Incombustible mixed refrigerant suitable for -50 to -70 DEG C temperature range of refrigeration

Abstract

The invention relates to an incombustible mixed refrigerant suitable for the -50 to -70 DEG C temperature range of refrigeration. A first refrigerant is R245Fa (pentafluoropropane) or R236Fa (hexafluoropropane); a second refrigerant is R125 (pentafluoroethane) or R32 (difluoromethane) or R507; a third refrigerant is R23 (trifluoromethane); and a fourth refrigerant is R14 (carbon tetrafluoride). The total molar concentration of the four refrigerants is 100%. The invention has the following beneficial effects: the incombustible mixed refrigerant suitable for the -50 to -70 DEG C temperature range of refrigeration has a simple system and reliable performance, and is nontoxic, environmentally friendly and incombustible; the refrigerants are all commercially available, are convenient to purchase and are low-cost; and the product is more convenient for maintenance technicians to operate.

Description

technical field [0001] The invention relates to the field of refrigeration systems, in particular to a non-flammable mixed refrigerant suitable for the refrigeration temperature range of -50°C to -70°C. Background technique [0002] With the development of society and the advancement of science and technology, and the rapid development of high-tech fields such as bioengineering, medicine, energy, communications, and military industry, there is an increasing demand for refrigeration products in the temperature range of -50°C to -70°C. The traditional single-stage compression refrigeration system cannot achieve a temperature range of -50 degrees to -70 degrees, and the pressure ratio of the compressor must be less than 12 when the refrigeration system is running. When the ambient temperature is determined, the refrigerant used in the refrigeration system corresponds to the condensing temperature and condensing pressure (exhaust pressure) of the compressor. At the same time, it...

AI Technical Summary

Problems solved by technology

When the refrigeration system operates at a pressure ratio greater than 12, it will cause the exhaust temperature to be too high, the exhaust pressure to be too high, and the compressor temperature to be too high, which will lead to compressor overload, compressor burnout and other faults, which will make the entire refrigeration system fail. run

Usually, to achieve a low temperature of -50 degrees to -70 degrees, a cascade refrigeration cycle refrigeration system must be used. The cascade refrigeration system has disadvantages such as complex refrigeration system, poor reliability, difficult maintenance, high maintenance cost, and serious power consumption.

In prior art such as US Patent Publication No. CN1388887A, the mixed refrigerants in the refrigeration system all use argon (Ar) or nitrogen; The whole system structure of the three phase separators of the heat exchanger is complicated, and the production and processing technology is very cumbersome. At present, there is still a domestic patent CN1460703A. ~-70 degrees) temperature zones intersect

But the type of refrigerant used is completely different; at the same time, there are many problems in the actual application and production process of this patent; the six refrigerant components used in this patent are all flammable refrigerants

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