WO1999008001A1

WO1999008001A1 - Horizontal type scroll compressor

Info

Publication number: WO1999008001A1
Application number: PCT/JP1998/003497
Authority: WO
Inventors: Masakuni Ishikawa; Hiroaki Oike; Hiromichi Tanabe; Satoru Kawai
Original assignee: Zexel Corporation
Priority date: 1997-08-07
Filing date: 1998-08-06
Publication date: 1999-02-18
Also published as: CN1251639A; JPH1162859A; KR20000048834A

Abstract

A horizontal type scroll compressor capable of improving a lubricating performance of bearing portions of a rotating shaft and suppressing temperature rise of the bearing portions, wherein an annular-shaped oil pressure space is formed on that portion of the rotating shaft, to which a discharge side of a spiral pump is opened, a sealing portion is provided between the oil pressure space and a high pressure space, and an oil discharge passage is provided for communication between the oil pressure space and an oil reservoir. Accordingly, the oil pressure space, to which an end of the spiral pump is opened, can be completely shut off from the high pressure space, and an oil in the oil pressure space can be discharged to and circulated in the oil reservoir, so that temperature rise between the rotating shaft and a main bearing and between the rotating shaft and the sealing portion can be suppressed.

Description

Technical Specifications Horizontal Scroll Compressor Technical Field

The present invention relates to a scroll compressor used for compressing a refrigerant in an air conditioner, and more particularly to a horizontally arranged scroll compressor which is arranged horizontally. Background art

As a conventional scroll compressor, one disclosed in Japanese Patent Application Laid-Open No. S64-87984 is a scroll compressor that refuels a sliding part by a differential pressure between a high pressure and a low pressure. An oil supply passage opening to the oil reservoir at the lower part of the hermetic container in the drive shaft housing of the frame, an oil reservoir communicating with the oil supply passage, a differential pressure oil supply passage provided in the drive portion, and a lift head toward the motor-side bearing. And a viscous pump for generating pressure.

Specifically, the oil supply pipe is connected to an oil reservoir formed between the seal bearing and the motor-side bearing, and through this oil supply pipe, a differential pressure between high pressure and low pressure and a suction force of a viscous pump are used. The lubricating oil at the bottom of the frame is sucked. From this oil reservoir, the lubricating oil is supplied to the orbiting scroll side via the oil supply passage in the negative side, and the lubricating oil is supplied to the motor side bearing by the viscous pump on the other hand. As a result, the end of the motor-side bearing opens to the high-pressure side, and the lubricating oil pressure in the oil reservoir is slightly lower than the high-pressure side due to fluid loss and potential energy. It can solve the difficulty of oil supply.

However, according to the invention of the above cited reference, the motor-side bearing and the drive shaft The lubricating oil supplied in between is difficult to be discharged from the point where the motor-side bearing end is open to the high pressure side and the clearance between the motor-side bearing and the drive shaft is very narrow. The friction heat generated between the bearing and the drive shaft results in a very high temperature. In addition, if the clearance between the motor side bearing and the drive shaft is increased to cool the lubricating oil, there will be a problem that the refrigerant will enter from the high pressure side, or a seal will seal between the high pressure side. Must be specially formed.

Accordingly, an object of the present invention is to provide a horizontal scroll compressor having a structure capable of improving lubricity of a bearing portion of a drive shaft and suppressing a rise in the temperature of the bearing portion. Disclosure of the invention

Therefore, the present invention provides a substantially cylindrical sealed case having a shaft in the horizontal direction and provided with a refrigerant suction pipe and a refrigerant discharge pipe, a high-pressure space formed in the sealed case, A driving unit disposed, a rotating shaft extending in the horizontal direction from the driving unit, a main bearing rotatably holding the rotating shaft, and a block having a through-hole in which the main bearing is mounted. An eccentric shaft eccentric to the center axis of the rotating shaft and extending from an end of the rotating shaft; and an oscillating scroll member mounted on the eccentric shaft and having a spiral oscillating scroll on a side opposite to the eccentric shaft, A fixed scroll member that has a fixed scroll that is combined with the orbiting scroll to define a compression chamber, and that holds the orbiting scroll member between the block and the block so as to be able to swing; Sa An oil space defined by one end of the main bearing, the rotating shaft, and the block, and communicating with the oil reservoir via an oil suction pipe; one end opening in the oil space; A spiral pump formed spirally on the surface of the rotating shaft against which the receiver contacts A horizontal oil pressure space compressor provided in a horizontal type compressor provided with a ring-shaped oil pressure space formed at a portion where a discharge side end of the spiral pump is engaged, and disposed between the oil pressure space and the high pressure space. The present invention comprises a seal portion to be formed, an oil discharge passage for discharging oil staying in the oil pressure space into an oil reservoir, and a throttle mechanism formed in the oil discharge passage.

Therefore, according to the present invention, an annular oil pressure space is formed at a portion of the drive shaft where the discharge side of the spiral pump opens, and a seal portion is provided between the oil pressure space and the high pressure space. By providing an oil discharge passage communicating the oil pressure space with the oil reservoir, the lubricating oil in the oil pressure space can be raised to a predetermined pressure. The open oil space and high-pressure space can be completely shut off, and the oil in the oil pressure space can be discharged and circulated to the oil reservoir, so the space between the drive shaft and the main bearing, the drive shaft and the seal It is possible to suppress the temperature rise between the parts.

In the present invention, the oil discharge passage includes an annular passage formed in the block in an annular shape, and a discharge passage communicating a lower portion of the annular passage with the oil reservoir. The oil pressure space communicates with the upper part of the oil pressure space. As a result, the lubricating oil rises around the drive shaft, and the lubricating oil passes through the block, so that the rise in the temperature of the periphery can be suppressed.

Further, the oil discharge passage is provided with a throttle mechanism having a predetermined passage resistance. Accordingly, the pressure of the lubricating oil in the oil pressure space can be maintained at a high pressure, so that the sealing performance of the seal portion can be improved. In particular, it is desirable that the throttle mechanism is provided in the discharge passage.

Furthermore, the seal portion is provided between the oil pressure space and the high pressure space. An oil groove formed in an annular shape along the outer peripheral side surface of the rotary shaft at a predetermined position, and the oil groove is communicated with the oil pressure space by a second spiral pump. As a result, lubricating oil at a predetermined pressure can be stored in the oil groove, so that the sealing performance of the seal portion can be improved and positive lubrication can be achieved.

Further, the main bearing and the seal portion may be formed integrally. Thus, the seal portion and the main bearing can be integrally formed, so that the number of parts can be reduced. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a cross-sectional view of a horizontal scroll compressor according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of a horizontal scroll compressor according to the first embodiment of the present invention. FIG. 3 is a partially enlarged cross-sectional view, FIG. 3 is an A-A cross-sectional view of the horizontal scroll compressor according to the first embodiment of the present invention, and FIG. 4 is a second embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional view of the horizontal scroll compressor according to the embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

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

A horizontal scroll compressor 1 shown in FIGS. 1 and 2 has a hermetically sealed case 2 having a central axis extending in a horizontal direction, a driving portion 3 disposed in the hermetically sealed case 2, and driven by the driving portion 3. And a compression unit 4.

The closed case 2 is constituted by a cylindrical case 6 having a refrigerant suction pipe 5 attached to a side portion thereof, and a pair of lids 7 and 8 for closing both ends of the cylindrical case 6. The lid 7 has a refrigerant discharge pipe 8 and the drive A power supply terminal 9 for supplying power to the moving unit 3 is provided.

The drive unit 3 is a brushless motor in this embodiment. The drive unit 3 is fixed to the inner peripheral surface of the cylindrical case 6 and has an exciting coil 10 wound thereon to generate a rotating magnetic field 11. And a rotary shaft 12 having permanent magnets arranged at positions facing the stage 11 and having alternately different magnetic poles, and a rotating shaft 13 to which the stage 12 is fixed. It is constituted by and. The rotating shaft 13 is provided so as to extend in the horizontal direction, and one end of the rotating shaft 13 on the side of the lid 7 is disposed in a central portion of a holding plate 14 fixed to the cylindrical case 6. It is rotatably held by the sub bearing 18. The holding plate 14 has a coolant passage 15 formed therein, and a coolant guide 16 is formed at a portion facing the coolant passage 15. As a result, the refrigerant that has passed through the refrigerant through hole 15 in the axial direction is guided to the refrigerant guide 16 and turned radially outward, and collides with the inner surface of the cylindrical case 6 to be cooled by the refrigerant and oil. Oil separation is performed.

The other end of the rotary shaft 13 has an enlarged diameter portion 19 formed by expanding the diameter, and further has an eccentric shaft 20 eccentrically protruding from the center axis of the rotary shaft 13 at its end. Is formed. The enlarged diameter portion 19 formed on the other end of the rotating shaft 13 is provided with a main bearing 2 attached to a through hole 22 of a block 21 fixed to the inner peripheral surface of the cylindrical case 6. 3 is rotatably held.

Furthermore, a balance weight 24 is provided between the mouth 12 of the rotary shaft 13 and the enlarged diameter portion 19 to balance the rotation with the orbiting scroll member 30 described below. . The other end of the rotating shaft 13 is an axial end surface of the enlarged diameter portion 19, and a peripheral side surface of the eccentric shaft 20 is supported by a seal bearing 25. 3. An oil space 26 is defined by the seal bearing 25 and the end face of the main bearing 23. In the enlarged diameter portion 19, an annular oil pressure space 28 formed substantially at the center in the axial direction of the enlarged diameter portion 19 is formed, and the oil space 26 and the oil pressure space 28 are further formed. _c also those spiral pump 2 is formed between the, over the eccentric shaft 2 0 from the enlarged diameter portion 1 9, wherein one end into the oil space 2 6 is open, the other end the eccentric shaft 2 0 An oil guiding hole 29 is formed at an axial end of the oil guiding hole. In addition, the spiral pump 27 has a spiral shaft whose one end, which is the tip in the rotation direction, opens in the oil space 26 and the spiral pump 27, which is open in the oil pressure space 28, which is the rear end in the rotation direction, It is formed in a shape.

The compression unit 4 includes the block 21, an orbiting scroll member 30 mounted on the eccentric shaft 14, and a fixed scroll that is combined with the orbiting scroll member 30 to define a compression chamber 40. 50.

The block 21 has a through hole 22 penetrating the center thereof in the axial direction (hereinafter, the axial direction) of the center axis of the rotating shaft 13, and the through hole 22 has a main bearing 23. Is mounted, and a seal portion 61 is provided with the front oil pressure space 28 interposed therebetween. In this embodiment, the main bearing 23 and the seal portion 61 are integrally formed.

A thrust bearing 71 for slidably holding the orbiting scroll member 30 is formed on the end surface of the block 21 on the side of the orbiting scroll member, and an Oldham annularly formed on this end surface. A ring storage groove 72 is formed, and a block-side Oldham ring coupling groove 73 extending radially from a predetermined position of the Oldham ring storage groove 72 is formed. The orbiting scroll member 30 has an orbiting scroll-side Oldham ring coupling groove 31 at a position perpendicular to the block-side Oldham ring coupling groove 73 on a surface that abuts and slides on the thrust bearing 71. The claw portion of the formed Oldham ring 74 housed in the Oldham ring housing groove 72 is on the block side. The rotation of the orbiting scroll member 30 is prevented by being fitted into the Oldham ring engaging groove 2 and the orbiting scroll type Oldham ring engaging groove 31.

A rocking bearing 32 on which the eccentric shaft 20 is mounted is formed at the center of the block side surface of the rocking scroll member 30 so as to protrude in the axial direction, and the eccentricity is provided on the rocking bearing 32. By mounting the shaft 21, a bearing space 33 is defined in the oscillating bearing 32. On the side surface of the oscillating scroll member 30 on the fixed scroll member 50 side, an oscillating scroll 34 projecting toward the fixed scroll member 50 side and spiraling with respect to the side surface is formed.

The fixed scroll member 50 is fixed to the block 21 such that the swing scroll member 30 is rotatably held between the block 21 and the block 21. The fixed scroll 51 protrudes to the side and has a spiral shape with respect to the side surface. The fixed scroll 51 is combined with the orbiting scroll 34 to define the compression chamber 40. Things.

In addition, the compression chamber 40 moves with a gradually decreasing volume from the outer peripheral direction to the center direction in accordance with the oscillating motion of the oscillating scroll member 30 (orbital motion in which rotation is prevented). The suction space 41 where the outermost end of the chamber 40 is open communicates with the refrigerant suction pipe 5, and the innermost end of the compression chamber 40 is a discharge which penetrates through the central part of the fixed scroll member 50 in the axial direction. It communicates with the hole 52.

Further, a check valve 53 is disposed in the discharge hole 52, and a check valve holding plate 5 for holding the check valve 53 is provided on a side surface of the fixed scroll member 50 on the lid portion 8 side. 4 is installed. The check valve holding plate 54 also has a relief valve 57 that opens and closes a leak hole 56 communicating with the discharge space 55. Is held and fixed. .

In addition, the discharge space 55 is communicated with a high-pressure space 74 in which the drive unit 3 is disposed by a refrigerant passage 58 formed through the fixed scroll member 50 and the block 21. Further, an oil reservoir 75 is formed at a lower portion of the closed case 2, and the oil reservoir 75 and the oil space 26 are communicated by an oil suction pipe 76.

A block 80 for forming an oil discharge passage is fixed to an end of the block 21 on the drive section side by a screw 81 or the like. The oil discharge passage forming block 80 is fixed to the block 21 to form an oil discharge passage 82, and the oil discharge passage 82 is, as shown in FIG. An upper communication passage 83 communicating with the oil pressure space 28, an annular passage 84 formed in an annular shape on a contact surface with the block 21, an annular passage 84, and the oil reservoir 75. The exhaust passage 85 is provided with an orifice 86 as a throttle mechanism.

With the above configuration, when the rotation shaft 13 rotates, the swing scroll member 30 performs a swing motion (a turning motion that does not rotate) with respect to the fixed scroll member 50. With this swinging motion, the volume of the compression chamber 40 gradually decreases from the outer peripheral portion toward the center, and at the same time, the volume increases in the outer peripheral portion that opens to the suction space. The refrigerant is sucked from and compressed toward the center. Then, the compressed refrigerant is discharged from the discharge space 52 in the central portion of the fixed scroll member 50 to the discharge space 55, and reaches the high-pressure space 74 via the refrigerant passage 41. Further, the compressed refrigerant is sent from the refrigerant discharge pipe 8 to the next step through the refrigerant through hole 15.

The lubricating oil contained in the oil reservoir 75 is supplied to the high-pressure space 74 The oil is sucked into the oil space 26 through the oil suction pipe 76 by the differential pressure between the oil space 26 and the suction space 41 and the pump operation of the spiral pump 27. On the other hand, the lubricating oil sucked into the oil space 26 reaches the bearing space 33 via the oil guide hole 29, and contacts the sliding between the swing bearing 32 and the eccentric shaft 20. After lubricating the surface, the sliding surface of the thrust bearing 71 and the orbiting scroll member 30 described above is lubricated, and the periphery of the Oldham ring 74 is lubricated to reach the suction space 41. is there.

Then, it is sucked into the compression chamber 40 together with the refrigerant, seals and lubricates the contact portions of the orbiting scroll 34 and the fixed scroll 51, and is discharged from the discharge holes 52 together with the refrigerant. The refrigerant and the lubricating oil are separated by colliding with the inner surface of the lid 8 and the inner surface 12 of the lid 8 or by colliding with the inner peripheral surface of the sealed case 2 by the refrigerant guide 16. From the discharge pipe 8 to the next process, the lubricating oil returns to the oil reservoir.

On the other hand, the refrigerant sucked into the oil space 26 is sucked by the spiral pump 27, and passes between the main bearing 23 and the enlarged diameter portion 19 of the rotating shaft 13, whereby the refrigerant in this portion is removed. It not only lubricates but also absorbs and cools the frictional heat generated between the main bearing 23 and the enlarged diameter portion 19. Then, the lubricating oil is sent from the spiral pump 27 to the oil pressure space 28. The lubricating oil that has reached the oil pressure space 28 becomes slightly higher than the refrigerant pressure in the high pressure space 74 because the lubricating oil in the oil space 26 is further pressurized by the spiral pump 27. Therefore, it is possible to prevent the refrigerant in the high-pressure space 74 from intruding from the clearance between the seal portion 61 and the block 21 or the clearance between the seal portion 61 and the enlarged diameter portion 19. It is possible to lubricate and cool the space between the seal portion 61 and the block 21 and the space between the seal portion 61 and the enlarged diameter portion 19 by penetrating into the clearance. Things. Further, the lubricating oil in the oil pressure space 28 flows from the upper communication passage 83 formed in the upper part of the oil pressure space 28 to the annular passage 84, and from the lower part of the annular passage 84 to the discharge passage 85. The lubricating oil sent from the spiral pump 27 to the oil pressure space 28 always flows, so that it is possible to absorb the heat of each sliding part and cool it. It is a thing.

By forming the orifice 86 in the discharge passage 85, the pressure of the lubricating oil moving through the oil pressure space 28 can be stabilized, and the amount and flow rate of the lubricating oil flowing through the oil discharge passage 82 Therefore, the lubrication efficiency and the cooling efficiency of the main bearing 23 and the seal portion 61 can be increased.

In a second embodiment shown in FIG. 4, a seal portion 61 has a ring-shaped oil groove 90, a second spiral pump 91 which communicates the oil pressure space 28 with the oil groove 90. Is provided. Thereby, the lubricating oil in the oil pressure space 28 can be positively supplied to the seal portion 61, so that the sealing performance and the cooling performance can be further improved. In the second embodiment, the same reference numerals as those in the first embodiment or parts having the same functions as those in the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted. Availability of industrial articles

As described above, according to the present invention, an annular oil pressure space is formed at a portion of the drive shaft where the discharge side of the spiral pump opens, and a seal portion is provided between the oil pressure space and the high pressure space. In addition, by providing an oil discharge passage communicating the oil pressure space and the oil reservoir, lubrication of the main bearing and the seal portion can be improved. In addition, since the pressure in the oil pressure space is slightly higher than the pressure in the high pressure space, the sealing performance of the seal portion can be improved, and the oil space can be isolated from the high pressure space. Oil can be stably sucked into the oil space.

Claims

■ Claims

1. A substantially cylindrical hermetically sealed case having a shaft in the horizontal direction and provided with a refrigerant suction pipe and a refrigerant discharge pipe;

A high-pressure space formed in the closed case;

A drive unit disposed in the high-pressure space;

A rotating shaft extending in the horizontal direction from the driving unit;

A main bearing that rotatably holds the rotating shaft;

A block having a through hole in which the main bearing is mounted;

An eccentric shaft eccentric to the center axis of the rotation shaft and extending from an end of the rotation shaft;

An oscillating scroll member mounted on the eccentric shaft and having a spiral oscillating scroll on the side opposite to the eccentric shaft;

A fixed scroll member that has a fixed scroll that defines a compression chamber in combination with the orbiting scroll, and that holds the orbiting scroll member between the block and the block in a swingable manner;

An oil reservoir formed below the closed case,

One end of the main bearing, an oil space defined by the rotating shaft and the block, and communicating with an oil reservoir via an oil suction pipe; a rotating shaft having one end opened in the oil space and contacting the main bearing And a spiral pump formed in a spiral shape on the surface of the compressor.

An annular oil pressure space formed at a portion where the discharge side end of the spiral pump opens,

A seal portion disposed between the oil pressure space and the high pressure space; and an oil discharge for discharging oil remaining in the oil pressure space to an oil reservoir. A horizontal scroll compressor comprising a passage.

2. The oil discharge passage is composed of an annular passage formed in the block in an annular shape, and a discharge passage communicating the lower part of the annular passage with the oil reservoir. 2. The horizontal scroll compressor according to claim 1, wherein the scroll compressor communicates with an upper portion of the oil pressure space.

3. The horizontal scroll compressor according to claim 1, wherein a throttle mechanism having a predetermined passage resistance is provided in the oil discharge passage.

4. The horizontal scroll compressor according to claim 2, wherein a throttle mechanism having a predetermined passage resistance is provided in the oil discharge passage.

5. The seal portion has an oil groove formed annularly along a peripheral side surface of the rotating shaft at a predetermined position between the oil pressure space and the high pressure space, wherein the oil groove is The horizontal scroll compressor according to claim 1, wherein the horizontal scroll compressor is communicated with the space by a second spiral pump.

6. The seal portion has an oil groove formed annularly along a peripheral side surface of the rotating shaft at a predetermined position between the oil pressure space and the high pressure space, wherein the oil groove is The horizontal scroll complex according to claim 2, wherein the space is communicated with the second spiral pump. Sa.

7. The seal portion has an oil groove formed annularly along a peripheral side surface of the rotating shaft at a predetermined position between the oil pressure space and the high pressure space, and the oil groove is formed in the oil pressure space. 4. The horizontal scroll compressor according to claim 3, wherein the scroll compressor is communicated with the second spiral pump.

8. The seal portion has an oil groove formed annularly along a peripheral side surface of the rotating shaft at a predetermined position between the oil pressure space and the high pressure space, wherein the oil groove is The horizontal type scroll compressor according to claim 4, wherein the space is communicated with the space by a second spiral pump.