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 collecting pipes, multiple heat exchange pipes and at least one fin; the two collecting pipes are arranged in parallel; two ends of the multiple heat exchange pipes are connected with the two collecting pipes respectively; the multiple heat exchange pipes are bent in length directions of the heat exchange pipes to form multiple pipe layers; and each fin is arranged between the adjacent two pipe layers or is arranged on the outer side of the outmost pipe layer, extends in a corrugated shape in the extending direction of the heat exchange pipes, extends continuously in the extending direction of the collecting pipes and is connected with at least two heat exchange pipes in the pipe layer where the fin is located. According to the microchannel heat exchanger, in the defrosting process, defrosted water on surfaces of the fins can accumulate to form water drops, the water drops can slip off smoothly and can be drained along the continuous fins, problems that the amount of water on the surfaces of the fins is relatively large and the water cannot be drained are solved, and the condition that the heat exchange efficiency is affected due to the fact that stubborn ice is produced on the surface of the microchannel heat exchanger can be prevented.

Description

Technical field [0001] The invention relates to the field of refrigeration and heat dissipation equipment, in particular to a micro-channel heat exchanger, a refrigerator, and an air-cooled refrigerator. Background technique [0002] The engineering development of micro-channel heat transfer technology originated from the demand for high-density electronic device cooling and micro-electronic mechanical system heat transfer. 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. The development of industrialization. [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 an 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 high requirements on the pre...

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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