Scroll compressor

Abstract

The invention provides a scroll compressor with improved reliability. The discharge housing peripheral wall has an inner peripheral surface that defines the annular passage, and the inner peripheral surface has a lower portion that is located on the lower side in the vertical direction than the axis of the rotating shaft of the scroll compressor. When the annular passage is viewed from the axial direction of the rotating shaft, a region of the annular passage on the lower side in the vertical direction than the fourth straight line is a liquid refrigerant storage portion. The liquid refrigerant storage unit is configured so as to restrain the liquid refrigerant generated by liquefaction of the refrigerant in the annular passage from being sucked into the compression chamber from the annular passage through the second suction hole, and to store the liquid refrigerant. The second suction hole is formed in a position of the fixed peripheral wall, the position being located on the upper side of the liquid refrigerant storage part in the vertical direction.

Description

Technical Field

[0001] This disclosure relates to scroll compressors. Background Technology

[0002] For example, as disclosed in Japanese Patent Application Publication No. 2022-152796, 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 refrigerant. The housing has an intake chamber, a discharge chamber, and an intake passage. Refrigerant is drawn into the intake chamber from the outside. The refrigerant compressed in the compression chamber is discharged to the discharge chamber. The refrigerant in the intake chamber is drawn into the compression chamber through the intake passage.

[0003] The compression mechanism comprises a fixed scroll and a rotary scroll. The fixed scroll is fixed to the housing. The fixed scroll has a fixed base plate, a fixed scroll wall, and a fixed peripheral wall. The fixed scroll wall extends axially from the fixed base plate along the rotation axis. The fixed peripheral wall extends axially from the fixed base plate along the rotation axis and surrounds the fixed scroll wall. The rotary scroll has a rotary base plate and a rotary scroll wall. The rotary base plate is opposite to the fixed base plate. The rotary scroll wall extends from the rotary base plate toward the fixed base plate. The rotary scroll wall engages with the fixed scroll wall. The compression chamber is divided by the fixed base plate, the fixed scroll wall, the rotary base plate, and the rotary scroll wall. The rotary scroll revolves inside the fixed peripheral wall as the rotation axis rotates.

[0004] The housing has a shaft-supported housing member and a discharge housing member. The shaft-supported housing member is positioned opposite the fixed base plate to the rotating base plate. The shaft-supported housing member supports the rotating shaft. The discharge housing member has a discharge housing end wall and a discharge housing peripheral wall. The discharge housing peripheral wall is cylindrical and extends from the discharge housing end wall. The discharge housing peripheral wall surrounds the fixed peripheral wall. The discharge housing member divides the space between the discharge housing end wall and the fixed base plate into a discharge chamber.

[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 shaft support housing member. 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. Refrigerant in the intake chamber is drawn into the compression chamber through the first intake port, the annular passage, and the second intake port. Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In the scroll compressor disclosed in the aforementioned publication, when the scroll compressor stops, the refrigerant in the annular passage may sometimes be cooled and liquefied. If the liquid refrigerant generated from the refrigerant liquefaction in the annular passage is drawn into the compression chamber through the second suction port as the scroll compressor starts, liquid compression may sometimes occur in the compression chamber. If liquid compression occurs in the compression chamber, the pressure in the compression chamber may sometimes abnormally become high. In this case, the durability of the compression mechanism deteriorates, and therefore the reliability of the scroll compressor decreases.

[0008] Methods for solving problems

[0009] One aspect of this disclosure discloses a scroll compressor comprising: a rotating shaft; a compression mechanism configured to be driven by rotation of the rotating shaft and having a compression chamber configured to compress refrigerant; and a housing supporting the rotating shaft for rotatability and having an intake chamber for drawing in refrigerant from the outside, an exhaust chamber for discharging refrigerant compressed by the compression chamber, and an intake passage for refrigerant drawn from the intake chamber into the compression chamber. The compression mechanism comprises: a fixed scroll fixed to the housing and having a fixed base plate, a fixed scroll wall extending axially from the fixed base plate along the rotating shaft, and a fixed peripheral wall extending axially from the fixed base plate along the rotating shaft and surrounding the fixed scroll wall; and a rotating scroll configured to revolve within the fixed peripheral wall as the rotating shaft rotates, and having a rotating base plate opposite the fixed base plate and a rotating scroll wall extending from the rotating base plate toward the fixed base plate and engaging with the fixed scroll wall. The compression chamber is divided by the fixed base plate, the fixed scroll wall, the rotating base plate, and the rotating scroll wall. The housing has: a shaft support housing member disposed opposite to the fixed base plate relative to the rotating base plate and supporting the rotation shaft; and a discharge housing member having a discharge housing end wall and a cylindrical discharge housing peripheral wall extending from the discharge housing end wall and surrounding the fixed peripheral wall, dividing the discharge chamber between the discharge housing end wall and the fixed base plate. The suction passage has: a first suction hole formed in the shaft support housing member and communicating with the suction chamber; an annular passage formed between the fixed peripheral wall and the discharge housing peripheral wall and communicating with the first suction hole; and a second suction hole formed in the fixed peripheral wall and communicating with the annular passage. The discharge housing peripheral wall has an inner circumferential surface dividing the annular passage. The inner circumferential surface has a lower portion located vertically below the axis of the rotation shaft. When viewed from the axial direction of the rotation shaft, a straight line intersecting the axis of the rotation shaft and extending vertically is a first straight line. When viewed axially from the axis of rotation, the line that intersects the axis of rotation and extends at a 30-degree angle relative to the first line towards the circumferential direction of the axis of rotation is the second line. When viewed axially from the axis of rotation, the line that intersects the axis of rotation and extends at a 30-degree angle relative to the first line towards the other side of the axis of rotation is the third line. When viewed axially from the axis of rotation, the intersection point of the lower portion of the inner circumferential surface with the second line is the first intersection point. When viewed axially from the axis of rotation, the intersection point of the lower portion of the inner circumferential surface with the third line is the second intersection point. When viewed axially from the axis of rotation, the line that passes through the first and second intersection points and extends horizontally is the fourth line.When the annular passage is viewed axially from the rotation axis, the region in the annular passage that is lower in the vertical direction than the fourth straight line is a liquid refrigerant storage section. The liquid refrigerant storage section is configured to restrict the liquefaction of the refrigerant within the annular passage, thereby allowing liquid refrigerant to be drawn into the compression chamber via the second suction port and stored. The second suction port is formed on the fixed peripheral wall at a position higher in the vertical direction than the liquid refrigerant storage section. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of the scroll compressor in the implementation method.

[0011] Figure 2 yes Figure 1 A cross-sectional view of a scroll compressor from another direction. Detailed Implementation

[0012] The following is based on Figure 1 and Figure 2 One embodiment of a scroll compressor will be described. This scroll compressor is used, for example, in a vehicle air conditioning system.

[0013] <Basic Structure of a Scroll Compressor>

[0014] like Figure 1 As shown, the scroll compressor 10 includes a cylindrical housing 11. The housing 11 has a motor housing member 12, a shaft support housing member 13, and a discharge housing member 14. The motor housing member 12, shaft support housing member 13, and discharge housing member 14 are made of metal. For example, the motor housing member 12, shaft support housing member 13, and discharge housing member 14 are made of aluminum. The scroll compressor 10 includes a rotating shaft 15. The rotating shaft 15 is housed within the housing 11.

[0015] The motor housing component 12 has a plate-shaped motor housing end wall 12a and a cylindrical motor housing peripheral wall 12b. The cylindrical motor housing peripheral wall 12b extends from the outer periphery of the motor housing end wall 12a. The axial direction of the motor housing peripheral wall 12b is aligned with the axial direction of the rotation shaft 15.

[0016] The motor housing component 12 has a suction port 12h. Refrigerant is drawn in from the outside through the suction port 12h. The suction port 12h is formed in the portion of the peripheral wall 12b of the motor housing near the end wall 12a of the motor housing. The suction port 12h connects the inside and outside of the motor housing component 12.

[0017] The motor housing component 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 rotating shaft 15 has a first end portion as one end portion of its axial direction and a second end portion as the other end portion of its axial direction. The first end portion of the rotating shaft 15 is inserted into the boss portion 12d.

[0018] The scroll compressor 10 includes a bearing 16. The bearing 16 is, for example, a rolling bearing. The bearing 16 is disposed between the inner peripheral surface of the boss portion 12d and the outer peripheral surface of the first end of the rotating shaft 15. The first end of the rotating shaft 15 is rotatably supported on the motor housing member 12 via the bearing 16.

[0019] The shaft support housing component 13 has a plate-shaped shaft support housing end wall 17 and a cylindrical shaft support housing peripheral wall 18. The cylindrical shaft support housing peripheral wall 18 extends from the outer periphery of the shaft support housing end wall 17. The axial direction of the shaft support housing peripheral wall 18 is aligned with the axial direction of the rotating shaft 15.

[0020] The shaft support housing member 13 has an annular flange wall 19. The flange wall 19 extends radially outward from the end opposite to the shaft support housing end wall 17 on the outer peripheral surface of the shaft support housing peripheral wall 18 toward the rotating shaft 15.

[0021] The shaft support housing component 13 has a circular through hole 17a. The through hole 17a is formed in the central portion of the shaft support housing end wall 17. The through hole 17a penetrates the shaft support housing end wall 17 along its thickness direction. A rotating shaft 15 is inserted into the through hole 17a. The second end of the rotating shaft 15 has an end face 15e. The end face 15e is located inside the peripheral wall 18 of the shaft support housing.

[0022] The scroll compressor 10 includes a bearing 21. The bearing 21 is, for example, a rolling bearing. The bearing 21 is disposed between the inner circumferential surface of the shaft support housing peripheral wall 18 and the outer circumferential surface of the rotating shaft 15. The rotating shaft 15 is rotatably supported on the shaft support housing member 13 via the bearing 21. Therefore, the shaft support housing member 13 supports the rotating shaft 15 so that it can rotate. In this way, the housing 11 supports the rotating shaft 15 so that it can rotate.

[0023] The scroll compressor 10 includes a motor chamber 20. The motor chamber 20 is divided by a motor housing member 12 and a shaft support housing member 13. Specifically, the motor chamber 20 is divided by being closed by the shaft support housing member 13 through an opening in the peripheral wall 12b of the motor housing. Therefore, the motor housing member 12, through the opening in the peripheral wall 12b of the motor housing, is closed by the shaft support housing member 13, thus dividing the motor chamber 20 together with the shaft support housing member 13. In this way, the housing 11 has the motor chamber 20. The motor chamber 20 communicates with a suction inlet 12h. Refrigerant is drawn into the motor chamber 20 through the suction inlet 12h. Therefore, the motor chamber 20 is a suction chamber that draws refrigerant from the outside.

[0024] 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 disposed 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) disposed on the rotor core 24a.

[0025] The stator 23 has a cylindrical stator core 23a and a motor coil 23b. The stator core 23a is fixed to the inner circumferential surface of the motor housing peripheral wall 12b. 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, thereby rotating the rotor 24. As a result, the rotating shaft 15 rotates integrally with the rotor 24. Therefore, the motor 22 causes the rotating shaft 15 to rotate.

[0026] The scroll compressor 10 includes a compression mechanism C1. The compression mechanism C1 includes a fixed scroll 25 and a rotary scroll 26. The compression mechanism C1 is scroll type. The compression mechanism C1 is driven by the rotation of the rotating shaft 15.

[0027] The fixed scroll 25 has a fixed base plate 25a, a fixed scroll wall 25b, and a fixed peripheral wall 25c. The fixed base plate 25a is circular. A discharge port 25h is formed in the center of the fixed base plate 25a. The discharge port 25h is circular. The discharge port 25h passes through the fixed base plate 25a along its thickness direction. The fixed scroll wall 25b extends from the fixed base plate 25a along the axial direction of the rotation axis 15. The fixed peripheral wall 25c extends from the outer periphery of the fixed base plate 25a along the axial direction of the rotation axis 15. The fixed peripheral wall 25c surrounds the fixed scroll wall 25b.

[0028] The scroll compressor 10 includes a valve mechanism 25v. The valve mechanism 25v is mounted on the end face of the fixed base plate 25a opposite to the fixed scroll wall 25b. The valve mechanism 25v is configured to open and close the discharge port 25h.

[0029] The swirling scroll 26 has a swirling base plate 26a and a swirling scroll wall 26b. The swirling base plate 26a is circular. The swirling base plate 26a is opposite to the fixed base plate 25a. The swirling scroll wall 26b extends from the swirling base plate 26a toward the fixed base plate 25a. The swirling scroll wall 26b engages with the fixed scroll wall 25b. The swirling scroll 26 is located inside the fixed peripheral wall 25c. The swirling scroll 26 revolves inside the fixed peripheral wall 25c as the rotation shaft 15 rotates. The front end face of the fixed scroll wall 25b contacts the swirling base plate 26a.

[0030] The scroll compressor 10 includes a compression chamber 27. The compression chamber 27 is divided by a fixed base plate 25a, a fixed scroll wall 25b, a rotating base plate 26a, and a rotating scroll wall 26b. Therefore, the compression chamber 27 is formed by the division between the fixed scroll 25a and the rotating scroll 26b. Thus, the compression mechanism C1 has a compression chamber 27. The compression chamber 27 takes in refrigerant from the outside and compresses it.

[0031] The rotary base plate 26a has a cylindrical boss 26c. The boss 26c protrudes from the end face 26e of the rotary base plate 26a, opposite to the fixed base plate 25a, toward the inner side of the shaft support housing peripheral wall 18 of the shaft support housing member 13. The shaft support housing member 13 is disposed opposite to the rotary base plate 26a on the side opposite to the fixed base plate 25a. The axial direction of the boss 26c is aligned with the axial direction of the rotation shaft 15. The rotary base plate 26a has a plurality of grooves 26d. The plurality of grooves 26d are respectively formed around the boss 26c in the end face 26e of the rotary base plate 26a. The plurality of grooves 26d are arranged at predetermined intervals in the circumferential direction of the rotation shaft 15. Figure 1 For ease of explanation, only one groove 26d is shown in the diagram. A ring-shaped member 28 is embedded within each groove 26d. A pin 29 is inserted into each ring member 28. Each pin 29 protrudes from the end face 13e of the shaft support housing member 13 opposite to the vortex disk 26 and extends into the ring member 28.

[0032] The scroll compressor 10 includes an elastic plate 30. The elastic plate 30 is annular. The outer periphery of the elastic plate 30 is clamped between the open end face of the fixed peripheral wall 25c and the end face 13e of the shaft support housing member 13. The elastic plate 30 always exerts a force on the rotating scroll 26 toward the fixed scroll 25.

[0033] The scroll compressor 10 includes an eccentric shaft 31. The eccentric shaft 31 protrudes from the end face 15e of the rotating shaft 15 at an eccentric position relative to the axis L1 of the rotating shaft 15 toward the scroll plate 26. The eccentric shaft 31 is integrally formed with the rotating shaft 15. The axial direction of the eccentric shaft 31 is aligned with the axial direction of the rotating shaft 15. The eccentric shaft 31 is inserted into the boss portion 26c.

[0034] The scroll compressor 10 includes a counterweight 32 and a bushing 33. The bushing 33 is fitted into the outer peripheral surface of the eccentric shaft 31. The counterweight 32 and the bushing 33 are integrally formed. The counterweight 32 is housed in a space provided inside the peripheral wall 18 of the shaft support housing. The scroll 26 is supported on the eccentric shaft 31 by the bushing 33 and the rolling bearing 34 in a manner that allows it to rotate relative to the eccentric shaft 31.

[0035] The rotation of the rotating shaft 15 is transmitted to the rotary scroll 26 via the eccentric shaft 31, bushing 33, and rolling bearing 34. This causes the rotary scroll 26 to rotate. At this time, each pin 29 contacts the inner circumferential surface of the corresponding ring member 28, thereby preventing the rotary scroll 26 from rotating and allowing only its revolution. Thus, the rotary scroll 26 revolves while the rotary scroll wall 26b is in contact with the fixed scroll wall 25b. As the rotary scroll 26 revolves, the volume of the compression chamber 27 decreases, thereby compressing the refrigerant within the compression chamber 27. The rotary scroll 26 revolves inside the fixed circumferential wall 25c as the rotating shaft 15 rotates. The counterweight 32 counteracts the centrifugal force acting on the rotary scroll 26 during its revolution. This reduces the imbalance of the rotary scroll 26.

[0036] The discharge housing component 14 has a plate-shaped discharge housing end wall 14a and a cylindrical discharge housing peripheral wall 14b. The cylindrical discharge housing peripheral wall 14b extends from the outer periphery of the discharge housing end wall 14a. The axial direction of the discharge housing peripheral wall 14b is aligned with the axial direction of the rotation shaft 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.

[0037] like Figure 2 As shown, the discharge housing member 14 has a plurality of bolt insertion holes 14c. Six bolt insertion holes 14c are formed in the discharge housing member 14. Each bolt insertion hole 14c is formed to penetrate and extend through the discharge housing peripheral wall 14b axially.

[0038] Bolt B1, inserted into each bolt insertion hole 14c, passes through the flange wall 19 and engages with the motor housing component 12. Thus, as... Figure 1 As shown, the shaft support housing member 13 is connected to the motor housing peripheral wall 12b, and the discharge housing member 14 is connected to the motor housing peripheral wall 12b via the flange wall 19 of the shaft support housing member 13. The motor housing member 12, the shaft support housing member 13, and the discharge housing member 14 are arranged sequentially along the axial direction of the rotation shaft 15. The flange wall 19 of the shaft support housing member 13 is sandwiched between the discharge housing peripheral wall 14b and the motor housing peripheral wall 12b.

[0039] The fixed peripheral wall 25c of the fixed scroll 25 is clamped between the discharge housing end wall 14a and the shaft support housing member 13 in the axial direction of the discharge housing peripheral wall 14b by the axial force of each bolt B1. In this way, by means of the axial force of the bolt B1, the fixed peripheral wall 25c is clamped between the discharge housing end wall 14a and the shaft support housing member 13 in the axial direction of the discharge housing peripheral wall 14b, thereby fixing the scroll 25 to the housing 11.

[0040] The scroll compressor 10 includes a discharge chamber 40. The discharge chamber 40 is divided between the discharge housing end wall 14a and the fixed base plate 25a. Thus, the discharge housing member 14 divides 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 by the compression chamber 27 is discharged into the discharge chamber 40 through the discharge port 25h. The portion of the discharge housing member 14 between the discharge housing end wall 14a and the fixed base plate 25a and around the discharge chamber 40 is sealed by a gasket 41.

[0041] The discharge housing component 14 has a discharge port 14h. The discharge port 14h is formed in the discharge housing end wall 14a. The discharge port 14h communicates with the discharge chamber 40. The refrigerant in the discharge chamber 40 is discharged to the outside through the discharge port 14h.

[0042] <Back pressure chamber>

[0043] A back pressure chamber 45 is defined between the rotating base plate 26a of the rotating scroll 26 and the shaft support housing member 13. The back pressure chamber 45 is formed within the housing 11 on the side opposite to the fixed base plate 25a relative to the rotating base plate 26a. The shaft support housing member 13 separates the back pressure chamber 45 from the motor chamber 20. The inner side of the shaft support housing peripheral wall 18 is part of the back pressure chamber 45. The gap between the elastic plate 30 and the shaft support housing member 13 is part of the back pressure chamber 45.

[0044] An air supply passage 46 is formed in the swirling scroll 26. The first end of the air supply passage 46 opens at the front end of the swirling scroll wall 26b. The first end of the air supply passage 46 can 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 passes through the inner end of the swirling scroll wall 26b that converges in a swirling shape towards the center of the swirling scroll 26 and the swirling base plate 26a.

[0045] A portion of the refrigerant compressed by the compression chamber 27 is supplied to the back pressure chamber 45 via the gas supply passage 46. 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 forces the rotating scroll 26 towards the fixed scroll 25, pressing the leading edge of the rotating scroll wall 26b against the fixed base plate 25a. Thus, the refrigerant used to force the rotating scroll 26 towards the fixed scroll 25 is introduced into the back pressure chamber 45.

[0046] <Inhalation route>

[0047] The housing 11 has a suction passage 50. Refrigerant in the motor chamber 20 is drawn into the compression chamber 27 through the suction passage 50. The suction passage 50 has a suction groove 51, a first suction port 52, an annular passage 54, and a second suction port 55.

[0048] Multiple suction grooves 51 are formed on the inner circumferential surface of the motor housing peripheral wall 12b of the motor housing member 12. Each suction groove 51 is formed at the open end of the inner circumferential surface of the motor housing peripheral wall 12b. Each suction groove 51 opens at the open end of the motor housing peripheral wall 12b.

[0049] A first suction hole 52 is formed on the outer periphery of the flange wall 19 of the shaft support housing member 13. Therefore, the first suction hole 52 is formed in the shaft support housing member 13. The first suction hole 52 penetrates the flange wall 19 along its thickness direction. The first suction hole 52 communicates with one of a plurality of suction grooves 51. Therefore, the first suction hole 52 communicates with the motor chamber 20 via the suction groove 51.

[0050] like Figure 1 and Figure 2 As shown, multiple connecting grooves 53 are formed on the inner circumferential surface of the discharge housing peripheral wall 14b. Figure 2 As shown, one of the plurality of connecting grooves 53 communicates with the first suction port 52. An annular passage 54 is formed between the fixed peripheral wall 25c and the discharge housing peripheral wall 14b. The plurality of connecting grooves 53 together with the fixed peripheral wall 25c define the annular passage 54. The annular passage 54 communicates with the first suction port 52.

[0051] A second suction port 55 is formed on the fixed peripheral wall 25c. The second suction port 55 is formed in the fixed peripheral wall 25c in such a way that it penetrates the fixed peripheral wall 25c along its thickness direction. The second suction port 55 communicates with the annular passage 54. The second suction port 55 communicates with the outermost peripheral portion of the compression chamber 27. In this way, the suction passage 50 connects the motor chamber 20 and the compression chamber 27.

[0052] like Figure 1 As shown, the refrigerant in the motor chamber 20 is drawn into the compression chamber 27 through the suction groove 51, the first suction port 52, the annular passage 54, and the second suction port 55. The refrigerant drawn into the compression chamber 27 is compressed in the compression chamber 27 by the revolution of the vortex disk 26.

[0053] like Figure 2As shown, when viewed from the axial direction of the rotation axis 15, the straight line intersecting the axis L1 of the rotation axis 15 and extending vertically is designated as the first straight line L11. The straight line intersecting the axis L1 of the rotation axis 15 when viewed from the axial direction and extending at a 30-degree angle relative to the first straight line L11 towards one side of the circumferential direction of the rotation axis 15 is designated as the second straight line L12. The straight line intersecting the axis L1 of the rotation axis 15 when viewed from the axial direction and extending at a 30-degree angle relative to the first straight line L11 towards the other side of the circumferential direction of the rotation axis 15 is designated as the third straight line L13. Figure 2 In the diagram, the second straight line L12 is inclined clockwise relative to the first straight line L11. The third straight line L13 is inclined counterclockwise relative to the first straight line L11.

[0054] The discharge housing peripheral wall 14b has an inner peripheral surface that divides the annular passage 54. The inner peripheral surface of the discharge housing peripheral wall 14b has a lower portion located vertically below the axis L1 of the rotation axis 15 and an upper portion located vertically above the axis L1 of the rotation axis 15. When viewed axially from the rotation axis 15, the intersection of the lower portion of the inner peripheral surface of the discharge housing peripheral wall 14b with the second straight line L12 is designated as the first intersection point P1. When viewed axially from the rotation axis 15, the intersection of the lower portion of the inner peripheral surface of the discharge housing peripheral wall 14b with the third straight line L13 is designated as the second intersection point P2. When viewed axially from the rotation axis 15, the straight line passing through the first intersection point P1 and the second intersection point P2 and extending horizontally is designated as the fourth straight line L14.

[0055] When viewed axially from the rotation axis 15, the straight line intersecting the axis L1 of the rotation axis 15 and extending horizontally is designated as the fifth straight line L15. When viewed axially from the rotation axis 15, the intersection point of the upper part of the inner circumferential surface of the discharge housing peripheral wall 14b and the second straight line L12 is designated as the third intersection point P3. When viewed axially from the rotation axis 15, the intersection point of the upper part of the inner circumferential surface of the discharge housing peripheral wall 14b and the third straight line L13 is designated as the fourth intersection point P4. When viewed axially from the rotation axis 15, the straight line passing through the third intersection point P3 and the fourth intersection point P4 and extending horizontally is designated as the sixth straight line L16.

[0056] The first suction hole 52 communicates with one of the plurality of connecting grooves 53 located on the upper side of the axis L1 of the rotation shaft 15 in the vertical direction and between the second straight line L12 and the third straight line L13. The second suction hole 55 is formed on the fixed peripheral wall 25c at the upper side of the axis L1 of the rotation shaft 15 in the vertical direction and between the second straight line L12 and the third straight line L13.

[0057] <Gap>

[0058] The spiral scroll wall 26b has an inner end that converges in a spiral shape toward the center of the spiral scroll disk 26 and a winding end 26f on the opposite side of the spiral scroll wall 26b. A gap 56 is formed between the fixed scroll wall 25b and the winding end 26f of the spiral scroll wall 26b. Figure 2 The imaginary circle C11 depicts the trajectory of the winding end 26f of the spiral scroll wall 26b as the spiral scroll disk 26 revolves. The imaginary 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, as the spiral scroll disk 26 revolves, the winding end 26f of the spiral scroll 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. Consequently, the gap 56 is located vertically above the axis L1 of the rotation axis 15 and between the second line L12 and the third line L13.

[0059] <Liquid Refrigerant Storage Section>

[0060] The scroll compressor 10 includes a liquid refrigerant storage section 57. The liquid refrigerant storage section 57 is disposed within an annular passage 54. The liquid refrigerant storage section 57 restricts the liquid refrigerant generated by the liquefaction of refrigerant within the annular passage 54 from being drawn into the compression chamber 27 through the second suction port 55, and stores the liquid refrigerant. When the annular passage 54 is viewed axially from the rotation axis 15, the region in the annular passage 54 that is lower in the vertical direction than the sixth straight line L16 becomes the liquid refrigerant storage section 57. Therefore, when the annular passage 54 is viewed axially from the rotation axis 15, the region in the annular passage 54 that is lower in the vertical direction than the fifth straight line L15 becomes the liquid refrigerant storage section 57. Thus, when the annular passage 54 is viewed axially from the rotation axis 15, the region in the annular passage 54 that is lower in the vertical direction than the fourth straight line L14 becomes the liquid refrigerant storage section 57.

[0061] The second suction port 55 is formed in the fixed peripheral wall 25c at a position located vertically above the liquid refrigerant storage section 57. The first suction port 52 is formed in the shaft support housing member 13 at a position vertically above the liquid refrigerant storage section 57.

[0062] <Oil Delivery Pathway>

[0063] like Figure 1 As shown, the lower part of the motor chamber 20 forms an oil reservoir 58. The oil reservoir 58 stores oil contained in the refrigerant. The scroll compressor 10 includes an oil inlet passage 59. Figure 1 and Figure 2As shown, the oil inlet 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 member 13. The small-diameter hole 60 connects the oil storage section 58 to the annular passage 54.

[0064] like Figure 2 As shown, the small-diameter hole 60 is connected to a connecting groove 53 located on the lower side of the axis L1 of the rotation shaft 15 in the vertical direction 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 is connected to the region in the annular passage 54 that is on the lower side of the fourth straight line L14 in the vertical direction.

[0065] An oil intake port 61 is formed in the fixed peripheral wall 25c. Specifically, when viewed axially from the rotation axis 15, the oil intake port 61 is located in the region of the fixed peripheral wall 25c that is lower in the vertical direction than the fourth straight line L14. The oil intake port 61 penetrates the fixed peripheral wall 25c radially along the rotation axis 15. The oil intake port 61 connects the annular passage 54 to the inner side of the fixed peripheral wall 25c. The oil introduction passage 59 introduces the oil stored in the oil reservoir 58 into the inner side of the fixed peripheral wall 25c.

[0066] [The Role of the Implementation Method]

[0067] Next, the function of this embodiment will be explained.

[0068] In the scroll compressor 10 of this embodiment, when the scroll compressor 10 stops, the refrigerant in the annular passage 54 is sometimes cooled and liquefied. The liquid refrigerant generated in the annular passage 54 is stored in the liquid refrigerant storage section 57 within the annular passage 54. In this embodiment, the second suction port 55 is formed in the fixed peripheral wall 25c at a position 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 via the second suction port 55. Therefore, liquid compression in the compression chamber 27 is suppressed. Furthermore, the flow of liquid refrigerant from the compression chamber 27 into the back pressure chamber 45 via the gas supply passage 46 is suppressed.

[0069] The pressure difference between the annular passage 54 and the inner side of the fixed peripheral wall 25c increases or decreases with the revolution of the rotary scroll 26. When the pressure on the inner side of the fixed peripheral wall 25c decreases, oil is supplied from the oil reservoir 58 into the annular passage 54 through the small-diameter orifice 60, and the oil supplied into the annular passage 54 is drawn into the oil suction port 61 and reaches the inner side of the fixed peripheral wall 25c. In this way, the oil in the oil reservoir 58 is intermittently introduced into the inner side of the fixed peripheral wall 25c through the oil inlet passage 59. Therefore, the lubrication between the fixed scroll 25 and the rotary scroll 26 is good.

[0070] On the other hand, for example, even if liquid refrigerant accumulates in the lower part of the motor chamber 20, the inflow of liquid refrigerant to the inner side of the fixed peripheral wall 25c via the oil inlet passage 59 becomes intermittent. Therefore, even if the scroll compressor 10 has the oil inlet passage 59, it is possible to prevent liquid refrigerant from being drawn into the compression chamber 27.

[0071] [Effects of the Implementation Method]

[0072] The following effects can be obtained from the above embodiments.

[0073] (1) The liquid refrigerant generated by the liquefaction of refrigerant in the annular passage 54 is stored in the liquid refrigerant storage section 57 within the annular passage 54. In this embodiment, the second suction port 55 is formed on the fixed peripheral wall 25c at a position 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 drawn into the compression chamber 27 through the second suction port 55. As a result, liquid compression in the compression chamber 27 can be suppressed, and thus, it is possible to prevent the pressure in the compression chamber 27 from abnormally becoming high. Therefore, it is possible to suppress the deterioration of the durability of the compression mechanism C1. As a result, the reliability of the scroll compressor 10 can be improved.

[0074] (2) Although the scroll compressor 10 is configured to have a gas supply passage 46 formed in the rotating scroll 26, it is possible to prevent the liquid refrigerant generated in the annular passage 54 from being drawn into the compression chamber 27 through the second suction 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 gas supply passage 46. As a result, it is possible to prevent the problem of excessive pressure rise in the back pressure chamber 45 due to the vaporization of liquid refrigerant in the back pressure chamber 45.

[0075] (3) The second suction port 55 is formed in the fixed peripheral wall 25c, located on the upper side of the axis L1 of the rotating shaft 15 in the vertical direction and between the second straight line L12 and the third straight line L13. The gap 56 formed between the winding end 26f of the fixed scroll wall 25b and the rotating scroll wall 26b is located on the upper side of the axis L1 of the rotating shaft 15 in the vertical direction and between the second straight line L12 and the third straight line L13. Therefore, the refrigerant sucked in from the second suction port 55 can easily flow into the gap 56 formed between the winding end 26f of the fixed scroll wall 25b and the rotating scroll wall 26b. Therefore, the refrigerant can be efficiently sucked into the compression chamber 27, thereby improving the compression efficiency of the scroll compressor 10.

[0076] (4) The first suction port 52 is formed in the shaft support housing member 13 at a position that is vertically higher than the liquid refrigerant storage section 57. As a result, it is easier to restrict the flow of liquid refrigerant generated by the liquefaction of refrigerant in the motor chamber 20 to the annular passage 54 through the first suction port 52. Consequently, it is easier to suppress the intake of liquid refrigerant into the compression chamber 27.

[0077] (5) The lower part of the motor chamber 20 becomes an oil reservoir 58 for storing oil contained in the refrigerant. The scroll compressor 10 is provided with an oil inlet passage 59 for introducing the oil stored in the oil reservoir 58 into the inner side of the fixed peripheral wall 25c. Thus, the oil stored in the lower part of the oil reservoir 58 can be introduced into the inner side of the fixed peripheral wall 25c via the oil inlet passage 59. Therefore, good lubrication between the fixed scroll 25 and the rotating scroll 26 can be achieved.

[0078] (6) The pressure difference between the annular passage 54 and the inner side of the fixed peripheral wall 25c increases or decreases with the revolution of the rotary scroll 26. When the pressure on the inner side of the fixed peripheral wall 25c decreases, oil is supplied from the oil reservoir 58 to the annular passage 54 through the small-diameter orifice 60, and the oil supplied to the annular passage 54 is drawn in through the oil inlet 61 and reaches the inner side of the fixed peripheral wall 25c. In this way, the oil stored in the oil reservoir 58 is intermittently introduced into the inner side of the fixed peripheral wall 25c through the oil inlet passage 59. On the other hand, for example, even if liquid refrigerant accumulates in the lower part of the motor chamber 20, the inflow of liquid refrigerant into the inner side of the fixed peripheral wall 25c through the oil inlet passage 59 becomes intermittent. Therefore, even if the scroll compressor 10 is equipped with the oil inlet passage 59, it is possible to suppress the intake of liquid refrigerant into the compression chamber 27. Therefore, liquid compression in the compression chamber 27 can be suppressed, and good lubrication between the fixed scroll 25 and the rotary scroll 26 can be achieved.

[0079] (7) When the annular passage 54 is viewed axially from the rotation axis 15, the area in the annular passage 54 that is lower in the vertical direction than the fifth straight line L15 becomes the liquid refrigerant storage section 57. Therefore, the liquid refrigerant generated by liquefaction of the refrigerant within the annular passage 54 can be more easily stored in the liquid refrigerant storage section 57 within the annular passage 54. Therefore, it is easier to suppress the liquid refrigerant generated within the annular passage 54 from being drawn into the compression chamber 27 via the second suction port 55. Therefore, it is easier to suppress liquid compression in the compression chamber 27.

[0080] (8) When the annular passage 54 is viewed axially from the rotation axis 15, the area in the annular passage 54 that is lower in the vertical direction than the sixth straight line L16 becomes the liquid refrigerant storage section 57. Therefore, the liquid refrigerant generated by the liquefaction of the refrigerant within the annular passage 54 can be more easily stored in the liquid refrigerant storage section 57 within the annular passage 54. Therefore, it is easier to suppress the liquid refrigerant generated within the annular passage 54 from being drawn into the compression chamber 27 via the second suction port 55. Therefore, it is easier to suppress liquid compression in the compression chamber 27.

[0081] [Example of Change]

[0082] The above-described embodiments can be implemented by modification as follows. The above-described embodiments and the following modifications can be combined with each other within the scope of technical inconsistency.

[0083] In this embodiment, when the fixed peripheral wall 25c is viewed axially from the rotation axis 15, the second suction hole 55 may also be formed in the portion of the fixed peripheral wall 25c located between the fifth straight line L15 and the sixth straight line L16. In this case, the first suction hole 52 may also communicate with the communication groove 53 located between the fifth straight line L15 and the sixth straight line L16, and with the communication groove 53 corresponding to the second suction hole 55. Even in this case, when the annular passage 54 is viewed axially from the rotation axis 15, the area in the annular passage 54 that is lower in the vertical direction than the fifth straight line L15 is also referred to as the liquid refrigerant storage section 57.

[0084] In this embodiment, when the fixed peripheral wall 25c is viewed axially from the rotation axis 15, the second suction hole 55 may also be formed in the fixed peripheral wall 25c at the portion located between the fourth straight line L14 and the fifth straight line L15. In this case, the first suction hole 52 may also communicate with one of the plurality of communicating grooves 53 located between the fourth straight line L14 and the fifth straight line L15 and corresponding to the second suction hole 55. Even in this case, when the annular passage 54 is viewed axially from the rotation axis 15, the area of ​​the annular passage 54 that is lower in the vertical direction than the fourth straight line L14 also becomes the liquid refrigerant storage section 57. In short, the second suction hole 55 may not be formed in the fixed peripheral wall 25c at the portion located vertically higher than the axis L1 of the rotation axis 15 and between the second straight line L12 and the third straight line L13. The second suction hole 55 only needs to be formed in the portion of the fixed peripheral wall 25c located vertically higher than the liquid refrigerant storage section 57. When the annular passage 54 is viewed from the axial direction of the rotation axis 15, the area at least on the lower side in the vertical direction of the fourth straight line L14 can be considered as the liquid refrigerant storage section 57.

[0085] In this embodiment, the second suction hole 55 may not be formed on the fixed peripheral wall 25c at a position that is vertically higher than the axis L1 of the rotation shaft 15 and located between the second straight line L12 and the third straight line L13. In this case, the gap 56 formed between the winding end 26f of the fixed scroll wall 25b and the swirling scroll wall 26b may also not be located at a position that is vertically higher than the axis L1 of the rotation shaft 15 and between the second straight line L12 and the third straight line L13.

[0086] In one embodiment, the first suction hole 52 may not be formed on the part of the shaft support housing member 13 located on the upper side in the vertical direction than the liquid refrigerant storage section 57.

[0087] In one embodiment, the oil inlet passage 59 may not have an oil suction port 61. For example, the first end of the small diameter hole 60 may be connected to the oil storage section 58, and the second end of the small diameter hole 60 may be connected to the inner side of the fixed peripheral wall 25c.

[0088] In some embodiments, the scroll compressor 10 may also be a structure without the oil inlet passage 59.

[0089] In this embodiment, the number of first suction holes 52 is not particularly limited.

[0090] In this embodiment, the number of second suction holes 55 is not particularly limited.

[0091] In some embodiments, the scroll compressor 10 may not be driven by the motor 22, but may be driven by the vehicle's engine.

[0092] In this embodiment, the scroll compressor 10 is used in a vehicle air conditioning system, but is not limited thereto. In short, the scroll compressor 10 can be used to compress refrigerant, and its application can be appropriately modified.

Claims

1. A scroll compressor, comprising: Rotation axis; A compression mechanism, configured to be driven by rotation of the rotating shaft, and having a compression chamber configured to compress a refrigerant; and The housing supports the rotating shaft for rotatability and has an intake chamber for drawing in refrigerant from the outside, an exhaust chamber for discharging refrigerant compressed by the compression chamber, and an intake passage for refrigerant drawn from the intake chamber into the compression chamber. The compression mechanism comprises: A fixed scroll, fixed to the housing, and having a fixed base plate, a fixed scroll wall extending axially from the fixed base plate along the rotation axis, and a fixed peripheral wall extending axially from the fixed base plate along the rotation axis and surrounding the fixed scroll wall; and A swirling scroll, configured to revolve within the fixed peripheral wall as the rotation axis rotates, and having a swirling base plate opposite the fixed base plate and a swirling scroll wall extending from the swirling base plate toward the fixed base plate and engaging with the fixed scroll wall. The compression chamber is divided by the fixed base plate, the fixed scroll wall, the rotating base plate, and the rotating scroll wall. The housing has: A shaft support housing member is disposed on the opposite side of the fixed base plate relative to the rotating base plate, and supports the rotating shaft; as well as A discharge housing component has a discharge housing end wall and a cylindrical discharge housing peripheral wall extending from the discharge housing end wall and surrounding the fixed peripheral wall, and divides the discharge chamber between the discharge housing end wall and the fixed base plate. The inhalation pathway has: A first intake port is formed in the shaft support housing member and communicates with the intake chamber; An annular passage is formed between the fixed peripheral wall and the peripheral wall of the discharge housing and communicates with the first suction hole; as well as A second suction port is formed on the fixed peripheral wall and communicates with the annular passage. in, The peripheral wall of the discharge housing has an inner peripheral surface that divides the annular passage, and the inner peripheral surface has a lower portion located on the lower side in the vertical direction than the axis of the rotation shaft. When viewed from the axial direction of the rotation axis, The straight line that intersects the axis of rotation and extends vertically is the first straight line. The second straight line is the straight line that intersects the axis of rotation and extends at a 30-degree angle relative to the first straight line towards one side of the circumferential direction of the axis of rotation. The third straight line is the straight line that intersects the axis of rotation and extends at a 30-degree angle relative to the first straight line toward the other side of the circumference of the axis of rotation. The intersection point of the lower portion of the inner circumferential surface and the second straight line is the first intersection point. The intersection point of the lower portion of the inner circumferential surface and the third straight line is the second intersection point. The fourth line is the straight line that passes through the first intersection point and the second intersection point and extends horizontally. When the annular passage is viewed axially from the rotation axis, the area of ​​the annular passage that is lower in the vertical direction than the fourth straight line is the liquid refrigerant storage section. The liquid refrigerant storage section is configured to allow liquid refrigerant, generated by restricting the liquefaction of the refrigerant within the annular passage, to be drawn into the compression chamber via the second suction port from the annular passage, and to store the liquid refrigerant. The second suction hole is formed on the fixed peripheral wall at a position that is vertically higher than the liquid refrigerant storage section.

2. The scroll compressor according to claim 1, wherein, A back pressure chamber is defined between the gyratory base plate and the shaft support housing member. This back pressure chamber is used to introduce refrigerant to exert force on the gyratory scroll towards the fixed scroll. An air supply passage is formed in the vortex disk, which is configured to supply a portion of the refrigerant compressed by the compression chamber to the back pressure chamber.

3. The scroll compressor according to claim 1 or 2, wherein, The second suction hole is formed at a location on the fixed peripheral wall, on the upper side of the vertical direction relative to the axis of the rotation shaft, and between the second straight line and the third straight line. The gap formed between the fixed scroll wall and the winding end of the swirling scroll wall is located on the upper side of the vertical direction 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, wherein, The first suction port is formed on the shaft support housing member at a position that is vertically higher than the liquid refrigerant storage section.

5. The scroll compressor according to claim 1 or 2, wherein, The lower part of the intake chamber is an oil storage section for storing the oil contained in the refrigerant. The scroll compressor also has an oil inlet passage configured to guide oil stored in the oil storage section into the inner side of the fixed peripheral wall.

6. The scroll compressor according to claim 5, wherein, The oil introduction passage has the following characteristics: A small-diameter bore, formed in the shaft support housing member and communicating with the oil reservoir and the annular passage; and An oil intake port is formed on the fixed peripheral wall and connects the annular passage to the inside of the fixed peripheral wall.

7. The scroll compressor according to claim 1, wherein, When viewed from the axial direction of the rotation axis, the straight line that intersects the axis of rotation and extends horizontally is the fifth straight line. When the annular passage is viewed from the axial direction of the rotation axis, the area of ​​the annular passage that is lower in the vertical direction than the fifth straight line is the liquid refrigerant storage section.

8. The scroll compressor according to claim 7, wherein, The inner circumferential surface of the discharge housing peripheral wall has an upper portion located on the upper side in the vertical direction than the axis of the rotation shaft. The intersection point of the upper part of the inner circumferential surface and the second straight line is the third intersection point. The intersection point of the upper part of the inner circumferential surface and the third straight line is the fourth intersection point. The sixth line is the straight line that passes through the third intersection point and the fourth intersection point and extends horizontally. When the annular passage is viewed from the axial direction of the rotation axis, the area of ​​the annular passage that is lower in the vertical direction than the sixth straight line is the liquid refrigerant storage section.

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