JP2006223968A - Ultrasonic cleaner and ultrasonic washing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic cleaner capable of effectively cleaning the material to be washed which has desposits of the foreign matter such as oil and fluxing agent or leaves the burr and of conducting the burr removal. <P>SOLUTION: The ultrasonic cleaner is provided with a washing tank 1 to store a washing solution 10 by immersing the material 11 to be washed in the washing solution 10 to wash, ultrasonic generation means 5, 7 to impart ultrasonic vibration to the washing solution 10 in the washing tank 1 and a magnetic field generation means 2 to allow the magnetic field in which the strength changes with lapse of time to act to the washing solution 10. Alternatively, the ultrasonic cleaner is provided with a washing tank 1 to store a washing solution 10 by immersing the material 11 to be washed in the washing solution 10 to wash and ultrasonic generation means 5, 7 to impart ultrasonic vibration to the washing solution 10 in the washing tank 1 wherein the ultrasonic generation means can generate ultrasonic wave comprised of multiple wave formed by synthesizing the basic wave and high frequency having frequency of 4-20 times of the basic wave. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an ultrasonic cleaning apparatus and an ultrasonic cleaning method for performing cleaning, deburring and the like of an object to be cleaned by applying ultrasonic vibration to a cleaning liquid in which the object to be cleaned is immersed.

Normally, foreign matter such as oil and flux adheres to the surface of mechanical parts and electronic parts in the manufacturing process, or burrs formed during processing remain, and after these foreign substances are removed The final product. Conventionally, an ultrasonic cleaning apparatus has been used as one of the methods for removing the deposits and burrs. In a basic ultrasonic cleaning apparatus, an object to be cleaned such as water is immersed in a cleaning liquid such as water stored in a cleaning tank, and ultrasonic waves are applied to the cleaning liquid from an ultrasonic vibrator installed at the bottom of the cleaning tank. Radiate. This ultrasonic wave causes cavitation in the cleaning liquid. The shock wave generated when the cavitation collapses acts on the surface of the object to be cleaned, whereby the processing such as cleaning and deburring is performed. Therefore, it is possible to enhance the cleaning action by effectively generating cavitation with ultrasonic waves. Conventionally, a cleaning apparatus with an improved cleaning effect has been proposed based on such a viewpoint. For example, in the cleaning liquid, gas such as air is mixed and dissolved air increases. When there is a lot of dissolved air, water molecules are difficult to decompose, and when ultrasonic vibration is applied, power is consumed for molecular decomposition of water and cavitation is less likely to occur. In the ultrasonic cleaning apparatus proposed in Patent Document 1, the gas dissolved in the cleaning liquid supplied to the ultrasonic cleaning tank is degassed by the degassing means, thereby facilitating the occurrence of cavitation due to ultrasonic vibration, Therefore, the cleaning effect is improved.
JP-A-1-34647

However, in the conventional ultrasonic cleaning apparatus and cleaning method as described above, the water molecules of the cleaning liquid to be used have a cluster structure, and the ultrasonic vibration is transmitted in this state. If a large mass of molecules collides with the object to be cleaned and the ultrasonic wave is strong, there is a problem that the surface of the object to be cleaned is damaged. For this reason, there is a case where ultrasonic waves having a force for sufficiently removing foreign matters such as oil and flux adhering to the object to be cleaned cannot be emitted.
It has been proposed that the ultrasonic cleaning apparatus subdivides clusters (for example, JP-A-7-144180 and JP-A-2002-65606), but the subdivided clusters are easily recombined. There is a problem of end.

  The present invention has been made against the background of the above circumstances, and an object thereof is to provide a cleaning apparatus and a cleaning method that improve the cleaning effect without damaging the object to be cleaned.

  That is, among the ultrasonic cleaning apparatuses of the present invention, the invention according to claim 1 is a cleaning tank for storing a cleaning liquid and immersing an object to be cleaned in the cleaning liquid and cleaning the cleaning liquid in the cleaning tank with ultrasonic waves. Ultrasonic wave generating means for applying vibration, and magnetic field generating means for applying a magnetic field whose strength changes over time to the cleaning liquid.

  According to a second aspect of the present invention, there is provided an ultrasonic cleaning apparatus according to the first aspect, wherein the magnetic field generating means comprises an electromagnet for generating a magnetic field and a voltage applying means for applying a voltage to the electromagnet. The applying means is characterized in that a voltage having a frequency of 500 KHz to 1 MHz can be applied to the electromagnet.

  According to a third aspect of the present invention, there is provided an ultrasonic cleaning apparatus according to the first or second aspect, wherein the ultrasonic wave generating means synthesizes a fundamental wave and a high frequency having a frequency 4 to 20 times the fundamental wave. It is possible to generate ultrasonic waves composed of multiple waves.

  The invention of the ultrasonic cleaning apparatus according to claim 4 is a cleaning tank for storing cleaning liquid and immersing an object to be cleaned in the cleaning liquid for cleaning, and generation of ultrasonic waves for radiating ultrasonic waves to the cleaning liquid in the cleaning tank. And the ultrasonic wave generation means is capable of generating an ultrasonic wave composed of a fundamental wave and a multiplexed wave obtained by synthesizing a high frequency having a frequency 4 to 20 times that of the fundamental wave.

  According to a fifth aspect of the present invention, there is provided the ultrasonic cleaning apparatus according to any one of the second to fourth aspects, wherein the high frequency comprises a sweep wave.

  In the ultrasonic cleaning method according to the sixth aspect of the invention, the cleaning liquid is degassed and the clusters are subdivided by applying a magnetic field whose strength changes with time to the cleaning liquid, and further, an object to be cleaned is immersed in the cleaning liquid. In addition, the non-cleaning object is cleaned by applying ultrasonic vibration to the cleaning liquid.

  According to one aspect of the ultrasonic cleaning apparatus of the present invention, since the magnetic field generating means for applying a magnetic field whose strength changes with time to the cleaning liquid is provided, the cleaning liquid such as water has its cluster structure by the action of the magnetic field. Are subdivided and the subdivided structure is maintained. By applying ultrasonic vibration to the object to be cleaned immersed in the cleaning liquid and performing ultrasonic cleaning, removal of foreign matters adhering to the object to be cleaned, removal of flux, deburring, and the like can be effectively performed. Since the cluster structure is subdivided, the surface of the object to be cleaned is less susceptible to local damage, and it is possible to increase the output of the ultrasonic wave and obtain a greater cleaning effect.

The magnetic field changes in strength over time, and the strength changes continuously over time, the magnetic field is intermittent, the NS direction of the magnetic field changes, and combinations of these Things. Of these, in order to effectively prevent recombination of the subdivided clusters, it is desirable that the magnetic field is intermittent.
When the intermittent magnetic field acts on the cleaning liquid, it becomes possible to more efficiently subdivide the clusters of water molecules in the cleaning liquid. When a constant magnetic field is applied, the action of the magnetic field stabilizes and there is a problem that the fragmented water molecules recombine, but by applying the intermittent magnetic field action, the recombination of the subdivided clusters is more effective. Effectively suppressed.

  If the magnetic field generating means generates a magnetic field by applying a voltage within a frequency range of 500 KHz to 1 MHz to the electromagnet, a sufficient clustering effect can be obtained, and in addition to this effect, the cleaning liquid A sufficient deaeration effect is obtained, and the cleaning effect is further improved. Depending on the magnetic field generated by applying a voltage having a frequency outside this range, a sufficient effect on deaeration cannot be obtained.

  The magnetic field generating means applies a magnetic field whose strength changes with time to the cleaning liquid. The magnetic field generating means can be configured by an electromagnet and voltage applying means for applying a voltage whose magnitude changes with time, such as a pulse waveform, to the electromagnet. The voltage application means can be configured to generate voltage such as pulsating current, alternating current, pulse wave, sawtooth wave, and the output wave is specific as long as it can change the magnetic field with time It is not limited to. However, it is desirable that the output wave be a pulse wave in order to make the change in the magnetic field noticeable (intermittently performed).

  The electromagnet used in the magnetic field generating means is usually installed in the middle of the flow path for supplying the cleaning liquid to the cleaning tank or toward the cleaning tank. Preferably, a magnetic field is applied to the cleaning liquid supply path or the like before the cleaning liquid is stored in the cleaning tank. In the arrangement of the electromagnets, for example, at least one electromagnet is provided in a disc-shaped magnetic field generating means main body having a hollow portion for allowing the flow path to penetrate the central portion. At this time, it is desirable that the magnetic pole surface of the electromagnet is disposed so as to face the center of the magnetic field generating means body, that is, the center of the flow path. With this arrangement, a magnetic field can be effectively applied toward the flow path so as to surround the flow path. The plurality of electromagnets can be electrically connected in series, in parallel, or in a mixed state. Furthermore, a plurality of electromagnets can be individually controlled, and a magnetic field can be generated by shifting the timing of voltage application to each electromagnet. For example, it is possible to set three electromagnets so that one electromagnet generates a magnetic field while the other two electromagnets do not generate a magnetic field, and sequentially switch the electromagnets that generate the magnetic field. It is.

  In addition, a plurality of magnetic field generating means bodies can be arranged at intervals in the flow direction of the flow path, and by arranging an electromagnet in each magnetic field generating means main body, a magnetic field can be more effectively applied to the flow paths. Can do. Furthermore, when a plurality of magnetic field generation means bodies are arranged, the installation positions of the electromagnets between adjacent magnetic field generation means bodies are shifted from each other in the rotation direction around the central axis with respect to the flow path direction. Is preferred. For example, if each of the magnetic field generating means main bodies has four electromagnets, and each of the magnetic field generating means main bodies has an arrangement angle shifted by 30 ° intervals, the magnetic field is evenly and effectively applied to the cleaning liquid flowing through the flow path. Can act.

Next, according to another aspect of the ultrasonic cleaning apparatus of the present invention, the ultrasonic wave generating means comprises a fundamental wave and a multiplex wave obtained by synthesizing a high frequency having a frequency 4 to 20 times the fundamental wave. Ultrasonic waves can be applied, and the ultrasonic waves hit the details of the object to be cleaned as compared with ultrasonic waves consisting only of the fundamental frequency, and the cleaning action can be significantly enhanced. If the frequency of the high frequency is not within the above range with respect to the frequency of the fundamental wave, the effect of improving the cleaning action by the multiple wave cannot be sufficiently obtained. The strength of the high frequency with respect to the fundamental wave is not particularly defined in the present invention, but for example, 1/6 to 1/4 of the strength of the fundamental wave can be exemplified. The cleaning effect can be enhanced by appropriately determining the relative strength of the high frequency.
When combining the fundamental wave and the high frequency, it is desirable to synthesize a high frequency having only the same vibration direction component as the vibration direction of the fundamental wave. Thereby, the cleaning effect by ultrasonic vibration can be further enhanced.

  In the multiplexed wave, it is desirable that the high frequency is a sweep wave (wavelength is continuously changed). In the case of multiple waves having a constant frequency, the ultrasonic wave hits the same part of the object to be cleaned, but the part where the ultrasonic vibration acts is changed by sweeping the high frequency, and the cleaning effect is enhanced. In sweeping, it is desirable to change the wavelength randomly in order to enhance the cleaning effect. It is desirable to sweep the frequency of the sweep wave within a range of 4 to 20 times the frequency of the fundamental wave.

  The ultrasonic means includes, for example, one or a plurality of ultrasonic vibrators and an oscillator having a circuit that generates an AC signal, and an AC voltage is applied to the ultrasonic vibrator by the oscillator. By operating the sonic transducer, ultrasonic waves are radiated into the cleaning liquid. The emitted ultrasonic wave hits the object to be cleaned immersed in the cleaning liquid, and the object to be cleaned is cleaned.

  The oscillator generates a rectangular wave voltage having a frequency of a voltage applied to the ultrasonic transducer, converts the generated rectangular wave voltage into a sine wave voltage, and converts the converted voltage into an ultrasonic wave It can comprise by what is provided with the coil applied to a vibrator | oscillator. The inductance value of the coil is preferably different from the inductance value calculated from the vibration frequency of the ultrasonic transducer and the capacitance of the ultrasonic transducer. Preferably, the inductance value of the coil is 1/32 to 2/16 of the calculated inductance value. By setting the inductance value of the coil, the burr removal action is particularly improved. Particularly preferably, the ratio is 1/16.

As described above, according to one aspect of the ultrasonic cleaning apparatus of the present invention, a cleaning tank that contains a cleaning liquid and immerses and cleans an object to be cleaned in the cleaning liquid, and a cleaning liquid in the cleaning tank And an ultrasonic wave generating means for applying ultrasonic vibration to the cleaning liquid, and a magnetic field generating means for applying a magnetic field whose strength changes over time to the cleaning liquid. The washing object can be washed effectively. Further, since the clusters are subdivided, damage to the surface of the object to be cleaned due to the clusters can be avoided, so that it is possible to enhance the ultrasonic wave and enhance the cleaning action.
In addition, when the time change of the magnetic field is set to an appropriate frequency, a sufficient degassing action of the cleaning liquid can be obtained, and cavitation can be satisfactorily generated by ultrasonic vibration, thereby further enhancing the cleaning action.

  According to another aspect of the ultrasonic cleaning apparatus of the present invention, a cleaning liquid is accommodated, and a cleaning tank for immersing an object to be cleaned in the cleaning liquid for cleaning, and an ultrasonic wave is radiated to the cleaning liquid in the cleaning tank. The ultrasonic wave generating means is capable of generating an ultrasonic wave composed of a fundamental wave and a multiplex wave composed of a high frequency having a frequency 4 to 20 times that of the fundamental wave. And high frequency ultrasonic vibrations are obtained, and the high frequency is combined with the fundamental wave, so that the ultrasonic vibrations can be applied to the details of the object to be cleaned.

  When the high frequency is a sweep wave, the vibration position of the high frequency synthesized with the fundamental wave fluctuates with respect to the fundamental wave, so that the entire object to be cleaned can be subjected to ultrasonic vibration.

(Embodiment 1)
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram according to an embodiment of an ultrasonic cleaning / deburring apparatus to which the present invention is applied.
An ultrasonic cleaning apparatus 100 according to the present invention shown in FIG. 1 radiates ultrasonic waves into cleaning water 10 to perform processing such as cleaning and deburring of an object 11 immersed in cleaning water 10. It is.
In the ultrasonic cleaning apparatus 100, the cleaning tank 1, the cleaning water treatment apparatus 2, the cleaning water supply apparatuses (3, 4), the oscillator 5, and the ultrasonic vibrator 7 are classified into large categories. The cleaning tank 1 is a tank that stores therein cleaning water 10 for cleaning the object 11 to be cleaned. The cleaning water supply device is a device for supplying the cleaning water 10 to the cleaning tank 1, and is composed of the cleaning water supply pipe 3 and the cleaning water pump 4, and corresponds to the magnetic field generating means of the present invention. 2 is attached. The cleaning water treatment apparatus 2 is an apparatus for decomposing and subdividing the cluster structure of the cleaning water 10 supplied to the cleaning tank 1.
The oscillator 5 is a device for applying a voltage having a predetermined waveform to the ultrasonic transducer 7. The ultrasonic transducer 7 is a device that is installed in the lower part of the cleaning tank 1 and oscillates by the voltage applied from the oscillator 5 to emit ultrasonic waves into the cleaning water 10. The ultrasonic vibrator 7 includes a plurality of vibration elements 70, and the ultrasonic waves are radiated from the ultrasonic vibrator 7 into the cleaning water 10 by vibrating them. The oscillator 5 and the ultrasonic vibrator 7 constitute an ultrasonic wave generating means.

In the ultrasonic cleaning apparatus 100 of the present invention configured as described above, mechanical parts and electronic parts that require cleaning and deburring are targeted as the object to be cleaned 11 and are placed in the cleaning tank 10. The object to be cleaned 11 is not necessarily made of metal, and may be made of any material as long as it requires cleaning, deburring, and the like. When performing cleaning, deburring, etc., a predetermined amount of cleaning water 10 is stored in the cleaning tank 1, and the cleaning water 10 is constantly circulated by the cleaning water supply device during cleaning and deburring. The washing water 10 extracted from the washing tank 1 is guided to the washing water pump 4 through the washing water supply pipe 3 and sent from there to the washing water treatment apparatus 2. In the cleaning water treatment apparatus 2, the cleaning water 10 is supplied to the cleaning tank 1 in a state where molecular aggregates are subdivided. In this embodiment, the cleaning water 10 is used as the cleaning liquid of the ultrasonic cleaning apparatus. However, instead of water, a cleaning agent or the like may be used as the cleaning liquid.
Further, when the object to be cleaned 11 is cleaned or deburred, since ultrasonic waves are radiated into the cleaning water 10, the oscillator 5 is activated, and a voltage having a predetermined waveform generated there is applied to the vibration element 70. The ultrasonic vibrator 7 vibrates and ultrasonic waves are emitted. Cavitation occurs in the cleaning water 10 due to the emitted ultrasonic waves, and the object to be cleaned 11 is cleaned and deburred using the action.

  In the ultrasonic cleaning apparatus 100 of the present invention that operates as described above, the cleaning water processing apparatus 2 that performs processing for decomposing the cluster structure of the cleaning water 10 supplied to the cleaning tank 1, and the ultrasonic vibration for ultrasonic radiation. The oscillator 5 that applies a voltage to the child 7 has the following characteristics.

First, the cleaning water treatment apparatus 2 will be described. FIG. 2 is a configuration diagram showing a partial configuration (magnetic field generator 20) of the cleaning water treatment apparatus 2 according to the present embodiment. In the figure, a magnetic field generator 20 includes a disc-shaped magnetic field generator main body 21 (substrate) for fixing four electromagnets, a cleaning water supply pipe cavity 21 a provided at the center of the magnetic field generator main body 21, and a magnetic field. The electromagnets 22 to 25 are fixed to the generator main body 21.
The electromagnets 22 to 25 are arranged such that adjacent electromagnets form an angle of 90 ° with respect to the rotation direction with respect to the center of the magnetic field generator main body 21. The electromagnets 22 to 25 are iron core-containing electromagnets. In the present embodiment, the electromagnets 22 to 25 are all electrically connected in series in order to cause these electromagnets to act simultaneously. However, in the present invention, the electromagnets 22 to 25 generally include connecting all in parallel. Arbitrary electrical connections are possible, and the electromagnets can be individually excited without being electrically connected.
In addition, the arrangement of the magnetic poles of the electromagnets 22 to 25 is shown in FIG. 2 so that the N pole side faces all the direction of the cleaning water supply pipe cavity 21a when a current is passed. In the present invention, the arrangement of the magnetic poles of the electromagnets 22 to 25 can be arbitrarily determined. However, in any case, it is desirable that the line segment connecting the center of the N pole and the center of the S pole is directed to the center of the magnetic field generator main body 21.

In this embodiment, four electromagnets are used, but one or more electromagnets may be used, and an arbitrary number can be used. In the case where a plurality of magnetic fields are formed, it is preferable that the magnetic fields to be formed are arranged at an equal angle so as to uniformly act on the water in the cleaning water supply pipe 3. Although omitted in FIG. 2, in addition to the above-described components, the magnetic field generator main body 21 includes connector terminals and electric wirings for supplying voltages to be applied to the electromagnets 22 to 25.
The magnetic field generator main body 21 can be separated into two semicircular plates so that the cleaning supply pipe 3 is passed through the cleaning water supply pipe cavity 21a. After passing through the supply pipe cavity 21a, the separated semi-discs can be fitted to each other by a pin connector or the like for ensuring electrical integrity, so that the original disk can be restored. It has become. The material forming the magnetic field generator main body 21 can be, for example, synthetic resin, glass, or metal. The diameter of the cleaning water supply pipe cavity 21 a corresponds to the outer diameter of the cleaning water supply pipe 3.

  Although the water supplied to the washing tank 1 passes through the washing water supply pipe 3, for example, pure water, DI water (water with less impurities), and tap water are possible. The strength of the magnetic force of the electromagnets 22 to 25 can be set by selecting an optimum value according to the type of cleaning water 10, the flow rate, the diameter of the cleaning water supply pipe 3, and the like. Further, as one preferred embodiment by experiment, 280 μH with 220 turns (number of turns) can be obtained and used.

  FIG. 3 is a waveform diagram showing an example of a waveform of a voltage applied to the magnetic field generator according to the present embodiment. A pulse voltage is applied to the magnetic field generator (electromagnets 22 to 25) shown in FIG. FIG. 3A shows the waveform when the duty ratio is not 1: 1 (case 1), and FIG. 3B shows the waveform when the duty ratio is 1: 1 (case 2). In this embodiment, the duty ratio of the voltage applied to the magnetic field generator can be arbitrarily set.

  The frequency range of the pulse voltage varies depending on the type of cleaning water 10, the flow rate, the diameter of the cleaning water supply pipe 3, etc., but the frequency range is from 10 KHz to 20 GHz, particularly from 500 KHz to 1 MHz (optimally Is intermittently pulsed at about 800 KHz), effectively decomposing and subdividing the cluster structure of water molecules passing through the magnetic field generator installed in the water flow path (cleaning liquid flow path), You can get a qi action.

FIG. 4 is a configuration diagram illustrating a configuration including a pulse voltage generation circuit (corresponding to a voltage application unit) of the cleaning water treatment apparatus 2 according to the present embodiment. In FIG. 4, the pulse voltage generation circuit of this embodiment includes a DC power supply unit 200, a CR oscillator 201, and a current amplification circuit 203. These configurations constitute the voltage applying means of the present invention. Reference numeral 20 denotes the above-described magnetic field generator (circuit element of the magnetic field generator 20).
An input source of power supplied from the DC power supply unit 200 is a DC stabilized power supply. It is also possible to use a dedicated battery. A main component of the CR oscillator 201 is a CR transmission circuit including a resistor and a capacitor, and converts a DC voltage supplied from the DC power supply unit 200 into a pulse voltage. The current amplifier circuit 203 amplifies the pulse voltage output from the CR oscillator 201. In the present embodiment, the main electrical components of the magnetic field generating means 20 are the electromagnets 22 to 25 shown in FIG. 2 connected in series.

  As described above, according to the washing water treatment apparatus 2 of this embodiment, even when the water flowing through the water flow path (washing water supply pipe 3) has a cluster structure of water molecules, By passing the magnetic field generation means, the cluster can be subdivided by the action of intermittent magnetism, and the effect of deaeration can be obtained by changing the strength of the magnetic field by applying a voltage of an appropriate frequency There is.

FIG. 5 is a configuration diagram illustrating another embodiment of the cleaning water treatment apparatus 2. In FIG. 5, three magnetic field generators X30, Y30, and Z30 are arranged at regular intervals along the water flow path (washing water supply pipe 3). As shown in FIG. 5B, the configuration of the magnetic field generators X30, Y30, and Z30 is such that in the magnetic field generator X30, electromagnets X32 to X35 are arranged at equiangular intervals with respect to the central axis in the magnetic field generator body X31. Similarly, in the magnetic field generators Y30 and Z30, the electromagnets Y32 to Y35 and the electromagnets Y32 to Y35 are arranged at equal angular intervals with respect to the central axis in the magnetic field generator main bodies X31 and Z31.
Furthermore, in the magnetic field generators X30, Y30, and Z30, in the magnet arrangement, the line segments connecting the center of the magnetic field generator main body and the magnetic pole centers of the permanent magnets are shifted by 30 degrees. That is, the magnet of the magnetic field generator Y30 is arranged at a position where the line segment is rotated 30 degrees to the right of the magnet of the magnetic field generator X30, and the magnet of the magnetic field generator Z30 has the line segment of the magnetic field generator Y30. It is arranged at a position rotated by 30 degrees to the right of the magnet.

  In the present embodiment, the number of magnetic field generator main bodies is set to 3, but in the present invention, it may be 1 or 2 or 4 or more. In addition, when the number of electromagnets fitted to each magnetic field generator main body is four, the above rotation angle is (90 / n) degrees when n is the number of installed main bodies. A uniform rotating magnetic field is given to the water passing through the water flow path, and the best water quality improvement effect can be obtained, but the rotation angles between adjacent magnetic field generators are different from each other. Is also possible.

  The arrangement interval of the magnetic field generators X30, Y30, and Z30 on the water flow path is determined by the strength of the magnetic force generated by each magnetic field generator (related to the execution distance of the magnetic flux) and the water that has passed through each magnetic field generator. Although it can be set in consideration of the distance at which the cluster starts recombination, it can be set to 1.0 to 2.0 times (for example, 15 cm) of the effective reach distance of magnetic flux (for example, 10 cm). Moreover, in this embodiment, although the arrangement | positioning space | interval is constant, the distance between each magnetic field generator can be made different.

  Next, FIG. 6 is a waveform diagram showing a waveform example of a voltage applied to the magnetic field generator of the embodiment shown in FIG. The pulse voltage shown in FIG. 6 is applied to the magnetic field generators X30, Y30, and Z30 shown in FIG. That is, the duty ratio of the pulse voltage is set to be twice as long as the time period in the low level state as compared to the time period in the high level state. Further, regarding the phase, the pulse voltage applied to the magnetic field generator Y30 is delayed by a time length of one high-level state (1/3 period) from the pulse voltage applied to the magnetic field generator X30. In addition, the pulse voltage applied to the magnetic field generation unit Z30 is delayed by the time length of one high-level state (1/3 period) from the pulse voltage applied to the magnetic field generation device Y30. .

The frequency of the pulse voltage varies depending on the type of water to be treated, the flow rate, the diameter of the water flow path (wash water supply pipe 3), etc., but the frequency range is 10 KHz to 20 GHz, particularly 500 KHz to 1 MHz (optimum) In the range of about 800 KHz), a high water quality improvement effect can be achieved.
Since the pulse voltage shown in FIG. 6 is applied to the magnetic field generators X30, Y30, and Z30 shown in FIG. 5, the electromagnets X22 to X25, Y22 to Y25, and Z22 held in the magnetic field generators X30, Y30, and Z30. The magnetic force generation of .about.Z25 is intermittently pulsed and given a rotation angle as shown in FIG. 5 (a). Further, according to the waveform of the applied voltage shown in FIG. 6, the magnetic field generators X30 and Y30. Since the magnetic force generation time of Z30 is different, the molecular cluster structure passing through the magnetic field generators X30, Y30, Z30 installed in the water flow path is further finely decomposed and subdivided. Clusters can be formed, and reclustering due to recombination of water molecules can be prevented.

  In this embodiment, the pulse voltage applied to the magnetic field generators X30, Y30, and Z30 is as shown in FIG. 6 (that is, the high voltage state of the three systems of pulse voltages is continuous). In the present invention, it is assumed that a low level state is interposed between the high level states of a plurality of pulse voltages (that is, in FIG. 6, the magnetic field generator is simultaneously with the end of each pulse voltage to the magnetic field generator X30 in FIG. It is also possible to start with each pulse voltage to Y30, but the pulse voltage to the magnetic field generator Y30 is passed after a lapse of a predetermined time from the end of each pulse voltage to the magnetic field generator X30).

Next, FIG. 7 is a block diagram showing a pulse voltage generation circuit corresponding to the voltage application means of the cleaning water treatment apparatus 2 of the embodiment shown in FIG.
In FIG. 7, the pulse voltage generation circuit includes a DC power supply unit 300, a CR oscillator 301, a shift register 302, and a current amplifier circuit 303. Reference numerals X30 to Y30 denote magnetic field generators (circuit elements of the magnetic field generators X30 to Z30 shown in FIG. 5). The power input source supplied from the DC power supply unit 300 can use a DC stabilized power supply and a dedicated battery. A main component of the CR oscillator 301 is a CR transmission circuit including a resistor and a capacitor, and converts a DC voltage supplied from the DC power supply unit 300 into a pulse voltage.
The shift register 302 converts the pulse voltage supplied from the CR oscillator 301 into a pulse voltage of a plurality of outputs (a plurality of systems) applied to the magnetic field generators X30, Y30, and Z30 as shown in FIG. The current amplification circuit 43 amplifies the pulse voltage for the magnetic field generation means X30, Y30, Z30 output from the shift register 302. In the present embodiment, the main electric components of the magnetic field generators X30 to Z30 are the electromagnets X32 to X35, Y32 to Y35, and Z32 to Z35 shown in FIG. 5 connected in series.

  As described above, according to this embodiment, even when the water flowing through the water flow path has a cluster structure of water molecules, this water is allowed to pass through the magnetic field generators X30, Y30, and Z30. As a result, the cluster structure of water molecules passing through the water channel can be further subdivided by the action of magnetism that is interrupted in pulses, and reclustering due to recombination of water molecules can be prevented. There is.

In this embodiment, three magnetic field generators including four electromagnets are used, but the number of electromagnets fitted to the magnetic field generator main body is 5 or more, or 3 or less. The number of electromagnets fitted to the main body of the magnetic field generation device may be different for each magnetic field generation device, or may be the same number. Further, as shown in FIG. 5, the electromagnets in each magnet generator are preferably arranged at equiangular intervals on concentric circles of the central axis of the main body, but are arranged at positions deviated from the equiangular interval arrangement. It doesn't matter.
Furthermore, as a modified example of this embodiment, the method of applying the pulse voltage in this embodiment is used as it is, and 12 electromagnets adjacent to each other form an angle of 30 ° with respect to the center of the disk-shaped magnetic field generator body. The cleaning water treatment apparatus 2 can also be configured by a single magnetic field generator having an electromagnet.

  In this case, the first group of four electromagnets that form an angle of 90 ° with each other is excited first, and then the second group of four electromagnets rotated by 30 ° with respect to the first group of electromagnets is excited. Finally, a third group consisting of four electromagnets rotated by 30 ° with respect to the second group of electromagnets is excited, and then returns to the excitation of the four electromagnets of the first group, and this is repeated thereafter. Become. Thereby, a rotating magnetic field is formed in one magnetic field generator, and water molecules can be subdivided more effectively under the action of the rotating magnetic field.

As a further modification, a pulse voltage is sequentially applied to all electromagnets in one rotation direction without grouping 12 electromagnets fitted to a single or three disc-shaped bodies. The magnetic field may be rotated 360 °.
In the two modified examples described above, the number of electromagnets is not the essence of the present invention, and the cleaning water treatment apparatus 2 using 13 or more or 11 or less electromagnets may be used.
Furthermore, in the second embodiment described above and its modification, the case where the timing of the pulse voltage applied to the electromagnet is controlled so that the magnetic field rotating in a certain direction acts on the water molecule will be described. However, it is also possible to control the timing of the pulse voltage in such a manner that the rotation direction of the magnetic field is reversed at a predetermined timing.

  As described above, according to the cleaning water treatment apparatus 2 (magnetic field generating means) of the ultrasonic cleaning apparatus 100 according to the present embodiment, the water molecule clusters can be effectively subdivided and once subdivided. It is possible to prevent recombination of the formed clusters of water molecules. Therefore, since the cleaning water 10 with the cluster structure subdivided is provided to the cleaning tank 1 and the surface of the object to be cleaned 11 can be prevented from being scratched by the cleaning water, the emitted ultrasonic wave can be made stronger than before, and the cleaning power can be increased. Can be improved. In addition, it is possible to obtain a sufficient deaeration effect of the cleaning liquid by changing the strength of the magnetic field with time at an appropriate frequency. Further, the cleaning water treatment apparatus 2 has an advantage that the structure is simple and it can be easily installed at an arbitrary location in the water flow path.

  Next, the oscillator 5 of the ultrasonic cleaning apparatus 100 according to this embodiment will be described. FIG. 8 is a configuration diagram showing a schematic circuit configuration of the oscillator 5. As described above, the oscillator 5 is a part that generates a voltage having a predetermined waveform to be applied to the ultrasonic transducer 7, and as shown in FIG. 8, the filter circuit 51, the rectifier circuit 52, the inverter circuit 53, and the pulse generation circuit. A54, pulse generation circuit B55, and secondary circuit 56 are mainly configured.

  In the oscillator 5, filtering and rectification processing are performed in the filter circuit 51 and the rectifier circuit 52 with respect to the electric power input from a general power supply 50 or the like, and the voltage that has become a rectangular wave is input to the inverter circuit 53. In the inverter circuit 53, the pulse generation circuit A54, and the pulse generation circuit B55, the frequency of the voltage output to the ultrasonic transducer 7 and the waveform of a rectangular wave are determined. Thereafter, the voltage is transformed with the secondary circuit 56, and the voltage that is a rectangular wave is converted into a sine wave and output to the ultrasonic transducer 7. It is known that applying an sine wave voltage to an ultrasonic transducer in an ultrasonic cleaning device is more effective than applying a rectangular wave voltage.

One feature of the oscillator 5 is that the voltage output to the ultrasonic transducer 7 is a multiple wave. FIG. 9 is a diagram illustrating the waveform of the voltage output from the oscillator 50. In FIG. 9, a high frequency (FIG. 9B) having a higher frequency than the fundamental wave is added to a sine wave that is a fundamental wave (FIG. 9A) to form the multiplexed wave (FIG. 9C). This is an example. In this example, the high frequency is rectified in synchronization with the positive / negative of the output of the fundamental wave. For example, the multiple wave is generated by adding a waveform of 25 kHz to 535 kHz (preferably 100 to 500 kHz, a frequency 4 to 20 times the fundamental wave) to a 25 kHz fundamental wave.
Of the multiple waves, the fundamental wave portion is generated based on the pulse generation circuit A54 described above, and the wave added to the fundamental wave is generated based on the pulse generation circuit B55. Conventional oscillators usually do not have this pulse generation circuit B55, but this oscillator 5 has this circuit, and based on this, the above-described multiwave voltage is applied to the ultrasonic transducer 7. This is one of the features of the present invention.

  As described above, when the multi-wave voltage as described above is applied to the ultrasonic transducer 7, the voltage applied to the object to be cleaned 11 is more than that when only the voltage of the fundamental wave ((a) in FIG. 9) is applied. It has been experimentally obtained that the cleaning and deburring ability is improved. By using the oscillator 5, it is possible to improve the cleaning and deburring effect as compared with the conventional case.

Next, another feature of the oscillator 5 will be described. In the secondary circuit of the oscillator 5, as described above, the voltage and the voltage value determined are converted into a sine wave, but the inductance L value of the choke coil 561 installed for the conversion process is changed. There are features.
FIG. 10 is a diagram showing a schematic circuit around the secondary circuit 56 in the oscillator 5. A choke coil 561 in FIG. 10 is the choke coil in the secondary circuit 56 described above, and the voltage output to the ultrasonic transducer 7 is converted into a sine wave. This oscillator 5 is characterized by the inductance L value of the choke coil 561. Conventionally, when the capacitance C in the ultrasonic vibrator 7 and the vibration frequency f of the ultrasonic vibrator 7 (that is, the frequency of the fundamental wave in the multiplexed wave output from the oscillator 5) are determined, The inductance L of the choke coil is obtained by the following formula (1).
f = 1 / (2π (LC) ^1/2 ) (1)
F in the equation (1) is usually called a resonance frequency. Therefore, conventionally, the value of the inductance L is set so that the vibration frequency of the ultrasonic transducer 7 becomes this resonance frequency. .

  However, in the present oscillator 5, the inductance L is set to a value different from the value obtained from the equation (1). Specifically, the value is 1/32 to 2/16 (optimally about 1/16) of the value obtained from the equation (1). By using such values, it has been experimentally obtained that the ultrasonic vibrator 7 having the same specifications has a higher deburring capability than the conventional one. It becomes possible to improve the efficacy of. In the present embodiment, the choke coil 561 is composed of two coils as shown in FIG.

As described above, the oscillator 5 according to the present embodiment has two main characteristics, and the effects of cleaning and deburring can be improved by these characteristics.
As described above, by using the ultrasonic cleaning apparatus 100, the cluster of the cleaning water 10 is subdivided, and the vibration of the ultrasonic vibrator 7 effective for cleaning and deburring is performed. Therefore, it is possible to improve the effectiveness of cleaning and deburring than before.

Furthermore, in another embodiment of the present invention, the high frequency can be a sweep wave. In this case, a sweep wave can be generated by including a known sweep circuit in the pulse generation circuit B described above. The sweep wave is preferably swept at a frequency 4 to 20 times the frequency of the fundamental wave.
FIG. 11 shows a multiplexed wave (FIG. 11C) generated by synthesizing a fundamental wave (FIG. 11A) and a sweep wave (FIG. 11B) as a high frequency. When the high frequency is swept, the phase position of the high frequency vibration component superimposed on the fundamental wave fluctuates, and the action of ultrasonic vibration on the object to be cleaned can be applied to the entire object to be cleaned. Can be further improved.

In the ultrasonic cleaning apparatus 100 according to the present embodiment, the apparatus is provided with the cleaning water treatment apparatus 2. However, the ultrasonic cleaning apparatus 100 is configured not to include the cleaning water treatment apparatus 2, and mainly includes the characteristics of the oscillator 5 described above. (Ie, using multi-wave ultrasound). In this case, it is preferably used mainly as a deburring device. On the other hand, when the cleaning water treatment apparatus 2 is provided (a magnetic field whose strength changes with time is applied to the cleaning liquid), but does not have the characteristics of the oscillator 5 (multi-wave ultrasound is not essential). You can also That is, the cleaning water treatment device 2 is added to the conventional ultrasonic cleaning device. In this case, it is preferably used mainly as a cleaning device.
Although the present invention has been described based on the above embodiment, the present invention is not limited to the description of the above embodiment, and can be modified without departing from the scope of the present invention.

1 is a schematic configuration diagram illustrating an ultrasonic cleaning apparatus according to an embodiment of the present invention. Similarly, it is a partial block diagram of a magnetic field generator. Similarly, it is a figure which shows the waveform of the voltage applied to a magnetic field generator. Similarly, it is a figure which shows the structure of the voltage application means in a magnetic field generation means. It is a block diagram which shows a part of magnetic field generator in other embodiment of this invention. Similarly, it is a figure which shows the waveform of the voltage applied to a magnetic field generator. Similarly, it is a figure which shows the structure of the voltage application means in a magnetic field generation means. Similarly, it is the figure which showed the schematic circuit structure of the oscillator in an ultrasonic wave generation means. Similarly, it is a figure which shows the waveform of the voltage output from an oscillator. Similarly, it is a figure which shows the schematic circuit around the secondary circuit in this oscillator. It is a figure which shows the waveform of the voltage output by the ultrasonic wave generation means in other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Washing tank 2 Washing water processing apparatus 3 Washing water supply pipe 4 Washing water pump 5 Oscillator 7 Ultrasonic vibrator 70 Vibration element 10 Washing liquid 11 Object to be cleaned 20 Magnetic field generator 21 Magnetic field generator main body 21a Cavity 22 for cleaning water supply pipe , 23, 24, 25 Electromagnet 200, 300 DC power supply unit 201, 301 CR oscillator 302 Shift register 203, 303 Current amplification circuit X30, Y30, Z30 Magnetic field generator X31, Y31, Z31 Magnetic field generator body X32, X33, X34 , X35 Electromagnets Y32, Y33, Y34, Y35 Electromagnets Z32, Z33, Z34, Z35 Electromagnet 51 Filter circuit 52 Rectifier circuit 53 Inverter circuit 54 Pulse generation circuit A
55 Pulse generator B
56 Secondary circuit 561 Choke coil

Claims (6)

  A cleaning tank that contains the cleaning liquid and immerses an object to be cleaned in the cleaning liquid, an ultrasonic generator that applies ultrasonic vibration to the cleaning liquid in the cleaning tank, and the strength of the cleaning liquid changes with time. An ultrasonic cleaning apparatus comprising: a magnetic field generating means for applying a magnetic field.   The magnetic field generating means includes an electromagnet for generating a magnetic field and a voltage applying means for applying a voltage to the electromagnet, and the voltage applying means can apply a voltage having a frequency of 500 KHz to 1 MHz to the electromagnet. The ultrasonic cleaning apparatus according to claim 1.   3. The ultrasonic wave generation unit is capable of generating ultrasonic waves composed of multiple waves obtained by combining a fundamental wave and a high frequency having a frequency 4 to 20 times that of the fundamental wave. 4. Ultrasonic cleaning device.   A cleaning tank for storing a cleaning liquid and immersing an object to be cleaned in the cleaning liquid for cleaning; and an ultrasonic wave generating means for radiating ultrasonic waves to the cleaning liquid in the cleaning tank. An ultrasonic cleaning apparatus capable of generating an ultrasonic wave composed of multiple waves obtained by combining a wave and a high frequency having a frequency 4 to 20 times that of the fundamental wave.   The ultrasonic cleaning apparatus according to claim 2, wherein the high frequency is a sweep wave.   The cleaning liquid is degassed and the clusters are subdivided by applying a magnetic field whose strength changes with time to the cleaning liquid, and further, the cleaning object is immersed in the cleaning liquid and ultrasonic vibration is applied to the cleaning liquid to perform the non-cleaning. An ultrasonic cleaning method characterized by cleaning an object.

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