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    • 3. 发明授权
    • Cryogenic cooling apparatus
    • 低温冷却装置
    • US4373357A
    • 1983-02-15
    • US309830
    • 1981-10-08
    • Norman H. AdamsDavid N. Campbell
    • Norman H. AdamsDavid N. Campbell
    • F17C3/08F25B9/02F25J1/00F25B19/00
    • F25J1/0276F17C3/085F25B9/02F17C2227/0353F17C2227/036F17C2250/0636F17C2270/0509F25B2309/022F25J2290/42
    • Cryogenic cooling apparatus of the type including a generally tubular heat exchanger affording two paths, through one of which, in use, refrigerant gas from a supply under pressure is supplied to a Joule-Thompson expansion nozzle to liquify a portion of the gas in a container where the low pressure gas returns through the other path, and a valve member co-operating with the nozzle to vary its effective area for automatically controlling the flow of the refrigerant. The valve member is actuated via an elongate operating member by a movable wall of a bellows situated within or beyond the heat exchanger and exposed on one side to the pressure of a sensing vapor, which, in operation, is in equilibrium with liquid. The operating member is in the form of a tube whose interior communicates with the space containing the sensing vapor, and extending down to the region of the nozzle so that the heat extracted from the sensing vapor in the operating member is a function of the quantity of liquid refrigerant in contact with the operating member.
    • 这种类型的低温冷却装置包括一个通常管状的热交换器,其提供了两个通路,其中一个通路在使用中被供应到焦耳汤普森膨胀喷嘴,以将一部分气体液化在容器中 其中低压气体通过另一路径返回,以及阀构件与喷嘴协作以改变其有效面积以自动控制制冷剂的流动。 阀构件通过位于热交换器内或超过热交换器的波纹管的可移动壁通过细长的操作构件致动,并且在一侧暴露于在操作中与液体平衡的感测蒸气的压力。 操作构件是管的形式,其内部与容纳感测蒸气的空间连通,并向下延伸到喷嘴的区域,使得从操作构件中的感测蒸气提取的热量是 液体制冷剂与操作构件接触。