Inner bore supersonic speed flame gun for liquid fuel

Abstract

The invention discloses an inner bore supersonic speed flame gun for a liquid fuel. The flame gun comprises a gun housing, a gun barrel, an oxygen conveying pipeline, a fuel conveying pipeline, an ignition line pipeline, a fuel spray nozzle, a stabilizer, a combustion chamber, a high-temperature high-pressure gas gathering section, an elbow connector, a power feeding needle, a gas compressing throat, a flame diffusion section, a nozzle, a bottom water outlet of the combustion chamber, a sparking plug and a cooling water inlet pipeline; the combustion chamber is located in the gun barrel, the fuel spray nozzle is arranged in a position where the fuel conveying pipeline and the stabilizer are connected, the sparking plug is arranged in a position where the ignition line pipeline is connected to the stabilizer, the stabilizer is arranged at one end of the combustion chamber while the elbow connector is arranged at the other end, the high-temperature high-pressure gas gathering section, the gas compression throat and the flame diffusion section are successively arranged in the through pipeline after the combustion chamber is connected to the elbow connector, and the nozzle is arranged at the tail end of the flame diffusion section; the power feeding port is located in the middle position of the elbow connector. The inner bore supersonic speed flame gun disclosed by the invention can effectively improve the flame speed and the bonding strength of the coating and reduce the 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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