Fluid sprinkling – spraying – and diffusing – Unitary plural outlet means – Arranged in plural groups or rows
Patent
1991-10-22
1993-07-20
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Unitary plural outlet means
Arranged in plural groups or rows
239104, 23953314, 2395871, 239602, B05B 114, B05B 1508
Patent
active
052286258
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a sprinkler head comprising a sprinkler body having an inlet and an outlet, a sprinkler base which is detachably fastened at the sprinkler body and closes the outlet, and a rubber-elastic nozzle plate which contacts a fixed supporting plate of the sprinkler base and comprises a plurality of formed on elastic nozzle projections which engage in corresponding receiving bore holes of the supporting plate, have a greater axial length than the respective receiving bore holes of the supporting plate and whose elastically deformable ends project over the outer surface of the supporting plate also when not acted upon by the pressure of liquid.
In a known sprinkler head (U.S. Pat. No. 2,402,741), in which the nozzle projections, however, do not project over the outer surface of the supporting plate, the dimensioning of the liquid ducts in the nozzle projections which adapts itself automatically and in an elastic manner to the different liquid pressures ensures that the exiting spray remains spread out also at low liquid pressures and the individual streams do not combine, e.g. shortly after exiting the sprinkler head, to form a single coarse spray. As a result of the liquid ducts in the nozzle projections which expand and contract elastically, according to the degree of liquid pressure, a self-cleaning effect is also achieved for the sprinkler head, so that solids are discharged and furring is broken off and rinsed out through the nozzle openings.
However, the self-cleaning action of this known sprinkler head is not sufficient, particularly with hard or very hard tap water, for eliminating the rapidly and massively forming furring or for removing it to the extent that it does not interfere with the spray formation. In addition, the deposits forming immediately outside the nozzle openings of the known sprinkler head are not eliminated or are only eliminated to an insufficient degree by means of the self-cleaning action of the known sprinkler head.
In a known sprinkler head (DE 31 07 808 A1) of the generic type indicated in the beginning a self-cleaning action is likewise achieved for the nozzle projections, which are described in the latter as pipes. For this purpose, it is provided that the nozzle projections are constructed as relatively thin-walled pipes, whose portion situated downstream collapses or folds up and closes the respective spray outlet opening when there is no application of pressure. Accordingly, the through-openings are sealed to a great extent against the atmosphere, so that the water present in the sprinkler head cannot dry up accompanied by the formation of furring. On the other hand, when the sprinkler is in operation the thin-walled pipes are supposed to expand elastically, so that every possible incrustation is flaked off already in the initial stage and washed away with the sprinkler water.
This known sprinkler head may have the desired self-cleaning effect, but the use of thin-walled tubular nozzle projections is disadvantageous for the spray pattern produced by the sprinkler head. Namely, the thin-walled nozzle projections undergo different elastic expansion depending on the water pressure. At low pressures the exiting spray is constricted by means of the thin-walled nozzle projections, while at higher pressures the expansion of the nozzle projections can proceed to the extent that the water spray is no longer adequately guided through the nozzle projections. Therefore, it is obvious that an acceptable spray pattern cannot be achieved with this known sprinkler head in view of water pressures which normally vary within limits as wide as 0.5 to 5 bar.
The object of the invention is to provide an improved sprinkler head in which the nozzle projections do not undergo any deformations impairing the spray pattern at normal water pressures and in which it is nevertheless possible to remove the external furring at the nozzle openings completely or at least to a great extent.
The proposed object is met proceeding from the generic type of sprinkler head indicated in the b
REFERENCES:
patent: 2402741 (1946-06-01), Draviner
patent: 2860920 (1958-11-01), Waller
patent: 3322252 (1967-05-01), Alcantara
patent: 3342419 (1967-09-01), Weese
patent: 3383050 (1968-05-01), Crist et al.
patent: 3402893 (1968-09-01), Hindman
patent: 3979064 (1976-09-01), Nordentoft
Kashnikow Andres
Masco GmbH
Trainor Christopher G.
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