Environment-friendly and freon-free ultralow cold storage

Abstract

The invention discloses environment-friendly and freon-free ultralow cold storage and aims to provide the ultralow cold storage which adopts a three-stage cascade refrigerating system, has high cooling speed and low refrigerating temperature, applies environment-friendly refrigerants and has little loss of refrigeration capacity. The cold storage comprises a body, a cooling water system and a three-stage cascade refrigerating system formed by a high-temperature-level refrigeration cycle system, a medium-temperature-level refrigeration cycle system and a low-temperature-level refrigeration cycle system, wherein the body is made of three-layer polyurethane core panels; an internal door and an external door are installed on the body; equilibrium windows are arranged inside wall panels of the body; and the refrigerants in the high-temperature-level refrigeration cycle system, the medium-temperature-level refrigeration cycle system and the low-temperature-level refrigeration cycle system are respectively R404a, R23 and R14. The cold storage of the invention is large in available space inside, short in cooling time and high in refrigerating coefficient of the system, provides convenient conditions for more experiments and greatly expands the applicability.

Description

technical field [0001] The invention belongs to the field of ultra-low temperature technology, and more specifically relates to an environment-friendly, fluorine-free ultra-low temperature storage. Background technique [0002] At present, in the field of refrigeration technology, according to the design temperature of refrigeration, it can be divided into four categories: high temperature, medium temperature, low temperature and ultra-low temperature. Ultra-low speed freezer is also called ultra-low temperature freezer. It is mainly used for low temperature medical treatment, low temperature storage, cooling of low temperature electronic devices, low temperature liquefaction and purification of gas, infrared system, vacuum freezing and drying, and provision of low temperature environment experimental equipment, etc. The main users include electronics industry, health care industry, colleges and universities and scientific research institutions. At present, there is basica...

AI Technical Summary

Problems solved by technology

At present, there is basically no ultra-low temperature storage in China, and the ultra-low temperature cold storage for domestic demand mainly depends on imports, which are expensive

[0003] At present, most domestic or foreign ultra-low temperature storage refrigeration systems use a two-stage cascade refrigeration system, and the refrigeration temperature can only reach -30°C to -80°C, and the cooling capacity is low and the cooling speed is slow.

At the same time, most of the medium and low temperature refrigerants such as R12, R22, R500, R13, R503 are used to aggravate the earth's greenhouse effect, and the chlorine contained in them will cause damage to the atmospheric ozone layer

The three-stage cascade refrigeration system is in the research stage and has not yet been applied in industry.

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