JP4989944B2 - Compressor - Google Patents

Description

  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.

Conventionally, this type of compressor includes a compressor that compresses refrigerant, an electric motor that drives the compressor, and a housing in which the compressor and the motor are housed, and the electric motor is driven by the refrigerant compressed in the compressor. There is known one that cools and cools the electric motor so as to discharge the refrigerant out of the housing (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 2005-2799

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

  The present invention has been made in view of the above problems, and an object thereof 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. It is in.

In order to achieve the above object, the present invention includes a compression unit that compresses a refrigerant, an electric motor that includes a stator having a coil and drives the compression unit, and a housing in which the compression unit and the electric motor are housed. In the compressor that cools the electric motor with the compressed refrigerant and discharges the refrigerant that has cooled the electric motor to the outside of the housing, a partition member that partitions the space in the housing to the inside and outside facing the inner side surface of the housing, and Inside the partition member, there is a space for guiding the refrigerant flowing from the compression portion to the electric motor side from one end portion in the axial direction of the stator to the other end portion, and in the axial direction of the stator outside the partition member. the refrigerant flowing out from the other end along the inner surface of the housing has a communicating path for guiding toward the space of the refrigerant discharge pipe side, wherein the inner the space of the partition member, the upper And a refrigerant flow means for flowing as a flow rate on the downstream side becomes faster with respect to the flow velocity of the side.

  As a result, the refrigerant flowing into the space on the electric motor side from the compressor flows toward the one end in the central axis direction of the stator so that the downstream side becomes faster with respect to the upstream side. Then, since the lubricating oil contained in the refrigerant adheres to the stator, the lubricating oil contained in the refrigerant is separated.

  According to the present invention, since the coil of the stator can be cooled by the refrigerant flowing so that the flow velocity on the downstream side becomes faster with respect to the upstream side toward one end in the central axis direction of the stator, the cooling performance of the motor can be improved. It is possible to improve. Further, since the refrigerant can collide with one end of the stator in the central axis direction and the lubricating oil contained in the refrigerant can adhere to the stator, the lubricating oil contained in the refrigerant can be efficiently separated.

  1 to 4 show an embodiment of the present invention. FIG. 1 is a sectional view of the compressor, FIG. 2 is a plan sectional view of the compressor, and FIG. 3 is an overall perspective view of a third partition member. 4 is a plan view of the third partition member.

  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 provided below the compression part 20 in the housing 10. It is a hermetic compressor provided with an electric motor 30 for driving In this compressor, carbon dioxide that becomes a supercritical state by compression is used as a refrigerant.

  The housing 10 includes a housing main body 11 made of a cylindrical member having a central axis directed in the vertical direction, and a cap 12 formed in a hemispherical shape for closing the upper end opening and the lower end opening of the housing main body 11. 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.

  The compression unit 20 is provided on the upper side of the housing body 11 so as to partition the inside of the housing 10 up and down, and is provided below the fixed scroll member 21, and rotates relative to the fixed scroll member 21. And a revolving scroll member 22 that can be revolved.

  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 21 a for discharging a compressed refrigerant is provided on the upper surface side of the central portion in the radial direction of the fixed scroll member 21.

  The orbiting scroll member 22 is a disk-shaped 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 rotation center facing up and down, and the connecting portion 23 a with the orbiting 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 provided so that the upper end side partitions the upper part in the housing 10 up and down, and the lower frame 25 provided so that the lower side partitions the lower part in the housing 10 up and down. Is rotatably supported by. The drive shaft 23 rotates 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.

  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 a space between the upper frame 24 and the fixed scroll member 21.

  The space above the fixed scroll member 21 in the housing 10 is partitioned by the first partition member 15 into a space 15 a on the refrigerant discharge hole 21 a side and a space 15 b on the refrigerant discharge pipe 13 side of the fixed scroll member 21. The space 15 a on the refrigerant discharge hole 21 a 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 passage 16 provided in the fixed scroll member 21 and the upper frame 24. Yes. Further, the space 17 between the upper frame 24 and the lower frame 25 in the housing 10 communicates with the space 15 b on the refrigerant discharge pipe 13 side by the second communication path 18 provided in the fixed scroll member 21 and the upper frame 24. Has been. 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 used as an oil pump. 26 circulates through the lubricating oil flow passage 23 b of the drive shaft 23.

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

  The stator 32 is wound around 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. A plurality of third communication passages 32e are provided on the outer peripheral surface side of the stator 32 so as to extend in the vertical direction at intervals in the circumferential direction and communicate with the space 17 above and below the stator 32. Is provided.

  Further, a second partition member 33 that is fixed between the upper frame 24 and the electric motor 30 on 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 partition member 33. And a third partition member 34 that is provided so that the lower end side is fitted to the inner surface of the cylindrical portion 32 d and forms an annular space along the upper surface of the stator 32 of the electric motor 30.

  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 with screws or the like with the central axis facing up and down.

  The third partition member 34 includes a first cylindrical portion 34a that extends vertically on the outer peripheral surface of the upper surface of the stator 32 in the circumferential direction, and a second cylinder member that extends vertically on the inner peripheral side of the upper surface of the stator 32 in the circumferential direction. It consists of a cylindrical portion 34b and a connecting portion 34c as a flow path closing plate that connects the first cylindrical portion 34a and the second cylindrical portion 34b continuously in the circumferential direction. The third partition member 34 is formed by inserting the lower end of the second partition member 33 between a pair of cylindrical protruding pieces 34d extending upward in the circumferential direction from the outer peripheral side of the connecting portion 34c. It is connected to the partition member 33 and is 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 passage 16 communicates with the space 35 located between the second cylindrical portion 34 b 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 that are opened in a shape as refrigerant injection holes 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. Are 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 with respect to the fixed scroll member 21 in the compression unit 20.

  As a result, 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, and from the refrigerant discharge hole 21a to the space 15a. Discharged. 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 that has flowed into the space 36 flows between the coil 32 c and the coil 32 c 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 portion of the space 17 flows into the upper portion of the space 17 through the third communication passage 32e, and then flows into the space 15b through the second communication passage 18 from the refrigerant discharge pipe 13. It flows out of the housing 10.

  At this time, since 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, the lubricating oil contained in the refrigerant adheres to the inner wall of the space 35 and the refrigerant and the lubricating oil are separated. The

  In addition, the refrigerant flowing into the space 36 from the space 35 contacts the coil 32c of the stator 32 in a state where the flow velocity is increased by passing through each communication hole 34e. While being cooled, the lubricating oil contained in the refrigerant adheres to the coil 32c, and the refrigerant and the lubricating oil are separated.

  Thus, according to the compressor of this embodiment, the refrigerant flowing into the space 17 on the electric motor 30 side from the compression unit 20 is directed toward 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, the downstream side of the stator 32 toward the one end in the central axis direction is more downstream than the upstream side. The coil 32c of the stator 32 can be cooled by the refrigerant flowing so as to increase the flow velocity, 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 adhere to the stator 32, the lubricating oil contained in the refrigerant can be efficiently separated. .

  Further, the flow velocity on the downstream side is increased from the upstream side toward the one end portion in the central axis direction of the stator 32 from the connecting portion 34c of the third partition member 34 and the communication hole 34e provided in the connecting portion 34c. Since the refrigerant is circulated through the refrigerant, the refrigerant is circulated so that the flow velocity becomes faster toward one end in the central axis direction of the stator 32 by reducing the refrigerant cross-sectional area without requiring a complicated mechanism. Therefore, the manufacturing cost can be reduced.

  In addition, the third partition member 34 is provided at a distance from one end of the stator 32 in the central axis direction, 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 over the circumferential direction on one end surface in the central axis direction, and the cooling capacity of the electric motor 30 and the separation capacity between the refrigerant and the lubricating oil can be improved.

  In the above-described embodiment, the connection portion 34c of the third partition member 34 is provided with a plurality of round communication holes 34e. However, a plurality of slits are provided, and each slit increases the flow rate of the refrigerant. It may be the one.

Sectional drawing of the compressor which shows one Embodiment of this invention Planer cross section of compressor Overall perspective view of third partition member Plan view of the third partition member

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Housing, 20 ... Compression part, 30 ... Electric motor, 32 ... Stator, 32c ... Coil, 33 ... 2nd partition member, 34 ... 3rd partition member, 34c ... Connection part, 34e ... Communication hole.

Claims (4)

A compressor that compresses the refrigerant; a motor that includes a stator having a coil and that drives the compressor; and a housing in which the compressor and the motor are housed; and the motor is cooled by the refrigerant compressed in the compressor, In the compressor that discharges the refrigerant that has cooled the outside of the housing,
Providing a partition member for partitioning the space in the housing inward and outward facing the inner surface of the housing;
Inside the partition member, there is a space for guiding the refrigerant flowing from the compression portion to the electric motor side from one end portion in the axial direction of the stator to the other end portion, and in the axial direction of the stator outside the partition member. Having a communication path for guiding the refrigerant flowing out from the other end portion toward the space on the refrigerant discharge pipe side along the inner surface of the housing;
The compressor characterized by having the refrigerant | coolant distribution | circulation means for distribute | circulating so that the downstream flow velocity may become quick with respect to the upstream flow velocity in the said space inside the said partition member . The said refrigerant | coolant distribution means was comprised from the flow-path closing plate which closes the refrigerant | coolant flow path between a compression part and an electric motor, and the refrigerant | coolant ejection hole provided in the flow-path closing plate. Compressor. The flow path closing plate is provided at a distance from one end in the central axis direction of the stator,
The compressor according to claim 2, wherein a plurality of refrigerant ejection holes are provided at intervals in the circumferential direction of the stator. The compressor according to any one of claims 1 to 3, wherein carbon dioxide is used as the refrigerant.

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