SU150490A1 - Ultrasonic nozzle for spraying liquids - Google Patents

Description

A device is known that uses ultrasonic vibrations to intensify the spraying of liquids, consisting of a magnetostrictive cylindrical concentrator, a centrifugal film former and a special nozzle. However, this device does not provide a uniform spray of high density.

The proposed ultrasonic nozzle differs from the known ones in that the magnetostrictive emitter and the concentrator are made in the form of rings covering the collector pipes. By this design, a more uniform spray of increased density is obtained.

General view of the proposed ultrasonic nozzle shown in the drawing.

The nozzle consists of an annular magnetostrictive radiator 1, wound from a nickel (or permendyurovoy) tape. Along the radiator at a certain distance, the grooves 2 for the excitation winding 3 are profiled. A half-wave tubular concentrator 4 is transferred to the radiator, which passes into a thin-walled cylindrical shell. The inner diameter of the concentrator is of a constant size, and the outer diameter varies according to a certain law. From the outer and inner sides, the concentrator has annular tides 5 for fastening the entire oscillatory system in the massive flange 6 and for fastening the pipe 7, in the upper part of which the centering ring 8 is pressed, having a circumference of holes and a thread in the center for screwing the pipe 9 - Pipes 7 and 9 in the Bottom part have conically extending areas-diffusers 10. When screwing the pipe 9 into the ring 8 between the diffusers, an annular gap is formed, the value of which can be adjusted to 150490-2. A tee // is screwed onto the tube 7 from above to introduce the fluid into the annular space. The magnetostrictive radiator and the upper half of the concentrator are covered by a cover J2, in the lower part of which there is a nozzle 13 for supplying water to the radiator. The distribution of cooling water inside the case. This is accomplished with the aid of a pipe 14 which has a nozzle 75 for the discharge of water. Seals 16 and 17 prevent leakage of sprayed and cooling water from the nozzle.

The excitation of intense radial oscillations in the thin-walled shell of the ultrasonic concentrator is achieved under the condition that the frequencies of the magnetostrictive radiator and the radial oscillations of the shell are equal;

f WP / - °) 3-ifd

I dan

where E is the modulus of elasticity g-;

V cm I

p is the density of the material of the concentrator (g / cm);

and - Punch coefficient;

d is the diameter of the thin-walled section of the concentrator (cm).

The liquid going to the spray, is fed into the nozzle through the tee, // passes through the annulus and flows out of the annular gap formed by the diffusers 10.

The resulting annular film of liquid, moving at a certain speed, is directed at an angle to the inner surface of the concentrator, reaching which the film is dispersed by radial vibrations excited in the shell.

To prevent aggregation of the formed droplets and to obtain the required spray, air or gas is continuously supplied through the tube 9. At the entrance to the diffuser, the flow expands and — the energy of the moving air or gas is transferred to pressure energy, which contributes to the uniform blowing of the formed droplets from the nozzle, creating a torch with the same spray density.

The irrigation density of the proposed ultrasonic nozzle can be adjusted during operation by increasing the flow rate of fluid from the annular gap while simultaneously increasing the air flow rate.

At high rates of flow, the liquid film does not have time to disperse at the point of contact with the concentrator, therefore, slippery further along the working surface, it is dispersed in subsequent sections of the thin-walled shell, creating a high spray density.

Subject invention

An ultrasonic nozzle including a magnetostriction emitter, a concentrator and a collector made in the form of two concentrically arranged tubes, characterized in that, in order to obtain a more uniform spray of increased density, the magnetostriction emitter and concentrator are made in the form of rings covering the collector tubes.

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