SU1346265A1 - Nozzle for atomizing liquid - Google Patents

Abstract

The invention relates to the spraying of liquids and can be used for washing the surface. The goal is to increase the efficiency and cost-effectiveness of the nozzle when washing surfaces and simplifying the design. For this purpose, in the nozzle for spraying liquid, the gas distribution device is made in the form of a wing with a curvilinear symmetric profile, installed with the possibility of oscillatory motion under the action of the current of the spraying agent around an axis located in the outlet part of the chamber. In the nozzle, there is a uniform movement of the spraying agent from top to bottom and back over the entire irrigation plane. 2 nl.

Description

The invention relates to mechanical engineering and can be used in liquid dispensing devices in which liquid under pressure is fed into the flow of the expanding agent and can be used to wash surfaces, such as printed circuit boards after etching, and surfaces before painting. materials.

The purpose of the invention is to increase the efficiency and cost-effectiveness of the nozzle operation in case of the removal of surfaces and to simplify the design.

FIG. 1 shows a fluid atomizing nozzle; a slit; in fig. 2 shows section A-A in FIG. one.

The nozzle for spraying a fluid includes a housing with chamber 2 therein and outlet 3 placed in chamber 2 by means of fluid supply 4 with lower and upper perforations 5 and 6 and the source 1: from the flow of sawing agent (not shown) Furthermore, the nozzle contains a device gas distribution, which is made in the form of a wing 7 with a curvilinear symmetric profile, installed with the possibility of oscillatory movement under the action of a stream of spraying agent around the axis 8, located in the outlet part of the chamber 2 dicular midline wing profile 7.

The chamber 2 has a narrowing in the upper 9 and lower 10 points, as well as a narrowing formed by the upper 11 and lower 12 forming the output opening 3. Between the housing 1 and the fluid supply means 4 there are the upper 13 and lower 14 channel along which the spraying moves 1st agent depending on the position of 7,

The spray nozzle operates as follows.

In the initial state, when the spraying agent is not let down, the wing 7 under the pressure of the moment relative to the rotation axis 8 from its own gravity takes the position shown in FIG. 1. This is due to 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 acts in the direction of rotation clockwise, therefore the wing 7 of the lower generatrix rests on the lower

point 10 of the narrowed section of chamber 2, covering with its stern a passage through the lower channel 14. In this position, the middle line of the wing profile 7 forms the longitudinal axis of the nozzle, or the same with the direction of movement of the spraying agent, angle b1, called the angle of attack.

When supplying the spraying agent, the latter passes through the upper part of the wing 7, then in the channel 13 between the housing 1 and the means 4 and the liquid discharged from the upper row of perforation 6 of the means 4 is directed to the outlet 3, since the passage 14 is much smaller than the spraying agent due to its covering by the aft part of the wing 7, then the direction of flow after the outlet 3 is determined by the direction of the generatrix 11.

At the same time, when the spraying agent is supplied due to the angle, fli, an asymmetrical flow 7 of the wing 7 with this agent takes place. As a result, the speed of the agent above the wing 7 is greater than the speed of the agent under the wing 7. Therefore, according to Bernoulli’s law, the pressure above the wing is lower and under the wing more. Under the action of this pressure difference, N.E. Zhukovsky rav on

I Vn, where p is the density of the spray

h, 3

agent, kg / m;

V is the velocity of the spraying agent incident on the wing,

m / s 4G - circulating velocity around

wing - wing span in transverse

direction., m

This force is applied to the center of pressure of the wing 7j which, as well as its center of gravity, is located wa from the axis of rotation 8. However, the direction of this force is opposite to the direction of the force of gravity of the wing 7. Thus, on the wing 7 there are two moments of forces directed against each other. Upon reaching a certain value of the velocity of the spraying agent, the torque from the force of N.E. Zhukovsky exceeds the moment of the strength of the body. Wing 7 begins to rotate around axis 8 counterclockwise and approaches its upper generator to point 9.

Channel 13 closes the aft part of the wing 7, and channel 14 opens, the Spraying agent passes through channel 14 to the outlet 3, sprayed liquid coming out of the bottom row of perforation 5 of the tool 4. Now the direction of the flow after the outlet 3 is determined by the direction of the generatrix 12 ..

Thus, there is a uniform movement of the spraying agent from top to bottom and back over the entire irrigation plane, which makes this device more efficient from the point of view of removal of surfaces. Also, the device is substantially simpler, and the direct flow of the spraying agent inside the nozzle with small deviations of the direction of movement makes the device economical in terms of pressure losses.

15

As soon as the channel 13 is adhered by the wing 7, the flow pattern of the wing 7 is reversed. At the top of the wing 7, the flow pressure is greater than the bottom. Now the moment from the action of the difference of these pressures coincides with the moment of forces from the own force of gravity of the wing 7 and the wing 7 returns to its original state.

Further, the cycle repeats automatically and the wing 7 oscillates around the axis 8 as a pilot, 25 in it with a camera and an outlet.

20

Claims (1)

Invention Formula A nozzle for spraying a liquid, comprising a housing with directing the flow of the spraying agent to one, then to the other channels 13 and 14, thus creating an oscillating gas-liquid plume after the outlet 3. Between these two extreme positions of the wing 7 there is an intermediate one when its median line coincides with the axis of the nozzle, i.e. when the angle of attack is about O. In this short-term state, through which wing 7 is inertia moving to one of the two extreme positions, the flow is sprayed 3462654 The wing 7 flows symmetrically around the wing 7, and in equal quantities passes through channels 13 and 14, and in the outlet 3 the flow moves in a direct flow along the axis of the nozzle without deviations. Thus, there is a uniform movement of the spraying agent from top to bottom and back over the entire irrigation plane, which makes this device more efficient from the point of view of removal of surfaces. Also, the device is substantially simpler, and the direct flow of the spraying agent inside the nozzle with small deviations of the direction of movement makes the device economical in terms of pressure losses. 15 there is a camera and an outlet in it. Invention Formula A nozzle for spraying a liquid, comprising a housing with 0 five The fluid supply means located in the chamber, the source of the spraying agent stream and the gas distribution device, are characterized in that, in order to increase the efficiency and efficiency of the nozzle operation during the removal of surfaces and simplify the design, the gas distribution device is designed in the form of a wing with a curvilinear symmetric profile that is installed oscillatory movement under the action of the flow of the spraying agent around an axis located in the outlet part of the chamber. 12 Editor N. Bobkova Compiler A; I. Chal-Boryu Tehred M. KhodanychCorrector S.Cherni Order 5075/11 Circulation 645Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Design,