the same time provide sufficient resistance when the airflow is reversed to ensure the sealing effect.

[0060] The restraint block, connecting rod and rubber sheet are all made of high-quality rubber to ensure durability and sealing performance. The integrated molding process ensures a close fit between the components, reducing potential obstacles and air leakage points.

[0061] First one-way valve 31 (airflow output from bottom to top): When the airflow is from bottom to top, the rubber sheet is pushed open by the airflow pressure below the rubber sheet to allow the airflow to pass through. When the airflow stops or reverses, the rubber sheet quickly covers the airflow hole 161 under the action of the connecting rod and the constraint block to prevent the reverse airflow and ensure the one-way output of the airflow.

[0062] Second one-way valve 32 (airflow output from top to bottom): When the airflow is from top to bottom, the rubber sheet is pushed open by the airflow pressure from above, allowing the airflow to pass through. When the airflow stops or reverses, the rubber sheet presses the airflow hole 161, preventing the airflow from passing through, thereby achieving one-way control.

[0063] The third one-way valve 33 (airflow output from bottom to top): the working principle is the same as the first one-way valve 31, which is specifically used to control the airflow output from bottom to top to ensure that each section of airflow in the system can flow in a preset direction.

[0064] The arc-shaped rubber sheet and integrated molding process ensure the tightness and sensitivity of each one-way valve when opening and closing. High-quality rubber materials and integrated molding process provide higher durability and reliability. The design of three one-way valves in different directions makes the airflow direction control more precise, thus achieving two-stage supercharging.

[0065] In order to keep the various components tightly connected, a number of bolts 5 are included. The bolts 5 penetrate the cover 4, the pressure plate 3, and the auxiliary shell 21, and are threadedly fixed on the outer shell 12.

[0066] The stability and tightness between the components are ensured by adding the bolts 5. The cover 4, the pressure plate 3, the auxiliary shell 21 and other components are fixed to the outer shell 12 by the bolts 5, which can effectively improve the structural stability and pressure resistance of the entire system.

[0067] The cover 4 is tightly fixed to the outer shell 12 by bolts 5, providing a sealed environment for the entire system. The pressure plate 3 is tightly attached between the cover 4 and the auxiliary shell 21 and fixed by bolts 5 to achieve a firm connection, ensuring that the airflow is fully pressurized when passing through the one-way valve. The auxiliary shell 21 is connected to the outer shell 12 by bolts 5 to ensure its stability.

[0068] The fixing with bolt 5 enhances the overall rigidity and pressure resistance of the structure and ensures the stable connection of the components under high pressure environment.

[0069] Several bolts 5 sequentially penetrate the cover 4, the pressure plate 3 and the auxiliary shell 21, and are finally threadedly fixed on the outer shell 12. During the installation process, it is necessary to ensure that each bolt 5 is fully tightened to ensure the tight connection of each component.

[0070] In actual use, the bolt 5 maintains the tight connection between the various components through its high-strength material properties, thereby preventing the components from loosening due to vibration or pressure changes.

[0071] During operation, the working pressure generated by the entire system is distributed to various components through the bolts 5. The tightening force of the bolts 5 helps to disperse the pressure and prevent a single component from being subjected to excessive stress.

[0072] It should be noted that the equipment structure and drawings of the present invention mainly describe the principle of the present invention. In terms of the technology of the design principle, the standard parts used can be purchased from the market and can be customized according to the instructions and drawings. The specific connection methods of each part adopt mature conventional means such as bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the components known to technical personnel in this field, their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0073] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A vacuum pump, characterized in that: include: A main pump body (1), wherein one side of the output end of the main pump body (1) is provided with an air flow input port (13); A flow splitter assembly (2) disposed on one side of the output end of the main pump body (1), wherein the input end of the flow splitter assembly (2) is in communication with the airflow input port (13), and the flow splitter assembly (2) comprises a primary flow splitter channel (22) and a secondary flow splitter channel (23); A pressure plate (3) is arranged on one side of the output end of the flow dividing component (2), a first one-way valve (31) is arranged on the pressure plate (3) and is connected to the primary flow dividing channel (22), a second one-way valve (32) is arranged on the pressure plate (3) and is connected to the secondary flow dividing channel (23), and a third one-way valve (33) is arranged on the pressure plate (3) and is connected to the secondary flow dividing channel (23); a sealing cover (4) covering the pressure plate (3), the sealing cover (4) being provided with a reinforcing strip (41) surrounding the first one-way valve (31) and the second one-way valve (32), and the sealing cover (4) being provided with an output pipe (42) communicating with the third one-way valve (33); The first one-way valve (31) cooperates with the reinforcing strip (41) to perform a primary pressurization, the primary pressurized gas is introduced into the secondary branch channel (23) through the second one-way valve (32) for a secondary pressurization, and the secondary pressurized gas is output through the output port through the third one-way valve (33).

2. A vacuum pump according to claim 1, characterized in that: The main pump body (1) comprises an outer shell (12) fixedly mounted on one side of the output end of the main pump body (1), and the airflow input port (13) is arranged on one side of the outer shell (12) and is connected to the vacuum chamber inside the vacuum sealing machine through the airflow input port (13).

3. A vacuum pump according to claim 2, characterized in that: The flow diversion component (2) comprises an auxiliary shell (21) arranged on a side of the outer shell (12) away from the main pump body (1), the auxiliary shell (21) is provided with a plurality of through holes (211), a rubber sleeve (212) is inserted into the through hole (211), a plurality of the rubber sleeves (212) are connected by a rubber strip (214), a plurality of the rubber sleeves (212) are embedded above the auxiliary shell (21) by the rubber strip (214), and the rubber sleeves (212) inserted into different through holes (211) respectively form a primary flow diversion channel (22) and a secondary flow diversion channel (23).

4. A vacuum pump according to claim 3, characterized in that: A sealing ring (24) is embedded between the auxiliary shell (21) and the outer shell (12).

5. A vacuum pump according to claim 1, characterized in that: The main pump body (1) further comprises a micro motor (11), an eccentric wheel (14) inserted into the output end of the micro motor (11), and an air pumping plate (15) inserted into the eccentric groove of the eccentric wheel (14); the air pumping plate (15) is provided with a plurality of air pumping columns (16); the air pumping columns (16) match the through holes (211), and the air pumping columns (16) abut against the bottom of the rubber sleeve (212) when they move to the end.

6. A vacuum pump according to claim 5, characterized in that: An arc-shaped through hole (213) is provided at the bottom edge of the rubber sleeve (212), and an air vent (161) is provided at the center of the end of the air pumping column (16). The air vent (161) and the arc-shaped through hole (213) are arranged in a staggered manner.

7. A vacuum pump according to claim 1, characterized in that: The first one-way valve (31) controls the airflow to be output from bottom to top, the second one-way valve (32) controls the airflow to be output from top to bottom, and the third one-way valve (33) controls the airflow to be output from bottom to top.

8. A vacuum pump according to claim 1, characterized in that: It also includes a plurality of bolts (5), which penetrate the sealing cover (4), the pressure plate (3), and the auxiliary shell (21), and the ends of the bolts (5) are threadedly fixed on the outer shell (12).

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