Electric compressor

Abstract

The present application provides an electric compressor capable of achieving equalization of potential of a casing while maintaining ease of disassembly of the casing. A casing in which a compression mechanism and a motor mechanism are housed has: a first casing portion made of metal, which has a first joint surface and a first pin hole formed in the first joint surface; a second casing portion made of metal, which has a second joint surface that opposes the first joint surface and a second pin hole formed in the second joint surface at a position that opposes the first pin hole; a link pin made of metal, which has a press-in portion that is pressed into the first pin hole and a first abutment portion that protrudes from an outer peripheral surface and abuts against an inner peripheral surface of the second pin hole and is capable of being inserted into the second pin hole in a pluggable manner; and a first gasket that is made of an insulating material, which is interposed between the first joint surface and the second joint surface and has a first pin through hole through which the link pin is inserted.

Description

Technical Field

[0001] This invention relates to an electric compressor. Background Technology

[0002] Patent Document 1 discloses an example of a conventional electric compressor. In this electric compressor, a compression mechanism and a motor mechanism are housed within a housing.

[0003] The housing has a first housing part made of metal, a second housing part made of metal, an insulating gasket sandwiched between the first housing part and the second housing part, and a metal insertion member.

[0004] A first insertion hole is formed on the mating surface of the first housing portion that engages with the second housing portion, for inserting one end of an insertion member. A second insertion hole is formed on the mating surface of the second housing portion that engages with the first housing portion, opposite to the first insertion hole, for inserting the other end of the insertion member. A through hole is formed on the gasket at a position corresponding to both the first and second insertion holes, for the insertion member to pass through.

[0005] The insert member is formed by rolling a thin plate into a cylindrical shape, and is approximately C-shaped when viewed from the axial direction. In its natural state, the insert member has an outer diameter larger than the inner diameter of both the first and second insert holes.

[0006] In this electric compressor, one end of the insertion member is inserted into the first insertion hole while its diameter decreases due to elastic deformation, and the other end of the insertion member is inserted into the second insertion hole while its diameter decreases due to elastic deformation. As a result, the inner circumferential surfaces of both the first and second insertion holes are pressed together by the elastic force of the outer circumferential surface of the insertion member. Consequently, the first housing portion and the second housing portion are reliably electrically connected via the insertion member, ensuring equipotentiality between the first and second housing portions.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: Japanese Patent Application Publication No. 2020-70741 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] However, in the aforementioned conventional electric compressors, the insertion member inserts into both the first and second insertion holes simultaneously during elastic deformation. Therefore, assuming the housing needs to be disassembled for maintenance or other reasons, removing the second housing portion relative to the first housing portion requires a significant force due to the elastic force of the insertion member, potentially making the removal operation difficult.

[0012] The present invention was made in view of the above-mentioned conventional realities, and the problem to be solved is to provide an electric compressor that can achieve equipotentiality of the housing while maintaining the ease of disassembly of the housing.

[0013] Solution for solving the problem

[0014] The electric compressor of the present invention houses a compression mechanism and a motor mechanism within a housing.

[0015] The electric compressor is characterized in that...

[0016] The housing includes:

[0017] A first housing portion made of metal, having a first mating surface and a first pin hole formed on the first mating surface;

[0018] A second housing portion made of metal has a second mating surface facing the first mating surface and a second pin hole formed on the second mating surface at a position opposite to the first pin hole.

[0019] A metal connecting pin has a press-in portion that is pressed into a first pin hole and a first abutting portion that protrudes from its outer peripheral surface and abuts against the inner peripheral surface of a second pin hole, and is insertable into the second pin hole; and

[0020] An insulating first gasket is sandwiched between the first mating surface and the second mating surface and has a first pin through hole through which the connecting pin passes.

[0021] In the electric compressor of the present invention, the first insertion portion of the connecting pin can be inserted into the second pin hole of the second housing portion. That is, the outer peripheral surface of the first insertion portion is not pressed against the inner peripheral surface of the second pin hole under the action of elastic force. Therefore, when the housing is disassembled, the first insertion portion can be easily pulled out from the second pin hole. In addition, when the first insertion portion is pulled out from the second pin hole, the connecting pin whose pressing portion is pressed into the first pin hole of the first housing portion will not fall out of the first pin hole. Therefore, the second housing portion can be easily removed relative to the first housing portion.

[0022] Furthermore, the first housing portion is electrically connected to the connecting pin by pressing the insertion portion into the first pin hole, and the second housing portion is electrically connected to the connecting pin by abutting the first abutment portion of the first insertion portion against the inner circumferential surface of the second pin hole. Therefore, the first housing portion and the second housing portion are at the same potential by means of the connecting pin.

[0023] Therefore, the electric compressor of the present invention can achieve equipotentiality of the housing while maintaining the ease of disassembly of the housing.

[0024] Preferably, the second pin hole penetrates the second housing portion, and the second housing portion has a third mating surface facing the side opposite to the second mating surface. Additionally, preferably, the housing also includes a metal third housing portion, an insulating second gasket, and a metal fastening connecting member. Alternatively, the third housing portion may have a fourth mating surface facing the third mating surface and a third pin hole formed on the fourth mating surface at a position opposite to the second pin hole. Alternatively, the second gasket may be sandwiched between the third and fourth mating surfaces and have a second pin through hole through which the connecting pin passes. Alternatively, the fastening connecting member may fasten the first housing portion and the third housing portion together by sandwiching the second housing portion in the middle. Furthermore, preferably, the connecting pin also has a second insertion portion disposed in the longitudinal direction of the connecting pin on the side opposite to the press-in portion relative to the first insertion portion. Preferably, the outer diameter of the second insertion portion is smaller than the inner diameter of the third pin hole.

[0025] In this case, when disassembling the housing, after removing the fastening connection of the fastening structure, the second insertion part of the connecting pin, whose outer diameter is smaller than the inner diameter of the third pin hole of the third housing part, can be easily pulled out from the third pin hole. Therefore, the third housing part can be easily removed relative to the second housing part.

[0026] Furthermore, the first housing portion and the third housing portion are fastened together by a fastening connecting member. Therefore, one of the first housing portion and the third housing portion is electrically connected to the fastening connecting member by abutting against its head, and the other of the first housing portion and the third housing portion is electrically connected to the fastening connecting member by abutting against its threaded portion. Thus, the first housing portion and the third housing portion are at the same potential by means of the fastening connecting member. Furthermore, the first housing portion and the second housing portion are at the same potential by means of a connecting pin, thus the first housing portion, the second housing portion, and the third housing portion are at the same potential.

[0027] Preferably, the first abutting portion has a groove recessed on the outer peripheral surface of the connecting pin and a pair of protrusions protruding from the outer peripheral surface and arranged side by side in the circumferential direction of the connecting pin, sandwiching the groove.

[0028] In this case, a groove and a pair of protrusions are formed by stamping at a specified position on the outer peripheral surface of the connecting pin, thereby easily forming the first abutment of the connecting pin.

[0029] Preferably, there are multiple first contact portions.

[0030] In this case, the inner circumferential surface of the second pin hole reliably abuts against the first abutting part of the first insertion part, so the second housing part is electrically connected to the connecting pin with high reliability.

[0031] Preferably, the plurality of first abutment portions are arranged at equal intervals in the circumferential direction of the connecting pin.

[0032] In this case, the center of the outer circle of each first abutment portion is easily aligned with the center of the second pin hole. Therefore, when using the connecting pin to position the second housing portion relative to the first housing portion, it becomes advantageous for improving positioning accuracy.

[0033] Preferably, the second pin hole penetrates the second housing portion, and the second housing portion has a third mating surface facing the side opposite to the second mating surface. Additionally, preferably, the housing also includes a metallic third housing portion and an insulating second gasket. Alternatively, the third housing portion may have a fourth mating surface facing the third mating surface and a third pin hole formed on the fourth mating surface at a position opposite to the second pin hole. Alternatively, the second gasket may be sandwiched between the third and fourth mating surfaces and have a second pin through hole through which the connecting pin passes. Furthermore, preferably, the connecting pin also has a second insertion portion disposed along the length of the connecting pin on the side opposite to the press-in portion, opposite to the first insertion portion. Preferably, the second insertion portion has a second abutting portion protruding from the outer peripheral surface of the second insertion portion and abutting against the inner peripheral surface of the third pin hole, and can be inserted and removed relative to the third pin hole.

[0034] In this case, the second insertion part of the connecting pin can be inserted into the third pin hole of the third housing part. That is, the outer peripheral surface of the second insertion part is not pressed against the inner peripheral surface of the third pin hole under the action of elastic force. Therefore, when the housing is disassembled, the second insertion part can be easily pulled out from the third pin hole. As a result, the third housing part can be easily removed relative to the second housing part.

[0035] Furthermore, the third housing portion is electrically connected to the connecting pin by abutting the second abutting portion of the second insertion portion against the inner circumferential surface of the third pin hole. The first housing portion and the second housing portion are also electrically connected via the connecting pin. As a result, the first housing portion, the second housing portion, and the third housing portion are electrically connected by the connecting pin and thus become equipotential.

[0036] Invention Effects

[0037] The electric compressor of the present invention can achieve equipotentiality of the housing while maintaining the ease of disassembly of the housing. Attached Figure Description

[0038] Figure 1 This is a cross-sectional view of the electric compressor in Example 1.

[0039] Figure 2 The electric compressor relates to Embodiment 1, and is a front view of the connecting pin.

[0040] Figure 3 The electric compressor relates to Embodiment 1, and is Figure 2 A sectional view along line AA.

[0041] Figure 4 The electric compressor relates to Embodiment 1, and is shown in a partial cross-sectional view with the connecting pin and its vicinity enlarged.

[0042] Figure 5 The electric compressor relates to Embodiment 1, and is shown as a partial cross-sectional view with the fastening connection structure and its vicinity enlarged.

[0043] Figure 6 The electric compressor relates to Embodiment 1, and is shown in a partial perspective view with a connecting pin inserted in the first housing portion.

[0044] Figure 7 The electric compressor of Embodiment 1 is illustrated in a schematic diagram to show the equipotentiality of the housing.

[0045] Figure 8 The electric compressor relates to Embodiment 2 and is a schematic diagram illustrating the equipotentiality of the housing.

[0046] Explanation of reference numerals in the attached figures

[0047] 1. Shell

[0048] 3-axis support housing (second housing section)

[0049] 3e Front end face (second mating surface)

[0050] 3D rear end face (third mating surface)

[0051] 3h second pin hole

[0052] 5 drive shafts (compression mechanism)

[0053] 7 motor mechanism

[0054] 9. Fixed scroll plate (compression mechanism)

[0055] 11. Movable scroll plate (compression mechanism)

[0056] 13. Compression Section Housing (Third Housing Section)

[0057] 13h Third pin hole

[0058] 13i front end face (fourth mating surface)

[0059] 15 Motor housing (first housing section)

[0060] 15e rear end face (first mating surface)

[0061] 15g First pin hole

[0062] 25 bolts (for fastening structural components)

[0063] 61 First Pad

[0064] 61b First pin through hole

[0065] 63 Second Pad

[0066] 63b Second Pin Through Hole

[0067] 51, 55 connecting pins

[0068] 51a and 55a outer peripheral surfaces

[0069] 51b, 55b First Abutment Section

[0070] 55c Second Contact Section

[0071] 511, 551 Press-in Section

[0072] 512, 552 First Insertion Section

[0073] 513, 553 Second Insertion Section

[0074] 52 slots

[0075] 53 protrusion. Detailed Implementation

[0076] Hereinafter, embodiments 1 and 2, which embody the present invention, will be described with reference to the accompanying drawings.

[0077] (Example 1)

[0078] The electric compressor of Example 1 (hereinafter referred to as the compressor) is as follows: Figure 1 The image shows an electric compressor for a vehicle's air conditioning system. The compressor includes a housing 1, a drive shaft 5, a motor mechanism 7, a fixed scroll 9, a movable scroll 11, and a spring plate 47.

[0079] The housing 1 includes a motor housing 15, a first gasket 61, a shaft support housing 3, a second gasket 63, a compression housing 13, a connecting pin 51, and a bolt 25.

[0080] Motor housing 15 is an example of a "first housing part" in this invention. Shaft support housing 3 is an example of a "second housing part" in this invention. Compression housing 13 is an example of a "third housing part" in this invention. Drive shaft 5, fixed scroll 9, movable scroll 11, and elastic plate 47 are examples of a "compression mechanism" in this invention. Bolt 25 is an example of a "fastening connection member" in this invention.

[0081] In this embodiment, as Figure 1As shown, the side containing the motor housing 15 is designated as the front side of the compressor, and the side containing the compression housing 13 is designated as the rear side of the compressor, thus defining the compressor's front-rear direction. Additionally, the compressor's vertical direction is also defined. It should be noted that the above directions are merely examples for ease of explanation; the compressor's orientation may be appropriately adjusted according to the vehicle it is mounted on.

[0082] like Figures 2-4 As shown, the connecting pin 51 is made of metal and is generally cylindrical. The connecting pin 51 has a cylindrical outer peripheral surface 51a with an outer diameter d; and three first abutment portions 51b that protrude radially outward from the outer peripheral surface 51a at the center of the connecting pin 51 along its length. The three first abutment portions 51b are arranged at equal intervals of 120 degrees in the circumferential direction of the outer peripheral surface 51a. The diameter D of the circumscribed circle C of the three first abutment portions 51b, i.e., the circumscribed circle C that contacts the protruding front end of each protrusion 53 (described later) of each first abutment portion 51b, is larger than the outer diameter d of the outer peripheral surface 51a.

[0083] Each first abutting portion 51b is formed by stamping at a predetermined position on the outer peripheral surface 51a. Each first abutting portion 51b has a groove 52 recessed in the outer peripheral surface 51a and extending along the length direction, and a pair of protrusions 53 protruding from the outer peripheral surface 51a and extending along the length direction, sandwiching the groove 52 and arranged side by side in the circumferential direction of the outer peripheral surface 51a.

[0084] The connecting pin 51 has a press-in portion 511, a first insertion portion 512, and a second insertion portion 513, which are arranged in this order from one end to the other in the length direction. The press-in portion 511 and the second insertion portion 513 are formed as so-called straight portions extending along the length direction with a constant outer diameter d in the regions at both ends of the connecting pin 51 in the length direction. The first insertion portion 512 is formed in the region of the central portion in the length direction of the connecting pin 51, and three first abutment portions 51b are formed on the outer peripheral surface 51a of the first insertion portion 512.

[0085] like Figure 5 As shown, the bolt 25 is made of metal and integrally formed with a head 25a and a shaft portion 25b. An external thread portion 25c is provided at the front end of the shaft portion 25b.

[0086] like Figure 1 As shown, the motor housing 15 is a bottomed cylindrical shape and has a front wall 15a and a first peripheral wall 15b. The front wall 15a is located at the front end of the motor housing 15 and extends radially along the motor housing 15. The first peripheral wall 15b extends rearward from the front wall 15a in the direction of the drive shaft center O of the drive shaft 5. Through these front walls 15a and the first peripheral wall 15b, a motor chamber 17 is formed within the motor housing 15. It should be noted that the drive shaft center O is parallel to the front-rear direction of the compressor.

[0087] A suction port 15c communicating with the motor chamber 17 is formed on the first peripheral wall 15b of the motor housing 15. The suction port 15c is connected to an evaporator (not shown) and draws in the refrigerant, which has passed through the evaporator, into the motor chamber 17. That is, the motor chamber 17 also serves as the suction chamber.

[0088] A support portion 15d is formed on the front wall 15a of the motor housing 15, protruding from the front wall 15a toward the motor chamber 17. The support portion 15d is cylindrical and a first radial bearing 19 is disposed inside it.

[0089] like Figures 4-7 As shown, six bottomed internal threaded holes 15f are formed on the rear end face 15e of the first peripheral wall 15b for engagement with the external thread portion 25c of the bolt 25. The rear end face 15e is an example of the "first mating surface" in this invention. The internal threaded holes 15f are arranged at equal intervals, i.e., a 60-degree pitch, in the circumferential direction of the first peripheral wall 15b. In addition, two bottomed first pin holes 15g are formed on the rear end face 15e of the first peripheral wall 15b. The first pin holes 15g are arranged at a 180-degree pitch in the circumferential direction of the first peripheral wall 15b. Each first pin hole 15g has a circular cross-section and an inner diameter smaller than the outer diameter d of the outer peripheral surface 51a of the connecting pin 51, i.e., the outer diameter d of the outer peripheral surface 51a of the press-in portion 511. That is, the press-in portion 511 of the connecting pin 51 is pressed into the first pin hole 15g.

[0090] like Figure 1 As shown, the shaft support housing 3 is disposed between the motor housing 15 and the compression housing 13. On the outer periphery of the shaft support housing 3, six first bolt through holes 3g are formed at positions corresponding in the circumferential direction to the internal threaded holes 15f of the first peripheral wall 15b. Each first bolt through hole 3g passes through the shaft support housing 3 in the front-rear direction. Each first bolt through hole 3g has an inner diameter larger than the outer diameter of the shaft portion 25b of the bolt 25.

[0091] Furthermore, on the outer periphery of the shaft support housing 3, two second pin holes 3h are formed at positions corresponding to the first pin holes 15g of the first peripheral wall 15b in the circumferential direction. Each second pin hole 3h passes through the shaft support housing 3 in the front-rear direction. Each second pin hole 3h has a circular cross-section and an inner diameter that is larger than the outer diameter d of the outer peripheral surface 51a of the connecting pin 51 and equal to the diameter D of the circumscribed circle C of each first abutment portion 51b. That is, the protrusion 53 of the first abutment portion 51b in the first insertion portion 512 of the connecting pin 51 abuts against the inner peripheral surface of the second pin hole 3h, and the first insertion portion 512 can be inserted into the second pin hole 3h in a push-pull manner.

[0092] The compression housing 13 is a bottomed cylindrical shape and has a rear wall 13a and a second peripheral wall 13b. The rear wall 13a is located at the rear end of the compression housing 13 and extends radially along the compression housing 13. The second peripheral wall 13b extends forward from the rear wall 13a in the direction of the drive shaft center O.

[0093] Also on the second circumferential wall 13b of the compression housing 13, six second bolt through holes 13g are formed at positions corresponding circumferentially to the internal threaded holes 15f of the first circumferential wall 15b. Each second bolt through hole 13g passes through the compression housing 13 in the front-rear direction. Each second bolt through hole 13g has an inner diameter larger than the outer diameter of the shaft portion 25b of the bolt 25. In addition, also on the second circumferential wall 13b of the compression housing 13, two bottomed third pin holes 13h are formed at positions corresponding circumferentially to the first pin holes 15g of the first circumferential wall 15b. Each third pin hole 13h has a circular cross-section and an inner diameter larger than the outer diameter d of the outer circumferential surface 51a of the connecting pin 51.

[0094] An oil separation chamber 13c and a discharge port 13f are formed in the compression section housing 13. A cylindrical separator 21 is fixed inside the oil separation chamber 13c. A separator is formed by the outer peripheral surface of the separator 21 and the inner peripheral surface of the oil separation chamber 13c. The discharge port 13f communicates with the oil separation chamber 13c and is connected to a condenser (not shown).

[0095] The first gasket 61 and the second gasket 63 are at least surface-formed from synthetic rubber and are insulating. The first gasket 61 is sandwiched between the rear end face 15e of the motor housing 15 and the front end face 3e of the shaft support housing 3, which is opposite to the rear end face 15e in the front-rear direction, thereby sealing the motor housing 15 and the shaft support housing 3. The second gasket 63 is sandwiched between the rear end face 3d of the shaft support housing 3 and the front end face 13i of the compression housing 13, which is opposite to the rear end face 3d in the front-rear direction, thereby sealing the shaft support housing 3 and the compression housing 13. The front end face 3e of the shaft support housing 3 is an example of the "second mating surface" in this invention. The rear end face 3d of the shaft support housing 3 is an example of the "third mating surface" in this invention. The front end face 13i of the compression housing 13 is an example of the "fourth mating surface" in this invention.

[0096] In the first gasket 61, six bolt through holes 61a are formed at positions corresponding circumferentially to the internal threaded holes 15f of the first peripheral wall 15b. Additionally, in the first gasket 61, two first pin through holes 61b are formed at positions corresponding circumferentially to the first pin holes 15g of the first peripheral wall 15b. Similarly, in the second gasket 63, six bolt through holes 63a are formed at positions corresponding circumferentially to the internal threaded holes 15f of the first peripheral wall 15b. Additionally, in the second gasket 63, two second pin through holes 63b are formed at positions corresponding circumferentially to the first pin holes 15g of the first peripheral wall 15b. The inner diameters of the bolt through holes 61a and 63a are larger than the outer diameter of the shaft portion 25b of the bolt 25. The inner diameters of the first pin through holes 61b and 63b are larger than the outer diameter d of the outer peripheral surface 51a of the connecting pin 51.

[0097] The motor housing 15, the shaft support housing 3, and the compression housing 13 are fastened together from the compression housing 13 side by a plurality of bolts 25 (6 in this embodiment) while the first gasket 61 is sandwiched between the motor housing 15 and the shaft support housing 3 and the second gasket 63 is sandwiched between the shaft support housing 3 and the compression housing 13.

[0098] In the fastened connection state where the motor housing 15 and the compression housing 13 are sandwiched between the shaft support housing 3 and fastened together by bolts 25, the heads 25a of each bolt 25 abut against the compression housing 13, the shaft portions 25b of each bolt 25 pass through the second bolt through holes 13g of the compression housing 13 and the first bolt through holes 3g of the shaft support housing 3 without contact, and the external thread portions 25c of each bolt 25 are screwed into the internal thread holes 15f of the motor housing 15. It should be noted that the shaft portions 25b of each bolt 25 pass through the bolt through holes 61a of the first gasket 61 and the bolt through holes 63a of the second gasket 63 without contact.

[0099] Furthermore, in the aforementioned fastened connection state, the press-in portion 511 of each connecting pin 51 is pressed into each first pin hole 15g of the motor housing 15, the protrusion 53 of each first abutting portion 51b of each first insertion portion 512 of each connecting pin 51 abuts against the inner peripheral surface of each second pin hole 3h of the shaft support housing 3, and the second insertion portion 513 of each connecting pin 51 is inserted into the inner peripheral surface of each third pin hole 13h of the compression housing 13 without contact.

[0100] A boss 3a protruding toward the motor chamber 17 is formed on the shaft support housing 3. A plurality of rotation-stopping pins 31 extending rearward from the shaft support housing 3 are fixed on the rear surface side of the shaft support housing 3. In addition, a first suction passage 3c that passes through the shaft support housing 3 in the front-rear direction is formed on the outer periphery of the shaft support housing 3.

[0101] The drive shaft 5 extends along the drive shaft center O and has a small-diameter portion 5a at the front end and a large-diameter portion 5b at the rear end. An eccentric pin 50 extending rearward from an off-center position from the drive shaft center O is fixed to the rear end face of the large-diameter portion 5b. The eccentric pin 50 is fitted into the bushing 50a within the boss 3a.

[0102] The small-diameter portion 5a of the drive shaft 5 is rotatably supported on the support portion 15d of the motor housing 15 by means of the first radial bearing 19. The rear end of the large-diameter portion 5b is rotatably supported on the second radial bearing 27 within the boss 3a. The drive shaft 5 is rotatable about the drive axis O within the housing 1.

[0103] The motor mechanism 7 is housed within the motor chamber 17. The motor mechanism 7 has a stator 7a and a rotor 7b. The stator 7a is fixed to the inner circumferential surface of the first peripheral wall 15b. The stator 7a is connected to an inverter (not shown) disposed outside the motor housing 15.

[0104] The rotor 7b is disposed within the stator 7a and fixed to the large-diameter portion 5b of the drive shaft 5. The rotor 7b rotates within the stator 7a, thereby causing the drive shaft 5 to rotate about the drive axis O.

[0105] The fixed scroll 9 is fixed to the compression housing 13 and disposed on the inner peripheral side of the second peripheral wall 13b. The fixed scroll 9 has a fixed base plate 9a, a fixed scroll wall 9b, and an annular outer peripheral wall 9c. The fixed base plate 9a is located at the rear end of the fixed scroll 9 and is formed in a disk shape. The fixed scroll wall 9b is disposed on the radially inner side of the outer peripheral wall 9c and extends forward from the fixed base plate 9a.

[0106] A discharge chamber 35 is formed between the rear surface of the fixed substrate 9a and the front surface of the rear wall 13a of the compression housing 13. A discharge port 9d is formed on the fixed substrate 9a, through which the fixed substrate 9a passes. The discharge port 9d connects the discharge chamber 35 to the compression chamber 45, which will be described later. The discharge chamber 35 is connected to the oil separation chamber 13c through the discharge passage 13e.

[0107] A discharge needle reed valve 37 and a retainer 39 are mounted on a fixed base plate 9a. The discharge needle reed valve 37 and the retainer 39 are disposed within the discharge chamber 35. The discharge needle reed valve 37 opens and closes the discharge port 9d by elastic deformation. The retainer 39 adjusts the amount of elastic deformation of the discharge needle reed valve 37.

[0108] A second suction passage 9e is formed between the outer peripheral wall 9c and the second peripheral wall 13b of the compression housing 13. A suction port 9f is formed on the outer peripheral wall 9c, which connects the second suction passage 9e to the compression chamber 45 described later.

[0109] A movable scroll 11 is disposed within the compression housing 13 and located between the fixed scroll 9 and the shaft support housing 3. The movable scroll 11 has a movable base plate 11a and a movable scroll wall 11b. The movable base plate 11a is located at the front end of the movable scroll 11 and is formed in a disk shape. A bushing 50a is rotatably supported on the movable base plate 11a by means of a third radial bearing 41. Thus, the movable scroll 11 is connected to the drive shaft 5 at an eccentric position from the drive shaft center O via the bushing 50a and the eccentric pin 50.

[0110] Furthermore, a rotation-stopping hole 11c is recessed in the movable substrate 11a to receive the front end of each rotation-stopping pin 31 in a clearance-fitted state. A cylindrical ring 43 is loosely fitted into each rotation-stopping hole 11c. By sliding and rolling on the inner circumferential surface of the ring 43, the movable scroll 11 can be restricted to revolve around the sun.

[0111] The movable scroll wall 11b extends rearward from the movable substrate 11a. An air supply hole 11d is provided through the center of the movable scroll wall 11b, which opens at the front end of the movable scroll wall 11b and extends in the front-rear direction to the movable substrate 11a.

[0112] The fixed scroll plate 9 and the movable scroll plate 11 mesh with each other. Thus, a compression chamber 45 is formed between the fixed scroll plate 9 and the movable scroll plate 11 via a fixed base plate 9a, a fixed scroll wall 9b, a movable base plate 11a, and a movable scroll wall 11b. The compression chamber 45 communicates with the motor chamber 17, which functions as a suction chamber, via a first suction passage 3c, a second suction passage 9e, and a suction port 9f.

[0113] An elastic plate 47, made of a thin metal sheet, is provided between the fixed scroll 9, the movable scroll 11, and the shaft support housing 3. The movable scroll 11 is forced towards the fixed scroll 9 by the restoring force of the elastic plate 47 during elastic deformation.

[0114] A back pressure chamber 49 is formed within the boss 3a of the shaft support housing 3 via the movable base plate 11a and the elastic plate 47. The back pressure chamber 49 communicates with the air supply port 11d.

[0115] In this compressor, the motor mechanism 7 operates while the inverter is controlled, causing the drive shaft 5 to rotate around the drive axis O, which in turn rotates the movable scroll 11. As a result, refrigerant introduced into the motor chamber 17 from the suction port 15c is drawn into the compression chamber 45 through the first suction passage 3c, the second suction passage 9e, and the suction port 9f. Then, under the action of the rotation of the movable scroll 11, the compression chamber 45 reduces its volume while compressing the refrigerant inside. Furthermore, under the action of the rotation of the movable scroll 11, a portion of the high-pressure refrigerant in the compression chamber 45 flows into the back pressure chamber 49 through the air supply port 11d, making the back pressure chamber 49 high-pressure. Therefore, under the pressure of the elastic plate 47 and the back pressure chamber 49, the movable scroll 11 is forced towards the fixed scroll 9, and the compression chamber 45 is effectively sealed.

[0116] The high-pressure refrigerant, compressed by the compression chamber 45, is discharged from the discharge port 9d to the discharge chamber 35, and then from the discharge chamber 35 through the discharge passage 13e to the oil separation chamber 13c. Thereafter, the high-pressure refrigerant separates the lubricating oil within the oil separation chamber 13c, flows inside the separator 21, and is discharged from the discharge port 13f. The lubricating oil separated from the refrigerant flows through a filter (not shown) and an oil supply passage, thereby supplying the sliding parts of the fixed scroll 9 and the movable scroll 11.

[0117] In this compressor with the above-described structure, the motor housing 15 and the compressor housing 13 are fastened together by bolts 25. Therefore, the bolt 25 is electrically connected to the compressor housing 13 by abutting against the head 25a of the bolt 25, and is also electrically connected to the motor housing 15 by screwing the external thread 25c of the bolt 25 into the internal threaded hole 15f of the motor housing 15. Thus, the motor housing 15 and the compressor housing 13 are electrically connected and at the same potential by means of the bolts 25.

[0118] Furthermore, the pressing portion 511 of the connecting pin 51 is pressed into the first pin hole 15g of the motor housing 15, and the protrusions 53 of each first abutment portion 51b of the connecting pin 51 abut against the inner circumferential surface of the second pin hole 3h of the shaft support housing 3. Thus, the motor housing 15 and the shaft support housing 3 are electrically connected and become equipotential by means of the connecting pin 51.

[0119] In this way, the motor housing 15, the shaft support housing 3, and the compression housing 13 are made to be at the same potential by means of the connecting pin 51 and the bolt 25.

[0120] Furthermore, in this compressor, if the housing 1 is disassembled for maintenance or other reasons, the bolts 25 that fasten the compressor housing 13 to the motor housing 15 are first removed. Then, the compressor housing 13 is removed from the motor housing 15 and the shaft support housing 3. At this time, the outer diameter d of the second insertion portion 513 of the connecting pin 51 is smaller than the inner diameter of the third pin hole 13h of the compressor housing 13, and the second insertion portion 513 does not contact the inner circumferential surface of the third pin hole 13h, so the second insertion portion 513 can be easily pulled out from the third pin hole 13h. That is, the connecting pin 51 does not obstruct the removal of the compressor housing 13.

[0121] Next, the shaft support housing 3 is removed from the motor housing 15. The diameter D of the circumscribed circle C of each of the first abutment portions 51b in the first insertion portion 512 of the connecting pin 51 is equal to the inner diameter of the second pin hole 3h, allowing the first insertion portion 512 to be inserted and removed relative to the second pin hole 3h. Therefore, the first insertion portion 512 will not press against the inner circumferential surface of the second pin hole 3h under elastic force, and the connecting pin 51 will not obstruct the removal of the shaft support housing 3. Furthermore, at this time, the press-in portion 511 of the connecting pin 51 is fixed to the first pin hole 15g of the motor housing 15 by pressing, so the connecting pin 51 will not fall off the motor housing 15.

[0122] In this way, the compression housing 13 and the shaft support housing 3 can be easily removed from the motor housing 15.

[0123] Therefore, the compressor is able to achieve equipotentiality of the housing 1 while maintaining the ease of disassembly of the housing 1.

[0124] Especially in this compressor, when assembling the shaft support housing 3 and the compression section housing 13 relative to the motor housing 15, each connecting pin 51 functions well as a locating pin. That is, during the assembly of the housing 1, as... Figure 6 As shown, each connecting pin 51 is first pressed into the first pin hole 15g of the motor housing 15. This ensures good concentricity between the connecting pin 51 and the first pin hole 15g while fixing the connecting pin 51 relative to the first pin hole 15g with a large holding force. Therefore, the positional accuracy and orientation of each connecting pin 51 relative to the motor housing 15 are stable. As a result, the assembly of the shaft support housing 3 and the compression housing 13 relative to the motor housing 15 can be performed accurately and easily, improving the assemblability of the housing 1.

[0125] Furthermore, the first abutting portion 51b of the connecting pin 51 has a groove 52 and a pair of protrusions 53. Therefore, the first abutting portion 51b can be easily formed by stamping.

[0126] Furthermore, in the connecting pin 51, three first abutment portions 51b are equally spaced in the circumferential direction of the outer peripheral surface 51a. Therefore, the first abutment portions 51b reliably abut against the inner peripheral surface of the second pin hole 3h of the shaft support housing 3, resulting in a highly reliable electrical connection between the shaft support housing 3 and the connecting pin 51. Additionally, the center of the circumscribed circle C of each first abutment portion 51b easily aligns with the center of the second pin hole 3h, improving the positioning accuracy when positioning the shaft support housing 3 relative to the motor housing 15.

[0127] (Example 2)

[0128] like Figure 8 As shown, in the compressor of Embodiment 2, the structure of the bolt 25 and the connecting pin 51 in the compressor of Embodiment 1 is changed.

[0129] In the compressor of Example 2, bolt 26 is made of resin and has insulating properties. Like bolt 25, bolt 26 has a head 26a, a shaft portion 26b, and an external thread portion 26c.

[0130] Furthermore, the connecting pin 55 in the compressor, like the connecting pin 51, is made of metal and has a cylindrical outer peripheral surface 55a with an outer diameter d. The connecting pin 55 has a press-in portion 551, a first insertion portion 552, and a second insertion portion 553, which are arranged in this order from one end in the length direction toward the other end.

[0131] The press-in portion 551 is formed in the region at one end of the connecting pin 55 in the length direction as a so-called straight portion extending along the length direction with a constant outer diameter d.

[0132] The first insertion portion 552 is formed in the central region of the connecting pin 55 along its length. Three first abutment portions 55b are formed on the outer peripheral surface 55a of the first insertion portion 552, protruding radially outward from the outer peripheral surface 55a. The three first abutment portions 55b are arranged at equal intervals of 120 degrees in the circumferential direction of the outer peripheral surface 55a.

[0133] The second insertion portion 553 is formed in the region at the other end of the connecting pin 55 along its length. Three second abutment portions 55c are formed on the outer peripheral surface 55a of the second insertion portion 553, protruding radially outward from the outer peripheral surface 55a. The three second abutment portions 55c are arranged at equal intervals of 120-degree pitch in the circumferential direction of the outer peripheral surface 55a.

[0134] Each first abutting portion 55b and each second abutting portion 55c, like the first abutting portion 51b in the compressor of Embodiment 1, has a groove and a pair of protrusions. The diameter D of the circumscribed circle C of each second abutting portion 55c is set to be equal to or less than the diameter D of the circumscribed circle C of each first abutting portion 55b.

[0135] In the motor housing 15, similar to the compressor of Embodiment 1, there are six internal threaded holes 15f for the external threaded portion 26c of the bolt 26 to be screwed in, and two first pin holes 15g for the press-in portion 551 of the connecting pin 55 to be pressed in.

[0136] Similar to the compressor in Embodiment 1, the shaft support housing 3 has a first bolt through hole 3g through which the shaft portion 26b of the bolt 26 passes, and two second pin holes 3h for each first abutment portion 55b in the first insertion portion 552 of the connecting pin 55 to abut. Each second pin hole 3h has a circular cross-section and an inner diameter equal to the diameter D of the circumcircle C of each first abutment portion 55b of the first insertion portion 552. Thus, the first insertion portion 552 and the second insertion portion 553 can be inserted and removed relative to the second pin holes 3h.

[0137] Similar to the compressor in Embodiment 1, the compression housing 13 has a second bolt through hole 13g through which the shaft portion 26b of the bolt 26 passes, and two third pin holes 13h for the second abutment portions 55c of the second insertion portion 553 of the connecting pin 55 to abut against each other. Each third pin hole 13h has a circular cross-section and an inner diameter equal to the diameter D of the circumcircle C of each second abutment portion 55c of the second insertion portion 553. Thus, the second insertion portion 553 can be inserted and removed relative to the third pin holes 13h.

[0138] In the compressor of Embodiment 2, the bolts 26 that fasten the motor housing 15 to the compressor housing 13 are insulated. Therefore, the motor housing 15 and the compressor housing 13 cannot be electrically connected by the bolts 26.

[0139] In this respect, in this compressor, each second abutment portion 55c of the second insertion portion 553 of the connecting pin 55 abuts against the inner peripheral surface of each third pin hole 13h of the compression housing 13. Furthermore, similar to the connecting pin 51 in the compressor of Embodiment 1, the press-in portion 551 of the connecting pin 55 is pressed into the first pin hole 15g of the motor housing 15, and each first abutment portion 55b of the first insertion portion 552 of the connecting pin 55 abuts against the inner peripheral surface of the second pin hole 3h of the shaft support housing 3. Thus, the motor housing 15, the shaft support housing 3, and the compression housing 13 are electrically connected by means of the connecting pin 55.

[0140] Furthermore, the inner diameter of the second pin hole 3h of the shaft support housing 3 is equal to the diameter D of the circumscribed circle C of each first abutment portion 55b of the connecting pin 55, and is equal to or greater than the diameter D of the circumscribed circle C of each second abutment portion 55c of the connecting pin 55. Therefore, the first insertion portion 552 and the second insertion portion 553 of the connecting pin 55 can be inserted and removed relative to the second pin hole 3h of the shaft support housing 3.

[0141] Furthermore, the inner diameter of the third pin hole 13h of the compression housing 13 is the same as the diameter D of the circumscribed circle C of each second abutment portion 55c of the connecting pin 55. Therefore, the second insertion portion 553 of the connecting pin 55 can be inserted and removed relative to the third pin hole 13h of the compression housing 13.

[0142] Therefore, the shaft support housing 3 and the compression housing 13 can be easily removed relative to the motor housing 15.

[0143] The other structures and effects of the compressor in Example 2 are the same as those in Example 1.

[0144] The present invention has been described above in conjunction with embodiments 1 and 2, but the present invention is not limited to the above embodiments 1 and 2, and can of course be applied by appropriate modifications without departing from its spirit.

[0145] In the compressors of Embodiments 1 and 2, the diameter of the outer circle of the first abutment portion is set to be equal to the inner diameter of the second pin hole, or the diameter of the outer circle of the second abutment portion is set to be equal to the inner diameter of the third pin hole, but the present invention is not limited to this. For example, the diameter of the outer circle of the first abutment portion (or the second abutment portion) may be approximately equal to the inner diameter of the second pin hole (or the third pin hole), and the first abutment portion (or the second abutment portion) may be weakly pressed into the second pin hole (or the third pin hole) with a small amount of pressing that does not obstruct insertion or removal.

[0146] In the compressors of Embodiments 1 and 2, the first housing portion is configured as the motor housing 15, the second housing portion as the shaft support housing 3, and the third housing portion as the compression housing 13. However, the present invention is not limited to this. As long as the housing is used to house the compression mechanism and the motor mechanism, the number and type of the first housing portion, the second housing portion, and the third housing portion constituting the housing are not particularly limited.

[0147] For example, the first housing part can be configured as the compression housing 13, the second housing part as the shaft support housing 3, and the third housing part as the motor housing 15.

[0148] Alternatively, the present invention can also be applied to compressors without a third housing portion, where the housing includes a motor housing 15, a compressor housing 13, and a first gasket 61 sandwiched between the motor housing 15 and the compressor housing 13, and the motor housing 15 and the compressor housing 13 are fastened together by an insulating fastening connection member. In this case, a connecting pin is used, consisting of a press-in portion formed at one end in the longitudinal direction and a first insertion portion formed at the other end in the longitudinal direction and having a first abutment portion. The press-in portion is pressed into the first pin hole 15g of the motor housing 15, and the first insertion portion is inserted in a pluggable manner while the first abutment portion abuts against the third pin hole 13h of the compressor housing 13.

[0149] Furthermore, the present invention can also be applied to a compressor with a fourth metal housing portion provided, which is sandwiched between the compressor housing 13 and the compressor of Embodiment 2. In this case, a third bolt through hole is provided through the fourth housing portion for the shaft portion 25b of the metal bolt 25 to pass through, and the fourth housing portion is fastened to the motor housing 15 with the metal bolt 25 instead of the insulating bolt 26, thereby making the fourth housing portion and the motor housing 15 equipotential.

[0150] In the compressors of Embodiment 1 and Embodiment 2, the number of connecting pins 51 and 55 is set to two, but the present invention is not limited to this, and the number of connecting pins can be one or more than three.

[0151] In the compressors of Embodiments 1 and 2, the first abutting portion and the second abutting portion are shaped with a groove 52 and a pair of protrusions 53, but are not limited thereto. The shape of the first abutting portion and the second abutting portion can be such that it protrudes radially outward from the outer peripheral surface of the first abutting portion and the second abutting portion and can abut against the inner peripheral surface of the second pin hole and the third pin hole. For example, the first abutting portion and the second abutting portion can also be formed by a simple protrusion without a groove.

[0152] In the compressors of Embodiments 1 and 2, the number of the first abutting part and the second abutting part is set to 3, but the number of the first abutting part and the second abutting part is not particularly limited, and can be one, two, or more than four.

[0153] In the compressors of Embodiments 1 and 2, a scroll type is used as the compression mechanism, but other types of compression mechanisms such as airfoil type and swashplate type can also be used.

[0154] The following technical concepts can also be grasped from this manual.

[0155] (Postscript 1)

[0156] An electric compressor, which houses a compression mechanism and a motor mechanism within a housing.

[0157] The electric compressor is characterized in that...

[0158] The housing includes:

[0159] A first housing portion made of metal, having a first mating surface and a first pin hole formed on the first mating surface;

[0160] A second housing portion made of metal has a second mating surface facing the first mating surface and a second pin hole formed on the second mating surface at a position opposite to the first pin hole.

[0161] A metal connecting pin has a press-in portion that is pressed into a first pin hole and a first abutting portion that protrudes from its outer peripheral surface and abuts against the inner peripheral surface of a second pin hole, and is insertable into the second pin hole; and

[0162] An insulating first gasket is sandwiched between the first mating surface and the second mating surface and has a first pin through hole through which the connecting pin passes.

[0163] (Postscript 2)

[0164] According to the electric compressor described in Appendix 1, wherein,

[0165] The second pin hole passes through the second housing portion.

[0166] The second housing portion has a third mating surface facing the side opposite to the second mating surface.

[0167] The housing also includes:

[0168] A third housing portion made of metal has a fourth mating surface opposite to the third mating surface and a third pin hole formed on the fourth mating surface at a position opposite to the second pin hole.

[0169] An insulating second gasket, sandwiched between the third and fourth mating surfaces, and having a second pin through hole for the connecting pin to pass through; and

[0170] A metal fastening connection component that clamps the second housing portion in the middle, thereby fastening and connecting the first housing portion and the third housing portion.

[0171] The connecting pin also has a second insertion portion disposed on the side opposite to the push-in portion relative to the first insertion portion in the length direction of the connecting pin.

[0172] The outer diameter of the second insertion part is smaller than the inner diameter of the third pin hole.

[0173] (Note 3)

[0174] According to the electric compressor described in Appendix 1, wherein,

[0175] The second pin hole passes through the second housing portion.

[0176] The second housing portion has a third mating surface facing the side opposite to the second mating surface.

[0177] The housing also includes:

[0178] A third metal housing portion having a fourth mating surface opposite the third mating surface and a third pin hole formed on the fourth mating surface at a position opposite to the second pin hole; and

[0179] An insulating second gasket, sandwiched between the third and fourth mating surfaces, has a second pin through hole through which the connecting pin passes.

[0180] The connecting pin also has a second insertion portion disposed on the side opposite to the push-in portion relative to the first insertion portion in the length direction of the connecting pin.

[0181] The second insertion portion has a second abutting portion that protrudes from the outer peripheral surface of the second insertion portion and abuts against the inner peripheral surface of the third pin hole, and can be inserted into and removed relative to the third pin hole.

[0182] (Postscript 4)

[0183] The electric compressor according to any one of Appendices 1 to 3, wherein,

[0184] The first abutting portion has a groove recessed on the outer peripheral surface of the connecting pin and a pair of protrusions protruding on the outer peripheral surface and sandwiching the groove, arranged side by side in the circumferential direction of the connecting pin.

[0185] (Note 5)

[0186] The electric compressor according to any one of Appendices 1 to 4, wherein,

[0187] There are multiple first contact parts.

[0188] (Note 6)

[0189] According to the electric compressor described in Appendix 5, wherein,

[0190] The plurality of first abutment portions are arranged at equal intervals in the circumferential direction of the connecting pin.

[0191] Industrial applicability

[0192] This invention can be applied to air conditioning devices in vehicles and the like.

Claims

1. An electric compressor, comprising a compression mechanism and a motor mechanism housed within a casing. The electric compressor is characterized in that... The housing includes: A first housing portion made of metal, having a first mating surface and a first pin hole formed on the first mating surface; A second housing portion made of metal has a second mating surface facing the first mating surface and a second pin hole formed on the second mating surface at a position opposite to the first pin hole. A connecting pin, which is a metal connecting pin with a cylindrical outer peripheral surface, has a press-in portion disposed at one end of the connecting pin and pressed into a first pin hole, and a first insertion portion disposed at a position on the connecting pin further from the press-in portion than the other end side, having a first abutment portion that protrudes radially outward from the outer peripheral surface and abuts against the inner peripheral surface of the second pin hole by being insertable and detachable relative to the second pin hole; and An insulating first gasket, sandwiched between the first mating surface and the second mating surface, has a first pin through hole through which the connecting pin passes. The diameter of the circumscribed circle that connects to the front end protrusion of the first abutment portion is larger than the diameter of the press-in portion. The diameter of the second pin hole is larger than the diameter of the first pin hole.

2. The electric compressor according to claim 1, wherein, The second pin hole passes through the second housing portion. The second housing portion has a third mating surface facing the side opposite to the second mating surface. The housing also includes: A third housing portion made of metal has a fourth mating surface opposite to the third mating surface and a third pin hole formed on the fourth mating surface at a position opposite to the second pin hole. An insulating second gasket is sandwiched between the third mating surface and the fourth mating surface, and has a second pin through hole through which the connecting pin passes; as well as A metal fastening connection component that clamps the second housing portion in the middle, thereby fastening and connecting the first housing portion and the third housing portion. The connecting pin also has a second insertion portion disposed on the side opposite to the push-in portion relative to the first insertion portion in the length direction of the connecting pin. The outer diameter of the second insertion part is smaller than the inner diameter of the third pin hole.

3. The electric compressor according to claim 1 or 2, wherein, The first abutting portion has a groove recessed on the outer peripheral surface of the connecting pin and a pair of protrusions protruding on the outer peripheral surface and sandwiching the groove, arranged side by side in the circumferential direction of the connecting pin.

4. The electric compressor according to claim 1 or 2, wherein, There are multiple first contact parts.

5. The electric compressor according to claim 4, wherein, The plurality of first abutment portions are arranged at equal intervals in the circumferential direction of the connecting pin.

6. The electric compressor according to claim 1, wherein, The second pin hole passes through the second housing portion. The second housing portion has a third mating surface facing the side opposite to the second mating surface. The housing also includes: A third housing portion made of metal has a fourth mating surface opposite to the third mating surface and a third pin hole formed on the fourth mating surface at a position opposite to the second pin hole. as well as An insulating second gasket, sandwiched between the third and fourth mating surfaces, has a second pin through hole through which the connecting pin passes. The connecting pin also has a second insertion portion disposed on the side opposite to the push-in portion relative to the first insertion portion in the length direction of the connecting pin. The second insertion portion has a second abutting portion that protrudes from the outer peripheral surface of the second insertion portion and abuts against the inner peripheral surface of the third pin hole, and can be inserted into and removed relative to the third pin hole.

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