Ultrasonic Cleaner Home Built

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I'm building an ultrasonic cleaner from four 100 watt 28khz transducers and power drivers operating on 220 volts purchased from fleabay.

 

A few things learned on this journey, the metal used on the tank is 1.5mm to a maximum of 2mm, the cheap Chinese tanks as shown in the first image do not use the proper amount of transducers. A fellow form another forum modified his tank for optimal cleaning power by adding a few more transducers placed as you would find in a commercially used cleaning tanks last image.

 

Your tank should have a heater and never place parts to be cleaned directly on the bottom.

 

The 40khz and the 28khz transducers are the most commonly used for cleaning purposes with the latter being a bit more aggressive - larger cavitation bubbles creating larger implosions.

 

 

 

 

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What is the best frequency for ultrasonic cleaning

The level of frequency needed to properly clean an item depends on the type of the item and the contaminants that should be removed from it. The bubbles are bigger and the implosions are more powerful when the frequency is lower. On the other hand, the bubbles are smaller and the implosions are less powerful when the frequency is higher. Higher frequencies also produce more cavitation bubbles.

 

In industrial cleaning, the frequencies used are lower than 80 kHz. That is because the items are sturdy and the contaminants are plenty and big. The items can withstand the powerful implosions and the contaminants are easily removed by the big bubbles. When it comes to cleaning small and delicate items, the frequencies used are higher than 80 kHz. If the contaminants have different types and sizes, multiple frequencies should be used.

 

Use low frequency first to remove the large contaminants and then use high frequency to remove the smaller contaminants. The low frequency phase should last for a short period of time only. The high frequency phase should last long. This is the ideal way to clean items with varying types and sizes of contaminants. By not exposing an item to low frequency for a long period of time, cavitation erosion can be prevented.

 

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Interesting Share,

 

Large-Scale Electricity

Linking many separate crystals is another way to use piezoelectric energy, for the small charges from each crystal combine can create one large source of power.

Piezoelectric crystals are embedded in staircases and floor tiles in high-traffic areas like subway stations and sidewalks, and these individual generators are all linked. The system collects the energy as crowds of people walk through the area and generate force.

 

Piezoelectric energy is completely clean and renewable. With the development of the technology and the study methods, people will create systems that generate power at many different levels, the individual sources working together toward energy independence.

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Ultrasonic gun cleaning using UPC 40kHz system and a water based detergent

 

https://youtu.be/nOVUpenSvdw

Edited November 13, 2018 by bcgold

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The different ultrasonic frequencies

25 KHz - The most powerful frequency to remove strong pollution. Do NOT use on mirror polish surfaces and sensitive materials like glass, aluminum...

40 KHz - Standard frequency which can be compatible on a wide range of material and for removing a lot of pollution.

80 kHz - This frequency is used to clean parts with complex geometry. Cavitation bubbles can go into small holes to remove the pollution.

120 kHz and Megasonic - Main application in precision optics to clean very sensitive parts like wafers. The power of cavitation is low so these frequencies are used on clean parts to remove dust in final cleaning

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Space age adhesive, 3M™ Scotch-Weld™ Epoxy Adhesive DP420 is recommended to bond transducers to the cleaning tank.