Microchannel heat exchanger, refrigerator and air-cooled refrigerator

Abstract

The invention discloses a microchannel heat exchanger, a refrigerator and an air-cooled refrigerator. The microchannel heat exchanger comprises two headers, a plurality of heat exchange tubes and fins, and the two headers are arranged in parallel. Both ends of each of the heat exchange tubes are respectively connected with the two headers, the heat exchange tubes are bent into a plurality of tube layers along the length direction, and the area of passage of part of the heat exchange tubes is larger than the area of passage of the rest of the heat exchange tubes. Each fin is arranged between two adjacent tube layers or on the outside of the outermost tube layer, each fin extends in a corrugated form along the extension direction of the heat exchange tubes, and each fin continuously extends along the extension direction of the headers. The microchannel heat exchanger according to the invention solves the problem that water cannot be drained out because the amount of the water hung on the surfaces of fins is large, and thereby stubborn ice can be prevented from being produced on the surfaces to affect the efficiency of heat exchange. By differentially designing the areas of passage of the heat exchange tubes, the heat exchange tubes with the large area of passage can be arranged at the first windward part of the heat exchanger, and thereby the flow of refrigerant of the heat exchange tubes becomes uniform.

Description

technical field [0001] The invention relates to the field of refrigeration and heat dissipation equipment, in particular to a microchannel heat exchanger, a refrigerator, and an air-cooled refrigerator. Background technique [0002] The engineering development of micro-channel heat exchange technology stems from the demand for cooling of high-density electronic devices and heat transfer of micro-electromechanical systems. Due to its compact structure and high heat exchange efficiency, micro-channel technology was first obtained in the automotive air-conditioning industry in the domestic market. industrialized development. [0003] The refrigeration system using a new generation of natural refrigerant CO2 is a supercritical cycle, and the system pressure is very high. For example, in the air-conditioning system, the high-pressure working pressure of the system must be above 13MPa, and the design pressure must reach 42.5MPa, which puts forward very high requirements on the pr...

AI Technical Summary

Problems solved by technology

[0004] Common micro-channel evaporators have small fin gaps and small fin lengths. When applied to refrigerators, the frost layer will accumulate too quickly, and the frost layer will easily block the fin gaps, resulting in short defrosting intervals and poor defrosting time. frequently

At the same time, during the defrosting process, due to the short fins, the water on the fins is not easy to accumulate into droplets, which makes it difficult to drain the defrosting water, and finally forms stubborn ice on the surface of the evaporator, which affects the heat exchange effect

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