SCROLL COMPRESSOR

Abstract

A scroll compressor (10) has a rotating shaft (15), a housing (11), a fixed scroll (25), an orbiting scroll (26), a suction pressure region, a compression chamber (27), a discharge pressure region, a back pressure chamber, a supply passage (51), a supply mechanism, and a temporary discharge passage (60). The housing (11) has a discharge passage (70) connecting the back pressure chamber (50) to the discharge pressure region. The discharge passage (70) has a discharge valve (80) configured to switch between a discharge state in which the flow of refrigerant from the back pressure chamber (50) to the discharge pressure region is permitted and a non-discharge state in which the flow of refrigerant from the back pressure chamber (50) to the discharge pressure region is prevented. The discharge valve (80) is brought into the discharge state when a pressure in the back pressure chamber (50) is higher than a pressure in the discharge pressure region.

Description

[0001] The present invention relates to a scroll compressor. TECHNICAL BACKGROUND

[0002] The scroll compressor has a housing, a rotating shaft, a fixed scroll, and an orbiting scroll. The housing has a support member. The rotating shaft is rotatably supported by the housing. The fixed scroll is fixed to the housing. The orbiting scroll is arranged between the support member and the fixed scroll. The orbiting scroll rotates relative to the fixed scroll with the rotation of the rotating shaft.

[0003] The scroll compressor has a compression chamber, a discharge chamber, and a backpressure chamber. Refrigerant is drawn into the compression chamber from a suction pressure region located on an outer peripheral side of the orbiting scroll. The scroll compressor compresses refrigerant in the compression chamber with the orbiting movement of the orbiting scroll relative to the fixed scroll. The compressed refrigerant is discharged from the compression chamber to the discharge chamber. The backpressure chamber is defined between the orbiting scroll and the support member. The refrigerant introduced into the backpressure chamber forces the orbiting scroll toward the fixed scroll.

[0004] For example, Japanese Patent Application Publication No. 2013-204457 discloses a scroll compressor having a supply passage and a communication groove as an intermittent discharge passage. During operation, the scroll compressor supplies a portion of the refrigerant compressed in the compression chamber from the compression chamber to the backpressure chamber through the supply passage. The supply passage blocks the backpressure chamber from the discharge chamber when the pressure in the backpressure chamber exceeds the pressure in the discharge chamber. The communication groove temporarily provides communication between the backpressure chamber and the suction pressure region with an orbiting motion of the orbiting scroll.

[0005] In a scroll compressor, purge for maintenance or the like may be performed after operation is stopped. In the stopped scroll compressor, even if the pressure in the backpressure chamber exceeds the pressure in the discharge chamber, a refrigerant in the backpressure chamber is discharged through the temporary discharge passage because the backpressure chamber is blocked from the discharge chamber by the supply passage. However, depending on a position of the orbiting scroll, when the scroll compressor is stopped, a refrigerant in the backpressure chamber may not be discharged through the temporary discharge passage. SUMMARY

[0006] According to one aspect of the present invention, a scroll compressor is provided, comprising: a rotary shaft; a housing having a support member that supports the rotary shaft; a fixed scroll fixed to the housing; an orbiting scroll disposed between the support member and the fixed scroll and configured to orbit relative to the fixed scroll with rotation of the rotary shaft; a suction pressure region formed in the housing into which refrigerant is drawn; a compression chamber defined by the orbiting scroll and the fixed scroll, in which the refrigerant drawn into the suction pressure region is compressed; a discharge pressure region formed in the housing, the discharge pressure region having a discharge chamber to which the refrigerant compressed in the compression chamber is discharged.a backpressure chamber defined between the orbiting scroll and the support member, into which the refrigerant is introduced to urge the orbiting scroll toward the fixed scroll; a supply passage through which a portion of the refrigerant compressed in the compression chamber is supplied to the backpressure chamber; a supply mechanism configured to switch between a supply state allowing the refrigerant to flow from the compression chamber to the backpressure chamber and a non-supply state blocking the flow of the refrigerant from the compression chamber to the backpressure chamber in the supply passage;an intermittent discharge passage disposed in the support member and configured to temporarily provide communication between the backpressure chamber and the suction pressure region with an orbiting motion of the orbiting scroll. The casing has a discharge passage connecting the backpressure chamber to the discharge pressure region, the discharge passage having a discharge valve configured to switch between a discharge state allowing the flow of refrigerant from the backpressure chamber to the discharge pressure region and a non-discharge state blocking the flow of refrigerant from the backpressure chamber to the discharge pressure region, and the discharge valve being brought into the discharge state when a pressure of the backpressure chamber is higher than a pressure in the discharge pressure region. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the embodiments together with the accompanying drawings. Fig. 1 is a cross-sectional view of a scroll compressor; Fig. 2 is a partially enlarged cross-sectional view of the scroll compressor; Fig. 3 is a partially enlarged cross-sectional view of the scroll compressor; Fig. 4 is a partially enlarged cross-sectional view of the scroll compressor; Fig. 5 is a partially enlarged cross-sectional view of a scroll compressor according to a modification; and Fig. 6 is a partially enlarged cross-sectional view of a scroll compressor according to the modification. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0008] The following describes an embodiment of a scroll compressor with reference to Fig. 1 to 4. Basic design of the scroll compressor

[0009] As in Fig. As shown in Figure 1, a scroll compressor 10 has a casing 11 having a tubular shape. The casing 11 includes a motor casing 12, a support member 13, and a discharge casing 14. Thus, the casing 11 includes the support member 13 and the discharge casing 14. The motor casing 12, the support member 13, and the discharge casing 14 are made of a metal material. The motor casing 12, the support member 13, and the discharge casing 14 are made of, for example, aluminum. The scroll compressor 10 has a rotating shaft 15. The rotating shaft 15 is housed in the casing 11. Engine housing

[0010] The motor housing 12 has a motor housing end wall 12a having a plate shape and a motor housing peripheral wall 12b having a tubular shape. The motor housing peripheral wall 12b extends in a tubular shape from an outer peripheral portion of the motor housing end wall 12a. An axial direction of the motor housing peripheral wall 12b coincides with an axial direction of the rotary shaft 15. The motor housing 12 has a plurality of internally threaded holes 12c. The internally threaded holes 12c are formed at an opening end of the motor housing peripheral wall 12b. It should be noted that only one of the internally threaded holes 12c in Fig. 1. The motor housing 12 has an inlet port 12h. A refrigerant is drawn through the inlet port 12h. The inlet port 12h is formed in a portion of the motor housing peripheral wall 12b located on the side of the motor housing end wall 12a. The inlet port 12h provides communication between an inside and an outside of the motor housing 12.

[0011] The motor housing 12 has a housing hub 12d having a cylindrical shape. The housing hub 12d protrudes from a central portion of an inner surface of the motor housing end wall 12a. A first end of the rotary shaft 15, which corresponds to one end of the rotary shaft 15 in the axial direction, is fitted into the housing hub 12d. The scroll compressor 10 has a first bearing 16. The first bearing 16 is, for example, a rolling bearing. The first bearing 16 is disposed between an inner peripheral surface of the housing hub 12d and an outer peripheral surface of the first end of the rotary shaft 15. The first end of the rotary shaft 15 is rotatably supported by the motor housing 12 via the first bearing 16. Support component

[0012] The support member 13 has an end wall 17 having a plate shape and a peripheral wall 18 having a tubular shape. The peripheral wall 18 extends in a tubular shape from an outer peripheral portion of the end wall 17. An axial direction of the peripheral wall 18 coincides with the axial direction of the rotary shaft 15. The support portal 13 also has a flange wall 19 having an annular shape. The flange wall 19 extends outward in a radial direction of the rotary shaft 15 from an end portion of the outer peripheral surface of the peripheral wall 18 on the side opposite the end wall 17.

[0013] The rotary shaft 15 is inserted through the central portion of the support member 13. An end surface of the second end of the rotary shaft 15 is located inside the peripheral wall 18.

[0014] The scroll compressor 10 has a second bearing 21. The second bearing 21 is a rolling bearing. The second bearing 21 is arranged between an inner peripheral surface of the peripheral wall 18 and the outer peripheral surface of the rotating shaft 15. The rotating shaft 15 is rotatably supported by the support member 13 via the second bearing 21. Therefore, the support member 13 rotatably supports the rotating shaft 15. Thus, the housing 11 has the support member 13 that supports the rotating shaft 15.

[0015] The support member 13 has a plurality of motor-side bolt insertion holes 19a. The motor-side bolt insertion holes 19a are formed in an outer peripheral portion of the flange wall 19. The motor-side bolt insertion holes 19a each extend through the flange wall 19 in a thickness direction thereof. The motor-side bolt insertion holes 19a are in communication with their corresponding internally threaded holes 12c. It should be noted that only one of the motor-side bolt insertion holes 19a in Fig. 1 is shown. Intake pressure region

[0016] The scroll compressor 10 has a motor chamber 20. The motor chamber 20 is defined by the motor housing 12 and the support member 13. Thus, the motor housing 12 and the support member 13 cooperate to define the motor chamber 20. In this way, the motor chamber 20 is formed in the housing 11. The motor chamber 20 communicates with the inlet port 12h. Refrigerant is drawn into the motor chamber 20 through the inlet port 12h. Refrigerant in the motor chamber 20 contains oil. The motor chamber 20 is a suction pressure region into which a refrigerant containing oil is drawn. As described above, the scroll compressor 10 has the motor chamber 20 as the suction pressure region into which the refrigerant is drawn. The suction pressure region is provided inside the housing 11. Motor

[0017] The scroll compressor 10 has a motor 22. The motor 22 is housed in the motor chamber 20. The motor 22 has a stator 23 having a tubular shape and a rotor 24 having a tubular shape. The rotor 24 is arranged inside the stator 23. The rotor 24 rotates together with the rotating shaft 15. The stator 23 surrounds the rotor 24. The rotor 24 has a rotor core 24a fixed to the rotating shaft 15 and a plurality of permanent magnets (not shown) arranged in the rotor core 24a.

[0018] The stator 23 has a stator core 23a having a tubular shape and a motor coil 23b. The stator core 23a is fixed to the inner peripheral surface of the motor housing peripheral wall 12b of the motor housing 12. The motor coil 23b is wound around the stator core 23a. Then, electric power controlled by an inverter (not shown) is supplied to the motor coil 23b, causing the rotor 24 to rotate. Thus, the rotor 24 rotates together with the rotating shaft 15. Consequently, the motor 22 rotates the rotating shaft 15. compression mechanism

[0019] The scroll compressor 10 has a compression mechanism C1. The compression mechanism C1 is of a scroll type, which includes a fixed scroll 25 and an orbiting scroll 26. That is, the scroll compressor 10 has the fixed scroll 25 and the orbiting scroll 26. The fixed scroll 25 and the orbiting scroll 26 are arranged on a side of the support member 13 opposite the motor chamber 20 across the support member 13. The fixed scroll 25 is fixed to the housing 11. The orbiting scroll 26 is arranged between the support member 13 and the fixed scroll 25. The orbiting scroll 26 makes an orbital movement relative to the fixed scroll 25 with the rotation of the rotary shaft 15. Fixed screw

[0020] The fixed screw 25 has a fixed screw base plate 25a and a fixed screw spiral wall 25b. The fixed screw base plate 25a has a disc shape. A thickness direction of the fixed screw base plate 25a coincides with the axial direction of the rotary shaft 15. A discharge port 25h is formed at the center of the fixed screw base plate 25a. The discharge port 25h has a circular hole shape. The discharge port 25h extends through the fixed screw base plate 25a in the thickness direction thereof. The fixed screw spiral wall 25b extends from the fixed screw base plate 25a. Furthermore, the fixed screw 25 has an outer peripheral wall 25c. The outer peripheral wall 25c extends from an outer peripheral portion of the fixed screw base plate 25a. The outer peripheral wall 25c surrounds the fixed screw spiral wall 25b.

[0021] A recess 25e is formed in a fixed screw end surface 25d of the outer peripheral wall 25c. The recess 25e has a circular hole shape. The recess 25e has a recess bottom surface 25f. The recess bottom surface 25f is flat. The recess bottom surface 25f is located in the same plane as a distal end surface of the fixed screw spiral wall 25b.

[0022] The scroll compressor 10 has a discharge valve 25v. The discharge valve 25v is mounted on the fixed scroll base plate 25a. The discharge valve 25v is designed to open or close the discharge port 25h. Rotating screw

[0023] The orbiting screw 26 has an orbiting screw base plate 26a and an orbiting screw spiral wall 26b. The orbiting screw base plate 26a has a disc shape. A thickness direction of the orbiting screw base plate 26a coincides with the axial direction of the rotary shaft 15. The orbiting screw base plate 26a faces the fixed screw base plate 25a. The orbiting screw spiral wall 26b extends from the orbiting screw base plate 26a to the fixed screw base plate 25a. The orbiting screw spiral wall 26b engages with the fixed screw spiral wall 25b. The orbiting screw base plate 26a is located inside the recess 25e. The orbiting screw 26 makes an orbital movement with the orbiting screw base plate 26a positioned inside the recess 25e. The rotating screw base plate 26a can be placed in sliding contact with the distal end surface of the fixed screw spiral wall 25b.Thus, the orbiting screw base plate 26a has a portion that can be placed in sliding contact with the distal end of the fixed screw spiral wall 25b. A portion of the orbiting screw base plate 26a that is positioned outward relative to the orbiting screw spiral wall 26b in the radial direction of the rotary shaft 15 can be placed in sliding contact with the recess bottom surface 25f. Thus, the portion of the orbiting screw base plate 26a that is positioned outward relative to the orbiting screw spiral wall 26b in the radial direction of the rotary shaft 15 is the portion of the orbiting screw base plate 26a that can be placed in sliding contact with the fixed screw 25. The recess bottom surface 25f is a portion of the fixed screw 25 that can be placed in sliding contact with the orbiting screw base plate 26a.A distal end surface of the orbiting screw spiral wall 26b can be placed in sliding contact with the fixed screw base plate 25a. Thus, the fixed screw base plate 25a has a portion that can be placed in sliding contact with the distal end of the orbiting screw spiral wall 26b.

[0024] The scroll compressor 10 has a compression chamber 27. The compression chamber 27 is defined by the fixed scroll base plate 25a, the fixed scroll spiral wall 25b, the orbiting scroll base plate 26a, and the orbiting scroll spiral wall 26b. Thus, the compression chamber 27 is defined between the fixed scroll 25 and the orbiting scroll 26. The compression chamber 27 is formed between the fixed scroll 25 and the orbiting scroll 26. The compression chamber 27 draws in and compresses refrigerant drawn into the motor chamber 20. Thus, the compression chamber 27 compresses refrigerant drawn into the suction pressure region.

[0025] The orbiting screw base plate 26a has an orbiting screw hub 26c having a cylindrical shape. The orbiting screw hub 26c protrudes from an end surface 26e of the orbiting screw base plate 26a opposite to the fixed screw base plate 25a. An axial direction of the orbiting screw hub 26c coincides with the axial direction of the rotating shaft 15. The orbiting screw base plate 26a has a plurality of grooves 26d. The grooves 26d are formed around the orbiting screw hub 26c in the orbiting screw base plate end surface 26e. The grooves 26d are arranged at predetermined intervals in a circumferential direction of the rotating shaft 15. It should be noted that only one of the grooves 26d in Fig. 1. A ring member 28 having a ring shape is fitted into each of the grooves 26d. A pin 29 is inserted into the ring member 28. The pin 29 protrudes from a support member end surface 13e of the support member 13 on the orbiting scroll 26 side.

[0026] The scroll compressor 10 has an elastic plate 30. The elastic plate 30 has a ring shape. The elastic plate 30 is held between the support member end surface 13e and the fixed scroll end surface 25d of the outer peripheral wall 25c. The elastic plate 30 constantly urges the orbiting scroll 26 toward the fixed scroll 25.

[0027] The scroll compressor 10 has an eccentric shaft 31. The eccentric shaft 31 protrudes toward the orbiting scroll 26 from the end surface of the second end of the rotating shaft 15 at a position eccentric to a center axis L1 of the rotating shaft 15. The eccentric shaft 31 is integrally formed with the rotating shaft 15. An axial direction of the eccentric shaft 31 extends in the same direction as the axial direction of the rotating shaft 15. The eccentric shaft 31 is inserted into the orbiting scroll hub 26c.

[0028] The scroll compressor 10 has a balance weight 32 and a sleeve 33. The sleeve 33 is fitted to an outer peripheral surface of the eccentric shaft 31. The balance weight 32 is integrated into the sleeve 33. The balance weight 32 is housed inside the support member 13. The orbiting scroll 26 is supported by the eccentric shaft 31 via the sleeve 33 and the rolling bearing 34 and is rotatable relative to the eccentric shaft 31. Therefore, the rolling bearing 34 supports the orbiting scroll 26 to be rotatable relative to the eccentric shaft 31.

[0029] The rotation of the rotating shaft 15 is transmitted to the orbiting scroll 26 through the eccentric shaft 31, the bushing 33, and the rolling bearing 34. This causes the orbiting scroll 26 to rotate. The pins 29, which are in contact with their corresponding inner peripheral surfaces of the ring members 28, prevent the orbiting scroll 26 from rotating and only allow the orbiting scroll 26 to orbit. Thus, the orbiting scroll 26 orbits while the orbiting scroll wall 26b is in contact with the fixed scroll wall 25b. The volume of the compression chamber 27 decreases with orbiting movement of the orbiting scroll 26, thereby compressing a refrigerant in the compression chamber 27. The balance weight 32 balances a centrifugal force acting on the orbiting scroll 26 when the orbiting scroll 26 orbits. This reduces the imbalance amount or-circumference of the rotating screw 26. Dispensing housing

[0030] The discharge casing 14 has a discharge casing end wall 14a having a plate shape and a discharge casing peripheral wall 14b having a tubular shape. The discharge casing peripheral wall 14b extends in a tubular shape from an outer peripheral portion of the discharge casing end wall 14a. An axial direction of the discharge casing peripheral wall 14b coincides with the axial direction of the rotary shaft 15. The discharge casing peripheral wall 14b has a discharge casing end surface 14d at an end of the discharge casing peripheral wall 14b in the axial direction that is not connected to the discharge casing end wall 14a. The discharge casing peripheral wall 14b surrounds the fixed scroll 25. Thus, the fixed scroll 25 is housed in the casing 11.

[0031] The discharge housing 14 has a plurality of discharge-side bolt insertion holes 14c. The discharge-side bolt insertion holes 14c are formed in the discharge housing peripheral wall 14b. It should be noted that only one of the discharge-side bolt insertion holes 14c in Fig. 1. The output-side bolt insertion holes 14c are in communication with their corresponding motor-side bolt insertion holes 19a.

[0032] Bolts B1 inserted through the output-side bolt insertion holes 14c and the motor-side bolt insertion holes 19a are respectively screwed into the internally threaded holes 12c of the motor housing 12. As a result, the support member 13 is connected to the motor housing peripheral wall 12b, and the output housing 14 is connected to the flange wall 19. Accordingly, the output housing 19 is connected to the support member 13. The output housing end surface 14d faces in a direction in which the output housing end surface 14d faces the support member end surface 13e. Thus, the motor housing 12, the support member 13, and the output housing 14 are arranged in this order in the axial direction of the rotary shaft 15. The fixed worm 25 is held between the output housing end wall 14a and the support member 13. In this way, the fixed screw 25 is fixed to the housing L. The discharge housing 14 is connected to the fixed screw 25.

[0033] The scroll compressor 10 has a first seal member 401 as a sealing component. The first seal member 401 is made of resin in the form of a thin plate. The first seal member 401 has an annular shape. The first seal member 401 provides a seal between the support member 13 and the discharge housing 14. The discharge housing end surface 14d faces the support member end surface 13e, with the first seal member 401 interposed therebetween. The first seal member 401 is arranged outwardly relative to the elastic plate 30 in the radial direction of the rotary shaft 15 and between the support member 13 and the discharge housing 14. That is, the first seal member 401 is located between the support member 13 and the discharge housing 14.

[0034] The first sealing member 401 has a sealing member hole 401a as a sealing hole. The sealing member hole 401a extends through the first sealing member 401 in a thickness direction thereof.

[0035] The scroll compressor 10 has a second sealing member 402 that has a plate shape. The second sealing member 402 is made of a metal that has a thin plate shape. The second sealing member 402 has an annular shape. The second sealing member 402 provides a seal between the discharge housing end wall 14a and the fixed scroll base plate 25a. Intake passage

[0036] The scroll compressor 10 has a suction passage 35. The suction passage 35 has a plurality of first grooves 36, a plurality of first holes 37, and a plurality of second grooves 38. The first grooves 36 are formed in the inner peripheral surface of the motor housing peripheral wall 12b of the motor housing 12. The first grooves 36 are each opened at an opening end of the motor housing peripheral wall 12b. The first holes 37 are formed in an outer peripheral portion of the flange wall 19. The first holes 37 each extend through the flange wall 19 in a thickness direction thereof. The first holes 37 are in communication with their corresponding first grooves 36. The second grooves 38 are formed in an inner peripheral surface of the discharge housing peripheral wall 14b. The second grooves 38 are in communication with their corresponding first holes 37.

[0037] A suction port 39 is formed in the outer peripheral wall 25c of the fixed scroll 25. The suction port 39 extends through the outer peripheral wall 25c in a thickness direction thereof. The suction port 39 communicates with the second grooves 38. The suction port 39 communicates with an outermost peripheral portion of the compression chamber 27.

[0038] A refrigerant in the motor chamber 20 passes through the first grooves 36, the first holes 37, the second grooves 38, and the suction port 39 and is drawn into the compression chamber 27. The suction passage 35, which includes the first grooves 36, the first holes 37, and the second grooves 38, and the suction port 39 are a suction pressure region through which a refrigerant flows to be drawn into the compression chamber 27. A refrigerant drawn into the compression chamber 27 is compressed in the compression chamber 27 with an orbiting motion of the orbiting scroll 26. In this way, the compression mechanism C1 compresses a refrigerant introduced to the housing 11. Delivery pressure region

[0039] The scroll compressor 10 has a discharge pressure region. The discharge pressure region is provided inside the housing 11. The discharge pressure region is a region that includes a discharge chamber 41, an oil separation chamber 43, and an outlet port 45. Refrigerant compressed by the compression mechanism C1 is discharged from the discharge port 25h to the discharge pressure region.

[0040] The scroll compressor 10 has the discharge chamber 41. The discharge chamber 41 is provided inside the casing 11. The discharge chamber 41 is formed between the fixed scroll base plate 25a and the discharge casing end wall 14a. The discharge chamber 41 communicates with the discharge port 25h. A refrigerant compressed in the compression chamber 27 is discharged to the discharge chamber 41 through the discharge port 25h.

[0041] The scroll compressor 10 has an oil storage chamber 42. The oil storage chamber 42 is formed between the discharge casing end wall 14a and the fixed scroll base plate 25a. The oil storage chamber 42 is arranged vertically below the discharge chamber 41. Oil separated from the refrigerant discharged to the discharge chamber 41 is stored in the oil storage chamber 42. The second sealing member 402 provides a seal between the discharge chamber 41 and the oil storage chamber 42.

[0042] The scroll compressor 10 has the oil separation chamber 43. The oil separation chamber 43 is formed inside the discharge housing 14. An outer tube 44, which has a long and narrow tubular shape, is formed on a portion of the discharge housing end wall 14a. The oil separation chamber 43 is formed inside the outer tube 44. A first end of the outer tube 44 serves as an outlet port 45 through which refrigerant is discharged to an outside. The outlet port 45 is in communication with the oil separation chamber 43. A second end of the outer tube 44 is in communication with the oil storage chamber 42. That is, the oil separation chamber 43 is in communication with the oil storage chamber 42 via the outer tube 44.

[0043] An inner tube 46 is fitted into the oil separation chamber 43. An axial direction of the inner tube 46 coincides with the radial direction of the rotary shaft 15. A first end of the inner tube 46 is in communication with the outlet port 45. A second end of the inner tube 46 is in communication with an interior of the oil separation chamber 43 on a side opposite to the outlet port 45. Furthermore, an introduction hole 47 is formed in the outer tube 44. The introduction hole 47 provides communication between the discharge chamber 41 and the oil separation chamber 43. Refrigerant discharged to the discharge chamber 41 is introduced into the oil separation chamber 43 through the introduction hole 47.

[0044] A refrigerant compressed in the compression chamber 27 and discharged to the discharge chamber 41 through the discharge port 25h is introduced into the oil separation chamber 43 through the introduction hole 47. The refrigerant introduced into the oil separation chamber 43 swirls around the inner tube 46. As a result, centrifugal force is applied to an oil contained in the refrigerant, causing the oil to be separated from the refrigerant in the oil separation chamber 43. Accordingly, the oil contained in the refrigerant discharged to the discharge chamber 41 is separated in the oil separation chamber 43.

[0045] The refrigerant from which the oil has been separated flows into and through the inner tube 46. Then, the refrigerant that has passed through the inner tube 46 flows out to an external refrigerant circuit (not shown) through the outlet port 45. The oil that has been separated from the refrigerant in the oil separation chamber 43 flows to the oil storage chamber 42 by its own weight and is stored in the oil storage chamber 42. Backpressure chamber

[0046] The scroll compressor 10 has a backpressure chamber 50. The backpressure chamber 50 is formed inside the housing 11. The backpressure chamber 50 is defined between the orbiting scroll 26 and the support member 13. The backpressure chamber 50 is formed between the orbiting scroll base plate 26a and the support member 13. The backpressure chamber 50 is formed on a side of the orbiting scroll base plate 26a opposite the fixed scroll base plate 25a. The support member 13 separates the backpressure chamber 50 and the motor chamber 20. A refrigerant for urging the orbiting scroll 26 toward the fixed scroll 25 is introduced into the backpressure chamber 50. The rolling bearing 34 is a bearing arranged in the backpressure chamber 50. Thus, the rolling bearing 34, which supports the orbiting worm 26 so that the orbiting worm 26 is rotatable relative to the eccentric shaft 31, is arranged in the back pressure chamber 50. Feed passage

[0047] The scroll compressor 10 has a supply passage 51. The supply passage 51 is formed in the orbiting scroll 26. A first end of the supply passage 51 opens at the distal end of the orbiting scroll wall 26b. The first end of the supply passage 51 is connectable to the compression chamber 27. A second end of the supply passage 51 is connected to the backpressure chamber 50. The supply passage 51 extends through an inner end of the orbiting scroll wall 26b, which converges in a spiral shape toward the center of the orbiting scroll 26, and the orbiting scroll base plate 26a. The supply passage 51 opens at the distal end of the rotating screw spiral wall 26b and is connectable to the compression chamber 27 at the first end and is in communication with the back pressure chamber 50 at the second end.The supply passage 51 allows a portion of the refrigerant compressed in the compression chamber 27 to be supplied to the backpressure chamber 50. Thus, the pressure in the backpressure chamber 50 is higher than that in the motor chamber 20.

[0048] The scroll compressor 10 has a supply mechanism D1. The supply mechanism D1 is formed of the fixed scroll 25 and the orbiting scroll 26. The supply mechanism D1 controls the flow of refrigerant in the supply passage 51.

[0049] When the pressure in the backpressure chamber 50 is higher than the pressure in the compression chamber 27, the orbiting scroll 26 is urged toward the fixed scroll 25 due to the pressure gradient between the backpressure chamber 50 and the compression chamber 27. Thus, the distal end of the orbiting scroll spiral wall 26b is pressed against the fixed scroll base plate 25a. As a result, the first end of the supply passage 51 is closed by the orbiting scroll spiral wall 26b, so that the flow of refrigerant from the compression chamber 27 to the backpressure chamber 50 is blocked. That is, in this case, the fixed scroll 25 and the orbiting scroll 26 are in a state that blocks the flow of refrigerant from the compression chamber 27 to the backpressure chamber 50.Hereinafter, the state in which the fixed scroll 25 and the orbiting scroll 26 block the flow of refrigerant from the compression chamber 27 to the backpressure chamber 50 is referred to as a non-supply state. That is, when the pressure in the backpressure chamber 50 is higher than the pressure in the compression chamber 27, the supply mechanism D1 is in the non-supply state.

[0050] When the pressure in the backpressure chamber 50 is lower than the pressure in the compression chamber 27, the orbiting scroll 26 is urged in a direction away from the fixed scroll 25 due to the pressure gradient between the backpressure chamber 50 and the compression chamber 27. Thus, the distal end of the orbiting scroll spiral wall 26b moves away from the fixed scroll base plate 25a. As a result, the supply passage 51 allows the flow of refrigerant from the compression chamber 27 to the backpressure chamber 50. That is, in this case, the fixed scroll 25 and the orbiting scroll 26 are in a state where the flow of refrigerant from the compression chamber 27 to the backpressure chamber 50 is permitted. Hereinafter, the state in which the fixed scroll 25 and the orbiting scroll 26 allow the flow of refrigerant from the compression chamber 27 to the backpressure chamber 50 is referred to as a supply state. That is,when the pressure in the back pressure chamber 50 is lower than that in the compression chamber 27, the supply mechanism D1 is in the supply state.

[0051] As described above, the supply mechanism D1 is capable of switching between the supply state in which the flow of refrigerant from the compression chamber 27 to the back pressure chamber 50 is permitted and the non-supply state in which the flow of refrigerant from the compression chamber 27 to the back pressure chamber 50 is blocked in the supply passage 51. Temporary outlet passage

[0052] As in Fig. 1 and Fig. As shown in Fig. 2, the scroll compressor 10 has a temporary discharge passage 60. The temporary discharge passage 60 is formed in the housing 11. The temporary discharge passage 60 is provided in the support member 13. A first end of the temporary discharge passage 60 opens at the support member end surface 13e. A through hole 30a extending through the elastic plate 30 in a thickness direction thereof is formed in a portion of the elastic plate 30 facing the first end of the temporary discharge passage 60. The first end of the temporary discharge passage 60 may be in a state where the temporary discharge passage 60 is in communication with the intake pressure region through the through hole 30a formed in the elastic plate 30, or in a state where the temporary discharge passage 60 is not in communication with the intake pressure region.The first end of the temporary exhaust passage 60 switches between the state in which the temporary exhaust passage 60 is in communication with the suction pressure region and the state in which the temporary exhaust passage 60 is not in communication with the suction pressure region with an orbital movement of the orbiting scroll 26.

[0053] A second end of the temporary discharge passage 60 opens at the inner peripheral surface of the flange wall 19. In other words, the second end of the temporary discharge passage 60 opens to the back pressure chamber 50. That is, the temporary discharge passage 60 is in communication with the back pressure chamber 50.

[0054] The first end of the temporary exhaust passage 60 faces the fixed scroll 25 in a state where the temporary exhaust passage 60 communicates with the intake pressure region. In this state, the temporary exhaust passage 60 communicates with the intake port 39 through a space defined by the fixed scroll 25, the orbiting scroll 26, and the elastic plate 30. When the first end of the temporary exhaust passage 60 communicates with the intake pressure region, the temporary exhaust passage 60 connects the intake pressure region to the backpressure chamber 50.

[0055] The first end of the temporary exhaust passage 60 faces the orbiting scroll 26 in a state where the temporary exhaust passage 60 is not in communication with the intake pressure region. In this state, the orbiting scroll 26 blocks the temporary exhaust passage 60 from the intake port 39. In other words, when the first end of the temporary exhaust passage 60 is not in communication with the intake pressure region, the temporary exhaust passage 60 is cut off from communication with the intake pressure region. In other words, when the first end of the temporary exhaust passage 60 is not in communication with the intake pressure region, the orbiting scroll 26 cuts off communication between the intake pressure region and the backpressure chamber 50.As described above, the temporary discharge passage 60 provides temporary communication between the back pressure chamber 50 and the suction pressure region with an orbital movement of the orbiting scroll 26. Outlet passage

[0056] As in Fig. 1, Fig. 2 and Fig. 3, the scroll compressor 10 has a discharge passage 70. The discharge passage 70 is formed in the housing 11. The discharge passage 70 has a first passage 71 formed in the support member 13 and a second passage 72 formed in the discharge housing 14. The discharge passage 70 is formed inside the support member 13 and the discharge housing 14 and connects the backpressure chamber 50 to the discharge port 45. In other words, the backpressure chamber 50 is connectable to the discharge pressure region through the discharge passage 70. Thus, the discharge passage 70 connects the backpressure chamber 50 to the discharge pressure region.

[0057] The first sealing member 401 is arranged between the first passage 71 and the second passage 72. A sealing member hole 401a is formed in a portion of the first sealing member 401 facing the first passage 71 and the second passage 72. The first passage 71 and the second passage 72 communicate with each other through the sealing member hole 401a. That is, the first sealing member 401 has the sealing member hole 401a, which provides communication between the first passage 71 and the second passage 72. First round

[0058] The first passage 71 has a radial passage 711 and an axial passage 712. Both the radial passage 711 and the axial passage 712 are formed inside the support component 13.

[0059] A first end of the radial passage 711 opens to the backpressure chamber 50. A second end of the radial passage 711 is positioned in a portion of the support member 13 that is not aligned with the fixed worm 25 in the axial direction of the rotating shaft 15. The radial passage 711 extends in the radial direction of the rotating shaft 15 from the first end to the second end thereof.

[0060] A first end of the axial passage 712 is connected to a portion of the radial passage 711 close to the second end thereof. That is, the first end of the axial passage 712 is positioned in a portion of the support member 13 that is not aligned with the fixed worm 25 in the axial direction of the rotating shaft 15. A second end of the axial passage 712 opens at the support member end surface 13e of the support member 13. The axial passage 712 extends in the axial direction of the rotating shaft 15 from the first end to the second end.

[0061] Accordingly, the first passage 71 opens to the backpressure chamber 50 at the first end of the radial passage 711 and opens at the support member end surface 13e of the support member 13 at the second end of the axial passage 712. The first end of the radial passage 711 and the second end of the axial passage 712 communicate with each other through an interior of the first passage 71. In other words, the backpressure chamber 50 opens at the support member end surface 13e of the support member 13 via the first passage 71. The first passage 71 is open to an outside of the support member 13 only at the first end of the radial passage 711 and the second end of the axial passage 712. For example, in the support member 13, the first passage 71 is not connected to a portion of the suction passage 35 defined by the support member 13. Second round

[0062] The second passage 72 extends in the axial direction of the rotary shaft 15 inside the discharge housing 14. A first end of the second passage 72 opens at the discharge housing end surface 14d of the discharge housing 14. A second end of the second passage 72 opens at a portion of a discharge housing peripheral wall 14b that defines the outlet port 45. In other words, the second end of the second passage 72 opens at a portion of the discharge housing peripheral wall 14b facing the discharge housing end wall 14a. That is, the second passage 72 is in communication with the outlet port 45. The second passage 72 extends through the discharge housing peripheral wall 14b in the axial direction of the rotary shaft 15. The second passage 72 opens to an outside of the discharge housing peripheral wall 14b of the discharge housing 14 only at the first end and the second end.For example, in the discharge housing 14, the second passage 72 is not connected to a portion of the suction passage 35 defined by the discharge housing 14. Valve accommodation chamber

[0063] As in Fig. 3 and Fig. 4, a valve accommodation chamber 73 is formed in the second passage 72. In other words, the valve accommodation chamber 73 is formed in the outlet passage 70. The valve accommodation chamber 73 extends in a direction in which the second passage 72 extends. In other words, the valve accommodation chamber 73 extends in the direction in which a refrigerant flows. A first end of the valve accommodation chamber 73 opens at the discharge housing end surface 14d. The first end of the valve accommodation chamber 73 and the first end of the second passage 72 coincide. The second end of the valve accommodation chamber 73 is positioned closer to the discharge housing end surface 14d than the second end of the second passage 72 in the axial direction of the rotary shaft 15. The second end of the valve accommodation chamber 73 is positioned inside the discharge housing peripheral wall 14b.

[0064] A diameter of the second passage 72 is increased at a portion where the second passage 72 becomes the valve accommodation chamber 73. In other words, the diameter of the second passage 72 decreases from the first end to the second end.

[0065] As in Fig. 2 and Fig. 3, the valve accommodation chamber 73 has a valve seat surface 73a as a first valve restricting surface and an open surface 73b as a second valve restricting surface. The valve seat surface 73a is a surface located at the first end of the valve accommodation chamber 73 in the direction in which the second passage 72 extends. The valve accommodation chamber 73 is closed at the first end by the first seal member 401. The first seal member 401 has the valve seat surface 73a at a portion closing the valve accommodation chamber 73. That is, the first seal member 401 has the valve seat surface 73a. The open surface 73b is a surface at the second end of the valve accommodation chamber 73 in the direction in which the second passage 72 extends and is a surface facing the valve seat surface 73a.The valve accommodation chamber 73 is defined by the valve seat surface 73a at the first end and the open surface 73b at the second end.

[0066] The valve seat surface 73a is opened through the seal member hole 401a as a restriction hole. In this embodiment, the seal member hole 401a serves as both the seal hole and the restriction hole. In other words, the valve accommodation chamber 73 communicates with the first passage 71 and the backpressure chamber 50 through the seal member hole 401a.

[0067] The open surface 73b is a surface formed inside the discharge housing peripheral wall 14b. Of the surfaces defining the valve accommodation chamber 73, the open surface 73b is a surface positioned closest to the discharge housing end wall 14a. The open surface 73b faces in a direction perpendicular to the axial direction of the rotary shaft 15.

[0068] An open hole 731 is formed in the open area 73b. A portion of the second passage 72 other than the valve housing chamber 73 communicates with the valve housing chamber 73 through the open hole 731. That is, the valve housing chamber 73 communicates with the discharge pressure region through the open hole 731.

[0069] Refrigerant can flow into the valve housing chamber 73 from the back pressure chamber 50 through the first passage 71 and the seal member hole 401a. Furthermore, refrigerant can flow into the valve housing chamber 73 from the outlet port 45 through the portion of the second passage 72 other than the valve housing chamber 73 and the open hole 731. Thus, the valve seat surface 73a has the seal member hole 401a through which refrigerant flows in from the back pressure chamber 50 via the outlet passage 70. Furthermore, the open surface 73b is provided with the open hole 731 through which refrigerant flows in from the discharge pressure region via the outlet passage 70.

[0070] The valve accommodation chamber 73 is surrounded by an accommodation chamber inner surface 73c in a direction perpendicular to the direction in which the valve accommodation chamber 73 extends. The valve accommodation chamber 73 is defined by the valve seat surface 73a, the open surface 73b, and the accommodation chamber inner surface 73c. outlet valve

[0071] The scroll compressor 10 has a discharge valve 80. The discharge valve 80 is arranged in the discharge passage 70. The discharge valve 80 is arranged in the second passage 72. The discharge valve 80 is housed in the valve housing chamber 73. In other words, the discharge valve 80 is housed in the second passage 72. The discharge valve 80 is reciprocally movable in the axial direction of the rotary shaft 15 in the valve housing chamber 73.

[0072] The exhaust valve 80 has a main body 81 and a restricting portion 82. The main body 81 has a columnar shape. The main body 81 has a first main body surface 81a and a second main body surface 81b in an axial direction of the main body 81. The first main body surface 81a and the second main body surface 81b extend perpendicular to the axial direction of the main body 81. The main body 81 has a main body outer surface 81c, which is a surface of outer surfaces of the main body 81 other than the first main body surface 81a and the second main body surface 81b. The main body outer surface 81c connects the first main body surface 81a to the second main body surface 81b. The diameter of the main body outer surface 81c is smaller than the passage diameter of the accommodation chamber inner surface 73c.

[0073] The restricting portion 82 is a portion that protrudes from the main body 81 in the axial direction of the main body 81. The restricting portion 82 is formed on the second main body surface 81b. The restricting portion 82 has a closing restricting surface 82a at an end of the restricting portion 82 that is not connected to the main body 81 in the axial direction of the main body 81. The closing restricting surface 82a is perpendicular to the axis of the main body 81. The closing restricting surface 82a faces the same direction as the second main body surface 81b. The cross-sectional area of ​​the restricting portion 82 is smaller than the cross-sectional area of ​​the main body 81, as viewed in the axial direction of the main body 81. In other words, the area of ​​the closing restricting surface 82a is smaller than the area of ​​each of the first main body surface 81a and the second main body surface 81b.

[0074] The restricting portion 82 is formed at a position of the second main body surface 81b that is offset from the axis of the main body 81. In other words, the restricting portion 82 is formed at a position that is eccentric to the axis of the main body 81.

[0075] The exhaust valve 80 is housed in the valve housing chamber 73 such that the axial direction of the main body 81 and the direction in which the second passage 72 extends coincide with each other. The exhaust valve 80 is housed in the valve housing chamber 73 such that the first main body surface 81a faces the first seal member 401 and the first closing restriction surface 82a faces the open surface 73b. That is, the exhaust valve 80 has the main body 81 facing the valve seat surface 73a and the restriction portion 82 facing the open surface 73b. In the direction in which the second passage 72 extends, the seal member hole 401a and the first main body surface 81a are aligned.In other words, the sealing member hole 401a is formed at a portion that overlaps with the first main body surface 81a when the first sealing member 401 is viewed from the direction in which the second passage 72 extends. The restricting portion 82 is disposed at a position on the first main body surface 81a that does not face the open hole 731. In other words, the restricting portion 82 and the open hole 731 are not aligned when viewed in the direction in which the second passage 72 extends.

[0076] The exhaust valve 80 is housed in the valve housing chamber 73 such that the main body outer surface 81c and the housing chamber inner surface 73c face each other with a gap (not shown) formed therebetween. The exhaust valve 80 is housed in the housing chamber 73 so as to be reciprocally movable within the valve housing chamber 73, while a portion of the main body outer surface 81c is in sliding contact with the housing chamber inner surface 73c. ​​In other words, the exhaust valve 80 is housed in the valve housing chamber 73 so as to be reciprocally movable between the valve seat surface 73a and the open surface 73b. Delivery status and non-delivery status

[0077] Fig. 4 illustrates a state of the exhaust valve 80 in which the restricting portion is pressed against the open surface 73b, and a state of the exhaust valve 80 in which the main body 81 is pressed against the valve seat surface 73a. In Fig. 4, the state of the exhaust valve 80 in which the restricting portion 82 is pressed against the open surface 73b is indicated by a double-dashed line. Fig. 4, the state of the exhaust valve 80 in which the main body 81 is pressed against the valve seat surface 73a is indicated by a solid line.

[0078] As indicated by the double-dashed lines in Fig. 3 and Fig. 4, when the pressure in the back pressure chamber 50 is higher than the pressure in the discharge pressure region, the discharge valve 80 in the valve accommodation chamber 73 is urged in a direction from the back pressure chamber 50 toward the discharge port 45. In this case, the discharge valve 80 presses the restricting portion 82 against the open surface 73b. When the discharge valve 80 is viewed from the direction in which the second passage 72 extends, the restricting portion 82 is at a position that does not overlap with the open hole 73b. Therefore, when the restricting portion 82 is in contact with the open surface 73b, the discharge valve 80 does not close the seal member hole 401a. That is, In the valve accommodation chamber 73, the open hole 731 and the sealing member hole 401a are communicated with each other through the gap between the main body outer surface 81c and the accommodation chamber inner surface 73c.In other words, the back pressure chamber 50 communicates with the discharge pressure region through the discharge passage 70. The discharge valve 80 is in a state where the flow of refrigerant from the back pressure chamber 50 to the discharge pressure region is permitted. Hereinafter, the state of the discharge valve 80 where the flow of refrigerant from the back pressure chamber 50 to the discharge pressure region is permitted is referred to as a discharge state S1. The discharge valve 80 is brought into the discharge state S1 when the pressure in the back pressure chamber 50 is higher than the pressure in the discharge pressure region. The discharge valve 80 is in the discharge state S1 when the first passage 71 and the second passage 72 are placed in communication with each other through the seal member hole 401a.

[0079] When the pressure in the back pressure chamber 50 is lower than the pressure in the discharge pressure region, the outlet valve 80 in the valve accommodation chamber 73 is urged in a direction from the outlet port 45 toward the back pressure chamber 50.

[0080] As shown by the continuous line in Fig. 4, the discharge valve 80 presses the main body 81 against the first seal member 401. The discharge valve 80 closes the seal member hole 401a when the main body 81 is in contact with the valve seat surface 73a. In other words, the seal member hole 401a of the first seal member 401 is closed by the first main body surface 81a. In the valve accommodation chamber 73, communication between the open hole 73a and the seal member hole 401a is blocked by the discharge valve 80. In other words, the back pressure chamber 50 is separated from the discharge pressure region in the discharge passage 70. In other words, the discharge valve 80 is in a state where the flow of refrigerant from the back pressure chamber 50 to the discharge pressure region is prevented.Hereinafter, the state of the discharge valve 80 in which the flow of refrigerant from the back pressure chamber 50 to the discharge pressure region is prevented is referred to as a non-discharge state S2. The discharge valve 80 is brought into the non-discharge state S2 by closing the sealing member hole 401a.

[0081] As described above, the discharge valve 80 switches between the discharge state S1 and the non-discharge state S2 depending on the pressure gradient between the backpressure chamber 50 and the discharge pressure region. Accordingly, the discharge valve 80 is configured to switch between the discharge state S1, in which the flow of refrigerant from the backpressure chamber 50 to the discharge pressure region is permitted, and the non-discharge state S2, in which the flow of refrigerant from the backpressure chamber 50 to the discharge pressure region is prohibited. Operation of the embodiment

[0082] The following describes the operation of the present embodiment.

[0083] The scroll compressor 10 compresses a refrigerant drawn into the suction pressure region in the compression chamber 27 through the fixed scroll 25 and the orbiting scroll 26. The scroll compressor 10 allows the refrigerant compressed in the compression chamber 27 to be discharged to the discharge chamber 41. The scroll compressor 10 supplies the refrigerant discharged to the discharge chamber 41 to the external refrigerant circuit connected to the scroll compressor 10. That is, a refrigerant discharged from the compression chamber 27 passes through the discharge pressure region and is supplied to the external refrigerant circuit.

[0084] When the scroll compressor 10 is in operation, a refrigerant in the back pressure chamber 50 is temporarily discharged through the temporary discharge passage 60 to the suction pressure region.

[0085] In the scroll compressor 10, when the pressure in the backpressure chamber 50 is reduced, the pressure for urging the orbiting scroll 26 toward the fixed scroll 25 is reduced, causing the distal end of the orbiting scroll spiral wall 26b to separate from the fixed scroll base plate 25a. That is, the supply mechanism D1 is placed in the supply state. Furthermore, when the pressure in the backpressure chamber 50 is reduced, the discharge valve 80 in the discharge passage 70 is placed in the non-discharge state S2. That is, a portion of the refrigerant compressed in the compression chamber 27 is supplied to the backpressure chamber 50 through the supply passage 51, while outflow of refrigerant from the discharge passage 70 is prevented by the discharge valve 80. As a result, the pressure in the backpressure chamber 50 increases.

[0086] Next, a situation will be described where the operation of the scroll compressor 10 is stopped. When performing suction of the interior of the stopped scroll compressor 10 with the scroll compressor 10 stopped and the temporary discharge passage 60 not communicating with the suction pressure region, the pressure in the backpressure chamber 50 is higher than the pressures in the discharge pressure region and the suction pressure region. Therefore, the supply mechanism D1 is in the non-supply state.

[0087] In a state where the scroll compressor 10 is stopped, with the temporary discharge passage 60 not communicating with the intake pressure region, the discharge valve 80 is in the discharge state S1. In other words, the backpressure chamber 50 communicates with the outside of the housing 11 through the discharge passage 70. Beneficial effects

[0088] The following describes effects of the present embodiment.(1) The scroll compressor 10 prevents the flow of refrigerant from the backpressure chamber 50 to the discharge pressure region in the discharge passage 70 during its operation, thereby preventing mixing of refrigerant flowing from the backpressure chamber 50 with the refrigerant in the discharge pressure region. Furthermore, when the operation of the scroll compressor 10 is stopped and the supply passage 51 is in the non-supply state, refrigerant in the backpressure chamber 50 is discharged through the temporary discharge passage 60 or the discharge passage 70. In other words, the scroll compressor 10 can discharge refrigerant in the backpressure chamber 50 through the temporary discharge passage 60 or the discharge passage 70 from the backpressure chamber 50 regardless of the position of the orbiting scroll 26 when the scroll compressor 10 is stopped.Accordingly, when the scroll compressor 10 is at a stop, a refrigerant can be discharged from the back pressure chamber 50 regardless of the position of the orbiting scroll 26.

[0089] For example, purge is performed in the scroll compressor 10 during a stop. If refrigerant in the backpressure chamber 50 of the scroll compressor 10 has not been discharged after the scroll compressor 10 is stopped, purge is not performed sufficiently. The scroll compressor 10 has the discharge passage 70, which allows for sufficient purge. (2) The first sealing member 401 functions as the valve seat on which the exhaust valve 80 is seated in the valve accommodation chamber 73. As a result, the first sealing member 401 can also be used as the sealing member for blocking communication between the first passage 71 and the second passage 72, so that a separate sealing member does not need to be provided. (3) The flow of refrigerant between the backpressure chamber 50 and the discharge pressure region is controlled by the reciprocating movement of the discharge valve 80 in the valve housing chamber 73. For example, compared with a case where a ball valve or the like is used as the discharge valve 80, the flow of refrigerant between the backpressure chamber 50 and the discharge pressure region can be controlled with a simpler configuration. Therefore, the scroll compressor 10 can control the flow of refrigerant in the discharge passage 70 with a simple configuration. modification

[0090] The above embodiment may be modified as described below. The above embodiment and the following modifications may be combined within a technically consistent range.

[0091] The exhaust valve 80 does not necessarily have to have the main body 81 and the restricting portion 82. For example, the exhaust valve 80 may be a reed valve or a ball valve.

[0092] The outlet passage 70 does not necessarily have to have the valve housing chamber 73. For example, the flow of refrigerant in the outlet passage 70 can be controlled by a check valve provided directly inside the outlet passage 70. In this case, for example, a butterfly valve can be used as the outlet valve 80.

[0093] The exhaust valve 80 need not be located in the second passage 72. The exhaust valve 80 may be located in the first passage 71.

[0094] As in Fig. As shown in Figure 5, the exhaust valve 80 may have a seat 83 as a sealing member. In this case, the first sealing member 401 does not need to be provided on the valve seat surface 73a. The seat 83 is located at a position aligned with the restriction portion 82 and the main body 81 in the axial direction of the main body 81. The seat 83 is made of resin. For example, the seat 83 is formed by machining the first main body surface 81a of the main body 81 with rubber. In this case, the exhaust valve 80 closes the second end of the axial passage 712 with the seat 83.

[0095] At this time, in the non-discharge state S2, communication between the first passage 71 and the second passage 72 is blocked by the seat 83 closing the second end of the axial passage 712. In other words, the exhaust valve 80 has the seat 83 at a portion placed in contact with the housing 11 and blocks the exhaust passage 70 in the non-discharge state S2. In other words, the exhaust valve 80 has the seat 83 at the portion not placed in contact with the housing 11 in the discharge state S1. In this case, the sealing member can be provided more easily compared to a case where the exhaust valve 80 does not have the seat 83.

[0096] Moreover, the exhaust valve 80 having the seat 83 allows disposing the exhaust valve 80 at a position other than where the exhaust valve 80 does not use the first sealing member 401 as the seat.

[0097] For example, in Fig. 6, the exhaust valve 80 may be provided in the first passage 71. In this case, the valve accommodation chamber 73 is formed in the first passage 71. In other words, the exhaust valve 80 having the seat 83 allows the first passage 71 and the second passage 72 to be precisely separated even if the first sealing member 401 is not used as the valve seat.

[0098] The first sealing member does not necessarily have to be provided between the first passage 71 and the second passage 72. In this case, a sealing member is preferably provided between the discharge housing 14 and the support member 13 in the scroll compressor 10.

[0099] The outlet passage 70 does not need to be formed in the discharge housing 14 and the support member 13. For example, the outlet passage 70 may be formed in the discharge housing 14, the support member 13, and the fixed scroll 25.

[0100] The supply mechanism D1 does not need to be formed of the orbiting scroll 26 and the fixed scroll 25. For example, the supply mechanism D1 may be formed of a check valve provided in the supply passage 51. In this case, the supply passage 51 does not need to be formed in the orbiting scroll 26. For example, the supply passage 51 may be formed in the fixed scroll 25 and the support member 13. In this case, the check valve in the supply passage 51 allows the flow of refrigerant from the compression chamber 27 to the backpressure chamber 50 while restricting the flow of refrigerant from the backpressure chamber 50 to the compression chamber 27.

[0101] A position where the second end of the second passage 72 opens is not limited to the position described in the above embodiment. For example, the second passage 72 may be connected to the discharge chamber 41 without passing through the outlet port 45. In short, it is only necessary that the second end of the second passage 72 opens at a position where the outlet passage 70 is connected to the discharge pressure region.

[0102] The discharge housing 14 may be formed of two components arranged side by side in the axial direction of the rotary shaft 15. In this case, a sealing member may be arranged between the support member 13 and a component of the discharge housing 14 adjacent to the support member 13, and a sealing hole may be provided in the sealing member. Furthermore, in the discharge housing formed of two components, a sealing member may be arranged between one component and the other component, and a sealing hole may be provided in the sealing member.

[0103] A scroll compressor (10) has a rotating shaft (15), a housing (11), a fixed scroll (25), an orbiting scroll (26), a suction pressure region, a compression chamber (27), a discharge pressure region, a back pressure chamber, a supply passage (51), a supply mechanism, and a temporary discharge passage (60). The housing (11) has a discharge passage (70) connecting the back pressure chamber (50) to the discharge pressure region. The discharge passage (70) has a discharge valve (80) configured to switch between a discharge state in which the flow of refrigerant from the back pressure chamber (50) to the discharge pressure region is permitted and a non-discharge state in which the flow of refrigerant from the back pressure chamber (50) to the discharge pressure region is prevented. The discharge valve (80) is brought into the discharge state when a pressure in the back pressure chamber (50) is higher than a pressure in the discharge pressure region. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2013-204457

[0004]

Claims

[1] Scroll compressor (10) with: a rotating shaft (15); a housing (11) having a support member (13) that supports the rotary shaft (50); a fixed screw (25) fixed to the housing (11); an orbiting worm (26) disposed between the support member (13) and the fixed worm (25) and configured to make an orbiting movement relative to the fixed worm (25) with rotation of the rotary shaft (15); a suction pressure region formed in the housing (11) into which a refrigerant is drawn; a compression chamber (27) defined by the orbiting scroll (26) and the fixed scroll (25) in which the refrigerant drawn into the suction pressure region is compressed; a discharge pressure region formed in the housing (11), the discharge pressure region having a discharge chamber (14) to which the refrigerant compressed in the compression chamber (27) is discharged; a back pressure chamber (50) defined between the orbiting scroll (26) and the support member (13) and into which the refrigerant is introduced to urge the orbiting scroll (26) toward the fixed scroll (25); a supply passage (51) through which a part of the refrigerant compressed in the compression chamber (27) is supplied to the back pressure chamber (50); a supply mechanism configured to switch between a supply state in which a flow of the refrigerant from the compression chamber (27) to the backpressure chamber (50) is permitted and a non-supply state in which the flow of the refrigerant from the compression chamber (27) to the backpressure chamber (50) is blocked, in the supply port (51); and a temporary outlet passage (60) arranged in the support member (13) and designed to temporarily provide communication between the back pressure chamber (50) and the suction pressure region with the orbiting movement of the orbiting scroll (26), characterized by , that the housing (11) has an outlet passage (70) connecting the backpressure chamber (50) to the discharge pressure region, the outlet passage (70) has an outlet valve (80) designed to switch between a discharge state in which the flow of the refrigerant from the back pressure chamber (50) to the discharge pressure region is permitted and a non-discharge state in which the flow of the refrigerant from the back pressure chamber (50) to the discharge pressure region is prevented, and the outlet valve (80) is brought into the discharge state when a pressure in the back pressure chamber (50) is higher than a pressure in the discharge pressure region. [2] Scroll compressor (10) according to claim 1, characterized by , that the housing (11) has a discharge housing (14) connected to the support member (13), and a sealing member is arranged between the support member (13) and the discharge housing (14), the outlet passage (70) has a first passage (71) formed in the support member (13) and a second passage (72) formed in the discharge housing (14), the sealing member has a sealing hole (401) providing communication between the first passage (71) and the second passage (72), and the outlet valve (80) is housed in the second passage (72), and the outlet valve (80) is brought into the non-discharge state by closing the seal hole (401) and is brought into the discharge state by opening the seal hole (401). [3] Scroll compressor (10) according to claim 1, characterized by in that the discharge valve (80) has a sealing member at a portion of the discharge valve (80), the portion being placed in contact with the housing (11) in the non-discharge state to close the discharge passage (70) and not being placed in contact with the housing (11) in the discharge state. [4] Scroll compressor (10) according to claim 1, characterized by , that a valve accommodation chamber (73) is formed in the outlet passage (70), the valve accommodation chamber (73) extends in a direction in which a refrigerant flows and has a first valve restriction surface (73a) and a second valve restriction surface (73b) facing the first valve restriction surface (73a) at a first end and a second end of the valve accommodation chamber (73), the valve accommodation chamber (73) being defined by the first valve restriction surface (73a) and the second valve restriction surface (73b), the first valve restriction surface (73a) has a restriction hole through which the refrigerant flows from the backpressure chamber (50) via the outlet passage (70) into the valve accommodation chamber (73), the second valve restriction surface (73b) has an open hole through which the refrigerant flows from the discharge pressure region via the outlet passage (70) into the valve accommodation chamber (73), the exhaust valve (80) is housed in the valve accommodation chamber (73) to be movable back and forth between the first valve restriction surface (73a) and the second valve restriction surface (73b), wherein the exhaust valve (80) has a main body (81) facing the first valve restriction surface (73a) and a restriction portion (82) facing the second valve restriction surface (73b), and the exhaust valve (80) closes the restriction hole in a state where the main body is in contact with the first valve restriction surface (73a), and does not close the restriction hole in a state where the restriction portion (82) is in contact with the second valve restriction surface (73b).

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