Scroll compressor

Abstract

A scroll compressor according to the present invention comprises, on an upper surface of an Oldham ring 17, a pair of fixed scroll-side key parts 17a which slide with respect to a fixed scroll 11, and a pair of orbiting scroll-side key parts 17b which slide with respect to an orbiting scroll 12, wherein an oil relief groove 60 is formed on a recess thrust surface 45a of an Oldham ring recess 45 formed in a main bearing 40, an Oldham ring lower surface groove 61 is provided as the oil relief groove 60, and the Oldham ring lower surface groove 61 is formed on a recess thrust surface 45 on which the a pair of fixed scroll-side key parts 17a are located. Therefore, oil compression is mitigated while the Oldham ring 17 moves, whereby it is possible to reduce an input to the compressor and a load to the Oldham ring 17.

Description

[TECHNICAL FIELD]

[0001] The present invention relates to a scroll compressor used in cooling devices such as a heating and cooling air conditioning equipment and a refrigerator, or a freezing device such as a heat pump type hot water supply system.[BACKGROUND TECHNIQUE]

[0002] A scroll compressor described in Patent Document 1 forms a communication space that connects a movable side passage and an annular space in an end plate of a movable scroll. When the movable scroll performs an eccentric rotational movement, oil in the annular space flows into the communication space, and oil in the communication space flows out to compression chambers through the movable side passage. Therefore, in the scroll compressor described in Patent Document 1, it is possible to discharge oil from the annular space and suppress oil agitation loss.[PRIOR ART DOCUMENT][PATENT DOCUMENT]

[0003] [Patent Document 1] Japanese Patent Application Laid-open No. 2020-7933[SUMMARY OF THE INVENTION][PROBLEM TO BE SOLVED BY THE INVENTION]

[0004] A back pressure chamber where an Oldham ring is placed is filled with lubricant oil. Therefore, when the Oldham ring moves, oil compression occurs in an outer peripheral gap which is decreasing on a side where the Oldham ring approaches a recess wall surface.

[0005] Therefore, it is an object of the present invention to provide a scroll compressor that can reduce a compressor input and load on the Oldham ring, through mitigating oil compression when the Oldham ring moves.[MEANS FOR SOLVING THE PROBLEM]

[0006] A scroll compressor of the present invention described in claim 1 including a hermetical container 1 in which a compression mechanism 10 for compressing refrigerant, an electric mechanism20 for driving the compression mechanism 10, and a main shaft 30 that rotates by the electric mechanism 20 to operate the compression mechanism 10 are arranged, wherein an oil reservoir 4 is formed in a bottom of the hermetical container 1, the compression mechanism 10 includes a fixed scroll 11 and an orbiting scroll 12, the fixed scroll 11 includes a disk-shaped fixed scroll end plate 11a and a fixed spiral wrap 11b standing on the fixed scroll end plate 11a, the orbiting scroll 12 includes a disk-shaped orbiting scroll end plate 12a, an orbiting spiral wrap 12b standing on a lap side end surface of the orbiting scroll end plate 12a, and a boss section 12c formed on a side opposite to the lap side end surface of the orbiting scroll end plate 12a, the fixed spiral wrap 11b and the orbiting spiral wrap 12b are meshed with each other to form a plurality of compression chambers 15 between the fixed spiral wrap 11b and the orbiting spiral wrap 12b, a main bearing 40 for supporting the fixed scroll 11 and the orbiting scroll 12 is provided below the fixed scroll 11 and the orbiting scroll 12, an Oldham ring 17 for restraining self-rotation of the orbiting scroll 12 is provided between the main bearing 40 and the fixed scroll 11, the main bearing 40 is formed with a bearing 41 for supporting the main shaft 30, a boss-accommodating section 42 for accommodating the boss section 12c, and an Oldham ring recess 45 for placing the Oldham ring 17, the main shaft 30 has an oil supply hole 34 extending from a lower end portion 33 to an upper end portion, and lubricant oil in the oil reservoir 4 is guided through the oil supply hole 34 to the Oldham ring recess 45, wherein an oil relief groove 60 is formed on a recess thrust surface 45a of the Oldham ring recess 45.

[0007] The scroll compressor of the invention described in claim 2 according to claim 1, wherein an upper surface of the Oldham ring 17 is provided with a pair of fixed scroll-side key parts 17a that slide with respect to the fixed scroll 11 and a pair of orbiting scroll-side key parts 17b that slide with respect to the orbiting scroll 12, an Oldham ring lower surface groove 61 is provided as the oil relief groove 60, and the Oldham ring lower surface groove 61 is formed on the recess thrust surface 45a where the pair of fixed scroll-side key parts 17a are located.

[0008] The scroll compressor of the invention described in claim 3 according to claim 1, wherein a ring groove 62 is provided as the oil relief groove 60, and the ring groove 62 is formed on an outer circumference of the recess thrust surface 45a.

[0009] The scroll compressor of the invention described in claim 4 according to claim 1, wherein the upper surface of the Oldham ring 17 is provided with a pair of fixed scroll-side key parts 17a that slide with respect to the fixed scroll 11 and a pair of orbiting scroll-side key parts 17b that slide with respect to the orbiting scroll 12, a communication groove 63 is provided as the oil relief groove 60, and the communication groove 63 is formed on the recess thrust surface 45a where the pair of fixed scroll-side key parts 17a are not located.

[0010] The scroll compressor of the invention described in claim 5 according to claim 2, wherein a radial lower surface groove width 61L of the Oldham ring lower surface groove 61 is formed larger than a radial fixed scroll-side key part width 17L of the Oldham ring 17 where the fixed scroll-side key parts 17a are located.

[0011] The scroll compressor of the invention described in claim 6 according to claim 3, wherein the ring groove 62 is formed along a recess wall surface 45b.

[0012] The scroll compressor of the invention described in claim 7 according to claim 4, wherein a plurality of communication grooves 63 are arranged symmetrically with respect to a virtual X-axis line passing through the pair of fixed scroll-side key parts 17a.[EFFECT OF THE INVENTION]

[0013] According to the present invention, when the Oldham ring moves, it is possible to mitigate oil compression by lubricant oil existing in the decreasing outer peripheral gap by moving the lubricant oil existing in the decreasing outer peripheral gap on the side where the Oldham ring approaches the recess wall surface through the oil relief groove from the decreasing outer peripheral gap, thereby reducing a compressor input and a load on the Oldham ring.[BRIEF DESCRIPTION OF THE DRAWINGS]

[0014] Fig. 1 is a vertical sectional view of a scroll compressor according to an embodiment of the present invention; Fig. 2 are perspective views showing an Oldham ring in Fig. 1; Fig. 3 are diagram showing a main bearing of the scroll compressor in Fig. 1; Fig. 4 are diagram showing the main bearing and the Oldham ring of the scroll compressor in Fig. 1; Fig. 5 are sectional views showing a main bearing according to another embodiment of the present invention; Fig. 6 are plan views showing a main bearing according to yet another embodiment of the present invention; and Fig. 7 is a plan view showing a main bearing according to yet another embodiment of the present invention. [MODE FOR CARRYING OUT THE INVENTION]

[0015] A scroll compressor according to a first embodiment of the present invention forms an oil relief groove on a recess thrust surface of an Oldham ring recess. According to this embodiment, when an Oldham ring moves, it is possible to mitigate oil compression by lubricant oil existing in a decreasing outer peripheral gap by moving the lubricant oil existing in the decreasing outer peripheral gap on a side where the Oldham ring approaches the recess wall surface through the oil relief groove, thereby reducing a compressor input and a load on the Oldham ring.

[0016] A scroll compressor according to a second embodiment of the present invention is the scroll compressor according to the first embodiment, wherein an upper surface of the Oldham ring is provided with a pair of fixed scroll-side key parts that slide with respect to a fixed scroll and a pair of orbiting scroll-side key parts that slide with respect to an orbiting scroll, an Oldham ring lower surface groove is provided as the oil relief groove, and the Oldham ring lower surface groove is formed on the recess thrust surface where the pair of fixed scroll-side key parts are located. According to this embodiment, when the Oldham ring moves, the lubricant oil existing in the decreasing outer peripheral gap can be moved to the inner peripheral space of the Oldham ring through the Oldham ring lower surface groove.

[0017] A scroll compressor according to a third embodiment of the present invention is the scroll compressor according to the first embodiment, wherein a ring groove is provided as the oil relief groove, and the ring groove is formed on an outer circumference of the recess thrust surface. According to this embodiment, when the Oldham ring moves, the lubricant oil existing in the decreasing outer peripheral gap can be moved to an expanding gap on the side where the Oldham ring separates from the recess wall surface through the ring groove.

[0018] A scroll compressor according to a fourth embodiment of the present invention is the scroll compressor according to the first embodiment, wherein an upper surface of the Oldham ring is provided with a pair of fixed scroll-side key parts that slide with respect to the fixed scroll and a pair of orbiting scroll-side key parts that slide with respect to the orbiting scroll, a communication groove is provided as the oil relief groove, and the communication groove is formed on the recess thrust surface where the pair of fixed scroll-side key parts are not located. According to this embodiment, when the Oldham ring moves, the lubricant oil existing in the decreasing outer peripheral gap can be moved to the inner peripheral space of the Oldham ring through the communication groove.

[0019] A scroll compressor according to a fifth embodiment of the present invention is the scroll compressor according to the second embodiment, wherein a radial lower surface groove width of the Oldham ring lower surface groove is formed larger than a radial fixed scroll-side key part width of the Oldham ring where the fixed scroll-side key parts are located. According to this embodiment, the lubricant oil existing in the decreasing outer peripheral gap can be smoothly moved to the inner peripheral space of the Oldham ring.

[0020] A scroll compressor according to a sixth embodiment of the present invention is the scroll compressor according to the third embodiment, wherein the ring groove is formed along a recess wall surface. According to this embodiment, the lubricant oil existing in the decreasing outer peripheral gap can be smoothly moved to the expanding gap on the side where the Oldham ring separates from the recess wall surface.

[0021] A scroll compressor according to a seventh embodiment of the present invention is the scroll compressor according to the fourth embodiment, wherein a plurality of communication grooves are arranged symmetrically with respect to a virtual X-axis line passing through the pair of fixed scroll-side key parts. According to this embodiment, the lubricant oil existing in the decreasing outer peripheral gap can be smoothly moved to the inner peripheral space of the Oldham ring.[EMBODIMENTS]

[0022] The following describes a scroll compressor according to an embodiment of the present invention. It should be noted that the present invention is not limited to the following embodiments.

[0023] Fig. 1 is a vertical sectional view of the scroll compressor according to the embodiment.

[0024] Inside a hermetical container 1, a compression mechanism 10 for compressing refrigerant, an electric mechanism 20 for driving the compression mechanism 10, and a main shaft 30 that rotates by the electric mechanism 20 to operate the compression mechanism 10 are arranged.

[0025] The hermetical container 1 is composed of a cylindrically formed body portion 1a extending in a vertical direction, an upper lid 1c for closing an upper opening of the body portion 1a, and a lower lid 1b for closing a lower opening of the body portion 1a.

[0026] The hermetical container 1 is provided with a refrigerant sucking pipe 2 for introducing refrigerant into the compression mechanism 10 and a refrigerant discharge pipe 3 for discharging refrigerant compressed by the compression mechanism 10 to the outside of the hermetical container 1.

[0027] The compression mechanism 10 includes a fixed scroll 11 and an orbiting scroll 12. The orbiting scroll 12 is orbitally driven by the main shaft 30.

[0028] The electric mechanism 20 includes a stator 21 fixed to the hermetical container 1 and a rotor 22 arranged inside the stator 21. The main shaft 30 is fixed to the rotor 22.

[0029] Below the fixed scroll 11 and the orbiting scroll 12, a main bearing 40 for supporting the fixed scroll 11 and the orbiting scroll 12 is provided.

[0030] The main bearing 40 is formed with a bearing 41 for supporting the main shaft 30, a boss-accommodating section 42, a seal ring recess 43, and an Oldham ring recess 45. The main bearing 40 is fixed to the hermetical container 1 by welding or shrink fitting.

[0031] The fixed scroll 11 includes a disk-shaped fixed scroll end plate 11a, a fixed spiral wrap 11b standing on the fixed scroll end plate 11a, and an outer peripheral wall 11c standing so as to surround the circumference of the fixed spiral wrap 11b, and a discharge port 14 is formed in a substantially central portion of the fixed scroll end plate 11a.

[0032] The orbiting scroll 12 includes a disk-shaped orbiting scroll end plate 12a, an orbiting spiral wrap 12b standing on a lap side end surface of the orbiting scroll end plate 12a, and a cylindrical boss section 12c formed on the side opposite to the lap side end surface of the orbiting scroll end plate 12a.

[0033] The fixed spiral wrap 11b of the fixed scroll 11 and the orbiting spiral wrap 12b of the orbiting scroll 12 are meshed with each other, and a plurality of compression chambers 15 are formed between the fixed spiral wrap 11b and the orbiting spiral wrap 12b.

[0034] The boss section 12c is formed on a substantially central portion of the orbiting scroll end plate 12a. The boss section 12c is accommodated in the boss-accommodating section 42.

[0035] The main shaft 30 is formed with a journal portion 31 arranged in the bearing 41, an eccentric shaft 32 inserted into the boss section 12c, and a main shaft oil supply hole 34 extending from a lower end portion 33 of the main shaft 30 to an upper end portion of the eccentric shaft 32. The eccentric shaft 32 is formed at an upper end of the main shaft 30, and the journal portion 31 is formed below the eccentric shaft 32.

[0036] The fixed scroll 11 is fixed to the main bearing 40 using a plurality of bolts 16 at the outer peripheral wall 11c. On the other hand, the orbiting scroll 12 is supported by the fixed scroll 11 through an Oldham ring 17. The Oldham ring 17, which restrains self-rotation of the orbiting scroll 12, is placed in the Oldham ring recess 45 and is provided between the fixed scroll 11 and the main bearing 40. As a result, the orbiting scroll 12 performs orbital movement with respect to the fixed scroll 11 without self-rotation.

[0037] The lower end portion 33 of the main shaft 30 is supported by an auxiliary bearing 18 arranged in a lower portion of the hermetical container 1.

[0038] An oil reservoir 4 for storing lubricant oil is formed in a bottom of the hermetical container 1.

[0039] A volumetric oil pump 5 is provided at a lower end of the main shaft 30. The oil pump 5 is arranged so that its suction port is located in the oil reservoir 4. The oil pump 5 is driven by the main shaft 30. The oil pump 5 can reliably suck up the lubricant oil in the oil reservoir 4 provided in the bottom of the hermetical container 1 regardless of pressure conditions or operating speed, so there is no worry about running out of the oil.

[0040] The lubricant oil sucked up by the oil pump 5 is supplied to a bearing of the auxiliary bearing 18, the bearing 41, the boss section 12c, and the upper end portion of the eccentric shaft 32 through the main shaft oil supply hole 34 formed in the main shaft 30.

[0041] A first oil passage 51 and a second oil passage 52 are formed in the orbiting scroll end plate 12a. The first oil passage 51 intermittently communicates a space between the upper end portion of the eccentric shaft 32 and the orbiting scroll end plate 12a with the Oldham ring recess 45. The second oil passage 52 intermittently communicates the Oldham ring recess 45 with a refrigerant sucking space on the outer periphery of the orbiting scroll end plate 12a.

[0042] The space between the upper end portion of the eccentric shaft 32 and the orbiting scroll end plate 12a is a high-pressure space at discharge pressure of the refrigerant, and the Oldham ring recess 45 is an intermediate pressure space lower than the discharge pressure of the refrigerant but higher than sucking pressure of the refrigerant.

[0043] Therefore, the lubricant oil in the space between the upper end portion of the eccentric shaft 32 and the orbiting scroll end plate 12a is supplied to the Oldham ring recess 45 through the first oil passage 51. Then, the lubricant oil in the Oldham ring recess 45 is supplied to the refrigerant sucking space on the outer periphery of the orbiting scroll end plate 12a through the second oil passage 52.

[0044] The refrigerant sucked from the refrigerant sucking pipe 2 is led to the compression chamber 15 from a sucking port 15a. The compression chamber 15 moves from the outer circumferential side toward the central portion while reducing their volume, and the refrigerant that has reached a predetermined pressure in the compression chamber 15 is discharged into a discharge chamber 6 from the discharge port 14 provided in a central portion of the fixed scroll 11. A discharge valve (not shown) is provided at the discharge port 14. The refrigerant that has reached the predetermined pressure in the compression chamber 15 pushes open the discharge valve and is discharged into the discharge chamber 6. The refrigerant discharged into the discharge chamber 6 is led out to an upper portion inside the hermetical container 1, passes through a refrigerant passage (not shown) formed in the compression mechanism 10, reaches around the electric mechanism 20, and is discharged from the refrigerant discharge pipe 3.

[0045] In the scroll compressor of this embodiment, the boss-accommodating section 42 is a high-pressure region, and an outer peripheral portion of the orbiting scroll 12 where the Oldham ring 17 is placed is an intermediate pressure region, and the orbiting scroll 12 is pushed against the fixed scroll 11 by the pressure of the high-pressure region and the intermediate pressure region.

[0046] The eccentric shaft 32 is inserted into the boss section 12c in an orbitally drivable manner through an orbital bearing. An oil groove 38 is formed on the outer circumferential surface of the eccentric shaft 32.

[0047] The seal ring recess 43 is formed on a thrust surface of the main bearing 40 that receives a thrust force of the orbiting scroll end plate 12a. A ring-shaped seal member is provided in the seal ring recess 43. The seal member is arranged on an outer circumference of the boss-accommodating section 42.

[0048] The inside of the hermetical container 1 is filled with high-pressure refrigerant at the same pressure as the refrigerant discharged into the discharge chamber 6, and since the main shaft oil supply hole 34 opens at the upper end portion of the eccentric shaft 32, the pressure in the space between the upper end portion of the eccentric shaft 32 and the orbiting scroll end plate 12a becomes the high-pressure region equivalent to the pressure of the discharged refrigerant.

[0049] The lubricant oil introduced into the boss section 12c through the main shaft oil supply hole 34 is supplied to the orbital bearing and the boss-accommodating section 42 by the oil groove 38 formed on the outer circumferential surface of the eccentric shaft 32. Since the seal member is provided on the outer circumference of the boss-accommodating section 42, the boss-accommodating section 42 is the high-pressure region.

[0050] Fig. 2 are perspective views showing the Oldham ring in Fig. 1, where Fig. 2(a) shows an upper surface of the Oldham ring and Fig. 2(b) shows a lower surface of the Oldham ring.

[0051] The upper surface of the Oldham ring 17 is provided with a pair of fixed scroll-side key parts 17a that slide with respect to the fixed scroll 11, and a pair of orbiting scroll-side key parts 17b that slide with respect to the orbiting scroll 12. Key grooves (not shown) in which the pair of fixed scroll-side key parts 17a slide are formed in the fixed scroll end plate 11a, and key grooves (not shown) in which the pair of orbiting scroll-side key parts 17b slide are formed in the orbiting scroll end plate 12a.

[0052] A virtual X-axis line passing through the pair of fixed scroll-side key parts 17a intersects perpendicularly with a virtual Y-axis line passing through the pair of orbiting scroll-side key parts 17bb.

[0053] A plurality of Oldham ring thrust parts 17c are formed on the lower surface of the Oldham ring 17.

[0054] Fig. 3 are diagrams showing the main bearing of the scroll compressor in Fig. 1, where Fig. 3(a) is a perspective view of the main bearing, Fig. 3(b) is a top view of the main bearing, and Fig. 3(c) is a sectional view taken along line A-A in Fig. 3(b).

[0055] The Oldham ring recess 45 is formed on an upper surface of the main bearing 40, and an oil relief groove 60 is formed on a recess thrust surface 45a of the Oldham ring recess 45. The oil relief groove 60 is formed lower than the recess thrust surface 45a.

[0056] In this embodiment, an Oldham ring lower surface groove 61 and a ring groove 62 are provided as the oil relief groove 60. The ring groove 62 is formed on the outer circumference of the recess thrust surface 45a. In this embodiment, the ring groove 62 is formed along a recess wall surface 45b.

[0057] Fig. 4 are diagrams showing the main bearing and the Oldham ring of the scroll compressor in Fig. 1, where Fig. 4(a) is a perspective view and Fig. 4(b) is a top view.

[0058] The Oldham ring 17 is placed in the Oldham ring recess 45.

[0059] The Oldham ring lower surface groove 61 is formed on the recess thrust surface 45a where the pair of fixed scroll-side key parts 17a are located.

[0060] The Oldham ring lower surface groove 61 may be a rectangular groove or an inclined groove, and a bottom of the groove may be formed in an R shape.

[0061] A radial lower surface groove width 61L of the Oldham ring lower surface groove 61 is formed larger than a radial fixed scroll-side key part width 17L of the Oldham ring 17 where the fixed scroll-side key parts 17a are located.

[0062] The Oldham ring 17 reciprocates in a direction of a virtual X-axis line with respect to the main bearing 40.

[0063] By providing the Oldham ring lower surface groove 61, as shown in Fig. 4(b), when the Oldham ring 17 moves in a direction of arrow B, lubricant oil existing in a decreasing outer peripheral gap S1 on the side where the Oldham ring 17 approaches the recess wall surface 45b can be moved to an inner peripheral space S2 of the Oldham ring 17 through the Oldham ring lower surface groove 61.

[0064] By forming the radial lower surface groove width 61L larger than the radial fixed scroll-side key part width 17L, the lubricant oil existing in the decreasing outer peripheral gap S1 can be smoothly moved to the inner peripheral space S2 of the Oldham ring 17.

[0065] Moreover, by providing the ring groove 62, as shown in Fig. 4(b), when the Oldham ring 17 moves in the direction of the arrow B, the lubricant oil existing in the decreasing outer peripheral gap S1 on the side where the Oldham ring 17 approaches the recess wall surface 45b can be moved to an expanding gap S3 on the side where the Oldham ring 17 separates from the recess wall surface 45b through the ring groove 62.

[0066] By forming the ring groove 62 along the recess wall surface 45b, the lubricant oil existing in the decreasing outer peripheral gap S1 can be smoothly moved to the expanding gap S3 on the side where the Oldham ring 17 separates from the recess wall surface 45b.

[0067] Thus, by providing the oil relief groove 60 consisting of at least one of the Oldham ring lower surface groove 61 and the ring groove 62, when the Oldham ring 17 moves, the lubricant oil existing in the decreasing outer peripheral gap S1 on the side where the Oldham ring 17 approaches the recess wall surface 45b can be moved through the oil relief groove 60, thereby mitigating oil compression by the lubricant oil existing in the decreasing outer peripheral gap S1, and it is possible to reduce a compressor input and a load on the Oldham ring 17.

[0068] Fig. 5 are sectional views showing a main bearing according to an another embodiment of the present invention, where Fig. 5(b) is an enlarged sectional view of an essential part of Fig. 5(a).

[0069] The ring groove 62 shown in Fig. 5 has an R-shaped bottom. The ring groove 62 may be rectangular or an inclined groove.

[0070] Fig. 6 are plan views showing a main bearing according to yet other embodiments of the present invention.

[0071] Each of Hatched areas E in Fig. 6(a) to 6(c) shows a mounting surface on which an Oldham ring thrust part 17c slides.

[0072] In each embodiment shown in Fig. 6, a communication groove 63 is provided as an oil relief groove 60.

[0073] The communication groove 63 is formed on a recess thrust surface 45a where a pair of fixed scroll-side key parts 17a are not located.

[0074] A communication groove 63a shown in Fig. 6(a) has a circular groove shape, a communication groove 63b shown in Fig. 6(b) has a horizontally elongated groove shape, and a communication groove 63c shown in Fig. 6(c) has an elliptical groove shape.

[0075] These communication grooves 63 (63a to 63c) may be rectangular grooves or inclined grooves. It is preferable to form the communication groove 63 avoiding the mounting surface (hatched area E) on which the Oldham ring thrust parts 17c slide.

[0076] The communication groove 63 may be formed as the oil relief groove 60 instead of an Oldham ring lower surface groove 61 and a ring groove 62, or it may be formed together with at least one of the Oldham ring lower surface groove 61 and the ring groove 62.

[0077] By providing the communication groove 63, as shown in Fig. 4(b), when an Oldham ring 17 moves in a direction of arrow B, lubricant oil existing in a decreasing outer peripheral gap S1 on the side where the Oldham ring 17 approaches a recess wall surface 45b can be moved to an inner peripheral space S2 of the Oldham ring 17 through the communication groove 63.

[0078] Moreover, as shown in Fig. 6(a) to 6(c), by arranging a plurality of communication grooves 63 symmetrically with respect to a virtual X-axis line passing through the pair of fixed scroll-side key parts 17a, the lubricant oil existing in the decreasing outer peripheral gap S1 can be smoothly moved to the inner peripheral space S2 of the Oldham ring 17.

[0079] Fig. 7 is a plan view showing a main bearing according to yet another embodiment of the present invention.

[0080] In the embodiment shown in Fig. 7, an Oldham ring lower surface groove 61, a ring groove 62, and a communication groove 63a are provided as an oil relief groove 60.

[0081] The Oldham ring lower surface groove 61 and the ring groove 62 are the same as those shown in Fig. 3, and the communication groove 63a is the same as that shown in Fig. 6(a).

[0082] It should be noted that in Fig. 7, a circular communication groove 63a shown in Fig. 6(a) is provided, but a horizontally elongated communication groove 63b shown in Fig. 6(b) or an elliptical communication groove 63c shown in Fig. 6(c) may be provided instead of the circular communication groove 63a shown in Fig. 6(a).[INDUSTRIAL APPLICABILITY]

[0083] The scroll compressor of the present invention is useful in a refrigeration cycle device such as a hydronic heater, an air conditioner, a hot water supply device and a freezer.[EXPLANATION OF SYMBOLS]

[0084] 1 hermetical container 1a body portion 1b lower lid 1c upper lid 2 refrigerant sucking pipe 3 refrigerant discharge pipe 4 oil reservoir 5 oil pump 6 discharge chamber 10 compression mechanism 11 fixed scroll 11a fixed scroll end plate 11b fixed spiral wrap 11c outer peripheral wall 12 orbiting scroll 12a orbiting scroll end plate 12b orbiting spiral wrap 12c boss section 14 discharge port 15 compression chamber 15a sucking port 16 bolt 17 Oldham ring 17a fixed scroll-side key part 17b orbiting scroll-side key part 17c Oldham ring thrust part 17L radial fixed scroll-side key part width 18 auxiliary bearing 20 electric mechanism 21 stator 22 rotor 30 main shaft 31 journal portion 32 eccentric shaft 33 lower end portion 34 main shaft oil supply hole 38 oil groove 40 main bearing 41 bearing 42 boss-accommodating section 43 seal ring recess 45 Oldham ring recess 45a recess thrust surface 45b recess wall surface 51 first oil passage 52 second oil passage 60 oil relief groove 61 Oldham ring lower surface groove 61L radial lower surface groove width 62 ring groove 63, 63a, 63b, 63c communication groove E hatched area S1 outer peripheral gap S2 inner peripheral space S3 gap

Claims

1. A scroll compressor comprising a hermetical container in which a compression mechanism for compressing refrigerant, an electric mechanism for driving the compression mechanism, and a main shaft that rotates by the electric mechanism to operate the compression mechanism are arranged; Wherein; an oil reservoir is formed in a bottom of the hermetical container; the compression mechanism comprises a fixed scroll and an orbiting scroll; the fixed scroll comprises a disk-shaped fixed scroll end plate and a fixed spiral wrap standing on the fixed scroll end plate, the orbiting scroll comprises a disk-shaped orbiting scroll end plate, an orbiting spiral wrap standing on a lap side end surface of the orbiting scroll end plate, and a boss section formed on a side opposite to the lap side end surface of the orbiting scroll end plate, the fixed spiral wrap and the orbiting spiral wrap are meshed with each other to form a plurality of compression chambers between the fixed spiral wrap and the orbiting spiral wrap, a main bearing for supporting the fixed scroll and the orbiting scroll is provided below the fixed scroll and the orbiting scroll, an Oldham ring for restraining self-rotation of the orbiting scroll is provided between the main bearing and the fixed scroll, the main bearing is formed with a bearing for supporting the main shaft, a boss-accommodating section for accommodating the boss section, and an Oldham ring recess for placing the Oldham ring, the main shaft has an oil supply hole extending from a lower end portion to an upper end portion, lubricant oil in the oil reservoir is guided through the oil supply hole to the Oldham ring recess, wherein an oil relief groove is formed on a recess thrust surface of the Oldham ring recess.

2. The scroll compressor according to claim 1, wherein an upper surface of the Oldham ring is provided with a pair of fixed scroll-side key parts that slide with respect to the fixed scroll and a pair of orbiting scroll-side key parts that slide with respect to the orbiting scroll, an Oldham ring lower surface groove is provided as the oil relief groove, and the Oldham ring lower surface groove is formed on the recess thrust surface where the pair of fixed scroll-side key parts are located.

3. The scroll compressor according to claim 1, wherein a ring groove is provided as the oil relief groove, and the ring groove is formed on an outer circumference of the recess thrust surface.

4. The scroll compressor according to claim 1, wherein an upper surface of the Oldham ring is provided with a pair of fixed scroll-side key parts that slide with respect to the fixed scroll and a pair of orbiting scroll-side key parts that slide with respect to the orbiting scroll, a communication groove is provided as the oil relief groove, and the communication groove is formed on the recess thrust surface where the pair of fixed scroll-side key parts are not located.

5. The scroll compressor according to claim 2, wherein a radial lower surface groove width of the Oldham ring lower surface groove is formed larger than a radial fixed scroll-side key part width of the Oldham ring where the fixed scroll-side key parts are located.

6. The scroll compressor according to claim 3, wherein the ring groove is formed along a recess wall surface.

7. The scroll compressor according to claim 4, wherein a plurality of communication grooves are arranged symmetrically with respect to a virtual X-axis line passing through the pair of fixed scroll-side key parts.

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