JP2010180796A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor uniformly cooling a stator of an electric motor. <P>SOLUTION: The electric compressor 1 includes a compression mechanism part 2 housed in a middle housing 5 for compressing refrigerant 25, and a motor part 3 rotating the compression mechanism part 2. The compression mechanism part 2 includes a rotor 9 rotated by receiving a rotating drive force from the motor part 3, a cylinder block 10 housing the rotor 9, a rear side block 11 fixed to an end side of the cylinder block 10, and a front side block 12 fixed to another end side of the cylinder block 10. A refrigerant passage 13 along the circumferential direction is arranged between the middle housing 5 and the rear side block 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric compressor.

  As shown in FIG. 7, a conventional electric gas compressor 100 (hereinafter referred to as “electric compressor 100”) compresses a refrigerant and controls the driving of the compression mechanism unit 102 and the compression mechanism unit 102 accommodated in the middle housing 101. And a motor unit 104 that rotationally drives the compression mechanism unit 102.

  The compression mechanism unit 102 includes a rotor 105 that rotates in response to a rotational driving force from the motor unit 104, a cylinder block 106 that houses the rotor 105, a rear side block 107 that is fixed to one end of the cylinder block 106, and a cylinder block 106. The front side block 108 is fixed to the other end of the front side block 108.

  As shown in FIG. 8, the rear side block 107 is provided with two refrigerant introduction paths 109 and 109, and the refrigerant passes through the refrigerant introduction paths 109 and 109 provided in the rear side block 107. FIG. 9 shows the middle housing 101, and a refrigerant introduction / discharge passage 110 is formed so that the refrigerant introduction passages 109, 109 of the rear side block 107 face each other.

FIG. 10 shows the motor unit 104 accommodated in the rear housing 111, and the refrigerant 112 that has passed through the refrigerant introduction paths 109 and 109 and the refrigerant introduction / discharge path 110 of the rear side block 107 in this order is the inner peripheral surface of the rear housing 111. Are blown to the stator 113 arranged at equal intervals along the line. Thereby, the stator 113 is cooled by the refrigerant 112.
Patent Document 1 shown below describes an electric gas compressor having a flow path for exchanging heat with a motor in the compressor.

JP 2005-344657 A

  However, in the conventional electric compressor, the refrigerant introduction paths 109 and 109 are provided only in two places with respect to the nine stators 113, so that the flow of the refrigerant 112 with respect to the stator 113 is biased as shown in FIG. As a result, the cooling medium 112 cannot be sprayed uniformly on all the stators 113 to cool them.

  As a result, under the condition that a large load is applied to the electric compressor, there is a problem that the temperature of the stator which is insufficiently cooled increases and the performance of the electric compressor is lowered.

  Accordingly, an object of the present invention is to provide an electric compressor capable of uniformly cooling a stator of an electric motor in order to solve the above-described problems.

  The electric compressor according to claim 1 includes a compression mechanism portion that compresses the refrigerant and is accommodated in the middle housing, and a motor portion that rotationally drives the compression mechanism portion. The compression mechanism portion is a rotational driving force from the motor portion. An electric compressor comprising: a rotor that receives and rotates; a cylinder block that houses the rotor; a rear side block that is fixed to one end of the cylinder block; and a front side block that is fixed to the other end of the cylinder block. Further, a refrigerant passage along the circumferential direction is provided between the middle housing and the rear side block.

  The electric compressor according to a second aspect is the electric compressor according to the first aspect, wherein the refrigerant passage is provided in the entire circumferential direction.

  The electric compressor according to a third aspect is the electric compressor according to the first aspect, wherein the refrigerant passages are provided at equal intervals in the circumferential direction.

  According to a fourth aspect of the present invention, there is provided the electric compressor according to the first aspect, wherein a long hole is provided in a circumferential direction of a bottom surface portion of the middle housing.

  In the present invention, by providing a refrigerant passage along the circumferential direction between the middle housing and the rear side block, the refrigerant can be sprayed in the circumferential direction of the stator of the motor unit, and the stator can be uniformly cooled. it can.

The whole sectional view of an electric compressor. AA sectional view taken on the line AA of FIG. The perspective view of a rear side block. The perspective view of a middle housing. The perspective view of a rear housing. (A) is a horizontal view of (b), (b) is a top view of a cylinder block. The whole electric compressor sectional view. The perspective view of the conventional rear side block. The perspective view of the conventional middle housing. The perspective view of the conventional rear housing.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the electric compressor 1 of the present embodiment includes a compression mechanism portion 2 that compresses the refrigerant 25 and is accommodated in the middle housing 5, a drive circuit portion 4 that controls driving of the compression mechanism portion 2, and a compression And a motor unit 3 that rotationally drives the mechanism unit 2.

  The compression mechanism section 2 includes a rotor 9 that rotates by receiving a rotational driving force from the motor section 3, a cylinder block 10 that houses the rotor 9, a rear side block 11 that is fixed to one end of the cylinder block 10, and a cylinder. The front side block 12 is fixed to the other end of the block 10. In the electric compressor 1 of the present embodiment, a refrigerant passage 13 is provided between the middle housing 5 and the rear side block 11 along the circumferential direction.

  The electric compressor 1 is used in a cooling system for a vehicle air conditioner. The high-temperature and high-pressure refrigerant 25 adiabatically compressed by the electric compressor 1 is liquefied by a condenser, expanded by an expansion valve, and expanded by an evaporator. Heat exchange is performed, and it is heated and vaporized while producing cold air, and returns to the electric compressor 1 to be adiabatically compressed. The discharge amount of the electric compressor 1 is adjusted according to a change in the heat load of the cooling system.

  As shown in FIG. 1, the electric compressor 1 includes a front housing 7 in which the drive circuit portion 4 is accommodated and a rear housing 6 in which the motor portion 3 is accommodated adjacent to the middle housing 5. The housing 7 and the middle housing 5 and the middle housing 5 and the rear housing 6 are respectively fixed by bolts or the like.

  As shown in FIG. 4, the middle housing 5 has a hole 14 into which a rear side block 11 described later is press-fitted, and a middle housing bottom surface portion 5 a in which a long hole 15 through which the refrigerant 25 flows is formed in the motor portion 3. Is formed.

  As shown in FIG. 3, the rear side block 11 is driven at the center of the disc-shaped flat portion 16, a convex portion 17 that is press-fitted into the middle housing 5 and protrudes from the flat portion 16, and the center of the convex portion 17. A through hole 18 through which the shaft 8 is inserted is formed.

  The drive circuit section 4 in the front housing 7 is fixed to one end side of the middle housing 5 and controls the rotation speed of the compression mechanism section 2 in accordance with a change in the thermal load of the motor section 3.

  The motor unit 3 includes a motor shaft 19 connected to the drive shaft 8 that rotationally drives the compression mechanism unit 2, a motor rotor 23 that is press-fitted and fixed to the motor shaft 19, and a plurality of motor units 3 that are arranged to cover the outer periphery of the motor rotor 23. And the stator 20. Both ends of the motor shaft 19 are supported by the middle housing 5 and the rear housing 6 by bearings 21 and 22, respectively. The stator 20 is formed by winding a coil around a ferromagnetic core. As shown in FIG. 5, nine stators 20 are fixed to the inner periphery of the rear housing 6 in the circumferential direction. .

  The rotation of the motor unit 3 is transmitted from the motor shaft 19 to the drive shaft 8 to drive the compression mechanism unit 2. The compression mechanism unit 2 discharges the compressed refrigerant 25 to the refrigerant passage 13, and the discharged refrigerant 25 is the middle housing. 5 passes between the inner periphery and the outer periphery of the rear side block 11, passes through the flow passage 24 and the long hole 15 between the rear side block 11 and the middle housing bottom surface portion 5a, and is blown toward the stator 20 to blow the stator 20 Cooling.

  In the present invention, since the refrigerant passage along the circumferential direction is provided between the middle housing and the rear side block in the entire circumferential direction, the refrigerant can be sprayed onto the stator without being biased. Can be cooled.

  Moreover, in this embodiment, although the refrigerant path was provided in the circumferential direction whole region, what is necessary is just the structure which can spray a refrigerant | coolant uniformly to a stator. For example, the structure which provides a refrigerant path in the circumferential direction equal interval of a rear side block may be sufficient. Moreover, you may provide a communicating hole continuously in the circumferential direction of a rear side block. Furthermore, the structure which provides a notch in the outer periphery of a cylinder block, and connects with a refrigerant path may be sufficient.

  The electric compressor 1 of 2nd Example is demonstrated using FIG. In addition, about the same component as the said 1st Example, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  As shown in FIG. 6, a first cutout portion 27 and a second cutout portion 28 are provided on the outer peripheral surface 26 a of the cylinder block 26. The first cutout 27 includes a front cutout 27a that decreases from one surface side to the other surface of the cylinder block 26, and an inner cutout deep in the radial direction of the cylinder block 26 toward the discharge port side from which the refrigerant is discharged. Part 27b.

  The second cutout portion 28 is disposed on the opposite side of the first cutout portion 27 through the refrigerant discharge port, and has an inner diameter cutout portion 28a that is reduced in diameter toward the inner diameter side of the outer peripheral surface 26a of the cylinder block 26. And an inner diameter wall portion 28 b that is reduced in the inner diameter direction of the cylinder block 26.

  By providing the first and second cutout portions 27 and 28, the refrigerant is dispersed in the middle housing, and the refrigerant can be sprayed more uniformly on the stator.

DESCRIPTION OF SYMBOLS 1 Electric compressor 2 Compression mechanism part 3 Motor part 4 Drive circuit part 5 Middle housing 9 Rotor 10 Cylinder block 11 Rear side block 12 Front side block 25 Refrigerant

Claims (4)

A compression mechanism (2) that compresses the refrigerant (25) and is accommodated in the middle housing (5); and a motor (3) that rotationally drives the compression mechanism (2).
The compression mechanism section (2) includes a rotor (9) that rotates by receiving a rotational driving force from the motor section (3), a cylinder block (10) that houses the rotor (9), and the cylinder block (10 And a front side block (12) fixed to the other end of the cylinder block (10), and an electric compressor (1) comprising: a rear side block (11) fixed to one end of the cylinder block (10);
An electric compressor (1) characterized in that a refrigerant passage (13) along the circumferential direction is provided between the middle housing (5) and the rear side block (11). An electric compressor (1) according to claim 1,
The electric compressor (1), wherein the refrigerant passage (13) is provided in the entire circumferential direction. An electric compressor (1) according to claim 1,
The electric compressor (1), wherein the refrigerant passage (13) is provided at equal intervals in the circumferential direction. The electric compressor (1) according to any one of claims 1 to 3,
An electric compressor (1), wherein a long hole (15) is provided in a circumferential direction of a bottom surface portion (5a) of the middle housing (5).

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