JP2009248066A - Ultrasonic cleaning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic cleaning device having a high cleaning capacity. <P>SOLUTION: The ultrasonic cleaning device 30 for cleaning a cleaning object in a cleaning tank 31 by applying ultrasonic vibration to liquid in the cleaning tank 31, is provided with a control part 46 controlling the whole liquid in the cleaning tank 31 to greatly vibrate by sweeping the oscillation frequency of ultrasonic wave within a given frequency range, and sweeping the sweep of the oscillation frequency with a given period. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ultrasonic cleaning apparatus for cleaning an object to be cleaned in a cleaning tank by applying ultrasonic vibration to a liquid in the cleaning tank.

2. Description of the Related Art Conventionally, an ultrasonic cleaning apparatus that cleans an object to be cleaned in a cleaning tank by applying ultrasonic vibration to a liquid in the cleaning tank is well known.
In an ultrasonic cleaning apparatus, cleaning unevenness or the like occurs at a single frequency. Therefore, a sufficient cleaning effect is obtained by sweeping the frequency of ultrasonic vibration (see, for example, Patent Document 1). .

Patent Document 2 discloses that the ultrasonic frequency is changed from 40.6 kHz to 37.4 kHz every 0.125 μs.
Patent Document 3 is provided with two ultrasonic generation mechanisms. One ultrasonic generation mechanism changes the frequency from 25 kHz to 31 kHz every 40 ms, and the other ultrasonic generation mechanism changes every 34 ms from 34 kHz to 42 kHz. Is disclosed.

JP-A-2-52083 Japanese Patent Laid-Open No. 5-301078 Japanese Patent Laid-Open No. 8-131978

  As described above, in a conventional ultrasonic cleaning apparatus, a configuration for sweeping ultrasonic waves is well known, but there is a problem that higher cleaning capability is required.

  The present inventors made extensive studies to further increase the cleaning efficiency. As a result, it was found that when the frequency is swept, further sweeping at this sweep cycle shows a very high cleaning ability, and the present invention has been conceived.

  Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide an ultrasonic cleaning apparatus having a high cleaning ability.

According to the ultrasonic cleaning apparatus of the present invention, in the ultrasonic cleaning apparatus that applies ultrasonic vibration to the liquid in the cleaning tank and cleans the object to be cleaned in the cleaning tank, the ultrasonic oscillation frequency is set to a predetermined value. And a controller that controls the entire liquid in the cleaning tank to vibrate greatly by sweeping within the frequency range and sweeping the oscillation frequency at a predetermined cycle.
By adopting this configuration, when the sweep of the oscillation frequency is further swept at a predetermined cycle, the entire liquid in the cleaning tank vibrates greatly when each sweep has a predetermined frequency (cycle). In the specification, this may be referred to as resonance). Therefore, the ultrasonic cleaning apparatus of the present invention can be an ultrasonic cleaning apparatus with extremely high cleaning capability because the control unit controls each sweep so that the liquid resonates.

Further, the sweep range of the ultrasonic oscillation frequency may be 3 kHz to 8 kHz.
Furthermore, the sweep cycle may be 100 Hz to 1000 Hz in terms of frequency.
It has been experimentally found that resonance occurs in these sweep ranges.

  According to the ultrasonic cleaning apparatus of the present invention, the entire liquid in the cleaning tank can be vibrated greatly, and extremely high cleaning performance can be exhibited.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a block diagram of the ultrasonic cleaning apparatus.
The ultrasonic cleaning apparatus 30 includes a cleaning tank 31 in which a cleaning liquid and an object to be cleaned are immersed, and has a vibrator 32 at the bottom 31 a of the cleaning tank 31. Further, the ultrasonic cleaning device 30 includes a drive circuit 34 for driving the vibrator 32.
The vibrator 32 has a function of receiving an electrical signal from the drive circuit 34 and generating mechanical vibration based on the electrical signal.

In the ultrasonic cleaning device 30 of the present embodiment, the ultrasonic frequency generated in the cleaning tank 31 is provided so as to be able to sweep in a range of at least 3 kHz to 8 kHz.
Further, the sweep period (frequency) is set to be sweepable in a range of at least 100 Hz to 1000 Hz.

In this way, the entire liquid in the cleaning tank 31 may vibrate greatly by sweeping the ultrasonic frequency in the range of 3 kHz to 8 kHz and further sweeping the frequency (frequency) of this sweep in the range of 100 Hz to 1000 Hz. found.
As described above, the entire liquid in the cleaning tank 31 vibrates greatly, thereby eliminating partial cleaning unevenness and extremely increasing the cleaning efficiency as a whole.

Hereinafter, the configuration of the drive circuit 34 that drives the vibrator 32 will be described.
The drive circuit 34 generates an electrical signal having a predetermined frequency from an alternating current 100 V or 200 V (50 Hz or 60 Hz) input from a commercial power supply and supplies the electrical signal to the vibrator 32.
The drive circuit 34 is provided with a power control unit 36 that performs power control of AC 100V or 200V input from a commercial power source. Examples of the power control unit 36 include a triac.

A rectifier circuit unit 38 is provided following the power control unit 36. The rectifier circuit unit 38 is configured by a bridge circuit or the like, and full-wave rectifies the input alternating current.
A smoothing circuit unit 40 is provided after the rectifying circuit unit 38. The smoothing circuit unit 40 mainly employs a large capacity capacitor or the like. The smoothing circuit unit 40 smoothes the full-wave rectified waveform to form a smooth waveform.

Further, a power amplifying unit 42 is provided after the smoothing circuit unit 40. The power amplifying unit 42 has a function of switching and outputting the rectified voltage to have a predetermined frequency. The switching frequency of the power amplifying unit 42 is controlled by a control unit 46 described later.
A phase correction unit 44 is provided following the power amplification unit 42. The phase correction unit 44 corrects a phase shift due to a reactance component of the vibrator 32.

Next, the control unit 46 will be described with reference to FIG.
The control part 46 is provided so that operation | movement of the ultrasonic cleaning apparatus 30 whole is controllable. The control unit 46 can control the sweep of the oscillation frequency of the vibrator 32 and the sweep of the sweep width.

  The control unit 46 includes a CPU 48, an oscillator 50, and a gate driver 52. The CPU 48 is connected to an operation unit 54 that can be operated by the user, and outputs a control signal to the oscillator 50 and the power control unit 36 so as to execute an operation specified by the user, thereby executing a predetermined operation. A DDS or the like is employed as the oscillator 50.

The operation unit 54 includes a first switch 54a that allows the user to select a sweep range of the ultrasonic oscillation frequency and a second switch 54b that allows the sweep period of the sweep range to be selected.
When the first switch 54a or the second switch 54b is operated in the operation unit 54, the CPU 48 of the control unit 46 sweeps the sweep range of the ultrasonic oscillation frequency within the range instructed by the first switch 54a. Thus, the oscillator 50 is controlled, and the oscillator 50 is controlled so that the sweep period of the oscillation frequency sweep falls within the range designated by the second switch 54b.

Therefore, in the power amplifying unit 42, the oscillation frequency is swept within the range designated by the first switch 54a, and the sweep cycle of the oscillation frequency sweep is within the range designated by the second switch 54b. The electrical signal output to the vibrator 32 is switched.
Thus, the user can select the sweep range of the oscillation frequency and the sweep cycle.

FIG. 3 shows in which range the resonance occurs when the ultrasonic wave is swept in a predetermined range and this sweep is swept in a predetermined cycle.
In addition, as the measurement conditions at this time, the washing tank 31 is made of stainless steel having a thickness of 1.5 mm, and the length, width, and depth are 600 mm.
The liquid in the cleaning tank 31 is pure water, and the liquid temperature is 35 ° C. The water level was set at a position 200 mm from the upper surface of the vibrator 32.
A portable ultrasonic sound pressure meter (model: HUS-5) manufactured by Honda Electronics Co., Ltd. was used as the sound pressure meter.

As shown in FIG. 3, when the sweep range of the ultrasonic wave was changed from 3 kHz to 8 kHz and the sweep period (frequency) of the sweep range was changed from 10 Hz to 1000 Hz, the maximum value and the minimum value of the sound pressure were measured. The measurement of the sound pressure in the ultrasonic sweep range was performed every 1 kHz. Moreover, the sweep period (frequency) was measured at 10 Hz, 20 Hz, and 50 Hz, and was measured at intervals of 100 Hz between 100 Hz and 1000 Hz.
As a result of the measurement, resonance occurred within the range of the thick frame in FIG. The resonance mentioned here means that the entire liquid vibrates greatly as described above. And the liquid surface is greatly rippled.

  Therefore, it was experimentally confirmed that the resonance occurs and the cleaning ability becomes extremely large by setting the ultrasonic sweep range to 3 kHz to 8 kHz and the sweep period (frequency) to 100 Hz to 1000 Hz.

  While the present invention has been described in detail with reference to a preferred embodiment, the present invention is not limited to this embodiment, and it goes without saying that many modifications can be made without departing from the spirit of the invention. .

It is a block diagram which shows the whole structure of the ultrasonic cleaning apparatus of this invention. It is a block diagram of a control part. 6 is a table showing changes in sound pressure and occurrence of resonance when an ultrasonic wave is swept within a predetermined range and this sweep is swept in a predetermined period.

Explanation of symbols

30 Ultrasonic cleaning device 31 Cleaning tank 31a Bottom 32 Vibrator 34 Drive circuit 36 Power control unit 38 Rectification circuit unit 40 Smoothing circuit unit 42 Power amplification unit 44 Phase correction unit 46 Control unit 48 CPU
50 Oscillator 52 Gate Driver 54 Operation Unit

Claims (3)

In the ultrasonic cleaning device that applies ultrasonic vibration to the liquid in the cleaning tank and cleans the object to be cleaned in the cleaning tank,
A control unit that sweeps the oscillation frequency of the ultrasonic wave within a predetermined frequency range and sweeps the oscillation frequency at a predetermined cycle so that the entire liquid in the cleaning tank vibrates greatly. An ultrasonic cleaning apparatus characterized by:   The ultrasonic cleaning apparatus according to claim 1, wherein the sweep range of the ultrasonic oscillation frequency is 3 kHz to 8 kHz.   The ultrasonic cleaning apparatus according to claim 1 or 2, wherein the frequency of the sweep is 100 Hz to 1000 Hz in terms of frequency.

Images