Air conditioning unit provided with flooded shell-tube heat exchanger

Abstract

The invention provides an air conditioning unit provided with a flooded shell-tube heat exchanger. The air conditioning unit comprises a compressor, a first heat exchanger communicated with an outflow end of the compressor, the flooded shell-tube heat exchanger, a throttling element connected between the first heat exchanger and the flooded shell-tube heat exchanger, an air-liquid separator and a two-way heat exchanger, wherein a first end of the tube pass of the flooded shell-tube heat exchanger is connected with a first end of the first heat exchanger, and a second end of the tube pass of the flooded shell-tube heat exchanger is connected with an inflow end of the compressor; the air-liquid separator is at least connected between the second end of the tube pass of the flooded shell-tube heat exchanger and the inflow end of the compressor; the first end of the first heat exchanger and the second end of the tube pass of the flooded shell-tube heat exchanger are connected with a first heat exchange pipeline of the two-way heat exchanger, one end of a second heat exchange pipeline of the two-way heat exchanger is connected with an auxiliary road end of a communication liquid phase of the air-liquid separator, and the other end of the second heat exchange pipeline is communicated with a middle air supplementing port of the compressor. Cached refrigerant liquid in the air-liquid separator can be reduced, and liquid impact accidents caused by the fact that the compressor inhales a lot of refrigerant liquid are prevented.

Description

technical field [0001] The invention relates to the technical field of heat pump systems, in particular to an air conditioning unit with a flooded shell-and-tube heat exchanger. Background technique [0002] The evaporator of an air conditioning unit usually includes a flooded shell and tube heat exchanger and a dry shell and tube heat exchanger. [0003] Compared with the dry shell and tube heat exchanger, the flooded shell and tube heat exchanger has a much larger refrigerant charge. Because of the large amount of refrigerant charge, the heat transfer between water and refrigerant approaches a small temperature difference, and the heat transfer efficiency is relatively high, which has a significant advantage in improving performance. However, due to the large amount of refrigerant filling in the flooded shell and tube, and the liquid refrigerant in the heat exchanger, the refrigerant filling volume of the entire air conditioning system is much larger than that of the dry ...

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the refrigerant buffered in the gas-liquid separator of the air-conditioning unit with the flooded shell-and-tube heat exchanger in the prior art, which not only cannot be fully utilized and causes energy waste, but also Excessive buffer capacity causes the compressor to suck in a large amount of refrigerant liquid, resulting in liquid shock damage to the compressor, thereby providing a way to make full use of the refrigerant buffered in the gas-liquid separator to reduce energy waste, while avoiding compressor suction caused by excessive buffer capacity Air conditioning units with flooded shell and tube heat exchangers with flooded shell and tube heat exchangers due to flooding of refrigerant liquid resulting in liquid hammer damage to the compressor

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