Fluidic scanner nozzle and spray unit employing same
A fluidic nozzle of the scanner type has its outlet spray pattern skewed from its chamber axis (A) by an amount determined by the asymmetry of its outlet orifice ( 23, 33 ) about that axis. A spray assembly ( 70, 90 ) of such nozzles, such as a showerhead, can be designed using nozzles with selected pattern skew angles to achieve desired spray coverage. Indexing tabs ( 97 ) and slots ( 96 ) are used to angularly position the nozzles in the showerhead. A portion of each nozzle may be formed with the showerhead faceplate ( 71 ) as an integral piece.
1. A fluidic scanner nozzle comprising:
an interaction chamber defined longitudinally between an upstream end and a downstream end and having a longitudinal chamber axis (A), first and second members secured and sealed together to define said interaction chamber therebetween, said first member including said upstream end and a first open end longitudinally opposite an inlet opening, said second member including said downstream wall and a second open end longitudinally opposite an outlet orifice, and wherein said first and second members are joined at said first and second open ends;
said upstream end including a hemispherical downward facing surface having said inlet opening for receiving pressurized fluid and delivering the pressurized liquid as a jet into said chamber along said chamber axis;
said downstream end including a hemispherical upward facing surface having said outlet orifice for issuing a substantially conical outlet spray of liquid droplets from said chamber into ambient environment;
wherein said outlet orifice is asymmetric relative to said chamber axis to thereby skew the direction of the liquid outlet spray relative to the chamber axis;
wherein the interaction chamber is configured to deflect said jet in three dimensions relative to said longitudinal chamber axis such that the jet, upon issuing from said outlet orifice, forms said spray pattern in a substantially conical configuration of liquid droplets about a spray axis; and
wherein the nozzle is disposed in a first bore defined through a plate of a sprayer along with a plurality of said nozzles disposed in respective additional bores defined through the plate, wherein said first or second member includes an angular positioning tab projecting radially outward therefrom at a predetermined angular location about the chamber axis, and wherein said plate has at least one indexing slot defined longitudinally at the periphery of said first bore and arranged to receive and rotationally engage said positioning tab with said nozzle in an angular position determined by the angular location of said indexing slot.
2. The scanner nozzle of claim 1 wherein said outlet orifice is asymmetric about its centroid.
3. The scanner nozzle of claim 1 wherein said outlet converges in a downstream direction at an angle of convergence that varies with perimetric location about the orifice.
4. The scanner nozzle of claim 1 wherein the centroid of the outlet orifice is transversely offset from the chamber axis.
5. The scanner nozzle of claim 1 wherein said outlet orifice is configured as a conical frustum converging in a downstream direction.
6. The scanner nozzle of claim 1 wherein said upstream and downstream ends are configured as substantially spherical segments having respective bases at which said segments are joined.
7. The scanner nozzle of claim 1 wherein said second member is defined in and through a plate of a sprayer in which a plurality of said second members of a respective plurality of scanner nozzles are formed integrally therein in an array.
8. The scanner nozzle of claim 7 wherein said plate is a front plate of a shower head.