Direct swelling liquid supply type low-temperature water cooling unit with multiple shunt-wound screw rods

Abstract

The invention discloses a direct swelling liquid supply type low-temperature water cooling unit with multiple shunt-wound screw rods. The unit comprises a closed cold medium circulating loop and an oil path circulating loop, wherein the closed coolant circulating loop is formed by an exhausting-condensing module, an economizer module, an evaporation module, an air return module; the economizer module is a single economizer single-expansion valve, so that the cost of the unit is low; and the evaporation module is provided with a gas separating tank, and the gas separating tank is used for separating coolant steam after throttling and expansion, so that the liquid at an inlet of an evaporator is uniformly separated, and the effect of the unit is improved. The air return module is provided with a buffer tank, so that the oil return of the unit is guaranteed, meanwhile, the series leakage risk of the unit is reduced, and the operation reliability of the unit is improved.

Description

technical field [0001] The invention belongs to the field of refrigeration equipment, and more specifically relates to the field of a direct-expansion liquid-supply multi-parallel screw low-temperature chiller. Background technique [0002] In recent years, the refrigeration industry has developed rapidly, and the market share of chillers, especially screw chillers, is increasing day by day. In terms of product features, the screw chiller has strong adaptability to projects and can be used in civil, commercial, and industrial applications, and can also be used in combination with other types of chillers. From the perspective of application range, the screw chiller can already be used in high temperature, medium temperature and low temperature multi-working conditions. In the prior art, there are still some deficiencies in low-temperature chillers, especially multi-parallel screw low-temperature chillers with direct expansion liquid supply. [0003] First, the economizer mo...

AI Technical Summary

Problems solved by technology

Existing practice: First, multiple economizers and multiple economizer accessories, that is, the number of economizers is consistent with the number of compressors, resulting in more compressors in the unit connected in parallel, and auxiliary parts such as thermal expansion The number of valves, economizer solenoid valves, etc. increases, which in turn increases the cost of the unit

The second is a single economizer and multiple economizer accessories, that is, the number of economizers is always one. The number of accessories in the economizer accessories such as thermal expansion valves and economizer solenoid valves is determined according to the number of compressors. The air return main pipe is divided into multiple circuits to return to the economizer port of the compressor. The number of economizers is one, but the large number of economizer accessories also increases the cost of the unit

The third is the single economizer and single economizer accessories. When the load of the cold storage decreases, the energy regulation of the compressor starts to unload. Since the load change cannot be reflected in the economizer circuit in time, the superheat of the economizer return air main pipe does not change in time, and the expansion valve does not make adjustments. adjustment, it is easy to cause the compressor to return liquid

After the refrigerant is throttled by the expansion valve, part of the refrigerant vapor will be generated, which will easily lead to uneven liquid separation when entering the dry evaporator, and the heat exchange area of ​​the evaporator cannot be effectively utilized.

[0007] Third, due to the limitation of technical process conditions, the leakage of condensers and evaporators cannot be avoided

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