PLANT FOR OBTAINING LOW TEMPERATURES Russian patent published in 1995 - IPC

FIELD: cryogenic engineering. SUBSTANCE: plant has Dewar vessel filled with liquid ⁴He wherein refrigerating unit 3 is submerged. The unit has condenser-evaporator 2 with bath and evacuating pipe 9, evaporation chamber 4, low- temperature heat exchanger 5, and solution chamber 6 connected in series and also two cryogenic sorption pumps 7 and 8 positioned inside the vapor space of Dewar vessel. One of the pumps is arranged on evacuating pipe 9, and other pump is arranged inside the vapor space of the bath of condenser-evaporator 2. Refrigerating unit 3 is mounted inside a vacuum jacket. Pipe coil heat exchangers 10 and 11 are mounted on sides of cryogenic sorption pumps 7 and 8, the inlets of the pumps being connected with the liquid space of Dewar vessel. The vapor spaces of Dewar vessel and bath of condenser- evaporator 2 are connected through valve 16. EFFECT: enhanced efficiency. 1 dwg