Pumps – One fluid pumped by contact or entrainment with another – Jet
Patent
1976-07-06
1979-02-20
Croyle, Carlton R.
Pumps
One fluid pumped by contact or entrainment with another
Jet
417154, F04F 900
Patent
active
041404386
ABSTRACT:
A diffusion pump, particularly adapted to pump light gases at a constant rate, includes a flow path for condensate from a cool wall of a body assembly to a region substantially in the center of a liquid pool of vaporizable diffusion pump liquid. Heat to vaporize the liquid in the pool is applied to a peripheral side wall of the pool so that vapor rises from the periphery of the pool to a jet assembly, from which the vapor is emitted through nozzles against the cool wall. The jet and body assemblies are mounted on a shelf above the surface of the pool and are substantially thermally isolated from a heat source for the pool. A fore line includes a plurality of baffle plates that are substantially thermally isolated from the cool wall by a vacuum space. The baffle plates are warm enough to boil away substantially all high vapor pressure materials contacting them, yet cool enough to condense the diffusion pump fluid vapor that contacts them, whereby the condensed vapors in the fore line flow back to the pool.
REFERENCES:
patent: 1330556 (1920-02-01), Shrader
patent: 1791105 (1931-02-01), Seitz
patent: 2386299 (1945-10-01), Downing
patent: 2404021 (1946-07-01), Alexander et al.
patent: 2438387 (1948-03-01), Colaiaco
patent: 2447636 (1948-08-01), Colaiaco et al.
patent: 2709034 (1955-05-01), Lawrance et al.
patent: 3203624 (1965-08-01), Smith, Jr.
patent: 3362623 (1968-01-01), Landfors
Berkowitz Edward H.
Cole Stanley Z.
Croyle Carlton R.
Herbert Leon F.
Look Edward
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