scroll compressor

Abstract

A first part (251) and a second part (252) are provided on the left and right sides relative to the first axis (27) passing through the center of the first Euler groove (215) of the main frame (2), and the first part (251) and the second part (252) have lower rigidity against bending moment generated by a compressive load applied in the radial direction than other components of the main frame (2), and are arranged so as to straddle the second axis (26) relative to the second axis (26) which is a straight line perpendicular to the first axis (27) and passing through the center of the main frame (2).

Description

Technical Field

[0001] The present application relates to scroll compressors. Background Art

[0002] Among existing scroll compressors, some include a stator fixed to the center of a housing; a main frame fixed to the upper portion of the housing; and a sub-frame fixed to the lower portion of the housing. The compressor also includes a crankshaft supported by bearings fixed to the sub-frame and the main frame; a rotor fixed to the crankshaft; an oscillating scroll mounted to an eccentric portion at the front end of the crankshaft; and a fixed scroll positioned opposite the oscillating scroll and fixed to the housing. The crankshaft rotates due to the power of the stator and rotor, causing the oscillating scroll to oscillate relative to the fixed scroll, compressing the refrigerant in the compression chamber formed by the oscillating scroll and the fixed scroll (see Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2018 / 078787 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] In the scroll compressor described in the above-mentioned patent document 1, when the main frame is fixed to the second inner wall surface of the main shell by shrink fit, a load is applied to the outermost contact surface of the main frame. As a result, stress is generated in the main frame, and the main frame is deformed. Depending on the position of the suction port set on the main frame, the stress distribution is biased, causing the flat surface of the main frame to deform and the flatness of the flat surface to deteriorate. Along with this, there is a problem that the swinging scroll supported on the flat surface of the main frame tilts, and the parallelism and right angles of the vortex bodies of the swinging scroll and the fixed scroll are deteriorated, making it impossible to assemble the tooth tip clearance with high precision. Therefore, there is a problem that the performance of the compressor deteriorates due to the increase in sliding resistance of the swinging scroll, the fixed scroll and the main frame, the deterioration of airtightness, etc. Therefore, it is necessary to suppress the deterioration of the flatness of the flat surface of the main frame.

[0008] The present application discloses a technique for solving the above-mentioned problems, and an object of the present application is to provide a scroll compressor capable of suppressing deterioration in the flatness of a flat surface of a main frame.

[0009] Means for solving problems

[0010] The scroll compressor disclosed in the present application comprises: a fixed scroll having a first scroll body; a swing scroll having a second scroll body, the second scroll body and the first scroll body meshing with each other to form a compression chamber; an Oldham ring provided with a second key portion, the second key portion being received in a pair of second Oldham grooves provided in the swing scroll; a main frame provided with a pair of first Oldham grooves, the pair of first Oldham grooves being used to receive a pair of first key portions provided in the Oldham ring; and a casing which receives the fixed scroll, the swing scroll and the main frame on its inner side.

[0011] In the main frame, a first portion and a second portion are provided on left and right sides of a first axis passing through the center of the first Oldham groove, and the first portion and the second portion have lower rigidity against a bending moment caused by a compressive load applied in a radial direction than other components of the main frame, and

[0012] The first portion and the second portion are arranged so as to straddle a second axis that is a straight line perpendicular to the first axis and passes through the center of the main frame.

[0013] In addition, another scroll compressor disclosed in the present application comprises: a fixed scroll member having a first scroll body; a swing scroll member having a second scroll body, the second scroll body and the first scroll body meshing with each other to form a compression chamber; an Oldham ring, which is provided with a second key portion, the second key portion being received in a pair of second Oldham grooves provided in the swing scroll member; a main frame, which is provided with a pair of first Oldham grooves, the pair of first Oldham grooves being used to receive a pair of first key portions provided in the Oldham ring; and a casing, which receives the fixed scroll member, the swing scroll member and the main frame on the inner side,

[0014] The portion having higher rigidity is provided at a position corresponding to a circumferential position of a portion having lower rigidity with respect to a bending moment generated by a compressive load applied in the radial direction compared to other components of the main frame.

[0015] Effects of the Invention

[0016] According to the scroll compressor disclosed in the present application, it is possible to suppress deterioration in the flatness of the flat surface of the main frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a perspective view showing the scroll compressor according to the first embodiment.

[0018] Figure 2 This is a longitudinal sectional view showing the scroll compressor according to the first embodiment.

[0019] Figure 3This is a perspective view showing an intermediate casing in the scroll compressor according to the first embodiment.

[0020] Figure 4 This is a perspective view showing a main frame in the scroll compressor according to the first embodiment.

[0021] Figure 5 This is a perspective view showing the fixed scroll in the scroll compressor according to the first embodiment.

[0022] Figure 6 This is a perspective view showing the swing scroll in the scroll compressor according to the first embodiment.

[0023] Figure 7 This is a perspective view showing an Oldham ring in the scroll compressor according to the first embodiment.

[0024] Figure 8 This is a perspective view showing a crankshaft in the scroll compressor according to the first embodiment.

[0025] Figure 9 This is a perspective view showing a bushing in the scroll compressor according to the first embodiment.

[0026] Figure 10 It shows Figure 2 Cross-sectional view of the K portion in FIG.

[0027] Figure 11 yes Figure 10 Enlarged view of part A in .

[0028] Figure 12 yes Figure 10 Enlarged view of part B in .

[0029] Figure 13 It is an enlarged perspective view showing a protruding portion.

[0030] Figure 14 It is an enlarged perspective view showing a protruding portion.

[0031] Figure 15 It shows Figure 2 Cross-sectional view of the K portion in FIG.

[0032] Figure 16 It is an enlarged sectional view showing the main frame and the swing scroll portion.

[0033] Figure 17 It is an enlarged sectional view showing the main frame and the swing scroll portion.

[0034] Figure 18 It is an enlarged sectional view showing the main frame and the swing scroll portion.

[0035] Figure 19 It is an enlarged sectional view showing the main frame and the swing scroll portion.

[0036] Figure 20 It is a top view showing the main frame.

[0037] Figure 21 It is along Figure 20 A sectional view obtained by cutting through the plane of the X-axis.

[0038] Figure 22 It is a top view showing the main frame.

[0039] Figure 23 It is a top view showing the main frame.

[0040] Figure 24 It is a top view showing the main frame.

[0041] Figure 25 It is a top view showing the main frame.

[0042] Figure 26 This is a plan view showing a main frame in the scroll compressor according to the second embodiment.

[0043] Figure 27 It is along Figure 26 A sectional view obtained by cutting through the plane of the X-axis.

[0044] Figure 28 is a cross-sectional view showing the main frame.

[0045] Figure 29 This is a perspective view of the main frame viewed from one end.

[0046] Figure 30 This is a perspective view of the main frame viewed from the other end.

[0047] Figure 31 This is a top view of the main frame as seen from the other end.

[0048] Figure 32 This is a top view of the main frame as seen from the other end.

[0049] Figure 33 This is a perspective view of the main frame viewed from one end.

[0050] Figure 34 This is a perspective view of the main frame viewed from the other end.

[0051] Figure 35 This is a top view of the main frame as seen from the other end.

[0052] Figure 36 This is a top view of the main frame as seen from the other end. DETAILED DESCRIPTION

[0053] Implementation method 1.

[0054] The present embodiment relates to a scroll compressor, and more particularly to the structure of a main frame which is a component of the scroll compressor.

[0055] Hereinafter, Embodiment 1 will be described with reference to the accompanying drawings. Figure 1 is a perspective view showing a scroll compressor, Figure 2 is a longitudinal sectional view showing a scroll compressor, Figure 3 is a perspective view showing an intermediate housing in a scroll compressor, Figure 4 is a perspective view showing the main frame, Figure 5 It is a perspective view showing the fixed scroll, and is a view showing the fixed scroll as viewed from the bottom. Figure 6 is a perspective view showing an oscillating scroll member, Figure 6 A is a perspective view showing the swing scroll as viewed from above, Figure 6 B is a perspective view showing the swing scroll as seen from the bottom. Figure 7 is a perspective view showing an Oldham ring. Figure 8 is a perspective view showing a crankshaft, Figure 9 : is a perspective view showing the bushing. Figure 1 The compressor shown is a so-called vertical scroll compressor used in a state where the central axis of the crankshaft is substantially perpendicular to the ground.

[0056] The scroll compressor includes a casing 1, a main frame 2, a compression mechanism 3, a drive mechanism 4, a subframe 5, a crankshaft 6, a bushing 7, and a power supply 8. In the following description, the main frame 2 is used as a reference, and the side (upper side) where the compression mechanism 3 is provided is oriented as one end side, and the side (lower side) where the drive mechanism 4 is provided is oriented as the other end side.

[0057] Shell 1 is a metal box with closed ends, consisting of an intermediate shell 11, an upper shell 12, and a lower shell 13. Intermediate shell 11 is cylindrical, and its sidewall is connected to suction pipe 14 by welding or other means. Suction pipe 14 introduces refrigerant into shell 1 and communicates with the interior of intermediate shell 11.

[0058] The upper shell 12 is constructed in a roughly hemispherical shape, and a part of its side wall is connected to the upper end of the intermediate shell 11 by welding or the like, and the upper shell 12 covers the upper opening of the intermediate shell 11. The discharge pipe 15 is connected to the upper part of the upper shell 12 by welding or the like. The discharge pipe 15 is a pipe that discharges the refrigerant to the outside of the shell 1 and is connected to the internal space of the intermediate shell 11. The lower shell 13 is constructed in a roughly hemispherical shape, and a part of its side wall is connected to the lower end of the intermediate shell 11 by welding or the like, and the lower shell 13 covers the lower opening of the intermediate shell 11. In addition, the shell 1 is supported by a fixing base 16 having a plurality of threaded holes. A plurality of threaded holes are formed in the fixing base 16, and by screwing screws into these threaded holes, the scroll compressor can be fixed to other components such as the casing of the outdoor unit.

[0059] like Figure 4 As shown, the main frame 2 is made of a metal such as cast iron, is formed into a hollow frame with a cavity, and is arranged inside the shell 1. The main frame 2 includes a main body 21, a main bearing 22, and an oil return pipe 23. The main body 21 is fixed to the inner wall surface of one end side of the intermediate shell 11, and a storage space 211 is formed in the central part along the longitudinal direction of the shell 1. The storage space 211 is formed in a stepped shape with one end side open and the space narrowing toward the other end side. On one end side of the main body 21, an annular flat surface 212 is formed in a manner surrounding the storage space 211. On the flat surface 212, an annular thrust plate 24 made of a steel plate material such as valve steel is arranged (see Figure 10 ) Thus, in this embodiment, the thrust plate 24 functions as a thrust bearing.

[0060] In addition, since the thrust plate 24 functions as a thrust bearing, a rotation-stopping member is required to suppress the rotation. Although not shown here, for example, a protrusion thinner than the thickness of the thrust plate 24 is provided on the flat surface 212 of the main frame 2, thereby suppressing the rotation of the thrust plate 24. In addition, a structure in which a groove is formed in the main frame 2, a protrusion is formed on the thrust plate 24, and the two components are fitted together may be adopted. In addition, a suction port 213 is formed at a position on the outer end side of the flat surface 212 of the main frame 2 that does not overlap with the thrust plate 24. The suction port 213 is a space that passes through the main body 21 in the up and down directions, that is, the upper shell 12 side and the lower shell 13 side. In Figure 4 In the embodiment, although two suction ports 213 and two oil return pipes 23 are provided, the number is not limited thereto. In addition, although the suction port 213 is set as a through hole, it can also be a cutout shape with the outer wall removed.

[0061] An Oldham's receiving portion 214 is formed in a stepped portion of the main frame 2 that is closer to the other end side than the flat surface 212. A first Oldham's groove 215 is formed in the Oldham's receiving portion 214. The first Oldham's groove 215 is formed so that a portion of the outer end side cuts the inner end side of the flat surface 212. Therefore, when the main frame 2 is viewed from one end side, a portion of the first Oldham's groove 215 overlaps with the thrust plate 24. Furthermore, the two first Oldham's grooves 215 constituting a pair are formed in an opposing manner. The main bearing portion 22 is formed continuously with the other end side of the main body portion 21, and an axial hole 221 is formed inside the main bearing portion 22. The axial hole 221 passes through the main bearing portion 22 in the up and down directions, and one end side of the axial hole 221 is connected to the receiving space 211. The oil return pipe 23 is a pipe for returning the lubricating oil accumulated in the storage space 211 to the oil reservoir provided inside the lower housing 13 , and is inserted and fixed into an oil drain hole formed through the main frame 2 inside and outside.

[0062] The lubricating oil is, for example, refrigeration oil containing ester-based synthetic oil. The lubricating oil is stored in the lower portion of the housing 1, i.e., the lower housing 13. It is drawn in by the oil pump 52, described later, and passes through an oil passage 63 provided within the crankshaft 6. It is used to reduce wear between mechanically contacting components such as the compression mechanism 3, regulate the temperature of sliding surfaces, and further improve sealing. An oil with excellent lubrication properties, electrical insulation, stability, refrigerant solubility, low-temperature fluidity, and a moderate viscosity is preferred as the lubricating oil.

[0063] The compression mechanism 3 is a compression mechanism for compressing the refrigerant. The compression mechanism 3 is a scroll compression mechanism including a fixed scroll 31 and a swing scroll 32. Figure 2 、 Figure 5 As shown, the fixed scroll 31 is made of a metal such as cast iron and includes a first base plate 311 and a first scroll body 312. The first base plate 311 is formed in a circular plate shape, and a discharge port 313 is formed through the center thereof in the vertical direction. The first scroll body 312 protrudes from the surface on the other end side of the first base plate 311 to form a spiral wall, with its front end protruding toward the other end side.

[0064] like Figure 6 A. Figure 6 As shown in FIG. 2B , the oscillating scroll 32 is made of a metal such as aluminum and includes a second base plate 321, a second scroll body 322, a cylindrical portion 323, and a second Oldham groove 324. The second base plate 321 is formed into a circular plate having one surface, another surface, and a side surface 3212. The second scroll body 322 is formed on the one surface, and at least a portion of the outer peripheral region of the other surface serves as a sliding surface 3211. The side surface 3212 is located radially outermost and connects the one surface to the other surface. Furthermore, the sliding surface 3211 on the other surface is slidable relative to the thrust plate 24 and is supported by the main frame 2.

[0065] The second scroll body 322 protrudes from one surface of the second substrate 321 to form a spiral wall, and its front end protrudes toward one end. In addition, a sealing component is provided at the front end of the first scroll body 312 of the fixed scroll 31 and the second scroll body 322 of the swinging scroll 32, and the sealing component is used to suppress the leakage of the refrigerant. The cylindrical portion 323 is a cylindrical boss formed to protrude from the approximate center of the other surface of the second substrate 321 toward the other end. A swing bearing, a so-called journal bearing, which supports the slider 71 described later as being rotatable, is provided on the inner circumferential surface of the cylindrical portion 323 in such a manner that its center axis is parallel to the center axis of the crankshaft 6.

[0066] The second Euclid groove 324 is a rectangular groove formed on the other surface of the second substrate 321, with one surface formed into a circular arc. Furthermore, the two second Euclid grooves 324 forming a pair are arranged so as to face each other. The line connecting the two second Euclid grooves 324 forming a pair is arranged perpendicular to the line connecting the two first Euclid grooves 215 forming a pair.

[0067] An Oldham ring 33 is provided in the Oldham housing portion 214 provided on the main frame 2. Figure 7 As shown, the Oldham ring 33 includes a ring portion 331, a first key portion 332, and a second key portion 333. The ring portion 331 is formed in an annular shape. In the first key portion 332, two first key portions 332 forming a pair are formed in an opposing manner on the surface of the other end side of the ring portion 331 and are accommodated in two first Oldham grooves 215 forming a pair of the main frame 2. In the second key portion 333, two second key portions 333 forming a pair are formed in an opposing manner on the surface of one end side of the ring portion 331 and are accommodated in two second Oldham grooves 324 forming a pair of the swing scroll 32.

[0068] As the oscillating scroll 32 orbits due to the rotation of the crankshaft 6, the first key portion 332 slides in the first Oldham groove 215, and the second key portion 333 slides in the second Oldham groove 324. Thus, the Oldham ring 33 prevents the oscillating scroll 32 from rotating. The first scroll 312 of the fixed scroll 31 and the second scroll 322 of the oscillating scroll 32 mesh with each other, forming a compression chamber 34. The volume of the compression chamber 34 decreases radially from the outside toward the inside. Therefore, refrigerant is drawn in from the outer ends of the scrolls and moves toward the center, where it is gradually compressed.

[0069] The compression chamber 34 communicates with the discharge port 313 at the center of the fixed scroll 31. A muffler 35 having a discharge hole 351 is provided on one end of the fixed scroll 31. A discharge valve 36 is also provided. This discharge valve 36 opens and closes the discharge hole 351 under specified conditions to prevent backflow of the refrigerant. Refrigerants can be composed, for example, of halogenated hydrocarbons with carbon-carbon double bonds, halogenated hydrocarbons without carbon-carbon double bonds, hydrocarbons, and mixtures thereof. Halogenated hydrocarbons with carbon-carbon double bonds include HFC refrigerants with zero ozone depletion potentials and Freon-based low-GWP refrigerants. Examples include tetrafluoropropylenes such as HFO1234yf, HFO1234ze, and HFO1243zf, represented by the chemical formula C3H2F4. Halogenated hydrocarbons without carbon-carbon double bonds include refrigerants mixed with R32 (difluoromethane) represented by CH2F2 and R41. Examples of hydrocarbons include propane and propylene as natural refrigerants, and examples of mixtures include mixed refrigerants obtained by mixing HFO1234yf, HFO1234ze, HFO1243zf, etc. with R32, R41, etc.

[0070] The drive mechanism 4 is located on the other end of the main frame 2 within the housing 1. The drive mechanism 4 includes a stator 41 and a rotor 42. The stator 41 is an annular stator formed by winding a winding through an insulating layer on an iron core formed, for example, by stacking multiple electromagnetic steel sheets. The stator 41 is fixedly supported within the intermediate housing 11 by shrink fit or other means. The rotor 42 is a cylindrical rotor with a vertical through-hole extending through the center of the iron core, which is formed by stacking multiple electromagnetic steel sheets. The rotor is located within the interior space of the stator 41.

[0071] The sub-frame 5 is a frame made of metal such as cast iron, and is provided on the other end side relative to the drive mechanism portion 4 inside the housing 1. The sub-frame 5 is fixedly supported on the inner peripheral surface of the other end side of the intermediate housing 11 by heat press fitting or welding. The sub-frame 5 includes a sub-bearing portion 51 and an oil pump 52. The sub-bearing portion 51 is a ball bearing provided on the upper side of the central portion of the sub-frame 5, and has a hole extending through the center in the up-down direction. The oil pump 52 is provided on the lower side of the central portion of the sub-frame 5, and is configured so that at least a portion is immersed in the lubricating oil stored in the oil storage portion of the housing 1. In addition, although in Figure 2 Although a ball bearing is shown as the auxiliary bearing portion 51 , it may be, for example, a journal bearing.

[0072] like Figure 8As shown, the crankshaft 6 is a long rod-shaped metal component, which is arranged inside the housing 1. The crankshaft 6 includes a main shaft portion 61, an eccentric shaft portion 62 and an oil passage 63. The main shaft portion 61 is a shaft that constitutes the main part of the crankshaft 6, and its center axis is configured to coincide with the center axis of the intermediate housing 11. The rotor 42 is fixed in contact with the outer surface of the main shaft portion 61. The eccentric shaft portion 62 is arranged on one end side of the main shaft portion 61 in a manner that the center axis of the eccentric shaft portion 62 is eccentric relative to the center axis of the main shaft portion 61. The oil passage 63 is provided to pass through the main shaft portion 61 and the eccentric shaft portion 62 in an upper and lower manner. Regarding the crankshaft 6, one end side of the main shaft portion 61 is inserted into the main bearing portion 22 of the main frame 2, and the other end side of the main shaft portion 61 is inserted into the sub-bearing portion 51 fixed to the sub-frame 5. Thus, the eccentric shaft portion 62 is arranged in the cylinder of the cylindrical portion 323 of the swing scroll 32. The rotor 42 is arranged with a predetermined gap between its outer circumferential surface and the inner circumferential surface of the stator 41. Furthermore, a first balancer 64 is provided on one end of the main shaft portion 61, and a second balancer 65 is provided on the other end of the main shaft portion 61 to offset the imbalance caused by the swinging of the swing scroll 32.

[0073] like Figure 9 As shown, the bushing 7 is made of metal such as iron and is a connecting component connecting the swing scroll 32 and the crankshaft 6. Figure 9 In the embodiment, the bushing 7 is composed of two parts, namely, a slider 71 and a balancing weight 72. The slider 71 is a cylindrical part formed with a flange portion, and is respectively embedded in the eccentric shaft portion 62 and the cylindrical portion 323. The balancing weight 72 is a ring-shaped part having a balancing weight portion 721, which is eccentrically arranged relative to the rotation center to offset the centrifugal force of the swing scroll 32. The balancing weight portion 721 has a roughly C-shape when viewed from one end. The balancing weight 72 is fitted into the flange portion of the slider 71 by, for example, heat press fitting. In addition, with respect to the bushing 7, for example, the slider 71 and the balancing weight 72 can be integrally cut out by machining to form one part.

[0074] like Figure 2 、 Figure 3 As shown, the power supply 8 is a component that supplies power to the scroll compressor and is formed on the outer circumferential surface of the intermediate housing 11 of the housing 1. The power supply 8 includes a cover 81, power supply terminals 82, and wiring 83. Cover 81 is a cover component with a bottom and an opening. Power supply terminals 82 are made of metal, with one end located inside cover 81 and the other inside housing 1. Wiring 83 has one end connected to power supply terminals 82 and the other end connected to stator 41.

[0075] Figure 10 It shows Figure 2 In addition, Figure 11 yes Figure 10 The enlarged view of part A in Figure 12 yes Figure 10 A magnified view of part B in the figure. Figure 10 In the intermediate casing 11, the first protrusion 112 radially protrudes from the first inner wall surface 111. Furthermore, the intermediate casing 11 has a first positioning surface 113, which is the end surface of the first protrusion 112 facing the upper casing 12 and contacts the first base plate 311 of the fixed scroll 31 to determine the axial position of the fixed scroll 31. Furthermore, the intermediate casing 11 has a second inner wall surface 114, which serves as the inner wall surface of the first protrusion 112; and a second protrusion 115, which further radially protrudes from the first protrusion 112. Furthermore, the intermediate casing 11 has a second positioning surface 116, which is the end surface of the second protrusion 115 facing the upper casing 12 and contacts the main body 21 of the main frame 2 to determine the axial position of the main frame 2; and a third inner wall surface 117, which serves as the inner wall surface of the second protrusion 115.

[0076] That is, the intermediate housing 11 has a stepped portion whose inner diameter decreases toward the other end. Furthermore, the first positioning surface 113 and the second positioning surface 116 are formed to be substantially perpendicular to the central axis of the crankshaft 6, and the normal vectors of the two positioning surfaces are formed to face the same direction. Figure 3 As shown, a groove 118 is formed in the first protrusion 112. This groove 118 engages with the protrusion 314 of the fixed scroll 31 and the protrusion 216 of the main frame 2, described later, to determine the phase of the two components. A chamfered portion 1181, chamfered (with a C-chamfer (cutting the corners into an isosceles right triangle) or R-chamfer (chamfering into an arc shape) is formed at the front end of the groove 118 on the upper casing 12 side, gradually narrowing the groove width from the front end. This chamfered portion 1181 acts as a guide, facilitating the guidance of the protrusion 216 of the main frame 2 and the protrusion 314 of the fixed scroll 31. This facilitates assembly and improves the ease of assembly of the compressor.

[0077] Recesses 1131 and 1161 are provided at the corners where the first positioning surface 113 intersects the first inner wall surface 111, and at the corners where the second positioning surface 116 intersects the second inner wall surface 114, respectively. This ensures that the fixed scroll 31 and the main frame 2 reliably contact the respective positioning surfaces. Furthermore, when manufacturing the intermediate casing 11 using a welded steel pipe, which is a steel pipe formed by rolling or stamping a sheet of steel into a tubular shape and then welding the joints, the grooves 118 can be formed in locations other than the welded joints, thereby ensuring that the reliability of the intermediate casing 11 is not compromised.

[0078] like Figure 4 As shown, the main frame 2 has a protrusion 216 that protrudes radially from the outer diameter of the main body portion 21 . Figure 13This is an enlarged stereoscopic view showing the protrusion. A chamfered portion 2161 having a C-chamfer or R-chamfer is formed at the front end of the protrusion 216 on the lower shell 13 side, so that the width of the protrusion gradually increases from the front end. The protrusion 216 is engaged with the groove 118 formed in the intermediate shell 11, thereby determining the phase of the main frame 2. In addition, the main body 21 of the main frame 2 is brought into contact with the second positioning surface 116 formed in the intermediate shell 11, thereby determining the axial position of the main frame 2. Furthermore, in this state, the main frame 2 is fixed to the second inner wall surface 114 or the third inner wall surface 117 of the intermediate shell 11 by press-fitting or shrink-fitting, thereby determining the center position. In addition, if the holding force is insufficient, arc spot welding or the like can be further performed. Through the above operations, the main frame 2 can be retained in the intermediate shell 11 in a state where the center position, axial height position, and phase relative to the intermediate shell 11 are determined.

[0079] like Figure 5 As shown, the fixed scroll 31 has a protrusion 314 that protrudes toward the lower housing 13 from a surface of the first base plate 311 on the side where the first scroll body 312 is formed. Figure 14 : is an enlarged stereoscopic view showing the protrusion. A chamfered portion 3141 having a C chamfer or an R chamfer is formed at the front end of the protrusion 314 on the side of the lower housing 13, so that the width of the protrusion gradually increases from the front end. The protrusion 314 is engaged with the groove 118 formed in the intermediate housing 11, thereby determining the phase of the fixed scroll 31. In addition, as Figure 10 As shown, the surface of the first base plate 311 of the fixed scroll 31, which forms the first scroll body 312, is brought into contact with the first positioning surface 113 formed on the intermediate housing 11, thereby determining the axial position of the fixed scroll 31. Furthermore, in this state, the side surface 3111 of the first base plate 311 is fixed to the first inner wall surface 111 of the intermediate housing 11 by shrink fit, thereby determining the center position. Through the above operation, the fixed scroll 31 can be retained in the intermediate housing 11 while its center position, axial height position, and phase relative to the intermediate housing 11 are determined. Furthermore, the fixed scroll 31 is provided with the function of separating high and low pressure within the housing 1. Therefore, it is necessary to pressurize the entire circumference of the side surface 3111 of the first base plate 311 of the fixed scroll 31 and the first inner wall surface 111 of the intermediate housing 11 through shrink fit to prevent refrigerant leakage. Therefore, the shrink fit location is set to the first inner wall surface 111, which does not have the groove 118 formed therein.

[0080] Next, according to Figure 15 A method of adjusting the gaps (tips) between the front ends of the scroll bodies of the fixed scroll 31 and the orbiting scroll 32 and the respective base plates will be described. Figure 15 is with Figure 10 Shown similarly Figure 2: This is a cross-sectional view of the K portion in FIG. , and is a diagram showing the dimensions of each component. When the dimensions of each component are set as described below, the tooth tip clearance Q can be expressed by the following formula.

[0081]

[0082] L=M+Q+N+T+P

[0083] That is, Q=LMNTP.

[0084] Once the dimensions of each component are known through measurement, the target tip clearance Q can be determined by adjusting the thickness T of the thrust plate 24 to maximize mass production. The target tip clearance Q is set at 71 ± 5 μm. This value is for a representative model, and the target value varies depending on the model.

[0085] By making such adjustments, it is possible to suppress the refrigerant from leaking into the adjacent compression space through the gap between the front end of the scroll body and each base plate, thereby reducing the loss of the scroll compressor.

[0086] Next, regarding the fixing of the intermediate housing 11 and the main frame 2, according to Figures 16 to 19 The deformation mechanism of the main frame 2 during fixing will be described. Figures 16 to 19 It is an enlarged sectional view showing a portion of the main frame 2 and the swing scroll 32 . Figures 16 to 19 The Z axis 28 shown is a straight line perpendicular to the flat surface 212 of the main frame 2 and passing through the center of the outer diameter portion where the stress F is generated. Figure 16 In the embodiment, a swing scroll 32 is placed on the main frame 2. Figure 16 As shown in this state, a stress F is generated in the surface of the outer diameter portion of the main frame 2 by the shrinkage fit of the intermediate housing 11. The flat surface 212 of the main frame 2 is as shown in FIG. Figure 17 In addition, Figure 17 Figure 2 shows the deformation of the main frame 2 when the suction port 213 is located on one side of the Z-axis 28. This suction port 213 is a portion with low rigidity against the bending moment caused by stress F generated by a compressive load applied in the radial direction. Portions 25, which are less rigid than other components of the main frame 2, include, in addition to the suction port 213, pin holes for positioning required during machining, holes for suppressing oscillatory rotation during vibration, an Oldham groove, and holes for determining the phase of the fixed scroll.

[0087] exist Figure 18 、 Figure 19 , the deformation of the main frame 2 is shown when the portion 25 with lower rigidity is located on both sides of the Z axis 28. Figure 17The flatness of the flat surface 212 of the main frame 2 when deformed is compared with the case where the portion 25 with lower rigidity is located on one side of the Z axis 28. Figure 19 As shown, when the lower-rigidity portions 25 are located on both sides of the Z-axis 28, the flatness of the flat surface 212 of the main frame 2 during deformation is improved. Therefore, with the flat surface 212 of the main frame 2 as the reference plane, the slope of the oscillating scroll 32 relative to the flat surface 212 when the oscillating scroll 32 is installed on the main frame 2 is smaller. This allows for highly precise assembly of the tooth tip clearance Q, thereby suppressing leakage into adjacent compression spaces and reducing losses in the scroll compressor.

[0088] Furthermore, since deterioration in the flatness of the flat surface 212 of the main frame 2 can be suppressed, an increase in the sliding resistance of the swing scroll 32 can be suppressed, and degradation in the performance of the scroll compressor can be suppressed.

[0089] Next, use Figure 20 、 Figure 21 The arrangement of the portion 25 of the main frame 2 having low rigidity in the structure of the main frame 2 will be described. Figure 20 is a top view showing the main frame, Figure 21 It is along Figure 20 215. The cross-sectional view is obtained by cutting along a plane passing through the X-axis 26 in FIG. The Z-axis 28 is a straight line perpendicular to the flat surface 212 of the main frame 2 and passing through the center of the outer peripheral surface of the main frame 2. Furthermore, the Y-axis 27 is a straight line passing through the center of the first Euclid groove 215 and intersecting the Z-axis 28. Furthermore, the X-axis 26 is a straight line perpendicular to the Y-axis 27 and intersecting the Z-axis 28.

[0090] When the first portion 251 of the main frame 2 having low rigidity is provided across the second and third quadrants, the second portion 252 having low rigidity is provided across the first and fourth quadrants. Figure 20 In the embodiment, a pair of low-rigidity portions 251 and 252 are located symmetrically about the Y-axis 27 and face each other across the Z-axis 28, which is the central axis of the main frame 2. Specifically, two low-rigidity portions, namely, the first portion 251 with low rigidity and the second portion 252 with low rigidity, are provided on the left and right sides of the Y-axis (first axis), which is a straight line passing through the center of the first Oldham groove 215 and intersecting the Z-axis 28. Furthermore, when a straight line perpendicular to the Y-axis 27 and intersecting the Z-axis 28, which is a straight line passing through the center of the outer peripheral surface of the main frame 2, is defined as the X-axis 26 (second axis), the first portion 251 with low rigidity and the second portion 252 with low rigidity are arranged so as to straddle the X-axis 26.

[0091] exist Figure 20In FIG. 2 , the portions 251 and 252 of the main frame 2 with low rigidity are shown as having the same shape. However, there is no problem if the portions 251 and 252 are asymmetrical about the X-axis 26 and the Y-axis 27 or have different shapes or numbers.

[0092] For example, Figure 22 As shown, a hole 220 may be provided. In addition, the portion 25 having lower rigidity may be configured to be asymmetrical with respect to the X-axis 26 or the Y-axis 27. In addition, a different shape or a different number may be used.

[0093] Furthermore, the shape of the portion 25 with low rigidity may be a hole, a cutout, a groove, or the suction port 213 . Figure 23 2 is a top view showing a case where the cutout 230 is provided. Figure 24 2 is a top view showing a state where the hole 240 is provided. Figure 25 2 is a plan view showing a state where grooves 250 are provided. These grooves 250 are provided to suppress deterioration in the flatness of the flat surface 212 of the main frame 2.

[0094] Furthermore, when the portion 25 with relatively low rigidity corresponds to the suction port 213, it is preferable that a portion of the suction port 213 be located outside the trajectory of the oscillating scroll 32 to allow refrigerant to pass through the main frame 2. This is to prevent the second base plate 321 of the oscillating scroll 32 from blocking the passage of refrigerant. Specifically, when the suction port 213 corresponds to the portion with relatively low rigidity, the portion 25 with relatively low rigidity is located radially outward relative to the oscillating scroll 32.

[0095] Implementation method 2.

[0096] Hereinafter, Embodiment 2 will be described with reference to the accompanying drawings. Figure 26 is a top view showing the main frame, Figure 27 It is along Figure 26 , taken along a plane passing through the X-axis. In this embodiment, the structure of the main frame 2 includes a portion 100 of the main frame 2 having a high degree of rigidity. The Z-axis 28 is a straight line perpendicular to the flat surface 212 of the main frame 2 and passing through the center of the outer diameter. Furthermore, the Y-axis 27 is a straight line passing through the center of the first Euclid groove 215 and intersecting the Z-axis 28. Furthermore, the X-axis 26 is a straight line perpendicular to the Y-axis 27 and intersecting the Z-axis 28.

[0097] like Figure 26 As shown, when the lower rigidity portion 25 of the main frame 2 is arranged across the second and third quadrants, as shown in FIG. Figure 27 As shown in FIG, a portion 100 having a high rigidity is provided across the second and third quadrants. Figure 27As shown in FIG. 1 , the portion 100 having a thickness provided circumferentially across the second and third quadrants becomes a portion having a high rigidity, and this portion is provided as a rib. That is, the portion 100 having a high rigidity is provided at a position corresponding to the circumferential position of the portion 25 having a low rigidity of the main frame 2. Figure 26 In the figure, the position corresponding to the circumferential position is the angular range θ in which the portion 25 with lower rigidity is provided, and the portion 100 with higher rigidity is provided within the same angular range θ.

[0098] like Figure 16 As shown in FIG, the moment of inertia of the cross section with respect to the bending moment caused by the stress F generated by the compressive load applied in the radial direction is larger than the moment of inertia of the cross section in the 1st and 4th quadrants, so the rigidity in the 2nd and 3rd quadrants is higher than that in the 1st and 4th quadrants. In addition, the portion 25 with lower rigidity and the portion 100 with higher rigidity are located in the same phase (the same position corresponding to the circumferential position). In this case, it only refers to the same phase, and there is freedom in the radial direction. In addition, Figure 22 The structure shown is the same, and the portion 100 with higher rigidity can also be a portion that is asymmetric about the X-axis 26 and the Y-axis 27, a portion with a different shape, or a portion with a different number.

[0099] In addition, in the above description, although the case where the rib is provided integrally with the main frame 2 as a portion having high rigidity of the main frame 2 is shown, Figure 28 As shown, components different from the main frame 2 may be provided to replace the ribs. Figure 28 , a case where bracket 281 is mounted as a separate component using screws 280 is shown. In this manner, even if a portion with higher rigidity is arranged at a position that compensates for a portion with lower rigidity, degradation of the flatness of flat surface 212 of main frame 2 can be suppressed, similar to Embodiment 1. Furthermore, if portions with lower rigidity 25 are bilaterally symmetrical, portions with higher rigidity are unnecessary.

[0100] Implementation method 3.

[0101] Hereinafter, Embodiment 3 will be described with reference to the accompanying drawings. Figure 29 From one end (refer to Figure 2 )Observe the stereogram of the main frame, Figure 30 This is a three-dimensional view of the main frame viewed from the other end. Figure 31 、 Figure 32 This is a top view of the main frame as viewed from the other end. In the figure, the main frame 2 is provided with ribs 100A, 100B, 100C, 100D, 100E, and 100F as parts with high rigidity. In this embodiment, the structure of the main frame 2 is shown in the dotted line (see FIG. Figure 30 and Figure 31), the ribs 100A, 100B, 100C, 100D, 100E, 100F, the main body 21, and the main bearing 22, which are the relatively rigid parts of the main frame 2, form truss structures 29A, 29B, and 29C. For example, truss structure 29A is composed of rib 100A, the main bearing 22, rib 100F, and the main body 21. Rib 100F and the main body 21 are rigidly connected at joints 29A1, rib 100A and the main body 21 are rigidly connected at joints 29A2, and rib 100F and the main bearing 22, and rib 100A and the main bearing 22, respectively, are rigidly connected at joints 29A3. Truss structures 29B and 29C are similarly constructed. In this structure, joints 29A1, 29A2, ..., 29C3 are rigidly connected to form truss structures 29A, 29B, and 29C.

[0102] like Figure 30 、 Figure 31 As shown, ribs 100A, 100B, 100C, 100D, 100E, and 100F are provided as portions having high rigidity from the main body 21 of the main frame 2 toward the main bearing 22. That is, one axial end side of the ribs 100A, 100B, 100C, 100D, 100E, and 100F on the main body 21 side, which serves as a connection portion between the ribs 100A, 100B, 100C, 100D, 100E, and 100F and the main body 21 of the main frame 2, is connected to a portion of the main frame 2 contacting the housing 1. Here, the axial direction refers to the direction of the main body 21. Figure 2 In addition, the circumferential position of the axial end side of the main body 21 side of the ribs 100A, 100B, 100C, 100D, 100E, and 100F is located within the circumferential range of the main body 21 to which stress is applied (within the circumferential range of the main body 21 to which stress is applied). Figure 31 For example, regarding the ribs 100A and 100B, one axial end side of the main body 21 side is located within the circumferential range 200). In addition, as Figure 31 As shown, the circumferential position of the axial other end side of the main bearing portion 22 of the ribs 100A, 100B, 100C, 100D, 100E, 100F, which serves as the connection portion between the ribs 100A, 100B, 100C, 100D, 100E, 100F and the main bearing portion 22 of the main frame 2, is located within the circumferential range of the portion 25A, 25B, 25C with lower rigidity (for example, the circumferential position of the axial other end side of the main bearing portion 22 of the rib 100A is located within the circumferential range 300 of the portion 25A with lower rigidity).

[0103] Thus, when the main frame 2 is fixed to the shell 1 by means of shrink fit or the like, deformation of the main frame 2 caused by stress generated at the contact portion between the main frame 2 and the shell 1 can be suppressed. That is, since the truss structures 29A, 29B, and 29C are adopted as described above, even if internal stress is generated in the main frame 2, deterioration of the flatness of the flat surface 212 of the main frame 2 can be prevented. In addition, the ribs 100A and 100B are arranged symmetrically with respect to the center Q of the surface of the main body 21 that contacts the shell 1. The same applies to ribs 100C and 100D, and ribs 100E and 100F. Thus, when the main frame 2 is fixed to the shell 1 by means of shrink fit or the like, deformation of the main frame 2 caused by stress generated at the contact portion between the main frame 2 and the shell 1 is symmetrical, and thus deterioration of the flatness of the flat surface 212 of the main frame 2 can be suppressed.

[0104] In this case, as shown by the dotted line, the truss structure 29A is composed of the main body 21, the relatively rigid parts 100A and 100F, and the main bearing 22. In addition, the truss structure 29B is similar to the truss structure 29A and is composed of the main body 21, the relatively rigid parts 100B and 100C, and the main bearing 22 as shown by the dotted line. In addition, the truss structure 29C is similar to the truss structures 29A and 29B and is composed of the main body 21, the relatively rigid parts 100D and 100E, and the main bearing 22 as shown by the dotted line. Figure 31 、 Figure 32 As shown, in truss structure 29A, adjacent ribs 100A are connected to the other axial end side of 100F on the main bearing portion 22 side. Furthermore, in truss structure 29B, adjacent ribs 100B are connected to the other axial end side of 100C on the main bearing portion 22 side. Furthermore, in truss structure 29C, adjacent ribs 100D are connected to the other axial end side of 100E on the main bearing portion 22 side.

[0105] Thus, when the main frame 2 is fixed to the housing 1 by shrink fitting or the like, deformation of the main frame 2 due to stress generated at the contact portion between the main frame 2 and the housing 1 can be suppressed. Figure 30 、 Figure 31 The truss structures 29A, 29B, and 29C shown are structures that, when stress is generated in the main body 21 of the main frame 2, can suppress the bending moment generated by the internal stress generated in the main body 21, the relatively rigid portions 100A, 100B, 100C, 100D, 100E, 100F, and the main bearing 22. Therefore, it is possible to suppress the deterioration of the flatness of the flat surface 212 of the main frame 2. In addition, as Figure 32 As shown, the adjacent ribs 100A and 100F are provided so as to be in contact with each other at the dotted line portion R of the main bearing portion 22. This also applies to the relationship between the ribs 100B and 100C, and the relationship between the ribs 100D and 100E.

[0106] Implementation method 4.

[0107] Hereinafter, Embodiment 4 will be described with reference to the accompanying drawings. Figure 33 This is a three-dimensional view of the main frame viewed from one end. Figure 34 This is a three-dimensional view of the main frame viewed from the other end. Figure 35 、 Figure 36 This is a top view of the main frame as viewed from the other end. In the figure, the main frame 2 is provided with parts 100A, 100B, 100C, 100D, 100E, 100F, 100G, and 100H having high rigidity. In this embodiment, the structure of the main frame 2 is shown in the dotted line (see FIG. Figure 34 、 Figure 35 ), the ribs 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, the main body 21, and the main bearing 22, which are the relatively rigid parts of the main frame 2, form truss structures 29A, 29B, 29C, and 29D. For example, truss structure 29A is composed of rib 100A, the main bearing 22, rib 100H, and the main body 21. Rib 100H and the main body 21 are rigidly connected at joints 29A1, rib 100A and the main body 21 are rigidly connected at joints 29A2, and rib 100H and the main bearing 22, as well as rib 100A and the main bearing 22, are rigidly connected at joints 29A3. Truss structures 29B, 29C, and 29D are similarly constructed. In this structure, the joints 29A1, 29A2, ..., 29D3 are rigidly joined to form truss structures 29A, 29B, 29C, 29D.

[0108] like Figure 34 、 Figure 35 As shown, ribs 100A, 100B, 100C, 100D, 100E, 100F, 100G, and 100H are provided as portions having high rigidity from the main body 21 of the main frame 2 toward the main bearing 22. That is, the ribs 100A, 100B, 100C, 100D, 100E, 100F, 100G, and 100H are connected to the portion of the main frame 2 contacting the housing 1 on one axial end side of the main body 21, which is the connection portion between the main body 21 of the ribs 100A, 100B, 100C, 100D, 100E, 100F, 100G, and 100H. Here, the axial direction refers to the direction of the main body 21. Figure 2 Furthermore, similarly to the case of the third embodiment, the circumferential positions of the ribs 100A, 100B, 100C, 100D, 100E, 100F, 100G, and 100H at one axial end side on the main body 21 side are located within the circumferential range of the main body 21 to which stress is applied.

[0109] In addition, if Figure 35As shown, the axially opposite ends of the ribs 100A, 100B, 100C, 100D, 100E, 100F, 100G, and 100H, which connect the main bearing 22 side of the ribs 100A, 100B, 100C, 100D, 100E, 100F, 100G, and 100H to the main bearing 22 of the main frame 2, are located within the circumferential range of the relatively low-rigidity portions 25A, 25B, 25C, and 25D. This prevents deformation of the main frame 2 caused by stress generated at the contact portion between the main frame 2 and the housing 1 when the main frame 2 is secured to the housing 1 by shrink fit or the like. Specifically, the use of the truss structures 29A, 29B, 29C, and 29D as described above prevents deterioration in the flatness of the flat surface 212 of the main frame 2 even when internal stress is generated within the main frame 2.

[0110] In addition, the ribs 100A and 100B are arranged symmetrically with respect to the center of the surface of the main body 21 that contacts the shell 1. The same applies to ribs 100C and 100D, ribs 100E and 100F, and ribs 100G and 100H. Therefore, when the main frame 2 is fixed to the shell 1 by shrink fit or the like, the deformation of the main frame 2 caused by the stress generated at the contact portion between the main frame 2 and the shell 1 is symmetrical, thereby suppressing the deterioration of the flatness of the flat surface 212 of the main frame 2. At this time, as shown by the dotted line, the truss structure 29A is composed of the main body 21, the parts 100A and 100H with higher rigidity, and the main bearing part 22. In addition, the truss structure 29B is composed of the main body 21, the parts 100B and 100C with higher rigidity, and the main bearing part 22, as shown by the dotted line, like the truss structure 29A. Furthermore, the truss structure 29C, like the truss structures 29A and 29B, is composed of a main body 21, relatively rigid portions 100D and 100E, and a main bearing 22, as indicated by the dotted lines. Furthermore, the truss structure 29D, like the truss structures 29A, 29B, and 29C, is composed of a main body 21, relatively rigid portions 100F and 100G, and a main bearing 22, as indicated by the dotted lines.

[0111] In addition, if Figure 35 、 Figure 36As shown, in the truss structure 29A, adjacent ribs 100A are connected to the other axial end side of the main bearing portion 22 side of 100H. Furthermore, in the truss structure 29B, adjacent ribs 100B are connected to the other axial end side of the main bearing portion 22 side of 100C. Furthermore, in the truss structure 29C, adjacent ribs 100D are connected to the other axial end side of the main bearing portion 22 side of 100E. Furthermore, in the truss structure 29D, adjacent ribs 100F are connected to the other axial end side of the main bearing portion 22 side of 100G. Thus, when the main frame 2 is fixed to the housing 1 by shrink fit or the like, deformation of the main frame 2 caused by stress generated at the contact portion between the main frame 2 and the housing 1 can be suppressed. Figure 34 、 Figure 35 The truss structures 29A, 29B, 29C, and 29D shown are structures that, when stress is generated in the main body 21 of the main frame 2, can suppress the bending moment generated by the internal stress generated in the main body 21, the relatively rigid portions 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, and the main bearing 22. Therefore, it is possible to suppress the deterioration of the flatness of the flat surface 212 of the main frame 2. In addition, as Figure 36 As shown, adjacent ribs 100A and 100H are provided so as to be in contact with each other at a dotted line portion R of the main bearing portion 22. This also applies to the relationship between the ribs 100B and 100C, the relationship between the ribs 100D and 100E, and the relationship between the ribs 100F and 100G.

[0112] Although the present application describes various exemplary embodiments and examples, the various features, methods, and functions described in one or more embodiments are not limited to application in specific embodiments and can be applied to the embodiments alone or in various combinations.

[0113] Therefore, numerous variations not shown in the examples are conceivable within the scope of the technology disclosed in this application, including, for example, variations, additions, or omissions of at least one component, and extraction of at least one component and combination with components of other embodiments.

[0114] Label Description

[0115] 1: Shell; 2: Main frame; 21: Main body; 22: Main bearing; 215: 1st Oldham groove; 25, 25A, 25B, 25C, 25D: Portions with lower rigidity; 251: 1st portion; 252: 2nd portion; 31: Fixed scroll; 312: 1st scroll body; 32: Swinging scroll; 322: 2nd scroll body; 324: 2nd Oldham groove; 33: Oldham ring; 332: 1st key portion; 333: 2nd key portion; 34: Compression chamber; 100, 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H: Portions with higher rigidity.

Claims

1. A scroll compressor comprising: a fixed scroll having a first scroll body; a swing scroll having a second scroll body, the second scroll body and the first scroll body meshing with each other to form a compression chamber; an Oldham ring having a second key portion, the second key portion being received in a pair of second Oldham grooves provided in the swing scroll; a main frame having a pair of first Oldham grooves, the pair of first Oldham grooves being used to receive a pair of first key portions provided in the Oldham ring; and a housing which receives the fixed scroll, the swing scroll and the main frame on its inner side. A portion having higher rigidity is provided at a position corresponding to a circumferential position of a portion having lower rigidity with respect to a bending moment generated by a compressive load applied in the radial direction than other components of the main frame, thereby suppressing deformation of the main frame caused by stress generated at a contact portion between the main frame and the housing. The portion with higher rigidity is the rib, One axial end side of the rib on the main body side, which is the connection portion between the rib and the main body of the main frame, is connected to a portion outside the circumferential range of a portion of the main frame contacting the shell and having low rigidity against bending moment.

2. The scroll compressor according to claim 1, wherein: The circumferential position of the other axial end of the rib on the main bearing side, which is a connection portion between the rib and the main bearing of the main frame, is located within the circumferential range of a portion having low rigidity.

3. The scroll compressor according to claim 1 or 2, wherein: The less rigid portion is a hole, a slot or a cutout.

4. The scroll compressor according to any one of claims 1 to 2, wherein: The portion with low rigidity is located on the outer diameter side of the swing scroll.

5. The scroll compressor according to claim 3, wherein: The portion with low rigidity is located on the outer diameter side of the swing scroll.

6. A scroll compressor comprising: a fixed scroll having a first scroll body; a swing scroll having a second scroll body, the second scroll body and the first scroll body meshing with each other to form a compression chamber; an Oldham ring having a second key portion, the second key portion being received in a pair of second Oldham grooves provided in the swing scroll; a main frame having a pair of first Oldham grooves, the pair of first Oldham grooves being used to receive a pair of first key portions provided in the Oldham ring; and a housing which receives the fixed scroll, the swing scroll and the main frame on its inner side. A portion having higher rigidity is provided at a position corresponding to a circumferential position of a portion having lower rigidity with respect to a bending moment generated by a compressive load applied in the radial direction than other components of the main frame, thereby suppressing deformation of the main frame caused by stress generated at a contact portion between the main frame and the housing. The portion with higher rigidity is the rib, One axial end of the rib on the main body side is connected to a portion of the main frame that contacts the housing, serving as a connection portion between the rib and the main body of the main frame. The circumferential position of the other axial end of the rib on the main bearing side, which is a connection portion between the rib and the main bearing of the main frame, is located within the circumferential range of a portion with low rigidity. The other axial end sides of the two adjacent ribs on the main bearing side are connected to each other.

7. A scroll compressor comprising: a fixed scroll having a first scroll body; a swing scroll having a second scroll body, the second scroll body and the first scroll body meshing with each other to form a compression chamber; an Oldham ring having a second key portion, the second key portion being received in a pair of second Oldham grooves provided in the swing scroll; a main frame having a pair of first Oldham grooves, the pair of first Oldham grooves being used to receive a pair of first key portions provided in the Oldham ring; and a housing which receives the fixed scroll, the swing scroll and the main frame on its inner side. A portion having higher rigidity is provided at a position corresponding to a circumferential position of a portion having lower rigidity with respect to a bending moment generated by a compressive load applied in the radial direction than other components of the main frame, thereby suppressing deformation of the main frame caused by stress generated at a contact portion between the main frame and the housing. The portion with higher rigidity is the rib, One axial end of the rib on the main body side is connected to a portion of the main frame that contacts the housing, serving as a connection portion between the rib and the main body of the main frame. A plurality of the ribs are provided, and two of the plurality of ribs are provided bilaterally symmetrically with respect to a center of a surface where the main frame contacts the housing.

8. A scroll compressor comprising: a fixed scroll having a first scroll body; a swing scroll having a second scroll body, the second scroll body and the first scroll body meshing with each other to form a compression chamber; an Oldham ring having a second key portion, the second key portion being received in a pair of second Oldham grooves provided in the swing scroll; a main frame having a pair of first Oldham grooves, the pair of first Oldham grooves being used to receive a pair of first key portions provided in the Oldham ring; and a housing which receives the fixed scroll, the swing scroll and the main frame on its inner side. A portion having higher rigidity is provided at a position corresponding to a circumferential position of a portion having lower rigidity with respect to a bending moment generated by a compressive load applied in the radial direction than other components of the main frame, thereby suppressing deformation of the main frame caused by stress generated at a contact portion between the main frame and the housing. The portion with high rigidity is a component different from the main frame.

9. The scroll compressor according to any one of claims 6 to 8, wherein: The less rigid portion is a hole, a slot or a cutout.

10. The scroll compressor according to any one of claims 6 to 8, wherein: The portion with low rigidity is located on the outer diameter side of the swing scroll.

11. The scroll compressor according to claim 9, wherein: The portion with low rigidity is located on the outer diameter side of the swing scroll.

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