RU30628U1 - Device for ultrasonic atomization of liquid media - Google Patents

Description

Device for ultrasonic atomization of liquid media.

The utility model relates to the technology of ultrasonic atomization of liquid media and can be used to create a comfortable aesthetic state of the air in residential and office buildings, to neutralize viruses and bacteria in crowded places (child care facilities, schools, universities, libraries, shops, restaurants , hospitals, etc.).

A device for ultrasonic atomization of liquid media. Patent of the Russian Federation No. 2152829, IPC7 V 05 V 17/06, publ. 07/20/2000, selected as a prototype, containing; its generator of electrical vibrations, consisting of an amplifying element and a basic oscillatory circuit connected by a positive feedback circuit, and a liquid evaporator with a piezoelectric element in acoustic contact with the evaporated liquid. A piezoelectric element of a liquid evaporator is used as a basic oscillatory circuit of the generator, forming coupled oscillatory circuits with the sprayed liquid, the joint resonant characteristic of which sets the oscillation mode of the generator.

The disadvantage of this device is the uncertainty of its specific design.

The objective of the utility model is to create a simple and effective design of a device for ultrasonic atomization of liquid media with high dispersion at minimum weight and size parameters.

The problem is solved due to the fact that in the device for ultrasonic atomization of liquid media, as well as in the prototype, it contains an electric oscillation generator, consisting of a positive feedback loop connected to an amplifying element and a piezoelectric element of a liquid evaporator in acoustic contact with the sprayed liquid and generating related

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oscillatory circuits, the joint resonant characteristic of which determines the oscillation mode of the generator, according to the utility model, a circuit containing a piezoelectric element connected between the base and the collector of the transistor, a first capacitor connected between the collector and the emitter of this transistor, and a second capacitor included between the base and emitter of the transistor, while the piezoelectric element is shunted by the first resistor, and the second resistor is connected between the base of the transistor and the third a source connected to the transistor’s emitter circuit and shunted by a third capacitor, the third resistor connected through the inductor to the first output of the power supply, the second output of which is connected to the collector of the transistor, forming a common point in the circuit, in addition, the outputs of the power supply are shunted by the fourth capacitor, and the fifth capacitor is connected to the third capacitor, which is connected to a common point of the first and second diode, while the first diode, fourth resistor and LED are connected in series ezhdu fifth capacitor and circuit common point, and the fourth resistor and LED zaschuntirovany schestym condenser, said second diode connected to the common point of the circuit.

In this device, the sprayed liquid is applied directly to the surface of the piezoelectric element. The generation of electrical oscillations occurs due to the inclusion of a piezoelectric element between the collector and the base of the transistor, and the first and second capacitors, respectively, between the collector and emitter, base and emitter. These capacitors form a positive feedback circuit. The desired ratio of capacitor capacities creates a condition for the excitation of oscillations. The self-oscillation frequency is lower than the resonant frequency of the piezoelectric element due to the feedback circuit. Electrical vibrations due to the piezoelectric effect excite the mechanical vibrations of the piezoelectric element, which create acoustic vibrations in the evaporated

liquids. The choice of piezoelectric element and feedback capacitors allows you to work at the characteristic frequencies of liquid atomization.

The proposed device is simple in design and has small overall dimensions. With its help, fine dispersion of various liquid media (aromatic and medicinal substances on water, alcohol and oil bases) is possible to create a comfortable aesthetic state of the air environment, the destruction of harmful bacteria and viruses in residential and office buildings, various places of crowded people.

In FIG. 1 shows an electrical diagram of a device for ultrasonic atomization of liquid media.

The device contains a piezoelectric element 1 connected between the base and the collector of transistor 2, a first capacitor 3 connected between the collector and the emitter of transistor 2, a second capacitor 4 connected between the base and the emitter of transistor 2. The first resistor 5, shunted by the third capacitor, is included in the emitter transistor 2 circuit. 6. The piezoelectric element 1 is shunted by the second resistor 7. The third resistor 8 is connected between the base of the transistor 2 and the first resistor 5, which is connected through the inductor 9 to the first output of the power supply 10. The second od power supply 10 is connected to the collector of transistor 2 and forms a common point of the circuit. The outputs of the power supply 10 are shunted by the fourth capacitor 11. A fifth capacitor 12 is connected in series to the third capacitor 6, which is connected to the common point of the first 13 and second 14 diodes by a different terminal, respectively. The first diode 13, the fourth resistor 15 and the LED 16 connected in series are connected to a common point in the circuit. The fourth resistor 15 and the LED 16 are bridged by the sixth capacitor 17. The second diode 14 is connected to a common point in the circuit.

A piezoceramic element was selected as a piezoelectric element 1, and any standard voltage source of 12 ± 2 V can be used as a power supply unit 10.

The DC voltage from the power supply 10 is supplied through the inductor 9 and the first resistor 5 to the emitter of the transistor 2. A direct voltage is generated between the emitter and the collector of the transistor 2. Through resistors 7, 8 and transistor 2, direct current flows. At the first resistor 5, a DC negative feedback voltage is generated that stabilizes the operating point of transistor 2 on the current-voltage characteristic. The third capacitor 6 filters out the alternating current, and transistor 2 is ready to excite oscillations. Elements 1-4 form a self-oscillator circuit, where capacitors 3 and 4 create positive feedback. The condition for the excitation of oscillations: the capacitance of the capacitor 4 is greater than the capacitance of the capacitor 3. High-frequency oscillations are excited between the collector and the emitter of transistor 2. The self-oscillation frequency is lower than the resonant frequency of the emitter - the piezoelectric element 1 due to its shunting by the capacitors 3 and 4. The inductor 9 and the fourth capacitor 11 form a low-pass filter that impedes the passage of high-frequency oscillations to the power source 10. Part of the high-frequency energy limited by the fifth capacitor 12 is transmitted to the rectification circuit, consisting of a diode 14 and 13, a sixth capacitor 17. The rectified voltage at the sixth capacitor 17 is through a current-limiting one; the fourth fourth resistor 15 is recorded by LED 16, the radiation of which It indicates that the appliance is operational. A few drops of aromatic substances are applied to the piezoelectric element 1 on an aqueous, alcoholic or oil base (essential oils or other liquid medicinal substances). Under the influence of ultrasonic vibrations that are formed on the piezoelectric element 1, finely dispersed fractions are sprayed into the air. Use of such

resonant spraying of liquid media activates their biological structures by exciting the surface of an aerosol drop. The proposed design of a device for ultrasonic atomization of liquid media allows to obtain fine aerosols with a particle diameter of 0.3 - 0.5 microns, including viscous liquids (pure essential oils) that are in the air for 18-20 hours. The device operates at a frequency of 2.64 MHz authorized by the Ministry of Health of the Russian Federation. The device is compact (no more than a computer mouse), has a mass of not more than 350 g, is simple to use.

Claims (1)

A device for ultrasonic spraying of liquid media, containing an electric oscillation generator, consisting of a positive feedback loop coupled to an amplifying element and a piezoelectric element of a liquid evaporator in acoustic contact with the liquid being sprayed and forming associated vibrational circuits, the joint resonant characteristic of which sets the oscillation mode of the generator, characterized in that as a generator of electrical oscillations, a circuit containing a piezoelectric element, VK connected between the base and the collector of the transistor, the first capacitor connected between the collector and the emitter of this transistor, the second capacitor connected between the base and the emitter of the transistor, while the piezoelectric element is shunted by the first resistor, and the second resistor is connected between the base of the transistor and the third resistor, which is connected to the circuit transistor emitter, and is shunted by a third capacitor, and the third resistor is connected through the inductor to the first output of the power supply, the second output of which is connected to the collector the transistor, forming a common point in the circuit, in addition, the outputs of the power supply are shunted by the fourth capacitor, and the fifth capacitor is connected to the third capacitor, which is connected to the common point of the first and second diodes, while the first diode, fourth resistor and LED are connected in series between the fifth capacitor and a common point of the circuit, and the fourth resistor and LED are shunted by the sixth capacitor, and the second diode is connected to a common point of the circuit.