Spiral-flow type supersonic speed electric arc spraying gun

Abstract

The invention discloses a spiral-flow type supersonic speed electric arc spraying gun, which comprises a gun body, wherein a contact tip is connected onto a conducting wire; airflow holes are uniformly distributed on a radial airflow channel arranged in the gun body; a spiral-flow ring is connected with the gun body through screw threads; spiral-flow holes are uniformly distributed on the periphery of the spiral-flow ring; an air gathering hood is fixed with the spiral-flow ring through screw threads; a ceramic nozzle is pressed in the spiral-flow ring through the air gathering hood; and an inner cavity of the ceramic nozzle and an inner cavity of the air gathering hood are combined to form a Laval nozzle. According to the technical scheme, spiral-flow atomization and supersonic speed atomization are combined, the effect and the stability of jet flow atomization are enhanced through a spiral-flow structure and a Laval spray pipe, secondary acceleration of jet flow is realized, and the speed of jet flow is further improved, so that the spray coating particle hole atomization effect is stronger, nanometer refinement is achieved, flying speed achieves supersonic speed, and the prepared coating layer is obviously improved. The spiral-flow type supersonic speed electric arc spraying gun is not only suitable for coating equipment for precision parts, but also suitable for large-area coating preparation.

Description

Technical field: [0001] The invention relates to a spray gun, which is especially suitable for use in the field of welding. Background technique: [0002] Patent No. 97208364.2 of "A Supersonic High Speed ​​Arc Spraying Device" authorized by the State Patent Office. The device has a control power supply, a wire feeding mechanism, a compressed air supply device and a spray gun. The main body of the spray gun is a Laval nozzle. There are two channels through which the conductive nozzle can be obliquely penetrated, through which the metal wire is used as a consumable electrode, and the high-pressure air flow is sent into the Laval nozzle through the air inlet. Its shortcoming is that practice has proved that existing supersonic arc spray guns still have problems such as poor atomization effect, poor jet converging, unstable spray jet, low spray particle velocity, easy to cause particle splashing and agglomeration, and problems including coating The coating quality is not high...

AI Technical Summary

Problems solved by technology

Its shortcoming is that practice has proved that existing supersonic arc spray guns still have problems such as poor atomization effect, poor jet converging, unstable spray jet, low spray particle velocity, easy to cause particle splashing and agglomeration, and problems including coating High layer porosity, rough surface, coarse sprayed particles and other coating quality are not high, which limits the further improvement of the coating properties prepared by it

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