Scroll type fluid machine

Abstract

The purpose of the present application is to provide a scroll-type fluid machine in which, when operating a scroll-type fluid machine provided with a fixed scroll and a movable scroll made of an aluminum material therein, the scroll bodies do not undergo problems such as sintering, abrasion, or breakage even if the two scroll bodies are exposed to a high-speed and high-load environment for a long period of time. In order to solve the technical problem, the present application relates to a scroll-type fluid machine capable of compressing or expanding a fluid in a space formed between a pair of relatively rotatable scroll bodies, the scroll bodies being made of aluminum or an aluminum alloy, an anodic oxide film having a thickness of 0.3 [mu] m to 10.0 [mu] m is applied to the surface of the scroll body, and a resin film is disposed on the surface of the anodic oxide film.

Description

Technical Field

[0001] The present application relates to a scroll type fluid machine in which an anodic oxide film and a resin film are provided on the surface of a pair of scroll bodies made of aluminum or an aluminum alloy (hereinafter also referred to as an aluminum material). Background Art

[0002] As one type of fluid machinery, a scroll type fluid machinery is known, which has a pair of scroll bodies composed of a fixed scroll and a movable scroll inside, and the movable scroll rotates relative to the fixed scroll, thereby compressing or expanding the volume of a fluid such as a gas or liquid sucked into the fluid machinery and discharging it to the outside of the fluid machinery.

[0003] The pair of scroll bodies will slide against each other when the fluid machinery is working and generate friction heat on the sliding surface. The scroll bodies may fuse or stick to each other, resulting in sintering and other failures. Therefore, in order to reduce the friction coefficient of the sliding surface, lubricating oil or resin film is provided on the surface of the scroll body.

[0004] However, for customers with strict quality requirements, the scroll body will be exposed to high-speed and high-load environments for a long time when the fluid machinery is working, and as a result, the resin film may peel off from the surface of the scroll body. At this time, if the scroll body is made of aluminum, it may dissolve or stick at a lower temperature than iron or copper. In addition, if the scroll bodies stick to each other at the part where the resin film peels off, there is a risk of damage to the fluid machinery.

[0005] Patent document 1 discloses "a method for manufacturing a scroll component for a volumetric compressor, wherein the surface of the spiral wall of at least one component in a group of scroll components is roughened, a fluorine-based resin film is formed with a thickness of 20 to 1000 μm, and then the spiral walls of the scroll components are pressed together and subjected to eccentric orbital motion while being engaged with each other, so that the fluorine-based resin film is slidably worn to a predetermined film thickness". Here, the material constituting the scroll component of Patent document 1 is a metal such as steel or aluminum.

[0006] Patent document 2 discloses "a scroll-type oil-free fluid machinery, in which an anodized film filled with a solid lubricant such as molybdenum disulfide is formed on the surfaces of a fixed scroll and an orbiting scroll, and a polytetrafluoroethylene-based synthetic resin material is coated on at least a portion of any scroll forming the film." Prior art literature Patent Literature

[0007] Patent document 1: Japanese Patent Laid-Open No. 9-88851 Patent document 2: Japanese Patent Laid-Open No. 7-217562 Summary of the invention Technical problem to be solved by the invention

[0008] The roughening treatment method adopted by the invention described in Patent Document 1 is specifically the sandblasting method. This sandblasting method is not suitable as a method for finely roughening the surface of a component under fine control. Compared with the surface of the constituent metal that has not been roughened, the surface roughness of the scroll component roughened by the sandblasting method is greatly increased. Therefore, in order not to expose the roughened metal surface and to form a fluorine-based resin film with a roughly flat shape on the surface, the film thickness of the fluorine-based resin film must be made too large, which will increase the manufacturing cost of the product. In addition, in Patent Document 2, it is necessary to form an anodized film filled with a solid lubricant on both surfaces of the fixed scroll and the rocking scroll, which increases the manufacturing time and cost of the product.

[0009] The invention involved in this application aims to provide a scroll-type fluid machinery. When a scroll-type fluid machinery having a fixed scroll and a movable scroll made of aluminum or aluminum alloy inside is operated under stringent market demands, even if the two scroll bodies are exposed to a high-speed and high-load environment for a long time, problems such as sintering, wear, and breakage of the scroll body due to abnormal wear of the resin film or peeling off from the surface of the scroll body will not occur, and the manufacturing cost of the product can be suppressed. Technical solutions adopted to solve technical problems

[0010] After in-depth research, the inventor finally determined to use the following means to solve the above technical problems.

[0011] The present application relates to a scroll-type fluid machinery which can compress or expand fluid in a space formed between a pair of scroll bodies which can rotate relative to each other, wherein the scroll body is made of aluminum or an aluminum alloy, an anodized film with a thickness of 0.3 μm to 10.0 μm is applied to the surface of the scroll body, and a resin film is arranged on the surface of the anodized film.

[0012] The surface roughness Rz of the anodized film of the scroll-type fluid machine according to the present application is preferably 1.5 μm to 9.0 μm.

[0013] The thickness of the resin film of the scroll-type fluid machine according to the present application is preferably 5 μm or more.

[0014] The scroll body in the scroll-type fluid machinery involved in this application comprises a bottom plate and a spiral wrapping member protruding from the surface of the bottom plate, and the height of the wrapping member of one scroll body is preferably designed to be lower than the height of the wrapping member of the other scroll body.

[0015] When the surround height of one of a pair of scroll bodies is designed to be lower than that of the other scroll body, the anodized film and resin film of the scroll-type fluid machinery involved in this application are preferably arranged in sequence on the surface of the scroll body with the lower surround height. Effects of the Invention

[0016] The invention involved in this application can provide a scroll-type fluid machinery. When a scroll-type fluid machinery having a fixed scroll and a movable scroll made of aluminum or aluminum alloy inside is operated under stringent market demands, even if the two scroll bodies are exposed to a high-speed and high-load environment, problems such as sintering, wear, and breakage of the scroll body due to abnormal wear of the resin film or peeling off from the surface of the scroll body will not occur, and the manufacturing cost of the product can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure shows a cross-sectional view of a pair of scroll bodies in the scroll-type fluid machinery involved in the present application. Figure 2 Shown are appearance photographs of (A) an example of the present application and (B) a comparative example. DETAILED DESCRIPTION

[0018] The following reference Figure 1 and Figure 2 An embodiment of the scroll type fluid machine according to the present application will be described.

[0019] The scroll-type fluid machinery involved in this application can compress or expand the fluid in the space formed between a pair of scroll bodies that can rotate relative to each other. The scroll body is made of aluminum or an aluminum alloy, and an anodized film with a thickness of 0.3μm to 10.0μm is applied to the surface of the scroll body. Moreover, a resin film is also arranged on the surface of the anodized film. Since the scroll-type fluid machinery involved in this application has this structure, a scroll-type fluid machinery with the following excellent effects can be provided. When the scroll-type fluid machinery with a fixed scroll and a movable scroll made of aluminum or an aluminum alloy inside is operated under strict market demands, even if the two scroll bodies are exposed to a high-speed and high-load environment for a long time, the resin film 4 will not be abnormally worn or peeled off from the surface of the scroll body, resulting in sintering, wear, breakage and other problems of the scroll body, and the manufacturing cost of the product can be suppressed.

[0020] The scroll-type fluid machinery inhales a fluid such as air, water, various refrigerants, or gas or liquid from the suction port of the fluid machinery, compresses or expands the volume of the fluid by the rotational motion of the movable scroll 2 relative to the fixed scroll 1, and discharges it to the outside from the discharge port. Specifically, the fixed scroll 1 and the movable scroll 2 have a spiral wrap protruding from the upper surface 6 of the bottom plate (the upper surface 6 of the bottom plate here refers to the bottom plate surface on the side where the spiral wrap protrudes). Moreover, the spiral wrap is engaged with each other, a pair of fixed scrolls 1 and movable scrolls 2 are engaged, and they are arranged in a shell to manufacture a scroll-type fluid machinery. The space formed by each spiral wrap of the fixed scroll 1 and the movable scroll 2 is the part of the fluid that is compressed or expanded. Moreover, in the case where the fixed scroll 1 and the movable scroll 2 are made of metal materials, as a prior art, one or both surfaces thereof are provided with lubricating oil or resin film, etc., to reduce the friction coefficient of the sliding surface.

[0021] Here, a pair of scroll bodies used in a scroll-type fluid machine is generally structured such that the heights of the spiral wraps of the two scroll bodies are almost the same, and the upper surface pressure of the spiral wraps of the fixed scroll 1 and the movable scroll 2 is reduced by running-in. However, in the case where the heights of the spiral wraps are almost the same, the upper surface 5 (front end of the wrap) of the spiral wrap may be worn or damaged depending on the hardness or lubricity of the surface treatment material provided for improving lubricity or protecting the surface of the scroll body.

[0022] On the other hand, for example, Figure 1 In the form shown, if the height of the spiral wrapping of the movable scroll 2 is higher than that of the fixed scroll 1, when the vortex-type fluid machinery is working, the rotational movement of the movable scroll 2 will cause the upper surface 6 of the bottom plate of the fixed scroll 1 to slide intermittently, while the upper surface of the spiral wrapping of the movable scroll 2 will slide continuously. This structure can greatly reduce the possibility of wear and damage to the upper surface 5 (front end of the wrapping) of the spiral wrapping of the scroll body. Moreover, in such a pair of scroll bodies, if a resin film 4 is set on only one scroll body to suppress the manufacturing cost of the product, when the fluid machinery is working, it is more possible to prevent abnormal wear or peeling of the resin film 4 by setting the resin film 4 on the scroll body on which the upper surface 6 of the bottom plate slides intermittently than by setting the resin film on the scroll body on which the upper surface of the spiral wrapping slides continuously, and it can more effectively increase the surface pressure (critical surface pressure) caused by sintering and noise between the fixed scroll 1 and the movable scroll 2. This is because the resin film of the continuous sliding part is more easily worn than the intermittent sliding part.

[0023] Moreover, in a scroll-type fluid machinery in which the height of the surround of one of a pair of scroll bodies is designed to be lower than the height of the surround of the other scroll body, in the case where the resin film 4 is provided only on the scroll body with a low surround height, the anodized film 3 described later is also preferably applied only to the surface of the scroll body with a low surround height. If the anodized film 3 is applied to the surface of the scroll body, the surface roughness Rz increases. Therefore, in a state where the surface of the anodized film 3 is exposed, there is a risk of being aggressive and damaging the scroll body on the other side (more specifically, the resin film arranged on the scroll body on the other side).

[0024] <Scroll body> The scroll body used in the scroll type fluid machinery involved in the present application adopts aluminum or aluminum alloy (aluminum material) as its constituent material for reasons such as easy processing, light weight and relatively low price. In addition, in the case where the scroll body requires particularly high strength, aluminum silicon alloy (Al-Si alloy, also known as 4000 aluminum alloy) is sometimes used as its constituent material.

[0025] Here, in the mechanical field such as the automobile industry where customers have particularly strict quality requirements, for fluid machinery with built-in scroll bodies, in addition to being able to run at high speed for a long time, the scroll body also needs to have durability under high-load environments. In this case, if a resin film 4 is directly set on the surface of the scroll body, the resin film 4 may peel off when the fluid machinery works according to market requirements. At this time, if the scroll body is made of aluminum, it may dissolve or adhere at a lower temperature than iron or copper. Moreover, if the scroll bodies adhere to each other in the part where the resin film 4 peels off, there is a risk of damage to the fluid machinery. In order to prevent this situation, if the surface of the scroll body is anodized (anodized) in advance and an anodized film 3 (anodized film) with a specified film thickness is provided, the surface roughness Rz is increased compared to the aluminum material (aluminum substrate) constituting the scroll body, so the tightness of the resin film 4 is improved through the anchor effect.

[0026] <Anodic oxide film> The anodized film 3 is composed of aluminum oxide with a porous surface. Its surface roughness Rz varies with the film thickness. When the film thickness is around 0.15μm to 2.0μm, the Rz value increases sharply. Therefore, if an anodized film 3 with a specified film thickness is applied to the surface of the scroll body, the adhesion between the anodized film 3 and the resin film 4 can be improved through the anchor effect. Moreover, as mentioned above, since the surface of the anodized film 3 is porous, the apparent surface area (specific surface area) is large, and it is easier to obtain the anchor effect compared to the case where only the surface roughness Rz is large. Furthermore, by applying the anodized film 3 to the surface of the scroll body, even if a part of the resin film 4 is peeled off, the exposed surface is not the aluminum material (aluminum substrate) constituting the scroll body, but the anodized film (aluminum oxide). Therefore, the scroll bodies can be prevented from sticking to each other. For these reasons, by applying an anodized film 3 having a specified film thickness to the surface of the vortex body and arranging a resin film 4 on the surface of the anodized film 3, it is possible to ensure that the resin film 4 on the vortex body is prevented from peeling off and the vortex bodies are prevented from sticking to each other, causing damage to the fluid machinery, even if the fluid machinery with a built-in vortex body is operated for a long time under a high-speed and high-load environment.

[0027] The suitable film thickness of the anodized film 3 is 0.3μm to 10.0μm. If the film thickness of the anodized film 3 is less than 0.3μm, its surface roughness Rz is almost not increased compared with the aluminum material (aluminum substrate before anodizing treatment) constituting the scroll body, and it is difficult to improve the adhesion of the resin film 4 through the anchor effect, so it is not preferred. On the other hand, if the film thickness of the anodized film 3 is greater than 10.0μm, the surface roughness Rz becomes too large. In order not to expose the surface of the anodized film 3 and form a roughly flat resin film 4, the film thickness of the resin film 4 has to be set too large. Therefore, the thermal conductivity of the scroll body provided with the resin film 4 is reduced, the heat dissipation is reduced, it is difficult to control the dimensional change of the resin film 4 caused by frictional heat, and the manufacturing cost of the product is increased, so it is not preferred. Moreover, the more suitable film thickness of the anodized film 3 is 0.3μm to 3.0μm. If the film thickness of the anodized film 3 is less than 3.0 μm, the surface roughness Rz is moderate, and the protection of the surface of the scroll body and the improvement of lubricity can be achieved without forming an overly thick resin film 4, thereby suppressing the manufacturing cost of the product. In addition, compared with the case where the film thickness is greater than 3.0 μm, if the film thickness of the anodized film 3 is less than 3.0 μm, the arithmetic mean roughness Ra is smaller, and the uneven film thickness of the anodized film 3 can be controlled to be smaller.

[0028] The surface roughness Rz (maximum surface roughness) of the anodized film is preferably 1.5 μm to 9.0 μm. If the surface roughness Rz of the anodized film is less than 1.5 μm, it is difficult to improve the adhesion of the resin film 4 by the anchor effect, so it is not preferred. On the other hand, if the surface roughness Rz of the anodized film is greater than 9.0 μm, in order not to expose the surface of the anodized film 3 and form a roughly flat resin film 4, the film thickness of the resin film 4 has to be set too large, and it is difficult to control the dimensional change of the resin film 4 caused by frictional heat. At the same time, the manufacturing cost of the product increases, so it is not preferred.

[0029] <Resin film> The composition of the resin film 4 is not particularly limited, but preferably contains a lubricant and a binder resin. Examples of lubricants include fluororesins such as tetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFA), and perfluoroethylene fluorine copolymer (FEP), molybdenum disulfide, and graphite. Among them, as a fluororesin, tetrafluoroethylene (PTFE) is preferably used from the viewpoints of heat resistance and durability. If the resin film 4 contains lubricants such as fluororesins, molybdenum disulfide, and graphite, even if the formation of the resin film 4 is omitted on one of a pair of vortex bodies for the purpose of controlling manufacturing costs, the vortex body ( Figure 1 In the case of the surface of the moving scroll 2), the lubricity and wear resistance of the resin film 4 are effectively improved. In addition, as the adhesive resin, from the viewpoints of heat resistance, durability, processability, etc., polyimide resin is preferably used. The polyimide resin is not only the main component of the resin film 4, but also a component for fixing the lubricant on the scroll body.

[0030] The appropriate film thickness of the resin film 4 is above 5 μm. If the film thickness of the resin film 4 is less than 5 μm, it depends on the film thickness of the anodized film 3. It is difficult to make the surface of the resin film 4 roughly flat without exposing the surface of the anodized film 3 and forming the resin film 4 on its surface, so it is not preferred. In addition, if the film thickness of the resin film 4 is less than 5 μm, even if the height of the surround of one scroll body is designed to be lower than the height of the surround of the other scroll body, when the fluid machinery works at high speed for a long time, until the scroll body on the other side is worn with the resin film 4, the possibility of the resin film 4 disappearing due to wear is high, or the resin film 4 may be peeled off due to friction heat, etc., so it is not preferred. Moreover, the film thickness of the resin film 4 is more preferably 5 μm to 30 μm. If the film thickness of the resin film 4 is greater than 30 μm, the thermal conductivity of the scroll body provided with the resin film 4 is reduced, the heat dissipation is reduced, it is difficult to control the dimensional change of the resin film 4 caused by friction heat, and the manufacturing cost of the product is increased, so it is not preferred. In addition, if the film thickness of the resin film 4 is greater than 30μm, the distance between the surface of the resin film 4 and the surface of the other side scroll body (if the surface of the other side scroll body is also arranged with anodized film and resin film, it is the surface of the resin film) is too close. Since the running-in time between the other side scroll body and the resin film 4 is too short, the resin film 4 is prone to cracks or peeling due to surface contact between the other side scroll body and the resin film 4, so it is not preferred.

[0031] Here, the film thickness of the resin film 4 is preferably within the above-mentioned numerical range. The surfaces of the scroll body are the upper surface 5 of the spiral wrap and the upper surface 6 of the base plate. On the other hand, since the friction generated by sliding on the side 7 of the spiral wrap is small and the sliding is intermittent, the lubricating oil pre-applied to the surface of the component is easy to maintain. Therefore, for the resin film 4 on the side 7 of the spiral wrap, even if the film thickness is less than 20μm, the scroll body is not prone to sintering, wear, breakage and other problems. Therefore, the appropriate film thickness of the resin film 4 on the side 7 of the spiral wrap is 5μm to 20μm. The above is a description of the scroll-type fluid machinery involved in the present application. The following will introduce the manufacturing method of the scroll-type fluid machinery involved in the present application.

[0032] <Method for forming anodized film> The anodized film 3 provided on the surface of the scroll body can be formed by anodizing using a conventionally known sulfuric acid bath or oxalic acid bath. In the case of a sulfuric acid bath, for example, a sulfuric acid concentration of 10 mass % to 20 mass %, a treatment temperature of 10° C. to 25° C., and a current density of 0.5 A / dm 2 ~1.5A / dm 2 In the case of an oxalic acid bath, for example, an oxalic acid concentration of 2.0 mass % to 5.0 mass %, a treatment temperature of 20° C. to 35° C., and a current density of 2.0 A / dm 2 ~3.0A / dm2 The processing conditions are sufficient.

[0033] <Method for forming resin film> The resin film 4 provided on the surface of the anodized film 3 can be formed by using a resin composition and adopting a conventionally known method such as a spraying method or an immersion method. The method for forming the resin film 4 is not particularly limited, but if the spraying method is adopted, for example, compared with the immersion method, for a scroll body having a complex shape, the resin film 4 of the required film thickness can be formed only on the required part as required in a relatively short time, which is preferred.

[0034] As the spraying method, a previously known method such as a handheld spray gun or a robot spraying system can be used. The atomization pressure in the spraying method depends on the composition of the resin composition as a raw material, and is preferably 0.05MPa to 0.2MPa. If the atomization pressure is less than 0.05MPa, it is difficult to fully spray the resin composition as a raw material onto the corner formed by the side 7 of the spiral wrap and the upper surface 6 of the base plate, resulting in the film thickness of the resin film 4 in this part being thinner than the appropriate numerical range, so it is not preferred. On the other hand, if the atomization pressure is greater than 0.2MPa, the resin composition as a raw material will be excessively sprayed onto the upper surface 5 of the spiral wrap and the corner formed by the side 7 of the spiral wrap and the upper surface 6 of the base plate, resulting in the film thickness of the resin film 4 in this part exceeding the appropriate numerical range or being too thick, so it is not preferred. After spraying the resin composition as a raw material on the vortex body having an anodized film 3 on the surface by a spraying method, it is placed in a heating device and heat treated for 15 minutes to 120 minutes at a temperature of 160°C to 180°C that does not cause deformation of the aluminum material constituting the vortex body, thereby obtaining a vortex body having a resin film 4 on the surface of the anodized film 3.

[0035] The composition of the resin composition used for the spraying method is not particularly limited, but preferably includes a lubricant, a binder resin and a solvent. As a lubricant, fluorine resins such as tetrafluoroethylene (PTFE), molybdenum disulfide, graphite, etc. can be listed. As a solvent, compounds such as N-methyl-2-pyrrolidone (NMP) and 3-methoxy-N, N-dimethylacrylamide (MPA) can be listed. As the main component binder resin, polyimide resins can be listed. Moreover, among the compounds such as NMP and MPA, N-methyl-2-pyrrolidone (NMP) is preferably used from the perspective of the health effects of the user. The resin composition can be prepared, for example, by mixing and stirring a lubricant, a polyimide resin (or a high-concentration polyimide resin varnish prepared by dissolving the polyimide resin in a solvent such as NMP in advance) with N-methyl-2-pyrrolidone (NMP) at room temperature or about 30°C.

[0036] The following is a more detailed description of the invention by showing examples and comparative examples of the invention of the present application. In addition, the technical concept of the invention of the present application should not be limited to the description of the following examples. [Example 1]

[0037] After degreasing and cleaning, the aluminum fixed vortex was placed in a sulfuric acid bath consisting of a 15% sulfuric acid aqueous solution, with the fixed vortex as the anode and carbon (carbon rod) as the cathode, at a bath temperature of 20°C and a current density of 1.0 A / dm 2 The electric current was applied for 4 minutes under the condition of , and a fixed scroll with an anodic oxide film was obtained.

[0038] Afterwards, 30 g of tetrafluoroethylene with an average particle size of 10 μm, 200 g of polyimide resin varnish (polyimide resin is dissolved in N-methyl-2-pyrrolidone as a solvent with a concentration of 30% by mass), and 3 g of graphite are mixed and stirred with 250 mL of N-methyl-2-pyrrolidone (NMP) at room temperature to prepare a resin composition with a tetrafluoroethylene content of 20% by volume. A G05-38 (round nozzle) spray gun manufactured by MESAC Co., Ltd. is used to spray the surface of the fixed scroll with an anodized film at an atomization pressure of 0.1 MPa. It is placed in a heating device (a hot air circulation conveyor furnace manufactured by Fuji Scientific Instruments Co., Ltd.) and heat treated at 180°C for 90 minutes to obtain a fixed scroll with a resin film.

[0039] (Evaluation method) The fixed scroll with resin film obtained by the above method was cut and embedded with resin, and after the surface was mirror-polished, a metal microscope (DSX500 manufactured by Olympus Corporation) was used to measure the average film thickness, arithmetic mean roughness (Ra) and maximum surface roughness (Rz) of the anodized film and the film thickness of the resin film. The results showed that the average film thickness of the anodized film was 0.5μm, the arithmetic mean roughness (Ra) was 0.3μm, and the maximum surface roughness (Rz) was 1.8μm. The results are shown in Table 1. In addition, the average film thickness of the resin film on the upper surface 5 of the spiral wrap in the fixed scroll was 18μm, and the average film thickness of the resin film on the upper surface 6 of the bottom plate was 14μm.

[0040] Afterwards, using the same method as above, a fixed scroll with a resin film was manufactured separately, and combined with an aluminum movable scroll to manufacture a fluid machinery, namely a scroll compressor. In addition, the height of the spiral wrap in the fixed scroll is designed to be lower than the height of the spiral wrap in the movable scroll. The scroll compressor was operated for several hours at a rotation speed of 10,000 rpm and a crimping surface pressure of 6 MPa, and a durability test was performed under a high-speed and high-load environment. After the durability test, the scroll compressor was disassembled, and the appearance of the fixed scroll with a resin film was visually observed. As a result, the resin film did not peel off or wear abnormally, and there was no sintering of the scroll bodies. A photograph of the appearance of the fixed scroll with a resin film after the durability test is shown in FIG. Figure 2 (A). [Example 2]

[0041] This Example 2 differs from Example 1 only in that the anodizing treatment time of the fixed scroll is changed from 4 minutes to 9 minutes. Therefore, the formation method of the anodized film and the resin film of the fixed scroll and the evaluation method thereof are not repeated here. The average film thickness of the anodized film of this Example 2 is 3.0 μm, the arithmetic mean roughness (Ra) is 1.1 μm, and the maximum surface roughness (Rz) is 5.9 μm. In addition, after the durability test, the resin film did not peel off or wear abnormally, and the scroll bodies did not sinter to each other. The evaluation results are shown in Table 1. [Example 3]

[0042] This embodiment 3 differs from embodiment 1 only in that the anodizing treatment time of the fixed scroll is changed from 4 minutes to 15 minutes. Therefore, the formation method of the anodized film and the resin film of the fixed scroll and the evaluation method thereof are not repeated here. The average film thickness of the anodized film of this embodiment 3 is 5.0 μm, the arithmetic mean roughness (Ra) is 1.7 μm, and the maximum surface roughness (Rz) is 8.8 μm. In addition, after the durability test, the resin film did not peel off or wear abnormally, and the scroll body did not experience sintering and other problems. The evaluation results are shown in Table 1. [Example 4]

[0043] This embodiment 4 differs from embodiment 1 only in that the anodizing treatment time of the fixed scroll is changed from 4 minutes to 35 minutes. Therefore, the formation method of the anodized film and the resin film of the fixed scroll and the evaluation method thereof are not repeated here. The average film thickness of the anodized film of this embodiment 4 is 10.0 μm, the arithmetic mean roughness (Ra) is 1.6 μm, and the maximum surface roughness (Rz) is 8.1 μm. In addition, after the durability test, the resin film did not peel off or wear abnormally, and the scroll body did not experience sintering and other problems. The evaluation results are shown in Table 1. [Comparative Example]

[0044] [Comparative Example 1] This comparative example 1 does not perform anodizing treatment on the fixed scroll. Instead, it only performs degreasing and cleaning, and then forms a resin film directly on the surface of the fixed scroll. This is the only difference from Example 1. Therefore, the method for forming the resin film of the fixed scroll and the method for evaluating it are not described in detail. The arithmetic mean roughness (Ra) of the fixed scroll (aluminum substrate) of this comparative example 1 is 0.1 μm, and the maximum surface roughness (Rz) is 0.7 μm. Moreover, in this comparative example 1, the resin film partially peels off after the durability test. The evaluation results and appearance photos are shown in Tables 1 and Figure 2 (B).

[0045] [Table 1]

[0046] <Comparison between Examples and Comparative Examples> From the above results, it can be seen that in the fluid machinery (scroll compressor) of Examples 1 to 4, in which an anodized film with an average film thickness in the range of 0.3μm to 10.0μm is applied to the surface of one of a pair of scroll bodies made of aluminum material and a resin film is provided on the surface of the anodized film, even if the fluid machinery is operated for a long time under high speed and high load conditions, the resin film will not peel off or wear abnormally, and the scroll bodies will not sinter, wear, or breakage.

[0047] On the other hand, in Comparative Example 1, in which a resin film is formed directly on the surface of one of a pair of scroll bodies made of aluminum without forming an anodic oxide film, the resin film is partially peeled off after the fluid machinery is operated for a long time under a high-speed and high-load environment. Therefore, it can be inferred that if the fluid machinery is continued to operate under the above-mentioned durability test conditions, the scroll body may suffer from sintering, wear, breakage and other problems. Possibility of industrial application

[0048] The scroll-type fluid machine involved in this application can be used as a device that sucks in a fluid such as air, water, various refrigerants, or gas or liquid, and compresses or expands its volume using a pair of built-in scroll bodies to discharge it to the outside of the fluid machine. Specifically, it can be used as a power source for various machines, a device for air conditioning systems, etc. In particular, it can be advantageously used in mechanical fields such as the automobile industry, which has strict quality requirements. Explanation of symbols

[0049] 1 Fixed scroll 2 Moving scroll 3. Anodized film 4 Resin film 5 Upper surface of the spiral wrap 6 Upper surface of the base plate 7 Side of the spiral wrap

Claims

1. A scroll type fluid machine, The scroll type fluid machine can compress or expand the fluid in the space formed between a pair of scroll bodies that can rotate relatively. The scroll body is made of aluminum or aluminum alloy, an anodized film having a thickness of 0.3 μm to 10.0 μm is applied to the surface of the scroll body, and a resin film is arranged on the surface of the anodized film.

2. The scroll type fluid machine according to claim 1, wherein: The surface roughness Rz of the anodized film is 1.5 μm to 9.0 μm.

3. The scroll-type fluid machine according to claim 1 or claim 2, wherein: The resin film has a thickness of 5 μm or more.

4. The scroll type fluid machine according to claim 1, wherein: The scroll body comprises a bottom plate and a spiral wrapping piece protruding from the surface of the bottom plate, and the height of the wrapping piece of one scroll body is designed to be lower than that of the wrapping piece of the other scroll body.

5. The scroll type fluid machine according to claim 4, wherein: The anodized film and the resin film are sequentially arranged on the surface of the scroll body where the height of the surround is low.

Images