RU1780842C - Nozzle for spraying liquid - Google Patents

Abstract

Use: washing surfaces before painting. For coating with polymeric materials. SUMMARY OF THE INVENTION: in an injector for distributing a fluid, the angle between the axes of each row of openings of the fluid supply means is not equal to the angle between the axes of the openings of the fluid outlet of the gas distribution device. This embodiment of the nozzle makes it possible to increase the efficiency of spraying the liquid with a spray medium, which helps to increase the quality of the nozzle. 2 ill.

Description

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The invention relates to our 6th building and can be used in buildings for spraying liquids in which. liquid under the pressure of a spraying agent to wash the surfaces before staining and coating with polymeric materials.

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The known nozzle for spraying a liquid comprises a housing with a chamber therebetween and an outlet, a fluid supply means arranged in the chamber and a ra3opacrfp 4e5ie fi KҐf device located on the outside of the fluid and made in the form of a spiral with a curvilinear symmetrical profile installed with It is possible to carry out a fluid movement under the deed Uyed of the spraying agent around the liquid that has been laid down in the outlet part with the axis of the liquid medium, with holes for discharging liquid into the flow of the distribution lyvayuschego agent and CBD mbvoi portion housed in the outlet plane, the radii of curvature forming is chosen equal to the radius of curvature of the surface of the device of gas-and-op with pTeodSho Yai n (1).

Since the spraying agent washes the upper and lower rows of perforations periodically, the liquid is also sprayed with this agent periodically: precisely in the part where the spraying agent is currently passing. Thus, in the well-known nozzle, the liquid was not sprayed; it was sprayed with the spraying agent at the same time, but half of it.

The purpose of the invention is to increase the efficiency of the nozzle when washing surfaces. At the same time, spraying of all liquid at the same time is ensured.

The goal is achieved in that the angle between the axes of each row of holes

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the fluid supply means is not chosen equal to the angle between the axes of the fluid outlet of the gas distribution device;

In FIG. 1 shows a general view of the nozzle; in FIG. 2 is a section AA in FIG. 1.

The liquid spray nozzle comprises a housing 1 with a chamber 2 formed therein and an outlet 3, a fluid supply means 4 with lower and upper perforations 5 and 6 and a source of spray agent flow (not shown) located in the chamber 2.

In addition, the nozzle comprises a gas distribution device, which is made in the form of a wing 7 with a curvilinear symmetrical profile, mounted with the possibility of oscillatory movement under the action of the flow of the spraying agent around axis 8, combined with the axis of the fluid supply means 4.

The chamber 2 has a narrowing at the upper and lower points 9 and 10, between which the stern of the wing 7 oscillates.

These constrictions are formed by generators 11 and 12, the radii of curvature of which are equal to the radius of curvature of wing 7 in part of a curved symmetric profile. This embodiment of the flow part reduces the resistance to movement of the spray agent. In the body of the wing 7, upper and lower holes 13 and 14 are made for discharging liquid from the upper and lower perforations 5 and 6 of the means 4 for supplying liquid to the flow of the spraying agent when the exit edge of the wing 7 oscillates between points 9 and 10. At the same time, the body of the wing closes that p d perforations 5 and 6, over which at the moment there is no bulk spraying agent.

A nozzle for spraying a liquid operates as follows.

In the initial state, when the spraying agent is not let down, the wing 7, under the action of the moment relative to the axis of rotation 8 from its own gravity, occupies the position shown in FIG. 1. This is explained by the fact that the center of gravity of the wing 7 is located to the right of the axis of rotation 8, therefore, the moment of gravity of the wing 7 acts in the clockwise direction of rotation, therefore, the wing 7 of the stern rests on the lower point 10 of the narrowed section of the chamber 2, blocking the passage through the lower part of the outlet 3. Therefore, the direction of flow after the outlet 3 is determined by the direction of the generatrix 11. In this position, the wing 7 closes with its body the lower perforations 5 of the means 4 for supplying liquid to the spray stream

agent, and the upper perforations 6 are open. Through these upper perforations 6, the spray liquid enters the spray agent stream through the upper holes

13 wing 7, under the action of which there is a spray of liquid.

At the same time, when the spraying agent is supplied, due to the angle of attack of the flow on the wing 7, asymmetric

flow around wing 7 by this agent. As a result, the speed of the agent above wing 7 is greater than the speed of the agent under wing 7. According to Bernoulli’s law, pressure above the wing is less, and more under the wing. Under the influence

this pressure difference on the wing acts Zhukovsky lift force equal

Y / 3WFI,

where p is the density of the spraying agent, kg / m3;

W is the velocity of the spraying agent incident on the wing, m / s;

F — velocity circulation around the wing, m2 / s;

I - wing span in the transverse direction, m

This force is applied to the center of pressure of the wing 7, which is the same as its center

gravity, located to the right of the axis of rotation 8. In this case, the spraying agent atomizes the liquid supplied from the perforations 6 of the means 4, and the gas-liquid phase moves to the outlet 3, deviating

forming 11 down from the axis of the nozzle.

However, the direction of this force is opposite to the direction of gravity of wing 7. Thus, two moments of forces opposite each other act on wing 7

friend. Upon reaching a certain value of the velocity of the spraying agent, the Zhukovsky moment of force will exceed the gravity. The wing 7 will begin to rotate around axis 8 counterclockwise and approach its upper generatrix to point 9. The lower part of the outlet 3 will open, and the upper one will close and the flow along generatrix 12 will be directed upward from the nozzle axis, spraying the liquid leaving the lower a series of perforations 5 of the means 4. In this case, the wing 7 covers the upper perforations 6 with its body, blocking the access of the spraying agent — liquid through the opening 13 to the upper part of the nozzle, where the movement of the spraying agent by the wing body is stopped, namely erhney surface. /

Once the top of the outlet 3 is covered by the wing 7, the picture

the flow around the wing 7 is reversed. Above wing 7, the flow pressure is greater than from below. Now the moment of the difference in the forces of action of these pressures coincides with the moment of the own gravity of the wing 7 and the wing 7 returns to its original state.

Next, the cycle repeats automatically: cheeks, and wing 7 makes vibratory movements around the axis, such as directing the flow of the spraying agent up and down with respect to the axis of the nozzle, thus creating a vibrating gas-liquid torch after the outlet 3.

Between the extreme positions of wing 7 there is an intermediate when% PoTred

This embodiment of the nozzle makes it possible to increase the efficiency of spraying liquid with a spraying medium, which contributes to an increase in the quality of the nozzle.

Claims (1)

SUMMARY OF THE INVENTION A nozzle for spraying a liquid, comprising a housing with a chamber and an outlet therein, a fluid supply means and a gas distribution device located in the chamber, located on the outside of the fluid supply means and made in the form of a wing with a curved symmetrical profile, is installed - 15 with the possibility of oscillatory motions under the action of the flow of the sawing agent around an axis located in the outlet of the chamber and combined with the axis of the riot to supply the wait kbsty from the hole necessarily represent the axis affectation YTt7§.ugYa attacks. In this, for a short time, SosTb-20 mi to release the liquid into the spray stream, through which the wing 7 of the singing agent and with the stern, moves to one of the two extremes of the one located in the plane of the outlet side, the flow of the spraying element is symmetrical wing 7 flows smoothly and equally quantities passes on both sides of it, and 25 in the outlet 3, the flow moves versts, the radii of curvature of the generators of which are selected equal to the radius of curvature of the surface of the gas distribution device, characterized in that, in order to increase the efficiency of washing surfaces, the angle between the axes of each row of openings of the fluid supply means is not equal to the angle between the axes of the exhaust openings valve timing fluid. straight along the axis of the nozzle without deflection. In this intermediate position of wing 7, the lower and upper rows of perforations 5 and 6 of means 4 are also half open, and liquid is equally supplied to both streams of the spray agent. This embodiment of the nozzle makes it possible to increase the efficiency of spraying liquid with a spraying medium, which contributes to an increase in the quality of the nozzle. SUMMARY OF THE INVENTION A nozzle for spraying liquid, comprising a housing with a chamber and an outlet in it, a fluid supply means and a gas distribution device located in the chamber, located on the outside of the fluid supply means and made in the form of a wing with a curved symmetrical profile, mounted with the possibility of oscillatory motions under the action of the flow of the sawing agent around an axis located in the outlet of the chamber and combined with the axis of the riot for supplying iron ore with holes for OSCAL in fluid flow Spray versts, the radii of curvature of the generators of which are selected equal to the radius of curvature of the surface of the gas distribution device, characterized in that, in order to increase the efficiency of washing surfaces, the angle between the axes of each row of openings of the fluid supply means is not equal to the angle between the axes of the exhaust openings valve timing fluid. "YSHAY - w / Yu f2    .do &EEnMsGyZ; s FIG. g