ELECTROSTATIC SPRAY NOZZLE ASSEMBLY

摘要

An air assisted electrostatic liquid spray nozzle assembly having a relatively long elongated nozzle body with a spray tip and surrounding air cap disposed at a downstream end of the nozzle body. The spray nozzle assembly includes an upstream electrode for connection to a high voltage electric source, an elongated feed tube, an electrically enhancing stinger, and the spray tip which are secured and retained by the air cap in electrically conductive relation to each other such that liquid passing through liquid passages of the electrode, feed tube, stinger, and spray tip is discharged in an electrostatically charged pattern of liquid particles. The air cap is removable to permit easy removal and replacement of the spray tip, stinger, and liquid feed tube.

主权项

1. An electrostatic spray nozzle assembly comprising:
an input head made of non-electrically conductive material, an elongated hollow nozzle body supported by said input head made of non-electrically conductive material, said input head having a liquid inlet for coupling to a liquid supply, an electrode supported within said head for connection to a high voltage electrical source, said electrode having a liquid passage communicating with said liquid inlet, an elongated feed tube made of electrically conductive material disposed within said elongated nozzle body having a liquid passage communicating with said electrode liquid passage, said feed tube and elongated nozzle body defining an air flow passage having a pressurized air inlet for coupling to a pressurized air source, a spray tip made of electrically conductive material at a downstream end of said nozzle body having a liquid passage in communication with said feed tube liquid passage and a discharge orifice for discharging liquid from the spray nozzle assembly, an air cap secured to a downstream end of said elongated nozzle body for securing and retaining said spray tip, liquid feed tube, and electrode in electrically conducting relation to each other such that upon coupling of said electrode to an high voltage electrical supply source, liquid passing through said liquid passages of said electrode, feed tube, and spray tip is electrically charged for discharge form said spray tip in a pattern of electrostatically charged liquid particles, and said air cap defining an air flow passage about said spray tip in communication with said air passage defined by said feed tube and nozzle body and having an air discharge orifice from which pressurized air is directed about said pattern of electrostatically charged liquid particles discharging from said spray tip.