Multi-temperature zone air-cooled refrigerator using Stirling refrigerator and temperature control method

Abstract

According to the multi-temperature zone air-cooled refrigerator and the temperature control method using the Stirling refrigerator of the present invention, the multi-temperature zone air-cooled refrigerator includes a refrigerator box, a refrigeration unit, a control unit, and a temperature control method for the temperature-zone air-cooled refrigerator, Including the following initial temperature control steps: Step 1, the temperatures in the three air chambers of the air-cooled refrigerator all stay at the ambient temperature, and the pulse-tube free-piston Stirling refrigerator operates at maximum power, at this time the air in the three air chambers Both the air chamber inlet valve and the air chamber return air valve maintain the maximum opening; Step 2, when the first air chamber reaches the first target temperature, the air chamber inlet valve and the air chamber return air valve in the first air chamber are closed; Step 3 , when the second air chamber reaches the second target temperature, the air chamber inlet valve and the air chamber return air valve in the second air chamber are closed; step 4, when the third air chamber reaches the third target temperature, the third air chamber The air chamber inlet valve and the air chamber return air valve are closed; step 5, the refrigerator and the cold-end fan stop running; step 6, start the heating wire to defrost.

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

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