Multi-stage pressurizing vacuum pump

Abstract

The utility model provides a multi-stage pressurizing vacuum pump which comprises a main pump body, a flow dividing assembly, a pressurizing assembly and a sealing cover. The first side of the flow dividing assembly is arranged at the output end of the main pump body, the second side of the flow dividing assembly is used for being connected with the pressurizing assembly, and the sealing cover is arranged on the pressurizing assembly. Wherein an input pipe and an output pipe are formed on the side, away from the pressurizing assembly, of the sealing cover, reinforcing ribs are formed on the side, close to the pressurizing assembly, of the sealing cover, the reinforcing ribs can form an air inlet cavity, an air outlet cavity and a plurality of pressurizing cavities when the sealing cover is fixed to the pressurizing assembly, the air inlet cavity communicates with the input pipe, and the air outlet cavity communicates with the output pipe; the pressurizing assembly communicates with the air inlet cavity, the air outlet cavity and the multiple pressurizing cavities when arranged on the flow dividing assembly; according to the utility model, the higher vacuum degree of a single vacuum pump is realized, the system design and control are simplified, the occupied space is smaller, and the difficulty and the cost of installation and maintenance are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of booster pump, in particular to a multistage booster vacuum pump. BACKGROUND

[0002] The negative pressure booster pump is a device for improving the vacuum degree in the vacuum system. It further reduces the pressure on the basis of the primary vacuum pump, thereby realizing higher vacuum degree. Using the negative pressure booster pump in the vacuum cavity of the vacuum sealing machine can effectively enhance the negative pressure, so that the sealing effect is better and the speed is faster.

[0003] The currently used negative pressure booster pump cannot extract the air in the vacuum bag at one time in the application of a single pump machine, therefore, multiple pump machines need to be used to realize the expected effect, and increasing the number of pump machines will lead to complex equipment structure, increased space occupied by the pump machines, increased volume of the sealing machine, and coordinated control responsibility of multiple pump machines. UTILITY MODEL CONTENTS

[0004] The utility model provides a multistage booster vacuum pump can effectively solve above -mentioned problem.

[0005] The utility model is realized as follows:

[0006] The utility model provides a multistage booster vacuum pump, comprising: main pump body, shunt subassembly, pressurization subassembly and cover.

[0007] The first side of the shunt subassembly is arranged on the output end of the main pump body, the second side of the shunt subassembly is used for connecting the pressurization subassembly, and the cover is arranged on the pressurization subassembly.

[0008] Wherein, the side of the cover away from the pressurization subassembly forms an input pipe and an output pipe, the side of the cover close to the pressurization subassembly forms a reinforcing rib, the reinforcing rib can form an air inlet cavity, an air outlet cavity and multiple pressurization cavities when the cover is fixed on the pressurization subassembly, the air inlet cavity is communicated with the input pipe, and the air outlet cavity is communicated with the output pipe.

[0009] The pressurization subassembly is communicated with the air inlet cavity, the air outlet cavity and multiple pressurization cavities when being arranged on the shunt subassembly.

[0010] The input pipe is communicated with the vacuum cavity of the vacuum sealing machine to extract the gas in the vacuum bag into the main pump body, and the output pipe can be communicated with the gas after multiple pressurizations to the exhaust port of the vacuum sealing machine.

[0011] As a further improvement, the main pump body is provided with an embedding groove on the side close to the shunt subassembly, and the embedding groove is connected with a sealing ring.

[0012] As a further improvement, the main pump body is connected with a motor on the side away from the shunt assembly, the output end of the motor is connected with an eccentric wheel, the eccentric wheel is sequentially connected with a shaft and a pumping assembly.

[0013] As a further improvement, the pumping assembly comprises a pumping plate and pumping columns, a plurality of large pumping columns are arranged on the pumping plate, and a ventilation hole is arranged at the center of the end of the pumping column.

[0014] As a further improvement, the shunt assembly comprises an auxiliary shell, a plurality of through holes are arranged in the auxiliary shell, a rubber sleeve is inserted into the auxiliary shell, the rubber sleeve is provided with a plurality of rubber sleeve columns matched with the through holes, a plurality of air holes are arranged at the center of the rubber sleeve, and an arc-shaped through hole is arranged at the center of the end of the rubber sleeve column.

[0015] As a further improvement, the pressurizing assembly is formed with a plurality of air outlets and air inlets.

[0016] As a further improvement, the pressurizing assembly comprises a pressurizing plate, a second one-way valve is connected to the air inlet on the side close to the shunt assembly, and a first one-way valve is connected to the air outlet on the side close to the cover.

[0017] As a further improvement, the cover is provided with a positioning block on the side close to the pressurizing assembly.

[0018] As a further improvement, a plurality of bolts are further included, the bolts penetrate the cover, the pressurizing assembly and the shunt assembly, and the ends of the bolts are threadedly fixed on the main pump body.

[0019] The utility model discloses beneficial effect is:

[0020] The utility model discloses a shunt assembly is designed to carry out multistage pressurization, and a single vacuum pump can realize higher vacuum degree, and it is no longer needed that multiple pump machines are connected in parallel and work, and the system design and control are simplified, and the space occupied by a single multistage pressurization pump machine is smaller than that of multiple parallel pump machines, and the equipment is simplified, and the difficulty and cost of installation and maintenance are reduced, a plurality of pressurizing cavities are arranged at the cover to form continuous multistage pressurization, and the pumping assembly is arranged to be driven by the eccentric wheel and realizes pressurization effect according to certain order, can improve the vacuum degree and optimize energy utilization, avoids the high energy consumption problem caused by simple power increase, and the input pipe and the output pipe are arranged on the same side, and the pipeline connection of the vacuum pump is facilitated. DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 is a perspective structural schematic view of a multi-stage booster vacuum pump of the present application.

[0023] Figure 2 is an exploded schematic view of the structure of a multi-stage booster vacuum pump of the present application.

[0024] Figure 3 is a bottom view schematic view of the cover structure of a multi-stage booster vacuum pump of the present application.

[0025] Figure 4 is a top view schematic view of the pressurizing sheet structure of a multi-stage booster vacuum pump of the present application.

[0026] Figure 5 is a bottom view schematic view of the pressurizing sheet structure of a multi-stage booster vacuum pump of the present application.

[0027] Figure 6 is a bottom view schematic view of the rubber sleeve structure of a multi-stage booster vacuum pump of the present application.

[0028] Figure 7 is a schematic view of the inflating assembly structure of a multi-stage booster vacuum pump of the present application.

[0029] Figure 8 is a partial exploded view and gas flow direction schematic view of a multi-stage booster vacuum pump of the present application.

[0030] Figure 9 is a cross-sectional view and gas flow direction schematic view of a multi-stage booster vacuum pump of the present application.

[0031] In the figure: 1-main pump body, 11-embedded groove, 12-sealing ring, 13- eccentric wheel, 14-shaft, 15-inflating plate, 16-inflating column, 161-vent hole, 2- flow distribution assembly, 21-assistant shell, 211-through hole, 22-rubber sleeve, 221-air hole, 222-rubber sleeve column, 223-arc-shaped through hole, 3-pressurizing assembly, 31-pressurizing plate, 311-gas outlet, 312-gas inlet, 32-first one-way valve, 33-second one-way valve, 4-cover, 41-input pipe, 42-output pipe, 43-stiffening rib, 44-positioning block, 45-gas inlet cavity, 46-gas outlet cavity, 47-pressurizing cavity, 5-motor, 6-bolt. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In the description of the present application, the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified.

[0034] Referring to Figures 1-9 A multi-stage booster vacuum pump, comprising: a main pump body 1, a shunt assembly 2, a pressurization assembly 3 and a cover 4;

[0035] The first side of the shunt assembly 2 is arranged on the output end of the main pump body 1, the second side of the shunt assembly 2 is used to connect the pressurization assembly 3, and the cover is arranged on the pressurization assembly 3;

[0036] Wherein, the side of the cover 4 away from the pressurization assembly 3 forms an input pipe 41 and an output pipe 42, and the side of the cover 4 close to the pressurization assembly 3 forms a reinforcing rib 43, the reinforcing rib 43 can form an air inlet cavity 45, an air outlet cavity 46 and a plurality of pressurization cavities 47 when the cover 4 is fixed on the pressurization assembly 3, the air inlet cavity 45 and the input pipe 41 are communicated, and the air outlet cavity 45 and the output pipe 42 are communicated;

[0037] The pressurization assembly 3 is communicated with the air inlet cavity 45, the air outlet cavity 46 and the plurality of pressurization cavities 47 when arranged on the shunt assembly 2;

[0038] The input pipe 41 communicates the vacuum cavity of the vacuum sealing machine to extract the gas in the vacuum bag into the main pump body 1, and the output pipe 42 can communicate the gas after multiple pressurizations to the exhaust port of the vacuum sealing machine for exhaust.

[0039] By adopting the multi-stage pressurization design of the shunt assembly 2, a single vacuum pump can achieve higher vacuum degree, and multiple pumps are no longer needed to work in parallel, simplifying system design and control. Compared with multiple parallel pumps, a single multi-stage pressurization pump occupies less space, simplifies the equipment, and reduces the difficulty and cost of installation and maintenance. Through the continuous multi-stage pressurization formed by the shunt assembly 2 and the pressurization assembly 3, the energy utilization can be optimized while improving the vacuum degree, avoiding the high energy consumption problem caused by simply increasing the power. At the same time, the multi-stage pressurization design can evenly distribute the burden of each stage of pressurization, avoiding the problem of excessive heat caused by increasing the power of a single stage, effectively reducing heat accumulation, reducing the heat dissipation requirement of the pump, and prolonging the service life of the pump.

[0040] The gas enters the intake cavity 45 through the input pipe 41, enters the shunt assembly 2 through the gas inlet hole on the pressurization plate 31, and enters the main pump body 1 through the gas hole 221. Under the cooperation of the eccentric wheel 13 and the inflating assembly, the gas enters the inflating column 16, passes through the rubber sleeve column 222 into the gas outlet 311 on the pressurization plate 31, and realizes the first pressurization at the first one-way valve 32. Then, the gas enters the pressurization cavity 47. The first one-way valve 32 ensures the one-way flow of the gas flow and cooperates with the reinforcing rib 43 to strengthen the pressure. The gas after the first pressurization enters the rubber sleeve column 222 through the gas inlet 312 and the second one-way valve 33 arranged at the gas inlet 312, and is again inflated into the gas outlet 311 of the pressurization plate 31 by the inflating assembly. The gas realizes the second pressurization by the first one-way valve 32 and enters the next pressurization cavity 47. The cycle continues until the gas is inflated into the gas outlet cavity 46 and discharged through the output pipe 42.

[0041] Further, in order to realize the extraction of gas from the vacuum cavity of the sealing machine, the output end of the main pump body 1 is connected with the shunt assembly 2, the side of the main pump body 1 away from the shunt assembly 2 is connected with the motor 5, the output end of the motor 5 is connected with the eccentric wheel 13, the eccentric wheel 13 is provided with an eccentric groove, the shaft 14 and the inflating assembly are sequentially inserted into the eccentric groove, the inflating assembly includes the inflating plate 15 and the inflating column 16, the inflating plate 15 is provided with a plurality of inflating columns 16, the inflating column 16 is matched with the through hole 211, and the end of the inflating column 16 abuts against the bottom of the rubber sleeve 22 when the inflating column 16 moves. The gas in the vacuum cavity of the sealing machine enters the main pump body 1 through the input pipe 41 on the cover 4, the motor 5, the rotating shaft at the output end of the motor 5 is inserted into an eccentric wheel 13, the eccentric wheel 13 is provided with an eccentric groove, and the inflating assembly is connected with the shaft 14.

[0042] When the motor 5 is running, the eccentric wheel 13 is driven to rotate, and the eccentric wheel 13 drives the inflating assembly to reciprocate through the eccentric groove. The inflating plate 15 is in an inclined state in the main pump body 1 through the eccentric groove, so that the plurality of inflating columns 16 arranged on the inflating plate 15 are not on the same horizontal plane, and the rubber sleeve column 222 on the rubber sleeve 22 is driven to move, so as to realize the pushing of the gas into the pressurizing assembly 3 and the generation of negative pressure, and the gas in the vacuum cavity is extracted from the input pipe 41 through the negative pressure.

[0043] Further, in order to push the gas into the pressurizing assembly 3 in the reciprocating stroke of the inflating column 16, since the arc-shaped through hole 223 is arranged at the rubber sleeve column 222 of the rubber sleeve 22, the air hole 161 is arranged at the center of the end of the inflating column 16, the air hole 161 is arranged in a staggered manner with the arc-shaped through hole 223, and when the inflating column 16 moves towards the cover 4, the other end of the inflating column 16 abuts against the bottom of the rubber sleeve 22. Through the staggered arrangement of the air hole 161 and the arc-shaped through hole 223, the inflating column 16 continuously pushes the airflow in the reciprocating movement process.

[0044] By integrating the motor 5, the eccentric wheel 13 and the inflating assembly and other elements in the main pump body 1, the function of efficiently extracting the gas from the vacuum cavity is realized, the structure is compact, the installation and maintenance are convenient, it is suitable for the environment with limited space, and compared with the traditional design, it is more energy-saving, the energy utilization is optimized, the design of the plurality of inflating columns 16 enhances the gas extraction efficiency, ensures the stability and durability of the system, thereby prolongs the service life of the equipment, and the main pump body 1 is provided with the embedding groove 11 on the side close to the shunt assembly 2, the embedding groove 11 is connected with the sealing ring 12, the air tightness of the vacuum pump is improved, and the gas leakage is prevented.

[0045] In the embodiment, the inflating column 16 is provided with four, which are arranged on the inflating plate 15 through integrated molding, and the shaft 14 is inserted at the center of the side of the inflating plate 15 away from the inflating column 16, the shaft 14 is inserted into the eccentric groove of the eccentric wheel 13, and the inflating plate 15 and the inflating column 16 are driven to move through the cooperation of the shaft 14 and the eccentric groove.

[0046] Further, in order to strengthen the internal sealing strength, prevent air leakage, and ensure that the gas enters the pressurized state in the rubber sleeve column 222 through the second one-way valve 33, the shunt assembly 2 includes an auxiliary shell 21 arranged on the side of the main pump body 1 away from the motor 5, a plurality of through holes 211 are arranged in the auxiliary shell 21, and a rubber sleeve 22 is inserted into the auxiliary shell 21. The rubber sleeve 22 is provided with a plurality of rubber sleeve columns 222 matched with the through holes 211, the rubber sleeve 22 is embedded above the auxiliary shell 21 through the rubber sleeve columns 222, the rubber sleeve columns 222 inserted into different through holes 211 form multiple-stage shunt channels, and a plurality of air holes 221 are arranged at the center position of the rubber sleeve 22. The auxiliary shell 21 is arranged to strengthen the internal sealing strength and prevent air leakage, and the shunt assembly 2 ensures that the airflow can effectively enter the rubber sleeve column 222 through the second one-way valve 33 to maintain the pressurized state. The rubber sleeve 22 is a compact integrated structure, and the precise matching of the rubber sleeve column 222 and the through hole 211 ensures the independence of each stage of the shunt channel, avoids airflow mixing, and guarantees the stability and reliability of the system.

[0047] Further, in order to optimize the sealing performance of the airflow control box, the shunt assembly 2 is connected with a pressurizing assembly 3 on the side close to the rubber sleeve 22. The pressurizing assembly 3 includes a pressurizing plate 31, a plurality of gas outlets 311 and gas inlets 312 are arranged on the pressurizing plate 31, a second one-way valve 33 is connected to the pressurizing plate 31 at the gas inlet 312 on the side close to the shunt assembly 2, a first one-way valve 32 is connected to the pressurizing plate 31 at the gas outlet 311 on the side close to the cover 4, and a plurality of circular through holes are arranged at the center position of the pressurizing plate 31. The circular through holes are used for communication with the input pipe 41, so that the gas can enter the main pump body 1. The first one-way valve 32 controls the output of the airflow from bottom to top, and the second one-way valve 33 controls the output of the airflow from top to bottom. The one-way valve structure includes a circular-arc-shaped rubber sheet. The rubber sheet is designed in a circular-arc shape to ensure that it can flexibly cover and seal the gas outlet 311 and the gas inlet 312. When there is gas passing through, the circular-arc-shaped rubber sheet is lifted by the airflow. When there is no airflow passing through, the sealing state is maintained. The rubber sheet is also provided with a connecting rod, which plays a supporting and guiding role. The connecting rod ensures that the rubber sheet can be accurately opened and closed under different airflow pressures. The rubber sheet and the connecting rod are made of high-quality rubber material to ensure their durability and sealing performance. An integrated molding process is adopted to ensure the close fit between the parts, reducing potential obstacles and air leakage points.

[0048] The first one-way valve 32 controls the output of the airflow from bottom to top. When the airflow flows from bottom to top, the rubber sheet is lifted by the airflow pressure below the gas outlet 311, realizing the passage of the gas. When the gas stops or flows in the opposite direction, the rubber sheet quickly covers the gas outlet 311 under the action of the connecting rod and its own weight, preventing the gas from flowing in the opposite direction, and ensuring the one-way output of the gas.

[0049] The second one-way valve 33 controls the gas flow from top to bottom. When the gas flows from top to bottom, the rubber sheet is pushed open by the pressure of the gas flow from above, allowing the gas to pass through. When the gas stops or flows in the opposite direction, the rubber sheet quickly covers the air inlet 312 under the action of the connecting rod, preventing the gas from flowing in the opposite direction, ensuring one-way output of the gas.

[0050] The circular arc rubber sheet and the integrated molding process ensure the sealing and sensitivity of each one-way valve when it is opened and closed. The high-quality rubber material and the integrated molding process provide higher durability and reliability. The design of two one-way valves in different directions makes the gas flow direction control more accurate, achieving continuous multi-stage pressurization.

[0051] Further, to achieve continuous multi-stage pressurization, the pressurizing assembly 3 is connected with a cover 4 away from the flow dividing assembly 2. The cover 4 is provided with an input pipe 41 and an output pipe 42 away from the pressurizing assembly 3. The cover 4 is provided with reinforcing ribs 43 near the pressurizing assembly 3. The cover 4 is divided into an air inlet cavity 45, an air outlet cavity 46, and a plurality of pressurizing cavities 47 by the reinforcing ribs 43. The air inlet cavity 45 is used to connect the input pipe 41 and the circular through hole on the pressurizing plate 31. The gas in the vacuum cavity is extracted and enters the vacuum cavity through the input pipe 41, then enters the main pump body 1 through the circular through hole and the air hole 221. The air outlet cavity 46 is used to discharge the gas after multiple pressurizations through the output pipe 42. The air outlet cavity 46 is connected with an air outlet 311 and the output pipe 42. The gas is discharged to the air outlet cavity 46 through the air outlet 311, and then flows to the output pipe 42. The pressurizing cavity 47 is used to connect an air outlet 311 and an air inlet 312. The gas flows from the air outlet 311 to the pressurizing cavity 47 after being pressurized, and then enters the rubber sleeve column 221 through the air inlet 312, and is sent to the next pressurizing cavity 47 through the inflating column 16, until the gas is delivered to the air outlet cavity 46. The cover 4 is provided with a positioning block 44 near the pressurizing assembly 3. The pressurizing plate 31 is provided with a matching positioning groove at the position corresponding to the positioning block 44. The correct installation of the pressurizing plate 31 and the cover 4 is realized by the cooperation of the positioning block 44 and the positioning groove, so that the gas moves in the correct flow direction.

[0052] Further, in order to keep the close connection state of each component, a plurality of bolts 6 are further included, the bolts 6 penetrate the cover 4, the pressing plate 31 and the auxiliary shell 21, and are threadedly fixed on the main pump body 1, by increasing the use of the bolts 6, the stability and fastening between each component are ensured, the structural stability and pressure resistance of the whole system can be effectively improved, the cover 4 is tightly fixed on the main pump body 1 through the bolts 6, and a sealed environment is provided for the whole system. The pressurizing assembly 3 is fixed through the bolts 6 by being closely attached between the cover 4 and the auxiliary shell 21, sufficient pressurization of airflow is ensured when passing through the one-way valve, the fixing of the bolts 6 enhances the overall rigidity and pressure resistance of the structure, and stable connection of each component under high pressure environment is ensured, the bolts 6 keep the close connection of each component through the high-strength material characteristics, and loosening of the components caused by vibration or pressure change is avoided.

[0053] The preferred embodiments of the utility model are described above only, and are not used for limiting the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A multi-stage booster vacuum pump, characterized by, The utility model relates to a kind of multi-stage vacuum pump, including: Main pump body (1), shunt component (2), pressurization component (3) and cover (4); The first side of the shunt component (2) is configured on the output end of the main pump body (1), and the second side of the shunt component (2) is used to connect the pressurization component (3), and the cover is configured on the pressurization component (3); Wherein, the side of the cover (4) away from the pressurization component (3) forms input pipe (41) and output pipe (42), the side of the cover (4) close to the pressurization component (3) forms reinforcing rib (43), the reinforcing rib (43) can form air inlet cavity (45), air outlet cavity (46) and multiple pressurization cavities (47) when the cover (4) is fixed on the pressurization component (3), the air inlet cavity (45) and the input pipe (41) are communicated, the air outlet cavity (46) and the output pipe (42) are communicated; The pressurization component (3) is communicated with the air inlet cavity (45), the air outlet cavity (46) and multiple pressurization cavities (47) when being configured on the shunt component (2); The input pipe (41) communicates the vacuum cavity of vacuum sealing machine to extract the gas in vacuum bag into the main pump body (1), and the output pipe (42) can be communicated to the exhaust port of vacuum sealing machine after multiple pressurizations to discharge.

2. A multi-stage booster vacuum pump according to claim 1, characterized in that The main pump body (1) is provided with an embedded groove (11) on the side close to the shunt component (2), and the embedded groove (11) is connected with a sealing ring (12).

3. A multi-stage booster vacuum pump according to claim 1, characterized in that The main pump body (1) is connected with a motor (5) on the side away from the shunt component (2), the output end of the motor (5) is connected with an eccentric wheel (13), and the eccentric wheel (13) is sequentially connected with a shaft (14) and a pumping component.

4. A multi-stage booster vacuum pump according to claim 3, characterized in that The pumping component includes a pumping plate (15) and a pumping column (16), a plurality of large pumping columns (16) are provided on the pumping plate (15), and a ventilation hole (161) is formed at the center of the end of the pumping column (16).

5. A multi-stage booster vacuum pump according to claim 1, characterized in that, The shunt component (2) includes an auxiliary shell (21), a plurality of through holes (211) are arranged in the auxiliary shell (21), a rubber sleeve (22) is inserted into the auxiliary shell (21), the rubber sleeve (22) is provided with a plurality of rubber sleeve columns (222) matched with the through holes (211), a plurality of air holes (221) are formed at the center of the rubber sleeve (22), and an arc-shaped through hole (223) is formed at the center of the end of the rubber sleeve column (222).

6. A multi-stage booster vacuum pump according to claim 1, characterized in that The pressurization component (3) forms a plurality of air outlets (311) and air inlets (312).

7. A multi-stage booster vacuum pump according to claim 6, characterized in that The pressurization component (3) includes a pressurization plate (31), a second one-way valve (33) is connected to the air inlet (312) on the side close to the shunt component (2) of the pressurization plate (31), and a first one-way valve (32) is connected to the air outlet (311) on the side close to the cover (4) of the pressurization plate (31).

8. A multi-stage booster vacuum pump according to claim 1, characterized in that The cover (4) is provided with a positioning block (44) on the side close to the pressurization component (3).

9. A multi-stage booster vacuum pump according to claim 1, characterized in that, Also included are a plurality of bolts (6) which pass through the cover (4), the pressurizing assembly (3), the flow dividing assembly (2), and the ends of which are threadedly fixed to the main pump body (1).

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