WO2008032514A1

WO2008032514A1 - Compressor

Info

Publication number: WO2008032514A1
Application number: PCT/JP2007/065535
Authority: WO
Inventors: Noriyuki Kobayashi; Akiyoshi Higashiyama
Original assignee: Sanden Corporation
Priority date: 2006-09-11
Filing date: 2007-08-08
Publication date: 2008-03-20
Also published as: EP2063122A1; EP2063122B1; EP2063122A4; JP4989944B2; JP2008064076A

Abstract

A compressor in which cooling performance of a motor is enhanced and power of separation of refrigerant from lubricant can be also enhanced. Since refrigerant flowing from a compressing section (20) into a space (17) on the motor (30) side is passed such that the flow velocity of the refrigerant flowing through a space (36) on the downstream side becomes higher toward one end in the central axis direction of the tubular stator (32) of the motor (30) than that of the refrigerant flowing through a space (35) on the upstream side, the coil (32c) of the stator (32) can be cooled by the refrigerant flowing such that the flow velocity on the downstream side becomes higher toward one end in the central axis direction of the stator (32) than that on the upstream side, and thereby cooling performance of the motor (30) can be enhanced. Furthermore, lubricant contained in the refrigerant can be made to adhere to the stator (32) by making the refrigerant collide against one end in the central axis direction of the stator (32), and lubricant contained in the refrigerant can be separated efficiently.

Description

Specification

Compressor

Technical field

TECHNICAL FIELD [0001] The present invention relates to a compressor provided with a compression unit for compressing a refrigerant and an electric motor for driving the compression unit in an airtight container.

Background art

Conventionally, this type of compressor includes a compression unit for compressing refrigerant, an electric motor for driving the compression unit, and a housing in which the compression unit and the electric motor are housed. It is known that the electric motor is cooled by the refrigerant compressed in the contraction portion, and the refrigerant having cooled the electric motor is discharged out of the housing (for example, see Patent Document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2005-2799

Disclosure of the invention

Problems to be solved by the invention

[0003] In a conventional compressor, the electric motor is cooled by causing the refrigerant compressed in the compression section to flow into a space provided with the electric motor. However, since the refrigerant flowing into the space where the motor is installed has a low flow rate, the cooling effect of the motor by the refrigerant is low, and it is difficult to obtain the necessary cooling capacity when increasing the output of the motor.

[0004] An object of the present invention is to provide a compressor capable of improving the cooling performance of an electric motor and efficiently separating the lubricating oil contained in the refrigerant.

Means for solving the problem

In order to achieve the above object, the present invention provides a compression unit for compressing a refrigerant, an electric motor for driving the compression unit, a housing in which the compression unit and the electric motor are housed, and a compression unit. In order to cool the electric motor with the refrigerant compressed in step 1, the refrigerant flowing into the motor-side space from the compression section is increased in flow rate toward the upstream side toward the central axial end of the stator formed in the cylindrical shape of the electric motor. On the other hand, it is equipped with a refrigerant distribution mechanism for allowing the downstream flow rate to increase.

[0006] Thereby, the refrigerant flowing from the compression section into the space on the electric motor side is moved in the direction of the central axis of the stator. Since it flows toward the one end so that the downstream side is faster than the upstream side, the coil of the stator is cooled by the refrigerant, and the lubricating oil contained in the refrigerant adheres to the stator. Lubricating oil is separated.

The invention's effect

[0007] According to the present invention, the stator coil can be cooled by the refrigerant flowing so that the flow velocity on the downstream side is higher than the upstream side toward one end in the central axis direction of the stator. It is possible to improve the cooling performance. In addition, since the refrigerant can collide with one end in the central axis direction of the stator and the lubricating oil contained in the refrigerant can adhere to the stator, the lubricating oil contained in the refrigerant can be efficiently separated. .

[0008] The above and other objects, features, and benefits of the present invention will become apparent from the following description and the accompanying drawings.

Brief Description of Drawings

FIG. 1 is a side sectional view of a compressor showing an embodiment of the present invention.

FIG. 2 is a plan sectional view of the compressor.

FIG. 3 is an overall perspective view of a third partition member.

FIG. 4 is a plan view of a third partition member.

Explanation of symbols

[0010] 10 ··· Nosing, 20 ··· Compression, 30 ··· Electric motor, 32 ··· Stator, 32c '-Coinole, 33 ······ Second partition member, 34 ··· 3 partition members, 34c: connecting portion, 34e: communication hole.

BEST MODE FOR CARRYING OUT THE INVENTION

[0011] This compressor is provided in a vertically long housing 10, an upper part in the housing 10, a compression part 20 for compressing the sucked refrigerant, and a lower part of the compression part 20 in the housing 10. The hermetic compressor includes an electric motor 30 for driving the compression unit 20. In addition, this compressor uses carbon dioxide, which becomes supercritical by compression, as a refrigerant.

[0012] The housing 10 closes a housing main body 11 made of a cylindrical member having a central axis directed in the vertical direction, and an upper end opening and a lower end opening of the housing main body 11, respectively. It consists of a cap 12 formed in a hemispherical shape. A refrigerant discharge pipe 13 for discharging the refrigerant compressed in the compression unit 20 is connected to the cap 12 that closes the upper end opening of the housing body 11. A refrigerant suction pipe 14 for sucking refrigerant is connected to the peripheral surface of the housing body 11 where the compression unit 20 is located.

[0013] The compression unit 20 is provided on the upper side of the housing body 11 so as to partition the interior of the housing 10 up and down, and is provided below the fixed scroll member 21, and is attached to the fixed scroll member 21. On the other hand, it becomes a force with the orbiting scroll member 22 that can be rotated without rotating.

[0014] The fixed scroll member 21 is made of a disk-like member arranged with its central axis facing up and down, and a spiral body is provided on the lower surface side. A refrigerant discharge hole 21a for discharging a compressed refrigerant is provided in the central portion of the fixed scroll member 21 in the radial direction.

[0015] The orbiting scroll member 22 is formed of a disk-like member provided so as to face the fixed scroll member 21, and a spiral body is provided on the upper surface side. The upper end of the drive shaft 23 is connected to the lower surface side of the orbiting scroll member 22.

The drive shaft 23 is arranged with the central axis serving as the center of rotation directed upward and downward, and the connecting portion 23a with the turning scroll member 22 is provided to be eccentric from the rotation center of the drive shaft 23. The drive shaft 23 is rotatably supported by an upper frame 24 whose upper end side is provided so as to partition the upper part in the housing 10 up and down, and a lower frame in which the lower side is provided so as to partition the lower part in the housing 10 up and down. 25 is rotatably supported. The drive shaft 23 is rotated with the rotational force of the electric motor 30 as power, and the orbiting scroll member 22 moves on a predetermined circular orbit without rotating by the rotation of the drive shaft 23. . The drive shaft 23 is provided with a lubricating oil flow passage 23b along the central axis so that the lubricating oil sucked by the oil pump 26 connected to the lower end side is circulated through the lubricating oil flow passage 23b. Yes.

The upper frame 24 is provided so that the outer peripheral side on the upper surface side extends upward in the circumferential direction, and is connected to the outer peripheral side of the lower surface of the fixed scroll member 21. The orbiting scroll member 22 is housed in the space between the upper frame 24 and the fixed scroll member 21. [0018] The space above the fixed scroll member 21 in the housing 10 is composed of a space 15a on the refrigerant discharge hole 21a side of the fixed scroll member 21 and a space 15b on the refrigerant discharge pipe 13 side by the first partition member 15. It is divided into. The space 15a on the refrigerant discharge hole 21a side is communicated with the space 17 between the upper frame 24 and the lower frame 25 in the housing 10 by the first communication path 16 provided in the fixed scroll member 21 and the upper frame 24. ing. In addition, the space 17 between the upper frame 24 and the lower frame 25 in the housing 10 is made into a space 15b on the refrigerant discharge pipe 13 side by the fixed scroll member 21 and the second communication path 18 provided in the upper frame 24. It is communicated. Furthermore, in the space 19 below the lower frame 25 in the housing 10, lubricating oil for lubricating each sliding portion in the housing 10 is stored, and the stored lubricating oil is stored in the oil pump. 26 circulates through the lubricating oil flow passage 23b of the drive shaft 23.

[0019] The electric motor 30 is provided in a space 17 between the upper frame 24 and the lower frame 25, and is provided with a rotor 31 made of a permanent magnet fixed to the drive shaft 23, and surrounding the rotor 31, and a housing. The stator 32 is fixed to the main body 11.

[0020] The stator 32 includes a stator core 32a provided by laminating a plurality of electromagnetic steel plates formed in an annular shape in the central axis direction of the housing body 11, and a plurality of teeth 32b provided on the inner peripheral side of the stator core 32a. And a cylindrical portion 32d extending upward from the outer peripheral side of the upper surface of the stator core 32a in the circumferential direction. In addition, on the outer peripheral surface side of the stator 32, the stator 32 is provided so as to extend in the up-down direction at intervals in the circumferential direction, and a plurality of third spaces for communicating the space 17 above and below the stator 32 are provided. Communication passage 3 2e is provided.

[0021] Further, between the upper frame 24 and the electric motor 30, a second partition member 33 that is fixed to the upper frame 24 side and partitions the radially inner side and the outer side in the circumferential direction, and the upper end side is the second frame. A third partition member 34 is provided which is coupled to the partition member 33 and has a lower end side fitted to the inner surface of the cylindrical portion 32d and forms an annular space along the upper surface of the stator 32 of the electric motor 30. It has been.

The second partition member 33 is formed of a cylindrical member, and the upper end side is fixed to the lower surface of the upper frame 24 by screwing or the like with the central axis facing up and down. [0023] The third partition member 34 extends vertically on the outer peripheral side of the upper surface of the stator 32 in the circumferential direction, and on the inner peripheral side of the upper surface of the stator 32 in the circumferential direction. The second cylindrical portion 34b includes a first cylindrical portion 34a and a connecting portion 34c as a flow path closing plate that continuously connects the first cylindrical portion 34a and the second cylindrical portion 34b in the circumferential direction. The third partition member 34 is formed by inserting the lower end of the second cutting member 33 between a pair of cylindrical projecting pieces 34d extending upward in the circumferential direction from the outer peripheral side of the connecting portion 34c. It is connected to the second partition member 33 and connected to the stator 32 by inserting the first cylindrical portion 34 a into the cylindrical portion 32 d of the stator 32. The second cylindrical portion 34b is provided so as to extend from the inner peripheral surface of the upper surface of the stator 32 to the lower surface of the upper frame 24, and partitions the upper space of the electric motor 30 into the rotor 31 side and the stator 32 side. The first communication path 16 communicates with the space 35 located between the second cylindrical portion 34b and the second partition member 33. The connecting portion 34c has a round shape that communicates the space 35 between the second cylindrical portion 34b and the second partition member 33 and the space 36 between the first cylindrical portion 34a and the second cylindrical portion 34b. A plurality of communication holes 34e serving as refrigerant injection holes opened in a shape are provided at intervals in the circumferential direction. Each communication hole 34e increases the flow rate of the refrigerant toward the upper part of the coil 32c of the stator 32 by narrowing the cross-sectional area of the refrigerant flowing out of the compression unit 20 and flowing into the space 17 on the electric motor 30 side. It is designed to be discharged.

In the compressor configured as described above, when the drive shaft 23 is rotated by energizing the electric motor 30, the orbiting scroll member 22 rotates relative to the fixed scroll member 21 in the compression unit 20.

Thereby, the refrigerant flowing into the housing 10 from the refrigerant suction pipe 14 flows into the compression unit 20 and is compressed between the spiral bodies of the fixed scroll member 21 and the orbiting scroll member 22 to discharge the refrigerant. It is discharged from the hole 21a into the space 15a. The refrigerant discharged into the space 15a flows through the first communication path 16 and flows into the space 35, and then passes through the communication holes 34e and flows into the space 36. The refrigerant flowing into the space 36 flows between the coil 32c and the coil 32c of the stator 32 and flows into the lower portion of the space 17 from the lower end side of the stator 32. The refrigerant flowing into the lower part of the space 17 flows into the upper part of the space 17 via the third communication path 32e, and then flows into the space 15b via the second communication path 18 and from the refrigerant discharge pipe 13. Flows out of housing 10 [0026] At this time, the refrigerant discharged from the compression unit 20 and flowing into the space 35 comes into contact with the inner wall of the space 35. Therefore, the lubricating oil contained in the refrigerant adheres to the inner wall of the space 35 and lubricates the refrigerant. Oil is separated.

[0027] In addition, the refrigerant flowing from the space 35 into the space 36 contacts the coil 32c of the stator 32 in a state where the flow velocity is increased by passing through each of the communication holes 34e. Is effectively cooled, and the lubricating oil contained in the refrigerant adheres to the coil 32c to separate the refrigerant and the lubricating oil.

As described above, according to the compressor of the present embodiment, the refrigerant flowing into the space 17 on the electric motor 30 side from the compression unit 20 is supplied to the one end portion in the central axis direction of the stator 32 formed in the cylindrical shape of the electric motor 30. Since the refrigerant is circulated so that the flow velocity of the refrigerant flowing through the downstream space 36 is higher than the upstream space 35 toward the upstream side 35 toward the upstream side and toward the one end in the central axis direction of the stator 32. Thus, the coil 32c of the stator 32 can be cooled by the refrigerant flowing so as to increase the flow velocity on the downstream side, and the cooling performance of the electric motor 30 can be improved. Further, since the refrigerant at one end in the central axis direction of the stator 32 can collide and the lubricating oil contained in the refrigerant can be attached to the stator 32, the lubricating oil contained in the refrigerant can be efficiently separated. Become.

[0029] Further, the flow velocity on the downstream side with respect to the upstream side from the connecting portion 34c of the third partition member 34 and the communication hole 34e provided in the connecting portion 34c toward one end portion in the central axis direction of the stator 32 is increased. Since the refrigerant is circulated so as to be faster, the flow velocity increases toward one end in the central axis direction of the stator 32 by reducing the refrigerant cross-sectional area without requiring a complicated mechanism. Refrigerant can be circulated and manufacturing costs can be reduced.

[0030] Further, since the third partition member 34 is provided at a distance from one end in the central axis direction of the stator 32, and a plurality of communication holes 34e are provided at intervals in the circumferential direction of the stator 32, The refrigerant can be uniformly injected to the one end surface in the central axis direction of the stator 32 in the circumferential direction, and the cooling capability of the electric motor 30 and the separation capability of the refrigerant and the lubricating oil can be improved. [0031] In the above-described embodiment, the connection portion 34c of the third partition member 34 is provided with a plurality of slits indicating that a plurality of circular communication holes 34e are provided, and the flow rate of the refrigerant is increased by each slit. It can also be faster.

[0032] The preferences described herein! /, The embodiments are exemplary and not limiting! /. The scope of the invention is indicated by the appended claims, and all variations that fall within the meaning of these claims are intended to be included in the present invention.

Claims

The scope of the claims

[1] a compression section for compressing the refrigerant;

An electric motor for driving the compression unit;

A housing in which the compression unit and the electric motor are housed, and

The refrigerant flowing into the motor-side space from the compression section is directed toward one end in the central axis direction of the stator formed in a cylindrical shape of the motor so that the downstream flow speed becomes faster than the upstream flow speed. With a refrigerant distribution mechanism for distribution

Compressor.

[2] The refrigerant circulation mechanism includes a flow path closing member for closing a refrigerant flow path between the compression unit and the electric motor, and a refrigerant ejection hole provided in the flow path closing member.

The compressor according to claim 1.

[3] The flow path closing member is provided at a distance from one end in the central axis direction of the stator,

3. The compressor according to claim 2, wherein a plurality of refrigerant ejection holes are provided at intervals in the circumferential direction of the stator.

[4] The refrigerant is carbon dioxide

The compressor according to any one of claims 1 to 3.