JPH0446871Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in the use of a cleaning vibrator in an ultrasonic cleaner.

(Prior art) In ultrasonic cleaning machines, the output of ultrasonic waves is determined by the distance between the wave sending surface of a vibrator that emits ultrasonic waves towards the liquid surface in a cleaning liquid and the liquid surface (hereinafter referred to as liquid depth). It is hoped that this will not change. To this end, it is required that the pure resistance component of the impedance (hereinafter referred to as motional impedance) of the vibrator viewed from the drive source side remains as unchanged as possible with respect to the change in liquid depth.

In the configuration of a conventional ultrasonic cleaning machine, only either a magnetostrictive vibrator or an electrostrictive vibrator is used as the vibrator.

The above will be explained with reference to a characteristic diagram of motional impedance versus liquid depth of a conventional ultrasonic cleaner shown in FIG.

In FIG.
An ultrasonic wave is emitted toward the liquid surface 20 at a distance of .

FIG. 3b is a diagram showing the relationship between motional impedance and liquid depth when the vibrator 18 is a magnetostrictive vibrator. When the liquid depth is an integral multiple of 1/2 of the wavelength λ of the ultrasonic wave, The above impedance is the maximum. Fig. 3c shows the case where the vibrator 18 is an electrostrictive vibrator.
This is a diagram showing the relationship between motional impedance and liquid depth, and when the liquid depth is an odd multiple of 1/4 of λ, the above impedance is maximum.

(Problems to be solved by the invention) As mentioned above, in conventional ultrasonic cleaning machines, only either the magnetostrictive vibrator or the electrostrictive vibrator is used. c.
As shown in Figure 2, regardless of whether a magnetostrictive or electrostrictive vibrator is used, the motional impedance changes greatly periodically with the liquid depth, so there is a problem that the ultrasonic output changes greatly with the liquid depth. be.

The purpose of this invention is to use both magnetostrictive and electrostrictive oscillators, and to electrically connect these oscillators in series and excite them, thereby minimizing changes in overall motional impedance with respect to liquid depth. An object of the present invention is to provide an ultrasonic cleaner that can obtain an ultrasonic output that does not change much with respect to liquid depth, which has not been possible with conventional ultrasonic cleaners.

(Means for solving the problems) In order to achieve the above object, the present invention has the following means configuration.

That is, the ultrasonic cleaning machine of the present invention uses both a magnetostrictive vibrator and an electrostrictive vibrator as a cleaning vibrator,
The ultrasonic cleaning machine is characterized in that excitation to the vibrator is performed by electrically connecting both of the vibrators in series.

(Function) The function of the ultrasonic cleaning machine of the present invention will be explained below. The ultrasonic cleaning machine of the present invention uses both a magnetostrictive vibrator and an electrostrictive vibrator, and they are electrically connected in series, so the overall motional impedance to liquid depth characteristic is This is the sum of the characteristics when using the vibrator alone and the characteristics when using the electrostrictive vibrator alone.

In other words, when the wavelength of an ultrasonic wave is expressed as λ, if only either a magnetostrictive oscillator or an electrostrictive oscillator is used, the fluctuation period of the motional impedance of each is λ/2, but when both The overall motional impedance fluctuation period of the ultrasonic cleaner of the present invention that uses the above-mentioned combinations is λ/4. Further, the variation range of the motional impedance is also narrower than when only either the magnetostrictive vibrator or the electrostrictive vibrator is used.

As described above, compared to conventional ultrasonic cleaners, the change in motional impedance with respect to liquid depth can be reduced, and therefore ultrasonic waves with little change in output with respect to liquid depth can be obtained.

(Example) Examples of the ultrasonic cleaning machine of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an ultrasonic cleaning machine according to an embodiment, and FIG. 2 is an explanatory diagram of the motional impedance versus liquid depth characteristic of the embodiment.

In FIG. 1, 2 is a magnetostrictive vibrator, and 3 is an electrostrictive vibrator. Both vibrators are placed on the bottom surface of the cleaning tank 1 and transmit ultrasonic waves toward the liquid surface.

2a is a winding that excites the magnetostrictive vibrator 2, and is electrically connected in series with the input terminal 3a of the electrostrictive vibrator 3 (see a in FIG. 2).

Figure 2a shows a structure in which a magnetostrictive vibrator 2 and an electrostrictive vibrator 3 placed on the bottom of the cleaning tank 1 are directly electrically connected via wiring 4, similar to the conventional one. A state in which the vibrator drive source 7 is connected is shown.
Figure 2b shows the motional impedance versus liquid depth characteristics when the magnetostrictive oscillator 2 or the electrostrictive oscillator 3 is used alone, and when both are used together as described above. So, 12 is
Characteristic curve when magnetostrictive vibrator 2 is used alone, 13
are characteristic curves when the electrostrictive vibrator 3 is used alone, the variation width of each motional impedance is a, and the wavelength of the ultrasonic wave is λ.

The characteristic curve 15 when the magnetostrictive vibrator 2 and the electrostrictive vibrator 3 are electrically connected in series and used together is the sum of curve 12 and curve 13 as a result of the above series connection, and the characteristic curve 15 is the sum of curve 12 and curve 13 as a result of the above series connection. The period of fluctuation is λ/2 to λ/4 compared to when each oscillator is used alone.
decreases to Also, for variable θ and constant b, curve 12 is |asinθ|+b, and curve 13 is |asin(θ±
λ/4) | When drawing a linear line represented by +b,
The fluctuation range of curve 15 is reduced from the fluctuation range a of curves 12 and 13 to (√2-1)a.

(Effects of the invention) As explained above, in the ultrasonic cleaning machine of the invention, the magnetostrictive vibrator and the electrostrictive vibrator are electrically connected in series and used together, so that the vibrator's
The pure resistance component of the impedance as seen from the drive source side, that is, the motional impedance, changes both in period and width with respect to liquid depth compared to when each of the above-mentioned vibrators is used alone. This means that ultrasonic output that does not change much with liquid depth can be obtained, which was not possible with other ultrasonic cleaners.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an ultrasonic cleaning machine according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the motional impedance versus liquid depth characteristic of an embodiment of the present invention, and Fig. 3 is a diagram showing the motion of a conventional ultrasonic cleaning machine. It is a characteristic diagram of impedance versus liquid depth. 1...Cleaning tank, 2...Magnetostrictive vibrator, 2a...Winding, 3...Electrostrictive vibrator, 3a...Input terminal, 4...
...Wiring, 7... Vibrator drive source, 12... Characteristic curve when magnetostrictive vibrator 2 is used alone, 13... Characteristic curve when electrostrictive vibrator 3 is used alone, 15...
Characteristic curve when magnetostrictive vibrator 2 and electrostrictive vibrator 3 are electrically connected in series and used together, 18... Vibrator, 19... Liquid depth, 20... Liquid level, a... Magnetostrictive vibration The variation range when the element 2 and the electrostrictive vibrator 3 are used alone, λ...the wavelength of the ultrasonic wave.

Claims (1)

[Scope of utility model registration request] An ultrasonic cleaning machine characterized in that a magnetostrictive vibrator and an electrostrictive vibrator are used together as a cleaning vibrator, and the vibrator is excited by electrically connecting both vibrators in series.