Low-temperature frozen storage tank with primary segregation and separation regenerative mixed refrigerant throttling and refrigerating function

Abstract

A low-temperature frozen storage tank with a primary segregation and separation regenerative mixed refrigerant throttling and refrigerating function comprises a refrigerating system, a control system and a frozen storage tank. A required refrigerating effect is realized by the refrigerating system with a primary segregation and separation regenerative mixed refrigerant throttling function; a high-pressure outlet of a compressor module of the refrigerating system is connected with a refrigerant high-pressure inlet of a regenerative heat exchanger module; a refrigerant high-pressure outlet of the regenerative heat exchanger module is connected with a refrigerant high-pressure inlet of a throttling module; a refrigerant low-pressure outlet of the throttling module is connected with an inlet of an evaporation heat exchange module, an outlet of the evaporation heat exchange module is connected with a refrigerant low-pressure inlet of the regenerative heat exchanger module, and a refrigerant low-pressure outlet of the regenerative heat exchanger module is connected with a low-pressure inlet of the refrigerating compressor module; required regeneration quantity is provided for the inside of a tank body with a heat-insulation layer by the refrigerating system via the evaporation heat exchange module thereof; and the temperature of the inside of the tank body is set as a target value, running parameters and working conditions of the refrigerating system are combined with the target value, and accordingly the control system controls running of the low-temperature frozen storage tank by means of operating the compressor module and the throttling module.

Description

technical field [0001] The invention relates to a low-temperature freezing storage box adopting mechanical refrigeration, in particular to a low-temperature freezing storage box with a throttling refrigeration of a mixed working medium with one-stage separation, condensation, separation, and heat recovery. Background technique [0002] Low-temperature cryopreservation is the most important method to maintain the activity of biological materials. Low-temperature freezer storage boxes have become important basic equipment in the fields of biomedical engineering, agriculture, animal husbandry, and aquatic products. A low-temperature freezer usually refers to a mechanically refrigerated low-temperature freezer with an effective storage temperature below -30°C. It is also commonly known as a low-temperature refrigerator or an ultra-low temperature refrigerator. The mechanical refrigeration cryogenic storage box is an organic combination of refrigeration and low temperature techno...

AI Technical Summary

Problems solved by technology

However, there is a major flaw in the technology of low-temperature frozen storage of mechanical refrigeration below -30°C that is commonly used internationally: there is no unified technology that can completely free, convenient, low-cost and reliable from -30°C to liquid nitrogen The whole temperature zone, and no company has the technology of mechanical refrigeration low-temperature freezer storage box covering the whole temperature zone

The three-stage external cascade throttling refrigeration system was used in the early days to realize the low-temperature freezer storage box at -120°C, but due to the difficulty in achieving both cost and reliability, multi-stage external cascades are rarely used except for two-stage external cascades For cryogenic storage tanks

However, since the core ideas of the refrigeration systems they adopt are all derived from the vapor compression throttling refrigeration in the field of general refrigeration and the multi-stage cascade principle based on it, there are multiple vapor-liquid separations and multiple throttling in the system. Components: First, the complexity of the system significantly increases the difficulty of the design and production process. Second, every time the cooling temperature drops by 30-40°C, it needs to be increased by one level accordingly, so that different temperature zones are not uniform in the refrigeration system. Third, it is difficult to use simple methods. Realize the optimal matching control between all levels, so this refrigeration technology is not very suitable for the realization of low-temperature refrigeration storage boxes in all temperature zones from a technical and economic point of view

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