Falling film evaporator with unique gas passage

Abstract

The invention discloses a falling film evaporator with a unique gas passage. The falling film evaporator comprises a housing. The upper portion of the housing is provided with a coolant distributor. Heat exchange tube groups horizontally arranged are arranged below the coolant distributor and include a first path heat exchange tube group and a top heat exchange tube group. A first gas passage is arranged between the first path heat exchange tube group and the top heat exchange tube group. A distance from top heat exchange tubes in the first path heat exchange tube group to bottom heat exchange tubes in the top heat exchange tube group is 75%-100% of the outer diameter of the heat exchange tubes. The tubes in the heat exchange tube groups are reasonably arranged so that the gas passage is formed in the heat exchange tube groups; the gas passage is used to guide gaseous coolant medium so that the gaseous coolant medium escapes from the heat exchange tube groups constantly at reasonable speed, the film type flowing liquid coolant medium is less disturbed by the gaseous coolant medium, and exchange change efficiency of the falling film evaporator can be higher. The falling film evaporator is simple and compact in structure, good in manufacturability and low in cost.

Description

technical field [0001] The invention relates to an evaporator for refrigeration, in particular to a falling film evaporator with a unique gas channel. Background technique [0002] During the working process of the falling film evaporator, the high-temperature condensed liquid delivered from the condenser is throttled and expanded by the throttling device, and then becomes a mixed refrigerant working medium of low-temperature liquid and low-temperature gas, and then the refrigerant working medium enters the falling film evaporator The distribution device in the distribution device, after the distribution device distributes the flow, drips onto the heat exchange tube, and transfers the cooling capacity to the user. After the refrigerant itself is evaporated, it enters the suction port of the compressor, is compressed and then discharged into the condenser. . [0003] Sufficient evaporative heat transfer requires a suitable liquid film to cover the heat exchange tubes, so it ...

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Problems solved by technology

[0003] Sufficient evaporative heat transfer requires a suitable liquid film to cover the heat exchange tubes, so it is necessary to form a film flow in the vertical direction of the heat exchange tubes, and the heat exchange tubes will evaporate the liquid refrigerant into a gaseous refrigerant during the evaporative heat transfer process. During the flow process, the gaseous refrigerant will interfere with the film refrigerant liquid on the heat exchange tubes, that is, a large amount of gas enters the heat exchange tube group. Due to the large gas flow rate, the gas flow rate is high, and the gaseous refrigerant will flow at a high speed. The impact of the liquid film affects the film flow state on the heat exchange tube, and then carries the liquid droplets out of the evaporator without participating in heat exchange, resulting in a decrease in the heat exchange performance of the evaporator

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