Scroll compressor

Abstract

The invention relates to a scroll compressor. A main discharge port is formed in the center of the fixed substrate. A sub-discharge port is formed in a position different from the main discharge port in the fixed substrate. A main recess that opens toward the main reed valve such that the cross-sectional area of the flow path of the fluid increases is formed in the main discharge port. The auxiliary discharge port is formed with an auxiliary recess that opens toward the auxiliary reed valve such that the cross-sectional area of the fluid flow path becomes large. A sealing area for sealing the sub-recess by contact between the fixed substrate and the sub-reed valve is larger than a sealing area for sealing the main recess by contact between the fixed substrate and the main reed valve.

Description

Technical Field

[0001] The present disclosure relates to scroll-type compressors. Background Art

[0002] A scroll compressor includes a housing, a rotating shaft, and a compression mechanism. The housing has a housing suction port and a housing discharge port. The housing suction port draws in fluid. The housing discharge port discharges fluid. The rotating shaft is housed within the housing. The rotating shaft is supported by the housing so as to be rotatable about the axis of the rotating shaft. The compression mechanism is housed within the housing. The compression mechanism includes a fixed scroll and an orbiting scroll. The fixed scroll is fixed to the housing. The orbiting scroll revolves around the axis of the rotating shaft as the rotating shaft rotates.

[0003] The housing is divided into a suction chamber, a compression chamber, and a discharge chamber. Fluid is drawn into the suction chamber from the housing's suction port. The compression chamber communicates with the suction chamber. In the compression chamber, the fluid is compressed by the meshing of the fixed scroll and the orbiting scroll. The discharge chamber can communicate with the compression chamber. Fluid is discharged from the compression chamber into the discharge chamber.

[0004] The fixed scroll comprises a disc-shaped fixed baseplate and a spiral-shaped fixed scroll wall. The fixed scroll wall rises from the fixed baseplate. The orbiting scroll comprises a disc-shaped orbiting baseplate and a spiral-shaped orbiting scroll wall. The orbiting baseplate faces the fixed baseplate. The orbiting scroll wall rises from the orbiting baseplate toward the fixed baseplate. A main discharge port is formed in the center of the fixed baseplate. The main discharge port discharges compressed fluid into a discharge chamber.

[0005] In such scroll compressors, when a liquefied fluid, such as a liquid refrigerant, is drawn into the compression chamber, liquid compression may occur within the compression chamber. This liquid compression can lead to abnormally high pressure within the compression chamber. Such overcompression can cause problems such as deformation of the fixed scroll and orbiting scroll, thereby deteriorating the reliability of the scroll compressor.

[0006] Therefore, a scroll compressor equipped with a secondary discharge port is known, such as that disclosed in Japanese Patent Application Laid-Open No. 61-223288. In the scroll compressor disclosed in Japanese Patent Application Laid-Open No. 61-223288, the secondary discharge port discharges fluid from the compression chamber when the pressure in the compression chamber reaches a set pressure or higher. Thus, even if liquefied fluid is drawn into the compression chamber, it is discharged from the secondary discharge port before the pressure in the compression chamber reaches abnormally high pressure. This prevents the pressure in the compression chamber from becoming abnormally high. Summary of the Invention

[0007] Problems to be solved by the invention

[0008] When such a sub-discharge port is formed at a different location on the fixed base plate from the main discharge port, a plate-shaped main reed valve and a plate-shaped sub-reed valve are provided on the fixed base plate. The main reed valve opens and closes the main discharge port. The sub-reed valve opens and closes the sub-discharge port. During normal operation of the scroll compressor, even though the pressure in the compression chamber does not exceed the set pressure, the sub-reed valve may open due to pressure fluctuations within the compression chamber. This may cause fluid being compressed within the compression chamber to leak into the discharge chamber through the sub-discharge port, even though the pressure in the compression chamber does not exceed the set pressure. This may result in a decrease in the compression efficiency of the scroll compressor.

[0009] Means for solving problems

[0010] A scroll compressor according to one embodiment of the present disclosure includes: a housing having a housing intake port for drawing in fluid and a housing discharge port for discharging fluid; a rotating shaft housed within the housing and supported by the housing for rotation about the axis of the rotating shaft; and a compression mechanism housed within the housing and comprising a fixed scroll fixed to the housing and an orbiting scroll configured to orbit about the axis as the rotating shaft rotates. The housing is divided into: a suction chamber for drawing in fluid from the housing intake port; a compression chamber communicating with the suction chamber and compressing fluid through meshing between the fixed scroll and the orbiting scroll; and a discharge chamber communicating with the compression chamber and discharging fluid from the compression chamber. The fixed scroll includes a disk-shaped fixed base plate and a spiral-shaped fixed scroll wall extending from the fixed base plate. The orbiting scroll includes a disk-shaped orbiting base plate facing the fixed base plate and a spiral-shaped orbiting scroll wall extending from the orbiting base plate toward the fixed base plate. A main discharge port is formed in the center of the fixed baseplate, discharging compressed fluid into the discharge chamber. A secondary discharge port is formed in a location on the fixed baseplate, separate from the main discharge port, to discharge fluid from the compression chamber into the discharge chamber when the pressure in the compression chamber reaches a set pressure or higher. A plate-shaped main reed valve, configured to open and close the main discharge port, and a plate-shaped secondary reed valve, configured to open and close the secondary discharge port, are provided on the fixed baseplate. A main recess is formed in the main discharge port, opening toward the main reed valve to increase the cross-sectional area of ​​the flow path for fluid discharged toward the main reed valve. A secondary recess is formed in the secondary discharge port, opening toward the secondary reed valve to increase the cross-sectional area of ​​the flow path for fluid discharged toward the secondary reed valve. The sealing area of ​​the secondary recess, sealed by contact between the fixed baseplate and the secondary reed valve, is larger than the sealing area of ​​the main recess, sealed by contact between the fixed baseplate and the main reed valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a cross-sectional view showing a scroll compressor according to an embodiment.

[0012] Figure 2 yes Figure 1 A perspective view of a fixed scroll member of a scroll compressor.

[0013] Figure 3 Yes Figure 2 A three-dimensional diagram of the fixed scroll and valve mechanism.

[0014] Figure 4 It will Figure 2 A perspective view showing an enlarged portion of a fixed scroll member.

[0015] Figure 5 It will Figure 2 An enlarged plan view showing a portion of the fixed scroll.

[0016] Figure 6 Yes Figure 2 Plan view of the fixed scroll and reed valve.

[0017] Figure 7 It will Figure 2 An enlarged plan view showing a portion of the fixed scroll and the reed valve. DETAILED DESCRIPTION

[0018] The following, according to Figures 1 to 7 An embodiment of a scroll compressor will be described. The scroll compressor of this embodiment is used in, for example, a vehicle air conditioner.

[0019] <Basic Structure of Scroll Compressor>

[0020] like Figure 1 As shown, the scroll compressor 10 includes a cylindrical housing 11. The housing 11 includes a motor housing member 12, a shaft-supporting housing member 13, and a discharge housing member 14. The motor housing member 12, the shaft-supporting housing member 13, and the discharge housing member 14 are made of metal. For example, the motor housing member 12, the shaft-supporting housing member 13, and the discharge housing member 14 are made of aluminum. Furthermore, the scroll compressor 10 includes a rotating shaft 15. The rotating shaft 15 is housed within the housing 11.

[0021] The motor housing member 12 has a plate-shaped end wall 12a and a cylindrical peripheral wall 12b. The peripheral wall 12b extends in a cylindrical shape from the outer periphery of the end wall 12a. The axial direction of the peripheral wall 12b coincides with the axial direction of the rotating shaft 15. The motor housing member 12 has a housing suction port 12h. Therefore, the housing 11 has a housing suction port 12h. The housing suction port 12h is formed in the peripheral wall 12b. The housing suction port 12h is formed in a portion of the peripheral wall 12b that is located near the end wall 12a. The housing suction port 12h connects the inside and outside of the motor housing member 12. The housing suction port 12h draws in refrigerant gas as a fluid.

[0022] The motor housing member 12 has a cylindrical boss portion 12d. The boss portion 12d protrudes from the inner surface of the end wall 12a. The rotating shaft 15 has a first end portion serving as an end portion on one side of the axial direction of the rotating shaft 15 and a second end portion serving as an end portion on the other side. The first end portion of the rotating shaft 15 is inserted into the boss portion 12d. The scroll compressor 10 includes a rolling bearing 16. The rolling bearing 16 is provided between the inner peripheral surface of the boss portion 12d and the outer peripheral surface of the first end portion of the rotating shaft 15. Furthermore, the first end portion of the rotating shaft 15 is rotatably supported by the motor housing member 12 via the rolling bearing 16.

[0023] The shaft supporting housing member 13 includes a disc-shaped end wall 17 and a cylindrical peripheral wall 18. The peripheral wall 18 extends cylindrically from the outer periphery of the end wall 17. The axial direction of the peripheral wall 18 coincides with the axial direction of the rotating shaft 15. The shaft supporting housing member 13 includes an annular flange wall 19. The flange wall 19 extends radially outward from the end of the outer periphery of the peripheral wall 18 opposite the end wall 17 toward the radially outer side of the rotating shaft 15. The outer periphery of the flange wall 19 contacts the open end of the peripheral wall 12b of the motor housing member 12.

[0024] The shaft-supporting housing member 13 has an insertion hole 17a. The insertion hole 17a is formed in the center portion of the end wall 17. The insertion hole 17a penetrates the end wall 17 in the thickness direction. The rotating shaft 15 is inserted into the insertion hole 17a. The end surface 15e of the second end portion of the rotating shaft 15 is located on the inner side of the peripheral wall 18. The scroll compressor 10 includes a rolling bearing 21. The rolling bearing 21 is provided between the inner peripheral surface of the peripheral wall 18 and the outer peripheral surface of the rotating shaft 15. The rotating shaft 15 is rotatably supported by the shaft-supporting housing member 13 via the rolling bearing 21. In this way, the rotating shaft 15 is rotatably supported by the housing 11 about its axis L1.

[0025] The housing 11 includes a motor chamber S1. The motor chamber S1 is defined by the motor housing member 12 and the shaft support housing member 13. The motor chamber S1 communicates with the housing suction port 12h. Refrigerant gas is drawn into the motor chamber S1 through the housing suction port 12h. Therefore, the motor chamber S1 serves as a suction chamber for refrigerant gas drawn from the housing suction port 12h. Thus, the housing 11 defines a suction chamber.

[0026] The scroll compressor 10 includes a motor 22. The motor 22 is housed in a motor chamber S1. The motor 22 includes a cylindrical stator 23 and a cylindrical rotor 24. The rotor 24 is arranged inside the stator 23. The rotor 24 rotates integrally with the rotating shaft 15. The stator 23 surrounds the rotor 24. The rotor 24 includes a rotor core 24a fixed to the rotating shaft 15 and a plurality of permanent magnets (not shown) provided on the rotor core 24a. The stator 23 includes a cylindrical stator core 23a and a coil 23b. The stator core 23a is fixed to the inner circumferential surface of the peripheral wall 12b of the motor housing member 12. The coil 23b is wound around the stator core 23a. Furthermore, the rotor 24 rotates by supplying power controlled by an inverter (not shown) to the coil 23b. As a result, the rotating shaft 15 and the rotor 24 rotate integrally.

[0027] The scroll compressor 10 includes a compression mechanism C1. The compression mechanism C1 includes a fixed scroll 25 and an orbiting scroll 26. The fixed scroll 25 includes a disc-shaped fixed base plate 25a and a spiral-shaped fixed scroll wall 25b. The fixed scroll wall 25b rises from the fixed base plate 25a. The fixed scroll 25 includes a fixed outer peripheral wall 25c. The fixed outer peripheral wall 25c rises cylindrically from the outer periphery of the fixed base plate 25a. The fixed outer peripheral wall 25c surrounds the fixed scroll wall 25b. The open end face of the fixed outer peripheral wall 25c is located on the side opposite to the fixed base plate 25a than the top face of the fixed scroll wall 25b. In other words, the fixed outer peripheral wall 25c protrudes from the fixed base plate 25a to a greater extent than the fixed scroll wall 25b.

[0028] The swirling scroll 26 has a disc-shaped swirling base plate 26a and a swirling swirling wall 26b. The swirling base plate 26a is opposite to the fixed base plate 25a. The swirling swirling wall 26b rises from the swirling base plate 26a toward the fixed base plate 25a. The swirling swirling wall 26b is engaged with the fixed swirling wall 25b. The swirling swirling wall 26b is located on the inner side of the fixed outer peripheral wall 25c. The top surface of the fixed swirling wall 25b is in contact with the swirling base plate 26a. The top surface of the swirling swirling wall 26b is in contact with the fixed base plate 25a. In addition, a plurality of compression chambers 27 are divided by the fixed base plate 25a, the fixed swirling wall 25b, the swirling base plate 26a and the swirling swirling wall 26b. Therefore, a plurality of compression chambers 27 are divided by the fixed scroll 25 and the swirling scroll 26. In each compression chamber 27, the refrigerant gas is compressed. Thus, a compression chamber 27 is defined in which the refrigerant gas is compressed by the meshing of the fixed scroll 25 and the orbiting scroll 26. Therefore, the compression chamber 27 is defined in the casing 11.

[0029] The orbiting scroll 26 has a cylindrical boss 26c that protrudes from the center of an end surface 26e of the orbiting base plate 26a opposite to the fixed base plate 25a. The axial direction of the boss 26c coincides with the axial direction of the rotating shaft 15.

[0030] The orbiting scroll 26 has a plurality of recesses 26d. The plurality of recesses 26d are formed around the protrusion 26c in the end surface 26e of the orbiting base plate 26a. The plurality of recesses 26d are arranged at predetermined intervals in the circumferential direction of the rotating shaft 15. Figure 1 For ease of explanation, only one recess 26d is shown. An annular ring member 28 is embedded in recess 26d. The scroll compressor 10 includes a plurality of pins 29. Pins 29 are provided on the shaft-supporting housing member 13. The shaft-supporting housing member 13 has an end surface 13e that faces the orbiting scroll 26. Pins 29 protrude from the end surface 13e of the shaft-supporting housing member 13. Pins 29 are inserted into the ring member 28.

[0031] The scroll compressor 10 includes an eccentric shaft 31. The eccentric shaft 31 protrudes from the end surface 15e of the rotating shaft 15 toward the orbiting scroll 26. The eccentric shaft 31 is disposed at a portion of the end surface 15e of the rotating shaft 15 that is eccentric relative to the axis L1 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 26c.

[0032] The scroll compressor 10 includes a balance weight 32 and a bushing 33. The balance weight 32 and the bushing 33 are integrated. The bushing 33 is embedded in the outer peripheral surface of the eccentric shaft 31. The balance weight 32 and the bushing 33 are formed integrally. The balance weight 32 is accommodated in the peripheral wall 18 of the shaft support housing member 13. The orbiting scroll 26 is supported on the eccentric shaft 31 via the bushing 33 and the rolling bearing 34 so as to be rotatable relative to the eccentric shaft 31.

[0033] The rotation of the rotating shaft 15 is transmitted to the orbiting scroll 26 via the eccentric shaft 31, the bushing 33, and the rolling bearing 34. In addition, the pin 29 contacts the inner circumferential surface of the ring member 28, thereby preventing the orbiting scroll 26 from rotating on its own and allowing only the orbiting scroll 26 to revolve. As a result, the orbiting scroll 26 revolves around the axis L1 of the rotating shaft 15 while the orbiting scroll wall 26b contacts the fixed scroll wall 25b, reducing the volume of the compression chamber 27 and compressing the refrigerant gas. Therefore, the orbiting scroll 26 revolves around the axis L1 of the rotating shaft 15 due to the rotation of the rotating shaft 15. The balancing weight 32 offsets the centrifugal force acting on the orbiting scroll 26 when the orbiting scroll 26 revolves, reducing the imbalance of the orbiting scroll 26.

[0034] The discharge housing member 14 includes a plate-shaped end wall 14a and a cylindrical peripheral wall 14b. The peripheral wall 14b extends cylindrically from the outer periphery of the end wall 14a. The axial direction of the peripheral wall 14b coincides with the axial direction of the rotating shaft 15. The open end of the peripheral wall 14b contacts the outer periphery of the flange wall 19. The peripheral wall 14b surrounds the fixed scroll 25. Therefore, the fixed scroll 25 is housed within the housing 11. Thus, the compression mechanism C1 is housed within the housing 11.

[0035] The discharge housing member 14, the shaft-supporting housing member 13, and the motor housing member 12 are secured together by bolts B1. Bolts B1 penetrate the peripheral wall 14b of the discharge housing member 14 and the outer periphery of the flange wall 19 and are screwed into the peripheral wall 12b of the motor housing member 12. This connects the shaft-supporting housing member 13 to the peripheral wall 12b of the motor housing member 12, and the discharge housing member 14 to the flange wall 19 of the shaft-supporting housing member 13. Consequently, the motor housing member 12, the shaft-supporting housing member 13, and the discharge housing member 14 are arranged in this order in the axial direction of the rotating shaft 15.

[0036] The fixed scroll 25 is sandwiched between the end wall 14a of the discharge housing member 14 and the shaft support housing member 13. In this way, the fixed scroll 25 is fixed to the housing 11.

[0037] The scroll compressor 10 includes a discharge chamber S2. The discharge chamber S2 is formed within the discharge housing member 14. The discharge chamber S2 is defined by the discharge housing member 14 and the fixed base plate 25a of the fixed scroll 25. Thus, the discharge chamber S2 is defined within the housing 11. Refrigerant gas is discharged from the compression chamber 27 into the discharge chamber S2.

[0038] The discharge housing member 14 has a housing discharge port 14h. Therefore, the housing 11 has the housing discharge port 14h. The housing discharge port 14h is formed on the end wall 14a of the discharge housing member 14. The housing discharge port 14h communicates with the discharge chamber S2. The housing discharge port 14h discharges the refrigerant gas in the discharge chamber S2.

[0039] The housing discharge port 14h and the housing suction port 12h are connected to each other via an external refrigerant circuit 20. The external refrigerant circuit 20 includes a condenser, an expansion valve, and an evaporator (not shown). Refrigerant gas discharged from the housing discharge port 14h flows through the external refrigerant circuit 20. The refrigerant gas flowing through the external refrigerant circuit 20 passes through the condenser, the expansion valve, and the evaporator, and then flows back into the motor chamber S1 via the housing suction port 12h. The scroll compressor 10 and the external refrigerant circuit 20 constitute a vehicle air conditioning system.

[0040] The scroll compressor 10 includes a first groove 35, a first hole 36, a second groove 37, and a second hole 38. A plurality of first grooves 35 are formed on the inner peripheral surface of the peripheral wall 12b of the motor housing member 12. The first groove 35 opens at the open end of the peripheral wall 12b. A plurality of first holes 36 are formed on the outer peripheral portion of the flange wall 19 of the shaft-supporting housing member 13. The first hole 36 penetrates the flange wall 19 in the thickness direction. The first hole 36 is connected to the first groove 35. A plurality of second grooves 37 are formed on the inner peripheral surface of the peripheral wall 14b of the discharge housing member 14. The second groove 37 is connected to the first hole 36. In addition, Figure 1 In the figure, for the convenience of illustration, only one of each of the first groove 35, the first hole 36, and the second groove 37 is shown.

[0041] The second hole 38 is formed in the fixed outer peripheral wall 25c of the fixed scroll 25. The second hole 38 penetrates the fixed outer peripheral wall 25c in the thickness direction. The second hole 38 is connected to the second groove 37. The second hole 38 is connected to the outermost peripheral portion of the compression chamber 27. In this way, the compression chamber 27 is connected to the motor chamber S1 via the first groove 35, the first hole 36, the second groove 37, and the second hole 38. The refrigerant gas in the motor chamber S1 is sucked into the compression chamber 27 through the first groove 35, the first hole 36, the second groove 37, and the second hole 38. The refrigerant gas sucked into the compression chamber 27 is compressed in the compression chamber 27 by the revolution of the orbiting scroll 26.

[0042] <Main outlet>

[0043] like Figure 1 and Figure 2 As shown, a main discharge port 40 is formed in the center of the fixed base plate 25a. The main discharge port 40 is in the shape of a circular hole. The main discharge port 40 penetrates the fixed base plate 25a in the thickness direction. The main discharge port 40 has a first end which is an open end on one side of the axial direction of the main discharge port 40 and a second end which is an open end on the other side. The first end of the main discharge port 40 is connected to the compression chamber 27. The second end of the main discharge port 40 is connected to the discharge chamber S2. Therefore, the discharge chamber S2 can be connected to the compression chamber 27 via the main discharge port 40. The main discharge port 40 discharges the refrigerant gas compressed by the compression chamber 27 to the discharge chamber S2.

[0044] <Sub-exhaust outlet>

[0045] like Figure 2 and Figure 3 As shown, a secondary discharge port 41 is formed in a portion of the fixed substrate 25a that is different from the primary discharge port 40. Two secondary discharge ports 41 are formed on the fixed substrate 25a. The two secondary discharge ports 41 are arranged so as to sandwich the primary discharge port 40. The secondary discharge ports 41 are circular holes. They penetrate the fixed substrate 25a in the thickness direction. The aperture of the secondary discharge ports 41 is smaller than that of the primary discharge port 40.

[0046] like Figure 1 As shown, the auxiliary discharge port 41 has a first end serving as one axially open end of the auxiliary discharge port 41 and a second end serving as the other axially open end. The first end of the auxiliary discharge port 41 communicates with the compression chamber 27. The second end of the auxiliary discharge port 41 communicates with the discharge chamber S2. The auxiliary discharge port 41 discharges the refrigerant gas in the compression chamber 27 to the discharge chamber S2 when the pressure in the compression chamber 27 reaches or exceeds a set pressure.

[0047] <Main recess>

[0048] like Figure 4 and Figure 5 As shown, a main recess 42 is formed in the main discharge port 40. The main recess 42 opens into the fixed base plate 25a, on the surface opposite the fixed scroll wall 25b, namely, the base plate end surface 25e. The main recess 42 is circular. The diameter of the main recess 42 is larger than that of the main discharge port 40. The main discharge port 40 opens into the bottom surface 42a of the main recess 42. The axis of the main recess 42 coincides with the axis of the main discharge port 40.

[0049] <Sub-concave>

[0050] A secondary recess 43 is formed in the secondary discharge port 41. The secondary recess 43 opens into the substrate end surface 25e of the fixed substrate 25a. The secondary recess 43 is in the shape of a circular hole. The aperture of the secondary recess 43 is larger than the aperture of the secondary discharge port 41. The secondary discharge port 41 opens into the bottom surface 43a of the secondary recess 43. The axis of the secondary recess 43 is offset relative to the axis of the secondary discharge port 41. The aperture of the secondary recess 43 is smaller than the aperture of the main recess 42. Therefore, the opening area of ​​the secondary recess 43 is smaller than the opening area of ​​the main recess 42.

[0051] <Reed Valve>

[0052] like Figure 3 As shown, the scroll compressor 10 includes a valve mechanism 50 . The valve mechanism 50 is provided on the substrate end surface 25 e of the fixed substrate 25 a . The valve mechanism 50 includes a reed valve 51 and a retainer 52 .

[0053] like Figure 6 and Figure 7 As shown, the reed valve 51 is in the shape of an elastically deformable thin plate. It is made of a metal plate. It includes a fixed portion 53, a main arm 54, a main reed valve 55, a secondary arm 56, and a secondary reed valve 57. The reed valve 51 has two secondary arms 56 and two secondary reed valves 57. The fixed portion 53, the main arm 54, the main reed valve 55, the two secondary arms 56, and the two secondary reed valves 57 are integrally formed from a single metal plate.

[0054] The fixing portion 53 is a long, generally square plate. The fixing portion 53 is the portion of the reed valve 51 that is fixed to the substrate end surface 25e of the fixed substrate 25a. The fixing portion 53 is fixed to the substrate end surface 25e with the thickness of the fixing portion 53 aligned with the thickness of the fixed substrate 25a.

[0055] The main arm 54 and the auxiliary arm 56 are elongated square plates. The main arm 54 and the two auxiliary arm 56 extend from the fixed portion 53 with their respective longitudinal directions aligned. In other words, the main arm 54 and the two auxiliary arm 56 extend from the fixed portion 53 in a mutually parallel manner. The thickness directions of the main arm 54 and the auxiliary arm 56 are aligned with the thickness direction of the fixed portion 53. The main arm 54 extends from the longitudinal center of the fixed portion 53. The two auxiliary arm 56 extend from portions of the fixed portion 53 located on either side of the main arm 54 in the longitudinal direction. The longitudinal directions of the main arm 54 and the auxiliary arm 56 are perpendicular to the longitudinal direction of the fixed portion 53. The main arm 54 extends from the fixed portion 53 toward the main discharge port 40. The two auxiliary arm 56 extend from the fixed portion 53 toward the corresponding auxiliary discharge port 41.

[0056] The main reed valve 55 is continuous with the end portion of the main arm portion 54 on the opposite side from the fixed portion 53 . The main reed valve 55 is substantially disk-shaped and is configured to close the main recess 42 .

[0057] like Figure 7 As shown, the main reed valve 55 has an outer edge 55a and a pair of connecting edges 55b. The outer edge 55a is the portion of the outer edge of the main reed valve 55 that extends along the opening edge of the main recess 42 and has an outer diameter R1 that is slightly larger than the outer diameter of the opening edge of the main recess 42. The pair of connecting edges 55b are the portions of the outer edge of the main reed valve 55 that connect the outer edge 55a to the outer edge of the main arm 54. The imaginary circle extending along the outer edge 55a is the imaginary circle C11.

[0058] The main reed valve 55 is positioned relative to the fixed base plate 25a so that the axis of the main recess 42 aligns with the center of the imaginary circle C11. Therefore, when the main reed valve 55 closes the main recess 42, the outer periphery of the main reed valve 55 contacts the base plate end surface 25e of the fixed base plate 25a. Furthermore, the main reed valve 55 seals the main recess 42 through contact between the fixed base plate 25a and the main reed valve 55. The main reed valve 55 can open and close the main discharge port 40. Therefore, a plate-shaped main reed valve 55 is provided on the fixed base plate 25a to open and close the main discharge port 40. Furthermore, the main recess 42 opens toward the main reed valve 55 so that the cross-sectional area of ​​the flow path for the refrigerant gas discharged toward the main reed valve 55 is increased.

[0059] The sub-reed valve 57 is continuous with the end portion of the sub-arm portion 56 on the opposite side from the fixed portion 53 . The sub-reed valve 57 is substantially disk-shaped and is configured to be able to close the sub-recess 43 .

[0060] The auxiliary reed valve 57 has an outer edge 57a and a pair of connecting edges 57b. The outer edge 57a is the portion of the outer edge of the auxiliary reed valve 57 that extends along the opening edge of the auxiliary recess 43 and has an outer diameter R2 that is slightly larger than the outer diameter of the opening edge of the auxiliary recess 43. The pair of connecting edges 57b are the portions of the outer edge of the auxiliary reed valve 57 that connect the outer edge 57a to the outer edge of the auxiliary arm 56. The imaginary circle extending along the outer edge 57a is the imaginary circle C12.

[0061] The auxiliary reed valve 57 is positioned relative to the fixed base plate 25a so that the axis of the auxiliary recess 43 aligns with the center of the imaginary circle C12. Therefore, when the auxiliary reed valve 57 closes the auxiliary recess 43, the outer periphery of the auxiliary reed valve 57 contacts the base plate end surface 25e of the fixed base plate 25a. Furthermore, the auxiliary reed valve 57 seals the auxiliary recess 43 through the contact between the fixed base plate 25a and the auxiliary reed valve 57. The auxiliary reed valve 57 can open and close the auxiliary discharge port 41. Therefore, a plate-shaped auxiliary reed valve 57 is provided on the fixed base plate 25a to open and close the auxiliary discharge port 41. Furthermore, the auxiliary recess 43 opens toward the auxiliary reed valve 57 so that the cross-sectional area of ​​the flow path for the refrigerant gas discharged toward the auxiliary reed valve 57 is increased.

[0062] The outer diameter R2 of the outer edge 57a of the sub-reed valve 57 is larger than the outer diameter R1 of the outer edge 55a of the main reed valve 55. Therefore, the area of ​​the sub-reed valve 57 is larger than the area of ​​the main reed valve 55.

[0063] like Figure 3 As shown, the retainer 52 is in the shape of a plate thicker than the reed valve 51. The retainer 52 and the reed valve 51 are attached to the fixed base plate 25a by screwing bolts B2 penetrating the fixing portions 53 of the retainer 52 and the reed valve 51 into the fixed base plate 25a.

[0064] The main reed valve 55 is connected to the fixed base plate 25a via a main arm 54 and a fixed portion 53. Therefore, an arm-shaped main arm 54 is provided between the main reed valve 55 and the fixed base plate 25a, connecting the two. The sub-reed valve 57 is connected to the fixed base plate 25a via a sub-arm 56 and a fixed portion 53. Therefore, an arm-shaped sub-arm 56 is provided between the sub-reed valve 57 and the fixed base plate 25a, connecting the two.

[0065] The retainer 52 is warped so as to gradually separate from the fixed base plate 25a as it moves from the fixed portion 53 toward the tips of the main reed valve 55 and the sub-reed valve 57. This allows the main reed valve 55 to swing integrally with the main arm 54 in directions approaching or moving away from the fixed base plate 25a, with the portion of the main arm 54 connected to the fixed portion 53 serving as a base point. Furthermore, the sub-reed valve 57 can swing integrally with the sub-arm 56 in directions approaching or moving away from the fixed base plate 25a, with the portion of the sub-arm 56 connected to the fixed portion 53 serving as a base point.

[0066] The main reed valve 55 opens the main recess 42 by swinging from its position closing the main recess 42 in a direction away from the fixed base plate 25a. Furthermore, the sub-reed valve 57 opens the sub-reed 43 by swinging from its position closing the sub-reed 43 in a direction away from the fixed base plate 25a. The retainer 52 adjusts the openings of the main reed valve 55 and the sub-reed valve 57.

[0067] <Main slot and sub-slot>

[0068] like Figure 6 and Figure 7 As shown, a first escape groove 61, a second escape groove 62, a first escape recess 63, and a second escape recess 64 are formed on the substrate end surface 25e of the fixed substrate 25a. In the following description, one of the two auxiliary arms 56 may be referred to as the first auxiliary arm 561, and the other as the second auxiliary arm 562. The first escape groove 61 extends in a direction perpendicular to the extension direction of the main arm 54 and the first auxiliary arm 561. When the substrate end surface 25e is viewed in plan, a portion of the first escape groove 61 overlaps with the main arm 54 and the first auxiliary arm 561. Therefore, the main arm 54 and the first auxiliary arm 561 pass over the first escape groove 61. Thus, the first escape groove 61 is perpendicular to the extension direction of the main arm 54 and the first auxiliary arm 561 and does not contact the main arm 54 or the first auxiliary arm 561.

[0069] Therefore, the first relief groove 61 functions as a concave main groove that intersects the extension direction of the main arm portion 54 and does not contact the main arm portion 54. Furthermore, the first relief groove 61 also functions as a concave sub-groove that intersects the extension direction of the first sub-arm portion 561 and does not contact the first sub-arm portion 561. Thus, the fixed base plate 25a is provided with a concave main groove that intersects the extension direction of the main arm portion 54 and does not contact the main arm portion 54. Furthermore, the fixed base plate 25a is provided with a concave sub-groove that intersects the extension direction of the first sub-arm portion 561 and does not contact the sub-arm portion 56.

[0070] The second escape groove 62 extends in a direction perpendicular to the direction in which the second auxiliary arm portion 562 extends. When the substrate end surface 25e is viewed in plan view, a portion of the second escape groove 62 overlaps with the second auxiliary arm portion 562. Therefore, the second auxiliary arm portion 562 passes over the second escape groove 62. Thus, the second escape groove 62 is perpendicular to the direction in which the second auxiliary arm portion 562 extends and does not contact the second auxiliary arm portion 562.

[0071] Therefore, the second avoidance groove 62 functions as a concave sub-groove that intersects the extending direction of the second sub-arm portion 562 and does not contact the second sub-arm portion 562 .

[0072] The first avoidance groove 61 has a first end that is an end portion on one side of the extension direction of the first avoidance groove 61 and a second end that is an end portion on the other side. The first end of the first avoidance groove 61 is closed. The second end of the first avoidance groove 61 is connected to the first avoidance recess 63. The first avoidance recess 63 is connected to the discharge chamber S2. The second avoidance groove 62 has a first end that is an end portion on one side of the extension direction of the second avoidance groove 62 and a second end that is an end portion on the other side. The first end of the second avoidance groove 62 is closed. The second end of the second avoidance groove 62 is connected to the second avoidance recess 64. The second avoidance recess 64 is connected to the discharge chamber S2.

[0073] <Sealing Area>

[0074] Of the pair of side edges along the extending direction of the first shunting groove 61, the side edge located on the side where the main discharge port 40 is provided is referred to as an opening edge 61a. Figure 7 As shown, when the substrate end surface 25e is viewed from above, the main reed valve 55 is located closer to the main discharge port 40 than the opening edge 61a of the first evacuation groove 61. The sealing area (the size of the contact area) of the main recess 42 sealed by the contact between the fixed substrate 25a and the main reed valve 55 is divided by the contact between the portion of the fixed substrate 25a closer to the main discharge port 40 than the first evacuation groove 61 and the main reed valve 55. Figure 7 In FIG. 1 , the portion where the fixed substrate 25a contacts the main reed valve 55 is indicated by dot hatching D1. The sealing area of ​​the main recess 42 sealed by the contact between the fixed substrate 25a and the main reed valve 55 is the area of ​​the dot hatching D1.

[0075] In the following description, one of the two auxiliary reed valves 57 is sometimes referred to as the first auxiliary reed valve 571, and the other is sometimes referred to as the second auxiliary reed valve 572. When the substrate end surface 25e is viewed in a planar manner, the first auxiliary reed valve 571 is located closer to the side where the auxiliary discharge port 41 is provided than the opening edge 61a of the first avoidance groove 61. Furthermore, the sealing area of ​​the auxiliary recess 43 sealed by the contact between the fixed substrate 25a and the first auxiliary reed valve 571 is divided by the contact between the portion of the fixed substrate 25a that is closer to the side where the auxiliary discharge port 41 is provided than the first avoidance groove 61 and the first auxiliary reed valve 571. In addition, in Figure 7 In FIG. 5 , the portion where the fixed substrate 25a contacts the first sub-reed valve 571 is indicated by dotted hatching D2. The sealing area where the sub-recess 43 is sealed by the contact between the fixed substrate 25a and the first sub-reed valve 571 is the area of ​​dotted hatching D2.

[0076] The side edge of the pair of side edges along the extension direction of the second avoidance groove 62, which is located on the side where the auxiliary discharge port 41 is provided, is referred to as the opening edge 62a. When the substrate end face 25e is viewed in a planar manner, the second auxiliary reed valve 572 is located closer to the side where the auxiliary discharge port 41 is provided than the opening edge 62a of the second avoidance groove 62. Furthermore, the sealing area of ​​the auxiliary recess 43 sealed by the contact between the fixed substrate 25a and the second auxiliary reed valve 572 is divided by the contact between the portion of the fixed substrate 25a which is closer to the side where the auxiliary discharge port 41 is provided than the second avoidance groove 62 and the second auxiliary reed valve 572. In addition, in Figure 7 In FIG. 1 , the portion where the fixed substrate 25a contacts the second sub-reed valve 572 is indicated by dotted hatching D3. The sealing area where the sub-recess 43 is sealed by the contact between the fixed substrate 25a and the second sub-reed valve 572 is the area of ​​dotted hatching D3.

[0077] Here, the opening area of ​​each sub-recess 43 is smaller than the opening area of ​​the main recess 42, and the area of ​​each sub-reed valve 57 is larger than the area of ​​the main reed valve 55. Consequently, the areas of the dotted shadows D2 and D3 are each larger than the area of ​​the dotted shadow D1. Consequently, the sealing area of ​​the corresponding sub-recess 43 sealed by the contact between the fixed base plate 25a and the first sub-reed valve 571, and the sealing area of ​​the corresponding sub-recess 43 sealed by the contact between the fixed base plate 25a and the second sub-reed valve 572, are both larger than the sealing area of ​​the main recess 42 sealed by the contact between the fixed base plate 25a and the main reed valve 55.

[0078] [Effects of Implementation Methods]

[0079] Next, the operation of this embodiment will be described.

[0080] The refrigerant gas compressed in the compression chamber 27 and discharged from the main discharge port 40 is discharged into the discharge chamber S2 by pushing open the main reed valve 55 .

[0081] In addition, in such a scroll compressor 10, for example, when liquid refrigerant is sucked into the compression chamber 27, liquid compression may sometimes occur in the compression chamber 27. When liquid compression occurs in the compression chamber 27 in this way, the pressure in the compression chamber 27 becomes high. At this time, when the pressure in the compression chamber 27 becomes higher than the set pressure, the liquid refrigerant discharged from the auxiliary discharge port 41 is discharged to the discharge chamber S2 by pushing open the auxiliary reed valve 57. In this way, the auxiliary discharge port 41 discharges the liquid refrigerant in the compression chamber 27 when the pressure in the compression chamber 27 becomes higher than the set pressure. Thus, even if liquid refrigerant is sucked into the compression chamber 27, the liquid refrigerant is discharged from the auxiliary discharge port 41 before the pressure in the compression chamber 27 becomes abnormally high. Therefore, it is possible to avoid the pressure in the compression chamber 27 from becoming abnormally high.

[0082] The auxiliary reed valve 57 is positioned relative to the fixed base plate 25a so that the axis of the auxiliary recess 43 and the center of the imaginary circle C12 coincide with each other. Therefore, even if the axis of the auxiliary recess 43 is offset relative to the axis of the auxiliary discharge port 41, the pressure of the liquid refrigerant discharged from the auxiliary discharge port 41 is prevented from biasedly acting on the auxiliary reed valve 57. Consequently, rattling of the auxiliary reed valve 57 can be suppressed.

[0083] A portion of the first escape groove 61 overlaps with the main arm portion 54 and the first auxiliary arm portion 561. Therefore, the main arm portion 54 and the first auxiliary arm portion 561 can be prevented from adhering to the substrate end surface 25e. Furthermore, foreign matter present between the main arm portion 54 and the substrate end surface 25e flows into the first escape groove 61 together with the oil contained in the refrigerant gas. Furthermore, foreign matter present between the first auxiliary arm portion 561 and the substrate end surface 25e flows into the first escape groove 61 together with the oil contained in the refrigerant gas. The oil that has flowed into the first escape groove 61 flows into the discharge chamber S2 via the first escape recess 63.

[0084] A portion of the second evacuation groove 62 overlaps with the second auxiliary arm portion 562. Therefore, the second auxiliary arm portion 562 is prevented from adhering to the substrate end surface 25e. Furthermore, foreign matter between the second auxiliary arm portion 562 and the substrate end surface 25e flows into the second evacuation groove 62 along with oil contained in the refrigerant gas. The oil that flows into the second evacuation groove 62 flows through the second evacuation recess 64 into the discharge chamber S2.

[0085] [Effects of the embodiment]

[0086] In the above-described embodiment, the following effects can be obtained.

[0087] (1) The sealing area of ​​the secondary recess 43 sealed by the contact between the fixed base plate 25a and the secondary reed valve 57 is larger than the sealing area of ​​the main recess 42 sealed by the contact between the fixed base plate 25a and the main reed valve 55. Thus, for example, compared to a case where the sealing area of ​​the secondary recess 43 sealed by the contact between the fixed base plate 25a and the secondary reed valve 57 is smaller than the sealing area of ​​the main recess 42 sealed by the contact between the fixed base plate 25a and the main reed valve 55, the sealing performance of the secondary recess 43 sealed by the contact between the fixed base plate 25a and the secondary reed valve 57 can be improved. Therefore, during normal operation of the scroll compressor 10, it is possible to easily avoid the problem of the secondary reed valve 57 opening due to pressure fluctuations within the compression chamber 27 even though the pressure within the compression chamber 27 has not reached the set pressure or above. Consequently, it is possible to suppress the leakage of refrigerant gas being compressed within the compression chamber 27 into the discharge chamber S2 through the secondary discharge port 41 even though the pressure within the compression chamber 27 has not reached the set pressure or above. As a result, the compression efficiency of the scroll compressor 10 can be improved.

[0088] (2) The opening area of ​​the auxiliary recess 43 is smaller than the opening area of ​​the main recess 42, and the area of ​​the auxiliary reed valve 57 is larger than the area of ​​the main reed valve 55. Such a configuration is preferably configured such that the sealing area of ​​the auxiliary recess 43 due to the contact between the fixed base plate 25a and the auxiliary reed valve 57 is larger than the sealing area of ​​the main recess 42 due to the contact between the fixed base plate 25a and the main reed valve 55.

[0089] (3) The sealing area for sealing the main recess 42 by contact between the fixed base plate 25a and the main reed valve 55 is divided by the contact between the portion of the fixed base plate 25a on the side where the main discharge port 40 is provided, relative to the first evacuation groove 61, and the main reed valve 55. Thus, the sealing of the main recess 42 by contact between the fixed base plate 25a and the main reed valve 55 can be appropriately performed by the contact between the portion of the fixed base plate 25a on the side where the main discharge port 40 is provided, relative to the first evacuation groove 61, and the main reed valve 55.

[0090] (4) The sealing area of ​​the corresponding secondary recess 43 sealed by the contact between the fixed substrate 25a and the first secondary reed valve 571 is divided by the contact between the first secondary reed valve 571 and the portion of the fixed substrate 25a on the side where the secondary discharge port 41 is provided, relative to the first evacuation groove 61. Furthermore, the sealing area of ​​the corresponding secondary recess 43 sealed by the contact between the fixed substrate 25a and the second secondary reed valve 572 is divided by the contact between the second secondary reed valve 572 and the portion of the fixed substrate 25a on the side where the secondary discharge port 41 is provided, relative to the second evacuation groove 62. Thus, the sealing of the secondary recess 43 by the contact between the fixed substrate 25a and the first secondary reed valve 571 can be appropriately performed. Furthermore, the secondary recess 43 can be appropriately sealed by the contact between the second secondary reed valve 572 and the portion of the fixed base plate 25a closer to the secondary discharge port 41 than the second shunting groove 62 .

[0091] [Change Example]

[0092] The above-mentioned embodiment can be implemented by modification as follows: The above-mentioned embodiment and the following modification examples can be implemented by combining with each other within the scope of no technical contradiction.

[0093] In the embodiment, the first escape groove 61 may extend obliquely relative to the extension direction of the main arm portion 54 and the extension direction of the first auxiliary arm portion 561. In short, the extension direction of the first escape groove 61 only needs to intersect the extension direction of the main arm portion 54 and the extension direction of the first auxiliary arm portion 561.

[0094] In the embodiment, the second escape groove 62 may extend obliquely with respect to the extending direction of the second sub-arm portion 562. In short, it is sufficient that the extending direction of the second escape groove 62 intersects with the extending direction of the second sub-arm portion 562.

[0095] In the embodiment, a portion of the first avoidance groove 61 may overlap only the main arm portion 54. In this case, a concave sub-groove that intersects the extending direction of the first sub-arm portion 561 and does not contact the first sub-arm portion 561 may be newly provided on the fixed base plate 25a.

[0096] In the embodiment, the first shunting groove 61 may not be formed in the fixed base plate 25 a.

[0097] In the embodiment, the second escape groove 62 may not be formed in the fixed base plate 25 a.

[0098] In the embodiment, the main reed valve 55 and the two sub-reed valves 57 may be provided on the fixed base plate 25 a as separate components (independent components).

[0099] In the embodiment, the number of the auxiliary discharge ports 41 is not particularly limited, and may be, for example, one, or three or more.

[0100] In the embodiment, the axis of the auxiliary recess 43 may coincide with the axis of the auxiliary discharge port 41 .

[0101] In the embodiment, the main reed valve 55 is substantially disc-shaped, but the shape of the main reed valve 55 is not particularly limited.

[0102] In the embodiment, the sub-reed valve 57 is substantially disc-shaped, but the shape of the sub-reed valve 57 is not particularly limited.

[0103] In the embodiment, the scroll compressor 10 may not be driven by the motor 22 , but may be driven by a vehicle engine, for example.

[0104] In the embodiment, the scroll compressor 10 is used in a vehicle air conditioner, but the invention is not limited thereto. For example, the scroll compressor 10 may be a compressor mounted on a fuel cell vehicle to compress air as a fluid supplied to a fuel cell.

Claims

1. A scroll compressor comprising: a housing having a housing suction port for sucking in fluid and a housing discharge port for discharging fluid; a rotating shaft housed in the housing and supported by the housing so as to be rotatable about an axis of the rotating shaft; as well as a compression mechanism housed in the housing and comprising a fixed scroll fixed to the housing and an orbiting scroll configured to revolve around the axis as the rotating shaft rotates; The housing is divided into: a suction chamber for sucking fluid from the suction port of the housing; a compression chamber that communicates with the suction chamber and compresses fluid through engagement of the fixed scroll and the orbiting scroll; as well as a discharge chamber capable of communicating with the compression chamber and discharging fluid from the compression chamber, The fixed scroll has a disk-shaped fixed base plate and a spiral-shaped fixed scroll wall rising from the fixed base plate. The orbiting scroll includes a disk-shaped orbiting base plate facing the fixed base plate, and a spiral-shaped orbiting scroll wall rising from the orbiting base plate toward the fixed base plate. A main discharge port for discharging the compressed fluid into the discharge chamber is formed at the center of the fixed base plate. A secondary discharge port is formed at a position different from the main discharge port in the fixed base plate, for discharging the fluid in the compression chamber to the discharge chamber when the pressure in the compression chamber becomes equal to or higher than a set pressure. The fixed base plate is provided with a plate-shaped main reed valve configured to open and close the main discharge port, and a plate-shaped sub-reed valve configured to open and close the sub-discharge port. The main discharge port is formed with a main recessed portion that opens toward the main reed valve so as to increase the cross-sectional area of ​​the flow path of the fluid discharged toward the main reed valve. The auxiliary discharge port is provided with an auxiliary recessed portion that opens toward the auxiliary reed valve so as to increase the cross-sectional area of ​​the flow path of the fluid discharged toward the auxiliary reed valve. A sealing area for sealing the auxiliary recess by contact between the fixed base plate and the auxiliary reed valve is larger than a sealing area for sealing the main recess by contact between the fixed base plate and the main reed valve.

2. The scroll compressor according to claim 1, The opening area of ​​the secondary recess is smaller than the opening area of ​​the main recess. The area of ​​the auxiliary reed valve is larger than the area of ​​the main reed valve.

3. The scroll compressor according to claim 1 or 2, An arm-shaped main arm portion is provided between the main reed valve and the fixed base plate to connect the two. The fixed base plate is provided with a concave main groove that intersects with the extending direction of the main arm portion and does not contact the main arm portion. A sealing area for sealing the main recess by contact between the fixed base plate and the main reed valve is divided by contact between a portion of the fixed base plate located closer to the main outlet than the main groove and the main reed valve.

4. The scroll compressor according to claim 1 or 2, An arm-shaped auxiliary arm portion is provided between the auxiliary reed valve and the fixed base plate to connect the two. The fixed base plate is provided with a concave auxiliary groove that intersects with the extending direction of the auxiliary arm portion and does not contact the auxiliary arm portion. The sealing area for sealing the sub-reed portion by the contact between the fixed base plate and the sub-reed valve is divided by the contact between the sub-reed valve and a portion of the fixed base plate closer to the sub-discharge port than the sub-groove.

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