Parallel compression refrigeration system

Abstract

The invention relates to a parallel compression refrigeration system. The air vent of every compressor is connected with the first flow path inlet of a plate heat exchanger through an oil-air separator, a condenser and a liquid accumulator sequentially; the first flow path inlet is connected with an evaporator and the second flow path inlet of the plate heat exchanger respectively through a main pipe and an auxiliary pipe; the main pipe is provided with a first throttle device, and the auxiliary pipe is provided with a second throttle device; the evaporator is connected with the air suction ports of a plurality of the compressor; the second flow path outlet of the plate heat exchanger is connected with the middle-stage air suction ports of the plurality of the compressors. After refrigerant passes through the first flow path of the plate heat exchanger, a branching unit branches and transmits the refrigerant into the second flow path of the plate heat exchanger for heat absorption of the first flow path, so that the supercooling degree of the refrigerant flowing in the first flow path in improved; meanwhile, the middle stages of the compressors return air, the refrigerating capacity and the energy efficiency ratio can be effectively improved. Stable operation and long service life are both achieved, and energy saving and environmental protection are obtained.

Description

technical field [0001] The invention relates to a compression condensing unit, in particular to a parallel compression refrigeration system. Background technique [0002] A general refrigeration system is a closed system composed of a compressor, a condenser, a throttling element, an evaporator, etc. The closed system is filled with an appropriate amount of refrigerant. Under the action of the compressor, the refrigerant is compressed by the compressor and then passed through the condenser, The throttling element and the evaporator return to the compressor, and the refrigerant performs heat exchange in the evaporator, realizing the refrigeration process in which the condenser discharges heat and the evaporator absorbs heat. When the evaporator operates at a low evaporating temperature, the compression ratio of the compressor increases, and the gas transmission volume and energy efficiency ratio decrease significantly. At the same time, the discharge temperature of the compre...

AI Technical Summary

Problems solved by technology

When the evaporator operates at a low evaporation temperature, the compression ratio of the compressor increases, and the gas transmission volume and energy efficiency ratio drop significantly. At the same time, the discharge temperature of the compressor is high, which affects the safety of the refrigeration system.

In the existing steam injection technology for increasing enthalpy, the return air of the intermediate stage of the compressor is usually arranged on the side of the compressor. High, affecting normal use, there is a hidden danger of short service life, while the discharge temperature of the remaining compressors is too low, and the compressor has a risk of liquid shock

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