Liquid Fuel Bore Supersonic Flame Spray Gun

Abstract

The invention discloses a liquid fuel inner hole supersonic flame spray gun, which comprises a gun shell, a gun barrel, an oxygen delivery pipeline, a fuel delivery pipeline, an ignition line pipeline, a fuel injection nozzle, a stabilizer, a combustion chamber, a high temperature and high pressure gas convergence section, Elbow connector, powder feeding needle, gas compression throat, flame diffusion section, nozzle, water outlet at the bottom of the combustion chamber, spark plug and cooling water inlet pipe; The position where the stabilizer is connected, the spark plug is set at the position where the ignition line pipe is connected to the stabilizer, one end of the combustion chamber is provided with a stabilizer, and the other end is provided with an elbow connector, and the combustion chamber and the elbow connector are connected. The pipeline consists of a high-temperature and high-pressure gas converging section, a gas compression throat, and a flame diffusion section in sequence. The nozzle is set at the end of the flame diffusion section; the powder feeding port is located in the middle of the elbow connector. The invention can effectively increase flame speed, improve coating bonding strength and reduce porosity.

Description

[0001] Technical field: [0002] The invention relates to a flame spray gun, in particular to a liquid fuel inner hole supersonic flame spray gun, which adopts aviation kerosene fuel, can spray the inner wall of workpieces, and meets the coating requirements of high bonding strength. [0003] Background technique: [0004] The supersonic flame spray gun is generally used to spray the outer surface of the workpiece. For the narrow space with a diameter of less than 500mm, it is difficult to spray the inner surface of the narrow space with the conventional supersonic flame spray gun, because the flame of the conventional spray gun is sprayed axially and cannot change the direction of the flame. Direction and angle, so for inner wall or inner hole spraying, only special elbow inner hole spray gun can be used. The barrel of this spray gun has an included angle of 60 degrees or 45 degrees with the combustion chamber. Flame spray guns use gas fuel, and the pressure of gas fuel is not...

AI Technical Summary

Problems solved by technology

[0004] The supersonic flame spray gun is generally used to spray the outer surface of the workpiece. For the narrow space with a diameter of less than 500mm, it is difficult to spray the inner surface of the narrow space with the conventional supersonic flame spray gun, because the flame of the conventional spray gun is sprayed axially and cannot change the direction of the flame. Direction and angle, so for inner wall or inner hole spraying, only special elbow inner hole spray gun can be used. The barrel of this spray gun has an angle of 60 degrees or 45 degrees with the combustion chamber. Flame spray guns use gas fuel, and the pressure of gas fuel is not high. When this spray gun burns, the combustion chamber pressure is low, and the flame speed formed is low. When spraying the inner wall of a relatively narrow pipe or the inner hole of some workpieces, the sprayed The particle speed is generally 500m / s, and the particles hit the surface of the workpiece to form a coating. For the coating that requires high bonding strength (greater than 80Mpa) and low porosity (less than 1%), this gas inner hole spray gun cannot meet the requirements

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