Fluid sprinkling – spraying – and diffusing – Electrostatic type – Fixed member deflects exiting material
Patent
1994-06-21
1995-04-04
Grant, William
Fluid sprinkling, spraying, and diffusing
Electrostatic type
Fixed member deflects exiting material
239690, 239706, 239600, B05B 5047
Patent
active
054029406
ABSTRACT:
A tribo-electric powder spray gun includes a diffuser for mixing powder with a conveying gas, a charging portion downstream of the diffuser, and a sprayhead at the outlet of the charging portion for dispensing the charged powder. The charging portion has an inner core removably positioned within a hollow outer cylinder with an annular gap formed between the outer cylinder and inner core providing a charging flowpath for the powder. The inner core and the outer cylinder have undulating or wavy charging surfaces made of an electrically insulating material, so that the annular gap provides a tortuous path for the powder, enhancing powder contact and the charge imparted to the powder. Grounding is provided by surface conduction of the electrically insulating contact material through a ground ring located outside the powder path at the inlet to the charging portion of gun where the greatest amount of charging occurs. By locating the ground ring outside the powder path, the ground ring is kept clean and the amount of charging surface is maximized. The inner core and the outer cylinder are longitudinally symmetrical to facilitate re-assembly.
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Tribomatic.RTM. Automatic Powder Spray Gun, Manual No. 37-1, copyright 1990, pp. 3 and 12.
Tribomatic.RTM. Generation 3 Automatic Gun Diffuser, Manual No. 37-17, copyright 1991, p. 1.
Crum Gerald W.
Haller Curtis B.
Knobbe Alan J.
Grant William
Nordson Corporation
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