JPS605346B2 - Ultrasonic atomizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic atomizer using a piezoelectric transformer, and its purpose is to obtain an ultrasonic atomizer that can efficiently atomize liquid with low electric power. It is something.

Conventionally, ultrasonic atomizers have generally used piezoelectric ceramic vibrators, but when using batteries as a power source, small and portable ultrasonic atomizers can be However, due to the design of the piezoelectric ceramic vibrator, it is difficult to efficiently atomize liquid with a small amount of electric power, and for this reason, it has not been put to practical use in a device using a battery as a power source.

The present invention focuses on the fact that mechanical vibration with a large amplitude can be obtained at the output end of a piezoelectric transformer with small electric power, and provides a new ultrasonic atomization device. Generally, piezoelectric transformers are
Although various types have been devised with different structures and electrode shapes, a piezoelectric transformer as shown in FIG. 1 is practically advantageous in terms of manufacturing and step-up ratio. In other words, as shown in FIG.
, 2' are formed by forming the output side electrode 3 on one end surface on the side where the electrodes 2' are not formed.

In FIG. 1, P represents the direction of polarization, the thickness direction is referred to as the drive section, and the length direction is referred to as the power generation section. This corresponds to the primary and secondary sides of a wire-wound transformer, and when a voltage V with a frequency equal to the natural resonance frequency of the piezoelectric transformer, which depends on the lengthwise dimension, is applied to the drive section, mechanical vibration occurs in the lengthwise direction. is generated, a charge is generated in the power generation section due to the piezoelectric effect, and an alternating high voltage y2 is obtained at the output end. That is, a piezoelectric transformer obtains a boost effect through the process of converting electrical energy into mechanical energy and back into electrical energy. FIG. 2 shows a specific example of an oscillation circuit that drives this piezoelectric transformer. In FIG. 2, 4 is a piezoelectric transformer, 5 is a DC power supply, 6 is a switch, 7 is a transistor, 8 is a diode, 9 is a transformer, 10 to 12 are capacitors, and 13 is a resistor.

Embodiments in which the ultrasonic atomization device of the present invention is used in a fragrance device will be described below with reference to FIGS. 3 to 7.

FIG. 3 shows a schematic configuration of an aromatic device according to an embodiment of the present invention, and as shown in FIG. A conical container 14 is placed on the output side electrode 3 of the piezoelectric transformer 4, which is constructed by forming the output side electrode 3 on one end surface of the side where the electrodes 2, 2' are not formed. The aromatic liquid 15 in the container 14 is atomized by oscillating the piezoelectric transformer 4 at an oscillation frequency of, for example, several tens of kilometres, using an oscillation circuit A as shown in FIG.

In FIG. 3, reference numeral 16 denotes a blower that sends out the atomized aromatic liquid 15 to the outside, and 17 denotes a tank that stores the aromatic liquid 15 dripped into the container 1 through a pipe 18. In addition,
Mechanical vibration can be obtained by oscillating the piezoelectric transformer 4, and a high voltage of several KV can be obtained from the output electrode 3. Therefore, if the container 14 is made of conductive material such as metal, the container 14
The high voltage of the piezoelectric transformer 4 will be released to the aromatic liquid 15 etc. through the air, which is dangerous. As a solution to this problem, the methods shown in FIGS. 4 to 6 can be considered.

The one shown in FIG. 4 has a part of the output end of the piezoelectric transformer 4 unpolarized, and a container 14 made of metal or the like is attached to this terminally polarized part, and the one shown in FIG. An insulator 19 is attached to a part of the output end of the transformer 4, and this insulator 1
A container 14 made of metal or the like is mounted on top of the container 9, and the one shown in FIG. 6 uses a container 14' made of an insulating material as the container 14.

In addition, in order to efficiently atomize the liquid such as the aromatic liquid 15, the container 2 has a conical shape with an exponentially curved side surface.
If 0 is used, there will be no vibration nodes in the container 20, and the liquid can be atomized more efficiently.

As is clear from the above description, the ultrasonic atomizer according to the present invention is constructed by attaching a container to the output device of a piezoelectric transformer, and the piezoelectric transformer can obtain mechanical vibrations with a large amplitude with a small amount of electric power. This makes it possible to efficiently atomize liquid even when using a small electric power source such as a battery, which is of great practical value.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the operation of a general piezoelectric transformer, Fig. 2 is an electric circuit diagram showing a specific example of an oscillation circuit for oscillating the piezoelectric transformer, and Fig. 3 is an ultrasonic atomization device according to the present invention. FIG. 4 to FIG. 7 are perspective views showing other embodiments of the main structure. 1... Piezoelectric ceramic plate, 2, 2'... Input side electrode, 3.
...Output side electrode, 4...Piezoelectric transformer,
14, 14', 20... Container, 15...
・Aromatic liquid (liquid). Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. A container is attached to the output end of a piezoelectric transformer in which opposing input side electrodes are formed on a portion of the front and back sides of a piezoelectric ceramic plate, and an output side electrode is formed on one end surface on which this electrode is not formed. An ultrasonic atomizer, characterized in that the liquid in the container is atomized by attaching the piezoelectric transformer to oscillate the piezoelectric transformer. 2. Claim 1, in which a part of the output end of the piezoelectric transformer is unpolarized, and a metal container is attached to this unpolarized part.
The ultrasonic atomization device described in Section 1. 3. Claim 1, in which an insulator is attached to a part of the output end of the piezoelectric transformer, and a metal container is attached on the insulator.
The ultrasonic atomization device described in Section 1. 4. The ultrasonic atomization device according to claim 1, wherein the container is made of an insulating material. 5. The ultrasonic atomization device according to claim 1, wherein the side surface of the container has an exponentially curved shape.