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Nozzle for plasma torch and method for introducing powder into the plasma plume of a plasma torch
Nozzle for plasma torch and method for introducing powder into the plasma plume of a plasma torch
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机译：用于等离子炬的喷嘴和将粉末引入等离子炬的等离子羽流的方法
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摘要
Apparatus and method are disclosed for introducing powder into a stream of plasma generated in a plasma torch such as a plasma transferred arc torch.PPThe nozzle of the torch has a central base through which the stream of plasma flows, the bore being conically flared immediately adjacent the exit end of the nozzle. Powder is fed through feed bores in the nozzle to the conically flared portion of the central bore and is directed in the form of streams of powder toward the plasma streams at angles to the longitudinal axis of the central bore of between about 45° and about 50°, preferably 50°, with a velocity component in the direction of travel of the plasma stream. The streams of powder are fed sufficiently close to the plasma stream as to avoid spreading of the streams of powder before they reach the plasma stream, but not so close to the plasma stream as would cause plugging of the feed bores in the nozzle.
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