RU2254934C1 - Ultrasound aerosol generator - Google Patents

Abstract

FIELD: apparatus for spraying or atomizing liquids or other fluent materials, particularly in medicine and sanitation for inhalation therapy, room moistening and disinfection.

SUBSTANCE: ultrasound aerosol generator comprises aerosol chamber composed of upper and lower parts and ultrasonic transducer installed in lower chamber part. Ultrasonic transducer is also used as container for working liquid. Piezoelectric ultrasound emitter is sealed in transducer bottom. Air inlet orifice provided with fan is formed in side wall or bottom of lower chamber part. Supplying device used to maintain necessary level in transducer cup is arranged in upper chamber part. Aerosol discharge channel is located above the transducer and arranged coaxial thereto. Aerosol discharge channel is formed as a tube with end located above working liquid level. Generator created aerosol particles having dimensions of 0.1 - 10 mcm.

EFFECT: possibility to obtain fine aerosol particles, provision of practically laminar aerosol flow and full discharge thereof due to recombination processes elimination, namely due to prevention of fine aerosol particles conversion into large ones by conglutination thereof.

4 cl, 1 dwg

Description

The invention relates to the field of medicine and sanitation and can be used both medicinally for inhalation therapy, and for humidification and disinfection of premises.

Known accepted by the authors for the prototype ultrasonic aerosol generator containing an aerosol chamber consisting of upper and lower parts, while the lower part is equipped with an ultrasonic transducer, and there is also an inlet for air supply, equipped with a fan, in the upper part there is a liquid feeding device and exit channel for aerosol (1).

The disadvantage of this device is the design complexity for the production and delivery to the consumer of a mixture of aerosol working fluid and air. The tangential air supply to the aerosol chamber reduces the amount of aerosol carried out. In a swirling (turbulent) air stream, the produced fine aerosol sticks together into larger droplets (up to 300 microns), which reduces its quality.

The purpose of the invention is to increase productivity while simplifying the design, improving the quality of the aerosol by providing a laminar flow, reducing the likelihood of small particles sticking together into larger particles, increasing the duration of continuous operation and expanding the scope of the device.

This goal is achieved by the fact that in the ultrasonic aerosol generator containing an aerosol chamber, consisting of upper and lower parts, while the lower part is equipped with an ultrasonic transducer, and there is also an inlet for air supply, equipped with a fan, in the upper part there is a feeding device for liquid and an outlet channel for aerosol, an ultrasonic transducer is made in the form of a cylindrical cup serving simultaneously as a container for the working fluid, the bottom of which is tight o fixed ultrasonic emitter, which is a piezoelectric element having the shape of a hemisphere segment, the channel for the exit of the aerosol is made in the form of a pipe located vertically above the ultrasonic emitter and coaxially with it.

An air inlet provided with a fan may be located in the side wall or in the bottom of the lower part of the aerosol chamber.

In the embodiment of the ultrasonic generator, the aerosol chamber may contain several acoustic transducers installed in the lower part of the chamber, while for all transducers or for individual groups a common opening for the exit of the aerosol is provided.

The invention is illustrated in the drawing, which shows a vertical section of the inventive device.

The aerosol chamber consists of upper 1 and lower 2 parts.

An ultrasonic transducer 3 is located in the lower part 2, which at the same time serves as a container for the working fluid 4. A piezoelectric ultrasonic transducer 5 is sealed in the bottom of the transducer 3. There is an air inlet 6 in the side wall or in the bottom (not shown) of the aerosol chamber, equipped with a fan 7.

In the upper part 1 of the aerosol chamber there is a feeding device consisting of a sealed container 8 and a piping system 9 and serving to maintain the necessary level of the working fluid 4 in the glass of the transducer 3. Above the transducer 3 and coaxially with it there is a channel 10 for aerosol exit, made in the form pipes whose cut is located above the level of the working fluid.

The device operates as follows.

From an electric generator (not shown) a signal of a certain frequency is fed to a piezoelectric emitter 5. In this case, the electrical signals are converted into mechanical vibrations of the ultrasonic frequency, which, due to the spherical shape of the emitter 5, are focused at one point 11. The position of this point determines the level of the working fluid 4 supported by the feed device 8, 9.

Under the influence of ultrasonic vibrations in the zone of point 11, a column of working fluid 12 is formed, from the surface of which aerosol 13 is released due to cavitation processes. With constant supply of air by the fan 7 through the inlet 6, the air is mixed with the aerosol and carried out through channel 10.

This device allows to obtain a finely divided aerosol structure with a particle diameter of 0.1 to 10 μm, and the use of a transducer in the form of a glass and an outlet channel in the form of a pipe in the aerosol chamber in combination with the optimal location of the air inlet equipped with a fan makes it possible to create a close to laminar flow of aerosol and its almost complete removal by minimizing recombination processes, i.e. the reverse process of converting small aerosol particles to larger ones due to their sticking together.

The invention can be widely used in medicine (for inhalation, in halochambers), in disinfection, as humidifiers, including in agriculture (in the production of berries, mushrooms).

Sourse of information

1. US patent No. 4159803, M. cl. B 05 B 017/06, 1979

Claims (4)

1. An ultrasonic aerosol generator containing an aerosol chamber consisting of upper and lower parts, while an ultrasonic transducer is installed in the lower part, and there is also an inlet for air supply, equipped with a fan, in the upper part there is a liquid feeding device and an outlet channel for aerosol, characterized in that the ultrasonic transducer is made in the form of a cylindrical cup serving simultaneously as a container for the working fluid, in the bottom of which is ul an ultrasonic emitter, which is a piezoelectric element having the shape of a hemisphere segment, the aerosol exit channel is made in the form of a pipe located vertically above and coaxially with the ultrasonic emitter. 2. The ultrasonic aerosol generator according to claim 1, characterized in that the inlet for air supply, equipped with a fan, is located in the side wall of the lower part of the aerosol chamber. 3. The ultrasonic aerosol generator according to claim 1, characterized in that the inlet for air supply, equipped with a fan, is located in the bottom of the lower part of the aerosol chamber. 4. The ultrasonic aerosol generator according to one of claims 1 to 3, characterized in that the aerosol chamber contains several acoustic transducers installed in the lower part of the chamber, while for all transducers or for individual groups, a common outlet for the exit of the aerosol is provided.