Multi-temperature-zone air-cooled refrigerator adopting Stirling cryocooler and temperature control method

Abstract

The invention relates to a multi-temperature-zone air-cooled refrigerator adopting a Stirling cryocooler and a temperature control method. The multi-temperature-zone air-cooled refrigerator comprisesa refrigerator body, a refrigerating portion and a control portion. The temperature control method of the multi-temperature-zone air-cooled refrigerator includes the following initial temperature control steps that firstly, the temperatures in three air compartments of the air-cooled refrigerator are all kept at the environment temperature, the pulse tube type free piston Stirling cryocooler operates at the maximum power, and air compartment air inlet valves and air compartment air return valves in the three air compartments all keep the maximum opening degrees at the moment; secondly, after the first air compartment reaches a first target temperature, the air compartment air inlet valve and the air compartment air return valve in the first air compartment are closed; thirdly, after the second air compartment reaches a second target temperature, the air compartment air inlet valve and the air compartment air return valve in the second air compartment are closed; fourthly, after the third air compartment reaches a third target temperature, the air compartment air inlet valve and the air compartment air return valve in the third air compartment are closed; fifthly, the cryocooler anda cold-side fan stop operating; and sixthly, an electric heating wire is started for defrosting.

Description

technical field [0001] The invention belongs to the field of home appliances, and in particular relates to a multi-temperature zone air-cooled 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] Tr...

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

Images