Scroll compressor

Abstract

To improve the reliability of scroll compressors. [Solution] The liquid refrigerant generated by the liquefaction of the refrigerant in the annular passage 54 is stored in the liquid refrigerant storage section 57 within the annular passage 54. At this time, the second intake hole 55 is formed in a part of the fixed peripheral wall 25c that is located vertically above the liquid refrigerant storage section 57. Therefore, it is suppressed that the liquid refrigerant generated in the annular passage 54 is drawn into the compression chamber 27 through the second intake hole 55. As a result, liquid compression in the compression chamber 27 is suppressed, and the pressure in the compression chamber 27 is suppressed from becoming abnormally high. Therefore, it is suppressed that the durability of the compression mechanism C1 does not deteriorate.

Description

Technical Field

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

Background Art

[0002] For example, as disclosed in Patent Document 1, a scroll compressor includes a rotating shaft, a compression mechanism, and a housing. The compression mechanism is driven by the rotation of the rotating shaft. The compression mechanism has a compression chamber for compressing a refrigerant. The housing has a suction chamber, a discharge chamber, and a suction passage. Refrigerant is sucked into the suction chamber from the outside. The refrigerant compressed in the compression chamber is discharged into the discharge chamber. The suction passage sucks the refrigerant in the suction chamber into the compression chamber.

[0003] The compression mechanism includes a fixed scroll and a orbiting scroll. The fixed scroll is fixed to the housing. The fixed scroll has a fixed substrate, a fixed spiral wall, and a fixed peripheral wall. The fixed spiral wall stands up from the fixed substrate. The fixed peripheral wall stands up from the fixed substrate and surrounds the fixed spiral wall. The orbiting scroll has an orbiting substrate and an orbiting spiral wall. The orbiting substrate faces the fixed substrate. The orbiting spiral wall stands up from the orbiting substrate toward the fixed substrate. The orbiting spiral wall meshes with the fixed spiral wall. And the compression chamber is defined by the fixed substrate, the fixed spiral wall, the orbiting substrate, and the orbiting spiral wall. The orbiting scroll revolves inside the fixed peripheral wall as the rotating shaft rotates.

[0004] The housing has a bearing housing and a discharge housing. The bearing housing is disposed on the side opposite to the fixed substrate with respect to the orbiting substrate. The bearing housing supports the rotating shaft. The discharge housing has a discharge housing end wall and a discharge housing peripheral wall. The discharge housing peripheral wall extends cylindrically from the discharge housing end wall. The discharge housing peripheral wall surrounds the fixed peripheral wall. And the discharge housing defines a discharge chamber between the discharge housing end wall and the fixed substrate.

[0005] The intake passage has a first intake port, an annular passage, and a second intake port. The first intake port is formed in the pivot housing. The first intake port communicates with the intake chamber. The annular passage is formed between the fixed peripheral wall and the discharge housing peripheral wall. The annular passage communicates with the first intake port. The second intake port is formed in the fixed peripheral wall. The second intake port communicates with the annular passage. The refrigerant in the intake chamber is then drawn into the compression chamber through the first intake port, the annular passage, and the second intake port. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2022-152796 [Overview of the project] [Problems that the invention aims to solve]

[0007] Incidentally, in such scroll compressors, the refrigerant in the annular passage may cool and liquefy when the compressor stops. When this liquid refrigerant is drawn into the compression chamber through the second intake port upon startup of the scroll compressor, liquid compression may occur in the compression chamber. When liquid compression occurs in the compression chamber in this way, there is a risk that the pressure in the compression chamber will become abnormally high. This will worsen the durability of the compression mechanism and reduce the reliability of the scroll compressor. [Means for solving the problem]

[0008] A scroll compressor that solves the above problems comprises a rotating shaft, a compression mechanism having a compression chamber driven by the rotation of the rotating shaft and for compressing a refrigerant, an intake chamber from which refrigerant is drawn in from the outside, a discharge chamber from which the refrigerant compressed in the compression chamber is discharged, and an intake passage for drawing refrigerant in the intake chamber into the compression chamber, and a housing that rotatably supports the rotating shaft, wherein the compression mechanism has a fixed base plate, a fixed spiral wall rising from the fixed base plate, and a fixed peripheral wall rising from the fixed base plate and surrounding the fixed spiral wall, and the housing The device comprises a fixed scroll fixed to the ring, a rotating substrate facing the fixed substrate, and a rotating scroll having a rotating spiral wall that stands upright from the rotating substrate toward the fixed substrate and engages with the fixed spiral wall, and which revolves inside the fixed peripheral wall as the rotation of the rotation axis rotates, the compression chamber being partitioned by the fixed substrate, the fixed spiral wall, the rotating substrate, and the rotating spiral wall, the housing being positioned on the opposite side of the fixed substrate from the rotating substrate and supporting the rotation axis, and a discharge housing end wall A scroll compressor having, and a discharge housing having a discharge housing circumferential wall that extends cylindrically from the end wall of the discharge housing and surrounds the fixed circumferential wall, and a discharge housing that partitions the discharge chamber between the end wall of the discharge housing and the fixed substrate, wherein the suction passage has a first suction hole formed in the pivot housing and communicating with the suction chamber, an annular passage formed between the fixed circumferential wall and the discharge housing circumferential wall and communicating with the first suction hole, and a second suction hole formed in the fixed circumferential wall and communicating with the annular passage, When viewed from the axial direction of the rotating shaft, a straight line passing vertically through the axis of the rotating shaft is defined as the first straight line, a straight line passing through the axis of the rotating shaft and extending at a 30-degree angle to one side in the circumferential direction of the rotating shaft relative to the first straight line is defined as the second straight line, a straight line passing through the axis of the rotating shaft and extending at a 30-degree angle to the other side in the circumferential direction of the rotating shaft relative to the first straight line is defined as the third straight line, and a portion of the inner circumferential surface of the discharge housing peripheral wall that demarcates the annular passage, located vertically below the axis of the rotating shaft, where it intersects with the second straight line is defined as the first intersection.If we define a second intersection as a portion of the inner circumferential surface of the discharge housing peripheral wall that demarcates the annular passage, located vertically below the axis of the rotation shaft, and a third straight line intersecting it, and a fourth straight line passing through the first and second intersections and extending horizontally, then when the annular passage is viewed from the axial direction of the rotation shaft, the region of the annular passage vertically below the fourth straight line is a liquid refrigerant storage portion that stores the liquid refrigerant while restricting the intake of the liquid refrigerant generated by the liquefaction of the refrigerant within the annular passage into the compression chamber via the second intake hole, and the second intake hole is formed in a portion of the fixed peripheral wall located vertically above the liquid refrigerant storage portion.

[0009] According to this design, the liquid refrigerant produced by the liquefaction of the refrigerant within the annular passage is stored in the liquid refrigerant storage section within the annular passage. At this time, the second intake port is formed in a location that is vertically above the liquid refrigerant storage section on the fixed peripheral wall. Therefore, it is possible to prevent the liquid refrigerant produced in the annular passage from being drawn into the compression chamber through the second intake port. Thus, it is possible to prevent liquid compression from occurring in the compression chamber, and therefore, it is possible to prevent the pressure in the compression chamber from becoming abnormally high. Consequently, it is possible to prevent deterioration of the durability of the compression mechanism. As a result, the reliability of the scroll compressor can be improved.

[0010] In the scroll compressor described above, a back pressure chamber is provided between the orbiting substrate and the support housing, through which a refrigerant is introduced to bias the orbiting scroll toward the stationary scroll. Preferably, the orbiting scroll has an air supply passage that supplies a portion of the refrigerant compressed in the compression chamber to the back pressure chamber.

[0011] Thus, even in a scroll compressor configuration where an air supply passage is formed in the orbiting scroll, the liquid refrigerant generated in the annular passage is prevented from being drawn into the compression chamber through the second intake port. Therefore, it is possible to prevent liquid refrigerant from flowing from the compression chamber into the back pressure chamber through the air supply passage. As a result, it is possible to avoid problems such as the back pressure chamber pressure rising too high due to the vaporization of the liquid refrigerant in the back pressure chamber.

[0012] In the scroll compressor described above, the second intake port is formed in the fixed peripheral wall above the axis of the rotation shaft in the vertical direction and located between the second straight line and the third straight line, and the opening formed between the fixed spiral wall and the winding end of the spiral spiral wall is preferably located above the axis of the rotation shaft in the vertical direction and located between the second straight line and the third straight line.

[0013] According to this, the refrigerant drawn in from the second intake port can easily flow into the opening formed between the fixed spiral wall and the end of the spiral spiral wall. Therefore, the refrigerant can be efficiently drawn into the compression chamber, thereby improving the compression efficiency of the scroll compressor.

[0014] In the scroll compressor described above, the first intake port is preferably formed in a location that is vertically above the liquid refrigerant storage portion in the shaft support housing. According to this, the flow of liquid refrigerant, which is generated when the refrigerant liquefies in the intake chamber, into the annular passage via the first intake port becomes more easily restricted. As a result, it becomes easier to further suppress the intake of liquid refrigerant into the compression chamber.

[0015] In the scroll compressor described above, the lower part of the intake chamber is an oil reservoir where oil contained in the refrigerant is stored, and it is preferable that an oil introduction passage is provided for introducing the oil stored in the oil reservoir into the inside of the fixed peripheral wall.

[0016] According to this design, the oil stored in the lower part of the oil reservoir can be introduced into the inside of the fixed peripheral wall through the oil introduction passage. Therefore, the lubrication between the fixed scroll and the orbiting scroll can be improved.

[0017] In the scroll compressor described above, the oil introduction passage preferably has a small-diameter hole formed in the shaft support housing that connects the oil reservoir and the annular passage, and an oil suction port formed in the fixed peripheral wall that connects the annular passage and the inside of the fixed peripheral wall.

[0018] The pressure difference between the pressure inside the annular passage and the pressure inside the fixed peripheral wall increases or decreases with the orbital motion of the orbiting scroll. When the pressure inside the fixed peripheral wall decreases, oil is supplied from the oil reservoir into the annular passage through the small-diameter holes, and the oil supplied into the annular passage is drawn in through the oil intake port and reaches the inside of the fixed peripheral wall. In this way, oil from the oil reservoir is intermittently introduced into the inside of the fixed peripheral wall through the oil introduction passage. On the other hand, even if liquid refrigerant accumulates at the bottom of the intake chamber, for example, the inflow of liquid refrigerant into the inside of the fixed peripheral wall through the oil introduction passage will be intermittent. Therefore, even if a scroll compressor is equipped with an oil introduction passage, it is possible to suppress the inflow of liquid refrigerant into the compression chamber. Thus, it is possible to maintain good lubrication between the fixed scroll and the orbiting scroll while suppressing the occurrence of liquid compression in the compression chamber.

[0019] In the scroll compressor described above, if a fifth straight line is defined as a straight line that passes through the axis of the rotating shaft and extends horizontally when viewed from the axial direction of the rotating shaft, then when the annular passage is viewed from the axial direction of the rotating shaft, the region of the annular passage below the fifth straight line in the vertical direction is preferably the liquid refrigerant storage section.

[0020] According to this, it is possible to make it easier to further store the liquid refrigerant generated by the liquefaction of the refrigerant in the annular passage in the liquid refrigerant storage portion in the annular passage. Therefore, it is possible to further easily suppress the liquid refrigerant generated in the annular passage from being sucked into the compression chamber through the second suction hole. Thus, it is possible to further easily suppress the occurrence of liquid compression in the compression chamber.

[0021] In the scroll compressor, a portion located above the axis of the rotating shaft in the vertical direction on the inner peripheral surface of the discharge housing peripheral wall partitioning the annular passage, and the intersection with the second straight line is defined as the third intersection point, and a portion located above the axis of the rotating shaft in the vertical direction on the inner peripheral surface of the discharge housing peripheral wall partitioning the annular passage, and the intersection with the third straight line is defined as the fourth intersection point. When a straight line passing through the third intersection point and the fourth intersection point and extending in the horizontal direction is defined as the sixth straight line, when the annular passage is viewed from the axial direction of the rotating shaft, the region below the sixth straight line in the vertical direction in the annular passage may be the liquid refrigerant storage portion.

[0022] According to this, it is possible to make it easier to further store the liquid refrigerant generated by the liquefaction of the refrigerant in the annular passage in the liquid refrigerant storage portion in the annular passage. Therefore, it is possible to further easily suppress the liquid refrigerant generated in the annular passage from being sucked into the compression chamber through the second suction hole. Thus, it is possible to further easily suppress the occurrence of liquid compression in the compression chamber.

Effect of the Invention

[0023] According to this invention, the reliability of the scroll compressor can be improved.

Brief Description of the Drawings

[0024] [Figure 1] FIG. 1 is a cross-sectional view of a scroll compressor in an embodiment. [Figure 2] FIG. 2 is a cross-sectional view of a scroll compressor. [Modes for carrying out the invention]

[0025] An embodiment of the scroll compressor will be described below with reference to Figures 1 and 2. The scroll compressor of this embodiment is used, for example, in a vehicle air conditioning system. <Basic configuration of a scroll compressor> As shown in Figure 1, the scroll compressor 10 is equipped with a cylindrical housing 11. The housing 11 includes a motor housing 12, a support housing 13, and a discharge housing 14. The motor housing 12, the support housing 13, and the discharge housing 14 are made of metal. For example, the motor housing 12, the support housing 13, and the discharge housing 14 are made of aluminum. The scroll compressor 10 also includes a rotating shaft 15. The rotating shaft 15 is housed within the housing 11.

[0026] The motor housing 12 has a plate-shaped motor housing end wall 12a and a cylindrical motor housing circumferential wall 12b. The motor housing circumferential wall 12b extends cylindrically from the outer circumference of the motor housing end wall 12a. The axial direction of the motor housing circumferential wall 12b coincides with the axial direction of the rotation axis 15.

[0027] The motor housing 12 has an intake port 12h. The intake port 12h draws in refrigerant from the outside. The intake port 12h is formed in the portion of the motor housing peripheral wall 12b located on the motor housing end wall 12a side. The intake port 12h connects the inside and outside of the motor housing 12.

[0028] The motor housing 12 has a cylindrical boss portion 12d. The boss portion 12d protrudes from the center of the inner surface of the motor housing end wall 12a. The first end, which is one end of the rotating shaft 15 in the axial direction, is inserted into the boss portion 12d.

[0029] The scroll compressor 10 is equipped with a bearing 16. The bearing 16 is, for example, a rolling bearing. The bearing 16 is provided between the inner circumferential surface of the boss portion 12d and the outer circumferential surface of the first end of the rotating shaft 15. The first end of the rotating shaft 15 is rotatably supported by the motor housing 12 via the bearing 16.

[0030] The pivot housing 13 has a plate-shaped pivot housing end wall 17 and a cylindrical pivot housing circumferential wall 18. The pivot housing circumferential wall 18 extends cylindrically from the outer circumference of the pivot housing end wall 17. The axial direction of the pivot housing circumferential wall 18 coincides with the axial direction of the rotation axis 15.

[0031] The pivot housing 13 has an annular flange wall 19. The flange wall 19 extends radially outward from the pivot housing end wall 17 on the outer circumferential surface of the pivot housing circumferential wall 18.

[0032] The pivot housing 13 has a circular through-hole 17a. The through-hole 17a is formed in the center of the pivot housing end wall 17. The through-hole 17a penetrates the pivot housing end wall 17 in the thickness direction of the pivot housing end wall 17. The rotating shaft 15 is inserted through the through-hole 17a. The end face 15e, which is the other axial end of the rotating shaft 15, is located on the inside of the pivot housing peripheral wall 18.

[0033] The scroll compressor 10 is equipped with a bearing 21. The bearing 21 is, for example, a rolling bearing. The bearing 21 is provided between the inner surface of the circumferential wall 18 of the support housing and the outer surface of the rotating shaft 15. The rotating shaft 15 is rotatably supported by the support housing 13 via the bearing 21. Therefore, the support housing 13 rotatably supports the rotating shaft 15. In this way, the housing 11 rotatably supports the rotating shaft 15.

[0034] The scroll compressor 10 is equipped with a motor chamber 20. The motor chamber 20 is partitioned by the motor housing 12 and the shaft support housing 13. Specifically, the motor chamber 20 is partitioned by the opening in the motor housing peripheral wall 12b being closed by the shaft support housing 13. Therefore, the motor housing 12 partitions the motor chamber 20 together with the shaft support housing 13 by the opening in the motor housing peripheral wall 12b being closed by the shaft support housing 13. In this way, the housing 11 has the motor chamber 20. The motor chamber 20 is in communication with the intake port 12h. Refrigerant is drawn into the motor chamber 20 from the intake port 12h. Therefore, the motor chamber 20 is an intake chamber into which refrigerant is drawn in from the outside.

[0035] The scroll compressor 10 includes a motor 22. The motor 22 is housed in a motor chamber 20. Therefore, the motor chamber 20 houses the motor 22. The motor 22 includes a cylindrical stator 23 and a cylindrical rotor 24. The rotor 24 is located inside the stator 23. The rotor 24 rotates integrally 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) provided on the rotor core 24a.

[0036] The stator 23 has a cylindrical stator core 23a and a motor coil 23b. The stator core 23a is fixed to the inner surface of the motor housing peripheral wall 12b of the motor housing 12. The motor coil 23b is wound around the stator core 23a. Power controlled by an inverter (not shown) is supplied to the motor coil 23b, causing the rotor 24 to rotate. As a result, the rotating shaft 15 rotates integrally with the rotor 24. Therefore, the motor 22 rotates the rotating shaft 15.

[0037] The scroll compressor 10 is equipped with a compression mechanism C1. The compression mechanism C1 comprises a fixed scroll 25 and an orbiting scroll 26. The compression mechanism C1 is of the scroll type. The compression mechanism C1 is driven by the rotation of the rotating shaft 15.

[0038] The fixed scroll 25 has a fixed substrate 25a, a fixed spiral wall 25b, and a fixed peripheral wall 25c. The fixed substrate 25a is disc-shaped. An ejection port 25h is formed in the center of the fixed substrate 25a. The ejection port 25h is a circular hole. The ejection port 25h penetrates the fixed substrate 25a in the thickness direction of the fixed substrate 25a. The fixed spiral wall 25b rises from the fixed substrate 25a. The fixed peripheral wall 25c rises from the outer periphery of the fixed substrate 25a. The fixed peripheral wall 25c surrounds the fixed spiral wall 25b.

[0039] The scroll compressor 10 is equipped with a valve mechanism 25v. The valve mechanism 25v is mounted on the end face of the fixed substrate 25a opposite to the fixed spiral wall 25b. The valve mechanism 25v is configured to open and close the discharge port 25h.

[0040] The orbiting scroll 26 has an orbiting base plate 26a and an orbiting spiral wall 26b. The orbiting base plate 26a is disc-shaped. The orbiting base plate 26a faces the fixed base plate 25a. The orbiting spiral wall 26b stands upright from the orbiting base plate 26a toward the fixed base plate 25a. The orbiting spiral wall 26b meshes with the fixed spiral wall 25b. The orbiting scroll 26 is located inside the fixed peripheral wall 25c. The orbiting scroll 26 revolves inside the fixed peripheral wall 25c as the rotation axis 15 rotates. The tip surface of the fixed spiral wall 25b is in contact with the orbiting base plate 26a. The tip surface of the orbiting spiral wall 26b is in contact with the fixed base plate 25a.

[0041] The scroll compressor 10 is equipped with a compression chamber 27. The compression chamber 27 is partitioned by a fixed base plate 25a, a fixed spiral wall 25b, a rotating base plate 26a, and a rotating spiral wall 26b. Therefore, the compression chamber 27 is partitioned between the fixed scroll 25 and the rotating scroll 26. The compression chamber 27 takes in refrigerant from the outside and compresses it. Thus, the compression mechanism C1 has a compression chamber 27.

[0042] The swivel base plate 26a has a cylindrical boss portion 26c. The boss portion 26c protrudes from the end face 26e of the swivel base plate 26a opposite to the fixed base plate 25a toward the inside of the pivot housing peripheral wall 18 of the pivot housing 13. The pivot housing 13 is positioned on the opposite side of the swivel base plate 26a from the fixed base plate 25a. The axial direction of the boss portion 26c coincides with the axial direction of the rotation axis 15. The swivel base plate 26a also has multiple groove portions 26d. The multiple groove portions 26d are each formed around the boss portion 26c on the end face 26e of the swivel base plate 26a. The multiple groove portions 26d are arranged at predetermined intervals in the circumferential direction of the rotation axis 15. Note that in Figure 1, for explanatory purposes, only one groove portion 26d is shown. An annular ring member 28 is fitted into each groove portion 26d. A pin 29 is inserted into each ring member 28. Each pin 29 protrudes from the end face 13e on the pivoting scroll 26 side of the pivot housing 13.

[0043] The scroll compressor 10 is equipped with an elastic plate 30. The elastic plate 30 is annular in shape. The outer circumference of the elastic plate 30 is sandwiched between the open end face of the fixed peripheral wall 25c and the end face 13e of the pivot housing 13. The elastic plate 30 constantly biases the orbiting scroll 26 toward the fixed scroll 25.

[0044] The scroll compressor 10 is equipped with an eccentric shaft 31. The eccentric shaft 31 protrudes toward the orbiting scroll 26 from a position eccentric with respect to the axis L1 of the rotating shaft 15 at the end face 15e of the rotating shaft 15. The eccentric shaft 31 is integrally formed with the rotating shaft 15. The axial direction of the eccentric shaft 31 coincides with the axial direction of the rotating shaft 15. The eccentric shaft 31 is inserted into the boss portion 26c.

[0045] The scroll compressor 10 includes a balance weight 32 and a bush 33. The bush 33 is fitted to the outer circumferential surface of the eccentric shaft 31. The balance weight 32 is integrated with the bush 33. The balance weight 32 is integrally formed with the bush 33. The balance weight 32 is housed within the circumferential wall 18 of the support housing. The orbiting scroll 26 is supported on the eccentric shaft 31 so as to be rotatable relative to the eccentric shaft 31 via the bush 33 and rolling bearings 34.

[0046] The rotation of the rotating shaft 15 is transmitted to the orbiting scroll 26 via the eccentric shaft 31, bushing 33, and rolling bearing 34. This causes the orbiting scroll 26 to rotate on its own axis. Then, the rotation of the orbiting scroll 26 is prevented by the contact between each pin 29 and the inner circumferential surface of each ring member 28, allowing only the orbital motion of the orbiting scroll 26 to be permitted. As a result, the orbiting scroll 26 revolves with the orbiting spiral wall 26b in contact with the fixed spiral wall 25b. As the orbiting scroll 26 revolves, the volume of the compression chamber 27 decreases, and the refrigerant is compressed in the compression chamber 27. The orbiting scroll 26 revolves inside the fixed circumferential wall 25c as the rotating shaft 15 rotates. The balance weight 32 counteracts the centrifugal force acting on the orbiting scroll 26 when it revolves. This reduces the amount of unbalance of the orbiting scroll 26.

[0047] The discharge housing 14 has a plate-shaped discharge housing end wall 14a and a cylindrical discharge housing peripheral wall 14b. The discharge housing peripheral wall 14b extends cylindrically from the outer circumference of the discharge housing end wall 14a. The axial direction of the discharge housing peripheral wall 14b coincides with the axial direction of the rotation axis 15. The discharge housing peripheral wall 14b surrounds the fixed peripheral wall 25c. Therefore, the discharge housing peripheral wall 14b surrounds the fixed scroll 25. In this way, the fixed scroll 25 is housed within the housing 11.

[0048] As shown in Figure 2, the discharge housing 14 has multiple bolt insertion holes 14c. Six bolt insertion holes 14c are formed in the discharge housing 14. Each bolt insertion hole 14c is formed to extend through the peripheral wall 14b of the discharge housing in the axial direction of the peripheral wall 14b of the discharge housing.

[0049] The bolts B1 passing through each bolt insertion hole 14c are screwed into the motor housing 12 by passing through the flange wall 19. As a result, as shown in Figure 1, the support housing 13 is connected to the motor housing circumferential wall 12b, and the discharge housing 14 is connected to the motor housing circumferential wall 12b via the flange wall 19 of the support housing 13. The motor housing 12, support housing 13, and discharge housing 14 are arranged in this order in the axial direction of the rotating shaft 15. The flange wall 19 of the support housing 13 is sandwiched between the discharge housing circumferential wall 14b and the motor housing circumferential wall 12b.

[0050] The fixed peripheral wall 25c of the fixed scroll 25 is sandwiched between the discharge housing end wall 14a and the pivot housing 13 in the axial direction of the discharge housing peripheral wall 14b by the axial force of each bolt B1. In this way, the fixed scroll 25 is fixed to the housing 11 by the fixed peripheral wall 25c being sandwiched between the discharge housing end wall 14a and the pivot housing 13 in the axial direction of the discharge housing peripheral wall 14b due to the axial force of the bolts B1.

[0051] The scroll compressor 10 is equipped with a discharge chamber 40. The discharge chamber 40 is partitioned between the discharge housing end wall 14a and the fixed base plate 25a. Thus, the discharge housing 14 partitions the discharge chamber 40 between the discharge housing end wall 14a and the fixed base plate 25a. Therefore, the housing 11 has a discharge chamber 40. The refrigerant compressed in the compression chamber 27 is discharged into the discharge chamber 40 through the discharge port 25h. The area between the discharge housing end wall 14a and the fixed base plate 25a of the discharge housing 14, and the area around the discharge chamber 40, is sealed by a gasket 41.

[0052] The discharge housing 14 has a discharge port 14h. The discharge port 14h is formed in the end wall 14a of the discharge housing. The discharge port 14h communicates with the discharge chamber 40. The discharge port 14h discharges the refrigerant from the discharge chamber 40 to the outside.

[0053] <Back pressure chamber> A back pressure chamber 45 is partitioned between the orbiting substrate 26a of the orbiting scroll 26 and the pivot housing 13. The back pressure chamber 45 is formed on the side opposite to the fixed substrate 25a relative to the orbiting substrate 26a within the housing 11. The pivot housing 13 separates the back pressure chamber 45 from the motor chamber 20. The inside of the pivot housing peripheral wall 18 is part of the back pressure chamber 45. Furthermore, the gap between the elastic plate 30 and the pivot housing 13 is also part of the back pressure chamber 45.

[0054] An air supply passage 46 is formed in the orbiting scroll 26. The first end of the air supply passage 46 opens at the tip of the orbiting spiral wall 26b. The first end of the air supply passage 46 is also able to communicate with the compression chamber 27. The second end of the air supply passage 46 communicates with the back pressure chamber 45. The air supply passage 46 penetrates the inner end of the orbiting spiral wall 26b that converges spirally toward the center of the orbiting scroll 26, and also penetrates the orbiting base plate 26a.

[0055] The air supply passage 46 then supplies a portion of the refrigerant compressed in the compression chamber 27 to the back pressure chamber 45. As a result, the pressure in the back pressure chamber 45 is higher than that in the motor chamber 20. This increased pressure in the back pressure chamber 45 biases the orbiting scroll 26 toward the fixed scroll 25 so that the tip of the orbiting vortex wall 26b is pressed against the fixed substrate 25a. In this way, refrigerant is introduced into the back pressure chamber 45 to bias the orbiting scroll 26 toward the fixed scroll 25.

[0056] <Suction passage> The housing 11 has an intake passage 50. The intake passage 50 draws refrigerant from the motor chamber 20 into the compression chamber 27. The intake passage 50 has an intake groove 51, a first intake port 52, an annular passage 54, and a second intake port 55.

[0057] Multiple intake grooves 51 are formed on the inner circumferential surface of the motor housing peripheral wall 12b of the motor housing 12. Each intake groove 51 is formed at the open end of the inner circumferential surface of the motor housing peripheral wall 12b. Each intake groove 51 opens at the open end of the motor housing peripheral wall 12b.

[0058] The first intake port 52 is formed on the outer circumference of the flange wall 19 of the pivot housing 13. Therefore, the first intake port 52 is formed in the pivot housing 13. The first intake port 52 penetrates the flange wall 19 in the thickness direction of the flange wall 19. The first intake port 52 communicates with one of the plurality of intake grooves 51. Therefore, the first intake port 52 communicates with the motor chamber 20 via the intake groove 51.

[0059] As shown in Figures 1 and 2, multiple communication grooves 53 are formed on the inner surface of the discharge housing peripheral wall 14b. As shown in Figure 2, one of the multiple communication grooves 53 communicates with the first intake port 52. An annular passage 54 is formed between the fixed peripheral wall 25c and the discharge housing peripheral wall 14b. The multiple communication grooves 53 together with the fixed peripheral wall 25c define the annular passage 54. The annular passage 54 communicates with the first intake port 52.

[0060] A second intake port 55 is formed in the fixed peripheral wall 25c. The second intake port 55 is formed in the fixed peripheral wall 25c so as to penetrate the fixed peripheral wall 25c in the thickness direction of the fixed peripheral wall 25c. The second intake port 55 communicates with the annular passage 54. The second intake port 55 communicates with the outermost part of the compression chamber 27. In this way, the intake passage 50 connects the motor chamber 20 and the compression chamber 27.

[0061] As shown in Figure 1, the refrigerant in the motor chamber 20 is drawn into the compression chamber 27 by passing through the intake groove 51, the first intake port 52, the annular passage 54, and the second intake port 55. The refrigerant drawn into the compression chamber 27 is compressed in the compression chamber 27 by the orbital motion of the orbiting scroll 26.

[0062] As shown in Figure 2, when viewed from the axial direction of the rotation axis 15, the straight line passing vertically through the axis L1 of the rotation axis 15 is defined as the first straight line L11. When viewed from the axial direction of the rotation axis 15, the straight line passing through the axis L1 of the rotation axis 15 and extending at a 30-degree angle relative to the first straight line L11 in one direction in the circumferential direction of the rotation axis 15 is defined as the second straight line L12. When viewed from the axial direction of the rotation axis 15, the straight line passing through the axis L1 of the rotation axis 15 and extending at a 30-degree angle relative to the first straight line L11 in the other direction in the circumferential direction of the rotation axis 15 is defined as the third straight line L13.

[0063] When viewed from the axial direction of the rotating shaft 15, the first intersection P1 is defined as the point on the inner surface of the discharge housing peripheral wall 14b that demarcates the annular passage 54 that is located vertically below the axis L1 of the rotating shaft 15 and intersects with the second straight line L12. When viewed from the axial direction of the rotating shaft 15, the second intersection P2 is defined as the point on the inner surface of the discharge housing peripheral wall 14b that demarcates the annular passage 54 that is located vertically below the axis L1 of the rotating shaft 15 and intersects with the third straight line L13. When viewed from the axial direction of the rotating shaft 15, the fourth straight line L14 is defined as the straight line that passes through the first intersection P1 and the second intersection P2 and extends horizontally.

[0064] When viewed from the axial direction of the rotating shaft 15, the straight line that passes through the axis L1 of the rotating shaft 15 and extends horizontally is defined as the fifth straight line L15. When viewed from the axial direction of the rotating shaft 15, the third intersection P3 is the point on the inner surface of the discharge housing peripheral wall 14b that demarcates the annular passage 54 that is located vertically above the axis L1 of the rotating shaft 15 and intersects with the second straight line L12. When viewed from the axial direction of the rotating shaft 15, the fourth intersection P4 is the point on the inner surface of the discharge housing peripheral wall 14b that demarcates the annular passage 54 that is located vertically above the axis L1 of the rotating shaft 15 and intersects with the third straight line L13. When viewed from the axial direction of the rotating shaft 15, the straight line that passes through the third intersection P3 and the fourth intersection P4 and extends horizontally is defined as the sixth straight line L16.

[0065] The first intake port 52 communicates with one of the multiple communication grooves 53, which is located vertically above the axis L1 of the rotation shaft 15 and between the second straight line L12 and the third straight line L13. The second intake port 55 is formed in the fixed peripheral wall 25c, which is located vertically above the axis L1 of the rotation shaft 15 and between the second straight line L12 and the third straight line L13.

[0066] <Frontage> The end of the spiral wall 26b opposite to the inner end that converges spirally toward the center of the spiral scroll 26 is the winding end 26f of the spiral wall 26b. The virtual circle C11 shown in Figure 2 virtually depicts the trajectory that the winding end 26f of the spiral wall 26b passes through as the spiral scroll 26 revolves. The virtual circle C11 is located vertically above the axis L1 of the rotation axis 15 and between the second line L12 and the third line L13. Therefore, the winding end 26f of the spiral wall 26b is located vertically above the axis L1 of the rotation axis 15 and between the second line L12 and the third line L13 as the spiral scroll 26 revolves. Furthermore, the opening 56 formed between the fixed spiral wall 25b and the winding end 26f of the rotating spiral wall 26b is located vertically above the axis L1 of the rotation axis 15, and is situated between the second straight line L12 and the third straight line L13.

[0067] <Liquid refrigerant storage section> The scroll compressor 10 is equipped with a liquid refrigerant storage section 57. The liquid refrigerant storage section 57 is located within the annular passage 54. The liquid refrigerant storage section 57 stores liquid refrigerant while restricting the intake of liquid refrigerant from the annular passage 54 to the compression chamber 27 via the second intake port 55, which is generated when the refrigerant liquefies within the annular passage 54. When the annular passage 54 is viewed from the axial direction of the rotation axis 15, the region of the annular passage 54 that is vertically below the sixth straight line L16 is the liquid refrigerant storage section 57. Therefore, when the annular passage 54 is viewed from the axial direction of the rotation axis 15, the region of the annular passage 54 that is vertically below the fifth straight line L15 is the liquid refrigerant storage section 57. Therefore, when the annular passage 54 is viewed from the axial direction of the rotation axis 15, the region of the annular passage 54 that is vertically below the fourth straight line L14 is the liquid refrigerant storage section 57.

[0068] The second intake port 55 is formed in a portion of the fixed peripheral wall 25c that is located vertically above the liquid refrigerant storage portion 57. The first intake port 52 is formed in a portion of the pivot housing 13 that is located vertically above the liquid refrigerant storage portion 57.

[0069] <Oil Inlet Passage> As shown in Figure 1, the lower part of the motor chamber 20 is an oil reservoir 58. Oil contained in the refrigerant is stored in the oil reservoir 58. The scroll compressor 10 is equipped with an oil introduction passage 59. As shown in Figures 1 and 2, the oil introduction passage 59 has a small diameter hole 60 and an oil suction port 61. The small diameter hole 60 is formed in the shaft support housing 13. The small diameter hole 60 connects the oil reservoir 58 and the annular passage 54.

[0070] As shown in Figure 2, the small-diameter hole 60 communicates with one of the multiple communication grooves 53, which is located vertically below the axis L1 of the rotation shaft 15 and between the second straight line L12 and the third straight line L13. When the annular passage 54 is viewed from the axial direction of the rotation shaft 15, the small-diameter hole 60 communicates with a region in the annular passage 54 that is vertically below the fourth straight line L14.

[0071] The oil intake port 61 is formed in the fixed peripheral wall 25c. Specifically, the oil intake port 61 is formed in a region of the fixed peripheral wall 25c that is vertically below the fourth straight line L14 when the fixed peripheral wall 25c is viewed from the axial direction of the rotation axis 15. The oil intake port 61 penetrates the fixed peripheral wall 25c in the radial direction of the rotation axis 15. The oil intake port 61 connects the annular passage 54 to the inside of the fixed peripheral wall 25c. The oil introduction passage 59 introduces the oil stored in the oil reservoir 58 into the inside of the fixed peripheral wall 25c.

[0072] [Effect of the Embodiment] Next, the operation of this embodiment will be described. Incidentally, in such a scroll-type compressor 10, when the scroll-type compressor 10 stops, the refrigerant in the annular passage 54 may cool and liquefy. The liquid refrigerant generated in the annular passage 54 is stored in the liquid refrigerant storage section 57 within the annular passage 54. At this time, the second intake port 55 is formed in a part of the fixed peripheral wall 25c that is located vertically above the liquid refrigerant storage section 57. This prevents the liquid refrigerant generated in the annular passage 54 from being drawn into the compression chamber 27 through the second intake port 55. Therefore, liquid compression in the compression chamber 27 is prevented. Furthermore, the flow of liquid refrigerant from the compression chamber 27 into the back pressure chamber 45 via the air supply passage 46 is avoided.

[0073] The pressure difference between the pressure inside the annular passage 54 and the pressure inside the fixed peripheral wall 25c increases or decreases with the orbital motion of the orbiting scroll 26. When the pressure inside the fixed peripheral wall 25c decreases, oil is supplied from the oil reservoir 58 into the annular passage 54 through the small-diameter hole 60, and the oil supplied into the annular passage 54 is drawn in through the oil intake port 61 and reaches the inside of the fixed peripheral wall 25c. In this way, oil from the oil reservoir 58 is intermittently introduced into the inside of the fixed peripheral wall 25c through the oil introduction passage 59. Therefore, good lubrication is achieved between the fixed scroll 25 and the orbiting scroll 26.

[0074] On the other hand, even if liquid refrigerant accumulates at the bottom of the motor chamber 20, the inflow of liquid refrigerant into the fixed peripheral wall 25c via the oil introduction passage 59 is intermittent. Therefore, even though the scroll compressor 10 is equipped with an oil introduction passage 59, the inhalation of liquid refrigerant into the compression chamber 27 is suppressed.

[0075] [Effects of the Embodiment] The above embodiment can be achieved to obtain the following effects. (1) The liquid refrigerant generated by the liquefaction of the refrigerant in the annular passage 54 is stored in the liquid refrigerant storage section 57 within the annular passage 54. At this time, the second intake port 55 is formed in a part of the fixed peripheral wall 25c that is located vertically above the liquid refrigerant storage section 57. Therefore, it is possible to prevent the liquid refrigerant generated in the annular passage 54 from being sucked into the compression chamber 27 through the second intake port 55. As a result, it is possible to prevent liquid compression from occurring in the compression chamber 27, and thus prevent the pressure in the compression chamber 27 from becoming abnormally high. Therefore, it is possible to prevent deterioration of the durability of the compression mechanism C1. As a result, the reliability of the scroll compressor 10 can be improved.

[0076] (2) Even if the scroll compressor 10 is configured such that an air supply passage 46 is formed in the orbiting scroll 26, the liquid refrigerant generated in the annular passage 54 is prevented from being drawn into the compression chamber 27 through the second intake port 55. Therefore, it is possible to prevent liquid refrigerant from flowing from the compression chamber 27 into the back pressure chamber 45 through the air supply passage 46. As a result, it is possible to avoid problems such as the pressure in the back pressure chamber 45 rising too high due to the vaporization of the liquid refrigerant in the back pressure chamber 45.

[0077] (3) The second intake port 55 is formed in the fixed peripheral wall 25c in a position vertically above the axis L1 of the rotation shaft 15 and between the second straight line L12 and the third straight line L13. The opening 56 formed between the fixed spiral wall 25b and the winding end 26f of the swirling spiral wall 26b is also vertically above the axis L1 of the rotation shaft 15 and between the second straight line L12 and the third straight line L13. This makes it easier for the refrigerant drawn in from the second intake port 55 to flow into the opening 56 formed between the fixed spiral wall 25b and the winding end 26f of the swirling spiral wall 26b. As a result, the refrigerant can be efficiently drawn into the compression chamber 27, thereby improving the compression efficiency of the scroll compressor 10.

[0078] (4) The first intake port 52 is formed in a part of the support housing 13 that is located vertically above the liquid refrigerant storage portion 57. This makes it easier to restrict the flow of liquid refrigerant, which is generated when the refrigerant liquefies in the motor chamber 20, to the annular passage 54 through the first intake port 52. As a result, it is possible to further suppress the intake of liquid refrigerant into the compression chamber 27.

[0079] (5) The lower part of the motor chamber 20 is an oil reservoir 58 in which oil contained in the refrigerant is stored. The scroll compressor 10 is equipped with an oil introduction passage 59 that introduces the oil stored in the oil reservoir 58 into the inside of the fixed peripheral wall 25c. This allows the oil stored in the lower part of the oil reservoir 58 to be introduced into the inside of the fixed peripheral wall 25c via the oil introduction passage 59. Therefore, the lubrication between the fixed scroll 25 and the orbiting scroll 26 can be improved.

[0080] (6) The pressure difference between the pressure inside the annular passage 54 and the pressure inside the fixed peripheral wall 25c increases or decreases with the orbital motion of the revolving scroll 26. When the pressure inside the fixed peripheral wall 25c decreases, oil is supplied from the oil reservoir 58 into the annular passage 54 via the small-diameter hole 60, and the oil supplied into the annular passage 54 is sucked in from the oil intake port 61 and reaches the inside of the fixed peripheral wall 25c. In this way, oil from the oil reservoir 58 is intermittently introduced into the inside of the fixed peripheral wall 25c via the oil introduction passage 59. On the other hand, even if liquid refrigerant is accumulated at the bottom of the motor chamber 20, for example, the inflow of liquid refrigerant into the inside of the fixed peripheral wall 25c via the oil introduction passage 59 will be intermittent. Therefore, even if the scroll compressor 10 is equipped with an oil introduction passage 59, it is possible to suppress the inhalation of liquid refrigerant into the compression chamber 27. Therefore, while suppressing liquid compression in the compression chamber 27, good lubrication between the fixed scroll 25 and the orbiting scroll 26 can be achieved.

[0081] (7) When the annular passage 54 is viewed from the axial direction of the rotation axis 15, the region in the annular passage 54 that is vertically below the fifth straight line L15 is the liquid refrigerant storage section 57. This makes it easier to further store the liquid refrigerant generated by the liquefaction of the refrigerant in the annular passage 54 in the liquid refrigerant storage section 57 within the annular passage 54. Therefore, it is easier to further suppress the liquid refrigerant generated in the annular passage 54 from being sucked into the compression chamber 27 through the second intake hole 55. Therefore, it is easier to further suppress the occurrence of liquid compression in the compression chamber 27.

[0082] (8) When the annular passage 54 is viewed from the axial direction of the rotation axis 15, the region in the annular passage 54 that is vertically below the sixth straight line L16 is the liquid refrigerant storage section 57. This makes it easier to further store the liquid refrigerant generated by the liquefaction of the refrigerant in the annular passage 54 in the liquid refrigerant storage section 57 within the annular passage 54. Therefore, it is easier to further suppress the liquid refrigerant generated in the annular passage 54 from being sucked into the compression chamber 27 through the second intake hole 55. Therefore, it is easier to further suppress the occurrence of liquid compression in the compression chamber 27.

[0083] [Example of changes] The above embodiment can be implemented with the following modifications. The above embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0084] ○ In this embodiment, the second suction hole 55 may be formed in a portion of the fixed peripheral wall 25c located between the fifth straight line L15 and the sixth straight line L16 when the fixed peripheral wall 25c is viewed from the axial direction of the rotation axis 15. In this case, the first suction hole 52 may be one of the plurality of communication grooves 53, located between the fifth straight line L15 and the sixth straight line L16, and communicating with the communication groove 53 corresponding to the second suction hole 55. Even in this case, when the annular passage 54 is viewed from the axial direction of the rotation axis 15, the region of the annular passage 54 that is vertically below the fifth straight line L15 is the liquid refrigerant storage portion 57.

[0085] ○ In this embodiment, the second suction hole 55 may be formed in a portion of the fixed peripheral wall 25c located between the fourth straight line L14 and the fifth straight line L15 when the fixed peripheral wall 25c is viewed from the axial direction of the rotation axis 15. In this case, the first suction hole 52 may be one of the plurality of communication grooves 53, located between the fourth straight line L14 and the fifth straight line L15, and communicating with the communication groove 53 corresponding to the second suction hole 55. Even in this case, when the annular passage 54 is viewed from the axial direction of the rotation axis 15, the region of the annular passage 54 that is vertically below the fourth straight line L14 is the liquid refrigerant storage portion 57. In short, the second suction hole 55 does not have to be formed in a portion of the fixed peripheral wall 25c that is vertically above the axis L1 of the rotation axis 15 and located between the second straight line L12 and the third straight line L13. Furthermore, the second intake port 55 should be formed in a portion of the fixed peripheral wall 25c that is vertically above the liquid refrigerant storage portion 57. When the annular passage 54 is viewed from the axial direction of the rotation axis 15, the region vertically below the fourth straight line L14 should be the liquid refrigerant storage portion 57.

[0086] ○ In this embodiment, the second intake hole 55 does not have to be formed in a location that is vertically above the axis L1 of the rotation axis 15 on the fixed peripheral wall 25c and located between the second straight line L12 and the third straight line L13. In this case, the opening 56 formed between the fixed spiral wall 25b and the winding end 26f of the swirling spiral wall 26b does not have to be vertically above the axis L1 of the rotation axis 15 and located between the second straight line L12 and the third straight line L13.

[0087] ○ In this embodiment, the first intake port 52 does not have to be formed in a location that is vertically above the liquid coolant storage portion 57 in the pivot housing 13. ○ In this embodiment, the oil introduction passage 59 does not have an oil suction port 61, and may be configured such that, for example, the first end of the small-diameter hole 60 communicates with the oil reservoir 58 and the second end of the small-diameter hole 60 communicates with the inside of the fixed peripheral wall 25c.

[0088] ○ In this embodiment, the scroll compressor 10 may be configured without an oil introduction passage 59. ○ In the embodiment, the number of the first intake holes 52 is not particularly limited.

[0089] ○ In the embodiment, the number of second intake holes 55 is not particularly limited. ○ In this embodiment, the scroll compressor 10 does not have to be driven by a motor 22, but may be driven by, for example, a vehicle engine.

[0090] ○ In this embodiment, the scroll compressor 10 was used in a vehicle air conditioning system, but it is not limited to this. In short, the scroll compressor 10 can be any compressor that compresses a refrigerant, and the application of the scroll compressor 10 can be changed as appropriate.

[0091] [Note] The technical concepts that can be understood from the above embodiments and modified examples are described below. <Note 1> The axis of rotation and A compression mechanism having a compression chamber that is driven by the rotation of the aforementioned rotating shaft and compresses the refrigerant, The device comprises an intake chamber from which refrigerant is drawn in from the outside, a discharge chamber from which the refrigerant compressed in the compression chamber is discharged, and a housing that has an intake passage for drawing refrigerant from the intake chamber into the compression chamber and rotatably supports the rotating shaft, The compression mechanism is A fixed scroll having a fixed substrate, a fixed spiral wall rising from the fixed substrate, and a fixed peripheral wall rising from the fixed substrate and surrounding the fixed spiral wall, and fixed to the housing, The system comprises a rotating substrate facing the fixed substrate, and a rotating scroll having a spiral wall that rises from the rotating substrate toward the fixed substrate and engages with the fixed spiral wall, and which revolves inside the fixed peripheral wall as the rotation of the rotation axis, The compression chamber is partitioned by the fixed substrate, the fixed spiral wall, the rotating substrate, and the rotating spiral wall. The aforementioned housing is A pivot housing is provided which is positioned on the opposite side of the fixed substrate from the rotating substrate and supports the rotating shaft, The discharge housing has a discharge housing end wall, and a discharge housing circumferential wall that extends cylindrically from the discharge housing end wall and surrounds the fixed circumferential wall, and the discharge housing has a discharge chamber partitioned between the discharge housing end wall and the fixed substrate, The aforementioned intake passage is A first intake port is formed in the pivot housing and communicates with the intake chamber, An annular passage is formed between the fixed peripheral wall and the discharge housing peripheral wall and communicates with the first intake port, A scroll compressor having a second intake port formed in the fixed peripheral wall and communicating with the annular passage, When viewed from the axial direction of the rotating shaft, a straight line passing vertically through the axis of the rotating shaft is defined as the first straight line, a straight line passing through the axis of the rotating shaft and extending at a 30-degree angle to one side of the circumferential direction of the rotating shaft relative to the first straight line is defined as the second straight line, a straight line passing through the axis of the rotating shaft and extending at a 30-degree angle to the other side of the circumferential direction of the rotating shaft relative to the first straight line is defined as the third straight line, a point on the inner surface of the discharge housing circumferential wall that demarcates the annular passage, located vertically below the axis of the rotating shaft, is defined as the first intersection, a point on the inner surface of the discharge housing circumferential wall that demarcates the annular passage, located vertically below the axis of the rotating shaft, is defined as the second intersection, a point on the inner surface of the discharge housing circumferential wall that demarcates the annular passage, is located vertically below the axis of the rotating shaft, is defined as the second intersection, and a straight line passing through the first and second intersections and extending horizontally is defined as the fourth straight line. When the annular passage is viewed from the axial direction of the rotation axis, the region of the annular passage below the fourth straight line in the vertical direction is a liquid refrigerant storage section that stores the liquid refrigerant while restricting the intake of the liquid refrigerant, which is produced when the refrigerant liquefies within the annular passage, from the annular passage to the compression chamber through the second intake hole. A scroll-type compressor characterized in that the second intake port is formed in a portion of the fixed peripheral wall located vertically above the liquid refrigerant storage portion.

[0092] <Note 2> Between the rotating substrate and the support housing, there is a back pressure chamber into which a refrigerant is introduced to bias the rotating scroll toward the stationary scroll. The scroll compressor according to <Note 1>, characterized in that the orbiting scroll has an air supply passage formed therein for supplying a portion of the refrigerant compressed in the compression chamber to the back pressure chamber.

[0093] <Note 3> The second intake port is formed in the fixed peripheral wall above the axis of rotation in the vertical direction and in a portion located between the second straight line and the third straight line. The scroll compressor according to Appendix 1 or Appendix 2, characterized in that the opening formed between the fixed spiral wall and the winding end of the rotating spiral wall is located vertically above the axis of the rotation shaft and between the second straight line and the third straight line.

[0094] <Note 4> The scroll compressor according to any one of <Appendix 1> to <Appendix 3>, characterized in that the first intake port is formed in a portion of the support housing located vertically above the liquid refrigerant storage portion.

[0095] <Note 5> The lower part of the intake chamber is an oil reservoir where oil contained in the refrigerant is stored. A scroll compressor according to any one of <Appendix 1> to <Appendix 4>, characterized in that it is provided with an oil introduction passage for introducing the oil stored in the oil reservoir into the inside of the fixed peripheral wall.

[0096] <Note 6> The aforementioned oil introduction passage is A small-diameter hole is formed in the pivot housing and connects the oil reservoir and the annular passage, The scroll compressor according to <Note 5>, characterized in that it has an oil intake port formed in the fixed peripheral wall and communicating the annular passage with the inside of the fixed peripheral wall.

[0097] <Note 7> When viewed from the axial direction of the rotation axis, if the fifth straight line is defined as a straight line that passes through the axis of the rotation axis and extends horizontally, A scroll compressor according to any one of <Appendix 1> to <Appendix 6>, characterized in that, when the annular passage is viewed from the axial direction of the rotation axis, the region in the annular passage that is vertically below the fifth straight line is the liquid refrigerant storage section.

[0098] <Note 8> If we define a third intersection as a portion of the inner surface of the discharge housing peripheral wall that defines the annular passage, located vertically above the axis of the rotation shaft, and intersecting it with the second straight line, and define a fourth intersection as a portion of the inner surface of the discharge housing peripheral wall that defines the annular passage, located vertically above the axis of the rotation shaft, and intersecting it with the third straight line, and define a sixth straight line as a straight line that passes through the third and fourth intersections and extends horizontally, The scroll compressor according to Appendix 7, characterized in that, when the annular passage is viewed from the axial direction of the rotation axis, the region in the annular passage that is vertically below the sixth straight line is the liquid refrigerant storage section. [Explanation of Symbols]

[0099] 10...Scroll compressor, 11...Housing, 13...Shaft support housing, 14...Discharge housing, 14a...Discharge housing end wall, 14b...Discharge housing peripheral wall, 15...Rotating shaft, 20...Motor chamber which is the intake chamber, 25...Fixed scroll, 25a...Fixed base plate, 25b...Fixed spiral wall, 25c...Fixed peripheral wall, 26...Orbiting scroll, 26a...Orbiting base plate, 26b...Orbiting spiral wall, 26f...End of winding, 27...Compression chamber, 40...Discharge chamber, 45...Back pressure chamber, 46 ...Air supply passage, 50...Intake passage, 52...First intake port, 54...Annular passage, 55...Second intake port, 56...Opening, 57...Liquid refrigerant storage section, 58...Oil storage section, 59...Oil introduction passage, 60...Small diameter hole, 61...Oil suction port, C1...Compression mechanism, L1...Axis, L11...First straight line, L12...Second straight line, L13...Third straight line, L14...Fourth straight line, L15...Fifth straight line, L16...Sixth straight line, P1...First intersection, P2...Second intersection, P3...Third intersection, P4...Fourth intersection.

Claims

1. The axis of rotation and A compression mechanism having a compression chamber that is driven by the rotation of the aforementioned rotating shaft and compresses the refrigerant, The device comprises an intake chamber from which refrigerant is drawn in from the outside, a discharge chamber from which the refrigerant compressed in the compression chamber is discharged, and a housing that has an intake passage for drawing refrigerant from the intake chamber into the compression chamber and rotatably supports the rotating shaft, The compression mechanism is A fixed scroll having a fixed substrate, a fixed spiral wall rising from the fixed substrate, and a fixed peripheral wall rising from the fixed substrate and surrounding the fixed spiral wall, and fixed to the housing, The system comprises a rotating substrate facing the fixed substrate, and a rotating scroll having a spiral wall that rises from the rotating substrate toward the fixed substrate and engages with the fixed spiral wall, and which revolves inside the fixed peripheral wall as the rotation of the rotation axis, The compression chamber is partitioned by the fixed substrate, the fixed spiral wall, the rotating substrate, and the rotating spiral wall. The aforementioned housing is A pivot housing is provided which is positioned on the opposite side of the fixed substrate from the rotating substrate and supports the rotating shaft, The discharge housing has a discharge housing end wall, and a discharge housing circumferential wall that extends cylindrically from the discharge housing end wall and surrounds the fixed circumferential wall, and the discharge housing has a discharge chamber partitioned between the discharge housing end wall and the fixed substrate, The aforementioned intake passage is A first intake port is formed in the pivot housing and communicates with the intake chamber, An annular passage formed between the fixed peripheral wall and the discharge housing peripheral wall and communicating with the first intake port, A scroll compressor having a second suction port formed in the fixed peripheral wall and communicating with the annular passage, When viewed from the axial direction of the rotating shaft, a straight line passing vertically through the axis of the rotating shaft is defined as the first straight line, a straight line passing through the axis of the rotating shaft and extending at a 30-degree angle to one side of the circumferential direction of the rotating shaft relative to the first straight line is defined as the second straight line, a straight line passing through the axis of the rotating shaft and extending at a 30-degree angle to the other side of the circumferential direction of the rotating shaft relative to the first straight line is defined as the third straight line, a point on the inner surface of the discharge housing peripheral wall that demarcates the annular passage, located vertically below the axis of the rotating shaft, is defined as the first intersection, a point on the inner surface of the discharge housing peripheral wall that demarcates the annular passage, located vertically below the axis of the rotating shaft, is defined as the second intersection, a point on the inner surface of the discharge housing peripheral wall that demarcates the annular passage, is located vertically below the axis of the rotating shaft, is defined as the second intersection, and a straight line passing through the first and second intersections and extending horizontally is defined as the fourth straight line. When the annular passage is viewed from the axial direction of the rotation axis, the region of the annular passage below the fourth straight line in the vertical direction is a liquid refrigerant storage section that stores the liquid refrigerant while restricting the intake of the liquid refrigerant, which is produced when the refrigerant liquefies within the annular passage, from the annular passage to the compression chamber through the second intake hole. A scroll-type compressor characterized in that the second intake port is formed in a portion of the fixed peripheral wall located vertically above the liquid refrigerant storage portion.

2. Between the rotating substrate and the support housing, there is a back pressure chamber into which a refrigerant is introduced to bias the rotating scroll toward the stationary scroll. The scroll compressor according to claim 1, characterized in that the orbiting scroll has an air supply passage formed therein for supplying a portion of the refrigerant compressed in the compression chamber to the back pressure chamber.

3. The second intake port is formed in the fixed peripheral wall above the axis of rotation in the vertical direction and in a portion located between the second straight line and the third straight line. The scroll compressor according to claim 1 or 2, characterized in that the opening formed between the fixed spiral wall and the winding end of the spiral spiral wall is located vertically above the axis of the rotation shaft and between the second straight line and the third straight line.

4. The scroll compressor according to claim 1 or 2, characterized in that the first intake port is formed in a portion of the support housing located vertically above the liquid refrigerant storage portion.

5. The lower part of the intake chamber is an oil reservoir where oil contained in the refrigerant is stored. The scroll compressor according to claim 1 or 2, further characterized by having an oil introduction passage for introducing the oil stored in the oil reservoir into the inside of the fixed peripheral wall.

6. The aforementioned oil introduction passage is A small-diameter hole is formed in the pivot housing and connects the oil reservoir and the annular passage, The scroll compressor according to claim 5, characterized in that it has an oil intake port formed in the fixed peripheral wall and communicating the annular passage with the inside of the fixed peripheral wall.

7. When viewed from the axial direction of the rotation axis, if the fifth straight line is defined as a straight line that passes through the axis of the rotation axis and extends horizontally, The scroll compressor according to claim 1, characterized in that, when the annular passage is viewed from the axial direction of the rotation axis, the region in the annular passage that is vertically below the fifth straight line is the liquid refrigerant storage section.

8. If we define a third intersection as a portion of the inner surface of the discharge housing perimeter wall that defines the annular passage, located vertically above the axis of the rotation shaft, and intersecting with the second straight line, and define a fourth intersection as a portion of the inner surface of the discharge housing perimeter wall that defines the annular passage, located vertically above the axis of the rotation shaft, and intersecting with the third straight line, and define a sixth straight line that passes through the third and fourth intersections and extends horizontally, The scroll compressor according to claim 7, characterized in that, when the annular passage is viewed from the axial direction of the rotation axis, the region in the annular passage that is vertically below the sixth straight line is the liquid refrigerant storage section.

Images