SU503601A1 - Spray Torch - Google Patents

Description

I

The invention relates to devices that are used to apply itpbiTHfi from powders of refractory materials by spraying.

Plasma torches are known for applying lokryty, predominantly refractory materials, containing cathode, nozzle and communications for the supply of gas, cooling medium and powders.

Since the scraper and the carrier gas are cooled in the arc of the arc, the latter can occupy a different, more energetically advantageous position. The arc is usually mixed inside the nozzle. With this design it is difficult to obtain high-density coatings on large surfaces.

i To improve the quality of the coatings, the plasma torch is equipped with an electrically neutral2 powder feed unit installed (coaxially with the cathode and the anode between them and; Made in the form of a housing with a limiting bushing with an end

the surface of the groove, communicating with the powder feed communications.

The drawing shows schematically the proposed plasma torch, a longitudinal section.

I It consists of the plasma torch body 1, into which the nozzle-anode 2 is pressed. K (The plasma torch body 1 is fastened through the isolating 1 gasket 3 to the powder feed unit consisting of the body 4 and the limiting sleeve 5, on the outer surface of the cylindrical groove and the conical end, as well as the axial hole for the passage of the arc. It is pressed into the body 4 of the powder supply unit so that its conical end

forms with a conical groove in the housing.

Ice narrow A conical channel that serves to focus the powder on the axis of the plasma torch. To the case 4 of the powder supply unit through the insulating gasket 6, fastens: with the cathode assembly consisting of the cathode detector 7 and the cathode 8,

 2-7 oleopathrons have an associated coolant for cooling; 1 water;

The plasma torch is connected to a constant electric current source (to nozzle 9, (+) to nozzle 10.) cooling water is also connected to these nozzles.

Pipe 11 will be folded to supply plasma-forming gas, and pipe 1 will be folded to supply Powder.

. The proposed structure works as follows; Between | The equestrian cathode 6 and the sump anode 2 burn an electric arc. The arc passes through the axial openings and sleeves S. The plasma-forming gas, the passage through the electric arc, is heated to a high temperature and flows through the axial hole in the nozzle of the anode 2 in the form of a torch. The powder is fed into the plasma torch by means of a carrier gas through the tube 12. Then, the passage of the annular gap and the conical channel of the feed unit, the post (falls into the arc gap.

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Since the powder supply unit is located in the gap between the cathode and the nozzle and is isolated from them, the powder is guaranteed to fall into the hottest area of the arc gap, which ensures the best penetration of the grains of the applied material.

Claims (1)

Invention Formula : Plasma torch for spraying, predominantly refractory materials containing cathode, nozzle-anode and communications for supplying gas, cooling medium and powders. and an anode between them and an impressed in the form of a body with a limiting bushing located therein with a collar butt having a groove on the outer surface in communication with the powder supplying communications. eight eleven