Scroll compressor

Abstract

[Problem] To provide a scroll compressor capable of suppressing the occurrence of sliding marks. [Solution] A scroll compressor comprising: a first scroll having a first base and a spiral-shaped first wrap erected on the first base; and a second scroll having a second base and a spiral-shaped second wrap erected on the second base, in which the first scroll and the second scroll are arranged such that the first wrap and the second wrap mesh with each other, and are configured such that the volume of a space formed between the first wrap and the second wrap is changeable by the relative orbital revolving motion of the first scroll and the second scroll, wherein at least one of the first scroll and the second scroll has a surface layer including a thick film portion and a thin film portion on a surface including a sliding surface between the first scroll and the second scroll, and at least one of the surface layers is made of resin.

Description

Scroll compressor

[0001] The present invention relates to a scroll compressor. More specifically, the present invention relates to a scroll compressor capable of suppressing the occurrence of sliding marks.

[0002] As shown in Patent Document 1, a scroll compressor includes a scroll unit that compresses a refrigerant. In this scroll unit, a fixed scroll and a movable scroll are installed facing each other. In the same document, by providing a coating film having a specific film thickness on the tip surface of the spiral wrap provided on the fixed scroll and / or the movable scroll, it is attempted to suppress the generation of a gap between the fixed scroll and the movable scroll.

[0003] Japanese Patent Application Laid-Open No. 2010-150966

[0004] However, in conventional technologies including Patent Document 1, there is room for further improvement from the viewpoint of suppressing sliding marks that may occur on the fixed scroll or the movable scroll during the operation of the scroll compressor.

[0005] One object of the present invention is to provide a scroll compressor capable of suppressing the occurrence of sliding marks.

[0006] A scroll compressor according to an embodiment of the present invention includes a first scroll having a first base material and a spiral first wrap erected on the first base material, and a second scroll having a second base material and a spiral second wrap erected on the second base material. The first scroll and the second scroll are arranged such that the first wrap and the second wrap mesh with each other, and the volume of the space formed between the first wrap and the second wrap can be changed by the relative公转 rotation movement of the first scroll and the second scroll. The scroll compressor is characterized in that at least one of the first scroll and the second scroll has a surface layer including a thick film portion and a thin film portion on a surface including a sliding surface between the first scroll and the second scroll, and at least one of the surface layers is composed of resin.

[0007] According to the scroll compressor of this embodiment, clearance can be secured between the first scroll and the second scroll in the thin film portion of the surface layer (and the portion facing the thin film portion) (or the contact pressure can be reduced), and the generation of sliding marks due to the sliding of the first scroll and the second scroll can be suppressed. The thin film portion can be provided in any portion where it is desired to suppress the generation of sliding marks. Furthermore, since at least one of the surface layers is made of resin, the thickness of the surface layer can be set with a high degree of freedom, and the thick film portion and the thin film portion can be molded with high precision.

[0008] More preferably, the surface layer is provided at least on the surface of the first substrate on the second scroll side of the first scroll. This makes it possible to suppress the generation of sliding marks on the surface of the first substrate on the second scroll side.

[0009] More preferably, the surface layer is provided across the surface of the first substrate on the second scroll side and the surface of the first wrap of the first scroll. This suppresses the generation of sliding marks on the surface of the first substrate on the second scroll side and prevents peeling of the surface layer.

[0010] More preferably, the thin film portion of the surface layer is positioned on the center side of the first scroll (the winding start point side of the first wrap). Normally, the winding start point side, i.e., the center side of the first scroll (or second scroll), tends to become hot and high pressure during the operation of the scroll compressor, and is prone to thermal deformation. In contrast, by positioning the thin film portion on this center side, even if thermal deformation occurs, excessive sliding is suppressed, and the generation of sliding marks is suppressed.

[0011] More preferably, the surface layer is provided at least on the surface of the second wrap of the second scroll that is on the first scroll side. This makes it possible to suppress the generation of sliding marks on the surface of the second wrap that is on the first scroll side (the leading edge surface of the second wrap).

[0012] More preferably, the surface layer is provided across the surface of the second scroll on the first scroll side of the second substrate and the surface of the second wrap. This suppresses the generation of sliding marks on the surface of the second wrap on the first scroll side (the leading edge of the second wrap) and prevents peeling of the surface layer.

[0013] More preferably, the thin film portion of the surface layer is positioned on the center side of the second scroll (the winding start point side of the second wrap). Normally, the winding start point side, i.e., the center side of the second scroll (or first scroll), tends to become hot and high pressure during the operation of the scroll compressor, and is prone to thermal deformation. In contrast, by positioning the thin film portion on this center side, even if thermal deformation occurs, excessive sliding is suppressed, and the generation of sliding marks is suppressed.

[0014] More preferably, if one of the first scroll and the second scroll does not have the surface layer including a thick film portion and a thin film portion, the surface including the sliding surface between the first scroll and the second scroll has a uniform surface layer that does not include a thick film portion and a thin film portion. This further suppresses the generation of sliding marks.

[0015] More preferably, the first scroll is a fixed scroll and the second scroll is a movable scroll.

[0016] More preferably, the first scroll is a movable scroll and the second scroll is a fixed scroll.

[0017] More preferably, in at least one of the surface layers, the difference in film thickness between the thick film portion and the thin film portion is 15 to 50 μm. If the difference in film thickness is 15 μm or more, sufficient clearance can be secured (or the contact surface pressure can be sufficiently reduced). If the difference in film thickness is 50 μm or less, leakage of the compressible fluid in the portion where the thin film portion 40 is provided can be sufficiently suppressed.

[0018] Preferably, in at least one of the surface layers, the thick film portion and the thin film portion are connected in a stepped or sloping manner.

[0019] More preferably, at least one of the surface layers has a textured surface. This improves the adhesion of the surface layers.

[0020] According to the present invention, it is possible to provide a scroll compressor that can suppress the generation of sliding marks.

[0021] This is a cross-sectional view of a scroll compressor according to the first embodiment of the present invention, along the front-rear direction. This is a cross-sectional view showing the main parts of the fixed scroll and movable scroll included in the scroll compressor according to the first embodiment of the present invention. This is a plan view of the main parts of the fixed scroll included in the scroll compressor according to the first embodiment of the present invention, as seen from the fixed wrap side. This is a cross-sectional view showing the main parts of the fixed scroll and movable scroll included in the scroll compressor according to the second embodiment of the present invention. This is a plan view of the main parts of the movable scroll included in the scroll compressor according to the second embodiment of the present invention, as seen from the movable wrap side.

[0022] The scroll compressor of the present invention will be described in detail below. In this specification, "x to y" represents a numerical range of "x or more, and y or less". The upper and lower limits described for the numerical range can be combined arbitrarily. Furthermore, it is possible to combine two or more non-conflicting embodiments of the embodiments of the present invention described below, and an embodiment that combines two or more embodiments is also an embodiment of the embodiments of the present invention.

[0023] A scroll compressor according to one aspect of the present invention comprises: a first scroll having a first substrate and a spiral-shaped first wrap erected on the first substrate; and a second scroll having a second substrate and a spiral-shaped second wrap erected on the second substrate, wherein the first scroll and the second scroll are arranged such that the first wrap and the second wrap interlock with each other, and the volume of the space formed between the first wrap and the second wrap can be changed by the relative orbital and rotational motion of the first scroll and the second scroll, wherein at least one of the first scroll and the second scroll has a surface layer including a thick film portion and a thin film portion on a surface including the sliding surface between the first scroll and the second scroll, and at least one of the surface layers is made of resin.

[0024] A scroll compressor according to one aspect of the present invention is characterized in that it has a surface layer including a thick film portion and a thin film portion on the surface including the sliding surface. This ensures clearance between the first scroll and the second scroll in the thin film portion (and the portion facing the thin film portion) (or reduces contact pressure), thereby suppressing the generation of sliding marks caused by the sliding of the first scroll and the second scroll. The thin film portion can be provided in any portion where it is desired to suppress the generation of sliding marks. Furthermore, since at least one of the surface layers is made of resin, the thickness of the surface layer can be set with a high degree of freedom, and the thick film portion and the thin film portion can be molded with high precision.

[0025] Figure 1 is a cross-sectional view of a scroll compressor (hereinafter also simply referred to as "compressor") according to the first embodiment of the present invention, along the front-rear direction. Figure 2 is a cross-sectional view showing the main parts of the fixed scroll and movable scroll of the scroll compressor. Figure 3 is a plan view of the main parts of the fixed scroll of the scroll compressor as seen from the fixed wrap side.

[0026] The compressor 11 is a belt-driven scroll compressor used, for example, in the refrigerant circuit of a car air conditioner. It draws in refrigerant, compresses it, and then discharges it. The compressor 11 is integrated to maintain airtightness by a front housing 12, a center housing 13, and a rear housing 14, which are arranged in order from the front to the rear along the front-to-rear direction. An intake port (not shown) for drawing in refrigerant is formed at the top of the front housing 12, and an exhaust port 16 for discharging the compressed refrigerant is formed at the top of the rear housing 14.

[0027] A rotating shaft 21 is rotatably supported on the front side of the front housing 12. The front end of the rotating shaft 21 is connected to a pulley 23 via an electromagnetic clutch 22. Power from, for example, the engine is transmitted to the pulley 23 via a drive belt.

[0028] A fixed scroll (first scroll) 24 is formed on the rear side of the center housing 13, and a movable scroll (second scroll) 25 is housed from the rear side of the front housing 12 to the front side of the center housing 13.

[0029] The fixed scroll 24 is formed to close the rear side of the center housing 13 and has a disc-shaped fixed base material (first base material) 26 and a spiral-shaped fixed wrap (first wrap) 27 erected on the front surface (the side facing the movable scroll 25) of the fixed base material 26.

[0030] The movable scroll 25 is positioned in front of the fixed base material 26 and has a disc-shaped movable base material (second base material) 28 and a spiral-shaped movable wrap (second wrap) 29 erected on the rear surface of the movable base material 28 (the surface on the fixed scroll 24 side).

[0031] The fixed scroll 24 and the movable scroll 25 are positioned such that the fixed wrap 27 and the movable wrap 29 interlock with each other. In other words, the front surface of the fixed base material 26 and the rear surface of the movable base material 28 face each other, and the fixed wrap 27 and the movable wrap 29 interlock.

[0032] The leading edge of the fixed wrap 27 is close to the rear surface of the movable base material 28. The leading edge of the movable wrap 29 is in slidable contact with the front surface of the fixed base material 26. A pressure chamber 31 for compressing the refrigerant is formed by the space (compartment) enclosed by the front surface of the fixed base material 26, the fixed wrap 27, the rear surface of the movable base material 28, and the movable wrap 29. When viewed from the front or rear, the pressure chamber 31 is a crescent-shaped sealed space.

[0033] A boss 32 is formed on the front surface of the movable base material 28, and an eccentric crank end 33 is formed on the rear end of the rotating shaft 21, with the crank end 33 rotatably fitted into the boss 32. The rotational motion of the rotating shaft 21 is transmitted to the movable scroll 25 as a pivoting motion by the crank end 33. The movable scroll 25 is prevented from rotating on its own axis, for example via a pin and hole, but is allowed to revolve around the fixed scroll 24.

[0034] A discharge hole (not shown) is formed in the center of the fixed base material 26, penetrating in the front-to-back direction, and the discharge hole communicates with a discharge chamber 35 formed on the rear side of the fixed base material 26. A discharge valve 36 that can open and close the rear end of the discharge hole is provided on the rear surface of the fixed base material 26.

[0035] The relative orbital motion of the fixed scroll 24 and the movable scroll 25 allows the volume of the space formed between the fixed wrap 27 and the movable wrap 29 to be changed.

[0036] As the movable scroll 25 revolves and rotates relative to the fixed scroll 24, the space formed between the fixed wrap 27 and the movable wrap 29 (i.e., the pressure chamber 31) is displaced toward the scroll center when viewed from the front-rear direction, and its volume decreases. When the pressure chamber 31 is outside the scroll, it communicates with the intake port (not shown) to draw in refrigerant, and when it is at the center of the scroll, it communicates with the discharge port (not shown) to discharge compressed refrigerant. The discharge valve 36 discharges refrigerant into the discharge chamber 35 when it receives discharge pressure.

[0037] The front housing 12 is provided with an annular thrust plate 37 that is attached to the front housing 12 and makes surface contact with the front surface of the movable base material 28, that is, the back surface of the movable scroll 25, and receives the axial reaction force of the movable scroll 25. When the movable scroll 25 revolves around the fixed scroll 24, the movable base material 28 of the movable scroll 25 also slides against the thrust plate 37.

[0038] The bodies of the fixed scroll 24 and the movable scroll 25 can each be made of metal. The type of metal is not particularly limited, and examples include 6000 series aluminum alloys, i.e., aluminum-magnesium-silicon (Al-Mg-Si) alloys. Here, the bodies of the fixed scroll 24 and the movable scroll 25 are made of A6061-T6. Note that while A4032 has a silicon content of 11.0 to 13.5%, A6061 has a silicon content of 0.4 to 0.8%.

[0039] In this embodiment, as shown in Figure 2, the fixed scroll 24 has a surface layer 38 including a thick film portion 39 and a thin film portion 40 on the surface that includes the sliding surface between the fixed scroll 24 and the movable scroll 25 (here, the surface of the fixed substrate 26 of the fixed scroll 24 on the side of the movable scroll 25). Here, the surface layer 38 is provided across the surface of the fixed substrate 26 of the fixed scroll 24 on the side of the movable scroll 25 and the surface of the fixed wrap 27. The thick film portion 39 and the thin film portion 40 are formed within a common surface (i.e., the surface of the fixed substrate 26 of the fixed scroll 24 on the side of the movable scroll 25, which is the "surface that includes the sliding surface"). From one perspective, the surface layer 38 can also be described as being provided on a surface including the sliding surface between the fixed scroll 24 and the movable scroll 25 (in this case, the surface of the fixed substrate 26 of the fixed scroll 24 on the side of the movable scroll 25), having a thick film portion 39 and a thin film portion 40 on the "surface including the sliding surface", and extending to surfaces other than the "surface including the sliding surface" (in this case, the surface of the fixed wrap 27).

[0040] The surface layer 38 ensures clearance between the fixed scroll 24 and the movable scroll 25 (or reduces contact pressure) in the thin film portion 40 (and the portion of the movable scroll 25 facing the thin film portion 40 (specifically, the tip surface of the movable wrap 29)), thereby suppressing the generation of sliding marks associated with the sliding of the fixed scroll 24 and the movable scroll 25. The thin film portion 40 can be provided in any portion where it is desired to suppress the generation of sliding marks. The thick film portion 39 contacts the portion of the movable scroll 25 facing the thick film portion 39 (specifically, the tip surface of the movable wrap 29), forming a sliding surface.

[0041] Furthermore, because the surface layer 38 extends to surfaces other than the "sliding surface" (in this case, the surface of the fixing wrap 27), it is possible to prevent the peeling of the surface layer 38 compared to the case where it is provided only on the "sliding surface".

[0042] In this embodiment, as shown in Figure 3 in particular, the thin film portion 40 of the surface layer 38 is located on the central side of the fixed scroll 24 (the winding start point side of the spiral-shaped fixed wrap 27, and the B side in the double arrow A-B). The thick film portion 39 of the surface layer 38 is located on the outside of the thin film portion 40 (the A side in the double arrow A-B) when viewed from the central side of the fixed scroll 24. Normally, the winding start point side, i.e., the central side of the fixed scroll 24 (or movable scroll 25), tends to become hot and high pressure during the operation of the compressor 11, and is prone to thermal deformation in the direction of the rotation axis 21 (up and down direction in Figure 2). In this embodiment, since the thin film portion 40 is located on this central side, even if thermal deformation occurs, excessive sliding between the fixed substrate 26 and the movable wrap 29 is suppressed, and the generation of sliding marks is suppressed.

[0043] In the surface layer 38, the thickness of the thick film portion 39 should be greater than that of the thin film portion 40, and it is particularly preferable that the difference in film thickness between the thick film portion 39 and the thin film portion 40 is 15 to 50 μm. If the difference in film thickness is 15 μm or more, sufficient clearance can be secured (or the contact surface pressure can be sufficiently reduced). If the difference in film thickness is 50 μm or less, leakage of the compressible fluid in the portion where the thin film portion 40 is provided can be sufficiently suppressed.

[0044] The film thickness of the thick film portion 39 of the surface layer 38 is preferably 25 to 50 μm. The film thickness of the thin film portion 40 of the surface layer 38 is preferably 10 to 25 μm. Within these ranges, it is preferable to set the film thickness of the thick film portion 39 to be larger than that of the thin film portion 40.

[0045] In the present embodiment, in the surface layer 38, the thick film portion 39 and the thin film portion 40 are connected in a slope shape. That is, from the thick film portion 39 to the thin film portion 40, the film thickness of the surface layer 38 is formed so as to gradually become thinner. However, it is not limited to this example, and in other embodiments, the thick film portion 39 and the thin film portion 40 may be connected in a stepped manner. When the thick film portion 39 and the thin film portion 40 are connected in a stepped manner, the number of steps is not particularly limited, and from the thick film portion 39 to the thin film portion 40, the film thickness of the surface layer 38 can have a stepwise change in one step or multiple steps.

[0046] The base of the surface layer 38 (in this example, the surface on the movable scroll side of the main body of the fixed scroll 24) is preferably matte. Thereby, the adhesion of the surface layer 38 to the main body of the fixed scroll 24 can be improved. The surface roughness (Rz) of this matte surface is preferably 1.5 to 9.0 μm as defined in JIS B / 0601:2013.

[0047] The material of the surface layer 38 is not particularly limited and may be different from the material of the main body of the fixed scroll 24. Examples of the material of the surface layer 38 include, for example, resin, metal, ceramic, cermet, etc., and among them, resin is preferable. When the surface layer 38 is made of resin, the film thickness of the surface layer 38 can be set with a high degree of freedom, and the thick film portion 39 and the thin film portion 40 can be accurately formed.

[0048] When the surface layer 38 is made of resin, the surface layer 38 can contain a lubricant and a binder resin. Examples of the lubricant include fluororesins such as polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFA), and perfluoroethylene fluoropolymer (FEP), and molybdenum disulfide. Among the fluororesins, polytetrafluoroethylene (PTFE) is preferable in terms of heat resistance, durability, etc. Examples of the binder resin include polyamideimide resin, etc. It is preferable to include. The binder resin can be the main component of the surface layer 38 and can be a component for fixing the lubricant. The surface layer 38 may further contain a filler. Examples of the filler include carbon, graphite, etc. Graphite is preferable in terms of ease of handling, etc. Carbon and graphite can be components for further improving the heat resistance and durability of the surface layer 38.

[0049] In the above description, the case where the surface layer 38 including the thick film portion 39 and the thin film portion 40 is provided over the surface on the movable scroll 25 side of the fixed base material 26 of the fixed scroll 24 and the surface of the fixed wrap 27 has been mainly shown, but it is not limited thereto. The surface layer 38 is preferably provided at least on the surface on the movable scroll side of the fixed base material 26 of the fixed scroll 24.

[0050] In the above description, the case where the fixed scroll 24 has the surface layer 38 including the thick film portion 39 and the thin film portion 40 on the surface including the sliding surface between the fixed scroll 24 and the movable scroll 25 (the surface on the movable scroll 25 side of the fixed base material 26) has been mainly shown, but it is not limited thereto. As long as at least one of the fixed scroll 24 and the movable scroll 25 has a surface layer including a thick film portion and a thin film portion on the surface including the sliding surface between the fixed scroll 24 and the movable scroll 25.

[0051] In the second embodiment of the present invention described below, the case where the movable scroll 25 has the surface layer 38 including the thick film portion 39 and the thin film portion 40 on the surface including the sliding surface between the fixed scroll 24 and the movable scroll 25 (the tip surface of the movable wrap 29) will be described.

[0052] Figure 4 is a cross-sectional view showing the main parts of the fixed scroll and movable scroll in a scroll compressor according to a second embodiment of the present invention. Figure 5 is a plan view of the main parts of the movable scroll in the scroll compressor as seen from the movable wrap side. In this embodiment, the basic configuration of the scroll compressor is the same as in the first embodiment, except for the configuration of the fixed scroll and movable scroll. Unless otherwise specified, the same reference numerals in Figures 1-3 refer to the same components in Figures 4 and 5.

[0053] In this embodiment, as shown in Figure 4, the movable scroll 25 has a surface layer 38 including a thick film portion 39 and a thin film portion 40 on a surface that includes the sliding surface between the fixed scroll 24 and the movable scroll 25 (in this case, the leading edge surface of the movable wrap 29 of the movable scroll 25). Here, the surface layer 38 is provided across the surface of the movable substrate 28 of the movable scroll 25 on the fixed scroll 24 side and the surface of the movable wrap 29. The thick film portion 39 and the thin film portion 40 are formed within a common surface (i.e., the leading edge surface of the movable wrap 29 of the movable scroll 25, which is the "surface including the sliding surface"). From one perspective, the surface layer 38 can also be described as being provided on a surface including the sliding surface between the fixed scroll 24 and the movable scroll 25 (in this case, the tip surface of the movable wrap 29 of the movable scroll 25), having a thick film portion 39 and a thin film portion 40 on the "surface including the sliding surface", and extending to surfaces other than the "surface including the sliding surface" (in this case, surfaces other than the tip surface of the movable wrap 29 and the surface of the movable substrate 28 on the fixed scroll 24 side).

[0054] The surface layer 38 ensures clearance between the fixed scroll 24 and the movable scroll 25 in the thin film portion 40 (and the portion of the fixed scroll 24 facing the thin film portion 40 (specifically, the surface of the fixed substrate 26 on the movable scroll side)), thereby reducing the contact pressure and suppressing the generation of sliding marks associated with the sliding of the fixed scroll 24 and the movable scroll 25. The thin film portion 40 can be provided in any portion where it is desired to suppress the generation of sliding marks. The thick film portion 39 contacts the portion of the fixed scroll 24 facing the thick film portion 39 (specifically, the surface of the fixed substrate 26 on the movable scroll side), forming a sliding surface.

[0055] Furthermore, because the surface layer 38 extends to surfaces other than the "sliding surface" (in this case, surfaces other than the tip surface of the movable wrap 29 and the surface on the fixed scroll 24 side of the movable substrate 28), the effect of preventing peeling of the surface layer 38 can be obtained compared to the case where it is provided only on the "sliding surface".

[0056] In this embodiment, as shown in Figure 5 in particular, the thin film portion 40 of the surface layer 38 is located on the central side of the movable scroll 25 (the winding start point side of the spiral-shaped movable wrap 29, and the B side in the double-headed arrow A-B). The thick film portion 39 of the surface layer 38 is located on the outside of the thin film portion 40 (the A side in the double-headed arrow A-B) when viewed from the central side of the movable scroll 25. Normally, the winding start point side, i.e., the central side of the movable scroll 25 (or fixed scroll 24), tends to become hot and high pressure during the operation of the compressor 11, and is prone to thermal deformation in the direction of the rotation axis 21 (up and down direction in Figure 4). In this embodiment, since the thin film portion 40 is located on this central side, even if thermal deformation occurs, excessive sliding between the fixed substrate 26 and the movable wrap 29 is suppressed, and the generation of sliding marks is suppressed.

[0057] In this embodiment, the film thickness (film thickness difference) between the thick film portion 39 and the thin film portion 40, the connection configuration between the thick film portion 39 and the thin film portion 40, the substrate of the surface layer 38, the material of the surface layer 38, etc., will be described by reference to the description of the first embodiment.

[0058] The above description mainly shows the case in which the surface layer 38, which includes a thick film portion 39 and a thin film portion 40, is provided across the surface of the movable substrate 28 of the movable scroll 25 on the fixed scroll 24 side and the surface of the movable wrap 29, but is not limited to this. Preferably, the surface layer 38 is provided at least on the leading edge surface of the movable wrap 29 of the movable scroll 25.

[0059] The first and second embodiments described above show cases where the surface layer, which includes a thick film portion and a thin film portion, is provided on only one of the fixed scroll and the movable scroll, but the invention is not limited thereto. For example, the surface layer may be provided on both the fixed scroll and the movable scroll. In this case, one of the surface layers may be replaced with a surface layer that does not include a thick film portion and a thin film portion (also called a "uniform surface layer" to distinguish it from the "surface layer including a thick film portion and a thin film portion").

[0060] In the first and second embodiments described above, the leading edge of the movable wrap of the movable scroll is shown to slidably contact the surface of the fixed substrate of the fixed scroll on the movable scroll side, forming a sliding surface. However, the embodiment is not limited to this. Although not shown in the figures, for example, the leading edge of the fixed wrap of the fixed scroll may slidably contact the surface of the movable substrate of the movable scroll on the fixed scroll side, forming a sliding surface. In this case, the surface layer configuration for the fixed scroll in the first embodiment can be applied as the surface layer configuration for the movable scroll. Also, the surface layer configuration for the movable scroll in the second embodiment can be applied as the surface layer configuration for the fixed scroll.

[0061] In other words, the scroll compressor only needs to have a surface layer including a thick film portion and a thin film portion on at least one of the first scroll and the second scroll, where the first scroll is a fixed scroll and the second scroll is a movable scroll, or the first scroll is a movable scroll and the second scroll is a fixed scroll.

[0062] The method for manufacturing the scroll compressor according to the present invention is not particularly limited. Two methods (the first method and the second method) are given below as examples of methods for forming the surface layer, but the invention is not limited to these. These methods are particularly suitable when the surface layer is made of resin.

[0063] In the first method, a pre-surface layer (surface layer before processing) is first formed in the area of ​​the fixed scroll where the surface layer is to be formed, and then the pre-surface layer is processed to form a surface layer having thick and thin film portions. For example, the body of the fixed scroll (in a state where the surface layer has not yet been formed) is prepared, and a pre-surface layer (surface layer before processing) is formed on the body of the fixed scroll, spanning the surface on the movable scroll side of the fixed substrate of the fixed scroll and the surface of the fixed wrap. The method of forming the pre-surface layer is not particularly limited, and for example, painting or thermal spraying can be used. Painting can be carried out by spraying, dipping, electrodeposition, etc. Painting is suitable when the surface layer is formed with resin, etc. Thermal spraying is suitable when the surface layer is formed with metal, ceramic, cermet, etc. After forming the pre-surface layer, the pre-surface layer is processed to form a surface layer having thick and thin film portions. The processing method is not particularly limited, and for example, cutting can be used.

[0064] In the second method, a surface layer having a thick film portion and a thin film portion is directly formed in the region of the fixed scroll where the surface layer is to be formed. For example, the main body of the fixed scroll (in a state where the surface layer has not yet been formed) is prepared, and resin is injection molded (insert molded) across the surface of the movable scroll side of the fixed substrate of the fixed scroll and the surface of the fixed wrap to form a surface layer having a thick film portion and a thin film portion.

[0065] The above explanation described the method of forming a surface layer using the example of forming a surface layer on a fixed scroll, but the same method applies when forming a surface layer on a movable scroll.

[0066] The scroll compressor of the present invention can be suitably used, for example, as a belt-driven scroll compressor used in the refrigerant circuit of a car air conditioner.

[0067] 11 Compressor 12 Front housing 13 Center housing 14 Rear housing 16 Discharge port 21 Rotating shaft 22 Electromagnetic clutch 23 Pulley 24 Fixed scroll 25 Movable scroll 26 Fixed base material 27 Fixed lap 28 Movable base material 29 Movable lap 31 Pressure chamber 32 Boss 33 Crank end 35 Discharge chamber 36 Discharge valve 37 Thrust plate 38 Surface layer 39 Thick film section 40 Thin film section

Claims

1. A scroll compressor comprising: a first base material and a first scroll having a spiral-shaped first wrap erected on the first base material; and a second base material and a second scroll having a spiral-shaped second wrap erected on the second base material, wherein the first scroll and the second scroll are arranged such that the first wrap and the second wrap interlock with each other, and the volume of the space formed between the first wrap and the second wrap can be changed by the relative orbital and rotational motion of the first scroll and the second scroll, wherein at least one of the first scroll and the second scroll has a surface layer including a thick film portion and a thin film portion on a surface including the sliding surface between the first scroll and the second scroll, and at least one of the surface layers is made of resin.

2. The scroll compressor according to claim 1, wherein the surface layer is provided at least on the surface of the first substrate of the first scroll that is on the side of the second scroll.

3. The scroll compressor according to claim 2, wherein the surface layer is provided across the surface of the first substrate of the first scroll on the second scroll side and the surface of the first wrap.

4. The scroll compressor according to claim 2 or 3, wherein the thin film portion of the surface layer is located on the central side of the first scroll.

5. The scroll compressor according to claim 1, wherein the surface layer is provided at least on the surface of the second wrap of the second scroll that is on the first scroll side.

6. The scroll compressor according to claim 5, wherein the surface layer is provided across the surface of the second substrate of the second scroll on the first scroll side and the surface of the second wrap.

7. The scroll compressor according to claim 5 or 6, wherein the thin film portion of the surface layer is located on the central side of the second scroll.

8. The scroll compressor according to claim 1 or 2, wherein, when one of the first scroll and the second scroll does not have the surface layer including a thick film portion and a thin film portion, the surface including the sliding surface between the first scroll and the second scroll has a uniform surface layer that does not include a thick film portion and a thin film portion.

9. The scroll compressor according to claim 1 or 2, wherein the first scroll is a fixed scroll and the second scroll is a movable scroll.

10. The scroll compressor according to claim 1 or 2, wherein the first scroll is a movable scroll and the second scroll is a fixed scroll.

11. The scroll compressor according to claim 1 or 2, wherein in at least one of the surface layers, the difference in film thickness between the thick film portion and the thin film portion is 15 to 50 μm.

12. The scroll compressor according to claim 1 or 2, wherein in at least one of the surface layers, the thick film portion and the thin film portion are connected in a stepped or sloping manner.

13. The scroll compressor according to claim 1 or 2, wherein the substrate of at least one of the surface layers is a matte finish with a surface roughness (Rz) of 1.5 to 9.0 μm as defined in JIS B / 0601:2013.

Images