shared by: Patents-358 on: Wednesday, April 11, 2012
This application is a U.S. National Phase Patent Application based on International Application Ser. No. PCT/EP2008/000507 filed Jan. 24, 2008, the disclosure of which is hereby explicitly incorporated by reference herein.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is directed to an insert body for a spray nozzle assembly, and to a spray nozzle assembly equipped with such an insert body. 2. Description of the Related Art One insert body for a spray nozzle assembly is known from U.S. Pat. No. 4,463,904 A. The prior insert body comprises a fan jet producing section, which can be impinged on by a fluid via an insert entrance channel and is adapted to produce anoscillating fan jet, issuing from a fan jet exit opening, in order to wet a surface, typically the windshield of a motor vehicle. Although a relatively large-area fan jet can be produced under certain temperature conditions by means of a spray nozzleassembly equipped with such an insert body, there is a problem in that in the presence of unfavorable fluid mechanical boundary conditions, for example a low temperature or a high relative speed of the spray nozzle assembly compared to the surroundingmedium, as is the case, for example, with a vehicle traveling at a relatively high speed, the fan jet fails to form or, due to the wind pressure, fails to impinge on the areas of the windshield that are to be wetted down.SUMMARY OF THE INVENTION The present invention provides an insert body for a spray nozzle assembly, by means of which a surface can be wetted reliably even under unfavorable boundary conditions. This object is further achieved according to the invention, in connection with a spray nozzle assembly, by means of a spray nozzle assembly comprising an insert body according to the invention. Because the insert body comprises, in addition to the fan jet producing section, a point jet producing section whose antechamber is in fluid mechanical communication with the insert
