Non-combustible mixed refrigerant suitable for refrigeration temperature region at temperature of -135 DEG C to -105 DEG C

Abstract

The invention relates to a mixed refrigerant suitable for a refrigeration temperature region at the temperature of -135 DEG C to -105 DEG C. A first refrigerant is R601a (isopentane), a second refrigerant is R245Fa (perfluoropropane), a third refrigerant is R290 (propane), a fourth refrigerant is R23 (trifluoromethane) or R170 (ethane), a fifth refrigerant is R14 (carbon tetrafluoride), and a sixth refrigerant is R740 (argon). The total molar concentration of the six refrigerants is 100%. The non-combustible mixed refrigerant suitable for the refrigeration temperature region at the temperature of -135 DEG C to -105 DEG C has the advantages that the system is simple, performance is reliable, and the mixed refrigerant is nontoxic, environmentally friendly and free of ODP; the refrigerants are all popular refrigerants on the market, purchasing is convenient, and the price is lower; in this way, a maintenance technicist can more conveniently carry out operation and mastering.

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 -105°C to -135°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 -105 degrees to -135 degrees. For example: Parylene vacuum vapor deposition coating equipment, water vapor capture pumps used in vacuum coating machines, ultra-low temperature refrigerators, metal processing low temperature boxes and other products. [0003] Using a traditional refrigeration system, a three-stage cascade refrigeration system must be used to achieve a low temperature of -105 degrees to -135 degrees. There are many shortcomings in its refriger...

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Problems solved by technology

There are many shortcomings in its refrigeration: complex structure of the refrigeration system, poor reliability, difficult maintenance, high maintenance cost, serious power consumption, etc.

[0005] In prior art such as U.S. Patent Publication No. CN1388887A and domestic patent CN102618220A, nitrogen is used in the mixed refrigerant in the refrigeration system; the described mixed refrigerant is completely different from the mixed refrigerant of the present invention; at the same time, the entire refrigeration process of the patent uses four heat The structure of the entire system of the three phase separators of the exchanger is complex, and the production and processing technology is very cumbersome, which is not easy for professional technicians to master

[0006] The domestic patent CN102618220A uses refrigerants R123, R22, etc. that have been banned in the world; this patent has the disadvantages of complex refrigeration system and difficult maintenance in the actual application and production process; the refrigeration principle of this patent is The condensing refrigeration method is different from the present invention; although the domestic patent CN1475544A can also reach the cooling temperature range of -125 degrees, the temperature range mainly used in this patent is different from that of the present invention, and the refrigerant components used in this patent are all flammable Refrigerants; domestic patent CN102660229A uses refrigerant types different from those of the present invention, and realizes different temperature zones; the patent provides too many types of refrigerants, and the market is not convenient to purchase refrigerants; Fully consider the physical characteristics of the freezing point of the refrigerant itself; when using the regenerative refrigeration system, the freezing point of the refrigerant must be lower than the minimum temperature that the refrigeration system must achieve, so as to ensure the safe and long-term trouble-free operation of the system; It is convenient for professionals to master and practical application and operation;

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