High pressure coaxial flow nozzles

Claim 1

A high pressure nozzle operable for producing spaced fluid streams or a single stream of fluid having sufficient momentum so as to clean an article by the force of the fluid stream issuing from said high pressure nozzle comprising: a first member for connecting to a constant volume supply of high pressure fluid; said first member having at least two openings therein including a first fluid passage and a central fluid outlet, said first member operable for permitting continuous discharge of a high momentum fluid stream through said central fluid outlet, said first member reducing the diameter of the fluid stream flowing therethrough without bending the fluid stream emanating from said central fluid outlet; said first member having a frusto-conical fluid directing surface for directing a fluid stream thereover and a fluid deflector surface for directing a second stream of fluid alongside and spaced from the fluid stream emanating from said central fluid outlet; a second member connected to said first member, said second member movable with respect to said first member, said second member having a frusto-conical fluid directing surface for directing a fluid stream thereon; said frusto-conical fluid directing surface on said second member and said frusto-conical fluid directing surface on said first member coacting to define a second fluid passage for directing fluid onto said fluid deflector surface; said second fluid passage operable for being opened and closed by movement of said second member with respect to said first member to thereby produce spaced fluid streams or a single high momentum fluid stream; and a diverging section located in said second member, said diverging section spaced from said first member and said fluid deflector surface, said diverging section and said fluid deflector surface located at a diverging angle to one another so that fluid from said second fluid passage which is directed onto said fluid detector surface does not impinge on said diverging section, said diverging section extending substantially beyond said central fluid outlet so that said central fluid nozzle is shielded by said second member.