A surface treatment method for a scroll component of a scroll compressor

Abstract

The present invention discloses a surface treatment method for a scroll member of a scroll compressor, which includes surface pretreatment, forming a heat insulation layer, and forming a compensation layer in sequence. The compensation layer is used to compensate for the missing dimensional accuracy in the machining of the surface of the scroll member; the heat insulation layer is a zirconia ceramic coating formed by mixing nano-zirconia sol and zirconia nano-hollow spheres; the compensation layer is a polymer layer, and the thickness of the compensation layer is 40um to 60um. The technical solution of the present invention, a surface treatment method for a scroll member of a scroll compressor, forms a compensation layer on the surface of the scroll member of the scroll compressor to compensate for the missing dimensional accuracy in the machining of the surface of the scroll member, so that the dimensional accuracy of the scroll member of the scroll compressor obtained by machining through a CNC machining center meets the requirements, enabling gas sealing and transportation to be achieved during the meshing operation of the surfaces of the orbiting scroll and the stationary scroll of the scroll member, and at the same time, the problem of wear on the surfaces of the orbiting scroll and the stationary scroll caused by excessive contact will not occur.

Description

Technical Field

[0001] The present invention belongs to the field of metal surface processing, and more specifically relates to a surface treatment method for a scroll member of a scroll compressor. Background Art

[0002] A scroll compressor is composed of a fixed involute scroll disk and a moving involute scroll disk that moves eccentrically and translationally, which can form a compressible volume. The moving scroll disk and the stationary scroll disk of the scroll compressor engage with each other. During the working process of suction, compression, and exhaust, the stationary scroll disk is fixed on the frame, and the moving scroll disk is driven by an eccentric shaft and restricted by an anti-rotation mechanism, and rotates in a plane with a very small radius around the center of the base circle of the stationary scroll disk. Gas is inhaled into the periphery of the stationary scroll disk through an air filter element. As the eccentric shaft rotates, the gas is gradually compressed in several crescent-shaped compression cavities formed by the engagement of the moving and stationary scroll disks, and finally continuously discharged through the axial holes of the central component of the stationary scroll disk. It can be seen that when the scroll compressor is working, the scroll members are always dynamically engaged to achieve gas compression and transportation. Therefore, the accuracy requirements for the surface of the scroll members are relatively high. The surfaces of the moving scroll disk and the stationary scroll disk of the scroll members need to contact each other to achieve gas sealing, and at the same time, excessive contact should be avoided to reduce wear.

[0003] In the prior art, the scroll members of scroll compressors are all processed by a CNC machining center. The machining accuracy of a CNC machining center is generally at the 10-μm level, while the accuracy requirements for the surfaces of the moving scroll disk and the stationary scroll disk of the scroll members need to reach the 1-μm level. Therefore, it is difficult for the scroll members of scroll compressors obtained by machining with a CNC machining center to meet the size requirements of the surfaces of the moving scroll disk and the stationary scroll disk of the aforementioned scroll members, resulting in the problem of short service life of the scroll members. Summary of the Invention

[0004] The purpose of the present invention is to provide a surface treatment method for a scroll member of a scroll compressor, so as to solve the problem that the dimensional accuracy of the scroll members of scroll compressors obtained by machining with a CNC machining center in the prior art does not meet the requirements.

[0005] A surface treatment method for a scroll member of a scroll compressor according to the technical solution of the present invention includes sequentially performing surface pretreatment of the scroll member, forming a heat-insulating layer on the surface of the scroll member after the pretreatment is completed, and forming a compensation layer on the surface of the heat-insulating layer. The compensation layer is used to compensate for the missing dimensional accuracy in the machining of the surface of the scroll member; the heat-insulating layer is a zirconia ceramic coating formed by mixing nano-zirconia sol and zirconia nano-hollow spheres; the compensation layer is a polymer layer, and the thickness of the compensation layer is 40 μm to 60 μm.

[0006] Preferably, the surface pretreatment of the vortex component includes: first, sandblasting the surface of the vortex component to obtain a surface roughness greater than 140 um on the surface of the vortex component; then cleaning the surface of the vortex component, including sequentially performing ultrasonic cleaning on the surface of the vortex component with an organic solvent and deionized water, and drying it at a low temperature and dust-free after cleaning;

[0007] Then, perform hard anodic oxidation treatment on the surface of the vortex component to form a hard oxide layer on the surface of the vortex component. Specifically: immerse the surface of the vortex component to be hard anodized in the electrolyte, and perform hard anodic oxidation at a low current density and a high current density successively. After the hard anodic oxidation is completed, perform ultrasonic cleaning with deionized water, and finally dry it at a low temperature and dust-free to obtain a hard oxide layer with a thickness of 35 um to 55 um on the surface of the vortex component.

[0008] Preferably, the organic solvent includes one or several mixtures of gasoline, trichloroethylene, petroleum ether or acetone; the electrolyte is a mixed solution formed by mixing a sulfuric acid solution with a concentration of 180 g / L to 250 g / L and an oxalic acid solution with a concentration of 15 g / L to 25 g / L in a ratio of 28 to 32:1; the temperature of the electrolyte is 18 °C to 20 °C, and the oxidation voltage is 14 V to 16 V; the low current density is 1 A / dm 2 ~2 A / dm 2 , and the hard anodic oxidation time at the low current density is 10 min to 15 min. The high current density is 6 A / dm 2 ~8 A / dm 2 , and the hard anodic oxidation time at the high current density is 85 min to 105 min.

[0009] Preferably, the addition amount of zirconia nano-hollow spheres in the nano-zirconia sol is wt0.1% to wt1.0%; the method for forming the zirconia ceramic coating is: add zirconia nano-hollow spheres to the nano-zirconia sol, and ultrasonically mix to obtain a mixed solution; continuously ultrasonically mix and completely immerse the surface of the vortex component in the mixed solution, and the immersion time is 1 min to 2 min; after the immersion is completed, slowly and uniformly lift the vortex component out, and place it in a muffle furnace, and heat-treat it at 400 °C to 430 °C for 5 min to 7 min. After cooling to room temperature, take out the vortex component from the muffle furnace; repeat the immersion-heat treatment-cooling process at least three times to obtain a heat insulation layer with a thickness of 20 um to 30 um on the surface of the vortex component.

[0010] Preferably, the polymer layer is formed by a mixture of polyether ketone, polyether ether ketone, polytetrafluoroethylene, molybdenum disulfide, carbon fiber and graphene, and the polyether ketone, polyether ether ketone, polytetrafluoroethylene, molybdenum disulfide, carbon fiber and graphene are mixed in a ratio of 10 to 30:10 to 40:5 to 10:2 to 5:2 to 5:1 to 4.

[0011] Preferably, the method for forming the compensation layer is as follows: mixing the above-mentioned polyether ketone, polyether ether ketone, polytetrafluoroethylene, molybdenum disulfide, carbon fiber and graphene in proportion, and then evenly spraying them onto the surface of the scroll component through plasma thermal spraying until it is cured; repeating the plasma thermal spraying and curing process several times until a polymer layer with a thickness of 40 μm to 60 μm is obtained.

[0012] The beneficial effects of the surface treatment method for the scroll component of a scroll compressor according to the technical solution of the present invention are as follows:

[0013] 1. By forming a compensation layer on the surface of the scroll component of the scroll compressor, it is used to compensate for the missing dimensional accuracy in the machining of the scroll component surface, so that the dimensional accuracy of the scroll component of the scroll compressor obtained by machining through a CNC machining center meets the requirements, enabling gas sealing and transportation to be achieved during the engagement of the dynamic scroll surface and the static scroll surface of the scroll component, and at the same time, there will be no problem of excessive wear on the dynamic scroll surface and the static scroll surface due to too tight contact.

[0014] 2. By setting a heat insulation layer, the problem of excessive heating temperature of the scroll component caused by the heat generated during the engagement of the dynamic scroll surface and the static scroll surface is reduced.

[0015] 3. A hard oxidation layer is set to increase the rust and corrosion prevention capabilities of the dynamic scroll surface and the static scroll surface, and at the same time improve the adhesion ability of the heat insulation layer. Specific embodiments

[0016] To facilitate the understanding of the technical solution of the present invention by those skilled in the art, the technical solution of the present invention will be further described below in conjunction with specific embodiments.

[0017] The surface treatment method for the scroll component of a scroll compressor according to the technical solution of the present invention includes, in sequence, pre-treatment of the scroll component surface, forming a heat insulation layer on the scroll component surface after the pre-treatment is completed, and forming a compensation layer on the surface of the heat insulation layer. The compensation layer is used to compensate for the missing dimensional accuracy in the machining of the scroll component surface. The heat insulation layer is a zirconia ceramic coating formed by mixing nano-zirconia sol and zirconia nano-hollow spheres. The compensation layer is a polymer layer, and the thickness of the compensation layer is 40 μm to 60 μm.

[0018] The surface pretreatment of the scroll component includes: First, sandblasting the surface of the scroll component to obtain a surface roughness greater than 140 μm on the surface of the scroll component. Then, cleaning the surface of the scroll component, including sequentially performing ultrasonic cleaning on the surface of the scroll component with organic solvents and deionized water, and drying it at low temperature and dust-free after cleaning. Then, performing hard anodic oxidation treatment on the surface of the scroll component to form a hard oxide layer on the surface of the scroll component. Specifically: Immerse the surface of the scroll component to be subjected to hard anodic oxidation in the electrolyte, and perform hard anodic oxidation at low current density and high current density successively. After the hard anodic oxidation is completed, perform ultrasonic cleaning with deionized water, and finally dry it at low temperature and dust-free to obtain a hard oxide layer with a thickness of 35 μm to 55 μm on the surface of the scroll component.

[0019] The organic solvents include one or several mixtures of gasoline, trichloroethylene, petroleum ether or acetone. The electrolyte is a mixed solution obtained by mixing a sulfuric acid solution with a concentration of 180 g / L to 250 g / L and an oxalic acid solution with a concentration of 15 g / L to 25 g / L in a ratio of 28 to 32:1; the temperature of the electrolyte is 18 °C to 20 °C, and the oxidation voltage is 14 V to 16 V. The low current density is 1 A / dm 2 ~2 A / dm 2 , and the hard anodic oxidation time at low current density is 10 min to 15 min, and the high current density is 6 A / dm 2 ~8 A / dm 2 , and the hard anodic oxidation time at high current density is 85 min to 105 min.

[0020] The addition amount of zirconia nano-hollow spheres in the nano-zirconia sol is wt0.1% to wt1.0%. The forming method of the zirconia ceramic coating is: Add zirconia nano-hollow spheres to the nano-zirconia sol, and mix them ultrasonically to obtain a mixed solution; Continuously mix ultrasonically and completely immerse the surface of the scroll component in the mixed solution, and the immersion time is 1 min to 2 min; After the immersion is completed, lift the scroll component out evenly and transfer it to a muffle furnace, and perform heat treatment at 400 °C to 430 °C for 5 min to 7 min. After cooling to room temperature, take out the scroll component from the muffle furnace; Repeat the immersion - heat treatment - cooling process at least three times to obtain a heat insulation layer with a thickness of 20 μm to 30 μm on the surface of the scroll component.

[0021] The polymer layer is formed by a mixture of polyether ketone, polyether ether ketone, polytetrafluoroethylene, molybdenum disulfide, carbon fiber and graphene, and polyether ketone, polyether ether ketone, polytetrafluoroethylene, molybdenum disulfide, carbon fiber and graphene are mixed in a ratio of 10-30:10-40:5-10:2-5:2-5:1-4. The forming method of the compensation layer is as follows: mix the above polyether ketone, polyether ether ketone, polytetrafluoroethylene, molybdenum disulfide, carbon fiber and graphene according to the ratio, and then spray them evenly onto the surface of the scroll component by plasma thermal spraying until cured; repeat the plasma thermal spraying and curing processes several times until a polymer layer with a thickness of 40um-60um is obtained.

[0022] According to the above technical solution, several groups of qualified dynamic scroll plates and static scroll plates of the same model and batch of scroll compressors obtained by machining through the same CNC machining center are selected for testing.

[0023] Treat the surfaces of the dynamic scroll plate and the static scroll plate in the same embodiment as shown in Table 1.

[0024] Table 1:

[0025]

[0026] Assemble the dynamic scroll plate and the static scroll plate in the same embodiment, and use servo motors with the same power or the same servo motor to drive the scroll compressors assembled by the dynamic scroll plate and the static scroll plate in Embodiments 1 to 9 to work continuously for 360 hours, and obtain the air volume compressed by the compressors in each of Embodiments 1 to 9. A large amount of compressed air indicates good sealing performance of the dynamic scroll plate and the static scroll plate, and a small amount of compressed air indicates poor sealing performance of the dynamic scroll plate and the static scroll plate. Finally, disassemble the dynamic scroll plate and the static scroll plate, and observe the wear conditions of the working surfaces of the dynamic scroll plate and the static scroll plate.

[0027] After observation, the dynamic scroll plate and the static scroll plate processed according to Embodiments 1 and 2 have poor sealing performance and cannot meet the sealing requirements for the operation of the compressor, indicating that the dimensional accuracy of the dynamic scroll plate and the static scroll plate obtained by machining through the CNC machining center cannot meet the sealing requirements, and the surfaces of the dynamic scroll plate and the static scroll plate are slightly worn. Moreover, the surfaces of the dynamic scroll plate and the static scroll plate in Embodiment 1 heat up severely, and the surfaces of the dynamic scroll plate and the static scroll plate in Embodiment 2 heat up slightly better than those in Embodiment 1.

[0028] After observation, the dynamic scroll plate and the static scroll plate processed according to Embodiment 9 have the best sealing performance, but the surfaces of the dynamic scroll plate and the static scroll plate are worn most severely. Therefore, the dimensions of the dynamic scroll plate and the static scroll plate processed according to Embodiment 9 are too large, and the dynamic scroll plate and the static scroll plate are too tightly engaged. At the same time, the dynamic scroll plate and the static scroll plate in this Embodiment 9 heat up more severely than those in Embodiment 2 and slightly less severely than those in Embodiment 1.

[0029] After observation, the dynamic scroll plate and the static scroll plate processed according to Embodiment 3 have general sealing performance, and the surfaces of the dynamic scroll plate and the static scroll plate are worn relatively severely.

[0030] Upon observation, for the moving scroll and the stationary scroll processed according to Embodiment 4, the sealing performance is average, better than that of Embodiment 2, but worse than that of Embodiment 3. The surfaces of the moving scroll and the stationary scroll are slightly worn, and in this Embodiment 4, the moving scroll and the stationary scroll generate slight heat.

[0031] Upon observation, for the moving scroll and the stationary scroll processed according to Embodiments 5 to 8, the sealing performance is excellent, not inferior to that of Embodiment 9. The surfaces of the moving scroll and the stationary scroll are basically not worn, and the moving scroll and the stationary scroll generate slight heat.

[0032] In summary, for the moving scroll and the stationary scroll processed according to Embodiments 5 to 8, the performance is the best, which can meet the sealing requirements. The moving scroll and the stationary scroll are properly pressed together, and the surfaces of the moving scroll and the stationary scroll are basically not worn, meeting the requirements.

[0033] Therefore, in summary, by forming a compensation layer on the surface of the scroll components of the scroll compressor to compensate for the missing dimensional accuracy in the machining of the scroll component surfaces, the dimensional accuracy of the scroll components of the scroll compressor obtained by machining through a CNC machining center meets the requirements, enabling gas sealing and transportation to be achieved during the engagement of the surfaces of the moving scroll and the stationary scroll of the scroll components, and at the same time, the problem of wear on the surfaces of the moving scroll and the stationary scroll caused by excessive contact will not occur. And by setting up a heat insulation layer, the heating conditions of the moving scroll and the stationary scroll are improved.

[0034] The technical solution of the present invention has been described exemplarily above in combination with the embodiments. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A surface treatment method for a scroll component of a scroll compressor, characterized in that, It includes successively performing surface pretreatment on the scroll component to form a hard anodized layer with a thickness of 35 um to 55 um on the surface of the scroll component, forming a heat insulation layer with a thickness of 20 um to 30 um on the surface of the scroll component after the pretreatment is completed, and forming a compensation layer on the surface of the heat insulation layer; The compensation layer is used to compensate for the missing dimensional accuracy in the machining of the surface of the scroll component; the heat insulation layer is a zirconia ceramic coating formed by mixing nano-zirconia sol and zirconia nano-hollow spheres; The compensation layer is a polymer layer, the thickness of the compensation layer is 40 um to 60 um, the polymer layer is formed by a mixture of polyether ketone, polyether ether ketone, polytetrafluoroethylene, molybdenum disulfide, carbon fiber and graphene, and the polyether ketone, polyether ether ketone, polytetrafluoroethylene, molybdenum disulfide, carbon fiber and graphene are mixed in a ratio of 10 to 30:10 to 40:5 to 10:2 to 5:2 to 5:1 to 4; The forming method of the compensation layer is: mixing the above-mentioned polyether ketone, polyether ether ketone, polytetrafluoroethylene, molybdenum disulfide, carbon fiber and graphene in proportion, and then uniformly spraying them onto the surface of the scroll component by plasma thermal spraying until curing; repeating the plasma thermal spraying and curing process several times until a polymer layer with a thickness of 40 um to 60 um is obtained.

2. The surface treatment method of the scroll member of the scroll compressor according to claim 1, wherein, The surface pretreatment of the scroll component includes: First, perform sandblasting on the surface of the scroll component so that the surface roughness of the scroll component is greater than 140 um; Then, clean the surface of the scroll component, including successively performing ultrasonic cleaning on the surface of the scroll component with organic solvents and deionized water, and drying it at low temperature and dust-free after cleaning; Then, perform hard anodizing treatment on the surface of the scroll component to form a hard anodized layer on the surface of the scroll component. Specifically: immerse the surface of the scroll component to be hard anodized in the electrolyte, and perform hard anodizing at low current density and high current density successively. After the hard anodizing is completed, perform ultrasonic cleaning with deionized water, and finally dry it at low temperature and dust-free to obtain a hard anodized layer with a thickness of 35 um to 55 um on the surface of the scroll component.

3. The surface treatment method of the scroll member of the scroll compressor according to claim 2, characterized in that, The organic solvent includes one or several mixtures of gasoline, trichloroethylene, petroleum ether or acetone; The electrolyte is a mixed solution formed by mixing a sulfuric acid solution with a concentration of 180 g / L to 250 g / L and an oxalic acid solution with a concentration of 15 g / L to 25 g / L in a ratio of 28 to 32:1; the temperature of the electrolyte is 18 °C to 20 °C, and the oxidation voltage is 14 V to 16 V; The low current density is 1 A / dm 2 ~2 A / dm 2 , and the hard anodizing time is 10 min to 15 min at the low current density. The high current density is 6 A / dm 2 ~8 A / dm 2 , and the hard anodizing time is 85 min to 105 min at the high current density.

4. The surface treatment method of the scroll member of the scroll compressor according to claim 1, wherein The addition amount of zirconia nano-hollow spheres in the nano-zirconia sol is wt0.1% to wt1.0%; The forming method of the zirconia ceramic coating is as follows: Add zirconia nano hollow spheres into nano zirconia sol, and mix them ultrasonically to obtain a mixed solution; Continuously mix ultrasonically and completely immerse the surface of the vortex component in the mixed solution, with the immersion time being 1 min to 2 min; After the immersion is completed, slowly and uniformly lift out the vortex component and put it into a muffle furnace, and perform heat treatment at 400 °C to 430 °C for 5 min to 7 min. After cooling to room temperature, take out the vortex component from the muffle furnace; Repeat the immersion - heat treatment - cooling process at least three times to obtain a heat insulation layer with a thickness of 20 μm to 30 μm on the surface of the vortex component.

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