Scroll compressor and refrigeration device

Abstract

To ensure a sufficient amount of oil to be supplied to a compression chamber without changing the volume of a movable-side oil groove. [Solution] During orbital movement of the movable scroll (70), the position of the movable oil groove (75) switches between a first state and a second state. In the first state, the movable oil groove (75) is separated from the compression chamber (S) and communicates with the fixed oil groove (80). In the second state, the movable oil groove (75) communicates with the compression chamber (S) and is separated from the fixed oil groove (80). In both the first and second states, the movable oil groove (75) communicates with an oil reservoir groove (85).

Description

[Technical Field]

[0001] The present disclosure relates to a scroll compressor and a refrigeration device. [Background technology]

[0002] Patent Document 1 discloses a scroll compressor in which oil is supplied from the fixed-side oil groove of the fixed scroll to the movable-side oil groove of the movable scroll during orbital movement of the movable scroll, and then the movable-side oil groove is connected to the compression chamber, thereby supplying oil from the movable-side oil groove to the compression chamber. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5954453 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to ensure a sufficient amount of oil is supplied to the compression chamber, it is possible to consider increasing the volume of the movable oil groove, but due to the dimensional constraints of the movable scroll, it is difficult to increase the length or width of the movable oil groove.

[0005] An object of the present disclosure is to ensure a sufficient amount of oil to be supplied to the compression chamber without changing the volume of the movable-side oil groove. [Means for solving the problem]

[0006] A first aspect of the present disclosure is a compressor including a fixed scroll (60) having a fixed wrap (62), and a movable scroll (70) having a movable wrap (72) that meshes with the fixed wrap (62) to form a compression chamber (S), wherein a fixed oil groove (80) to which oil is supplied and an oil storage groove (85) disposed away from the fixed oil groove (80) are provided on a surface of the fixed scroll (60) facing the movable scroll (70), and ), a movable-side oil groove (75) is provided on a surface facing the fixed-side oil groove (80), and during the orbiting movement of the movable scroll (70), the position of the movable-side oil groove (75) switches between a first state in which the movable-side oil groove (75) is separated from the compression chamber (S) and communicates with the fixed-side oil groove (80), and a second state in which the movable-side oil groove (75) communicates with the compression chamber (S) and is separated from the fixed-side oil groove (80), and in the first state and the second state, the movable-side oil groove (75) communicates with the oil reservoir groove (85).

[0007] In the first mode, in the first state, oil is supplied from the fixed-side oil groove (80) to the oil storage groove (85), and in the second state, the oil in the oil storage groove (85) is supplied to the compression chamber (S) in addition to the oil in the movable-side oil groove (75), thereby ensuring a sufficient amount of oil to be supplied to the compression chamber (S) without changing the volume of the movable-side oil groove (75).

[0008] Furthermore, by changing the depth of the oil reservoir groove (85) to adjust the amount of oil stored therein, it is possible to adjust the amount of oil supplied to the compression chamber (S).

[0009] A second aspect of the present disclosure is the scroll compressor of the first aspect, wherein the period during which the compressor is in the first state is longer than the period during which the compressor is in the second state.

[0010] In the second mode, the period in which the oil is in the first state is longer than the period in which the oil is in the second state, so that oil can be appropriately supplied from the fixed-side oil groove (80) to the oil storage groove (85).

[0011] A third aspect of the present disclosure is a scroll compressor of the first or second aspect, wherein the compression chamber (S) has a first compression chamber (S1) formed by being surrounded by the outer peripheral surface of the movable side wrap (72) and the inner peripheral surface of the fixed side wrap (62), and a second compression chamber (S2) formed by being surrounded by the inner peripheral surface of the movable side wrap (72) and the outer peripheral surface of the fixed side wrap (62), and in the second state, the movable side oil groove (75) is connected to the first compression chamber (S1).

[0012] In the third aspect, oil can be supplied from the movable oil groove (75) to the first compression chamber (S1).

[0013] A fourth aspect of the present disclosure is a scroll compressor according to the first or second aspect, wherein the fixed scroll (60) has an intake port (64) that opens to the end of the winding of the fixed side wrap (62) and communicates with the compression chamber (S), and in the second state, the movable side oil groove (75) communicates with the compression chamber (S) via the intake port (64).

[0014] In the fourth aspect, oil can be supplied from the movable oil groove (75) to the compression chamber (S) through the suction port (64).

[0015] A fifth aspect of the present disclosure is a scroll compressor of the fourth aspect, wherein the compression chamber (S) has a first compression chamber (S1) formed by being surrounded by the outer peripheral surface of the movable side wrap (72) and the inner peripheral surface of the fixed side wrap (62), and a second compression chamber (S2) formed by being surrounded by the inner peripheral surface of the movable side wrap (72) and the outer peripheral surface of the fixed side wrap (62), and the movable scroll (70) switches to the second state at a rotation angle at which refrigerant flows from the suction port (64) into at least one of the first compression chamber (S1) and the second compression chamber (S2).

[0016] In the fifth aspect, the oil supplied from the movable oil groove (75) to the suction port (64) can be supplied to at least one of the first compression chamber (S1) and the second compression chamber (S2).

[0017] A sixth aspect of the present disclosure relates to the scroll compressor of the fifth aspect, wherein the movable scroll (70) switches to the second state at an orbital angle at which refrigerant flows from the suction port (64) into the second compression chamber (S2).

[0018] In the sixth aspect, the oil supplied from the movable oil groove (75) to the suction port (64) can be made to flow into the second compression chamber (S2).

[0019] A seventh aspect of the present disclosure is the scroll compressor of the first or second aspect, wherein the fixed scroll (60) has a suction port (64) that opens at a winding end side of the fixed side wrap (62) and communicates with the compression chamber (S), and the compression chamber (S) includes a first compression chamber (S1) that is surrounded by an outer peripheral surface of the movable side wrap (72) and an inner peripheral surface of the fixed side wrap (62), and a second compression chamber (S2) that is surrounded by an inner peripheral surface of the movable side wrap (72) and the and an outer peripheral surface of the fixed-side wrap (62), and a second compression chamber (S2) formed by being surrounded by the outer peripheral surface of the fixed-side wrap (62), the movable-side oil groove (75) includes a first movable-side oil groove (76) and a second movable-side oil groove (77) arranged apart from the first movable-side oil groove (76), the oil retention groove (85) includes a first oil retention groove (86) communicating with the first movable-side oil groove (76) and a second oil retention groove (87) communicating with the second movable-side oil groove (77), During the orbital movement of the orbiting scroll (70), the position of the orbiting oil groove (75) is changed to one of the first state in which the first orbiting oil groove (76) is separated from the first compression chamber (S1) and communicates with the fixed-side oil groove (80), the second state in which the first orbiting oil groove (76) is communicated with the first compression chamber (S1) and separated from the fixed-side oil groove (80), and the third state in which the second orbiting oil groove (77) is separated from the suction port (64) and communicates with the fixed-side oil groove (80). and a fourth state in which the second movable-side oil groove (77) communicates with the compression chamber (S) via the suction port (64) and is separated from the fixed-side oil groove (80). In the first and second states, the first movable-side oil groove (76) communicates with the first oil reservoir groove (86), and in the third and fourth states, the second movable-side oil groove (77) communicates with the second oil reservoir groove (87).

[0020] In the seventh aspect, in addition to the oil supplied from the first movable-side oil groove (76) to the first compression chamber (S1), oil is supplied from the second movable-side oil groove (77) to the compression chamber (S) via the suction port (64), thereby making it possible to adjust the amount of oil supplied to the compression chamber (S).

[0021] An eighth aspect of the present disclosure is the scroll compressor of the seventh aspect, wherein the orbiting angle of the movable scroll (70) in the second state is different from the orbiting angle of the movable scroll (70) in the fourth state.

[0022] In the eighth aspect, the supply of oil from the first movable-side oil groove (76) to the first compression chamber (S1) and the supply of oil from the second movable-side oil groove (77) to the compression chamber (S) via the suction port (64) can be performed at appropriate timing.

[0023] A ninth aspect of the present disclosure is a refrigeration system including the scroll compressor (10) of any one of the first to eighth aspects.

[0024] In a ninth aspect, a refrigeration system including the scroll compressor (10) can be provided. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a refrigerant circuit diagram showing the configuration of the refrigeration device of the first embodiment. [Figure 2] FIG. 2 is a vertical cross-sectional view showing the configuration of the scroll compressor. [Figure 3] FIG. 3 is a bottom view showing the configuration of the fixed scroll. [Figure 4] FIG. 4 is a plan view showing the configuration of the movable scroll. [Figure 5] FIG. 5 is a diagram showing the position of the first movable-side oil groove in the first state. [Figure 6] FIG. 6 is a diagram showing the position of the first movable-side oil groove in the second state. [Figure 7] FIG. 7 is a diagram showing the position of the second movable-side oil groove in the first state of the second embodiment. [Figure 8] FIG. 8 is a diagram showing the position of the second movable-side oil groove in the second state. [Figure 9] FIG. 9 is a diagram showing the position of the first movable-side oil groove in the first state of the third embodiment. [Figure 10] FIG. 10 is a diagram showing the position of the first movable-side oil groove in the second state. [Figure 11] FIG. 11 is a diagram showing the position of the second movable-side oil groove in the third state. [Figure 12] FIG. 12 is a diagram showing the position of the second movable-side oil groove in the fourth state. DETAILED DESCRIPTION OF THE INVENTION

[0026] First Embodiment As shown in Fig. 1, the scroll compressor (10) is provided in a refrigeration system (1). The refrigeration system (1) has a refrigerant circuit (1a) filled with a refrigerant. The refrigerant circuit (1a) has the scroll compressor (10), a radiator (3), a pressure reduction mechanism (4), and an evaporator (5). The pressure reduction mechanism (4) is, for example, an expansion valve. The refrigerant circuit (1a) performs a vapor compression refrigeration cycle.

[0027] The refrigeration system (1) is an air conditioner. The air conditioner may be a cooling-only unit, a heating-only unit, or an air conditioner that switches between cooling and heating. In this case, the air conditioner has a switching mechanism (e.g., a four-way switching valve) that switches the refrigerant circulation direction. The refrigeration system (1) may be a water heater, a chiller unit, a cooling device that cools the air inside a storage unit, or the like. A cooling device cools the air inside a refrigerator, a freezer, a container, or the like.

[0028] As shown in Fig. 2, the scroll compressor (10) includes a casing (20), a motor (30), and a compression mechanism (40). The casing (20) is formed in a vertically elongated cylindrical shape and is configured as a sealed dome. The casing (20) accommodates the motor (30) and the compression mechanism (40).

[0029] The motor (30) has a stator (31) and a rotor (32). The stator (31) is fixed to the inner circumferential surface of the casing (20). The rotor (32) is disposed inside the stator (31). The drive shaft (11) passes through the rotor (32). The rotor (32) is fixed to the drive shaft (11).

[0030] An oil reservoir (21) is provided at the bottom of the casing (20). Oil is stored in the oil reservoir (21). A suction pipe (12) is connected to the top of the casing (20). A discharge pipe (13) is connected to the body of the casing (20).

[0031] A housing (50) is fixed to the casing (20). The housing (50) is disposed above the motor (30). The compression mechanism (40) is disposed above the housing (50). The inlet end of the discharge pipe (13) is located between the motor (30) and the housing (50).

[0032] The housing 50 has a recess 53 formed therein. The recess 53 is formed by recessing a portion of the upper surface of the housing 50. An upper bearing 51 is provided below the recess 53.

[0033] The drive shaft (11) extends vertically along the central axis of the casing (20) and has a main shaft portion (14) and an eccentric portion (15).

[0034] The eccentric portion (15) is provided at the upper end of the main shaft portion (14). A lower portion of the main shaft portion (14) is rotatably supported by a lower bearing (22). The lower bearing (22) is fixed to the inner peripheral surface of the casing (20). A positive displacement pump (25), for example, is provided on the lower bearing (22). An upper portion of the main shaft portion (14) passes through the housing (50) and is rotatably supported by an upper bearing (51) of the housing (50).

[0035] The compression mechanism (40) includes a fixed scroll (60) and a movable scroll (70). The fixed scroll (60) is fixed to the upper surface of the housing (50). The movable scroll (70) is disposed between the fixed scroll (60) and the housing (50).

[0036] The fixed scroll (60) has a fixed end plate (61), a fixed side wrap (62), and an outer peripheral wall (63). The outer peripheral wall (63) is formed in a substantially cylindrical shape. The outer peripheral wall (63) stands on the outer edge of the front surface (the lower surface in FIG. 2 ) of the fixed end plate (61).

[0037] The fixed side wrap (62) is formed in a spiral shape and is provided upright inside the outer peripheral wall (63) of the fixed side end plate (61).

[0038] The fixed scroll end plate (61) is located on the outer periphery and is formed continuously with the fixed scroll wrap (62). The tip end surface of the fixed scroll wrap (62) and the tip end surface of the outer periphery wall (63) are formed to be substantially flush with each other. The fixed scroll (60) is fixed to the housing (50).

[0039] The movable scroll (70) has a movable end plate (71), a movable lap (72), and a boss portion (73). The movable lap (72) is formed in a spiral shape. The movable lap (72) is formed on the upper surface of the movable end plate (71). The movable lap (72) meshes with the fixed lap (62).

[0040] The boss portion (73) is formed at the center of the lower surface of the movable-side end plate (71). The eccentric portion (15) of the drive shaft (11) is inserted into the boss portion (73), and the drive shaft (11) is connected to the boss portion (73). An annular recess is provided in the upper portion of the housing (50) radially outward of the recess (53). A back pressure chamber (43) is defined by the annular recess in the upper portion of the housing (50), the fixed scroll (60), and the movable scroll (70).

[0041] The back pressure chamber (43) is supplied with intermediate-pressure refrigerant from the compression chamber (S) in the middle of compression. The back pressure chamber (43) is in an atmosphere of intermediate pressure between the suction pressure and discharge pressure of the compression chamber (S). The intermediate pressure of the back pressure chamber (43) acts on the back surface of the orbiting scroll (70).

[0042] The compression mechanism (40) has a compression chamber (S) into which a refrigerant flows. The compression chamber (S) is formed between a fixed scroll (60) and a movable scroll (70). The movable scroll (70) is disposed so that its movable wrap (72) meshes with the fixed wrap (62) of the fixed scroll (60). The lower surface of the outer peripheral wall (63) of the fixed scroll (60) faces the movable scroll (70). The upper surface of the movable end plate (71) of the movable scroll (70) faces the fixed scroll (60).

[0043] An intake port (64) is formed in the outer peripheral wall (63) of the fixed scroll (60). The intake port (64) opens at the winding end side of the fixed side wrap (62). The downstream end of the intake pipe (12) is connected to the intake port (64). The intake port (64) communicates with the compression chamber (S).

[0044] The compression chamber (S) is divided into a first compression chamber (S1) radially outward from the movable scroll (70) and a second compression chamber (S2) radially inward from the movable scroll (70). Specifically, when the inner peripheral surface of the outer peripheral wall (63) of the fixed scroll (60) and the outer peripheral surface of the movable side wrap (72) of the movable scroll (70) are substantially in contact with each other, the first compression chamber (S1) and the second compression chamber (S2) are separated from each other across the contact portion (see, for example, FIG. 5).

[0045] The first compression chamber (S1) is defined by the outer peripheral surface of the movable side wrap (72) and the inner peripheral surface of the fixed side wrap (62). The second compression chamber (S2) is defined by the inner peripheral surface of the movable side wrap (72) and the outer peripheral surface of the fixed side wrap (62).

[0046] A discharge port (65) is formed in the center of the fixed end plate (61) of the fixed scroll (60). The discharge port (65) opens in the upper surface of the fixed end plate (61) of the fixed scroll (60). The high-pressure gas refrigerant discharged from the discharge port (65) flows into the lower space (24) through a passage (not shown) formed in the housing (50).

[0047] An oil supply passage (16) is formed inside the drive shaft (11). The oil supply passage (16) extends vertically from the lower end to the upper end of the drive shaft (11). The lower end of the drive shaft (11) is connected to a pump (25). The lower end of the pump (25) is immersed in an oil reservoir (21). As the drive shaft (11) rotates, the pump (25) draws up oil from the oil reservoir (21) and delivers it to the oil supply passage (16). The oil supply passage (16) supplies oil from the oil reservoir (21) to the sliding surfaces between the lower bearing (22) and the drive shaft (11), the sliding surfaces between the upper bearing (51) and the drive shaft (11), and the sliding surfaces between the boss portion (73) and the drive shaft (11). The oil supply passage (16) opens to the upper end surface of the drive shaft (11) and supplies oil to the upper part of the drive shaft (11).

[0048] The recess (53) of the housing (50) communicates with the oil supply passage (16) of the drive shaft (11) through the inside of the boss portion (73) of the movable scroll (70). When high-pressure oil is supplied to the recess (53), a high pressure corresponding to the discharge pressure of the compression mechanism (40) acts on the recess (53). The movable scroll (70) is pressed against the fixed scroll (60) by the high pressure of the recess (53) and the intermediate pressure of the back pressure chamber (43).

[0049] An oil passage (55) is formed inside the housing (50) and the fixed scroll (60). An inlet end of the oil passage (55) communicates with the recess (53) of the housing (50). An outlet end of the oil passage (55) opens to the opposing surface of the fixed scroll (60). The oil passage (55) supplies high-pressure oil in the recess (53) to the opposing surface between the movable end plate (71) of the movable scroll (70) and the outer peripheral wall (63) of the fixed scroll (60).

[0050] A primary passage (48) is formed in the lower surface of the outer peripheral wall (63) of the fixed scroll (60) (see FIG. 5). The primary passage (48) communicates with the compression chamber (S) in the intermediate pressure state.

[0051] A secondary passage (49) is formed in the outer periphery of the movable end plate (71) of the movable scroll (70) (see FIG. 5). The secondary passage (49) is a through-hole that passes through the movable end plate (71) in the vertical direction. The upper end of the secondary passage (49) intermittently communicates with the primary passage (48), and the lower end of the secondary passage (49) communicates with the back pressure chamber (43) between the movable scroll (70) and the housing (50). That is, intermediate-pressure refrigerant is intermittently supplied from the intermediate-pressure compression chamber (S) to the back pressure chamber (43), and the back pressure chamber (43) is maintained at a predetermined intermediate pressure.

[0052] <Fixed side oil groove and movable side oil groove> As shown in Figure 3, a fixed-side oil groove (80) and an oil storage groove (85) are formed on the surface (lower surface in Figure 2) of the outer peripheral wall (63) of the fixed scroll (60) facing the movable-side end plate (71) of the movable scroll (70).

[0053] The fixed-side oil groove (80) has a circumferential groove portion (81) and a wide portion (82). The circumferential groove portion (81) extends in the circumferential direction along the inner circumferential surface of the outer circumferential wall (63) of the fixed scroll (60). The circumferential groove portion (81) communicates with the oil passage (55). Oil is supplied to the circumferential groove portion (81) from the oil passage (55).

[0054] The wide portion 82 is provided at one end (the end in the clockwise direction in FIG. 3) of the circumferential groove 81. The wide portion 82 is formed to be wider in the radial direction than the groove width of the circumferential groove 81.

[0055] The oil retention groove (85) is disposed away from the fixed-side oil groove (80). In the example shown in Fig. 3, the oil retention groove (85) is a first oil retention groove (86). The first oil retention groove (86) is disposed at a position circumferentially away from one end of the fixed-side oil groove (80).

[0056] As shown in Fig. 4, a movable oil groove (75) is provided on the surface of the movable scroll (70) facing the fixed scroll (60). In the example shown in Fig. 4, the movable oil groove (75) is a first movable oil groove (76). The first movable oil groove (76) extends in the circumferential direction along the outer circumferential surface of the movable wrap (72).

[0057] - Driving operation - The basic operation of the scroll compressor (10) will be described. In Fig. 2, when the motor (30) is operated, the drive shaft (11) to which the rotor (32) is fixed is driven to rotate. The movable scroll (70) orbits around the axis of the drive shaft (11).

[0058] When the movable scroll (70) orbits, the refrigerant is compressed in the compression chamber (S). The high-pressure gas refrigerant compressed in the compression chamber (S) is discharged from the discharge port (65) and flows into the lower space (24) through a passage (not shown) formed in the housing (50). The high-pressure gas refrigerant in the lower space (24) is discharged to the outside of the casing (20) through the discharge pipe (13).

[0059] As the drive shaft (11) rotates, the high-pressure oil in the oil reservoir (21) is sucked up by the pump (25), flows upward through the oil supply passage (16) of the drive shaft (11), and flows out from the opening at the upper end of the eccentric portion (15) of the drive shaft (11) into the inside of the boss portion (73) of the movable scroll (70).

[0060] The oil supplied to the boss portion (73) flows out into the recessed portion (53) of the housing (50) through a gap between the eccentric portion (15) of the drive shaft (11) and the boss portion (73). As a result, the recessed portion (53) of the housing (50) is subjected to a high pressure corresponding to the discharge pressure of the compression mechanism (40). The high pressure in the recessed portion (53) and the intermediate pressure in the back pressure chamber (43) press the movable scroll (70) against the fixed scroll (60).

[0061] The high-pressure oil accumulated in the recess (53) flows through the oil passage (55) and into the fixed-side oil groove (80), thereby supplying the fixed-side oil groove (80) with high-pressure oil corresponding to the discharge pressure of the compression mechanism (40).

[0062] In the compression mechanism (40), the position of the first movable oil groove (76) switches between a first state and a second state during the orbital movement of the movable scroll (70).

[0063] <First state> When the movable scroll (70) is in the eccentric angular position shown in Fig. 5, for example, the first state is reached. In the first state, the first movable oil groove (76) is separated from the compression chamber (S) and communicates with the wide portion (82) of the fixed oil groove (80). Also, in the first state, the first movable oil groove (76) is communicated with the first oil reservoir groove (86).

[0064] As a result, in the first state, high-pressure oil flowing through the fixed-side oil groove (80) passes through the first movable-side oil groove (76) and flows into the first oil storage groove (86) (see the white arrows in FIG. 5). As a result, the first movable-side oil groove (76) and the first oil storage groove (86) are filled with high-pressure oil. In the first state, the first movable-side oil groove (76) is isolated from the compression chamber (S).

[0065] <Second state> When the movable scroll (70) in the eccentric angular position shown in Fig. 5 further orbits and reaches, for example, the eccentric angular position shown in Fig. 6, the second state is reached. In the second state, the first movable oil groove (76) communicates with the compression chamber (S) and is separated from the fixed oil groove (80). In addition, in the second state, the first movable oil groove (76) communicates with the first oil reservoir groove (86). In this embodiment, the period in the first state is longer than the period in the second state.

[0066] In this way, in the second state, the first movable-side oil groove (76) communicates with both the first compression chamber (S1) and the first oil storage groove (86). As a result, in the second state, in addition to the oil stored in the first movable-side oil groove (76), the oil stored in the first oil storage groove (86) is supplied to the first compression chamber (S1) via the first movable-side oil groove (76) (see the white arrows in FIG. 6).

[0067] -Effects of the first embodiment- According to this embodiment, in the first state, oil is supplied from the fixed-side oil groove (80) to the oil storage groove (85), and in the second state, the oil in the oil storage groove (85) is supplied to the compression chamber (S) in addition to the oil in the movable-side oil groove (75). This ensures a sufficient amount of oil to be supplied to the compression chamber (S) without changing the volume of the movable-side oil groove (75).

[0068] Furthermore, by changing the depth of the oil reservoir groove (85) to adjust the amount of oil stored therein, it is possible to adjust the amount of oil supplied to the compression chamber (S).

[0069] According to this embodiment, the period in which the oil is in the first state is longer than the period in which the oil is in the second state, so that oil can be appropriately supplied from the fixed-side oil groove (80) to the oil reservoir groove (85).

[0070] According to this embodiment, oil can be supplied from the movable oil groove (75) to the first compression chamber (S1).

[0071] According to the present embodiment, a refrigeration system including a scroll compressor (10) can be provided.

[0072] Second Embodiment Hereinafter, the same parts as those in the first embodiment will be denoted by the same reference numerals, and only the differences will be described.

[0073] As shown in FIG. 7, a fixed oil groove (80), an oil reservoir groove (85), and a communication groove (84) are formed on the surface of the fixed scroll (60) facing the movable scroll (70).

[0074] The fixed-side oil groove (80) has a circumferential groove portion (81) and a branch groove portion (83). The circumferential groove portion (81) extends in the circumferential direction along the inner circumferential surface of the outer circumferential wall (63) of the fixed scroll (60). One end portion (the clockwise end portion in FIG. 7) of the circumferential groove portion (81) extends to the vicinity of the winding end position of the fixed-side wrap (62). The other end portion (the counterclockwise end portion in FIG. 7) of the circumferential groove portion (81) extends to the vicinity of the primary-side passage (48). The branch groove portion (83) branches off from the circumferential groove portion (81) midway toward the end portion of the circumferential groove portion (81).

[0075] The oil retention groove (85) is disposed away from the fixed-side oil groove (80). In the example shown in Fig. 7, the oil retention groove (85) is a second oil retention groove (87). The second oil retention groove (87) is disposed at a position circumferentially away from the end of the branch groove portion (83).

[0076] The communication groove (84) communicates with the suction port (64). The communication groove (84) extends from the suction port (64) toward the second oil reservoir groove (87).

[0077] A movable-side oil groove (75) is provided on the surface of the movable scroll (70) facing the fixed scroll (60). In the example shown in Fig. 7, the movable-side oil groove (75) is a second movable-side oil groove (77). The second movable-side oil groove (77) extends in the circumferential direction along the outer circumferential surface of the movable-side wrap (72). The second movable-side oil groove (77) is located near the suction port (64).

[0078] In the compression mechanism (40), the position of the second movable oil groove (77) is switched between the first state and the second state during the orbital movement of the movable scroll (70).

[0079] <First state> When the movable scroll (70) is in the eccentric angle position shown in Fig. 7, for example, the first state is reached. In the first state, the second movable oil groove (77) is separated from the compression chamber (S) and communicates with the branch groove portion (83) of the fixed oil groove (80). Also, in the first state, the second movable oil groove (77) communicates with the second oil reservoir groove (87).

[0080] As a result, in the first state, high-pressure oil flowing through the fixed-side oil groove (80) passes through the second movable-side oil groove (77) and flows into the second oil storage groove (87) (see the white arrows in FIG. 7). As a result, the second movable-side oil groove (77) and the second oil storage groove (87) are filled with high-pressure oil. In the first state, the second movable-side oil groove (77) is isolated from the compression chamber (S).

[0081] <Second state> When the movable scroll (70) in the eccentric angle position shown in Fig. 7 further orbits and reaches, for example, the eccentric angle position shown in Fig. 8, the second state is reached. In the second state, the second movable oil groove (77) communicates with the compression chamber (S) via the communication groove (84) and the suction port (64) and is separated from the fixed oil groove (80). Also, in the second state, the second movable oil groove (77) communicates with the second oil reservoir groove (87).

[0082] In this way, in the second state, the second movable-side oil groove (77) communicates with both the compression chamber (S) and the second oil storage groove (87). As a result, in the second state, in addition to the oil stored in the second movable-side oil groove (77), the oil stored in the second oil storage groove (87) is supplied to the compression chamber (S) through the second movable-side oil groove (77), the communication groove (84), and the suction port (64) (see the white arrows in FIG. 8 ).

[0083] In the second state, the movable scroll (70) switches to the second state at an orbital angle at which refrigerant flows from the suction port (64) into at least one of the first compression chamber (S1) and the second compression chamber (S2). In the example shown in Fig. 8, the movable scroll (70) switches to the second state at an orbital angle at which refrigerant flows from the suction port (64) into the second compression chamber (S2).

[0084] The movable scroll (70) may be configured to switch to the second state at an orbital angle at which refrigerant flows from the suction port (64) into the first compression chamber (S1). Alternatively, the movable scroll (70) may be configured to switch to the second state at an orbital angle at which refrigerant flows from the suction port (64) into both the first compression chamber (S1) and the second compression chamber (S2).

[0085] -Effects of the second embodiment- According to this embodiment, oil can be supplied from the movable oil groove (75) to the compression chamber (S) through the suction port (64).

[0086] According to this embodiment, the oil supplied from the movable oil groove (75) to the suction port (64) can be supplied to at least one of the first compression chamber (S1) and the second compression chamber (S2).

[0087] According to this embodiment, the oil supplied from the movable oil groove (75) to the suction port (64) can flow into the second compression chamber (S2).

[0088] Third Embodiment As shown in FIG. 9, a fixed oil groove (80), an oil retention groove (85), and a communication groove (84) are formed on the surface of the fixed scroll (60) facing the movable scroll (70).

[0089] The fixed-side oil groove (80) has a circumferential groove portion (81), a wide portion (82), and a branched groove portion (83). The circumferential groove portion (81) extends in the circumferential direction along the inner peripheral surface of the outer peripheral wall (63) of the fixed scroll (60).

[0090] The wide portion (82) is provided at one end (clockwise end in FIG. 9 ) of the circumferential groove portion (81). The other end (counterclockwise end in FIG. 9 ) of the circumferential groove portion (81) extends to the vicinity of the primary passage (48). The branch groove portion (83) branches off from the circumferential groove portion (81) midway toward the other end of the circumferential groove portion (81).

[0091] The oil retention groove (85) is disposed away from the fixed-side oil groove (80). In the example shown in Fig. 9, the oil retention groove (85) includes a first oil retention groove (86) and a second oil retention groove (87). The first oil retention groove (86) is disposed at a position circumferentially spaced from one end of the fixed-side oil groove (80). The second oil retention groove (87) is disposed at a position circumferentially spaced from the end of the branch groove portion (83).

[0092] The communication groove (84) communicates with the suction port (64). The communication groove (84) extends from the suction port (64) toward the second oil reservoir groove (87).

[0093] A movable oil groove (75) is provided on the surface of the movable scroll (70) facing the fixed scroll (60). In the example shown in Fig. 9, the movable oil groove (75) includes a first movable oil groove (76) and a second movable oil groove (77).

[0094] The first movable oil groove (76) extends in the circumferential direction along the outer peripheral surface of the movable wrap (72). The first movable oil groove (76) is disposed near one end of the fixed oil groove (80).

[0095] The second movable-side oil groove (77) is positioned away from the first movable-side oil groove (76) and extends circumferentially along the outer peripheral surface of the movable-side wrap (72). The second movable-side oil groove (77) is positioned near the suction port (64).

[0096] In the compression mechanism (40), the position of the movable oil groove (75) switches among a first state, a second state, a third state, and a fourth state during the orbital movement of the movable scroll (70).

[0097] <First state> When the movable scroll (70) is in the eccentric angle position shown in Fig. 9, for example, the first state is reached. In the first state, the first movable oil groove (76) is separated from the compression chamber (S) and communicates with the wide portion (82) of the fixed oil groove (80). Also, in the first state, the first movable oil groove (76) communicates with the first oil reservoir groove (86).

[0098] As a result, in the first state, high-pressure oil flowing through the fixed-side oil groove (80) passes through the first movable-side oil groove (76) and flows into the first oil storage groove (86) (see the white arrows in FIG. 9). As a result, the first movable-side oil groove (76) and the first oil storage groove (86) are filled with high-pressure oil. In the first state, the first movable-side oil groove (76) is isolated from the compression chamber (S).

[0099] <Second state> When the movable scroll (70) in the eccentric angle position of Fig. 9 further orbits and reaches, for example, the eccentric angle position of Fig. 10, the second state is reached. In the second state, the first movable oil groove (76) communicates with the compression chamber (S) and is separated from the fixed oil groove (80). In addition, in the second state, the first movable oil groove (76) communicates with the first oil reservoir groove (86). In this embodiment, the period in the first state is longer than the period in the second state.

[0100] In this way, in the second state, the first movable-side oil groove (76) communicates with both the first compression chamber (S1) and the first oil storage groove (86). As a result, in the second state, in addition to the oil stored in the first movable-side oil groove (76), the oil stored in the first oil storage groove (86) is supplied to the first compression chamber (S1) via the first movable-side oil groove (76) (see the white arrows in FIG. 10).

[0101] <Third state> When the movable scroll (70) is in the eccentric angle position shown in Fig. 11, for example, the movable scroll (70) is in the third state. In the third state, the second movable oil groove (77) is separated from the compression chamber (S) and communicates with the branch groove portion (83) of the fixed oil groove (80). Also, in the third state, the second movable oil groove (77) is in communication with the second oil reservoir groove (87).

[0102] As a result, in the third state, the high-pressure oil flowing through the fixed-side oil groove (80) passes through the second movable-side oil groove (77) and flows into the second oil storage groove (87) (see the white arrows in FIG. 11). As a result, the second movable-side oil groove (77) and the second oil storage groove (87) are filled with high-pressure oil. In the first state, the second movable-side oil groove (77) is isolated from the compression chamber (S).

[0103] <Fourth State> When the movable scroll (70) in the eccentric angle position shown in Fig. 11 further orbits and reaches, for example, the eccentric angle position shown in Fig. 12, a fourth state is reached. In the fourth state, the second movable oil groove (77) communicates with the compression chamber (S) via the communication groove (84) and the suction port (64) and is separated from the fixed oil groove (80). Also, in the fourth state, the second movable oil groove (77) communicates with the second oil reservoir groove (87).

[0104] In this way, in the fourth state, the second movable-side oil groove (77) communicates with both the compression chamber (S) and the second oil storage groove (87). As a result, in the fourth state, in addition to the oil stored in the second movable-side oil groove (77), the oil stored in the second oil storage groove (87) is supplied to the compression chamber (S) through the second movable-side oil groove (77), the communication groove (84), and the suction port (64) (see the white arrows in FIG. 12 ).

[0105] 12, the movable scroll (70) switches to the fourth state at an orbital angle at which refrigerant flows from the suction port (64) into the second compression chamber (S2). This allows oil to be supplied from the first movable oil groove (76) to the first compression chamber (S1) in the second state, and oil to be supplied from the second movable oil groove (77) to the second compression chamber (S2) in the fourth state.

[0106] In this embodiment, the orbiting angle of the movable scroll (70) in the second state (see FIG. 10) is different from the orbiting angle of the movable scroll (70) in the fourth state (see FIG. 12).

[0107] -Effects of the third embodiment- According to this embodiment, in addition to the oil supplied from the first movable-side oil groove (76) to the first compression chamber (S1), oil is also supplied from the second movable-side oil groove (77) to the compression chamber (S) via the suction port (64), thereby making it possible to adjust the amount of oil supplied to the compression chamber (S).

[0108] According to this embodiment, the orbiting angle of the movable scroll (70) in the second state is made different from the orbiting angle of the movable scroll (70) in the fourth state, so that oil can be supplied from the first movable side oil groove (76) to the first compression chamber (S1) and from the second movable side oil groove (77) to the compression chamber (S) via the suction port (64) at appropriate timing.

[0109] Other Embodiments Although the embodiments and modifications have been described above, it will be understood that various modifications in form and detail are possible without departing from the spirit and scope of the claims. Furthermore, elements of the above embodiments, modifications, and other embodiments may be combined or substituted as appropriate. Furthermore, the terms "first," "second," "third," etc. in the specification and claims are used to distinguish between terms to which these terms are attached, and do not limit the number or order of those terms. [Industrial Applicability]

[0110] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for scroll compressors and refrigeration systems. [Explanation of symbols]

[0111] 1 Refrigeration equipment 10 Scroll compressor 60 Fixed Scroll 62 Fixed side wrap 64 Intake port 70 movable scroll 72 Movable side wrap 75 Movable side oil groove 76 1st movable side oil groove 77 2nd movable side oil groove 80 Fixed side oil groove 85 Oil storage groove 86 First Oil Reservoir Ditch 87 Second oil storage trench S compression chamber S1 First compression chamber S2 Second compression chamber

Claims

1. a fixed scroll (60) having a fixed side wrap (62); a movable scroll (70) having a movable wrap (72) that meshes with the fixed wrap (62) to form a compression chamber (S), a fixed-side oil groove (80) to which oil is supplied, and an oil storage groove (85) arranged away from the fixed-side oil groove (80), provided on a surface of the fixed scroll (60) facing the movable scroll (70); a movable-side oil groove (75) is provided on a surface of the movable scroll (70) facing the fixed scroll (60); During the orbital movement of the movable scroll (70), the position of the movable oil groove (75) a first state in which the movable oil groove (75) is separated from the compression chamber (S) and communicates with the fixed oil groove (80); a second state in which the movable-side oil groove (75) communicates with the compression chamber (S) and is separated from the fixed-side oil groove (80); In the first state and the second state, the movable oil groove (75) communicates with the oil reservoir groove (85). Scroll compressor.

2. The scroll compressor of claim 1, The period in which the first state is maintained is longer than the period in which the second state is maintained. Scroll compressor.

3. The scroll compressor according to claim 1 or 2, The compression chamber (S) has a first compression chamber (S1) surrounded by the outer peripheral surface of the movable side wrap (72) and the inner peripheral surface of the fixed side wrap (62), and a second compression chamber (S2) surrounded by the inner peripheral surface of the movable side wrap (72) and the outer peripheral surface of the fixed side wrap (62), In the second state, the movable oil groove (75) communicates with the first compression chamber (S1). Scroll compressor.

4. The scroll compressor according to claim 1 or 2, the fixed scroll (60) has a suction port (64) that opens at the winding end side of the fixed side wrap (62) and communicates with the compression chamber (S); In the second state, the movable oil groove (75) communicates with the compression chamber (S) through the suction port (64). Scroll compressor.

5. The scroll compressor of claim 4, The compression chamber (S) has a first compression chamber (S1) surrounded by the outer peripheral surface of the movable side wrap (72) and the inner peripheral surface of the fixed side wrap (62), and a second compression chamber (S2) surrounded by the inner peripheral surface of the movable side wrap (72) and the outer peripheral surface of the fixed side wrap (62), The movable scroll (70) switches to the second state at an orbital angle at which refrigerant flows from the suction port (64) into at least one of the first compression chamber (S1) and the second compression chamber (S2). Scroll compressor.

6. The scroll compressor of claim 5, The movable scroll (70) switches to the second state at an orbital angle at which refrigerant flows from the suction port (64) into the second compression chamber (S2). Scroll compressor.

7. The scroll compressor according to claim 1 or 2, the fixed scroll (60) has a suction port (64) that opens at the winding end side of the fixed side wrap (62) and communicates with the compression chamber (S); The compression chamber (S) has a first compression chamber (S1) surrounded by the outer peripheral surface of the movable side wrap (72) and the inner peripheral surface of the fixed side wrap (62), and a second compression chamber (S2) surrounded by the inner peripheral surface of the movable side wrap (72) and the outer peripheral surface of the fixed side wrap (62), the movable-side oil groove (75) includes a first movable-side oil groove (76) and a second movable-side oil groove (77) arranged apart from the first movable-side oil groove (76), the oil retention groove (85) includes a first oil retention groove (86) communicating with the first movable-side oil groove (76) and a second oil retention groove (87) communicating with the second movable-side oil groove (77); During the orbital movement of the movable scroll (70), the position of the movable oil groove (75) the first state in which the first movable oil groove (76) is separated from the first compression chamber (S1) and communicates with the fixed oil groove (80); the second state in which the first movable-side oil groove (76) communicates with the first compression chamber (S1) and is separated from the fixed-side oil groove (80); a third state in which the second movable-side oil groove (77) is separated from the suction port (64) and communicates with the fixed-side oil groove (80); a fourth state in which the second movable-side oil groove (77) communicates with the compression chamber (S) through the suction port (64) and is separated from the fixed-side oil groove (80), In the first state and the second state, the first movable-side oil groove (76) communicates with the first oil reservoir groove (86), In the third state and the fourth state, the second movable-side oil groove (77) communicates with the second oil reservoir groove (87). Scroll compressor.

8. The scroll compressor of claim 7, The orbiting angle of the movable scroll (70) in the second state is different from the orbiting angle of the movable scroll (70) in the fourth state. Scroll compressor.

9. The scroll compressor (10) according to claim 1 or 2 is provided. Refrigeration equipment.

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