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US 7,478,763 B2Granted
Spray coating device for spraying coating material, in particular coating powder
AssigneeITW Gema AG
InventorsFelix Mauchle, Hanspeter Vieli, Hanspeter Michael
Life of this patent
Estimating the term…
Abstract
A spray apparatus for coating material, in particular for coating powders, contains a spray outlet spraying the coating material, a shaping air outlet in the form of a plurality of holes shaping the spray jet and an ambient-air passage radially configured between the spray outlet and the holes to aspirate ambient air by means of the flow suction effect of the spray jet and/or of the shaping air flow.
Claims15
Spray apparatus for coating materials comprising an apparatus housing, the apparatus housing further comprising:
- a coating powder duct;
- a spray outlet at a downstream end of the coating material duct, the spray outlet configured to spray the coating material onto an object to be coated;
- a shaping air outlet configured to adjustably shape compressed air, said shaping air outlet running near the spray outlet and around a flow path of the coating material apart from the flow path;
- and
- at least one electrode arranged in the flow path of the coating material at or close to the spray outlet, the at least one electrode configured to be connected to a high-voltage generator for electrostatic charging of the coating material;
- wherein the shaping air outlet is further configured to generate from compressed air, a shaping air flow enclosing a coating material spray jet, the shaping air outlet comprising a large number of holes in a body, said holes being configured in a distributed manner around the flow path of the coating, separated from the flow path, and pointing forward to the coating material spray jet, the holes being further configured such that the shaping air flow from the holes will converge to a cross-sectionally annular shaping air flow at the latest at a point of impact of the air flow with the flow path of the coating material spray jet, the distributed manner comprising an ambient-air passage that is radially inwardly offset relative to the holes and which runs from an ambient-air inlet situated behind the body to an ambient-air outlet situated in front of the body;
- and which further runs in the form of a single component or in the form of several apertures around and apart from the flow path of the coating material, whereby the ambient air can be aspirated from the ambient air inlet through the ambient-air passage toward the ambient-air outlet by means of a flow suction effect of the coating material spray jet and/or the flow suction effect of the shaping air flow.
4 more elements
A method of spraying a coating material, comprising:
- forming a coating material spray jet for spraying the coating material onto an object to be coated from a spray outlet at a downstream end of a spray apparatus having a coating material duct;
- adjustably shaping compressed air exiting air outlet running near the spray outlet and around a flow path of the coating material jet apart from the flow path, the compressed air exiting the air outlet via a large number of holes configured in a distributed manner around the flow path of the coating, separated from the flow path, and pointing forward to the coating material spray jet, the holes being further configured such that the shaping air flow from the holes will converge to a cross-sectionally annular shaping air flow at the latest at a point of impact of the air flow with the flow path of the coating material spray jet, the distributed manner comprising an ambient-air passage that is radially inwardly offset relative to the holes and which runs from an ambient-air inlet situated behind the body to an ambient-air outlet situated in front of the body;
- and which further runs in the form of a single component or in the form of several apertures around and apart from the flow path of the coating material;
- and
- aspirating ambient air from the ambient air inlet through the ambient-air passage toward the ambient-air outlet by means of a flow suction effect of the coating material spray jet and/or the flow suction effect of the shaping air flow.
2 more elements
Dependencies are inferred from the claim text.