Falling film type screw water chilling unit realizing variable temperature difference through flow varying

Abstract

The invention discloses a falling film type screw water chilling unit which comprises a falling film evaporator, a screw compressor, a condenser, a dryer, an expansion valve, a liquid-liquid injector and a gas-liquid injector. The gas refrigerant outlet of the falling film evaporator is directly connected with the screw compressor through a refrigerant circulating pipeline; the oil outlet of the falling film evaporator is respectively connected with the gas suction pipeline of the screw compressor and the condenser through the gas-liquid injector; the liquid return opening of the falling film evaporator is connected with the liquid-liquid injector; the other two connectors of the liquid-liquid injector are respectively connected with the dryer and the liquid inlet of the evaporator; the dryer is also connected with the condenser; the outlet of the screw compressor is connected with the condenser; and both the falling film evaporator and the condenser are provided with channels for charging and discharging water, and can realize flow varying according to temperature difference. The falling film type screw water chilling unit has the advantages that the heat exchange performance is high, the applicable temperature difference range is wide, the refrigerant charging amount is small, and the oil return performance is good.

Description

technical field [0001] The invention relates to an air conditioner, in particular to a falling-film screw chiller, in particular to a falling-film screw chiller which realizes a variable temperature difference by changing the process flow. Background technique [0002] In order to achieve the goal of saving energy and reducing consumption, the country has announced a series of energy-saving evaluation standards for products, including energy-saving evaluation standards for chillers. At present, more and more companies design and manufacture high-energy-efficiency falling-film chillers, but ordinary falling-film chillers have the disadvantage of narrow applicable temperature range, which does not meet or limit customers' needs for large temperature difference and small flow. Therefore, a new generation of falling film screw chiller has been developed, which realizes variable temperature difference through variable flow, high-efficiency heat exchange and less refrigerant charg...

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Problems solved by technology

[0012] The patent of Guangdong University of Technology (CN201983533U) authorized a gas-liquid separation falling film evaporator, which mainly describes that the distributor includes at least two layers of film distributors with the function of gas-liquid separation, but it has not been involved in the tube sheet and tube bundle.

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