Dual rotation scroll compressor

Abstract

A bearing cover body (40B) having a cover portion (47) and a boss portion (48) is coupled to a front surface (411) of the driven end plate (41). A recess (50) that forms a discharge valve chamber (44) is recessed in the front surface (411), and a discharge valve (57) is housed in the discharge valve chamber (44). A part of the discharge valve chamber (44) and a part of the discharge valve (57) are covered by a cover section (47). The internal space (48A) of the boss (48) communicates with the discharge section (65C) and the discharge valve chamber (44). A bearing (72) that rotatably supports the driven scroll (40) with respect to the housing (60) is provided on the outer peripheral surface of the boss (48).

Description

Technical Field

[0001] The present invention relates to a twin-rotary scroll compressor. Background Art

[0002] A conventional twin-rotating scroll compressor is disclosed in Patent Document 1. The twin-rotating scroll compressor includes a driving mechanism, a driving scroll, a driven mechanism, a driven scroll, and a casing.

[0003] The housing has a suction chamber for sucking fluid from the outside and a discharge chamber for discharging the fluid to the outside.

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

[0005] The driving scroll has a driving end plate and a driving scroll body. The driving end plate extends to intersect the driving axis. The driving scroll body protrudes from the driving end plate toward the driven scroll and has a spiral shape.

[0006] The driven scroll has a driven end plate and a driven scroll body. The driven end plate extends to intersect with the driven axis. The driven scroll body protrudes from the driven end plate toward the driving scroll and has a spiral shape.

[0007] The driving scroll and the driven scroll are opposed to each other to form a compression chamber, and the volume of the compression chamber changes by rotational driving and rotational following, and the fluid sucked from the suction chamber is compressed according to the volume change and discharged to the discharge chamber.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application Publication No. 2002-310073 Summary of the invention

[0011] Problems to be solved by the invention

[0012] In a twin-rotating scroll compressor, a pair of bearings are arranged to sandwich a driving scroll and a driven scroll. The driving scroll is rotatably supported by a driving-side bearing and the driven scroll is rotatably supported by a driven-side bearing relative to a casing.

[0013] However, in the above-mentioned conventional twin-rotating scroll compressor, a cylindrical protrusion is integrally provided on the outer end surface of the driven end plate on the side opposite to the compression chamber, and a driven side bearing is mounted on the outer peripheral surface of the protrusion. In addition, a discharge port for discharging fluid from the compression chamber is provided on the driven end plate, and a discharge valve for opening and closing the discharge port is arranged in the protrusion.

[0014] With this structure, in the above-mentioned conventional twin-rotating scroll compressor, the discharge valve is arranged in the protrusion, and as a result, the inner diameter of the protrusion is longer than the length of the longest part of the discharge valve, so it is inevitable to enlarge the protrusion and the bearing mounted on the protrusion. When the bearing is enlarged, the sliding distance per rotation becomes larger, so the power increases, and there are concerns about compression efficiency, noise and vibration.

[0015] The present invention is completed in view of the above-mentioned actual situation in the past, and the problem to be solved is to provide a double-rotating scroll compressor that can suppress the reduction of compression efficiency, noise and vibration by suppressing the enlargement of the bearing used to support the scroll on the side where the discharge valve is set relative to the casing so that it can rotate.

[0016] Solutions to Solve Problems

[0017] The twin-rotating scroll compressor of the present invention comprises:

[0018] A housing having a suction chamber for sucking fluid from the outside and a discharge chamber for discharging the fluid to the outside;

[0019] A first scroll disposed in the housing; and

[0020] A second scroll is disposed in the housing and is opposite to the first scroll, and a compression chamber for compressing fluid is formed between the second scroll and the first scroll.

[0021] The first scroll has a first end plate and a first scroll body which is integral with the first end plate and protrudes in a spiral shape toward the second scroll.

[0022] The second scroll has a second end plate and a second scroll body which is integral with the second end plate and protrudes in a spiral shape toward the first scroll.

[0023] The twin-rotary scroll compressor is characterized in that:

[0024] The first scroll has a bearing cover fixed to an end surface of the first end plate on the side opposite to the compression chamber.

[0025] A discharge valve chamber constituting a part of the discharge chamber is formed between the first end plate and the bearing cover.

[0026] The first end plate is formed with a discharge port that connects the compression chamber with the discharge valve chamber.

[0027] The discharge valve chamber is provided with a discharge valve for opening and closing the discharge port.

[0028] The bearing cover body comprises: a cover portion covering a portion of the discharge valve chamber and a portion of the discharge valve; and a protrusion extending cylindrically from the inner peripheral side of the cover portion to the side opposite to the compression chamber, and the inner space of the protrusion is communicated with the discharge valve chamber.

[0029] A bearing that rotatably supports the first scroll is provided on an outer peripheral surface of the boss portion.

[0030] In the twin-rotating scroll compressor of the present invention, a bearing cover is fixed to the end surface of the first end plate on the side opposite to the compression chamber in the first scroll. A discharge valve chamber constituting a part of the discharge chamber is formed between the first end plate and the bearing cover, and a discharge port for connecting the compression chamber with the discharge valve chamber is formed on the first end plate, and a discharge valve for opening and closing the discharge port is provided in the discharge valve chamber.

[0031] The bearing cover body has a cover portion and a protrusion portion. The cover portion covers a portion of the discharge valve chamber and a portion of the discharge valve. The inner space of the protrusion portion is connected to the discharge valve chamber. Therefore, the fluid compressed by the compression chamber is discharged to the discharge chamber including the discharge valve chamber and the inner space of the protrusion portion through the discharge port. In addition, a bearing is provided on the outer peripheral surface of the protrusion portion.

[0032] Here, in the above-mentioned conventional compressor in which the discharge valve is accommodated in the internal space of the protrusion, the internal space of the protrusion is necessarily larger than the discharge valve. In this regard, in the twin-rotating scroll compressor of the present invention in which a discharge valve chamber for accommodating the discharge valve is provided between the bearing cover having the protrusion and the first end plate, the internal space of the protrusion can be set regardless of the size of the discharge valve.

[0033] Therefore, in this twin-rotating scroll compressor, the boss can be made smaller than in the conventional compressor in which the internal space of the boss is necessarily larger than the discharge valve. As a result, the bearing provided on the outer peripheral surface of the boss can also be made smaller.

[0034] Therefore, the twin-rotating scroll compressor of the present invention can suppress an increase in the size of a bearing for rotatably supporting the scroll on the side where the discharge valve is provided with respect to the casing, thereby suppressing a decrease in compression efficiency, noise, and vibration.

[0035] Preferably, the discharge valve is a discharge reed valve having a front end valve portion for opening and closing the discharge port and a base end fixing portion for fixing the discharge valve to the first end plate. Also, preferably, the base end fixing portion is covered by a cover portion.

[0036] In this case, even if the bolts or the like for fixing the base end fixing portion are temporarily loosened, the cover portion can suppress the bolts from falling off.

[0037] Preferably, the distal end valve portion is arranged at a position closer to the center of the boss portion than the proximal end fixing portion.

[0038] In this case, the front end valve portion is arranged near the center of the convex portion, so the discharge port opened and closed by the front end valve portion is also set near the center of the convex portion. In addition, the center of the convex portion where the bearing of the first scroll is provided is also the rotation center of the first scroll. Therefore, the fluid that is further compressed in the compression chamber can be discharged from the discharge port, which is advantageous in improving the compression efficiency.

[0039] Preferably, at least the first end plate of the first end plate and the second end plate has: a bulging portion bulging toward the first end plate or the second end plate opposite thereto; a non-bulging portion located on the outer peripheral side of the bulging portion; and an end plate side step portion connected to the bulging portion and the non-bulging portion, and the first vortex body or the second vortex body protruding from the first end plate or the second end plate opposite thereto has: a vortex main body; a vortex short portion protruding shorter than the vortex main body to avoid interference with the bulging portion; and a vortex body side step portion connected to the vortex main body and the vortex short portion. Furthermore, preferably, the discharge valve chamber is formed by a recessed portion that is recessed from the end face of the first end plate toward the compression chamber in the region where the bulging portion is provided.

[0040] In this case, a discharge valve chamber is formed in the first end plate in the area where the bulge is provided. The first end plate has a non-bulge on the outer peripheral side of the bulge, and only a portion of the first end plate is provided as a thick wall. Therefore, compared with the case where the entire first end plate is provided as a thick wall in order to provide the discharge valve chamber, the weight of the first end plate can be suppressed. In addition, compared with the distance between the first end plate and the second end plate where the bulge is not formed, the distance between the first end plate and the second end plate is shortened by forming the bulge, and accordingly, the volume of the compression chamber divided between the first end plate and the second end plate is reduced, and the compression efficiency can be improved.

[0041] Preferably, an oil return passage is provided which opens on the inner peripheral surface of the discharge valve chamber, extends from the inner peripheral surface of the discharge valve chamber toward the outer peripheral side, and connects the discharge valve chamber with the suction chamber or the compression chamber.

[0042] In this case, the discharge valve chamber rotates during the operation of the compressor, and centrifugal force acts on the fluid discharged from the discharge port into the discharge valve chamber. As a result, the oil is centrifugally separated from the fluid. In addition, the oil separated from the fluid is acted upon by the centrifugal force in the discharge valve chamber and flows toward the outer peripheral side. In addition, a portion of the discharge valve chamber is covered by the cover portion, so the cover portion blocks most of the outflow of the oil from the discharge valve chamber toward the internal space of the protrusion.

[0043] As a result, the oil in the discharge valve chamber is easily introduced into the oil return passage opened on the inner peripheral surface of the discharge valve chamber. The oil introduced into the oil return passage flows toward the outer peripheral side under the centrifugal force and flows out to the suction chamber. The oil flowing out to the suction chamber can play the role of oil lubrication and oil sealing in the part requiring lubricity and sealing.

[0044] Effects of the Invention

[0045] According to the twin-rotating scroll compressor of the present invention, it is possible to suppress an increase in the size of a bearing for rotatably supporting the scroll on the side where the discharge valve is provided with respect to the casing, thereby suppressing a decrease in compression efficiency, noise, and vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a cross-sectional view of the twin-rotary scroll compressor of Example 1.

[0047] Figure 2 The present invention relates to the twin-rotating scroll compressor of the first embodiment and is a partial cross-sectional view showing an enlarged view of a main part.

[0048] Figure 3 The present invention relates to a twin-rotary scroll compressor of Embodiment 1, and shows a partial cross-sectional view of a second protrusion of a bearing cover.

[0049] Figure 4 The twin-rotating scroll compressor according to the first embodiment is an exploded perspective view showing a driven scroll body, a spacer, and a bearing cover, and is a view seen from the front side.

[0050] Figure 5 The present invention relates to the twin-rotating scroll compressor of the first embodiment and is a perspective view of a driven scroll body viewed from the front.

[0051] Figure 6 The present invention relates to the twin-rotating scroll compressor of the first embodiment and is a partial front view of a portion of a discharge valve chamber in a movable scroll body as viewed from the front.

[0052] Figure 7 This is an explanatory diagram for explaining the shapes of a driving end plate and a driving scroll body while relating to the twin-rotating scroll compressor of the first embodiment, viewing the driving scroll from the front.

[0053] Figure 8 The present invention relates to the twin-rotating scroll compressor of the first embodiment and is an explanatory diagram for explaining the shapes of a driven end plate and a driven scroll body while viewing the driven scroll from the front.

[0054] Fig. 9 The present invention relates to a twin-rotating scroll compressor of Example 2 and is a partial cross-sectional view showing an enlarged main portion.

[0055] Fig.10 The present invention relates to a twin-rotating scroll compressor of the second embodiment and is a partial front view of a portion of a discharge valve chamber in a movable scroll body as viewed from the front. DETAILED DESCRIPTION

[0056] Hereinafter, Examples 1 and 2 which embody the present invention will be described with reference to the drawings.

[0057] (Example 1)

[0058] like Figure 1 As shown, the twin-rotating scroll compressor (hereinafter referred to as a compressor) of the first embodiment includes a housing 60, an electric motor 10, an inverter circuit 70, a driving scroll 30, a driven scroll 40, and a driven mechanism 20. The compressor is mounted on a vehicle (not shown) and constitutes a vehicle air conditioner.

[0059] In this embodiment, using Figure 1 The solid arrows shown in FIG. 1 define the front-rear direction of the compressor. The front-rear direction is an example for convenience of description, and the compressor can change its posture appropriately depending on the vehicle on which it is installed.

[0060] In this embodiment, the driven scroll 40, the driven end plate 41 described later, and the driven scroll body 43 described later are respectively equivalent to the "first scroll", "first end plate", and "first scroll body" in the present invention. In addition, the driving scroll 30, the driving end plate 31 described later, and the driving scroll body 33 described later are respectively equivalent to the "second scroll", "second end plate", and "second scroll body" in the present invention.

[0061] The housing 60 is composed of a housing body 61, a cover 65, and an inverter housing 67. The housing body 61 is a bottomed cylindrical member having a first outer peripheral wall 62 and a first bottom wall 63. The first outer peripheral wall 62 is cylindrical with the drive axis R1 as the center. The drive axis R1 is parallel to the front-to-back direction. In addition, the first outer peripheral wall 62 has an inner peripheral surface 62B. The first bottom wall 63 is located at the rear end of the housing body 61. The first bottom wall 63 extends in a substantially circular flat plate shape orthogonal to the drive axis R1.

[0062] 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 shaft support 64 protruding forward is provided at the center of the inner surface of the first bottom wall 63. The inner ring of the bearing 71 is fitted outside the shaft support 64.

[0063] The cover 65 is arranged in front of the housing body 61. The cover 65 extends in a substantially circular flat plate shape perpendicular to the drive axis R1. The cover 65 is fastened to the first outer peripheral wall 62 by bolts (not shown) in a state where its outer peripheral edge abuts against the front end of the first outer peripheral wall 62 of the housing body 61. Thus, the cover 65 blocks the housing body 61 from the front. In this way, a suction chamber 61A is formed in the housing body 61.

[0064] A cylindrical shaft support portion 66 centered on the driven shaft center R2 is protruded from the center of the inner surface of the cover 65. The driven shaft center R2 is eccentric with respect to the driving shaft center R1 and extends parallel to the driving shaft center R1. That is, the driven shaft center R2 is also parallel to the front-rear direction. The outer ring of the needle roller bearing 72 is embedded in the shaft support portion 66. The needle roller bearing 72 is an example of a "bearing" in the present invention.

[0065] The cover 65 is formed with a suction connection port 65A, a discharge connection port 65B and a discharge portion 65C. The suction connection port 65A is located between the outer peripheral edge of the cover 65 and the shaft support portion 66, and penetrates the cover 65 in a direction parallel to the drive axis R1. The suction connection port 65A connects the suction chamber 61A with the outside of the compressor. A pipe is connected to the suction connection port 65A. Thus, the low-temperature and low-pressure refrigerant gas that has passed through the evaporator is sucked into the suction chamber 61A through the pipe. The refrigerant gas is an example of a "fluid" in the present invention.

[0066] The discharge portion 65C is recessed in the rear surface 651 of the cover 65 at a central position of the cover 65. The discharge communication port 65B penetrates the cover 65 in a direction parallel to the drive axis R1 in a manner of communicating with the discharge portion 65C. A pipe not shown is connected to the discharge communication port 65B, and the discharge communication port 65B allows the refrigerant gas discharged to the discharge portion 65C to flow toward the condenser. It should be noted that the piping, evaporator, and condenser are omitted in the illustration.

[0067] The inverter housing 67 is arranged at the rear of the housing body 61. The inverter housing 67 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 with the drive axis R1 as the center. The second bottom wall 69 is located at the rear end of the inverter housing 67. The second bottom wall 69 extends in a substantially circular flat plate shape orthogonal to the drive axis R1. The outer peripheral edge of the second bottom wall 69 is connected to the rear end of the second outer peripheral wall 68.

[0068] The inverter housing 67 is fastened to the first bottom wall 63 by bolts (not shown) in a state where the front end of the second peripheral wall 68 abuts against the rear surface of the first bottom wall 63. Thus, the inverter housing 67 forms an inverter chamber 67A between the inverter housing 67 and the first bottom wall 63. The inverter chamber 67A is adjacent to the suction chamber 61A at the rear of the suction chamber 61A. In addition, the inverter chamber 67A is divided relative to the suction chamber 61A by the first bottom wall 63. It should be noted that, although not shown in the figure, a connector portion is provided in the inverter housing 67.

[0069] The electric motor 10 is accommodated in the suction chamber 61A. Thus, the suction chamber 61A also serves as a motor chamber for accommodating the electric motor 10. The electric motor 10 is composed of a stator 17 and a rotor 11.

[0070] The stator 17 is cylindrical centered on the drive axis R1 and has a winding 18. The stator 17 is fixed to the case body 61 and thus the case 60 by being fitted into the inner peripheral surface 62B of the first outer peripheral wall 62 of the case body 61.

[0071] The rotor 11 is cylindrical around the driving axis R1 and is disposed in 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 to which the permanent magnets are fixed.

[0072] The inverter circuit 70 is accommodated in the inverter chamber 67A. The inverter circuit 70 is composed of a circuit substrate 70A and a switching element 70B provided on the circuit substrate 70A. The inverter circuit 70 fixes the circuit substrate 70A to the rear surface of the first bottom wall 63 using bolts not shown in the figure. The inverter circuit 70 is electrically connected to the battery (not shown) of the vehicle through a connector provided on the inverter housing. In addition, the inverter circuit 70 is electrically connected to the stator 17 through an airtight passage (not shown) provided on the first bottom wall 63. As a result, the inverter circuit 70 converts the DC current supplied from the battery into AC current while supplying power to the stator 17.

[0073] The driving scroll 30 includes a driving end plate 31 , a driving peripheral wall 32 , and a driving scroll body 33 .

[0074] The driving end plate 31 extends in a substantially disk shape orthogonal to the driving axis R1. The driving 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 protrusion 34 is formed at the center of the rear surface 312 and protrudes toward the first bottom wall 63. The first protrusion 34 is cylindrical with the driving axis R1 as the center.

[0075] The driving end plate 31 is provided with a suction port 35. The suction port 35 is disposed at a position closer to the outer periphery than the first protrusion 34. The suction port 35 is separated from the driving axis R1 in the radial direction of the driving end plate 31 than the first protrusion 34. The suction port 35 is formed in a substantially elliptical shape extending in the circumferential direction of the driving end plate 31. Figure 1 As shown, the suction port 35 penetrates the driving end plate 31 in the driving axis R1 direction, that is, in the front-rear direction. It should be noted that the shape and number of the suction ports 35 can be designed appropriately.

[0076] The driving peripheral wall 32 is formed integrally with the driving end plate 31 and extends from the outer peripheral edge of the driving end plate 31 toward the front, that is, toward the driven scroll 40 in parallel with the driving axis R1. Figure 7 As shown in FIG. 1 , the driving peripheral wall 32 is substantially cylindrical with the driving axis R1 as the center. Four fixing holes 32A are formed at the front end of the driving peripheral wall 32. Figure 1In the figure, two of the four fixing holes 32A are shown.

[0077] The driving scroll body 33 is formed integrally with the driving end plate 31 and is located inside the driving peripheral wall 32. Figure 1 As shown in FIG. 1 , the driving scroll body 33 extends forward from the front surface 311 of the driving end plate 31 in parallel with the driving axis R1. Figure 7 As shown, the driving scroll body 33 spirals around the driving axis R1. More specifically, when viewed from the front, the driving scroll body 33 spirals clockwise around the driving axis R1 from the scroll center.

[0078] like Figure 4 As shown, the driven scroll 40 is composed of a driven scroll body 40A, a bearing cover 40B, and a spacer 40C. The driven scroll body 40A has a driven end plate 41 and a driven scroll body 43 .

[0079] The driven end plate 41 extends in a substantially disk shape perpendicular to the driven axis R2. The driven end plate 41 has a front surface 411 and a rear surface 412 located opposite to the front surface 411. The front surface 411 corresponds to the "end surface of the first end plate opposite to the compression chamber" in the present invention.

[0080] A discharge valve chamber 44 is formed on the front surface 411 of the driven end plate 41. The discharge valve chamber 44 is composed of a recessed portion 50 formed by partially recessing the front surface 411 toward a compression chamber 55 described later, and is divided by a recessed portion bottom surface 50A and a recessed portion inner peripheral surface 50B. Figure 2 as well as Figure 5 As shown, the recess 50 is composed of a first recess 51 , a second recess 52 and a third recess 53 . The first recessed portion 51, the second recessed portion 52, and the third recessed portion 53 become deeper in sequence. That is, the first recessed portion 51 is the shallowest and the third recessed portion 53 is the deepest.

[0081] like Figure 2 as well as Figure 6 As shown in the figure, the concave bottom surface 50A of the concave portion 50 has a first concave bottom surface 51A, a second concave bottom surface 52A and a third concave bottom surface 53A. The concave inner peripheral surface 50B of the concave portion 50 has a first concave inner peripheral surface 51B, a second concave inner peripheral surface 52B and a third concave inner peripheral surface 53B. The first concave portion 51 is divided by the first concave bottom surface 51A and the first concave inner peripheral surface 51B. The second concave portion 52 is divided by the second concave bottom surface 52A and the second concave inner peripheral surface 52B. The third concave portion 53 is divided by the third concave bottom surface 53A and the third concave inner peripheral surface 53B.

[0082] The inner peripheral surface 51B of the first recess is circular, and the first recess 51 has a circular outer shape centered on the driven axis R2. The outer shape of the third recess 53 roughly corresponds to the outer shape of the discharge valve mechanism 56, and the depth of the third recess 53 is slightly larger than the thickness of the discharge valve mechanism 56. That is, the size of the third recess 53 is set to be able to accommodate the discharge valve mechanism 56. In the circular first recess 51, the third recess 53 is located at a position biased to one side relative to the driven axis R2, and the second recess 52 extends from the outer edge of the third recess 53 to the other side.

[0083] The driven end plate 41 is provided with a discharge port 45 that penetrates the driven end plate 41 in the front-rear direction. One end of the discharge port 45 opens to a compression chamber 55 described later, and the other end of the discharge port 45 opens to the third recess bottom surface 53A, and the discharge port 45 connects the compression chamber 55 with the discharge valve chamber 44.

[0084] like Figure 2 as well as Figure 6 As shown in FIG. 1 and FIG. 2 , a discharge valve mechanism 56 is disposed in the discharge valve chamber 44. Specifically, the discharge valve mechanism 56 is disposed in the third recess 53 in the recess 50 forming the discharge valve chamber 44. Figure 6 In FIG. 1 , the discharge valve mechanism 56 is indicated by a two-dot chain line.

[0085] The discharge valve mechanism 56 includes a discharge reed valve 57, a retainer 58, and a fixing bolt 59. The discharge reed valve 57 is an example of a "discharge valve" in the present invention. The discharge reed valve 57 and the retainer 58 are fixed to the bottom surface 53A of the third recess by the fixing bolt 59. The discharge reed valve 57 can open and close the discharge port 45. In addition, the retainer 58 can adjust the opening of the discharge reed valve 57.

[0086] like Figure 6 As shown in FIG. 1 , the discharge reed valve 57 includes a front end valve portion 57A and a base end fixing portion 57B. The front end valve portion 57A opens and closes the discharge port 45 and is disposed near the driven axis R2. Specifically, in the front-to-back direction, the driven axis R2 is located inside the outer edge of the front end valve portion 57A. The base end fixing portion 57B is fixed to the bottom surface 53A of the third recess by a fixing bolt 59. Figure 2 as well as Figure 6 As shown in the figure, the discharge port 45 is arranged near the driven axis R2, and the base end fixing portion 57B is arranged at a predetermined distance from the driven axis R2. That is, the front end valve portion 57A that opens and closes the discharge port 45 is arranged near the driven axis R2 compared to the base end fixing portion 57B. In other words, the front end valve portion 57A is arranged at a position closer to the center of the second protrusion 48 described later than the base end fixing portion 57B.

[0087] like Figure 2 as well as Figure 6As shown, the driven end plate 41 is provided with an oil return passage 54. The oil return passage 54 includes a groove 541 recessed in the front surface 411 of the driven end plate 41 and a hole 542 penetrating the driven end plate 41 in the front-rear direction.

[0088] One end of the inner circumference of the groove portion 541 opens at the first recessed inner circumferential surface 51B. The groove portion 541 extends linearly from one end of the inner circumferential side toward the outer circumferential side. The other end of the outer circumferential side of the groove portion 541 is connected to the front end of the hole portion 542. The hole portion 542 extends linearly in the front-to-back direction. The rear end of the hole portion 542 connected to the other end of the groove portion 541 opens at the rear surface 412 of the driven end plate 41. The opening position of the hole portion 542 becomes the suction chamber 61A. In detail, the hole portion 542 opens at a position that is closer to the outer circumferential side than the driven scroll body 43 and just outside the closed start portion of the compression chamber 55 described later. In this way, the oil return passage 54 connects the discharge valve chamber 44 with the suction chamber 61A. The first recessed inner circumferential surface 51B is an example of the "inner circumferential surface of the discharge valve chamber" in the present invention for the oil return passage 54 described later to open.

[0089] The driven scroll body 43 is formed integrally with the driven end plate 41 and extends from the rear surface 412 of the driven end plate 41 toward the rear, that is, toward the driving scroll 30 in parallel with the driven axis R2. Figure 8 As shown, the driven scroll body 43 is spirally swirled about the driven axis R2. More specifically, when viewed from the front, the driven scroll body 43 is formed to spiral clockwise about the driven axis R2 from the scroll center.

[0090] like Figure 1 As shown in FIG. 1 , the driven mechanism 20 is composed of four rotation preventing pins 21 and four rings 22. It should be noted that the number of the rotation preventing pins 21 and the rings 22 can be appropriately designed as long as they are three or more. Figure 1 In the figure, two of each of the rotation preventing pins 21 and the rings 22 are shown.

[0091] The respective rotation preventing pins 21 are fixed while being inserted through the respective fixing holes 32A of the driving peripheral wall 32. Thus, the respective rotation preventing pins 21 are fixed to the driving peripheral wall 32 in a state of protruding forward from the driving peripheral wall 32.

[0092] 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 provided in a recessed manner on the rear surface 412 of the driven end plate 41.

[0093] The gasket 40C is in the shape of a disk, and a communication port 46 is provided through the center of the gasket 40C. The diameter of the communication port 46 is set to be the same as the inner diameter d of the second protrusion 48 described later. The gasket 40C is sandwiched between the front surface 411 of the driven end plate 41 and the rear surface 472 of the cover portion 47 described later, and the space between the two is sealed.

[0094] The bearing cover 40B includes a cover portion 47 and a second protrusion 48 formed integrally with the cover portion 47. The second protrusion 48 corresponds to the "protrusion portion" in the present invention.

[0095] The cover portion 47 extends in a generally disk-like shape perpendicular to the driven axis R2. The cover portion 47 has a front surface 471 and a rear surface 472 located on the opposite side of the front surface 471. A through hole 47A is formed in the center of the cover portion 47. The second protrusion 48 protrudes forward from the inner peripheral edge of the cover portion 47, that is, the center of the front surface 471 of the cover portion 47. The second protrusion 48 extends in a cylindrical shape in the direction of the driven axis R2 with the driven axis R2 as the center. The inner diameter d of the cylindrical internal space 48A of the second protrusion 48 and the outer diameter D of the second protrusion 48 are larger than the length L of the longest part of the discharge reed valve 57 (refer to Figure 3 as well as Figure 6 ) is short. It should be noted that, in a plan view from the front-rear direction, the outer edge of the internal space 48A of the second protrusion 48 is located inside the outer edge of the third recess 53, that is, the inner side of the third recess inner peripheral surface 53B. In addition, in this compressor, the discharge chamber is composed of the discharge valve chamber 44, the internal space 48A and the discharge portion 65C.

[0096] like Figure 4 As shown in the figure, four bolt insertion holes 49 are respectively provided through the outer peripheral edge of the driven end plate 41 of the driven scroll body 40A, the gasket 40C and the cover portion 47 of the bearing cover body 40B. The driven scroll body 40A and the bearing cover body 40B are integrally connected by bolts (not shown) inserted through the bolt insertion holes 49 while sandwiching the gasket 40C. It should be noted that the connection between the driven scroll body 40A and the bearing cover body 40B is performed after the discharge valve mechanism 56 is arranged in the discharge valve chamber 44 and the discharge reed valve 57 and the retainer 58 are fixed to the bottom surface 53A of the third recessed portion by the fixing bolts 59.

[0097] When the driven scroll body 40A is combined with the bearing cover 40B, most of the discharge valve chamber 44 and most of the discharge valve mechanism 56 are covered by the cover portion 47 of the bearing cover 40B. Specifically, in the recess 50 forming the discharge valve chamber 44, the entire first recess 51, the entire second recess 52, and a portion of the third recess 53 are covered by the cover portion 47.

[0098] In this compressor, the driving scroll 30 and the driven scroll 40 are both arranged in the suction chamber 61A. And 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 addition, in the driving scroll 30, the outer ring of the bearing 71 is embedded in the first protrusion 34. Thus, the driving scroll 30 is supported by the casing body 61 so as to be rotatable around the driving axis R1. Here, in this compressor, the driving scroll 30 is supported by the casing body 61 and then the casing 60 in a so-called cantilever state.

[0099] On the other hand, the driven scroll 40 is arranged in front of the driving scroll 30 in a state where the driven scroll body 43 is facing the driving scroll 30 side. As a result, the front surface 311 of the driving end plate 31 and the rear surface 412 of the driven end plate 41 are opposite to each other in the driving axis R1 direction and the driven axis R2 direction. In addition, the driving scroll 30 and the driven scroll 40 mesh the driving scroll body 33 with the driven scroll body 43 on the inner side of the driving peripheral wall 32 and make each rotation prevention pin 21 enter each ring 22. In this way, the driving scroll 30 and the driven scroll 40 are assembled in the front-to-back direction. In addition, the driving scroll body 33 and the driven scroll body 43 form a compression chamber 55 between the two sides.

[0100] In the driven scroll 40, the inner ring of the needle bearing 72 is fitted outside the outer peripheral surface of the second protrusion 48. Thus, the driven scroll 40 is supported by the cover 65 so as to be rotatable around the driven axis R2. Here, in this compressor, the driven scroll 40 is also supported by the cover 65 and then the casing 60 in a so-called cantilever state.

[0101] Since the driven scroll 40 is supported by the cover 65, the internal space 48A of the second boss 48 faces the discharge portion 65C in the front-rear direction. The discharge port 45 and the front end valve portion 57A of the discharge reed valve 57 are located near the driven axis R2.

[0102] In the compressor, Figure 7 As shown, the driving end plate 31 of the driving scroll 30 has a driving side bulge 31A, a driving side non-bulge 31B and a driving end plate side step 31C. The driving side bulge 31A, the driving side non-bulge 31B and the driving end plate side step 31C are respectively equivalent to the "bulge", "non-bulge" and "end plate side step" in the present invention. In addition, the driving scroll body 33 of the driving scroll 30 has a driving scroll short portion 33A, a driving scroll main body 33B and a driving scroll body side step 33C. The driving scroll short portion 33A, the driving scroll main body 33B and the driving scroll body side step 33C are respectively equivalent to the "scroll short portion", "scroll main body" and "scroll body side step" in the present invention.

[0103] Likewise, if Figure 8As shown, the driven end plate 41 of the driven scroll 40 has a driven side bulge 41A, a driven side non-bulge 41B, and a driven end plate side step 41C. The driven side bulge 41A, the driven side non-bulge 41B, and the driven end plate side step 41C are respectively equivalent to the "bulge", "non-bulge", and "end plate side step" in the present invention. In addition, the driven scroll body 43 of the driven scroll 40 has a driven scroll short portion 43A, a driven scroll main body 43B, and a driven scroll body side step 43C. The driven scroll short portion 43A, the driven scroll main body 43B, and the driven scroll body side step 43C are respectively equivalent to the "scroll short portion", "scroll main body", and "scroll body side step" in the present invention.

[0104] like Figure 7 As shown in FIG. 1 , the driving side bulge 31A is formed on the front surface 311 of the driving end plate 31. The driving side bulge 31A extends clockwise along the driving scroll body 33 from the center side of the front surface 311, that is, near the driving axis R1 and near the vortex center of the driving scroll body 33, toward the outer peripheral side of the front surface 311. Figure 1 As shown in the figure, the driving side bulging portion 31A bulges toward the driven scroll body 43 more than the driving side non-bulging portion 31B which is a portion other than the driving side bulging portion 31A in the driving end plate 31. That is, the driving side bulging portion 31A is formed to be thicker than the driving side non-bulging portion 31B. The driving side non-bulging portion 31B is located on the outer periphery of the driving side bulging portion 31A in the driving end plate 31.

[0105] In addition, if Figure 7 As shown in the figure, the driving end plate side step portion 31C is formed at the boundary between the driving side bulging portion 31A and the driving side non-bulging portion 31B and is connected to the driving side bulging portion 31A and the driving side non-bulging portion 31B. It should be noted that the length of the driving side bulging portion 31A extending toward the outer peripheral side of the front surface 311, that is, the position where the driving end plate side step portion 31C is formed can be appropriately designed.

[0106] On the other hand, Figure 1 As shown in FIG. 4A , the driven side bulge 41A is formed on the rear surface 412 of the driven end plate 41. Figure 8 As shown, the driven side bulge 41A extends clockwise along the driven scroll body 43 from the central side of the rear surface 412, that is, near the driven axis R2 and near the scroll center of the driven scroll body 43, toward the outer peripheral side of the rear surface 412. Figure 1As shown in the figure, the driven side bulging portion 41A bulges toward the driving scroll body 33 more than the driven side non-bulging portion 41B which is a portion other than the driven side bulging portion 41A in the driven end plate 41. That is, the driven side bulging portion 41A is formed to be thicker than the driven side non-bulging portion 41B. The driven side non-bulging portion 41B is located on the outer periphery of the driven side bulging portion 41A in the driven end plate 41.

[0107] like Figure 8 As shown in the figure, the driven end plate side step portion 41C is formed at the boundary between the driven side bulging portion 41A and the driven side non-bulging portion 41B and is connected to the driven side bulging portion 41A and the driven side non-bulging portion 41B. It should be noted that the length of the driven side bulging portion 41A extending toward the outer peripheral side of the rear surface 412, that is, the position where the driven end plate side step portion 41C is formed can be appropriately designed.

[0108] The discharge port 45 opens to the driven side bulging portion 41A. Figure 2 As shown in FIG. 1 , the driven side bulge 41A overlaps with the discharge valve mechanism 56 in the front-to-back direction, that is, in the direction of the driven axis R2. That is, the second recess 52 and the third recess 53 in the recess 50 forming the discharge valve chamber 44 are arranged in the area corresponding to the driven side bulge 41A. Specifically, in a plan view from the front-to-back direction, the outer edges of the second recess 52 and the third recess 53 are both located inwardly relative to the outer edge of the driven side bulge 41A.

[0109] like Figure 7 As shown in FIG. 1 , the driving scroll short portion 33A extends from the center of the vortex in the driving scroll body 33 toward the outer peripheral side of the vortex. Figure 1 As shown in the figure, the driving scroll short portion 33A is opposed to the driven side bulge portion 41A when the driving scroll 30 and the driven scroll 40 are assembled in the front-rear direction. Here, the length of the driving scroll short portion 33A extending toward the driven end plate 41, that is, the length in the driving axis R1 direction is shorter than the length of the driving scroll main body 33B, which is the portion of the driving scroll body 33 other than the driving scroll short portion 33A, in the driving axis R1 direction.

[0110] In other words, the driving scroll main body 33B is the longest portion extending toward the driven end plate 41 in the driving scroll body 33. Therefore, the driving scroll short portion 33A is shorter in the driving axis R1 direction than the longest portion extending toward the driven end plate 41 in the driving scroll body 33. Thus, the driving scroll short portion 33A avoids interference with the driven side bulge 41A.

[0111] like Figure 7 As shown, the driving scroll body side step portion 33C is formed at the boundary between the driving scroll short portion 33A and the driving scroll main body portion 33B and is connected to the driving scroll short portion 33A and the driving scroll main body portion 33B.

[0112] like Figure 8 As shown in FIG. 4 , the driven scroll short portion 43A extends from the center of the scroll in the driven scroll body 43 toward the outer peripheral side of the scroll. Figure 1 As shown in the figure, the driven scroll short portion 43A is opposite to the driving side bulge portion 31A when the driving scroll 30 and the driven scroll 40 are assembled in the front-to-back direction. Here, the length of the driven scroll short portion 43A extending toward the driving end plate 31, that is, the length in the driven axis R2 direction is shorter than the length of the driven scroll main body 43B, which is the portion of the driven scroll body 43 other than the driven scroll short portion 43A, in the driven axis R2 direction.

[0113] In other words, the driven scroll main body 43B is the longest portion extending toward the driving end plate 31 in the driven scroll body 43. Therefore, the driven scroll short portion 43A is shorter in the driven axis R2 direction than the longest portion extending toward the driving end plate 31 in the driven scroll body 43. Thus, the driven scroll short portion 43A avoids interference with the driving side bulge 31A.

[0114] like Figure 8 As shown, the driven scroll body side step portion 43C is formed at the boundary between the driven scroll short portion 43A and the driven scroll main body portion 43B and is connected to the driven scroll short portion 43A and the driven scroll main body portion 43B.

[0115] In the compressor configured as described above, the electric motor 10 is operated by controlling the operation of the electric motor 10 while the inverter circuit 70 supplies power to the stator 17. As a result, the rotor 11 rotates, and the driving scroll 30 is driven to rotate around the driving axis R1 in the suction chamber 61A. That is, the driving scroll 30 is driven to rotate integrally with the rotor 11. At this time, in the driven mechanism 20, each anti-rotation pin 21 is in sliding contact with the inner circumferential surface of each ring 22, and each ring 22 is relatively rotated around the center of each anti-rotation pin 21. In this way, the driven mechanism 20 transmits the torque of the driving scroll 30 to the driven scroll 40.

[0116] As a result, the driven scroll 40 is driven to rotate 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 driven scroll 40 revolves relatively with respect to the driving scroll 30 around the driving axis R1 under the action of the driving scroll 30 and the driven scroll 40, thereby changing the volume of the compression chamber 55.

[0117] Therefore, the refrigerant gas in the suction chamber 61A is sucked into the compression chamber 55 through the suction port 35 and compressed by the compression chamber 55. Furthermore, the refrigerant gas compressed to the discharge pressure by the compression chamber 55 is discharged from the discharge port 45 to the discharge valve chamber 44, and then discharged to the discharge portion 65C through the internal space 48A of the second protrusion 48, and discharged to the condenser from the discharge connection port 65B. In this way, air conditioning is performed by the vehicle air conditioning device.

[0118] Here, in this compressor, the driven scroll 40 has a driven scroll body 40A and a bearing cover 40B. A discharge valve chamber 44 for accommodating a discharge valve mechanism 56 is formed in a driven end plate 41 of the driven scroll body 40A. The bearing cover 40B has a cover portion 47 covering the discharge valve chamber 44 and most of the discharge valve mechanism 56, and a second protrusion 48 on which a needle bearing 72 is mounted, and an internal space 48A of the second protrusion 48 connects the discharge valve chamber 44 with the discharge portion 65C.

[0119] According to this structure, in this compressor, the discharge valve mechanism 56 is not accommodated in the internal space 48A of the second protrusion 48, so it is not necessary to make the internal space 48A of the second protrusion 48 larger than the discharge valve mechanism 56. Therefore, in this compressor, the driven end plate is integrally provided with a protrusion to which a driven side bearing that supports the driven scroll to be rotatable relative to the housing is mounted, and the internal space 48A of the second protrusion 48 can be reduced compared with the above-mentioned conventional compressor in which the discharge valve is accommodated in the protrusion. As a result, the inner diameter d of the internal space 48A of the second protrusion 48 and the outer diameter D of the second protrusion 48 are shorter than the length L of the longest part of the discharge reed valve 57. Therefore, the needle bearing 72 mounted on the outer peripheral surface of the second protrusion 48 can also be smaller than that of the above-mentioned conventional compressor.

[0120] Therefore, the compressor of the embodiment can suppress an increase in size of the needle bearing 72 that is a bearing for rotatably supporting the driven scroll 40 provided with the discharge valve mechanism 56 relative to the casing 60 , thereby suppressing a decrease in compression efficiency, noise, and vibration.

[0121] In addition, in this compressor, the base end fixing portion 57B of the discharge reed valve 57 is covered by the cover portion 47. Therefore, even if the fixing bolt 59 is temporarily loosened, the cover portion 47 can prevent the fixing bolt 59 from falling off. In addition, the front end valve portion 57A of the discharge reed valve 57 is arranged near the driven axis R2, and the discharge port 45 opened and closed by the front end valve portion 57A is also set near the driven axis R2. Therefore, the fluid that is further compressed in the compression chamber 55 can be discharged from the discharge port 45, which is advantageous in improving the compression efficiency.

[0122] Furthermore, in this compressor, a driving side bulge 31A is formed on the driving end plate 31 of the driving scroll 30, and a driven side bulge 41A and a driven side non-bulge 41B thinner than the driven side bulge 41A are formed on the driven end plate 41 of the driven scroll 40. Furthermore, the second recess 52 and the third recess 53 in the recess 50 forming the discharge valve chamber 44 are arranged in the area corresponding to the driven side bulge 41A in the driven end plate 41, and the outer edges of the second recess 52 and the third recess 53 are located at a position closer to the inside than the outer edge of the driven side bulge 41A.

[0123] Therefore, in this compressor, only a part of the driven end plate 41 is thickened, so that the weight of the driven end plate 41 can be suppressed compared with the case where the entire driven end plate 41 is thickened in order to provide the discharge valve chamber 44. In addition, compared with the distance between the driven end plate without the driven side bulge 41A and the driving end plate without the driving side bulge 31A, the distance between the driven side bulge 41A and the driving side bulge 31A is shortened, and accordingly, the volume of the compression chamber 55 divided between the driven side bulge 41A and the driving side bulge 31A is reduced, and the compression efficiency can be improved.

[0124] In addition, in this compressor, the discharge port 45 opens at the third recess bottom surface 53A of the deepest third recess 53 among the recesses 50 forming the discharge valve chamber 44. And one end of the inner peripheral side of the oil return passage 54 opens at the circular first recess inner peripheral surface 51B of the shallowest first recess 51 among the recesses 50. The oil return passage 54 extends toward the outer peripheral side, and the other end of the outer peripheral side of the oil return passage 54 opens at the suction chamber 61A. That is, the discharge valve chamber 44 is connected to the suction chamber 61A through the oil return passage 54.

[0125] In this case, since centrifugal force acts on the fluid discharged from the discharge port 45 into the rotating discharge valve chamber 44, the oil is centrifugally separated from the fluid. And the oil separated from the fluid is acted on by the centrifugal force in the discharge valve chamber 44 and goes to the outer peripheral side. In addition, most of the opening of the recess 50 forming the discharge valve chamber 44, that is, the whole of the first recess 51, the whole of the second recess 52, and most of the third recess 53 are covered by the cover portion 47. Therefore, the cover portion 47 blocks most of the outflow of oil from the discharge valve chamber 44 toward the internal space 48A of the second protrusion 48 in the direction of the driven axis R2. In addition, in the discharge valve chamber 44, the oil can be accumulated in the second recess 52 which is provided outside the third recess 53 accommodating the discharge valve mechanism 56 and is deeper than the first recess 51. And the oil in the first recess 51 is guided to the oil return passage 54 along the circular inner peripheral surface 51B of the first recess.

[0126] Thus, the oil in the discharge valve chamber 44 is easily introduced into the oil return passage 54 opened on the first recessed inner peripheral surface 51B. The oil introduced into the oil return passage 54 flows toward the outer peripheral side due to the centrifugal force and flows out to the suction chamber 61A. The oil flowing out to the suction chamber 61A can play the role of oil lubrication and oil sealing at the part requiring lubricity and sealing.

[0127] (Example 2)

[0128] like Fig. 9 as well as Fig.10 As shown in FIG. 1 , in the compressor of the second embodiment, the first recess 51 is removed from the recess 50 forming the discharge valve chamber 44. In addition, one end of the inner peripheral side of the groove 541 of the oil return passage 54 is opened at the second recess inner peripheral surface 52B of the second recess 52. The second recess inner peripheral surface 52B is an example of the "inner peripheral surface of the discharge valve chamber" in the present invention to which the oil return passage 54 opens.

[0129] In this compressor, the oil centrifugally separated from the fluid discharged into the rotating discharge valve chamber 44 flows to the outer peripheral side under the action of centrifugal force in the discharge valve chamber 44. In addition, most of the opening of the recessed portion 50 forming the discharge valve chamber 44, that is, all of the second recessed portion 52 and most of the third recessed portion 53 are covered by the cover portion 47. Therefore, the cover portion 47 blocks most of the outflow of oil from the discharge valve chamber 44 toward the internal space 48A of the second protrusion 48 in the direction of the driven axis R2. In addition, in the discharge valve chamber 44, the oil can be accumulated in the second recessed portion 52 provided outside the third recessed portion 53 that accommodates the discharge valve mechanism 56.

[0130] Thus, the oil in the discharge valve chamber 44 is easily introduced into the oil return passage 54 opened at the second recessed inner peripheral surface 52B. The oil introduced into the oil return passage 54 flows toward the outer peripheral side due to the centrifugal force and flows out to the suction chamber 61A. The oil flowing out to the suction chamber 61A can play the role of oil lubrication and oil sealing at the part requiring lubricity and sealing.

[0131] The other structures and functions of the compressor are the same as those of the compressor of Example 1. The same structures are denoted by the same reference numerals and detailed descriptions of the structures are omitted.

[0132] As mentioned above, the present invention has been described in conjunction with Embodiments 1 and 2. However, the present invention is not limited to the above-mentioned Embodiments 1 and 2, and can be applied with appropriate changes without departing from the gist thereof.

[0133] For example, in the compressors of Embodiments 1 and 2, the orbiting scroll 40 is set as the first scroll, but the present invention is not limited thereto, and the driving scroll 30 may be set as the first scroll.

[0134] In the compressors of Embodiments 1 and 2, the suction port 35 is formed on the driving scroll 30 side as the second scroll, but the present invention is not limited thereto, and the suction port 35 may be provided on the driven scroll 40 side as the first scroll.

[0135] In the compressors of Examples 1 and 2, the driving side bulge 31A is formed on the driving end plate 31 of the driving scroll 30 as the second scroll, and the driven scroll short portion 43A is formed on the driven scroll body 43 of the driven scroll 40 as the first scroll, but the formation of the driving side bulge 31A with respect to the driving end plate 31 may be omitted, and the formation of the driven scroll short portion 43A with respect to the driven scroll body 43 may be omitted. In addition, the formation of the driven side bulge 41A with respect to the driven end plate 41 of the driven scroll 40 as the first scroll may be omitted, and the formation of the driving scroll short portion 33A with respect to the driving scroll body 33 of the driving scroll 30 as the second scroll may be omitted.

[0136] In Examples 1 and 2, the oil return passage 54 is formed by a groove portion 541 recessed in the front surface 411 of the driven end plate 41 and a hole portion 542 penetrating the driven end plate 41 in the thickness direction, but the invention is not limited thereto. The oil return passage may also be formed by a groove or a through hole provided in the cover portion 47 of the gasket 40C or the bearing cover body 40B.

[0137] In the first and second embodiments, the oil return passage 54 is communicated with the discharge valve chamber 44 and the suction chamber 61A, but the present invention is not limited thereto, and the oil return passage 54 may be communicated with the discharge valve chamber 44 and the compression chamber 55 .

[0138] In Examples 1 and 2, the recess 50 for forming the discharge valve chamber 44 is provided on the driven end plate 41 serving as the first end plate, but the present invention is not limited thereto. The recess 50 may be provided on the cover portion 47 of the bearing cover body 40B instead of the driven end plate 41, or the recess 50 may be provided on both the first end plate and the cover portion 47.

[0139] In the first and second embodiments, the entire discharge valve mechanism 56 is arranged in the area corresponding to the driven side bulging portion 41A of the driven end plate 41 as the first end plate, but the present invention is not limited thereto. For example, the base end fixing portion 57B may be arranged in the area corresponding to the bulging portion of the first end plate and the front end valve portion 57A may be arranged in the area corresponding to the non-bulging portion of the first end plate, or conversely, the front end valve portion 57A may be arranged in the area corresponding to the bulging portion of the first end plate and the base end fixing portion 57B may be arranged in the area corresponding to the non-bulging portion of the first end plate. In addition, in these cases, the recessed portion 50 may be provided on both the first end plate and the cover portion 47.

[0140] In the compressors of Examples 1 and 2, 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 method in which two pins are in sliding contact with the inner peripheral surface of a free ring, a pin-pin method in which the outer peripheral surfaces of two pins are in sliding contact with each other, a method using an Oldham coupling, etc.

[0141] In the compressors of Examples 1 and 2, 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. However, the present invention is not limited thereto, and the driving scroll 30 and the rotor 11 may be connected to each other in a power-transmitting manner by a driving shaft so that the driving scroll 30 and the rotor 11 are separated in the direction of the driving axis R1.

[0142] (Note 1)

[0143] A twin-rotating scroll compressor comprising:

[0144] A housing having a suction chamber for sucking fluid from the outside and a discharge chamber for discharging the fluid to the outside;

[0145] A first scroll disposed in the housing; and

[0146] A second scroll is disposed in the housing and is opposite to the first scroll, and a compression chamber for compressing fluid is formed between the second scroll and the first scroll.

[0147] The first scroll has a first end plate and a first scroll body which is integral with the first end plate and protrudes in a spiral shape toward the second scroll.

[0148] The second scroll has a second end plate and a second scroll body which is integral with the second end plate and protrudes in a spiral shape toward the first scroll.

[0149] The twin-rotary scroll compressor is characterized in that:

[0150] The first scroll has a bearing cover fixed to an end surface of the first end plate on the side opposite to the compression chamber.

[0151] A discharge valve chamber constituting a part of the discharge chamber is formed between the first end plate and the bearing cover.

[0152] The first end plate is formed with a discharge port that connects the compression chamber with the discharge valve chamber.

[0153] The discharge valve chamber is provided with a discharge valve for opening and closing the discharge port.

[0154] The bearing cover body comprises: a cover portion covering a portion of the discharge valve chamber and a portion of the discharge valve; and a protrusion extending cylindrically from the inner peripheral side of the cover portion to the side opposite to the compression chamber, and the inner space of the protrusion is communicated with the discharge valve chamber.

[0155] A bearing that rotatably supports the first scroll is provided on an outer peripheral surface of the boss portion.

[0156] (Note 2)

[0157] A twin-rotating scroll compressor according to Supplementary Note 1, wherein:

[0158] The discharge valve is a discharge reed valve having a front end valve portion for opening and closing the discharge port and a base end fixing portion for fixing the discharge valve to the first end plate.

[0159] The base end fixing portion is covered by the cover portion.

[0160] (Note 3)

[0161] A twin-rotating scroll compressor according to Supplementary Note 2, wherein:

[0162] The distal end valve portion is disposed at a position closer to the center of the boss portion than the proximal end fixing portion.

[0163] (Note 4)

[0164] A twin-rotating scroll compressor according to any one of Supplementary Notes 1 to 3, wherein:

[0165] At least the first end plate of the first end plate and the second end plate comprises: a bulging portion, which bulges toward the first end plate or the second end plate opposite thereto; a non-bulging portion, which is located on the outer peripheral side of the bulging portion; and an end plate side step portion, which is connected to the bulging portion and the non-bulging portion, and the first vortex body or the second vortex body protruding from the first end plate or the second end plate opposite thereto comprises: a vortex main body portion; a vortex short portion, which protrudes shorter than the vortex main body portion to avoid interference with the bulging portion; and a vortex body side step portion, which is connected to the vortex main body portion and the vortex short portion,

[0166] The discharge valve chamber is formed by a recessed portion that is recessed from the end surface of the first end plate toward the compression chamber in a region where the bulging portion is provided.

[0167] (Note 5)

[0168] A twin-rotating scroll compressor according to any one of Supplementary Notes 1 to 4, wherein:

[0169] The twin-rotating scroll compressor is provided with an oil return passage which opens on the inner peripheral surface of the discharge valve chamber, extends from the inner peripheral surface of the discharge valve chamber toward the outer peripheral side, and connects the discharge valve chamber with the suction chamber or the compression chamber.

[0170] Industrial Applicability

[0171] The present invention can be utilized in a vehicle air conditioning device or the like.

[0172] Description of Reference Numerals

[0173] 30 Driving scroll (second scroll)

[0174] 31 Drive end plate (second end plate)

[0175] 31A Driving side bulge (bulge)

[0176] 31B Non-bulging part on the driving side (non-bulging part)

[0177] 31C Drive end plate side step (end plate side step)

[0178] 33 Driving scroll (second scroll)

[0179] 33A Driving scroll short section (short scroll section)

[0180] 33B Driving scroll body (scroll body)

[0181] 33C Driving scroll side step (scroll side step)

[0182] 40 Idled scroll (first scroll)

[0183] 40B Bearing cover

[0184] 41 Driven end plate (first end plate)

[0185] 411 front surface (end face)

[0186] 41A Driven side bulge (bulge)

[0187] 41B Non-bulging part on the driven side (non-bulging part)

[0188] 41C Driven end plate side step (end plate side step)

[0189] 43 Driven scroll body (first scroll body)

[0190] 43A Driven scroll short section (short scroll section)

[0191] 43B Driven scroll body (scroll body)

[0192] 43C Step on the side of the driven scroll body (Step on the side of the scroll body)

[0193] 44 Discharge valve chamber (discharge chamber)

[0194] 45 Exhaust

[0195] 47 Hood

[0196] 48 Second protrusion (protrusion)

[0197] 48A Internal space (discharge chamber)

[0198] 50 recess

[0199] 51B Inner circumferential surface of first concave portion (inner circumferential surface)

[0200] 52B Second concave portion inner circumferential surface (inner circumferential surface)

[0201] 54 Oil return passage

[0202] 55 Compression Chamber

[0203] 57 Discharge reed valve (discharge valve)

[0204] 57A front valve

[0205] 57B Base end fixing part

[0206] 60 Shell

[0207] 61A Suction Chamber

[0208] 65C Discharge section (discharge chamber)

[0209] 72 Needle roller bearings (bearings).

Claims

1. A twin-rotary scroll compressor, comprising: A housing having a suction chamber for sucking fluid from the outside and a discharge chamber for discharging the fluid to the outside; A first scroll disposed in the housing; and A second scroll is disposed in the housing and is opposite to the first scroll, and a compression chamber for compressing fluid is formed between the second scroll and the first scroll. The first scroll has a first end plate and a first scroll body which 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 which is integral with the second end plate and protrudes in a spiral shape toward the first scroll. The twin-rotary scroll compressor is characterized in that: The first scroll has a bearing cover fixed to an end surface of the first end plate on the side opposite to the compression chamber. A discharge valve chamber constituting a part of the discharge chamber is formed between the first end plate and the bearing cover. The first end plate is formed with a discharge port that connects the compression chamber with the discharge valve chamber. The discharge valve chamber is provided with a discharge valve for opening and closing the discharge port. The bearing cover body comprises: a cover portion covering a portion of the discharge valve chamber and a portion of the discharge valve; and a protrusion extending cylindrically from the inner peripheral side of the cover portion to the side opposite to the compression chamber, and the inner space of the protrusion is communicated with the discharge valve chamber. A bearing that rotatably supports the first scroll is provided on an outer peripheral surface of the boss portion.

2. The twin-rotary scroll compressor according to claim 1, wherein: The discharge valve is a discharge reed valve having a front end valve portion for opening and closing the discharge port and a base end fixing portion for fixing the discharge valve to the first end plate. The base end fixing portion is covered by the cover portion.

3. The twin-rotary scroll compressor according to claim 2, wherein: The distal end valve portion is disposed at a position closer to the center of the boss portion than the proximal end fixing portion.

4. The twin-rotary scroll compressor according to any one of claims 1 to 3, wherein: At least the first end plate of the first end plate and the second end plate comprises: a bulging portion, which bulges toward the first end plate or the second end plate opposite thereto; a non-bulging portion, which is located on the outer peripheral side of the bulging portion; and an end plate side step portion, which is connected to the bulging portion and the non-bulging portion, and the first vortex body or the second vortex body protruding from the first end plate or the second end plate opposite thereto comprises: a vortex main body portion; a vortex short portion, which protrudes shorter than the vortex main body portion to avoid interference with the bulging portion; and a vortex body side step portion, which is connected to the vortex main body portion and the vortex short portion, The discharge valve chamber is formed by a recessed portion that is recessed from the end surface of the first end plate toward the compression chamber in a region where the bulging portion is provided. Type compressor.

5. The twin-rotary scroll compressor according to any one of claims 1 to 3, wherein: The twin-rotating scroll compressor is provided with an oil return passage which opens on the inner peripheral surface of the discharge valve chamber, extends from the inner peripheral surface of the discharge valve chamber toward the outer peripheral side, and connects the discharge valve chamber with the suction chamber or the compression chamber.

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