SU172206A1 - PNEUMATIC GUN-SPRAYER FOR VISCOUS LIQUIDS, PAINTS AND PASTES - Google Patents

Description

Pneumatic spray guns for viscous liquids, paints and crust are known, having a compressed air supply chamber and a spray head mounted on it with a tangentially mounted nozzle for the delivery of sprayed liquid.

The proposed pneumatic pistol improves the quality of de-scaling of viscous and contaminated fluids.

This is achieved by making the compressed air supply chamber of a pneumatic gun in the form of a whirling whistle with a tangential swirler, whereby the liquid to be sprayed is preliminarily formed into a film and then crushed under the action of acoustic oscillations in a rotating air flow.

The drawing shows schematically an air gun.

The pneumatic spray gun has a chamber / compressed air supply, at one end of which the spray head 2 is fitted, and the other is closed by a plug 3. A fitting 4 with a tank 5 is tangentially mounted on the displacement head for supplying the sprayed liquid.

The cavity of the compressed air supply chamber is made in the form of a whirling whistle with a tangential swirler and has two cylinders 6 and 7, respectively, of a larger diameter and

smaller socketer. Compressed air into the chamber is supplied tangentially through pipe 8. The spray head is fixed on the chamber of compressed air supply with screw 9. 5 Compressed air is introduced through pipe 8 tangentially into cylindrical chamber 6 of larger diameter and as a result receives rotational motion.

During the movement of air flow from cylinder 6 to cylinder 7, the speed of air rotation increases according to the law of conservation of the moment of momentum. When the air leaves the small cylinder 7, a sound arises, the frequency and intensity of which change with a change in the air pressure at the inlet to the spray head 2; the air flow at this, continuing to rotate, takes the form of a cone. The liquid paint from the tank 5 to the spray head 2 through the fitting 4 also enters tangentially, and due to the centrifugal force resulting from the movement of the liquid, and due to the rotation and rotation of the air flow, it expands into an annular

5 film.

To increase the injection capacity of the spray head and the whistle chamber of the compressed air supply external to the end of the chamber (whistle) W

Agents have curvilinear profiles that form between them an annular gap 12 of variable cross section, decreasing towards the exit of the spray head.

Optimum injection conditions are selected by axial movement of the spray head relative to the compressed air supply chamber.

At the outlet of the sprayer, two streams meet: liquid in the form of an annular film and pulsating air in the form of an opening cone. In this case, favorable conditions are provided for uniform distribution of air flow over the cross section of the annular film of the liquid and creating maximum friction forces due to the development of the surface.

The presence of strong initial high frequency disturbances that propagate

along the surface of the liquid film in the form of BOvTH, contributes to uniform crushing of the film on fine kayli, thereby ensuring uniform spraying.

Subject invention

A pneumatic spray gun for viscous liquids, paints and pastes, having a compressed air supply chamber and a spray head mounted on it, on which a fitting for supplying a sprayed fluid is tangentially installed, characterized in that, in order to spray viscous and polluted liquids of high quality, his compressed air chamber is designed as a whirling whistle with a tangential swirler.

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