Pumps – One fluid pumped by contact or entrainment with another – Jet
Patent
1978-05-18
1980-12-30
Croyle, Carlton R.
Pumps
One fluid pumped by contact or entrainment with another
Jet
F04F 900
Patent
active
042420520
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. In a preferred embodiment the chimney cap is rotatable and is provided on the inner surface of the skirt thereof with turbine blades which are adapted to be driven by the motive fluid vapors as they pass through the effluent port defined by the top of the chimney and the chimney cap. The invention substantially avoids the problem of "backstreaming" and improves the performance characteristics of the vacuum pump.
REFERENCES:
patent: 3182896 (1965-05-01), Bachler
patent: 3353742 (1967-11-01), Bowman et al.
Croyle Carlton R.
Look Edward
Preload Technology, Inc.
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