Micro-channel heat exchanger, refrigerator and air-cooled refrigerator

Abstract

The invention discloses a micro-channel heat exchanger, a refrigerator and an air-cooled refrigerator. The micro-channel heat exchanger comprises two collecting pipes, a plurality of heat exchange tubes and fins, wherein the two collecting pipes are arranged in parallel. Two ends of the plurality of heat exchange tubes are connected to the two collecting pipes, respectively, the plurality of heat exchange tubes are bent along the length direction to form a plurality of pipe layers, and the open area of part of the heat exchange tubes are greater than that of the rest heat exchange tubes. Each of the fins is arranged between adjacent two pipe layers or on the outer side of the pipe layer in the outermost layer, each of the fins extends in a corrugated shape in the extension direction of each of the heat exchange tubes, each of the fins extends continuously in the extension direction of each of the collecting pipes, and ventilating holes are formed in each of the fins. The micro-channel heat exchanger disclosed by the invention solves the problems that the water hanging amount on the surfaces of the fins is relatively great and water cannot be thoroughly discharged, and the condition that obstinate ice is generated on the surface of the micro-channel heat exchanger to affect the heat exchange efficiency is avoided. In addition, the defrosting period can be prolonged, the refrigerant flows of the plurality of heat exchange tubes are uniform, and the heat exchange property is enhanced.

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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