Scroll compressor

Abstract

The invention provides a scroll compressor which improves durability of each scroll plate. A scroll compressor (1) is provided with a fixed scroll (50) and an orbiting scroll (60) that are made of an aluminum-based material. A first plating film layer (C1) formed by tin plating is formed on a compression chamber-side end surface (51a) of a substrate (51) of one scroll plate (30A) and a surface of a scroll wall (52), and a second plating film layer (C2) formed by nickel-phosphorus plating is formed on a compression chamber-side end surface (61a) of a substrate (61) of the other scroll plate (30B) and a surface of a scroll wall (62). The wall height (h2) of the scroll wall (62) of the other scroll plate (30B) is set to be higher than the wall height (h1) of the scroll wall (52) of the one scroll plate (30A), and the first coating layer (C1) at the front end of the scroll wall (52) of the one scroll plate (30A) and the second coating layer (C2) of the base plate (61) of the other scroll plate (30B) are separated from each other. The first coating layer (C1) of the base plate (51) of one scroll plate (30A) and the second coating layer (C2) of the front end of the scroll wall (62) of the other scroll plate (30B) are in contact with each other.

Description

Technical Field

[0001] The present invention relates to a scroll compressor used in a vehicle air conditioner or the like. Background Art

[0002] The scroll compressor disclosed in Patent Document 1 is configured to include a fixed scroll and an orbiting scroll which are arranged in a mutually meshing manner and each have a base plate and a vortex wall erected on the base plate, and the fluid taken into a compression chamber formed between the fixed scroll and the orbiting scroll is compressed by causing the orbiting scroll to revolve relative to the fixed scroll. In the scroll compressor disclosed in Patent Document 1, in order to reduce weight, the fixed scroll and the orbiting scroll are formed of an aluminum-based material, and a coating layer formed by nickel-phosphorus plating is formed on the surface of the base plate and the vortex wall of the orbiting scroll. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent No. 2941680 Summary of the invention Technical Problems to be Solved by the Invention

[0004] However, in the scroll compressor disclosed in Patent Document 1, the fixed scroll is not plated, and the aluminum material is exposed on the surface of the fixed scroll. Therefore, there is a possibility that the plating layer formed by nickel-phosphorus plating at the front end of the scroll wall of the rotating scroll directly slides against the aluminum material of the substrate of the fixed scroll. In addition, since the mutual solubility of the nickel component and the aluminum component is relatively high, in the scroll compressor disclosed in Patent Document 1, for example, there is a possibility that the front end of the scroll wall of the rotating scroll is bonded to the substrate of the fixed scroll containing the aluminum component through the plating layer containing the nickel component, and there is room for improvement in terms of durability.

[0005] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a scroll compressor having a structure capable of reducing the weight of each scroll and improving durability. Technical solutions for solving technical problems

[0006] According to one aspect of the present invention, a scroll compressor is provided, which is configured to include a fixed scroll and a rotating scroll arranged in a mutually meshing manner and each having a base plate and a scroll wall vertically arranged on the base plate, and the rotating scroll is caused to revolve relative to the fixed scroll to compress a fluid taken into a compression chamber formed between the fixed scroll and the rotating scroll. In the scroll compressor, the fixed scroll and the rotating scroll are respectively made of aluminum-based materials, and a first plating layer formed by tin plating is formed on the compression chamber side end surface of the base plate of one of the fixed scroll and the rotating scroll and the surface of the scroll wall of the one scroll, and a second plating layer formed by nickel-phosphorus plating is formed on the compression chamber side end surface of the base plate of the other of the fixed scroll and the rotating scroll and the surface of the scroll wall of the other scroll. The wall height of the vortex wall of the vortex disk on the other side is set to be higher than the wall height of the vortex wall of the vortex disk on one side, the first coating layer at the front end of the vortex wall of the vortex disk on one side and the second coating layer of the substrate of the vortex disk on the other side are separated from each other, and the first coating layer of the substrate of the vortex disk on one side and the second coating layer at the front end of the vortex wall of the vortex disk on the other side are in contact with each other. Effects of the Invention

[0007] According to the present invention, it is possible to provide a scroll compressor having a structure capable of reducing the weight of each scroll and improving durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a cross-sectional view of a scroll compressor according to an embodiment of the present invention. Figure 2 This is an enlarged cross-sectional view of a main part for explaining a main part of a scroll compressor. Figure 3 It is an enlarged cross-sectional view of a compressor of a comparative example. Figure 4 It is an enlarged cross-sectional view of a compressor of another comparative example. Figure 5 This is an enlarged cross-sectional view of a main part for explaining a modified example of the scroll compressor. DETAILED DESCRIPTION

[0009] Embodiments of the present invention will be described below with reference to the drawings.

[0010] Figure 1The scroll compressor 1 is a cross-sectional view showing a schematic structure of a scroll compressor 1 according to an embodiment of the present invention. The scroll compressor 1 is configured to be built into a refrigerant circuit of a vehicle air conditioning device, etc., and receives low-pressure gas refrigerant from the refrigerant circuit and compresses it, and returns it to the refrigerant circuit after increasing its pressure. Figure 1 1 and 2 show an example of the front-rear direction and the upper-lower direction in the use state of the scroll compressor 1. The gas refrigerant is an example of the fluid of the present invention.

[0011] The scroll compressor 1 includes a housing 10, a rotating shaft 20a, an electric motor 20 for rotating the rotating shaft 20a, a scroll unit 30 driven by the rotating shaft 20a and compressing a (low-pressure) gas refrigerant, and an inverter 40 for driving and controlling the electric motor 20. The main components (10, 20a, 30, 40) are accommodated inside the housing 10. The scroll unit 30 includes a fixed scroll 50 and an orbiting scroll 60. The fixed scroll 50 and the orbiting scroll 60 are arranged opposite to each other in the direction of the central axis of the scroll compressor 1 and meshed with each other.

[0012] The housing 10 includes a front housing 11, a cover member 12, a center housing 13, and a rear housing 14. The housing 10 of the scroll compressor 1 is configured by fastening these (11, 12, 13, 14) by fasteners (not shown).

[0013] The front housing 11 has a cylindrical first peripheral wall portion 111 and a first partition wall portion 112 that divides the interior of the first peripheral wall portion 111 into a front and rear portion. The interior space of the first peripheral wall portion 111 is divided into a front inverter accommodation space and a rear motor accommodation space by the first partition wall portion 112. A support portion 113 that supports the front end portion of the rotating shaft 20a is provided on the first partition wall portion 112, and the support portion 113 supports the front end portion of the rotating shaft 20a through a first bearing 114 so that the front end portion can rotate freely.

[0014] The cover member 12 is joined to the front end surface of the front housing 11 . This closes the inverter housing space. The front end surface of the center housing 13 is joined to the rear end surface of the front housing 11 .

[0015] The center housing 13 has a cylindrical second peripheral wall portion 131 and a second partition wall portion 132 that divides the interior of the second peripheral wall portion 131 into front and rear. The interior space of the second peripheral wall portion 131 is divided into a front connection space connected to the motor accommodation space and a rear scroll accommodation space by the second partition wall portion 132. The second partition wall portion 132 has a hollow protrusion 132a that protrudes toward the front housing 11 side. A rotating shaft insertion hole 132b is formed in the hollow protrusion 132a. The hollow protrusion 132a supports the rear end side of the rotating shaft 20a through the second bearing 133 so that it can rotate freely.

[0016] The rear housing 14 is joined to the rear end surface of the center housing 13. For example, a recess 134 is formed on the rear end surface of the center housing 13 (the second peripheral wall portion 131). The outer edge of the fixed scroll 50 is clamped by the center housing 13 and the rear housing 14, and the rear opening of the second peripheral wall portion 131 is closed by the fixed scroll 50. The rear housing 14 has a cylindrical third peripheral wall portion 141 and a bottom wall portion 142 that closes the rear opening of the third peripheral wall portion 141. The front opening of the third peripheral wall portion 141 is closed by the fixed scroll 50 by joining the front end surface of the third peripheral wall portion 141 to the rear end surface of the second peripheral wall portion 131.

[0017] The electric motor 20 is constituted by, for example, a three-phase AC motor, and includes a stator core unit 21 and a rotor 22. The stator core unit 21 is fixed to the inner peripheral surface of the first peripheral wall portion 111 of the front housing 11. A DC current from a vehicle-mounted battery (not shown) or the like is converted into an AC current by an inverter 40 and supplied to the stator core unit 21. The rotor 22 is arranged with a predetermined gap on the radial inner side of the stator core unit 21. The rotor 22 is formed in a cylindrical shape and is fixed to the rotating shaft 20a in a state where the rotating shaft 20a is inserted into the hollow portion thereof. The rotor 22 is integrated with the rotating shaft 20a.

[0018] When the electric motor 20 generates a magnetic field in the stator core unit 21 by power supply from the inverter 40 , a rotational force acts on a permanent magnet built into the rotor 22 , and the rotor 22 rotates, thereby rotating the rotary shaft 20 a .

[0019] As described above, the scroll unit 30 includes a fixed scroll 50 and an orbiting scroll 60 that revolves and rotates relative to the fixed scroll 50. The fixed scroll 50 and the orbiting scroll 60 are arranged in a mutually meshing manner, and each has a base plate (51, 61) and a spiral scroll wall (52, 62) vertically arranged on the base plate (51, 61). The fixed scroll 50 and the orbiting scroll 60 are respectively made of aluminum-based materials. Specifically, aluminum alloy is used as the material of each scroll (50, 60), thereby achieving lightweighting of the scroll unit 30.

[0020] Specifically, the fixed scroll 50 has a disc-shaped substrate 51 (hereinafter appropriately referred to as the fixed substrate 51), and a spiral scroll wall 52 (hereinafter appropriately referred to as the fixed scroll wall 52) vertically arranged on the compression chamber side end surface 51a of the fixed substrate 51. The rotating scroll 60 has a disc-shaped substrate 61 (hereinafter appropriately referred to as the rotating substrate 61), and a scroll wall 62 (hereinafter appropriately referred to as the rotating scroll wall 62) vertically arranged on the compression chamber side end surface 61a of the rotating substrate 61. The rotating scroll 60 is configured in a manner that the rotating scroll wall 62 meshes with the fixed scroll wall 52 of the fixed scroll 50. The rotating scroll 60 is configured to be driven by the rotating shaft 20a through the crank mechanism 70, and to revolve and rotate relative to the fixed scroll 50.

[0021] The crank mechanism 70 is configured to connect the rotating shaft 20a with the rotating scroll 60, and convert the rotational motion of the rotating shaft 20a into the orbital rotational motion of the rotating scroll 60. The crank mechanism 70 includes a crank pin 71 vertically arranged at the rear end of the rotating shaft 20a, an eccentric bushing 72 installed in an eccentric state relative to the crank pin 71, and a cylindrical portion 73 protruding from the back of the rotating base plate 61 of the rotating scroll 60. The eccentric bushing 72 is rotatably supported on the inner circumferential surface of the cylindrical portion 73 by a bearing omitted from the figure. In addition, a balancing weight 74 is installed at the rear end of the rotating shaft 20a.

[0022] The rotation of the rotating scroll 60 can be prevented by the rotation prevention mechanism 80. A plurality of rotation prevention portions consisting of rings 81 and pins 82 are arranged at equal intervals along the circumferential direction near the outer peripheral edge of the back side of the rotating base plate 61 to form the rotation prevention mechanism 80. The ring 81 is pressed into a circular hole formed in the back side 61b of the rotating base plate 61, which is the surface opposite to the compression chamber side end surface 61a, and the pin 82 is protrudingly provided in the second partition wall portion 132 of the center housing 13, penetrates the thrust plate 90, and is loosely fitted inside the ring 81.

[0023] The scroll unit 30 is configured to take in and compress low-pressure gas refrigerant by the orbiting rotational motion of the orbiting scroll 60 relative to the fixed scroll 50. A thrust plate 90 in the form of an annular plate is arranged between the rotating base plate 61 of the orbiting scroll 60 and the second partition wall portion 132 of the center housing 13, and the rear side surface of the second partition wall portion 132 receives the thrust from the orbiting scroll 60 through the thrust plate 90.

[0024] Here, the scroll compressor 1 includes: a suction chamber H1, into which low-pressure gas refrigerant flows; a compression chamber H2, which compresses the low-pressure gas refrigerant; a discharge chamber H3, into which the gas refrigerant compressed in the compression chamber H2 is discharged; a gas-liquid separation chamber H4, which separates lubricating oil from the gas refrigerant compressed in the compression chamber H2; and a back pressure chamber H5, which is arranged on the back side of the rotating scroll 60 (the back side of the rotating substrate 61).

[0025] The suction chamber H1 is formed by dividing the front housing 11 (the first peripheral wall portion 111, the first partition wall portion 112) and the center housing 13 (the second peripheral wall portion 131, the second partition wall portion 132). The suction port P1 formed in the first peripheral wall portion 111 is connected to the refrigerant circuit (the low-pressure side) through a connecting pipe or the like not shown in the figure. Therefore, the low-pressure refrigerant from the refrigerant circuit flows into the suction chamber H1 through the suction port P1. In addition, a refrigerant channel L1 is formed in the center housing 13 for guiding the low-pressure gas refrigerant in the suction chamber H1 to the space H6 near the outer end of the scroll unit 30.

[0026] The compression chamber H2 is formed between the fixed scroll 50 and the orbiting scroll 60. The scroll unit 30 is configured to take in low-pressure gas refrigerant from the space H6 when the compression chamber H2 is formed, thereby compressing the low-pressure gas refrigerant. The scroll compressor 1 is configured to compress the gas refrigerant (fluid) taken into the compression chamber H2 formed between the fixed scroll 50 and the orbiting scroll 60 by causing the orbiting scroll 60 to revolve relative to the fixed scroll 50.

[0027] The discharge chamber H3 is formed by the rear housing 14 (third peripheral wall portion 141, bottom wall portion 142) and the fixed scroll 50 (fixed base plate 51). The gas refrigerant compressed in the compression chamber H2 is discharged to the discharge chamber H3 through the discharge hole L2 formed in the radial center of the fixed base plate 51. A check valve V, such as a reed valve, is installed on the surface 51b of the fixed base plate 51 of the fixed scroll 50 on the opposite side of the compression chamber side end surface 51a, allowing the gas refrigerant to flow from the compression chamber H2 to the discharge chamber H3, but restricting the gas refrigerant from flowing from the discharge chamber H3 to the compression chamber H2.

[0028] The gas-liquid separation chamber H4 is provided in the rear housing 14. A centrifugal separation type oil separator OS is provided in the gas-liquid separation chamber H4, for example. A discharge port P2 provided at an upper portion than the oil separator OS is connected to the refrigerant circuit (the high-pressure side) through a connecting pipe or the like not shown in the figure. The gas refrigerant (high-pressure gas refrigerant) in the discharge chamber H3 flows into the gas-liquid separation chamber H4 through the connecting hole L3 formed in the bottom wall portion 142 of the rear housing 14, and the lubricating oil contained in the gas refrigerant is separated by the oil separator OS, and then guided to the high-pressure side of the refrigerant circuit from the discharge port P2. On the other hand, the lubricating oil separated from the high-pressure gas refrigerant by the oil separator OS is guided to the lower portion of the gas-liquid separation chamber H4 due to gravity.

[0029] The back pressure chamber H5 is formed between the rotating substrate 61 and the second partition wall 132. In the present embodiment, the back pressure chamber H5 includes the internal space of the hollow protrusion 132a of the second partition wall 132. A lubricating oil passage L4 connecting the back pressure chamber H5 and the gas-liquid separation chamber H4 is formed in the center housing 13, the fixed substrate 51 and the rear housing 14. A throttle hole (throttle part) OL is arranged on the lubricating oil passage L4. In the gas-liquid separation chamber H4, the lubricating oil separated by the oil separator OS is supplied to the back pressure chamber H5 through the lubricating oil passage L4 in a state where it is decompressed through the throttle hole OL. The back pressure chamber H5 can be connected to the compression chamber H2 through a through hole 611 formed in the rotating substrate 61 and capable of functioning as a throttle part. Therefore, the flow rate of the fluid (lubricating oil and / or gas refrigerant) traveling between the back pressure chamber H5 and the compression chamber H2 is limited by the through hole 611. As a result, the pressure in the back pressure chamber H5 is maintained at an intermediate pressure (back pressure) between the pressure in the suction chamber H1 and the pressure in the discharge chamber H3, and the orbiting scroll 60 is pressed toward the fixed scroll 50 by the intermediate pressure (back pressure). That is, the back pressure chamber H5 causes the back pressure (back pressure load) that presses the orbiting scroll 60 toward the fixed scroll 50 to act on the orbiting scroll 60.

[0030] Here, in order to improve the durability of the scroll disk unit 30, it is possible to consider tin plating (hereinafter appropriately referred to as Sn plating) and nickel-phosphorus plating (hereinafter appropriately referred to as Ni-P plating) on ​​the scroll disk unit 30. The Sn plating has excellent lubricity and good adaptability to other materials, and it is easy to increase the limit surface pressure (specifically, the surface pressure at which the material adheres when sliding relative to the other material at a specified sliding speed). In addition, in general, the construction cost of Sn plating is lower than that of Ni-P plating. However, compared with Ni-P plating, Sn plating is not only easy to wear, but also easy to peel off from the plating construction surface. In addition, Sn plating has poor heat resistance compared to Ni-P plating. Therefore, if the same part of the Sn plating slides continuously for a long time, the Sn plating disappears from the plating construction surface due to wear and peeling, and there is a possibility that the plating construction surface is exposed. Moreover, Ni-P plating has excellent heat resistance compared to Sn plating. However, the mutual solubility of nickel and aluminum is relatively high. The inventors of the present invention focused on the high mutual solubility of nickel and aluminum, and noticed that direct contact between the Ni—P plating layer and the aluminum material of the scroll unit 30 is not a good sliding state.

[0031] The scroll compressor 1 of the present embodiment has the following structure as a structure for reducing the weight of the scroll unit 30 and improving the durability of the scroll unit 30 .

[0032] Figure 2 This is an enlarged cross-sectional view of a main part for explaining a main part of the scroll compressor 1.

[0033] In the scroll unit 30 of the scroll compressor 1 of the present embodiment, a first plating film layer C1 formed by tin plating is formed on the compression chamber side end surface (51a or 61a) of the substrate (51 or 61) of the scroll 30A of one of the fixed scroll 50 and the orbiting scroll 60 and the surface of the scroll wall (52 or 62) of the one scroll 30A. The first plating film layer C1 (in other words, Sn plating layer) has a first layer thickness t1 as a predetermined plating thickness, and the plating construction site of the one scroll 30A is covered with the first plating film layer C1 (Sn plating layer) having the first layer thickness t1 formed by, for example, electroless Sn.

[0034] Furthermore, a second plating layer C2 formed by nickel-phosphorus plating is formed on the compression chamber side end surface (61a or 51a) of the substrate (61 or 51) of the other scroll 30B of the fixed scroll 50 and the rotating scroll 60 and on the surface of the scroll wall (62 or 52) of the other scroll 30B. The second plating layer C2 (in other words, the Ni-P plating layer) has a second layer thickness t2 as a predetermined plating thickness, and the plating construction site of the other scroll 30B is covered by the second plating layer C2 (Ni-P plating layer) having the second layer thickness t2.

[0035] That is, in the scroll unit 30 , the compression chamber side end surface 51 a and the fixed scroll wall 52 of the fixed base plate 51 of the fixed scroll 50 and the compression chamber side end surface 61 a and the orbiting scroll wall 62 of the orbiting base plate 61 of the orbiting scroll 60 are plated.

[0036] In the present embodiment, the plating construction area of ​​the orbiting scroll 60 is smaller than the plating construction area of ​​the fixed scroll 50. Specifically, the orbiting substrate 61 of the orbiting scroll 60 has an outer shape smaller than the outer shape of the fixed substrate 51 of the fixed scroll 50. Moreover, the plating construction area of ​​the orbiting scroll 60 obtained by adding the surface area of ​​the compression chamber side end surface 61a of the orbiting substrate 61 and the surface area of ​​the orbiting scroll wall 62 is smaller than the plating construction area of ​​the fixed scroll 50 obtained by adding the surface area of ​​the compression chamber side end surface 51a of the fixed substrate 51 and the surface area of ​​the fixed scroll wall 52.

[0037] In the present embodiment, the scroll 30A on one side, which is the object of formation of the first plating layer C1 by tin plating, is the fixed scroll 50, and the scroll 30B on the other side, which is the object of formation of the second plating layer C2 by nickel-phosphorus plating, is the orbiting scroll 60. That is, the scroll 30A on one side, which is the object of formation of the first plating layer C1 by tin plating, is the fixed scroll 50, and the scroll 30B on the other side, which is the object of formation of the second plating layer C2 by nickel-phosphorus plating, is the orbiting scroll 60.

[0038] Therefore, in the present embodiment, the first plating layer C1 formed by tin plating is formed on the compression chamber side end surface 51a of the fixed base plate 51 and the surface of the fixed scroll wall 52 in the fixed scroll 50 of the scroll 30A as one side. In other words, in the present embodiment, the first plating layer C1 (Sn plating layer) is formed on the fixed scroll 50 having a relatively large (wide) plating construction area among the fixed scroll 50 and the orbiting scroll 60.

[0039] Moreover, in the present embodiment, the second plating layer C2 formed by nickel-phosphorus plating is formed on the compression chamber side end surface 61a of the rotating base plate 61 and the surface of the rotating scroll wall 62 in the rotating scroll 60 of the other scroll 30B. In other words, in the present embodiment, the second plating layer C2 (Ni-P plating layer) is formed on the rotating scroll 60 having a relatively small (narrow) plating construction area among the fixed scroll 50 and the rotating scroll 60.

[0040] If reference Figure 2, the wall height h2 of the vortex wall (the rotating vortex wall 62 in this embodiment) of the other scroll 30B is set to be higher than the wall height h1 of the vortex wall (the fixed vortex wall 52 in this embodiment) of the scroll 30A on one side. Specifically, the wall height h2 of the rotating vortex wall 62 is the distance from the compression chamber side end face 61a of the rotating substrate 61 to the front end face of the rotating vortex wall 62, and the wall height h1 of the fixed vortex wall 52 is the distance from the compression chamber side end face 51a of the fixed substrate 51 to the front end face of the fixed vortex wall 52.

[0041] Moreover, the first plating layer C1 (Sn plating) at the front end of the vortex wall (fixed vortex wall 52) of the scroll disk 30A on one side and the second plating layer C2 (Ni-P plating) of the substrate (rotating substrate 61) of the scroll disk 30B on the other side are separated from each other, while the first plating layer C1 (Sn plating) of the substrate (fixed substrate 51) of the scroll disk 30A on one side and the second plating layer C2 (Ni-P plating) at the front end of the vortex wall (rotating vortex wall 62) of the scroll disk 30B on the other side are in contact with each other. Therefore, during the operation of the scroll disk, the first plating layer C1 (Sn plating) at the front end of the vortex wall of the scroll disk 30A on one side and the second plating layer C2 (Ni-P plating) of the substrate of the scroll disk 30B on the other side opposite thereto are always separated. On the other hand, the second plating layer C2 (Ni—P plating layer) at the tip of the scroll wall of the other scroll 30B slides against the first plating layer C1 (Sn plating layer) of the substrate of the one scroll 30A.

[0042] Next, the effects of the scroll compressor 1 of the present embodiment will be described by comparison with a scroll-type comparative compressor of a comparative example. Figure 3 as well as Figure 4 They are used for Figure 2 1 is an enlarged cross-sectional view of a scroll type comparative compressor ( 1 ′, 1 ″) for comparison with the scroll compressor 1 of the present embodiment shown in FIG. Figure 3 is an enlarged cross-sectional view of a scroll unit 30 of a comparative compressor 1' of a comparative example, Figure 4 It is an enlarged cross-sectional view of a scroll unit 30 of a comparative compressor 1 ″ of another comparative example.

[0043] If reference Figure 3, in the comparative compressor 1' of the comparative example, a second nickel-phosphorus plating layer C2 is formed on the compression chamber side end surface 61a of the rotating substrate 61 of the rotating scroll 60 and the surface of the rotating scroll wall 62, but the fixed scroll 50 is not plated. In addition, the front end of the fixed scroll wall 52 of the fixed scroll 50 exposed by the aluminum material (raw material) contacts the second plating layer C2 (Ni-P plating layer) formed on the compression chamber side end surface 61a of the rotating substrate 61. Therefore, in the comparative compressor 1' of the comparative example, during the scroll operation, the front end of the rotating scroll wall 62 directly contacts and slides with the compression chamber side end surface 51a of the fixed substrate 51 of the exposed fixed scroll 50 containing aluminum components through the second plating layer C2 containing nickel components. Furthermore, since the mutual solubility of the nickel component and the aluminum component is high, in the comparative compressor 1', a large friction heat is generated at the sliding portion between the front end (the surface of the second plating layer C2) of the orbiting scroll wall 62 of the orbiting scroll 60 and the compression chamber side end surface 51a of the fixed base plate 51 of the fixed scroll 50, and there is a possibility that the temperature of the sliding portion rises excessively. In this case, in the comparative compressor 1', there is a possibility that the front end of the orbiting scroll wall 62 of the orbiting scroll 60 is bonded to the compression chamber side end surface 51a of the fixed base plate 51 containing the aluminum component of the exposed fixed scroll 50 through the second plating layer C2 containing the nickel component. Similarly, in the comparative compressor 1', there is a possibility that the front end of the exposed fixed scroll wall 52 containing the aluminum component of the fixed scroll 50 is bonded to the compression chamber side end surface 61a of the orbiting base plate 61 of the orbiting scroll 60 through the second plating layer C2 containing the nickel component. That is, in the comparative compressor 1 ′, the second plating layer C2 (Ni—P plating layer) containing a nickel component applied to the orbiting scroll 60 slides in direct contact with the exposed aluminum material (aluminum raw material) of the fixed scroll 50 , so there is a possibility that the two scrolls ( 50 , 60 ) may adhere to each other.

[0044] In contrast, in the scroll compressor 1 of the present embodiment, a first plating layer C1 formed by tin plating is formed on the compression chamber side end surface of the substrate of the scroll plate 30A on one side and the surface of the scroll wall, and a second plating layer C2 formed by nickel-phosphorus plating is formed on the compression chamber side end surface of the substrate of the scroll plate 30B on the other side and the surface of the scroll wall. Therefore, in the scroll compressor 1, the second plating layer C2 (Ni-P plating layer) containing a nickel component applied to the other scroll plate 30B is prevented from sliding in a state of contacting with the aluminum material (aluminum raw material) of the scroll plate 30A on one side.

[0045] If reference Figure 4In the comparison compressor 1" of other comparison examples, a second nickel-phosphorus plating layer C2 is formed on the surface of the compression chamber side end surface 61a of the rotating substrate 61 of the rotating scroll 60 and the surface of the rotating scroll wall 62, and a first plating layer C1 formed by tin plating is formed on the compression chamber side end surface 51a of the fixed substrate 51 of the fixed scroll 50 and the surface of the fixed scroll wall 52. Moreover, in the comparison compressor 1", the first plating layer C1 (Sn plating) of the compression chamber side end surface 51a of the fixed substrate 51 of the fixed scroll 50 and the second plating layer C2 (Ni-P plating) at the front end of the rotating scroll wall 62 of the rotating scroll 60 are in contact with each other. In these respects, the structure of the comparative compressor 1" is common to the structure of the scroll compressor 1 of the present embodiment. However, in the comparative compressor 1", the first plating layer C1 (Sn plating layer) at the front end of the fixed scroll wall 52 of the fixed scroll 50 and the second plating layer C2 (Ni-P plating layer) on the compression chamber side end surface 61a of the rotating substrate 61 of the rotating scroll 60 are in contact with each other.

[0046] Here, in the comparative compressor 1", the wall height of the fixed scroll wall 52 of the fixed scroll 50 is the same as the wall height of the rotating scroll wall 62 of the rotating scroll 60. Moreover, in the scroll operation of the comparative compressor 1", a temperature rise caused by frictional heat is generated in the following contact pair A and contact pair B, respectively. The contact pair A is a sliding portion of a first plating layer C1 (Sn plating) at the front end of the fixed scroll wall 52 of the fixed scroll 50 and a second plating layer C1 (Ni-P plating) at the compression chamber side end surface 61a of the rotating substrate 61 of the rotating scroll 60, and the contact pair B is a sliding portion of a first plating layer C1 (Sn plating) at the compression chamber side end surface 51a of the fixed substrate 51 of the fixed scroll 50 and a second plating layer C2 (Ni-P plating) at the front end of the rotating scroll wall 62 of the rotating scroll 60.

[0047] As described above, Sn plating is not only easy to wear but also easy to peel off from the plated surface compared with Ni-P plating. Therefore, the inventors of the present invention have studied in detail the sliding condition of the first plating layer C1 (Sn plating) in the contact pair A and the contact pair B of the comparative compressor 1".

[0048] In the comparative compressor 1", in the contact pair B, during the scroll operation, the first plating layer C1 (Sn plating layer) of the compression chamber side end surface 51a of the fixed substrate 51 of the fixed scroll 50 intermittently (discontinuously) slides relative to the second plating layer C2 due to the orbital rotation of the orbiting scroll 60. Therefore, in the intermittent (discontinuous) sliding, the possibility of wear and peeling of the first plating layer C1 (Sn plating layer) of the compression chamber side end surface 51a of the fixed substrate 51 of the contact pair B is low, and the first plating layer C1 (Sn plating layer) is likely to remain.

[0049] However, in the comparative compressor 1", in the contact pair A, during the scroll operation, the first plating layer C1 (Sn plating layer) at the front end of the fixed scroll wall 52 of the fixed scroll 50 continuously (always) slides relative to the second plating layer C2. Therefore, in the contact pair A, there is a possibility that the first plating layer C1 (Sn plating layer) at the front end of the fixed scroll wall 52 of the fixed scroll 50 disappears from the front end of the fixed scroll wall 52 due to wear and peeling, so that the aluminum-based material (aluminum raw material) is exposed at the front end surface of the fixed scroll wall 52. As a result, if the fixed scroll wall 52 is If the fixed scroll wall 52 is stretched due to thermal expansion, there is a possibility that a large friction force is generated between the aluminum material exposed at the front end surface of the fixed scroll wall 52 and the surface of the second plating layer C2 (Ni-P plating layer) of the compression chamber side end surface 61a of the rotating substrate 61, so that their temperatures rise excessively. In this case, in the comparative compressor 1", in the contact pair A, there is a possibility that the front end of the fixed scroll wall 52 containing aluminum components of the exposed fixed scroll plate 50 is bonded to the compression chamber side end surface 61a of the rotating substrate 61 of the rotating scroll plate 60 through the second plating layer C2 containing nickel components.

[0050] In contrast, in the scroll compressor 1 of the present embodiment, the first plating layer C1 (Sn plating layer) at the front end of the scroll wall of the scroll disk 30A on one side of the pair A1, which is equivalent to the contact pair A, and the second plating layer C2 of the substrate of the scroll disk 30B on the other side are separated from each other. Therefore, in the scroll compressor 1, the wear and peeling of the first plating layer C1 (Sn plating layer) at the front end of the scroll wall of the scroll disk 30A on one side are prevented. As a result, in the scroll compressor 1, the front end of the scroll wall of the scroll disk 30A on one side and the second plating layer C2 of the compression chamber side end surface of the substrate of the scroll disk 30B on the other side are reliably prevented from adhering, thereby achieving improved durability.

[0051] Moreover, in the scroll compressor 1, a gap is formed between the first coating layer C1 (Sn coating) at the front end of the scroll wall of the scroll disk 30A on one side and the second coating layer C2 of the substrate of the scroll disk 30B on the other side, and the first coating layer C1 (Sn coating) on ​​the compression chamber side end surface of the substrate of the scroll disk 30A on one side and the second coating layer C2 at the front end of the scroll wall of the scroll disk 30B on the other side preferentially contact each other. As a result, in the scroll compressor 1, the pressing force in the pair A1 corresponding to the contact pair A (the first plating layer C1 (Sn plating layer) at the front end of the scroll wall of the scroll disk 30A on one side and the second plating layer C2 of the substrate of the scroll disk 30B on the other side) is reduced compared with the pressing force in the compressor 1" of the comparative example, and the pressing force in the pair B1 corresponding to the contact pair B (the first plating layer C1 (Sn plating layer) at the compression chamber side end surface of the substrate of the scroll disk 30A on one side and the second plating layer C2 at the front end of the scroll wall of the scroll disk 30B on the other side) is increased compared with the pressing force in the compressor 1" of the comparative example. The pressing force of the pair B1 corresponding to the contact pair B of the scroll compressor 1 is increased, but the first plating layer C1 (Sn plating layer) at the compression chamber side end surface of the substrate of one scroll disk 30A of the pair B1 slides intermittently relative to the second plating layer C2. Therefore, the first plating layer C1 (Sn plating layer) of the pair B1 is likely to remain and has a high limiting surface pressure.

[0052] In addition, in the present embodiment, the scroll compressor 1 is configured to take the gas refrigerant into the compression chamber H2 together with the lubricating oil, and an oil film M composed of the lubricating oil is formed in the gap between the first plating layer C1 at the front end of the scroll wall of the scroll plate 30A on one side and the second plating layer C2 of the substrate of the scroll plate 30B on the other side. As a result, the airtightness of the compression chamber H2 is easily ensured, and the wear resistance and adhesion resistance are improved. As a result, the life of the Sn plating layer (first plating layer C1) is extended, and the durability is more effectively improved.

[0053] As described above, in the scroll compressor 1 of the present embodiment, the scroll unit 30 is made lighter by using aluminum materials as the raw materials of the fixed scroll 50 and the orbiting scroll 60. Furthermore, as described above, the scroll compressor 1 has a structure that can improve durability compared to the past.

[0054] In the present embodiment, the plating construction area of ​​the rotating scroll 60 is smaller than the plating construction area of ​​the fixed scroll 50, and the other scroll 30B formed with the second plating layer C2 formed by nickel-phosphorus plating (Ni-P plating) is the rotating scroll 60. As a result, the Ni-P plating layer with high plating construction cost per unit construction area is formed on the rotating scroll 60 with a small (narrow) plating construction area. As a result, the plating construction cost is lower than the plating construction cost in the case where the second plating layer C2 (Ni-P plating layer) is formed on the fixed scroll 50, achieving a reduction in manufacturing cost.

[0055] In addition, in the present embodiment, the other scroll 30B to be plated with nickel-phosphorus is the orbiting scroll 60, but the present invention is not limited thereto. Figure 5 As shown, the other scroll 30B to be plated with nickel-phosphorus may be the fixed scroll 50 .

[0056] Specifically, if you refer to Figure 5 , in the scroll unit 30 of the scroll compressor 1 of the modified example, the other scroll 30B formed with the second plating layer C2 formed by nickel-phosphorus plating is the fixed scroll 50, and the one scroll 30A formed with the first plating layer C1 formed by tin plating (Sn plating) is the orbiting scroll 60. In this case, if referring to Figure 5 , a first plating layer C1 formed by tin plating is formed on the compression chamber side end surface 61a of the rotating substrate 61 of the rotating scroll 60 and the surface of the rotating scroll wall 62, and a second plating layer C2 formed by nickel-phosphorus plating is formed on the compression chamber side end surface 51a of the fixed substrate 51 of the fixed scroll 50 and the surface of the fixed scroll wall 52, and the wall height h2 of the fixed scroll wall 52 of the fixed scroll 50 of the scroll 30B on the other side formed with the nickel-phosphorus plating (Ni-P plating) is set to be higher than the wall height h1 of the rotating scroll wall 62 of the rotating scroll 60 of the scroll 30A on the one side formed with the tin plating. Furthermore, if referring to Figure 5 , the first coating layer C1 at the front end of the rotating scroll wall 62 of the rotating scroll 60 and the second coating layer C2 of the fixed base plate 51 of the fixed scroll 50 are separated from each other, and the first coating layer C1 of the rotating base plate 61 of the rotating scroll 60 and the second coating layer C2 at the front end of the fixed scroll wall 52 of the fixed scroll 50 are in contact with each other. Even in the scroll compressor 1 of this modified example, the scroll unit 30 is lightweight and the durability is improved.

[0057] The description of the present embodiment is an example for explaining the present invention and does not limit the invention described in the claims. In addition, the configuration of each part of the present invention is not limited to the above-mentioned embodiment, and various modifications can be made within the technical scope described in the claims. Description of Reference Numerals

[0058] 1 scroll compressor, 50 Fixed scroll, 51 fixed base plate (base plate), 51a Compression chamber side end surface, 52 Fixed vortex wall (vortex wall), 60 Rotating scroll, 61 rotating substrate (substrate), 61a Compression chamber side end surface, 62 Rotating vortex wall (vortex wall), 30A one side scroll, 30B The other scroll, C1 first coating layer, C2 second coating layer, h1 wall height (the wall height of the scroll wall of the one scroll), h2 wall height (the wall height of the scroll wall of the other scroll), H2 compression chamber.

Claims

1. A scroll compressor, characterized in that: The scroll compressor includes a fixed scroll and an orbiting scroll which are arranged in a meshing manner and each have a base plate and a scroll wall erected on the base plate, and the orbiting scroll is caused to revolve relative to the fixed scroll to compress a fluid taken into a compression chamber formed between the fixed scroll and the orbiting scroll. The fixed scroll and the orbiting scroll are respectively made of aluminum-based materials. A first plating layer formed by tin plating is formed on a compression chamber side end surface of the base plate of one of the fixed scroll and the orbiting scroll and on a surface of the scroll wall of the one scroll, A second plating layer formed by nickel-phosphorus plating is formed on a compression chamber side end surface of the substrate of the other scroll of the fixed scroll and the orbiting scroll and on a surface of the scroll wall of the other scroll. The wall height of the spiral wall of the other spiral scroll is set higher than the wall height of the spiral wall of the one spiral scroll. The first plating layer at the front end of the scroll wall of the one scroll and the second plating layer on the substrate of the other scroll are separated from each other. The first plating film layer of the substrate of the one scroll and the second plating film layer at the front end of the scroll wall of the other scroll are in contact with each other.

2. The scroll compressor according to claim 1, characterized in that: The plating construction area of ​​the rotating scroll is smaller than the plating construction area of ​​the fixed scroll. The other scroll on which the second plating layer formed by the nickel-phosphorus plating is formed is the orbiting scroll.

3. The scroll compressor according to claim 1 or 2, characterized in that: The fluid is a gas refrigerant, The gas refrigerant is taken into the compression chamber together with lubricating oil, and an oil film composed of the lubricating oil is formed in a gap between the first plating layer at the front end of the scroll wall of the one scroll and the second plating layer of the substrate of the other scroll.

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