Refrigerator having multiple temperature zones

Abstract

The invention relates to a refrigerator having multiple temperature zones. A refrigerating chamber is located at the upper half part of a refrigerator body of the refrigerator; a freezing chamber and a variable temperature chamber are located at the lower half part of the refrigerator; a condensation section pipeline of a hot-end gravity heat pipe is upwards arranged on the inner side of the left wall surface of a casing of the refrigerator; evaporation section pipelines of a cold-end gravity heat pipe are downwards arranged on the back wall surface and left and right wall surfaces inside the variable temperature chamber; a condensation section of the cold-end gravity heat pipe is connected with a cold end of a free-piston Stirling cooler by the aid of a cold conduction copper sleeve; and an evaporation section of the hot-end gravity heat pipe is connected with a hot end of the free-piston Stirling cooler by the aid of a heat conduction copper sleeve. The free-piston Stirling cooler has the characteristics of wide cooling temperature zone, compact structure, high low-temperature cooling efficiency and the like and enables the variable temperature chamber to realize the lowest temperature of subzero 60 DEG C through combination with the advantages of high heat transfer efficiency and simple structure of the gravity heat pipes. According to the novel refrigerator having the multiple temperature zones, different cooling temperatures inside the refrigerator can be accurately controlled through adjustment of the working frequency of a variable frequency compressor and the input voltage of the free-piston Stirling cooler.

Description

technical field [0001] The invention relates to a refrigerator, in particular to a multi-temperature zone refrigerator combined with compression and throttling refrigeration of a Stirling refrigerator. Background technique [0002] With the improvement of people's living standards, the freezing function of ordinary refrigerators (temperature higher than -18°C) is gradually unable to meet people's freezing requirements for some foods, such as some seafood that needs to be preserved better below -40°C. Taking meat as an example, when stored in an ordinary refrigerator, it should not be stored at 7°C for more than 2 days, at 0°C for no more than 5 days, and at -18°C for no more than one month. For foods that need to be stored for a long time, the lower the freezing temperature, the more it can inhibit the growth and reproduction of microorganisms and the activity of enzymes, the smaller the loss of nutrients, and the better the freshness of preservation. [0003] Traditional h...

AI Technical Summary

Problems solved by technology

Therefore, even if the refrigerator is in a stable state, the temperature in the box fluctuates periodically, which is unfavorable for the preservation of some advanced foods such as seafood

Moreover, the single-stage vapor compression throttling refrigeration system is also difficult to achieve a refrigeration temperature below -40°C, which cannot meet the temperature requirements for some food preservation.

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