FLUID SPRAY HEAD AND METHOD ADAPTED TO SPRAY SPECIFIC PATTERN

摘要

FLUID SPRAY HEAD AND METHOD ADAPTED TO SPRAY SPECIFIC PATTERN In a sprinkler apparatus, an improved fluid spray head having the ability to adjust the flow rate of fluid to the discharge orifices, to adjust the precipitation rate over the ground area sprayed, and to spray a specifically shaped non-circular ares. The improved fluid spray head has a plurality of circumferentiallyspaced discharge orifices having cross-sectional areas which progressively vary in a manner such that the relative cross-sectional areas of the discharge orifices are proportional to the square of the distance that their respective spray streams are desired to travel so that the perimeter of the ground area sprayed defines a preselected shape, and so that the ground area sprayed receives a substantially uniform coverage of fluid. The spray head also includes a means for simultaneously increasing or decreasing the size of all the discharge orifices so as to decrease or increase, respectively, the size of the area sprayed at a constant fluid flow rate, and thereby increase or decrease, respectively the precipitation rate over the area sprayed. The spray head also includes a construction so that the rate of fluid flow to the discharge orifices can be adjusted by rotating the top of the spray head, and thereby also adjust the fluid pressure at the discharge orifice. In a preferred embodiment, the spray head includes an inner tubular member which telescopes within an outer tubular member to provide the simultaneous adjustment of the size of the discharge orifices and wherein the inner tubular member is made radially thinner so as to be more pressure expandable under fluid pressure to thereby tighten the fluid seal between the inner tubular member and the outer tubular member. A method for constructing a fluid spray head adapted for spraying a specific pattern or shaped area wherein the fluid spray head has a plurality of circumferentially-spaced discharge orifices including the steps of dividing said pattern into a plurality of sectors radiating from the desired location of the spray head so that each sector corresponds to one orifice, determining the distance that the spray stream from each discharge orifice must travel to cover its respective sector, and sizing each orifice so that its cross-sectional area is proportional to the square of the determined distance that its spray stream is desired to travel.