| 摘要 |
1,200,015. Refrigerating. HUGHES AIRCRAFT CO. 13 Sept., 1968 [2 Oct., 1967], No. 43704/68. Heading F4H. Joule-Thomson cooling apparatus comprises an enclosure 12 defining a refrigeration space 50, a tub 18 for supplying refrigerant to the expansion orifice 44, a valve element 42 for throttling the flow of refrigerant through the orifice, and a temperature responsive valveactuating member 30 having one end 32 in heat transfer relation with the ambient environment and its other end 36 in heat transfer relation with space 50. A sleeve 34 screwed on to end 36 carries valve element 42 so that expansion or contraction of member 30 varies the distance between the element and its seat 46. Tube 18 is finned and located between two insulating members 14, 16. Cold expanded refrigerant can flow over tube 18 and through a space 54 surrounding member 30; space 54 communicates with the exterior of enclosure 12, which may be a Dewar flask, through passage 57. The refrigerant may be nitrogen, argon, hydrogen or helium. |
