JP2000283070A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a carbon dioxide refrigerant as a refrigerant and to stably feed lubrication oil to a slide surface between a lap and an end plate. SOLUTION: This scroll compressor comprises a suction pipe 26 to feed a refrigerant fed from the outside of the compressor; a discharge pipe 33 to discharge a compressed refrigerant to the outside of the compressor; a lubrication oil injection pipe 30 situated in a manner to be immersed in lubrication oil 23 stored in a closed case 18 and communicated with the intake pipe 26; a flow rate regulator 31 situated in the middle of the lubrication oil injection pipe 30; and a temperature detector 32 to detect the temperature of a refrigerant flowing through the discharge pipe 33. This constitution injects the lubrication oil 23 in the intake pipe 26 through the lubrication oil injection pipe 30 and stably supplies the injected lubrication oil 23 to a slide surfage between laps 15 and 16 and end plates 13 and 14 by feeding the injected lubrication oil 23 to a compression chamber 17 togetherwith a sucked refrigerant. In this case, an amount of the injected lubrication oil 23 is regulated by a flow rate regulator 31 based on a signal from the temperature detector 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor capable of stably supplying lubricating oil to at least a sliding surface between a head plate and a lap.

[0002]

2. Description of the Related Art Conventionally, scroll compressors have been used in various technical fields. FIG. 2 shows a sectional view of such a scroll compressor.

The scroll compressor has a fixed scroll 111 in which spiral wraps 115 and 116 are erected on end plates 113 and 114 and an orbiting scroll 112, and a tip provided at the tip of each of the wraps 115 and 116. A compression chamber 117 is formed by a seal (not shown) abutting on the other end plates 113 and 114.

The orbiting scroll 112 has a sealed case 118.
Slidably provided on a frame 119 fixed to the
A motor 120 is provided below the frame 119.

The driving force of the motor 120 is
The orbiting scroll 112 is revolved with respect to the fixed scroll 111 by the movement direction being regulated by the Oldham ring 122 and the like.

The lubricating oil 123 is stored at the bottom of the sealed case 118, and a lubricating oil passage 124 is formed in the motor shaft 121.

[0007] When the motor 120 rotates, the refrigerant is sucked into the compression chamber 117 through the suction pipe 126, and the refrigerant is compressed as the compression chamber 117 contracts, and is compressed from the discharge port 125 into the closed case 118. Discharged. The refrigerant discharged into the sealed case 118 is discharged out of the device via the discharge pipe 133.

When the compressed refrigerant is discharged into the sealed case 118, the lubricating oil 123
The lubricating oil 123 is supplied to the sliding surface of the frame 119 and the orbiting scroll 112 through the lubricating oil passage 124 by being pushed by the pressure in the lubricating oil 18. The liquid is supplied to the sliding surfaces of the wraps 115 and 116 and the end plates 113 and 114 by an injector.

[0009] As a refrigerant, a refrigerant containing chlorine such as R-22 (hereinafter referred to as a specific Freon gas) is used.

[0010]

However, in the scroll compressor having the above structure, a lubricating oil injector is provided to supply the lubricating oil 123 to the sliding surfaces between the wraps 115 and 116 and the end plates 113 and 114. However, such a lubricating oil injector has a complicated configuration, and when the amount of the lubricating oil 123 supplied through the lubricating oil passage 124 fluctuates, the wraps 115 and 116 and the end plates 113 and 11 are stably provided.
4 is difficult to supply to the sliding surface.

In addition, there is a demand for a refrigerant which does not cause such environmental destruction as the specified CFC gas causes destruction of the ozone layer and becomes a regulated object.

Accordingly, the present invention provides a scroll compressor which uses a safe refrigerant which does not destroy the ozone layer, and which can stably supply lubricating oil to a sliding surface in a compressor to improve the reliability of the apparatus. The purpose is to provide a machine.

[0013]

In order to solve the above-mentioned problems, the invention according to claim 1 includes a driving element, a fixed scroll having a spiral wrap provided on a head plate, and a swinging scroll, and The tip seals provided at the tips of these wraps are combined so as to abut on the other end plate and slide to form a compression chamber, and the orbiting scroll revolves with respect to the fixed scroll by the drive element to form a compression chamber. In a scroll compressor in which a compression element for compressing a refrigerant by being reduced is housed in a closed case, and lubricating oil for lubricating at least a sliding surface between the wrap and the end plate is stored in the closed case, And one opening is provided so as to be immersed in the lubricating oil stored in the sealed case, and the other opening is provided so as to communicate with the suction pipe. It has a lubricating oil injection pipe that injects the lubricating oil stored in the sealed case into the suction pipe, uses a safe refrigerant that does not destroy the ozone layer, and can stably supply the lubricating oil to the sliding surface in the compressor. In this manner, the reliability of the apparatus can be improved.

According to a second aspect of the present invention, there is provided a flow controller provided in the middle of the lubricating oil injection pipe to adjust the flow rate of the lubricating oil injected into the suction pipe through the lubricating oil injection pipe. ,
The present invention is characterized in that an appropriate amount of lubricating oil can be stably supplied to the sliding surface in the compressor even if the operation state of the scroll compressor changes.

According to a third aspect of the present invention, there is provided a discharge pipe for discharging the refrigerant compressed by the compression element to the outside of the machine, and a temperature detector for detecting a temperature of the refrigerant flowing through the discharge pipe. The adjuster adjusts the flow rate of the lubricating oil flowing through the lubricating oil injection pipe based on the signal from the temperature detector, so that even if the operating state of the scroll compressor fluctuates, it can be stably applied to the sliding surface in the compressor. Characterized in that the lubricant oil can be supplied stably.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a scroll compressor according to the present invention.

The scroll compressor has a fixed scroll 11,
A motor 20 and the like for revolving the orbiting scroll 12 with respect to the orbiting scroll 12 and the fixed scroll 11 are housed in a closed case 18, and a carbon dioxide refrigerant is used as a refrigerant.

Since carbon dioxide refrigerant does not contain chlorine like specific freon, there is an advantage that it does not cause ozone layer destruction and does not cause environmental destruction.

Fixed scroll 11 and swinging scroll 1
Reference numeral 2 denotes mirror-finished mirror plates 13 and 14 and this mirror plate 1
Spiral wraps 15 and 16 erected on the scrolls 3 and 14, respectively, and the wraps 15 and 16 are disposed so as to abut and slide on the end plates 13 and 14 of the scrolls 11 and 12 facing each other. The space formed by these forms a compression chamber 17.

Power is transmitted from the motor 20 to the orbiting scroll 12 and the direction of movement is defined by the Oldham ring 22 and the like, and the orbiting scroll 12 is configured to revolve with respect to the fixed scroll 11. The compression chamber 17 is contracted and the refrigerant is compressed.

In the scroll compressor, the compression chamber 17
Are present, and their positions and volumes change with the revolution of the orbiting scroll 12.

In such a configuration, the refrigerant is sucked into the compression chamber 17 through the suction pipe 26 fixed to the end plate 13 of the fixed scroll 11, and is compressed as the compression chamber 17 is reduced and discharged from the discharge port 25. Is done.

The discharge port 25 is provided with a main valve 27 so as to close the opening, so that the refrigerant is discharged into the closed case 18 when the pressure in the compression chamber 17 reaches a predetermined pressure. I have.

By the way, as described above, the orbiting scroll 12 and the frame 19, the wraps 15, 16 and the end plates 13, 1
4 slide in contact with each other, it is necessary to suppress wear of these sliding surfaces.

Therefore, the lubricating oil 23 stored in the lower portion (the lower side in FIG. 1) of the sealed case 18 is supplied to each sliding surface using a differential pressure pump or the like.

The lubricating oil 23 can be stably supplied to the sliding surface between the orbiting scroll 12 and the frame 19 by a differential pressure pump or the like, but the sliding between the wraps 15 and 16 and the end plates 13 and 14 can be performed. The supply amount of the lubricating oil 23 to the surface depends on the revolving state of the orbiting scroll 12, so that it may be difficult to supply the lubricating oil 23 stably.

That is, conventionally, a lubricating oil injector is provided, and a part of the lubricating oil 23 supplied to the sliding surface between the orbiting scroll 12 and the frame 19 by the differential pressure pump is wrapped 15, 16
And the end surfaces of the end plates 13 and 14.

At this time, if the lubricating oil injector is provided on the center side of the orbiting scroll 12, it becomes necessary to provide a hole through which the lubricating oil 23 passes, and the orbiting scroll 12 is bent. Lap 1
In some cases, the tip of the end plate 6 may not be in close contact with the facing end plate 13.

For this reason, a lubricating oil injector is usually provided at the peripheral end of the orbiting scroll 12. Therefore, the lubricating oil 23 supplied to the sliding surfaces between the wraps 15 and 16 and the end plates 13 and 14 by this lubricating oil injector is not mixed with the lubricating oil 23 passing through the sliding surface between the orbiting scroll 12 and the frame 19. Become.

Since the amount of the lubricating oil 23 supplied to the sliding surface between the orbiting scroll 12 and the frame 19 depends on the operating state of the scroll compressor, that is, the pressure in the closed case 18, the scroll compressor operates at a low speed. In the case of operation, the amount of lubricating oil 23 supplied to the sliding surface between the orbiting scroll 12 and the frame 19 by the differential pressure pump is reduced, and the sliding surface between the wraps 15, 16 and the end plates 13, 14 is reduced. It is difficult to supply the lubricating oil 23 stably.

Therefore, in the present invention, the bottom of the sealed case 18 and the suction pipe 26 are connected by a lubricating oil injection pipe 30, and the lubricating oil injection pipe 30 is provided with a flow rate regulator 31 composed of an electric valve, an expansion valve and the like. ing.

The flow controller 31 adjusts the degree of opening and closing of the valve based on a signal from a temperature detector 32 for detecting the temperature of the refrigerant discharged from the discharge pipe 33 to the outside of the apparatus.

When the scroll compressor rotates at a high speed, the lubricating oil 23 on the sliding surfaces between the wraps 15, 16 and the end plates 13, 14 tends to be insufficient, and the temperature of the refrigerant flowing through the discharge pipe 33 increases. The flow controller 31 increases the amount of the lubricating oil 23 supplied to the suction pipe 26 via the lubricating oil injection pipe 30 based on a signal from the temperature detector 32 which detects the temperature of the refrigerant.

The lubricating oil 23 injected into the suction pipe 26 enters the compression chamber 17 together with the refrigerant, and when the pressure in the compression chamber 17 increases, a small amount of refrigerant leaks through this sliding surface.

As a result, the sliding surfaces of the wraps 15, 16 and the end plates 13, 14 are lubricated by the lubricating oil 23 contained in the leaking refrigerant and the lubricating oil 23 leaking together with the refrigerant.
In addition, the sliding surface is sealed.

Accordingly, the stable supply of the lubricating oil 23 becomes possible without using a lubricating oil injector having a complicated structure as in the prior art, thereby reducing the cost and improving the reliability of the apparatus and suppressing the leakage of the refrigerant. It is possible to suppress a decrease in compression efficiency.

In the above description, the case where the lubricating oil injector is not used has been described. However, it is needless to say that the present invention is not limited to this, and the lubricating oil injector may be used.

[0038]

As described above, according to the first aspect of the present invention, since the lubricating oil injection pipe is provided so that the lubricating oil stored in the closed case is injected into the suction pipe, the ozone layer is destroyed. Even if a safe refrigerant is used, lubricating oil can be stably supplied to the sliding surface in the compressor, and the reliability of the device is improved.

According to the second aspect of the present invention, the flow rate regulator for adjusting the flow rate of the lubricating oil is provided in the middle of the lubricating oil injection pipe. An appropriate amount of lubricating oil can be stably supplied to the moving surface.

According to the third aspect of the present invention, a temperature detector for detecting the temperature of the refrigerant flowing through the discharge pipe is provided, and the flow rate regulator moves through the lubricating oil injection pipe based on a signal from the temperature detector. Since the flow rate of the lubricating oil to be adjusted is adjusted, an appropriate amount of lubricating oil can be stably supplied to the sliding surface in the compressor even if the operating state of the scroll compressor fluctuates.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a scroll compressor applied to a description of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a scroll compressor applied to the description of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Fixed scroll 12 Oscillating scroll 13, 14 End plate 15, 16 Lap 17 Compression chamber 18 Hermetic case 19 Frame 20 Motor 23 Lubricating oil 26 Suction pipe 30 Lubricating oil injection pipe 31 Flow controller 32 Temperature detector 33 Discharge pipe

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Eiichi Shimizu 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kazuya Sato 2-5-5 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Makoto Ma 5-5-2-5 Keihan Hondori, Moriguchi City, Osaka Prefecture (72) Inventor Takehiro Nishikawa 2 Keihan Hondori, Moriguchi City, Osaka Prefecture 5-5-5 Sanyo Electric Co., Ltd. F-term (reference) 3H029 AA02 AA14 AA21 AB03 BB06 BB51 CC12 CC24 CC33 CC57 CC61 3H039 AA03 AA06 AA12 BB11 BB21 CC05 CC08 CC27 CC28 CC34 CC40 CC42

Claims (3)

[Claims] 1. A drive element, comprising a fixed scroll and an orbiting scroll in which a spiral wrap is erected on a mirror plate, and a tip seal provided on these wrap surfaces slides on a mating mirror plate. To form a compression chamber,
The orbiting scroll revolves with respect to the fixed scroll by the driving element, and the compression element that compresses the refrigerant by reducing the compression chamber is housed in a closed case, and at least sliding of the tip seal and the end plate is performed. In a scroll compressor in which lubricating oil for lubricating a surface is stored in the sealed case, a suction pipe for supplying a refrigerant from outside the compressor to the compression element, and one opening is immersed in the lubricating oil stored in the sealed case. And the other opening is provided so as to communicate with the suction pipe, and a lubricating oil injection pipe for injecting the lubricating oil stored in the sealed case into the suction pipe is provided. Scroll compressor. 2. It is provided in the middle of the lubricating oil injection pipe,
2. The scroll compressor according to claim 1, further comprising a flow regulator for adjusting a flow rate of the lubricating oil injected into the suction pipe through the lubricating oil injection pipe. 3. A discharge pipe for discharging the refrigerant compressed by the compression element to the outside of the machine, and a temperature detector for detecting a temperature of the refrigerant flowing through the discharge pipe, wherein the flow rate regulator is The scroll compressor according to claim 2, wherein a flow rate of the lubricating oil flowing through the lubricating oil injection pipe is adjusted based on a signal from a temperature detector.