JPH0116549B2 - - Google Patents

Abstract

1. Apparatus for atomizing liquids, using an unpressurized ultrasonic liquid atomizer (3) which is independent of position, and is installed in an outer housing and around which air flows on all sides, characterised in that, for the continuous regulation and focussing of the aerosol stream (9) which is moved by the air stream (1), there is arranged in the housing a speed-controlled fan (2) and, for the very fine regulation of the aerosol stream (9) which is produced by means of the ultrasonic atomizer (3) in an aerosol reservoir (4), there is arranged a shutter (10).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention incorporates into the outer casing a condition-independent, pressureless, ultrasonic liquid atomizer that is flushed from all directions by air. This invention relates to a device for spraying mist.

In the case of known atomizers, coarse adjustment of the atomizing performance is usually achieved by fitting a plurality of discharge nozzles of the same or different types. This principle is used, for example, in car carburetors.
Fine adjustments can be made by varying the atomizing pressure within a narrowly defined range. Ordinary mechanical atomizers do not allow adjustment of the water droplet delivery speed. Electromechanical atomizers allow for fine adjustment by varying the excitation voltage and excitation pulse, but not the required ratio of adjustment.

The methods currently used for applying dyeing liquids to special papers, for example in dyeing installations, also do not work satisfactorily, especially with regard to homogeneous distribution of the dyeing liquid. In the case of the roller method, the amount of liquid applied and the paper transport speed cannot be adjusted independently of each other. In another device, a rotary atomizer generates a water droplet-air mixture (erosol) under high pressure, which wets the paper by condensation. Due to the large heterogeneity and high dynamic energy (impingement effect) of this aerosol, non-uniform layers are applied with this method.

The purpose of the invention is to enable very high adjustment ratios and aerosol delivery speeds to the atomizing performance when atomizing liquids, especially industrial and medical liquids, and to ensure a homogeneous distribution of the liquid in a layer of uniform thickness. The goal is to create a liquid atomizing device that provides the following.

According to the invention, this purpose is achieved in the aerosol chamber using an ultrasonic atomizer and a speed-controlled fan for continuous adjustment and focusing of the aerosol flow moved by the air stream. This is accomplished by providing a restriction within the casing to finely adjust the aerosol flow.

With the liquid atomizing device according to the invention, the highest adjustment ratios, for example a ratio of 1:20, are achieved even when the operating voltage and the atomizing performance are constant.
By means of a speed-controlled fan and a mechanical diaphragm, the aerosol flow generated by the atomizer in the aerosol chamber is continuously adjusted with respect to the atomizing performance and the conveyance speed of the air stream, and the flow at the diaphragm aperture is adjusted accordingly. If the position is correct, the focus will be adjusted.
The pressureless ultrasonic atomizer does not create overpressure in the aerosol chamber compared to the discharge nozzle atomizer, so the minimum liquid volume of fine droplets is generated and the conveyance speed can be finely adjusted in a given direction. It can be shipped by Depending on the configuration of the device, the conveying air stream is directed perpendicular to the droplet generation or, if the oscillator is flushed at the same time, parallel to the droplet generation. The speed of the airflow is matched to the aperture of the diaphragm by electrical speed regulation of the fan. In the case of the device according to the invention, the liquid droplets condensing in the aerosol chamber are collected in a liquid reservoir and fed back to the atomizer via a pump in the external liquid tank or directly.

According to a particularly advantageous embodiment of the invention, the inner chamber of the aerosol chamber through which the aerosol flows is additionally provided with an intermediate wall, on which the condensation of large droplets parallelizes the selective action of gravity. A mistake is made.

Particularly suitable are the ultrasonic liquid atomizers according to Japanese Patent Publication No. 53-18158 and German Patent No. 2308584. The combination of such a pressure-free ultrasonic liquid atomizer and an aerosol chamber according to the invention makes it possible to generate a minimum amount of aerosol compared to a discharge nozzle atomizer, in which case the aerosol is It can be shipped in any direction at an arbitrarily adjustable conveyance speed. At the same time, the amount of aerosol and the density of the aerosol can be continuously fine-tuned.

With the device according to the invention any liquid can be atomized, such as water, emulsions, medical liquids, developer solutions, fuel oils and benzene. The amount of liquid atomized in the aerosol chamber and the diameter of the droplets generated are adapted to the conditions of use by varying the excitation voltage, excitation pulse and metering of the atomization performance.

The present invention will be described in detail below based on embodiments shown in the drawings.

The drawing shows a cross-sectional side view of a liquid atomizing device according to the invention. Air stream 1 is directed by fan 2 to plate 11 of atomizer 3. Liquid storage tank 6
The liquid present therein is sucked out by the pump 5 and led to the liquid atomizer 3 via the liquid supply pipe 7.
The droplets generated on the plate 11 come into contact with the air stream 1 in the aerosol chamber 4, producing an aerosol stream 9. The aerosol stream 9 is finely adjusted by means of an aperture 10, focused and rotated in the desired direction towards the object 12 to be coated. The interior space of the aerosol chamber 4 through which the aerosol flows is additionally provided with an intermediate wall 13 . A better selection of droplets is thereby achieved.

[Brief explanation of drawings]

The drawing is a sectional view of a liquid atomizing device according to the invention. 1...Air flow, 2...Fan, 3...Mist sprayer, 4...Erosol chamber, 5...Pump, 10...
...Aperture, 13...Intermediate wall.

Claims (1)

[Claims] 1. Washed away by air from all directions;
In an apparatus for atomizing liquids, a state-independent, pressureless, ultrasonic liquid atomizer is integrated into the outer casing, in which a continuous stream of aerosols 9 is moved by an air stream 1. A fan 2 whose rotation speed is controlled for adjustment and focusing, and an aperture 10 for finely adjusting the aerosol flow 9 generated in the aerosol chamber 4 using the ultrasonic atomizer 3 are provided in the casing. A liquid atomizing device featuring: 2. The device according to claim 1, characterized in that an intermediate wall 13 is provided inside the aerosol chamber 4.