JPH0420546Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ultrasonic cleaning device, and more specifically, it uses the oscillation output of an ultrasonic vibrator to transmit ultrasonic waves generated in a cleaning fluid to a specific location. The present invention relates to an ultrasonic cleaning device that concentrates on ultrasonic cleaning.

[Prior Art] As is well known, with the recent development of precision industry, a large number of highly precise devices that are able to avoid oil, fats, cutting chips, and other dust have come to be produced. Ultrasonic cleaning devices are widely used as devices for efficiently cleaning these highly precise devices.

Conventional ultrasonic cleaning equipment used for this purpose generally has an ultrasonic vibrator 3' disposed at the bottom 2' of a cleaning tank 1' as shown in FIG. The oscillation output causes the cleaning fluid 4' contained in the cleaning tank 1' to vibrate ultrasonically.

As shown in FIG. 7, such a conventional ultrasonic cleaning device transmits the oscillation output of an ultrasonic vibrator 3' to the entire cleaning fluid 4' contained in a cleaning tank 1'. The entire section 4' is subjected to ultrasonic vibration.
For this reason, the ultrasonic waves spread throughout the cleaning tank, making it impossible to increase the density of ultrasonic waves per unit area, and the limit was 12 to 22 W per unit area.

Furthermore, as a result of the present applicant inserting aluminum foil 5' into the cleaning tank 1' and investigating the state of cavitation distribution,
As shown in FIG. 8, recesses 6' were formed in the transverse direction at regular intervals on the aluminum foil 5'. This revealed that cavitation was also distributed throughout the cleaning tank 1'.

Therefore, the energy generated on the surface of the object to be cleaned is also small when considered per unit area. For this reason, it has not been possible to meet the demand for powerful ultrasonic cleaning of small objects to be cleaned.

A cleaning device disclosed in Japanese Utility Model Publication No. 36-10539 is known as a device capable of obtaining a powerful ultrasonic cleaning action.

In this cleaning device, a cylindrical reflection plate (hollow conical horn) is arranged to surround the ultrasonic vibrator placed at the bottom of the cleaning tank, and the oscillation output of the ultrasonic vibrator is reflected by the cylindrical reflection plate. In addition to confining the ultrasonic transducer inside, the cylindrical reflecting plate is formed to become narrower toward the top, thereby concentrating the oscillation output of the ultrasonic transducer on a specific location.

[Problems to be solved by the invention] As described above, in a device that uses a cylindrical reflector to concentrate the oscillation output of an ultrasonic transducer, the ultrasonic waves pass through the reflector and the oscillation output decreases. There was a problem that a sufficient concentration effect could not be obtained.

In other words, even if the reflector is made of a stainless steel plate with a thickness of about 6 m/m, if the angle between the direction of propagation of the ultrasonic sound and the inner wall of the reflector becomes a certain angle, the ultrasonic wave will be transmitted and will not be reflected or concentrated. I couldn't do it. The same thing happened when glass and plastic were used as materials. It is possible to prevent transmission by making the thickness of a metal plate such as a stainless steel plate 10 m/m or more, but this is not practical because it is difficult to process the reflector and the weight of the device becomes heavy.

The present invention was created in view of the above points,
The purpose of this is to eliminate the transmission of ultrasonic waves in a cleaning device that concentrates the transmitted output of an ultrasonic transducer using a reflector plate, to ensure a concentration effect, and to make it possible to process the reflector plate. The object of the present invention is to provide an ultrasonic cleaning device that can be easily manufactured and can avoid an increase in weight.

[Means for Solving the Problems] The present invention has the following technical means to achieve the above object. That is, to explain using the reference numerals used in the attached drawings corresponding to the embodiments, an ultrasonic vibrator is placed at the bottom of the cleaning tank, and the oscillation output of this ultrasonic vibrator causes the vibration to be carried into the cleaning tank. This ultrasonic cleaning device is designed to perform ultrasonic cleaning on objects to be cleaned, in which a cylindrical reflecting device is installed in the cleaning tank 1 so as to surround an ultrasonic vibrator 3 disposed at the bottom of the cleaning tank 1. A plate 4 is arranged to confine the oscillation output of the ultrasonic transducer 3 inside the cylindrical reflecting plate 4, and the cylindrical reflecting plate 4 is formed to become narrower as it goes upward. However, in the device in which the oscillation output of the ultrasonic transducer 3 is concentrated in a specific cylindrical shape 7, the reflecting plate 4 has a cross-sectional structure of a double structure of thin plates, and the hollow interior is filled with gas G. This is an ultrasonic cleaning device characterized by a layered structure.

[Function] Since the present invention includes the above-mentioned technical means, the oscillation output of the ultrasonic transducer can be confined within the cylindrical reflecting plate 4. Therefore, the ultrasonic density inside the cylindrical reflection plate 4 can be increased. Further, since the cylindrical reflecting plate 4 is formed to become narrower as it goes upward, the ultrasonic waves can be concentrated at a specific location in the cleaning fluid 2. Therefore, strong cavitation can be generated at the specific location 7. Further, since the reflecting plate has a double structure, it is possible to prevent transmission of ultrasonic waves and ensure concentration of ultrasonic output. Furthermore, since the reflecting plate has a double structure of thin plates, it is easy to manufacture and the device can be made lighter.

[Embodiment] Next, a preferred first embodiment of the present invention will be described in detail with reference to the accompanying drawings FIGS. 1 to 3.

In the figure, reference numeral 1 indicates a cleaning tank, in which a cleaning fluid 2 for ultrasonically cleaning an object to be cleaned is contained. An ultrasonic vibrator 3 is provided on the bottom surface 1a of the cleaning tank 1.
is arranged, and this ultrasonic vibrator 3 is capable of ultrasonically vibrating the cleaning fluid 2 contained in the cleaning tank 1 by ultrasonic vibration when supplied with power through a power supply line (not shown).

Next, reference numeral 4 denotes a cylindrical reflection plate that stands upright from the bottom surface 1a of the cleaning tank 1, and is provided so as to surround the ultrasonic transducer 3. This cylindrical reflecting plate 4
The lower part of the is formed into a square cross section with the horizontal length L and the vertical length M being the same length, and the approximately central portion 5 of each wall surface 4a is bent inward at an angle θ to form the upper opening 6. However, it is formed small so that the vertical length is m.

That is, this cylindrical reflecting plate 4 is formed so that the upper side of its approximately central portion 5 becomes narrower as it goes upward, so that ultrasonic waves propagating upward from below the cylindrical reflecting plate 4 are formed. I am now able to concentrate.

The cross-sectional structure of the wall surface of the reflecting plate 4 is shown as a single mark in FIGS. 1 to 3. In this case, the applicant, the inventor, etc. tried experiments using various boards, but
Even if the thickness of the stainless steel plate was set to about 6 m/m, when the angle reached a certain angle, ultrasonic waves would easily pass through and could no longer be used for sufficient reflection or concentration. Glass and plastic give almost similar results. Also, check the thickness of metal such as stainless steel plate.
If it is more than 10 m/m, it will be difficult to process and it will be too heavy to be practical.

Therefore, in order to solve this problem, as shown in Fig. 6, a reflective plate 4 made of a double layer of thin plates made of plastic, glass, or metal plates was used, and a gas G (air, etc.) was placed in between.
A layer was formed, which was then processed into a cylindrical body for use.

Next, the operation of the above embodiment will be explained.

Since the ultrasonic cleaning device of this embodiment is configured as described above, the ultrasonic waves generated in the cleaning fluid 2 when the ultrasonic vibrator 3 is driven are confined within the cylindrical reflecting plate 4. become. The ultrasonic waves thus confined within the cylindrical reflection plate 4 are
The light propagates upward within the cylindrical reflecting plate 4 as shown by the dashed line in the figure.

The cylindrical reflecting plate 4 is formed so that its upper side becomes narrower as it goes upwards from its approximately central portion 5, so that the ultrasonic waves propagating upward are reflected by hitting the upper wall surface 4a... do. By concentrating this reflected ultrasonic wave on a specific location 7,
Strong cavitation can be generated there.

In order to investigate the distribution of cavitation occurring inside the cylindrical reflector 4, an aluminum foil 8 was placed inside the cylindrical reflector 4, and as shown in FIG. Recess 9 at the position corresponding to
was formed intensively. As a result, the recess 9
It was confirmed that strong cavitation occurred at point 7. Therefore, if the object to be cleaned is placed at the specific location 7, powerful ultrasonic cleaning can be performed. The reflector 4 has a double structure,
Since a layer of gas G is formed in between, ultrasonic waves are not transmitted, and ultrasonic waves can be concentrated and reflected reliably.

Next, a second embodiment of the present invention will be described in detail with reference to FIG. 4 of the accompanying drawings.

The substantial structure, purpose, and effects of this example are the same as those of the first embodiment, and the same parts are given the same reference numerals and the explanation thereof will be omitted.

As shown in FIG. 4, the wall surface 20 of the cylindrical reflector 4
is bent with a curvature R' from approximately the center part, and the wall surface 21 facing the wall surface 20 is bent with a curvature R larger than the above curvature R', thereby narrowing the upper part of the cylindrical reflecting plate 4 while bending it in one side direction. to curve it. On the other hand, the cleaning fluid 2 in the cleaning tank 1 is sucked in by the pump 22, and the sucked cleaning fluid 2 is discharged to the lower part of the cylindrical reflecting plate 4. In order to remove dust, etc. contained in the cleaning fluid 2, the circulation piping 2
3, a filter 24 is interposed therein. This embodiment is similar to the first embodiment in that the reflecting plate 4 has a double structure and a layer of gas G is formed between them.

Since this second embodiment is configured as described above, the horizontal length and curvature of the upper opening 6 are
R′, R, and flow velocity arrow 25 in the cylindrical reflector 4
By appropriately selecting , it is possible to concentrate the ultrasonic waves at a location spaced apart from the upper opening 6 by the distance t. Therefore, strong cavitation can be generated at the location where the ultrasonic waves are concentrated, and by positioning the object to be cleaned there, powerful ultrasonic cleaning can be performed. Since the ultrasonic waves can be prevented from passing through the reflection plate 4, the above-mentioned concentration effect can be ensured.

Next, a third embodiment of the present invention will be described in detail with reference to FIG. 5 of the accompanying drawings.

In this example, like the previous example, the wall surface 30 of the cylindrical reflecting plate 4, which is round, square, oblong, etc., is curved in one side while forming the upper part narrowly. The ultrasonic transducer 3 is disposed on the bottom 31 of the reflecting plate 4, and the reflecting plate 4 has a cylindrical shape.
surround the ultrasonic transducer 3. Then, the cleaning fluid 2 is caused to flow into the cylindrical reflection plate 4 through the fluid supply pipe 32 and jetted from the upper opening 6. At this time, the ultrasonic vibrator 3 is operated to cause the jetted fluid 2 to By applying ultrasonic vibrations and focusing the fluid 2 on the object 33 to be cleaned at a specific location 7, dirt on the surface of the object 33 is cleaned. The fallen dirt and fluids accumulate in the cleaning layer 1.

In this example, the ultrasonic frequency is changed from the conventional 28,
From 40KHz to 100KHz to 2MHz, the standing wave density and directivity of the ultrasonic wave become extremely strong, and cavitation balls do not occur. Instead, intense vibrations are used as molecular vibrations of the fluid for intensive cleaning purposes. convey information to the surface of things. Foreign matter on the surface is liberated by this vibration and is washed away at the same time. This is possible both in liquid and in air. By doing this, the distance traveled is short and the cavitation is small, but almost no development occurs.

It solves the drawbacks of ultrasonic cleaning using frequencies of 100KHz to 2MHz, and unlike 28KHz and 40KHz, it can perform soft and precise cleaning without damaging the surface of objects due to excessive cavitation. In this embodiment as well, ultrasonic waves are transmitted to the reflection plate 4.
Since it is possible to prevent ultrasonic waves from passing through, it is possible to reliably concentrate the ultrasonic waves.

[Effects of the invention] As detailed above, the present invention has a cylindrical reflecting plate 4 surrounding the ultrasonic transducer 3, which has a double cross-sectional structure of thin plates, and has a hollow interior filled with gas G. This layer has the effect of preventing ultrasonic waves from passing through the reflection plate 4 and reliably concentrating the ultrasonic waves on a specific location 7. Therefore, it is possible to provide an ultrasonic cleaning device with strong cleaning power.

Furthermore, since the reflecting plate can be easily processed, it is possible to provide an ultrasonic cleaning device with strong cleaning power without causing a rise in price.

Furthermore, the reflection can be ensured without increasing the weight of the reflector, and an ultrasonic cleaning device with strong cleaning power can be provided without increasing the weight.

[Brief explanation of the drawing]

The accompanying drawings, FIGS. 1 to 3, show a first embodiment of the present invention, with FIG. 1 being a plan view and FIG.
Figure 3 is a cross-sectional view along line A, Figure 3 is a plan view of the aluminum foil showing the distribution of cavitation, Figure 4 is the
5 shows a third embodiment, FIG. 6 shows a cross-sectional structure of a reflector in each embodiment, and FIGS. 7 and 8 show a conventional technique, FIG. 7 is a sectional view of the cleaning device, and FIG. 8 is a plan view of aluminum foil showing the distribution of cavitation in a conventional cleaning tank. In addition, in the figure, 1...Cleaning tank, 1a...Bottom surface, 2...
. . . cleaning fluid, 3 . . . ultrasonic vibrator, 4 . . . cylindrical reflection plate, 6 .

Claims (1)

[Claims for Utility Model Registration] (1) An ultrasonic vibrator is placed at the bottom of the cleaning tank, and the oscillation output of this ultrasonic vibrator causes the cleaning fluid contained in the cleaning tank to be ultrasonically vibrated. This is an ultrasonic cleaning device that ultrasonically cleans objects to be cleaned using a cylindrical reflector 4 in the cleaning tank 1 so as to surround an ultrasonic vibrator 3 disposed at the bottom of the cleaning tank. are arranged so that the oscillation output of the ultrasonic transducer 3 is confined within the cylindrical reflecting plate 4, and the cylindrical reflecting plate 4 is formed to become narrower as it goes upward. , in which the oscillation output of the ultrasonic transducer 3 is concentrated at a specific location 7, the reflecting plate 4 has a cross-sectional structure of a double structure of thin plates, and the hollow interior is a layer of gas G. An ultrasonic cleaning device characterized by: (2) The cylindrical reflecting plate 4 is formed into a rectangular tube shape, and approximately the central portion 5 of each wall surface 4a forming the rectangular tube.
2. The ultrasonic cleaning device according to claim 1, wherein the ultrasonic cleaning device is bent inward at an angle θ so that the width becomes narrower as it goes upward from a substantially central portion. (3) The cylindrical reflecting plate 4 is formed into a rectangular tube shape, and the upper side of the central portion is curved with curvatures R and R', and the tube becomes narrower as it goes upward. The cleaning fluid 2 is fed from below the cylindrical reflecting plate 4 to give a flow velocity to the cleaning fluid 2 inside the cylindrical reflecting plate 4, and the cleaning fluid 2 is added to the cleaning fluid 2 discharged to the outside from the upper opening 6. The ultrasonic cleaning device according to claim 1, wherein the ultrasonic cleaning device is configured to concentrate ultrasonic waves generated within the ultrasonic cleaning device.