Multi-stage compression refrigeration device

Abstract

The invention discloses a multi-stage compression refrigeration device. The multi-stage compression refrigeration device of the present invention includes: a compression part, which compresses refrigerant at a plurality of compression ends; a condensation part, connected to the compression part, wherein the refrigerant passing through the compression part is condensed through heat exchange; a liquid storage device which is connected to the condensation part and stores a condensed liquid refrigerant in the condensation part; a first expansion valve part which is arranged in the pipe connected to the liquid storage device and expands the refrigerant discharged from the liquid storage device; a gas-liquid separation part, which receives the refrigerant passing through the first expansion valve part and separates the refrigerant into a liquid refrigerant and a gaseous refrigerant, and supplies the gaseous refrigerant to the compression part; a second expansion valve part which is arranged in a pipe connected to the gas-liquid separation part and expands the refrigerant discharged from the gas-liquid separation part; and an evaporating part which is connected to the gas-liquid separation part and the compression part, and converts the liquid refrigerant discharged from the gas-liquid separation part into a gaseous refrigerant through heat exchange. The gas-liquid separation part may be provided downstream of the liquid storage part.

Description

technical field [0001] The invention relates to a multi-stage compression refrigeration device. Background technique [0002] As a general refrigeration device, a refrigerator (Chiller) can be used. A chiller is a large refrigeration system that provides refrigeration to large buildings and uses cold water or antifreeze as a refrigerant to transfer matter as a heat source. [0003] Chillers are devices that deliver cold water to where it is needed. In addition, the chiller conducts heat exchange between refrigerant circulating in the refrigerant cycle and cold water circulating at demand, thereby cooling the cold water. A refrigeration unit using a refrigerator is a large-capacity facility, so it can be installed in a large-scale building, etc. [0004] The cold water cooled by the refrigeration unit using the refrigerator is supplied to the place where the demand is used such as the air conditioner. [0005] The refrigerator unit includes: a compressor for compressing r...

AI Technical Summary

Problems solved by technology

In the case of using only the inlet guide vane to control the refrigeration unit, the reduction in refrigeration efficiency is the least compared with other methods, but since the reduction in refrigeration capacity is not large, there is a problem that it is difficult to maintain a small value of refrigeration capacity. The problem of dealing with the low load operation of the

[0009] When the load control of the refrigeration device cannot be carried out only with the inlet guide vane, the refrigerant in the condenser will be directly transferred to the evaporator through the bypass of high-temperature gas. In this case, there will be a problem that the cooling efficiency will be greatly reduced

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