Double-rotating scroll compressor

Abstract

To provide a bidirectional rotation scroll-type compressor superior in quietness.SOLUTION: A bidirectional rotation scroll-type compressor includes a driving scroll 30 and a driven scroll 40 and the like. The driving scroll 30 has a driving end plate 31 and a driving spiral body 33. The driven scroll 40 has a driven end plate 41 and a driven spiral body 43. A driving-side thick portion 31A is formed on the driving end plate 31. A driven-side thick portion 41A is formed on the driven end plate 41. A driving spiral short portion 33A is formed on the driving spiral body 33. A driven spiral short portion 43A is formed on the driven spiral body 43. The driving-side thick portion 31A and the driving spiral short portion 33A are disposed on a position to make a center of gravity G10 of the driving spiral body 33 agree with or approach a driving axis R1, and the driven-side thick portion 41A and the driven spiral short portion 43A are disposed on a position to make a center of gravity G20 of the driven spiral body 43 agree with or approach a driven axis R2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

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

[0003] The drive mechanism has a rotating shaft extending within the housing. The fixed scroll is fixed within the housing. The driven scroll is provided within the housing and connected to the rotating shaft. The driven scroll is rotatable together with the rotating shaft about the drive axis. The driven mechanism couples the driven scroll to the housing while preventing the driven scroll from rotating on its own axis.

[0004] More specifically, the fixed scroll has a fixed end plate and a fixed scroll body. The fixed end plate extends perpendicular to the drive shaft. The fixed scroll body projects from the fixed end plate toward the driven scroll parallel to the drive shaft and forms a spiral shape around the drive shaft.

[0005] The driven scroll has a driven end plate extending perpendicular to the drive axis and a driven volute that projects from the driven end plate toward the fixed scroll parallel to the drive axis and forms a spiral shape around the drive axis.

[0006] In this scroll compressor, a fixed scroll and a driven scroll are arranged to face each other, forming a compression chamber. The driven scroll rotates around the drive shaft, changing the volume of the compression chamber. As a result, refrigerant gas in the suction chamber is drawn into the compression chamber and compressed. The compressed refrigerant gas is then discharged to the outside.

[0007] In this scroll compressor, the driven end plate has a plurality of recessed portions formed on the surface opposite to the surface on which the driven scroll is formed, thereby correcting the static balance of the driven scroll and bringing the center of gravity of the drive scroll and the drive shaft center as close as possible to each other, thereby suppressing noise during rotation of the driven scroll. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 5512436 Summary of the Invention [Problem to be solved by the invention]

[0009] In the conventional scroll compressor described above, the static balance of the driven scroll can be corrected by the multiple recessed portions formed in the driven scroll, but the dynamic balance of the driven scroll is significantly deteriorated. However, in a configuration like this scroll compressor, in which the fixed scroll is fixed to the housing and only the driven scroll rotates around the drive axis to compress the fluid, the deterioration of the dynamic balance of the driven scroll does not have much impact on quietness.

[0010] However, among scroll compressors, there are also double-rotary scroll compressors in which a drive scroll rotates about a drive axis and a driven scroll rotates about a driven axis to compress a fluid. In order to improve the quietness of such double-rotary scroll compressors, it is necessary not only to correct the static balance but also to suppress deterioration of the dynamic balance.

[0011] The present invention has been made in view of the above-mentioned conventional circumstances, and an object to be achieved is to provide a double-rotation scroll compressor that is excellent in quietness. [Means for solving the problem]

[0012] A first double-rotary scroll compressor of the present invention comprises a drive mechanism, a drive scroll, a driven mechanism, a driven scroll, and a housing, the drive scroll is driven to rotate about a drive axis by the drive mechanism; The driven scroll is rotated by the driving scroll and the driven mechanism around a driven axis that is eccentric with respect to the driving scroll, The drive scroll has a drive end plate extending intersecting the drive axis, and a drive scroll protruding from the drive end plate toward the driven scroll in parallel with the drive axis and having a spiral shape, The driven scroll has a driven end plate extending intersecting the driven axis, and a driven scroll body projecting from the driven end plate toward the drive scroll in parallel with the driven axis and having a spiral shape, In a double rotary scroll compressor, the driving scroll and the driven scroll form a compression chamber by opposing each other, and the volume of the compression chamber is changed by the rotation driving and the rotation driven, A driving side thick portion is formed on the surface of the driving end plate facing the driving scroll so as to bulge toward the driven end plate, so that the center of gravity of the driving scroll coincides with or approaches the drive shaft center, or a driving scroll short portion is formed on the driving scroll so as to have a length shorter than the length of the longest portion of the driving scroll extending toward the driven end plate, When the driving side thick portion is formed, a driven spiral short portion is formed with a length shorter than the length of the longest portion of the driven spiral body extending toward the driving end plate so as to avoid interference with the driving side thick portion with respect to the driven spiral body, When the drive spiral short portion is formed, a driven side thick portion is formed on the surface of the driven end plate on the driven spiral body side, bulging toward the drive spiral short portion.

[0013] In the first double-rotating scroll compressor of the present invention, the drive-side thick portion or the drive scroll short portion can make the center of gravity of the drive scroll coincide with or approach the drive shaft center.

[0014] The drive-side thick portion is formed on the surface of the drive end plate facing the drive scroll. Therefore, when canceling out the centrifugal force acting on the drive scroll as the drive scroll rotates, the drive-side thick portion can cancel out the centrifugal force at a position closer to the drive scroll, compared to when a weight is provided on the surface of the drive end plate opposite the drive scroll. This allows the drive-side thick portion to effectively cancel out the centrifugal force acting on the drive scroll.

[0015] Furthermore, the drive spiral short portion formed on the drive spiral functions as a recessed portion in the drive spiral. In other words, a recessed portion is formed in the drive spiral itself. Therefore, compared to when a recessed portion is provided on the surface of the drive end plate opposite the drive spiral, the drive spiral short portion can offset the centrifugal force at a position closer to the drive spiral. This allows the drive spiral short portion to also effectively offset the centrifugal force acting on the drive spiral.

[0016] In this way, in the first double-rotary scroll compressor, the static balance of the drive scroll can be corrected while deterioration of the dynamic balance of the drive scroll can be suppressed.

[0017] Therefore, the first double-rotating scroll compressor of the present invention is excellent in quietness.

[0018] A second double-rotating scroll compressor of the present invention includes a drive mechanism, a drive scroll, a driven mechanism, a driven scroll, and a housing, the drive scroll is driven to rotate about a drive axis by the drive mechanism; The driven scroll is rotated by the driving scroll and the driven mechanism around a driven axis that is eccentric with respect to the driving scroll, The drive scroll has a drive end plate extending intersecting the drive axis, and a drive scroll protruding from the drive end plate toward the driven scroll and having a spiral shape, The driven scroll has a driven end plate extending intersecting the driven axis, and a driven scroll body protruding from the driven end plate toward the driving scroll and forming a spiral shape, In a double rotary scroll compressor, the driving scroll and the driven scroll form a compression chamber by opposing each other, and the volume of the compression chamber is changed by the rotation driving and the rotation driven, A driven side thick portion is formed on the driven end plate's surface on the driven scroll side, bulging toward the drive end plate, so that the center of gravity of the driven scroll coincides with or approaches the driven axis, or a driven scroll short portion is formed on the driven scroll, the length of which is shorter than the length of the longest portion of the driven scroll extending toward the drive end plate, When the driven-side thick portion is formed, a drive spiral short portion is formed on the drive spiral body, the drive spiral short portion having a length shorter than the length of the longest portion of the drive spiral body extending toward the driven end plate, so as to avoid interference with the driven-side thick portion. When the driven spiral short portion is formed, the driven spiral is inserted into the driven spiral body side surface of the driving end plate. Short part The drive side thick portion is formed so as to bulge outward.

[0019] In the second double-rotating scroll compressor of the present invention, the center of gravity of the driven scroll can be made to coincide with or approach the driven axis by the driven-side thick portion or the driven scroll short portion.

[0020] Here, the driven-side thick portion is formed on the surface of the driven end plate facing the driven scroll. Furthermore, the driven scroll short portion formed on the driven scroll functions as a reduced-depth portion in the driven scroll. Therefore, the driven-side thick portion and the driven scroll short portion can effectively offset the centrifugal force acting on the driven scroll when the driven scroll rotates. Therefore, in the second double-rotating scroll compressor, the static balance of the driven scroll can be corrected while preventing deterioration of the dynamic balance of the driven scroll.

[0021] Therefore, the second double-rotating scroll compressor of the present invention is excellent in quietness.

[0022] A third double-rotating scroll compressor of the present invention includes a drive mechanism, a drive scroll, a driven mechanism, a driven scroll, and a housing, the drive scroll is driven to rotate about a drive axis by the drive mechanism; The driven scroll is rotated by the driving scroll and the driven mechanism around a driven axis that is eccentric with respect to the driving scroll, The drive scroll has a drive end plate extending intersecting the drive axis, and a drive scroll protruding from the drive end plate toward the driven scroll and having a spiral shape, The driven scroll has a driven end plate extending intersecting the driven axis, and a driven scroll body protruding from the driven end plate toward the driving scroll and forming a spiral shape, In a double rotary scroll compressor, the driving scroll and the driven scroll form a compression chamber by opposing each other, and the volume of the compression chamber is changed by the rotation driving and the rotation driven, The drive end plate is formed with a drive-side thick portion that bulges toward the driven scroll, The driven end plate is formed with a driven-side thick portion that bulges toward the drive scroll, The driving scroll has a length shorter than the length of the longest part of the driving scroll extending toward the driven end plate so as to avoid interference with the driven-side thick part. Short part is formed, The driven scroll is formed with a short driven scroll portion that is shorter than the longest portion of the driven scroll extending toward the drive end plate so as to avoid interference with the drive-side thick portion, the drive-side thick portion and the drive spiral short portion are disposed at positions such that the center of gravity of the drive spiral coincides with or approaches the drive shaft center, The driven thick portion and the driven spiral short portion are disposed at positions where the center of gravity of the driven spiral body coincides with or approaches the driven axis.

[0023] In the third double-rotating scroll compressor of the present invention, the drive-side thick portion and the drive-driven scroll short portion allow the center of gravity of the drive scroll to coincide with or be close to the drive shaft center, and the driven-side thick portion and the driven scroll short portion allow the center of gravity of the driven scroll to coincide with or be close to the driven shaft center.

[0024] The centrifugal force acting on the drive spiral can be effectively offset by the drive-side thick portion and the drive spiral short portion, and the centrifugal force acting on the driven spiral can be effectively offset by the driven-side thick portion and the driven spiral short portion, thereby correcting the static balance of the drive spiral and the driven spiral while preventing deterioration of the dynamic balance of the drive spiral and the driven spiral.

[0025] Therefore, the third double-rotating scroll compressor of the present invention is excellent in quietness.

[0026] In the first to third double-rotary scroll compressors of the present invention, it is preferable that a weight or a recessed portion be provided on the surface of the drive end plate opposite to the side where the drive scroll is formed, so that the center of gravity of the drive scroll coincides with or approaches the drive shaft center. In this case, the weight or the recessed portion can also adjust the static balance of the drive scroll.

[0027] In the first to third double-rotating scroll compressors of the present invention, it is preferable that a weight or a recessed portion be provided on the surface of the driven end plate opposite to the surface on which the driven scroll is formed, so that the center of gravity of the driven scroll coincides with or approaches the driven axis. In this case, the weight or the recessed portion can also adjust the static balance of the driven scroll. [Effects of the Invention]

[0028] The first to third double rotation scroll compressors of the present invention are excellent in quietness. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a cross-sectional view of a double-rotating scroll compressor according to an embodiment of the present invention. [Figure 2]FIG. 2 is a front view of the driving scroll of the double rotary scroll compressor of the embodiment, as viewed from the front. [Figure 3] FIG. 3 is a front view of the driven scroll of the double-rotating scroll compressor of the embodiment, as viewed from the front. [Figure 4] FIG. 4 is a front view of the driving scroll and the driven scroll of the double rotary scroll compressor of the embodiment, as viewed from the front. DETAILED DESCRIPTION OF THE INVENTION

[0030] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

[0031] As shown in Fig. 1, the double-rotating scroll compressor (hereinafter simply referred to as the compressor) of this embodiment includes a housing 60, an electric motor 10, a driving scroll 30, a driven scroll 40, and a driven mechanism 20. The electric motor 10 is an example of the "drive mechanism" in the present invention. This compressor is mounted in a vehicle (not shown) and forms part of a vehicle air conditioning system.

[0032] 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.

[0033] The housing 60 is composed of a housing main body 61 and a cover 65. The housing main body 61 is a bottomed, cylindrical member having an outer peripheral wall 62 and a bottom wall 63. The 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 outer peripheral wall 62 also has an inner peripheral surface 62B. The bottom wall 63 is located at the rear end of the housing main body 61. The bottom wall 63 extends in a substantially circular, flat plate shape, perpendicular to the drive axis R1.

[0034] The outer peripheral edge of the bottom wall 63 is connected to the rear end of the outer peripheral wall 62. A cylindrical bearing portion 64 is provided in a protruding manner at the center of the inner surface of the bottom wall 63, the bearing portion 64 being centered on the drive axis R1. The outer ring of a bearing 71 is fitted into the bearing portion 64.

[0035] The cover 65 is disposed in front of the housing body 61. The cover 65 extends in a generally circular, flat plate shape perpendicular to the drive axis R1. The cover 65 is fastened to the outer peripheral wall 62 of the housing body 61 with bolts (not shown) such that its outer peripheral edge abuts against the front end of the outer peripheral wall 62 of the housing body 61. In this way, the cover 65 closes the housing body 61 from the front. In this way, a suction chamber 61A is formed within the housing body 61.

[0036] A cylindrical support portion 66 is provided in a protruding position on the center of the inner surface of the cover 65, with the driven axis R2 as its center. 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 outer ring of a needle bearing 72 is fitted into the support portion 66.

[0037] The cover 65 is formed with a suction communication port 67 and a discharge communication port 68. The suction communication port 67 is located between the outer peripheral edge of the cover 65 and the support portion 66, and penetrates the cover 65 in a direction parallel to the drive shaft center R1. The suction communication port 67 communicates between the suction chamber 61A and the outside of the compressor. A pipe is connected to the suction communication port 67. 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.

[0038] The discharge communication port 68 is located at the center of the cover 65 and penetrates the cover 65 in a direction parallel to the drive shaft center R1. The discharge communication port 68 communicates with the discharge chamber 55, which will be described later. A pipe is connected to the discharge communication port 68, and refrigerant gas discharged into the discharge chamber 55 flows toward the condenser. The pipes, evaporator, and condenser are not shown in the figure.

[0039] 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.

[0040] The stator 17 is cylindrical and has a center on the drive axis R1, and has windings 18. The stator 17 is fixed to the housing body 61 and, by extension, the housing 60 by fitting into the inner peripheral surface 62B of the outer peripheral wall 62 of the housing body 61.

[0041] 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.

[0042] The drive scroll 30 is composed solely of a drive scroll body 30A made of an aluminum alloy. The drive scroll body 30A is formed by casting. The drive scroll body 30A, i.e., the drive scroll 30, has a drive end plate 31, a drive peripheral wall 32, and a drive spiral 33.

[0043] The drive end plate 31 extends in a generally circular plate shape 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. A first boss 34 is formed in the center of the rear surface 312, protruding toward the bottom wall 63. The first boss 34 is cylindrical and centered on the drive axis R1.

[0044] The drive peripheral wall 32 is formed integrally with the drive end plate 31 and extends parallel to the drive axis R1 from the outer periphery of the drive end plate 31 forward, i.e., toward the driven scroll 40. As shown in Fig. 2, the drive peripheral wall 32 has a substantially cylindrical shape centered on the drive axis R1. Four fixing holes 32A are formed in the front end of the drive peripheral wall 32.

[0045] The drive spiral 33 is located inside the drive peripheral wall 32. As shown in Fig. 1, the drive spiral 33 extends forward from the front surface 311 of the drive end plate 31 in parallel with the drive axis R1. As shown in Fig. 2, the drive spiral 33 is spirally shaped around the drive axis R1. More specifically, the drive spiral 33 is formed in a clockwise spiral around the drive axis R1 from the center of the spiral.

[0046] In this way, since the drive spiral 33 extends from the front surface 311, the front surface 311 corresponds to the "surface of the drive end plate facing the drive spiral" in the present invention. On the other hand, the rear surface 312 corresponds to the "surface of the drive end plate opposite to the side on which the drive spiral is formed" in the present invention.

[0047] 1, driven scroll 40 is composed of driven scroll body 40A made of aluminum alloy, discharge reed valve 57 made of steel, retainer 58 made of steel, and fixed pin 59 made of steel. Discharge reed valve 57, retainer 58, and fixed pin 59 are examples of the "weight body" in the present invention.

[0048] Like the drive scroll body 30A, the driven scroll body 40A is also formed by casting. The driven scroll body 40A has a driven end plate 41 and a driven spiral body 43. The driven end plate 41 extends in a generally circular plate shape perpendicular to the driven axis R2. The driven end plate 41 has a front surface 411 and a rear surface 412 located opposite the front surface 411. A second boss 44 is formed in the center of the front surface 411, protruding toward the cover 65. The second boss 44 has a cylindrical shape centered on the driven axis R2.

[0049] The driven end plate 41 is formed with an intake port 47 and an exhaust port 48. The intake port 47 is located on the driven end plate 41 at a position on the outer circumferential side of the second boss 44, and passes through the driven end plate 41 in the front-to-rear direction. The exhaust port 48 is located on the driven end plate 41 at a position within the second boss 44, and passes through the driven end plate 41 in the front-to-rear direction.

[0050] Within second boss 44, discharge reed valve 57 and retainer 58 are fixed to front surface 411 of driven end plate 41 by fixing pin 59. This enables discharge reed valve 57 to open and close discharge port 48, and retainer 58 to adjust the opening degree of discharge reed valve 57. Because discharge reed valve 57, retainer 58, and fixing pin 59 are made of steel, they have a greater specific gravity than the aluminum alloy that forms driven scroll body 40A.

[0051] The driven scroll 43 extends rearward from the rear surface 412 of the driven end plate 41, i.e., toward the driving scroll 30, parallel to the driven axis R2. As shown in Fig. 3, the driven scroll 43 is spirally wound around the driven axis R2. More specifically, the driven scroll 43 is formed in a clockwise spiral around the driven axis R2 from the center of the spiral.

[0052] In this way, since the driven spiral 43 extends from the rear surface 412, the rear surface 412 corresponds to the "surface of the driven end plate facing the driven spiral" in the present invention. On the other hand, the front surface 411 corresponds to the "surface of the driven end plate opposite to the side where the driven spiral is formed" in the present invention. shape 3 and FIG. 4, which will be described later, the suction port 47 is not shown.

[0053] As shown in Fig. 1, 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, Fig. 1 shows two of each of the rotation-preventing pins 21 and rings 22.

[0054] Each rotation-preventing pin 21 is fixed by being inserted through a corresponding fixing hole 32A in the drive peripheral wall 32. As a result, each rotation-preventing pin 21 is fixed to the drive peripheral wall 32 in a state where it protrudes forward from the drive peripheral wall 32.

[0055] Each ring 22 is provided on the driven end plate 41 side so as to face each rotation-preventing pin 21. Each ring 22 is fitted into a circular, bottomed hole recessed in the rear surface 412 of the driven end plate 41.

[0056] In this compressor, both the driving scroll 30 and the driven scroll 40 are disposed in the suction chamber 61A. The driving scroll 30 is integrated with the rotor 11 by fixing the driving peripheral wall 32 to the inner peripheral surface of the rotor 11. In the driving scroll 30, the inner ring of a bearing 71 is fitted onto the first boss 34. As a result, the driving scroll 30 is supported by the housing main body 61 so as to be rotatable about the drive axis R1. Here, in this compressor, the driving scroll 30 is supported by the housing main body 61, and ultimately the housing 60, in a so-called cantilevered state.

[0057] On the other hand, the driven scroll 40 is disposed in front of the driving scroll 30 with the driven scroll 43 facing the driving scroll 30. As a result, the front surface 311 of the driving end plate 31 and the rear surface 412 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 are arranged such that the driving scroll 33 and the driven scroll 43 mesh with each other inside the driving peripheral wall 32, and the rotation-preventing pins 21 are inserted into the rings 22. In this manner, the driving scroll 30 and the driven scroll 40 are assembled in the front-to-rear direction. The driving scroll 33 and the driven scroll 43 form a compression chamber 50 therebetween.

[0058] In the driven scroll 40, the inner ring of the needle bearing 72 is fitted onto the second boss 44. As a result, the driven scroll 40 is supported by the cover 65 so as to be rotatable about the driven axis R2. Here, in this compressor, the driven scroll 40 is also supported by the cover 65, and ultimately by the housing 60, in a so-called cantilevered state.

[0059] Furthermore, because the driven scroll 40 is supported by the cover 65, the space surrounded by the inner circumferential surface of the second boss 44 and sandwiched between the cover 65 and the driven end plate 41 forms a discharge chamber 55. In other words, the discharge reed valve 57, the retainer 58, and the fixed pin 59 are disposed within the discharge chamber 55. As a result, the discharge reed valve 57, the retainer 58, and the fixed pin 59 are positioned near the driven axis R2.

[0060] In this compressor, a drive-side thick portion 31A is formed on the drive end plate 31 of the drive scroll 30, and a drive spiral short portion 33A is formed on the drive scroll 33. In addition, a driven-side thick portion 41A is formed on the driven end plate 41 of the driven scroll 40, and a driven spiral short portion 43A is formed on the driven scroll 43.

[0061] As shown in Fig. 2, the driving-side thick portion 31A is formed on the front surface 311 of the driving end plate 31. The driving-side thick portion 31A extends clockwise from the center of the front surface 311, i.e., near the drive axis R1 and near the center of the spiral of the driving spiral 33, toward the outer periphery of the front surface 311 along the driving spiral 33. As shown in Fig. 1, the driving-side thick portion 31A bulges out toward the driven spiral 43 from the portion of the driving end plate 31 excluding the driving-side thick portion 31A (hereinafter referred to as the driving end plate main body 31B). In other words, the driving-side thick portion 31A is formed thicker than the driving end plate main body 31B.

[0062] 2, a first step 31C is formed at the boundary between the driving-side thick portion 31A and the driving end plate main body 31B. The length by which the driving-side thick portion 31A extends toward the outer periphery of the front surface 311, i.e., the position where the first step 31C is formed, can be designed as appropriate.

[0063] On the other hand, as shown in Fig. 1, the driven-side thick portion 41A is formed on the rear surface 412 of the driven end plate 41. As shown in Fig. 3, the driven-side thick portion 41A extends clockwise along the driven spiral 43 from the center of the rear surface 412, i.e., near the driven axis R2 and near the center of the spiral of the driven spiral 43, toward the outer periphery of the rear surface 412. As shown in Fig. 1, the driven-side thick portion 41A bulges out toward the drive spiral 33 more than the portion of the driven end plate 41 excluding the driven-side thick portion 41A (hereinafter referred to as the driven end plate main body 41B). In other words, the driven-side thick portion 41A is formed thicker than the driven end plate main body 41B.

[0064] 3, a second step 41C is formed at the boundary between the driven-side thick portion 41A and the driven end plate main body 41B. The length by which the driven-side thick portion 41A extends toward the outer periphery of the rear surface 412, i.e., the position where the second step 41C is formed, can be designed as appropriate.

[0065] Discharge port 48 opens into driven-side thick portion 41A. Furthermore, as shown in Fig. 1, driven-side thick portion 41A overlaps discharge reed valve 57, retainer 58, and fixing pin 59 in the front-rear direction, i.e., in the direction of driven axis R2.

[0066] As shown in Fig. 2, the drive scroll short portion 33A extends from the center of the drive scroll 33 toward the outer periphery of the scroll. As shown in Figs. 1 and 4, the drive scroll short portion 33A faces the driven-side thick portion 41A when the drive scroll 30 and the driven scroll 40 are assembled in the front-to-rear direction. Here, as shown in Fig. 1, the length of the drive scroll short portion 33A extending toward the driven end plate 41, i.e., the length in the direction of the drive axis R1, is shorter than the length of the portion of the drive scroll 33 excluding the drive scroll short portion 33A (hereinafter referred to as the drive scroll main body portion 33B) in the direction of the drive axis R1.

[0067] In other words, the drive spiral main body 33B is the portion of the drive spiral 33 that extends the longest toward the driven end plate 41. Therefore, the drive spiral short portion 33A is recessed further toward the drive axis R1 than the portion of the drive spiral 33 that extends the longest toward the driven end plate 41. This prevents the drive spiral short portion 33A from interfering with the driven-side thick portion 41A.

[0068] As shown in FIG. 2, a third step portion 33C is formed at the boundary between the drive spiral short portion 33A and the drive spiral main portion 33B.

[0069] As shown in Fig. 3, the driven scroll short portion 43A extends from the center of the driven scroll 43 toward the outer periphery of the scroll. As shown in Figs. 1 and 4, the driven scroll short portion 43A faces the drive-side thick portion 31A when the drive scroll 30 and the driven scroll 40 are assembled in the front-to-rear direction. Here, as shown in Fig. 1, the length of the driven scroll short portion 43A extending toward the drive end plate 31, i.e., the length in the direction of the driven axis R2, is shorter than the length of the portion of the driven scroll 43 excluding the driven scroll short portion 43A (hereinafter referred to as the driven scroll main body portion 43B) in the direction of the driven axis R2.

[0070] In other words, the driven spiral main body portion 43B is the portion of the driven spiral body 43 that extends the longest toward the drive end plate 31. Therefore, the driven spiral short portion 43A is recessed in the direction of the driven axis R2 more than the portion of the driven spiral body 43 that extends the longest toward the drive end plate 31. This prevents the driven spiral short portion 43A from interfering with the drive-side thick portion 31A.

[0071] As shown in FIG. 3, a fourth step portion 43C is formed at the boundary between the driven spiral short portion 43A and the driving spiral main portion 43B.

[0072] In this way, since the drive end plate 31 is formed with the drive-side thick portion 31A and the drive scroll 33 is formed with the drive scroll short portion 33A, in the drive scroll 30, the center of gravity G11 of the drive-side thick portion 31A and the center of gravity G12 of the drive scroll short portion 33A are located approximately at the positions indicated by the black circles in Fig. 2. When the drive end plate 31 does not have the drive-side thick portion 31A and the drive scroll 33 does not have the drive scroll short portion 33A, the center of gravity of the drive scroll 33 (hereinafter referred to as the virtual center of gravity G13) is located approximately at the position indicated by the black circle in Fig. 2.

[0073] Further, a recess 312a is provided on the rear surface 312 of the driving end plate 31. The recess 312a is an example of a "thickness recess" according to the present invention. The recess 312a is recessed in a substantially cylindrical shape from the rear surface 312 toward the front so as to overlap with the virtual center of gravity G13 indicated by a black circle. Note that the recess 312a is not shown in FIGS. 1 and 4. The shape and number of the recess 312a can be designed as appropriate.

[0074] Furthermore, because the driven end plate 41 is formed with the driven thick portion 41A and the driven spiral body 43 is formed with the driven spiral short portion 43A, in the driven scroll 40, the center of gravity G21 of the driven thick portion 41A and the center of gravity G22 of the driven spiral short portion 43A are located approximately at the positions indicated by the black circles in Fig. 3. When the driven end plate 41 does not have the driven thick portion 41A and the driven spiral body 43 does not have the driven spiral short portion 43A, the center of gravity of the driven spiral body 43 (hereinafter referred to as the virtual center of gravity G23) is located approximately at the position indicated by the black circle in Fig. 3.

[0075] In the compressor configured as described above, when the electric motor 10 is operated and the rotor 11 rotates, the drive scroll 30 is driven to rotate about the drive axis R1 within the suction chamber 61A. That is, the drive scroll 30 and the rotor 11 are driven to rotate together. At this time, in the driven mechanism 20, each rotation-preventing pin 21 slides against the inner circumferential surface of each ring 22, causing each ring 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 drive scroll 30 to the driven scroll 40.

[0076] As a result, the driven scroll 40 is rotated around the driven axis R2 by the drive 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 drive 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 drive scroll 30, thereby changing the volume of the compression chamber 50.

[0077] As a result, refrigerant gas in the suction chamber 61A is drawn into the compression chamber 50 through the suction port 47 and compressed in the compression chamber 50. The refrigerant gas compressed to discharge pressure in the compression chamber 50 is then discharged from the discharge port 48 to the discharge chamber 55 and further discharged from the discharge communication port 68 to the condenser. In this manner, air conditioning is performed by the vehicle air conditioner.

[0078] In this compressor, a drive-side thick portion 31A is formed on the drive end plate 31 of the drive scroll 30, and a drive spiral short portion 33A is formed on the drive scroll 33. Also, a driven-side thick portion 41A is formed on the driven end plate 41 of the driven scroll 40, and a driven spiral short portion 43A is formed on the driven scroll 43.

[0079] The center of gravity G11 of the drive-side thick portion 31A, the center of gravity G12 of the drive scroll short portion 33A, and the virtual center of gravity G13 of the drive scroll 33 are located at the positions shown in Fig. 2. As a result, in the drive scroll 30, the center of gravity G10 of the drive scroll 33 is located at a position approximately midway between the center of gravity G11, the center of gravity G12, and the virtual center of gravity G13, as shown by the two-dot chain line in Fig. 2. In this way, in this compressor, the center of gravity G10 of the drive scroll 33 can be made to approximately coincide with the drive axis R1.

[0080] The center of gravity G21 of the driven-side thick portion 41A, the center of gravity G22 of the driven scroll short portion 43A, and the virtual center of gravity G23 of the driven scroll 43 are located at the positions shown in Fig. 3. As a result, in the driven scroll 40, the center of gravity G20 of the driven scroll 43 is located approximately midway between the center of gravity G21, the center of gravity G22, and the virtual center of gravity G23, as shown by the dashed line in Fig. 3. In this way, in this compressor, the center of gravity G20 of the driven scroll 43 can be made to approximately coincide with the driven axis R2.

[0081] Here, "approximately aligning the center of gravity G10 of the drive scroll 33 with the drive axis R1" refers to a case where the center of gravity G10 of the drive scroll 33 and the drive axis R1 are completely aligned, as well as a case where the center of gravity G10 of the drive scroll 33 is close to the drive axis R1 but does not completely align. Furthermore, "approximately aligning the center of gravity G20 of the driven scroll 43 with the driven axis R2" refers to a case where the center of gravity G20 of the driven scroll 43 is close to the driven axis R2 but does not completely align.

[0082] The drive-side thick portion 31A is formed on the front surface 311 of the drive end plate 31 and is located close to the drive scroll 33. The drive scroll short portion 33A formed on the drive scroll 33 functions as a recessed portion of the drive scroll 33. As described above, the center of gravity G11 of the drive-side thick portion 31A and the center of gravity G12 of the drive scroll short portion 33A are located at the positions shown in FIG. 2 . Therefore, the drive-side thick portion 31A and the drive scroll short portion 33A can offset, at positions close to the drive scroll 33, the centrifugal force acting on the drive scroll 33 when the drive scroll 30 is driven to rotate. This allows the drive-side thick portion 31A and the drive scroll short portion 33A to effectively offset the centrifugal force acting on the drive scroll 33.

[0083] The driven-side thick portion 41A is formed on the rear surface 412 of the driven end plate 41 and is located close to the driven scroll 43. The driven scroll short portion 43A formed on the driven scroll 43 functions as a recessed portion in the driven scroll 43. As described above, the center of gravity G21 of the driven-side thick portion 41A and the center of gravity G22 of the driven scroll short portion 43A are located at the positions shown in FIG. 3 . Therefore, the driven-side thick portion 41A and the driven scroll short portion 43A can offset, at a position close to the driven scroll 43, the centrifugal force acting on the driven scroll 43 when the driven scroll 40 is rotated. This allows the driven-side thick portion 41A and the driven scroll short portion 43A to effectively offset the centrifugal force acting on the driven scroll 43.

[0084] In this way, in this compressor, the static balance between the drive volute 33 and the driven volute 43 can be corrected while deterioration of the dynamic balance between the drive volute 33 and the driven volute 43 can be suppressed.

[0085] Therefore, the compressor of the embodiment is excellent in quietness.

[0086] Furthermore, in this compressor, by casting the drive scroll body 30A, it is possible to simultaneously form the drive end plate 31, the drive peripheral wall 32, the drive scroll 33, the drive-side thick portion 31A, and the drive scroll short portion 33A. Similarly, by casting the driven scroll body 40A, it is possible to simultaneously form the driven end plate 41, the driven scroll 43, the driven-side thick portion 41A, and the driven scroll short portion 43A. This also enables the compressor to be manufactured at low cost.

[0087] Furthermore, in this compressor, a recess 312a is formed in the rear surface 312 of the drive end plate 31, and this recess 312a also makes it possible to adjust the static balance of the drive scroll 33.

[0088] On the other hand, a discharge reed valve 57 and a retainer 58 are fixed to the driven end plate 41 by a fixing pin 59. Furthermore, the discharge reed valve 57, the retainer 58, and the fixing pin 59 are arranged so as to overlap with the driven-side thick portion 41A in the direction of the driven axis R2, and are therefore located near the center of the driven scroll 43, and therefore near the driven axis R2. The discharge reed valve 57, the retainer 58, and the fixing pin 59 are made of steel, and have a specific gravity greater than that of the aluminum alloy that forms the driven scroll body 40A, including the driven end plate 41. This makes it possible to adjust the static balance of the driven scroll 43 by utilizing the weights of the discharge reed valve 57, the retainer 58, and the fixing pin 59.

[0089] Although the present invention has been described above with reference to the examples, it goes without saying that the present invention is not limited to the above examples and can be modified and applied as appropriate within the scope of the invention.

[0090] For example, the compressor may be configured such that the formation of the driven side thick portion 41A on the driven end plate 41 is omitted, and the formation of the drive scroll short portion 33A on the drive scroll 33 is omitted.

[0091] Furthermore, the compressor may be configured such that the formation of the driving side thick portion 31A on the driving end plate 31 is omitted, and the formation of the driven scroll short portion 43A on the driven scroll 43 is omitted.

[0092] In the compressor of the embodiment, a recess 312a is formed on the rear surface 312 of the drive end plate 31. However, this is not limiting, and a protruding portion that protrudes rearward may be integrally formed on the rear surface 312, and this protruding portion may be used as the "weight body" in the present invention, or a member that serves as the "weight body" may be fixed to the rear surface 312.

[0093] Furthermore, the formation of the recess 312a on the rear surface 312 may be omitted.

[0094] Further, a recess similar to the recess 312 may be formed on the front surface 411 of the driven end plate 41 .

[0095] In the compressor of the embodiment, the discharge reed valve 57, the retainer 58, and the fixing pin 59 are defined as "weight bodies" in the present invention. However, this is not limiting, and the "weight bodies" may also be bolts or the like provided on the rear surface 312 of the driving end plate 31 or the front surface 411 of the driven end plate 41.

[0096] Alternatively, the discharge port 48 may be formed in the driving end plate 31 instead of the driven end plate 41 , and the discharge reed valve 57 and the retainer 58 may be fixed to the driving end plate 31 by a fixing pin 59 .

[0097] In the compressor of the embodiment, a first step 31C is formed at the boundary between the driving-side thick portion 31A and the driving end plate main body 31B in the driving end plate 31. However, this is not limiting, and a configuration in which the driving-side thick portion 31A and the driving end plate main body 31B are smoothly connected may also be used. The same applies to the following: between the driven-side thick portion 41A and the driven end plate main body 41B; between the driving spiral short portion 33A and the driving spiral main body 33B; and between the driven spiral short portion 43A and the driven spiral main body 43B.

[0098] In the compressor of the embodiment, the driven mechanism 20 is composed of the rotation-preventing pin 21 and the 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.

[0099] Furthermore, in the compressor of the embodiment, the driving scroll 33 and the driven scroll 43 are formed in a right-handed winding, but this is not limiting, and the driving scroll 33 and the driven scroll 43 may also be formed in a left-handed winding.

[0100] In the compressor of the embodiment, the driving scroll 30 and the rotor 11 are integrated by fixing the driving peripheral wall 32 to the inner peripheral surface of the rotor 11. However, the present invention is not limited to this, 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, so that the driving scroll 30 and the rotor 11 are spaced apart in the direction of the drive axis R1. [Industrial Applicability]

[0101] The present invention can be used in vehicle air conditioning systems and the like. [Explanation of symbols]

[0102] 10...Electric motor (drive mechanism) 20…Following mechanism 30...Drive scroll 31...Drive end plate 31A...Drive side thick section 33...Driven spiral 33A...Drive spiral short section 40...Driven scroll 41…Driven end plate 41A…Driver side thick part 43...Driven spiral 43A...Follower spiral short section 57...Discharge reed valve (heavy body) 58...Retainer (heavy body) 59...Fixing pin (heavy weight) 60…Housing 311...Front surface (surface of the drive end plate facing the drive scroll) 312... Rear surface (surface opposite to the side where the driving spiral of the driving end plate is formed) 312a...Concave part (thin part) 411...Front surface (the surface opposite to the side where the driven spiral body of the driven end plate is formed) 412...Rear surface (surface of the driven end plate facing the driven scroll) G10: Center of gravity of driving spiral G20: Center of gravity of driven spiral body R1: Drive shaft center R2…driven shaft center

Claims

1. a drive mechanism, a drive scroll, a driven mechanism, a driven scroll, and a housing; the drive scroll is driven to rotate about a drive axis by the drive mechanism; The driven scroll is rotated by the driving scroll and the driven mechanism around a driven axis that is eccentric with respect to the driving scroll, The drive scroll has a drive end plate extending intersecting the drive axis, and a drive scroll protruding from the drive end plate toward the driven scroll in parallel with the drive axis and having a spiral shape, The driven scroll has a driven end plate extending intersecting the driven axis, and a driven scroll body projecting from the driven end plate toward the drive scroll in parallel with the driven axis and having a spiral shape, In a double rotary scroll compressor, the driving scroll and the driven scroll form a compression chamber by opposing each other, and the volume of the compression chamber is changed by the rotation driving and the rotation driven, A driving side thick portion is formed on the surface of the driving end plate facing the driving scroll so as to bulge toward the driven end plate, so that the center of gravity of the driving scroll coincides with or approaches the drive shaft center, or a driving scroll short portion is formed on the driving scroll so as to have a length shorter than the length of the longest portion of the driving scroll extending toward the driven end plate, When the driving side thick portion is formed, a driven spiral short portion is formed with a length shorter than the length of the longest portion of the driven spiral body extending toward the driving end plate so as to avoid interference with the driving side thick portion with respect to the driven spiral body, When the drive scroll short portion is formed, a driven-side thick portion is formed on the surface of the driven end plate facing the driven scroll body, the thick portion bulging toward the drive scroll short portion.

2. a drive mechanism, a drive scroll, a driven mechanism, a driven scroll, and a housing; the drive scroll is driven to rotate about a drive axis by the drive mechanism; The driven scroll is rotated by the driving scroll and the driven mechanism around a driven axis that is eccentric with respect to the driving scroll, The drive scroll has a drive end plate extending intersecting the drive axis, and a drive scroll protruding from the drive end plate toward the driven scroll and having a spiral shape, The driven scroll has a driven end plate extending intersecting the driven axis, and a driven scroll body protruding from the driven end plate toward the driving scroll and forming a spiral shape, In a double rotary scroll compressor, the driving scroll and the driven scroll form a compression chamber by opposing each other, and the volume of the compression chamber is changed by the rotation driving and the rotation driven, A driven side thick portion is formed on the driven end plate's surface on the driven scroll side, bulging toward the drive end plate, so that the center of gravity of the driven scroll coincides with or approaches the driven axis, or a driven scroll short portion is formed on the driven scroll, the length of which is shorter than the length of the longest portion of the driven scroll extending toward the drive end plate, When the driven-side thick portion is formed, a drive spiral short portion is formed on the drive spiral body, the drive spiral short portion having a length shorter than the length of the longest portion of the drive spiral body extending toward the driven end plate, so as to avoid interference with the driven-side thick portion. When the driven scroll short portion is formed, a drive-side thick portion is formed on the surface of the drive end plate facing the driven scroll body, the thick portion bulging toward the driven scroll short portion.

3. a drive mechanism, a drive scroll, a driven mechanism, a driven scroll, and a housing; the drive scroll is driven to rotate about a drive axis by the drive mechanism; The driven scroll is rotated by the driving scroll and the driven mechanism around a driven axis that is eccentric with respect to the driving scroll, The drive scroll has a drive end plate extending intersecting the drive axis, and a drive scroll protruding from the drive end plate toward the driven scroll and having a spiral shape, The driven scroll has a driven end plate extending intersecting the driven axis, and a driven scroll body protruding from the driven end plate toward the driving scroll and forming a spiral shape, In a double rotary scroll compressor, the driving scroll and the driven scroll form a compression chamber by opposing each other, and the volume of the compression chamber is changed by the rotation driving and the rotation driven, The drive end plate is formed with a drive-side thick portion that bulges toward the driven scroll, The driven end plate is formed with a driven-side thick portion that bulges toward the drive scroll, The drive scroll is formed with a drive scroll short portion having a length shorter than the longest portion of the drive scroll extending toward the driven end plate so as to avoid interference with the driven-side thick portion, The driven scroll is formed with a short driven scroll portion that is shorter than the longest portion of the driven scroll extending toward the drive end plate so as to avoid interference with the drive-side thick portion, the drive-side thick portion and the drive spiral short portion are disposed at positions such that the center of gravity of the drive spiral coincides with or approaches the drive shaft center, a driven-side thick portion and a driven scroll short portion disposed at positions such that a center of gravity of the driven scroll coincides with or approaches a driven axis;

4. 4. The double-rotary scroll compressor according to claim 1, wherein a weight or a recessed portion is provided on a surface of the drive end plate opposite to a side on which the drive scroll is formed, so that the center of gravity of the drive scroll coincides with or approaches the drive shaft center.

5. 5. The double-rotating scroll compressor according to claim 1, wherein a weight or a recessed portion is provided on a surface of the driven end plate opposite to a surface on which the driven scroll is formed, so that the center of gravity of the driven scroll coincides with or approaches the driven axis.

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