SU1388104A1 - Arrangement for making flows of calibrated drops - Google Patents

Abstract

The invention relates to devices for generating monodisperse droplets and can be used in aerosol labeling, soldering, microdosing and other areas of science and technology where a controlled aerosol jet is required. The goal is to simplify the operation of the device and expand the area of its application by making it possible to change the direction of the resulting droplet streams. For this purpose, in a device for receiving flows of calibrated droplets, comprising a chamber for a liquid, connected to a constant pressure source of liquid, and an element in it connected to a source of vibrations, the bottom of the chamber is made of an elastic material. To reduce the deflection of the elastic bottom at high pressures in the chamber, the bottom is pressed by a rigid perforated plate. Capillaries are passed through the bottom in the centers of the perforations. Their adjustable angular deviation, leading to a change in the direction of the droplet flows emerging from them, is carried out by means of drags, one ends of which are fixed on the output ends of the capillaries, while others are moved by micrometric screws. Зз. n, f-ly, 1 ill. i (L

Description

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The invention relates to devices for generating monodisperse droplets and can be used in aerosol marking, soldering, microdosing techniques, for controlling the flow of droplets of a given dispersion, density and frequency when testing materials and samples for erosion strength, as well as in other fields of science and equipment that requires controlled aerosol jet.

The purpose of the invention is to simplify the operation of the device and expand the area of its application by making it possible to change the direction of the resulting droplet flows, reducing the bottom deflection at high pressures in the chamber.

The drawing shows a device for obtaining flows of calibrated droplets, a general view.

The device comprises a liquid chamber 1 connected by a pipe 2 to a source (not shown) of a constant fluid pressure, an element 3 placed in the chamber, connected to a source of oscillations (not shown), and capillaries 4 passed through the bottom 5 of the chamber 1 s. possibility of longitudinal movement.

The bottom 5 of the chamber 1 is made of an elastic material, such as vacuum rubber, and the capillaries 4 are installed with the possibility of angular deflection.

In addition, the device is equipped with a rigid perforated plate 6 with a hole 7, pressing the bottom 5 to the end of the camera 1 and made in the form of a cap nut.

The thickness h of the bottom 5 and the radius g of the perforation hole of the plate 6 are chosen from the following relations

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J / 16E

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angle from

where ® is the largest required

capillary slope; k - coefficient characterizing the allowable deflection of the bottom; X is the maximum allowable longitudinal displacement of the bottom; E is the modulus of elasticity of the material of the bottom;

b - Poisson's ratio of the bottom material;

P is the specified overpressure in the chamber.

The device has a device for adjusting the angular deviation of the capillaries 4, made in the form of mechanical tubes 8, one ends of which are fixed on the output ends of the capillaries 4, while others are connected with micrometric screws 9 fixed on the walls of chamber 1.

The device works as follows.

Liquid from a constant pressure source enters chamber 1 through nipple 2

five

0

0

five

and at a constant rate it flows out of the capillaries 4 in the form of jets. From the oscillating element 3 through the liquid in the chamber 1, longitudinal oscillations are transmitted to these jets, the development of which in the jet leads to the disintegration of the latter at some distance from the output end of the capillary to the flow of monodisperse droplets.

The desired direction of the resulting droplet flows is established by the angular deviation of the capillaries 4 when moving the mechanical tubes with 8 micrometer screws 9.

The device is characterized by simplicity, smoothness and accuracy in changing the direction of the resulting droplet streams. There is no backlash when adjusting and no need to mount the capillary after an angular deflection. Within certain limits of adjustment, the resonance characteristics of the device operation modes do not change. The change of direction is possible within the entire solid angle. The adjustment unit is small in size, and the device itself for receiving flows of calibrated droplets can be fixed permanently, which is more convenient for connecting supply lines of hydraulics and power engineering.

Claims (4)

1. A device for obtaining flows of calibrated droplets, comprising a chamber for a liquid, connected to a constant pressure source of liquid, placed in the chamber an element connected to an oscillation source, and capillaries passed through the bottom of the chamber with the possibility of longitudinal movement, characterized by that, in order to simplify the operation of the device and expand its area of application by providing the possibility of changing the direction of the resulting droplet flows, the bottom of the chamber is made of an elastic material, and the capillaries installed with the possibility of angular deflection. 2. The device according to claim. Characterized in that the bottom is made of vacuum rubber. 3. The device according to claim 1, characterized in that, in order to reduce the bottom deflection at high pressures in the chamber, it is provided with a rigid perforated plate, the bottom thickness and the radius of the perforation hole of the plate being selected from the following ratios5 0 five . 0 g, / I6E, g / V 4ir-6 -) P g e h - bottom thickness; g - the radius of the perforation hole; € is the largest required deflection angle; k - coefficient characterizing the allowable deflection of the bottom; X - the maximum allowable longitudinal displacement of the bottom; E is the modulus of elasticity of the material of the bottom; e is the Poisson’s ratio of material bottoms; P - given excess pressure in the camera. 4. The device according to claim 1, characterized in that it is provided with a device for controlling the angular deviation of the capillaries, made in the form of mechanical bars, one ends of which are fixed on the output ends of the capillaries, while others are connected with micrometric screws fixed on the walls cameras.