Low temperature throttling refrigerator with mixed media and switchable gas resources

Abstract

A low-temp throttle refrigerator with switchable gas tank and mixed working medium is composed of refrigerating compressor, switchable gas tank with high-and low-pressure electromagnetic valves, oil-gas separator, and fine oil-gas separator containing fibrous filtering core. Its advantages are high reliability and safety, high oil separating efficiency, and long service life.

Description

technical field [0001] The invention belongs to the field of engineering thermophysics and energy utilization, and relates to a low-temperature throttling refrigerator, in particular to a mixed working medium low-temperature throttling refrigerator with a switchable gas reservoir. Background technique [0002] Before the 1980s, in order to obtain a low-temperature environment with a temperature below -80 °C, a two-stage or even more-stage cascade refrigeration system must be used. The refrigeration system is very complex, time-consuming and power-consuming. also cause environmental pollution. After the 1980s, with the continuous progress of science, experts adopted a new method of uniformly mixing propane, ethane and methane refrigerants and realizing low temperature through refrigeration cycle. This new method gives full play to the unique physical properties of different refrigerants, and can reach a low temperature of -100 °C to -200 °C, which can...

AI Technical Summary

Problems solved by technology

[0002] Before the 1980s, to obtain a low-temperature environment below -80°C, a two-stage or even more-stage cascade refrigeration system must be used. The refrigeration system is very complicated, time-consuming and labor-intensive. Freon refrigerants also cause environmental pollution

[0003] However, there are two biggest defects in this mixed working medium low-temperature throttling refrigerator: one of the defects is that when the refrigeration compressor is started, the discharge pressure and discharge temperature are often too high. It is easy to cause the cylinder block and motor of the refrigeration compressor to burn out, causing serious economic losses

Otherwise, the lubricating oil in the refrigerant will not only directly affect the cooling capacity of the entire refrigeration system, but also if the lubricating oil enters the condensing and liquefaction system of ethane and methane grades, since the freezing point of the lubricating oil is -45°C~ -50°C, while the condensing temperature of ethane and methane is below -50°C, at this time, the remaining lubricating oil in the mixed working medium will first solidify and block the throttle valve pipe, so that the whole mixed working medium will be throttled and refrigerated at low temperature The system will fail critically and be shut down

[0005] Although the existing mixed working medium low-temperature throttling refrigerator has adopted a condensing oil separator, the structure of this condensing oil separator is too complicated, and the condensed oil droplets must rely on gravity to sink to the oil separator At the bottom of the tank, it is collected and returned to the compressor. Once the space position of the low-temperature throttling refrigerator is greatly inclined, the process of oil-gas separation cannot be carried out normally.

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