Heat exchanger and air conditioning unit

Abstract

The invention provides a heat exchanger and an air conditioning unit. The heat exchanger comprises a shell, liquid homogenizing structures and an air return pipe, the air return pipe is arranged in the shell, one end of the air return pipe is communicated with an exhaust port, the other end of the air return pipe is communicated with the interior of the shell, and the periphery of the air return pipe is sleeved with the liquid homogenizing structures. According to the heat exchanger and the air conditioning unit, the multiple liquid homogenizing structures and multiple heat exchange mechanisms are arranged, coil pipe structures are adopted, the length of heat exchange pipes is effectively increased, and therefore the falling film evaporation effect is improved, and the gravity potential difference is greatly increased through the vertical shell. Meanwhile, air return channels are arranged in the middles of the heat exchange mechanisms, so that the heat exchanger is compact in structure, liquid blocking pipes can effectively prevent liquid drops from flowing, the problem of air suction with liquid of the heat exchanger is further avoided, and the falling film heat exchange effect of the heat exchanger is effectively improved.

Description

technical field [0001] The invention relates to the technical field of heat exchange equipment, in particular to a heat exchanger and an air conditioning unit. Background technique [0002] In the field of refrigeration, common mainstream shell and tube evaporators mainly include flooded evaporators, dry evaporators, and falling film evaporators. Among them, the falling film evaporator, as a new type of high-efficiency energy-saving equipment, is gradually replacing the flooded evaporator with its advantages of small refrigerant charge, small hydrostatic pressure difference, high heat transfer efficiency and convenient oil return. Different from the flooded evaporator, in order to ensure the heat transfer efficiency of the falling film evaporator, it is necessary to spread the liquid refrigerant evenly outside the heat exchange tube through liquid distributors, liquid equalizing plates and other devices. However, since the falling path of the liquid droplets is opposite to ...

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Problems solved by technology

[0003] In order to solve the technical problem of unreliable falling film heat exchange in the prior art horizontal falling film heat exchanger, a heat exchanger and air conditioning unit with good liquid distribution effect and high heat exchange efficiency are provided

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