Double refrigerating system for refrigerator

Abstract

The invention relates to a double refrigerating system for a refrigerator, and belongs to the technical field of refrigerators. The refrigerating system comprises a compressor, a condenser, a first freezing evaporator, a cold-storage evaporator and an electric switching valve. The outlet of the condenser is connected with the inlet of the electric switching valve, the outlet of the electric switching valve is connected with the inlets of the cold-storage evaporator and the first freezing evaporator respectively through cold storage capillary tubes and freezing capillary tubes, the outlet of the cold storage evaporator is connected with the inlet of the first freezing evaporator, a second freezing evaporator is arranged inside a freezing room, and a second freezing evaporator is connected between the inlets of the first freezing evaporator and the compressor in series. The first freezing evaporator is a winding tube arranged between an existing refrigerator thermal insulating layer and a freezing room box liner and is evenly wound on the peripheral side wall on the outer side of the freezing room box liner, and the second freezing evaporator is arranged on the inner side of the freezing room box liner and on the upper portion of the side face opposite to the door of the refrigerator. The frosting of the freezing room of the refrigerating system is evenly distributed and frost is easy to remove.

Description

technical field [0001] The invention relates to a refrigeration system for a refrigerator, which belongs to the technical field of refrigerators. Background technique [0002] At present, direct cooling refrigerators on the market usually use two types of refrigeration systems: 1) the refrigeration evaporator and the variable temperature evaporator are connected in parallel, and at the same time, the outlets of the refrigeration evaporator and the variable temperature evaporator are connected to the inlet of the freezing evaporator; 2) the refrigeration evaporator The evaporator, variable temperature evaporator and refrigeration evaporator are connected in parallel. [0003] The applicant found that with the first type of refrigeration system, it is very difficult to achieve the set refrigeration temperature due to the low temperature requirement of the freezer, which needs to reach -18°C. With the second type of refrigeration system, it is not only difficult to achieve the...

AI Technical Summary

Problems solved by technology

During the working process of the refrigerator, the surface of the evaporating coil directly exchanges heat with the air in the freezer room. Although it can quickly reduce the temperature in the freezer room, due to the large temperature difference between the rooms, it is very easy to evaporate on the surface of the inner tank of the freezer room. The surface of the coil is frosted, and the frosted parts are unevenly distributed, so it is not easy to defrost

[0005] At the same time, as far as the applicant knows, the existing freezer refrigeration generally uses a wire-tube evaporator with a built-in evaporator, but the built-in evaporator not only occupies a certain space volume, but is still prone to frost in the compartment and is not easy to defrost.

[0006] Further, the applicant found that due to the rise of hot air in the freezer, the temperature of the upper part of the freezer is relatively high. Therefore, when the freezer is used to cool down the freezer, the temperature distribution in the freezer is not uniform, so the distribution of frosting parts is not uniform. , not easy to defrost

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