Simplified apparatus for producing liquid nitrogen

Details Simplified apparatus for producing liquid nitrogen Simplified apparatus for producing liquid nitrogen

1993-01-19

1994-07-12

Capossela, Ronald C.

Refrigeration

Using electrical or magnetic effect

Thermoelectric; e.g., peltier effect

62 471, 62 491, 95 54, F25J 100

Patent

active

053277295

ABSTRACT:
In an apparatus for producing liquid nitrogen by supplying to a nitrogen gas separated from the atmosphere and then purified by an air separating device (4) into an insulated container (1) equipped with an extremely low temperature refrigerator, there are provided a pressure sensor (21) for detecting a pressure within a product vessel (20) of the air separating device (4) and a negative pressure sensor (16) for detecting a negative pressure within the insulated vessel (1) respectively. When at least one of both sensors (21) (16) detects a freezing of an impurity gas contained in the supplied nitrogen gas by reaching a predetermined pressure, an operation of the extremely low temperature refrigerator is stopped depending on the detection by one of both the sensors.

REFERENCES:
patent: 3442091 (1969-05-01), Klipping et al.
patent: 4369636 (1983-01-01), Purcell et al.

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