Pumps – One fluid pumped by contact or entrainment with another – Jet
Patent
1978-03-27
1983-03-15
Look, Edward K.
Pumps
One fluid pumped by contact or entrainment with another
Jet
417407, F04F 900
Patent
active
043766161
ABSTRACT:
An improved vacuum diffusion pump is shown. The pump consists of the conventional elements of a pump body with inlet and outlet ports, a vaporizer, a vapor jet assembly such as a vapor chimney within the pump body and cooling means associated with the outer walls of the pump body. A fan is positioned between the top of the vapor chimney and the inlet port of the diffusion pump. When rotated, the fan drives oil vapors "backstreaming" from the pump body downwardly into and against the walls of the pump body. The fan may be driven by external means but preferably is driven by a turbine positioned in or near the vapor chimney and attached to either an axial shaft supported within the chimney or directly to the fan itself. The turbine is driven by the fast moving oil vapors and in turn drives the shaft or directly rotates the fan. A cap for the chimney may also be fixed to the shaft and rotated therewith, thereby imparting a tangential flow to vapors passing out of the chimney. The invention substantially avoids the problem of "backstreaming" and improves the performance characteristics of the vacuum pump.
REFERENCES:
patent: 1002521 (1911-09-01), Kenney
patent: 1970917 (1934-08-01), Ricker
patent: 3171355 (1965-03-01), Harris
patent: 3182896 (1965-05-01), Bachler
patent: 3353742 (1967-11-01), Bowman et al.
Look Edward K.
Preload Technology, Inc.
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