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US 4,289,278 AGranted
Powder electro-charging device and electrostatic powder painting device
AssigneeOnoda Cement Co., Ltd.
InventorTsutomu Itoh
Life of this patent
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AssigneeOnoda Cement Co., Ltd.
InventorTsutomu Itoh
Estimating the term…
An electrostatic powder painting device provided with an improved powder electro-charging device is described herein, which painting device comprises a duct for conveying powder suspended in gas, an electrode chamber communicating with a slit formed along the entire inner circumference of said duct, a ring electrode disposed within said electrode chamber and having a substantially large radius of curvature in cross-section, a corona discharge electrode disposed at the center of said duct, gas introduction means into said duct through said slit, a voltage source for applying a voltage between said corona discharge electrode and said ring electrode, and means disposed in the proximity of the outlet end of said duct for regulating an ejection pattern of a powder cloud, whereby said painting device can maintain an highly excellent charging performance over a long period of time when the powder conveyed by the gas is charged with unipolar electric charge and also the most important performance of an electrostatic powder gun, i.e., a greatly enhanced transfer efficiency, penetration capability and wrapping-around capability for carrying out electrostatic powder painting.
A powder charging device characterized in that said device comprises a duct for conveying powder as suspended in gas, an annular electrode chamber positioned outside of said duct and communicating with said duct through a slit extending substantially along the entire inner circumference of said duct, a ring electrode disposed within said electrode chamber and having a substantially large radius of curvature in cross-section, a corona discharge electrode disposed at the center of said duct, means for introducing gas into said duct through said slit, and means for applying a voltage between said respective electrodes.
An electrostatic powder painting device comprising a duct for conveying powder as suspended in gas, an annular electrode chamber positioned outside of said duct and communicating with said duct through a slit extending substantially around the entire inner circumference of said duct, a ring electrode disposed within said electrode chamber and having a substantially large radius of curvature in cross-section, a corona discharge electrode disposed at the center of said duct, means for introducing gas into said duct through said slit, means for applying a voltage between said respective electrodes, and means disposed in the proximity of the outlet end of said duct for conveying said powder for regulating the ejection pattern of a powder cloud.
An electrostatic powder painting device comprising a duct for conveying powder as suspended in gas, an annular electrode chamber positioned outside of said duct and communicating with said duct through a slit extending substantially around the entire inner circumference of said duct, a ring electrode disposed within said electrode chamber and having a substantially large radius of curvature in cross-section, a corona discharge electrode disposed at the center of said duct, means for introducing gas into said duct through said slit, means for applying a voltage between said respective electrodes, and means disposed in the proximity of the outlet end of said duct for conveying said powder for regulating the ejection pattern of a powder cloud;
Dependencies are inferred from the claim text.