Turbine refrigerator

Abstract

The invention provides a turbine refrigerator which can recycle a refrigerant containing a large amount of oil and can prevent the temperature of oil to decrease and the oil from bubbling. The turbine refrigerator is provided with oil recycling ports (L1-L3) located at parts, at different heights, of an evaporator. The turbine refrigerator is also provided with a discharging unit (20) which absorbs the refrigerant, staying in the evaporator (3) and containing oil, through one of the oil recycling ports (L1-L3) and enables the refrigerant to return to an oil cylinder (160 of a turbine compressor (1). The turbine refrigerator is also provided with open and close valves (V1-V3) which are disposed in oil recycling loops (P1-P3), a level sensor which is used for detecting the level of the refrigerant in the evaporator (3), and a control part which operates the open and close valves (V1-V3) so as to enable one oil recycling port exactly under the level of the refrigerant to be communicated with the discharging unit (20).

Description

technical field [0001] The present invention relates to a turbo refrigerator, and more particularly, to a turbo refrigerator in which oil-containing refrigerant remaining in an evaporator is recovered to an oil cylinder by an ejector that uses exhaust gas from a compressor as driving gas. Background technique [0002] Conventionally, turbo refrigerators used in refrigerating and air-conditioning equipment and the like are constituted by a closed system in which a refrigerant is sealed, and are configured as an evaporator that absorbs heat from cold water (fluid to be cooled) to evaporate the refrigerant to exert a cooling effect, A compressor that compresses the refrigerant gas evaporated by the evaporator to become a high-pressure refrigerant gas, a condenser that cools the high-pressure refrigerant gas with cooling water (cooling fluid) to condense it, and The expansion valve (expansion mechanism) that depressurizes the refrigerant and expands it is connected through refri...

AI Technical Summary

Problems solved by technology

[0008] (1) Due to the recovery of a two-phase liquid with a high refrigerant ratio, a sufficient amount of oil recovery cannot be obtained

[0009] (2) Since the low-temperature (approximately 6°C in general air conditioner) refrigerant liquid is mixed into the oil cylinder, the temperature of the oil in the oil cylinder is lowered, and the viscosity of the oil required to supply oil to the rotating body cannot be ensured.

[0010] (3) For the same reason as (2) above, foaming (foaming) occurs in the cylinder and the oil pressure and oil volume for oil supply cannot be ensured

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