Inflammable mixture refrigerant being suitable at refrigerating temperature zone of -75 - -105 DEG C

Abstract

The invention relates to an inflammable mixture refrigerant being suitable at refrigerating temperature zone of -75 - -105 DEG C. The refrigerant includes: 1) R601a (isopentane); 2) R236Fa (hexafluoropropane) or R134a or a mixture of the two above; 3) R125 (pentafluoroethane), R32 (difluoromethane), or R507 or a mixture of any two selected above; 4) R23 (trifluoromethane); 5) R14 (carbon tetrafluoride); and 6) R50 (methane), wherein the total molar concentration of the six refrigerants hereinabove is 100%. The inflammable mixture refrigerant being suitable for the refrigerating temperature zone of -75 - -105 DEG C is simple in system and is reliable in performance. The mixture refrigerant is toxic-free, environment-friendly and zero-ODP. All the refrigerants employed are commercially popular, and are convenient to purchase and low in cost, so that the inflammable mixture refrigerant is more convenient to operate and master by maintenance technical operators.

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 -75°C to -105°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 -75°C to -105°C. For example, freeze dryers, Parylene vacuum vapor deposition coating equipment, ultra-low temperature refrigerators and other products. [0003] The basic principle of three-machine cascade compression refrigeration is to use a high-temperature refrigeration cycle system, the evaporator of which is used to cool the condenser of the medium-temperature stage, and the evaporator of the refrigeration cycle system of the medium-temperature stage, w...

AI Technical Summary

Problems solved by technology

[0005] 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 complex, the production and processing technology is very cumbersome, and it is not easy for professional technicians to master; the domestic patent CN101225291A uses a two-stage cascade refrigeration system to achieve a temperature range of -90 degrees to -100 degrees

In the actual application and production process of this patent, there are shortcomings of the traditional cascade refrigeration system such as complex refrigeration system and difficult maintenance; at the same time, the invention uses ethane, ethylene and other types of refrigerants which are completely different from the present invention; domestic patents CN102559146A and domestic patent CN102660229A use refrigerant types different from those of the present invention, and the same temperature ranges are also different; the two patents provide too many types of refrigerants, many of which are not easily purchased on the market, and are even more inconvenient Professionals to master and practical application and operation

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