Dual orifice spray nozzle using two swirl chambers

Claim 1

A nozzle for spraying fluids comprising a nozzle body, said body including first means forming a first swirl chamber having a substantially flat bottom wall and a side wall with a portion thereof in the shape of an arc of a curve, said first means including a single inlet only for receiving a first fluid to be sprayed and conveying it to said first swirl chamber, said first means producing a sprial fluid flow in said first swirl chamber, means forming a first orifice providing the outlet of said first swirl chamber for the first fluid to exit therefrom, said first orifice having a lower surface in communication with said first swirl chamber and an upper surface, and a second means forming a second swirl chamber having a substantially flat bottom wall and a side wall with a portion thereof in the shape of an arc of a curve, said second swirl chamber of said second means is formed surrounding said means forming said first orifice with the depth of the second swirl chamber being greater than the height of said first orifice, said second means including a single inlet only for receiving a second fluid and conveying it to said second swirl chamber, said second means producing a spiral fluid flow in said second swirl chamber, and means forming an outlet for the second fluid adjacent the location where the first fluid exits from adjacent said first orifice commencing at a location which is substantially coplanar with said upper surface of said means forming said first orifice whereby said first and second fluids are mixed.