Transducers Optional Digital Ultrasonic Generator box 600W-1200W 28K

New Dgital Ultrasonic Generator With 600W-1200W,28K/40K With Transducers Optional

What is an Ultrasonic Generator?

The central element of an ultrasonic cleaning system is the ultrasonic generator, the source that provides the electrical energy to the system's ultrasonic transducers. The job of ultrasonic generator is to receive and convert energy from the power source to the proper frequency, voltage, and amperage. Electrical current from the power line is transmitted at approximately 100 to 250 volts AC and a frequency of 50 or 60 Hz. The majority of ultrasonic cleaning systems require the ultrasonic generator to supply the ultrasonic transducer at a significantly higher voltage and the specific frequency intended for the ultrasonic cleaning system's operation.

Ultrasonic generator selection should be based on the specific cleaning requirements of the application so that the best results can be achieved. In addition to needing the power and frequency to match the transducer requirements, the cleaning tank must be able to accommodate the largest part to be cleaned. Additionally, the power, frequency, and the tank size must be appropriate for the type of contaminant and the mechanical strength of the parts involved in the cleaning application.

Thanks to technological advances, ultrasonic generators are capable of obtaining feedback from the transducers enabling them to maintain maximum ultrasonic cleaning results by adjusting frequency and power output. When necessary, ultrasonic generators can provide customized variations in waveform, which optimizes the ultrasonic cleaning capability, but at the same time decreases the likelihood of parts damage during cleaning.

The proper frequency is essential for effective ultrasonic cleaning. Low frequencies result in a cleaning solution with large, active cavitation bubbles. Since the cleaning action produced by low frequencies is more powerful, this method is best for sturdy components that will not be damaged with hard surfaces that are not susceptible to pitting. Mid-range frequencies produce smaller cavitation bubbles resulting in a gentler cleaning action. The highest frequency ranges are used for extremely delicate components such as medical components and electronic components.

When ultrasonic cleaning is required for an individual process involve the same types of parts, single frequency ultrasonic generators are typically used. Multi-frequency ultrasonic generators capable of producing numerous frequencies are also available for facilities that require ultrasonic parts cleaning for a variety of parts with differing characteristics.

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How the Generator Works

An ultrasonic generator uses 60 Hz electrical utility power to create frequencies ranging from about 20 kHz to the 1 MHz range. Some models can generate only a single or a few frequencies while others can produce a wide range. Different levels of power are also available. For multiple-frequency models, operators can select the frequency that is most appropriate for their cleaning application.

In addition to producing the high-frequency signal, ultrasonic generators control the signal to maximize cleaning performance. Generators may automatically adjust the signal to compensate for heavy or light loading of the cleaning tank and they may “sweep” the signal, varying the frequency slightly to eliminate resonance or standing waves in the cleaning tank. For example, when a generator is operating at 38 kHz, varying the frequency randomly between 36 and 40 kHz eliminates hot spots and tank resonance that could damage the parts to be cleaned.

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How Do Ultrasonic Cleaners Work?

A simple way that ultrasonic cleaners work is likening them to an automatic dishwasher, but with some added refinements. An automatic dishwasher, much the same as an ultrasonic cleaner, combines water and a detergent to remove grease, grime and other contaminants from objects being cleaned.

Applications for ultrasonic cleaners include cleaning precision optics and laboratory glassware. Instead of cleaning pots and pans and bowls, ultrasonic cleaners most often are used to clean various other metal and plastic products difficult or impossible to clean by other methods.

Components of an Ultrasonic Cleaner

• Tanks to hold the cleaning solution. Tanks should be of stainless steel; their volume depends on the size of objects being cleaned

• Ultrasonic transducers that create the cavitation and that are bonded to the bottom of the tank

• A generator to power the transducers

• Controls that range from a simple on-off switch to sophisticated microprocessors that govern cleaning time, sweep, pulse, degassing, temperature, ultrasonic frequency , ultrasonic power, auto safety shutoffs and other refinements. More on these below.

What Do Ultrasonic Transducers Do?

There are two basic types of transducers; piezoelectric (a.k.a. electrostrictive) or magnetostrictive, but their function is the same. They are excited by electric current provided by the ultrasonic cleaner's generator to vibrate at ultrasonic frequencies that cause the bottom (and sides as the case can also be) of the tank to vibrate and thus serve as a membrane. This vibration forms the vacuum bubbles that implode, (not explode) on contact with items in the ultrasonic cleaner tank thereby blasting loose and carrying away contaminants. There are also immersible transducers. Ultrasonic frequency is an important part of how ultrasonic cleaners work and is discussed next.

How to Choose an Ultrasonic Cleaner Frequency

Ultrasonic is typically defined as sound above the human range of hearing. Low frequencies such as 25,000 cycles per second or 25 kHz produce relatively large bubbles that implode more violently than those created at higher frequencies such as 37, 80 or 130 kHz that produce progressively gentle cleaning action. As an example, the radius of a cavitation bubble produced at 37 kHz is approximately 88 microns. At 80 kHz it is 41 microns.

As a bit of digression, the implosion of cavitation bubbles produce shock waves radiating from the site of the collapse and create temperatures in excess of 10,000°F and pressures in excess of 10,000 psi at the implosion site. Yet the process is so fast that there is little heat buildup and no damage to parts being cleaned. That said, one should never reach into an operating ultrasonic cleaner to check, reposition or remove parts for examination.

Removing gross contaminants from robust parts such as fabricated or cast metals requires lower frequency cleaners. Softer metals, plastics, and products with polished surfaces should be cleaned at higher frequencies. In addition to protecting polished surfaces smaller bubbles are better able to penetrate tight areas such as seams, crevices and blind holes. If you'd like more information on this particular topic check this article on selecting ultrasonic cleaner frequencies.

Our point is that purchasing decisions for an ultrasonic cleaner should be made on more than price.

Discount Policy:

If you are the first customer of Whale Cleen sonic, you will get US$50 coupon when your purcahse amount over US$500.More discount information,please contact our sales man for more detail.