Low-temperature water cooling system

Abstract

The invention relates to a low-temperature water cooling system which comprises a low-temperature flooded evaporator, a liquid distributor, a liquid storer and at least one set of screw compressor system. Each screw compressor system comprises a plate-type oil cooling heat exchanger, a jet pump, a screw compressor, a first electromagnetic valve and an oil separator. The low-temperature water cooling system is characterized by further comprising an evaporation-type condenser, and a liquid bypass liquid-supply system and two sets of the screw compressor systems are further arranged between the low-temperature flooded evaporator and the liquid storer. The low-temperature water cooling system has the advantages that cooling capacity of the low-temperature water cooling system is improved, operating conditions of the compressors are effectively improved, operating conditions of the whole system are improved, and refrigerating efficiency of the whole refrigerating system is improved.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a low-temperature cold water system. Background technique [0002] At present, in the existing low-temperature cold water system, the evaporator mostly adopts a dry evaporator, and the condenser adopts a water-cooled condenser. The water-cooled condenser needs to be equipped with a cooling tower, a cooling water pump and a cooling water system, and the initial investment is relatively high. This configuration makes the unit run at a lower evaporation temperature and a higher condensation temperature, and the cooling efficiency of the unit is greatly reduced. At the same time, when the compressor is running in this working condition, the exhaust temperature and oil temperature are high, which deteriorates the operating environment of the compressor. For this reason, in the prior art, the refrigerant liquid is sprayed to the compressor to reduce the discharge temperature; th...

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Problems solved by technology

This configuration makes the unit run at a lower evaporating temperature and a higher condensing temperature, and the cooling efficiency of the unit is greatly reduced

At the same time, when the compressor is running in this working condition, the exhaust temperature and oil temperature are high, which deteriorates the operating environment of the compressor.

For this reason, in the prior art, the refrigerant liquid is sprayed to the compressor to reduce the discharge temperature; the refrigerant liquid is injected to cool the temperature of the refrigerated oil, and the refrigerant enters the compressor again. Although this method can effectively reduce the temperature of the compressor The exhaust temperature and the temperature of the refrigerating oil, but the injected refrigerant and the refrigerant that cools the refrigerating oil enter the compressor for compression cycle, which reduces the refrigerant that should have evaporated and refrigerated in the evaporator, reduces the cooling capacity of the unit and increases The power consumption of the compressor reduces the cooling efficiency of the system; in addition, the operating environment of the low-temperature cold water system is different, and because the operating conditions of the system change greatly, it is necessary for the liquid supply system to have a wide adjustment range; and the current low-temperature cold water The system generally uses a single semi-hermetic screw compressor with a small range of cooling capacity

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