JPH0334317Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an ultrasonic cleaner with enhanced cleaning power.

Conventional technology Conventionally, in an ultrasonic cleaning machine, a piezoelectric substrate is provided at the bottom of a cleaning tank, and an oscillator is connected to this piezoelectric substrate.When water or cleaning liquid is poured into the cleaning tank and the oscillator is driven, ultrasonic waves are emitted from the piezoelectric substrate. A system has been proposed in which a sound wave is generated and an object to be cleaned placed in a cleaning tank is cleaned by the ultrasonic wave.

Problems that the invention aims to solve In conventional ultrasonic cleaning machines configured in this way, the ultrasonic waves generated from the piezoelectric substrate are emitted from the substrate in the form of a narrow beam, so the object to be cleaned has a complex shape. However, if the cleaning method is used, the ultrasonic waves cannot reach every corner, resulting in uneven cleaning.

Means for Solving the Problems In order to solve the above problems, the present invention configures the bottom of the cleaning tank or the entire cleaning tank with a piezoelectric substrate,
A plurality of rod-shaped electrodes, U-shaped electrodes, and comb-shaped electrodes are formed at the bottom of the cleaning tank and/or the entire cleaning tank, and a variable frequency oscillator is connected between these rod-shaped electrodes or U-shaped electrodes and the comb-shaped electrode. It is characterized by what it did.

Function The present invention supplies a variable frequency signal to a plurality of rod-shaped electrodes or U-shaped electrodes and comb-shaped electrodes provided on the piezoelectric substrate at the bottom and/or the entire cleaning tank to cause the generated ultrasonic beam to oscillate. This eliminates uneven cleaning, and by making the frequency variable, fixed standing waves are eliminated within the cleaning tank.Furthermore, by making the entire cleaning tank from ceramic, which serves as a piezoelectric substrate, the cleaning tank has corrosion and chemical resistance. It has the advantage of being compact and has improved cleaning ability due to higher frequency.

Embodiment FIG. 1 is a diagram for explaining the principle of the present invention, in which rod-shaped electrodes 2a, 2b, 2
c, 2d are arranged in parallel, and these rod-shaped electrodes 2a,
Terminals 3a, 3b, 3c, 3d to 2b, 2c, 2d
is connected. Moreover, these rod-shaped electrodes 2a, 2
electrodes 4a, 4b, 4c, 4 between b, 2c, 2d
d are arranged, and these electrodes 4a, 4b, 4c, 4d
A common electrode 5 at one end is connected to form a comb-shaped electrode, and this common electrode 5 is grounded. Then, when an electric signal of a predetermined frequency is supplied from terminals Ta and Tb, which are paired terminals 3a and 3b and 3c and 3d, sound waves are generated from the surface along the boundary between liquid and solid, as shown in Figure 2. . This angle θ is given by θ=sin ¹ Vc/df=sin ¹ λ _f /d. However, d is the electrode 4a, 4b, 4
c, 4d..., Vc is the propagation velocity of the sound wave in the liquid, and λ _f is the wavelength of the sound wave in frequency. In Figure 2, surface sound waves are "Lamb waves" at frequencies below 100 MH, and "Rayleigh waves" are effective at higher frequencies, but Lamb waves are used in cleaning machines.

FIG. 3 shows a sectional view of an ultrasonic cleaning machine according to an embodiment of the present invention, in which the cleaning tank 9 is provided with a piezoelectric ceramic substrate 10 at the bottom, and the cleaning liquid 11 comes into contact with the piezoelectric ceramic substrate 10. No. 1 on the side that doesn't
A plurality of rod-shaped electrodes 12 and comb-shaped electrodes 13 shown in the figure
A variable frequency oscillator 14 is connected to the rod-shaped electrode 12 and the comb-shaped electrode 13.

In the ultrasonic cleaning machine of this embodiment configured in this way, when variable frequency power is supplied from the variable frequency oscillator 14 to the rod-shaped electrode 12 and the comb-shaped electrode 13, surface acoustic waves (Lamb waves) are generated in the cleaning liquid 11. A certain sound wave is generated, but the angle of generation of this sound wave changes as shown in the above equation, so even if the object to be cleaned placed in the cleaning liquid 11 has a complicated structure, the sound wave will reach every corner, making it easy to clean. This has the advantage of eliminating unevenness. Further, conventional ultrasonic cleaners generate low-frequency ultrasonic waves, but in this embodiment, high-frequency ultrasonic waves are generated, and the cleaning ability is improved by increasing the frequency.

In the above embodiment, the piezoelectric ceramic substrate 10 is provided at the bottom of the cleaning tank 9, but the entire cleaning tank 9 may be made of piezoelectric ceramic. In that case,
Since the rod-shaped electrodes 12 and the comb-shaped electrodes 13 can be provided not only on the bottom surface of the cleaning tank 9 but also on the side surfaces, there is an advantage that sound waves from all angles are generated and uneven cleaning is eliminated. Moreover, by constructing the entire cleaning tank 9 from piezoelectric ceramic, there is an advantage that the cleaning tank 9 has corrosion resistance, chemical resistance, and is compact. Further, in the above embodiment, a rod-shaped electric rod is used, but it is also possible to use a U-shaped electrode with one end of the rod-shaped electrode connected.

Effects of the Invention As is clear from the above explanation, the present invention consists of a piezoelectric ceramic for the bottom of the cleaning tank or the entire cleaning tank, and a plurality of rod-shaped electrodes or U-shaped electrodes provided on the piezoelectric ceramic and a comb-shaped electrode. By supplying a variable frequency signal to the electrode and causing the generated ultrasonic beam to oscillate, uneven cleaning can be eliminated, and by making the frequency variable, fixed standing waves within the cleaning tank can be eliminated, and the entire cleaning tank can be By making the cleaning tank from piezoelectric ceramic, it has the advantage of being corrosion resistant and chemical resistant, making it compact, and also improving the cleaning ability due to the use of high frequency waves.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram for explaining the principle of the present invention, Fig. 2 is an explanatory diagram for generating sound waves using the configuration of Fig. 1, and Fig. 3 is an ultrasonic cleaning of the first embodiment of the present invention. FIG. DESCRIPTION OF SYMBOLS 1... Piezoelectric substrate, 9... Cleaning tank, 10... Piezoelectric ceramic substrate, 11... Cleaning liquid, 12... Rod-shaped electrode, 13... Comb-shaped electrode, 14... Variable frequency oscillator.

Claims (1)

[Claims for Utility Model Registration] 1. The bottom of the cleaning tank or the entire cleaning tank is composed of a piezoelectric substrate, and the bottom of the cleaning tank and/or the entire cleaning tank is provided with a plurality of rod-shaped electrodes, U-shaped electrodes, and comb-shaped electrodes. A variable frequency oscillator is connected between these rod-shaped electrodes or U-shaped electrodes and comb-shaped electrodes to generate surface acoustic waves (Lamb waves) generated by the rod-shaped electrodes or U-shaped electrodes and comb-shaped electrodes. An ultrasonic cleaning machine that is characterized by its use. 2. The ultrasonic cleaning machine according to claim 1, wherein the rod-shaped electrode, the U-shaped electrode, and the comb-shaped electrode are provided on the outer surface of the cleaning tank.