SU772601A1 - Head for spraying materials - Google Patents

Description

one

The invention relates to devices for spraying materials and may find application in the application of protective coatings, for example, in electric paint systems.

A known nebulizer containing a conical spray nozzle, which is mounted on the hollow shaft of the drive mechanism, which is also a material conduit.

However, ke nebulisers ensured / complete staining of hard-to-reach internal cavities and other shielded surface areas, which are additionally painted over manually. In addition, using cup-shaped nebulizers, materials are applied in an electric field only with certain electrophysical characteristics, which can measure the specific volume resistance within

J. SlO - OmSM. Materials that do not meet the requirements of electric paint are poorly sprayed, forming large droplets.

Also known is a head for spraying materials, comprising a housing, a drive shaft mounted therein with a channel for feeding the spraying material, a spray nozzle fixed thereto, concentrically covering its nozzle forming an annular gap with the nozzle, and a source of compressed gas 2.

five

Its disadvantage is the impossibility of obtaining a good quality sprayed material, its electrophysical characteristics differ from the optimum .10.

The purpose of the invention is to improve the quality of spraying materials.

This goal is achieved by

5 that in the head for spraying materials, comprising a housing, a drive shaft mounted therein with a channel for feeding the spraying material, a spraying device fixed thereto

20 nozzle, concentrically covering its nozzle, forming an annular gap with the nozzle, and a source of compressed gas, at the exit the outer surface of the force "and the inner surface of the nozzle are made with flanges placed one above the other parallel and having coaxially located along the perimeter of the flanges of the hole, the axis of which inclined to the axis of rotation

Claims (2)

30 nozzles. FIG. 1 shows a spray head for materials, a general view; in fig. 2 — node 1 in FIG. 1 (enlarged The head for spraying materials comprises a housing 1 mounted in it — a drive shaft 2 with a channel 3 for supplying a material to be sprayed, connected to the drive mechanism 4. In addition, the head contains a spray nozzle 5 mounted on the shaft 2 concentrically covering the nozzle 6, forming an annular gap with the nozzle 5, and a source of compressed gas (not shown) with fitting 7. At the outlet, the outer surface of the nozzle 5 and the inner surface of the nozzle are made with flanges 8 placed one above the other in parallel and The holes 9 located along the perimeter of the flanges 8, the axis of which is inclined to the axis of rotation of the nozzle VIA 5. The head for spraying materials works as follows. The material along the channel 3 of the shaft 2 goes to the spray nozzle 5, which, together with the shaft 2, rotates from drive mechanism 4. As a result, for example, electrostatic spraying, a painting torch is formed. Compressed gas through nozzle 7 enters nozzle b and through holes 9 on flanges 8, exit through an annular gap formed by edges of nozzle 5 and nozzle b, f rmiru gas curtain acting on the Kel f spraying, increasing the velocity of the particles which penetrate into shielded areas. Since the holes 9 in the flange 8 of the nozzle 5 perform rotational movements relative to the fixed flange 8 of the nozzle 6 with holes 9, when the compressed gas passes through the black hole 9, pressure drops are formed: the minimum at the time of coincidence of the holes and the maximum at the time of their closure. The pressure drop causes elastic oscillations of the nozzle 5, which contribute to a better dispersion of materials and a reduction in the size of the material particles. the frequency f of these oscillations is determined by the expression f nk, where n is the number of nozzle revolutions per second, the number of holes in one of the lanes. Under certain conditions, spraying can achieve ultrasound frequencies. So, for example, if on the flanges of 150 mm to make holes of 01.5 mm with a distance between them of 3 mm, then it is possible to fit 157 holes on each fan. Then the frequency of ultrasonic vibrations, for example at 17 kHz, can be achieved at 6480 rpm. ° MS.... R. Therefore, the proposed head allows to significantly improve the quality of spraying by obtaining elastic vibrations, and for this purpose, for example, an ultrasonic generator is not required. The arrangement of the holes at an angle to the axis of rotation of the nozzle will allow a more effective effect on the spray pattern, i.e. on the sprayed particles of the material. The proposed head is simple in design and can be applied, for example, in electric paint plants, which allows spraying materials that do not meet the requirements of electric paint with good quality. The invention includes a head for spraying materials, a housing, a drive shaft mounted therein with a feed channel for spraying material, a spray nozzle fixed thereto, concentrically covering the nozzle forming an annular gap with the nozzle, and a source of compressed gas that in order to improve the quality of spraying of materials, at the outlet the outer surface of the nozzle and the inner surface of the nozzle are made with flanges placed one above the other in parallel and having coaxial distributions false flange on the perimeter of the apertures, which is inclined to the axis of rotation of the nozzle axis. Sources of information taken into account in the examination 1.Vladygina EN and Goldberg M.M. Coloring products in the electric field. M., Himi, 1966, p. 165, fig. 2 2. Authors certificate of the USSR 144746, cl. B 05 B 5/00, 1961. (prototype).