Heat exchanger

Abstract

The invention relates to a heat exchanger comprising an inlet collecting pipe, an outlet collecting pipe and a plurality of heat radiation pipes. After extending into the inlet collecting pipe and the outlet collecting pipe, two ends of each heat radiation pipe are sealed and fixed. The air flows past the outer surfaces of the heat radiation pipes from one direction and undergoes heat exchange with refrigerant in the micro channels of the heat radiation pipes. The lengths of the heat radiation pipes extending into the inlet collecting pipe at the side close to the air inlet direction and at the side close to the air outlet direction are different. The liquid refrigerant proportion in the refrigerant entering the micro channels of the heat radiation pipes at the side close to the air inlet direction is higher than that in the refrigerant entering the micro channels of the heat radiation pipes at the side close to the air outlet direction. By means of reasonably designing end structures of the heat exchange pipes, when the heat exchanger is in the evaporation condition, the refrigerant in different statuses entering the micro channels of the heat radiation pipes can be reasonably distributed so that the energy carried by the refrigerant can be well utilized and all the micro channels in the heat radiation pipes can achieve relatively balanced heat exchange.

Description

technical field [0001] The present invention relates to the technical field of heat exchangers, in particular to a heat exchanger used as an evaporator in refrigeration systems such as air conditioners and freezers Background technique [0002] Heat exchangers are devices that realize heat transfer between cold and hot fluids, and are widely used in HVAC and other fields. [0003] figure 1 It is a schematic structural diagram of a typical heat exchanger in the prior art. The heat exchanger 1 includes an inlet header 11 and an outlet header 12 that are parallel to each other, and the two can usually be arranged in parallel, and there are a plurality of radiating pipes 13 arranged substantially in parallel between them; The cross section is mostly flat, and the channels of the heat dissipation pipe 13 are usually divided into several, and the channels are also called microchannels. The pipe walls corresponding to the inlet header 11 and the outlet header 12 are each provide...

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Problems solved by technology

And because the several passages of the above-mentioned radiating pipe 13 enter the refrigerant in the same state, and the refrigerant in the same state can only reach the same outlet state if it absorbs the same heat; On the right, the lower the outlet temperature of the refrigerant, the worse the heat exchange effect, and even the heat exchange of some microchannels is insufficient, that is, the refrigerant at the outlet of the microchannel is still in a gas-liquid two-phase state or the outlet superheat is insufficient, so that the heat exchange The overall heat transfer efficiency of the device is reduced

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