Scroll compressor and refrigerating apparatus

Abstract

During the orbiting operation of a movable scroll (70), the position of a movable-side oil groove (75) switches between a first state and a second state. In the first state, the movable-side oil groove (75) separates from a compression chamber (S) and communicates with a fixed-side oil groove (80). In the second state, the movable-side oil groove (75) communicates with the compression chamber (S) and separates from the fixed-side oil groove (80). In the first state and the second state, the movable-side oil groove (75) communicates with an oil storage groove (85).

Description

Scroll Compressor and Refrigeration Device

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

[0002] In Patent Document 1, during the swirling operation of the movable scroll, after supplying oil from the fixed-side oil groove of the fixed scroll to the movable-side oil groove of the movable scroll, the movable-side oil groove is communicated with the compression chamber, so that oil is supplied from the movable-side oil groove toward the compression chamber. A scroll compressor is disclosed.

[0003] Japanese Patent No. 5954453

[0004] By the way, in order to sufficiently secure the amount of oil supplied to the compression chamber, it is conceivable to increase the volume of the movable-side oil groove. However, due to the dimensional constraints of the movable scroll, it is difficult to increase the length and width of the movable-side oil groove.

[0005] An object of the present disclosure is to be able to sufficiently secure the amount of oil supplied to the compression chamber without changing the volume of the movable-side oil groove.

[0006] A first aspect of the present disclosure includes a fixed scroll (60) having a fixed-side wrap (62), and a movable scroll (70) having a movable-side wrap (72) that meshes with the fixed-side wrap (62) to form a compression chamber (S). On the opposing surface of the fixed scroll (60) with respect to the movable scroll (70), 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) are provided. On the opposing surface of the movable scroll (70) with respect to the fixed scroll (60), a movable-side oil groove (75) is provided. During the swirling operation 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). In the first state and the second state, the movable-side oil groove (75) communicates with the oil storage groove (85). It is a scroll compressor.

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

[0008] Furthermore, the amount of oil supplied to the compression chamber (S) can be adjusted by changing the depth of the oil storage groove (85) to control the amount of oil stored.

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

[0010] In the second embodiment, by making the period of the first state longer than the period of the second state, oil can be properly 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 according to the first or second aspect, wherein the compression chamber (S) includes a first compression chamber (S1) formed by being surrounded by the outer circumferential surface of the movable side wrap (72) and the inner circumferential surface of the fixed side wrap (62), and a second compression chamber (S2) formed by being surrounded by the inner circumferential surface of the movable side wrap (72) and the outer circumferential surface of the fixed side wrap (62), and in the second state, the movable side oil groove (75) communicates with the first compression chamber (S1).

[0012] In the third embodiment, 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 on the winding end side of the fixed wrap (62) and communicates with the compression chamber (S), and in the second state, the movable oil groove (75) communicates with the compression chamber (S) via the intake port (64).

[0014] In the fourth embodiment, oil can be supplied from the movable oil groove (75) to the compression chamber (S) via 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) includes a first compression chamber (S1) formed by being surrounded by the outer circumferential surface of the movable side wrap (72) and the inner circumferential surface of the fixed side wrap (62), and a second compression chamber (S2) formed by being surrounded by the inner circumferential surface of the movable side wrap (72) and the outer circumferential surface of the fixed side wrap (62), and the movable scroll (70) switches to the second state at a rotation angle such that refrigerant flows from the intake port (64) into at least one of the first compression chamber (S1) and the second compression chamber (S2).

[0016] In the fifth 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).

[0017] A sixth aspect of the present disclosure is a scroll compressor of the fifth aspect, wherein the movable scroll (70) switches to the second state at a rotation angle such that refrigerant flows from the intake port (64) into the second compression chamber (S2).

[0018] In the sixth embodiment, 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 a scroll compressor of the first or second aspect, wherein the fixed scroll (60) has an intake port (64) that opens on the winding end side of the fixed wrap (62) and communicates with the compression chamber (S), and the compression chamber (S) has a first compression chamber (S1) formed by being surrounded by the outer circumferential surface of the movable wrap (72) and the inner circumferential surface of the fixed wrap (62), and the inner circumferential surface of the movable wrap (72) and The movable side oil groove (75) includes a first movable side oil groove (76) and a second movable side oil groove (77) located away from the first movable side oil groove (76), and the oil reservoir groove (85) includes a first oil reservoir groove (86) communicating with the first movable side oil groove (76) and a second oil reservoir groove (87) communicating with the second movable side oil groove (77), and During the rotational movement of the movable scroll (70), the position of the movable oil groove (75) is such that the first movable oil groove (76) is away from the first compression chamber (S1) and in communication with the fixed oil groove (80), the first movable oil groove (76) is in communication with the first compression chamber (S1) and away from the fixed oil groove (80), and the second movable oil groove (77) is away from the intake port (64) and away from the fixed oil groove (8 The system switches between a third state in which it communicates with (0) and a fourth state in which the second movable oil groove (77) communicates with the compression chamber (S) via the suction port (64) and is separated from the fixed oil groove (80). In the first and second states, the first movable oil groove (76) communicates with the first oil reservoir (86), and in the third and fourth states, the second movable oil groove (77) communicates with the second oil reservoir (87).

[0020] In the seventh embodiment, in addition to the oil supplied to the first compression chamber (S1) from the first movable oil groove (76), the amount of oil supplied to the compression chamber (S) can be adjusted by supplying oil to the compression chamber (S) from the second movable oil groove (77) via the suction port (64).

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

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

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

[0024] In the ninth aspect, a refrigeration system equipped with a scroll compressor (10) can be provided.

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

[0026] <Embodiment 1> As shown in Figure 1, the scroll compressor (10) is installed in the refrigeration device (1). The refrigeration device (1) has a refrigerant circuit (1a) filled with refrigerant. The refrigerant circuit (1a) has a scroll compressor (10), a heat sink (3), a pressure reducing mechanism (4), and an evaporator (5). The pressure reducing mechanism (4) is, for example, an expansion valve. The refrigerant circuit (1a) performs a vapor compression type refrigeration cycle.

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

[0028] As shown in Figure 2, the scroll compressor (10) comprises 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 type. The motor (30) and the compression mechanism (40) are housed in the casing (20).

[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 positioned 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 positioned above the motor (30). A compression mechanism (40) is positioned above the housing (50). The inlet end of the discharge pipe (13) is located between the motor (30) and the housing (50).

[0032] A recess (53) is formed in the housing (50). The recess (53) is formed by a recess in a part 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). The drive shaft (11) 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). The lower part of the main shaft portion (14) is rotatably supported by a lower bearing (22). The lower bearing (22) is fixed to the inner circumferential surface of the casing (20). For example, a positive displacement pump (25) is provided on the lower bearing (22). The upper part 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) comprises 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 positioned between the fixed scroll (60) and the housing (50).

[0036] The fixed scroll (60) comprises a fixed end plate (61), a fixed lap (62), and an outer peripheral wall (63). The outer peripheral wall (63) is formed in a substantially cylindrical shape. The outer peripheral wall (63) is erected on the outer edge of the front surface (bottom surface in Figure 2) of the fixed end plate (61).

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

[0038] The fixed end plate (61) is located on the outer circumference and is formed continuously with the fixed lap (62). The tip surface of the fixed lap (62) and the tip surface of the outer circumference wall (63) are formed substantially flush. 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) engages with the fixed lap (62).

[0040] The boss portion (73) is formed at the center of the lower surface of the movable-side mirror 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 thereto. An annular depression is provided radially outside the recess (53) in the upper portion of the housing (50). The annular depression in the upper portion of the housing (50), the fixed scroll (60), and the movable scroll (70) define a back pressure chamber (43).

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

[0042] The compression mechanism (40) has a compression chamber (S) into which refrigerant flows. The compression chamber (S) is formed between the fixed scroll (60) and the movable scroll (70). The movable scroll (70) is arranged such that the movable-side wrap (72) meshes with the fixed-side wrap (62) of the fixed scroll (60). Here, the lower surface of the outer peripheral wall (63) of the fixed scroll (60) serves as the opposing surface to the movable scroll (70). Also, the upper surface of the movable-side mirror plate (71) of the movable scroll (70) serves as the opposing surface to 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 end of the winding 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 partitioned into a first compression chamber (S1) radially outside the movable scroll (70) and a second compression chamber (S2) radially inside 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) substantially contact each other, the first compression chamber (S1) and the second compression chamber (S2) are partitioned with the contact portion therebetween (for example, refer to FIG. 5).

[0045] The first compression chamber (S1) is 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). The second compression chamber (S2) is 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).

[0046] A discharge port (65) is formed at the center of the fixed-side end plate (61) of the fixed scroll (60). The discharge port (65) opens on the upper surface of the fixed-side end plate (61) of the fixed scroll (60). The high-pressure gas refrigerant discharged from the discharge port (65) flows out 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 in the vertical direction 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 the oil reservoir portion (21). The pump (25) sucks up oil from the oil reservoir portion (21) as the drive shaft (11) rotates and conveys it to the oil supply passage (16). The oil supply passage (16) supplies the oil in the oil reservoir portion (21) to the sliding surfaces between the lower bearing (22) and the drive shaft (11), and between the upper bearing (51) and the drive shaft (11), and also supplies it to the sliding surface between the boss portion (73) and the drive shaft (11). The oil supply passage (16) opens on the upper end surface of the drive shaft (11) and supplies oil above 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). High-pressure oil is supplied to the recess (53), and a high pressure corresponding to the discharge pressure of the compression mechanism (40) acts thereon. The movable scroll (70) is pressed against the fixed scroll (60) by the high pressure in the recess (53) and the intermediate pressure in the back pressure chamber (43).

[0049] An oil passage (55) is formed inside the housing (50) and the fixed scroll (60). The inlet end of the oil passage (55) communicates with a recess (53) in the housing (50). The 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 from the recess (53) to the opposing surfaces of 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 on the lower surface of the outer peripheral wall (63) of the fixed scroll (60) (see Figure 5). The primary passage (48) communicates with the compression chamber (S) in an intermediate pressure state.

[0051] A secondary passage (49) is formed on the outer circumference of the movable end plate (71) of the movable scroll (70) (see Figure 5). The secondary passage (49) is composed of a through hole that penetrates 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 communicates with the back pressure chamber (43) between the movable scroll (70) and the housing (50). In other words, refrigerant at an intermediate pressure is intermittently supplied from the compression chamber (S) at an intermediate pressure to the back pressure chamber (43), causing the back pressure chamber (43) to reach 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 reservoir groove (85) are formed on the outer peripheral wall (63) of the fixed scroll (60) on the surface (lower surface in Figure 2) facing the movable side end plate (71) of the movable scroll (70).

[0053] The stationary oil groove (80) has a circumferential groove (81) and a wide section (82). The circumferential groove (81) extends circumferentially along the inner surface of the outer peripheral wall (63) of the stationary scroll (60). The circumferential groove (81) communicates with the oil passage (55). Oil is supplied to the circumferential groove (81) from the oil passage (55).

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

[0055] The oil reservoir (85) is positioned away from the fixed-side oil reservoir (80). In the example shown in Figure 3, the oil reservoir (85) is the first oil reservoir (86). The first oil reservoir (86) is positioned circumferentially away from one end of the fixed-side oil reservoir (80).

[0056] As shown in Figure 4, 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 Figure 4, the movable side oil groove (75) is the first movable side oil groove (76). The first movable side oil groove (76) extends circumferentially along the outer surface of the movable side wrap (72).

[0057] -Operation- The basic operation of the scroll compressor (10) will be explained below. In Figure 2, when the motor (30) is activated, the drive shaft (11) to which the rotor (32) is fixed rotates. The movable scroll (70) rotates around the axis of the drive shaft (11).

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

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

[0060] The oil supplied to the boss portion (73) flows out into the recess (53) of the housing (50) through the gap between the eccentric portion (15) of the drive shaft (11) and the boss portion (73). As a result, the recess (53) of the housing (50) becomes high pressure, equivalent to the discharge pressure of the compression mechanism (40). The high pressure in the recess (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 out into the fixed-side oil groove (80). As a result, high-pressure oil equivalent to the discharge pressure of the compression mechanism (40) is supplied to the fixed-side oil groove (80).

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

[0063] <First State> The first state is reached when the movable scroll (70) is in the eccentric angle position shown in Figure 5, for example. 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).

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

[0065] <Second State> The movable scroll (70), which is at the eccentric angle position in Figure 5, rotates further until it reaches the eccentric angle position in Figure 6, for example, in the second state. In the second state, the first movable oil groove (76) communicates with the compression chamber (S) and separates from the fixed oil groove (80). Also 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] Thus, 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-filled arrow line in Figure 6).

[0067] -Effects of Embodiment 1- According to this embodiment, in the first state, oil is supplied from the fixed oil groove (80) to the oil storage groove (85), and in the second state, in addition to the oil in the movable oil groove (75), the oil from the oil storage groove (85) is supplied to the compression chamber (S), thereby ensuring a sufficient amount of oil supplied to the compression chamber (S) without changing the volume of the movable oil groove (75).

[0068] Furthermore, the amount of oil supplied to the compression chamber (S) can be adjusted by changing the depth of the oil storage groove (85) to control the amount of oil stored.

[0069] According to this embodiment, by making the period of the first state longer than the period of the second state, oil can be properly supplied from the fixed-side oil groove (80) to the oil storage 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 this embodiment, a refrigeration system equipped with a scroll compressor (10) can be provided.

[0072] <Embodiment 2> Hereinafter, the same reference numerals will be used for parts that are the same as in Embodiment 1, and only the differences will be described.

[0073] As shown in Figure 7, a fixed side 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 stationary oil groove (80) has a circumferential groove (81) and a branch groove (83). The circumferential groove (81) extends circumferentially along the inner surface of the outer peripheral wall (63) of the stationary scroll (60). One end of the circumferential groove (81) (the end in the clockwise direction in Figure 7) extends to the vicinity of the winding end position of the stationary wrap (62). The other end of the circumferential groove (81) (the end in the counterclockwise direction in Figure 7) extends to the vicinity of the primary passage (48). The branch groove (83) branches off from the circumferential groove (81) on its way to the end of the circumferential groove (81).

[0075] The oil reservoir groove (85) is positioned away from the fixed-side oil groove (80). In the example shown in Figure 7, the oil reservoir groove (85) is the second oil reservoir groove (87). The second oil reservoir groove (87) is positioned circumferentially away from the end of the branched groove section (83).

[0076] The communication groove (84) communicates with the intake port (64). The communication groove (84) extends from the intake 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 Figure 7, the movable side oil groove (75) is a second movable side oil groove (77). The second movable side oil groove (77) extends circumferentially along the outer surface of the movable side wrap (72). The second movable side oil groove (77) is located near the intake port (64).

[0078] In the compression mechanism (40), the position of the second movable side oil groove (77) switches between a first state and a second state during the rotational movement of the movable scroll (70).

[0079] <First State> The first state is reached when the movable scroll (70) is in the eccentric angle position shown in Figure 7, for example. In the first state, the second movable oil groove (77) is separated from the compression chamber (S) and communicates with the branch groove (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, the high-pressure oil flowing through the fixed-side oil groove (80) flows through the second movable-side oil groove (77) into the second oil reservoir groove (87) (see the white-filled arrow in Figure 7). Consequently, the second movable-side oil groove (77) and the second oil reservoir groove (87) are filled with high-pressure oil. In the first state, the second movable-side oil groove (77) and the compression chamber (S) are isolated.

[0081] <Second State> The movable scroll (70), which is at the eccentric angle position in Figure 7, rotates further until it reaches the eccentric angle position in Figure 8, for example, in the second state. In the second state, the second movable oil groove (77) communicates with the compression chamber (S) via the communication groove (84) and the intake port (64), and moves away 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] Thus, 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) via the second movable side oil groove (77), the communication groove (84), and the suction port (64) (see the white-filled arrows in Figure 8).

[0083] In the second state, the movable scroll (70) switches to the second state at a swirling angle that allows refrigerant to flow from the intake port (64) into at least one of the first compression chamber (S1) and the second compression chamber (S2). In the example shown in Figure 8, the movable scroll (70) switches to the second state at a swirling angle that allows refrigerant to flow from the intake port (64) into the second compression chamber (S2).

[0084] The movable scroll (70) may be configured to switch to the second state at a rotation angle that allows refrigerant to flow from the intake port (64) into the first compression chamber (S1). Alternatively, the movable scroll (70) may be configured to switch to the second state at a rotation angle that allows refrigerant to flow from the intake port (64) into both the first compression chamber (S1) and the second compression chamber (S2).

[0085] -Effects of Embodiment 2- According to this embodiment, oil can be supplied from the movable oil groove (75) to the compression chamber (S) via 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 be made to flow into the second compression chamber (S2).

[0088] <Embodiment 3> As shown in Figure 9, a fixed side 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).

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

[0090] The wide section (82) is provided at one end of the circumferential groove section (81) (the end in the clockwise direction in Figure 9). The other end of the circumferential groove section (81) (the end in the counterclockwise direction in Figure 9) extends to the vicinity of the primary side passage (48). The branched groove section (83) branches off from the circumferential groove section (81) on its way to the other end of the circumferential groove section (81).

[0091] The oil storage groove (85) is positioned away from the fixed-side oil groove (80). In the example shown in Figure 9, the oil storage groove (85) includes a first oil storage groove (86) and a second oil storage groove (87). The first oil storage groove (86) is positioned circumferentially away from one end of the fixed-side oil groove (80). The second oil storage groove (87) is positioned circumferentially away from the end of the branch groove section (83).

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

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

[0094] The first movable side oil groove (76) extends circumferentially along the outer surface of the movable side lap (72). The first movable side oil groove (76) is located near one end of the fixed side oil groove (80).

[0095] The second movable side oil groove (77) is located away from the first movable side oil groove (76). It extends circumferentially along the outer surface of the movable side wrap (72). The second movable side oil groove (77) is located near the intake port (64).

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

[0097] <First State> The first state is reached when the movable scroll (70) is in the eccentric angle position shown in Figure 9, for example. 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, the high-pressure oil flowing through the fixed-side oil groove (80) flows through the first movable-side oil groove (76) into the first oil reservoir groove (86) (see the white-filled arrow in Figure 9). Consequently, the first movable-side oil groove (76) and the first oil reservoir groove (86) are filled with high-pressure oil. In the first state, the first movable-side oil groove (76) and the compression chamber (S) are isolated.

[0099] <Second State> The movable scroll (70), which is at the eccentric angle position in Figure 9, rotates further until it reaches the eccentric angle position in Figure 10, for example, in the second state. In the second state, the first movable oil groove (76) communicates with the compression chamber (S) and moves away from the fixed oil groove (80). Also 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] Thus, 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-filled arrow line in Figure 10).

[0101] <Third State> The third state is reached when the movable scroll (70) is in the eccentric angle position shown in Figure 11, for example. In the third state, the second movable oil groove (77) is separated from the compression chamber (S) and communicates with the branch groove (83) of the fixed oil groove (80). Also in the third state, the second movable oil groove (77) communicates 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) flows through the second movable-side oil groove (77) into the second oil reservoir groove (87) (see the white-filled arrow in Figure 11). Consequently, the second movable-side oil groove (77) and the second oil reservoir groove (87) are filled with high-pressure oil. In the first state, the second movable-side oil groove (77) and the compression chamber (S) are separated.

[0103] <Fourth State> The movable scroll (70), which is at the eccentric angle position in Figure 11, rotates further until it reaches the eccentric angle position in Figure 12, for example, in the fourth state. In the fourth state, the second movable oil groove (77) communicates with the compression chamber (S) via the communication groove (84) and the intake port (64), and moves away 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] Thus, 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) via the second movable side oil groove (77), the communication groove (84), and the suction port (64) (see the white-filled arrows in Figure 12).

[0105] In the example shown in Figure 12, the movable scroll (70) switches to the fourth state at a rotation angle that allows refrigerant to flow from the intake 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, while oil can be supplied from the second movable oil groove (77) to the second compression chamber (S2) in the fourth state.

[0106] In this embodiment, the rotation angle of the movable scroll (70) in the second state (see Figure 10) and the rotation angle of the movable scroll (70) in the fourth state (see Figure 12) are made different.

[0107] -Effects of Embodiment 3- According to this embodiment, in addition to the oil supplied to the first compression chamber (S1) from the first movable oil groove (76), the amount of oil supplied to the compression chamber (S) can be adjusted by supplying oil to the compression chamber (S) from the second movable oil groove (77) via the suction port (64).

[0108] According to this embodiment, by making the rotation angle of the movable scroll (70) in the second state and the rotation angle of the movable scroll (70) in the fourth state different, the supply of oil from the first movable oil groove (76) to the first compression chamber (S1) and the supply of oil from the second movable oil groove (77) to the compression chamber (S) via the suction port (64) can be performed at appropriate timings.

[0109] 《Other Embodiments》 Although embodiments and modifications have been described above, it will be understood that various changes in form and details 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. In addition, the descriptions "first," "second," "third," etc. in the specification and claims are used to distinguish the phrases to which these descriptions are attached, and do not limit the number or order of such phrases.

[0110] As described above, this disclosure is useful for scroll compressors and refrigeration systems.

[0111] 1 Refrigeration unit 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 First movable side oil groove 77 Second movable side oil groove 80 Fixed side oil groove 85 Oil reservoir groove 86 First oil reservoir groove 87 Second oil reservoir groove S Compression chamber S1 First compression chamber S2 Second compression chamber

Claims

1. A fixed scroll (60) having a fixed side wrap (62), and a movable scroll (70) having a movable side wrap (72) that meshes with the fixed side wrap (62) to form a compression chamber (S), wherein the fixed scroll (60) has a fixed side oil groove (80) to which oil is supplied and an oil reservoir groove (85) located away from the fixed side oil groove (80) on the surface of the fixed scroll (60) facing the movable scroll (70), and the movable side oil groove (75) has a movable side oil groove (75) on the surface of the movable scroll (70) facing the fixed scroll (60), and during the rotational movement of the movable scroll (70), the position of the movable side oil groove (75) is such that the movable side oil groove (75) is away from the compression chamber (S) and in communication with the fixed side oil groove (80), A scroll compressor that switches to a second state in which the movable oil groove (75) communicates with the compression chamber (S) and is separated from the fixed oil groove (80), and in the first and second states, the movable oil groove (75) communicates with the oil reservoir groove (85).

2. A scroll compressor according to claim 1, wherein the period in the first state is longer than the period in the second state.

3. A scroll compressor according to claim 1 or 2, wherein the compression chamber (S) comprises a first compression chamber (S1) formed by being surrounded by the outer circumferential surface of the movable side wrap (72) and the inner circumferential surface of the fixed side wrap (62), and a second compression chamber (S2) formed by being surrounded by the inner circumferential surface of the movable side wrap (72) and the outer circumferential surface of the fixed side wrap (62), and in the second state, the movable side oil groove (75) communicates with the first compression chamber (S1).

4. A scroll compressor according to claim 1 or 2, wherein the fixed scroll (60) has an intake port (64) that opens on the winding end side 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).

5. The scroll compressor according to claim 4, wherein the compression chamber (S) comprises a first compression chamber (S1) formed by being surrounded by the outer circumferential surface of the movable side wrap (72) and the inner circumferential surface of the fixed side wrap (62), and a second compression chamber (S2) formed by being surrounded by the inner circumferential surface of the movable side wrap (72) and the outer circumferential surface of the fixed side wrap (62), and the movable scroll (70) switches to the second state at a rotation angle such that refrigerant flows from the intake port (64) into at least one of the first compression chamber (S1) and the second compression chamber (S2).

6. The scroll compressor according to claim 5, wherein the movable scroll (70) switches to the second state at a rotation angle such that refrigerant flows from the intake port (64) into the second compression chamber (S2).

7. In the scroll compressor of claim 1 or 2, the fixed scroll (60) has an intake port (64) that opens on 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) formed by being surrounded by the outer circumferential surface of the movable side wrap (72) and the inner circumferential surface of the fixed side wrap (62), and a second compression chamber (S2) formed by being surrounded by the inner circumferential surface of the movable side wrap (72) and the outer circumferential 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 reservoir (85) includes a first oil reservoir (86) communicating with the first movable side oil reservoir (76) and a second oil reservoir (87) communicating with the second movable side oil reservoir (77), and during the rotational movement of the movable scroll (70), the position of the movable side oil reservoir (75) is such that: the first movable side oil reservoir (76) is away from the first compression chamber (S1) and in communication with the fixed side oil reservoir (80); the first movable side oil reservoir (76) is in communication with the first compression chamber (S1) and away from the fixed side oil reservoir (80); and the second movable side oil reservoir (77) is away from the suction port (64) and in communication with the fixed side oil reservoir (80). A scroll compressor that switches to a fourth state in which the second movable oil groove (77) communicates with the compression chamber (S) via the suction port (64) and is separated from the fixed oil groove (80), wherein in the first and second states, the first movable oil groove (76) communicates with the first oil reservoir groove (86), and in the third and fourth states, the second movable oil groove (77) communicates with the second oil reservoir groove (87).

8. A scroll compressor according to claim 7, wherein the rotation angle of the movable scroll (70) in the second state and the rotation angle of the movable scroll (70) in the fourth state are different.

9. A refrigeration apparatus comprising any one scroll compressor (10) according to claims 1 to 8.

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