Plasma spray gun for internal coatings
AssigneePlasmainvent AG
InventorsHeiko Gruner, Markus Muller
Life of this patent
Estimating the term…
Abstract
In a plasma spray gun (1) including a cooled electrode (10) and burner nozzle (12) for insertion in pipes and bores of work pieces and for coating the inner surfaces of these work pieces, for the coating of bores with a minimal diameter of 25 mm the electrode (10) is designed rotation-asymmetrically in the area of its head (15), and the diameter of the electrode (10) is smaller than the minimal inner diameter of the burner nozzle (12), while the burner nozzle (12) on the end facing away from the electrode (10) has at least one partial area (17) with an inner diameter which is larger than its minimal inner diameter, and the powder injector (13) has a flat exit cross-section.
Claims11
A plasma spray gun for insertion into pipes and bores of work pieces and for coating the internal surfaces of said work pieces, comprising:
- (a) an electrode having a longitudinal axis and a shape that is radially symmetrical relative to the longitudinal axis, said electrode including an electrode head that has a plurality of surface features within whose peripheries the electrode head deviates from being radially symmetrical;
- (b) a burner nozzle in which said electrode is partially and coaxially disposed, said burner nozzle having a minimum inner diameter that is larger than the maximum outer diameter of said electrode;
- (c) said burner nozzle having an outer area whose inner diameter is larger than the minimum inner diameter of said burner nozzle;
- and
- (d) a powder injector tube arranged at said outer area of said burner nozzle and having a flattened cross-sectional powder exit opening into said burner nozzle.
Dependencies are inferred from the claim text.