Fluid sprinkling – spraying – and diffusing – Selectively usable or variable diverse terminal outlets – Outlet formed between parts mounted for relative movement
Patent
1990-10-05
1992-06-30
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Selectively usable or variable diverse terminal outlets
Outlet formed between parts mounted for relative movement
239498, 239505, 239514, 239579, A62C 3103, B05B 112
Patent
active
051255790
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a jet spray nozzle, preferably for fire-fighting, which is adjustable between a position for producing a concentrated jet and a position for producing a scattered jet, by axial displacement of a central control body in relation to an outer sleeve surrounding the central control body which, counting in the direction of flow, has a narrow neck portion merging into a disc-shaped end portion.
The primary object of the invention is to provide a jet spray nozzle of the above-mentioned type which makes it possible, in an efficient manner and with a minimum of flow losses, to produce a thin-layer, yet close curtain of liquid efficiently spread in the transverse direction of the nozzle. In fire-fighting, it may prove highly essential to be able to produce such a water curtain, for instance when the firemen should enter premises which are overheated and/or filled with smoke. The liquid curtain may then be used as a protective shield.
According to the invention, this object is achieved by a jet spray nozzle substantially characterised in that the central control body has a portion gently tapering, preferably conically, in the direction of flow and smoothly merging into the rear side of said disc-shaped end portion, said outer sleeve having a similarly gently tapering internal portion and terminating at some distance behind the rear side of the disc-shaped end portion when said control body is in a position of displacement in which a narrow annular passage is formed between said gently tapering portions of the control body and of the outer sleeve, such that liquid flowing through the nozzle will follow the gently tapering portion of the control body in a thin layer and at a high velocity and be gently deflected outwards into a radial direction while still flowing in a thin layer along the rear side of the disc-shaped end portion of the control body so as to form an extended curtain in front of the jet spray nozzle.
Suitably, the gently tapering portion of the outer sleeve narrows into an inner diameter which is smaller than or equal to the outer diameter of the control body at the point where the gently tapering portion thereof starts, such that the nozzle can be shut off by moving the control body forwards into engagement with the tapering portion of the outer sleeve.
Preferably, the outer sleeve further has a cylindrical mouth portion into which the disc-shaped end portion of the control body can be retracted for producing a concentrated jet.
An embodiment of the invention will be described hereinbelow with reference to the accompanying drawings, in which:
FIG. 1 is a longitudinal section schematically showing a jet spray nozzle according to the invention in shut-off position,
FIG. 2 is a similar longitudinal section of the same jet spray nozzle adjusted for producing a concentrated, forwardly directed jet, and
FIG. 3 is a perspective view partly in longitudinal section of the same nozzle adjusted for producing a jet shield efficiently spread in the transverse direction of the nozzle.
The jet spray nozzle shown in the drawings consists of an inner control body 1 in the form of a sleeve which is closed at the mouth end of the nozzle and the inner cavity 2 of which, adjacent the closed sleeve end portion 3, communicates with the space surrounding the control body, through a number of bores 4 radially distributed along the circumference of the control body. After the bores 4, counting in the direction of flow, i.e. to the right in the drawings, the cylindrical portion 5 of the control body passes in a gently, preferably conically tapering portion 6 which, through a smoothly rounded portion 7, merges into the rear side 8 of a disc-shaped end portion 9 of the central control body 1. The control body is displaceably guided in an outer sleeve 10 which surrounds the control body and in relation to which the central control body is sealed by means of a number of 0-rings 11 mounted in grooves in the central control body. Outside the outlet openings of the radial bores 4, the outer sleeve has a
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Grant William
Kashnikow Andres
LandOfFree
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