Powder spray coating injector device
First Claim
1. An injector device for powder spray coating material comprising an adapter having an injector duct which extends between first and second ends and having at least one compressed air duct extending to said first end, said injector duct having a straight axis and terminating at a vacuum chamber adjacent said first end, a front section attached to said first end of said adapter, said front section having an injector nozzle with a nozzle orifice located on said axis and adapted to direct a flow of powder conveying air received from said at least one compressed air duct in said adapter axially into said injector duct, such flow of powder conveying air creating a reduced pressure in said vacuum chamber, at least one powder intake duct extending through said front section to a front face and connecting to said vacuum chamber, and at least one fluidizer on said front face of said front section having a plurality of small air passages adapted to discharge fluidizing air received from said at least one compressed air duct in said adapter into a space adjacent said front section to fluidize powder in such space.
1 Assignment
0 Petitions
Accused Products
Abstract
Powder spray coating injector device consisting generally of three tubes nested coaxially. Fluidized powder is carried through an inner one of the tubes and compressed air is carried through annular passages between the inner tube and an intermediate tube and between the intermediate tube and an outer tube. The compressed air is used by a fluidizer to fluidize the powder coating material and by an injector to convey the fluidized powder coating material to a conventional powder spray applicator. Upstream ends of the tubes, relative to the direction of powder feeding, are connected via an adapter to an end section. The end section is provided with at least one fluidizer and the injector through which fluidized power is sucked. Any residual powder is easily cleaned from the injector device by positioning a cap over the fluidizer and injector and by delivering compressed air to the cap while fluidizing and injector air is supplied to the device.
15 Citations
11 Claims
- 1. An injector device for powder spray coating material comprising an adapter having an injector duct which extends between first and second ends and having at least one compressed air duct extending to said first end, said injector duct having a straight axis and terminating at a vacuum chamber adjacent said first end, a front section attached to said first end of said adapter, said front section having an injector nozzle with a nozzle orifice located on said axis and adapted to direct a flow of powder conveying air received from said at least one compressed air duct in said adapter axially into said injector duct, such flow of powder conveying air creating a reduced pressure in said vacuum chamber, at least one powder intake duct extending through said front section to a front face and connecting to said vacuum chamber, and at least one fluidizer on said front face of said front section having a plurality of small air passages adapted to discharge fluidizing air received from said at least one compressed air duct in said adapter into a space adjacent said front section to fluidize powder in such space.
Specification