Mixed refrigerant adapted for refrigerating temperature range of minus 105 degree centigrade to minus 125 degree centigrade

Abstract

The invention provides a mixed refrigerant suitable for the freezing zone at 105 to 125 DEG C below zero. The carbon tetrafluoride (R14) is mixed with one or two of the ethane (R170) and the ethylene (R1150) and then the mixed refrigerant can be obtained after physically mixing. The above components are physically mixed according to a set matching at normal temperature and the corresponding mixedworking substance can be obtained. The ODP is zero, greenly and environment-friendlily, and the mineral lubricating oil of compressor can be well inter-dissolved with the mixed refrigerant. The mixedrefrigerant suitable for the freezing zone at 90 to 100 below zero DEG C can flow the capillary and the expansion valve throttling gear well without oil solidification and wax plugging, and is suitable for the low temperature third grade of three-grade cascade refrigeration system and can form 105 to 125 DEG Cbelow zero low temperature.

Description

technical field [0001] The invention belongs to the field of refrigeration systems and relates to a refrigerant, in particular to a mixed refrigerant suitable for the refrigeration temperature range of -105°C to -125°C. Background technique [0002] In modern refrigeration technology, two-stage cascade refrigeration is used to achieve a low temperature of -70°C to -95°C, but to achieve a cooling temperature in the range of -100°C to -130°C, a three-stage cascade refrigeration method is required. The basic principle of the three-stage cascade is to use a high-temperature stage refrigeration system, and its evaporator is used to cool the condenser of the medium-temperature stage refrigeration system, so that the condensation pressure of the medium-temperature stage can reach a reasonable level (1.0-1.5MPa), so as to obtain a lower cooling temperature. Similarly, the evaporator of the medium-temperature stage is used to cool the condenser of the low-temperature stage refrigera...

AI Technical Summary

Problems solved by technology

[0003] If only carbon tetrafluoride R14 is used in the third low-temperature stage, it will be difficult for the refrigeration system to achieve a normal refrigeration cycle.

The main reason is that R14 does not mix well with compressor oil at low temperature, which leads to the blockage of capillary and expansion valve due to the solidification of compressor oil at low temperature, and the entire refrigeration cycle cannot be realized.

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