초록 ▼

A high velocity thermal spray gun includes a nozzle member injecting an annular flow of combustible mixture at high pressure into a constricted gas cap. An outer flow of air is injected adjacent to the gas cap wall. Powder is fed axially from the nozzle member into the combustion chamber. An annular

A high velocity thermal spray gun includes a nozzle member injecting an annular flow of combustible mixture at high pressure into a constricted gas cap. An outer flow of air is injected adjacent to the gas cap wall. Powder is fed axially from the nozzle member into the combustion chamber. An annular inner flow of air is injected coaxially outwardly of the powder. The nozzle face has a shallow annular slot therein between the outer and inner gas injections. Combustion gas and oxygen flow through separate annular gas channels to mutually impinge at the inlet end of the slot for effectual mixing, so that combusting of the combustible mixture is rooted in the annular slot.

대표청구항 ▼

A thermal spray gun for spraying at high velocity, comprising a nozzle member with a nozzle face and an axis, a gas cap with an inwardly facing cylindrical wall defining a combustion chamber extending from the nozzle face to an open end, combustion means for injecting an annular flow of a combustibl

A thermal spray gun for spraying at high velocity, comprising a nozzle member with a nozzle face and an axis, a gas cap with an inwardly facing cylindrical wall defining a combustion chamber extending from the nozzle face to an open end, combustion means for injecting an annular flow of a combustible mixture of a combustion gas and oxygen from the nozzle member coaxially into the combustion chamber at a pressure therein of at least three bar above atmospheric pressure, outer gas means for injecting an annular outer flow of pressurized non-combustible gas adjacent to the cylindrical wall radially outward of the annular flow of the combustible mixture, feeding means for feeding heat fusible powder in a carrier gas coaxially from the nozzle member into the combustion chamber proximate the axis, and inner gas means for injecting an annular inner flow of pressurized gas from the nozzle member into the combustion chamber coaxially between the combustible mixture and the powder-carrier gas, such that, with combusting of the combustible mixture, a high velocity spray stream containing the heat fusible powder is propelled through the open end; wherein the combustion means comprises the nozzle face having a shallow annular slot therein between the outer gas means and the inner gas means, and gas mixing means disposed in the nozzle member, the mixing means adjoining the annular slot and communicating therewith, and the mixing means being receptive of separate flows of the combustion gas and the oxygen for mixing the flows and effecting the combustible mixture into the annular slot, whereby the combusting of the combustible mixture is rooted in the annular slot.