Refrigeration – Storage of solidified or liquified gas – With measuring
Patent
1992-07-14
1994-01-04
Bennet, Henry A.
Refrigeration
Storage of solidified or liquified gas
With measuring
62491, 62 507, 62 511, F17C 1302
Patent
active
052750078
ABSTRACT:
The sensor assembly includes a sensor tube in communication with the inner tank. A flush line extending from the liquid cryogen fill line is connected to the sensor tube at a three-way valve. The three way valve also connects the sensor tube to a pressure transducer. During normal operation, the sensor tube is in communication with the pressure transducer such that the level of liquid in the dewar can be monitored. When the liquid level falls below a predetermined level, the pressure transducer activates the three-way valve to connect the sensor tube to the flush line and opens a solenoid located in the fill line. As the cryogen liquid enters the fill line, a portion of it is diverted through the flush line, is vaporized and is passed through the sensor tube. The relatively warm gas flow in the sensor tube prevents the formation of ice and eliminates the problems associated therewith. A timer reverses the three-way valve to reconnect the sensor tube to the pressure transducer so that the pressure transducer can close the second solenoid and terminate the fill operation when the predetermined maximum liquid level has been reached.
REFERENCES:
patent: 3442091 (1969-05-01), Klipping et al.
patent: 3938347 (1976-02-01), Riedel et al.
patent: 4135548 (1979-01-01), Sears
patent: 4489569 (1984-12-01), Sitte
patent: 4506512 (1985-03-01), Delacour et al.
patent: 5018358 (1991-05-01), Lee et al.
patent: 5070935 (1991-12-01), Sitte et al.
Bennet Henry A.
Kilner Christopher
Minnesota Valley Engineering, Inc.
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