Refrigerator adopting single stirling cryocooler as cold source

Abstract

The invention relates to a refrigerator adopting a single stirling cryocooler as a cold source. The refrigerator comprises three temperature zones, namely the freezing zone, the variable temperature zone and the refrigerating zone, wherein the three temperature zones are independent of one another and are sequentially arranged from top to bottom. A cold finger of the stirling cryocooler is separated into two parts, namely a low-temperature cavity and a high-temperature cavity, by a thermally-insulating layer. The thermally-insulating layer is perpendicular to the central axis of the cold finger. The low-temperature cavity communicates with the freezing zone and supplies cold. An air outlet channel of the high-temperature cavity is separated into a first air outlet channel body and a secondair outlet channel body through a split-flow valve. The first air outlet channel body communicates with the variable temperature zone. The second air outlet channel body communicates with the refrigerating zone. The first air outlet channel body is provided with an air door used for controlling the air supply amount input into the variable temperature zone. In this way, the cold finger of the stirling cryocooler can supply cold to the three temperature zones independently at the same time; in addition, by means of the split-flow valve and the air door, the cold capacity can be distributed conveniently and rapidly; and furthermore, temperature control over the variable temperature zone and the refrigerating zone is achieved.

Description

technical field [0001] The invention relates to the technical field of refrigerator manufacturing, in particular to a refrigerator using a single Stirling refrigerator as a cold source. Background technique [0002] Ultra-low temperature refrigerators (lower than -40°C) are widely used in the fields of biological and chemical preparations such as preservation of drugs, vaccines, enzymes, hormones, stem cells, platelets, semen, and gene clone libraries. The conventional design generally adopts dual compressor cascade form. With the improvement of mass production capacity and cost reduction of Stirling refrigerators, using Stirling refrigerators for cooling in ultra-low temperature refrigerators has become a more feasible solution, and realizing multiple temperature zones in the same refrigerator has gradually become a research and development trend. A hot spot for product development. For example, the Chinese invention patent CN 106766540A discloses a multi-stage cold box, ...

AI Technical Summary

Problems solved by technology

In the above scheme, the cold source of the Stirling motor is not fully utilized, the energy utilization rate is low, and it is not convenient to adjust and control the temperature in each chamber

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