Refrigeration cycle apparatus

a technology of refrigerating cycle and compressor, which is applied in the direction of refrigerating machine, lighting and heating apparatus, compression machine, etc., can solve the problems of oil shortage in one compressor, oil imbalance among the compressors, etc., and achieve excellent effects

Inactive Publication Date: 2012-01-26
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]In the present invention mentioned above, the first compressor has the expansion mechanism for recovering power from the refrigerant, in addition to the first compression mechanism for compressing the refrigerant. Therefore, the amount of oil mixed with the refrigerant in the first compressor and discharged to the outside (refrigerant circuit) usually exceeds the amount of oil mixed with the refrigerant in the second compressor and discharged to the outside. In other words, the amount of oil used in the first compressor is greater than the amount of oil used in the second compressor. In such a case, the amount of oil in the first compressor and the amount of oil in the second compressor can be balanced by returning the oil preferentially to the first compressor.
[0011]According to the present invention, the inlet pipe and the first branch outlet pipe form an obtuse angle or an angle of 180° therebetween, and the inlet pipe and the second branch outlet pipe form an acute angle therebetween. With this structure, the liquid phase oil tends to flow to the first branch outlet pipe. That is, the amount of oil returned to the first compressor exceeds the amount of oil returned to the second compressor. As a result, an appropriate amount of oil is always held in each of the first compressor and the second compressor. Particularly in the case where the present invention is applied to a refrigeration cycle apparatus including first and second compressors having different structures, excellent effects are obtained.

Problems solved by technology

In such a refrigeration cycle apparatus, differences in the volumetric capacity and operation control among the compressors may result in an imbalance in the amount of oil among the compressors with the passage of the operation time.
That is, a shortage of oil may occur in one compressor, while an excess of oil may occur in another compressor.

Method used

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modification 1

[0066](Modification 1)

[0067]As shown in FIG. 5, various valves may be provided on the refrigerant circuit 105. Specifically, a valve 61, a valve 62, a valve 63, and a valve 64 are provided in the suction pipe 7, the suction pipe 8, the discharge pipe 19, and the discharge pipe 20, respectively. A valve 65 and a valve 66 are provided in the suction pipe 21 and the discharge pipe 22, respectively, on the expansion mechanism 5 side. A valve 67 is provided in the oil equalizing pipe 50. These valves 61 to 67 can be used to prevent air and moisture from entering the refrigerant circuit 105 when the first compressor 101 or the second compressor 102 is insulated (separated) from the refrigerant circuit 105 for the maintenance, for example. Furthermore, the valves 62 and 64 can be used to insulate (separate) the second compressor 102 from the refrigerant circuit 105 when the refrigeration cycle apparatus 100 is operated using only the first compressor 101.

[0068]The valve 61 is provided in t...

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Abstract

A refrigeration cycle apparatus (100) includes a first compressor (101), a second compressor (102), a radiator (4), an evaporator (6), and a pipe branching portion (30). The first compressor (101) has a first compression mechanism (1) and an expansion mechanism (5). The second compressor (102) has a second compression mechanism (2). The pipe branching portion (30) serves as a flow passage for introducing a refrigerant from the evaporator (6) to the first compression mechanism (1) and the second compression mechanism (2), respectively. The pipe branching portion (30) includes an inlet pipe (31) for receiving the refrigerant from the evaporator (6), a first branch outlet pipe (32) for introducing the refrigerant flowing into the inlet pipe (31) to the first compression mechanism (1), and a second branch outlet pipe (33) for introducing the refrigerant flowing into the inlet pipe (31) to the second compression mechanism (2). The inlet pipe (31) and the first branch outlet pipe (32) form an obtuse angle or an angle of 180° therebetween, and the inlet pipe (31) and the second branch outlet pipe (33) form an acute angle therebetween.

Description

TECHNICAL FIELD[0001]The present invention relates to refrigeration cycle apparatuses.BACKGROUND ART[0002]There has been known a refrigeration cycle apparatus including a plurality of compressors connected in parallel with each other to increase its refrigeration capacity or to respond to changes in refrigeration load. In such a refrigeration cycle apparatus, differences in the volumetric capacity and operation control among the compressors may result in an imbalance in the amount of oil among the compressors with the passage of the operation time. That is, a shortage of oil may occur in one compressor, while an excess of oil may occur in another compressor. Patent Literature 1 discloses a refrigeration cycle apparatus having a pipe arrangement shown in FIG. 7, as a refrigeration cycle apparatus in which measures are taken to prevent the imbalance in the amount of oil.[0003]As shown in FIG. 7, the refrigeration cycle apparatus of Patent Literature 1 includes a first compressor 92, a...

Claims

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Application Information

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IPC IPC(8): F25B1/10
CPCF25B31/002F25B2500/01F25B2400/075
InventorWADA, MASANOBUHASEGAWA, HIROSHIHIKICHI, TAKUMIOYAGI, SHINGOSHIOTANI, YU
OwnerPANASONIC CORP