Refrigeration – Low pressure cold trap process and apparatus
Patent
1975-04-29
1977-03-01
Wayner, William E.
Refrigeration
Low pressure cold trap process and apparatus
55269, B01D 500
Patent
active
040095851
ABSTRACT:
The invention relates to methods of producing a vacuum in a recipient and vacuum pumps for effecting same.
This method consists in the pressure within a recipient being lowered from the atmospheric pressure to an initial vacuum by preliminary evacuation of gases through a solid or liquid gas mass which congeals, when supercooled as a result of removal of its surface vapors, coincidental with the evacuation, the pressure being later brought to a high vacuum level. A baffle is placed in a vacuum pump chamber, dividing this chamber into two spaces, one connected to the recipient and the other to a preliminary evacuation system, wherein the baffle and one of the walls form a clearance, blocked by the liquid or solid gas mass. Such method and vacuum pump ensure production of a sterile oil-free vacuum from 760 mm Hg to 10.sup.-.sup.13 mm Hg and higher.
REFERENCES:
patent: 3144756 (1964-08-01), Arnold et al.
patent: 3188785 (1965-06-01), Butler
patent: 3216207 (1965-11-01), Boyer et al.
patent: 3360949 (1968-01-01), Blanchard et al.
patent: 3379132 (1968-04-01), Wagner
patent: 3536418 (1970-10-01), Breaux
Capossela Ronald C.
Wayner William E.
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