JP6881377B2 - Electric compressor - Google Patents

Description

The present invention relates to an electric compressor.

The electric compressor disclosed in Patent Document 1 includes a compression unit that compresses a refrigerant, an electric motor that drives the compression unit and has a multi-phase coil, a motor drive circuit that drives the electric motor, and a motor drive circuit and electricity. A conductive member connected to each other, a motor wiring drawn from each phase of the multi-phase coil, and a phase wire connection portion in which the phase wires drawn from each phase of the multi-phase coil are electrically connected to each other. To be equipped. Further, the electric compressor disclosed in Patent Document 1 includes a connection terminal for electrically connecting the motor wiring and the conductive member, an insulating cluster block for accommodating the connection terminal inside, and an electric motor and a cluster block. It is provided with a housing forming a motor accommodating chamber. The cluster block has a terminal accommodating chamber for accommodating connection terminals and a phase wire accommodating chamber for accommodating a bundle of phase wires. The phase wire accommodating chamber is sealed with a rubber stopper and isolated from the motor accommodating chamber.

Japanese Unexamined Patent Publication No. 2013-072338

In such an electric compressor, the pressure in the phase wire accommodating chamber sealed by the rubber stopper is substantially constant, whereas the pressure in the motor accommodating chamber fluctuates. Therefore, a pressure difference may occur between the phase wire accommodating chamber and the motor accommodating chamber, and the cluster block may be damaged.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric compressor capable of suppressing the occurrence of a pressure difference inside and outside a cluster block.

The electric compressor for solving the above problems includes a compression unit that compresses the refrigerant, an electric motor that drives the compression unit and has a multi-phase coil, a motor drive circuit that drives the electric motor, and the above. The conductive member electrically connected to the motor drive circuit, the motor wiring drawn from each phase of the multi-phase coil, and the phase wire drawn from each phase of the multi-phase coil are electrically connected to each other. The phase wire connecting portion, the connection terminal for electrically connecting the motor wiring and the conductive member, the insulating cluster block for accommodating the connection terminal inside, and the electric motor and the cluster block. The cluster block includes a housing forming a motor accommodating chamber for accommodating, and the cluster block has a terminal accommodating chamber for accommodating the connection terminals and a motor wiring insertion hole through which the motor wiring is inserted, and the terminal accommodating chamber. Is an electric compressor communicating with the motor accommodating chamber through the motor wiring insertion hole, and the cluster block includes a phase wire accommodating chamber accommodating the phase wire connecting portion and the phase wire accommodating chamber. It has an internal communication passage that communicates with the terminal accommodation chamber, and the phase wire accommodation chamber and the motor accommodation chamber are provided only through the internal communication passage, the terminal accommodation chamber, and the motor wiring insertion hole. The gist is that they are in communication.

According to this, the pressure in the phase wire accommodating chamber is made uniform with the pressure in the motor accommodating chamber through the internal communication passage, the terminal accommodating chamber, and the motor wiring insertion hole. Therefore, it is possible to suppress the occurrence of a pressure difference inside and outside the cluster block. As a result, damage to the cluster block caused by the pressure difference between the inside and outside of the cluster block can be suppressed.

Further, regarding the electric compressor, the cluster block accommodates the terminal while fitting the case member having the terminal accommodating hole for accommodating the connection terminal and the opening of the terminal accommodating hole so as to close the opening. It is preferable that the lid member forming the chamber is provided, and the motor wiring insertion hole is formed between the inner peripheral surface of the terminal accommodating hole and the outer peripheral surface of the lid member.

When a refrigerant containing lubricating oil enters the terminal accommodating chamber, the lubricating oil becomes a conductor that conducts the connection terminal and the housing, and there is a risk that insulation between the connection terminal and the housing cannot be ensured. On the other hand, since the opening of the terminal accommodating hole is closed by the lid member, it becomes difficult for the refrigerant containing the lubricating oil to enter the terminal accommodating chamber. Therefore, the insulation between the connection terminal and the housing is ensured.

Further, the motor wiring insertion hole is formed by assembling the case member and the lid member. Therefore, for example, as compared with the case where the through hole penetrating the lid member is used as the motor wiring insertion hole, the motor wiring insertion hole can be easily formed and the motor wiring can be easily inserted into the motor wiring insertion hole.

Further, the electric compressor is provided with an insulating tube member that covers the motor wiring and is inserted into the motor wiring insertion hole, and the terminal accommodating chamber is a gap between the inside of the tube member and the motor wiring. It is preferable that the motor accommodating chamber is communicated with the motor accommodating chamber.

If a refrigerant containing lubricating oil enters the terminal accommodation chamber through the motor wiring insertion hole, the lubricating oil becomes a conductor that conducts the connection terminal and the housing, and there is a risk that insulation between the connection terminal and the housing cannot be ensured. is there. It is generally known that the resistance of a conductor is proportional to the length of the conductor. That is, the longer the length of the conductor, the smaller the resistance of the conductor. Therefore, the longer the distance (insulation distance between the connection terminal and the housing) that the connection terminal and the housing conduct with each other via the lubricating oil, the higher the insulation property between the connection terminal and the housing can be improved.

In the configuration in which the tube member is not provided, the refrigerant flowing in the motor accommodating chamber enters the terminal accommodating chamber through the gap between the motor wiring insertion hole and the motor wiring. On the other hand, in the configuration in which the tube member is provided, the refrigerant flowing in the motor accommodating chamber enters the terminal accommodating chamber through the gap between the inside of the tube member and the motor wiring. By providing the tube member, the insulation distance between the connection terminal and the housing becomes longer as compared with the case where the tube member is not provided. Therefore, the insulation between the connection terminal and the housing can be improved.

According to the present invention, it is possible to suppress the occurrence of a pressure difference inside and outside the cluster block.

A side sectional view of the electric compressor of the embodiment. An exploded perspective view of the connector. Sectional view of the connector. Front view of the cover member. Front view of cover member and lid member. Perspective view of the connector.

Hereinafter, an embodiment in which the electric compressor is embodied will be described with reference to FIGS. 1 to 6.
As shown in FIG. 1, the housing 11 of the electric compressor 10 is connected to a bottomed tubular motor housing 12 having an opening 12a formed at one end (left end of FIG. 1) and one end of the motor housing 12. It has a bottomed tubular discharge housing 13. A bottomed tubular inverter cover 14 is attached to the bottom wall 121 of the motor housing 12. A discharge chamber S1 is partitioned between the motor housing 12 and the discharge housing 13. A discharge port 15 is formed on the bottom wall of the discharge housing 13, and an external refrigerant circuit (not shown) is connected to the discharge port 15. A suction port (not shown) is formed on the peripheral wall 122 of the motor housing 12, and an external refrigerant circuit is connected to the suction port.

A rotating shaft 16, a compression unit 17 for compressing the refrigerant, and an electric motor 18 for driving the compression unit 17 are housed in the motor housing 12. Therefore, the motor housing 12 forms a motor accommodating chamber S3 for accommodating the electric motor 18. The electric motor 18 drives the rotating shaft 16. The compression unit 17 is driven by the rotation of the rotating shaft 16. The electric motor 18 is arranged closer to the bottom wall 121 (right side in FIG. 1) of the motor housing 12 than the compression unit 17.

In the motor accommodating chamber S3, a shaft support member 19 is provided between the compression unit 17 and the electric motor 18. An insertion hole 19a through which one end of the rotating shaft 16 is inserted is formed in the central portion of the shaft support member 19. A radial bearing 16a is provided between the insertion hole 19a and one end of the rotating shaft 16. One end of the rotating shaft 16 is rotatably supported by the shaft support member 19 via a radial bearing 16a.

A bearing portion 121a is recessed in the bottom wall 121 of the motor housing 12. The other end of the rotating shaft 16 is inserted inside the bearing portion 121a. A radial bearing 16b is provided between the bearing portion 121a and the other end of the rotating shaft 16. The other end of the rotating shaft 16 is rotatably supported by the bearing portion 121a via the radial bearing 16b.

Further, the accommodation space S2 is partitioned by the bottom wall 121 of the motor housing 12 and the inverter cover 14. In the accommodation space S2, a motor drive circuit 20 (shown by a chain double-dashed line in FIG. 1) is attached to the outer surface of the bottom wall 121 on the inverter cover 14 side. Therefore, in the present embodiment, the compression unit 17, the electric motor 18, and the motor drive circuit 20 are arranged side by side in this order along the extending direction (axial direction) of the axis L of the rotating shaft 16.

The compression unit 17 includes a fixed scroll 17a fixed in the motor accommodating chamber S3 and a movable scroll 17b arranged to face the fixed scroll 17a. A volume-changeable compression chamber S4 is formed between the fixed scroll 17a and the movable scroll 17b. The refrigerant compressed by changing the volume of the compression chamber S4 is discharged to the discharge chamber S1. For the refrigerant flowing through the motor accommodating chamber S3, the compression chamber S4, and the discharge chamber S1, lubrication of the sliding portion in the electric compressor 10 (in this embodiment, for example, lubrication of the fixed scroll 17 and the movable scroll 17b) is applied. It contains lubricating oil to make it good.

The electric motor 18 is composed of a rotor 21 (rotor) that rotates integrally with the rotating shaft 16 and a stator 22 (stator) that is fixed to the inner peripheral surface of the motor housing 12 so as to surround the rotor 21. There is.

The rotor 21 has a rotor core 23 having a cylindrical shape, and the rotor core 23 is fastened to a rotating shaft 16. A plurality of permanent magnets 24 are embedded in the rotor core 23, and the permanent magnets 24 are provided at equal pitches in the circumferential direction of the rotor core 23. The stator 22 has an annular stator core 25 fixed to the inner peripheral surface of the motor housing 12, and U-phase, V-phase, and W-phase coils 26 provided on the stator core 25.

The first coil end 261 of each phase projects from one end surface 251 of the stator core 25. The second coil end 262 of each phase protrudes from the other end surface 252 of the stator core 25. The first coil end 261 is located on the compression portion 17 side (one end side in the axial direction of the rotating shaft 16), and the second coil end 262 is located on the motor drive circuit 20 side (the other end side in the axial direction of the rotating shaft 16). positioned.

Two motor wirings 27 and two phase wires 28 are drawn out from the first coil end 261 of each phase. The U-phase, V-phase, and W-phase coils 26 have a double-wire structure formed by winding two conducting wires in order to reduce the voltage. Note that FIG. 1 shows, for example, only two U-phase motor wirings 27 and two U-phase phase wires 28. Each motor wiring 27 and each phase wire 28 are drawn from the first coil end 261 in a state where the conductor of the coil 26 drawn from the first coil end 261 is covered with an insulating coating.

As shown in FIG. 2, each phase wire 28 corresponding to the U-phase, V-phase, and W-phase coils 26 is bundled as a phase wire bundle 29. At the tip of each phase wire 28, the conducting wire from which the insulating coating has been removed is exposed. The phase wire bundle 29 has a phase wire connecting portion 29a (neutral point) in which the tip portions of the phase wire 28 are electrically connected to each other.

As shown in FIG. 1, a through hole 121b is formed in the bottom wall 121 of the motor housing 12. An airtight terminal 31 is provided in the through hole 121b. The airtight terminal 31 has three conductive members 32 (only one is shown in FIG. 1) corresponding to the U-phase, V-phase, and W-phase coils 26. Each conductive member 32 is a columnar metal terminal extending linearly. Each conductive member 32 is inserted through a through hole 121b and one end is electrically connected to a motor drive circuit 20 via a cable 20a. The other end of each conductive member 32 projects from the accommodation space S2 into the motor accommodation chamber S3 via the through hole 121b. Further, the airtight terminal 31 has three insulating members 33 made of glass (only one is shown in FIG. 1) that insulates and fixes each conductive member 32 to the bottom wall 121.

The connector 40 is housed in the motor housing chamber S3. The connector 40 connects the motor wiring 27 and the conductive member 32. The connector 40 is arranged on the outer peripheral side of the stator core 25 and the second coil end 262 in the radial direction of the rotating shaft 16.

As shown in FIG. 2, the connector 40 includes three connection terminals 50 corresponding to the U-phase, V-phase, and W-phase coils 26, and an insulating cluster block 60 accommodating the three connection terminals 50. ing.

Each connection terminal 50 has a first connection portion 51 electrically connected to the motor wiring 27 on one end side in the longitudinal direction, and a second connection portion 52 electrically connected to the conductive member 32 in the longitudinal direction. It is held on the other end side of. The first connecting portion 51 extends linearly. The tip of the motor wiring 27 is connected to the first connection portion 51. In the two motor wirings 27 of each phase, the portion on the side of the first connection portion 51 is inserted into the cylindrical insulating tube member 30 and covered with the tube member 30. Further, at the tip of each motor wiring 27, a conducting wire that is not covered by the tube member 30 and has the insulating coating removed is exposed. The inner diameter of the tube member 30 is larger than the diameter of two motor wirings 27. Therefore, a gap is formed between the motor wiring 27 and the inner peripheral surface 30a of the tube member 30.

Each connection terminal 50 has a caulking portion 53 that crimps an end portion of the tube member 30 on the first connecting portion 51 side and two motor wirings 27. The caulking portion 53 extends from one end of the first connecting portion 51 on the tube member 30 side so as to surround the tube member 30. The motor wiring 27 is mechanically connected to each connection terminal 50 by being crimped by the caulking portion 53 in a state of being inserted into the tube member 30. The second connecting portion 52 has a substantially long square cylinder shape continuous with the other end of the first connecting portion 51. The other end of the conductive member 32 is inserted inside the square cylinder of the second connecting portion 52. The axial direction of the square cylinder of the second connecting portion 52 coincides with the longitudinal direction of the first connecting portion 51. Therefore, the insertion direction of the conductive member 32 with respect to the second connection portion 52 of the connection terminal 50 coincides with the longitudinal direction of the first connection portion 51.

As shown in FIGS. 2 and 3, the cluster block 60 includes a case member 61 and a lid member 71 assembled to the case member 61.
As shown in FIG. 2, the case member 61 has a flat square box shape formed by a bottom wall 62 and a side wall 63 erected from the edge of the bottom wall 62. The case member 61 has a terminal accommodating hole 64. As shown in FIG. 3, in the terminal accommodating hole 64, each connection terminal 50, a part of the tube member 30 on the first connection portion 51 side, and one of the two motor wirings 27 on the first connection portion 51 side. The department is housed. The terminal accommodating hole 64 has three insertion holes 64a and an opening 64b connected to the three insertion holes 64a. The opening 64b opens on the side wall 63 on the side opposite to the bottom wall 62 side. Each insertion hole 64a is partitioned from another insertion hole 64a by a partition wall 65 formed in the case member 61. Each insertion hole 64a has an elongated hole shape whose axial center extends from the bottom wall 62 along the erection direction of the side wall 63. The axial direction of each insertion hole 64a coincides with the longitudinal direction of the first connection portion 51 of the connection terminal 50.

As shown in FIG. 4, the three insertion holes 64a are arranged side by side. Therefore, the second connection portion 52 of each connection terminal 50 accommodated in the terminal accommodation hole 64 is also arranged. When viewed from the front of the case member 61, each insertion hole 64a has a substantially quadrangular shape. The longitudinal direction of each insertion hole 64a coincides with the longitudinal direction of the square cylinder of each second connecting portion 52, and the lateral direction of each insertion hole 64a coincides with the lateral direction of the square cylinder of each second connecting portion 52. There is. Further, the longitudinal direction of each insertion hole 64a is inclined with respect to the long side of the case member 61.

The bottom wall 62 of the case member 61 is formed with a circular through hole 62a communicating with each insertion hole 64a. Each through hole 62a is located inside the square cylinder of each second connection portion 52 when viewed from the axial direction of each through hole 62a. Further, as shown in FIGS. 2 and 3, three cylindrical guide portions 62b are provided so as to project from the outer surface of the bottom wall 62 of the case member 61. The inside of each guide portion 62b communicates with each through hole 62a. The axis of each guide portion 62b and the axis of each through hole 62a coincide with each other. The other end of each conductive member 32 is inserted into the inside of each guide portion 62b and the inside of the square cylinder of the second connection portion 52 of each connection terminal 50 via the through holes 62a. As a result, each conductive member 32 and each connection terminal 50 are electrically connected. Therefore, the inside of each guide portion 62b and each through hole 62a form a conductive member insertion hole 66 through which each conductive member 32 is inserted. Therefore, the case member 61 has a conductive member insertion hole 66.

As shown in FIGS. 3 and 4, the case member 61 has a bottomed cylindrical phase wire accommodating chamber 67 inside. The phase wire accommodating chamber 67 accommodates the phase wire connecting portion 29a of the phase wire bundle 29. The phase wire accommodating chamber 67 has an elongated hole shape whose axial center extends from the bottom wall 62 along the erection direction of the side wall 63. The axial direction of the phase wire accommodating chamber 67 coincides with the axial direction of the insertion hole 64a. The phase line accommodating chamber 67 is partitioned from each insertion hole 64a by a partition wall 65. The phase wire accommodating chamber 67 is provided through the length of the insertion hole 64a located in the center of the three insertion holes 64a arranged side by side, the short side of the insertion hole 64a located on one end side, and the partition wall 65. Next to each other. The phase wire accommodating chamber 67 is connected to the opening 64b of the terminal accommodating hole 64.

The partition wall 65 has a groove 68 in each insertion hole 64a and an end surface 65a in which the phase line accommodating chamber 67 opens. One end of the groove 68 communicates with the terminal accommodating hole 64 located at the center of the three terminal accommodating holes 64, and the other end of the groove 68 communicates with the phase wire accommodating chamber 67.

Each connection terminal 50 is accommodated in each insertion hole 64a via an opening 64b so that the second connection portion 52 is located closer to the conductive member insertion hole 66 than the first connection portion 51. Further, the phase wire bundle 29 is accommodated in the phase wire accommodating chamber 67 through the opening 64b so that the phase wire connecting portion 29a is located on the conductive member insertion hole 66 side.

The outer surface of one of the four side walls of the case member 61 is a curved surface 63b that is concavely curved toward the inside of the case member 61. The curved surface 63b is a surface extending along the outer peripheral surface of the stator core 25. The connector 40 of the present embodiment is arranged in the motor accommodating chamber S3 so that the curved surface 63b is along the outer peripheral surface of the stator core 25.

The lid member 71 has a plate-shaped lid portion 72. The outer peripheral surface 72a of the lid portion 72 extends along the inner peripheral surface 63a of the side wall 63 forming the opening 64b. As shown in FIG. 3, the lid member 71 forms the terminal accommodating chamber S5 while closing the terminal accommodating hole 64 by fitting the lid portion 72 into the opening 64b of the case member 61. The outer peripheral surface 72a of the lid portion 72 faces the inner peripheral surface 63a of the side wall 63 forming the opening 64b. Further, the first end surface 72b of the lid portion 72 facing the terminal accommodating hole 64 faces the end surface 65a of the partition wall 65 on the opening 64b side. The thickness of the lid portion 72 is shorter than the distance between the end surface 65a on the opening 64b side of the partition wall 65 and the end surface 63c on the opening 64b side of the side wall 63. Therefore, the second end surface 72c of the lid portion 72 facing the outside of the cluster block 60 is located closer to the insertion hole 64a than the end surface 63c of the side wall 63. The lid portion 72 has three motor wiring insertion grooves 73 recessed in the outer peripheral surface 72a of the lid portion 72, and a phase wire bundle insertion recess 74.

As shown in FIGS. 3 and 5, in the cluster block 60, the groove 68 provided in the partition wall 65 is closed by the first end surface 72b of the lid portion 72. The internal communication passage 81 is formed by the groove 68 and the first end surface 72b of the lid portion 72. The insertion hole 64a of the terminal accommodating hole 64 and the phase wire accommodating chamber 67 communicate with each other by an internal communication passage 81 inside the cluster block 60.

Further, the inner peripheral surface 63a of the side wall 63 forming the opening 64b of each motor wiring insertion groove 73 and the terminal accommodating hole 64 is inserted with the motor wiring into which the tube member 30 into which the two motor wirings 27 are inserted is inserted. It constitutes the hole 82. The motor wiring insertion hole 82 is connected to each insertion hole 64a of the terminal accommodating hole 64. A tube member 30 penetrates through the motor wiring insertion hole 82. The end of the tube member 30 on the first connecting portion 51 side is located in the terminal accommodating chamber S5, and the opposite end is located in the motor accommodating chamber S3.

As shown in FIG. 3, the terminal accommodating chamber S5 communicates with the motor accommodating chamber S3 shown in FIG. 1 via the motor wiring insertion hole 82. In the present embodiment, the terminal accommodating chamber S5 communicates with the motor accommodating chamber S3 via a gap provided between the inner peripheral surface 30a of the tube member 30 and the two motor wirings 27. Therefore, the gap provided between the inner peripheral surface 30a of the tube member 30 and the two motor wirings 27 constitutes an outer communication passage 83 that communicates the inside and outside of the cluster block 60. Further, as shown in FIG. 5, the inner peripheral surface 63a of the side wall 63 forming the phase line bundle insertion recess 74 and the opening 64b constitutes a phase line bundle insertion portion 84 through which the phase line bundle 29 is inserted.

As shown in FIG. 2, the lid member 71 has a protruding portion 75 protruding from the second end surface 72c of the lid portion 72. The outer peripheral surface 75a of the protruding portion 75 is located slightly inward of the outer peripheral surface 72a of the lid portion 72. Therefore, a gap is formed between the inner peripheral surface 63a of the side wall 63 forming the opening 64b of the case member 61 and the outer peripheral surface 75a of the protruding portion 75 of the lid portion 72.

As shown in FIG. 6, the resin 90 is filled between the inner peripheral surface 63a of the side wall 63 forming the opening 64b and the outer peripheral surface 75a of the protruding portion 75. The resin 90 is, for example, an adhesive. Then, the resin 90 seals between the inner peripheral surface 63a of the side wall 63 forming the opening 64b and the outer peripheral surface 75a of the protruding portion 75, and the inner peripheral surface 63a of the side wall 63 forming the opening 64b. And the outer peripheral surface 75a of the protruding portion 75 are adhered to each other via the resin 90. Further, the resin 90 also flows into the phase wire accommodating chamber 67 via between the phase wire bundle 29 and the inner peripheral surface of the phase wire bundle insertion portion 84. As a result, the phase wire bundle insertion portion 84 is sealed, and the phase wire bundle 29 and the cluster block 60 are adhered to each other via the resin 90. Therefore, the phase wire accommodating chamber 67 communicates only through the internal communication passage 81, the terminal accommodating chamber S5, and the motor wiring insertion hole 82.

In the electric compressor 10 having the above configuration, when power is supplied from the motor drive circuit 20 to the electric motor 18 via each cable 20a, each conductive member 32, each connection terminal 50, and each motor wiring 27, the electric motor 18 Is driven, and the rotation of the rotating shaft 16 accompanying the driving of the electric motor 18 drives the compression unit 17 to compress the refrigerant by the compression unit 17.

The operation and effect of this embodiment will be described.
(1) The terminal accommodating chamber S5 and the phase wire accommodating chamber 67 communicate with each other by an internal communication passage 81. Therefore, the pressure in the terminal accommodating chamber S5 and the pressure in the phase wire accommodating chamber 67 sealed with the resin 90 are made uniform. Further, the terminal accommodating chamber S5 and the motor accommodating chamber S3 are communicated with each other by an external communication passage 83. Therefore, the pressure in the terminal accommodating chamber S5 and the pressure in the motor accommodating chamber S3 are made uniform. That is, the pressure in the phase wire accommodating chamber 67 is made uniform with the pressure in the motor accommodating chamber S3 via the internal communication passage 81, the terminal accommodation chamber S5, and the external communication passage 83. Therefore, it is possible to suppress the occurrence of a pressure difference inside and outside the cluster block 60. As a result, damage to the cluster block 60 caused by a pressure difference between the inside and outside of the cluster block 60 can be suppressed.

(2) When the refrigerant containing the lubricating oil enters the terminal accommodating chamber S5, the lubricating oil can be a conductor that conducts the tip of the connection terminal 50 and the motor wiring 27 and the motor housing 12. Therefore, there is a risk that the insulation between the connection terminal 50 and the motor wiring 27 and the motor housing 12 cannot be ensured. On the other hand, since the opening 64b of the terminal accommodating hole 64 is closed by the lid portion 72, it becomes difficult for the refrigerant containing the lubricating oil to enter the terminal accommodating chamber S5. Therefore, insulation between the tip of the connection terminal 50 and the motor wiring 27 and the motor housing 12 can be ensured.

Further, the motor wiring insertion hole 82 is formed by assembling the case member 61 and the lid member 71. Therefore, for example, as compared with the case where the through hole penetrating the lid portion 72 is the motor wiring insertion hole 82, the motor wiring insertion hole 82 can be easily formed, and the tube member 30 can be formed with respect to the motor wiring insertion hole 82. Easy to insert.

(3) The refrigerant containing the lubricating oil may enter the cluster block 60 via the external communication passage 83. The lubricating oil can be a conductor that conducts the tip of the connection terminal 50 and the motor wiring 27 and the motor housing 12. Therefore, there is a risk that insulation between the tip of the connection terminal 50 and the motor wiring 27 and the motor housing 12 cannot be ensured. It is generally known that the resistance of a conductor is proportional to the length of the conductor. That is, the longer the length of the conductor, the smaller the resistance of the conductor. Therefore, the longer the distance (insulation distance between the connection terminal 50 and the motor housing 12) that the connection terminal 50 and the motor housing 12 conduct with each other via the lubricating oil, the better the insulation between the connection terminal 50 and the motor housing 12. Can be enhanced. The insulation distance between the connection terminal 50 and the motor housing 12 corresponds to the external communication passage 83.

When the tube member 30 is omitted and the gap between the inner peripheral surface of the motor wiring insertion hole 82 and the motor wiring 27 is the external communication passage 83, the distance through which the lubricating oil passes through the external communication passage 83 is the lid portion 72. Matches the thickness of. On the other hand, in the present embodiment, the gap between the inner peripheral surface 30a of the tube member 30 and the motor wiring 27 is the external communication passage 83. Therefore, the distance through which the lubricating oil passes through the external communication passage 83 coincides with the length of the tube member 30. The length of the tube member 30 is longer than the thickness of the lid portion 72. Therefore, the resistance of the refrigerant containing the lubricating oil passing through the external communication passage 83 is higher than that in the case where the gap between the inner peripheral surface of the motor wiring insertion hole 82 and the motor wiring 27 is the external communication passage 83. As a result, the insulation between the tip of the connection terminal 50 and the motor wiring 27 and the motor housing 12 can be improved.

(4) For example, it is conceivable that the phase wire accommodating chamber 67 and the motor accommodating chamber S3 are communicated with each other by forming a through hole in the side wall 63 of the case member 61. The refrigerant containing the above invades the phase wire accommodating chamber 67. Then, the lubricating oil can be a conductor that conducts the phase wire connecting portion 29a of the phase wire bundle 29 and the motor housing 12. Therefore, there is a possibility that the insulation between the phase wire connecting portion 29a of the phase wire bundle 29 and the motor housing 12 cannot be secured.

In the present embodiment, the phase wire accommodating chamber 67 communicates with the motor accommodating chamber S3 via the internal communication passage 81, the terminal accommodating chamber S5, and the external communication passage 83. Therefore, the main path through which the refrigerant containing the lubricating oil can enter the inside of the cluster block 60 is only the external communication passage 83. Therefore, the insulation between the phase wire connecting portion 29a of the phase wire bundle 29 and the motor housing 12 can be improved.

This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
○ The conductive member insertion hole 66 may be provided in the side wall 63 of the case member 61. In this case, the axial direction of the square cylinder of the second connecting portion 52 is orthogonal to the longitudinal direction of the first connecting portion 51. That is, the insertion direction of the conductive member 32 with respect to the second connection portion 52 of the connection terminal 50 is orthogonal to the longitudinal direction of the first connection portion 51.

○ The arrangement of the insertion holes 64a and the phase wire accommodating chamber 67 in the case member 61 of the cluster block 60 may be appropriately changed. For example, the insertion holes 64a and the phase line accommodating chamber 67 may be arranged side by side in a straight line.

○ The lid member 71 may have a configuration in which the protruding portion 75 is omitted.
○ The configuration of the internal communication passage 81 may be changed as appropriate. The internal communication passage 81 may be, for example, a through hole penetrating a portion of the partition wall 65 that partitions the terminal accommodating chamber S5 and the phase line accommodating chamber 67. Further, the internal communication passage 81 may communicate the insertion hole 64a located on the end side of the three insertion holes 64a arranged side by side with the phase line accommodating chamber 67. Further, the number of internal communication passages 81 is not limited to one. For example, three internal communication passages 81 may be provided so that each insertion hole 64a and the phase line accommodating chamber 67 communicate with each other.

○ The configuration of each motor wiring insertion hole 82 may be changed as appropriate. Each motor wiring insertion hole 82 may be, for example, a through hole penetrating the lid portion 72.
○ The configuration of the phase wire bundle insertion portion 84 may be changed as appropriate. The phase wire bundle insertion portion 84 may be, for example, a through hole penetrating the lid portion 72.

○ The tube member 30 may be omitted. In this case, a gap is provided between the inner peripheral surface of the motor wiring insertion hole 82 and the motor wiring 27 as the external communication passage 83.
○ The number of phases of the coil 26 may be changed.

○ The number of conducting wires forming the coil 26 may be one or three or more.
○ The number of motor wirings 27 inserted into one tube member 30 may be changed according to the number of conducting wires forming the coil 26. However, the inner diameter of the tube member 30 and the outer diameter of the motor wiring 27 inserted into the tube member 30 are set so that a gap is provided between the inner peripheral surface 30a of the tube member 30 and the motor wiring 27.

The number of insertion holes 64a in the terminal accommodating holes 64 of the case member 61 may be appropriately changed according to the number of phases of the coil 26.
○ The case member 61 may have a configuration in which the partition wall 65 is omitted. In this case, the three insertion holes 64a and the opening 64b are integrated, and the terminal accommodating hole 64 becomes one space in which the three connection terminals 50 are accommodated.

The number of the conductive member insertion holes 66 of the case member 61 may be changed according to the number of phases of the coil 26.
○ The number of motor wiring insertion holes 82 in the cluster block 60 may be appropriately changed according to the number of phases of the coil 26.

○ The compression unit 17 is not limited to the type composed of the fixed scroll 17a and the movable scroll 17b, and may be changed to, for example, a piston type or a vane type.

10 ... Electric compressor, 11 ... Housing, 17 ... Compressor, 18 ... Electric motor, 20 ... Motor drive circuit, 26 ... Coil, 27 ... Motor wiring, 28 ... Phase wire, 29a ... Phase wire connection, 30 ... Tube Member, 32 ... Conductive member, 50 ... Connection terminal, 60 ... Cluster block, 61 ... Case member, 64 ... Terminal accommodating hole, 64b ... Opening, 67 ... Phase wire accommodating chamber, 71 ... Lid member, 81 ... Internal communication passage , 82 ... Motor wiring insertion hole, S3 ... Motor accommodation chamber, S5 ... Terminal accommodation chamber.

Claims (3)

A compression part that compresses the refrigerant and
An electric motor that drives the compression unit and has a multi-phase coil,
The motor drive circuit that drives the electric motor and
A conductive member electrically connected to the motor drive circuit,
The motor wiring drawn from each phase of the multi-phase coil and
A phase wire connection portion in which phase wires drawn from each phase of the multi-phase coil are electrically connected to each other, and a phase wire connection portion.
A connection terminal that electrically connects the motor wiring and the conductive member,
An insulating cluster block that houses the connection terminals inside,
A housing forming a motor accommodation chamber for accommodating the electric motor and the cluster block,
With
The cluster block has a terminal accommodating chamber for accommodating the connection terminal and a motor wiring insertion hole through which the motor wiring is inserted.
The terminal accommodating chamber is an electric compressor communicating with the motor accommodating chamber through the motor wiring insertion hole.
The cluster block has a phase wire accommodating chamber accommodating the phase wire connecting portion and an internal communication passage communicating the phase wire accommodating chamber and the terminal accommodating chamber.
An electric compressor characterized in that the phase wire accommodating chamber and the motor accommodating chamber communicate only through the internal communication passage, the terminal accommodating chamber, and the motor wiring insertion hole. The cluster block includes a case member having a terminal accommodating hole for accommodating the connection terminal, and a lid member for forming the terminal accommodating chamber while fitting into the opening so as to close the opening of the terminal accommodating hole. ,
The electric compressor according to claim 1, wherein the motor wiring insertion hole is formed between an inner peripheral surface of the terminal accommodating hole and an outer peripheral surface of the lid member. An insulating tube member that covers the motor wiring and is inserted into the motor wiring insertion hole is provided.
The electric compressor according to claim 1 or 2, wherein the terminal accommodating chamber communicates with the motor accommodating chamber through a gap between the inside of the tube member and the motor wiring.

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