SU990322A1 - Electric metallizer spraying head - Google Patents

Description

(54) SPRAY HEAD OF ELECTRIC METALIZER

one

The invention relates to devices for applying metallization coatings on the surfaces of machine parts and metal structures, in particular for anticorrosion protection.

The known sputtering head of the electrometallizer comprises a housing, current-carrying jaws, electrode wire guides and an air tube with a nozzle, which is made with a cylindrical nozzle 1.

A disadvantage of the known head is the increased consumption of compressed air (40-60 m / h), which adversely affects the thermal mode of the metallization process, contributes to intensive oxidation and cooling of metallization particles. The flow rate of the air-spray jet from the nozzle, and therefore the flight speed of the metallization particles, is low. All this has a negative effect on the quality of metal platings, namely, it increases their porosity and decreases the strength of adhesion to the sprayed metal.

In addition, the air jet has a large opening angle, resulting in braking of the peripheral layers.

jet on the air environment. The jet energy is reduced at the same time. The dispersion of the molten electrode metal is deteriorating.

Due to the fact that the nozzle is located 5 in the immediate vicinity of the melting point of the electrode wire, the sticking of molten metallization particles onto the nozzle surface takes place.

The aim of the invention is to increase

Q coating quality and reliability

by increasing speed and reducing

the angle of the spray air

jet.

This goal is achieved by the fact that in the sputtering head of an electrometal torch, which includes a housing, current-carrying jaws, guide electrodes, and an air tube with a nozzle, the latter is made with a confusor-diffuser nozzle, and the ratio of the output diameter and the critical diameter of the nozzle early is 1.029-1.034 .

. The drawing shows a spray head, a general view.

Claims (1)

The spray head includes a housing 1 with current-carrying jaws 2 and 3 placed therein, guides 4 of the electrode wire and an air tube 5, at the end of which a replaceable nozzle 6 s is installed, a confusion-diffuser nozzle 7, the ratio of output and critical diameters is from 1.029 to 1.034. Sprayed ush, and the head works in the following way. At the moment of ignition of the arc between the electrode wires, compressed air under a pressure of 5.5-6 kg / cm is supplied to the tube 5, after which it enters the nozzle 7 of the nozzle 6, where the high-speed spray jet is formed. At the exit of the nozzle, the jet interacts with the sprayed arc of the electrode metal, disperses it to the smallest particles and transports these particles to the metallized surface. By colliding the metallization particles with the sprayed surface, a coating is formed. The quality of metal platings (namely density) during the spraying of pump cases and supporting metal structures of gas pipelines increased threefold, and the economic effect from the introduction is 63.0 thousand rubles. An atomization head of an electrometallizer comprising a housing, current-carrying jaws, electrode wire guides and an air tube with a nozzle, characterized in that, in order to improve the quality of coatings and reliability of operation, by increasing the speed and reducing the opening angle of the spray air jet, the nozzle is made with confusor diffuser nozzle, and the ratio of the magnitude of the output and the critical diameter of the nozzle is chosen equal to 1,029-1,034. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 802394, cl. C 23 C 7/00, 1977 (prototype).