Fluid handling – Processes – Involving pressure control
Reexamination Certificate
1999-10-14
2001-07-03
Chambers, A. Michael (Department: 3753)
Fluid handling
Processes
Involving pressure control
C137S809000, C137S810000, C137S811000, C137S813000, C137S826000, C137S833000, C137S835000
Reexamination Certificate
active
06253782
ABSTRACT:
BACKGROUND AND BRIEF DESCRIPTION OF THE INVENTION
Fluidic oscillators are well known in the art, some using feedback passages with wall attachment effect and without wall attachment effect (see Bray U.S. Pat. No. 4,463,904 for fluidic oscillators which utilize wall attachment and see Stouffer U.S. Pat. No. 4,508,267 for fluidic oscillators which do not depend on or use wall attachment). There are fluidic oscillators which issue an oscillating spray to ambient which do not utilize or incorporate feedback passages (see, for example, Stouffer U.S. Pat. No. 4,151,955 which utilizes an island to generate an oscillating output and Bauer U.S. Pat. No. 4,184,636 which is a reversing chamber type oscillator). In Stouffer et al U.S. Pat. Nos. 5,213,270 and 5,213,269, another type of feedback or control passage free oscillator is disclosed in which an oscillating chamber having a length greater than its width and a pair of mutually facing complementary shaped sidewalls which forms alternately pulsating, cavitation-free vortices on each side of the stream to induce oscillations at the output.
THE PRESENT INVENTION
The present invention is a fluidic oscillator of the type that is free of feedback or control passages and provides a shaped oscillation chamber having at least one outlet and at least a pair of power nozzles adapted to form a pair of liquid jets which are oriented at angles in the chamber to each other such that they interact and generate a plurality of vortices in the chamber. The plurality of vortices cause the pair of liquid jets to cyclically change their directions and combine to produce a sweeping jet of liquid at the outlet. In a preferred embodiment, the oscillating chamber has a dome- or mushroom-shaped surface, a manifold feeding the power nozzles and an outlet to ambient is in a wall opposite the dome- or mushroom-shaped surface.
Operatively, the device is based on the internal instability of two jets of liquid in a cavity. The two jets are properly sized and oriented in an interaction chamber such that the resulting flow pattern give a system of vortices which are inherently unstable and cause the two jets to cyclically change their directions. This provides a sweeping jet at the exit of the chamber. The exit outlet or aperture can be designed to produce either an oscillating sheet for area coverage or a fan type, planar spray. The power nozzles need not be symmetrically oriented relative to the central axis of the oscillation chamber. Moreover, the outlet and outlet throat can be adapted to issue a yawed sweeping jet.
Thus, the object of the invention is to provide an improved fluidic oscillator and more particularly to provide a fluidic oscillator which issues a sweeping jet of fluid or liquid to ambient.
REFERENCES:
patent: 3208462 (1965-09-01), Fox et al.
patent: 3452772 (1969-07-01), Zaloudek
patent: 4151955 (1979-05-01), Stouffer
patent: 4184636 (1980-01-01), Bauer
patent: 4463904 (1984-08-01), Bray, Jr.
patent: 4508267 (1985-04-01), Stouffer
patent: 4854176 (1989-08-01), Okabayashi
patent: 4976155 (1990-12-01), Challandes
patent: 5213269 (1993-05-01), Srinath et al.
patent: 5213270 (1993-05-01), Stouffer et al.
patent: 5396808 (1995-03-01), Huang et al.
patent: 5638867 (1997-06-01), Huang
patent: 1550510 (1970-03-01), None
Bowles Fluidics Corporation
Chambers A. Michael
Zegeer Jim
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