Abstract Cryogenic cooling apparatus includes a generally tubular heat exchanger affording two paths through one of which refrigerant from a supply under pressure is supplied to a pressure reducing nozzle, whereupon the low pressure refrigerant returns through the other path, a valve member co-operating with the nozzle to vary its effective area for automatically controlling the flow of refrigerant, and a bellows, connected to the valve to actuate it. To provide a compact construction without unduly reducing the size of the bellows the valve is situated outside the heat exchanger beyond its cold end and the bellows is outside the heat exchanger beyond its warm end, and is connected to the valve by a piston rod extending through the heat exchanger.
Cryogenic cooling apparatus, comprising; an insulating housing, a heat exchanger mounted within said housing, a cooling chamber formed at an extremity of said housing, pressure regulating means mounted externally to said housing at an extremity thereof opposite said cooling chamber, pressure reducing valve means mounted within said housing for regulating the flow of a refrigerant to said cooling chamber, said heat exchanger including a first path for conveying said refrigerant to said valve means from a supply source and a second path for conveying refrigerant under reduced pressure, and means connectIng said pressure regulating means to said valve means to vary the opening of said valve means for automatically controlling the flow of refrigerant to said cooling chamber in accordance with the pressure within said pressure regulating means.
Claim 2
Dependent Claim
128 words
Cryogenic cooling apparatus, comprising; an insulating housing, a heat exchanger mounted within said housing, a cooling chamber formed at an extremity of said housing, pressure regulating means mounted externally to said housing at an extremity thereof opposite said cooling chamber, pressure reducing valve means mounted within said housing for regulating the flow of a refrigerant to said cooling chamber, said heat exchanger including a first path for conveying said refrigerant to said valve means from a supply source and a second path for conveying refrigerant under reduced pressure, and means connectIng said pressure regulating means to said valve means to vary the opening of said valve means for automatically controlling the flow of refrigerant to said cooling chamber in accordance with the pressure within said pressure regulating means.
Claim 3
Dependent Claim
34 words
Apparatus as in claim 1 wherein said pressure regulating means includes a chamber and a bellows mounted therein, and said connecting means is a mechanical linkage mounted to said bellows and said valve means.