Refrigeration – Automatic control – Refrigeration producer
Patent
1978-01-13
1979-12-11
Capossela, Ronald C.
Refrigeration
Automatic control
Refrigeration producer
62514JT, F25B 4104
Patent
active
041776500
ABSTRACT:
Cryogenic cooling apparatus of the type including a generally tubular heat exchanger having a warm end and a cold end and affording two paths through one of which refrigerant gas flows from a supply under pressure to an expansion nozzle for producing cooling by means of the Joule Thomson effect in a liquefying chamber whence the low pressure gas returns through the other path to cool the incoming refrigerant, and a valve member cooperating with the nozzle to vary its effective area for automatically controlling the flow of refrigerant is characterized in that the valve is actuated by the expansion of an expander caused by the temperature of the expander itself, the expander being of elongate form and having an anchored end supported by the cold end of the heat exchanger but thermally insulated from it by a path of low thermal conductivity and extending away from the warm end of the heat exchanger to a free end which actuates the valve the expander having a warm end portion of high thermal conductivity extending from its anchored end to a region between the nozzle and the heat exchanger, which region is not in the direct line of spray from the nozzle, and a cold end portion of lower thermal conductivity extending from the said region to the vicinity of the valve.
REFERENCES:
patent: 3320755 (1967-05-01), Jepsen et al.
patent: 3457730 (1969-07-01), Berry et al.
patent: 3728868 (1973-04-01), Longsworth
patent: 4002039 (1977-01-01), Cramer et al.
patent: 4028907 (1977-06-01), Herrington et al.
Capossela Ronald C.
The Hymatic Engineering Company Limited
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