Refrigeration – Low pressure cold trap process and apparatus
Patent
1978-05-22
1980-01-29
Capossela, Ronald C.
Refrigeration
Low pressure cold trap process and apparatus
55269, 55418, 62268, B01D 500
Patent
active
041854667
ABSTRACT:
A partial pressure condensation pump for increasing the partial pressure of a gas or gases in a gas-vapor mixture, without mechanical pumping, while removing a vapor or vapors from the mixture and while conserving the relative abundances of the gaseous species present. More particularly, the invention comprises a pump which includes a housing providing a flow passage having an inlet and an outlet at the downstream end thereof, a vapor condenser in the flow passage downstream from the inlet, means for suppressing back diffusion of gas toward the inlet, and outflow metering means controlling flow through the outlet for balancing the outgoing gas flow through the outlet and the incoming gas flow through the inlet. In certain embodiments, the suppressing means includes a flow barrier between the inlet and the vapor condenser and having openings therethrough, and, in a presently preferred species of this type, the flow barrier comprises a jet membrane having upstream-facing probes defining the openings therethrough. The suppressing means, in another presently preferred embodiment, may also include locating the vapor condenser a substantial distance downstream from the inlet, adjacent the downstream end of a downstream-convergent portion of the flow passage.
REFERENCES:
patent: 3155310 (1964-11-01), Lorenz
patent: 3164320 (1965-11-01), Welbourn
patent: 3382585 (1968-05-01), Blake et al.
patent: 3455121 (1969-07-01), Beauregard et al.
patent: 4023398 (1977-05-01), French et al.
Capossela Ronald C.
Grumman Aerospace Corporation
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