| 摘要 |
An overlapping type freezing-force circulation refrigeration unit. A liquid-state refrigerant (2) output from a refrigerant storage tank (1) is pressurized by using a liquid-state circulation pump (3), and then the liquid-state refrigerant (2) enters, after being heated by a cooler (4), a cold application unit (8) to provide a cold flow and becomes a gaseous refrigerant. Then, the pressure and temperature of the refrigerant are lowered after an expansion machine (6) acts in an expansion manner, and the refrigerant is returned to the refrigerant storage tank (1) through the cooler (4), a second cooler (4−1), and a throttle valve (9). The liquid-state refrigerant (2) output from the refrigerant storage tank (1) is pressurized by using a second liquid-state circulation pump (3−1), and then returned to the refrigerant storage tank (1) through the second cooler (4−1). The refrigeration unit does not need a circulating cooling water system in a traditional vapor compression type refrigeration unit, maintenance and operation costs are lowered greatly, the energy saving efficiency is high, and equipment is more compact. |
