Apparatus for applying a pesticide spray

Abstract

Particles of spray solution are given with an electrostatic charge by applying voltage of 300 to 800 V thereon as the solution passes through the tip of the spray nozzle of an electrostatic spray dispenser. The tip of the spray nozzle is separate and adjustable with respect to the nozzle and has on its inner surface the electrode

What is claimed is: 
     
       1. Electrostatic spray apparatus, comprising a hermetically sealed tank defining a chamber having a round-shaped bottom for storage of a solution containing particulate matter, a source of compressed air, a nozzle extending outwardly of said tank through which the compressed air is converted into a spray, a cap located on the tip of aid nozzle through which said spray passes, said cap having located on its interior surface a ring shaped electrode connected to a source of electric current, means for entraining said solution in compressed air comprising a pair of concentrically arranged tubes open at each end extending vertically into said chamber and having its lower end in said solution, said inner tube defining a passage connected at its upper end to said nozzle, said inner and outer tubes defining therebetween an annular passage connected at its upper end to said source of compressed air, a manifold mounted on the lower end of said inner and outer tubes adjacent the round bottom, said manifold being provided with radially directed air outlets communicating with said annular passage through which a portion of the compressed air is discharged in the said solution, and having the inner tube passing through the manifold so that the movement of compressed air through said annular passage is forced through said solution for simultaneously pressurizing and mixing said solution prior to passage through said inner tube for expulsion through said nozzle and means for maintaining said source of electric current at a selected voltage between 300 and 800 V to obtain a uniformly high electrostatic charge on the particles within said spray as said spray is ejected from said nozzle so that said spray is long floating and highly adherent.