KR101200583B1 - Scroll compressor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a scroll compressor that prevents phase separation of refrigerant and oil stored in an oil storage part of a compressor to smoothly supply oil.

According to an aspect of the present invention, a scroll compressor includes a scroll compressor including a fixed scroll and a swing scroll which pivots relative to the fixed scroll to compress a refrigerant; A discharge chamber through which the refrigerant compressed by the scroll compression unit is discharged; An oil recovery tube communicating with the discharge chamber to allow a high temperature refrigerant and oil to flow in; And an oil recovery device communicating with the oil recovery pipe and configured to discharge the high temperature refrigerant and oil introduced through the oil recovery pipe to the oil storage part.

According to the present invention, when the compressor is operated under a low temperature heating condition such that the refrigerant and the oil of the oil storage part are phase separated, the high temperature refrigerant and the oil accumulated in the discharge chamber are recovered by the oil recovery device to the oil storage part. As it is discharged there is an effect that can prevent the phase separation of the refrigerant and the oil stored in the oil reservoir.

Oil recovery unit, phase separation

Description

Scroll compressor

1 is a cross-sectional view of a scroll compressor according to the present invention.

2 is a plan view illustrating a process of compressing the refrigerant in the scroll compression unit according to the present invention.

3 is a cross-sectional view showing the structure of an oil recovery device according to the present invention.

Figure 4 is a view showing the operating state of the oil recovery device according to the present invention.

5 is a cross-sectional view of an oil recovery device according to another embodiment of the present invention.

6 is a view showing an operating state of the oil recovery device according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

12 oil storage part 94 discharge chamber

98: oil recovery pipe 100: oil recovery device

110: case 116: outlet

120: chamber 130: valve

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a scroll compressor that prevents phase separation of refrigerant and oil stored in an oil storage part of a compressor to smoothly supply oil.

In general, a compressor is a means for converting mechanical energy into compressed energy, and is classified into reciprocating type, scroll type, centrifugal type, and vane type. In particular, scroll compressors are widely used as compressors for air conditioners and refrigerators.

In addition, the scroll compressor is divided into a low pressure scroll compressor and a high pressure scroll compressor.

In detail, the scroll compressor is divided into a low pressure scroll compressor or a high pressure scroll compressor, depending on whether suction gas is filled or discharge gas is filled in the casing.

Meanwhile, a conventional low pressure scroll compressor includes a drive motor including a rotor and a stator, a drive unit including a drive shaft which rotates together as the drive motor rotates, an eccentric portion is formed at an upper portion, and an oil passage is formed therein; It includes an upper frame fitted to the upper side of the drive shaft, and a suction pipe for allowing fluid to flow from the outside.

In addition, a swing scroll positioned above the upper frame and compressing the refrigerant sucked through the suction pipe by a swinging movement, a fixed scroll engaged with the swinging scroll and fixed to an upper side of the upper frame, and the swinging scroll is fixed. A scroll compression unit including an old dam ring for turning in the scroll and a discharge tube through which the refrigerant compressed in the fixed scroll is discharged to the outside are included.

Also included is an oil pump for pumping oil stored in the oil reservoir under the compressor into the oil feed passage.

The operation of the scroll compressor will be briefly described by the above configuration.

First, when the low pressure refrigerant, which has undergone expansion, is introduced through the suction pipe, some of the introduced refrigerant is moved to the scroll compression unit, and some is moved to the lower part of the compressor and stored in the oil reservoir. In addition, the high pressure refrigerant compressed by the scroll compressor is discharged to the outside of the compressor through the discharge pipe.

In addition, during the compression process as described above, the oil and the refrigerant stored in the oil reservoir are pumped by the oil pump is pushed upward. In addition, the oil and the like rise up to the upper end of the drive shaft along the oil passage, and soak into the frictional portion of the scroll compression portion, thereby lubricating the contact surface.

However, when the compressor is operated under low temperature heating conditions, low temperature liquid refrigerant flows into the suction pipe, and some of the low temperature liquid refrigerant introduced into the oil reservoir is stored. In this case, the low temperature refrigerant and oil The problem of phase separation without mixing occurs.

When the refrigerant and the oil are phase separated, a relatively high specific gravity refrigerant accumulates on the lower side, and a low specific gravity oil accumulates on the upper side so that the oil pump pumps only the refrigerant present in the lower side, and the oil remains on the upper side. Will remain. As a result, the oil is not supplied to the friction part, so that the problem of lubrication of the friction part occurs.

In addition, as the lubrication of the friction part is not made, wear caused by friction occurs between components, and as a result, the performance and reliability of the compressor are deteriorated.

The present invention has been proposed to solve the above problems, and bypasses the high temperature refrigerant and oil discharged into the discharge chamber to the oil reservoir of the compressor to prevent phase separation of the refrigerant and oil stored in the oil reservoir. It is an object of the present invention to propose a scroll compressor.

In addition, an object of the present invention is to propose a scroll compressor for smoothly lubricating oil during low temperature heating operation by preventing phase separation between refrigerant and oil stored in the oil reservoir.

According to another aspect of the present invention, there is provided a scroll compressor including: a scroll compressor including a fixed scroll and a swing scroll for pivoting the fixed scroll to compress the refrigerant; A discharge chamber through which the refrigerant compressed by the scroll compression unit is discharged; An oil recovery tube communicating with the discharge chamber to allow a high temperature refrigerant and oil to flow in; And an oil recovery device communicating with the oil recovery pipe and configured to discharge the high temperature refrigerant and the oil introduced through the oil recovery pipe to the oil storage part, wherein the oil recovery device includes a case and an inside of the case. And a chamber for storing the high temperature refrigerant and oil recovered by the oil recovery pipe, a discharge port for discharging the high temperature refrigerant and oil stored in the chamber, and a valve for opening and closing the discharge port.

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According to the present invention, when the compressor is operated under a low temperature heating condition and the temperature of the oil reservoir is lowered to be a condition in which the refrigerant and the oil phase separate from the oil reservoir, the oil recovery device is applied to the discharge chamber. As the accumulated high temperature coolant and oil are recovered and discharged to the oil reservoir, the phase separation of the refrigerant and the oil stored in the oil reservoir may be prevented.

In addition, as the phase separation between the refrigerant and the oil stored in the oil storage unit is prevented, the phenomenon in which only the refrigerant is pumped by the oil pump is prevented, and oil can be smoothly supplied.

In addition, as the refrigerant and the oil accumulated in the discharge chamber are recovered to the oil reservoir by the recovery device, there is an effect that stable oil supply is possible.

In addition, as the oil is smoothly supplied and lubrication is performed well on the friction part, the performance and reliability of the compressor are improved as a result.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. It is to be understood, however, that the spirit of the invention is not limited to the embodiments shown and that those skilled in the art, upon reading and understanding the spirit of the invention, may easily suggest other embodiments within the scope of the same concept.

1 is a cross-sectional view of a scroll compressor according to the present invention.

Referring to FIG. 1, the scroll compressor 1 according to the present invention includes a casing 10, a drive unit in which rotational force is generated, a suction unit in which fluid is sucked from the outside, and a scroll in which fluid sucked from the suction unit is compressed. An oil reservoir (70) below the compressor, a compressor for discharging the high pressure fluid compressed by the scroll compressor, an oil pump (70) for supplying oil to the scroll compressor, and oil for the discharge part (12). Oil recovery device 100 to be recovered to include).

In detail, the driving unit is rotated by being inserted on the center of the drive motor 20 and the drive motor 20 formed of the stator 21 and the rotor 22 located inside the stator 21, The drive shaft 30 is formed in the oil passage 32 is included.

In addition, the suction part includes a suction pipe 84 formed on one side of the outer circumferential surface of the casing 10, and a suction chamber 82 communicating with the suction pipe 84 and storing the refrigerant introduced therein.

In addition, the scroll compression unit is inserted into the upper side of the drive shaft 30 to support the drive shaft 30 and the upper frame (40) to compress the refrigerant sucked through the suction pipe (84) 40, a pivoting scroll 50 supported on the upper side, a fixed scroll 60 that is engaged with the pivoting scroll 50 and fixed to the upper side of the upper frame 40, and the pivoting scroll 50 is the fixed scroll ( 60) includes an old damling (not shown) that allows it to be pivoted within.

In addition, the discharge portion is formed in the center portion of the fixed scroll 60, the discharge port 92 for discharging the compressed refrigerant and the discharge port 92 in communication with the discharge port formed in the uppermost of the casing 10 A chamber 94 and a discharge tube 96 formed on one side of the discharge chamber 94 are included.

In addition, the oil pump 70 is the lower frame 72 for supporting the lower side of the drive shaft 30 and the pumping member 74 is inserted into the lower side of the lower frame 72 to rotate together with the drive shaft 30 And a pump cover 76 fastened to the lower side of the lower frame 72 and allowing oil to be sucked.

In addition, the oil recovery device 100 is in communication with the discharge chamber 94 by the oil recovery pipe 98, the high temperature refrigerant and oil flowing through the oil recovery pipe 94 is the oil under a predetermined condition It is to be discharged to the oil reservoir (12).

In addition, the oil recovery device 100 is immersed in the refrigerant and oil stored in the oil reservoir 12, and is preferably located at one side of the oil pump 70.

Hereinafter, the operation of the scroll compressor according to the present invention will be described.

First, when the drive motor 20 composed of the stator 21 and the rotor 22 is operated, the drive shaft 30 coupled with the rotor 22 of the drive motor 20 rotates. As the drive shaft 30 rotates, the refrigerant is sucked through the suction pipe 84. Some of the sucked refrigerant flows into the scroll compression unit through the suction chamber 82, and some of the refrigerant is moved to the oil reservoir 12.

The refrigerant moved to the scroll compression unit is compressed to high pressure by the swinging motion of the swing scroll 50, and the compressed refrigerant is collected at the center of the scroll. The collected high pressure refrigerant is moved to the discharge chamber 94 through the discharge port 92. Finally, some of the refrigerant and the oil accumulated in the discharge chamber 94 are discharged to the outside of the compressor through the discharge tube 96, and the other part of the oil and the oil recovery device (98) through the oil recovery tube 98 100) It will flow inside.

Meanwhile, the refrigerant and oil introduced into the oil recovery device 100 are temporarily stored in the oil recovery device 100. In addition, when the temperature of the oil reservoir 12 is lowered to a predetermined temperature or less so that a phase separation phenomenon between the refrigerant stored in the oil reservoir 12 and oil may occur, the refrigerant stored in the oil recovery device 100 may be used. And oil are discharged to the oil reservoir 12. In addition, the discharged refrigerant and oil increase the temperature of the oil reservoir 12, thereby preventing phase separation between the refrigerant and the oil stored in the oil reservoir 12.

2 is a plan view illustrating a process of compressing a refrigerant in the scroll compression unit according to the present invention.

Referring to FIG. 2, the scroll compression unit according to the present invention is formed in a spiral shape on a fixed scroll wrap 62 formed in a spiral shape on a lower side of the fixed scroll 60, and on an upper side of the pivoting scroll 50. A rotating scroll wrap 52 inserted into the fixed scroll wrap 62 by 180 degrees and a discharge port 92 formed at an inner central portion of the fixed scroll wrap 62 are included.

With this configuration, a process of compressing the refrigerant will be described.

First, the pivoting scroll 50 is eccentric about the drive shaft 30 to pivot (idle). Then, as the orbiting scroll 50 is pivoted by the rotation of the drive shaft 30 with respect to the fixed scroll 60, pockets 91 are formed in which the respective wraps 52 and 62 make surface contact with each other to compress the refrigerant. do.

In addition, the formed pocket 91 returns to the center of the scroll wrap and becomes smaller in volume, and as the volume becomes smaller, high pressure is formed, and the formed high-pressure fluid is discharged through the discharge port 92 in the center of the scroll member. Moved to chamber 84.

Hereinafter, the structure of the oil recovery device 100 will be described in detail.

3 is a cross-sectional view showing the structure of an oil recovery apparatus according to the present invention.

3, the oil recovery device 100 according to the present invention is connected to the discharge chamber 94 by the oil recovery pipe 98 is connected to the upper side.

The oil recovery device 100 includes a case 110 including an upper case 112 and a lower case 114, and a chamber 120 in which a high temperature refrigerant and oil introduced from the discharge chamber 84 are stored. And a discharge port 116 for discharging the refrigerant and oil in the chamber 120 to the oil reservoir 12, and a valve 130 for opening and closing the discharge port 116.

In addition, the valve control unit 132 for controlling the opening and closing of the valve 130, and the valve control unit 132 is in communication with the oil reservoir 12 so as to react according to the environment of the oil reservoir 12. The communication hole 118 is included.

In detail, the upper case 112 and the lower case 114 are coupled by the fastening member 140. In addition, one side of the valve 130 is fixed to the lower side of the chamber 120 by the fastening member 140.

In addition, the chamber 120 is formed by the combination of the upper case 112 and the lower case 114, and is a space in which the high temperature refrigerant and oil introduced from the discharge chamber 84 are temporarily stored. In addition, the refrigerant and the oil in the chamber 120 are discharged to the oil reservoir 12 by the operation of the valve 130.

In addition, the valve control unit 132 is provided at the lower side of the valve 130, and communicates with the oil reservoir 12 through the communication hole 118 to the temperature state of the oil reservoir 12. Configured to operate accordingly.

Here, the communication hole 118 is in communication with the oil reservoir 12 to increase the temperature responsiveness of the valve control unit 132 in addition to the valve control unit 132 is deformed to the valve 130 In the case of operating it also serves to discharge a predetermined amount of refrigerant and oil through the communication hole 118 to the oil reservoir (12).

That is, the outlet 116 serves as a main outlet, and the communication hole 118 serves as a secondary outlet.

In more detail, the valve adjusting unit 132 may be a shape memory alloy or bimetal. Here, when the shape memory alloy is used as the valve control unit 132, the shape memory alloy is deformed when the temperature of the oil reservoir 12 is below a predetermined temperature, and the temperature of the oil reservoir is It is configured to return to the original shape when the normal temperature is reached.

On the other hand, when the bimetal is used as the valve control unit 132, a metal having a large coefficient of thermal expansion is disposed on the upper side of the two metal plates, and a metal having a small coefficient of thermal expansion is disposed on the lower side.

Therefore, when the temperature of the oil reservoir 12 is below a predetermined temperature, the valve 130 is operated by the valve adjusting unit 132, and the valve 130 opens the outlet 116. The high temperature refrigerant and oil in the chamber 120 are discharged to the oil reservoir 12.

Hereinafter, the operation and function of the oil recovery device 100 will be described.

4 is a view showing an operating state of the oil recovery device according to the present invention.

Referring to FIG. 4, first, when the compressor 1 is driven, the refrigerant is sucked through the suction pipe 84. At this time, when the compressor 1 is driven under a low temperature heating operation condition, a low temperature liquid refrigerant flows into the suction pipe 84. Some of the sucked refrigerant flows into the scroll compression unit through the suction chamber 82, and some of the refrigerant is moved to and stored in the oil reservoir 12.

The refrigerant moved to the scroll compression unit is compressed to high pressure by the swinging motion of the swing scroll 50, and the compressed refrigerant is moved to the discharge chamber 94 through the discharge port 92. A portion of the refrigerant and oil accumulated in the discharge chamber 94 is discharged to the outside of the compressor 1 through the discharge tube 96, and the other part is recovered through the oil recovery tube 98. It enters the device 100 and is stored in the chamber 120.

On the other hand, in the case of low temperature heating operation conditions, the low temperature refrigerant is over-deposited in the oil reservoir 12, and the temperature of the oil reservoir 12 is lowered to a predetermined temperature or less, so that the oil stored in the oil reservoir 12 When the refrigerant is phase-separated, the high temperature refrigerant and oil stored in the chamber 120 are discharged to the oil reservoir 12 by the oil recovery device 100.

In detail, when the temperature of the oil reservoir 12 is less than or equal to a predetermined temperature, the valve control unit 132 in communication with the oil reservoir 12 is deformed in response to the temperature by the communication hole 118. Operate the valve 130. That is, the valve adjusting part 132 is bent upward, lifting the valve 130, and the outlet 116 is opened by the raised valve 130. Here, since one side of the valve 130 is fixed by the fastening member 140, the other side may be lifted by the valve adjusting unit 132.

Then, the hot refrigerant and oil stored in the chamber 120 are discharged to the oil reservoir 12 through the outlet 116. In this case, a predetermined amount of the refrigerant and the oil stored in the chamber 120 may be discharged to the oil storage part 12 through the communication hole 118.

When the high temperature refrigerant and the oil are discharged to the oil storage unit 12, the oil storage unit 12 having a low temperature increases in temperature by a mixture of the high temperature refrigerant and the oil and the oil storage unit. The refrigerant and oil stored in 12 are prevented from being phase separated.

Therefore, the high temperature refrigerant and oil of the discharge chamber 94 are bypassed to the oil reservoir 12 by the oil recovery device 100 to increase the temperature of the oil reservoir 12, thereby increasing the temperature of the oil. The phase separation of the refrigerant and the oil stored in the oil storage part 12 is prevented, and thus the phenomenon in which only the refrigerant is pumped by the oil pump 70 can be prevented.

In addition, as the refrigerant and the oil in the discharge chamber 94 are recovered to the oil reservoir 12 by the oil recovery device 100, stable supply of oil is possible.

5 is a cross-sectional view of an oil recovery device according to another embodiment of the present invention, Figure 6 is a view showing the operating state of the oil recovery device according to another embodiment of the present invention.

5 and 6, the oil recovery apparatus according to the present embodiment is formed in the case 210 and the case 210, and stores the refrigerant and the oil having a high temperature flowing from the discharge chamber 94. The chamber 220, a discharge port 216 for discharging the refrigerant and oil stored in the chamber 220 to the oil storage part 12, and a valve 230 for opening and closing the discharge port 216. .

That is, unlike the original embodiment, the valve control unit is not provided separately, and the valve 230 is configured to operate in response to the environment of the oil reservoir 12. That is, the valve 230 is a shape memory alloy or bimetal is used, and is modified according to the temperature state of the oil reservoir 12, thereby opening the outlet 216. The outlet 216 communicates with the oil reservoir 12 in addition to the refrigerant and the oil stored in the chamber 220 to be discharged into the oil reservoir 12, thereby responsive to the temperature of the valve 230. Let this be improved.

Referring to the operation of the oil recovery device 200 by the above configuration, when the refrigerant is discharged to the discharge chamber 94 through the compression process, the high temperature refrigerant and oil accumulated in the discharge chamber 94 is oil It is introduced into the chamber 220 through the recovery pipe (98). At this time, when the compressor 1 is operated under a low temperature heating condition and the temperature of the oil reservoir 12 drops below a predetermined temperature, the valve 230 is deformed, and thus the outlet 216 is opened. The high temperature refrigerant and oil stored in the chamber 220 are discharged to the oil reservoir 12 through the open outlet 216. Then, the temperature of the oil reservoir 12 is increased, and phase separation between the refrigerant and the oil stored in the oil reservoir 12 is prevented.

Therefore, according to this embodiment, the configuration of the oil recovery device 200 is simplified, and the valve 230 operates according to the environment of the oil reservoir 12 to open the outlet 216 to open the valve ( 230 has an advantage that can be more sensitive to the environment of the oil reservoir (12).

The present invention is configured such that the hot refrigerant and oil discharged to the discharge chamber are recovered to the oil reservoir by the oil recovery pipe and the oil recovery device.

Therefore, when the compressor is operated under a low temperature heating condition and the temperature of the oil reservoir is lowered to be a condition in which the refrigerant and the oil of the oil reservoir are phase separated, the refrigerant having a high temperature accumulated in the discharge chamber by the oil recovery device and As the oil is recovered and discharged into the oil reservoir, the phase separation between the refrigerant and the oil stored in the oil reservoir may be prevented.

In addition, as the phase separation between the refrigerant and the oil stored in the oil storage unit is prevented, the phenomenon in which only the refrigerant is pumped by the oil pump is prevented, and oil can be smoothly supplied.

In addition, as the refrigerant and the oil accumulated in the discharge chamber are recovered to the oil reservoir by the recovery device, there is an effect that stable oil supply is possible.

In addition, as the oil is smoothly supplied and lubrication is performed well on the friction part, the performance and reliability of the compressor are improved as a result.

Claims (10)

A scroll compression unit including a fixed scroll and a swing scroll for pivoting the fixed scroll to compress the refrigerant; A discharge chamber through which the refrigerant compressed by the scroll compression unit is discharged; An oil recovery tube communicating with the discharge chamber to allow a high temperature refrigerant and oil to flow in; And And an oil recovery device communicating with the oil recovery pipe and configured to discharge the high temperature refrigerant and oil introduced through the oil recovery pipe to the oil storage part. The oil recovery device, the case, A chamber formed inside the case and storing a high temperature refrigerant and oil recovered by the oil recovery pipe; An outlet for discharging high temperature refrigerant and oil stored in the chamber; And a valve for opening and closing the outlet. The method of claim 1, The oil recovery device is a scroll compressor provided in the oil reservoir. delete The method of claim 1, The valve is a scroll memory alloy (Shape memory alloy) or bimetal (Bimetal). The method of claim 1, And the valve opens the outlet when the temperature of the oil reservoir is below a predetermined temperature. The method of claim 1, The oil recovery device The scroll compressor further comprises a valve control unit for controlling the operation of the valve. The method of claim 6, And the valve control part is a shape memory alloy or a bimetal. The method of claim 6, And a communication hole formed in the case to communicate the valve control part with the oil reservoir. The method of claim 6, The outlet is the main outlet opening and closing by the valve, Scroll compressor including an auxiliary outlet opening and closing by the valve control unit. delete

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