SU1500377A1 - Atomizer for electrostatic application of powder coatings - Google Patents

Abstract

The invention relates to devices for electrostatic spraying of materials and can be used for applying powder coatings to articles. The aim of the invention is to increase the reliability when spraying abrasive powder materials, which is achieved by supplying the sprayer with a cylindrical insert 8 with an axial channel fixed along the axis of the housing 1, the high-voltage electrode 4 being installed in the housing 1 with an annular gap for the passage of the powder-air mixture, and the tubular supply 6 is made in the form of an annular manifold 12 enclosing the insert 8 with an end groove 13 communicated by the insertion channel 8 with the compressed air supply duct 3, while the high-voltage electric bearing Troda 4 is fixed on the insert 8 and is located in the cavity of the end groove 13 of the tubular supply 6. 2 Il.

Description

31500

The invention relates to devices for electrostatic spraying of materials and can be. Used for applying powder coatings to products.

The aim of the invention is to improve the reliability when spraying abrasive powder materials -.

Fig. 1 shows a sprayer for electrostatic powder coating; figure 2 - view And figure 1.

The atomizer contains a hollow cylindrical body 1 of a dielectric material with a channel 2 for supplying a powder-air mixture and a channel 3 for supplying compressed air,

The housing 1 contains a charging unit, made in the form of a high-voltage electrode 4 with blades 5 attached to it, a tubular supply 6 with a plug 7 and a cylindrical insert 8c with the axial channel 9. The cylindrical insert 8 is installed along the axis of the housing 1 and fixed in it .in the sleeve 10 with a channel 11.

The tubular supply 6 is made in the form of an annular collector 12 enclosing the insert with an end groove 13 and tangential holes 14 directed to the vanes 5. The annular collector 12 is in communication with channels 9, 11 with a channel 3 for supplying compressed air. The high-voltage electrode 4 is installed in the housing 1 with an annular gap and fixed on the bearing 15 with the possibility of axial rotation. The bearing 15 is fixed on the cylindrical insert 8 and is located in the cavity of the end groove 13.

On the periphery of the high-voltage electrode 4 is installed corona needle 16 different lengths. A high voltage is supplied to the high-voltage electrode 4 through the input 17 and the sleeve 10 and the insert 8 connected to it. A reflective element 18 is fixed on the microdynamic insert 8.

At the base of the high-voltage electrode 4, holes 19 are formed, which form annular gaps 20 and 21, formed by the reflective element 18j by the high-voltage electrode 4 and the end wall of the tubular supply 6.

The spray works as follows.

When applied to a high voltage high voltage electrode 4, a corona zone is formed in the area of the needles 16. The air-powder mixture flowing through the channel 2 bends around the reflective element 18 and passes through the annular gap between the high-voltage electrode 4 and the housing 1.

With the passage of particles of the powder material in the zone of corona discharge, they acquire an electric charge and are directed by an electrostatic field to the surface of the product.

The compressed air entering through the channel 3 passes through the channels 11 and 9 into the annular collector 12, is directed through the tangential holes 14 to the vanes 5 and causes the high-voltage electrode 4 to rotate.

The rotational movement of the electrode 4 with the corona needles 16 leads to a twisting of the powder-air mixture, increases the time the powder is in the zone of corona discharge and contributes to its more efficient charging.

The air reflected from the blades 5 exits through the annular gaps 20 and 21, washes the high-voltage electrode 4 and the corona needles 16 and prevents powder particles from sticking to them. I The air flows created in the cavity of the end undercut 13 reduce the possibility of powder getting into the bearing 15 of the high voltage electrode 4, which increases the reliability of the sprayer.

Claims (1)

Invention Formula The diffuser for electrostatic powder coating, containing a hollow cylindrical body of dielectric material with 1 canals for supplying a powder-air mixture and compressed air, a charging unit made in the form of a high-voltage electrode with blades fixed on it, mounted on the housing axis — on a bearing with the possibility of axial rotation, and a tubular feed with a closed end and tangential apertures facing the blades, ex. due to the fact that, in order to increase reliability when dividing abrasive powders materials, it is provided with a cylindrical insert with an axial channel fixed along the axis of the housing, with a high-voltage electrode installed in the housing with an annular gap for the passage of the powder-air mixture, and the tubular supply is made in the form of an annular collector covering the insert with an end groove provided by the insert channel with the inlet channel compressed air, while the bearing high-voltage electrode is fixed to the insert and is located in the cavity of the end groove of the tubular supply. MA