Ultrasonic Spray Coating Assembly

摘要

Disclosed is an ultrasonic spray coating system wherein (1) the surface of the feed blade of the ultrasonic spray head has been modified to add a series shallow channels to redirect the ultrasonic surface wave system that exists on the surface; (2) the internal passageway of the liquid applicator has been modified to add a series of channels to uniformly feed the liquid from the liquid applicator to the spray-forming tip; (3) a positive displacement pump is utilized to deliver the liquid to the spray head at a precise flow rate independent of the associated resistances of the liquid delivery system components; and (4) the gas entrainment system has been improved so as to expand the ultrasonically produced spray uniformly and without pulsations.

主权项

1. An ultrasonic spray coating system comprising:
a converter for converting high frequency electrical energy into high frequency mechanical energy to thereby produce vibrations, a spray forming head coupled to said converter, said spray forming head having 1a narrowed spray forming tip with substantially planar opposing side surfaces, the spray forming tip terminating at a substantially planar atomizing surface, one of the side surfaces comprising a feed blade being substantially perpendicular to the atomizing surface; a high frequency alternating generator electrically connected to said converter for producing a controllable level and frequency of electrical energy at an operating frequency of said spray forming head and converter wherein the atomizing surface is uniformly displaced in a normal direction by the vibrations and wherein a surface wave component is induced in the first region along the feed blade, the surface wave component being in a direction toward the atomizing surface; a liquid applicator in close proximity with the first region of said feed blade and spaced therefrom, said liquid supply applicator having an output surface including an orifice therein, such that liquid supplied from the output orifice to the feed blade is caused to flow to and on said atomizing surface under the influence of said surface wave component and said liquid is atomized by the displacement of said atomizing surface and is thereby changed to a spray; and a controllable gas entrainment mechanism associated with said spray forming head, the gas entrainment mechanism including a primary gas director for directing a first stream of gas at a region of the side surface of the spray forming tip opposite said feed blade, an angle measured between the first stream of gas and the side surface opposite said feed blade being less than 90° such that the first stream of gas impinges off the region thereby forming a fan-shaped air pattern in a direction substantially normal to the atomizing surface for affecting and controlling said spray.