JP2018168832A - Electric compressor - Google Patents

Abstract

To avoid contact between a cluster block and a rotor.SOLUTION: In an axial line direction of a rotation shaft 14, a gap S1 between a stator opposing part 45 and an end of a stator 22 is smaller than a gap S2 between a rotor opposing part 44 and an end of a rotor 21. Thereby, even when a cluster block 40 moves toward an electric motor 20 in the axial line direction of the rotation shaft 14, the stator opposing part 45 comes into contact with the end of the stator 22 before the rotor opposing part 44 of the cluster block 40, so that the contact between the cluster block 40 and the rotor 21 can be avoided.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electric compressor including a compression unit that compresses a fluid, an electric motor that rotates a rotating shaft, and a drive circuit that drives the electric motor.

  The housing of the electric compressor houses a compression unit and an electric motor. The electric motor includes a cylindrical stator and a rotor arranged inside the stator. The stator has a stator core and a coil wound around the stator core. An annular coil end protrudes from an end surface of the stator core in the axial direction of the rotating shaft. Motor wiring is drawn out from the coil end. A through hole is formed in the housing. A conductive member is inserted through the through hole. One end of the conductive member is electrically connected to the drive circuit.

  A connector for connecting the motor wiring and the circuit wiring is disposed in the housing. The connector includes a connection terminal connected to the motor wiring and electrically connected to the other end of the conductive member, and an insulating cluster block that accommodates the connection terminal inside. When electric power is supplied from the drive circuit to the electric motor via the conductive member, the connection terminal, and the motor wiring, the electric motor is driven, and the compression unit is driven by the rotation of the rotating shaft accompanying the driving of the electric motor as fluid. The refrigerant is compressed by the compression unit.

  For example, in the electric compressor of Patent Document 1, the other end of the conductive member is located inside the coil end of the stator as viewed from the axial direction of the rotating shaft, and a part of the cluster block is located on the inner peripheral side of the coil end. positioned. According to this, the size of the electric compressor can be reduced.

JP 2014-34918 A

  However, as in Patent Document 1, when a part of the cluster block is located on the inner peripheral side of the coil end, the cluster block moves to the electric motor side in the axial direction of the rotating shaft due to vibration during traveling of the vehicle. The cluster block may come into contact with the rotor due to movement. If the rotor rotates while the cluster block is in contact with the rotor, an abnormal noise will be generated.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an electric compressor capable of avoiding contact between a cluster block and a rotor.

  An electric compressor that solves the above-described problems is a housing, a rotating shaft that is housed in the housing, an electric motor that is housed in the housing and rotates the rotating shaft, and is housed in the housing. A compression unit that is driven by the rotation of the rotating shaft to compress the fluid; and a drive circuit that drives the electric motor, the electric motor being disposed inside the cylindrical stator and the stator. The stator includes a stator core, and a coil end protruding from an end surface of the stator core in the axial direction of the rotation shaft, and is formed in the housing and motor wiring drawn out from the coil end. A conductive member inserted into the through-hole and having one end electrically connected to the drive circuit, and the housing And a connector for connecting the motor wiring and the conductive member, wherein the connector is connected to the motor wiring and electrically connected to the other end of the conductive member. A connecting terminal connected to the insulating terminal, and an insulating cluster block that accommodates the connecting terminal therein. The cluster block includes a conductive member insertion hole into which the conductive member is inserted, and the motor. A motor wiring insertion hole through which wiring is inserted, and the other end of the conductive member is located inside the stator as viewed from the axial direction of the rotating shaft, and the cluster block is In the state where the other end of the conductive member is inserted into the conductive member insertion hole and electrically connected to the connection terminal, the end of the rotor in the axial direction of the rotation shaft And a stator facing portion facing the end of the stator in the axial direction of the rotating shaft, and the stator facing portion and the end of the stator in the axial direction of the rotating shaft. Is smaller than the gap between the rotor facing portion and the end of the rotor.

  According to this, even when the cluster block moves to the electric motor side in the axial direction of the rotating shaft, the stator facing portion comes into contact with the end portion of the stator before the rotor facing portion of the cluster block. Can be avoided.

  In the electric compressor, in the state where the other end of the conductive member is inserted into the conductive member insertion hole and is electrically connected to the connection terminal, the motor wiring insertion hole is in the axial direction of the rotation shaft. As seen from the above, it should be in a position overlapping the coil end.

  According to this, a part of the cluster block can be a stator facing portion that faces the end of the coil end of the stator in the axial direction of the rotating shaft. Therefore, since the stator facing portion facing the end of the stator in the axial direction of the rotating shaft is not newly provided in the cluster block, the existing portion in the cluster block is functioned as the stator facing portion. The configuration can be simplified.

In the electric compressor, the insertion direction of the conductive member with respect to the conductive member insertion hole and the insertion direction of the motor wiring with respect to the motor wiring insertion hole may be orthogonal to each other.
According to this, compared to the case where the insertion direction of the conductive member with respect to the conductive member insertion hole and the insertion direction of the motor wiring with respect to the motor wiring insertion hole are obliquely crossed, the insertion into the conductive member insertion hole in the conductive member, and The motor wiring can be easily inserted into the motor wiring insertion hole. Further, the shape of the cluster block can facilitate the management of the gap between the stator facing portion and the end portion of the stator and the gap between the rotor facing portion and the end portion of the rotor.

  According to the present invention, contact between the cluster block and the rotor can be avoided.

A side sectional view showing an electric compressor in an embodiment. The sectional side view which expands and shows a part of electric compressor.

Hereinafter, an embodiment embodying an electric compressor will be described with reference to FIGS. 1 and 2. The electric compressor of this embodiment is used for a vehicle air conditioner.
As shown in FIG. 1, the housing 11 of the electric compressor 10 includes a bottomed cylindrical discharge housing 12 and a bottomed cylindrical motor housing 13 connected to the discharge housing 12. The discharge housing 12 and the motor housing 13 are made of a metal material (for example, aluminum). The motor housing 13 has a bottom wall 13e and a side wall 13a extending in a cylindrical shape from the outer peripheral edge of the bottom wall 13e.

  A rotating shaft 14 is accommodated in the motor housing 13. Further, in the motor housing 13, there are a compression unit 15 that is driven by rotation of the rotating shaft 14 to compress the refrigerant as a fluid, and an electric motor 20 that rotates the rotating shaft 14 to drive the compression unit 15. Contained. The compression unit 15 and the electric motor 20 are arranged side by side in the axial direction, which is the direction in which the rotation axis L of the rotation shaft 14 extends. The electric motor 20 is disposed closer to the bottom wall 13 e of the motor housing 13 than the compression unit 15.

  A shaft support member 16 is provided between the compression unit 15 and the electric motor 20 in the motor housing 13. An insertion hole 16 h through which one end of the rotating shaft 14 is inserted is formed at the center of the shaft support member 16. A bearing 17 a is provided between the insertion hole 16 h and one end of the rotating shaft 14. One end of the rotating shaft 14 is rotatably supported by the shaft support member 16 via a bearing 17a.

  A cylindrical bearing portion 18 protrudes from the bottom wall 13 e of the motor housing 13. The other end of the rotating shaft 14 is inserted inside the bearing portion 18. A bearing 17 b is provided between the bearing portion 18 and the other end of the rotating shaft 14. The other end of the rotating shaft 14 is rotatably supported by the bearing portion 18 via a bearing 17b.

  The compression unit 15 includes a fixed scroll 15a fixed to the motor housing 13 and a movable scroll 15b disposed to face the fixed scroll 15a. The fixed scroll 15a and the movable scroll 15b mesh with each other. A compression chamber 15c whose volume can be changed is defined between the fixed scroll 15a and the movable scroll 15b.

  A bottomed cylindrical cover 19 is attached to the bottom wall 13 e of the motor housing 13. The bottom wall 13e of the motor housing 13 and the cover 19 form an accommodation space 19a that accommodates a drive circuit 30 that drives the electric motor 20. The bottom wall 13e of the motor housing 13 is a part of the housing 11 and functions as a partition that separates the inside of the housing 11 from the accommodation space 19a. The compression unit 15, the electric motor 20, and the drive circuit 30 are arranged side by side in the axial direction of the rotating shaft 14 in this order.

  The electric motor 20 includes a cylindrical stator 22 and a rotor 21 disposed inside the stator 22. The rotor 21 rotates integrally with the rotating shaft 14. The stator 22 surrounds the rotor 21. The rotor 21 has a rotor core 21a fixed to the rotating shaft 14 and a plurality of permanent magnets (not shown) provided on the rotor core 21a. The stator 22 has a cylindrical stator core 23 and a coil 24 wound around the stator core 23. Further, the stator 22 has an annular coil end 24 e that protrudes from both end faces 23 e in the axial direction of the rotating shaft 14 in the stator core 23. The coil end 24 e is a part of the coil 24.

  A suction port 13h is formed in the side wall 13a. The suction port 13 h sucks the refrigerant into the motor housing 13. The suction port 13h is disposed between the end wall 23e on the bottom wall 13e side of the motor housing 13 and the bottom wall 13e in the stator core 23 in the axial direction of the rotary shaft 14. The suction port 13h is connected to an external refrigerant circuit (not shown).

  A discharge chamber 12 a is formed in the discharge housing 12. The discharge housing 12 is formed with a discharge port 12h communicating with the discharge chamber 12a. The discharge port 12h is connected to an external refrigerant circuit.

  The refrigerant sucked into the motor housing 13 from the suction port 13h is sucked into the compression chamber 15c by the turning (suction operation) of the movable scroll 15b. The refrigerant in the compression chamber 15c is compressed by the turning (discharging operation) of the movable scroll 15b and discharged to the discharge chamber 12a. The refrigerant discharged into the discharge chamber 12a flows out to the external refrigerant circuit through the discharge port 12h and returns to the motor housing 13 through the suction port 13h.

  Three motor wires 28 are drawn out from the coil end 24e disposed opposite to the bottom wall 13e of the motor housing 13 so as to correspond to the U-phase, V-phase, and W-phase coils 24. Each motor wiring 28 is drawn from the coil end 24e in a state where a part of the coil 24 drawn from the coil end 24e is covered with an insulating tube. The three motor wires 28 are drawn from the coil end 24e so that the directions extending in the circumferential direction of the rotating shaft 14 are the same.

  A through hole 13 b is formed in the bottom wall 13 e of the motor housing 13. The through hole 13b is formed at a position facing the inner peripheral side of the coil end 24e in the axial direction of the rotating shaft 14 with respect to the bottom wall 13e.

  An airtight terminal 31 is provided in the through hole 13b. The hermetic terminal 31 includes three conductive members 32 corresponding to the U-phase, V-phase, and W-phase coils 24. Each conductive member 32 is a cylindrical metal terminal extending linearly. Each conductive member 32 is inserted into the through hole 13 b and one end thereof is electrically connected to the drive circuit 30. The other end of each conductive member 32 protrudes from the accommodation space 19a into the motor housing 13 through the through hole 13b.

  The airtight terminal 31 has a support plate 33 that supports each conductive member 32. Each conductive member 32 is supported by the support plate 33 while penetrating the support plate 33. A glass insulating member (not shown) is interposed between each conductive member 32 and the support plate 33. The support plate 33 is disposed in the accommodation space 19a, and is attached to the periphery of the through hole 13b on the outer surface of the bottom wall 13e by a screw (not shown).

  A connector 39 is disposed in the motor housing 13. The connector 39 connects the motor wiring 28 and the conductive member 32. The connector 39 includes a connection terminal 41 and an insulating cluster block 40 made of a resin that accommodates the connection terminal 41 therein. The cluster block 40 is a housing for the connector 39. The connection terminal 41 is electrically connected to the other end of the conductive member 32. The cluster block 40 accommodates three connection terminals 41 corresponding to the U-phase, V-phase, and W-phase coils 24. The connection terminal 41 electrically connects the motor wiring 28 and the conductive member 32.

As shown in FIG. 2, the cluster block 40 is formed with a conductive member insertion hole 43 into which the conductive member 32 is inserted and a motor wiring insertion hole 42 through which the motor wiring 28 is inserted.
The cluster block 40 is disposed in the motor housing 13 such that the motor wiring insertion hole 42 is opened toward the inner peripheral surface of the motor housing 13. The cluster block 40 is disposed in the motor housing 13 such that the conductive member insertion hole 43 extends in the axial direction of the rotating shaft 14.

  The other end of the conductive member 32 is located inside the coil end 24 e of the stator 22 when viewed from the axial direction of the rotating shaft 14. The conductive member insertion hole 43 is disposed at a position facing the inner peripheral side of the coil end 24e in the axial direction of the rotary shaft 14, and a part of the cluster block 40 is positioned on the inner peripheral side of the coil end 24e. . The cluster block 40 is configured such that the other end of the conductive member 32 is inserted into the conductive member insertion hole 43 and electrically connected to the connection terminal 41, and the end portion of the rotor 21 in the axial direction of the rotary shaft 14. And a rotor facing portion 44 facing each other. In the present embodiment, the “end portion of the rotor 21” is the end portion of the rotor core 21 a that faces the bottom wall 13 e of the motor housing 13 in the axial direction of the rotating shaft 14.

  When the other end of the conductive member 32 is inserted into the conductive member insertion hole 43 and electrically connected to the connection terminal 41, the motor wiring insertion hole 42 has a coil end when viewed from the axial direction of the rotary shaft 14. It is in a position overlapping with 24e. The cluster block 40 has a stator facing portion 45 that faces the end portion of the stator 22 in the axial direction of the rotating shaft 14. In the present embodiment, the “end portion of the stator 22” is the end portion of the coil end 24 e that faces the bottom wall 13 e of the motor housing 13 in the axial direction of the rotating shaft 14.

  Most of the cluster block 40 is between the coil end 24e and the bottom wall 13e of the motor housing 13 in the axial direction of the rotating shaft 14, and is on the inner peripheral side of the coil end 24e in the axial direction of the rotating shaft 14. It is arrange | positioned in the position facing. In the axial direction of the rotating shaft 14, the clearance S <b> 1 between the stator facing portion 45 and the end portion of the stator 22 is smaller than the clearance S <b> 2 between the rotor facing portion 44 and the end portion of the rotor 21.

  The motor wiring 28 is inserted into the cluster block 40 through the motor wiring insertion hole 42 and connected to the connection terminal 41. The conductive member 32 is inserted into the cluster block 40 through the conductive member insertion hole 43 and connected to the connection terminal 41. Thus, the motor wiring 28 and the conductive member 32 are electrically connected via the connection terminal 41. The insertion direction of the conductive member 32 with respect to the conductive member insertion hole 43 and the insertion direction of the motor wiring 28 with respect to the motor wiring insertion hole 42 are orthogonal to each other.

  The electric power controlled by the drive circuit 30 is supplied to the electric motor 20 via the conductive member 32, the connection terminal 41 and the motor wiring 28. Thereby, the electric motor 20 is driven, and the rotation of the rotating shaft 14 accompanying the driving of the electric motor 20 drives the compression unit 15 so that the refrigerant is compressed by the compression unit 15.

Next, the operation of this embodiment will be described.
For example, it is assumed that the cluster block 40 moves to the electric motor 20 side in the axial direction of the rotary shaft 14 due to vibration during traveling of the vehicle. At this time, the gap S1 between the stator facing portion 45 and the end portion of the stator 22 in the axial direction of the rotating shaft 14 is smaller than the gap S2 between the rotor facing portion 44 and the end portion of the rotor 21, and thus the rotor facing portion 44. The stator facing portion 45 comes into contact with the end portion of the stator 22 earlier. Thereby, contact with the cluster block 40 and the rotor 21 is avoided.

In the above embodiment, the following effects can be obtained.
(1) In the axial direction of the rotating shaft 14, the clearance S <b> 1 between the stator facing portion 45 and the end portion of the stator 22 is smaller than the clearance S <b> 2 between the rotor facing portion 44 and the end portion of the rotor 21. According to this, even when the cluster block 40 moves toward the electric motor 20 in the axial direction of the rotating shaft 14, the stator facing portion 45 contacts the end portion of the stator 22 before the rotor facing portion 44 of the cluster block 40. Therefore, contact between the cluster block 40 and the rotor 21 can be avoided.

  (2) The motor wiring insertion hole 42 is located at a position overlapping the coil end 24e when viewed from the axial direction of the rotary shaft 14. Thereby, a part of the cluster block 40 serves as a stator facing portion 45 that faces the end portion of the stator 22 in the axial direction of the rotating shaft 14. Therefore, a stator facing portion that faces the end of the stator 22 in the axial direction of the rotating shaft 14 is not newly provided in the cluster block 40, but an existing part of the cluster block 40 is made to function as the stator facing portion 45. Therefore, the configuration of the cluster block 40 can be simplified.

  (3) The insertion direction of the conductive member 32 with respect to the conductive member insertion hole 43 and the insertion direction of the motor wiring 28 with respect to the motor wiring insertion hole 42 are orthogonal to each other. According to this, compared with the case where the insertion direction of the conductive member 32 with respect to the conductive member insertion hole 43 and the insertion direction of the motor wiring 28 with respect to the motor wiring insertion hole 42 are obliquely crossed, the conductive member insertion in the conductive member 32 is performed. The insertion into the hole 43 and the insertion into the motor wiring insertion hole 42 in the motor wiring 28 can be facilitated. Further, the shape of the cluster block 40 can be easily managed for the gap S1 between the stator facing portion 45 and the end of the stator 22 and the gap S2 between the rotor facing portion 44 and the end of the rotor 21. .

  (4) According to the present embodiment, since the contact between the cluster block 40 and the rotor 21 is avoided, the rotor 21 rotates in a state where the cluster block 40 is in contact with the rotor 21, and noise is generated. You can avoid that.

In addition, you may change the said embodiment as follows.
In the embodiment, the insertion direction of the conductive member 32 with respect to the conductive member insertion hole 43 and the insertion direction of the motor wiring 28 with respect to the motor wiring insertion hole 42 may cross each other.

  In the embodiment, the end of the stator 22 may be a part of an insulator that insulates the stator core 23 and the coil 24, or may be an end of a cover member that protects the coil end 24e.

In the embodiment, the end portion of the rotor 21 may be an end portion of a balance weight of the rotor 21 or a rivet end portion that fastens the balance weight.
In the embodiment, the numbers of the motor wiring 28, the conductive member 32, and the connection terminal 41 are not particularly limited.

  In the embodiment, the compression unit 15, the electric motor 20, and the drive circuit 30 may not be arranged along the rotation axis L of the rotation shaft 14 in this order. For example, the cover 19 may be attached to the side wall 13 a of the motor housing 13, and the drive circuit 30 may be accommodated in a space defined by the side wall 13 a of the motor housing 13 and the cover 19.

  In embodiment, the compression part 15 is not restricted to the type comprised by the fixed scroll 15a and the movable scroll 15b, For example, you may change into a piston type, a vane type, etc.

In embodiment, the compression part 15 may compress the air as a fluid, for example.
(Circle) in embodiment, the electric compressor 10 may not be used for a vehicle air conditioner, and may be used for another air conditioner.

  DESCRIPTION OF SYMBOLS 10 ... Electric compressor, 11 ... Housing, 13b ... Through-hole, 14 ... Rotating shaft, 15 ... Compression part, 20 ... Electric motor, 21 ... Rotor, 22 ... Stator, 23 ... Stator core, 23e ... End face, 24e ... Coil end , 28 ... motor wiring, 30 ... drive circuit, 32 ... conductive member, 39 ... connector, 40 ... cluster block, 41 ... connection terminal, 42 ... motor wiring insertion hole, 43 ... conductive member insertion hole, 44 ... rotor facing part, 45: Stator facing portion.

Claims (3)

A housing;
A rotating shaft housed in the housing;
An electric motor housed in the housing and rotating the rotating shaft;
A compressing unit that is housed in the housing and that is driven by the rotation of the rotating shaft to compress the fluid;
A drive circuit for driving the electric motor,
The electric motor comprises a cylindrical stator and a rotor disposed inside the stator,
The stator has a stator core, and a coil end protruding from an end surface of the stator core in the axial direction of the rotating shaft,
Motor wiring drawn from the coil end;
A conductive member inserted into a through-hole formed in the housing and electrically connected at one end to the drive circuit;
An electric compressor provided with a connector that is disposed in the housing and connects the motor wiring and the conductive member,
The connector is
A connection terminal connected to the motor wiring and electrically connected to the other end of the conductive member;
An insulating cluster block that accommodates the connection terminal therein, and
The cluster block has a conductive member insertion hole into which the conductive member is inserted and a motor wiring insertion hole into which the motor wiring is inserted.
The other end of the conductive member is located inside the stator as viewed from the axial direction of the rotating shaft,
The cluster block is
A rotor facing portion facing the end of the rotor in the axial direction of the rotating shaft in a state where the other end of the conductive member is inserted into the conductive member insertion hole and electrically connected to the connection terminal; A stator facing portion facing the end portion of the stator in the axial direction of the rotating shaft,
In the axial direction of the rotating shaft, the gap between the stator facing portion and the end of the stator is smaller than the gap between the rotor facing portion and the end of the rotor.   When the other end of the conductive member is inserted into the conductive member insertion hole and is electrically connected to the connection terminal, the motor wiring insertion hole is viewed from the axial direction of the rotating shaft, and the coil The electric compressor according to claim 1, wherein the electric compressor is located at a position overlapping with the end.   3. The electric compressor according to claim 1, wherein an insertion direction of the conductive member with respect to the conductive member insertion hole and an insertion direction of the motor wiring with respect to the motor wiring insertion hole are orthogonal to each other. .