JPS62791Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ultrasonic cleaner that performs cleaning using ultrasonic waves generated by an ultrasonic wave generating vibrator.

Conventionally, there has been known a type of cleaning tank in which a vibrator is attached to the cleaning tank, and the vibrator applies forced vibration to the cleaning tank.

FIG. 1 shows the configuration of this type of conventional ultrasonic cleaner. In this figure, a piezoelectric vibrator 2 for generating ultrasonic waves, which is formed by forming electrodes on both sides of a piezoelectric ceramic, is adhered to the bottom of a cleaning tank 1, and a cleaning liquid 3 is placed in the cleaning tank 1. In this case, if forced vibration is applied to the cleaning tank 1 by the vibrator 2, the cleaning tank 1 will vibrate ultrasonically and emit ultrasonic waves into the cleaning liquid 3 in the tank, thereby cleaning the cleaning items immersed in the cleaning liquid 3. I'm starting to do that.

However, with the configuration shown in FIG. 1, higher-order vibrations other than the main driving frequency appear in the cleaning tank 1, and complex vibration patterns overlap on the tank wall surface.
As shown by the dotted line in the figure, complex standing waves are generated, causing noise, and the generated excess vibration disturbs the phase conditions, making it impossible to obtain a sound field for effective cleaning effects. It was happening.

Originally, it is desirable for the bottom of the tank to have a vibration pattern that is similar to piston operation in terms of vibration. Therefore, the present invention aims to provide a highly efficient ultrasonic cleaner with less noise by forming the vibrator mounting surface on the bottom of the cleaning tank into a dome shape to suppress vibrations other than fundamental waves.

Embodiments of the ultrasonic cleaner according to the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the ultrasonic cleaner has a piezoelectric vibrator 2 for generating ultrasonic waves bonded to the bottom of a cylindrical cleaning tank 10 made of an elastic material and filled with a cleaning liquid 3. As shown in FIG. 3, a dome 11 projecting upward in a substantially spherical shape is integrally formed on the vibrator mounting surface of the bottom surface of the device 10. As shown in FIG.
The diameter of this dome 11 is set to be slightly smaller than the diameter of the vibrator 2, and the vibrator 2 is connected to the dome 11.
It is adhesively fixed to the cleaning tank 10 at the peripheral flat surface portion. The vibrator 2 may be one that vibrates in a radial mode as shown in FIG. 4, or one that vibrates in a thickness mode as shown in FIG.

FIG. 6 shows the vibration state of the bottom surface of the cleaning tank 10 when a vibrator 2 that vibrates in a radial mode is used. As can be seen from this figure, the bottom surface of the tank vibrates with the fundamental wave in a vibration pattern similar to piston operation, so no standing waves are generated on the side surface of the tank due to excessive vibration.

According to the above embodiment, by forming the vibrator mounting surface on the bottom of the cleaning tank 10 into a dome shape, vibrations other than the fundamental wave can be suppressed as much as possible, compared to the conventional structure shown in FIG. Cleaning efficiency from about 25 to
Can be improved by 30%.

Note that the cleaning tank is usually formed of an elastic metal plate such as stainless steel.

As described above, the present invention provides an ultrasonic cleaner that suppresses noise and excessive vibration and improves cleaning efficiency by forming the vibrator mounting surface on the bottom of the cleaning tank into a dome shape. get.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional ultrasonic cleaner, Fig. 2 is a sectional view showing an embodiment of the ultrasonic cleaner according to the present invention, and Fig. 3 is a bottom view showing the bottom of a cleaning tank used in the embodiment. 4 is a perspective view showing a vibrator vibrating in radial mode, FIG. 5 is a perspective view of a vibrator vibrating in thickness mode, and FIG. 6 is a sectional view for explaining the operation of the embodiment. . 1, 10...Cleaning tank, 2...Piezoelectric vibrator for generating ultrasonic waves, 3...Cleaning liquid, 11...Dome.

Claims (1)

[Scope of utility model registration request] In an ultrasonic cleaner in which a vibrator for generating ultrasonic waves is attached to the bottom of the cleaning tank, a substantially spherical dome is formed to protrude upward on the vibrator mounting surface of the bottom of the cleaning tank, and a flat surface around the dome is formed. An ultrasonic cleaner characterized in that the vibrator is bonded.