Self-overlapping refrigeration system

Abstract

The invention relates to a self-overlapping refrigeration system provided with at least one high-temperature self-overlapping loop (1) and at least one low-temperature self-overlapping loop (2), wherein the high-temperature self-overlapping loop (1) and the low-temperature self-overlapping loop (2) are respectively an independent and closed refrigeration circulation loop, and the high-temperatureself-overlapping loop carries out temperature-reduction fractional condensation for the second time to a gas refrigerant of the low-temperature self-overlapping loop after fractional condensation forthe first time by an intermediate heat exchanger. The invention enables the medium temperature of a refrigeration working medium to be lower, reduces the pressure of a low-temperature level system, obviously reduces the exhaust temperature and the exhaust pressure at the previous period of starting-up and temperature reduction, enhances the temperature-reduction speed simultaneously and enables alow-temperature level to obtain much larger refrigerating capacity. The invention enhances the effects of fractional condensation and separation by utilizing the evaporation of a working medium with high boiling point and a mixed regenerative cycle mode of a low-temperature flow-reversal working medium in the low-temperature level, and can ensure that components with high boiling points are more completely separated out.

Description

technical field [0001] The present invention relates to a self-cascading refrigeration system, which has at least one high-temperature self-cascading circuit and at least one low-temperature self-cascading circuit, wherein the high-temperature self-cascading circuit and the low-temperature self-cascading circuit are each an independent, The closed refrigeration cycle circuit, through an intermediate heat exchanger (also called condensation evaporator) high-temperature self-cascading circuit, conducts the second cooling and segregation of the gas refrigerant after the first segregation of the low-temperature self-cascading circuit; wherein, [0002] a. The high temperature self-cascading circuit includes: a high temperature stage compressor, a high temperature stage condenser connected with the high temperature stage compressor, a high temperature stage regenerator connected with the high temperature stage condenser, and the high temperature stage regenerator It is also connect...

AI Technical Summary

Problems solved by technology

Since the high-temperature stage of the system adopts the first-stage condensation and throttling evaporation method, its evaporation temperature can only be in the range of -25°C to -35°C, and the low-temperature stage still needs a medium-temperature refrigerant, which cannot solve the problem of high exhaust pressure when starting up. The problem of high air temperature, moreover, the system also has the disadvantage of slow cooling speed

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