Refrigerating device for flammable refrigerant

Abstract

The invention relates to a refrigerating device for flammable refrigerant. The refrigerating device comprises a compressor, an outdoor heat exchanger, an expansion mechanism, an indoor heat exchanger and an oil separator. The high-pressure outlet of the compressor is communicated with the inlet of the oil separator. The outlet of the oil separator, the outdoor heat exchanger, the expansion mechanism, the indoor heat exchanger and the low-pressure inlet of the compressor are sequentially communicated. An oil return pipe which is communicated with the internal part of the compressor is arranged on the oil separator. The entire refrigerating system is filled with the flammable refrigerant. The refrigerating system additionally comprises a liquid storage device. The liquid storage device is serially connected between the third port of a four-way valve and the low-pressure inlet of the compressor. The flammable refrigerant can be flammable refrigerant such as R290, R1270, R161 and R152a. The refrigerating device for the flammable refrigerant has the characteristics of simple and reasonable structure, low manufacturing cost, reliable operation, high heat exchange efficiency and wide application scope.

Description

technical field [0001] The invention relates to a refrigeration system, in particular to a refrigeration device for flammable refrigerants. Background technique [0002] R22 refrigerant has been listed as a phase-out refrigerant by the "Montreal Protocol". Europe and Japan have already begun to switch to R410A refrigerant replacement, and the United States will also ban the use of R22 in new refrigeration products in 2010. China has also accelerated the pace of R22 phase-out, which will be frozen at the average level from 2009 to 2010 in 2013, and the requirement of 10% of the baseline level must be reduced in 2015. At present, some major domestic brands have also begun to launch environmentally friendly air conditioners with R410A as the refrigerant. However, the GWP value of R410A is larger than that of R22, and the "Kyoto Protocol" has listed R410A as a greenhouse gas for controlled emissions, so R410A is by no means a long-term alternative. [0003] As an alternative ...

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Problems solved by technology

[0004] However, when this kind of incompatible lubricating oil or partially compatible lubricating oil is used, the lubricating oil will be discharged from the exhaust pipe of the compressor to the outdoor heat exchanger and indoor heat exchange of the air conditioning system along with the compressed refrigerant. The oil film is formed in the pipes of the outdoor heat exchanger and the indoor heat exchanger, which affects the heat exchange efficiency of the outdoor heat exchanger and the indoor heat exchanger and reduces the energy efficiency of the air conditioning system. The lubricating oil is incompatible or partially soluble, and the lubricating oil discharged into the outdoor heat exchanger and the indoor heat exchanger is difficult to return to the compressor with the refrigerant, which will lead to the continuous reduction of the lubricating oil content inside the compressor, making the The lubrication and sealing effect of the compressor is getting worse and worse, which affects the performance and reliability of the compressor, and eventually leads to compressor damage

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