Vacuum pump with cladding structure

Abstract

This utility model relates to the field of vacuum pump technology, specifically a vacuum pump with a cladding structure. It includes: a pump housing, the inner cavity of which is provided with a composite layer; the composite layer includes: a pump body layer formed on the inner wall of the pump housing; a cladding layer covering the pump body layer; and a lubricating layer covering the cladding layer. The cladding layer is made of a cobalt-based alloy. The lubricating layer is made of solid molybdenum disulfide. The pump body layer includes: microgrooves formed on the inner wall of the pump housing; microgrids separating adjacent microgrooves; and microprotrusions located at the center of the microgrooves. The cladding layer includes: microspirals formed on the inner wall of the cladding layer. The microgrooves have a bottom area of ​​1 mm². 2 The groove is a regular hexagon with a depth of 0.05 mm. The micro-protrusion has a base area of ​​0.25 mm². 2 The hexagonal boss has a height of 0.05mm. The helix angle of the micro-spiral pattern is 45°. This significantly improves wear resistance and sealing stability.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically a vacuum pump with a cladding structure. Background Technology

[0002] A vacuum pump is a device used to extract gas molecules from a closed system, thereby creating a partial or complete vacuum environment. They are widely used in various fields such as industrial manufacturing, scientific research, medical equipment, and laboratories. Based on different working principles and technical parameters, vacuum pumps can be divided into several types, each with its specific application scenarios and advantages.

[0003] Among them, the screw vacuum pump is a high-efficiency dry vacuum pump that uses a pair of meshing screw rotors to compress and expel air, thereby creating a vacuum environment. Screw vacuum pumps are widely used due to their high efficiency and low maintenance requirements. The pump body is the core component of the entire equipment; it not only supports one or more pairs of meshing screw rotors but also forms a sealed working chamber, ensuring that the gas can be effectively compressed and discharged.

[0004] The design and manufacturing quality of the pump body wall in a screw vacuum pump directly affect the pump's sealing performance, durability, and overall performance. In traditional vacuum pumps, under high-speed rotation, the rotor end face is prone to dry friction wear against the pump chamber wall, leading to seal failure and reduced pumping efficiency. Existing technologies using surface hardening or hard alloy spraying suffer from low strength and weak bonding. Utility Model Content

[0005] In order to solve the technical problems existing in the background art, the present invention provides a vacuum pump with a cladding structure, which significantly improves wear resistance and sealing stability.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] Vacuum pumps with cladding structures include:

[0008] Pump casing, the inner cavity of the pump casing is provided with a composite layer;

[0009] The composite layer includes:

[0010] The pump body layer is formed on the inner wall surface of the pump casing;

[0011] The cladding layer covers the pump body layer;

[0012] A lubricating layer, covering the cladding layer.

[0013] Furthermore, the cladding layer is made of a cobalt-based alloy.

[0014] Furthermore, the lubricating layer is made of solid molybdenum disulfide.

[0015] Furthermore, the pump body layer includes:

[0016] Microgrooves are formed on the inner wall surface of the pump casing;

[0017] Microgrid, where adjacent microgrooves are separated by microgrids;

[0018] The micro-boss is located at the center of the micro-groove.

[0019] Furthermore, the cladding layer includes:

[0020] Micro-spiral patterns are formed on the inner wall surface of the cladding layer.

[0021] Furthermore, the microgroove has a bottom area of ​​1 mm. 2 The groove is a regular hexagon with a depth of 0.05mm.

[0022] Furthermore, the micro-protrusion has a base area of ​​0.25 mm². 2 The regular hexagonal boss has a height of 0.05mm.

[0023] Furthermore, the helix angle of the micro-spiral pattern is 45°.

[0024] The beneficial effects of this utility model are:

[0025] (1) By setting microgrooves and microprotrusions on the pump body layer, the bonding strength between the cladding layer and the pump body layer is effectively improved.

[0026] (2) By setting micro spiral patterns on the cladding layer, the bonding strength between the cladding layer and the lubrication layer is effectively improved.

[0027] (3) By setting a lubricating layer of molybdenum disulfide, the friction coefficient between the pump casing cavity and the rotor is reduced, which significantly improves the wear resistance life.

[0028] (4) By setting a cladding layer of cobalt-based alloy material, the strength of the pump housing cavity is improved, which effectively extends the overall service life of the vacuum pump. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a schematic diagram of the structure of this utility model;

[0031] Figure 2 This is an exploded view of the flattened structure of the composite layer;

[0032] Figure 3 This is a schematic diagram of the flattened structure of the pump body layer;

[0033] Figure 4 This is a schematic diagram of the flattened structure of the cladding layer.

[0034] In the picture:

[0035] 1. Pump casing; 2. Composite layer;

[0036] 21. Pump body layer; 22. Cladding layer; 23. Lubricating layer;

[0037] 211. Microgroove; 212. Micro-bore; 213. Micromesh;

[0038] 221. Micro spiral pattern. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings.

[0040] like Figure 1 As shown, the specific structure of the vacuum pump with the cladding structure includes a pump casing 1, and a composite layer 2 is provided in the inner cavity of the pump casing 1. The inner cavity of the pump casing 1 is used to accommodate the vacuum pump rotor.

[0041] like Figure 2 As shown, the specific structure of composite layer 2 includes a pump body layer 21, which is formed on the inner wall surface of the pump housing 1. A cladding layer 22 covers the pump body layer 21. A lubricating layer 23 covers the cladding layer 22. The cladding layer 22 is applied to the pump body layer 21 using a laser cladding process.

[0042] The cladding layer 22 is made of a cobalt-based alloy. Cobalt-based alloys are high-performance metallic materials with cobalt as the main matrix element and strengthened by the addition of alloying elements such as chromium, tungsten, molybdenum, and nickel. Due to their excellent high-temperature strength, superior high-temperature wear resistance, and outstanding high-temperature corrosion resistance, cobalt-based alloys have become key materials for extreme environments. They also possess good thermal fatigue resistance and a certain degree of chemical corrosion resistance. By incorporating the cobalt-based alloy cladding layer 22, the strength of the pump casing cavity is improved, effectively extending the overall service life of the vacuum pump.

[0043] The lubricating layer 23 is made of solid molybdenum disulfide. Molybdenum disulfide is an important inorganic solid lubricant and semiconductor material with a structure similar to graphite, consisting of molybdenum atomic layers sandwiched between two sulfur atomic layers, forming a stable layered crystal structure. Molybdenum disulfide is a high-performance layered solid lubricant with excellent wear resistance, excellent high-temperature stability, and good chemical stability. By using a lubricating layer 23 made of molybdenum disulfide, the coefficient of friction between the pump casing cavity and the rotor is reduced, significantly improving wear life.

[0044] like Figure 3As shown, the pump body layer 21 has a specific structure including microgrooves 211, which are formed on the inner wall of the pump housing 1. Adjacent microgrooves 211 are separated by micromesh 213. Micro-protrusions 212 are disposed at the center of the microgrooves 211. In a specific embodiment, the microgrooves 211 have a bottom area of ​​1 mm. 2 The groove is a regular hexagon with a depth of 0.05 mm. The micro-protrusion 212 has a base area of ​​0.25 mm². 2 The microgrid 213 has a height of 0.05 mm and a width of 0.5 mm. Microgrooves 211 and microprotrusions 212 are located on the contact surface between the pump body layer 21 and the cladding layer 22. By providing microgrooves 211 and microprotrusions 212 on the pump body layer, the bonding strength between the cladding layer 22 and the pump body layer 21 can be effectively improved.

[0045] like Figure 4 As shown, the cladding layer 22 includes micro-spirals 221, which are formed on the inner wall surface of the cladding layer 22. In a specific embodiment, the helix angle of the micro-spirals 221 is 45°. The micro-spirals 221 are located on the contact surface between the cladding layer 22 and the lubrication layer 23. By providing micro-spirals 221 on the cladding layer 22, the bonding strength between the cladding layer 22 and the lubrication layer 23 is effectively improved.

[0046] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A vacuum pump with a cladding structure, characterized in that, include: Pump housing (1), the inner cavity of which is provided with a composite layer (2); The composite layer (2) includes: Pump body layer (21) is formed on the inner wall surface of the pump casing (1); A cladding layer (22) is applied over the pump body layer (21); A lubricating layer (23) covers the cladding layer (22).

2. The vacuum pump with a cladding structure according to claim 1, characterized in that, The cladding layer (22) is made of a cobalt-based alloy.

3. The vacuum pump with a cladding structure according to claim 1, characterized in that, The material of the lubricating layer (23) is solid molybdenum disulfide.

4. The vacuum pump with a cladding structure according to claim 1, characterized in that, The pump body layer (21) includes: Microgrooves (211) are formed on the inner wall surface of the pump housing (1); Microgrid (213), adjacent microgrooves (211) are separated by microgrid (213); A micro-protrusion (212) is located at the center of a micro-groove (211).

5. The vacuum pump with a cladding structure according to claim 1, characterized in that, The cladding layer (22) includes: Micro-spiral patterns (221) are formed on the inner wall surface of the cladding layer (22).

6. The vacuum pump with a cladding structure according to claim 4, characterized in that, The microgroove (211) has a bottom area of ​​1 mm. 2 The groove is a regular hexagon with a depth of 0.05mm.

7. The vacuum pump with a cladding structure according to claim 4, characterized in that, The micro-protrusion (212) has a bottom area of ​​0.25 mm. 2 The regular hexagonal boss has a height of 0.05mm.

8. The vacuum pump with a cladding structure according to claim 5, characterized in that, The spiral angle of the micro-spiral pattern (221) is 45°.

Images