METHOD AND DEVICE FOR COLD OBTAINING Russian patent published in 2004 - IPC

FIELD: compression machines, plants or systems.

SUBSTANCE: method involves compressing gas flow in compressor, cooling gas flow up to ambient temperature and feeding thereof in regenerative heat exchanger to transfer heat from gas flow to return working medium flow; feeding part of working medium in the second regenerative heat exchanger to transfer heat from this portion to return working medium flow circulating in the third regenerative heat exchanger and to return flow thereof expanded and cooled in expander; reducing working medium temperature in the third heat exchanger up to throttle valve inlet temperature with transferring heat to return line of the third regenerative heat exchanger; throttling working medium which results in conversion thereof into gas-and-liquid mixture and transferring this mixture to separator; feeding gas fraction from separator to return line of the third heat exchanger and removing liquid fraction from separator; compensating lack of working medium by supplying another portion of working medium at ambient temperature to cooling loop; repeatedly expanding working medium in expanders to obtain gas-and-liquid mixture in separator, wherein the last expansion step is carried out simultaneously with throttling process before separator; increasing pressure of liquid fraction obtained in separator by means of compressor up to compressor pressure and feeding thereof to cooling chamber evaporator and then to pipeline arranged downstream compressor. Device for above method implementation comprises Stirling machine. Expander step of Stirling machine includes several sections made as a number of hollow through plungers with decreasing diameters. Plungers are connected with contact regenerative heat exchangers. The last expansion cavity is provided with suction valve arranged parallel to throttle and with pressure valve.

EFFECT: reduced energy inputs for cold and heat obtaining.

12 cl, 2 dwg