Double-rotating scroll compressor

Abstract

To provide a double-rotating scroll compressor capable of reducing a thrust load applied from a scroll compression unit to a housing to suppress noise vibration and power increase.SOLUTION: In this double-rotating scroll compressor, a scroll compression unit 80 is housed in a suction chamber 61A. On one side of the scroll compression unit 80 in a thrust direction, a pressure adjustment chamber 76 is provided, into which fluid at the suction pressure in the suction chamber, a discharge pressure in a discharge chamber, or an intermediate pressure between the suction pressure and the discharge pressure is introduced to reduce a thrust load acting on the scroll compression unit in the thrust direction. The discharge pressure of the fluid introduced into the pressure adjustment chamber 76 counters the discharge pressure acting on the scroll compression unit 80 from the other side in the thrust direction. This reduces the thrust load of the scroll compression unit 80 on one side in the thrust direction with respect to a housing 60.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] A conventional double-rotating scroll compressor is disclosed in Patent Document 1. This double-rotating scroll compressor includes a drive mechanism, a drive scroll, a driven mechanism, a driven scroll, and a housing.

[0003] The housing has a suction chamber into which fluid is drawn from the outside, and a discharge chamber from which the fluid is discharged to the outside.

[0004] The drive scroll is rotationally driven about a drive axis by a drive mechanism, and the driven scroll is rotationally driven by the drive scroll and the driven mechanism about a driven axis while being eccentric with respect to the drive scroll.

[0005] The drive scroll has a drive end plate extending across the drive axis and a drive scroll having a spiral shape and projecting from the drive end plate toward the driven scroll.

[0006] The driven scroll has a driven end plate and a driven volute, the driven end plate extending across the driven axis, and the driven volute protrudes from the driven end plate toward the driving scroll and forms a spiral shape.

[0007] The driving scroll and the driven scroll face each other to form a compression chamber, and the volume of the compression chamber is changed by the rotational driving and the rotational driven, and the fluid sucked from the suction chamber is compressed and discharged into the discharge chamber in accordance with the change in volume.

[0008] In this double-rotating scroll compressor, a pair of bearings are arranged between a drive scroll and a driven scroll, and the drive scroll is rotatably supported relative to the housing via a drive-side bearing, and the driven scroll is rotatably supported relative to the housing via a driven-side bearing. In other words, this double-rotating scroll compressor is a cantilever support type in which both the drive scroll and the driven scroll are supported in a cantilevered manner relative to the housing.

[0009] Patent Document 2 discloses another conventional double-rotating scroll compressor, which is a double-supported type. In this double-rotating scroll compressor, the drive scroll is supported by a housing in a double-supported manner, and the driven scroll is supported by the housing in a cantilevered manner. The drive scroll has a cover body connected to the drive end plate, facing the drive end plate in the drive axial direction and sandwiching the driven scroll between them. A first supported portion provided on the drive end plate is supported by a first supported portion of the housing via a first bearing, and a second supported portion provided on the cover body is supported by a second supported portion of the housing via a second bearing. In addition, a third supported portion provided on the driven end plate of the driven scroll is supported by a third supported portion of the housing via a third bearing. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-310073 [Patent Document 2] Japanese Patent Application Publication No. 7-229480 Summary of the Invention [Problem to be solved by the invention]

[0011] However, in both double-rotating scroll compressors, whether they are cantilever-supported or double-supported, both the driving scroll and the driven scroll are simply supported by the housing via bearings, so the entire scroll compression section consisting of the driving scroll and the driven scroll can move in the thrust direction relative to the housing.

[0012] In such a configuration, for example, if the scroll compression section is housed in the suction chamber, when discharge pressure acts on the scroll compression section from one side in the thrust direction, the scroll compression section is pushed to the other side in the thrust direction. Therefore, in this case, a structure for bearing the thrust load from the scroll compression section is required on the other side of the scroll compression section. If, for example, a ball bearing is used as a radial bearing that can also bear the thrust load, problems with vibration and noise may be a concern. Furthermore, if a radial bearing and a thrust bearing are used together, problems with increased power may be a concern.

[0013] The present invention has been made in consideration of the above-described conventional circumstances, and an object to be achieved is to provide a double-rotating scroll compressor that can reduce the thrust load applied from the scroll compression section to the housing, thereby suppressing vibration noise and an increase in power consumption. [Means for solving the problem]

[0014] The present invention 1st The double rotary scroll compressor includes a housing having a suction chamber into which fluid is drawn from the outside and a discharge chamber from which the fluid is discharged to the outside; a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and defining a compression chamber for compressing a fluid between the first scroll and the second scroll, the first scroll has a first end plate and a first scroll body that is integral with the first end plate and protrudes in a spiral shape toward the second scroll, The second scroll is a double-rotating scroll compressor having a second end plate and a second scroll body that is integral with the second end plate and protrudes in a spiral shape toward the first scroll, The first scroll and the second scroll constitute a scroll compression section, A pressure adjustment chamber is provided on one side of the scroll compression section in the thrust direction, and the pressure adjustment chamber reduces the thrust load acting on the scroll compression section in the thrust direction by introducing a fluid having a suction pressure in the suction chamber, a discharge pressure in the discharge chamber, or an intermediate pressure between the suction pressure and the discharge pressure. 、 the suction chamber is a scroll accommodating chamber that accommodates the scroll compression section, the discharge pressure acts on the scroll compression section from the other side in the thrust direction, The fluid at the discharge pressure or the intermediate pressure is introduced into the pressure adjustment chamber, the first scroll has a first supported portion extending from the first end plate to a side opposite to the compression chamber, a cover body connected to the first end plate and facing the first end plate in the thrust direction while sandwiching the second scroll therebetween, and a second supported portion extending from the cover body to a side opposite to the compression chamber, the second scroll has a third journal portion provided on the second end plate opposite to the compression chamber, The housing includes: a first partition wall that partitions the scroll accommodating chamber while facing the first end plate in the thrust direction; and a first journal portion provided on the first partition wall; a second partition wall that partitions the scroll accommodating chamber while facing the cover body in the thrust direction, and a second journal portion that is provided on the second partition wall, Further provided is a third support portion disposed eccentrically relative to the second support portion, The first to third supported portions are supported by the first to third supporting portions via bearings, respectively. The pressure adjustment chamber is formed between the second end plate and the third support portion. It is characterized by the fact that The second double rotary scroll compressor of the present invention includes a housing having a suction chamber into which a fluid is drawn from the outside and a discharge chamber from which the fluid is discharged to the outside; a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and defining a compression chamber for compressing a fluid between the first scroll and the second scroll, the first scroll has a first end plate and a first scroll body that is integral with the first end plate and protrudes in a spiral shape toward the second scroll, The second scroll is a double-rotating scroll compressor having a second end plate and a second scroll body that is integral with the second end plate and protrudes in a spiral shape toward the first scroll, The first scroll and the second scroll constitute a scroll compression section, a pressure adjustment chamber is provided on one side of the scroll compression section in the thrust direction, into which a fluid having a suction pressure in the suction chamber, a discharge pressure in the discharge chamber, or an intermediate pressure between the suction pressure and the discharge pressure is introduced, thereby reducing a thrust load acting on the scroll compression section in the thrust direction; the suction chamber is a scroll accommodating chamber that accommodates the scroll compression section, the discharge pressure acts on the scroll compression section from the other side in the thrust direction, The fluid at the discharge pressure or the intermediate pressure is introduced into the pressure adjustment chamber, the first scroll has a first supported portion extending from the first end plate to a side opposite to the compression chamber, a cover body connected to the first end plate and facing the first end plate in the thrust direction while sandwiching the second scroll therebetween, and a second supported portion extending from the cover body to a side opposite to the compression chamber, the second scroll has a third journal portion provided on the second end plate opposite to the compression chamber, The housing includes: a first partition wall that partitions the scroll accommodating chamber while facing the first end plate in the thrust direction; and a first journal portion provided on the first partition wall; a second partition wall that partitions the scroll accommodating chamber while facing the cover body in the thrust direction, and a second journal portion that is provided on the second partition wall, Further provided is a third support portion disposed eccentrically relative to the second support portion, The first to third supported portions are supported by the first to third supporting portions via bearings, respectively. The pressure adjustment chamber is formed between the second end plate and the second bearing portion. A third double rotary scroll compressor of the present invention includes a housing having a suction chamber into which a fluid is drawn from the outside and a discharge chamber from which the fluid is discharged to the outside; a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and defining a compression chamber for compressing a fluid between the first scroll and the second scroll, the first scroll has a first end plate and a first scroll body that is integral with the first end plate and protrudes in a spiral shape toward the second scroll, The second scroll is a double-rotating scroll compressor having a second end plate and a second scroll body that is integral with the second end plate and protrudes in a spiral shape toward the first scroll, The first scroll and the second scroll constitute a scroll compression section, a pressure adjustment chamber is provided on one side of the scroll compression section in the thrust direction, into which a fluid having a suction pressure in the suction chamber, a discharge pressure in the discharge chamber, or an intermediate pressure between the suction pressure and the discharge pressure is introduced, thereby reducing a thrust load acting on the scroll compression section in the thrust direction; the suction chamber is a scroll accommodating chamber that accommodates the scroll compression section, the discharge pressure acts on the scroll compression section from the other side in the thrust direction, The fluid at the discharge pressure or the intermediate pressure is introduced into the pressure adjustment chamber, the first scroll has a first supported portion extending from the first end plate to a side opposite to the compression chamber, a cover body connected to the first end plate and facing the first end plate in the thrust direction while sandwiching the second scroll therebetween, and a second supported portion extending from the cover body to a side opposite to the compression chamber, the second scroll has a third journal portion provided on the second end plate opposite to the compression chamber, The housing includes: a first partition wall that partitions the scroll accommodating chamber while facing the first end plate in the thrust direction; and a first journal portion provided on the first partition wall; a second partition wall that partitions the scroll accommodating chamber while facing the cover body in the thrust direction, and a second journal portion that is provided on the second partition wall, Further provided is a third support portion disposed eccentrically relative to the second support portion, The first to third supported portions are supported by the first to third supporting portions via bearings, respectively. The pressure adjustment chamber is formed between the cover body and the second partition wall. A fourth double rotary scroll compressor of the present invention includes a housing having a suction chamber into which a fluid is drawn from the outside and a discharge chamber from which the fluid is discharged to the outside; a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and defining a compression chamber for compressing a fluid between the first scroll and the second scroll, the first scroll has a first end plate and a first scroll body that is integral with the first end plate and protrudes in a spiral shape toward the second scroll, The second scroll is a double-rotating scroll compressor having a second end plate and a second scroll body that is integral with the second end plate and protrudes in a spiral shape toward the first scroll, The first scroll and the second scroll constitute a scroll compression section, a pressure adjustment chamber is provided on one side of the scroll compression section in the thrust direction, into which a fluid having a suction pressure in the suction chamber, a discharge pressure in the discharge chamber, or an intermediate pressure between the suction pressure and the discharge pressure is introduced, thereby reducing a thrust load acting on the scroll compression section in the thrust direction; the suction chamber is a scroll accommodating chamber that accommodates the scroll compression section, the discharge chamber, into which the compressed fluid is discharged from the compression chamber, is disposed on the one side of the scroll compression section in the thrust direction, and a partition wall is disposed to close an opening on the one side of the discharge chamber; the discharge chamber is connected to the outside of the housing by a discharge passage extending in a direction intersecting the thrust direction, the pressure adjustment chamber is formed between an end surface of the partition wall opposite to the discharge chamber and a housing opposing surface opposing the end surface, The pressure adjusting chamber is adapted to receive fluid at the suction pressure.

[0015] In the bi-rotary scroll compressor of the present invention, for example, when a scroll compression section is housed in the suction chamber and discharge pressure acts on the scroll compression section from the other side in the thrust direction, a thrust load is generated on the scroll compression section toward one side in the thrust direction relative to the housing.Furthermore, for example, when suction pressure acts on the scroll compression section housed in the discharge chamber from the other side in the thrust direction, a thrust load is generated on the scroll compression section toward the other side in the thrust direction relative to the housing.

[0016] In this regard, in the double-rotary scroll compressor of the present invention, a pressure adjustment chamber into which a fluid of a predetermined pressure is introduced is disposed on one side of the scroll compression section in the thrust direction. The pressure of the fluid introduced into this pressure adjustment chamber acts to reduce the thrust load generated in the scroll compression section by the fluid pressure acting in the thrust direction on the scroll compression section. This reduces the thrust load applied from the scroll compression section to the housing.

[0017] Therefore, with this double-rotary scroll compressor, the thrust load applied from the scroll compression section to the housing can be reduced, thereby suppressing vibration, noise, and an increase in power consumption.

[0018] When the suction chamber is a scroll accommodating chamber that accommodates the scroll compression section, it is preferable that the discharge pressure of the discharge chamber acts on the scroll compression section from the other side in the thrust direction, and that a fluid at the discharge pressure or an intermediate pressure is introduced into the pressure adjustment chamber.

[0019] When the scroll compression section is accommodated in the suction chamber, if a fluid at the discharge pressure or intermediate pressure is introduced into the pressure adjustment chamber when the discharge pressure of the discharge chamber acts on the scroll compression section from the other side in the thrust direction, the discharge pressure or intermediate pressure of the fluid introduced into the pressure adjustment chamber can counteract the discharge pressure acting on the scroll compression section from the other side in the thrust direction. This reduces the thrust load generated on the scroll compression section by the discharge pressure acting on the scroll compression section from the other side in the thrust direction. As a result, the thrust load applied to the housing from the scroll compression section toward one side in the thrust direction can be reduced.

[0020] The first scroll may have a first bearing portion extending from the first end plate in the opposite direction from the compression chamber, a cover body connected to the first end plate facing the first end plate in the thrust direction while sandwiching the second scroll between them, and a second bearing portion extending from the cover body in the opposite direction from the compression chamber.

[0021] The second scroll may have a third journaled portion provided on the second end plate opposite the compression chamber.

[0022] The housing may further include a third supporting portion disposed eccentrically relative to the second supporting portion, the first to third supporting portions being supported by bearings, the first to third supporting portions being supported by the first to third supporting portions, respectively.

[0023] The pressure adjustment chamber is preferably formed between the second end plate and the third support portion. The pressure adjustment chamber is preferably formed between the second end plate and the second support portion. The pressure adjustment chamber is preferably formed between the cover body and the second partition wall. The pressure adjustment chamber is preferably formed between the second end plate and the third support portion, and also between the second end plate and the second support portion. The pressure adjustment chamber is preferably formed between the second end plate and the third support portion, and also between the cover body and the second partition wall.

[0024] In this case, the entire scroll compression section, which consists of the first scroll supported on both sides of the housing and the second scroll supported on one side, is supported by the first support portion, the second support portion, and the third support portion of the housing.

[0025] A pressure adjustment chamber is formed between the second end plate and the third pivotal support portion, between the second end plate and the second pivotal support portion, or between the cover body and the second partition wall. Alternatively, a pressure adjustment chamber is formed between the second end plate and the third pivotal support portion and between the second end plate and the second pivotal support portion, or a pressure adjustment chamber is formed between the second end plate and the third pivotal support portion and between the cover body and the second partition wall.

[0026] In this configuration, when the discharge pressure of the discharge chamber acts on the scroll compression section from the other side in the thrust direction, if a fluid at the discharge pressure or intermediate pressure is introduced into the pressure adjustment chamber, the discharge pressure or intermediate pressure of the fluid introduced into the pressure adjustment chamber can counteract the discharge pressure acting on the scroll compression section from the other side in the thrust direction. This reduces the thrust load generated on the scroll compression section by the discharge pressure acting on the scroll compression section from the other side in the thrust direction. As a result, the thrust load applied to the housing from the scroll compression section toward one side in the thrust direction can be reduced.

[0027] In this case, the second scroll is pressed against the first scroll in the other thrust direction by the discharge pressure or intermediate pressure of the fluid introduced into the pressure adjustment chamber, thereby improving the sealing performance between the tip of the first scroll and the second end plate and between the tip of the second scroll and the first end plate.

[0028] When the suction chamber is a scroll accommodating chamber accommodating a scroll compression section, a discharge chamber through which fluid is discharged from the compression chamber is preferably disposed on one side of the scroll compression section in the thrust direction, and a partition wall is preferably disposed to close one opening of the discharge chamber. The discharge chamber is preferably communicated with the outside of the housing by a discharge passage extending in a direction intersecting the thrust direction. The pressure adjustment chamber is preferably formed between an end face of the partition wall opposite the discharge chamber and a housing opposing surface facing the end face, and fluid at suction pressure is preferably introduced into the pressure adjustment chamber.

[0029] A discharge chamber, through which fluid is discharged from the compression chamber, is located on one side of the scroll compression section housed in the suction chamber in the thrust direction. When the discharge chamber is open in the thrust direction, a thrust load is generated in the scroll compression section toward the other side in the thrust direction due to the discharge pressure from the discharge chamber. In this regard, a pressure adjustment chamber is located via a partition wall that closes the opening on one side of the discharge chamber. Fluid at suction pressure is introduced into this pressure adjustment chamber, and the discharge chamber is connected to the outside of the housing by a discharge passage that extends in a direction intersecting the thrust direction. Therefore, no thrust load is generated in the scroll compression section due to the discharge pressure from the discharge chamber. This reduces the thrust load applied to the housing from the scroll compression section.

[0030] A thrust bearing is preferably provided between the housing and the scroll compression section.

[0031] In this case, the thrust load applied to the housing from the scroll compression section can be borne by the thrust bearing, and since the thrust load borne by this thrust bearing is reduced compared to when the pressure adjustment chamber is not provided, the increase in power due to the provision of the thrust bearing can be suppressed.

[0032] Preferably, at least one of the bearings is a plain bearing.

[0033] In this case, it is more advantageous to suppress vibration and noise than when the scroll compression section is supported on the housing by a ball bearing. [Effects of the Invention]

[0034] According to the double-rotation scroll compressor of the present invention, the thrust load applied from the scroll compression section to the housing can be reduced, thereby suppressing vibration noise and an increase in power consumption. [Brief explanation of the drawings]

[0035] [Figure 1] FIG. 1 is a cross-sectional view of a double-rotary scroll compressor according to a first embodiment. [Figure 2] FIG. 2 is a partially enlarged cross-sectional view showing a main part of the double rotary scroll compressor of the first embodiment. [Figure 3] FIG. 3 is a partially enlarged cross-sectional view showing a main part of a double rotary scroll compressor according to a second embodiment. [Figure 4] FIG. 4 is a partially enlarged cross-sectional view showing a main part of a double rotary scroll compressor according to a third embodiment. [Figure 5] FIG. 5 is a partially enlarged cross-sectional view showing a main part of a double rotary scroll compressor according to a fourth embodiment. [Figure 6] FIG. 6 is a partially enlarged cross-sectional view showing a main part of a double rotary scroll compressor according to a fifth embodiment. [Figure 7] FIG. 7 is a cross-sectional view of a double-rotating scroll compressor according to a sixth embodiment. [Figure 8]FIG. 8 is a cross-sectional view of a double-rotating scroll compressor according to a reference example. DETAILED DESCRIPTION OF THE INVENTION

[0036] Hereinafter, first to sixth embodiments of the present invention will be described with reference to the drawings.

[0037] Example 1 1, the double-rotating scroll compressor (hereinafter simply referred to as the compressor) of the first embodiment includes a housing 60, a scroll compression section 80, an electric motor 10, a driving scroll 30, a driven scroll 40, and a driven mechanism 20. This compressor is mounted on a vehicle (not shown) and constitutes an air conditioning system for the vehicle.

[0038] In this embodiment, the front-to-rear direction of the compressor is defined by the solid arrow shown in Fig. 1. Note that the front-to-rear direction is an example for convenience of explanation, and the compressor can change its own posture as appropriate depending on the vehicle in which it is installed.

[0039] In this embodiment, the driving scroll 30, a driving end plate 31 (described later), and a driving scroll 33 (described later) correspond to the "first scroll," "first end plate," and "first scroll," respectively, in the present invention. The driven scroll 40, a driven end plate 41 (described later), and a driven scroll 43 (described later) correspond to the "second scroll," "second end plate," and "second scroll," respectively, in the present invention.

[0040] The housing 60 is composed of a housing main body 61, a cover 65, and a bearing housing 67. The housing main body 61 is a bottomed cylindrical member having a first outer peripheral wall 62 and a first bottom wall 63. The first bottom wall 63 is an example of a "second partition wall" in the present invention. The first outer peripheral wall 62 is cylindrical and centered on the drive axis R1. The drive axis R1 is parallel to the front-to-rear direction. The first outer peripheral wall 62 also has an inner peripheral surface 62B. The first bottom wall 63 is located at the rear end of the housing main body 61. The first bottom wall 63 extends in a substantially circular flat plate shape, perpendicular to the drive axis R1.

[0041] The outer peripheral edge of the first bottom wall 63 is connected to the rear end of the first outer peripheral wall 62. A cylindrical second bearing portion 64 is provided at the center of the inner surface of the first bottom wall 63 so as to protrude forward.

[0042] A cylindrical third support portion 90 is disposed eccentrically relative to the second support portion 64 on a tip end surface 641 of the second support portion 64. An eccentric shaft 91 is fixed to the second support portion 64. The eccentric shaft 91 extends forward from the tip end surface 641 of the second support portion 64 parallel to the drive axis R1. The eccentric shaft 91 is eccentric relative to the drive axis R1. The third support portion 90 is attached rotatably relative to the eccentric shaft 91. A third plain bearing 73 is interposed between this third support portion 90 and a recess 74, which will be described later. As a result, the third support portion 90 is rotatable relative to the recess 74 and the eccentric shaft 91, which will be described later.

[0043] An intake communication port 61B is formed in the first outer peripheral wall 62 of the housing body 61. The intake communication port 61B is located near the rear end of the first outer peripheral wall 62 and penetrates the first outer peripheral wall 62 in a direction intersecting the drive axis R1. The intake communication port 61B connects a suction chamber 61A (described later) to the outside of the compressor. A pipe is connected to the intake communication port 61B. As a result, low-temperature, low-pressure refrigerant gas that has passed through the evaporator is drawn into the suction chamber 61A through the pipe. The refrigerant gas is an example of the "fluid" in this invention.

[0044] An inverter case provided with a connector is coupled to the rear of the housing main body 61. An inverter circuit having a circuit board, switching elements, etc. is housed inside the inverter case. The inverter circuit is electrically connected to the vehicle battery through the connector, and is also electrically connected to the stator 17 (described later) through an airtight passage provided in the first bottom wall 63. As a result, the inverter circuit converts direct current supplied from the battery into alternating current and supplies power to the stator 17. The connector, inverter case, inverter circuit, and battery are not shown in the drawings.

[0045] The bearing housing 67 is disposed in front of the housing body 61. The bearing housing 67 is an example of the "first partition wall" of the present invention. The bearing housing 67 extends in a generally circular flat plate shape perpendicular to the drive axis R1. The bearing housing 67 is fastened to the first outer peripheral wall 62 of the housing body 61 together with the cover 65 by bolts (not shown) with its outer peripheral edge abutting against the front end of the first outer peripheral wall 62 of the housing body 61. As a result, the bearing housing 67 blocks the housing body 61 from the front. In this way, a suction chamber 61A is formed within the housing body 61.

[0046] A cylindrical first bearing support portion 66 is provided in the center of the bearing housing 67, with its center on the drive axis R1. A first plain bearing 71 serving as a first bearing is fitted into the first bearing support portion 66. The first plain bearing 71 is an example of the "bearing" according to the present invention.

[0047] The cover 65 is disposed in front of the bearing housing 67. The cover 65 is a bottomed cylindrical member having a second outer peripheral wall 68 and a second bottom wall 69. The second outer peripheral wall 68 is cylindrical and centered on the drive axis R1. The second bottom wall 69 is located at the front end of the cover 65. The second bottom wall 69 extends in a substantially circular, flat plate shape, perpendicular to the drive axis R1. The outer peripheral edge of the second bottom wall 69 is connected to the front end of the second outer peripheral wall 68.

[0048] The cover 65 is fastened to the first outer peripheral wall 62 together with the bearing housing 67 by bolts (not shown) with the rear end of the second outer peripheral wall 68 abutting against the front surface of the bearing housing 67. This forms a second discharge portion 65A between the cover 65 and the bearing housing 67. The second discharge portion 65A is adjacent to the suction chamber 61A in front of the suction chamber 61A. The second discharge portion 65A is separated from the suction chamber 61A by the bearing housing 67.

[0049] A discharge communication port 65B is formed in the cover 65. The discharge communication port 65B is located near the outer periphery of the cover 65 and penetrates the cover 65 in a direction parallel to the drive axis R1. The discharge communication port 65B communicates between the second discharge portion 65A and the outside of the compressor. A pipe is connected to the discharge communication port 65B, and refrigerant gas discharged to the second discharge portion 65A flows toward the condenser. The pipes, evaporator, and condenser are not shown in the figure.

[0050] The electric motor 10 is accommodated in the suction chamber 61A. As a result, the suction chamber 61A also serves as a motor chamber that accommodates the electric motor 10. The electric motor 10 is composed of a stator 17 and a rotor 11.

[0051] The stator 17 is cylindrical and has a center on the drive axis R1, and has windings 18. The stator 17 is fitted into the inner peripheral surface 62B of the first outer peripheral wall 62 of the housing main body 61, and is thereby fixed to the housing main body 61 and, ultimately, the housing 60.

[0052] The rotor 11 is cylindrical around the drive axis R1 and is disposed inside the stator 17. Although not shown in detail, the rotor 11 is composed of a plurality of permanent magnets corresponding to the stator 17 and laminated steel plates that secure the permanent magnets.

[0053] The scroll compression section 80 is accommodated in the suction chamber 61A. As a result, the suction chamber 61A also serves as a scroll accommodating chamber that accommodates the scroll compression section 80. In other words, the suction chamber 61A is an example of the "scroll accommodating chamber" of the present invention. The scroll compression section 80 is composed of a driving scroll 30 and a driven scroll 40.

[0054] The driving scroll 30 has a driving end plate 31 , a driving peripheral wall 32 , a driving scroll 33 , a bearing cover body 34 and a cover body 35 .

[0055] The drive end plate 31 has a generally circular plate shape and extends perpendicular to the drive axis R1. The drive end plate 31 has a front surface 311 and a rear surface 312 located on the opposite side of the front surface 311.

[0056] A discharge valve chamber 36 is formed in a front surface 311 of the drive end plate 31. The discharge valve chamber 36 is formed by a recess in the front surface 311 that is partially recessed toward a compression chamber 55 (described later). The discharge valve chamber 36 has an inner shape that roughly corresponds to the outer shape of the discharge valve mechanism 56 (described later) so that it can accommodate the discharge valve mechanism 56. A discharge port 37 that penetrates the drive end plate 31 in the front-rear direction is formed near the center of the drive end plate 31. One end of the discharge port 37 opens to the compression chamber 55 (described later), and the other end opens to the bottom surface of the discharge valve chamber 36, so that the compression chamber 55 and the discharge valve chamber 36 communicate with each other. The discharge port 37 is located near the drive axis R1.

[0057] A discharge valve mechanism 56 is disposed within the discharge valve chamber 36. The discharge valve mechanism 56 has a discharge reed valve 57, a retainer 58, and a fixing bolt 59. The discharge reed valve 57 and the retainer 58 are fixed to the bottom surface of the discharge valve chamber 36 by the fixing bolt 59. The discharge reed valve 57 is capable of opening and closing the discharge port 37. The retainer 58 is also capable of adjusting the opening degree of the discharge reed valve 57. In the discharge reed valve 57, the tip valve portion that opens and closes the discharge port 37 is disposed closer to the drive axis R1 than the base end fixed portion that is fixed by the fixing bolt 59.

[0058] The drive spiral 33 is formed integrally with the drive end plate 31 and is located inside the drive peripheral wall 32. The drive spiral 33 extends rearward from the rear surface 312 of the drive end plate 31 in parallel with the drive axis R1. The drive spiral 33 forms a spiral shape around the drive axis R1. More specifically, when viewed from the front, the drive spiral 33 is formed in a clockwise spiral around the drive axis R1 from the spiral center.

[0059] The driving circumferential wall 32 is composed of the rotor 11 disposed on the outer peripheral edge of the rear surface 312 of the driving end plate 31 and a cylindrical portion 51 (described later) of the cover body 35 disposed behind the rotor 11. The driving circumferential wall 32 extends rearward from the outer peripheral edge of the driving end plate 31, i.e., toward the driven scroll 40, in parallel with the driving axis R1. The driving circumferential wall 32 is substantially cylindrical and centered on the driving axis R1.

[0060] The cover body 35 is a bottomed cylindrical member having a cylindrical portion 51 and a bottom wall portion 52. The cylindrical portion 51 has a cylindrical shape centered on the drive axis R1. The bottom wall portion 52 is located at the rear end of the cover body 35. The bottom wall portion 52 extends in a substantially circular flat plate shape perpendicular to the drive axis R1.

[0061] The outer peripheral edge of the bottom wall portion 52 is connected to the rear end of the cylindrical portion 51. A second boss 53 is provided in the center of the bottom wall portion 52, protruding rearward. The second boss 53 is an example of a "second supported portion" in the present invention. A second plain bearing 72 serving as a second bearing is fitted into the second boss 53. The second plain bearing 72 is an example of a "bearing" in the present invention. The second boss 53 extends cylindrically in the direction of the drive axis R1, centered on the drive axis R1.

[0062] An intake port 54 is formed near the outer periphery of the bottom wall portion 52. The intake port 54 is formed in a generally elliptical shape extending in the circumferential direction of the cover body 35. The intake port 54 penetrates the bottom wall portion 52 in the direction of the drive axis R1, i.e., in the front-to-rear direction. The shape and number of the intake ports 54 can be designed as appropriate.

[0063] The bearing cover body has a cover portion and a first boss 39 formed integrally with the cover portion .

[0064] The cover portion 38 extends in a generally circular plate shape perpendicular to the drive axis R1. The cover portion 38 has a front surface 381 and a rear surface 382 located opposite the front surface 381. A through hole 38A is formed in the center of the cover portion 38.

[0065] The first boss 39 protrudes forward from the inner peripheral edge of the cover portion 38, i.e., from the center of the front surface 381 of the cover portion 38. The first boss 39 is an example of the "first supported portion" of the present invention. The first boss 39 extends cylindrically in the direction of the drive axis R1, centered on the drive axis R1. The cylindrical internal space of the first boss 39 constitutes a first discharge portion 39A. The inner diameter of the first discharge portion 39A, which is the cylindrical internal space of the first boss 39, and the outer diameter of the first boss 39 are shorter than the length of the longest portion of the discharge valve mechanism 56. In this compressor, the discharge valve chamber 36, the first discharge portion 39A, and the second discharge portion 65A constitute a discharge chamber.

[0066] A disk-shaped gasket (not shown) is disposed between the rear surface 382 of the cover portion 38 and the front surface 311 of the drive end plate 31. A communication hole having a diameter equal to the inner diameter of the first boss 39 is formed in the center of the gasket. The gasket is sandwiched between the front surface 311 of the drive end plate 31 and the rear surface 382 of the cover portion 38, sealing the gap between them.

[0067] The cover portion 38 of the bearing cover body 34, a gasket (not shown), the drive end plate 31 of the drive scroll 30, the rotor 11, and the cylindrical portion 51 of the cover body 35 are fastened together with a plurality of bolts 50 extending parallel to the drive axis R1. These members are joined with the bolts 50 after the driven mechanism 20 and the driven scroll 40 have been set on the cover body 35 and the discharge valve mechanism 56 has been set on the drive end plate 31.

[0068] The driven scroll 40 has a driven end plate 41 and a driven scroll 43 .

[0069] The driven end plate 41 extends in a generally circular plate shape, perpendicular to the driven axis R2. The driven axis R2 extends parallel to the drive axis R1 while being eccentric with respect to the drive axis R1. In other words, the driven axis R2 is also parallel to the front-to-rear direction. The directions of the drive axis R1 and the driven axis R2, i.e., the front-to-rear direction, coincide with the thrust direction. In this embodiment, the front corresponds to the "other side in the thrust direction" in this invention, and the rear corresponds to the "one side in the thrust direction" in this invention. The driven end plate 41 has a front surface 411 and a rear surface 412 located opposite the front surface 411.

[0070] As shown in FIG. 2, a cylindrical recess 74 with a bottom is formed on the rear surface 412 of the driven end plate 41, partially recessed from the center of the driven end plate 41 toward the compression chamber 55. The recess 74 is an example of the "third supported portion" of the present invention. The recess 74 extends cylindrically in the direction of the driven axis R2, centered on the driven axis R2. The recess 74 has an inner shape that corresponds to the outer shape of the third support portion 90.

[0071] A first pressure adjustment chamber 76 is formed between a bottom surface 75 of the recess 74 and a tip surface 92 of the third pivot support portion 90, and is defined by the bottom surface 75 and the tip surface 92. The first pressure adjustment chamber 76 is an example of the "pressure adjustment chamber" of the present invention.

[0072] A third plain bearing 73 serving as a third bearing is fitted into the inner peripheral surface of the recess 74. The third plain bearing 73 is an example of the "bearing" in the present invention.

[0073] Furthermore, a first seal ring 93 is disposed behind the first pressure adjustment chamber 76, between the inner circumferential surface of the recess 74 and the outer circumferential surface of the third journal portion 90. The first seal ring 93 is inserted into an annular groove recessed into the outer circumferential surface of the third journal portion 90, and seals the gap between the inner circumferential surface of the recess 74 and the outer circumferential surface of the third journal portion 90. The first seal ring 93 is disposed in front of the third plain bearing 73.

[0074] A first communication passage 77 is formed near the center of the driven end plate 41, penetrating the driven end plate 41 in the front-to-rear direction. One end of the first communication passage 77 opens to the compression chamber 55, and the other end of the first communication passage 77 opens to the bottom surface 75 of the recess 74, so that the first communication passage 77 communicates between the compression chamber 55 and the first pressure adjustment chamber 76. The first communication passage 77 is disposed near the driven axis R2.

[0075] The driven scroll 43 is formed integrally with the driven end plate 41 and extends parallel to the driven axis R2 from the front surface 411 of the driven end plate 41 forward, i.e., toward the drive end plate 31 of the drive scroll 30. The driven scroll 43 is spiral-shaped around the driven axis R2. More specifically, when viewed from the front, the driven scroll 43 is formed in a clockwise spiral around the driven axis R2 from the center of the spiral.

[0076] The driven mechanism 20 is composed of four rotation-preventing pins 21 and four rings 22. The number of rotation-preventing pins 21 and rings 22 can be appropriately designed as long as there are three or more of each. Also, in Figure 1, two of each of the rotation-preventing pins 21 and rings 22 are shown.

[0077] Each rotation-preventing pin 21 is inserted through and fixed to the rear surface 412 of the driven end plate 41. As a result, each rotation-preventing pin 21 is fixed to the driven end plate 41 in a state where it protrudes rearward beyond the driven end plate 41.

[0078] Each ring 22 is provided on the front surface 521 of the bottom wall portion 52 of the cover body 35 of the drive scroll 30 so as to face each rotation-preventing pin 21. Each ring 22 is fitted into a circular, bottomed hole recessed in the front surface 521 of the bottom wall portion 52.

[0079] In this compressor, a scroll compression section 80 consisting of a driving scroll 30 and a driven scroll 40 is disposed in a suction chamber 61A. That is, the suction chamber 61A corresponds to the "scroll accommodating chamber" in the present invention.

[0080] In the driving scroll 30, the rotor 11 is integrated with the driving peripheral wall 32. In the driving scroll 30, a first plain bearing 71 is interposed between the first journal portion 66 of the bearing housing 67 and the first boss 39 of the bearing cover body 34, and a second plain bearing 72 is interposed between the second journal portion 64 of the first bottom wall 63 and the second boss 53 of the cover body 35. As a result, the driving scroll 30 is supported by the housing 60 so as to be rotatable around the drive axis R1. Here, in this compressor, the driving scroll 30 is supported by the housing 60 in a so-called doubly supported state.

[0081] Meanwhile, the driven scroll 40 is disposed within the driving scroll 30 behind the driving end plate 31 with the driven scroll 43 facing the driving end plate 31. As a result, the rear surface 312 of the driving end plate 31 and the front surface 411 of the driven end plate 41 face each other in the directions of the drive axis R1 and the driven axis R2. The driving scroll 30 and the driven scroll 40 mesh with each other inside the driving peripheral wall 32, and each rotation-preventing pin 21 enters each ring 22. In this manner, the driven scroll 40 is assembled within the driving scroll 30 with the driving end plate 31 and the driven end plate 41 facing each other in the front-to-rear direction. The driving scroll 33 and the driven scroll 43 form a compression chamber 55 therebetween.

[0082] In the driven scroll 40, a third sliding bearing 73 is interposed between a third journal portion 90, which is disposed eccentrically with respect to the second journal portion 64 of the first bottom wall 63, and a recess 74 of the driven end plate 41. This allows the driven scroll 40 to be supported by the housing 60 rotatably about the driven axis R2. Here, in this compressor, the driven scroll 40 is supported by the housing 60 in a so-called cantilevered state.

[0083] In the compressor configured as described above, an inverter circuit (not shown) supplies power to the stator 17 and controls the operation of the electric motor 10, thereby operating the electric motor 10. This causes the rotor 11 to rotate, which drives the driving scroll 30 to rotate about the driving axis R1 within the suction chamber 61A. In other words, the driving scroll 30, which integrally includes the rotor 11 in the driving peripheral wall 32, is driven to rotate. At this time, in the driven mechanism 20, each rotation-preventing pin 21 slides against the inner circumferential surface of each ring 22, causing the rings 22 to rotate relatively about the center of each rotation-preventing pin 21. In this way, the driven mechanism 20 transmits the torque of the driving scroll 30 to the driven scroll 40.

[0084] As a result, the driven scroll 40 is rotated around the driven axis R2 by the driving scroll 30 and the driven mechanism 20. At this time, the driven mechanism 20 restricts the rotation of the driven scroll 40. As a result, the driving scroll 30 and the driven scroll 40 rotate and are rotated, and the driven scroll 40 revolves around the drive axis R1 relative to the driving scroll 30, thereby changing the volume of the compression chamber 55.

[0085] As a result, refrigerant gas in suction chamber 61A is drawn into compression chamber 55 through suction port 54 and compressed there. The refrigerant gas compressed to discharge pressure in compression chamber 55 is then discharged from discharge port 37 to discharge valve chamber 36, passes through first discharge portion 39A to second discharge portion 65A, and is further discharged from discharge communication port 65B to the condenser. In this manner, air conditioning is performed by the automotive air conditioner.

[0086] In this compressor, the scroll compression section 80 is housed in the suction chamber 61A, and during operation of the compressor, the discharge pressure of the discharge chamber acts on the scroll compression section 80 from the other side of the thrust direction, i.e., from the front. As a result, a thrust load is generated in the scroll compression section 80 in one side of the thrust direction relative to the housing 60, i.e., backward.

[0087] In this regard, in the compressor of the first embodiment, a first pressure adjustment chamber 76 is disposed rearward of the compression chamber 55 in the scroll compression section 80. Refrigerant gas at the discharge pressure of the compression chamber 55 is introduced into the first pressure adjustment chamber 76 via a first communication passage 77. The discharge pressure of the refrigerant gas introduced into the first pressure adjustment chamber 76 counters the discharge pressure acting on the scroll compression section 80 from the discharge chamber located in front of it. That is, the discharge pressure of the refrigerant gas introduced into the first pressure adjustment chamber 76 acts to reduce the rearward thrust load of the scroll compression section 80 against the third journal portion 90 of the housing 60. This reduces the thrust load applied to the housing 60 from the scroll compression section 80.

[0088] Therefore, according to the double-rotating scroll compressor of the first embodiment, the thrust load applied from the scroll compression section 80 to the housing 60 can be reduced, and vibration noise and an increase in power consumption can be suppressed.

[0089] Furthermore, in this compressor, the discharge pressure of the refrigerant gas introduced into the first pressure adjustment chamber 76 presses the driven scroll 40 in the other thrust direction, i.e., forward, relative to the driving scroll 30. This improves the sealing performance between the tip of the driving scroll 33 and the front surface 411 of the driven end plate 41 and between the tip of the driven scroll 43 and the rear surface 312 of the driving end plate 31, thereby contributing to improved compression efficiency.

[0090] Furthermore, in this compressor, the thrust load applied from the scroll compression section 80 to the housing 60 is reduced on the rear side of the compression chamber 55 in the scroll compression section 80, so there is no need to bear a large thrust load on the rear side of the scroll compression section 80. For this reason, on the rear side of the scroll compression section 80, a second plain bearing 72 is employed as the second bearing that supports the second boss 53 of the drive scroll 30, and a third plain bearing 73 is employed as the third bearing that supports the recess 74 of the driven scroll 40. This is more advantageous in suppressing vibration and noise than when ball bearings are used.

[0091] Furthermore, in this compressor, in the driving scroll 30, a bearing cover body 34 having a cover portion 38 that covers part of the discharge valve chamber 36 and part of the discharge valve mechanism 56 is coupled to the front surface 311 of the driving end plate 31 in which the discharge valve chamber 36 that houses the discharge valve mechanism 56 is recessed. A first discharge portion 39A, which is the internal space of a first boss 39 of the bearing cover body 34, is connected to the discharge valve chamber 36.

[0092] With this configuration, in this compressor, the discharge valve mechanism 56 is not housed in the first discharge portion 39A, which is the internal space of the first boss 39, and therefore there is no need to make the inner diameter of the first discharge portion 39A larger than the discharge valve mechanism 56. For this reason, in this compressor, the inner diameter of the first discharge portion 39A and the outer diameter of the first boss 39 are shorter than the length of the longest part of the discharge valve mechanism 56. This makes it possible to reduce the size of the first plain bearing 71 attached to the outer peripheral surface of the first boss 39.

[0093] Example 2 3, the compressor of the second embodiment is configured such that a second pressure adjustment chamber 79 is formed in addition to the first pressure adjustment chamber 76 in the compressor of the first embodiment. The second pressure adjustment chamber 79 is an example of the "pressure adjustment chamber" of the present invention.

[0094] That is, a first annular recess 78 is formed on the rear surface 412 of the driven end plate 41 around the outer periphery of the recess 74, recessing in an annular shape from the rear surface 412 toward the compression chamber 55. The inner peripheral end of the first annular recess 78 is connected to the rear end of the recess 74, and the recess 74 and the first annular recess 78 are continuous.

[0095] Furthermore, a second seal ring 94 is disposed on the outer periphery of the first annular recess 78, between the driven end plate 41 and the cover body 35. The second seal ring 94 is inserted into an annular groove recessed in the rear surface 412 of the driven end plate 41, and provides a seal between the rear surface 412 of the driven end plate 41 and the front surface 521 of the bottom wall portion 52 of the cover body 35. Furthermore, a fourth seal ring 99 is disposed between the second boss 53 and the first bottom wall 63. The fourth seal ring 99 is inserted into an annular groove recessed in the front surface 531 of the second boss 53, and provides a seal between the front surface 531 of the second boss 53 and the front surface 631 of the first bottom wall 63. This compressor does not have the first seal ring 93 disposed in front of the third plain bearing 73 in the compressor of the first embodiment.

[0096] As a result, in addition to the first pressure adjustment chamber 76 formed between the bottom surface 75 of the recess 74 and the tip surface 92 of the third support portion 90, a second pressure adjustment chamber 79 is also formed between the bottom surface of the first annular recess 78 and the tip surface 641 of the second support portion 64 and the front surface 521 of the bottom wall portion 52 of the cover body 35.

[0097] In the compressor of the second embodiment, a first pressure adjustment chamber 76 and a second pressure adjustment chamber 79 are arranged rearward of the compression chamber 55 in the scroll compression section 80. Refrigerant gas at the discharge pressure of the compression chamber 55 is introduced into the first pressure adjustment chamber 76 via a first communication passage 77. Furthermore, the refrigerant gas at the discharge pressure introduced into the first pressure adjustment chamber 76 is introduced into the second pressure adjustment chamber 79 via a gap between the third journal portion 90 and the recess 74 and through a gap in the third plain bearing 73.

[0098] As a result, the discharge pressure of the refrigerant gas introduced into the first pressure adjustment chamber 76 and the second pressure adjustment chamber 79 counters the discharge pressure acting on the scroll compression section 80 from the discharge chamber in front of it. That is, the discharge pressure of the refrigerant gas introduced into the first pressure adjustment chamber 76 and the second pressure adjustment chamber 79 acts to reduce the rearward thrust load of the scroll compression section 80 on the third journal portion 90 and the second journal portion 64 of the housing 60. As a result, the thrust load acting on the housing 60 from the scroll compression section 80 is reduced.

[0099] Other configurations and operations of this compressor are the same as those of the compressor of the first embodiment, and the same components are given the same reference numerals and detailed description of the configurations will be omitted.

[0100] Example 3 As shown in FIG. 4, in the compressor of the third embodiment, a second pressure adjustment chamber 79 is formed instead of the first pressure adjustment chamber 76 in the compressor of the first embodiment.

[0101] That is, similar to the compressor of Example 2, a first annular recess 78 is formed in the rear surface 412 of the driven end plate 41, a second seal ring 94 is disposed on the outer periphery of the first annular recess 78, and a fourth seal ring 99 is disposed between the second boss 53 and the first bottom wall 63. In this compressor, similar to the compressor of Example 1, a first seal ring 93 is provided in front of the third plain bearing 73.

[0102] Furthermore, this compressor does not have the first communication passage 77 that opens to the bottom surface 75 of the recessed portion 74 in the compressor of the first embodiment. Instead, a second communication passage 95 is formed that penetrates the driven end plate 41 in a direction oblique to the front-to-rear direction. The rear end of the second communication passage 95 opens to the bottom surface of the first annular recessed portion 78, and the front end of the second communication passage 95 opens to the compression chamber 55. The open end of the second communication passage 95 that faces the compression chamber 55 is located near the drive shaft center R1.

[0103] As a result, a second pressure adjustment chamber 79 is formed between the bottom surface of the first annular recess 78 and the tip surface 641 of the second pivot support portion 64 and the front surface 521 of the bottom wall portion 52 of the cover body 35.

[0104] In the compressor of the third embodiment, a second pressure adjustment chamber 79 is arranged rearward of the compression chamber 55 in the scroll compression section 80. Refrigerant gas at the discharge pressure of the compression chamber 55 is introduced into the second pressure adjustment chamber 79 via a second communication passage 95.

[0105] As a result, the discharge pressure of the refrigerant gas introduced into the second pressure adjustment chamber 79 counters the discharge pressure acting on the scroll compression section 80 from the discharge chamber in front of it. That is, the discharge pressure of the refrigerant gas introduced into the second pressure adjustment chamber 79 acts to reduce the rearward thrust load of the scroll compression section 80 against the second journal portion 64 of the housing 60. As a result, the thrust load acting on the housing 60 from the scroll compression section 80 is reduced.

[0106] Other configurations and operations of this compressor are the same as those of the compressor of the first embodiment, and the same components are given the same reference numerals and detailed description of the configurations will be omitted.

[0107] Example 4 5, in the compressor of the fourth embodiment, a third pressure adjustment chamber 96 is formed in addition to the first pressure adjustment chamber 76 in the compressor of the first embodiment. The third pressure adjustment chamber 96 is an example of the "pressure adjustment chamber" in the present invention.

[0108] That is, a second annular recess 97 is formed on the inner peripheral side of the tip end surface 531 of the second boss 53. The second annular recess 97 is annularly recessed from the tip end surface 531 toward the compression chamber 55. A third seal ring 98 is disposed rearward of the second plain bearing 72, and a fourth seal ring 99 is disposed on the outer periphery of the second annular recess 97.

[0109] The third seal ring 98 is inserted into an annular groove recessed in the outer peripheral surface of the second journal portion 64, behind the second plain bearing 72, and seals the gap between the outer peripheral surface of the second journal portion 64 and the inner peripheral surface of the second boss 53. The fourth seal ring 99 is inserted into an annular groove recessed in the tip end surface 531 of the second boss 53, on the outer periphery of the second annular recess 97, and seals the gap between the tip end surface 531 of the second boss 53 and the front surface 631 of the first bottom wall 63. In this compressor, as in the compressor of the first embodiment, a first seal ring 93 is provided in front of the third plain bearing 73.

[0110] Furthermore, a third communication passage 81 penetrating in the front-rear direction is formed in the eccentric shaft 91, and a fourth communication passage 82 is formed in the second journal portion 64. One end of the fourth communication passage 82 is connected to the rear end of the third communication passage 81, and the other end of the fourth communication passage 82 opens to the outer peripheral surface near the rear end of the second journal portion 64. The third communication passage 81 and the fourth communication passage 82 communicate between the first pressure adjustment chamber 76 and the third pressure adjustment chamber 96.

[0111] As a result, in addition to the first pressure adjustment chamber 76 formed between the bottom surface 75 of the recess 74 and the tip surface 92 of the third journal portion 90, a third pressure adjustment chamber 96 is also formed between the tip surface 531 of the second boss 53 of the cover body 35 and the front surface 631 of the first bottom wall 63. The third pressure adjustment chamber 96 is an example of the "pressure adjustment chamber" according to the present invention.

[0112] In the compressor of the fourth embodiment, a first pressure adjustment chamber 76 and a third pressure adjustment chamber 96 are arranged rearward of the compression chamber 55 in the scroll compression section 80. Refrigerant gas at the discharge pressure of the compression chamber 55 is introduced into the first pressure adjustment chamber 76 via a first communication passage 77. Furthermore, the discharge pressure of the refrigerant gas introduced into the first pressure adjustment chamber 76 is introduced into the third pressure adjustment chamber 96 via a third communication passage 81 and a fourth communication passage 82.

[0113] As a result, the discharge pressure of the refrigerant gas introduced into the first pressure adjustment chamber 76 and the third pressure adjustment chamber 96 counters the discharge pressure acting on the scroll compression section 80 from the discharge chamber in front. That is, the discharge pressure of the refrigerant gas introduced into the first pressure adjustment chamber 76 and the third pressure adjustment chamber 96 acts to reduce the rearward thrust load of the scroll compression section 80 on the third journal portion 90 and the first bottom wall 63 of the housing 60. As a result, the thrust load acting on the housing 60 from the scroll compression section 80 is reduced.

[0114] Furthermore, in this compressor, the discharge pressure of the refrigerant gas introduced into the third pressure adjustment chamber 96 does not press the driven scroll 40 forward relative to the driving scroll 30. This makes it possible to prevent damage to the tip of the driving scroll 33 and the tip of the driven scroll 43.

[0115] Other configurations and operations of this compressor are the same as those of the compressor of the first embodiment, and the same components are given the same reference numerals and detailed description of the configurations will be omitted.

[0116] Example 5 As shown in FIG. 6, in the compressor of the fifth embodiment, a thrust bearing 83 is provided between the housing 60 and the scroll compression section 80 in the compressor of the fourth embodiment.

[0117] That is, the thrust bearing 83 is provided between the tip end surface 531 of the second boss 53 and the front surface 631 of the first bottom wall 63. The thrust bearing 83 is disposed on the outer periphery of the fourth seal ring 99.

[0118] As a result, the thrust load applied from the scroll compression section 80 to the first bottom wall 63 can be borne by the thrust bearing 83. In this compressor, the thrust load applied from the thrust compression section 80 to the housing 60 is reduced by the action of the first pressure adjustment chamber 76 and the third pressure adjustment chamber 96, so that the thrust load borne by the thrust bearing 83 can be reduced and an increase in power due to the provision of the thrust bearing 83 can be suppressed.

[0119] Other configurations and operations of this compressor are the same as those of the compressor of the fourth embodiment, and the same components are designated by the same reference numerals, and detailed description of the configurations will be omitted.

[0120] Example 6 7, in the compressor of the sixth embodiment, in the compressor of the first embodiment, a disk-shaped partition wall 84 is fixed to the tip of the first boss 39 by a bolt (not shown), and the front open end of the first discharge portion 39A is closed by the partition wall 84. In this embodiment, the second discharge portion 65A in the compressor of the first embodiment is not formed, and the discharge valve chest 36 and the first discharge portion 39A form a discharge chamber, and the front side corresponds to "one side in the thrust direction" in the present invention.

[0121] In this compressor, a thick plate cover 86 is used instead of the cover 65 and bearing housing 67 in the compressor of the first embodiment. The housing 60 is composed of a housing main body 61 and the thick plate cover 86. The thick plate cover 86 is an example of the "first partition wall" in the present invention.

[0122] The thick plate cover 86 is a thick, generally disc-shaped member. The thick plate cover 86 is fastened to the first outer peripheral wall 62 of the housing main body 61 with bolts (not shown) with its outer peripheral edge abutting against the front end of the first outer peripheral wall 62 of the housing main body 61. As a result, the thick plate cover 86 closes the housing main body 61 from the front. In this way, a suction chamber 61A is formed within the housing main body 61. In this compressor, the thick plate cover 86, which serves as a first partition wall, separates the suction chamber 61A from the outside of the housing 60.

[0123] A discharge communication port 86A is formed on the outer periphery of the thick plate cover 86. The discharge communication port 86A opens in a direction perpendicular to the drive axis R1. The thick plate cover 86 also has a sixth communication passage 86B formed therein, which extends in a direction perpendicular to the drive axis R1 and has one end connected to the discharge communication port 86A and the other end connected to a cylindrical recess 87 (described later).

[0124] A cylindrical recess 87 is formed in the center of the rear surface 861 of the thick plate cover 86, in an area corresponding to the partition plate 84, recessed forward from the rear surface 861. An expanded diameter recess 87A is formed at the rear end of the cylindrical recess 87, where the inner diameter of the cylindrical recess 87 is expanded. The expanded diameter recess 87A is an example of a "first bearing support portion" in the present invention. A first plain bearing 71 serving as a first bearing is fitted into the expanded diameter recess 87A. The first plain bearing 71 is an example of a "bearing" in the present invention.

[0125] A fourth pressure adjustment chamber 88 is formed between a front surface 841 of the partition wall 84 and a bottom surface 871 of the cylindrical recess 87 facing the front surface 841 in the front-rear direction. The fourth pressure adjustment chamber 88 is an example of a "pressure adjustment chamber" in the present invention. The front surface 841 of the partition plate 84 is an example of an "end surface of the partition wall opposite the discharge chamber" in the present invention. The bottom surface 871 of the cylindrical recess 87 is an example of a "housing-facing surface facing the end surface" in the present invention.

[0126] A fifth communication passage 85 is formed in the peripheral wall on the tip side of the first boss 39, penetrating the peripheral wall in a direction perpendicular to the drive axis R1. This fifth communication passage 85 communicates with a sixth communication passage 86B provided in the thick plate cover 86. As a result, the first discharge portion 39A and the outside of the housing 60 communicate with each other via the fifth communication passage 85 and the sixth communication passage 86B. The fifth communication passage 85 and the sixth communication passage 86B are an example of the "discharge passage" according to the present invention.

[0127] Further, the thick plate cover 86 is formed with a seventh communication passage 89 that extends obliquely relative to the front-rear direction and that connects the fourth pressure adjustment chamber 88 and the suction chamber 61A.

[0128] In this compressor, in the scroll compression section 80 housed in the suction chamber 61A, the discharge valve chamber 36 through which refrigerant gas is discharged from the compression chamber 55 and the first discharge section 39A are arranged on the front side of the compression chamber 55. Therefore, if the front side of the first discharge section 39A is opened and the area beyond it is under discharge pressure, a thrust load is generated rearward in the scroll compression section 80 due to the discharge pressure acting from the front.

[0129] In this regard, in this compressor, the front opening of the first discharge section 39A is closed by a partition wall 84, and a fourth pressure adjustment chamber 88 is disposed in front of the partition wall 84. Refrigerant gas at suction pressure is introduced into the fourth pressure adjustment chamber 88 from the suction chamber 61A via a seventh communication passage 89. The refrigerant gas discharged to the first discharge section 39A is then discharged to the outside of the housing 60 via a fifth communication passage 85 and a sixth communication passage 86B that extend in a direction intersecting the thrust direction. As a result, suction pressure acts on the scroll compression section 80 from both the front and rear in the front-to-rear direction, which is the thrust direction.

[0130] Therefore, even when refrigerant gas is discharged from the compression chamber 55 to the discharge valve chamber 36 and the first discharge section 39A located in front of it, no thrust load is generated in the scroll compression section 80 due to the discharge pressure from the first discharge section 39A. As a result, the thrust load applied from the scroll compression section 80 to the housing 60 can be reduced.

[0131] The present invention has been described above in accordance with Examples 1 to 6, but it goes without saying that the present invention is not limited to the above Examples 1 to 6 and can be modified and applied as appropriate within the scope of the invention.

[0132] For example, in the compressors of Examples 1 to 6, the scroll compression section 80 is accommodated in the suction chamber 61A, and the suction chamber 61A serves as a scroll accommodating chamber. However, the present invention is not limited to this, and a configuration may be adopted in which suction pressure acts on the scroll compression section accommodated in the discharge chamber serving as a scroll accommodating chamber from the other side in the thrust direction, and fluid at the suction pressure is introduced into a pressure adjustment chamber arranged on one side in the thrust direction.

[0133] Furthermore, in the compressors of Examples 1 to 6, the driving scroll 30 is supported in a doubly-supported state relative to the housing 60, and the driven scroll 40 is supported in a cantilevered state. However, this is not limiting, and both the driving scroll 30 and the driven scroll 40 may be supported in a cantilevered state relative to the housing 60. Furthermore, when both the driving scroll 30 and the driven scroll 40 are supported in a cantilevered state relative to the housing 60, the discharge valve mechanism 56 may be provided in the driven scroll 40 instead of the driving scroll 30, and a pressure adjustment chamber may be provided between the driving scroll 30 and the housing 60.

[0134] In the compressors of Examples 1 to 5, fluid at discharge pressure is introduced from compression chamber 55 into the pressure adjustment chamber, but this is not limiting, and fluid at an intermediate pressure between suction pressure and discharge pressure during compression may be introduced into the pressure adjustment chamber. Furthermore, fluid at discharge pressure or intermediate pressure may be discharged from compression chamber 55 through the discharge chamber to the outside of housing 60, and then returned into housing 60 via a separately provided pipe or the like, and introduced into the pressure adjustment chamber.

[0135] In the compressors of Examples 1 to 5, bearing housing 67 as a first partition wall separates suction chamber 61A from second discharge section 65A as a discharge chamber, but this is not limited to this. For example, in the compressors of Examples 1 to 5, second discharge section 65A may be omitted and first discharge section 39A may be directly connected to discharge communication port 65B, thereby separating suction chamber 61A from the outside of housing 60 by the first partition wall.

[0136] In the compressors of Examples 2 and 3, the second pressure adjustment chamber 79 is formed between the bottom surface of the first annular recess 78 and the tip surface 641 of the second journal portion 64 and the front surface 521 of the bottom wall portion 52 of the cover body 35, but this is not limited to this, and the second pressure adjustment chamber 79 may be formed only between the bottom surface of the first annular recess 78 and the tip surface 641 of the second journal portion 64.

[0137] In the compressors of Examples 1 to 6, the suction port 54 is formed in the cover body 35 of the driving scroll 30. However, this is not limiting, and the suction port 54 may be formed in the driving end plate 31 of the driving scroll. In a compressor in which both the driving scroll 30 and the driven scroll 40 are supported in a cantilevered manner by the housing 60, the suction port may be formed in either the driving end plate 31 or the driven end plate 41.

[0138] In the compressors of Examples 1 to 6, in the driving scroll 30, a bearing cover body 34 having a cover portion 38 that covers part of the discharge valve chamber 36 and part of the discharge valve mechanism 56 is coupled to a front surface 311 of a driving end plate 31 in which a discharge valve chamber 36 that houses a discharge valve mechanism 56 is recessed. A first discharge portion 39A, which is the internal space of a first boss 39 of the bearing cover body 34, is connected to the discharge valve chamber 36. However, this is not limiting, and the bearing cover body may be omitted, and the discharge valve mechanism may be housed in a boss that protrudes integrally from the driving end plate or the driven end plate, and a bearing may be attached to the boss.

[0139] In the compressors of Examples 1 to 6, all of the first to third bearings are sliding bearings, but this is not limiting, and at least one of the first to third bearings may be a rolling bearing.

[0140] In the compressor of Example 5, a thrust bearing 83 is provided between the tip surface 531 of the second boss 53 and the front surface 631 of the first bottom wall 63, but this is not limited to this. For example, a thrust bearing may be arranged in another location where a thrust load is applied, such as between the tip surface 92 of the third journal portion 90 and the bottom surface 75 of the recess 74, or between the bearing cover body 34 of the drive scroll 30 and the first journal portion 66.

[0141] In the compressors of Examples 1 to 6, the driven mechanism 20 is composed of a rotation-preventing pin 21 and a ring 22. However, the driven mechanism 20 is not limited to this, and may be composed of a pin-ring-pin system in which two pins are in sliding contact with the inner peripheral surface of one free ring, a pin-pin system in which the outer peripheral surfaces of two pins are in sliding contact with each other, a system using an Oldham coupling, or the like.

[0142] In the compressors of Examples 1 to 6, the driving scroll 30 and the rotor 11 are integrated by integrating the rotor 11 with the driving peripheral wall 32. However, this is not limiting, and the driving scroll 30 and the rotor 11 may be connected to each other by a drive shaft so that power can be transmitted, and the driving scroll 30 and the rotor 11 may be arranged apart from each other in the direction of the drive axis R1.

[0143] (Reference example) A compressor of a reference example is shown in Figure 8. The compressor of the reference example does not have the fourth pressure adjustment chamber 88 in front of the partition wall 84 in the compressor of embodiment 6. Accordingly, the seventh communication passage 89 in the compressor of embodiment 6 is also not provided.

[0144] In this compressor, similar to the compressor of the sixth embodiment, the front opening of first discharge portion 39A is closed by partition wall 84, and first discharge portion 39A is in communication with the outside of housing 60 via fifth communication passage 85 and sixth communication passage 86B. A front surface 841 of partition wall 84 abuts against a bottom surface 871 of cylindrical recess 87. Note that partition wall 84 may be omitted, and the front opening of first discharge portion 39A may be closed by bottom surface 871 of cylindrical recess 87.

[0145] In this compressor, refrigerant gas discharged from the compression chamber 55 to the discharge valve chamber 36 and the first discharge port 39A is discharged to the outside of the housing 60 via the fifth communication passage 85 and the sixth communication passage 86B.

[0146] Therefore, no thrust load is generated on the scroll compressor 80 by the discharge pressure from the first discharge portion 39A, and as a result, the thrust load applied from the scroll compressor 80 to the housing 60 can be reduced.

[0147] (Appendix 1) a housing having a suction chamber into which fluid is drawn from the outside and a discharge chamber from which the fluid is discharged to the outside; a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and defining a compression chamber for compressing a fluid between the first scroll and the second scroll, the first scroll has a first end plate and a first scroll body that is integral with the first end plate and protrudes in a spiral shape toward the second scroll, The second scroll is a double-rotating scroll compressor having a second end plate and a second scroll body that is integral with the second end plate and protrudes in a spiral shape toward the first scroll, The first scroll and the second scroll constitute a scroll compression section, a pressure adjustment chamber is provided on one side of the scroll compression section in the thrust direction, into which a fluid having a suction pressure in the suction chamber, a discharge pressure in the discharge chamber, or an intermediate pressure between the suction pressure and the discharge pressure is introduced, thereby reducing a thrust load acting on the scroll compression section in the thrust direction.

[0148] (Appendix 2) the suction chamber is a scroll accommodating chamber that accommodates the scroll compression section, the discharge pressure acts on the scroll compression section from the other side in the thrust direction, 2. The double-rotating scroll compressor according to claim 1, wherein a fluid at the discharge pressure or the intermediate pressure is introduced into the pressure adjusting chamber.

[0149] (Appendix 3) the first scroll has a first supported portion extending from the first end plate to a side opposite to the compression chamber, a cover body connected to the first end plate and facing the first end plate in the thrust direction while sandwiching the second scroll therebetween, and a second supported portion extending from the cover body to a side opposite to the compression chamber, the second scroll has a third journal portion provided on the second end plate opposite to the compression chamber, The housing includes: a first partition wall that partitions the scroll accommodating chamber while facing the first end plate in the thrust direction; and a first journal portion provided on the first partition wall; a second partition wall that partitions the scroll accommodating chamber while facing the cover body in the thrust direction, and a second journal portion that is provided on the second partition wall, Further provided is a third support portion disposed eccentrically relative to the second support portion, The first to third supported portions are supported by the first to third supporting portions via bearings, respectively; 3. The double rotary scroll compressor according to claim 2, wherein the pressure adjustment chamber is formed between the second end plate and the third bearing portion.

[0150] (Appendix 4) the first scroll has a first supported portion extending from the first end plate to a side opposite to the compression chamber, a cover body connected to the first end plate and facing the first end plate in the thrust direction while sandwiching the second scroll therebetween, and a second supported portion extending from the cover body to a side opposite to the compression chamber, the second scroll has a third journal portion provided on the second end plate opposite to the compression chamber, The housing includes: a first partition wall that partitions the scroll accommodating chamber while facing the first end plate in the thrust direction; and a first journal portion provided on the first partition wall; a second partition wall that partitions the scroll accommodating chamber while facing the cover body in the thrust direction, and a second journal portion that is provided on the second partition wall, Further provided is a third support portion disposed eccentrically relative to the second support portion, The first to third supported portions are supported by the first to third supporting portions via bearings, respectively; 4. The double rotary scroll compressor according to claim 2, wherein the pressure adjustment chamber is formed between the second end plate and the second bearing portion.

[0151] (Appendix 5) the first scroll has a first supported portion extending from the first end plate to a side opposite to the compression chamber, a cover body connected to the first end plate and facing the first end plate in the thrust direction while sandwiching the second scroll therebetween, and a second supported portion extending from the cover body to a side opposite to the compression chamber, the second scroll has a third journal portion provided on the second end plate opposite to the compression chamber, The housing includes: a first partition wall that partitions the scroll accommodating chamber while facing the first end plate in the thrust direction; and a first journal portion provided on the first partition wall; a second partition wall that partitions the scroll accommodating chamber while facing the cover body in the thrust direction, and a second journal portion that is provided on the second partition wall, Further provided is a third support portion disposed eccentrically relative to the second support portion, The first to third supported portions are supported by the first to third supporting portions via bearings, respectively; 4. The double rotary scroll compressor according to claim 2, wherein the pressure adjustment chamber is formed between the cover body and the second partition wall.

[0152] (Appendix 6) the suction chamber is a scroll accommodating chamber that accommodates the scroll compression section, the discharge chamber, into which the compressed fluid is discharged from the compression chamber, is disposed on the one side of the scroll compression section in the thrust direction, and a partition wall is disposed to close an opening on the one side of the discharge chamber; the discharge chamber is connected to the outside of the housing by a discharge passage extending in a direction intersecting the thrust direction, the pressure adjustment chamber is formed between an end surface of the partition wall opposite to the discharge chamber and a housing opposing surface opposing the end surface, 2. The double rotary scroll compressor according to claim 1, wherein a fluid at the suction pressure is introduced into the pressure adjusting chamber.

[0153] (Appendix 7) 7. The double-rotating scroll compressor according to any one of claims 1 to 6, wherein a thrust bearing is provided between the housing and the scroll compression section.

[0154] (Appendix 8) 8. The double-rotating scroll compressor according to claim 1, wherein at least one of the bearings is a sliding bearing. [Industrial Applicability]

[0155] The present invention can be used in vehicle air conditioning systems and the like. [Explanation of symbols]

[0156] 30...Drive scroll (1st scroll) 31... Driving end plate (first end plate) 33...Drive spiral (first spiral) 35...Cover body 36...Discharge valve chamber (discharge chamber) 39...First boss (first bearing part) 39A...First discharge part (discharge chamber) 40...Driven scroll (second scroll) 41…Driven end plate (second end plate) 43...Driven spiral (second spiral) 53...Second boss (second bearing part) 55...Compression chamber 60…Housing 61A...Suction chamber (scroll housing chamber) 63...First bottom wall (second partition wall) 64…Second axis branch 66…1st axis branch 67...Bearing housing (first compartment wall) 71...First sliding bearing (bearing, sliding bearing) 72... Second sliding bearing (bearing, sliding bearing) 73...Third sliding bearing (bearing, sliding bearing) 74...Concave portion (third supported portion) 76...First pressure adjustment chamber (pressure adjustment chamber) 79...Second pressure adjustment chamber (pressure adjustment chamber) 80...Scroll compression section 83...Thrust bearing 84...Partition wall 841…Front (end face) 85...5th communication passage (discharge passage) 86...Plank cover (first compartment wall) 86B…6th communication passage (discharge passage) 871...Bottom (facing the housing) 87A...Expansion recess (first bearing portion) 88...Fourth pressure adjustment chamber (pressure adjustment chamber) 90…Third axis branch 96...Third pressure adjustment chamber (pressure adjustment chamber)

Claims

1. a housing having a suction chamber into which fluid is drawn from the outside and a discharge chamber from which the fluid is discharged to the outside; a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and defining a compression chamber for compressing a fluid between the first scroll and the second scroll, the first scroll has a first end plate and a first scroll body that is integral with the first end plate and protrudes in a spiral shape toward the second scroll, the second scroll has a second end plate and a second scroll body that is integral with the second end plate and protrudes in a spiral shape toward the first scroll, The first scroll and the second scroll constitute a scroll compression section, a pressure adjustment chamber is provided on one side of the scroll compression section in the thrust direction, into which a fluid having a suction pressure in the suction chamber, a discharge pressure in the discharge chamber, or an intermediate pressure between the suction pressure and the discharge pressure is introduced, thereby reducing a thrust load acting on the scroll compression section in the thrust direction; the suction chamber is a scroll accommodating chamber that accommodates the scroll compression section, the discharge pressure acts on the scroll compression section from the other side in the thrust direction, The fluid at the discharge pressure or the intermediate pressure is introduced into the pressure adjustment chamber, the first scroll has a first supported portion extending from the first end plate to a side opposite to the compression chamber, a cover body connected to the first end plate and facing the first end plate in the thrust direction while sandwiching the second scroll therebetween, and a second supported portion extending from the cover body to a side opposite to the compression chamber, the second scroll has a third supported portion provided on the second end plate opposite to the compression chamber, The housing includes: a first partition wall that partitions the scroll accommodating chamber while facing the first end plate in the thrust direction; and a first journal portion provided on the first partition wall. a second partition wall that partitions the scroll accommodating chamber while facing the cover body in the thrust direction, and a second journal portion that is provided on the second partition wall, Further provided is a third support portion disposed eccentrically relative to the second support portion, The first to third supported portions are supported by the first to third supporting portions via bearings, respectively. a pressure adjusting chamber formed between the second end plate and the third bearing portion;

2. 2. The double-rotary scroll compressor according to claim 1, wherein the pressure adjusting chamber is formed between the second end plate and the second bearing portion.

3. 2. The double-rotary scroll compressor according to claim 1, wherein the pressure adjusting chamber is formed between the cover body and the second partition wall.

4. A housing having a suction chamber into which fluid is drawn from the outside and a discharge chamber from which the fluid is discharged to the outside; a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and defining a compression chamber for compressing a fluid between the first scroll and the second scroll, the first scroll has a first end plate and a first scroll body that is integral with the first end plate and protrudes in a spiral shape toward the second scroll, the second scroll has a second end plate and a second scroll body that is integral with the second end plate and protrudes in a spiral shape toward the first scroll, The first scroll and the second scroll constitute a scroll compression section, a pressure adjustment chamber is provided on one side of the scroll compression section in the thrust direction, into which a fluid having a suction pressure in the suction chamber, a discharge pressure in the discharge chamber, or an intermediate pressure between the suction pressure and the discharge pressure is introduced, thereby reducing a thrust load acting on the scroll compression section in the thrust direction; the suction chamber is a scroll accommodating chamber that accommodates the scroll compression section, the discharge pressure acts on the scroll compression section from the other side in the thrust direction, The fluid at the discharge pressure or the intermediate pressure is introduced into the pressure adjustment chamber, the first scroll has a first supported portion extending from the first end plate to a side opposite to the compression chamber, a cover body connected to the first end plate and facing the first end plate in the thrust direction while sandwiching the second scroll therebetween, and a second supported portion extending from the cover body to a side opposite to the compression chamber, the second scroll has a third supported portion provided on the second end plate opposite to the compression chamber, The housing includes: a first partition wall that partitions the scroll accommodating chamber while facing the first end plate in the thrust direction; and a first journal portion provided on the first partition wall. a second partition wall that partitions the scroll accommodating chamber while facing the cover body in the thrust direction, and a second journal portion that is provided on the second partition wall, Further provided is a third support portion disposed eccentrically relative to the second support portion, The first to third supported portions are supported by the first to third supporting portions via bearings, respectively. The pressure adjusting chamber is formed between the second end plate and the second bearing portion.

5. A housing having a suction chamber into which fluid is drawn from the outside and a discharge chamber from which the fluid is discharged to the outside; a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and defining a compression chamber for compressing a fluid between the first scroll and the second scroll, the first scroll has a first end plate and a first scroll body that is integral with the first end plate and protrudes in a spiral shape toward the second scroll, the second scroll has a second end plate and a second scroll body that is integral with the second end plate and protrudes in a spiral shape toward the first scroll, The first scroll and the second scroll constitute a scroll compression section, a pressure adjustment chamber is provided on one side of the scroll compression section in the thrust direction, into which a fluid having a suction pressure in the suction chamber, a discharge pressure in the discharge chamber, or an intermediate pressure between the suction pressure and the discharge pressure is introduced, thereby reducing a thrust load acting on the scroll compression section in the thrust direction; the suction chamber is a scroll accommodating chamber that accommodates the scroll compression section, the discharge pressure acts on the scroll compression section from the other side in the thrust direction, The fluid at the discharge pressure or the intermediate pressure is introduced into the pressure adjustment chamber, the first scroll has a first supported portion extending from the first end plate to a side opposite to the compression chamber, a cover body connected to the first end plate and facing the first end plate in the thrust direction while sandwiching the second scroll therebetween, and a second supported portion extending from the cover body to a side opposite to the compression chamber, the second scroll has a third supported portion provided on the second end plate opposite to the compression chamber, The housing includes: a first partition wall that partitions the scroll accommodating chamber while facing the first end plate in the thrust direction; and a first journal portion provided on the first partition wall. a second partition wall that partitions the scroll accommodating chamber while facing the cover body in the thrust direction, and a second journal portion that is provided on the second partition wall, Further provided is a third support portion disposed eccentrically relative to the second support portion, The first to third supported portions are supported by the first to third supporting portions via bearings, respectively. The pressure adjusting chamber is formed between the cover body and the second partition wall.

6. A housing having a suction chamber into which fluid is drawn from the outside and a discharge chamber from which the fluid is discharged to the outside; a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and defining a compression chamber for compressing a fluid between the first scroll and the second scroll, the first scroll has a first end plate and a first scroll body that is integral with the first end plate and protrudes in a spiral shape toward the second scroll, the second scroll has a second end plate and a second scroll body that is integral with the second end plate and protrudes in a spiral shape toward the first scroll, The first scroll and the second scroll constitute a scroll compression section, a pressure adjustment chamber is provided on one side of the scroll compression section in the thrust direction, into which a fluid having a suction pressure in the suction chamber, a discharge pressure in the discharge chamber, or an intermediate pressure between the suction pressure and the discharge pressure is introduced, thereby reducing a thrust load acting on the scroll compression section in the thrust direction; the suction chamber is a scroll accommodating chamber that accommodates the scroll compression section, the discharge chamber, into which the compressed fluid is discharged from the compression chamber, is disposed on the one side of the scroll compression section in the thrust direction, and a partition wall is disposed to close an opening on the one side of the discharge chamber; the discharge chamber is connected to the outside of the housing by a discharge passage extending in a direction intersecting the thrust direction, the pressure adjustment chamber is formed between an end surface of the partition wall opposite to the discharge chamber and a housing opposing surface opposing the end surface, a pressure adjusting chamber configured to adjust the pressure of the fluid;

7. 4. The double-rotating scroll compressor according to claim 1, wherein a thrust bearing is provided between the housing and the scroll compression section.

8. 4. A double-rotating scroll compressor according to claim 1, wherein at least one of the bearings is a sliding bearing.

Images