Powder feed device for flame spray guns
US3976332A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1972 |
| Grant date | Aug 24, 1976 |
| Priority date | — |
| Expiry date | Jan 19, 1992 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C4/129
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A device for feeding metal powders suspended in a conveying gas uniformly and controllably to a point of utilization such as a flame spray gun comprising an enclosed hopper which contains the powder in particulate loose and by and large unfluidized form and is supplied in its upper portion with a controlled amount of fluidizing gas. A conduit with a downwardly opening powder intake conduit passes through the lower portion of the hopper and is supplied with a conveying gas at a pre-determined rate. The fluidizing gas passes through the mass of solids and is diffused thereby. It converges towards the orifice, suspends the powder in the vicinity of the orifice, upturning into the orifice to do so, and propels the fluidized powder therethrough into the conveying gas. The amount of fluidizing gas flow determines the amount of solids placed in the conveying gas. The fluidizing gas flow is controlled inversely responsive to the pressure at a point in the conveying gas line. Preferably, a fluidic amplifier or controller is integrated into the system for the purpose of regulating the flow of the fluidizing gas. In this embodiment, the control gas for the amplifier is tapped from the conveyi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.