Scroll compressor

Abstract

To improve compression efficiency of a scroll compressor.SOLUTION: A sealing area of a sub recess part 43 sealed by contact between a fixed substrate 25a and a sub lead valve 57 is larger than a sealing area of a main recess part 42 sealed by contact between the fixed substrate 25a and a main lead valve 55. According to this configuration, the sealing performance of the sub recess part 43 sealed by contact between the fixed substrate 25a and the sub lead valve 57 is improved compared to, for example, a case where the sealing area of the sub recess part 43 sealed by contact between the fixed substrate 25a and the sub lead valve 57 is equal to or smaller than the sealing area of the main recess part 42 sealed by contact between the fixed substrate 25a and the main lead valve 55.SELECTED DRAWING: Figure 7

Description

[Technical Field]

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

[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 a fluid. The housing discharge port discharges the fluid. The rotating shaft is housed within the housing. The rotating shaft is supported by the housing so as to be rotatable about the rotation axis. The compression mechanism is housed within the housing. The compression mechanism has a fixed scroll and an orbiting scroll. The fixed scroll is fixed to the housing. The orbiting scroll revolves as the rotating shaft rotates.

[0003] The housing is defined by a suction chamber, a compression chamber, and a discharge chamber. Fluid is drawn into the suction chamber through a housing suction port. The compression chamber is connected to the suction chamber. The compression chamber compresses the fluid by meshing between the fixed scroll and the orbiting scroll. The discharge chamber can be connected to the compression chamber. Fluid discharged from the compression chamber is discharged into the discharge chamber.

[0004] The fixed scroll has a disk-shaped fixed base plate and a spiral-shaped fixed spiral wall. The fixed spiral wall stands upright from the fixed base plate. The orbiting scroll has a disk-shaped orbiting base plate and a spiral-shaped orbiting spiral wall. The orbiting base plate faces the fixed base plate. The orbiting spiral wall stands upright from the orbiting base plate toward the fixed base plate. A main discharge port is formed in the center of the fixed base plate. The main discharge port discharges compressed fluid into the 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 may result in an abnormally high pressure within the compression chamber. Such overcompression within the compression chamber may cause problems, such as deformation of the fixed and orbiting volute walls, thereby reducing the reliability of the scroll compressor.

[0006] Therefore, a scroll compressor equipped with a sub-discharge port is known, as disclosed in Patent Document 1, for example. In the scroll compressor of Patent Document 1, the sub-discharge port discharges the fluid in the compression chamber when the pressure in the compression chamber reaches or exceeds a set pressure. With this, even if liquefied fluid is drawn into the compression chamber, the liquefied fluid is discharged from the sub-discharge port before the pressure in the compression chamber reaches an abnormally high pressure. This prevents the pressure in the compression chamber from becoming abnormally high. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 61-223288 Summary of the Invention [Problem to be solved by the invention]

[0008] When such a sub-discharge port is formed in a different location from the main discharge port on the fixed base plate, the scroll compressor has a plate-shaped main reed valve and a plate-shaped sub-reed valve 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, the sub-reed valve may open due to pressure fluctuations in the compression chamber even when the pressure in the compression chamber has not reached or exceeded the set pressure. This may cause fluid being compressed in the compression chamber to leak into the discharge chamber through the sub-discharge port, resulting in a deterioration in the compression efficiency of the scroll compressor. [Means for solving the problem]

[0009] A scroll-type compressor that solves the above-mentioned problems includes a housing having a housing suction port for sucking in a fluid and a housing discharge port for discharging the fluid, a rotating shaft accommodated in the housing and supported by the housing so as to be rotatable about a rotation axis, a fixed scroll accommodated in the housing and fixed to the housing, and a compression mechanism having an orbiting scroll that revolves with rotation of the rotating shaft, wherein the housing is defined with a suction chamber into which the fluid is sucked from the housing suction port, a compression chamber that communicates with the suction chamber and compresses the fluid by meshing of the fixed scroll with the orbiting scroll, and a discharge chamber that can communicate with the compression chamber and into which the fluid discharged from the compression chamber is discharged, the fixed scroll having a disk-shaped fixed base plate and a spiral-shaped fixed spiral wall that stands up from the fixed base plate, and the orbiting scroll having a disk-shaped orbiting base plate facing the fixed base plate and a spiral-shaped orbiting spiral wall that stands up from the orbiting base plate toward the fixed base plate, a main discharge port that discharges compressed fluid into the discharge chamber is formed in the center of the substrate, and a sub-discharge port that discharges fluid in the compression chamber into the discharge chamber when the pressure in the compression chamber reaches or exceeds a set pressure is formed in a portion of the fixed substrate different from the main discharge port, and a plate-shaped main reed valve that opens and closes the main discharge port and a plate-shaped sub-reed valve that opens and closes the sub-discharge port are provided on the fixed substrate, wherein the main discharge port is formed with a main recess that opens toward the main reed valve so that a cross-sectional area of ​​a flow path for fluid discharged toward the main reed valve is increased, and the sub-discharge port is formed with a sub-reed valve that opens toward the sub-reed valve so that a cross-sectional area of ​​a flow path for fluid discharged toward the sub-reed valve is increased, and a sealing area for sealing the sub-reed valve 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.

[0010] This improves the sealing performance of the sub-reed valve by contact with the fixed base plate compared to a case where the sealing area of ​​the sub-reed valve by contact with the fixed base plate is equal to or smaller than the sealing area of ​​the main reed valve by contact with the fixed base plate. This helps prevent the sub-reed valve from opening due to pressure fluctuations in the compression chamber even when the pressure in the compression chamber is not equal to or higher than the set pressure during normal operation of the scroll compressor. This prevents fluid being compressed in the compression chamber from leaking into the discharge chamber through the sub-discharge port even when the pressure in the compression chamber is not equal to or higher than the set pressure. As a result, the compression efficiency of the scroll compressor is improved.

[0011] In the scroll compressor, an opening area of ​​the sub-recess may be smaller than an opening area of ​​the main recess, and an area of ​​the sub-reed valve may be larger than an area of ​​the main reed valve.

[0012] This configuration is suitable as a configuration in which the sealing area for sealing the sub-reed valve by contact between the fixed base plate and the sub-reed valve is larger than the sealing area for sealing the main recess by contact between the fixed base plate and the main reed valve.

[0013] In the above scroll compressor, an arm-shaped main arm portion is provided between the main reed valve and the fixed base plate to connect them, and a concave main groove is provided in the fixed base plate so as to intersect with the extending direction of the main arm portion and not contact the main arm portion, and a sealing area that seals the main recess by contact between the fixed base plate and the main reed valve is preferably defined by contact between the fixed base plate and the main reed valve on the main discharge port side of the main groove.

[0014] With this, the main recess can be suitably sealed by contact between the fixed base plate and the main reed valve on the main discharge port side of the main groove.

[0015] In the above scroll compressor, an arm-shaped sub-arm portion is provided between the sub-reed valve and the fixed base plate to connect them to each other, and the fixed base plate is provided with a concave sub-groove that intersects with the extension direction of the sub-arm portion and does not contact the sub-arm portion, and the sealing area that seals the sub-reed recess by contact between the fixed base plate and the sub-reed valve is preferably defined by the contact between the fixed base plate and the sub-reed valve on the sub-discharge port side of the sub-groove.

[0016] This allows the sub-reed valve to come into contact with the fixed substrate on the sub-discharge port side of the sub-groove, thereby suitably sealing the sub-recess due to contact between the fixed substrate and the sub-reed valve. [Effects of the Invention]

[0017] According to the present invention, the compression efficiency of the scroll compressor can be improved. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a cross-sectional view showing a scroll compressor according to an embodiment. [Figure 2] FIG. 2 is a perspective view of the fixed scroll. [Figure 3] FIG. 3 is a perspective view showing the fixed scroll and the valve mechanism. [Figure 4] FIG. 4 is an enlarged perspective view of a portion of the fixed scroll. [Figure 5] FIG. 5 is an enlarged plan view showing a part of the fixed scroll. [Figure 6] FIG. 6 is a plan view showing the fixed scroll and the reed valve. [Figure 7]FIG. 7 is an enlarged plan view showing a portion of the fixed scroll and the reed valve. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of a scroll compressor will be described below with reference to Figures 1 to 7. The scroll compressor of this embodiment is used, for example, in a vehicle air conditioner. <Basic configuration of a scroll compressor> As shown in FIG. 1 , the scroll compressor 10 includes a cylindrical housing 11. The housing 11 has a motor housing 12, a support housing 13, and a discharge housing 14. The motor housing 12, the support housing 13, and the discharge housing 14 are made of a metal material. The motor housing 12, the support housing 13, and the discharge housing 14 are made of aluminum, for example. The scroll compressor 10 also includes a rotating shaft 15. The rotating shaft 15 is accommodated in the housing 11.

[0020] The motor housing 12 has a plate-shaped end wall 12a and a cylindrical peripheral wall 12b. The peripheral wall 12b extends cylindrically from the outer periphery of the end wall 12a. The axial direction of the peripheral wall 12b coincides with the axial direction of the rotary shaft 15. The motor housing 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 closer to the end wall 12a. The housing suction port 12h communicates between the inside and outside of the motor housing 12. The housing suction port 12h draws in refrigerant gas as a fluid.

[0021] The motor housing 12 has a cylindrical boss portion 12d. The boss portion 12d protrudes from the inner surface of the end wall 12a. A first end portion, which is one axial end portion of the rotary shaft 15, is inserted into the boss portion 12d. The scroll compressor 10 is provided with 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 rotary shaft 15. The first end portion of the rotary shaft 15 is rotatably supported by the motor housing 12 via the rolling bearing 16.

[0022] The journal housing 13 has a disk-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 rotary shaft 15. The journal housing 13 has an annular flange wall 19. The flange wall 19 extends radially outward from the rotary shaft 15 from an end of the outer periphery of the peripheral wall 18 opposite the end wall 17. The outer periphery of the flange wall 19 contacts the open end of the peripheral wall 12b of the motor housing 12.

[0023] The support housing 13 has an insertion hole 17a. The insertion hole 17a is formed in the center of the end wall 17. The insertion hole 17a penetrates the end wall 17 in the thickness direction. The rotary shaft 15 is inserted through the insertion hole 17a. An end face 15e located on the second end side, which is the other end in the axial direction of the rotary shaft 15, is located inside the peripheral wall 18. The scroll compressor 10 is provided with 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 rotary shaft 15. The rotary shaft 15 is rotatably supported by the support housing 13 via the rolling bearing 21. In this way, the rotary shaft 15 is supported by the housing 11 so as to be rotatable about the rotation axis.

[0024] The housing 11 has a motor chamber S1. The motor chamber S1 is defined by the motor housing 12 and the support housing 13. The motor chamber S1 is connected to the housing suction port 12h. Refrigerant gas is drawn into the motor chamber S1 from the housing suction port 12h. Therefore, the motor chamber S1 is a suction chamber into which refrigerant gas is drawn from the housing suction port 12h. In this way, a suction chamber is defined within the housing 11.

[0025] The scroll compressor 10 includes a motor 22. The motor 22 is housed in a motor chamber S1. The motor 22 has 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) provided on the rotor core 24a. The stator 23 has 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 12. The coil 23b is wound around the stator core 23a. The rotor 24 rotates when power controlled by an inverter (not shown) is supplied to the coil 23b. As a result, the rotating shaft 15 rotates integrally with the rotor 24.

[0026] 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 disk-shaped fixed base plate 25a and a spiral-shaped fixed spiral wall 25b. The fixed spiral wall 25b stands upright from the fixed base plate 25a. The fixed scroll 25 includes a fixed outer peripheral wall 25c. The fixed outer peripheral wall 25c stands upright in a cylindrical shape from the outer periphery of the fixed base plate 25a. The fixed outer peripheral wall 25c surrounds the fixed spiral wall 25b. An open end face of the fixed outer peripheral wall 25c is located on the opposite side of the fixed base plate 25a from the tip end face of the fixed spiral wall 25b.

[0027] The orbiting scroll 26 has a disk-shaped orbiting base plate 26a and a spiral-shaped orbiting spiral wall 26b. The orbiting base plate 26a faces the fixed base plate 25a. The orbiting spiral wall 26b rises from the orbiting base plate 26a toward the fixed base plate 25a. The orbiting spiral wall 26b meshes with the fixed spiral wall 25b. The orbiting spiral wall 26b is located inside the fixed outer peripheral wall 25c. The tip surface of the fixed spiral wall 25b contacts the orbiting base plate 26a. The tip surface of the orbiting spiral wall 26b contacts the fixed base plate 25a. A plurality of compression chambers 27 are defined by the fixed base plate 25a, the fixed spiral wall 25b, the orbiting base plate 26a, and the orbiting spiral wall 26b. Therefore, a plurality of compression chambers 27 are defined by the fixed scroll 25 and the orbiting scroll 26. Each compression chamber 27 compresses refrigerant gas. In this manner, the compression chambers 27 that compress refrigerant gas are defined by the meshing of the fixed scroll 25 and the orbiting scroll 26. Therefore, the compression chambers 27 are defined within the housing 11.

[0028] The orbiting scroll 26 has a cylindrical boss portion 26c. The boss portion 26c protrudes from the center of an end face 26e of the orbiting base plate 26a, which is on the opposite side from the fixed base plate 25a. The axial direction of the boss portion 26c coincides with the axial direction of the rotary shaft 15.

[0029] The orbiting scroll 26 has a plurality of recesses 26d. The recesses 26d are formed around the boss portion 26c on the end face 26e of the orbiting base plate 26a. The recesses 26d are arranged at predetermined intervals in the circumferential direction of the rotary shaft 15. For convenience of explanation, only one recess 26d is shown in FIG. 1. An annular ring member 28 is fitted into each recess 26d. The scroll compressor 10 has a plurality of pins 29. Each pin 29 is provided in the support housing 13. Each pin 29 protrudes from the end face 13e of the support housing 13 on the orbiting scroll 26 side. Each pin 29 is inserted into each ring member 28.

[0030] The scroll compressor 10 includes an eccentric shaft 31. The eccentric shaft 31 protrudes toward the orbiting scroll 26 from a portion of the end face 15e of the rotary shaft 15 that is eccentric with respect to the axis L1 of the rotary shaft 15. The eccentric shaft 31 is formed integrally with the rotary shaft 15. The axial direction of the eccentric shaft 31 coincides with the axial direction of the rotary shaft 15. The eccentric shaft 31 is inserted into the boss portion 26c.

[0031] The scroll compressor 10 includes a balance weight 32 and a bush 33. The balance weight 32 is integrated with the bush 33. The bush 33 is fitted onto the outer peripheral surface of the eccentric shaft 31. The balance weight 32 is formed integrally with the bush 33. The balance weight 32 is housed within the peripheral wall 18 of the support housing 13. The orbiting scroll 26 is supported by the eccentric shaft 31 via the bush 33 and a rolling bearing 34 so as to be rotatable relative to the eccentric shaft 31.

[0032] The rotation of the rotary shaft 15 is transmitted to the orbiting scroll 26 via the eccentric shaft 31, the bushing 33, and the rolling bearing 34, causing the orbiting scroll 26 to rotate on its axis. Contact between each pin 29 and the inner circumferential surface of each ring member 28 prevents the orbiting scroll 26 from rotating on its axis, allowing only the orbiting scroll 26 to revolve. As a result, the orbiting scroll 26 revolves while the orbiting spiral wall 26b is in contact with the fixed spiral wall 25b, reducing the volume of the compression chamber 27 and compressing the refrigerant gas. Therefore, the orbiting scroll 26 revolves due to the rotation of the rotary shaft 15. The balance weight 32 offsets the centrifugal force acting on the orbiting scroll 26 as it revolves, thereby reducing the amount of imbalance in the orbiting scroll 26.

[0033] The discharge housing 14 has 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 rotary 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 accommodated in the housing 11. In this manner, the compression mechanism C1 is accommodated in the housing 11.

[0034] The discharge housing 14, the support housing 13, and the motor housing 12 are fixed together by bolts B1. The bolts B1 pass through the peripheral wall 14b of the discharge housing 14 and the outer periphery of the flange wall 19, and are screwed into the peripheral wall 12b of the motor housing 12. This connects the support housing 13 to the peripheral wall 12b of the motor housing 12, and connects the discharge housing 14 to the flange wall 19 of the support housing 13. Therefore, the motor housing 12, the support housing 13, and the discharge housing 14 are arranged side by side in this order in the axial direction of the rotating shaft 15.

[0035] The fixed scroll 25 is sandwiched between the end wall 14a of the discharge housing 14 and the support housing 13. In this manner, the fixed scroll 25 is fixed to the housing 11.

[0036] The scroll compressor 10 includes a discharge chamber S2. The discharge chamber S2 is formed within the discharge housing 14. The discharge chamber S2 is defined by the discharge housing 14 and the fixed base plate 25a of the fixed scroll 25. In this manner, the discharge chamber S2 is defined within the housing 11. Refrigerant gas discharged from the compression chamber 27 is discharged into the discharge chamber S2.

[0037] The discharge housing 14 has a housing discharge port 14h. Therefore, the housing 11 has a housing discharge port 14h. The housing discharge port 14h is formed in the end wall 14a of the discharge housing 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.

[0038] The housing discharge port 14h and the housing suction port 12h are connected by an external refrigerant circuit 20. The external refrigerant circuit 20 has a condenser, an expansion valve, and an evaporator, all of which are 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 returns to 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.

[0039] 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 circumferential surface of the peripheral wall 12b of the motor housing 12. Each first groove 35 opens to an open end of the peripheral wall 12b. A plurality of first holes 36 are formed on the outer circumferential portion of the flange wall 19 of the journal housing 13. Each first hole 36 penetrates the flange wall 19 in the thickness direction. Each first hole 36 is connected to a corresponding one of the first grooves 35. A plurality of second grooves 37 are formed on the inner circumferential surface of the peripheral wall 14b of the discharge housing 14. Each second groove 37 is connected to a corresponding one of the first holes 36. Note that, for convenience of illustration, FIG. 1 shows only one each of the first groove 35, the first hole 36, and the second groove 37.

[0040] The second holes 38 are formed in the fixed outer peripheral wall 25c of the fixed scroll 25. The second holes 38 penetrate the fixed outer peripheral wall 25c in the thickness direction. The second holes 38 are connected to the second grooves 37. The second holes 38 are connected to the outermost peripheral portions of the compression chambers 27. In this manner, the compression chambers 27 are connected to the motor chamber S1 via the first grooves 35, the first holes 36, the second grooves 37, and the second holes 38. Refrigerant gas in the motor chamber S1 passes through the first grooves 35, the first holes 36, the second grooves 37, and the second holes 38 and is drawn into the compression chambers 27. The refrigerant gas drawn into the compression chambers 27 is compressed in the compression chambers 27 by the orbital motion of the orbiting scroll 26.

[0041] <Main discharge port> As shown in FIGS. 1 and 2, a main discharge port 40 is formed in the center of the fixed base plate 25a. The main discharge port 40 is a circular hole. The main discharge port 40 penetrates the fixed base plate 25a in the thickness direction. A first end of the main discharge port 40 communicates with the compression chamber 27. A second end of the main discharge port 40 communicates with the discharge chamber S2. Therefore, the discharge chamber S2 can communicate with the compression chamber 27 via the main discharge port 40. The main discharge port 40 discharges the refrigerant gas compressed in the compression chamber 27 to the discharge chamber S2.

[0042] <Sub-discharge port> As shown in Figures 2 and 3, a sub-discharge port 41 is formed in a location on the fixed substrate 25a different from the main discharge port 40. Two sub-discharge ports 41 are formed in the fixed substrate 25a. The two sub-discharge ports 41 are arranged so as to sandwich the main discharge port 40. Each sub-discharge port 41 has a circular hole shape. Each sub-discharge port 41 penetrates the fixed substrate 25a in the thickness direction. The hole diameter of each sub-discharge port 41 is smaller than the hole diameter of the main discharge port 40.

[0043] 1, a first end of each sub-discharge port 41 is connected to a compression chamber 27. A second end of each sub-discharge port 41 is connected to a discharge chamber S2. When the pressure in the compression chamber 27 reaches or exceeds a set pressure, each sub-discharge port 41 discharges the refrigerant gas in the compression chamber 27 into the discharge chamber S2.

[0044] <Main recess> As shown in Figures 4 and 5, a main recess 42 is formed in the main discharge port 40. The main recess 42 opens to a substrate end surface 25e, which is the surface of the fixed substrate 25a located opposite to the fixed spiral wall 25b. The main recess 42 is a circular hole. The hole diameter of the main recess 42 is larger than the hole diameter of the main discharge port 40. The main discharge port 40 opens to a bottom surface 42a of the main recess 42. The axis of the main recess 42 and the axis of the main discharge port 40 coincide with each other.

[0045] <Sub-recess> A sub-recess 43 is formed in each sub-discharge port 41. Each sub-recess 43 opens to the substrate end surface 25e of the fixed substrate 25a. Each sub-recess 43 is circular. The hole diameter of each sub-recess 43 is larger than the hole diameter of each sub-discharge port 41. Each sub-discharge port 41 opens to the bottom surface 43a of each sub-recess 43. The axis of each sub-recess 43 is offset from the axis of each sub-discharge port 41. The hole diameter of each sub-recess 43 is smaller than the hole diameter of the main recess 42. Therefore, the opening area of ​​each sub-recess 43 is smaller than the opening area of ​​the main recess 42.

[0046] <Reed valve> 3, the scroll compressor 10 includes a valve mechanism 50. The valve mechanism 50 is provided on the substrate end surface 25e of the fixed substrate 25a. The valve mechanism 50 includes a reed valve 51 and a retainer 52.

[0047] As shown in Figures 6 and 7, the reed valve 51 is in the shape of an elastically deformable thin plate. The reed valve 51 is a metal plate. The reed valve 51 has a fixed portion 53, a main arm portion 54, a main reed valve 55, a sub-arm portion 56, and a sub-reed valve 57. The reed valve 51 has two sub-arm portions 56 and two sub-reed valves 57. The fixed portion 53, the main arm portion 54, the main reed valve 55, the two sub-arm portions 56, and the two sub-reed valves 57 are integrally formed from a single metal plate.

[0048] The fixed portion 53 is an elongated, generally rectangular plate. The fixed portion 53 is a portion that is fixed to the substrate end surface 25e of the fixed substrate 25a of the reed valve 51. The fixed portion 53 is fixed to the substrate end surface 25e with the thickness direction of the fixed portion 53 coinciding with the thickness direction of the fixed substrate 25a.

[0049] The main arm portion 54 and each sub-arm portion 56 are shaped like a long, narrow rectangular plate. The main arm portion 54 and each sub-arm portion 56 extend from the fixed portion 53 with their respective longitudinal directions aligned. The thickness direction of the main arm portion 54 and the thickness direction of each sub-arm portion 56 are aligned with the thickness direction of the fixed portion 53. The main arm portion 54 extends from a central portion of the fixed portion 53 in the longitudinal direction. Each sub-arm portion 56 extends from a portion of the fixed portion 53 located on either side of the main arm portion 54 in the longitudinal direction. The longitudinal directions of the main arm portion 54 and each sub-arm portion 56 are perpendicular to the longitudinal direction of the fixed portion 53. The main arm portion 54 extends from the fixed portion 53 toward the main discharge port 40. Each sub-arm portion 56 extends from the fixed portion 53 toward each sub-discharge port 41.

[0050] The main reed valve 55 is continuous with the end of the main arm portion 54 opposite to the fixed portion 53. The main reed valve 55 has a substantially circular plate shape. The main reed valve 55 is configured to be able to close the main recess 42.

[0051] 7, the main reed valve 55 has an outer edge 55a and a pair of connecting edges 55b. The outer edge 55a is an 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 opening edge of the main recess 42. The connecting edges 55b are outer edges of the main reed valve 55 that connect the outer edge 55a to the outer edge of the main arm portion 54.

[0052] The main reed valve 55 is disposed relative to the fixed base plate 25a so that the axis of the main recess 42 and the center of an imaginary circle C11 passing through the outer edge 55a coincide with each other. Therefore, when the main reed valve 55 closes the main recess 42, the outer periphery of the main reed valve 55 contacts the end surface 25e of the fixed base plate 25a. 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, the fixed base plate 25a is provided with a plate-shaped main reed valve 55 that opens and closes the main discharge port 40. The main recess 42 opens toward the main reed valve 55 so that the cross-sectional area of ​​the flow path for refrigerant gas discharged toward the main reed valve 55 is large.

[0053] Each sub-reed valve 57 is continuous with the end of each sub-arm portion 56 on the opposite side from the fixed portion 53. Each sub-reed valve 57 is generally disk-shaped. Each sub-reed valve 57 is configured to be able to close each sub-recess 43.

[0054] Each sub-reed valve 57 has an outer edge 57a and a pair of connecting edges 57b. The outer edge 57a is an outer edge of the sub-reed valve 57 that extends along the opening edge of the sub-recess 43 and has an outer diameter R2 that is slightly larger than the opening edge of the sub-recess 43. Each connecting edge 57b is an outer edge of the sub-reed valve 57 that connects the outer edge 57a to the outer edge of the sub-arm portion 56.

[0055] Each sub-reed valve 57 is disposed relative to the fixed base plate 25a so that the axis of the corresponding sub-reed recess 43 and the center of an imaginary circle C12 passing through the outer edge 57a are aligned. Therefore, when each sub-reed valve 57 closes its corresponding sub-reed recess 43, the outer periphery of the sub-reed valve 57 contacts the end surface 25e of the fixed base plate 25a. Each sub-reed valve 57 seals its corresponding sub-reed recess 43 through contact between the fixed base plate 25a and the sub-reed valve 57. Each sub-reed valve 57 can open and close a corresponding sub-discharge port 41. Therefore, the fixed base plate 25a is provided with a plate-shaped sub-reed valve 57 that opens and closes each sub-discharge port 41. Each sub-reed recess 43 opens toward the corresponding sub-reed valve 57 so that the cross-sectional area of ​​the flow path for refrigerant gas discharged toward the sub-reed valve 57 is large.

[0056] An outer diameter R2 of the outer edge 57a of each sub-reed valve 57 is larger than an outer diameter R1 of the outer edge 55a of the main reed valve 55. Therefore, the area of ​​each sub-reed valve 57 is larger than the area of ​​the main reed valve 55.

[0057] 3, the retainer 52 is in the form of a plate that is thicker than the reed valve 51. The retainer 52 and the reed valve 51 are attached to the fixed base plate 25a by a bolt B2 that passes through the fixing portion 53 of the retainer 52 and the reed valve 51 and is screwed into the fixed base plate 25a.

[0058] The main reed valve 55 is connected to the fixed substrate 25a via the main arm portion 54 and the fixed portion 53. Therefore, the arm-shaped main arm portion 54 is provided between the main reed valve 55 and the fixed substrate 25a to connect them to each other. Each sub-reed valve 57 is connected to the fixed substrate 25a via each sub-arm portion 56 and the fixed portion 53. Therefore, each sub-reed valve 57 is provided between the fixed substrate 25a and the fixed substrate 25a to connect them to each other.

[0059] The retainer 52 is warped so as to gradually move away from the fixed base plate 25a from the fixed portion 53 toward the tips of the main reed valve 55 and each sub-reed valve 57. This allows the main reed valve 55 to swing integrally with the main arm portion 54 in a direction toward and away from the fixed base plate 25a, with a portion of the main arm portion 54 on the fixed portion 53 side as a base point. Also, each sub-reed valve 57 can swing integrally with each sub-arm portion 56 in a direction toward and away from the fixed base plate 25a, with a portion of the sub-arm portion 56 on the fixed portion 53 side as a base point.

[0060] The main reed valve 55 opens the main recess 42 by swinging in a direction away from the fixed base plate 25a from a state in which the main reed valve 55 closes the main recess 42. Furthermore, each sub-reed valve 57 opens each sub-recess 43 by swinging in a direction away from the fixed base plate 25a from a state in which the sub-reed valve 57 closes each sub-recess 43. The retainer 52 adjusts the opening degree of the main reed valve 55 and each sub-reed valve 57.

[0061] <Main groove and sub-groove> As shown in FIGS. 6 and 7 , a first relief groove 61, a second relief groove 62, a first relief recess 63, and a second relief recess 64 are formed on the substrate end surface 25e of the fixed substrate 25a. The first relief groove 61 extends in a direction perpendicular to the extension direction of the main arm portion 54 and the extension direction of one of the two sub-arm portions 56. When the substrate end surface 25e is viewed in a plan view, the first relief groove 61 partially overlaps with the main arm portion 54 and one of the two sub-arm portions 56. Therefore, the main arm portion 54 and one of the two sub-arm portions 56 pass over the first relief groove 61. In this way, the first relief groove 61 is perpendicular to the extension direction of the main arm portion 54 and the extension direction of one of the two sub-arm portions 56, and does not come into contact with the main arm portion 54 or one of the two sub-arm portions 56.

[0062] Therefore, the first escape groove 61 functions as a concave main groove that intersects the extension direction of the main arm portion 54 and does not come into contact with the main arm portion 54. The first escape groove 61 also functions as a concave sub-groove that intersects the extension direction of one of the two sub-arm portions 56 and does not come into contact with one of the two sub-arm portions 56. In this way, the fixed substrate 25a is provided with a concave main groove that intersects the extension direction of the main arm portion 54 and does not come into contact with the main arm portion 54. The fixed substrate 25a is also provided with a concave sub-groove that intersects the extension direction of one of the two sub-arm portions 56 and does not come into contact with the sub-arm portion 56.

[0063] The second escape groove 62 extends in a direction perpendicular to the extension direction of the other of the two sub-arm portions 56. When the substrate end surface 25e is viewed in a plan view, the second escape groove 62 partially overlaps with the other of the two sub-arm portions 56. Therefore, the other of the two sub-arm portions 56 passes over the second escape groove 62. In this way, the second escape groove 62 is perpendicular to the extension direction of the other of the two sub-arm portions 56 and does not come into contact with the other of the two sub-arm portions 56.

[0064] Therefore, the second escape groove 62 functions as a concave sub-groove that intersects with the extension direction of the other of the two sub-arm portions 56 and does not come into contact with the other of the two sub-arm portions 56.

[0065] A first end of the first relief groove 61 is closed. A second end of the first relief groove 61 communicates with the first relief recess 63. The first relief recess 63 communicates with the discharge chamber S2. A first end of the second relief groove 62 is closed. A second end of the second relief groove 62 communicates with the second relief recess 64. The second relief recess 64 communicates with the discharge chamber S2.

[0066] <Seal area> As shown in Fig. 7, 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 relief groove 61 located on the main discharge port 40 side. The sealing area that seals the main recess 42 by contact between the fixed substrate 25a and the main reed valve 55 is defined by the contact between the fixed substrate 25a and the main reed valve 55 on the main discharge port 40 side of the first relief groove 61. In Fig. 7, the area where the fixed substrate 25a and the main reed valve 55 are in contact is indicated by dotted hatching D1. The sealing area that seals the main recess 42 by contact between the fixed substrate 25a and the main reed valve 55 is the area of ​​dotted hatching D1.

[0067] When the substrate end surface 25e is viewed from above, one of the two sub-reed valves 57 is located closer to the sub-discharge port 41 than the opening edge 61a of the first relief groove 61 that is located on the sub-discharge port 41 side. The sealing area that seals the sub-recess 43 by contact between the fixed substrate 25a and one of the two sub-reed valves 57 is defined by the contact between the fixed substrate 25a and the sub-reed valve 57 on the sub-discharge port 41 side of the first relief groove 61. In FIG. 7, the area where the fixed substrate 25a and one of the two sub-reed valves 57 are in contact is indicated by dotted hatching D2. The sealing area that seals the sub-recess 43 by contact between the fixed substrate 25a and one of the two sub-reed valves 57 is the area of ​​dotted hatching D2.

[0068] In a plan view of the substrate end surface 25e, the other of the two sub-reed valves 57 is located closer to the sub-discharge port 41 than the opening edge 62a of the second relief groove 62 located on the sub-discharge port 41 side. The sealing area that seals the sub-recess 43 by contact between the fixed substrate 25a and the other of the two sub-reed valves 57 is defined by the contact between the fixed substrate 25a and the sub-reed valve 57 on the sub-discharge port 41 side of the second relief groove 62. In FIG. 7, the area where the fixed substrate 25a and the other of the two sub-reed valves 57 contact each other is indicated by dotted hatching D3. The sealing area that seals the sub-recess 43 by contact between the fixed substrate 25a and the other of the two sub-reed valves 57 is the area of ​​dotted hatching D3.

[0069] Here, the opening area of ​​each sub-reed valve 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. As a result, the areas of dot hatching D2 and D3 are larger than the area of ​​dot hatching D1. Therefore, the sealing area for sealing each sub-reed valve 43 by contact between the fixed substrate 25a and each sub-reed valve 57 is larger than the sealing area for sealing the main recess 42 by contact between the fixed substrate 25a and the main reed valve 55.

[0070] [Operation of the embodiment] Next, the operation of this embodiment will be described. The refrigerant gas compressed in the compression chamber 27 and discharged from the main discharge port 40 pushes the main reed valve 55 aside, and is thereby discharged from the main discharge port 40 into the discharge chamber S2.

[0071] Furthermore, in such a scroll compressor 10, for example, when liquid refrigerant is drawn into the compression chamber 27, liquid compression may occur within the compression chamber 27. When liquid compression occurs within the compression chamber 27, the pressure within the compression chamber 27 increases. At this time, when the pressure within the compression chamber 27 reaches or exceeds a set pressure, the liquid refrigerant is discharged from each sub-discharge port 41 and pushes away each sub-reed valve 57, thereby being discharged from each sub-discharge port 41 into the discharge chamber S2. In this way, each sub-discharge port 41 discharges the liquid refrigerant within the compression chamber 27 when the pressure within the compression chamber 27 reaches or exceeds the set pressure. Accordingly, even if liquid refrigerant is drawn into the compression chamber 27, the liquid refrigerant is discharged from each sub-discharge port 41 before the pressure within the compression chamber 27 reaches an abnormally high pressure. This prevents the pressure within the compression chamber 27 from becoming abnormally high.

[0072] Each sub-reed valve 57 is disposed relative to the fixed base plate 25a so that the axis of each sub-recess 43 coincides with the center of an imaginary circle C12 passing through the outer edge 57a. Therefore, even if the axis of each sub-recess 43 is misaligned with the axis of each sub-discharge port 41, the pressure of the liquid refrigerant discharged from each sub-discharge port 41 is prevented from acting unevenly on each sub-reed valve 57. As a result, fluttering of each sub-reed valve 57 is prevented.

[0073] The first escape groove 61 partially overlaps with the main arm portion 54 and one of the two sub-arm portions 56. This prevents the main arm portion 54 and one of the two sub-arm portions 56 from sticking 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 one of the two sub-arm portions 56 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 flows into the first escape groove 61 flows into the discharge chamber S2 via the first escape recess 63.

[0074] The second escape groove 62 partially overlaps with the other of the two sub-arm portions 56. This prevents the other of the two sub-arm portions 56 from sticking to the substrate end surface 25e. Furthermore, foreign matter present between the other of the two sub-arm portions 56 and the substrate end surface 25e flows into the second escape groove 62 together with the oil contained in the refrigerant gas. The oil that flows into the second escape groove 62 flows into the discharge chamber S2 via the second escape recess 64.

[0075] [Effects of the embodiment] The above embodiment can provide the following effects. (1) The sealing area of ​​the sub-reed valve 57 that seals the sub-recess 43 due to contact between the fixed base plate 25a and the sub-reed valve 57 is larger than the sealing area of ​​the main recess 42 that seals the main recess 42 due to contact between the fixed base plate 25a and the main reed valve 55. This improves the sealing performance of the sub-recess 43 that seals the sub-recess 43 due to contact between the fixed base plate 25a and the sub-reed valve 57, compared to when the sealing area of ​​the sub-recess 43 that seals the sub-recess 43 due to contact between the fixed base plate 25a and the sub-reed valve 57 is smaller than the sealing area of ​​the main recess 42 that seals the main recess 42 due to contact between the fixed base plate 25a and the main reed valve 55. This makes it easier to avoid a problem in which the sub-reed valve 57 opens due to pressure fluctuations in the compression chamber 27 even when the pressure in the compression chamber 27 has not reached or exceeded the set pressure during normal operation of the scroll compressor 10. This prevents refrigerant gas being compressed in the compression chamber 27 from leaking into the discharge chamber S2 via the sub-discharge port 41 even when the pressure in the compression chamber 27 has not reached or exceeded the set pressure. As a result, the compression efficiency of the scroll compressor 10 can be improved.

[0076] (2) The opening area of ​​the sub-reed valve 43 is smaller than the opening area of ​​the main recess 42, and the area of ​​the sub-reed valve 57 is larger than the area of ​​the main reed valve 55. This configuration is suitable as a configuration in which the sealing area for sealing the sub-reed valve 43 by contact between the fixed base plate 25a and the sub-reed valve 57 is larger than the sealing area for sealing the main recess 42 by contact between the fixed base plate 25a and the main reed valve 55.

[0077] (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 defined by the contact between the fixed base plate 25a and the main reed valve 55 on the main discharge port 40 side of the first relief groove 61. This allows the main recess 42 to be suitably sealed by contact between the fixed base plate 25a and the main reed valve 55 on the main discharge port 40 side of the first relief groove 61.

[0078] (4) The sealing area where the sub-recess 43 is sealed by contact between the fixed base plate 25a and one of the two sub-reed valves 57 is defined by the contact between the fixed base plate 25a and the sub-reed valve 57 on the sub-discharge port 41 side of the first relief groove 61. Also, the sealing area where the sub-recess 43 is sealed by contact between the fixed base plate 25a and the sub-reed valve 57 on the sub-discharge port 41 side of the second relief groove 62. This allows the sub-recess 43 to be suitably sealed by contact between the fixed base plate 25a and one of the two sub-reed valves 57 on the sub-discharge port 41 side of the first relief groove 61. In addition, contact between the fixed substrate 25a and the other of the two sub-reed valves 57 on the sub-discharge port 41 side of the second escape groove 62 can suitably seal the sub-recess 43 by contact between the fixed substrate 25a and the other of the two sub-reed valves 57.

[0079] [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0080] In the embodiment, the first escape groove 61 may extend obliquely with respect to the extension direction of the main arm portion 54 and the extension direction of one of the two sub-arm portions 56. In short, it is only necessary that the first escape groove 61 intersects with the extension direction of the main arm portion 54 and the extension direction of one of the two sub-arm portions 56.

[0081] In the embodiment, the second escape groove 62 may extend obliquely with respect to the extension direction of the other of the two sub-arm portions 56. In short, it is only necessary that the second escape groove 62 intersects with the extension direction of the other of the two sub-arm portions 56.

[0082] In the embodiment, the first escape groove 61 may overlap only a portion of the main arm portion 54. In this case, a new concave sub-groove may be provided in the fixed substrate 25a that intersects with the extension direction of one of the two sub-arm portions 56 but does not come into contact with the sub-arm portion 56.

[0083] In the embodiment, the first relief groove 61 does not have to be formed in the fixed substrate 25a. In the embodiment, the second relief groove 62 does not have to be formed in the fixed substrate 25a.

[0084] In the above embodiment, the main reed valve 55 and each sub-reed valve 57 may be provided as separate members on the fixed substrate 25a. In the embodiment, the number of the sub-discharge ports 41 is not particularly limited. For example, the number may be one, or three or more.

[0085] In the embodiment, the axis of each sub-recess 43 may coincide with the axis of each sub-discharge port 41 . In the above embodiment, the main reed valve 55 has a substantially circular disk shape. However, the shape of the main reed valve 55 is not particularly limited.

[0086] In the above embodiment, each sub-reed valve 57 has a substantially circular disk shape. However, the shape of each sub-reed valve 57 is not particularly limited. In the above-described embodiment, the scroll compressor 10 does not have to be a type that is driven by the motor 22, but may be a type that is driven by, for example, a vehicle engine.

[0087] In the above embodiment, the scroll compressor 10 is used in a vehicle air conditioner, but the present invention is not limited to this. For example, the scroll compressor 10 may be installed in a fuel cell vehicle and compress air as a fluid to be supplied to the fuel cell.

[0088] [Note] The technical ideas that can be understood from the above-described embodiment and modifications will be described below. <Appendix 1> a housing having a housing intake port for intake of fluid and a housing discharge port for discharge of fluid; a rotating shaft accommodated in the housing and supported by the housing so as to be rotatable about a rotation axis; a compression mechanism that is accommodated in the housing and has a fixed scroll that is fixed to the housing and an orbiting scroll that revolves by rotation of the rotation shaft, The housing is defined within it a suction chamber into which fluid is drawn from the housing suction port, a compression chamber which communicates with the suction chamber and compresses the fluid by meshing of the fixed scroll and the orbiting scroll, and a discharge chamber which can communicate with the compression chamber and into which fluid discharged from the compression chamber is discharged, the fixed scroll has a disk-shaped fixed base plate and a spiral-shaped fixed spiral wall that stands up from the fixed base plate, The orbiting scroll has a disk-shaped orbiting base plate facing the fixed base plate, and an orbiting spiral wall that stands up from the orbiting base plate toward the fixed base plate and has a spiral shape, a main discharge port for discharging compressed fluid into the discharge chamber is formed at the center of the fixed substrate; a sub-discharge port is formed in a portion of the fixed substrate different from the main discharge port, and the sub-discharge port discharges the fluid in the compression chamber to the discharge chamber when the pressure in the compression chamber reaches or exceeds a set pressure; a plate-shaped main reed valve that opens and closes the main discharge port, and a plate-shaped sub-reed valve that opens and closes the sub-discharge port, the plate-shaped main reed valve being provided on the fixed base plate; a main recessed portion formed in the main discharge port and opening toward the main reed valve so as to increase the cross-sectional area of ​​a flow path for fluid discharged toward the main reed valve; a sub-reed valve having a sub-reed recess formed in the sub-discharge port so as to increase a cross-sectional area of ​​a flow path for fluid discharged toward the sub-reed valve; a sealing area for sealing the sub-reed valve by contact between the fixed base plate and the sub-reed valve being larger than a sealing area for sealing the main recess by contact between the fixed base plate and the main reed valve.

[0089] <Appendix 2> The scroll compressor described in <Appendix 1>, characterized in that an opening area of ​​the sub-reed valve is smaller than an opening area of ​​the main reed valve, and an area of ​​the sub-reed valve is larger than an area of ​​the main reed valve.

[0090] <Appendix 3> a main arm portion is provided between the main reed valve and the fixed substrate, connecting the main reed valve and the fixed substrate; a concave main groove that intersects with the extending direction of the main arm portion and does not contact the main arm portion is provided in the fixed substrate; The scroll compressor according to <Appendix 1> or <Appendix 2>, wherein a sealing area for sealing the main recess by contact between the fixed base plate and the main reed valve is defined by contact between the fixed base plate and the main reed valve on the main discharge port side of the main groove.

[0091] <Appendix 4> an arm-shaped sub-arm portion is provided between the sub-reed valve and the fixed base plate to connect them, a concave sub-groove that intersects with the extension direction of the sub-arm portion and does not contact the sub-arm portion is provided on the fixed substrate; The scroll compressor according to any one of <Appendix 1> to <Appendix 3>, characterized in that the sealing area that seals the sub-recess by contact between the fixed base plate and the sub-reed valve is defined by contact between the fixed base plate and the sub-reed valve on the sub-discharge port side of the sub-groove. [Explanation of symbols]

[0092] 10...Scroll compressor, 11...Housing, 12h...Housing suction port, 14h...Housing discharge port, 15...Rotating shaft, 25...Fixed scroll, 25a...Fixed base plate, 25b...Fixed spiral wall, 26...Orbiting scroll, 26a...Orbiting base plate, 26b...Orbiting spiral wall, 27...Compression chamber, 40...Main discharge port, 41...Sub-discharge port, 42...Main recess, 43...Sub-recess, 54...Main arm portion, 55...Main reed valve, 56...Sub-arm portion, 57...Sub-reed valve, 61...First relief groove functioning as main groove and sub-groove, 62...Second relief groove functioning as sub-groove, C1...Compression mechanism, S1...Motor chamber which is suction chamber, S2...Discharge chamber.

Claims

1. a housing having a housing intake port for intake of fluid and a housing discharge port for discharge of fluid; a rotating shaft accommodated in the housing and supported by the housing so as to be rotatable about a rotation axis; a compression mechanism that is accommodated in the housing and has a fixed scroll that is fixed to the housing and an orbiting scroll that revolves by rotation of the rotation shaft, The housing is defined within it a suction chamber into which fluid is drawn from the housing suction port, a compression chamber which communicates with the suction chamber and compresses the fluid by meshing of the fixed scroll and the orbiting scroll, and a discharge chamber which can communicate with the compression chamber and into which fluid discharged from the compression chamber is discharged, the fixed scroll has a disk-shaped fixed base plate and a spiral-shaped fixed spiral wall that stands up from the fixed base plate, The orbiting scroll has a disk-shaped orbiting base plate facing the fixed base plate, and an orbiting spiral wall that stands up from the orbiting base plate toward the fixed base plate and has a spiral shape, a main discharge port for discharging compressed fluid into the discharge chamber is formed at the center of the fixed substrate; a sub-discharge port is formed in a portion of the fixed substrate different from the main discharge port, and the sub-discharge port discharges the fluid in the compression chamber to the discharge chamber when the pressure in the compression chamber reaches or exceeds a set pressure; a plate-shaped main reed valve that opens and closes the main discharge port, and a plate-shaped sub-reed valve that opens and closes the sub-discharge port, the plate-shaped main reed valve being provided on the fixed base plate; a main recessed portion formed in the main discharge port and opening toward the main reed valve so as to increase the cross-sectional area of ​​a flow path for fluid discharged toward the main reed valve; a sub-reed valve having a sub-reed recess formed in the sub-discharge port so as to increase a cross-sectional area of ​​a flow path for fluid discharged toward the sub-reed valve; a sealing area for sealing the sub-reed valve by contact between the fixed base plate and the sub-reed valve being larger than a sealing area for sealing the main recess by contact between the fixed base plate and the main reed valve.

2. 2. The scroll compressor according to claim 1, wherein an opening area of ​​the sub-reed valve is smaller than an opening area of ​​the main recess, and an area of ​​the sub-reed valve is larger than an area of ​​the main reed valve.

3. a main arm portion is provided between the main reed valve and the fixed substrate, connecting the main reed valve and the fixed substrate; a main groove having a concave shape that intersects with a direction in which the main arm portion extends and does not come into contact with the main arm portion is provided in the fixed substrate; 3. The scroll compressor according to claim 1, wherein a sealing area for sealing the main recess by contact between the fixed base plate and the main reed valve is defined by contact between the fixed base plate and the main reed valve on a side closer to the main discharge port than the main groove.

4. an arm-shaped sub-arm portion is provided between the sub-reed valve and the fixed base plate to connect them, a concave sub-groove that intersects with the extension direction of the sub-arm portion and does not contact the sub-arm portion is provided on the fixed substrate; 3. The scroll compressor according to claim 1, wherein a sealing area for sealing the sub-reed valve by contact between the fixed base plate and the sub-reed valve is defined by contact between the fixed base plate and the sub-reed valve on the sub-discharge port side of the sub-groove.

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