JP2006125715A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of preventing outflow of oil in a compressor to the outside when disconnect between the compressor and an oil pipe even when there is oil excessiveness in the compressor to be removed due to fluctuation of oil levels between compressors. <P>SOLUTION: The air conditioner is provided with a plurality of compressors including a high pressure container compressor, and the plurality of compressors are connected via the oil pipe. It is characterized by that a relay pipe 61 with an extended upper end is connected to an oil removing pipe 60 of the high pressure container compressor 20 at substantially the same position as a connecting position 87 of a discharge pipe 76 of the high pressure container compressor 20, or at a position higher than the connecting position 87 of the discharge pipe 76, and the oil pipe 62 is connected to the upper end of the relay pipe 61. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air conditioner including a plurality of compressors including a high-pressure vessel compressor, and connecting these compressors with an oil pipe.

  Conventionally, an air conditioner including a plurality of compressors including a high-pressure vessel compressor and connecting the plurality of compressors via an oil pipe is known (for example, see Patent Document 1). In this type of air conditioner, since a plurality of compressors are provided in the same system through which refrigerant flows, if the oil (lubricating oil) in one of the compressors is insufficient during operation, The surplus oil can be supplied to the compressor having insufficient oil through the oil pipe.

  By the way, when connecting a plurality of compressors via an oil pipe, one end of the oil pipe is connected to an oil take-out pipe of the compressor provided in advance when the compressor is shipped by welding or brazing. The other end of the oil pipe is connected to another compressor by welding or brazing. For example, when the oil take-out pipe is connected to a high-pressure vessel of a compressor, the connection position is connected to a low position of the high-pressure vessel in order to facilitate the inflow and outflow of oil.

Here, when the length of the oil take-out pipe is set to be long, the oil take-out pipe may be damaged by vibration of the oil take-out pipe when the compressor is transported alone. Further, if the oil take-out pipe is fixed and protected in order to prevent the damage, these fixing and protecting members are required, resulting in an increase in the number of parts and cost. Also, if the length of the oil take-out pipe is long, it becomes difficult to route the oil pipe and the refrigerant pipe when the compressor is incorporated in the outdoor unit, and complicated piping work is required. In order to solve these problems, the length of the oil take-out pipe is conventionally set to be relatively short. Accordingly, one end of the oil pipe is connected to the oil take-out pipe having a short length at a low position.
JP 2000-337726 A

Conventionally, when the compressor is removed because of a failure or maintenance of the compressor, the oil take-out pipe and the oil pipe are sometimes disconnected.
In this case, the oil level may be located above the connection position between the oil take-out pipe and the oil pipe due to fluctuations in the oil level between the compressors during the operation of the air conditioner. Occasionally, there is a problem that oil in the compressor flows out through the removed oil take-out pipe.

  Therefore, an object of the present invention is to solve the above-described problems of the conventional technology, and even if excessive oil is generated in the compressor to be removed due to fluctuations in the oil level between the compressors, An object of the present invention is to provide an air conditioner that can prevent the oil in the compressor from flowing out when the connection is removed.

  In order to solve the above-described problems, the present invention provides an air conditioner including a plurality of compressors including a high-pressure vessel compressor, and connecting the plurality of compressors via an oil pipe. Connected to the take-out pipe is a relay pipe whose upper end extends to a position substantially equivalent to the connection position of the discharge pipe of the high-pressure vessel compressor or higher than the connection position of the discharge pipe, and the upper end of the relay pipe It is characterized by connecting an oil pipe.

  In this case, it is good also as a structure provided with the receiving part in which the said oil pipe is inserted in the upper end of a relay pipe. The high-pressure vessel compressor may be a scroll compressor in which a suction pipe is provided on the upper surface of the high-pressure vessel and a discharge pipe is provided on the side surface of the high-pressure vessel.

  According to the present invention, even if excessive oil is generated in the removed compressor due to the fluctuation of the oil level between the compressors, the oil in the compressor is removed when the connection between the compressor and the oil pipe is disconnected. It is possible to prevent leakage to the outside.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a circuit diagram showing an embodiment of an air conditioner according to the present invention. The air conditioner 1 includes a plurality of (for example, two) outdoor units 2A and 2B and a plurality of (for example, two) indoor units 3A and 3B. The inter-unit piping 5 that connects the outdoor units 2A, 2B and the indoor units 3A, 3B includes a low-pressure gas pipe 6, a high-pressure gas pipe 7, and a liquid pipe 8. The air conditioner 1 includes the indoor unit 3A. 3B can be simultaneously operated for cooling or heating, or can be implemented by mixing these cooling and heating operations.

  The indoor unit 3A includes an indoor heat exchanger 10 and an indoor expansion valve 11. One end of the indoor heat exchanger 10 is connected to the liquid pipe 8 via a liquid branch pipe 18 provided with the indoor expansion valve 11. Connected. A branch pipe 12 is connected to the other end of the indoor heat exchanger 10, and the branch pipe 12 branches into a high-pressure gas branch pipe 12A and a low-pressure gas branch pipe 12B. The high-pressure gas branch pipe 12 </ b> A is connected to the high-pressure gas pipe 7 via the first on-off valve 13, and the low-pressure gas branch pipe 12 </ b> B is connected to the low-pressure gas pipe 6 via the second on-off valve 14. Further, a bypass pipe 15 that bypasses the second on-off valve 14 is connected in parallel to the low-pressure gas branch pipe 12B, and a capillary tube 16 and a third on-off valve 17 (balance valve) are connected to the bypass pipe 15. Is provided. In the present embodiment, the first on-off valve 13, the second on-off valve 14, and the third on-off valve 17 are arranged in a solenoid valve kit 19.

  The indoor unit 3A is provided with a temperature sensor that detects the inlet / outlet temperature and room temperature of the outdoor heat exchanger 21, a pressure sensor that detects the refrigerant pressure in the indoor heat exchanger 21, and the like. An indoor control device (not shown) for inputting the result and controlling the indoor unit 3A is provided. In addition, since the indoor unit 3B has substantially the same configuration as the indoor unit 3A, the same portions are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 2 is a circuit diagram showing a configuration of the outdoor unit 2A. The outdoor unit 2A includes a variable capacity compressor (DC inverter compressor) 20A, constant capacity compressors (AC compressors) 20B1 and 20B2, an outdoor heat exchanger 21, an outdoor expansion valve 22, and a receiver. It is generally composed of a tank 23 and the like. Hereinafter, the compressors 20 </ b> A, 20 </ b> B <b> 1, 20 </ b> B <b> 2 are referred to as the compressors 20 when it is not necessary to distinguish between them.

  In the outdoor unit 2A, the compressors 20A, 20B1, and 20B2 are connected in parallel, and the refrigerant suction pipe 30 that is commonly connected to the suction ports of the compressors 20A, 20B1, and 20B2 is connected to the low-pressure gas pipe 6 via the accumulator 24. Connected to. The refrigerant discharge pipe 31 connected to the discharge ports of the compressors 20A, 20B1, and 20B2 branches into two via the oil separator 25, and one refrigerant discharge branch pipe 31A is connected to the high-pressure gas pipe 7. The other refrigerant discharge branch pipe 31B is connected to the outdoor heat exchanger 21.

  Here, the refrigerant discharge branch pipe 31 </ b> B is provided with a switching valve 40, and when the switching valve 40 is opened, the refrigerant discharged from the compressor 20 is supplied to the outdoor heat exchanger 21. Further, the refrigerant discharge branch pipe 31B is provided with a four-way valve 41 between the switching valve 40 and the outdoor heat exchanger 21, and the four-way valve 41 is viewed from the outdoor heat exchanger 21 as an outdoor heat exchanger. Switching to selectively switch one end of the vessel 21 to one of the refrigerant discharge branch pipe 31B and the refrigerant discharge branch pipe 31A connected to the switching valve 40 or the heating path pipe 32 connected to the refrigerant suction pipe 30 of the compressor 20 Acts as a valve.

  The other end of the outdoor heat exchanger 21 is connected to the liquid pipe 8 via an outdoor expansion valve 26 for adjusting the flow rate of the refrigerant supplied to the outdoor heat exchanger 21, a receiver tank 23, and a trap pipe 27. The receiver tank 23 stores liquid refrigerant between the outdoor unit 2A and the indoor units 3A and 3B, and adjusts refrigerant supply and demand between the units.

  The oil separator 25 includes a refrigerant return pipe 45 for returning the excess oil amount to the refrigerant suction pipe of the compressor 20 when the amount of oil stored in the oil separator 25 is equal to or greater than a predetermined amount, and the oil separator 25 An oil balance pipe 46 for connecting the separator 25 and the oil separator 25 of the other outdoor unit 2B is connected. The oil balance pipe 46 is connected to the oil separator 25 of another outdoor unit 2B via an oil pipe 47, and between the oil separators 25 of the outdoor units 2A and 2B via the oil balance pipe 46 and the oil pipe 47. The oil flows back and forth, and the balance of the amount of oil stored in each oil separator 25 is ensured.

  The outdoor unit 2A includes a temperature sensor that detects an inlet / outlet temperature of the outdoor heat exchanger 21, a pressure sensor SA1 that detects a suction pressure of the compressor 20, a pressure sensor SB1 to SB3 that detects a discharge pressure of the compressor 20, and the like. Various sensors, a plurality of check valves, an outdoor control device 100 for controlling the entire outdoor unit 2A by inputting detection results of the various sensors, and the like are provided. In addition, since the outdoor unit 2B has the same configuration as the outdoor unit 2A, the same portions are denoted by the same reference numerals, and redundant description is omitted. The air conditioner 1 includes a remote controller (not shown), and the outdoor control device 100 of any of the outdoor units 2A and 2B receives another outdoor control device according to a user instruction or the like input via the remote controller. It communicates with 100 and an indoor control apparatus, and performs operation control of this air conditioning apparatus 1 whole.

Next, the operation of the air conditioner 1 will be described.
When all the indoor units 3A and 3B are cooled at the same time, in each outdoor unit 2A and 2B, the switching valve 40 is opened and the four-way valve 41 is controlled to be switched to the solid line position. Also, in each indoor unit 3A and 3B, the first The on-off valve 13 is closed, and the second on-off valve 14 and the third on-off valve 17 are opened. In this case, as indicated by solid line arrows in FIG. 1, the refrigerant discharged from the compressor 20 is supplied to the outdoor heat exchanger 21 via the oil separator 25, where heat is dissipated and condensed to form liquid refrigerant, and the receiver tank 23. Then, the liquid is supplied to the liquid pipe 8 through the auxiliary cooling circuit 28.

  In the indoor units 3A and 3B, the liquid refrigerant is supplied to the indoor heat exchanger 10 through the liquid pipe 8 and through the indoor expansion valve 11, where it absorbs heat and evaporates to become a low-temperature and low-pressure gas refrigerant. The gas is supplied to the low-pressure gas pipe 6 through the second on-off valve 14 and the third on-off valve 17. The gas refrigerant supplied to the low-pressure gas pipe 6 is compressed again by the compressor 20 via the refrigerant suction pipe 30 of the outdoor units 2A and 2B. As a result, all the indoor units 3A and 3B can simultaneously perform the cooling operation.

  On the other hand, when all the indoor units 3A and 3B are simultaneously heated, the switching valve 40 is closed and the four-way valve 41 is controlled to be switched to the broken line position in each of the outdoor units 2A and 2B. The on-off valve 13 is opened, and the second on-off valve 14 and the third on-off valve 15 are closed. In this case, the high-temperature and high-pressure gas refrigerant discharged from the compressor 20 is supplied to the high-pressure gas pipe 7 through the oil separator 25 as indicated by a wavy arrow in FIG.

  In the indoor units 3A and 3B, the gas refrigerant is supplied to the indoor heat exchanger 10 via the high-pressure gas pipe 7, and then, after radiating and condensing into liquid refrigerant, the indoor refrigerant is passed through the indoor expansion valve 11. And supplied to the liquid pipe 8. The liquid refrigerant supplied to the liquid pipe 8 is supplied to the outdoor heat exchanger 21 via the refrigerant pipes 33 of the outdoor units 2A and 2B, the receiver tank 23, and the outdoor expansion valve 26, where heat is absorbed and evaporated. Here, the refrigerant becomes a low-temperature and low-pressure gas refrigerant and is compressed again by the compressor 20 through the refrigerant suction pipe 30. Thereby, the heating operation can be simultaneously performed in all the indoor units 3A and 3B.

  Further, when performing a mixed operation of heating operation and cooling operation, for example, when the indoor unit 3A is operated for heating and the indoor unit 3B is operated for cooling, the outdoor units 2A and 2B are controlled in the same manner as in the above-mentioned simultaneous heating operation. On the other hand, in the indoor unit 3A, the first on-off valve 13 is closed, the second on-off valve 14 and the third on-off valve 17 are opened, and in the indoor unit 3B, the first on-off valve 13 is opened, and the second on-off valve 14 is opened. And the 3rd on-off valve 17 closes. In this case, high-temperature and high-pressure gas refrigerant is supplied from the outdoor units 2A and 2B to the high-pressure gas pipe 7, and in the indoor unit 3A, gas refrigerant is supplied to the indoor heat exchanger 10 via the high-pressure gas pipe 7. After being radiated / condensed to become a liquid refrigerant, it is supplied to the liquid pipe 8 through the indoor expansion valve 11. A part of the liquid refrigerant supplied to the liquid pipe 8 returns to the outdoor units 2A and 2B and is absorbed and evaporated by the outdoor heat exchanger 21 via the outdoor expansion valve 26 to become a low-temperature and low-pressure gas refrigerant.

  On the other hand, the remainder of the liquid refrigerant supplied to the liquid pipe 8 is supplied to the indoor heat exchanger 10 via the indoor expansion valve 11 of the indoor unit 3B, where it absorbs heat and evaporates to become a low-temperature and low-pressure gas refrigerant. Thereafter, the gas is supplied to the low pressure gas pipe 6 through the second on-off valve 14 and the third on-off valve 17. The refrigerant supplied to the low-pressure gas pipe 6 is compressed again by the compressor 20 through the refrigerant suction pipe 30 together with the gas refrigerant passed through the outdoor heat exchanger 21. Thereby, heating operation and cooling operation can be performed for each of the indoor units 3A and 3B.

  During the cooling and heating operations, the oil (lubricating oil) in the compressors 20A, 20B1, and 20B2 flows in the same system together with the refrigerant. Since the same system is provided with a plurality of compressors 20A, 20B1, and 20B2, there is a possibility that oil is biased and accumulated in any of the compressors 20A, 20B1, and 20B2 during operation. For this reason, in this embodiment, in order to adjust the oil amount which each compressor 20A, 20B1, 20B2 has substantially equally, it is set as the structure which connects the one compressor 20 and the other compressor 20 with an oil pipe | tube. .

  Specifically, each of the compressors 20A, 20B1, and 20B2 is a compressor having a high-pressure container in which the inside becomes a high pressure during the compression operation, and as shown in FIG. The oil take-out pipe 60 is provided at a height corresponding to the insufficient oil reference plane. An oil pipe 62 is connected to the oil take-out pipe 60 of the compressor 20B1 via a relay pipe 61 extending upward, and the oil pipe 62 is connected to the refrigerant suction pipe 30A of the compressor 20A via a capillary tube 63. Has been. The oil take-out pipe 60 of the compressor 20A is connected to the refrigerant suction pipe 30B2 of the compressor 20B2 via the relay pipe 61, the oil pipe 62, and the capillary tube 63. Further, the oil take-out port 60 of the compressor 20B2 is The refrigerant pipe is connected to the refrigerant suction pipe 30B1 of the compressor 20B1 through the relay pipe 61, the oil pipe 62, and the capillary tube 63.

  That is, the inside of the high-pressure vessel of one compressor 20 and the suction pipe of another compressor 20 are connected by the oil pipe 61 or the like. For this reason, when the amount of oil in one compressor 20 exceeds the oil reference plane, excess oil exceeding the oil reference plane is supplied into the other compressor 20 via the relay pipe 61 and the oil pipe 62. Thus, the amount of oil in each of the compressors 20A, 20B1, and 20B2 is adjusted substantially evenly.

  FIG. 3 is a longitudinal sectional view showing the internal configuration of the compressor 20. As shown in FIG. 3, the compressor 20 is a scroll compressor. The compressor 20 is a hermetic container 71 as a high-pressure container, a compression mechanism part 72 housed in the hermetic container 71, and drives the compression mechanism part 72. An electric motor unit 73 and the like are housed, and a bottom portion of the sealed container 71 is an oil sump chamber 74. A suction pipe 75 connected to the refrigerant suction pipe 30 (FIG. 1) is formed on the upper surface of the sealed container 71, and a discharge pipe 76 connected to the refrigerant discharge pipe 31 (FIG. 1) is formed on the side surface of the sealed container 71. The discharge pipe 76 extends substantially perpendicularly to the side surface of the sealed container 71 and then extends upward in the sealed container 71. An oil take-out pipe 60 is formed on the side surface of the sealed container 71 located below the suction pipe 75 and the discharge pipe 76. As described above, the oil take-out pipe 60 is provided at a height corresponding to an oil reference surface that becomes insufficient when the oil accumulated in the oil sump chamber 74 is further lowered. After extending vertically, the airtight container 71 extends upward.

  The compression mechanism unit 72 includes a turning scroll 77, a fixed scroll 78, a drive shaft 79 that drives the turning scroll 77 by the electric motor unit 73, a frame 80 to which the fixed scroll 78 is fixed, and the like. The orbiting scroll 77 has an upright spiral wrap 77b on its end plate 77a. A bearing 81 for the drive shaft 79 is provided on the back surface of the end plate 77a. Similarly, the fixed scroll 78 fixed to the frame 80 also has a spiral wrap 78b standing upright on its end plate 78a. In addition, a suction passage 82 that guides refrigerant gas into the wrap is provided in the outer periphery of the wrap, and a discharge passage 83 that guides the compressed refrigerant into the sealed container 71 is provided in the center of the wrap.

  The frame 80 fixed to the sealed container 71 is provided with a bearing 84 that supports the drive shaft 79 and a back pressure chamber 85 for applying an appropriate pressing force to the orbiting scroll 77. The back pressure chamber 85 is configured such that refrigerant having a pressure (intermediate pressure) compressed halfway by the compression mechanism 72 is guided to the back pressure chamber 85. The oil in the oil sump chamber 74 is passed through the oil supply pipe 86 using the differential pressure between the high pressure in the sealed container 71 and the intermediate pressure in the back pressure chamber 85, and the sliding of the bearings 81, 84 and the scrolls 77, 78. Supplying to the moving surface.

  By the way, in this embodiment, since a plurality of (three) compressors 20A, 20B1, and 20B2 are connected by the oil pipe 62, one compressor 20 is stored while the air conditioner 1 is operating. The amount of oil to be increased is biased compared to the other compressors 20, and the oil level height H <b> 1 may be higher than the upper end height H <b> 2 of the oil take-out pipe 60. However, the oil extraction pipe 60 is connected to a relay pipe 61 having a length L whose upper end extends to a position higher than the connection position 87 of the discharge pipe 76 of the high-pressure vessel 71, and the oil pipe 62 is connected to the relay pipe 61. Even if the compressor 20 having the oil level height H1 higher than the upper end height H2 of the oil take-out pipe 60 is removed from the piping system, the connection pipe 61 is connected to the upper end of the relay pipe 61. By disconnecting the oil pipe 62 from the oil pipe, the oil is prevented from flowing out of the compressor 20 and the workability is improved.

Next, connection between the relay pipe 61 and the oil take-out pipe 60 and the oil pipe 62 will be described.
A receiving portion 60 </ b> A is formed at the upper end of the oil take-out pipe 60. The receiving portion 60A is configured such that the inner diameter of the receiving portion 60A and the outer diameter of the lower end of the relay pipe 61 are substantially the same. Then, with the lower end of the relay pipe 61 inserted into the receiving portion 60A of the oil take-out pipe 60 and temporarily fixed, the relay pipe 61 and the oil take-out pipe 60 are connected by, for example, brazing. Similarly, a receiving portion 61A is formed at the upper end of the relay pipe 61, and the receiving portion 61A has an inner diameter of the receiving portion 61A and an outer diameter of the oil pipe 62 that are substantially the same. Then, with the lower end of the oil pipe 62 inserted into the receiving portion 61A of the relay pipe 61 and temporarily fixed, the oil 62 and the relay pipe 61 are connected by, for example, brazing. Thus, since each pipe | tube 61 and 62 can be temporarily fixed by inserting each pipe | tube 61 and 62 in each receiving part 60A and 61A, the brazing operation | work in a narrow space can be performed easily.

  Here, the connection portion A between the receiving portion 60A of the oil take-out pipe 60 and the relay pipe 61 is a place that is never removed once connected by brazing. On the other hand, the connection portion B between the receiving portion 61A of the relay pipe 61 and the oil pipe 62 is a place where the connection is surely removed when the compressor is removed for maintenance or the like. A mark (for example, an arrow) C is provided for notifying the operator. For this reason, at the time of maintenance, the worker does not hesitate which connection part to remove, and can prevent mistakes such as accidentally removing the connection part A.

  According to the present embodiment, when the discharge pipe 76 is provided on the side surface portion of the high-pressure vessel 71 and connected to the oil take-out pipe, the upper end 61 </ b> A is at the height level of the connection portion 87 between the discharge pipe 76 and the high-pressure vessel 71. Since the relay pipe 61 having a length L that reaches it is provided and the oil pipe 62 is connected to the relay pipe 61, the oil level in the oil sump chamber 74 is higher than the height H2 of the upper end of the oil take-out pipe 60. Even when the compressor having a high H1 is removed from the refrigerant piping system, the oil is prevented from flowing out of the compressor 20 by disconnecting the oil pipe 62 from the upper end of the relay pipe 61, Workability is improved.

  Further, even when the height H1 of the oil level in the oil sump chamber 74 reaches the connecting portion 87 of the discharge pipe 76, more oil is supplied to the outside (oil separator) through the discharge pipe 87. As a result, oil does not flow out from the relay pipe 61.

  Further, according to the present embodiment, the upper end of the relay pipe 61 is provided with the receiving portion 61A for inserting the lower end of the oil pipe 62. By inserting the lower end of the oil pipe 62 into the receiving portion 61A, Since the oil pipe 62 can be temporarily fixed, the brazing operation in a narrow space can be easily performed.

  Further, according to the present embodiment, the compressor 20 is a scroll compressor in which the suction pipe 75 is provided on the upper surface of the high-pressure vessel 71 and the discharge pipe 76 is provided on the side surface of the high-pressure vessel 71. Even when the oil level in 20 rises, the oil is discharged from the discharge pipe formed on the side surface, so that the high pressure vessel 71 is prevented from being filled with oil.

  Further, when the brazed connection between the relay pipe 61 and the oil pipe 62 is removed, the connecting portion is heated by the burner, but the distance between the connecting portion and the oil sump chamber 74 is longer than the conventional one. The oil is prevented from being deteriorated by the heat of the burner.

  As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to this. For example, in the present embodiment, when three high-pressure vessel compressors 20 are provided and the high-pressure side of one high-pressure vessel compressor 20 and the low-pressure side of another high-pressure vessel compressor are connected by an oil pipe, the relay pipe However, the present invention is not limited to this, and includes a high-pressure vessel compressor and a low-pressure vessel compressor, and the high-pressure vessel compressor and the low-pressure vessel compressor may be connected by an oil pipe. good. In the present embodiment, the length L of the relay pipe 61 is described as the upper end of the relay pipe 61 extending to a position higher than the connection position 87 of the discharge pipe 76 of the compressor 20. The upper end of the pipe 61 may extend to a height substantially equal to the connection position 87 of the discharge pipe 76 of the compressor 20.

It is a circuit diagram showing one embodiment of an air harmony device concerning the present invention. It is a figure which shows a compressor with the periphery structure. It is a figure which shows the internal structure of a compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus 2A, 2B Outdoor unit 3A, 3B Indoor unit 5 Inter-unit piping 6 High-pressure gas pipe 7 Low-pressure gas pipe 8 Liquid pipe 20, 20A, 20B, 20C Compressor 30, 30A, 30B1, 30B2, Refrigerant suction pipe 60 Oil Outlet 61 Relay pipe 62 Oil pipe 63 Capillary tube 75 Suction pipe 76 Discharge pipe 87 Connection position

Claims (3)

  In an air conditioner having a plurality of compressors including a high-pressure vessel compressor and connecting the plurality of compressors via an oil pipe, the oil discharge pipe of the high-pressure vessel compressor is discharged to the high-pressure vessel compressor. An air pipe characterized in that a relay pipe whose upper end extends is connected to a position substantially equal to the pipe connection position or higher than the connection position of the discharge pipe, and the oil pipe is connected to the upper end of the relay pipe. Harmony device.   The air conditioner according to claim 1, further comprising a receiving portion into which the oil pipe is inserted at an upper end of the relay pipe. The said high pressure container compressor is a scroll compressor by which the suction pipe was provided in the upper surface of the said high pressure container, and the said discharge pipe was provided in the side surface of the said high pressure container, The Claim 1 or 2 characterized by the above-mentioned. Air conditioner.

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