A Roots-type high-pressure booster with oil mist separation function

Abstract

The present invention relates to a Roots-type high-pressure supercharger with an oil mist separation function, which forms a first sealed cavity on the driving side and a second sealed cavity on the non-driving side. The feed pipe, the first sealed cavity and the second sealed cavity are connected through an air pressure balancing component. The pressure increase generated by the temperature rise of the oil tank is released to the inlet of the supercharger through the air pressure balancing component, so that the difference between the internal pressure of the oil tank and the exhaust pressure of the supercharger is not greater than the inlet and outlet pressure difference of the supercharger. After balancing the internal pressure difference, the device has very good sealing reliability and service life, and is suitable for use under high-pressure working conditions. In addition, the Roots-type high-pressure supercharger does not need to be completely enclosed in a pressure vessel to ensure a good internal and external pressure difference, which is convenient for inspection and maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of supercharging equipment, and in particular to a Roots-type high-pressure supercharger with an oil mist separation function. Background Art

[0002] In hydrogen, natural gas, or compressed air adsorption drying systems, to ensure optimal drying performance and zero gas consumption, finished dry gas is typically used for adsorbent regeneration. This reduced gas pressure requires boosting before it can be returned to the system, otherwise significant waste occurs. This necessitates the use of low-flow, high-pressure boosting equipment. Because the medium's high pressure creates stringent gas sealing requirements, coupled with low flow rates and minimal boost pressure (less than 1 bar), Roots-type high-pressure boosters are ideally suited to these operating conditions.

[0003] Due to the high cost of high-pressure Roots superchargers, some companies are currently placing ordinary Roots superchargers as a whole inside a high-pressure pressure vessel. This allows the Roots supercharger to obtain a working environment similar to that under normal atmospheric pressure, without the need for additional high-pressure-resistant design. However, this solution has significant technical flaws. The oil mist generated by the supercharger's lubrication system and the target gas form a stable aerosol in a high-pressure, closed environment. The lack of an efficient gas-liquid separation mechanism leads to mixed contamination of the lubricating oil phase and the gas phase medium. In addition, the high-pressure environment can intensify the wall deposition of oil mist particles, causing carbonization and consolidation of the oil, which not only reduces the adsorbent regeneration efficiency but also causes abnormal wear of the equipment. In addition, this solution encapsulates the entire supercharger in the pressure vessel, requiring the entire system to be depressurized during troubleshooting, making it difficult to achieve rapid isolation and targeted maintenance of key components. Summary of the Invention

[0004] Based on the above description, the present invention provides a Roots-type high-pressure supercharger with an oil mist separation function to solve the technical problem in the prior art that the supercharger is placed inside a pressure vessel, causing inconvenience in maintenance.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A Roots-type high-pressure supercharger with an oil mist separation function, comprising a pump body, a magnetic coupling, a rotor assembly, a synchronous transmission assembly, an oil tank, and an air pressure balance assembly;

[0007] A boosting chamber is formed inside the pump body, and a feed pipe and a discharge pipe are respectively provided at both ends of the boosting chamber. The pump body has a driving side and a non-driving side opposite to each other;

[0008] The rotor assembly includes a driving rotor and a driven rotor, both of which are rotatably disposed on the pump body, the front end of the driving rotor extending from the driving side and the rear end extending from the non-driving side; the rear end of the driven rotor extending from the non-driving side;

[0009] The magnetic coupling is installed at the front end of the driving rotor, and the synchronous transmission assembly is installed at the rear end of the rotor assembly, for synchronous rotation of the driving rotor and the driven rotor;

[0010] In which, the magnetic coupling and the pump body form a first sealed cavity, and the front end of the driving rotor is built into the first sealed cavity; the oil tank is arranged on the non-driving side of the pump body, and the oil tank and the pump body form a second sealed cavity, and the synchronous transmission assembly is built into the second sealed cavity, and the air pressure balance assembly connects the feed pipe, the first sealed cavity and the second sealed cavity.

[0011] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0012] The Roots-type high-pressure supercharger provided by the present invention forms a first sealed cavity with the pump body through a magnetic coupling, and a second sealed cavity containing a synchronous transmission assembly is provided on the non-drive side. Combined with the oil mist filter connection design of the air pressure balance assembly, the following technical effects are achieved:

[0013] 1) Through double-seal cavity isolation and directional filtration of the air pressure balance component, lubricating oil mist and conveying medium are effectively separated to avoid adsorbent contamination;

[0014] 2) The independent cavity structure of the magnetic coupling and synchronous transmission assembly supports zoned pressure relief maintenance to ensure continuous operation of the system;

[0015] 3) The air pressure balance component dynamically adjusts the pressure of the sealing cavity, reduces the high-pressure sealing load, and extends the life of the equipment.

[0016] Under high-pressure conditions, the device takes into account both the medium purification needs and the economic efficiency of operation and maintenance.

[0017] On the basis of the above technical solution, the present invention can also be improved as follows.

[0018] Furthermore, the synchronous transmission assembly includes a driving gear and a driven gear, the driving gear is installed at the rear end of the driving rotor; the driven gear is installed at the rear end of the driven rotor, the driving gear and the driven gear are meshed and transmitted with a transmission ratio of 1.

[0019] Furthermore, the pump body includes a driving side wall plate, a pump casing and a non-driving side wall plate. Both sides of the pump casing are open. The driving side wall plate and the non-driving side wall plate are respectively sealed and installed on both sides of the pump casing to form a boosting chamber.

[0020] Furthermore, the magnetic coupling includes an active terminal, a sealing cover and a passive terminal, the passive terminal is connected to the front end of the driving rotor, the sealing cover is installed on the outside of the passive terminal and forms a seal with the driving side wall panel, the active terminal is rotatably arranged on the outside of the sealing cover, and the active terminal and the passive terminal are transmitted through magnetic force.

[0021] Furthermore, a coupling shield is provided on the outer side of the magnetic coupling, and the coupling shield is provided on the driving side wall plate.

[0022] Furthermore, the air pressure balancing assembly includes a pressure balancing pipe, the front end of which is connected to the first sealed cavity and the feed pipe through a first pipeline, and the rear end of which is connected to the second sealed cavity through a second pipeline, and a pressure gauge is provided on the second pipeline; an oil mist filtering structure is provided inside the pressure balancing pipe.

[0023] Furthermore, two driving side bearing holes are formed on the driving side wall plate, and the front ends of the driving rotor and the driven rotor are respectively connected to the bearings in the two driving side bearing holes, and the driving side bearing holes are isolated from the boost chamber.

[0024] Furthermore, two non-drive side bearing holes are formed on the non-drive side wall panel, and the rear ends of the drive rotor and the driven rotor are correspondingly connected to the bearings arranged in the two non-drive side bearing holes, and the non-drive side bearing holes are isolated from the boost chamber.

[0025] Furthermore, the driving side bearing hole and the non-driving side bearing hole are sealed to the corresponding rotors through piston ring seals and oil seals.

[0026] Furthermore, the piston ring seal includes a piston ring and a ring support frame, the ring support frame is fixed on the corresponding rotor shaft and rotates with the shaft, and the piston ring is floatingly sleeved on the corresponding rotor shaft.

[0027] Furthermore, the oil seal is arranged between the piston ring seal and the bearing.

[0028] Furthermore, an oil collecting hole is formed at the lower end of the non-driving side wall panel, and the oil collecting hole is arranged corresponding to the two non-driving side bearing holes and is located between the piston ring seal and the oil seal. The Roots-type high-pressure supercharger also includes a sealing inspection component, and the sealing inspection component includes a conduit and an oil sight glass. The conduit connects the oil collecting hole and the oil sight glass.

[0029] Furthermore, a heat dissipation component for dissipating heat from the oil tank is provided on a side of the oil tank away from the pump body.

[0030] Furthermore, the heat dissipation assembly includes a fan and an outer cover, the outer cover is installed on the outside of the oil tank, and the fan is arranged on the outer cover.

[0031] Furthermore, heat dissipation fins are formed on the outer side wall of the oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the three-dimensional structure of a Roots-type high-pressure supercharger provided in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure from another perspective;

[0034] Figure 3 A rear view of a Roots-type high-pressure supercharger provided in an embodiment of the present invention;

[0035] Figure 4 for Figure 3 Schematic diagram of the mid-DD section;

[0036] Figure 5 for Figure 3 Schematic diagram of the EE section;

[0037] Figure 6 for Figure 3 Schematic diagram of the FF section;

[0038] Figure 7 Schematic diagram of the three-dimensional structure of the fuel tank in the embodiment of this application DETAILED DESCRIPTION

[0039] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0041] It will be understood that spatial relational terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be understood that in addition to the orientations shown in the figures, spatial relational terms also include different orientations of the device in use and operation. For example, if the device in the drawings is turned over, the element or feature described as "under the other elements" or "under it" or "below it" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include alternative orientations (e.g., rotated 90° or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0042] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection" should be understood as "electrical connection", "communication connection", etc., if the connected circuits, modules, units, etc. can transmit electrical signals or data to each other.

[0043] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0044] like Figures 1-6 As shown, the present application provides a Roots-type high-pressure supercharger with an oil mist separation function, which includes a pump body 10, a magnetic coupling 20, a rotor assembly 30, a synchronous transmission assembly 40, an oil tank 50 and an air pressure balance assembly 60.

[0045] A pressurizing chamber 10 a is formed inside the pump body 10 , and a feed pipe 110 and a discharge pipe 120 are respectively provided at both ends of the pressurizing chamber 10 a . The pump body 10 has a driving side 101 and a non-driving side 102 opposite to each other.

[0046] The rotor assembly 30 includes a driving rotor 31 and a driven rotor 32. Both the driving rotor 31 and the driven rotor 32 are rotatably arranged on the pump body 10. The front end of the driving rotor 31 extends from the driving side 101 and the rear end extends from the non-driving side 102; the rear end of the driven rotor 32 extends from the non-driving side 102.

[0047] The magnetic coupling 20 is mounted on the front end of the driving rotor 31 , and the synchronous transmission assembly 40 is mounted on the rear end of the rotor assembly 30 , for driving the rotor 31 and the driven rotor 32 to rotate synchronously.

[0048] Among them, the magnetic coupling 20 and the pump body 10 form a first sealed cavity A, and the front end of the driving rotor 31 is built into the first sealed cavity A; the oil tank 50 is arranged on the non-driving side 102 of the pump body 10, and the oil tank 50 and the pump body 10 form a second sealed cavity B, and the synchronous transmission assembly 40 is built into the second sealed cavity B, and the air pressure balance assembly 60 connects the feed pipe 110, the first sealed cavity A and the second sealed cavity B.

[0049] The Roots-type high-pressure supercharger provided in the present application forms a first sealed cavity A on the driving side 101 and a second sealed cavity B on the non-driving side 102. The feed pipe 110, the first sealed cavity A and the second sealed cavity B are connected through the air pressure balancing component 60, so that the pressure increase generated by the temperature rise of the oil tank 50 is released to the inlet of the supercharger through the air pressure balancing component 60, so that the difference between the internal pressure of the oil tank 50 and the exhaust pressure of the supercharger is not greater than the inlet and outlet pressure difference of the supercharger. After balancing the internal pressure difference, the device has very good reliability and life of the seal, and is suitable for use under high-pressure conditions. Moreover, the Roots-type high-pressure supercharger does not need to be completely enclosed inside the pressure vessel to ensure a good internal and external pressure difference, which is convenient for inspection and maintenance.

[0050] In an embodiment of the present application, the synchronous transmission assembly 40 includes a driving gear 41 and a driven gear 42. The driving gear 41 is installed at the rear end of the driving rotor 31; the driven gear 42 is installed at the rear end of the driven rotor 32. The driving gear 41 and the driven gear 42 are engaged for transmission and the transmission ratio is 1.

[0051] Specifically, the pump body 10 includes a driving side wall panel 11, a pump casing 12 and a non-driving side wall panel 13. The two sides of the pump casing 12 are open. The driving side wall panel 11 and the non-driving side wall panel 13 are respectively sealed and installed on both sides of the pump casing 12 to form a boost chamber 10a, wherein the driving side wall panel 11 and the non-driving side wall panel 13 are tightened and fixed with tensioning bolts.

[0052] It is understandable that the driving rotor 31 and the driven rotor 32 are formed with a Roots impeller structure at positions corresponding to the pump housing 12, and the extrusion and supercharging inside the supercharging chamber 10a are achieved through the rotation of the Roots impeller structure of the driving rotor 31 and the driven rotor 32.

[0053] In a preferred embodiment of the present application, the magnetic coupling 20 includes an active terminal 21, a sealing cover 22 and a passive terminal 23. The passive terminal 23 is connected to the front end of the driving rotor 31. The sealing cover 22 is installed on the outside of the passive terminal 23 and forms a seal with the driving side wall panel 11. The active terminal 21 is rotatably arranged on the outside of the sealing cover 22. The active terminal 21 and the passive terminal 23 are transmitted through magnetic force.

[0054] A seal is formed between the sealing cover 22 and the driving side wall panel 11, and the rotation of the passive terminal 23 is driven by the magnetic influence of the active terminal 21, so that the external driving mechanism and the working part of the supercharger are completely separated, ensuring that the working part of the supercharger is not affected by changes in the external ambient air pressure.

[0055] Preferably, a coupling shield 14 is provided on the outer side of the magnetic coupling 20 , and the coupling shield 14 is provided on the driving side wall plate 11 .

[0056] In an embodiment of the present application, the air pressure balancing assembly 60 includes a pressure balancing tube 61, the front end of the pressure balancing tube 61 is connected to the first sealed cavity A and the feed pipe 110 through a first pipeline 62, and the rear end of the pressure balancing tube 61 is connected to the second sealed cavity B through a second pipeline 63, and a pressure gauge 64 is provided on the second pipeline 63.

[0057] When the supercharger is working, the driving gear 41 and the driven gear 42 inside the oil tank 50 rotate at high speed to generate high temperature, causing the air pressure inside the second sealed chamber B to rise sharply, the gas to expand, and the air flow enters the first sealed chamber A through the pressure balance pipe 61, so that the pressure at the front and rear ends of the pump body 10 is balanced, and the pressure balance pipe 61 is connected to the feed pipe 110, so that the pressure increase caused by the temperature rise of the oil tank 50 is released to the supercharger inlet through the pressure balance pipe 61, ensuring that the difference between the internal pressure of the oil tank 50 and the exhaust pressure of the supercharger is not greater than the inlet and outlet pressure difference of the supercharger, effectively balancing the pressure at various locations inside the pump body 10, thereby forming a closed shell resistant to high pressure. The setting of the pressure gauge 64 can monitor the internal pressure of the supercharger in real time, and can detect and deal with it in the first time when the pipeline is blocked and the air pressure increases abnormally or the pipeline leaks and the air pressure drops abnormally.

[0058] In a preferred embodiment of the present application, an oil mist filtering structure is provided inside the pressure balance pipe 61, which can effectively filter and absorb oil mist or other impurities in the airflow, ensuring the smooth flow of the airflow pipeline.

[0059] As the preferred installation method for the driving rotor 31 and the driven rotor 32 in this application, two driving side bearing holes are formed on the driving side wall panel 11, and the front ends of the driving rotor 31 and the driven rotor 32 are respectively connected to the bearings Z in the two driving side bearing holes, and the driving side bearing holes are isolated from the boost chamber 10a.

[0060] Two non-driving side bearing holes are formed on the non-driving side wall plate 13. The rear ends of the driving rotor 31 and the driven rotor 32 are correspondingly connected to the bearings Z arranged in the two non-driving side bearing holes. The non-driving side bearing holes are isolated from the boost chamber 10a.

[0061] According to the above structural description, the first sealed chamber A is composed of the space between the sealing cover 22 and the coupling guard 14 and the internal space of the two driving side bearing holes, and the second sealed chamber B is composed of the internal space of the oil tank 50 and the internal space of the two non-driving side bearing holes.

[0062] In the present application, the drive side bearing hole and the boost chamber 10a are isolated, and the non-drive side bearing hole and the boost chamber 10a are isolated in the following manner:

[0063] The driving side bearing hole and the non-driving side bearing hole are sealed to the corresponding rotors by piston ring seals 15 and oil seals 16 .

[0064] Preferably, the piston ring seal 15 includes a piston ring and a ring support frame. The ring support frame is fixed on the shaft of the corresponding rotor and rotates with the shaft. The piston ring is made of a material with self-lubricating properties and is floatingly mounted on the corresponding rotor shaft. More preferably, multiple piston rings are used in combination, which has good sealing effect and long service life.

[0065] Among them, the oil seal 16 is arranged between the piston ring seal 15 and the bearing Z. When the internal pressure of the supercharger is suddenly unbalanced and there is a maximum sealing pressure difference, it can seal the lubricating oil well and balance the internal pressure of the oil tank 50 by releasing the air pressure through the pressure balance pipe 61.

[0066] In order to cope with internal seal failures caused by various sudden tooling, the Roots-type high-pressure supercharger of the present application is also provided with a seal inspection assembly 70, and its installation and connection method is as follows: an oil collecting hole 13b is formed at the lower end of the non-drive side wall panel 13, and the oil collecting hole 13b is provided corresponding to the two non-drive side bearing holes and is located between the piston ring seal 15 and the oil seal 16. The seal inspection assembly 70 includes a conduit 71 and an oil sight glass 72, and the conduit 71 connects the oil collecting hole 13b and the oil sight glass 72.

[0067] The oil sight glass 72 can be used to observe the oil level changes of the lubricating oil, determine the leakage of the lubricating oil, and ensure the safe and reliable operation of the equipment. Preferably, an oil level detection instrument can also be installed at the same time for automatic detection and control.

[0068] In the embodiments of the present application, Figure 7 As shown, in order to enhance the heat dissipation of the oil tank 50 , the oil tank 50 is made of aluminum alloy with better heat dissipation performance, and heat dissipation fins 51 are formed on the side wall of the oil tank 50 .

[0069] More preferably, a heat dissipation assembly 80 for dissipating heat from the oil tank 50 is provided on a side of the oil tank 50 away from the pump body 10. It is understood that the heat dissipation of the oil tank 50 can be achieved by either air cooling or water cooling. In this embodiment, air cooling is used as an example. The heat dissipation assembly 80 includes a fan 81 and an outer cover 82. The outer cover 82 is mounted on the outer side of the oil tank 50, and the fan 81 is provided on the outer cover 82.

[0070] During operation, the Roots-type high-pressure supercharger provided herein operates by feeding a working medium (high-pressure gas) into the supercharging chamber 10a through the feed pipe 110. Torque is input to the front end of the driving rotor 31 via the magnetic coupling 20. Driven by the synchronous transmission assembly 40, the Roots impellers on the driving rotor 31 and the driven rotor 32 rotate and generate power, pressurizing the working medium (high-pressure gas) before discharging it through the discharge pipe 120.

[0071] It should be noted that the Roots-type high-pressure booster provided in this application adopts a high-pressure resistant design in terms of connection and sealing requirements, and must pass a high-pressure airtightness test before leaving the factory.

[0072] The present invention fundamentally avoids the shaft seal leakage problem of the high-pressure supercharger and solves the problem of oil mist contamination of the medium in the prior art. It also has high reliability, compact structure and convenient maintenance.

[0073] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A Roots-type high-pressure supercharger with oil mist separation function, characterized in that: Includes pump body, magnetic coupling, rotor assembly, synchronous transmission assembly, oil tank and air pressure balance assembly; A pressurizing chamber is formed inside the pump body, and a feed pipe and a discharge pipe are respectively provided at both ends of the pressurizing chamber. The pump body has a driving side and a non-driving side opposite to each other; The rotor assembly includes a driving rotor and a driven rotor, both of which are rotatably disposed on the pump body, the front end of the driving rotor extending from the driving side and the rear end extending from the non-driving side; the rear end of the driven rotor extending from the non-driving side; The magnetic coupling is installed at the front end of the driving rotor, and the synchronous transmission assembly is installed at the rear end of the rotor assembly, for synchronous rotation of the driving rotor and the driven rotor; The magnetic coupling and the pump body form a first sealed cavity, and the front end of the driving rotor is built into the first sealed cavity; the oil tank is arranged on the non-driving side of the pump body, and the oil tank and the pump body form a second sealed cavity, and the synchronous transmission assembly is built into the second sealed cavity; the air pressure balance assembly connects the feed pipe, the first sealed cavity, and the second sealed cavity and performs oil mist separation; The pump body includes a driving side wall plate, a pump housing and a non-driving side wall plate. Both sides of the pump housing are open. The driving side wall plate and the non-driving side wall plate are respectively sealed and installed on both sides of the pump housing to form a boosting chamber. The air pressure balance assembly includes a pressure balance pipe, the front end of which is connected to the first sealed cavity and the feed pipe via a first pipeline, and the rear end of which is connected to the second sealed cavity via a second pipeline, wherein a pressure gauge is provided on the second pipeline; an oil mist filtering structure is provided inside the pressure balance pipe; Two driving side bearing holes are formed on the driving side wall plate, and the front ends of the driving rotor and the driven rotor are correspondingly connected to the bearings provided in the two driving side bearing holes, and the driving side bearing holes are isolated from the supercharging chamber; two non-driving side bearing holes are formed on the non-driving side wall plate, and the rear ends of the driving rotor and the driven rotor are correspondingly connected to the bearings provided in the two non-driving side bearing holes, and the non-driving side bearing holes are isolated from the supercharging chamber; The driving side bearing hole and the non-driving side bearing hole are sealed to the corresponding rotors by piston ring seals and oil seals; The piston ring seal includes a piston ring and a ring support frame, wherein the ring support frame is fixed on the corresponding rotor shaft and rotates with the shaft, and the piston ring is floatingly sleeved on the corresponding rotor shaft; The oil seal is arranged between the piston ring seal and the bearing; An oil collecting hole is formed at the lower end of the non-driving side wall plate. The oil collecting hole is arranged corresponding to the two non-driving side bearing holes and is located between the piston ring seal and the oil seal. The Roots-type high-pressure supercharger also includes a sealing inspection component, which includes a conduit and an oil sight glass. The conduit connects the oil collecting hole and the oil sight glass.

2. The Roots-type high-pressure supercharger with oil mist separation function according to claim 1, characterized in that: The synchronous transmission assembly includes a driving gear and a driven gear. The driving gear is installed at the rear end of the driving rotor; the driven gear is installed at the rear end of the driven rotor. The driving gear and the driven gear are meshed and transmitted with a transmission ratio of 1.

3. The Roots-type high-pressure supercharger with oil mist separation function according to claim 1, characterized in that: The magnetic coupling includes an active terminal, a sealing cover and a passive terminal. The passive terminal is connected to the front end of the driving rotor. The sealing cover of the sealing cover is installed on the outside of the passive terminal and forms a seal with the driving side wall panel. The active terminal is rotatably arranged on the outside of the sealing cover. The active terminal and the passive terminal are transmitted through magnetic force.

4. The Roots-type high-pressure supercharger with oil mist separation function according to claim 1, characterized in that: A coupling shield is provided on the outer side of the magnetic coupling, and the coupling shield is provided on the driving side wall plate.

5. The Roots-type high-pressure supercharger with oil mist separation function according to claim 1, characterized in that: A heat dissipation component for dissipating heat from the oil tank is provided on one side of the oil tank away from the pump body. The heat dissipation component includes a fan and an outer cover. The outer cover is installed on the outside of the oil tank, and the fan is provided on the outer cover.

6. The Roots-type high-pressure supercharger with oil mist separation function according to claim 5, characterized in that: The outer side wall of the oil tank is formed with heat dissipation fins.

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