Scroll compressor

Abstract

To reduce the pressure loss of the fluid flowing through the intake passage and to suppress fluid intake pulsation. [Solution] The orbiting substrate 26a is provided with a passage-enlargement recess 50 that increases the passage cross-sectional area of ​​the intake passage 40. Therefore, even when the orbiting substrate 26a is closest to the fixed peripheral wall 25c, the passage-enlargement recess 50 increases the passage cross-sectional area of ​​the intake passage 40. Consequently, compared to a case where the passage-enlargement recess 50 is not provided on the orbiting substrate 26a, the narrowing of the intake passage 40 by the orbiting substrate 26a is suppressed. As a result, the pressure loss of the refrigerant gas flowing through the intake passage 40 is reduced. In addition, since the fluctuation of the passage cross-sectional area of ​​the intake passage 40 due to the orbital motion of the orbiting scroll 26 is reduced, intake pulsation of the refrigerant gas is suppressed.

Description

Technical Field

[0004] , , , , ,

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

Background Art

[0002] For example, as disclosed in Patent Document 1, a scroll compressor includes a housing, a rotating shaft, a fixed scroll, and a orbiting scroll. The rotating shaft is rotatably supported by the housing. The fixed scroll has a fixed substrate, a fixed spiral wall, and a fixed peripheral wall. The fixed spiral wall stands up from the fixed substrate. The fixed peripheral wall stands up from the fixed substrate and surrounds the fixed spiral wall. The orbiting scroll has an orbiting substrate and an orbiting spiral wall. The orbiting substrate faces the fixed substrate. The orbiting spiral wall stands up from the orbiting substrate toward the fixed substrate and meshes with the fixed spiral wall. And a compression chamber for compressing fluid is defined by the fixed substrate, the fixed spiral wall, the orbiting substrate, and the orbiting spiral wall. The orbiting scroll revolves inside the fixed peripheral wall as the rotating shaft rotates.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In such a scroll compressor, the orbiting substrate and the fixed peripheral wall partition the intake passage through which fluid is drawn into the compression chamber. When the orbiting scroll revolves inside the fixed peripheral wall as the rotation axis rotates, the orbiting substrate narrows the intake passage when it is closest to the fixed peripheral wall. This makes it easier for pressure loss to occur in the fluid flowing through the intake passage. Furthermore, the orbital motion of the orbiting scroll causes fluctuations in the cross-sectional area of ​​the intake passage. The greater the fluctuation in the cross-sectional area of ​​the intake passage, the worse the fluid intake pulsation becomes. [Means for solving the problem]

[0005] A scroll compressor that solves the above problems comprises a housing, a rotating shaft rotatably supported by the housing, a fixed scroll fixed to the housing and having a fixed base plate, a fixed spiral wall rising from the fixed base plate, and a fixed peripheral wall rising from the fixed base plate and surrounding the fixed spiral wall, and a rotating scroll having a rotating base plate facing the fixed base plate, and a rotating spiral wall rising from the rotating base plate toward the fixed base plate and engaging with the fixed spiral wall, and revolving inside the fixed peripheral wall as the rotating shaft rotates. A scroll compressor comprising a fixed substrate, a fixed spiral wall, a rotating substrate, and a rotating spiral wall, wherein a compression chamber for compressing a fluid is partitioned by the fixed substrate, the fixed spiral wall, the rotating substrate, and the rotating substrate and the fixed peripheral wall partition an intake passage for drawing the fluid into the compression chamber, wherein the rotating substrate is provided with a passage enlargement recess that increases the passage cross-sectional area of ​​the intake passage, the passage enlargement recess opens to the substrate end face which is the end face of the rotating substrate located on the rotating spiral wall side, and is formed by recessing a part of the outer peripheral surface of the rotating substrate.

[0006] According to this, the orbiting substrate is provided with a passage-enlarging recess that increases the passage cross-sectional area of ​​the intake passage. Therefore, even when the orbiting scroll revolves inside the fixed peripheral wall as the rotation axis rotates and the orbiting substrate comes closest to the fixed peripheral wall, the passage-enlarging recess increases the passage cross-sectional area of ​​the intake passage. Thus, compared to a case where the orbiting substrate is not provided with a passage-enlarging recess, it is possible to suppress the narrowing of the intake passage by the orbiting substrate. The passage-enlarging recess is formed by opening into the substrate end face of the orbiting substrate and recessing a part of the outer peripheral surface of the orbiting substrate. Therefore, the fluid flowing through the intake passage passes inside the passage-enlarging recess and flows toward the compression chamber. Thus, the pressure loss of the fluid flowing through the intake passage can be reduced. In addition, since the fluctuation of the passage cross-sectional area of ​​the intake passage due to the orbital motion of the orbiting scroll can be reduced, fluid intake pulsation can be suppressed. As a result, the pressure loss of the fluid flowing through the intake passage can be reduced and fluid intake pulsation can be suppressed.

[0007] In the scroll compressor described above, the passage enlargement recess is preferably located radially outward from the surface of the fixed spiral wall that partitions the compression chamber. This design prevents the compression chamber and the intake passage from communicating through the inside of the passage enlargement recess due to the orbital motion of the revolving scroll. Therefore, it is possible to maintain the compression efficiency of the fluid in the compression chamber while reducing the pressure loss of the fluid flowing through the intake passage and suppressing fluid intake pulsation.

[0008] In the scroll compressor described above, the passage enlargement recess is preferably a notch that is recessed relative to the substrate end face and continuous with the outer circumferential surface of the rotating substrate. A notch that is recessed relative to the substrate end face and continuous with the outer circumferential surface of the rotating substrate is a suitable configuration as a passage-enlarging recess formed by opening to the substrate end face and recessing a portion of the outer circumferential surface of the rotating substrate. [Effects of the Invention]

[0009] According to this invention, it is possible to reduce the pressure loss of the fluid flowing through the intake passage and suppress fluid intake pulsation. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a cross-sectional view showing a scroll compressor in an embodiment. [Figure 2] Figure 2 is a cross-sectional view of a scroll compressor. [Figure 3] Figure 3 is a front view of the orbiting scroll. [Figure 4] Figure 4 is a perspective view showing a portion of the orbiting scroll. [Figure 5] Figure 5 is a cross-sectional view showing a magnified portion of a scroll compressor. [Figure 6] Figure 6 is a cross-sectional view showing a magnified portion of a scroll compressor. [Figure 7] Figure 7 is a cross-sectional view showing an enlarged portion of a scroll compressor. [Figure 8] Figure 8 is a graph showing the variation in the cross-sectional area of ​​the intake passage. [Modes for carrying out the invention]

[0011] An embodiment of the scroll compressor will be described below with reference to Figures 1 to 8. The scroll compressor of this embodiment is used, for example, in a vehicle air conditioning system. <Basic configuration of a scroll compressor> As shown in Figure 1, the scroll compressor 10 is equipped with a cylindrical housing 11. The housing 11 includes a motor housing 12, a support housing 13, and a discharge housing 14. The motor housing 12, the support housing 13, and the discharge housing 14 are made of metal. For example, the motor housing 12, the support housing 13, and the discharge housing 14 are made of aluminum. The scroll compressor 10 also includes a rotating shaft 15. The rotating shaft 15 is housed within the housing 11.

[0012] 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 circumference of the end wall 12a. The axial direction of the peripheral wall 12b coincides with the axial direction of the rotation axis 15. The motor housing 12 has an intake port 12h. Therefore, the housing 11 has an intake port 12h. The intake port 12h is formed in the peripheral wall 12b. The intake port 12h is formed in the portion of the peripheral wall 12b located closer to the end wall 12a. The intake port 12h communicates the inside and outside of the motor housing 12. The intake port 12h draws in refrigerant gas as a fluid.

[0013] The motor housing 12 has a cylindrical boss portion 12d. The boss portion 12d protrudes from the inner surface of the end wall 12a. The first end, which is one axial end of the rotating shaft 15, is inserted into the boss portion 12d. The scroll compressor 10 is equipped with a rolling bearing 16. The rolling bearing 16 is provided between the inner circumferential surface of the boss portion 12d and the outer circumferential surface of the first end of the rotating shaft 15. The first end of the rotating shaft 15 is rotatably supported in the motor housing 12 via the rolling bearing 16.

[0014] The pivot housing 13 has a disc-shaped end wall 17 and a cylindrical circumferential wall 18. The circumferential wall 18 extends cylindrically from the outer circumference of the end wall 17. The axial direction of the circumferential wall 18 coincides with the axial direction of the rotation axis 15. The pivot housing 13 has an annular flange wall 19. The flange wall 19 extends radially outward from the rotation axis 15 from the end on the outer circumferential surface of the circumferential wall 18 opposite to the end wall 17. The outer circumference of the flange wall 19 is in contact with the open end of the circumferential wall 12b of the motor housing 12.

[0015] The shaft support housing 13 has an insertion hole 17a. The insertion hole 17a is formed in the central portion of the end wall 17. The insertion hole 17a penetrates the end wall 17 in the thickness direction. A rotating shaft 15 is inserted into the insertion hole 17a. An end face 15e located on the second end side, which is the other axial end of the rotating shaft 15, is located inside 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. And the rotating shaft 15 is rotatably supported by the shaft support housing 13 via the rolling bearing 21. Thus, the rotating shaft 15 is rotatably supported by the housing 11.

[0016] The housing 11 has a motor chamber S1. The motor chamber S1 is partitioned by the motor housing 12 and the shaft support housing 13. The motor chamber S1 communicates with the suction port 12h. Refrigerant gas from the suction port 12h is inhaled into the motor chamber S1. Therefore, the motor chamber S1 is a suction chamber into which refrigerant gas is inhaled from the suction port 12h

[0017] The scroll compressor 10 includes a motor 22. The motor 22 is housed in the 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 peripheral surface of the peripheral wall 12b of the motor housing 12. The coil 23b is wound around the stator core 23a. And when power controlled by an inverter (not shown) is supplied to the coil 23b, the rotor 24 rotates. Thereby, the rotating shaft 15 rotates integrally with the rotor 24.

[0018] The scroll compressor 10 includes a compression mechanism C1. The compression mechanism C1 has a fixed scroll 25 and a orbiting scroll 26. Therefore, the scroll compressor 10 includes the fixed scroll 25 and the orbiting scroll 26. The fixed scroll 25 has a fixed substrate 25a, a fixed spiral wall 25b, and a fixed peripheral wall 25c. The fixed substrate 25a is disk-shaped. A discharge port 25h is formed at the center of the fixed substrate 25a. The discharge port 25h is circular hole-shaped. The discharge port 25h penetrates the fixed substrate 25a in the thickness direction of the fixed substrate 25a. The fixed spiral wall 25b stands up from the fixed substrate 25a. The fixed peripheral wall 25c stands up cylindrically from the outer peripheral portion of the fixed substrate 25a. The fixed peripheral wall 25c surrounds the fixed spiral wall 25b.

[0019] The opening end face of the fixed peripheral wall 25c is located on the side opposite to the fixed substrate 25a with respect to the tip end face of the fixed spiral wall 25b. The opening end face of the fixed peripheral wall 25c contacts the flange wall 19 of the shaft support housing 13. A stepped surface 25d is formed on the outer peripheral surface of the fixed peripheral wall 25c. The stepped surface 25d is annular. The stepped surface 25d is located on the side opposite to the opening end face of the fixed peripheral wall 25c. The stepped surface 25d extends in the radial direction of the rotating shaft 15.

[0020] The scroll compressor 10 includes a valve mechanism 25v. The valve mechanism 25v is attached to the end face of the fixed substrate 25a on the side opposite to the fixed spiral wall ;25b. The valve mechanism 25v is configured to be able to open and close the discharge port 25h.

[0021] The orbiting scroll 26 has an orbiting substrate 26a and an orbiting spiral wall 26b. The orbiting substrate 26a is disc-shaped. The orbiting substrate 26a faces the fixed substrate 25a. The orbiting spiral wall 26b rises from the orbiting substrate 26a toward the fixed substrate 25a. The orbiting spiral wall 26b meshes with the fixed spiral wall 25b. The orbiting scroll 26 is located inside the fixed peripheral wall 25c. The leading edge of the fixed spiral wall 25b is in contact with the orbiting substrate 26a. The leading edge of the orbiting spiral wall 26b is in contact with the fixed substrate 25a. Multiple compression chambers 27 are partitioned by the fixed substrate 25a, the fixed spiral wall 25b, the orbiting substrate 26a, and the orbiting spiral wall 26b. Each compression chamber 27 compresses the refrigerant gas.

[0022] The orbiting scroll 26 has a cylindrical boss portion 26c. The boss portion 26c protrudes from the center of the end face 26e of the orbiting substrate 26a opposite to the fixed substrate 25a. The axial direction of the boss portion 26c coincides with the axial direction of the rotation axis 15.

[0023] The orbiting scroll 26 has multiple recesses 26d. The multiple recesses 26d are formed around the boss portion 26c on the end face 26e of the orbiting substrate 26a. The multiple recesses 26d are arranged at predetermined intervals in the circumferential direction of the rotation axis 15. Note that in Figure 1, only one recess 26d is shown for illustrative purposes. An annular ring member 28 is fitted into each recess 26d. The scroll compressor 10 has multiple pins 29. Each pin 29 is provided on the pivot housing 13. Each pin 29 protrudes from the end face 13e on the orbiting scroll 26 side of the pivot housing 13. Each pin 29 is inserted into each ring member 28.

[0024] The scroll compressor 10 is equipped with an eccentric shaft 31. The eccentric shaft 31 protrudes toward the orbiting scroll 26 from a portion of the end face 15e of the rotating shaft 15 that is eccentric with respect 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 portion 26c.

[0025] 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 circumferential surface of the eccentric shaft 31. The balance weight 32 is integrally formed with the bush 33. The balance weight 32 is housed within the circumferential wall 18 of the support housing 13. The orbiting scroll 26 is supported on the eccentric shaft 31 so as to be rotatable relative to the eccentric shaft 31 via the bush 33 and rolling bearings 34.

[0026] The rotation of the rotating shaft 15 is transmitted to the orbiting scroll 26 via the eccentric shaft 31, bushing 33, and rolling bearing 34, causing the orbiting scroll 26 to rotate on its own axis. Then, the rotation of the orbiting scroll 26 is prevented by the contact between each pin 29 and the inner circumferential surface of each ring member 28, allowing only the orbital motion of the orbiting scroll 26 to be permitted. As a result, the orbiting scroll 26 revolves with its orbiting spiral wall 26b in contact with the fixed spiral wall 25b, and the refrigerant gas is compressed as the volume of the compression chamber 27 decreases. Therefore, the orbiting scroll 26 revolves inside the fixed circumferential wall 25c as the rotating shaft 15 rotates. The balance weight 32 counteracts the centrifugal force acting on the orbiting scroll 26 when it revolves, reducing the amount of unbalance of the orbiting scroll 26.

[0027] 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 circumference of the end wall 14a. The axial direction of the peripheral wall 14b coincides with the axial direction of the rotation axis 15. The open end of the peripheral wall 14b is in contact with the stepped surface 25d of the fixed peripheral wall 25c. The peripheral wall 14b surrounds the portion of the fixed scroll 25 that is opposite to the fixed substrate 25a from the stepped surface 25d.

[0028] The discharge housing 14, the support housing 13, and the motor housing 12 are fixed together by bolts (not shown) that pass through the peripheral wall 14b of the discharge housing 14, the fixed peripheral wall 25c, and the outer circumference 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, the fixed peripheral wall 25c to the flange wall 19 of the support housing 13, and the discharge housing 14 to the fixed peripheral wall 25c. Therefore, the motor housing 12, the support housing 13, the fixed scroll 25, and the discharge housing 14 are arranged in this order, aligned in the axial direction of the rotating shaft 15. The fixed scroll 25 is fixed to the support housing 13. Therefore, the fixed scroll 25 is fixed to the housing 11.

[0029] The scroll compressor 10 is equipped with a discharge chamber S2. The discharge chamber S2 is formed within the discharge housing 14. The discharge chamber S2 is partitioned by the discharge housing 14 and the fixed base plate 25a of the fixed scroll 25. Thus, the discharge chamber S2 is partitioned within the housing 11. The refrigerant gas discharged from the compression chamber 27 is discharged into the discharge chamber S2 through the discharge port 25h.

[0030] The discharge housing 14 has a discharge port 14h. Therefore, the housing 11 has a discharge port 14h. The discharge port 14h is formed in the end wall 14a of the discharge housing 14. The discharge port 14h communicates with the discharge chamber S2. The discharge port 14h discharges the refrigerant gas in the discharge chamber S2.

[0031] The discharge port 14h and the intake port 12h are connected by an external refrigerant circuit 20. The external refrigerant circuit 20 includes a condenser, an expansion valve, and an evaporator (not shown). The refrigerant gas discharged from the discharge port 14h flows through the external refrigerant circuit 20. The refrigerant gas flowing through the external refrigerant circuit 20 passes through the condenser, expansion valve, and evaporator and returns to the motor chamber S1 via the intake port 12h. The scroll compressor 10 and the external refrigerant circuit 20 constitute a vehicle air conditioning system.

[0032] <Suction passage> Multiple grooves 35 are formed on the inner circumferential surface of the peripheral wall 12b of the motor housing 12. Each groove 35 opens at the open end of the peripheral wall 12b. Multiple holes 36 are formed on the outer circumferential portion of the flange wall 19 of the pivot housing 13. Each hole 36 penetrates the flange wall 19 in the thickness direction. Each hole 36 communicates with each of the grooves 35.

[0033] As shown in Figures 1 and 2, a plurality of flow path forming recesses 37 are formed on the inner circumferential surface of the fixed peripheral wall 25c. Each flow path forming recess 37 communicates with each hole 36. The flow path forming recess 37 has a first recess 38 and a second recess 39. The first recess 38 is continuous with the open end face of the fixed peripheral wall 25c. The first recess 38 communicates with the hole 36. The second recess 39 is recessed in the bottom surface of the first recess 38. The second recess 39 communicates with the outermost part of the compression chamber 27. In this way, the compression chamber 27 communicates with the motor chamber S1 via the groove 35, the hole 36, the first recess 38 of the flow path forming recess 37, and the second recess 39 of the flow path forming recess 37. The refrigerant gas in the motor chamber S1 passes through each groove 35, each hole 36, the first recess 38 of each flow path forming recess 37, and the second recess 39 of each flow path forming recess 37, and is drawn into the compression chamber 27. The refrigerant gas drawn into the compression chamber 27 is compressed within the compression chamber 27 by the orbital motion of the orbiting scroll 26.

[0034] Thus, the groove 35, the hole 36, the first recess 38 of the flow path forming recess 37, and the second recess 39 of the flow path forming recess 37 form an intake passage 40 for drawing refrigerant gas into the compression chamber 27. The swivel substrate 26a overlaps the first recess 38 and the second recess 39 of the flow path forming recess 37 in the radial direction of the rotation axis 15. The swivel substrate 26a and the flow path forming recess 37 define the intake passage 40. Therefore, the swivel substrate 26a and the fixed peripheral wall 25c define the intake passage 40.

[0035] <Enlarged passageway recess> As shown in Figures 3 and 4, the rotating substrate 26a is provided with a passage-enlargement recess 50. The passage-enlargement recess 50 opens into the substrate end face 26f, which is the end face of the rotating substrate 26a located on the side of the rotating spiral wall 26b, and is formed by recessing a portion of the outer circumferential surface of the rotating substrate 26a.

[0036] The passage enlargement recess 50 is defined by an axial inner surface 51, a radial inner surface 52, a first circumferential inner surface 53, and a second circumferential inner surface 54. The axial inner surface 51 extends from the substrate end face 26f in the thickness direction of the swivel substrate 26a. The axial inner surface 51 is curved in an arc shape so as to be convex radially outward of the swivel substrate 26a. When the swivel substrate 26a is viewed from the front, the axial inner surface 51 extends along the outer circumferential surface of the swivel substrate 26a. The radial inner surface 52 extends radially outward of the swivel substrate 26a from the end of the axial inner surface 51 opposite to the substrate end face 26f. The end of the radial inner surface 52 opposite to the axial inner surface 51 is continuous with the outer circumferential surface of the swivel substrate 26a.

[0037] The first circumferential inner surface 53 extends from the substrate end face 26f in the thickness direction of the swivel substrate 26a, and also extends from the outer circumferential surface of the swivel substrate 26a in the radial direction of the swivel substrate 26a. The first circumferential inner surface 53 connects one circumferential end of the swivel substrate 26a on the axial inner surface 51 to one circumferential end of the swivel substrate 26a on the radial inner surface 52. The second circumferential inner surface 54 extends from the substrate end face 26f in the thickness direction of the swivel substrate 26a, and also extends from the outer circumferential surface of the swivel substrate 26a in the radial direction of the swivel substrate 26a. The second circumferential inner surface 54 connects the other circumferential end of the swivel substrate 26a on the axial inner surface 51 to the other circumferential end of the swivel substrate 26a on the radial inner surface 52. The first circumferential inner surface 53 and the second circumferential inner surface 54 extend parallel to each other. The first circumferential inner surface 53 and the second circumferential inner surface 54 face each other in the circumferential direction of the rotating substrate 26a.

[0038] A chamfered portion 55 is provided around the entire circumference of the corner of the swivel substrate 26a. Thus, the entire circumference of the corner of the swivel substrate 26a is chamfered. The chamfered portion 55 is continuous with the first circumferential inner surface 53 and the second circumferential inner surface 54, respectively. The passage enlargement recess 50 is recessed more than the chamfered portion 55. Thus, the passage enlargement recess 50 is a notch that is recessed relative to the substrate end face 26f and is continuous with the outer circumferential surface of the swivel substrate 26a. Therefore, the passage enlargement recess 50 does not penetrate the swivel substrate 26a in the thickness direction of the swivel substrate 26a.

[0039] As shown in Figures 5 and 6, the orbiting scroll 26 is positioned inside the fixed peripheral wall 25c relative to the fixed scroll 25 such that the passage enlargement recess 50 overlaps one of the multiple flow path forming recesses 37 in the radial direction of the rotation axis 15. Then, as shown in Figure 6, the passage enlargement recess 50 increases the cross-sectional area of ​​the intake passage 40 even when the orbiting substrate 26a is closest to the flow path forming recess 37 as the orbiting scroll 26 revolves inside the fixed peripheral wall 25c in conjunction with the rotation of the rotation axis 15. In this way, the passage enlargement recess 50 increases the cross-sectional area of ​​the intake passage 40. Note that Figure 5 shows the state where the orbiting substrate 26a is furthest from the flow path forming recess 37 corresponding to the passage enlargement recess 50. Figure 6 shows the state where the orbiting substrate 26a is closest to the flow path forming recess 37 corresponding to the passage enlargement recess 50.

[0040] Figure 7 shows the state in which the swivel substrate 26a is furthest from the passage-enlargement recess 50 and the corresponding flow-channel forming recess 37. As shown in Figure 7, in the state in which the swivel substrate 26a is furthest from the passage-enlargement recess 50 and the corresponding flow-channel forming recess 37, the passage-enlargement recess 50 overlaps the fixed spiral wall 25b of the fixed scroll 25 in the axial direction of the rotation axis 15. In detail, in the state in which the swivel substrate 26a is furthest from the passage-enlargement recess 50 and the corresponding flow-channel forming recess 37, the entire axial inner surface 51 of the passage-enlargement recess 50 overlaps the fixed spiral wall 25b in the axial direction of the rotation axis 15. Furthermore, in the state in which the swivel substrate 26a is furthest from the passage-enlargement recess 50 and the corresponding flow-channel forming recess 37, the axial inner surface 51 is located radially outward of the rotation axis 15 than the surface of the fixed spiral wall 25b that is located radially inward of the rotation axis 15. The surface of the fixed spiral wall 25b located radially inward of the rotation axis 15 is the surface 251b that defines the compression chamber 27 in the fixed spiral wall 25b. Thus, the passage enlargement recess 50 is located radially outward of the rotation axis 15 than the surface 251b that defines the compression chamber 27 in the fixed spiral wall 25b.

[0041] The depth of the axial inner surface 51 relative to the outer surface of the swivel substrate 26a is set such that, when the swivel substrate 26a is furthest from the passage-enlargement recess 50 and the corresponding flow-flow forming recess 37, the axial inner surface 51 is located radially outward of the rotation axis 15 than the surface 251b that defines the compression chamber 27 in the fixed spiral wall 25b.

[0042] [Effect of the Embodiment] Next, the operation of this embodiment will be described. Even when the orbiting scroll 26 revolves inside the fixed peripheral wall 25c as the rotation axis 15 rotates, and the orbiting substrate 26a comes closest to the flow path forming recess 37 of the fixed peripheral wall 25c, the passage enlargement recess 50 increases the passage cross-sectional area of ​​the intake passage 40.

[0043] Figure 8 shows the relationship between the rotation angle of the rotation axis 15 and the passage cross-sectional area of ​​the intake passage 40. The solid line L11 shows the variation in the passage cross-sectional area of ​​the intake passage 40 when the passage enlargement recess 50 is provided in the swivel substrate 26a. The dashed line L12 shows the variation in the passage cross-sectional area of ​​the intake passage 40 when the passage enlargement recess 50 is not provided in the swivel substrate 26a. As can be seen by comparing the solid line L11 and the dashed line L12 in Figure 8, the narrowing of the intake passage 40 by the swivel substrate 26a is suppressed compared to the case where the passage enlargement recess 50 is not provided in the swivel substrate 26a.

[0044] The passage enlargement recess 50 is formed by opening into the substrate end face 26f of the orbiting substrate 26a and recessing a portion of the outer circumferential surface of the orbiting substrate 26a. As a result, the refrigerant gas flowing through the intake passage 40 passes inside the passage enlargement recess 50 and flows toward the compression chamber 27. Therefore, the pressure loss of the refrigerant gas flowing through the intake passage 40 is reduced. In addition, the fluctuation of the passage cross-sectional area of ​​the intake passage 40 due to the orbital motion of the orbiting scroll 26 is reduced, so that refrigerant gas intake pulsation is suppressed.

[0045] The passage enlargement recess 50 is located radially outward from the rotation axis 15 than the surface 251b that demarcates the compression chamber 27 in the fixed spiral wall 25b. Therefore, the compression chamber 27 and the intake passage 40 are prevented from communicating through the inside of the passage enlargement recess 50 as the orbital motion of the orbiting scroll 26 occurs.

[0046] [Effects of the Embodiment] The above embodiment can be achieved to obtain the following effects. (1) The orbiting substrate 26a is provided with a passage-enlargement recess 50 that increases the passage cross-sectional area of ​​the intake passage 40. As a result, even when the orbiting scroll 26 revolves inside the fixed peripheral wall 25c as the rotation axis 15 rotates and the orbiting substrate 26a comes closest to the fixed peripheral wall 25c, the passage-enlargement recess 50 increases the passage cross-sectional area of ​​the intake passage 40. Therefore, compared to a case where the passage-enlargement recess 50 is not provided on the orbiting substrate 26a, it is possible to suppress the narrowing of the intake passage 40 by the orbiting substrate 26a. The passage-enlargement recess 50 is formed by opening into the substrate end face 26f of the orbiting substrate 26a and recessing a part of the outer peripheral surface of the orbiting substrate 26a. As a result, the refrigerant gas flowing through the intake passage 40 passes inside the passage-enlargement recess 50 and flows toward the compression chamber 27. Therefore, the pressure loss of the refrigerant gas flowing through the intake passage 40 can be reduced. Furthermore, the fluctuation in the cross-sectional area of ​​the intake passage 40 due to the orbital motion of the orbiting scroll 26 can be reduced, thereby suppressing suction pulsation of the refrigerant gas. As a result, the pressure loss of the refrigerant gas flowing through the intake passage 40 can be reduced, and suction pulsation of the refrigerant gas can be suppressed.

[0047] (2) The passage enlargement recess 50 is located radially outward of the rotation axis 15 than the surface 251b that partitions the compression chamber 27 in the fixed spiral wall 25b. This prevents the compression chamber 27 and the intake passage 40 from communicating through the inside of the passage enlargement recess 50 as the orbital motion of the orbiting scroll 26 occurs. Therefore, it is possible to reduce the pressure loss of the refrigerant gas flowing through the intake passage 40 and suppress refrigerant gas intake pulsation while maintaining the compression efficiency of the refrigerant gas in the compression chamber 27.

[0048] (3) A notch that is recessed relative to the substrate end face 26f and continuous with the outer peripheral surface of the swivel substrate 26a is a suitable configuration as a passage enlargement recess 50 that opens into the substrate end face 26f and is formed by recessing a portion of the outer peripheral surface of the swivel substrate 26a.

[0049] (4) The passage enlargement recess 50 does not penetrate the rotating substrate 26a in the thickness direction of the rotating substrate 26a. Therefore, the strength of the rotating substrate 26a can be ensured. As a result, it is easier to avoid problems such as the rotating substrate 26a being deformed by the pressure of the refrigerant gas, and thus the reliability of the scroll compressor 10 can be improved.

[0050] [Example of changes] The above embodiment can be implemented with the following modifications. The above embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0051] ○ In the embodiment, for example, the passage enlargement recess 50 may be formed such that the first circumferential inner surface 53 and the second circumferential inner surface 54 gradually approach each other as they move away from the outer circumferential surface of the pivoting substrate 26a. Alternatively, for example, the passage enlargement recess 50 may be formed such that the depth of the axial inner surface 51 relative to the outer circumferential surface of the pivoting substrate 26a is partially different. Thus, the shape of the passage enlargement recess 50 may be appropriately modified.

[0052] ○ In this embodiment, the passage enlargement recess 50 may be configured such that, for example, a portion of the passage enlargement recess 50 is located radially inward of the rotation axis 15 than the surface 251b that demarcates the compression chamber 27 in the fixed spiral wall 25b.

[0053] ○ In this embodiment, the passage enlargement recess 50 may be a recess that penetrates the rotating substrate 26a in the thickness direction of the rotating substrate 26a. ○ In this embodiment, the rotating substrate 26a may be provided with a plurality of passage-enlarging recesses 50 corresponding to each flow-flow forming recess 37.

[0054] ○ In this embodiment, it is not necessary to provide a flow path forming recess 37 in the fixed peripheral wall 25c. In this case, the inner circumferential surface of the fixed peripheral wall 25c is formed with an inner diameter that communicates with the hole 36, and the intake passage 40 is partitioned by the rotating substrate 26a and the fixed peripheral wall 25c.

[0055] ○ In this embodiment, the scroll compressor 10 does not have to be driven by a motor 22, but may be driven by, for example, a vehicle engine.

[0056] ○ In this embodiment, the scroll compressor 10 was used in a vehicle air conditioning system, but it is not limited to this. For example, the scroll compressor 10 may be installed in a fuel cell vehicle and used to compress air as a fluid supplied to the fuel cell. [Explanation of symbols]

[0057] 10...Scroll compressor, 11...Housing, 15...Rotating shaft, 25...Fixed scroll, 25a...Fixed substrate, 25b...Fixed spiral wall, 25c...Fixed peripheral wall, 26...Orbiting scroll, 26a...Orbiting substrate, 26b...Orbiting spiral wall, 26f...Substrate end face, 27...Compression chamber, 40...Intake passage, 50...Enlarged passage recess, 251b...Surface.

Claims

1. Housing and A rotating shaft rotatably supported in the aforementioned housing, A fixed substrate, a fixed spiral wall rising from the fixed substrate, and a fixed peripheral wall rising from the fixed substrate and surrounding the fixed spiral wall, and a fixed scroll fixed to the housing, The system comprises a rotating substrate facing the fixed substrate, and a rotating scroll having a rotating spiral wall that rises from the rotating substrate toward the fixed substrate and engages with the fixed spiral wall, and which revolves inside the fixed peripheral wall as the rotation axis rotates, The compression chamber for compressing the fluid is partitioned by the fixed substrate, the fixed spiral wall, the rotating substrate, and the rotating spiral wall. The rotating substrate and the fixed peripheral wall partition an intake passage for drawing the fluid into the compression chamber in a scroll-type compressor. The rotating substrate is provided with a passage enlargement recess that increases the passage cross-sectional area of ​​the intake passage. The scroll compressor is characterized in that the passage enlargement recess opens to the substrate end face, which is the end face of the rotating substrate located on the rotating spiral wall side, and is formed by recessing a portion of the outer circumferential surface of the rotating substrate.

2. The scroll compressor according to claim 1, characterized in that the passage enlargement recess is located radially outward from the surface of the rotation axis that partitions the compression chamber in the fixed spiral wall.

3. The scroll compressor according to claim 1 or 2, characterized in that the passage enlargement recess is recessed relative to the substrate end face and is a notch continuous with the outer circumferential surface of the rotating substrate.

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