Trickle falling film type evaporator device and use method

Abstract

The invention relates to a trickle downward film type evaporator device and a using method thereof; the downward film type evaporator of the prior art which is the two-phase refrigerant distributor technology has a five-layer orifice plate structure and a capillary structure, as the structure is more complicated and the processing and assembling difficulty is high, the uneven liquid distribution is easily caused, the heat transfer performance is decreased and the energy efficiency is lowered. The trickle downward film type evaporator device adopts the technical proposal of a multi-directional two-grade pressure decrease distribution device, a two-phase refrigerant distributor which consists of a trapezoidal shell body, a multi-directional flow distribution plate, a grade-one distribution orifice plate, a grade-two distribution orifice plate, a gas absorption distribution plate and an end seal plate is used for carrying out the multi-directional two-grade pressure decrease distribution, thereby leading a gas-liquid refrigerant to be evenly and effectively trickled at the outer surface of the pipe wall of an evaporation pipe bundle and further carry out the full heat exchange. The trickle downward film type evaporator device has the advantages that: the two-phase refrigerant distributor technology has simple structure, easy production, even liquid distribution of the gas-liquid refrigerant and improved heat transfer performance. Compared with the existing flooded evaporator, the energy is saved by 15-20 percent, and the filling amount of the refrigerant is reduced by 20-30 percent, thereby being economic and energy-saving.

Description

technical field [0001] The invention relates to a heat exchange container device in a refrigerating and air-conditioning system, in particular to a dripping falling film heat exchange container device in a refrigerating and air-conditioning system and a usage method. Background technique [0002] The main components in the refrigeration and air conditioning system include: compressors, oil separators, condensers, liquid receivers, expansion valves, evaporators and other pipelines and electronic control equipment. The refrigeration cycle process is that the high-pressure superheated refrigerant and the refrigerated oil gas phase mixture discharged from the compressor pass through the oil separator for gas-liquid two-phase separation, and then the refrigerant enters the condenser and condenses into a high-pressure superheated refrigerant through the normal temperature refrigerant. The cold liquid, after throttling by the expansion valve, is vaporized in the evaporator through ...

AI Technical Summary

Problems solved by technology

However, the dripping falling film evaporator of the prior art still has the following defects: 1) because in the evaporator, the structure of the two-phase refrigerant distributor of the five-layer orifice plate is relatively complicated, the processing and assembly difficulty is high, and it is easy to The liquid separation is uneven, so that the liquid refrigerant drips unevenly along the length and width of the evaporator tube bundle, and the refrigerant liquid film cannot be formed uniformly on the surface of all tube bundles. The gasification process after heat exchange is not sufficient, resulting in the evaporator The liquid refrigerant at the bottom of the cylinder is too much, the oil return is insufficient, and the heat transfer performance is reduced; 2) Due to the unreasonable distribution of suction air, it is easy to cause liquid return, resulting in a decrease in energy efficiency; 3) The existing five-layer orifice plate Two-phase refrigerant distributors with a capillary structure and other forms have complex structures, high sealing requirements, and difficult processing, resulting in high processing costs, uneconomical, and energy-saving

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