Microchannel heat exchanger and refrigerator, 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 pipes and fins; the two collecting pipes are arranged in parallel; the two ends of each of the heat exchange pipes are respectively connected with the two collecting pipes; a plurality of heat exchange pipes are bent in the length direction thereof to form a plurality of pipe layers; the lengths of part heat exchange pipes are less than the lengths of the other heat exchange pipes. Each fin is arranged between two adjacent pipe layers or is arranged on the outmost side of the outmost pipe layer; each fin in the extending direction of the heat exchange pipes extends in a corrugated manner; the fins extend continuously in the extending directions of the collecting pipes; ventilation holes are formed in the fins. According to the micro-channel heat exchanger, the problems that a large amount of water is hung on the surfaces of the fins and cannot be drained thoroughly are solved; the influence on heat efficiency caused by obstinate ice on the surface of the micro-channel heat exchanger can be prevented. In addition, the defrosting period can be prolonged; the refrigerant flow rate of the heat exchange pipes can be prompted to be uniform; the 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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