JPS5933028B2 - Ultrasonic atomizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic atomizer equipped with an ultrasonic vibrator for atomization, and its first object is to provide a storage tank with an opening at the bottom, and a storage tank with an opening at the bottom. The ultrasonic transducer has a disc-shaped ultrasonic transducer whose upper surface faces into the storage tank and whose peripheral edge is liquid-tightly attached via a packing made of an elastic material. A first electrode is provided on the upper surface including the peripheral edge, and a disk-shaped second electrode is provided on the lower surface, and the ultrasonic wave atomizes the liquid in the storage tank by the ultrasonic wave from the ultrasonic vibrator. In the atomization device, the packing covers the upper surface of the ultrasonic vibrator from its outer periphery by at least a width approximately 1.7 times or more the thickness of the ultrasonic vibrator, and secondly, In the above-mentioned ultrasonic atomization device, the ratio of the diameter of the upper surface of the ultrasonic vibrator facing into the storage tank to the diameter of the second electrode is 13:14.
To provide an ultrasonic atomizer that can significantly improve the atomization efficiency by an ultrasonic vibrator by simply selecting the shape and dimensions of the packing appropriately by setting the configuration in the range from 16 to 14. be.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a storage tank with an open top surface, which is disposed inside an outer box (not shown), and has a circular opening 3 formed at its bottom 2, and a boss 4 facing downward at the periphery of this opening 3. It is integrally formed.

Reference numeral 5 denotes a support having a flange 5a on its upper inner periphery, a flange 5b on its lower outer periphery, and an opening 5c in the center, which is fitted into the opening 3 of the storage tank 1.

6 is a disc-shaped ultrasonic transducer, which is made by firing an electrostrictive magnetic material such as barium titanate porcelain into a disc shape, and wraps around the transducer body □ from the top surface to the periphery. In addition to forming the first electrode 8, a disk-shaped second electrode 9 is formed on the lower surface at a predetermined distance from the first electrode 8, and these first and second electrodes 8 In this configuration, a high electric field is applied between the oscillator body 7 and 9 to polarize the vibrator body 7.

Then, the peripheral edge of the ultrasonic vibrator 6 is inserted into the groove 11 formed in the inner peripheral edge of the annular packing 10 made of an elastic material such as rubber, and in this state, the ultrasonic vibrator 6 is inserted into the packing 10. It is also placed in the support 5 so as to close the opening 5c. Then, an annular receiver 12 is inserted into the support 5, and a plurality of screws 13 (two (only shown in the figure) is screwed and tightened to the boss portion 4, thereby attaching the ultrasonic transducer 6 to the opening 3 of the storage tank 1 in a fluid-tight manner. At this time, the thickness t and diameter d of the ultrasonic transducer 6 are set to 1.271 Lm and 2 Lm, respectively.
0 m7n, and the packing 10 extends the top surface of the ultrasonic transducer 6 from its outer periphery to at least approximately 1.7 times (about 2 mU) the thickness dimension t-1.2 mU of the ultrasonic transducer 6.
．． 0 mm) or more, for example, by 1-2.5 mm, and the diameter d' of the portion of the upper surface of the ultrasonic transducer 6 facing into the storage tank 1 is, for example, 15 m7.
! L (this is the thickness dimension t=1 of the ultrasonic transducer 6 mentioned above)
, 2 mm or more) and the diameter D of the second electrode 9 is set to 14 mu, for example, so that the diameter d' to the diameter The ratio of D is set to be in the range of 13:14 to 16:14. The ultrasonic vibrator 6, when excited by a high frequency oscillation circuit (not shown), irradiates ultrasonic waves to a liquid such as water in the storage tank 1 to atomize it. According to the results of experiments conducted by the inventor of the present application, it was found that the atomization efficiency of the ultrasonic atomization device having the above configuration was improved by up to about 30% compared to the conventional one. .

Firstly, the packing 10 causes the ultrasonic transducer 6 to
the top surface of at least the ultrasonic transducer 6 from its outer periphery;
Thickness dimension t=1.2m7! By having a structure that covers only 1-2.5m1L, which is approximately 1.7 times the width of L,
The ultrasonic transducer 6 due to thickness vibration of the ultrasonic transducer 6
The packing 10 is extremely effective in reducing vibrations generated at the peripheral edge of the ultrasonic vibrator 6 among the reflected waves from the outer peripheral edge which is the fulcrum of the ultrasonic vibrator 6 and the circumferential direction vibration of the ultrasonic vibrator 6 that occurs simultaneously with the thickness vibration. This is considered to be because the thickness vibration mode of the ultrasonic transducer 6 is not disturbed by the reflected waves and the like. Secondly, the ultrasonic transducer 6
The diameter dimension d of the part of the upper surface facing into the storage tank 1
'' to the diameter dimension D of the second electrode 9 from 13:14 to 1.
By setting the ratio up to 6:14, the ultrasonic waves generated by the vibration of a large part of the thickness vibration energy corresponding to the second electrode 9 of the ultrasonic transducer 6 are concentrated into the storage tank. It is thought that this is because the liquid inside 1 is irradiated. FIG. 4 shows the diameter d'' of the upper surface of the ultrasonic transducer 6 facing into the storage tank 1 versus the diameter D of the second electrode 9.
This is an experimental result showing the increase/decrease in the amount of mist generated when the ratio of d' to D is changed (the input to the ultrasonic transducer 6 is constant). The fog generation amount M is at its maximum at the time of . Therefore, according to the present embodiment described above, by simply selecting the shape and dimensions of the packing 10 appropriately according to the shape and dimensions of the ultrasonic transducer 6, the atomization efficiency by the ultrasonic transducer 6 can be improved compared to the conventional one. It is extremely convenient because it can increase the soil cover by up to 30% compared to conventional products, and can be applied to conventional products with a simple operation of replacing the packing.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, and it goes without saying that the present invention can be implemented with appropriate modifications without departing from the spirit of the invention.

As explained above, the present invention can provide an ultrasonic atomization device that has the practical effect of significantly improving the atomization efficiency by the ultrasonic vibrator simply by appropriately selecting the shape and dimensions of the packing.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a vertical cross-sectional side view of the main part, Fig. 2 is a perspective view of the ultrasonic transducer from below, and Fig. 3 is a vertical sectional side view of the main part.
The figure is a partially sectional perspective view of the packing, and FIG. 4 is a curve diagram of experimental results by the inventor of the present application. In the figure, 1 is a storage tank, 2 is a bottom, 3 is an opening, 6 is an ultrasonic transducer, 7 is a transducer body, 8 is a first electrode, 9 is a second electrode, 10 is a packing, and 11 is a The groove is shown.

Claims (1)

[Scope of Claims] 1. A storage tank having an opening at the bottom, a top surface of the storage tank facing the inside of the storage tank, and a peripheral portion of the storage tank liquid-tightly attached via a packing made of an elastic material. A first electrode is provided on the upper surface including the peripheral edge of the ultrasonic vibrator, and a second disk-shaped electrode is provided on the lower surface of the ultrasonic vibrator. In the device in which the liquid in the storage tank is atomized by ultrasonic waves from an ultrasonic vibrator, the packing extends the upper surface of the ultrasonic vibrator from its outer periphery to at least approximately 1 of the thickness of the ultrasonic vibrator. .An ultrasonic atomizer characterized in that it covers a width of 7 times or more. 2. A storage tank with an opening at the bottom, and a disc-shaped disk whose top face faces into the storage tank and whose peripheral edge is fluid-tightly attached to the opening of the storage tank via a packing made of an elastic material. an ultrasonic vibrator, a first electrode is provided on the upper surface including the peripheral edge of the ultrasonic vibrator, and a disc-shaped second electrode is provided on the lower surface of the ultrasonic vibrator. In the device that atomizes the liquid in the storage tank by ultrasonic waves, the ratio of the diameter of the portion of the upper surface of the ultrasonic vibrator facing into the storage tank to the diameter of the second electrode is 13. 14 to 16 to 1
4. An ultrasonic atomization device characterized by having a range of up to 4.