Multi-temperature zone refrigerator with pulse-tube free-piston Stirling refrigerator

Abstract

The invention discloses a multi-temperature-area refrigerator adopting a vessel type free piston stirling cryocooler. The multi-temperature-area refrigerator comprises a refrigerator body and a refrigerating system; the refrigerator body comprises a refrigerating chamber, a freezing chamber and a temperature change chamber; the refrigerating chamber is positioned at the upper half part of the refrigerator body; the freezing chamber and the temperature change chamber are positioned at the lower half part of the refrigerator; the refrigerating system consists of a compression throttling refrigerating system and a stirling cryocooler-heat pipe system; the stirling cryocooler-heat pipe system comprises the vessel type free piston stirling cryocooler, a cold end gravity heat pipe, a heat end gravity heat pipe, a cold conducting copper sleeve and a heat conducting copper sleeve; a condensation section pipeline of the heat end gravity heat pipe is upwards arranged on the inner side of the left wall surface of a refrigerator shell; an evaporation section pipeline of the cold end gravity heat pipe is downwards arranged on the back wall surface and the left and right wall surfaces in the temperature change chamber; a condensation section of the cold end gravity heat pipe is connected with a cold head of the vessel type free piston stirling cryocooler through the cold conducting copper sleeve; and an evaporation section of the heat end gravity heat pipe is connected with a heat end of the vessel type free piston stirling cryocooler through the heat conducting copper sleeve.

Description

technical field [0001] The invention belongs to the field of home appliances, and in particular relates to a multi-temperature zone refrigerator adopting a pulse-tube type free-piston 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 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

The sound work recovery problem of the pulse tube refrigerator is solved by setting a short room-temperature expansion piston at the hot end. Therefore, when the sound work at the cold end is fully recovered, the theoretical efficiency of the new pulse-tube free-piston Stirling refrigerator is Carnot cycle efficiency

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