KR101085900B1 - Compressor Distributing Apparatus And Refrigerator - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a compressor homogenizer for achieving equalization of refrigerator oil between outdoor units with a simple configuration.

The compressor milking device of the present invention is provided for each outdoor unit. Each compressor homogenizer has a gas-liquid separation means connected to the compressor, an oil return pipe connecting the first outlet end of the gas-liquid separation means and the suction branch pipe of the compressor, and a fluid oil pipe connected to the second outlet end of the gas-liquid separation means. The fungal oil pipe is connected to the discharge pipe.

Compressor, Gas-liquid Separation Means, Oil Bottle, Capillary Tube

Description

Compressor Distributing Apparatus And Refrigerator

1 is a view showing the configuration of a refrigeration machine and a compressor milking device according to an embodiment of the present invention.

2 is a view showing the volume range of the gas-liquid separation means.

3 is a view for explaining the action of the gas-liquid separation means of the compressor oil mixture device.

4 is a view for explaining the action of the gas-liquid separation means of the compressor oil mixture device.

**** Description of the symbols for the main parts of the drawings ****

1: freezer 2, 3, 4: outdoor unit

5: assembly gas pipe 6: assembly liquid pipe

7: outdoor unit 10: first compressor

11: second compressor 23: suction pipe

27: high pressure vessel 30: third compressor

31: fourth compressor 40: fifth compressor

41: sixth compressor 52, 53, 54: compressor homogenizer

63: gas-liquid separation means 63B: first outflow end

63C: second outflow end 65: capillary tube (first pressure reducing means)

66: fungus tube 67: capillary tube (second pressure reducing means)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor homogenizer for equalizing refrigeration oil between compressors of a plurality of outdoor units, and a refrigerator having a compressor homogenizer.

In a refrigerator, when a refrigerant is circulated using a plurality of compressors, the refrigerant oil may be uneven between the compressors, and the refrigerator oil of a specific compressor may be insufficient. In order to eliminate the non-uniformity of the refrigeration oil in this way, for example, the refrigerator of Japanese Patent Application Laid-Open No. 2000-220892 discloses that a device for balancing the refrigeration oil between compressors is provided. This type of refrigerator is equipped with a oil level detector for detecting the oil level of the refrigeration oil in the compressor, and when the oil level detector detects the lack of the refrigerant oil, the compressor is stopped to lower the pressure of the refrigeration oil reservoir. In addition, the oil level detector detects a compressor that has stored excess refrigeration oil, and operates the compressor to increase the pressure of the storage portion. The opening and closing sides of the connecting pipes connected between the storage portions of the plural compressors are opened and controlled to move the refrigeration oil from the high pressure compressor to the low pressure compressor.

Therefore, the refrigeration oil of the high pressure compressor decreases, and the refrigeration oil of the low pressure compressor increases by that amount.

In addition, Japanese Patent Laid-Open No. 6-280768 discloses that rotor blades for freezing refrigeration oil are provided in the compressor rotor instead of making a uniform oil pipe or oil level detector in the compressor. The rotor blades are arranged so as to scatter the lubricant when the lubricant reaches a predetermined storage position. As lubricating oil is scattered in the rotor blades, the amount of lubricating oil discharged with the refrigerant in the discharge pipe of the compressor increases, so that the amount of lubricating oil of the compressor can be reduced, and consequently, the lubricating oil of the other compressor increases.

In the refrigerator disclosed in Japanese Patent Laid-Open No. 2000-220892, it is expensive because the surface detectors are made in all compressors and the opening and closing valves are controlled based on the detection result of the surface detectors. In addition, although the differential pressure between the several compressor storage part is used for the movement of refrigeration oil, in order to generate this differential pressure, the compressor lacking refrigeration oil had to be stopped. However, if the compressor is stopped for the oil, the cooling capacity and the heating capacity decrease during that time. In addition, the connector had to be connected to connect a plurality of outdoor units, and this work had to be performed locally.

In addition, since the compressor disclosed in Japanese Patent Laid-Open No. 6-280768 has a special configuration, it is required to make it possible to provide oil with a compressor having a high versatility.

This invention is made | formed in view of such a situation, The objective is to aim at equalizing the refrigeration oil between outdoor units stably with a simple structure.

The present invention for solving the above problems is connected to a plurality of outdoor unit and the indoor unit between the gas pipe and the liquid pipe, the refrigerant mounted in the outdoor unit by suction and pressurize the refrigerant through the suction pipe through the suction pipe to discharge the refrigerant by circulating It is used, it is a compressor homogeneous device for maintaining the refrigeration oil evenly between the compressor, has a gas-liquid separation means connected to the high-pressure vessel of the compressor, the gas-liquid separation means mainly the first outflow end for outflowing the refrigeration oil, and When the gas is discharged and the gas-liquid separation means is filled with the refrigeration oil, it is provided with a second outflow end for outflowing the refrigeration oil, and the first outflow end receives the refrigerant to the compressor in the suction pipe through the first pressure reducing means. The discharge pipe of the compressor connected to a portion to be supplied; It is connected to the compressor homogenizer characterized in that.

When the oil level of the refrigeration oil of the compressor is lower than the connection height of the pipe connected to the inlet end of the gas-liquid separation means, the compressor homogenizer is introduced into the gas-liquid separation means, and the mist of the freezer oil enters the gas-liquid separation means. Separation means are separated from the refrigerant and returned to the original compressor. On the other hand, when the refrigeration oil surface of the compressor is higher than the pipe connection height, the refrigeration oil flows into the gas-liquid separation means, and the refrigeration oil flows out into the homogeneous oil pipe. The refrigeration oil flowing out into the fungal oil pipe is sucked into the discharge pipe, circulated with the high pressure gas refrigerant, and distributed to the plurality of compressors.

Best Mode for Carrying Out the Invention The best embodiment for carrying out the invention will be described in detail with reference to the drawings.

1 shows a configuration of a refrigerator according to an embodiment of the present invention. In the refrigerator 1, three outdoor units 2 to 4 are connected in parallel to the collective gas pipe 5 (gas pipe) and the collective liquid pipe 6 (liquid pipe), and the collective gas pipe 5 and the collective liquid pipe 6 are connected to each other. A plurality of indoor units 7 used indoors are connected in parallel. Such a refrigerator 1 is also called an outdoor multi air conditioner. In addition, the number of the outdoor units 2-4 and the number of the indoor units 7 are not limited to what was shown in figure.

The outdoor unit 2 is equipped with a first compressor 10 and a second compressor 11. The first and second compressors 10 and 11 are high-pressure shell compressors, and the first and second pipes 14A and 14B of the discharge pipe 14 are connected to each discharge port, respectively. The discharge pipe 14 is connected to the first port 16A of the four sides 16 with the oil separator 15 therebetween after the first pipe 14A and the second pipe 14B join together. The four sides 16 has four ports, and when the first port 16A and the second port 16B are connected, the third port 16C and the fourth port 16D are connected, and the first port 16A is connected. ) And the fourth port 16D are switched so that the second port 16B and the third port 16C are connected. The second port 16B of the four sides 16 is connected to the liquid pipe 6A with the outdoor heat exchanger 17 therebetween. The liquid pipe 6A is connected to the collection liquid pipe 6, and an outdoor pressure reducing device 18 is provided in the pipe line.

The collective liquid pipe 6 is connected to the liquid pipe 6A in each outdoor unit 2 to 3 and is branched into three liquid pipes 6B on the indoor unit 7 side, and these liquid pipes 6B are three indoor units ( It is drawn one by one in 7) and is connected to the indoor side pressure reduction apparatus 20 of each indoor unit 7, respectively.

In the indoor unit 7, the indoor pressure reducing device 20 and the indoor heat exchanger 21 are connected in series, and the indoor heat exchanger 21 is connected to the gas pipe 5B of the collective gas pipe 5.

The gas pipe 5B is connected to the collective gas pipe 5. The aggregated gas pipe 5 is branched into three gas pipes 5A on the outdoor unit 2 side, and these gas pipes 5A are introduced into the outdoor units 2 to 4 one by one to the fourth port 16D of the four sides. ) The suction pipe 23 is connected to the third port 16C of the four sides 16. The suction pipe 23 is a pipe through which refrigerant sucked into the first and second compressors 10 and 11 passes after heat exchange. After the oil return pipe 24 joins in the oil separator 15, the first and second compressors are connected. Branched into two suction branch pipes 23A and 23B with respect to the two compressors 10 and 11. In addition, the oil return pipe 24 is provided with decompression means 25 such as a capillary tube on the pipeline.

Each suction branch pipe 23A of the suction pipe 23 is connected to the high pressure vessel 27 of the first and second compressors 10 and 11. Only the refrigerant sucked by the corresponding one compressor (10, 11) flows through each suction branch pipe (23A). In the high pressure vessel 27 of each of the first and second compressors 10 and 11, a predetermined amount of refrigerator oil is accommodated. In addition, the outdoor unit 3 has a third compressor 30 and a fourth compressor 31 which are high-pressure shell compressors, and have the same configuration as the outdoor unit 2. The outdoor unit 4 has the same structure as the outdoor unit 2 with the 5th compressor 40 and the 6th compressor 41 which are the high pressure shell type compressors.

Here, the refrigerator 1 has a built-in compressor milk oil device 52 to 54 for each of the outdoor units 2 to 4.

The compressor oil mixture device 52 has a connection pipe 62 connected at a predetermined height at the bottom of the high pressure vessel 27 of the first compressor 10. This connecting pipe 62 is connected to the inflow end of the gas-liquid separation means 63. The gas-liquid separation means 63 is configured to separate the fluid mixed with the gas-liquid into a gas and a liquid, for example, using a centrifugal force. In the gas-liquid separation means 63, an oil return pipe 64 is connected to the first outflow end where the liquid mainly flows out. The oil return pipe 64 is connected to the suction branch pipe 23A after the capillary tube 65 serving as the decompression means is installed in the pipeline. Moreover, this suction branch pipe 23A is a pipe through which only the refrigerant sucked into the first compressor 10 flows through. Although it is connected to the accumulator 28 provided on the piping of 23 A of suction branch pipes in FIG. 1, you may be connected to piping parts other than the accumulator 28. FIG. On the other hand, in the gas-liquid separation means 63, a bacteria oil pipe 66 is connected to the second outflow end where the gas mainly flows out. The fungal oil pipe 66 is connected to the first pipe 14A of the discharge pipe 14.

A connection tube 62 is connected to the second compressor 11 at a predetermined height at the bottom of the high pressure vessel 27, and the connection tube 62 is connected to an inflow end of the gas-liquid separation means 63. .

An oil return pipe 64 is connected to the first outflow end of the gas-liquid separation means 63. The oil return pipe 64 is provided with a capillary tube 65 and is connected to the accumulator 28 of the suction branch pipe 23B through which the refrigerant sucked only by the second compressor 11 passes. A fungal oil pipe 66 is connected to the second outflow end of the gas-liquid separation means 63. This fungal oil pipe 66 is connected to the second pipe 14B of the discharge pipe 14.

Similarly, the compressor milking device 53 has gas-liquid separation means 63 connected to the connection pipe 62 at a predetermined height at the bottom of the high pressure vessel 27 of the third compressor 30. The oil return pipe 64 on the first outflow end side of the gas-liquid separating means 63 is connected to the suction branch pipe 23A of the third compressor 30 after the capillary tube 65 is provided. The 2nd outflow-end side fluid oil pipe 66 of the gas-liquid separation means 63 is connected to the 1st piping 14A of the discharge piping 14. As shown in FIG. Similarly, the fourth compressor 31 side also has the gas-liquid separator stage 63 connected to the fourth compressor 31 from the connecting pipe 62, the oil return pipe 64, the funnel oil pipe 66, and the capillary tube ( Have 65). The oil return pipe 64 is connected to the suction branch pipe 23B of the fourth compressor 31. The fungal oil pipe 66 is connected to the second pipe 14B of the discharge pipe 14.

Compressor milking device 54 is a gas-liquid separation means 63 and oil return pipe 64, the funnel oil pipe 66 and the capillary tube 65, 67 connected to the connecting pipe 62 to the fifth compressor (40) Has) The oil return pipe 64 is connected to the suction branch pipe 23A of the fifth compressor 40. The fungal oil pipe 66 on the second outflow end side of the gas-liquid separation means 63 is connected to the first pipe 14A of the discharge pipe 14. Moreover, it has the gas-liquid separation means 63, the oil return pipe 64, the funnel oil pipe 66, and the capillary tube 65 connected to the 6th compressor 41 by the connection pipe 62. As shown in FIG. The oil return pipe 64 is connected to the suction branch pipe 23B of the sixth compressor 41. The fungal oil pipe 66 is connected to the second pipe 14B of the discharge pipe 14.

In the capillary tube 65, the pressure of the refrigerant or the refrigerant oil is higher than the internal pressure of the high pressure vessel 27 of each compressor 10, 11, 30, 31, 40, 41 and the internal pressure of the gas-liquid separation means 63. While the pressure is reduced to lower, the pressure of the refrigerant or the refrigerant oil is set to be higher than the internal pressure of the suction pipe 23 and the suction branch pipes 23A and 23B. In addition, the capillary tube 65 has a predetermined flow rate of the refrigerant flowing through each of the compressor fuel oil devices 52, 53, and 54 with respect to the refrigerant flow rate flowing through the main circuit through the indoor and outdoor heat exchangers 17 and 21. The flow path resistance is set to be below the ratio. The capillary tube 65 also functions as a flow rate adjusting means for adjusting the flow rate of the refrigeration oil passing through the oil return tube 64.

In addition, the volume of the gas-liquid separation means 63 is less than or equal to the predetermined volume with respect to the required minimum flow rate of each compressor (10, 11, 30, 31, 40, 41). More specifically, it is between the gas-liquid separation means volume range R1 shown in FIG. In this embodiment, the lower limit of the gas-liquid separation means volume range R1 is a volume equivalent to 5% of the refrigeration oil. In addition, the upper limit of the gas-liquid separation means volume range R1 is a volume equivalent to 20% of refrigerator oil. If the volume of the gas-liquid separation means 63 is less than the lower limit, the separation performance of the liquid and gas is deteriorated, which is not preferable. In addition, when the volume of the gas-liquid separating means 63 exceeds the upper limit, excess refrigerant oil is retained in the gas-liquid separating means 63, and the refrigeration oil necessary for the operation of each compressor 10, 11, 30, 31, 40, 41 is insufficient. It is not desirable because

Next, the operation of the present embodiment will be described.

First, the refrigerant flow at the time of operating three outdoor units 2-4 simultaneously and performing cooling operation and heating operation is demonstrated in order. On the other hand, cooling operation or heating operation is carried out while stopping one or two outdoor units 2-4 or stopping only one of the compressors 10, 11, 30, 31, 40, 41 of the outdoor units 2-4. It is also possible to do

During the cooling operation, the four sides 16 of the outdoor units 2 to 4 are switched to connect the first port 16A and the second port 16B, and the third port 16C and the fourth port 16D. Connect The high-pressure gas refrigerant discharged from the compressors 10, 11, 30, 31, 40, and 41 to the first and second pipes 14A and 14B receives the refrigeration oil mixed in the gas refrigerant in the oil separator 15. After separation it is directed from the four sides 16 to the outdoor heat exchanger 17. In the outdoor heat exchanger 17, the gas refrigerant is liquefied by heat exchange to form a high pressure liquid refrigerant. The liquid refrigerant joins in the collective liquid pipe 6 and is guided to the indoor unit 7 in operation. In the indoor unit 7, the liquid refrigerant is reduced in the indoor pressure reducing device 20 and then flows into the indoor heat exchanger 21. In the indoor heat exchanger 21, a low pressure liquid refrigerant is vaporized by heat exchange to form a low pressure gas refrigerant. At this time, the room is cooled by taking vaporization heat from ambient air. The low pressure gas refrigerant passes through the collective gas pipe 5 in the indoor heat exchanger 21 and is recovered while branching to each outdoor unit 2 to 4. In each outdoor unit 2, it is guided to the suction pipe 23 through the four sides 16 and sucked into each compressor 10, 11, 30, 31, 40, 41 through the suction branch pipes 23A, 23B. . Then, it is pressurized again and discharged to the discharge pipe 14.

When heating operation is performed in the refrigerator 1, the four sides 16 of each outdoor unit 2-4 are switched, the 1st port 16A and the 4th port 16D are connected, and the 2nd port 16B and the 3rd The port 16C is connected. The high pressure gas refrigerant discharged from the compressors 10, 11, 30, 31, 40, and 41 to the first and second pipes 14A and 14B joins the collective gas pipe 5 at the four sides 16 and operates. The indoor heat exchanger 21 of the indoor unit 7 is being guided. In the indoor heat exchanger 21, a gas refrigerant is liquefied to form a liquid refrigerant, and the room is heated by the heat of condensation emitted at this time. The liquid refrigerant is depressurized by the indoor pressure reducing device 20 and flows to the collective liquid pipe 6 as an intermediate pressure liquid refrigerant, branched to each outdoor unit 2 to 4, and recovered, and the outdoor pressure reducing device 18 and the outdoor heat exchanger. It passes through (17) and becomes a low pressure gas refrigerant. The gas refrigerant is sucked into the compressors 10, 11, 30, 31, 40, and 41 from the suction branch pipes 23A and 23B by passing through the suction pipe 23 from the four sides.

Then, it is pressurized again and discharged to the discharge pipe 14.

Thus, each compressor 10 is carried out by the compressor oil supply apparatus 52-54, maintaining the operation | movement state of each compressor 10, 11, 30, 31, 40, 41 while the refrigerator 1 is operating while circulating a refrigerant. , 11, 30, 31, 40, 41 equalization of the refrigeration oil is realized.

For example, when there is much refrigeration oil in the high pressure container 27 of the 1st compressor 10, and the oil surface is in the position higher than the connection position of the connection pipe 62 (hereinafter, such a state is called "freezer base oil surplus"). Only the refrigeration oil flows into the inflow end 63A of the gas-liquid separation means 63 from the connecting pipe 62. In this case, as shown in FIG. 3, the gas-liquid separation means 63 filled with the refrigeration oil flowing out of the high pressure vessel 27 of the first compressor 10 is filled with the first outflow end 63B and the second outflow end. Refrigerator oil flows out from the oil return pipe 64 and the fungal oil pipe 66 at 63C, respectively. The refrigeration oil flowing out of the oil return pipe 64 returns only to the first compressor 10 which is the original compressor. The fungal oil pipe 66 is connected to the first pipe 14 of the discharge pipe 14, and since the high-pressure gas refrigerant flows at high speed through the first pipe 14A, the refrigeration oil in the fungal oil pipe 66 is the first. It is sucked into the pipe 14A. The refrigeration oil sucked into the first pipe 14A becomes a mist phase, and together with the gas refrigerant, the collective gas pipe 5, the assembly liquid pipe 6, the indoor unit 7, and the outdoor heat exchanger 17 are connected at four sides 16. It circulates and is distributed to each outdoor unit (2-4). At this time, the refrigerator oil mixed with the refrigerant is almost evenly distributed to the outdoor units 2 to 4. The refrigerant oil is sucked into the compressors 10, 11, 30, 31, 40, 41 through the suction branch pipes 23A, 23B in the suction pipe 23 together with the gas refrigerant. As a result, the refrigerant oil of the compressor (in this case, the first compressor 10) in which the refrigerant oil is excessively decreases, and the refrigerant oil of the other compressor gradually increases.

In addition, as shown in FIG. 4, when the refrigeration oil in the high pressure container 27 of the 1st compressor 10 is small, for example, and the oil surface is in the position lower than the connection position of the connection pipe 62 (it follows, This state is referred to as "freezing base oil is not more than a predetermined amount"), the oil mist of the gas refrigerant and the refrigeration oil mixed in the gas refrigerant flows into the gas-liquid separation means 63 through the connecting pipe 62. The gas-liquid separation means 63 separates the oil mist and the gas refrigerant. The oil mist flows out of the oil return pipe 64 at the first outflow end 63B, passes through the oil return pipe 64, and returns from the suction branch pipe 23A to the first compressor 10 which is the original compressor. Therefore, the refrigeration oil mixed in the gas refrigerant in the first compressor 10 is recovered to the first compressor 10 itself. Thereby, the outflow of the refrigeration oil in the 1st compressor 10 is prevented, and the fall of the oil level in the high pressure container 27 is prevented. In addition, the refrigerant separated by the gas-liquid separation means 63 is sucked into the first pipe 14A through the funnel oil pipe 66 at the second outflow end 63C and discharged from the first compressor 10. The refrigerator 1 is circulated with the gas refrigerant.

Similarly with respect to the other compressors 11, 30, 31, 40, 41, when the amount of the refrigeration oil is larger than the predetermined amount, that is, the amount of the refrigeration oil is excessive, the refrigeration oil flowing out to the gas-liquid separation means 63 passes through the homogenizing pipe 66 and is discharged. It is absorbed by the piping 14 (the 1st piping 14A or the 2nd piping 14B), and passes through the indoor unit 7, and distributes to each compressor 10, 11, 30, 31, 40, 41. On the other hand, when the refrigeration oil is less than the predetermined amount, it is returned to the original compressor only through the oil return pipe (64). Therefore, in the process of operating the refrigerator 1, the refrigerator oil of each compressor 11, 30, 31, 40, 41 is equalized. In addition, since the oil separator 15 is provided in the discharge pipe 14, some of the refrigeration oil is refluxed by the oil separator 15 to the compressors 11, 20, 21, 30, and 31.

In the present embodiment, in the configuration having a plurality of outdoor units (2 to 3), the compressor gasoline devices (52 to 54), the discharge gas pipe 14, the collective gas pipe 5, the collective liquid pipe 6, the indoor unit (7) ), The surplus refrigeration oil is transferred to other compressors (10, 11, 30, 31, 40, 41), so each compressor (10, 11, 30, 31, 40, 41) is not controlled. Refrigeration oil of) can be equalized. Since a special configuration is not necessary for the compressors 10, 11, 30, 31, 40, and 41, it can be manufactured at low cost with high versatility. Since there is no need to make new pipes between the outdoor units 2 to 4 for the compressor milking devices 52 to 54, the construction can be simplified when the refrigerator 1 is installed. In addition, it is possible to flexibly cope with a change in the number of outdoor units and a change in the layout.

The present invention is not limited to the above embodiment and can be applied null.

For example, you may connect the bacteria oil pipe 66 to the part which the discharge piping 14 joins.

The compressors 10, 11, 30, 31, 40, 41 for each of the outdoor units 2-4 are not limited to two. One may be sufficient and three or more may be sufficient. One outdoor unit 2-4 may be sufficient. In this case, the refrigeration oil of the multiple compressor mounted in the same outdoor unit passes through the indoor unit 7 and is equalized.

The capacity of the gas-liquid separating means 63 can be selected to an optimum volume according to the refrigerator, and may be other than the gas-liquid separating means volume range R1 as long as it is equal to or lower than the minimum flow rate required for the operation of the compressor.

The first and second pressure reducing means may be an expansion valve, an opening valve, or other pressure reducing means instead of the capillary tubes 65 and 67.

According to the present invention, since refrigeration oil does not flow out from a compressor having less freezer oil, and freezer oil flows out and is distributed to another compressor including another outdoor unit in a compressor having a lot of freezer oil, the flow rate of the freezer of the compressor in a refrigerator having a plurality of outdoor units is controlled to a predetermined amount. I can keep it. In addition, the flow rate of the refrigerators of the plurality of compressors can be maintained at a predetermined amount without any special operation control as in the prior art. Therefore, stable operation can always be realized with a simple configuration. Moreover, homogenization can be achieved without the compressor having a special shape. It is possible to equalize the refrigeration oil only by connecting the gas pipe and the liquid pipe to the outdoor unit. Therefore, the outdoor unit can be made cheap, and the installation work becomes easy. It is possible to flexibly cope with a change in layout or a change in the number of outdoor units.

Claims (3)

A plurality of outdoor units having at least one compressor, a plurality of indoor units connected to the plurality of outdoor units through gas and liquid pipes, suction pipes connected to the compressors so that refrigerant is sucked into each of the compressors mounted on the plurality of outdoor units; A compressor homogenizer for maintaining a refrigerator oil evenly between the compressors, the refrigerator being used in a refrigerator including discharge pipes connected to the compressors to discharge and circulate the refrigerant pressurized by the compressors. A gas-liquid separation means connected to the high pressure vessel of each compressor through a connection pipe and configured to separate gas and liquid from the fluid flowing from each compressor; and An oil return pipe connecting the gas-liquid separation means and the suction pipe and including a decompression means; and Includes; a fungal oil pipe connecting the gas-liquid separation means and the discharge pipe; The gas-liquid separation means includes a first outlet connected to the oil return pipe so that at least a portion of the refrigeration oil introduced into the gas-liquid separation means is returned to the compressor connected to the suction pipe, and the freezer when the gas-liquid separation means is full. A second outflow end connected to the fungal oil pipe to outflow the oil, The refrigeration oil discharge device, wherein the refrigeration oil discharged to the fungal oil pipe through the second discharge end is circulated through the discharge pipe, the liquid pipe, the gas pipe, and the indoor unit and distributed to each compressor mounted on the plurality of outdoor units. . A refrigerator according to claim 1, wherein a plurality of the compressors to which the compressor fuel oil device of claim 1 is connected are mounted in one outdoor unit. A refrigerator comprising: a plurality of outdoor units equipped with the compressor to which the compressor oiling apparatus according to claim 1 is connected.

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