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 header pipes, multiple heat exchange pipes and fins. The two header pipes are arranged in parallel. The two ends of the multiple heat exchange pipes are connected with the two header pipes correspondingly. The multiple heat exchange pipes are bent in the length direction to form multiple pipe layers. The refrigerant circulation resistance of some heat exchange pipes is smaller than that of the rest of the heat exchange pipes. Each fin is arranged between every two adjacent pipe layers or arranged on the outer side of the outermost pipe layer. In the extending direction of the heat exchange pipes, each fin extends in a corrugate shape. In the extending direction of the heater pipes, each fin continuously extends. The fins are provided with air holes. According to the microchannel heat exchanger, the problem that a large amount of water is attached to fin surfaces and cannot be thoroughly drained is solved, and the phenomenon that dense ice is produced on the surface of the microchannel heat exchanger, and therefore heat exchange efficiency is affected can be prevented. In addition, the defrosting period can be prolonged, the refrigerant flow of the multiple heat exchange pipes is promoted to be uniform, and heat exchange performance is improved.

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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