JP4452035B2 - Scroll compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scroll compressor used in a cooling device such as an air conditioner or a refrigerator.
[0002]
[Prior art]
Conventionally, there are reciprocating type, rotary type and scroll type as hermetic compressors for refrigerating and air-conditioning, and any type has been used in the field of refrigerating and air-conditioning for home use and business use. Currently, developments that take advantage of each feature in terms of cost and performance are being carried out.
Among them, a compressor in which a compression mechanism and an electric mechanism are housed in a container is represented by a so-called hermetic compressor intended for soundproofing and maintenance-free, and a scroll compressor and a rotary compressor are mainly used. In general, a scroll compressor forms a compression chamber between the fixed scroll part and the orbiting scroll part where the spiral wrap rises from the end plate, and forms a compression chamber between the two parts. , The suction chamber performs suction, compression, and discharge by moving while changing the volume, and a predetermined back pressure is applied to the outer periphery of the orbiting scroll part and the back of the spiral wrap with lubricating oil. Thus, the orbiting scroll component is prevented from falling over from the fixed scroll component.
The conventional scroll compressor is shown in FIG. 8 (for example, Patent Document 1). FIG. 8 is a sectional view of a conventional scroll compressor.
The refrigerant gas sucked from the suction pipe 1 passes through the suction chamber 3 of the fixed scroll component 2 composed of the spiral wrap 2a and the end plate 2b, and is engaged with the orbiting scroll component 4 composed of the spiral wrap 4a and the end plate 4b. And is compressed while decreasing in volume toward the center of the fixed scroll component 2 and discharged from the discharge port 6.
The back pressure space 8a formed by being surrounded by the orbiting scroll component 4 and the sliding partition ring 14 mounted in the ring-shaped groove of the bearing member 7 is set to an intermediate pressure between the discharge pressure and the suction pressure. The intermediate pressure is controlled by the back pressure adjusting mechanism 9 to be a constant pressure. Note that the sliding partition ring 14 slides with the end plate back surface portion 4 c of the orbiting scroll component 4.
The back pressure adjusting mechanism 9 is provided with a valve 11 in a passage 10 communicating from the back pressure space 8a through the inside of the fixed scroll component 2 to the suction chamber 3, and the pressure of the back pressure space 8a is set. When the pressure becomes higher than the pressure, the valve 11 is opened, and the oil in the back pressure space 8a is supplied to the suction chamber 3, and the back pressure space 8a is maintained at a constant intermediate pressure. The oil supplied to the suction chamber 3 moves to the compression chamber 5 along with the swiveling motion, and serves to prevent leakage between the compression chambers 5. The intermediate force described above is applied to the back surface of the orbiting scroll component 4 to suppress overturning during operation. If it is overturned, the fixed scroll component 2 and the orbiting scroll component 4 are separated from each other, and leakage occurs at that portion.
The fixed scroll component 2 and the orbiting scroll component 4 constituting the scroll compressor are both made of iron based mainly on cast iron, or the fixed scroll component 2 is iron and the orbiting scroll component 4 is aluminum. There is a thing using.
Moreover, in the scroll compressor of patent document 2, the height dimension from the tooth bottom of the end plate to the tooth tip is determined based on the result of measuring the temperature distribution of the tooth tip surface of the orbiting scroll component or the fixed spiral wrap. Adjust and form a thrust direction gap that is the largest on the innermost circumference between the tooth tip of each spiral wrap and the bottom of the other end plate in the assembled state, or change the thrust direction gap in multiple steps. ing.
[0003]
[Patent Document 1]
JP 2001-280252 A [Patent Document 2]
JP-A-7-197891
[Problems to be solved by the invention]
However, when carbon dioxide is used as the refrigerant, the discharge pressure of the compressor is about 7 to 10 times or more higher on the high-pressure side than the conventional compressor using chlorofluorocarbon as the refrigerant. For this reason, if the orbiting scroll component is applied with a back pressure sufficient to prevent it from being separated from the fixed scroll component, the orbiting scroll component is strongly pressed against the fixed scroll component, causing abnormal wear and seizure of the sliding part, resulting in increased input. The performance will be reduced. Also, in a system with a large capacity and multiple refrigerants, during transient operation where the return of the liquid refrigerant is severe, carbon dioxide liquid refrigerant with high washability causes running out of lubricating oil and temperature rise on the thrust surface of the orbiting scroll part. As a result, the aluminum surface may be the starting point and cause seizure.
In addition, when both scroll parts are formed using metals and iron-based materials having the same thermal expansion coefficient, the centrifugal gravity during operation increases because the specific gravity of the orbiting scroll parts increases, resulting in a bearing member. Load increases and sliding loss increases. In particular, the centrifugal force becomes very large during high-speed operation, so that the main shaft and the bearing member are severely worn. In addition, in order to increase the accuracy of the spiral wrap, it is necessary to precisely machine the mounting surface and sliding surface. However, since ferrous materials have low machinability, they are extremely difficult to process and improve productivity. It was difficult.
In addition, each compression chamber generates compression heat by performing a compression action, and this heat causes each scroll component to have a high temperature. The pressure in each compression chamber increases sequentially from the outermost circumferential compression chamber toward the central pressure chamber, and a temperature gradient is generated in each spiral wrap from the outermost circumferential side toward the central side. That is, the compression chamber on the center side (innermost circumferential side) is hotter than the compression chamber on the outermost circumferential side. Due to this temperature rise, each spiral wrap thermally expands, and the inner peripheral side of each spiral wrap located on the center side where the temperature is particularly high greatly expands greatly. For this reason, at the time of thermal expansion of each spiral wrap, the thrust direction gap between the tooth tip surface of each spiral wrap and the tooth bottom of each mirror plate becomes smaller than the gap size at the time of assembly, and the tooth tip surface of each spiral wrap is Contact with the bottom of the tooth. When the contact surface pressure is further increased, galling occurs, each end plate and each spiral wrap may be damaged, and there is a problem that compression efficiency and durability as a compressor are lowered. In particular, when an iron-based material is used for the fixed scroll part, an aluminum-based material is used for the orbiting scroll part, and a metal having a different coefficient of thermal expansion is used, this problem appears remarkably.
Further, in order to avoid performance degradation due to the presence of the thrust direction gap, when a tip seal is provided on either or both of the orbiting scroll component and the fixed scroll component, an increase in sliding loss due to contact of the tip seal or However, there is a problem that productivity is lowered due to an increase in the number of parts and an increase in processing steps.
[0005]
The present invention solves such a conventional problem, and an object of the present invention is to provide a scroll compressor having high efficiency and high reliability when carbon dioxide is used as a refrigerant.
[0006]
[Means for Solving the Problems]
The scroll compressor according to the first aspect of the present invention forms a compression chamber by meshing a fixed scroll part having a fixed spiral wrap on a fixed end plate and a rotary scroll part having a swirl spiral wrap on the rotary end plate, The rotation of the orbiting scroll component is constrained by the rotation restricting component , a back pressure space is provided on the back surface of the orbiting scroll component, and the orbiting scroll component is pressed against the fixed scroll component by the high pressure of the back pressure space. Is a scroll compressor that moves the compression chamber toward the center of the spiral while reducing the volume, sucks and compresses refrigerant gas into the compression chamber,
Using carbon dioxide as the refrigerant, the fixed scroll part of an iron-based metallic material, the orbiting scroll part formed of aluminum-based metal material, forming a cured layer by facilities to surface treatment in addition to the tooth tip of the orbiting spiral wrap and, Rutotomoni is opposed not through the inclusion of the tip seal or the like addendum not subjected to the surface treatment to a fixed end plate of the fixed scroll part, wherein the fixed scroll wrap of the tooth tip is the orbiting scroll part of the fixed scroll part It is characterized by facing the hardened surface layer of the tooth bottom .
According to a second aspect of the present invention, in the scroll compressor according to the first aspect, the thrust direction gap between the tooth bottom of the swivel end plate and the tooth tip of the fixed spiral wrap is from the outer peripheral side to the inner peripheral side. The tooth bottom of the swivel mirror plate is inclined so as to increase.
According to a third aspect of the present invention, in the scroll compressor according to the first or second aspect, any one of an alumite film treatment, a PVD treatment, and a nickel phosphorus plating treatment is performed as the surface treatment. And
According to a fourth aspect of the present invention, in the scroll compressor according to any one of the first to third aspects, the surface-treated portion is subjected to lapping, buffing, or barrel polishing. Features.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The scroll compressor according to the first embodiment of the present invention forms a compression chamber by meshing a fixed scroll component having a fixed spiral wrap on a fixed end plate and a rotary scroll component having a swirl spiral wrap on the rotary end plate. In addition, the rotation of the orbiting scroll part is restricted by the rotation restricting part, and a back pressure space is provided on the back of the orbiting scroll part, and the orbiting scroll part is turned while pressing the orbiting scroll part against the fixed scroll part by the high pressure of the back pressure space. This is a scroll compressor that moves the compression chamber toward the center of the spiral while reducing the volume, sucks and compresses the refrigerant gas into the compression chamber , and uses carbon dioxide as the refrigerant to fix the fixed scroll component. an iron-based metallic material, the orbiting scroll part formed of aluminum-based metallic material, turning spiral Tsu and facilities to surface treatment in addition to the tooth tip of the flop to form a hardened layer, is opposed not through the inclusion of the tip seal or the like addendum not subjected to the surface treatment to a fixed end plate of the fixed scroll part Rutotomoni, The tooth tip of the fixed scroll wrap of the fixed scroll component is opposed to the surface hardened layer of the bottom of the orbiting scroll component . According to the present embodiment, it is possible to prevent the contact of the tooth tip at the center portion of the spiral wrap in the orbiting scroll component against high-temperature compression heat generated at the center portion in the compression process. Also, even if the tooth tip at the center of the spiral wrap contacts, the tooth tip is not surface-treated, so there is no seizure during operation, and there is no seizure between the tooth tip of the fixed scroll part and the tooth bottom of the fixed end plate. Since the thrust direction gap is adjusted, it is possible to achieve both improvement in the performance and reliability of the compressor without processing, thereby reducing the cost.
The second embodiment of the present invention is the scroll compressor according to the first embodiment, wherein the thrust direction gap between the bottom of the swivel end plate and the tip of the fixed spiral wrap is from the outer peripheral side to the inner peripheral side. The tooth bottom of the swivel end plate is inclined so as to increase toward the top. According to the present embodiment, under high differential pressure operation using carbon dioxide as the refrigerant, the fixed scroll component contacts the tooth tip of the swivel end plate due to pressure strain or temperature strain, and the tip of the spiral wrap of the fixed scroll component contacts And high reliability is achieved.
In the scroll compressor according to the first or second embodiment, the third embodiment of the present invention is any one of alumite film treatment, PVD treatment, and nickel phosphorus plating treatment as a surface treatment. is there. According to this embodiment, even under a high differential pressure of carbon dioxide refrigerant, there is little abrasion of the coating with a hardened layer due to sliding, and the surface treatment coating remains even after long-term use, and high reliability without seizure Is planned.
In the fourth embodiment of the present invention, in the scroll compressor according to the first to third embodiments, the surface-treated portion is subjected to lapping, buffing, or barrel polishing. . According to the present embodiment, by reducing the roughness due to the surface treatment, it is possible to improve the performance by reducing the sliding loss, and in particular, it is possible to improve the efficiency from the initial operation.
[0008]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
1 is a cross-sectional view showing a scroll compressor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of the scroll compressor, FIG. 3 is a plan view of orbiting scroll parts used in the scroll compressor, and FIG. FIG. 5 is a graph showing the height ratio of the orbiting scroll wrap of the orbiting scroll component. In addition, about the structure of the same function as the conventional scroll compressor shown in FIG. 8, the same code | symbol is attached | subjected.
The scroll compressor according to this embodiment includes a compression mechanism unit and an electric mechanism unit in the sealed container 20. The compression mechanism is disposed above the sealed container 20, and the electric mechanism is disposed below the compression mechanism. A suction pipe 1 and a discharge pipe 21 are provided on the top of the sealed container 20. An oil reservoir 29 for storing lubricating oil is provided in the lower part of the sealed container 20.
[0009]
The compression mechanism portion includes a fixed scroll component 2 and a turning scroll component 4, and both components mesh with each other to form a plurality of compression chambers 5. That is, the fixed scroll component 2 is configured by a spiral fixed spiral wrap 2a (hereinafter referred to as a spiral wrap 2a) rising from a fixed mirror plate 2b (hereinafter referred to as a mirror plate 2b). A spiral swirl spiral wrap 4a (hereinafter referred to as spiral wrap 4a) rises from the end plate 4b). The compression chamber 5 is formed by engaging the spiral wrap 2a and the spiral wrap 4a between the end plate 2b and the end plate 4b.
The orbiting scroll component 4 is constrained to rotate by the rotation restraining mechanism 22 and revolves along a circular orbit. The compression chamber 5 moves while changing the volume by the orbiting operation of the orbiting scroll component 4.
A back pressure space 8 is provided in the end plate back surface portion 4 c of the orbiting scroll component 4. In this back pressure space 8, a sliding partition ring 14 is arranged in an annular groove provided in the bearing member 7, and the back pressure space 8 is divided into two by this sliding partition ring 14. A high discharge pressure is applied to one inner region 8 b divided by the sliding partition ring 14. A predetermined intermediate pressure between the suction pressure and the discharge pressure is applied to the outer region 8a. A thrust force is applied to the orbiting scroll member 4 by the pressure in the back pressure space 8 and it is stably pressed against the fixed scroll 2 to reduce leakage and stably perform circular orbit movement.
[0010]
In the scroll compressor of this embodiment, the fixed scroll component 2 is formed of an iron-based metal material, the orbiting scroll component 4 is formed of an aluminum-based metal material, the surface treatment is performed on the orbiting scroll component 4, and a hardened layer is formed. Yes. As the surface treatment, any one of alumite film treatment, PVD treatment, and nickel phosphorus plating treatment is performed.
Further, the orbiting scroll component 4 is subjected to lapping, buffing, or barrel polishing after the surface treatment. By reducing the roughness due to the surface treatment by lapping, buffing, or barrel polishing, the frictional resistance is reduced, and the reliability of the sliding surface of the orbiting scroll part 4 is improved and the sliding loss is reduced. By doing so, performance can be improved, and in particular, high efficiency can be achieved from the initial operation.
With the above configuration, when carbon dioxide is used as the refrigerant, the discharge pressure of the compressor is about 7 to 10 times higher than the high-pressure side pressure of the conventional refrigeration cycle using chlorofluorocarbon as the refrigerant, and the orbiting scroll component 4 is fixedly scrolled. When a back pressure that does not separate from the component 2 is applied, the orbiting scroll component 4 is strongly pressed against the fixed scroll component 2, but reliability is maintained without seizure due to the hardened layer formed by the surface treatment applied to the orbiting scroll component 4. High scroll compressor. Also, in a system with a large capacity and a large number of refrigerants, a severe liquid return to the scroll compressor occurs during transient operations such as starting and defrosting, and this liquid return causes the lubricating oil to be washed with the liquid refrigerant, resulting in severe lubrication. However, it is not seized by the hardened layer by this surface treatment, and high speed operation is possible.
[0011]
In the orbiting scroll component 4, the gap in the thrust direction between the tooth tip of the orbiting spiral wrap 4a and the bottom of the fixed end plate 2b of the fixed scroll component 2 increases from the outer peripheral side A to the inner peripheral side B in the normal temperature state. In order to do so, an inclination is provided at the tooth tip of the swirl spiral wrap 4a.
The inclination ratio of the tooth tip of the swirl spiral wrap 4a will be described with reference to FIG.
FIG. 5 shows the tooth tip height of the orbiting spiral wrap 4a of the orbiting scroll part 4 after high load operation. FIG. 5 shows the ratio of the height of the swirl spiral wrap 4a at each position when the height of the swirl spiral wrap 4a on the outer peripheral side A is 100.
The orbiting scroll component 4 becomes hot as it reaches the center due to compression heat generated in the compression process, and is deformed by thermal expansion and deformed by high differential pressure. Therefore, in order to prevent the tooth tip of the swirl scroll wrap 4a of the orbiting scroll 4 from coming into contact with the tooth bottom of the fixed end plate 2b of the fixed scroll 2, the tooth tip of the swirl spiral wrap 4a is inclined so that the inner peripheral side has the minimum height. Is provided. In addition, if the minimum tooth tip height of the swirl spiral wrap 4a is 99.6% or less of the maximum tooth tip height, leakage from the tooth tip increases and performance is degraded. Therefore, it is preferable that the minimum tooth tip height of the swirl spiral wrap 4a on the inner peripheral side is 99.6% or more and less than 100% of the maximum tooth tip height in the swirl spiral wrap 4a on the outer peripheral side.
[0012]
FIG. 6 is a cross-sectional view of a main part showing a scroll compressor according to another embodiment of the present invention. In addition, since it is the same structure as the said Example except the tooth bottom 4b of the turning scroll component 4, description is abbreviate | omitted.
In this embodiment, the thrust direction gap between the tooth bottom of the orbiting end plate 4b of the orbiting scroll component 4 and the tooth tip of the fixed spiral wrap 2a of the fixed scroll component 2 increases from the outer peripheral side to the inner peripheral side. In addition, the tooth bottom of the orbiting end plate 4b of the orbiting scroll component 4 is provided with an inclination. With this configuration, the fixed scroll component 2 is locally applied to the tooth bottom of the orbiting end plate 4b of the orbiting scroll 4 due to pressure or temperature distortion of the fixed scroll component 2 under high differential pressure operation when carbon dioxide is used as the refrigerant. Therefore, high reliability can be achieved.
In the above embodiment, the case where the inclination is provided at the tooth tip of the swirl spiral wrap 4a and the case where the inclination is provided at the tooth bottom of the swivel end plate 4b have been described in different embodiments. Further, an inclination may be provided on the tooth bottom of the swivel end plate 4b.
[0013]
FIG. 7 is a cross-sectional view showing a main part of a scroll compressor according to another embodiment of the present invention.
In the present embodiment, the surface of the orbiting scroll 4 other than the tooth tip 4a is subjected to surface treatment without providing an inclination to the tooth tip of the orbiting spiral wrap 4a and the tooth bottom of the orbiting mirror plate 4b.
According to the present embodiment, even when thermal expansion due to compression heat in the center of the compression process or pressure deformation due to high differential pressure occurs, seizure occurs because the surface treatment with the hardened layer is not applied to the tooth tip. Absent. Then, by the operation for a predetermined time, the orbiting scroll component 4 is worn due to wear so as to fit the thrust direction gap between the tooth tip of the fixed spiral wrap 2a of the fixed scroll component 2 and the tooth bottom of the fixed end plate 2b of the fixed scroll component 2. Since the adjustment is made, the performance of the compressor can be improved and the reliability can be achieved without performing the process of inclining the tooth tip of the orbiting spiral wrap 4a of the orbiting scroll component 4 in advance, so that the cost can be reduced.
In addition, it cannot be overemphasized that the same effect is acquired even if it provides an inclination in the tooth bottom of the fixed end plate 2b instead of providing an inclination in the tooth tip of the swirl spiral wrap 4a.
Further, it goes without saying that the same effect can be obtained by providing an inclination at the tooth tip of the fixed spiral wrap 2a instead of providing an inclination at the tooth bottom of the swivel end plate 4b.
[0014]
【The invention's effect】
As is clear from the above embodiment, the present invention is such that the fixed scroll part is made of an iron-based metal material, the orbiting scroll part is made of an aluminum-based metal material, the orbiting scroll part is subjected to surface treatment, and the tooth tip of the orbiting spiral wrap is obtained. The difference in height using carbon dioxide as a refrigerant is achieved by inclining the tip of the swirl spiral wrap so that the thrust gap between the outer edge and the root of the fixed end plate increases from the outer circumference to the inner circumference. In the pressure operation, even if the tooth bottom of the swivel end plate is strongly pressed against the tooth tip of the fixed spiral wrap, the surface treatment with the hardened layer suppresses abnormal wear and can be operated without causing seizure.
Further, according to the present invention, even during transient operation in which the return of the liquid refrigerant in a system with a large capacity and a large number of refrigerants is severe, there is a lack of lubricating oil on the thrust surface of the orbiting scroll component due to the carbon dioxide liquid refrigerant having high cleaning properties. Operation is possible without causing seizure due to temperature rise.
Further, according to the present invention, since the orbiting scroll part is formed of an aluminum-based material, the centrifugal force of the drive unit during high-speed operation can be reduced, and the durability is excellent and the sliding loss can be reduced.
Further, according to the present invention, the fixed scroll component is made of an iron-based metal material and the orbiting scroll component is formed of an aluminum-based metal material, and surface treatment is applied to a portion other than the tooth tip of the swirl spiral wrap. By applying a surface treatment and making the tooth tip not subjected to the surface treatment face the fixed end plate of the fixed scroll part without inclusions such as tip seals, the high temperature compression heat generated in the center during the compression process In contrast, the contact of the tooth tip at the center of the spiral wrap in the orbiting scroll component can be prevented. Also, even if the tooth tip at the center of the spiral wrap contacts, the tooth tip is not surface-treated, so there is no seizure during operation, and there is no seizure between the tooth tip of the fixed scroll part and the tooth bottom of the fixed end plate. Since the thrust direction gap is adjusted, it is possible to achieve both improvement in the performance and reliability of the compressor without processing, thereby reducing the cost.
In addition, the present invention is such that the tooth bottom of the swivel mirror plate is inclined so that the thrust direction gap between the tooth bottom of the swivel mirror plate and the tooth tip of the fixed spiral wrap increases from the outer peripheral side to the inner peripheral side. Under the high differential pressure operation using carbon dioxide as the refrigerant, the fixed scroll component prevents the tip of the spiral wrap of the fixed scroll component from coming into contact with the tooth bottom of the swivel end plate due to pressure strain and temperature strain. Reliability is achieved.
In addition, the present invention provides a surface treatment with alumite film treatment, PVD treatment, and nickel phosphorus plating treatment, so that the coating having a hardened layer by sliding is worn even under a high differential pressure of carbon dioxide refrigerant. The surface-treated film remains even after a long period of use, and high reliability is achieved without seizure.
In addition, the present invention improves the performance by reducing the sliding loss by reducing the roughness due to the surface treatment by performing lapping, buffing, or barrel polishing on the surface-treated portion. In particular, high efficiency can be achieved from the initial operation.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a scroll compressor according to an embodiment of the present invention. FIG. 2 is a sectional view of the main part of the scroll compressor. FIG. 3 is a plan view of orbiting scroll parts used in the scroll compressor. 4] Side view of the orbiting scroll component [Fig. 5] Graph showing the height ratio of the orbiting spiral wrap of the orbiting scroll component [Fig. 6] Cross-sectional view of the main part showing a scroll compressor according to another embodiment of the present invention [ 7 is a cross-sectional view of a main part showing a scroll compressor according to another embodiment of the present invention. FIG. 8 is a vertical cross-sectional view showing a conventional scroll compressor.
2 Fixed scroll component 2a Fixed end plate 4 Orbiting scroll component 4a Orbiting end plate 4b Orbiting spiral wrap 5 Compression chamber

Claims (4)

A fixed scroll part having a fixed spiral wrap on a fixed end plate, by engaging the orbiting scroll part having a pivot spiral wrap on the orbiting end plate compression chamber formed, restrained by rotation restraining part the rotation of the orbiting scroll part In addition, a back pressure space is provided on the back surface of the orbiting scroll component, and the orbiting scroll component is swirled while pressing the orbiting scroll component against the fixed scroll component due to the high pressure of the back pressure space. A scroll compressor that moves while reducing the volume toward the center and sucks and compresses refrigerant gas into the compression chamber,
Use carbon dioxide as refrigerant,
The fixed scroll component is made of an iron-based metal material, and the orbiting scroll component is formed of an aluminum-based metal material,
The orbiting provide Reinforced surface treatment in addition to the addendum of the spiral wrap to form a cured layer, Ru is opposed not through the inclusion of such tip seal addendum not subjected to the surface treatment to a fixed end plate of the fixed scroll part The scroll compressor is characterized in that a tooth tip of the fixed spiral wrap of the fixed scroll part is opposed to a hardened surface layer of a tooth bottom of the orbiting scroll part .   The tooth bottom of the swivel mirror plate is inclined so that the thrust direction gap between the tooth bottom of the swivel mirror plate and the tooth tip of the fixed spiral wrap increases from the outer peripheral side to the inner peripheral side. The scroll compressor according to claim 1.   The scroll compressor according to claim 1 or 2, wherein any one of an alumite film treatment, a PVD treatment, and a nickel phosphorus plating treatment is performed as the surface treatment.   The scroll compressor according to any one of claims 1 to 3, wherein a lapping process, a buff process, or a barrel polishing process is performed on the surface-treated portion.

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