Electric compressor

Abstract

The technical problem to be solved by the invention is to improve the electrical insulation between an insulating component and a line concentration bar. An electric compressor (10) is provided with a seal joint (130), and the seal joint (130) is provided with: a joint plate (131) fixed to a housing (20); a tab pin (132) that is inserted through the through-hole (131a) of the tab plate (131) and electrically connects a connection terminal (106) to the outside of the housing (20); an insulating member (140) that seals and insulates between the tab plate (131) and the tab pin (132); the connector pin (132) is covered in a liquid-tight manner by a ring-shaped insulating tube (150) having elasticity and electrical insulating properties, and the insulating tube (150) is provided with low-rigidity parts (160, 160) having lower rigidity than a central part (470) at both ends in the axial direction, and is sandwiched between the hub row (110) and the insulating member (140).

Description

Technical Field

[0001] The present invention relates to an improved technology for an electric compressor including a compression mechanism for compressing a refrigerant and an electric motor for driving the compression mechanism. Background Art

[0002] In an electric compressor, a motor is housed in a sealed housing, and a control unit (motor drive circuit such as an inverter) for controlling the drive of the motor is provided outside the housing. The compression mechanism compresses and discharges the refrigerant sucked into the housing.

[0003] For example, in an electric compressor, the stator of the motor is fixed inside a housing, and a control circuit chamber is provided in the housing through a partition wall. A sealing joint is arranged on the partition wall. The sealing joint has an insulating component filled between a joint plate and a joint pin. A wire collection row is arranged between the partition wall and the stator. The connection terminal electrically connected to the stator is accommodated in the wire collection row. The joint pin is embedded in the wire collection row and electrically connected to the connection terminal.

[0004] The connector pins between the insulating component and the busbar are inevitably exposed to the refrigerant in the housing. If the connector pins come into contact with the liquid refrigerant (liquid refrigerant) or lubricating oil, there is a concern that a short circuit between the connector pins and the connector plate, and then a short circuit between the connector plate and the housing, may occur, so countermeasures need to be taken. As countermeasures, for example, the technologies of Patent Documents 1 and 2 are known.

[0005] According to the technology known in Patent Document 1, an annular insulator is embedded in the pin (equivalent to the connector pin) assembled on the sealing plate (equivalent to the connector plate), an annular sealing component is embedded in the outer peripheral surface of the insulator, and the outer peripheral surface of the sealing component is embedded in the embedding port of the connector housing (equivalent to the cable collection bar). That is, the technology of Patent Document 1 performs radial sealing through the inner peripheral surface and the outer peripheral surface of the sealing component.

[0006] In addition, according to the technology known in Patent Document 2, the terminal pins (equivalent to the connector pins) assembled on the glass terminal plate (equivalent to the connector plate) are embedded in the terminals of the internal power lines housed in the terminal shell (equivalent to the wire collection bar), and a cylindrical rubber ring is clamped between the glass terminal plate and the terminal shell. That is, the technology of Patent Document 2 is a technology that uses the two end surfaces of the rubber ring to perform axial sealing between the glass terminal plate and the terminal shell.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: (Japanese) Patent Publication No. 2013-148037

[0010] Patent Document 2: (Japanese) Patent Publication No. 2014-114795 Summary of the invention

[0011] Technical problem to be solved by the invention

[0012] However, in the electric compressor known in Patent Document 1, the inner circumference of the annular sealing component is first embedded in the outer circumference of the insulator (first press-in), and then the inner circumference of the insertion port of the connector housing is embedded in the outer circumference of the sealing component (second press-in). That is, the annular sealing component needs to ensure the sealing of both the inner circumference and the outer circumference. For this purpose, it is necessary to set both the embedded state of the inner circumference side and the embedded state of the outer circumference side in a balanced manner. Considering the maintenance of the quality of the sealing component (such as material or dimensional tolerance) and the balance between the tolerance of the inner circumference side and the tolerance of the outer circumference side, there is a problem in ensuring electrical insulation.

[0013] In addition, in the electric compressor known in Patent Document 2, since a cylindrical rubber ring (seal in the axial direction) is clamped between a glass terminal plate and a terminal housing, the tolerance of the axial separation distance from the glass terminal plate to the terminal housing affects the sealing performance. The tolerance of the axial separation distance depends on the combination of the tolerances of each component, and inevitably becomes larger. In addition, the technology of Patent Document 2 is a structure that utilizes the contact area between the sealing surface of the glass terminal plate and the sealing surface of the terminal housing to ensure the insulation distance. Therefore, when the flatness or parallelism of the sealing surface is poor, the contact area becomes narrower, and there are problems in ensuring electrical insulation.

[0014] The present invention is made to solve the above-mentioned problems, and the technical problem to be solved is to provide a technology that can improve the electrical insulation between the insulating member and the busbar.

[0015] Technical solutions for solving technical problems

[0016] In the following description, in order to facilitate understanding of the present invention, reference numerals in the drawings are indicated by parentheses, but the present invention is not limited to the embodiments shown in the drawings.

[0017] According to the present invention, first, an electric compressor is provided.

[0018] The electric compressor (10; 200; 300; 400) comprises:

[0019] A sealed housing (20);

[0020] a compression mechanism (50) for compressing and discharging the refrigerant sucked into the shell (20);

[0021] an electric motor (100) housed in the housing (20) in a manner to drive the compression mechanism (50);

[0022] A cable hub (110) which receives connection terminals (106) electrically connected to the motor (100) and is received in the housing (20);

[0023] A sealing joint (130) is disposed on the housing (20) and is electrically connected to the connection terminal (106).

[0024] The sealing joint (130) comprises:

[0025] A connector plate (131) fixed to the housing (20);

[0026] A connector pin (132) inserted through a through hole (131a) of the connector plate (131) to electrically connect the connection terminal (106) to the outside of the housing (20);

[0027] An insulating component (140) is filled between the connector plate (131) and the connector pin (132) to perform sealing and insulation;

[0028] The electric compressor (10; 200; 300; 400) is characterized in that:

[0029] The connector pin (132) is covered liquid-tightly by an annular insulating tube (150; 350; 450) having elasticity and electrical insulation.

[0030] The insulating tube (150; 350; 450) has low-rigidity parts (160, 160; 360, 360) at both axial ends, which are lower in rigidity than the axial center part (170; 470) of the insulating tube (150; 350; 450), and is sandwiched between the cluster bar (110) and the insulating component (140).

[0031] Second, preferably, in the electric compressor described in the first aspect, each of the low-rigidity portions (160, 160; 360, 360) has a contraction portion (161, 161) having a gap (Cr) between the outer peripheral surface (132a) of the connector pin (132) and the inner peripheral surface (150a) of the insulating tube (150).

[0032] Thirdly, in the second described electric compressor, preferably, a support portion (170; 470) is provided between each of the low-rigidity portions (160, 160; 360, 360), and a hole diameter (d1) of the support portion (170; 470) is smaller than a diameter (d2) of the connector pin (132).

[0033] Fourth, preferably, in the electric compressors described in the second to third embodiments, for the front ends (163, 163) of the respective low-rigidity portions (160, 160; 360, 360), the inner corners (167, 167) formed by the front end faces (165, 165) and the inner peripheral faces (166, 166), and the outer corners (169, 169) formed by the front end faces (165, 165) and the outer peripheral faces (168, 168) are formed into curved surfaces, and the curved surfaces (167a, 167a) of the inner corners (167, 167) have a larger radius of curvature (r1) than the curved surfaces (169a, 169a) of the outer corners (169, 169).

[0034] Fifthly, in the electric compressor described in the second to fourth aspects, each of the low rigidity portions (160, 160; 360, 360) is preferably composed of an enlarged diameter portion (164, 164) whose diameter increases from the base end (162, 162) toward the front end (163, 163).

[0035] Sixthly, in the electric compressor described in any one of the second to fifth aspects, the wall thickness (t1, t2) of the insulating tube (150) is preferably the same over the entire length.

[0036] Seventh, preferably in the electric compressor described in the second to sixth descriptions, the cluster bar (110) has a tube contact surface (212) that contacts the front end surface (165) of any one of the low-rigidity portions (160, 160; 360, 360) provided at both axial ends of the insulating tube (150), and the tube contact surface (212) is a spherical surface or a conical surface.

[0037] Eighth, preferably in the electric compressor described in the second to seventh descriptions, the insulating component (140) has a tube contact surface (242c) that contacts the front end surface (165) of any one of the low-rigidity portions (160, 160; 360, 360) provided at both axial ends of the insulating tube (150), and the tube contact surface (242c) is a spherical surface or a conical surface.

[0038] Ninth, preferably in the electric compressor described in second to eighth, the insulating tube (350) is constructed as a corrugated shape in which at least a part or all of any one or both of the low-rigidity parts (360, 360) provided at both axial ends can shrink in the axial direction of the insulating tube (350).

[0039] Tenth, in the electric compressor described in any one of the third to eighth aspects, at least a portion of the support portion (470) preferably includes a gripping portion (471) that is thickened toward the radially outer side of the support portion (470).

[0040] Effects of the Invention

[0041] In the present invention, it is possible to improve the electrical insulation between the insulating member and the busbar. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a cross-sectional view of the electric compressor of Example 1.

[0043] Figure 2 yes Figure 1 A magnified view of the area surrounding the hub is shown.

[0044] Figure 3 yes Figure 2 An exploded perspective view of the cable hub and sealing connector is shown.

[0045] Figure 4 yes Figure 2 An enlarged cross-sectional view of the sealing joint is shown.

[0046] Figure 5A yes Figure 2 An enlarged view of the sealing joint around the insulating tube is shown. Figure 5B yes Figure 5A An enlarged view of the relationship between the insulator and the insulating tube is shown. Figure 5C yes Figure 5B Schematic diagram of the elastic deformation of the insulating tube toward the radial inside.

[0047] Figure 6 yes Figure 5A A cross-sectional view of an insulating tube monomer is shown.

[0048] Figure 7 yes Figure 6 A cross-sectional view of a modified example of the insulating tube shown.

[0049] Fig. 8A This is a first example diagram of the insulating tube surrounding the sealing joint of the electric compressor of Example 2. Figure 8B This is a second example diagram of the insulating tube and its surroundings of the sealing joint of the electric compressor of the second embodiment.

[0050] Fig.9A is a cross-sectional view around the insulating tube of the sealing joint of the electric compressor of Example 3, Fig. 9B 9A is a cross-sectional view of the insulating tube alone.

[0051] Fig. 10A is a cross-sectional view of an insulating tube of an electric compressor of Example 4, Fig. 10B is along Fig. 10A A cross-sectional view of line 10B-10B. DETAILED DESCRIPTION

[0052] Hereinafter, an embodiment of the present invention will be described based on the drawings. It should be noted that the form shown in the drawings is an example of the present invention, and the present invention is not limited to this form.

[0053] <Example 1>

[0054] Reference Figure 1 to Figure 7 The electric compressor 10 according to the first embodiment will be described.

[0055] like Figure 1 As shown, the electric compressor 10 is suitable for use in a refrigeration cycle using a refrigerant as a working fluid, for example, in a refrigeration cycle of an automobile air conditioner. It should be noted that the use of the electric compressor 10 is not limited.

[0056] The electric compressor 10 includes, for example, a sealed housing 20 that can be horizontally arranged, a compressor 50 that compresses and discharges the refrigerant sucked into the housing 20, an electric motor 100 housed in the housing 20 to drive the compression mechanism 50, and a control unit 120 that controls the drive of the electric motor 100. The control unit 120 is composed of, for example, an inverter device that receives input of power supplied from the outside and a compressor operation signal that operates the electric compressor 10, and supplies driving power to the electric motor 100.

[0057] The housing 20 is a bottomed cylindrical member composed of a bottom wall 21 and a peripheral wall 22, one end of which is closed by the bottom wall 21 and the other end is fully open. That is, an opening 23 is provided at the other end of the housing 20. The opening 23 is closed by a head member 31 that can be opened and closed. The housing 20 is composed of a casting made of a metal material such as aluminum (including aluminum alloy).

[0058] The outer wall surface 21a and the inner wall surface 21b of the bottom wall 21 of the housing 20 are flat surfaces. A bottomed cylindrical control housing 32 is assembled on the outer wall surface 21a. That is, the bottom wall 32a of the control housing 32 overlaps with the outer wall surface 21a of the bottom wall 21 of the housing 20, and is fastened to the bottom wall 21 by a fastening member (not shown). The control unit 120 is accommodated in the control housing 32. The opening 32b of the control housing 32 is closed by a cover 33 that can be opened and closed. The details of the control unit 120 will be described later.

[0059] The housing 20 has a first storage chamber 24 on the bottom wall 21 side and a second storage chamber 25 on the opening 23 side. The first and second storage chambers 24 and 25 are continuous in the longitudinal direction of the housing 20 (axial direction).

[0060] At least a part (for example, the whole) of the compression mechanism 50 is accommodated in the second accommodation chamber 25 on the opening 23 side of the housing 20. The motor 100 is accommodated in the first accommodation chamber 24 on the bottom wall 21 side of the housing 20.

[0061] In addition, the housing 20 has a suction passage 26 for sucking refrigerant from the outside into the first storage chamber 24. The head component 31 has an oil separation chamber 31a for separating oil from the refrigerant compressed by the compression mechanism 50, and a discharge port (not shown) for discharging the gaseous refrigerant after the oil is separated by the oil separation chamber 31a to the outside.

[0062] The first storage chamber 24 and the second storage chamber 25 are separated by a disc-shaped partition member 34 (also referred to as a drive shaft support member 34). The partition member 34 is restricted from both relative rotation and relative movement in the axial direction relative to the housing 20. It should be noted that the drive shaft support member 34 is fixed to the housing 20 after the motor 100 is housed in the housing 20.

[0063] There is a case where the first storage chamber 24 is renamed as the "low-pressure chamber 24". The partition member 34 has a plurality of suction holes 34a that connect the first storage chamber 24 and the second storage chamber 25. The partition member 34 can be considered as an element constituting the compression mechanism 50. Even if the partition wall 34 is considered to be a part of the compression mechanism 50, it does not deviate from the main purpose of the present invention.

[0064] The first storage chamber 24 is provided with a drive shaft 41 located on the center line CL1 in the longitudinal direction of the housing 20. The drive shaft 41 also serves as the output shaft 101 (motor shaft 101) of the motor 100. The center line CL1 in the longitudinal direction of the housing 20 may be referred to as "the center line CL1 of the drive shaft 41 (output shaft 101)".

[0065] The drive shaft 41 passes through the partition member 34 toward the compression mechanism 50, and is supported to be rotatable by a first bearing 42 provided on the partition member 34 and a second bearing 43 provided on the bearing retaining portion 21c of the bottom wall 21 of the housing 20. In addition, the drive shaft 41 has an eccentric shaft 44 at one end surface that passes through the partition member 34. The eccentric shaft 44 extends from one end surface of the drive shaft 41 toward the compression mechanism 50 and is parallel to the drive shaft 41. The center line CL2 of the eccentric shaft 44 is offset relative to the center line CL1 of the drive shaft 41. An annular bushing 45 is rotatably fitted in the eccentric shaft 44. A counterweight 46 protruding in the radial direction is integrally provided in the bushing 45. The inner circumferential surface of the third bearing 47 is fitted in the outer circumferential surface of the bushing 45.

[0066] Next, the compression mechanism 50 will be described.

[0067] like Figure 1As shown, the compression mechanism 50 is, for example, composed of a so-called scroll compression mechanism, which compresses the refrigerant by combining a fixed scroll member 60 supported between the head component 31 and the partition component 34 in a manner that is non-rotatable relative to each other and a swinging scroll member 70 that can swing circumferentially relative to the fixed scroll member 60.

[0068] The fixed scroll 60 has a circular plate-shaped fixed end plate 61, a cylindrical outer peripheral wall 62, and a spiral fixed scroll wall 63. The fixed end plate 61 is orthogonal to the center line CL2 of the eccentric shaft 44. The outer peripheral wall 62 extends from the outer peripheral edge of the fixed end plate 61 toward the motor 100. A refrigerant suction port 64 for sucking refrigerant from the radial outer side to the inner side is formed in the outer peripheral wall 62. The fixed scroll wall 63 is located on the inner side of the outer peripheral wall 62 and is erected from the bottom surface of the fixed end plate 61.

[0069] The swing scroll 70 is capable of orbiting relative to the fixed scroll 60 . The swing scroll 70 includes a disc-shaped swing end plate 71 located at a position facing the fixed scroll wall 63 and a spiral swing scroll wall 72 .

[0070] The swing mirror plate 71 is located on the inner side of the outer peripheral wall 62 of the fixed scroll 60, and is supported by the eccentric shaft 44 to be rotatable via the third bearing 47 and the bushing 45. The swing scroll wall 72 is erected from the swing end plate 71 toward the fixed scroll wall 63, and a plurality of compression chambers 73 are formed by combining the swing scroll wall 72 and the fixed scroll wall 63. By rotating the drive shaft 41, the swing scroll 70 can revolve (eccentrically rotate) around the axis CL1 of the drive shaft 41.

[0071] In addition, the compression mechanism 50 has an anti-rotation mechanism 80. The anti-rotation mechanism 80 is composed of a plurality of recessed portions 81 provided on the swing end plate 71, a plurality of ring members 82 fitted with the recessed portions 81, and a plurality of anti-rotation pins 83 extending from the partition member 34 to the inside of the plurality of ring members 82. The ring members 82 and the anti-rotation pins 83 are in line contact with each other, so that the self-rotation of the swing scroll 70 can be prevented and the swinging is allowed.

[0072] As described above, the swing scroll 70 revolves by the rotation of the drive shaft 41. As a result, the refrigerant sucked from the suction passage 26 passes through the gap of the motor 100 in the low-pressure chamber 24, through the suction hole 34a of the partition member 34, and enters the compression chamber 73 through the refrigerant suction port 64 of the fixed scroll 60. As the swing scroll 70 revolves, the compression chamber 73 moves toward the center while gradually reducing the internal volume. As a result, the refrigerant in the compression chamber 73 is compressed. When the pressure in the compression chamber 73 rises to a level that exceeds the valve opening pressure of the discharge valve 91, the discharge valve 91 opens due to the pressure difference. The refrigerant in the compression chamber 73 flows into the discharge chamber 93 through the discharge hole 92. The refrigerant in the discharge chamber 93 is discharged to the outside from the discharge port (not shown) via the oil separation chamber 31a.

[0073] Next, the electric motor 100 will be described.

[0074] like Figure 1 As shown, the motor 100 is, for example, a three-phase AC brushless motor and includes: the output shaft 101 (drive shaft 41 ); a rotor 102 fixed to the output shaft 101 ; and a cylindrical stator 103 surrounding the rotor 102 .

[0075] The rotor 102 is rotatable about the center line CL1 of the output shaft 101 with the longitudinal direction of the housing 20 as the axis center (rotation center). The stator 103 is arranged radially outside the rotor 102 and fixed to the inner peripheral surface 20a of the housing 20 (the inner peripheral surface 24a of the first storage chamber 24).

[0076] Next, the electrical connection structure between the motor 100 and the control unit 120 will be described.

[0077] like Figure 2 and Figure 3 As shown, a plurality of lead wires 105 (motor wiring 105) led out from the coil 104 of the stator 103 extend toward the control unit 120 side and are individually connected to a plurality of connection terminals 106 (sockets 106). That is, these connection terminals 106 are electrically connected to the coil 104 of the motor 100 and are arranged on the bottom wall 21 side relative to the motor 100. Each connection terminal 106 is assembled (stored) in a wire collection bar 110. The wire collection bar 110 is also called an electrical connector 110.

[0078] The cable collector 110 is inserted into the space Sp between the bottom wall 21 of the housing 20 and the insulator 107 of the stator 103, that is, the space Sp between the bottom wall 21 and the stator 103, and is located at a gap ga (gap ga) away from the bottom wall 21. The cable collector 110 is restricted from moving in a direction parallel to the bottom wall 21 of the housing 20 (a plane direction orthogonal to the center line CL1 of the output shaft 101), and the movement in the longitudinal direction of the housing 20 is restricted by the insulator 107. In this way, the cable collector 110 is accommodated in the housing 20.

[0079] The cluster bar 110 is composed of a molded part such as an electrically insulating resin having a terminal housing portion 111 for housing each connection terminal 106. More specifically, the cluster bar 110 has a flat opposing surface 112 opposing the bottom wall 21 of the housing 20. The opposing surface 112 is a plane perpendicular to the center line CL1 of the output shaft 101. There is a case where the opposing surface 112 (the surface 112 opposing the connector plate 131) is renamed as the "tube contact surface 112 of the cluster bar 110".

[0080] A plurality of pin insertion holes 113 penetrating the terminal receiving portion 111 are formed on the tube contact surface 112. The positions of the plurality of pin insertion holes 113 correspond to the positions of the connection portions 106a of the connection terminals 106.

[0081] Each connection terminal 106 accommodated in the cluster bar 110 is electrically connected to the outside of the housing 20 via a sealing joint 130. For example, a control unit 120 is disposed outside the housing 20 (eg, inside the control housing 32). Each connection terminal 106 is electrically connected to the control unit 120 via a sealing joint 130.

[0082] The control unit 120 includes a structure that is directly or indirectly provided on the outer wall surface 21a of the bottom wall 21 of the housing 20. For example, the control unit 120 is indirectly provided on the outer wall surface 21a of the bottom wall 21 of the housing 20 by being removably housed in the control housing 32. For another example, the control unit 120 is directly provided on the outer wall surface 21a of the bottom wall 21 of the housing 20 without passing through the bottom wall 32a of the control housing 32. The control unit 120 includes a substrate 122 on which a control component 121 such as an inverter circuit is mounted, and a substrate-side connector 123 provided on the substrate 122. The substrate-side connector 123 can be connected to the front end of each connector pin 132 of the sealing connector 130.

[0083] By assembling the control unit 120 in the control case 32, the board-side connector 123 is connected to each connector pin 132. As a result, each lead wire 105 is electrically connected to the control unit 120. The control unit 120 can supply driving power to the motor 100.

[0084] Next, the sealing joint 130 will be described.

[0085] like Figure 2 and Figure 3 As shown, the sealing joint 130 (relay joint 130 ) is provided in the housing 20 and is electrically connected to the connection terminal 106 .

[0086] The sealing joint 130 includes a joint plate 131 attachable to the housing 20 and a plurality of joint pins 132 assembled to the joint plate 131. The sealing joint 130 also includes a plurality of insulating members 140 filled between the joint plate 131 and the joint pins 132 to provide sealing (airtightness, liquidtightness) and electrical insulation.

[0087] The joint plate 131 (base 131) is a flat plate-shaped member that can be attached to the bottom wall 21 from the outer wall surface 21a side by a fastening member 133. The space between the joint plate 131 and the outer wall surface 21a of the bottom wall 21 is sealed by a sealing member 134.

[0088] The plurality of connector pins 132 are conductive round rod-shaped members extending from the control housing 32 into the housing 20 along the center line CL1 of the output shaft 101. The bottom wall 21 of the housing 20 has through holes 21d (see FIG. 21 ) through which the plurality of connector pins 132 and the plurality of insulating tubes 150 can be inserted. Figure 2 ).

[0089] The front end (one end face) of each connector pin 132 can be detachably embedded in the connection terminal 123a of the substrate-side connector 123, thereby being electrically connected to the substrate-side connector 123. In addition, by detachably embedding the connector pin 132 in the connection portion 106a of the connection terminal 106, the sealed connector 130 can electrically connect the stator 103 and the control unit 120. In this way, each connector pin 132 can electrically connect the connection terminal 106 to the outside of the housing 20. The connection portion 106a of the connector pin 132 and the connection terminal 106 is covered by the hub 110.

[0090] like Figure 4 As shown, each connector pin 132 is inserted through the through hole 131a of the connector plate 131. The insulating component 140 seals (airtight, liquidtight) and electrically insulates each connector pin 132 that passes through the through hole 131a from the connector plate 131 individually or as a whole, and is composed of a single component or a plurality of components. For example, the insulating component 140 is composed of a filling material 141 filled in the through hole 131a of the connector plate 131 and a pair of closing components 142, 143 that close the filling material 141 from both sides of the through hole 131a.

[0091] The filling material 141 is made of a material having sealing properties (air tightness, liquid tightness) and electrical insulation properties and capable of supporting the tab pins 132. An example of the filling material 141 is an inorganic substance having electrical insulation properties such as glass.

[0092] The pair of closing components 142 and 143 are made of an electrically insulating material such as ceramic. These closing components 142 and 143 are annular components having insertion holes 142a and 143a through which the connector pin 132 can be inserted, and have flanges 142b and 143b at one end in the axial direction. One of the pair of closing components 142 and 143 is called a first closing component 142, and the other is called a second closing component 143.

[0093] The first sealing member 142 is located in the low pressure chamber 24 (see FIG. Figure 2 ) side, and has an opposing surface 142c that is opposite to the opposing surface 112 (tube contact surface 112) of the cable hub 110. The opposing surface 142c is preferably a flat surface parallel to the tube contact surface 112 of the cable hub 110. The second sealing member 143 is located at the control unit 120 (refer to FIG. 1 ) relative to the connector plate 131. Figure 2 )side.

[0094] There is a situation where the opposing surface 142c ( Figure 2 The surface 142c) shown opposite to the tube contact surface 112 of the cluster bar 110 is referred to as "the tube contact surface 142c of the first closing member 142" or "the tube contact surface 142c of the insulating member 140".

[0095] The above-mentioned filling material 141 integrates the connector pin 132 and the closing parts 142 and 143 relative to the connector plate 131, for example, as described below. Glass particles are filled between the through hole 131a of the connector plate 131 and the connector pin 132, and the two sides of the through hole 131a are closed by the closing parts 142 and 143, and the entire sealed joint 130 is fired. As a result, the glass particles melt and adhere tightly to the inner circumference of the through hole 131a, the connector pin 132, and the closing parts 142 and 143. The molten glass particles form the filling material 141 by solidification. As a result, the filling material 141 seals the inner circumference of the through hole 131a, the connector pin 132, and the closing parts 142 and 143, and positions and fixes (integrates) the connector pin 132 and the closing parts 142 and 143 relative to the connector plate 131.

[0096] When filled with glass particles, there is a tiny gap in the through hole 131a. The gap disappears by melting the filled glass particles. In order to cope with this situation, the glass particles filled in the through hole 131a are compressed and melted by a pair of sealing parts 142 and 143. Therefore, a compression amount is required to compress the glass particles. In order to fully ensure this compression amount, there are tiny gaps C1 and C2 between the plate surfaces 131b and 131c on both sides of the joint plate 131 and the flange surfaces 142d and 143d of the flanges 142b and 143b of the pair of sealing parts 142 and 143. These gaps C1 and C2 are not constant and are set to have tolerances.

[0097] like Figure 5A As shown, the separation dimension from the tube contact surface 112 of the cluster bar 110 to the tube contact surface 142c of the insulating member 140 is L1. This separation dimension L1 may be appropriately referred to as "separation distance L1 between the cluster bar 110 and the insulating member 140", "separation dimension L1 between the contact surfaces 112 and 142c", or simply "separation dimension L1".

[0098] like Figure 2 and Figure 5A As shown, the tolerance of the separation dimension L1 is large. The reason for this is, for example, based on the accumulation of the following dimensional tolerances. The first tolerance is the tolerance of the position of the contact surface of the sealing component 134 relative to the bottom wall 21 of the housing 20. The second tolerance is the tolerance of the thickness th of the sealing component 134. The third tolerance is the assembly tolerance from the first plate surface 131b of the connector plate 131 to the tube contact surface 142c of the insulating component 140. The fourth tolerance is the axial tolerance of the assembly position of the stator 103 relative to the housing 20. The fifth tolerance is the axial tolerance of the assembly position of the cluster bar 110 relative to the stator 103.

[0099] like Figure 5A As shown, each connector pin 132 is covered in a liquid-tight manner by each annular insulating tube 150 having elasticity and electrical insulation.

[0100] Next, one of the plurality of insulating tubes 150 will be described in detail as a representative example.

[0101] like Figure 5A As shown, the insulating tube 150 is a hollow body having a circular cross-section that matches the cross-sectional shape of the connector pin 132. As an example of the material of the insulating tube 150, rubber having electrical insulation properties can be cited. The total length L2 of the insulating tube 150 (see Figure 6 ), that is, the natural length L2 is greater than the separation dimension L1 between the contact surfaces 112 and 142c. The dimension difference ΔL=L2-L1 (the dimension difference ΔL is not shown).

[0102] The insulating tube 150 includes low-rigidity portions 160, 160 at both ends of the axial direction and a central portion 170 (support portion 170) between these low-rigidity portions 160, 160. The low-rigidity portions 160, 160 at both ends of the axial direction are formed symmetrically with each other and are the same size. The rigidity of each low-rigidity portion 160, 160 is lower than the rigidity of the central portion 170 (support portion 170) in the axial direction of the insulating tube 150. Here, the low-rigidity portions 160, 160 with low rigidity refer to portions that are more easily deformed (easily contracted) in the axial direction than the central portion 170 when the insulating tube 150 is compressed in the axial direction of the connector pin 132.

[0103] The support portion 170 is a straight tube structure with a circular cross section. The hole diameter d1 of the hollow support portion 170 (see Figure 6 ), that is, the inner diameter d1 is smaller than the diameter d2 of the connector pin 132 .

[0104] The insulating tube 150 configured in this manner is sandwiched between the cluster bar 110 and the insulating component 140, that is, between the tube contact surface 112 of the cluster bar 110 and the tube contact surface 142c of the insulating component 140. Due to the above-mentioned dimension difference ΔL, the axial compressive force of the connector pin 132 acts on the insulating tube 150. In this way, the insulating tube 150 is sandwiched between the cluster bar 110 and the insulating component 140, so that the low-rigidity parts 160, 160 shrink and closely adhere to the contact surfaces 112, 142c, thereby improving the liquid tightness.

[0105] To explain in more detail, Figure 5A to Figure 5C As shown, each low rigidity portion 160 is composed of a constriction portion 161. Each low rigidity portion 160 has a constriction portion 161 having gaps Cr (spaces Cr, Cr) between the outer peripheral surface 132a of the connector pin 132 and the inner peripheral surface 150a of the insulation tube 150.

[0106] Therefore, when the axial compressive force of the connector pin 132 acts on the insulating tube 150, the contracted portions 161, 161 are easily expanded and contracted toward the radially outer side of the insulating tube 150 (see Figure 5B imaginary line) or expand and contract radially inwardly of the insulating tube 150 (refer to Figure 5C The front end surfaces 165, 165 of the contraction portions 161, 161 (low rigidity portions 160, 160) can form a stable sealing surface.

[0107] like Figure 6As shown, the contracted portions 161, 161 can be constituted by, for example, enlarged diameter portions 164, 164. That is, each low rigidity portion 160, 160 is constituted by an enlarged diameter portion 164, 164 whose diameter increases from the base end 162, 162 (the root 162, 162 of the low rigidity portion 160, 160 relative to the support portion 170) toward the front end 163, 163. Examples of the shape of the enlarged diameter portion 164, 164 include a cone shape, a trumpet shape, and a bell shape.

[0108] The front ends 163, 163 of the low rigidity parts 160, 160 have a structure capable of contacting with the contact surfaces 112, 142c (see Figure 5A ) tightly fit front end faces 165, 165 (sealing surfaces 165, 165).

[0109] Each of the front ends 163, 163 has an inner corner 167, 167 formed by the front end surface 165, 165 and the inner peripheral surface 166, 166, and an outer corner 169, 169 formed by the front end surface 165, 165 and the outer peripheral surface 168, 168. The inner corners 167, 167 and the outer corners 169, 169 are formed in a curved surface shape. The curvature radius of the curved surface 167a, 167a of the inner corners 167, 167 (the inner curved surface 167a, 167a) is r1. The curvature radius of the curved surface 169a, 169a of the outer corners 169, 169 (the outer curved surface 169a, 169a) is r2, which is smaller than the curvature radius r1 of the inner curved surface 167a, 167a. That is, the curved surfaces 167 a and 167 a of the inner corner portions 167 and 167 have a larger curvature radius than the curved surfaces 169 a and 169 a of the outer corner portions 169 and 169 ( r1 > r2 ).

[0110] like Figure 6 As shown, the insulating tube 150 has the same thickness t1 of the low rigidity parts 160, 160 and the same thickness t2 of the support part 170. Thus, the thicknesses t1 and t2 of the insulating tube 150 are the same over the entire length L2.

[0111] It should be noted that the wall thickness of the insulating tube 150 can also be Figure 7 That is, when observing the low rigidity parts 160, 160 in all cross sections (cross sections cut into discs) perpendicular to the center line ch of the insulating tube 150, the wall thickness t11, t12 of each cross section is set to the same size as the wall thickness t2 of the support part 170 (t11=r12=t2).

[0112] The description of Example 1 is summarized as follows.

[0113] like Figure 1 and Figure 2As shown, the electric compressor 10 includes: a sealed shell 20; a compression mechanism 50, which compresses and discharges the refrigerant sucked into the shell 20; an electric motor 100, which is accommodated in the shell 20 in a manner to drive the compression mechanism 50; a wiring hub 110, which accommodates a connecting terminal 106 electrically connected to the electric motor 100 and is accommodated in the shell 20; and a sealing joint 130, which is arranged in the shell 20 and is electrically connected to the connecting terminal 106.

[0114] The sealing joint 130 includes a joint plate 131 fixed to the housing 20, and a through hole 131a (see Figure 4 ) and a connector pin 132 that electrically connects the connection terminal 106 to the outside of the housing 20, and an insulating component 140 that is filled between the connector plate 131 and the connector pin 132 and performs sealing and insulation.

[0115] like Figure 5A As shown, the connector pin 132 is covered liquid-tightly by an elastic and electrically insulating annular insulating tube 150. The insulating tube 150 has low-rigidity portions 160, 160 at both axial ends thereof, which are lower in rigidity than the axial center portion 170 (support portion 170) of the insulating tube 150, and is sandwiched between the cluster bar 110 and the insulating member 140.

[0116] The separation distance L1 from the insulating member 140 to the cluster bar 110 is greater than the natural length L2 of the insulating tube 150 (see Figure 6 )short.

[0117] In contrast, in the first embodiment, the insulating tube 150 includes low-rigidity portions 160, 160 having flexibility in the axial direction at both ends of the connector pin 132, and is sandwiched between the insulating member 140 and the cluster bar 110. The front end surfaces 165, 165 (sealing surfaces 165, 165) of one low-rigidity portion 160 (first low-rigidity portion 160) are in contact with the end surface 142c (tube contact surface 142c) of the insulating member 140 in the axial direction of the connector pin 132. The front end surfaces 165, 165 (sealing surfaces 165, 165) of the other low-rigidity portion 160 (second low-rigidity portion 160) are in contact with the end surface 112 (tube contact surface 112) of the cluster bar 110 in the axial direction of the connector pin 132 by fitting the connector pin 132 into the connection terminal 106.

[0118] Each low-rigidity portion 160, 160 can easily expand and contract in the radial direction in accordance with the axial compressive force acting on the insulation tube 150. The length of the insulation tube 150 changes in accordance with the expansion and contraction in the radial direction of each low-rigidity portion 160, 160. Therefore, the length of the insulation tube 150 changes according to the separation distance L1 from the tube contact surface 142c of the insulation component 140 to the tube contact surface 112 of the cluster bar 110, thereby enabling clamping.

[0119] In the first embodiment, the dimensional tolerance of the separation distance L1 from the insulating member 140 to the cluster bar 110 is large. However, by making the length L2 of the insulating tube 150 (see Figure 6 ) changes, and can absorb dimensional tolerances. In this way, the insulating tube 150 can be sufficiently elastically deformed and contracted with respect to a large change in the axial direction, and can seal and cover the connector pin 132. As a result, the liquid tightness with respect to liquid refrigerant and lubricating oil can be improved, and the electrical insulation between the insulating component 140 and the busbar 110 can be further improved.

[0120] Moreover, in Example 1, when the insulating tube 150 is sandwiched between the insulating component 140 and the wiring hub 110, the sealing surfaces 165, 165 of the elastic low-rigidity portions 160, 160 are in contact with the tube contact surface 142c of the insulating component 140 or the tube contact surface 112 of the wiring hub 110 in the axial direction of the connector pin 132.

[0121] Therefore, even if the flatness or parallelism of the tube contact surface 142c of the insulating component 140 and the tube contact surface 112 of the cable hub 110 is not in an optimal state, the sealing surfaces 165, 165 of each low-rigidity portion 160, 160 elastically deform along the tube contact surfaces 112, 142c, thereby being able to fully ensure air tightness and liquid tightness with each tube contact surface 112, 142c (including the connector pin 132). As a result, the electrical insulation between the insulating component 140 and the cable hub 110 can be further improved.

[0122] As described above, in the first embodiment, it is possible to improve the electrical insulation between the insulating member 140 and the bus bar 110 .

[0123] In addition, in Example 1, Figure 5A to Figure 5C As shown, each low-rigidity portion 160 , 160 includes a constricted portion 161 , 161 having gaps Cr, Cr (spaces Cr, Cr) between the outer peripheral surface 132 a of the connector pin 132 and the inner peripheral surface 150 a of the insulation tube 150 .

[0124] In this way, each low-rigidity portion 160, 160 has a contraction portion 161, 161 having a gap Cr, Cr between the outer peripheral surface 132a of the connector pin 132 and the inner peripheral surface 150a of the insulating tube 150. Therefore, according to the axial compression force of the connector pin 132 acting on the insulating tube 150, it can not only easily expand and contract radially outward of the insulating tube 150, but also easily expand and contract inward, thereby forming a stable sealing surface, improving the liquid tightness relative to the liquid refrigerant and lubricating oil, and achieving an improvement in the electrical insulation between the insulating component 140 and the bus bar 110.

[0125] In addition, in Example 1, Figure 5A and Figure 6 As shown, a support portion 170 is provided between the low-rigidity portions 160 , 160 . The hole diameter d1 (inner diameter d1 ) of the support portion 170 is smaller than the diameter d2 of the connector pin 132 .

[0126] In this way, since the hole diameter d1 (inner diameter d1) of the support portion 170 is smaller than the diameter d2 of the connector pin 132, the connector pin 132 can be kept embedded in the support portion 170 by its own elasticity, and the contraction portions 161, 161 can be assembled with certain gaps Cr, Cr around the connector pin 132. Therefore, stable sealing surfaces 165, 165 are formed between the sealing surfaces 165, 165 of the contraction portions 161, 161 and the tube contact surfaces 112, 142c, which can improve the liquid tightness with respect to liquid refrigerant and lubricating oil, and improve the electrical insulation between the insulating component 140 and the busbar 110. In addition, the insulating tube 150 does not fall off from the connector pin 132, so the connector pin 132 can be easily assembled with respect to the connection terminal 106.

[0127] In addition, in Example 1, Figure 6 As shown, for the front ends 163, 163 of the low rigidity parts 160, 160, the inner corners 167, 167 formed by the front end faces 165, 165 and the inner peripheral faces 166, 166, and the outer corners 169, 169 formed by the front end faces 165, 165 and the outer peripheral faces 168, 168 are formed into curved surfaces. The curved surfaces 167a, 167a of the inner corners 167, 167 have a larger curvature radius r1 than the curved surfaces 169a, 169a of the outer corners 169, 169.

[0128] Therefore, when the insulating tube 150 is compressed in the axial direction of the joint pin 132, even if the contact position of the sealing surfaces 165, 165 of the contraction parts 161, 161 is displaced radially inward relative to the tube contact surface 142c of the insulating component 140 and the tube contact surface 112 of the cluster bar 110, the sealing surfaces 165, 165 can be stably formed into a circle surrounding the joint pin 132. The joint pin 132 can be covered liquid-tightly by the insulating tube 150. Therefore, the liquid-tightness with respect to the liquid refrigerant and lubricating oil sucked into the housing 20 can be improved, and the electrical insulation between the insulating component 140 and the cluster bar 110 can be improved.

[0129] In addition, in Example 1, Figure 6As shown, each low rigidity portion 160, 160 is composed of an enlarged diameter portion 164, 164 whose diameter increases from the base end 162, 162 toward the front end 163, 163. In this way, by forming each low rigidity portion 160, 160 with an enlarged diameter portion 164, 164, it deforms in the enlarged diameter direction when compressed in the axial direction, thereby being easier to deform and able to follow the change in axial length compared to a linear structure. In this way, the low rigidity portion 160, 160 expands in diameter and contracts in the axial direction, thereby being able to absorb the separation distance L1 (refer to Figure 5A )’s dimensional tolerance causes displacement of the insulating tube 150.

[0130] In addition, in Example 1, Figure 6 and Figure 7 As shown, the wall thickness t1, t2, t11, and t12 of the insulating tube 150 are the same throughout the length range L2. If the wall thickness varies greatly depending on the location of the insulating tube 150, the elasticity will be uneven depending on the location, which will affect the formation of stable sealing surfaces 165, 165 caused by uniform contraction. However, in the first embodiment, the wall thickness t1, t2, t11, and t12 are the same throughout the length range L2 of the insulating tube 150, so that the overall contraction can be roughly uniform. Therefore, the entire insulating tube 150 can be used to cope with axial compression, and material can be saved.

[0131] <Example 2>

[0132] Reference Fig. 8A and Figure 8B The electric compressor 200 according to the second embodiment will be described. Fig. 8A and Figure 8B Equivalent to the above Figure 5A .

[0133] The electric compressor 200 of the second embodiment is characterized in that the above Figure 1 to Figure 7 The tube contact surfaces 112 and 142c of the electric compressor 10 of the first embodiment shown are changed to Fig. 8A and Figure 8B The other basic structures are the same as those of the electric compressor 10 of the first embodiment. The parts common to the electric compressor 10 of the first embodiment are marked with the same reference numerals and detailed descriptions are omitted.

[0134] The cluster bar 110 of the second embodiment has a tube contact surface 212 that contacts the front end surface 165 of any of the low-rigidity portions 160, 160 provided at both ends of the insulating tube 150 in the axial direction. The tube contact surface 212 corresponds to Figure 5A The tube contact surface 112 shown is Fig. 8A The sphere shown or Figure 8B The structure of the conical surface shown.

[0135] When the insulating tube 150 is compressed in the axial direction of the joint pin 132, the low rigidity portion 160 is compressed by contacting with the spherical surface (refer to Fig. 8A ) or conical surface (refer to Figure 8B ) and expand radially outward. Therefore, even if the contact position of the sealing surface 165 (front end surface 165) of the low rigidity portion 160 is displaced radially inward relative to the cluster bar 110, the sealing surface 165 can be stably formed into a circle surrounding the connector pin 132. The connector pin 132 can be covered liquid-tightly by the insulating tube 150. Therefore, the liquid-tightness with respect to the liquid refrigerant or lubricating oil sucked into the housing 20 can be improved.

[0136] Moreover, when the tube contact surface 212 of the cable hub 110 is made into a spherical surface or a conical surface, even if the center line ch of the sealing surface 165 (front end surface 165) of the low-rigidity portion 160 is inclined relative to the center line FA of the tube contact surface 212, the front end surface 165 of the contraction portion 161 can be elastically deformed along the spherical surface or the conical surface to follow (align).

[0137] The insulating member 140 (first sealing member 142) has a tube contact surface 242c that contacts the front end surface 165 of any of the low rigidity portions 160, 160 provided at both axial ends of the insulating tube 150. The tube contact surface 242c corresponds to Figure 5A The tube contact surface 142c shown is Fig. 8A The sphere shown or Figure 8B The structure of the conical surface shown.

[0138] When the insulating tube 150 is compressed in the axial direction of the joint pin 132, the low rigidity portion 160 is compressed by contacting with the spherical surface (refer to Fig. 8A ) or conical surface (refer to Figure 8B ) and expand radially outward. Therefore, even if the contact position of the sealing surface 165 of the low rigidity portion 160 is displaced radially inward relative to the insulating component 140, the sealing surface 165 can be stably formed into a circle surrounding the joint pin 132. The joint pin 132 can be covered liquid-tightly by the insulating tube 150. Therefore, the liquid-tightness with respect to the liquid refrigerant or lubricating oil sucked into the housing 20 can be improved.

[0139] Moreover, when the tube contact surface 242c of the insulating component 140 is set to a spherical surface or a conical surface, even if the center line ch of the front end surface 165 of the low-rigidity portion 160 is inclined relative to the center line FB of the tube contact surface 142c, the front end surface 165 of the low-rigidity portion 160 can elastically deform and follow (align) along the spherical surface or the conical surface.

[0140] The electric compressor 200 of the second embodiment can produce the same effects as the electric compressor 10 of the first embodiment described above, in addition to the effects of the second embodiment.

[0141] <Example 3>

[0142] Reference Fig.9A and Fig. 9B The electric compressor 300 according to the third embodiment will be described. Fig.9A and Fig. 9B Equivalent to the above Figure 5A .

[0143] The electric compressor 300 of the third embodiment is characterized in that the above Figure 1 to Figure 7 The low rigidity portions 160, 160 of the insulating tube 150 of the electric compressor 10 of the first embodiment shown in the figure are changed to Fig.9A and Fig. 9B The low rigidity parts 360, 360 of the insulating tube 350 are shown. The other basic structures are the same as those of the electric compressor 10 of the first embodiment. The parts common to the electric compressor 10 of the first embodiment are marked with the same reference numerals and detailed descriptions are omitted.

[0144] The insulating tube 350 is characterized in that at least a part or all of one or both of the low-rigidity portions 360 , 360 provided at both axial ends are configured in a bellows shape that can contract in the axial direction of the insulating tube 350 .

[0145] By partially or entirely forming low rigidity portions 360 , 360 in a bellows shape, the axial contraction property can be improved when compressed in the axial direction. Therefore, displacement of insulation tube 350 caused by the dimensional tolerance of separation distance L1 from insulation member 140 to cluster bar 110 can be more easily absorbed.

[0146] The electric compressor 300 of the third embodiment can exert the same effects as the electric compressor 10 of the first embodiment described above, in addition to the effects of the third embodiment.

[0147] <Example 4>

[0148] Reference Fig. 10A and Fig. 10B An electric compressor 400 according to the fourth embodiment will be described. Fig. 10A Equivalent to the above Figure 5A .

[0149] The electric compressor 400 of the fourth embodiment is characterized in that the above Figure 1 to Figure 7 The supporting portion 170 of the insulating tube 150 of the electric compressor 10 of the first embodiment shown is changed to Fig. 10A and Fig. 10BThe supporting portion 470 (central portion 470) of the insulating tube 450 is shown. The other basic structures are the same as those of the electric compressor 10 of the first embodiment. The parts common to the electric compressor 10 of the first embodiment are marked with the same reference numerals and detailed descriptions are omitted.

[0150] At least a portion of the support portion 470 has a gripping portion 471 that is thickened toward the radially outer side of the support portion 470. For example, the gripping portion 471 is formed integrally with the outer peripheral surface of the hollow support portion 470 or a separate component is fixed thereto. In addition, the gripping portion 471 is set to a shape or size that can be gripped when the insulating tube 150 is assembled to the connector pin 132. Examples of the gripping shape of the gripping portion 471 include: Fig. 10B The cross-section shown is cross-shaped, circular in cross-section, and thick-walled.

[0151] Since the insulating tube 450 is a small component, the holding portion 471 with a thick wall toward the radially outer side of the support portion 470 can be easily held, and uneven compression of the contraction portions 161, 161 (enlarged diameter portions 164, 164) due to uneven wall thickness can be avoided, and liquid tightness can be improved by forming stable sealing surfaces 165, 165. Therefore, it is possible to achieve both improvement in electrical insulation between the insulating component 140 and the busbar 110 and improvement in assembly of the insulating tube 150 to the connector pin 132.

[0152] The electric compressor 400 of the fourth embodiment can exert the same effects as the electric compressor 10 of the first embodiment described above, in addition to the effects of the fourth embodiment.

[0153] It should be noted that the electric compressor 10; 200; 300; 400 of the present invention is not limited to the embodiments as long as it can achieve the functions and effects of the present invention.

[0154] For example, any two or more of the electric compressors 10 , 200 , 300 , and 400 may be combined.

[0155] The casing (20) may be configured to accommodate only the electric motor (100) without accommodating the compression mechanism (50).

[0156] The compression mechanism 50 is not limited to the structure of a scroll compression mechanism, and may be any mechanism as long as it is driven by the electric motor 100 to compress the refrigerant.

[0157] Industrial Applicability

[0158] The electric compressor 10; 200; 300; 400 of the present invention is suitable for use in a refrigeration cycle of a vehicle air conditioning system.

[0159] Description of Reference Numerals

[0160] 10; 200; 300; 400: electric compressor;

[0161] 20: Shell;

[0162] 50: compression mechanism;

[0163] 100: Electric motor;

[0164] 106: connection terminal;

[0165] 110: cable bus;

[0166] 112: tube contact surface of the cable collection row;

[0167] 130: Sealing joint;

[0168] 131: connector plate;

[0169] 131a: through hole;

[0170] 132: connector pin;

[0171] 140: Insulation parts;

[0172] 150; 350; 450: insulation tube;

[0173] 150a: inner circumferential surface of the insulating tube;

[0174] 160; 360: low rigidity part;

[0175] 161: contraction;

[0176] 162: base end;

[0177] 163: front end;

[0178] 164: diameter expansion part;

[0179] 165: front end face (sealing surface);

[0180] 166: inner circumference;

[0181] 167: medial angle;

[0182] 167a: curved surface of the inner corner;

[0183] 168: outer peripheral surface;

[0184] 169: lateral corner;

[0185] 169a: curved surface of the outer corner;

[0186] 170; 470: axial central portion (supporting portion);

[0187] 212: tube contact surface of the cable collection row;

[0188] 242c: tube contact surface of insulating component;

[0189] 471: grip;

[0190] Cr: gap;

[0191] d1: The aperture of the insulating tube (the aperture of the supporting part);

[0192] d2: outer diameter of the connector pin;

[0193] r1: the radius of curvature of the curved surface at the inner corner;

[0194] r2: radius of curvature of the curved surface at the outer corner;

[0195] t1, t2, t11, t12: wall thickness of the insulating tube.

Claims

1. An electric compressor, the electric compressor (10; 200; 300; 400) comprising: A sealed housing (20); a compression mechanism (50) for compressing and discharging the refrigerant sucked into the shell (20); an electric motor (100) housed in the housing (20) in a manner to drive the compression mechanism (50); A cable hub (110) which receives connection terminals (106) electrically connected to the motor (100) and is received in the housing (20); A sealing joint (130) is arranged on the housing (20) and is electrically connected to the connecting terminal (106). The sealing joint (130) comprises: A connector plate (131) fixed to the housing (20); A connector pin (132) inserted through a through hole (131a) of the connector plate (131) to electrically connect the connection terminal (106) to the outside of the housing (20); An insulating component (140) is filled between the connector plate (131) and the connector pin (132) to perform sealing and insulation; The electric compressor (10; 200; 300; 400) is characterized in that: The connector pin (132) is covered liquid-tightly by an annular insulating tube (150; 350; 450) having elasticity and electrical insulation. The insulating tube (150; 350; 450) has low-rigidity parts (160, 160; 360, 360) at both axial ends, which are lower in rigidity than the axial center part (170; 470) of the insulating tube (150; 350; 450), and is sandwiched between the cluster bar (110) and the insulating component (140).

2. The electric compressor according to claim 1, characterized in that: Each of the low-rigidity portions (160, 160; 360, 360) includes a contraction portion (161, 161) having a gap (Cr) between an outer peripheral surface (132a) of the connector pin (132) and an inner peripheral surface (150a) of the insulating tube (150).

3. The electric compressor according to claim 2, characterized in that: A supporting portion (170; 470) is provided between each of the low-rigidity portions (160, 160; 360, 360), The hole diameter (d1) of the support portion (170; 470) is smaller than the diameter (d2) of the connector pin (132).

4. The electric compressor according to claim 2, characterized in that: For the front ends (163, 163) of the respective low rigidity parts (160, 160; 360, 360), the inner corners (167, 167) formed by the front end faces (165, 165) and the inner peripheral faces (166, 166), and the outer corners (169, 169) formed by the front end faces (165, 165) and the outer peripheral faces (168, 168) are formed into curved surfaces. The curved surface (167a, 167a) of the inner corner portion (167, 167) has a larger curvature radius (r1) than the curved surface (169a, 169a) of the outer corner portion (169, 169).

5. The electric compressor according to claim 2, characterized in that: Each of the low-rigidity portions (160, 160; 360, 360) is composed of an enlarged diameter portion (164, 164) whose diameter increases from the base end (162, 162) toward the front end (163, 163).

6. The electric compressor according to claim 2, characterized in that: The wall thickness (t1, t2) of the insulating tube (150) is the same over the entire length.

7. The electric compressor according to claim 2, characterized in that: The cluster bar (110) has a tube contact surface (212) that contacts the front end surface (165) of any one of the low-rigidity portions (160, 160) provided at both axial ends of the insulating tube (150). The tube contact surface (212) is a spherical surface or a conical surface.

8. The electric compressor according to claim 2, characterized in that: The insulating member (140) has a tube contact surface (242c) that contacts the front end surface (165) of any one of the low-rigidity portions (160, 160) provided at both axial ends of the insulating tube (150). The tube contact surface (242c) is a spherical surface or a conical surface.

9. The electric compressor according to claim 2, characterized in that: The insulating tube (350) is configured in a corrugated shape such that at least a portion or all of one or both of the low-rigidity portions (360, 360) provided at both axial ends can be contracted in the axial direction of the insulating tube (350).

10. The electric compressor according to claim 3, characterized in that: At least a portion of the support portion (470) includes a gripping portion (471) that is thickened toward the radially outer side of the support portion (470).

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