Device for applying a coating of powder materials

 

(57) Abstract:

The invention relates to a device for coating the inner walls of long products in blind holes and through holes and can be used in metallurgical, machine-building and metal cutting industries. The essence of the invention is a device consisting of a body, a supersonic nozzle 1, the intermediate nozzle 2, a shaped Central body 3, the collector 4 two-phase mixture, a perforated bushing 5 with channels for supplying gas 6 and the two-phase mixture 7, pipe 8 for supplying gas and suspended particles in the gas 9, the workpiece 10. The device creates a supersonic for two-phase flow in a specified direction with the necessary thermal and gas-dynamic parameters for the formation of coatings, allows the expansion of technology and functionality of the coating. The device allows you to apply a coating of a given thickness on the inner surface of the extended products of various configurations, not rotating around its axis, and also in blind holes and through holes. 1 Il.

The invention relates to a device for coating the inner surface isdale (pipes, fittings, blind and through holes, and so on).

A device for coating containing the mixing chamber at supersonic nozzle, a hopper for powder mixtures with feeder-feeder and feeder system of the working gas.

The known device does not allow to apply the gas-dynamic coating method on the entire surface without rotation on the inner wall products, blind holes and through holes

The aim of the invention is the expansion of technological possibilities coating on the inner surface without rotation around its axis, and also in blind holes and through holes.

The objective is achieved in that the device for coating containing the delivery system of two-phase flow with feeder-dispenser, mixing chamber and the nozzle is provided with an intermediate nozzle, placed along the axis in the region of the critical section of a supersonic nozzle, and a shaped Central body located at the exit of the supersonic part of the nozzle on its axis, forms a surface for supersonic gas flow in the intermediate nozzle and changes the direction of gas and two-phase supersonic flow and intermediate nozzles.

On the th nozzle 1, intermediate nozzle 2, a shaped Central body 3, the collector two-phase mixture 4, the perforated bushing 5 with channels for supplying gas 6 and the two-phase mixture 7, pipe 8 for supplying gas and suspended particles in the gas 9, the workpiece 10.

The device offers the possibility to adjust the parameters of the expiration of the two-phase flow and the direction of its flow by replacing the Central body having a different profile, and the reciprocating movement of it along the nozzle axis.

The device operates as follows.

Gas under pressure is supplied via the inlet pipe 8 and the channels 6 in the chamber intermediate the nozzle 2. The profiled surface of the Central body 3 and the inner wall of the intermediate nozzle 2 form a supersonic upper plot. Accelerated thus to supersonic velocity of the gas stream due to expire in the supercritical part of the supersonic nozzle 1 forming the current supersonic speed parietal layer of gas in the supercritical section of the Central body 3. Suspended particles in the gas necessary for forming the coating concentration is supplied under pressure into the reservoir 4 and the channels 7 of the perforated bushing 5 in the upper area of the nozzle is I profile the Central body 3, nozzle 1 and the current on the surface of the Central body 3 parietal layer of gas. The output of the device formed by the nozzle 1 and the Central body 3, there is a mixing of two-phase flow, flowing from the nozzle 1, and the flow of gas flowing from the nozzle 2. Thus obtained two-phase mixture is output from the device the required speed, concentration and direction for forming a coating on the inner surface of the product 10. The thickness of the coating depends on the concentration of particles in the gas and the speed of pulling the device along the axis of the workpiece.

The proposed device creates for supersonic two-phase flow in a specified direction with the necessary thermal and gas-dynamic parameters for the formation of coatings, allows the expansion of technology and functionality of the coating.

The device allows you to apply a coating of a given thickness on the inner surface of the extended products of various configurations, in blind holes and through holes of products, not rotating around its axis.

Device for applying a coating of powder materials containing feeder-dispenser, the gas supply system and the hour of the second body, located at the exit of the supersonic part of the nozzle along their axis, and the intermediate nozzle is placed along the axis of the supersonic nozzle in the area of critical section last.

 

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