Double rotary scroll compressor

Abstract

The compressor has a housing (6), a driving mechanism (10), a driving scroll (30), a driven scroll (40), a driven mechanism (20), and a discharge chamber (14). The driving scroll (30) and the driven scroll (40) form a compression chamber (12). Fluid compressed in the compression chamber (12) is discharged to the discharge chamber (14). A protruding body (64) is provided to the housing (6). The protruding body (64) has a first diameter portion (64a) and a second diameter portion (64b) having a larger diameter than the first diameter portion (64a). The driving scroll (30) has a cover (37) rotatably supported to the first diameter portion (64a) via a bearing (51). Inside the second diameter portion (64b), a first fluid passage (3) through which a specific fluid having a lower temperature and a lower pressure than the fluid in the discharge chamber (14) flows is formed.

Description

Technical Field

[0001] This invention relates to a dual rotary scroll compressor. Background Technology

[0002] Patent Document 1 discloses a conventional dual-rotary scroll compressor (hereinafter referred to as the compressor). This compressor includes a housing, a drive mechanism, a drive scroll member, a driven scroll member, a driven mechanism, and a discharge area. The housing has a scroll member chamber that houses the drive mechanism, the drive scroll member, and the driven scroll member. Fluid is drawn into the scroll member chamber from outside the housing. In this document, the fluid is specifically a refrigerant.

[0003] The drive mechanism has a stator and a rotor. The stator is fixed to the housing. The drive scroll member has a cover. This cover has a cylindrical extension. The rotor is fixed to the outer circumferential surface of the extension. Thus, the drive scroll member can be driven to rotate about the drive shaft by the rotation of the rotor. The driven scroll member is eccentric relative to the drive scroll member and can be driven to rotate about the driven shaft by the drive scroll member and the driven mechanism. These drive scroll members and driven scroll members form a compression chamber that compresses the fluid by the drive rotation and the driven rotation. The discharge area is specifically a discharge port. The discharge area is formed in the driven scroll member and communicates with the compression chamber.

[0004] Furthermore, in this compressor, a protrusion is provided in the outer casing. The protrusion is formed into a generally cylindrical shape with a fixed outer diameter and protrudes into the scroll chamber towards both the driving and driven scroll members in the direction of the drive shaft. The protrusion extends into the interior of the extension. A bearing is provided between the inner circumferential surface of the extension and the outer circumferential surface of the protrusion. In this way, the protrusion supports the casing via the bearing, allowing it to rotate. Additionally, a fluid passage extending in the direction of the drive shaft is formed inside the protrusion. One side of the fluid passage communicates with the discharge area in the direction of the drive shaft, and the other side communicates with the outside of the outer casing.

[0005] In this compressor, the fluid compressed in the compression chamber is discharged to the discharge area. Furthermore, the fluid discharged to the discharge area is discharged to the outside of the casing, i.e., the outside of the compressor, by flowing through the fluid passage.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2-227575 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] However, in the aforementioned conventional compressors, the outer diameter of the protrusion is not large enough, and a fluid passage is formed inside the protrusion. Therefore, it is difficult to ensure the rigidity of the protrusion, which may lead to a decrease in the durability of the protrusion and, consequently, the compressor.

[0011] Therefore, increasing the outer diameter of the protrusion could be considered to ensure its rigidity. However, since the protrusion extends into and supports the cover, a larger outer diameter would necessitate a corresponding increase in the size of the bearings and the cover itself. Consequently, this would inevitably lead to a larger compressor.

[0012] Furthermore, in this compressor, the fluid compressed in the compression chamber flows through the fluid passage. Here, the fluid compressed in the compression chamber is at high temperature and high pressure; therefore, the temperature of the protrusion and bearing rises due to the fluid flowing through the fluid passage. Consequently, the durability of the bearing is prone to decrease; therefore, from this perspective, the overall durability of this compressor may also decrease.

[0013] The present invention was made in view of the above-mentioned prior conditions, and the problem to be solved is to provide a dual rotary scroll compressor with excellent durability and the ability to suppress large size.

[0014] Methods for solving problems

[0015] The dual-rotary scroll compressor of the present invention includes a housing, a drive mechanism, a drive scroll member, a driven scroll member, a driven mechanism, and a discharge area.

[0016] The housing has a scroll chamber that houses the driving scroll member and the driven scroll member.

[0017] The driving scroll component is driven to rotate around the driving shaft via the driving mechanism.

[0018] The driven scroll member is eccentric relative to the driving scroll member and can be driven to rotate around the driven axis by the driving scroll member and the driven mechanism.

[0019] The driving scroll member and the driven scroll member form a compression chamber that compresses the fluid through the driving rotation and the driven rotation.

[0020] The fluid compressed in the compression chamber is discharged into the discharge area.

[0021] The dual rotary scroll compressor is characterized in that...

[0022] The housing is provided with a protrusion that protrudes into the chamber of the scroll member in the direction of the drive shaft, facing both the driving scroll member and the driven scroll member.

[0023] The protrusion has a first diameter portion and a second diameter portion with a diameter larger than the first diameter portion.

[0024] The driving scroll member or the driven scroll member has a cover that is rotatably supported on the first radial portion via bearings.

[0025] A fluid passage is formed inside the second diameter, which communicates with the outside of the second diameter and is capable of supplying a specific fluid that is colder and lower in pressure than the fluid in the discharge area.

[0026] In the dual-rotary scroll compressor of the present invention, the protrusion has a first diameter and a second diameter, the first diameter supporting the housing via a bearing. On the other hand, the diameter of the second diameter is larger than the diameter of the first diameter. Furthermore, a fluid passage is formed inside the second diameter. Therefore, compared to the case where the protrusion is formed only with the first diameter and a fluid passage is formed inside the first diameter, in this compressor, the rigidity of the protrusion is easily ensured by the second diameter.

[0027] Furthermore, since the housing is rotatably supported on the first diameter section via bearings, it is difficult to increase the size of the bearings and housing even if the diameter of the second diameter section is larger than that of the first diameter section. Moreover, since the diameter of the second diameter section is larger than that of the first diameter section, the size of the fluid passage can be included within the interior, increasing the design freedom of the fluid passage.

[0028] Furthermore, a specific fluid with a lower temperature and lower pressure flows through this fluid passage than the fluid in the discharge area. Therefore, in this compressor, the protrusion, including the second diameter portion, is less likely to be heated by the specific fluid within the fluid passage. Consequently, in this compressor, the temperature rise of the bearing due to the temperature rise of the protrusion can also be suppressed.

[0029] Therefore, the dual-rotary scroll compressor of the present invention has excellent durability and can suppress large-scale development.

[0030] In the compressor of the present invention, the outer casing and the protrusion may be formed separately. Furthermore, it is preferable that the second diameter portion is fixed to the outer casing.

[0031] In this case, the outer casing and the protrusion can be formed from different materials, thus easily ensuring the rigidity and durability of the protrusion. Furthermore, compared to forming the outer casing and the protrusion integrally, this compressor not only facilitates the formation of fluid passages but also increases the design freedom of the protrusion.

[0032] In the compressor of the present invention, the specific fluid may be lubricating oil contained in the fluid. The fluid passage may allow lubricating oil to flow and store. A first passage and a second passage may be formed in the protrusion, the first passage being connected to the fluid passage and allowing lubricating oil to flow into the fluid passage, and the second passage being connected to the fluid passage at a different location from the first passage and allowing lubricating oil within the fluid passage to flow towards the outside of the fluid passage. Preferably, a return passage and a supply passage are formed in the housing, the return passage communicating with the discharge area and the first passage and allowing lubricating oil to flow from the discharge area towards the first passage, and the supply passage communicating with the second passage and the compression chamber and allowing lubricating oil to flow from the second passage towards the compression chamber.

[0033] In this configuration, lubricating oil in the discharge area flows into the fluid passage through the return passage formed in the housing and the first passage formed in the protrusion, and is stored within the fluid passage. Thus, in this compressor, the fluid passage can be used as a reservoir for lubricating oil. Furthermore, the lubricating oil in the fluid passage is supplied to the compression chamber through the first passage formed in the protrusion and the supply passage formed in the housing. In this way, in addition to lubricating the compression chamber, the driving scroll member, driven scroll member, etc., can be appropriately lubricated in this compressor, thereby further improving its durability.

[0034] Furthermore, by using the fluid passage as an oil reservoir for lubricating oil, there is no need to provide a dedicated space for the oil reservoir in the compressor itself. In this respect, it is also possible to prevent the compressor from becoming too large.

[0035] Alternatively, in this case, the driving scroll member may have a cover. The driven scroll member may have a receiving recess facing the first diameter in the direction of the driving shaft. A bushing may be housed in the receiving recess. A shaft may be provided in the bushing and a bushing passage may be formed, the shaft extending in the direction of the driving shaft and inserted into the first diameter, the bushing passage allowing lubricating oil from the return flow path to the first passage to flow into the receiving recess. Furthermore, preferably, a shaft hole is formed inside the shaft, extending in the direction of the driving shaft and communicating with the receiving recess and the fluid passage, allowing lubricating oil to flow from the receiving recess towards the fluid passage.

[0036] Therefore, the bushing can be properly lubricated by lubricating oil, thus improving the bushing's durability.

[0037] Additionally, in the compressor of the present invention, a suction port may be formed in the housing, which allows fluid to be drawn from the outside of the housing into the scroll chamber. The specific fluid may be lubricating oil contained within the fluid. A connecting passage may be formed in the second diameter portion, which connects to the fluid passage and communicates with a position in the scroll chamber located below the second diameter portion in the direction of gravity, allowing lubricating oil in the scroll chamber to flow toward the fluid passage. Furthermore, it is also preferable that a suction passage is formed in the housing, which communicates with both the fluid passage and the compression chamber, allowing lubricating oil flowing through the fluid passage to flow toward the compression chamber.

[0038] Since lubricating oil is a liquid, it tends to accumulate in the scroll chamber towards the lower side in the direction of gravity. To address this, a connecting passage is formed in the second diameter section of this compressor, which communicates with a position in the scroll chamber that is further down in the direction of gravity than the second diameter section. Therefore, the lubricating oil in the scroll chamber can be appropriately circulated into the fluid passage via the connecting passage. Furthermore, in this compressor, the lubricating oil that has flowed through the fluid passage can circulate towards the compression chamber via the suction passage formed in the casing. Therefore, even in this compressor, the lubricating oil can be appropriately used to lubricate not only the compression chamber but also the driving scroll and driven scroll components.

[0039] Alternatively, in this case, the cover may have an extension that is cylindrical, extending in the direction of the drive shaft, and covers the second diameter portion from the outside. Alternatively, a gap may be provided between the extension and the second diameter portion, which communicates with the scroll chamber and allows fluid flow within the scroll chamber. Furthermore, it is preferable that the suction passage allows the fluid flowing through the gap to flow towards the compression chamber along with the lubricating oil.

[0040] Therefore, without forming a dedicated passage for drawing fluid from the vortex chamber into the compression chamber, the fluid that flows through the gap between the extension and the second diameter section, i.e. the fluid inside the vortex chamber, can be appropriately drawn into the compression chamber through the suction passage.

[0041] Additionally, in the compressor of the present invention, a connecting passage may be formed in the housing, which connects the fluid passage to the outside of the housing. The specific fluid may be a suction refrigerant drawn into the fluid passage through the connecting passage. The fluid passage may be capable of separating the suction refrigerant into a gaseous refrigerant phase and a liquid refrigerant phase, and storing the liquid refrigerant. The connecting passage may be located above the fluid passage in the direction of gravity at an opening in the housing. A first refrigerant passage may be formed in the second diameter portion, which allows the gaseous refrigerant in the fluid passage to flow into the scroll chamber. Furthermore, it is also preferable that a second refrigerant passage is formed in the housing, which communicates with the scroll chamber and the compression chamber and allows the gaseous refrigerant in the scroll chamber to flow towards the compression chamber.

[0042] In this case, the fluid passage can be used as a gas-liquid separation chamber for drawing in refrigerant. Furthermore, by storing liquid refrigerant in the fluid passage, it is suitable to prevent liquid refrigerant from being drawn into the compression chamber. Additionally, by using the fluid passage as a gas-liquid separation chamber for drawing in refrigerant, it is unnecessary to provide a dedicated space for the gas-liquid separation chamber in the compressor itself. Therefore, it is possible to suppress the increase in compressor size. Moreover, in this compressor, the connection passage is located above the fluid passage in the direction of gravity at the opening in the casing, thus it is suitable to prevent backflow of liquid refrigerant stored in the fluid passage in the connection passage.

[0043] In the compressor of the present invention, the drive scroll member may have a cover. Alternatively, the cover may have an extension that is cylindrical in shape extending in the direction of the drive shaft and covering the second diameter portion from the outside. Furthermore, it is preferable that the drive mechanism has a stator fixed to the housing and disposed within the scroll member chamber, and a rotor fixed to the extension and disposed within the stator.

[0044] In this case, by configuring the drive mechanism within the scroll chamber, there is no need to provide a dedicated space for the drive mechanism within the scroll chamber, separate from the outer casing. Furthermore, by fixing the rotor to the extension of the casing, the casing and rotor can be easily secured. Therefore, in this compressor, the rotation of the rotor can appropriately drive the scroll component to rotate.

[0045] Furthermore, in the compressor of the present invention, the drive scroll member may have a cover. Also preferably, the drive mechanism has a stator fixed to the second diameter portion and disposed within the scroll member chamber, and a rotor that covers the stator from the outside within the scroll member chamber and is fixed to the cover.

[0046] Even in this case, there is no need to provide a dedicated space for the drive mechanism in the casing or the scroll chamber. Furthermore, since the diameter of the second diameter is larger than that of the first diameter, the stator can be properly fixed to the second diameter.

[0047] Invention Effects

[0048] The dual-rotary scroll compressor of the present invention has excellent durability and can prevent its size from increasing. Attached Figure Description

[0049] Figure 1 This is a cross-sectional view of the compressor in Example 1.

[0050] Figure 2 This is a cross-sectional view of the compressor in Example 2.

[0051] Figure 3 This is a cross-sectional view of the compressor in Example 3.

[0052] Figure 4 This is a cross-sectional view of the compressor in Example 4. Detailed Implementation

[0053] Hereinafter, embodiments 1 to 4, which embody the present invention, will be described with reference to the accompanying drawings. The dual rotary scroll compressors of embodiments 1 to 4 are mounted on vehicles (not shown) and constitute the vehicle's air conditioning system.

[0054] Example 1

[0055] like Figure 1 As shown, the compressor of Embodiment 1 includes a housing 6, an electric motor 10, a drive scroll member 30, a driven scroll member 40, a driven mechanism 20, and a discharge chamber 14. The electric motor 10 is an example of the "drive mechanism" in this invention. Furthermore, the discharge chamber 14 is an example of the "discharge area" in this invention.

[0056] In this embodiment, by Figure 1 The solid arrows shown indicate the compressor's forward / backward and up / down directions. Furthermore, in Figure 2 Later, with Figure 1 Correspondingly, the compressor's front-to-back and vertical directions are defined. These directions are orthogonal to each other. Furthermore, the direction from top to bottom aligns with the direction of gravity in this invention. Therefore, in this compressor, when mounted in a vehicle, from... Figure 1 The upper part of the paper, etc., acts downwards due to gravity. Furthermore, these forward and backward directions are just one example for ease of explanation; the compressor can appropriately change its posture depending on the vehicle it is mounted on.

[0057] like Figure 1As shown, the outer casing 6 consists of an outer casing body 60 and an outer casing cover 62. The outer casing body 60 and the outer casing cover 62 are made of aluminum alloy.

[0058] The outer casing 60 is a bottomed cylindrical component with an outer peripheral wall 60a and a rear wall 60b. The outer peripheral wall 60a is cylindrical with the drive shaft O1 as its center. The drive shaft O1 is parallel to the front-to-back direction.

[0059] A suction port 68 is formed on the outer peripheral wall 60a. The suction port 68 extends radially in the outer casing body 60. The suction port 68 is connected to the evaporator (not shown) via piping (not shown).

[0060] The rear wall 60b is located at the rear end of the housing body 60. The rear wall 60b extends in a generally circular flat plate shape orthogonal to the drive shaft O1. The outer periphery of the rear wall 60b is connected to the rear end of the outer peripheral wall 60a. In addition, a mounting recess 60c is formed in the rear wall 60b. The mounting recess 60c is recessed from the front to the rear relative to the inner surface of the rear wall 60b.

[0061] Inside the outer casing 60, a protrusion 64 is provided. The protrusion 64 is made of steel. The protrusion 64 has a first diameter portion 64a and a second diameter portion 64b. These first diameter portions 64a and second diameter portions 64b are integrally formed. Alternatively, the protrusion 64 may be made of aluminum alloy.

[0062] The first diameter portion 64a constitutes the front portion of the protrusion 64. The first diameter portion 64a is formed into a generally cylindrical shape extending in the direction of the drive shaft. The diameter of the first diameter portion 64a is smaller than that of the insertion hole 37d described later. A pin hole 4 and a first passage 5 are formed in the first diameter portion 64a. The pin hole 4 and the first passage 5 are disposed separately and pass through the first diameter portion 64a in the direction of the drive shaft O1. Thus, the pin hole 4 and the first passage 5 open at the front end face of the first diameter portion 64a. In addition, the pin hole 4 is formed into a diameter larger than that of the first passage 5. Alternatively, the pin hole 4 and the first passage 5 may be formed into the same diameter, or the first passage 5 may be formed into a diameter larger than that of the pin hole 4.

[0063] Additionally, a first sliding bearing 51 is provided on the outer peripheral surface of the first diameter portion 64a. The first sliding bearing 51 is an example of a "bearing" in this invention. Alternatively, a ball bearing may be provided on the outer peripheral surface of the first diameter portion 64a instead of the first sliding bearing 51.

[0064] The second diameter portion 64b is located behind the first diameter portion 64a, forming the rear portion of the protrusion 64. Furthermore, the second diameter portion 64b is formed with a diameter larger than that of the first diameter portion 64a. The second diameter portion 64b is composed of a main body portion 641 and a flange portion 642. The main body portion 641 forms the front portion of the second diameter portion 64b, and the flange portion 642 forms the rear portion of the second diameter portion 64b.

[0065] The main body portion 641 is coaxial with the first radial portion 64a and extends in the direction of the drive shaft center O1. The main body portion 641 is connected to the first radial portion 64a. The flange portion 642 is formed with a diameter larger than that of the main body portion 641 and extends outward in the radial direction of the second radial portion 64b than that of the main body portion 641.

[0066] A first fluid passage 3, a second fluid passage 7, a second passage 8, and a connecting passage 9 are formed in the second diameter portion 64b. The first fluid passage 3 and the second fluid passage 7 are examples of "fluid passages" in this invention.

[0067] The first fluid passage 3, with a diameter larger than that of the pin hole 4 and the first passage 5, extends along the drive shaft O1 direction inside the main body portion 641 and the flange portion 642, and opens at the rear end face of the flange portion 642. Here, the first fluid passage 3 is recessed forward from the rear end of the flange portion 642, i.e., the rear end of the second diameter portion 64b, and does not penetrate the second diameter portion 64b. The first fluid passage 3 communicates with both the pin hole 4 and the first passage 5.

[0068] The second fluid passage 7, with a smaller diameter than the first fluid passage 3, extends along the drive shaft O1 direction within the main body portion 641 and the flange portion 642, and opens at the front end face of the main body portion 641. Here, the second fluid passage 7 is positioned radially outward of the second diameter portion 64b compared to the first fluid passage 3, and is not in communication with the first fluid passage 3. Furthermore, the second fluid passage 7 is recessed rearward from the front end of the second diameter portion 64b and does not penetrate the flange portion 642. That is, the first fluid passage 3 and the second fluid passage 7 are recessed relative to the second diameter portion 64b in opposite directions along the drive shaft O1 direction.

[0069] The second passage 8 is formed in the main body portion 641 and is positioned radially inside the second fluid passage 7 in the second diameter portion 64b. The second passage 8 penetrates the main body portion 641 in the direction of the drive shaft center O1. Thus, the front end of the second passage 8 opens at the front end face of the main body portion 641 and the rear end communicates with the first fluid passage 3.

[0070] A connecting passage 9 is formed in the flange portion 642. The connecting passage 9 extends radially along the second radial portion 64b inside the flange portion 642. Thus, one end of the connecting passage 9 is connected to the rear portion of the second fluid passage 7, and the other end opens on the outer peripheral surface of the flange portion 642. Alternatively, the connecting passage 9 may be formed in the main body portion 641.

[0071] By engaging the flange portion 642 with the mounting recess 60c, the protrusion 64 is secured to the rear wall 60b. In this way, the rear end of the first fluid passage 3 is closed by the rear wall 60b within the protrusion 64.

[0072] The housing cover 62 is disposed in front of the housing body 60. The housing cover 62 is generally disc-shaped with the drive shaft O1 as the center. The housing cover 62 has a front surface 62a facing forward and a rear surface 62b located on the opposite side of the front surface 62a and facing rearward.

[0073] Additionally, a support portion 66 and a discharge port 69 are formed on the outer casing 62. The support portion 66 is integrally formed approximately at the center of the rear surface 62b and protrudes rearward from the rear surface 62b. The support portion 66 is formed into a cylindrical shape centered on the drive shaft O1, and a ball bearing 52 and a shaft seal member 63 are disposed inside it. The shaft seal member 63 is disposed inside the support portion 66 at a position forward of the ball bearing 52. The shaft seal member 63 is formed into an annular shape. Alternatively, a sliding bearing may be disposed inside the support portion 66 instead of the ball bearing 52.

[0074] The discharge port 69 extends through the housing 62 in the direction of the drive shaft O1 and communicates with the interior of the support 66. Furthermore, the discharge port 69 is connected to the condenser (not shown) via piping (not shown).

[0075] In the housing 6, the rear surface 62b of the housing cover 62 abuts against the front end of the outer peripheral wall 60a of the housing body 60. Furthermore, in this state, the housing cover 62 is fixed to the housing body 60 from the housing cover 62 side using multiple bolts (not shown). Thus, in the housing 6, the housing body 60 and the housing cover 62 are integrated.

[0076] Furthermore, in the housing 6, a vortex chamber 65 is formed within the housing body 60 by sealing the front of the housing body 60 with the housing cover 62. The vortex chamber 65 communicates with the intake port 68. Thus, refrigerant is drawn into the vortex chamber 65 from the outside of the housing 6 through the intake port 68. The refrigerant is an example of a "fluid" in this invention. The refrigerant includes lubricating oil 18.

[0077] Furthermore, the aforementioned protrusion 64 is fixed to the rear wall 60b, thereby protruding from the rear wall 60b into the scroll chamber 65 in the direction of the drive shaft O1. More specifically, the protrusion 64 protrudes forward from the rear wall 60b toward the driving scroll 30 and the driven scroll 40. Moreover, the second diameter portion 64b divides the scroll chamber 65 and the first fluid passage 3 within the protrusion 64.

[0078] Furthermore, in the protrusion 64, the other end of the connecting passage 9 communicates with the vortex chamber 65. At this time, in the connecting passage 9, the other end faces downwards towards the vortex chamber 65. Thus, the other end of the connecting passage 9 communicates with a position in the vortex chamber 65 that is lower in the direction of gravity than the second diameter portion 64b.

[0079] The electric motor 10 is housed within the scroll chamber 65. Thus, the scroll chamber 65 also serves as the motor chamber for housing the electric motor 10.

[0080] The electric motor 10 consists of a stator 17 and a rotor 11. The stator 17 is cylindrical with a drive shaft O1 as its center and has windings 17a. The stator 17 is fixed to the housing body 60 and then to the housing 6 by being embedded in the inner circumferential surface of the outer peripheral wall 60a.

[0081] The rotor 11 is cylindrical around the drive shaft O1 and is disposed inside the stator 17. Although detailed illustrations are omitted, the rotor 11 consists of a plurality of permanent magnets corresponding to the stator 17 and stacked steel plates that fix each permanent magnet.

[0082] The driving scroll component 30 is made of metal such as aluminum alloy. The driving scroll component 30 is housed within the scroll component chamber 65. The driving scroll component 30 has a driving end plate 31, a driving scroll body 33, a driving peripheral wall 35, a cover 37, and a housing 39.

[0083] The drive end plate 31 extends in a generally disk-shaped manner orthogonal to the drive shaft O1 and the driven shaft O2. The driven shaft O2 is eccentric relative to the drive shaft O1 and extends parallel to the drive shaft O1. That is, the driven shaft O2 is also parallel to the front-rear direction. The drive end plate 31 has a first front surface 311 facing forward and a first rear surface 312 located on the opposite side of the first front surface 311 and facing rearward.

[0084] Furthermore, a discharge port 32 is formed on the drive end plate 31. The discharge port 32 extends through the drive end plate 31 in the direction of the drive shaft O1. Moreover, a discharge reed valve 57 and a retainer 58 are fixed to the first front surface 311 of the drive end plate 31 by fixing bolts 59. Thus, the discharge reed valve 57 can open and close the discharge port 32. And the retainer 58 can adjust the opening degree of the discharge reed valve 57.

[0085] The driving scroll body 33 is integral with the driving end plate 31 and protrudes rearward from the first rear surface 312, that is, parallel to the driven scroll member 40, the driving shaft O1, and the driven shaft O2. Although detailed illustrations are omitted, the driving scroll body 33 protrudes in a scroll shape with the center side of the driving end plate 31 as the scroll center and from the scroll center outward.

[0086] The drive peripheral wall 35 is formed as a cylinder extending parallel to both the drive shaft O1 and the driven shaft O2, with the drive shaft O1 as the center. The front end of the drive peripheral wall 35 is integral with the outer periphery of the drive end plate 31. Thus, the drive peripheral wall 35 surrounds the drive vortex body 33 from the outside and protrudes rearward from the first rear surface 312 in a cylindrical shape. Furthermore, although not shown in the figure, the outer peripheral end of the vortex in the drive vortex body 33 is connected to the inner peripheral surface of the drive peripheral wall 35.

[0087] Furthermore, a first oil passage 35a is formed in the drive end plate 31 and the drive peripheral wall 35. The first oil passage 35a extends through the drive end plate 31 and the drive peripheral wall 35 in the direction of the drive shaft center O1. Thus, the front end of the first oil passage 35a opens on the first front surface 311 of the drive end plate 31. And the rear end of the first oil passage 35a opens on the rear end surface of the drive peripheral wall 35.

[0088] The cover 37 is composed of a main cover portion 37a and an extension portion 37b. The main cover portion 37a extends in a generally disk-shaped manner orthogonal to the drive shaft O1 and the driven shaft O2. Figure 1 As shown, the main body 37a of the cover is formed with a diameter that is approximately the same as that of the drive end plate 31 and the drive peripheral wall 35. The main body 37a of the cover has a second front surface 371 facing forward and a second rear surface 372 located on the opposite side of the second front surface 371 and facing rearward.

[0089] The main body 37a has a recess 37c, an insertion hole 37d, a suction passage 37e, a return passage 37f, and a first bolt hole 37g. The suction passage 37e is an example of a "supply passage" in this invention.

[0090] The recess 37c is located approximately at the center of the second front surface 371 and is recessed rearward from the second front surface 371. The through hole 37d penetrates the main body 37a in the direction of the drive shaft O1. The through hole 37d is formed as a cylinder centered on the drive shaft O1 and communicates with the recess 37c at its front end. The through hole 37d has a diameter approximately the same as the outer diameter of the first sliding bearing 51.

[0091] The suction passage 37e is positioned radially outward of the recess 37c relative to the outer side of the cover body 37. The suction passage 37e extends through the cover body 37a in the front-rear direction, with its front end opening on the second front surface 371 and its rear end opening on the second rear surface 372. Here, the suction passage 37e is inclined radially inward toward the cover body 37 as it moves from front to rear. Furthermore, the rear end of the suction passage 37e opens on the second rear surface 372 at a position radially inward of the cover body 37 relative to the extension 37b.

[0092] One end of the return passage 37f opens on the second front surface 371 at a position different from that of the intake passage 37e. Furthermore, the return passage 37f extends inside the cover body 37a and opens into the recess 37c at the other end. Thus, the return passage 37f is not connected to the intake passage 37e, but is connected to the recess 37c. The first bolt hole 37g is located radially outward of the cover body 37 compared to the intake passage 37e. The first bolt hole 37g penetrates the cover body 37a in the direction of the drive shaft O1. Moreover, multiple first bolt holes 37g are formed in the cover body 37a.

[0093] Furthermore, in the main body 37a, a plurality of rings 22 are installed between the recess 37c and the suction passage 37e. Although detailed illustrations are omitted, each ring 22 is arranged at equal intervals around the recess 37c in a forward-facing position and surrounds the recess 37c from the outside. In this embodiment, the number of rings 22 is set to six. Figures 1-4 In the figure, one of each ring 22 and the first bolt hole 37g mentioned above are shown.

[0094] like Figure 1 As shown, the extension 37b is integrally formed on the main body 37a and extends rearward in a cylindrical shape from the second rear surface 372 in the direction of the drive shaft O1. The inner diameter of the extension 37b is larger than the diameter of the second diameter portion 64b of the protrusion 64, or more specifically, the diameter of the main body portion 641 of the second diameter portion 64b. On the other hand, the outer diameter of the extension 37b is smaller than the diameter of the rotor 11.

[0095] The cover 37 abuts against the rear end face of the drive peripheral wall 35 with its second front surface 371. Furthermore, in this state, the first bolts 34a are inserted into each of the first bolt holes 37g and screwed (threaded) into the drive peripheral wall 35. Thus, the cover 37 is fixed to the drive peripheral wall 35 in the drive scroll member 30. As a result, one end of the return flow path 37f matches the rear end of the first oil passage 35a, and the return flow path 37f communicates with the first oil passage 35a.

[0096] The housing 39 is a bottomed cylindrical member having an outer peripheral wall 39a and a front wall 39b. The outer peripheral wall 39a is cylindrical with the drive shaft O1 as its center. Here, the outer diameter of the outer peripheral wall 39a is formed to be approximately the same as the diameter of the drive end plate 31.

[0097] A second oil passage 39c is formed in the outer peripheral wall 39a. One end of the second oil passage 39c opens on the inner peripheral surface of the outer peripheral wall 39a. Furthermore, the second oil passage 39c extends inside the outer peripheral wall 39a and opens at the rear end surface of the outer peripheral wall 39a.

[0098] The front wall 39b is located at the front end of the housing 39. The front wall 39b extends in a generally disk-shaped manner orthogonal to the drive shaft O1 and the driven shaft O2. The outer periphery of the front wall 39b is connected to the front end of the outer peripheral wall 39a. Furthermore, a boss 39d is formed on the front wall 39b. The boss 39d is integrally formed at the center of the front wall 39b and protrudes forward from the front wall 39b in the direction of the drive shaft O1. The boss 39d is formed with a diameter approximately the same as the inner diameter of the ball bearing 52 and the inner diameter of the shaft seal member 63. Additionally, a discharge passage 390 is formed on the boss 39d. The discharge passage 390 extends through the boss 39d in the direction of the drive shaft O1.

[0099] Furthermore, a second bolt hole 39e is formed on the outer peripheral wall 39a and the front wall 39b. The second bolt hole 39e penetrates the outer peripheral wall 39a and the front wall 39b in the direction of the drive shaft center O1. Here, the second bolt hole 39e is not connected to the second oil passage 39c. Moreover, multiple second bolt holes 39e are formed on the outer peripheral wall 39a and the front wall 39b. Furthermore, in... Figures 1-4 The diagram shows one of the multiple second bolt holes 39e.

[0100] like Figure 1 As shown, the housing 39 abuts against the first front surface 311 of the drive end plate 31 with the rear end face of the outer peripheral wall 39a. Furthermore, in this state, the second bolts 34b are inserted into each of the second bolt holes 39e and screwed onto the drive end plate 31. Thus, in the drive scroll member 30, the housing 39 is fixed to the drive end plate 31.

[0101] Thus, by fixing the housing 39 to the drive end plate 31, a discharge chamber 14 is formed on the inner side of the outer peripheral wall 39a and between the front wall 39b of the housing 39 and the drive end plate 31. The discharge chamber 14 communicates with the discharge outlet 32 ​​and the discharge passage 390. Moreover, one end of the second oil passage 39c communicates with the discharge chamber 14.

[0102] Furthermore, by fixing the housing 39 to the drive end plate 31, the other end of the second oil passage 39c is matched with the front end of the first oil passage 35a. Thus, the second oil passage 39c is connected to the first oil passage 35a. As a result, in the drive scroll member 30, the return flow path 37f is connected to the discharge chamber 14 via the first oil passage 35a and the second oil passage 39c.

[0103] The driven scroll member 40 is also made of aluminum alloy. The driven scroll member 40 has a driven end plate 41 and a driven scroll body 43.

[0104] The driven end plate 41 extends in a generally disk-shaped manner orthogonal to the drive shaft O1 and the driven shaft O2. The driven end plate 41 has a third front surface 411 facing forward and a third rear surface 412 located on the opposite side of the third front surface 411 and facing rearward.

[0105] A receiving recess 15 is formed in the driven end plate 41. The receiving recess 15 is located in the center of the driven end plate 41. The receiving recess 15 is cylindrically recessed about the driven axis O2, facing forward from the third rear surface 412 of the driven end plate 41. Thus, the receiving recess 15 faces the rear of the driven end plate 41 and further faces the first diameter portion 64a of the protrusion 64.

[0106] A bushing 53 is housed within the receiving recess 15, separated by the second sliding bearing 13. A bushing passage 54 is formed in the bushing 53. The bushing passage 54 extends through the bushing 53 in the direction of the drive shaft O1 and communicates with the receiving recess 15.

[0107] Furthermore, a driven pin 55 is inserted into the bushing 53 at a different position than the bushing passage 54. More specifically, the driven pin 55 is inserted into the bushing 53 at a position off-center from the center of the bushing 53, i.e., off-center from the driven shaft center O2. The driven pin 55 is an example of a "shaft" in this invention. The driven pin 55 protrudes rearward from the bushing 53 and then from the driven end plate 41. In addition, a shaft hole 55a is formed in the driven pin 55. The shaft hole 55a passes through the driven pin 55 in the direction of the drive shaft center O1. Thus, the driven pin 55 communicates with the receiving recess 15 at its front end.

[0108] Additionally, a rotation-stopping pin 21 is fixed in the driven end plate 41 at a position opposite to the ring 22. The rotation-stopping pin 21 protrudes rearward from the third rear surface 412. Furthermore, six rotation-stopping pins 21 are fixed in the driven end plate 41 in the same number as the rings 22. Figures 1-4 The diagram shows one of the respective turning stop pins 21.

[0109] And, as Figure 1As shown, the driven mechanism 20 is formed by these rotation-stopping pins 21 and rings 22. Here, the number of rotation-stopping pins 21 and rings 22 can be appropriately designed as long as there are 3 or more of them.

[0110] The driven scroll body 43 is integral with the driven end plate 41 and extends forward parallel to the drive shaft O1 and the driven shaft O2 from the third front surface 411 of the driven end plate 41. The driven scroll body 43 extends in a scroll shape with the center side of the driven end plate 41 as the scroll center and from the scroll center toward the outer periphery.

[0111] In this compressor, with the driven scroll 40 housed within the driving scroll 30, the driving scroll 33 of the driving scroll 30 engages with the driven scroll 43 of the driven scroll 40. Thus, the driving scroll 33 and the driven scroll 43 face each other to form the compression chamber 12.

[0112] Furthermore, an intake section 30a is formed between the driving peripheral wall 35 and the driven scroll member 40. That is, the driving scroll body 33 and the driven scroll body 43 are located within the intake section 30a. The intake section 30a is separated from the scroll member chamber 65 by the driving end plate 31, the driving peripheral wall 35, and the cover 37, and is also separated from the discharge chamber 14 by the driving end plate 31. In addition, the intake section 30a communicates with the intake passage 37e.

[0113] Furthermore, by housing the driven scroll member 40 within the driving scroll member 30, the respective rotation stop pins 21 enter into each ring 22. In this way, the driving scroll member 30 and the driven scroll member 40 are assembled together in the front-rear direction, and the driving scroll member 30 and the driven scroll member 40 constitute the scroll member compression section 100. Moreover, strictly speaking, after the driving scroll body 33 and the driven scroll body 43 engage and their respective rotation stop pins 21 enter into each ring 22, the cover 37 is fixed to the driving peripheral wall 35 within the driving scroll member 30.

[0114] Furthermore, by assembling the driven scroll member 30 and the driven scroll member 40 together, the receiving recess 15 of the driven end plate 41 and the bushing 53 are positioned so that the recess 37c faces the cover 37. Thus, the bushing passage 54 communicates with the recess 37c.

[0115] The drive scroll member 30 is disposed within the scroll member chamber 65 at a position forward of the electric motor 10. Furthermore, a rotor 11 is fixed to the drive scroll member 30 relative to the extension 37b of the housing 37. More specifically, the extension 37b is inserted into the rotor 11, and the outer peripheral surface of the extension 37b is fixed to the rotor 11. In this way, the drive scroll member 30 is fixed to the rotor 11 via the extension 37b.

[0116] Furthermore, in the drive vortex member 30, the main body portions 641 of the first diameter portion 64a and the second diameter portion 64b of the protrusion 64 are inserted into the interior of the extension portion 37b. Here, the extension portion 37b is formed with a diameter larger than that of the main body portion 641, thus forming a gap S between the inner circumferential surface of the extension portion 37b and the main body portion 641. The gap S communicates with the vortex member chamber 65.

[0117] Furthermore, in the drive scroll member 30, the first sliding bearing 51 is inserted into the insertion hole 37d of the cover 37. Thus, the cover 37 is rotatably supported on the first radial portion 64a via the first sliding bearing 51. Furthermore, the pin hole 4 and the first passage 5 are respectively oriented towards the bushing 53 in the front-rear direction via the recess 37c. In this way, the pin hole 4 and the first passage 5 communicate with the recess 37c. Consequently, the first fluid passage 3 and the return passage 37f are connected via the recess 37c, the pin hole 4, and the first passage 5.

[0118] Furthermore, in the drive scroll member 30, the second passage 8 faces into the gap S. Thus, the first fluid passage 3 and the gap S are connected via the second passage 8. Additionally, in the drive scroll member 30, the second fluid passage 7 is connected to the gap S by having its front end face into the gap S.

[0119] Furthermore, in the drive scroll member 30, the boss 39d of the housing 39 is inserted into the ball bearing 52 and the shaft seal member 63. Thus, the housing 39 is rotatably supported on the support portion 66 via the ball bearing 52. In this way, the drive scroll member 30 is disposed within the scroll member chamber 65 and is supported on the outer casing 6 in a manner rotatable about the drive axis O1 by both the protrusion 64 and the support portion 66.

[0120] Furthermore, the discharge passage 390 is supported by the support portion 66 via the housing 39, thus positioning it so that it faces the discharge port 69 from the rear. Consequently, the discharge chamber 14 and the discharge port 69 are connected via the discharge passage 390. Moreover, the shaft seal member 63 seals the discharge passage 390 and the discharge port 69 between them and the scroll chamber 65.

[0121] On the other hand, in the driven scroll member 40, the driven pin 55 is inserted into the pin hole 4. Thus, the driven scroll member 40 is disposed within the scroll member chamber 65 and is supported rotatably about the driven axis O2 relative to the first diameter portion 64a of the protrusion 64. That is, unlike the driving scroll member 30, the driven scroll member 40 is supported on the housing 6 solely by the protrusion 64 in a manner that allows it to rotate about the driven axis O2.

[0122] In addition, by inserting the driven pin 55 into the pin hole 4, the first fluid passage 3 and the receiving recess 15 are connected through the shaft hole 55a and the pin hole 4.

[0123] In the compressor configured as described above, if using Figure 1 As shown by the dashed arrow, the low-temperature, low-pressure refrigerant after passing through the evaporator is drawn into the scroll chamber 65 through the suction port 68. Furthermore, if the electric motor 10 operates and the rotor 11 rotates, the rotation of the rotor 11 is transmitted to the drive scroll 30. Therefore, within the scroll chamber 65, the drive scroll 30 rotates around the drive shaft O1. That is, the drive scroll 30 rotates integrally with the rotor 11. At this time, in the driven mechanism 20, each rotation stop pin 21 slides into contact with the inner circumferential surface of each ring 22, causing each ring 22 to rotate relative to the center of its respective rotation stop pin 21. In this way, the driven mechanism 20 transmits the torque of the drive scroll 30 to the driven scroll 40.

[0124] As a result, the driven scroll member 40 is driven to rotate around the driven axis O2 by the driving scroll member 30 and the driven mechanism 20. At this time, the driven mechanism 20 restricts the rotation of the driven scroll member 40. Thus, the driven scroll member 40 revolves relative to the driving scroll member 30 around the driven axis O2. Furthermore, by driving the scroll body 33 and the driven scroll body 43 to rotate within the intake section 30a, the volume of the compression chamber 12 is changed.

[0125] Additionally, the refrigerant drawn into the scroll chamber 65 flows through the gap S into the suction passage 37e. Here, the refrigerant drawn into the scroll chamber 65 contains lubricating oil 18. Therefore, a portion of the lubricating oil 18 contained in the refrigerant is stored at the bottom of the scroll chamber 65 due to gravity. Thus, the electric motor 10 is lubricated by the lubricating oil 18.

[0126] Here, the protrusion 64 is fixed to the outer casing 60 and therefore does not rotate. Thus, by driving the vortex member 30 to rotate around the drive axis O1, the extension 37b rotates relative to the second diameter portion 64b of the protrusion 64 around the drive axis O1. As a result, the liquid refrigerant flowing through the gap S and towards the suction passage 37e is vaporized by shear force during its flow through the gap S. Therefore, the refrigerant reaching the suction passage 37e is essentially a gaseous refrigerant. In other words, the liquid refrigerant is difficult to reach the suction passage 37e and difficult to flow within it.

[0127] On the other hand, the refrigerant that has reached the suction passage 37e from the gap S is drawn into the compression chamber 12 through the suction section 30a. Furthermore, the compression chamber 12 compresses the refrigerant by reducing its volume while simultaneously enclosing it within itself through the driven rotation of the drive scroll member 30 and the driven rotation of the driven scroll member 40. In this way, the high-pressure refrigerant, compressed to the discharge pressure, is discharged from the discharge port 32 into the discharge chamber 14.

[0128] Here, the lubricating oil 18, which is not stored in the scroll chamber 65 but is drawn into the compression chamber 12 along with the refrigerant, is discharged from the outlet 32 ​​along with the high-pressure refrigerant into the discharge chamber 14. Furthermore, since the drive scroll 30 rotates around the drive shaft O1, the lubricating oil 18 discharged into the discharge chamber 14 is centrifugally separated from the refrigerant. At this time, the lubricating oil 18 in the discharge chamber 14 is dispersed towards the outer periphery, i.e., towards the outer peripheral wall 39a of the housing 39, within the discharge chamber 14 by centrifugal force.

[0129] In this way, the refrigerant discharged into the discharge chamber 14 flows through the discharge passage 390 and is discharged to the outside of the compressor through a piping connected to the discharge port 69. At this time, in the compressor, the discharge passage 390 and the scroll chamber 65 are sealed by the shaft seal member 63, thus preventing the refrigerant from the discharge passage 390 to the discharge port 69 from flowing into the scroll chamber 65.

[0130] On the other hand, the lubricating oil 18, which is discharged from the outlet 32 ​​along with the refrigerant into the discharge chamber 14, is stored in the discharge chamber 14. Furthermore, the lubricating oil 18 in the discharge chamber 14 is used... Figure 1 As shown by the solid arrow, the lubricating oil 18 flows from the second oil passage 39c toward the return passage 37f in the first oil passage 35a. Furthermore, the lubricating oil 18 flowing in the return passage 37f reaches the recess 37c. Thus, a portion of the lubricating oil 18 in the recess 37c, while lubricating the first diameter portion 64a of the first sliding bearing 51 and the protrusion 64, the cover body portion 37a and the driven end plate 41, the bushing 53 and the second sliding bearing 13, and the rotation stop pin 21 and the ring 22, flows in the first passage 5 and into the first fluid passage 3.

[0131] Additionally, the lubricating oil 18 in the recess 37c flows through the bushing passage 54, thereby reaching the space between the bushing 53 and the receiving recess 15. Thus, while lubricating the space between the second sliding bearing 13 and the bushing 53, the lubricating oil 18 also flows from the shaft hole 55a through the pin hole 4 into the first fluid passage 3.

[0132] In this way, the lubricating oil 18 that reaches the first fluid passage 3 through the pin hole 4 and the first passage 5 is stored in the first fluid passage 3. Thus, the first fluid passage 3 functions as a reservoir for the lubricating oil 18.

[0133] Here, the lubricating oil 18 in the first fluid passage 3 experiences a temperature decrease and pressure reduction as it flows from the discharge chamber 14 through the second oil passage 39c, the first oil passage 35a, the return passage 37f, and the recess 37c. Therefore, the lubricating oil 18 in the first fluid passage 3 is at a lower temperature and lower pressure than the lubricating oil 18 in the discharge chamber 14. Furthermore, the atmosphere in the first fluid passage 3 is also at a lower temperature and lower pressure than that in the discharge chamber 14.

[0134] However, the atmosphere inside the first fluid passage 3 becomes higher than that inside the vortex chamber 65. Therefore, if used Figure 1 As shown by the solid arrow, the lubricating oil 18 in the first fluid passage 3 flows through the second passage 8 and reaches the gap S, that is, the outside of the first fluid passage 3.

[0135] In addition, the lubricating oil 18 stored in the scroll chamber 65 is also used as described above. Figure 1 As shown by the solid arrow, fluid flows from the connecting passage 9 into the second fluid passage 7 and reaches the gap S. Here, the lubricating oil 18 in the scroll chamber 65 is also at a lower temperature and lower pressure than the lubricating oil 18 in the discharge chamber 14.

[0136] Thus, the lubricating oil 18 in the first fluid passage 3 and the lubricating oil 18 after flowing through the second fluid passage 7 reach the suction passage 37e together with the refrigerant flowing toward the suction passage 37e in the gap S, and are thus drawn into the compression chamber 12 together with the refrigerant. In this way, in the compressor, including the compression chamber 12, the driving scroll 30 and the driven scroll 40 are suitably lubricated by the lubricating oil 18.

[0137] Thus, in this compressor, the protrusion 64 has a first diameter portion 64a and a second diameter portion 64b, the diameter of which is larger than that of the first diameter portion 64a. Furthermore, a first fluid passage 3, a second fluid passage 7, and a connecting passage 9 are formed inside the second diameter portion 64b. Therefore, compared to the case where the protrusion 64 is formed only with the first diameter portion 64a and the first fluid passage 3, the second fluid passage 7, and the connecting passage 9 are formed inside the first diameter portion 64a, in this compressor, even with the first fluid passage 3, the second fluid passage 7, and the connecting passage 9 formed, the rigidity of the protrusion 64 is easily ensured by the second diameter portion 64b.

[0138] Furthermore, since the housing 37 is rotatably supported on the first diameter 64a via the first sliding bearing 51, the size of the first sliding bearing 51 is not affected by the size of the second diameter 64b, even if the diameter of the second diameter 64b is larger than that of the first diameter 64a. Additionally, the diameter of the extension 37b is smaller than that of the housing body 37a. Therefore, in this compressor, it is difficult to make the first sliding bearing 51 and the housing 37 large. Moreover, since the diameter of the second diameter 64b is larger than that of the first diameter 64a, the design freedom of the first fluid passage 3, the second fluid passage 7, and the connecting passage 9, including their sizes, is increased in this compressor. As a result, in this compressor, lubricating oil 18 can be adequately stored in the first fluid passage 3, and the lubricating oil 18 can flow appropriately in the second fluid passage 7 and the connecting passage 9.

[0139] Furthermore, lubricating oil 18, which is colder and lower pressure than the lubricating oil 18 in the discharge chamber 14, flows through these first fluid passages 3, second fluid passages 7, and connecting passages 9. Therefore, in this compressor, the lubricating oil 18 flowing through the first fluid passages 3, second fluid passages 7, and connecting passages 9 makes it difficult for the protrusion 64, including the second diameter portion 64b, to be heated. As a result, in this compressor, the temperature rise of the first sliding bearing 51 due to the temperature rise of the protrusion 64 is also suppressed.

[0140] Therefore, the compressor of Example 1 has excellent durability and can suppress large-scale development.

[0141] In particular, in this compressor, the lubricating oil 18 in the first fluid passage 3 can be drawn into the compression chamber 12 together with the refrigerant flowing in the suction passage 37e. Thus, the suction passage 37e not only draws the refrigerant into the compression chamber 12, but also functions as a supply passage for supplying the lubricating oil 18 to the compression chamber 12. Therefore, in this compressor, the compression chamber 12 can be properly lubricated by the lubricating oil 18 without forming a dedicated supply passage in the housing 37.

[0142] Furthermore, in this compressor, the lubricating oil 18 that reaches the recess 37c from the return flow path 37f can also appropriately lubricate the space between the first sliding bearing 51 and the first diameter portion 64a of the protrusion 64, as well as the space between the cover body portion 37a and the driven end plate 41. Additionally, in this compressor, the lubricating oil 18 that reaches the recess 37c from the return flow path 37f flows through the bushing passage 54 and reaches the space between the bushing 53 and the receiving recess 15, thereby also appropriately lubricating the space between the second sliding bearing 13 and the bushing 53. In this respect, the durability of the compressor is also improved.

[0143] Furthermore, in this compressor, the first fluid passage 3 functions as an oil reservoir for the lubricating oil 18, thus eliminating the need to form a dedicated oil reservoir within the housing 6. Moreover, in this compressor, the second fluid passage 7 and the connecting passage 9 are formed in the second diameter portion 64b, making it easy to form the second fluid passage 7 and the connecting passage 9.

[0144] Here, the second diameter portion 64b has a flange portion 642, which is formed to have a diameter larger than that of the main body portion 641. Furthermore, a connecting passage 9 is formed in the flange portion 642 and opens on its outer peripheral surface. Therefore, the connecting passage 9 communicates with the scroll chamber 65 near its lower portion, allowing the lubricating oil 18 in the scroll chamber 65 to flow easily and appropriately into the connecting passage 9. Thus, in this compressor, the lubricating oil 18 within the scroll chamber 65 can be appropriately drawn into the compression chamber 12.

[0145] Furthermore, in this compressor, the outer casing 60 and the protrusion 64 are formed separately. Therefore, by making the outer casing 60 of aluminum alloy and the protrusion 64 of steel, the rigidity and heat resistance of the protrusion 64 can be adequately ensured.

[0146] Furthermore, since the outer casing 60 and the protrusion 64 are separate parts, in this compressor, it is possible to facilitate the formation of the first fluid passage 3 on the second diameter portion 64b, and when the protrusion 64 is fixed to the outer casing 60, the rear end of the first fluid passage 3 can be appropriately closed by the rear wall 60b of the outer casing 60.

[0147] Example 2

[0148] like Figure 2 As shown, in the compressor of Embodiment 2, unlike the compressor of Embodiment 1, a protrusion 71 is provided on the outer casing body 60 instead of the protrusion 64. Furthermore, unlike the compressor of Embodiment 1, in this compressor, the drive scroll member 30 has a cover 75 instead of the cover 37.

[0149] The protrusion 71 is also made of steel and has a first diameter portion 71a and a second diameter portion 71b. The first diameter portion 71a has the same configuration as the first diameter portion 64a in the compressor of Embodiment 1. Therefore, a pin hole 4 and a first passage 5 are also formed in the first diameter portion 71a. In addition, a first sliding bearing 51 is provided on the outer peripheral surface of the first diameter portion 71a.

[0150] The second diameter portion 71b is composed of a main body portion 711 and a flange portion 712. These main body portions 711 and flange portions 712 are respectively formed to the same dimensions as the main body portion 711 and flange portion 712 in the compressor of Embodiment 1.

[0151] A fluid passage 72 and a second passage 73 are formed in the second diameter portion 71b. The fluid passage 72 has the same configuration as the first fluid passage 3 in the compressor of Embodiment 1, and is connected to the pin hole 4 and the first passage 5 respectively.

[0152] A second passage 73 is formed in the main body portion 711. At this time, the second passage 73 is formed on the rear side of the main body portion 711, near the flange portion 712. The second passage 73 penetrates the main body portion 711 radially through the second diameter portion 71b. Thus, the second passage 73 communicates with the fluid passage 72 and opens on the outer peripheral surface of the main body portion 711.

[0153] Similar to the protrusion 64 in the compressor of Embodiment 1, the protrusion 71 is fixed to the rear wall 60b by engaging the flange portion 712 with the mounting recess 60c. Thus, the rear end of the fluid passage 72 is closed by the rear wall 60b.

[0154] The cover 75, like the cover 37 in the compressor of Embodiment 1, is fixed to the drive peripheral wall 35 by the first bolt 34a. The cover 75 is composed of a cover body portion 75a and an extension portion 75b. In the cover body portion 75a, like the cover body portion 37a in the compressor of Embodiment 1, a recess 37c, a through hole 37d, a return flow path 37f, and a first bolt hole 37g are formed. The extension portion 75b has the same configuration as the extension portion 37b in the compressor of Embodiment 1 and is integrally formed on the cover body portion 75a.

[0155] Furthermore, in the cover 75, a suction passage 75c is formed in the cover body portion 75a. The suction passage 75c is also an example of a "supply passage" in this invention. The suction passage 75c extends through the cover body portion 75a in the direction of the drive axis O1. Thus, the front end of the suction passage 75c opens at the second front surface 751 of the cover body portion 75a and communicates with the suction portion 30a. On the other hand, the rear end of the suction passage 75c opens at the second rear surface 752 of the cover body portion 75a. At this time, the rear end of the suction passage 75c opens at the second rear surface 752 at a position radially outward of the cover 75 compared to the extension portion 75b. In this way, the suction passage 75c communicates with the vortex chamber 65 at its rear end.

[0156] In this compressor, a rotor 11 is fixed to the outer peripheral surface of the extension 75b. Furthermore, the main body portions 711 of the first diameter portion 71a and the second diameter portion 71b of the protrusion 71 are inserted into the interior of the extension 75b. Thus, similar to the compressor of Embodiment 1, a gap S is formed between the inner peripheral surface of the extension 75b and the main body portion 711.

[0157] Furthermore, in this compressor, the first sliding bearing 51 is also inserted into the insertion hole 37d. Thus, the cover 75 is rotatably supported on the first diameter portion 71a via the first sliding bearing 51. Moreover, the fluid passage 72 communicates with the recess 37c via the pin hole 4 and the first passage 5, and further, the fluid passage 72 communicates with the return passage 37f.

[0158] Furthermore, in this compressor, with the housing 75 rotatably supported on the first diameter portion 71a, the second passage 73 is located rearward of the extension 75b. Thus, the second passage 73 faces and communicates with the scroll chamber 65 from the rearward position of the clearance S. Consequently, the second passage 73 communicates with the suction passage 75c via the scroll chamber 65. The other components of this compressor are the same as those in Embodiment 1; the same reference numerals are used for the same components, and detailed descriptions related to the components are omitted.

[0159] In this compressor, similarly to the compressor of Example 1, the lubricating oil 18 discharged into the discharge chamber 14 flows in the return flow path 37f, etc. (see reference). Figure 2 (Solid arrow). Thus, in this compressor, the lubricating oil 18 discharged into the discharge chamber 14 flows into the fluid passage 72 and is stored therein. In this way, the fluid passage 72 also functions as a reservoir for the lubricating oil 18 in the compressor. In addition, the lubricating oil 18 in the fluid passage 72 flows out into the scroll chamber 65 through the second passage 73.

[0160] Additionally, if used Figure 2 As shown by the dashed arrow, in this compressor, the refrigerant in the scroll chamber 65 flows between the stator 17 and the rotor 11 and simultaneously reaches the suction passage 75c. Therefore, in this compressor, the electric motor 10 can be appropriately cooled by the refrigerant. Furthermore, when the refrigerant flows between the stator 17 and the rotor 11, the lubricating oil 18 flowing out from the second passage 73 into the scroll chamber 65 also flows between the stator 17 and the rotor 11 along with the refrigerant and simultaneously reaches the suction passage 75c. Thus, in this compressor, both the refrigerant and the lubricating oil 18 flow in the suction passage 75c and are drawn from the suction section 30a into the compression chamber 12.

[0161] In this way, the driving scroll 30 and the driven scroll 40 can be appropriately lubricated within the compressor, including the compression chamber 12, by the lubricating oil 18. Furthermore, the lubricating oil in the scroll chamber 65 flows together with the refrigerant between the stator 17 and the rotor 11 and reaches the suction passage 75c. Therefore, the electric motor 10 can be appropriately lubricated by the lubricating oil 18 in this compressor.

[0162] Furthermore, unlike the compressor of Embodiment 1, this compressor does not have a second fluid passage 7 or a connecting passage 9 formed for the second diameter portion 71b. Therefore, the formation of the protrusion 71, including the second diameter portion 71b, is easier in this compressor. Other functions of this compressor are the same as those of the compressor of Embodiment 1.

[0163] Example 3

[0164] like Figure 3 As shown, in the compressor of Embodiment 3, unlike the compressor of Embodiment 1, the outer casing 6 has an outer casing body 61 instead of the outer casing body 60. Furthermore, unlike the compressor of Embodiment 1, the drive scroll member 30 has a cover 77 instead of the cover 37.

[0165] The outer casing 61 is made of aluminum alloy. The outer casing 61 is a bottomed cylindrical member having an outer peripheral wall 61a and a rear wall 61b. The outer peripheral wall 61a is cylindrical with the drive shaft O1 as its center. Similar to the compressor of Embodiment 1, an outer casing cover 62 is fixed to the outer casing 61. Thus, a scroll chamber 65 is formed inside the outer casing 61.

[0166] The rear wall 61b is located at the rear end of the housing body 61. The rear wall 61b extends in a generally circular flat plate shape orthogonal to the drive shaft O1. The outer periphery of the rear wall 61b is connected to the rear end of the outer peripheral wall 61a. In addition, a mounting recess 61c is formed in the rear wall 61b. The mounting recess 61c is recessed from the front to the rear relative to the inner surface of the rear wall 61b.

[0167] Furthermore, a connecting passage 81 is formed in the rear wall 61b. The connecting passage 81 consists of a first connecting passage 81a and a second connecting passage 81b. The first connecting passage 81a extends radially along the outer casing body 61 inside the rear wall 61b and opens on the outer peripheral surface of the rear wall 61b. The opening on the outer peripheral surface of the rear wall 61b in the first connecting passage 81a is provided as a suction port 810, which is connected to the evaporator (not shown) via a pipe (not shown).

[0168] The second connecting path 81b is disposed in the rear wall 61b at a position forward of the first connecting path 81a, and extends through the rear wall 61b in the direction of the drive shaft O1. Thus, the rear end of the second connecting path 81b is connected to the first connecting path 81a. On the other hand, the front end of the second connecting path 81b opens into the mounting recess 61c.

[0169] Additionally, a protrusion 79 is provided inside the outer casing 61. The protrusion 79 is made of steel. The protrusion 79 has a first diameter portion 79a and a second diameter portion 79b. The first diameter portion 79a constitutes the front part of the protrusion 79 and is formed into a generally cylindrical shape with the same size as the first diameter portion 64a in the compressor of Embodiment 1. A pin hole 4a is formed in the first diameter portion 64a. The pin hole 4a is recessed from the front end face of the first diameter portion 79a toward the rear. Therefore, the pin hole 4a does not penetrate the first diameter portion 79a in the direction of the drive shaft center O1. In addition, a first sliding bearing 51 is also provided on the outer peripheral surface of the first diameter portion 79a.

[0170] The second diameter portion 79b is located behind the first diameter portion 79a and constitutes the rear portion of the protrusion 79. The second diameter portion 79b is formed to have a larger diameter than the first diameter portion 79a. The second diameter portion 79b is composed of a main body portion 791 and a flange portion 792. The main body portion 791 constitutes the front portion of the second diameter portion 79b, and the flange portion 792 constitutes the rear portion of the second diameter portion 79b.

[0171] The main body portion 791 is formed to the same size as the main body portion 641 in the compressor of Embodiment 1 and is connected to the first radial portion 79a. The flange portion 792 is formed to have a diameter larger than that of the main body portion 791. Here, the flange portion 792 is formed to have a diameter smaller than that of the flange portion 642 in the compressor of Embodiment 1. Alternatively, the flange portion 792 may be formed to have the same size as the flange portion 642.

[0172] A fluid passage 83 and a first refrigerant passage 85 are formed in the second diameter portion 79b. The fluid passage 83 has a larger diameter than the pin hole 4a and extends along the drive shaft O1 direction inside the main body portion 791 and the flange portion 792, opening at the rear end face of the flange portion 792. The fluid passage 83 is not connected to the pin hole 4a.

[0173] A first refrigerant passage 85 is formed in the main body portion 791 and extends radially through the main body portion 791 in the second diameter portion 79b. Thus, the first refrigerant passage 85 communicates with the fluid passage 83 and opens on the outer peripheral surface of the main body portion 791.

[0174] By engaging the flange portion 792 with the mounting recess 61c, the protrusion 79 is fixed to the rear wall 61b. Thus, the fluid passage 83 communicates with the second connecting passage 81b at its rear end. In this way, the fluid passage 83 communicates with the first connecting passage 81a via the second connecting passage 81b. Furthermore, the rear end of the fluid passage 83 is closed by the rear wall 61b except at the location communicating with the second connecting passage 81b.

[0175] The cover 77, like the cover 37 in the compressor of Embodiment 1, is fixed to the drive peripheral wall 35 by the first bolt 34a. The cover 77 is composed of a cover body portion 77a and an extension portion 77b. In the cover body portion 77a, like the cover body portion 37a in the compressor of Embodiment 1, a recess 37c, a through hole 37d, a return flow path 37f, and a first bolt hole 37g are formed. The extension portion 77b has the same configuration as the extension portion 37b in the compressor of Embodiment 1 and is integrally formed on the cover body portion 77a.

[0176] Furthermore, a second refrigerant passage 77c is formed in the main body portion 77a of the cover 77. The second refrigerant passage 77c extends through the main body portion 77a in the front-rear direction, opening at its front end on the second front surface 771 of the main body portion 77a and at its rear end on the second rear surface 772 of the main body portion 77a. Here, the second refrigerant passage 77c is inclined radially inward towards the cover 77 as it moves from front to rear. Consequently, the rear end of the second refrigerant passage 77c opens at the second rear surface 772 at a position radially inward of the cover 77 compared to the extension 77b.

[0177] Furthermore, in this compressor, no bushing passage 54 is formed for bushing 53. A driven pin 56 is inserted into bushing 53. The driven pin 56 is formed as a solid shaft.

[0178] In this compressor, a rotor 11 is fixed to the outer peripheral surface of the extension 77b. Furthermore, the main body portions 791 of the first diameter portion 79a and the second diameter portion 79b of the protrusion 79 are inserted into the interior of the extension 77b. Therefore, even within this compressor, a gap S is formed between the inner peripheral surface of the extension 77b and the main body portion 791. As a result, the rear end of the second refrigerant passage 77c communicates with the gap S, and the suction portion 30a and the scroll chamber 65 are connected through the second refrigerant passage 77c.

[0179] Furthermore, by bringing the main body portion 791 into the interior of the extension portion 77b, the first refrigerant passage 85 is located inside the extension portion 77b. As a result, the fluid passage 83 communicates with the gap S through the first refrigerant passage 85.

[0180] Furthermore, even in this compressor, the first sliding bearing 51 is inserted into the insertion hole 37d. Thus, the housing 77 is rotatably supported on the first diameter portion 79a via the first sliding bearing 51. Additionally, by inserting the driven pin 56 into the pin hole 4a, the driven scroll member 40 is rotatably supported relative to the first diameter portion 79a about the driven axis O2. The other components of this compressor are the same as those in the compressor of Embodiment 1.

[0181] The compressor is mounted on the vehicle with the suction port 810 facing upwards. Therefore, in this compressor, the first connection passage 81a is located above the opening of the housing body 61 in the direction of gravity, compared to the fluid passage 83.

[0182] Furthermore, in this compressor, if using Figure 3 As shown by the dashed arrow, the low-temperature, low-pressure refrigerant after passing through the evaporator is drawn into the suction port 810, i.e., the first connection 81a, as a suction refrigerant. Furthermore, the suction refrigerant in the first connection 81a flows into the fluid passage 83 via the second connection 81b. Thereby, the suction refrigerant undergoes gas-liquid separation in the fluid passage 83, resulting in a gaseous refrigerant (i.e., a gaseous refrigerant) and a liquid refrigerant (i.e., a liquid refrigerant) 88. In other words, in this compressor, the fluid passage 83 functions as a gas-liquid separation chamber for the suction refrigerant.

[0183] In this way, liquid refrigerant 88 is stored in the fluid passage 83. On the other hand, gaseous refrigerant flows from the fluid passage 83 through the first refrigerant passage 85 and the gap S to the second refrigerant passage 77c. Thus, the gaseous refrigerant flows in the second refrigerant passage 77c and is drawn from the suction section 30a into the compression chamber 12. Furthermore, strictly speaking, the suction refrigerant drawn into the first connection passage 81a also contains lubricating oil 18. Therefore, the lubricating oil 18 contained in the suction refrigerant flows with the gaseous refrigerant from the first refrigerant passage 85 through the gap S to the second refrigerant passage 77c, and is then drawn into the compression chamber 12 through the second refrigerant passage 77c. Additionally, a portion of the lubricating oil 18 contained in the suction refrigerant is stored in the fluid passage 83 along with the liquid refrigerant 88.

[0184] Additionally, if used Figure 3 As shown by the solid arrow, even in this compressor, the lubricating oil 18 in the discharge chamber 14 flows through the return flow path 37f and reaches the recess 37c. Thus, in this compressor, the lubricating oil 18 in the recess 37c lubricates the bushing 53 and the like. Furthermore, while the lubricating oil 18 in the recess 37c flows through the gap between the housing 77 and the driven end plate 41, it is also drawn into the compression chamber 12 from the suction section 30a along with the gaseous refrigerant. In this way, even in this compressor, the driving scroll member 30 and the driven scroll member 40 are lubricated by the lubricating oil 18.

[0185] Thus, in this compressor, by using the fluid passage 83 as a gas-liquid separation chamber, there is no need to provide a separate dedicated space for a gas-liquid separation chamber within the housing 6. Furthermore, the refrigerant drawn into the fluid passage 83 from the connection passage 81 is at a lower temperature and lower pressure than the refrigerant discharged from the compression chamber 12 to the discharge chamber 14. Therefore, in this compressor, the protrusion 79 is less likely to become hot due to the refrigerant drawn into the fluid passage 83, including liquid refrigerant 88, and consequently, the first sliding bearing 51 is less likely to become hot. Moreover, in this compressor, liquid refrigerant 88 is stored in the fluid passage 83, thus, it is suitable to prevent liquid refrigerant 88 from being drawn into the compression chamber 12.

[0186] Furthermore, in this compressor, the suction port 810 is located above the fluid passage 83 in the gravity direction at the opening of the outer casing 61. Therefore, including the suction port 810, the first connection 81a is located above the fluid passage 83 in the gravity direction. Thus, in this compressor, backflow of the liquid refrigerant 88 in the fluid passage 83 in the connection 81 and its exit from the suction port 810 to the outside of the compressor are also appropriately prevented. Other functions of this compressor are the same as those of the compressor in Embodiment 1.

[0187] Example 4

[0188] like Figure 4 As shown, in the compressor of Embodiment 4, the electric motor 10a is provided instead of the electric motor 10 in the compressor of Embodiment 1. The electric motor 10a is also an example of the "drive mechanism" in this invention. In addition, unlike the compressor of Embodiment 1, in this compressor, the drive scroll member 30 has a cover 90 instead of the cover 37.

[0189] The electric motor 10a is housed within the scroll chamber 65. The electric motor 10a consists of a stator 16 and a rotor 19. The stator 16 is cylindrical with a drive shaft O1 as its center and has windings 16a. The stator 16 is formed with a diameter smaller than that of the stator 17 in the compressor of Embodiment 1. Furthermore, the stator 16 is fixed to the second diameter portion 64b by being embedded into the outer peripheral surface of the main body portion 641 of the second diameter portion 64b.

[0190] The rotor 19 is cylindrical around the drive shaft O1. Here, the rotor 19 is formed with a diameter larger than the stator 16 and approximately the same diameter as the housing 90. The rotor 19 covers the stator 17 from the outside by being disposed within the scroll chamber 65. Furthermore, a plurality of third bolt holes 19a are formed in the rotor 19. Each third bolt hole 19a passes through the rotor 19 in the direction of the drive shaft O1.

[0191] The cover 90 is composed of a main cover portion 90a and a wall portion 90b. The main cover portion 90a extends in a generally disk-shaped manner orthogonal to the drive shaft O1 and the driven shaft O2, and is formed with a diameter approximately the same as that of the drive end plate 31 and the drive peripheral wall 35. The main cover portion 90a has a second front surface 901 facing forward and a second rear surface 902 located on the opposite side of the second front surface 901 and facing rearward. In the main cover portion 90a, similar to the main cover portion 37a in the compressor of Embodiment 1, a recess 37c, a through hole 37d, and a return flow path 37f are formed.

[0192] The wall portion 90b is formed into a cylindrical shape with the same diameter as the main body portion 90a. The wall portion 90b is integrally formed on the main body portion 90a and extends rearward from the second rear surface 902 in the direction of the drive axis O1.

[0193] Additionally, a suction passage 90c and a plurality of fourth bolt holes 90d are formed in the cover 90. The suction passage 90c is an example of a "supply passage" in this invention. The suction passage 90c is formed in the cover body portion 90a and extends through the cover body portion 90a in the direction of the drive axis O1. Thus, the front end of the suction passage 90c opens on the second front surface 901, and the rear end of the suction passage 90c opens on the second rear surface 902. Here, the rear end of the suction passage 90c opens on the second rear surface 902 at a position radially inward of the cover body 90 compared to the wall portion 90b.

[0194] Each fourth bolt hole 90d is formed spanning the cover body portion 90a and the wall portion 90b, and penetrates the cover body portion 90a and the wall portion 90b in the direction of the drive shaft center O1. Furthermore, in Figure 4 The diagram shows one of the multiple fourth bolt holes 90d. The same applies to the third bolt hole 19a.

[0195] In this compressor, a cover 90 is disposed between the drive peripheral wall 35 and the rotor 19, and the drive peripheral wall 35, the cover 90, and the rotor 19 are fixed by third bolts 91 inserted into the third and fourth bolt holes 19a and 90d. Thus, in this compressor, the drive scroll 30 can rotate around the drive shaft O1 by the rotation of the rotor 19. Furthermore, in this compressor, the scroll chamber 65 and the suction section 30a are connected via the suction passage 90c. The other components of this compressor are the same as those in Embodiment 1.

[0196] In this compressor, the refrigerant in the scroll chamber 65 flows between the stator 16 and the rotor 19 and reaches the suction passage 90c. Therefore, in this compressor, the electric motor 10a can be suitably cooled by the refrigerant.

[0197] Furthermore, in this compressor, the lubricating oil 18 that has flowed through the second fluid passage 7 and the second fluid passage 8 also flows inside the wall 90b and reaches the suction passage 90c. The refrigerant and lubricating oil 18 flow in the suction passage 90c and are drawn from the suction section 30a into the compression chamber 12. Thus, the suction passage 90c not only draws the refrigerant into the compression chamber 12 but also functions as a supply passage for supplying the lubricating oil 18 to the compression chamber 12. Therefore, even in this compressor, it can perform the same function as the compressor of Embodiment 1.

[0198] The present invention has been described above according to embodiments 1 to 4, but the present invention is not limited to embodiments 1 to 4, and can of course be applied by appropriate modifications without departing from its spirit.

[0199] For example, a compressor can also be formed by appropriately combining the components of the compressors in Examples 1 to 4.

[0200] Alternatively, in the compressors of Examples 1 and 4, the formation of the second fluid passage 7 and the connecting passage 9 may be omitted.

[0201] Alternatively, in the compressor of Embodiment 1, the first diameter portion 64a of the protrusion 64 can be made of steel and the second diameter portion 64b can be made of aluminum alloy. Furthermore, including the first diameter portion 64a, the material of the protrusion 64 can be appropriately designed as long as it has the strength to support the cover 37. The same applies to the compressors of Embodiments 2-4.

[0202] Furthermore, in the compressor of Embodiment 1, the driving scroll member 30 has a cover 37, but it is not limited to this; the driven scroll member 40 may also have a cover 37. The same applies to the compressors of Embodiments 2 to 4.

[0203] Furthermore, in the compressor of Embodiment 1, the outer casing 60 and the protrusion 64 are formed separately, but this is not a limitation; the protrusion 64 may also be integrally formed on the outer casing 60. The same applies to the compressors of Embodiments 2 to 4.

[0204] Alternatively, in the compressor of Embodiment 3, a plate or similar material that promotes gas-liquid separation of the refrigerant may be provided in the fluid passage 83.

[0205] In addition, the following inventions are included in this specification.

[0206] (Note 1)

[0207] A dual-rotary scroll compressor includes a housing, a drive mechanism, a drive scroll component, a driven scroll component, a driven mechanism, and a discharge area.

[0208] The housing has a scroll chamber that houses the driving scroll member and the driven scroll member.

[0209] The driving scroll component is driven to rotate around the driving shaft via the driving mechanism.

[0210] The driven scroll member is eccentric relative to the driving scroll member and rotates driven about the driven axis via the driving scroll member and the driven mechanism.

[0211] The driving scroll member and the driven scroll member form a compression chamber that compresses the fluid through the driving rotation and the driven rotation.

[0212] The fluid compressed in the compression chamber is discharged into the discharge area.

[0213] The dual rotary scroll compressor is characterized in that...

[0214] The housing is provided with a protrusion that protrudes into the chamber of the scroll member in the direction of the drive shaft, facing both the driving scroll member and the driven scroll member.

[0215] The protrusion has a first diameter portion and a second diameter portion with a diameter larger than the first diameter portion.

[0216] The driving scroll member or the driven scroll member has a cover that is rotatably supported on the first radial portion via bearings.

[0217] A fluid passage is formed inside the second diameter, which communicates with the outside of the second diameter and is capable of supplying a specific fluid that is colder and lower in pressure than the fluid in the discharge area.

[0218] (Note 2)

[0219] According to Appendix 1, the dual rotary scroll compressor

[0220] The outer shell and the protrusion are formed separately.

[0221] The second diameter portion is fixed to the outer casing.

[0222] (Note 3)

[0223] According to Appendix 1 or 2, the dual rotary scroll compressor

[0224] The specific fluid is the lubricating oil contained within the fluid.

[0225] The fluid passage allows the lubricating oil to flow and to be stored.

[0226] The protrusion has a first passage and a second passage. The first passage connects to the fluid passage and allows the lubricating oil to flow into the fluid passage. The second passage connects to the fluid passage at a different location than the first passage and allows the lubricating oil in the fluid passage to flow towards the outside of the fluid passage.

[0227] The cover has a return flow path and a supply flow path. The return flow path is connected to the discharge area and the first passage, and the lubricating oil flows from the discharge area toward the first passage. The supply flow path is connected to the second passage and the compression chamber, and the lubricating oil flows from the second passage toward the compression chamber.

[0228] (Note 4)

[0229] According to Appendix 3, the dual rotary scroll compressor

[0230] The driving vortex component has the cover.

[0231] The driven scroll member has a receiving recess facing the first radial portion in the direction of the drive shaft.

[0232] A bushing is accommodated in the receiving recess.

[0233] The bushing is provided with a shaft and forms a bushing passage. The shaft extends in the direction of the drive shaft and is inserted into the first diameter portion. The bushing passage allows the lubricating oil from the return passage to the first passage to flow into the receiving recess.

[0234] A shaft hole is formed inside the shaft body, which extends in the direction of the drive shaft and communicates with the receiving recess and the fluid passage, allowing the lubricating oil to flow from the receiving recess toward the fluid passage.

[0235] (Note 5)

[0236] According to Appendix 1 or 2, the dual rotary scroll compressor

[0237] A suction port is formed in the housing, which allows fluid to be drawn from the outside of the housing into the vortex chamber.

[0238] The specific fluid is the lubricating oil contained within the fluid.

[0239] A connecting passage is formed in the second diameter portion, which connects to the fluid passage and communicates with a position in the vortex chamber that is lower in the direction of gravity than the second diameter portion, allowing the lubricating oil in the vortex chamber to flow toward the fluid passage.

[0240] A suction passage is formed in the cover, which communicates with the fluid passage and the compression chamber and allows the lubricating oil flowing through the fluid passage to flow toward the compression chamber.

[0241] (Note 6)

[0242] According to Appendix 5, the dual rotary scroll compressor

[0243] An extension is formed in the cover body, the extension being cylindrical in the direction of the drive shaft and covering the second diameter portion from the outside.

[0244] A gap is provided between the extension and the second radial portion, which communicates with the vortex chamber and allows fluid to flow within the vortex chamber.

[0245] The suction passage allows the fluid that has flowed through the gap to flow together with the lubricating oil toward the compression chamber.

[0246] (Note 7)

[0247] According to Appendix 1 or 2, the dual rotary scroll compressor

[0248] A connection path is formed in the outer casing, which connects the fluid passage to the outside of the outer casing.

[0249] The specific fluid is the refrigerant that is drawn into the fluid passage through the connection.

[0250] The fluid passage is capable of separating the intake refrigerant gas into a gaseous phase and a liquid phase, and storing the liquid refrigerant.

[0251] The connection path is located above the opening in the outer casing in the direction of gravity, above the fluid passage.

[0252] A first refrigerant passage is formed in the second diameter portion, which allows the gaseous refrigerant in the fluid passage to flow into the vortex chamber.

[0253] A second refrigerant passage is formed in the cover, which communicates with the scroll chamber and the compression chamber and allows the gaseous refrigerant in the scroll chamber to flow toward the compression chamber.

[0254] (Postscript 8)

[0255] The dual rotary scroll compressor according to any one of Appendices 1 to 7

[0256] The driving vortex component has the cover.

[0257] An extension is formed in the cover body, the extension being cylindrical in the direction of the drive shaft and covering the second diameter portion from the outside.

[0258] The drive mechanism has a stator fixed to the housing and disposed within the scroll chamber, and a rotor fixed to the extension and disposed within the stator.

[0259] (Note 9)

[0260] The dual rotary scroll compressor according to any one of Appendices 1 to 7

[0261] The driving vortex component has the cover.

[0262] The drive mechanism has a stator fixed to the second diameter portion and disposed in the scroll chamber, and a rotor covering the stator from the outside and fixed to the cover in the scroll chamber.

[0263] Industrial availability

[0264] This invention can be used in vehicle air conditioning devices, etc.

[0265] Explanation of reference numerals in the attached figures

[0266] 3. First fluid pathway (fluid pathway)

[0267] 5. Pathway 1

[0268] 6. Outer shell

[0269] 7. Second fluid pathway (fluid pathway)

[0270] 8. Second Pathway

[0271] 10. 10a Electric motor (drive mechanism)

[0272] Rotors 11 and 19

[0273] 12 Compression Chamber

[0274] 14. Discharge Chamber (Discharge Area)

[0275] 15 Containment recess

[0276] Stator 16, 17

[0277] 18. Lubricating oil (specific fluid)

[0278] 20 Driven Mechanism

[0279] 30 Driven scroll component

[0280] 37, 75, 77, 90 size covers

[0281] 37b, 77b extension

[0282] 37e, 75c, 90c Inhalation pathway (supply pathway)

[0283] 37f return path

[0284] 40 Driven scroll component

[0285] 51. First sliding bearing (bearing)

[0286] 53 Bushing

[0287] 54 Bushing Passage

[0288] 55 Driven pin (shaft)

[0289] 55a shaft hole

[0290] Protruding bodies 64, 71, 79

[0291] 64a, 71a, 79a, first diameter section

[0292] 64b, 71b, 79b, second diameter section

[0293] 65 Scroll Chamber

[0294] 68. Inhalation port

[0295] 72, 83 Fluid pathways

[0296] 77c Second refrigerant passage

[0297] 81 Connecting Road

[0298] 85 First refrigerant passage

[0299] 88 Liquid refrigerant

[0300] O1 drive shaft

[0301] O2 driven shaft

[0302] S gap

Claims

1. A dual-rotary scroll compressor, comprising a housing, a drive mechanism, a drive scroll component, a driven scroll component, a driven mechanism, and a discharge area. The housing has a scroll chamber that houses the driving scroll member and the driven scroll member. The driving scroll component is driven to rotate around the driving shaft via the driving mechanism. The driven scroll member is eccentric relative to the driving scroll member and rotates driven about the driven axis via the driving scroll member and the driven mechanism. The driving scroll member and the driven scroll member form a compression chamber that compresses the fluid through the driving rotation and the driven rotation. The fluid compressed in the compression chamber is discharged into the discharge area. The dual rotary scroll compressor is characterized in that... The housing is provided with a protrusion that protrudes into the chamber of the scroll member in the direction of the drive shaft, facing both the driving scroll member and the driven scroll member. The protrusion has a first diameter portion and a second diameter portion with a diameter larger than the first diameter portion. The driving scroll member or the driven scroll member has a cover that is rotatably supported on the first radial portion via bearings. A fluid passage is formed inside the second diameter, which communicates with the outside of the second diameter and is capable of supplying a specific fluid that is colder and lower in pressure than the fluid in the discharge area.

2. The dual rotary scroll compressor according to claim 1, The outer shell and the protrusion are formed separately. The second diameter portion is fixed to the outer casing.

3. The dual rotary scroll compressor according to claim 1 or 2, The specific fluid is the lubricating oil contained within the fluid. The fluid passage allows the lubricating oil to flow and to be stored. The protrusion has a first passage and a second passage. The first passage connects to the fluid passage and allows the lubricating oil to flow into the fluid passage. The second passage connects to the fluid passage at a different location than the first passage and allows the lubricating oil in the fluid passage to flow towards the outside of the fluid passage. The cover has a return flow path and a supply flow path. The return flow path is connected to the discharge area and the first passage, and the lubricating oil flows from the discharge area toward the first passage. The supply flow path is connected to the second passage and the compression chamber, and the lubricating oil flows from the second passage toward the compression chamber.

4. The dual-rotary scroll compressor according to claim 3, The driving vortex component has the cover. The driven scroll member has a receiving recess facing the first radial portion in the direction of the drive shaft. A bushing is housed in the receiving recess. The bushing is provided with a shaft and forms a bushing passage. The shaft extends in the direction of the drive shaft and is inserted into the first diameter portion. The bushing passage allows the lubricating oil from the return passage to the first passage to flow into the receiving recess. A shaft hole is formed inside the shaft body, which extends in the direction of the drive shaft center and communicates with the receiving recess and the fluid passage, allowing the lubricating oil to flow from the receiving recess toward the fluid passage.

5. The dual rotary scroll compressor according to claim 1 or 2, A suction port is formed in the housing, which allows fluid to be drawn from the outside of the housing into the vortex chamber. The specific fluid is the lubricating oil contained within the fluid. A connecting passage is formed in the second diameter portion, which connects to the fluid passage and communicates with a position in the vortex chamber that is lower in the direction of gravity than the second diameter portion, allowing the lubricating oil in the vortex chamber to flow toward the fluid passage. A suction passage is formed in the cover, which communicates with the fluid passage and the compression chamber and allows the lubricating oil flowing through the fluid passage to flow toward the compression chamber.

6. The dual rotary scroll compressor according to claim 5, An extension is formed in the cover body, the extension being cylindrical in the direction of the drive shaft and covering the second diameter portion from the outside. A gap is provided between the extension and the second radial portion, which communicates with the vortex chamber and allows fluid to flow within the vortex chamber. The suction passage allows the fluid that has flowed through the gap to flow together with the lubricating oil toward the compression chamber.

7. The dual rotary scroll compressor according to claim 1 or 2, A connection path is formed in the outer casing, which connects the fluid passage to the outside of the outer casing. The specific fluid is the refrigerant that is drawn into the fluid passage through the connection. The fluid passage is capable of separating the intake refrigerant gas into a gaseous phase and a liquid phase, and storing the liquid refrigerant. The connection path is located above the opening in the outer casing in the direction of gravity, above the fluid passage. A first refrigerant passage is formed in the second diameter portion, which allows the gaseous refrigerant in the fluid passage to flow into the vortex chamber. A second refrigerant passage is formed in the cover, which communicates with the scroll chamber and the compression chamber and allows the gaseous refrigerant in the scroll chamber to flow toward the compression chamber.

8. The dual rotary scroll compressor according to claim 1 or 2, The driving vortex component has the cover. An extension is formed in the cover body, the extension being cylindrical in the direction of the drive shaft and covering the second diameter portion from the outside. The drive mechanism has a stator fixed to the housing and disposed within the scroll chamber, and a rotor fixed to the extension and disposed within the stator.

9. The dual rotary scroll compressor according to claim 1 or 2, The driving vortex component has the cover. The drive mechanism has a stator fixed to the second diameter portion and disposed in the scroll chamber, and a rotor covering the stator from the outside and fixed to the cover in the scroll chamber.

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