Gas detonation coating apparatus

Claim 1

A gas detonation coating apparatus comprising: a casing; a barrel at least partially enclosed in the casing, having a through space formed by an inner surface, an initial portion and an end portion, a first, a second and a third hole in said initial portion; a first pipe arranged in the initial portion having an inner surface and a first and a second end, with said first end in communication with the through space through said first hole in the initial portion of said barrel; a second pipe having a first and a second end with said first end thereof in communication with the through space through said second hole of the initial portion of said barrel; a spark plug arranged in communication with said first pipe; a cover having an inner surface covering the third hole of the initial portion of the barrel and an outer surface, the cover having a hole for passage of a conduit for admitting a powder discharging end of a powder spraying means into the through space of the barrel; a buffer unit, adjacent said outer surface of said cover, comprising: a casing; a first gas conduit arranged in the casing having an inlet and an outlet, with said outlet thereof gas-tightly associated with said second end of the first pipe; a second gas conduit having an inlet and an outlet, with said outlet thereof gas-tightly associated with said second end of said second pipe; the powder discharging end of a powder spraying means being inserted into said barrel through a hole in said casing of said buffer unit and the hole in said cover; a gas heating means integrally associated with the initial portion of the barrel and the cover; a gas heating control means to control the temperature of the gas in the initial portion of the barrel; and a gas supply means having a first and a second outlet, said first and second outlets gas-tightly communicating with the inlets of the first and second gas conduits.