Dual rotation scroll compressor

Abstract

The drive mechanism (10) has a rotor (11) disposed on the outer peripheral surface of a drive scroll (30). The drive scroll (30) has, on the outer peripheral surface in the circumferential direction of the drive scroll, a first region (S) including a connection section (82) at which the outer peripheral end of the drive scroll (33) and the drive peripheral wall (32) are connected, and a part of the drive peripheral wall (32); and a second region including the drive peripheral wall (32) other than the drive peripheral wall (32) in the first region (S). The drive peripheral wall (32) in the first region (S) is a thick section (85) in which a first inner surface (83) facing the inside in the radial direction is positioned further toward the inside in the radial direction than a second inner surface (84) of the drive peripheral wall (32) in the second region. Recesses (87) and protrusions (114), which are torque transmission mechanisms from the rotor (11) to the drive scroll (30), are provided in a portion of the drive scroll (30) corresponding to the first region (S) and a portion of the rotor (11) corresponding to the first region (S).

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 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.

[0004] The driving scroll comprises a driving end plate, a driving peripheral wall, and a driving scroll body. The driving end plate extends in a direction intersecting the driving axis. The driving peripheral wall projects cylindrically from the driving end plate toward the driven scroll. The driving scroll body spirally projects from the driving end plate toward the driven scroll within the driving peripheral wall.

[0005] The driven scroll includes a driven end plate and a driven scroll body. The driven end plate extends in a direction intersecting the driven axis. The driven scroll body spirally protrudes from the driven end plate toward the driving scroll.

[0006] The driving scroll and the driven scroll form a compression chamber when the driving scroll body and the driven scroll body face each other. The volume of the compression chamber changes due to rotational driving and rotational following.

[0007] The drive mechanism includes a rotor that has a cylindrical shape and surrounds the driving scroll from the outer peripheral side and is fixed to the driving scroll.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application Laid-Open No. 2002-310073 Summary of the Invention

[0011] Problems to be solved by the invention

[0012] However, in the conventional twin-rotating scroll compressor, a predetermined torque transmission force must be ensured from the rotor to the driving scroll. However, in the conventional twin-rotating scroll compressor, since the driving scroll is embedded in the rotor, the amount of compression must be set large to ensure the predetermined torque transmission force.

[0013] When an attempt is made to ensure torque transmission force by the amount of press-fitting between the rotor and the driving scroll, there is a possibility that the driving scroll may be deformed.

[0014] The present invention has been made in view of the above-mentioned conventional situation, and aims to provide a twin-rotating scroll compressor capable of ensuring torque transmission force from a rotor to a driving scroll while suppressing deformation of the driving scroll.

[0015] Means for solving problems

[0016] The twin-rotating scroll compressor of the present invention comprises a housing, a driving mechanism, a driving scroll, a driven scroll, and a driven mechanism.

[0017] The driving scroll is driven to rotate around the driving axis by the driving mechanism.

[0018] The driven scroll is eccentric with respect to the driving scroll and is driven to rotate about a driven axis by the driving scroll and the driven mechanism.

[0019] The driving scroll comprises: a driving end plate extending in a direction intersecting the driving axis; a driving peripheral wall protruding in a cylindrical shape from the driving end plate toward the driven scroll; and a driving scroll body protruding in a spiral shape from the driving end plate toward the driven scroll within the driving peripheral wall.

[0020] The driven scroll includes: a driven end plate extending in a direction intersecting the driven axis; and a driven scroll body protruding in a spiral shape from the driven end plate toward the driving scroll.

[0021] 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 due to the rotational driving and the rotational following.

[0022] The twin-rotary scroll compressor is characterized in that:

[0023] The driving mechanism includes a rotor having a cylindrical shape and surrounding the driving scroll from the outer peripheral side and arranged on the outer peripheral surface of the driving scroll.

[0024] The inner diameter of the rotor is larger than the outer diameter of the outer peripheral surface of the driving scroll at a portion where the rotor is disposed.

[0025] The driving scroll has, on its outer peripheral surface in the circumferential direction of the driving scroll, a first region including a connection portion where an outer peripheral end portion of the driving scroll body is connected to the driving peripheral wall and a portion of the driving peripheral wall; and a second region including the driving peripheral wall other than the driving peripheral wall in the first region.

[0026] The driving circumferential wall in the first region is a thicker portion whose first inner surface facing inward in the radial direction of the driving scroll is located closer to the radial inner side than the second inner surface facing inward in the radial direction of the driving circumferential wall in the second region.

[0027] A torque transmission mechanism for transmitting torque from the rotor to the driving scroll is provided in the first region of the driving scroll and in a portion of the rotor corresponding to the first region.

[0028] In the twin orbiting scroll compressor of the present invention, the torque transmission force from the rotor to the driving scroll can be ensured by the torque transmission mechanism provided in the first region of the driving scroll and the rotor.

[0029] Furthermore, the driving peripheral wall of the driving scroll in the first region, where the torque transmission mechanism is provided, is thicker than the driving peripheral wall in the second region, and has a high strength corresponding to the wall thickness. Therefore, deformation of the driving peripheral wall caused by the formation of the torque transmission mechanism can be suppressed, thereby suppressing deformation of the driving scroll.

[0030] Furthermore, since the inner diameter of the rotor is larger than the outer diameter of the outer peripheral surface of the driving scroll on which the rotor is arranged, the driving scroll is not deformed by the amount of press-fitting.

[0031] Therefore, according to the twin-rotating scroll compressor of the present invention, it is possible to ensure torque transmission force from the rotor to the driving scroll while suppressing deformation of the driving scroll.

[0032] Preferably, the first inner surface of the driving peripheral wall in the first region is formed along an involute curve obtained by extending the involute curve described by the inner side surface of the driving scroll body as it is.

[0033] In this case, the driving scroll body is connected to the driving peripheral wall so that the inner side surface of the driving scroll body and the inner surface of the driving peripheral wall are continuous, thereby making the driving peripheral wall thick in the first region. Therefore, there is no need to provide a separate thick wall portion.

[0034] Preferably, the torque transmission mechanism comprises a recessed portion and a convex portion engaging with the recessed portion. The recessed portion may be formed on the radially outward outer surface of the driving scroll in the first region. The convex portion may be formed on the inner surface of the rotor that is radially opposed to the outer surface.

[0035] In this case, the torque transmission force from the rotor to the driving scroll can be well ensured by the concave-convex engagement. In addition, the concave portion is formed in the thick wall portion having higher strength than other parts, so the influence of the strength reduction caused by the formation of the concave portion can be suppressed.

[0036] The rotor may include a plurality of permanent magnets arranged at intervals in the circumferential direction. Furthermore, the torque transmission mechanism is preferably arranged to face one of the plurality of permanent magnets in the radial direction.

[0037] In this case, it is possible to suppress disturbance of magnetic lines of force due to the torque transmission mechanism.

[0038] Preferably, a base circle of the involute curve described by the driving scroll body is offset toward the torque transmission mechanism with respect to the center of the rotor in the radial direction.

[0039] In this case, the driving scroll can be surrounded from the outer peripheral side by the rotor while suppressing an increase in the inner diameter of the rotor.

[0040] Effects of the Invention

[0041] According to the twin-rotating scroll compressor of the present invention, it is possible to ensure torque transmission force from the rotor to the driving scroll while suppressing deformation of the driving scroll. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a cross-sectional view of a twin-rotating scroll compressor according to an embodiment.

[0043] Figure 2 The twin-rotary scroll compressor of the embodiment is Figure 1 Cross-sectional view along line AA.

[0044] Figure 3 The present invention relates to a twin-rotating scroll compressor of an embodiment and is a schematic cross-sectional view showing a case where the base circle of a driving scroll is offset from the center of a rotor.

[0045] Figure 4 For comparison, this is a schematic cross-sectional view showing the rotor and the driving scroll in which the center of the rotor coincides with the center of the base circle of the driving scroll. DETAILED DESCRIPTION

[0046] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0047] like Figure 1 As shown, a twin-rotating scroll compressor (hereinafter referred to as a compressor) according to Embodiment 1 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 a "drive mechanism" according to the present invention. This compressor is mounted on a vehicle (not shown) and constitutes a vehicle air conditioning system.

[0048] In this embodiment, using Figure 1The solid arrows shown define the front-rear direction of the compressor. Note that the front-rear direction is an example for convenience of explanation, and the compressor can change its posture appropriately depending on the vehicle on which it is installed.

[0049] The housing 60 consists of a housing body 61 and a cover 65. The housing 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, centered on the drive axis R1, and has an inner peripheral surface 62B. The drive axis R1 is parallel to the front-to-back direction. In the following description, the front direction refers to one direction of the drive axis R1, and the rear direction refers to the other direction of the drive axis R1.

[0050] The bottom wall 63 is located at the rear end of the housing body 61. It extends orthogonally to the drive axis R1 and has a generally circular, flat plate-like shape. The outer peripheral edge of the bottom wall 63 is connected to the rear end of the outer peripheral wall 62. A cylindrical second shaft support 64 protrudes from the center of the inner surface of the bottom wall 63, projecting forward with the driven axis R2 as its center. The driven axis R2 is eccentric relative to the drive axis R1 while extending parallel to it. The inner ring of the bearing 71 is fitted onto the exterior of the second shaft support 64.

[0051] It should be noted that an inverter housing provided with a connector portion is coupled to the rear of the housing body 61. An inverter circuit having a circuit substrate and switching elements, etc., is housed in the inverter housing. The inverter circuit is electrically connected to the battery of the vehicle via a connector, and is electrically connected to the stator 17 described later via an airtight passage provided in the bottom wall 63. Thus, the inverter circuit converts the DC current supplied from the battery into AC current while supplying power to the stator 17. It should be noted that the illustration of the airtight passage, the connector portion, the inverter housing, the inverter circuit, and the battery is omitted.

[0052] The cover 65 is positioned in front of the housing body 61. The cover 65 extends perpendicular to the drive axis R1 and has a generally circular, flat plate shape. The cover 65 is secured to the outer peripheral wall 62 of the housing body 61 by bolts (not shown), with its outer peripheral edge abutting the front end. This seals the housing body 61 from the front. This creates a suction chamber 61A within the housing body 61.

[0053] A cylindrical first shaft support portion 66 centered on the drive axis R1 is provided protrudingly at the center of the inner surface of the cover 65. An outer ring of a needle roller bearing 72 is fitted into the first shaft support portion 66.

[0054] The cover 65 is formed with an intake communication port 65A and an exhaust communication port 65B. The intake communication port 65A is located between the outer peripheral edge of the cover 65 and the first shaft support portion 66 and penetrates the cover 65 in a direction parallel to the drive axis R1. The intake communication port 65A connects the suction chamber 61A with the outside of the compressor. A pipe is connected to the intake communication port 65A. As a result, the low-temperature and low-pressure refrigerant gas that has passed through the evaporator is sucked into the suction chamber 61A through the pipe.

[0055] The discharge communication port 65B is located at the center of the cover 65 and extends through the cover 65 in a direction parallel to the drive axis R1, opening into the first shaft support portion 66. 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 38B, described later, to flow toward the condenser. It should be noted that the piping, evaporator, and condenser are not shown in the figure.

[0056] The electric motor 10 is housed in the suction chamber 61A. Thus, the suction chamber 61A also serves as a motor chamber for housing the electric motor 10. The electric motor 10 is composed of a stator 17 and a rotor 11.

[0057] The stator 17 is cylindrical centered on the drive axis R1 and includes a winding 18. The stator 17 is fixed to the housing body 61 and further to the housing 60 by fitting into the inner peripheral surface 62B of the outer peripheral wall 62 of the housing body 61.

[0058] The rotor 11 is cylindrical around the drive axis R1 and is disposed within the stator 17. The center O of the rotor 11 coincides with the drive axis R1. The rotor 11 has a front surface 111 and a rear surface 112 located opposite the front surface 111. Although not shown in detail, the rotor 11 is composed of a plurality of permanent magnets 12 corresponding to the stator 17 and laminated steel plates to which the permanent magnets 12 are fixed. Figure 2 As shown, the plurality of permanent magnets 12 are arranged at equal intervals along the circumferential direction of the driven scroll 30 .

[0059] The driving scroll 30 includes a driving end plate 31, a driving peripheral wall 32, and a driving scroll body 33. The driving end plate 31, the driving peripheral wall 32, and the driving scroll body 33 are integrally formed. The driving scroll 30 is made of a non-magnetic material. Specifically, the driving scroll 30 is made of an aluminum alloy.

[0060] The driving end plate 31 extends in a substantially circular plate shape perpendicular to the driving axis R1 and has a front surface 311 and a rear surface 312 located opposite to the front surface 311 .

[0061] A discharge valve chamber 34 is formed on the front surface 311 of the driving end plate 31. The discharge valve chamber 34 is formed by a recessed portion of the front surface 311 that is partially recessed toward the compression chamber 55 described later. The discharge valve chamber 34 has an inner surface shape that roughly corresponds to the outer shape of the discharge valve mechanism 56 so as to be able to accommodate the discharge valve mechanism 56 described later. In addition, a discharge port 35 is formed near the center of the driving end plate 31, penetrating the driving end plate 31 in the front-to-back direction. The discharge port 35 connects the compression chamber 55 with the discharge valve chamber 34.

[0062] A discharge valve mechanism 56 is disposed within the discharge valve chamber 34. The discharge valve mechanism 56 includes a discharge reed valve 57, a retainer 58, and a fixing bolt 59. The discharge reed valve 57 and retainer 58 are fixed to the bottom surface of the discharge valve chamber 34 by the fixing bolt 59. The discharge reed valve 57 can open and close the discharge port 35. Furthermore, the retainer 58 can adjust the opening of the discharge reed valve 57.

[0063] The driving scroll 33 is located inside the driving peripheral wall 32. The driving scroll 33 extends from the rear surface 312 of the driving end plate 31 toward the rear and parallel to the driving axis R1. The driving scroll 33 is formed based on an involute curve and spirals around the driving axis R1. Figure 2 As shown in FIG. 1 , when viewed from the rear, the driving scroll body 33 is formed to be counterclockwise wound around the driving axis R1 from the vortex center. The end portion of the outer peripheral side of the driving scroll body 33 is connected to the driving peripheral wall 32. It should be noted that, in Figure 2 In the figure, the discharge port 35 which should be visible from the rear is omitted.

[0064] The driving peripheral wall 32 extends from the outer peripheral edge of the driving end plate 31 toward the rear, that is, toward the driven scroll 40, in parallel with the driving axis R1. The driving peripheral wall 32 has a substantially cylindrical shape centered on the driving axis R1.

[0065] A bearing cover 36 is fixed to the front surface 311 of the driving end plate 31 in front of the driven scroll 30 . The bearing cover 36 is made of a magnetic material. Specifically, the bearing cover 36 is made of an iron-based alloy having a higher strength than the driven scroll 30 .

[0066] The bearing cover 36 includes a cover portion 37 and a first boss 38 formed integrally with the cover portion 37 .

[0067] The cover portion 37 extends in a substantially disk-like shape perpendicular to the drive axis R1 . A through hole 37B is formed in the center of the cover portion 37 .

[0068] The first boss 38 protrudes forward from the inner periphery of the cover portion 37, that is, from the center of the cover portion 37. The first boss 38 extends cylindrically in the direction of the drive axis R1, centered about the drive axis R1. The cylindrical interior space of the first boss 38 constitutes the discharge portion 38B. It should be noted that in this compressor, the discharge valve chamber 34 and the discharge portion 38B constitute the discharge chamber.

[0069] The cover portion 37 of the bearing cover 36 and the driving end plate 31 of the driving scroll 30 are fastened together by a plurality of bolts 50 extending parallel to the drive axis R1. In the fastened state by the bolts 50, the front surface 311 of the driving end plate 31 is in surface contact with the rear surface 371 of the cover portion 37, which is opposed to the front surface 311 in the front-to-back direction.

[0070] The driven scroll 40 includes a driven end plate 41 and a driven scroll body 42. The driven end plate 41 and the driven scroll body 42 are formed integrally. The driven scroll 40 is made of a non-magnetic material. Specifically, the driven scroll 40 is made of an aluminum alloy.

[0071] The driven end plate 41 extends orthogonally to the driven axis R2 and has a generally circular plate shape. The driven end plate 41 has a front surface 411 and a rear surface 412 located opposite the front surface 411. A second boss 43 is formed in the center of the rear surface 412, projecting toward the bottom wall 63. The second boss 43 has a cylindrical shape centered on the driven axis R2.

[0072] The driven end plate 41 is provided with a suction port 44. The suction port 44 penetrates the driven end plate 41 in the driven axis R2 direction, ie, in the front-rear direction, at a position closer to the outer periphery than the second boss 43.

[0073] The driven scroll body 42 extends forward from the front surface 411 of the driven end plate 41 in parallel with the driven axis R2. The driven scroll body 42 is formed based on an involute curve and spirals around the driven axis R2. More specifically, Figure 2 As shown, the driven scroll 42 is formed to spiral counterclockwise around the driven axis R2 from the scroll center. The driving scroll 30 and the driven scroll 40 form a compression chamber 55 by the driving scroll 33 and the driven scroll 42 facing each other.

[0074] 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 there are three or more of each. Figure 1 In the figure, two of each of the rotation preventing pins 21 and the rings 22 are shown.

[0075] Each of the rotation preventing pins 21 is fixed to the rear surface of a peripheral wall shoulder portion 81 (described later) of the driving scroll 30. Each of the rings 22 is fixed to the front surface 411 of the driven end plate 41 so as to face the respective rotation preventing pins 21.

[0076] In the compressor of Example 1, a rotor housing portion 80 is provided on the outer circumferential surfaces of the drive end plate 31 and the drive peripheral wall 32. The rotor housing portion 80 is provided so as to extend rearward from the front surface 311 of the drive end plate 31 and reach the drive peripheral wall 32. The outer circumferential surface of the rotor housing portion 80 has a cylindrical shape corresponding to the inner circumferential surface of the rotor 11. The rotor 11 is disposed on the outer circumferential surface of the rotor housing portion 80. The outer diameter of the rotor housing portion 80 is slightly smaller than the inner diameter of the rotor 11. In other words, the rotor 11 and the rotor housing portion 80 are fitted with a clearance fit.

[0077] In addition, an annular peripheral wall shoulder 81 is provided on the outer peripheral surface of the rear end portion of the driving peripheral wall 32. The peripheral wall shoulder 81 is provided behind the rotor housing portion 80 and is continuous with the rotor housing portion 80. The outer diameter of the peripheral wall shoulder 81 is larger than the outer diameter of the rotor housing portion 80. Specifically, the outer diameter of the peripheral wall shoulder 81 is larger than the outer diameter of the rotor housing portion 80 by an amount corresponding to the radial thickness of the rotor 11. The front surface of the peripheral wall shoulder 81, that is, the shoulder end surface 811 of the peripheral wall shoulder 81 facing forward, abuts against the rear surface 112 of the rotor 11. In this way, the rotor 11 surrounds the driving scroll 30 from the outer peripheral side while being arranged on the outer peripheral surface of the driving scroll 30.

[0078] like Figure 2 As shown, the driving scroll 30 has a first region S and a second region outside the first region S on its outer peripheral surface in the circumferential direction of the driving scroll 30. The first region S includes the connection portion 82 where the outer peripheral end of the driving scroll 33 is connected to the driving peripheral wall 32. The first region S also includes a portion of the driving peripheral wall 32. The second region includes the driving peripheral wall 32 outside the first region S.

[0079] The driving peripheral wall 32 in the first region S forms a thick portion 85 in which a first inner surface 83 facing radially inward of the driving scroll 30 is located radially inward of a second inner surface 84 facing radially inward of the driving peripheral wall 32 in the second region.

[0080] Furthermore, the first inner surface 83 of the driving peripheral wall 32 in the first region S is formed along an involute curve obtained by extending the involute curve described by the inner side surface 331 of the driving scroll 33 as is. In other words, the involute curve obtained by extending the involute curve described by the inner side surface 331 of the driving scroll 33 as is coincides with the involute curve described by the first inner surface 83 of the driving peripheral wall 32 in the first region S. This involute curve extends throughout the entire first region S, but the winding end of the involute curve does not extend into the second region.

[0081] A recessed portion 87 is formed on the radially outward outer surface 86 of the driving scroll 30 in the first region S. A protrusion 114 is formed on the inner surface 113 of the rotor 11 that radially opposes the outer surface 86 of the driving scroll 30, and engages with the recessed portion 87. The recessed portion 87 and the protrusion 114 are examples of the "torque transmission mechanism" of the present invention. Specifically, a torque transmission mechanism for transmitting torque from the rotor 11 to the driving scroll 30 is provided in the first region S of the driving scroll 30 and in the portion of the rotor 11 corresponding to the first region S.

[0082] The recessed portion 87 and the convex portion 114 extend in the front-to-back direction with a substantially rectangular cross-sectional shape. They extend from the front surface 311 of the drive end plate 31 to the shoulder end surface 811 of the peripheral wall shoulder 81. Furthermore, the recessed portion 87 and the convex portion 114 are disposed so as to face one of the permanent magnets 12 in the radial direction of the driven scroll 30. Specifically, the recessed portion 87 and the convex portion 114 are disposed so as to avoid gaps between adjacent permanent magnets 12.

[0083] And, as Figure 3 As shown, the base circle C of the involute curve described by the driving scroll 33 is offset in the radial direction of the driving scroll 30 toward the concave portion 87 and the convex portion 114 relative to the center O of the rotor 11. Although not shown in the figure, it should be noted that the base circle of the involute curve described by the driven scroll 42 is also offset in the radial direction of the driving scroll 30 toward the concave portion 87 and the convex portion 114 relative to the center O of the rotor 11.

[0084] An end ring 51 is positioned in front of the rotor 11 in the rotor housing 80. The end ring 51 is made of a non-magnetic material. Specifically, it is made of an aluminum alloy. The end ring 51 is sandwiched between the bearing cover 36 and the rotor 11, and is held between the rear surface 371 of the cover 37 and the front surface 111 of the rotor 11.

[0085] In the compressor constructed as described above, the electric motor 10 is operated by controlling the operation of the electric motor 10 while power is supplied to the stator 17 by an inverter circuit (not shown). This causes the rotor 11 to rotate, thereby rotating the driving scroll 30 about the drive axis R1 within the suction chamber 61A. Specifically, the driving scroll 30, which is integrally incorporated with the rotor 11, is rotated. 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, causing each ring 22 to rotate relative to the center of the respective anti-rotation pin 21. In this way, the driven mechanism 20 transmits the torque of the driving scroll 30 to the driven scroll 40.

[0086] As a result, the driven scroll 40 is driven in rotation about 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. Thus, the driven scroll 40 orbits relative to the driving scroll 30 about the drive axis R1, driven by the rotation of the driving scroll 30 and the driven scroll 40, thereby changing the volume of the compression chamber 55.

[0087] Therefore, the refrigerant in the suction chamber 61A is drawn into the compression chamber 55 through the suction port 44 and compressed by the compression chamber 55. The refrigerant, compressed to the discharge pressure by the compression chamber 55, is then discharged from the discharge port 35 into the discharge valve chamber 34, and then through the discharge portion 38B and the discharge communication port 65B to the condenser. In this manner, air conditioning is performed by the vehicle air conditioning system.

[0088] Here, in this compressor, a recessed portion 87 is formed on the outer surface 86 of the driven scroll 30, and a protrusion 114 is formed on the inner surface 113 of the rotor 11 that is radially opposed to the outer surface 86, and engages with the recessed portion 87. Therefore, the concave-convex engagement between the recessed portion 87 and the protrusion 114 ensures good torque transmission from the rotor 11 to the driven scroll 30.

[0089] Furthermore, the recess 87 is formed in the thick portion 85 which is thicker and stronger than other portions of the driving peripheral wall 32. Therefore, deformation of the driving peripheral wall 32 due to the formation of the recess 87 can be effectively suppressed.

[0090] Furthermore, since torque transmission from the rotor 11 to the driven scroll 30 is not ensured by press-fitting the rotor 11 and the driven scroll 30, deformation of the driven scroll 30 due to the amount of press-fitting is also avoided. The recess 87 is provided in the thick wall portion 85 of the driving peripheral wall 32, minimizing the impact of the recess 87 on the strength of the driving peripheral wall 32. Consequently, deformation of the driving scroll 30 can be effectively suppressed.

[0091] Therefore, according to this compressor, it is possible to ensure the torque transmission force from the rotor 11 to the driving scroll 30 while suppressing deformation of the driving scroll 30 .

[0092] In this compressor, recess 87 is formed in thick portion 85 of connection portion 82 formed at the outer peripheral end of driving scroll 33 and connected to driving peripheral wall 32. Therefore, there is no need to provide a separate thick portion for forming recess 87.

[0093] Furthermore, the recessed portions 87 and the convex portions 114 are arranged so as to avoid gaps between adjacent permanent magnets 12. Therefore, disturbance of magnetic field lines due to the formation of the recessed portions 87 and the convex portions 114 can be suppressed.

[0094] In addition, the base circle C of the involute curve described by the driving scroll 33 is offset in the radial direction of the driving scroll 30 relative to the center O of the rotor 11 toward the concave portion 87 and the convex portion 114. Therefore, the driving scroll 30 can be surrounded from the outer circumference by the rotor 11 while suppressing the increase in the inner diameter of the rotor 11. As a result, Figure 3 As shown, it is possible to suppress the outer diameter D1 of the rotor 11 from increasing, and thus suppress the compressor from increasing in the radial direction.

[0095] For comparison, Figure 4 9 shows a rotor 91 and a driving scroll 92, in which the center of the base circle C of the involute curve described by the driving scroll 90 coincides with the center O of the rotor 91. In this case, the outer diameter D2 of the rotor 91 is larger than the outer diameter D1 of the rotor 11 of the compressor of the embodiment, and the connection portion 94 connecting the driving scroll 90 and the driving peripheral wall 93 is too thick compared to the connection portion 82 of the compressor of the embodiment.

[0096] Furthermore, in this compressor, the rotor 11, which is disposed on the outer peripheral surface of the driven scroll 30, is restricted from moving forward by the cover portion 37 of the bearing cover 36, and its movement backward is restricted by the shoulder end surface 811 of the peripheral wall shoulder 81. Therefore, the bearing cover 36 and the peripheral wall shoulder 81 prevent the rotor 11 from separating from the driven scroll 30 in the front-rear direction.

[0097] In this case, since bolt holes or the like are not formed in the rotor 11 for preventing the rotor 11 from coming off, the strength of the rotor 11 is not reduced, and consequently, the durability of the rotor 11 is not reduced.

[0098] Furthermore, the first boss 38 rotatably supported by the housing 60 via the needle bearing 72 is integrally provided with the bearing cover 36 , and the bearing cover 36 is stronger than the driving end plate 31 . Therefore, the first boss 38 can bear the bearing load from the needle bearing 72 .

[0099] Furthermore, in this compressor, a non-magnetic end ring 51 is interposed between the rotor 11 and the bearing cover 36. Therefore, magnetic flux leakage can be suppressed by the end ring 51. Consequently, the bearing cover 36 can be made of a cost-effective iron-based alloy.

[0100] Furthermore, in this compressor, the front surface 311 of the drive end plate 31 is in surface contact with the rear surface 371 of the cover portion 37, which is opposed to the front surface 311 in the front-to-back direction. Therefore, it is easy to secure the bearing cover 36 to the drive end plate 31 in an appropriate posture, and this helps ensure the coaxiality between the drive axis R1 and the first boss 38.

[0101] As mentioned above, although the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments and can be applied with appropriate modifications within the scope not departing from the gist of the present invention.

[0102] For example, in the compressor of the embodiment, the torque transmission mechanism is formed by engaging a concave and convex portion, but the present invention is not limited to this. For example, a pin may be fixed to the rotor instead of a convex portion, and the torque transmission mechanism may be formed by engaging the pin with a concave portion provided in the driving scroll.

[0103] In the compressor of the embodiment, the first region S can be Figure 2 The first region S of the drive scroll 33 extends clockwise by an amount corresponding to the region Q to the winding end of the vortex (at Figure 2 In the compressor of the embodiment, when the first region S is extended in this manner, the space that becomes the suction space (the space of the region Q) can be eliminated and the space can be made into a thick-walled portion.

[0104] In the compressor of the embodiment, a gasket may be interposed between the front surface 311 of the driving end plate 31 and the rear surface 371 of the cover portion 37 .

[0105] In the compressor of the embodiment, the rotor 11 is prevented from coming off relative to the driving scroll 30 by the bearing cover 36 and the peripheral wall shoulder 81, but the present invention is not limited thereto. For example, shrink fit or bolts may be used for prevention.

[0106] In the compressor of the embodiment, the driven mechanism 20 is composed of the rotation preventing pin 21 and the ring 22. However, the invention is not limited thereto, and the driven mechanism 20 may also be composed of a pin-ring-pin system in which two pins are in sliding contact with the inner circumference of a free ring, a pin-pin system in which the outer circumferences of two pins are in sliding contact with each other, or a system using an Oldham coupling.

[0107] (Note 1)

[0108] A twin-rotating scroll compressor includes a housing, a driving mechanism, a driving scroll, a driven scroll, and a driven mechanism.

[0109] The driving scroll is driven to rotate around the driving axis by the driving mechanism.

[0110] The driven scroll is eccentric with respect to the driving scroll and is driven to rotate about a driven axis by the driving scroll and the driven mechanism.

[0111] The driving scroll comprises: a driving end plate extending in a direction intersecting the driving axis; a driving peripheral wall protruding in a cylindrical shape from the driving end plate toward the driven scroll; and a driving scroll body protruding in a spiral shape from the driving end plate toward the driven scroll within the driving peripheral wall.

[0112] The driven scroll includes: a driven end plate extending in a direction intersecting the driven axis; and a driven scroll body protruding in a spiral shape from the driven end plate toward the driving scroll.

[0113] 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 due to the rotational driving and the rotational following.

[0114] The twin-rotary scroll compressor is characterized in that:

[0115] The driving mechanism includes a rotor having a cylindrical shape and surrounding the driving scroll from the outer peripheral side and arranged on the outer peripheral surface of the driving scroll.

[0116] The inner diameter of the rotor is larger than the outer diameter of the outer peripheral surface of the driving scroll at a portion where the rotor is disposed.

[0117] The driving scroll has, on its outer peripheral surface in the circumferential direction of the driving scroll, a first region including a connection portion where an outer peripheral end portion of the driving scroll body is connected to the driving peripheral wall and a portion of the driving peripheral wall; and a second region including the driving peripheral wall other than the driving peripheral wall in the first region.

[0118] The driving circumferential wall in the first region is a thicker portion whose first inner surface facing inward in the radial direction of the driving scroll is located closer to the radial inner side than the second inner surface facing inward in the radial direction of the driving circumferential wall in the second region.

[0119] A torque transmission mechanism for transmitting torque from the rotor to the driving scroll is provided in the first region of the driving scroll and in a portion of the rotor corresponding to the first region.

[0120] (Note 2)

[0121] The twin-rotating scroll compressor according to Supplementary Note 1, wherein:

[0122] The first inner surface of the driving peripheral wall in the first region is formed along the involute curve obtained by directly extending the involute curve described by the inner side surface of the driving scroll body.

[0123] (Note 3)

[0124] The twin-rotating scroll compressor according to Supplementary Note 1 or 2, wherein:

[0125] The torque transmission mechanism includes a recessed portion formed on the radially outer outer surface of the driving scroll in the first region, and a protruding portion formed on the inner surface of the rotor facing the outer surface in the radial direction and engaging with the recessed portion.

[0126] (Note 4)

[0127] The twin-rotary scroll compressor according to any one of Supplementary Notes 1 to 3, wherein:

[0128] The rotor includes a plurality of permanent magnets arranged at intervals in the circumferential direction.

[0129] The torque transmission mechanism is arranged to face one of the plurality of permanent magnets in the radial direction.

[0130] (Note 5)

[0131] The twin-rotary scroll compressor according to any one of Supplementary Notes 1 to 4, wherein:

[0132] The base circle of the involute curve described by the driving scroll body is offset in the radial direction relative to the center of the rotor toward the torque transmission mechanism.

[0133] The present invention can be utilized in a vehicle air conditioner or the like.

[0134] Description of Reference Numerals

[0135] 10 Electric motor (drive mechanism)

[0136] 11 rotor

[0137] 12 Permanent magnets

[0138] 113 opposing inner surfaces

[0139] 114 convex portion (torque transmission mechanism)

[0140] 20 Follower mechanism

[0141] 30 Drive scroll

[0142] 31 Drive end plate

[0143] 32 Drive wall

[0144] 33 driving scroll

[0145] 331 inner side

[0146] 82 connection

[0147] 83 First inner surface

[0148] 84 Second inner surface

[0149] 85 thick wall part

[0150] 86 outer surface

[0151] 87 Recess (torque transmission mechanism)

[0152] 40 driven scroll

[0153] 41 Driven end plate

[0154] 42 driven scroll

[0155] 55 Compression Chamber

[0156] 60 shell

[0157] R1 drive shaft

[0158] R2 driven axis

[0159] S First Area

[0160] C base circle.

Claims

1. A twin-rotating scroll compressor comprising a housing, a drive mechanism, a driving scroll, a driven scroll, and a driven mechanism. The driving scroll is driven to rotate around the driving axis by the driving mechanism. The driven scroll is eccentric with respect to the driving scroll and is driven to rotate about a driven axis by the driving scroll and the driven mechanism. The driving scroll comprises: a driving end plate extending in a direction intersecting the driving axis; a driving peripheral wall protruding in a cylindrical shape from the driving end plate toward the driven scroll; and a driving scroll body protruding in a spiral shape from the driving end plate toward the driven scroll within the driving peripheral wall. The driven scroll includes: a driven end plate extending in a direction intersecting the driven axis; and a driven scroll body protruding in a spiral shape from the driven end plate toward the driving scroll. 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 due to the rotational driving and the rotational following. The twin-rotary scroll compressor is characterized in that: The driving mechanism includes a rotor having a cylindrical shape and surrounding the driving scroll from the outer peripheral side and arranged on the outer peripheral surface of the driving scroll. The inner diameter of the rotor is larger than the outer diameter of the outer peripheral surface of the driving scroll at a portion where the rotor is disposed. The driving scroll has, on its outer peripheral surface in the circumferential direction of the driving scroll, a first region including a connection portion where an outer peripheral end portion of the driving scroll body is connected to the driving peripheral wall and a portion of the driving peripheral wall; and a second region including the driving peripheral wall other than the driving peripheral wall in the first region. The driving circumferential wall in the first region is a thicker portion whose first inner surface facing inward in the radial direction of the driving scroll is located closer to the radial inner side than the second inner surface facing inward in the radial direction of the driving circumferential wall in the second region. A torque transmission mechanism for transmitting torque from the rotor to the driving scroll is provided in the first region of the driving scroll and in a portion of the rotor corresponding to the first region.

2. The twin-rotary scroll compressor according to claim 1, wherein: The first inner surface of the driving peripheral wall in the first region is formed along the involute curve obtained by directly extending the involute curve described by the inner side surface of the driving scroll body.

3. The twin-rotary scroll compressor according to claim 1, wherein: The torque transmission mechanism includes a recessed portion formed on the radially outer outer surface of the driving scroll in the first region, and a protruding portion formed on the inner surface of the rotor facing the outer surface in the radial direction and engaging with the recessed portion.

4. The twin-rotary scroll compressor according to any one of claims 1 to 3, wherein: The rotor includes a plurality of permanent magnets arranged at intervals in the circumferential direction. The torque transmission mechanism is arranged to face one of the plurality of permanent magnets in the radial direction.

5. The twin-rotary scroll compressor according to any one of claims 1 to 3, wherein: A base circle of the involute curve described by the driving scroll body is offset toward the torque transmission mechanism relative to the center of the rotor in the radial direction.

Images