Novel Stirling air cooling frost-free refrigerator and temperature control method thereof

Abstract

The invention discloses a novel Stirling air cooling frost-free refrigerator and a temperature control method thereof, the novel Stirling air cooling frost-free refrigerator comprises a refrigerator body and a refrigerating unit, and the refrigerating unit is arranged on the upper portion of the refrigerator body; a freezing chamber and a refrigerating chamber are formed in the lower portion of the refrigerator body; the refrigerating unit comprises a linear compressor, two split-type pneumatic Stirling refrigerating machines, air supplying pipelines, two adjusting switches, two cold end heatexchangers and two cool conducting draught fans; the linear compressor communicates with the two pneumatic Stirling refrigerating machines through the two air supplying pipelines, and the two pneumatic Stirling refrigerating machines are used for refrigerating of the freezing chamber and the refrigerating chamber correspondingly; one end of each cold end heat exchanger is connected with a cold head of the corresponding Stirling refrigerating machine, and the other end of each cold end heat exchanger is in a semi-circular fin shape; and the cool conducting draught fans are arranged beside the cold end heat exchangers and used for circulating of cold air, and the two adjusting switches are arranged on the two air supplying pipelines correspondingly and used for adjusting the refrigerating capacity and the refrigerating temperature of the two pneumatic Stirling refrigerating machines, and thus the temperatures of the freezing chamber and the refrigerating chamber are controlled.

Description

technical field [0001] The invention belongs to the refrigeration field, and in particular relates to an air-cooled frost-free refrigerator using a single linear compressor to drive two split Stirling refrigerators and a temperature control method. Background technique [0002] The freezing function of ordinary refrigerators (temperature higher than -18°C) is gradually unable to meet people's freezing requirements for some high-end foods. For example, in order to keep some seafood in a better taste during storage, the storage temperature generally needs to be below -40°C . When meat products are stored in ordinary refrigerators, they should not be refrigerated at 7°C for more than 2 days, refrigerated at 0°C for no more than 5 days, and frozen at -18°C for no more than 1 month. In order to store food 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 ...

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Problems solved by technology

[0005] In order to solve the above-mentioned problem that the cooling efficiency drops significantly due to the failure of the linear compressor and the Stirling refrigerator to achieve the best match, this patent installs a solenoid valve on each of the two air supply branches, and determines the pulse width of the valve by controlling the pulse width. The opening and closing interval makes one valve in the closed state and the other valve in the open state. In other words, the two Stirling refrigerators are in the working state alternately, so as to avoid the situation where the linear compressor drives the two refrigerators at the same time and ensure linearity. The compressor runs at the best working point, which is also the best match for each refrigerator, and the cooling efficiency is high

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