Refrigerator and method for direct coupling of Stirling cycle and vapor compression refrigeration cycle

Abstract

The invention discloses a Stirling cycle and steam compression refrigeration cycle directly-coupled refrigerating machine and method. The refrigerating machine comprises a Stirling refrigerating machine body and a steam compression refrigerating machine body. The Stirling refrigerating machine body comprises a compression piston, a compression cavity, a condensation evaporator, a heat regenerator, a cold-end heat exchanger, an expansion chamber and a push piston. The steam compression refrigerating machine body comprises a compressor, a condenser, a throttling valve and a condensation evaporator. Cold fluid in the condensation evaporators is a working medium for the steam compression refrigeration cycle, hot fluid is a working medium for the Stirling cycle, and the cold fluid and the hot fluid exchange heat through the wall of the heat exchanger. The working medium for the steam compression refrigeration cycle is used for directly cooling the working medium for the Stirling cycle, compared with a refrigerating medium cooling method, the average temperature of the working medium in the condensation evaporators can be greatly reduced, and the performance of the Stirling cycle is improved. The heat exchange process is simplified, auxiliary power consumption equipment of the condensation evaporators is reduced, and the refrigerating efficiency of the whole system is improved.

Description

technical field

[0001] The invention relates to a regenerative low-temperature refrigerator, in particular to a refrigerator directly coupled with a Stirling cycle and a vapor compression refrigeration cycle and a method thereof.

[0002] technical background

[0003] The application of high-temperature superconducting technology and small cryogenic liquefaction devices has greatly promoted the rapid development of high-power cryogenic refrigerators. The Stirling refrigerator has the characteristics of high efficiency, fast cooling rate, and wide refrigeration temperature range. Its technology is relatively mature and its cost is low. It is the first choice for hundreds and kilowatts of refrigeration equipment.

[0004] The Stirling refrigerator uses the Stirling cycle to obtain cooling capacity. The Stirling cycle is a closed thermodynamic cycle consisting of isothermal compression, isothermal expansion, and two isothermal reheating processes. The compression heat generated...

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