Two-phase distribution dry-type evaporator

Abstract

The invention relates to a two-phase distribution dry-type evaporator and belongs to the technical field of heat exchange. The two-phase distribution dry-type evaporator comprises a plurality of evaporating pipes. Inlets and outlets of the evaporating pipes are not uniform in height position, wherein the inlets are formed in the low positions while the outlets are formed in the high positions. The two-phase distribution dry-type evaporator further comprises a siphon distribution cavity, two-phase refrigerating fluid enters the siphon distribution cavity from an inlet of the siphon distribution cavity, and an outlet of the siphon distribution cavity is communicated with the evaporating pipes in a closed manner. By the adoption of the siphon distribution cavity, the gas-liquid phase refrigerating fluid is evenly distributed, and the problem of low heat exchange efficiency in the prior art is solved.

Description

technical field [0001] The invention relates to a dry evaporator, in particular to a two-phase distributive dry evaporator, which belongs to the technical field of heat exchange. Background technique [0002] As a traditional dry shell-and-tube heat exchanger, dry evaporators account for a large proportion of the market, especially dry evaporators for low-temperature refrigeration and freezing chillers and air-cooled units. The traditional dry evaporator consists of a shell, a cover, a tube box, a tube sheet and multiple evaporating tubes. Chilled water flows between the shell and the evaporating tubes, and the refrigerant flows inside the evaporating tubes. It can not only save the charging amount of refrigerant, but also has good oil return performance. But it also has the following defects: (1) It is difficult for the gas-liquid two-phase refrigerant to be evenly distributed into each evaporator tube; (2) The gaseous refrigerant has the characteristic of naturally gather...

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Problems solved by technology

But it also has the following defects: (1) It is difficult for the gas-liquid two-phase refrigerant to be evenly distributed into each evaporator tube; (2) The gaseous refrigerant has the characteristic of naturally gathering upwards, so the upper part of the distribution chamber is basically a gas (3) At the bottom of the distribution chamber, the liquid refrigerant competes for the limited inlet of the evaporator tube, resulting in a relatively insufficient area of ​​the evaporator tube, resulting in a decrease in heat transfer efficiency, and even part of the refrigerant is not fully evaporated The liquid refrigerant is directly sucked into the compressor, causing the compressor to run with liquid and damage the compressor

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