Scroll Compressor

Abstract

To supply an oil to spaces at the radial inner side and the radial outer side relative to a movable scroll in a compressor chamber.SOLUTION: A scroll compressor has: an outer oil supply mechanism (80) which supplies an oil to an outer chamber (S1) of a compressor (S); and an inner oil supply mechanism (85) which supplies the oil to an inner chamber (S2). The inner oil supply mechanism (85) has an oil supply groove (86) and a communication port (87). The communication port (87) and the oil supply groove (86) communicate with each other in a predetermined period when a center position (C2) as seen in a thickness direction at a suction side end part of a movable side lap (72) is located at the radial outer side relative to a center position (C1) of a space between laps of the fixed scroll (60).SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to scroll compressors. [Background technology]

[0002] Patent Document 1 discloses a scroll compressor that is configured so that, during rotational driving of the movable scroll, switching occurs between a state in which only the fixed-side oil groove and the movable-side oil groove are in communication with each other, and a state in which the movable-side oil groove is in communication with both the fixed-side oil groove and the compression chamber at the same time. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-77616 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the invention of Patent Document 1, the movable oil groove is connected to the space in the compression chamber radially outward of the movable scroll, making it difficult for oil to be supplied to the space in the compression chamber radially inward of the movable scroll.

[0005] An object of the present disclosure is to make it possible to supply oil to spaces radially inward and outward from the movable scroll in a compression chamber. [Means for solving the problem]

[0006] A first aspect of the present disclosure is directed to a scroll compressor including a fixed scroll (60) and a movable scroll (70) that forms a compression chamber (S) between the fixed scroll (60) and the fixed scroll (60). The scroll compressor includes a back pressure chamber (54) that applies an intermediate pressure between the suction pressure and the discharge pressure of the compression chamber (S) to a surface of the movable scroll (70) opposite to a sliding surface thereof, an outer oil supply mechanism (80) that supplies oil to an outer chamber (S1) in the compression chamber (S) that is radially outer than a wrap (72) of the movable scroll (70), and an inner oil supply mechanism (85) that supplies oil to an inner chamber (S2) in the compression chamber (S) that is radially inner than the wrap (72) of the movable scroll (70). The inner oil supply mechanism (85) supplies oil to the fixed scroll (60). The movable scroll (70) has an oil supply section (86) provided on a sliding surface of the movable scroll (70) and communicating with a suction region of the compression chamber (S), and a communication port (87) penetrating the sliding surface of the movable scroll (70) and communicating with the back pressure chamber (54), wherein the communication port (87) communicates with the oil supply section (86) during one rotation of the movable scroll (70) within a predetermined period during which a center position (C2) in the thickness direction of a wrap end on the suction side of the movable scroll (70) is located radially outward of a center position (C1) of the wrap interval of the fixed scroll (60).

[0007] In the first aspect, the compressor includes an outer oil supply mechanism (80) that supplies oil to the outer chamber (S1) of the compression chamber (S), and an inner oil supply mechanism (85) that supplies oil to the inner chamber (S2). The inner oil supply mechanism (85) has an oil supply portion (86) and a communication port (87). The communication port (87) and the oil supply groove (86) communicate with each other during a predetermined period during which a center position (C2) in the thickness direction of a wrap end on the suction side of the movable scroll (70) is located radially outward from a center position (C1) of the wrap interval of the fixed scroll (60).

[0008] This makes it possible to supply oil to spaces inward and outward in the radial direction of the compression chamber (S) from the movable scroll (70).

[0009] A second aspect of the present disclosure is the first aspect, further comprising an intermediate pressure section (83) provided on the sliding surface of the fixed scroll (60) and communicating with the compression chamber (S) during compression, and the communication port (87) alternately communicates with the oil supply section (86) and the intermediate pressure section (83) during one rotation of the movable scroll (70).

[0010] In the second mode, during one rotation of the movable scroll (70), the communication port (87) is alternately brought into communication with the oil supply section (86) and the intermediate pressure section (83).

[0011] As a result, intermediate-pressure refrigerant is intermittently supplied from the compression chamber (S) in an intermediate-pressure state to the back pressure chamber (54), so that the back pressure chamber (54) can be kept at a predetermined intermediate pressure.

[0012] A third aspect of the present disclosure is related to the first or second aspect, wherein the communication port (87) is connected to the oil supply section (86) within a predetermined period while the movable scroll (70) rotates within a range of 0° or more and 100° or less when the suction closing angle of the outer chamber (S1) is 0°.

[0013] In the third aspect, the period during which the communication port (87) and the oil supply part (86) communicate with each other is set based on the suction closing angle of the outer chamber (S1), so that oil can be supplied to the inner chamber (S2) of the compression chamber (S) at a predetermined timing. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a vertical cross-sectional view showing the configuration of a scroll compressor according to this embodiment. [Diagram 2] FIG. 2 is a bottom view showing the configuration of the fixed scroll. [Diagram 3] FIG. 3 is a plan view showing the configuration of the movable scroll. [Figure 4] FIG. 4 is an enlarged vertical cross-sectional view showing a main part of the scroll compressor. [Diagram 5]FIG. 5 is a diagram showing the flow of oil when the communication port and the fixed-side oil groove start to communicate with each other. [Figure 6] FIG. 6 is a diagram showing the flow of oil when the communication port and the fixed-side oil groove are in communication with each other. [Figure 7] FIG. 7 is a diagram showing the flow of oil immediately before the communication between the communication port and the fixed-side oil groove is terminated. [Figure 8] FIG. 8 is a diagram showing a state in which the outer oil supply operation and the back pressure adjustment operation are being performed. [Figure 9] FIG. 9 is a diagram for explaining a period during which the communication port and the oil groove are in communication with each other. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] <<Embodiment>> An embodiment will be described.

[0016] As shown in Fig. 1, the scroll compressor (10) is provided in a refrigerant circuit of a vapor compression refrigeration cycle. In the refrigerant circuit, the refrigerant compressed by the scroll compressor (10) is condensed in a condenser, reduced in pressure by a pressure reducing mechanism, evaporated in an evaporator, and sucked into the scroll compressor (10).

[0017] The scroll compressor (10) includes a casing (20), and an electric motor (30) and a compression mechanism (40) housed in the casing (20). The casing (20) is formed in a vertically elongated cylindrical shape and configured as a sealed dome type.

[0018] The electric motor (30) includes a stator (31) fixed to the casing (20) and a rotor (32) disposed inside the stator (31). The rotor (32) is fixed to the drive shaft (11).

[0019] An oil reservoir (21) for storing oil is formed at the bottom of the casing (20). 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).

[0020] A housing (50) is fixed to the casing (20). The housing (50) is disposed above the electric motor (30). The compression mechanism (40) is disposed above the housing (50). The inlet end of the discharge pipe (13) is located between the electric motor (30) and the housing (50).

[0021] The drive shaft (11) extends in the vertical direction along the central axis of the casing (20). The drive shaft (11) has a main shaft portion (14) and an eccentric portion (15) provided at the upper end of the main shaft portion (14).

[0022] 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). An upper portion of the main shaft portion (14) extends through the housing (50) and is rotatably supported by an upper bearing (51) of the housing (50).

[0023] The compression mechanism (40) includes a fixed scroll (60) and a movable scroll (70). The fixed scroll (60) is fixed to an upper surface of the housing (50). The movable scroll (70) is disposed between the fixed scroll (60) and the housing (50).

[0024] The housing (50) is provided with an annular portion (52) and a recessed portion (53). The annular portion (52) is provided on the outer periphery of the housing (50). The recessed portion (53) is provided in the upper center of the housing (50). An upper bearing (51) is provided below the recessed portion (53).

[0025] The housing (50) is fixed inside the casing (20). The inner peripheral surface of the casing (20) and the outer peripheral surface of the annular portion (52) of the housing (50) are in airtight contact with each other around the entire circumference. The housing (50) divides the interior of the casing (20) into an upper space (23) in which the compression mechanism (40) is housed and a lower space (24) in which the electric motor (30) is housed.

[0026] The fixed scroll (60) comprises a fixed side end plate (61), a substantially cylindrical outer peripheral wall (63) extending upright from the outer edge of the lower surface of the fixed side end plate (61), and a spiral-shaped fixed side wrap (62) extending upright inside the outer peripheral wall (63) of the fixed side end plate (61) (see Figure 2).

[0027] The fixed scroll (60) is fixed to the housing (50).

[0028] The movable scroll (70) includes a movable side end plate (71), a spiral-shaped movable side wrap (72) formed on the upper surface of the movable side end plate (71), and a boss portion (73) formed in the center of the lower surface of the movable side end plate (71) (see Figure 3).

[0029] The boss portion (73) is connected to the drive shaft (11) by inserting the eccentric portion (15) of the drive shaft (11) into the boss portion (73). An annular recess is provided radially outward of the recess (53) in the upper portion of the housing (50). A back pressure chamber (54) is defined by the annular recess in the upper portion of the housing (50), the fixed scroll (60), and the movable scroll (70).

[0030] The back pressure chamber (54) is supplied with intermediate-pressure refrigerant from the compression chamber (S) in the middle of compression. The back pressure chamber (54) is maintained at an intermediate pressure between the suction pressure and discharge pressure of the compression chamber (S). The intermediate pressure of the back pressure chamber (54) acts on the back surface of the movable scroll (70). An Oldham coupling (46) is provided in the back pressure chamber (54). The Oldham coupling (46) prevents the movable scroll (70) from rotating on its axis.

[0031] In the compression mechanism (40), a compression chamber (S) into which a refrigerant flows is formed between the fixed scroll (60) and the movable scroll (70). The movable scroll (70) is disposed such that the movable wrap (72) meshes with the fixed wrap (62) of the fixed scroll (60). Here, the lower surface of the outer circumferential wall (63) of the fixed scroll (60) serves as a sliding surface against the movable scroll (70). In addition, the upper surface of the movable end plate (71) of the movable scroll (70) serves as a sliding surface against the fixed scroll (60).

[0032] A suction port (64) communicating with the compression chamber (S) is formed in the outer peripheral wall (63) of the fixed scroll (60). The suction pipe (12) is connected to the upstream side of the suction port (64).

[0033] The compression chamber (S) is divided into an outer chamber (S1) radially outward from the movable scroll (70) and an inner 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 outer chamber (S1) and the inner chamber (S2) are defined across the contact portion (see, for example, FIG. 5).

[0034] A discharge port (65) is formed in the center of the fixed end plate (61) of the fixed scroll (60). The high-pressure refrigerant compressed in the compression mechanism (40) flows into the lower space (24) through a passage (not shown) formed in the fixed end plate (61) of the fixed scroll (60) and the housing (50).

[0035] An oil supply hole (16) is formed inside the drive shaft (11) and extends vertically from the lower end to the upper end of the drive shaft (11). The lower end of the drive shaft (11) is immersed in an oil reservoir (21). The oil supply hole (16) supplies oil from the oil reservoir (21) to the lower bearing (22) and the upper bearing (51), and also supplies oil to the gap between the boss portion (73) and the drive shaft (11). The oil supply hole (16) opens to the upper end surface of the drive shaft (11) and supplies oil to the upper side of the drive shaft (11).

[0036] The recess (53) of the housing (50) communicates with the oil supply hole (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 pressure equivalent to the discharge pressure of the compression mechanism (40) acts on the recess (53). The high-pressure pressure of the recess (53) presses the movable scroll (70) against the fixed scroll (60).

[0037] An oil passage (55) is formed inside the housing (50) and the fixed scroll (60). An inflow end of the oil passage (55) communicates with the recess (53) of the housing (50) (not shown). An outflow end of the oil passage (55) opens to the sliding surface of the fixed scroll (60). The oil passage (55) supplies high-pressure oil in the recess (53) to the sliding surface between the movable end plate (71) of the movable scroll (70) and the outer circumferential wall (63) of the fixed scroll (60).

[0038] <Configuration of outer oil supply mechanism, inner oil supply mechanism, and intermediate pressure groove> As shown in FIG. 2, a fixed side oil groove (81) serving as an outer oil supply mechanism (80), an oil supply groove (86) (oil supply portion) serving as an inner oil supply mechanism (85), and an intermediate pressure groove (83) (intermediate pressure portion) are formed on the sliding surface of the outer peripheral wall (63) of the fixed scroll (60).

[0039] The fixed-side oil groove (81) is formed in a surface of the outer circumferential wall (63) of the fixed scroll (60) that slides against the movable end plate (71) of the movable scroll (70). The fixed-side oil groove (81) extends in a substantially arc shape along the inner circumferential surface of the outer circumferential wall (63) of the fixed scroll (60). The fixed-side oil groove (81) is in communication with the oil passage (55), so that oil is supplied from the oil passage (55) to the fixed-side oil groove (81).

[0040] The oil groove (86) extends in the circumferential direction of the fixed scroll (60). One end of the oil groove (86) communicates with the suction port (64). It is only necessary that the oil groove (86) communicates with a suction region of the compression chamber (S) upstream of the suction-side end of the movable wrap (72).

[0041] The intermediate pressure groove (83) is formed between the fixed side oil groove (81) and the oil supply groove (86). One end of the intermediate pressure groove (83) communicates with the compression chamber (S) in the middle of compression (intermediate pressure state).

[0042] As shown in FIG. 3, a movable oil groove (82) serving as an outer oil supply mechanism (80) and a communication port (87) serving as an inner oil supply mechanism (85) are formed on the sliding surface of the movable end plate (71) of the movable scroll (70).

[0043] The movable oil groove (82) is formed near an end of the fixed oil groove (81) of the fixed scroll (60). The movable oil groove (82) is formed in a substantially arc shape. An end of the movable oil groove (82) closer to the fixed oil groove (81) bends and extends toward the center of the movable scroll (70). The movable oil groove (82) communicates with the fixed oil groove (81) and the outer chamber (S1) of the compression chamber (S) during one rotation of the movable scroll (70).

[0044] The communication port (87) penetrates the outer periphery of the movable side end plate (71) in the thickness direction. The communication port (87) communicates between the sliding surface of the movable scroll (70) and the back pressure chamber (54).

[0045] As indicated by the arrows in FIG. 4, the communication port (87) of the movable scroll (70) communicates with the oil supply groove (86) of the fixed scroll (60), so that oil in the back pressure chamber (54) is supplied to the suction port (64).

[0046] The compression mechanism (40) performs an inner oil-supply operation for supplying oil to the inner chamber (S2), an outer oil-supply operation for supplying oil to the outer chamber (S1), and a back-pressure adjustment operation for supplying intermediate-pressure refrigerant to the back-pressure chamber (54). That is, in the compression mechanism (40), the inner oil-supply operation, the outer oil-supply operation, and the back-pressure adjustment operation are sequentially repeated during one rotation of the movable scroll (70).

[0047] - Driving operation - The basic operation of the scroll compressor (10) will be described. When the electric motor (30) is operated, the movable scroll (70) of the compression mechanism (40) is driven to rotate. The movable scroll (70) is prevented from rotating on its own axis by the Oldham coupling (46), and therefore only rotates eccentrically about the axis of the drive shaft (11).

[0048] As shown in Figs. 5 to 8, when the movable scroll (70) rotates eccentrically, the compression chamber (S) is divided into an outer chamber (S1) and an inner chamber (S2). A plurality of inner chambers (S2) are formed between the fixed wrap (62) of the fixed scroll (60) and the movable wrap (72) of the movable scroll (70). When the movable scroll (70) rotates eccentrically, these inner chambers (S2) gradually approach the center (discharge port (65)), and the volume of these inner chambers (S2) decreases. As a result, the refrigerant is compressed in the inner chambers (S2).

[0049] When the inner chamber (S2), which has become the minimum volume, communicates with the discharge port (65), the high-pressure gas refrigerant in the inner chamber (S2) is discharged from the discharge port (65). The high-pressure refrigerant gas flows through the passages formed in the fixed scroll (60) and the housing (50) and flows into the lower space (24). The high-pressure gas refrigerant in the lower space (24) is discharged to the outside of the casing (20) through the discharge pipe (13).

[0050] - Refueling operation - Next, the oil supplying operation in the scroll compressor (10) will be described in detail with reference to FIGS.

[0051] When the high-pressure gas refrigerant flows into the lower space (24) of the scroll compressor (10), the lower space (24) becomes a high-pressure atmosphere, and the oil in the oil reservoir (21) also becomes high-pressure. The high-pressure oil in the oil reservoir (21) flows upward through the oil supply hole (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 boss portion (73) of the movable scroll (70).

[0052] The oil supplied to the boss portion (73) is supplied to 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) is placed in a high-pressure atmosphere corresponding to the discharge pressure of the compression mechanism (40). The high pressure in the recess (53) presses the movable scroll (70) against the fixed scroll (60).

[0053] The high-pressure oil accumulated in the recess (53) flows through the oil passage (55) and into the fixed-side oil groove (81) (not shown). As a result, high-pressure oil corresponding to the discharge pressure of the compression mechanism (40) is supplied to the fixed-side oil groove (81).

[0054] Furthermore, intermediate-pressure refrigerant is intermittently supplied to the back pressure chamber (54) from the compression chamber (S) which is in an intermediate-pressure state, whereby the back pressure chamber (54) is filled with an atmosphere of a predetermined intermediate pressure.

[0055] In this state, when the movable scroll (70) rotates eccentrically, the inner oil supply operation, the outer oil supply operation, and the back pressure adjustment operation are performed in this order. In all of these operations, the oil in the fixed-side oil groove (81) is used to lubricate the surrounding sliding surfaces.

[0056] <Inner oil supply operation> When the movable scroll (70) reaches, for example, the eccentric angle position shown in Fig. 5, an inside-oil-supply operation is performed. In the inside-oil-supply operation, the communication port (87) and the oil supply groove (86) communicate with each other, and oil in the back pressure chamber (54) is supplied to the oil supply groove (86). The oil supplied to the oil supply groove (86) is supplied to the suction port (64) of the compression chamber (S).

[0057] In this embodiment, in order to facilitate the supply of oil toward the inner chamber (S2), the period during which the communication port (87) and the oil supply groove (86) communicate with each other is set appropriately.

[0058] Specifically, the communication port (87) and the oil supply groove (86) are made to communicate with each other within a specified period during which the thickness direction central position (C2) of the suction side end of the movable side wrap (72) is located radially outward from the wrap spacing central position (C1) of the fixed side wrap (62).

[0059] 5, the communication port (87) and the oil supply groove (86) begin to communicate with each other at the timing when the movable scroll (70) is completely closed for suction. The period during which the communication port (87) and the oil supply groove (86) communicate with each other is determined by appropriately setting the position of the communication port (87) and the groove width of the oil supply groove (86).

[0060] As a result, as shown by the arrows in Figure 5, oil in the back pressure chamber (54) flows toward the inner chamber (S1) through the communication port (87), the oil supply groove (86), and the suction port (64), thereby improving the oil sealing performance of the inner chamber (S2).

[0061] When the movable scroll (70) in the eccentric angle position in Fig. 5 further rotates eccentrically to reach, for example, the eccentric angle position in Fig. 6, the entire communication port (87) is located within the oil supply groove (86). Even at this timing, the center position (C2) of the movable side wrap (72) is located radially outward of the center position (C1) of the wrap interval of the fixed side wrap (62), making it easier for oil to be supplied to the inner chamber (S2) (see the arrows in Fig. 6).

[0062] Then, when the movable scroll (70), which is in the eccentric angle position in Figure 6, further eccentrically rotates and reaches, for example, the eccentric angle position in Figure 7, communication between the communication port (87) and the oil supply groove (86) is about to end. At this timing, the center position (C2) of the movable wrap (72) and the center position (C1) of the wrap interval of the fixed wrap (62) approximately coincide with each other, so that oil is distributed to the inner chamber (S2) and the outer chamber (S1) (see the arrows in Figure 7).

[0063] <External oil supply operation> When the movable scroll (70) in the eccentric angle position of Fig. 7 further rotates eccentrically to reach, for example, the eccentric angle position of Fig. 8, an outer oil-supply operation is performed. In the outer oil-supply operation, the fixed oil groove (81) and the movable oil groove (82) communicate with each other, and the oil in the fixed oil groove (81) is transferred to the movable oil groove (82). At this time, the portion of the movable oil groove (82) that is bent radially inward communicates with the outer chamber (S1), and therefore the oil in the movable oil groove (82) is supplied to the outer chamber (S1). This can improve the oil sealing performance of the outer chamber (S1).

[0064] <Back pressure adjustment operation> 8, a back pressure adjustment operation is also performed. In the back pressure adjustment operation, the communication port (87) and the intermediate pressure groove (83) are communicated with each other. As a result, refrigerant in the outer chamber (S1) in an intermediate pressure state is supplied to the back pressure chamber (54) through the intermediate pressure groove (83) and the communication port (87). As a result, the back pressure chamber (54) is brought into an atmosphere of a predetermined intermediate pressure.

[0065] As also shown in FIG. 9, after the back pressure adjusting operation, the inside oil supplying operation is performed again, and then the outside oil supplying operation and the back pressure adjusting operation are repeatedly performed in this order.

[0066] In this embodiment, the period during which the communication port (87) and the oil supply section (86) communicate with each other is set based on the suction closing angle of the outer chamber (S1).

[0067] Specifically, when the suction closing angle of the outer chamber (S1) is set to 0°, the oil supply groove (86) is communicated with within a predetermined period during which the movable scroll (70) rotates within a range of 0° to 100° inclusive. Here, the predetermined period is represented by the rotation angle θ of the movable scroll (70) and is determined by the position of the communication port (87) and the groove width of the oil supply groove (86).

[0068] This makes it possible to supply oil to the inner chamber (S2) of the compression chamber (S) at a predetermined timing.

[0069] -Effects of the embodiment- The scroll compressor (10) of this embodiment includes a fixed scroll (60) and a movable scroll (70) that defines a compression chamber (S) between the fixed scroll (60) and the fixed scroll (60). The scroll compressor (10) includes a back pressure chamber (54) that applies an intermediate pressure between the suction pressure and the discharge pressure of the compression chamber (S) to a surface of the movable scroll (70) opposite to the sliding surface thereof, an outer oil supply mechanism (80) that supplies oil to an outer chamber (S1) that is radially outward of a movable side wrap (72) of the movable scroll (70) in the compression chamber (S), and an inner oil supply mechanism (85) that supplies oil to an inner chamber (S2) that is radially inward of the movable side wrap (72) of the movable scroll (70) in the compression chamber (S). The fixed scroll (60) has an oil supply groove (86) (oil supply portion) provided in the sliding surface of the movable scroll (70) and communicating with the suction region of the compression chamber (S), and a communication port (87) penetrating the sliding surface of the movable scroll (70) and communicating with the back pressure chamber (54). The communication port (87) communicates with the oil supply groove (86) during one rotation of the movable scroll (70) within a predetermined period during which a center position (C2) in the thickness direction of the wrap end on the suction side of the movable scroll (70) is located radially outward from a center position (C1) of the wrap spacing of the fixed scroll (60).

[0070] In this embodiment, the compressor includes an outer oil supply mechanism (80) that supplies oil to the outer chamber (S1) of the compression chamber (S), and an inner oil supply mechanism (85) that supplies oil to the inner chamber (S2). The inner oil supply mechanism (85) has an oil supply groove (86) and a communication port (87). The communication port (87) and the oil supply groove (86) communicate with each other during a predetermined period during which a center position (C2) in the thickness direction of a wrap end on the suction side of the movable scroll (70) is located radially outward from a center position (C1) of the wrap interval of the fixed scroll (60).

[0071] This makes it possible to supply oil to spaces inward and outward in the radial direction of the compression chamber (S) from the movable scroll (70).

[0072] In addition, the scroll compressor (10) of this embodiment has an intermediate pressure groove (83) (intermediate pressure section) provided on the sliding surface of the movable scroll (70) and communicating with the compression chamber (S) during compression, and the communication port (87) alternately communicates with the oil supply groove (86) and the intermediate pressure groove (83) during one rotation of the movable scroll (70).

[0073] In this embodiment, during one rotation of the movable scroll (70), the communication port (87) is alternately brought into communication with the oil feed groove (86) and the intermediate pressure groove (83).

[0074] As a result, intermediate-pressure refrigerant is intermittently supplied from the compression chamber (S) in an intermediate-pressure state to the back pressure chamber (54), so that the back pressure chamber (54) can be kept at a predetermined intermediate pressure.

[0075] In addition, in the scroll compressor (10) of this embodiment, when the suction closing angle of the outer chamber (S1) is 0°, the communication port (87) is connected to the oil supply groove (86) within a predetermined period while the movable scroll (70) rotates in the range of 0° or more and 100° or less.

[0076] In this embodiment, the period during which the communication port (87) and the oil supply groove (86) communicate with each other is set based on the suction closing angle of the outer chamber (S1), thereby making it possible to supply oil to the inner chamber (S2) of the compression chamber (S) at a predetermined timing.

[0077] Although the embodiments and modifications have been described above, it will be understood that various modifications of form and details are possible without departing from the spirit and scope of the claims. Furthermore, the above embodiments and modifications may be appropriately combined or substituted as long as the functions of the subject of the present disclosure are not impaired. [Industrial Applicability]

[0078] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for scroll compressors. [Explanation of symbols]

[0079] 10 Scroll Compressor 54 Back pressure chamber 60 Fixed Scroll 62 Fixed side wrap 70 Movable Scroll 72 Movable side wrap 80 Outside oil supply mechanism 83 Intermediate pressure groove (intermediate pressure section) 85 Internal oil supply mechanism 86 Oil groove (oil supply part) 87 Communication port C1 center position C2 center position S Compression chamber S1 outer chamber S2 Inner chamber

Claims

1. A scroll compressor including a fixed scroll (60) and a movable scroll (70) that forms a compression chamber (S) between the fixed scroll (60), a back pressure chamber (54) for applying an intermediate pressure between a suction pressure and a discharge pressure of the compression chamber (S) to a surface of the movable scroll (70) opposite to a sliding surface of the movable scroll (70); an outer oil supply mechanism (80) that supplies oil to an outer chamber (S1) in the compression chamber (S) that is radially outer than a wrap (72) of the movable scroll (70); an inner oil supply mechanism (85) that supplies oil to an inner chamber (S2) in the compression chamber (S) that is radially inward of the wrap (72) of the movable scroll (70); an intermediate pressure portion (83) provided on a sliding surface of the fixed scroll (60) and communicating with the compression chamber (S) during compression, The inside oil supply mechanism (85) includes an oil supply portion (86) provided on the sliding surface of the fixed scroll (60) and communicating with a suction region of the compression chamber (S), and a communication port (87) penetrating the sliding surface of the movable scroll (70) and communicating with the back pressure chamber (54), the communication port (87) communicates with the oil supply portion (86) within a predetermined period during which, during one rotation of the movable scroll (70), a center position (C2) in a thickness direction of a wrap end portion on the suction side of the movable scroll (70) is located radially outward from a center position (C1) of a wrap interval of the fixed scroll (60); The communication port (87) alternately communicates with the oil supply section (86) and the intermediate pressure section (83) during one rotation of the movable scroll (70).

2. In claim 1, The communication port (87) communicates with the oil supply section (86) within a predetermined period during which the movable scroll (70) rotates within a range of 0° or more and 100° or less when the suction closing angle of the outer chamber (S1) is 0°.

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