Patent ID: 7000412

Claim:
A constant temperature refrigeration system for extensive temperature range application comprising a refrigerator, a low-temperature heat exchanger, a medium-temperature heat exchanger, a high-temperature heat exchanger, a pump, a first solenoid valve, a second solenoid valve, a third solenoid valve, a first heater, a second heater, an input end and an output end; wherein said input end, said first solenoid valve, said high-temperature heat exchanger, said pump and said output end in turn form a first loop of working fluid between said input end and said output end via conduits; said input end, said second solenoid valve, said medium-temperature heat exchanger, said low-temperature heat exchanger, said high-temperature heat exchanger, said pump and said output end in turn form a second loop of working fluid between said input end and said output end via conduits; and said input end, said third solenoid valve, said low-temperature heat exchanger, said high-temperature heat exchanger, said pump, and said output end in turn form a third loop of working fluid between said input end and said output end via conduits; said refrigerator is connected in tandem with said low-temperature heat exchanger, whereas a medium-temperature cooling source flows through said medium-temperature heat exchanger, with said first heater being disposed on the outlet of the cooling end of said medium-temperature heat exchanger and said second heater being disposed on the inlet of the cooling end of said medium-temperature heat exchanger.