HELIUM REFRIGERATOR WITH EXCESS BACK FLOW FOR COLD GENERATION AT TWO TEMPERATURE LEVELS Russian patent published in 2016 - IPC F25B1/00 

FIELD: heating.

SUBSTANCE: satellite refrigerator comprises helium compressor, heat exchange unit, two throttle gates, cryostat of the first cooled device at the temperature of approx. 4.4 K. Claimed refrigerator operates as follows. Backflow helium is compressed in the compressor and force into heat exchange unit straight flow channel to be cooled to the temperature of the second cooled device and, then, divided into two flows. One flow cools the second device and, then, forced back to the extra flow of heat exchange unit communicated via throttle with the first device cryostat. Another flow is also communicated with the first cooled device cryostat via the second throttle.

EFFECT: cooling of the second structure at temperatures above approx 4,4 k with no extra expander, simple and reliable design, enhanced performances.

2 dwg