Oil return circuit and oil return method for refrigerating cycle
A refrigeration cycle and circuit technology, applied in the field of GWP, can solve problems such as compressor oil temperature rise, achieve the effect of suppressing oil temperature rise and solving poor lubrication
Inactive Publication Date: 2018-01-02
MITSUBISHI HEAVY IND THERMAL SYST
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Problems solved by technology
However, compared with the R410A refrigerant, the discharge gas temperature of the R32 refrigerant rises by about 10 to 20°C, and the higher the pressure ratio between the suction pressure and the discharge pressure, the higher the discharge gas temperature tends to be. The oil temperature in the compressor rises due to the return oil from the oil separator
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[0037] Below, use figure 1 and figure 2 One embodiment of the present invention will be described.
[0038] figure 1 shows a refrigerant circuit diagram including an oil return circuit of a refrigeration cycle according to an embodiment of the present invention, figure 2 A longitudinal sectional view of a low-pressure shell type compressor applied to this refrigeration cycle is shown in .
[0039] Here, the refrigeration cycle 1 is filled with R32 refrigerant or a mixed refrigerant rich in R32 (hereinafter, simply referred to as R32 refrigerant) as a refrigerant, and is equipped with a four-way switching valve 4 , and switches the refrigerant cycle. A heat pump cycle capable of cooling or heating in one direction, or a separate cycle for cooling or heat pumping.
[0040] The refrigeration cycle 1 is constituted by a closed-cycle refrigerant circuit through a refrigerant piping 13, a low-pressure shell type compressor 2, and an oil separator 3 provided in a discharge circ...
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The purpose of the present invention is to make it possible to minimize any increase in oil temperature within a compressor and to ensure a permissible operating range and conditions comparable to those for R410A refrigerant, even when a R32 refrigerant having a high discharge gas temperature is used, as well as to minimize any increase in the oil circulation rate and the effects on the refrigerating cycle capacity and performance. The present invention is provided with a refrigerating cycle (1) equipped with a low-pressure housing-type compressor (2) and filled with R32 refrigerant, an oil separator (3) provided to the discharge circuit (13A) of the compressor, and an oil return circuit (31) for returning the oil separated by the oil separator to an oil reservoir inside the housing of thecompressor. The oil return circuit is a parallel circuit comprising a direct circuit (32) for direct return of oil to the oil reservoir in the housing, and a cooling circuit (35) for return of oil having been cooled by an oil cooler (37), and is provided with an oil temperature control unit (42) for detecting at least one parameter among the discharge temperature of the refrigerant, and the oil temperature or oil viscosity within the compressor, and when the parameter exceeds a threshold value, switching the oil return circuit from the direct circuit to the cooling circuit, and returning theoil once the oil temperature is brought to a prescribed temperature or lower.
Description
technical field [0001] The present invention relates to a cycle of a refrigeration cycle using R32 refrigerant with a low global warming coefficient (hereinafter referred to as GWP) or a mixed refrigerant rich in R32 refrigerant (hereinafter referred to as R32 refrigerant for short). Oil circuit and oil return method. Background technique [0002] Regarding R32 refrigerant, its ozone destruction coefficient (ODP) is zero, and compared with R410A refrigerant, its GWP is about 1 / 3, which is low, so it can contribute to reducing environmental load, and can be used as R410A refrigerant alternative refrigerants. However, compared with the R410A refrigerant, the discharge gas temperature of the R32 refrigerant rises by about 10 to 20°C, and the higher the pressure ratio between the suction pressure and the discharge pressure, the higher the discharge gas temperature tends to be. The temperature of the oil in the compressor rises due to the return oil from the oil separator. As ...
Claims
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IPC IPC(8): F25B1/00F25B1/04F25B43/02
CPCF25B1/00F25B1/04F25B43/02F25B31/004F25B2500/16F25B2700/1933F25B2700/2105F25B9/002
Inventor 宫本善彰木全央幸高须洋悟高桥一树
Owner MITSUBISHI HEAVY IND THERMAL SYST