Low-temperature refrigeration method and system

Abstract

The invention provides a low-temperature refrigeration method and system. According to the method, a refrigerant compression type refrigeration system or other cold sources are used for cooling compressed gas to serve as inlet gas of a vortex tube, low-temperature exhaust gas at the cold end of the vortex tube is used for refrigeration, and the vortex tube and the refrigerant compression type refrigeration system or other cold sources can operate at the same time or operate in sequence. The efficiency of an air compressor is related to the refrigeration efficiency of the vortex tube, the energy consumption of the air compressor is high, especially the efficiency of a small-sized miniature air compressor is lower, and the refrigeration efficiency of the vortex tube is low, so that the efficiency of the air compressor is improved, and the energy consumption of the air compressor is reduced, namely the efficiency of the air compressor is improved by reducing the inlet air temperature of the air compressor, and meanwhile, energy consumption of the air compressor is reduced by reducing the pressure of the air compressor. The low-temperature refrigerating system has the characteristics of high efficiency, high reliability, low energy consumption, low cost and the like, and the low-temperature refrigerating system which is originally limited to special occasions can be applied to common wide fields including various fields of industry, agriculture, commercial use, civil use and the like.

Description

technical field [0001] The invention relates to a low-temperature refrigeration method and system, that is, a low-temperature storage system, in particular to a low-temperature refrigeration method and system and a low-temperature storage system using a refrigerant compression refrigeration system and a vortex tube. Background technique [0002] The current low-temperature refrigeration system mainly adopts compression refrigeration, and scroll refrigeration is mainly used for process refrigeration of cold guns. Ordinary low-temperature compression refrigeration systems, such as refrigerators and refrigeration systems used in cold storage, generally provide a temperature above -45°C, and many occasions, including biomedicine, scientific experiments, military and other fields, require lower temperature refrigeration systems. Some vaccines need to be stored at -70°C or even lower. At the same time, there are many new uses in the industrial civil and commercial fields, such as...

AI Technical Summary

Problems solved by technology

[0005] 1) The system is complex, the failure rate is high, and the reliability is poor;

[0006] 2) Special low-temperature compressors and refrigerants are required, which are difficult to manufacture, difficult to repair and maintain, and require specially trained professionals;

[0008] 4) The refrigeration efficiency is low. Take the -70℃ refrigerator as an example, the refrigeration COP is only 5%, and as the temperature drops, the refrigeration efficiency drops sharply;

[0009] 5) The start-up and recovery time is long, that is, it takes a long time to drop from normal temperature to low temperature, and it takes a long time to recover the temperature after opening the door

[0010] 6) Frost is easy to produce in the refrigerator, which needs to be cleaned regularly, resulting in frequent opening

[0011] 7) Large size and heavy weight

[0014] 1) Stirling belongs to low-temperature refrigeration equipment, and its technical threshold is high;

[0015] 2) Special Stirling refrigerants and gas refrigerants are required, which are difficult to manufacture, difficult to repair and maintain, and require specially trained professionals;

[0016] 3) Helium is used as the refrigerant, and helium is a very rare gas, its resources are limited, it is difficult to obtain in large quantities, and it cannot meet the needs of widespread use

[0017] 4) The cooling efficiency is called cascading high, but it is still very low. Taking a -70°C refrigerator as an example, the cooling COP is about 7-10%, and as the temperature drops, the cooling efficiency drops sharply;

[0018] 5) The start-up and recovery time is long, that is, it takes a long time to drop from normal temperature to low temperature, and it takes a long time to recover the temperature after opening the door

[0019] 6) Frost is easy to produce in the refrigerator, which needs to be cleaned regularly, resulting in frequent opening

[0020] 7) Large size and heavy weight

[0021] 8) The production cost is high and the price is expensive, ranging from tens of thousands to hundreds of thousands of RMB

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