초록 ▼

A Stirling-cycle refrigerator has a three-pump configuration and pumping sequence, in which one pump serves as a compressor, one pump serves as an expander, and one pump serves as a displacer. The pumps are ferroelectrically actuated diaphragm pumps which are coordinated by synchronizing the ferroel

A Stirling-cycle refrigerator has a three-pump configuration and pumping sequence, in which one pump serves as a compressor, one pump serves as an expander, and one pump serves as a displacer. The pumps are ferroelectrically actuated diaphragm pumps which are coordinated by synchronizing the ferroelectric-actuator voltages in such a way that the net effect of the displacer is to reduce the deleterious effect of dead space; that is, to circulate a greater fraction of the working fluid through the heat exchangers than would be possible by use of the compressor and expander alone. In addition, the displacer can be controlled separately to make the flow of working fluid in the heat exchangers turbulent (to increase the rate of transfer of heat at the cost of greater resistance to flow) or laminar (to decrease the resistance to flow at the cost of a lower heat-transfer rate).

대표청구항 ▼

[ What is claimed is:] [1.] A Stirling-cycle refrigerator, comprising:an enclosed working volume;a predetermined mass of noncondensable gas within said working volume;a compressor pump which compresses said gas throughout said enclosed working volume;an expander pump which expands said gas throughou

[ What is claimed is:] [1.] A Stirling-cycle refrigerator, comprising:an enclosed working volume;a predetermined mass of noncondensable gas within said working volume;a compressor pump which compresses said gas throughout said enclosed working volume;an expander pump which expands said gas throughout said enclosed working volume;a heat exchanger means in fluid communication between said compressor pump;a displacer pump in fluid communication with said heat exchanger means;electrical control means for controlling said compressor pump and said expander pump such that said gas is cyclically compressed and expanded throughout said working volume, and for controlling said displacer pump to prevent dead space within said enclosed volume, modify said displacer pump output wave shape as a function of time, and adjust between laminar and turbulent flow through said heat exchanger means.