Fluid sprinkling – spraying – and diffusing – Rigid fluid confining distributor – Fluidic oscillator
Patent
1995-10-02
1997-01-28
Weldon, Kevin
Fluid sprinkling, spraying, and diffusing
Rigid fluid confining distributor
Fluidic oscillator
239597, B05B 104
Patent
active
055971229
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a flat jet nozzle for a high-pressure cleaning device having an outlet opening and a flow channel with a circular cross section arranged concentrically and upstream of and opening into this outlet opening the flow channel narrowing conically in the direction of flow and merging into a circular-cylindrical section located upstream in front of the outlet opening, the end of this section forming the outlet opening, wherein pocket-like extensions of the flow channel are arranged on diametrally opposite sides of the flow channel in the region where the conical section of the flow channel merges into the circular-cylindrical section, these extensions being arranged and designed symmetrically to one another and having a deflecting surface conducting part of the liquid flowing through the conical section essentially transversely into the cylindrical section.
Flat jet nozzles are used in order to be able to sweep over surfaces to be cleaned in sections with a cleaning jet which is spread fanwise and which is, on the one hand, intended to have a uniform cleaning action as far as possible over the entire width of the jet and, on the other hand, is intended to maintain this cleaning action as far as possible over different distance ranges of the nozzle from the surface to be cleaned. For this purpose, it is necessary for the flat jet to be fanned out as little as possible transversely to the direction of fanning; moreover, the distribution of pressure in the interior of the jet must be designed such that the impact speeds of the liquid are constant as far as possible over the entire cross section.
This can often not be achieved with conventional flat jet nozzles which have slit-shaped or elliptical outlet openings (GB-A-2 157 592; BE-A-554 493)--after "openings". In many cases, the impact pressure of the liquid in the center of the jet is considerably greater than in the peripheral regions; moreover, the jet is often fanned out transversely to the actual fanning direction.
The object of the invention is to design a flat jet nozzle of the generic type such that a flat jet results which achieves cleaning actions which are as uniform as possible over its cross section, whereby this cleaning action is maintained as far as possible over a greater distance range from the surface to be cleaned.
This object is accomplished in accordance with the invention, in a flat jet nozzle of the type described at the outset, in that the the outlet opening has a circular cross section transversely to the direction of flow and that the pocket-like extensions extend essentially over the entire diameter of the circular-cylindrical section.
Surprisingly, it has been found that a flat jet can be generated with the desired characteristics when both the flow channel in the nozzle and the outlet opening have a circular cross section, i.e. when they are not designed according to the idea of the elongate outlet opening but, on the contrary, are designed in the manner customarily used in the production of rotationally symmetrical compact jets. In this respect, the compact jet is converted into a flat jet spread fanwise by the deflecting surfaces which are arranged in the lateral extensions, conduct part of the quantity of liquid from opposite sides transversely into the compact jet and hereby deform the jet and fan it out transversely to the direction of introduction. Despite the use of a rotationally symmetrical flow channel and a rotationally symmetrical outlet opening, a fanning out of the jet results, whereby the jet is compressed in the direction at right angles to its fanning out, i.e. a fanning out transversely to the actual direction of fanning is successfully avoided. The jet is, in practice, compressed between the branch streams entering it from the side and is prevented from fanning out in one direction whereas it is fanned out in a plane extending at right angles thereto.
In this respect, it is important for a flow behavior to be formed in the interior of the nozzle by the conically narrowing section which is par
REFERENCES:
patent: 2701412 (1955-02-01), Wahlin
patent: 2745701 (1956-05-01), Wahlin
patent: 2985386 (1961-05-01), Steiwen
patent: 3659787 (1972-05-01), Ito
Alfred Karcher GmbH & Co.
Lipsitz Barry R.
Weldon Kevin
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