Ultrasonic cleaning technology is a non-destructive, high-precision, safe and reliable, energy-saving, and has been widely used in various industries of industrial cleaning technology, the invention can effectively remove micro-and nano-sized particulate pollutants deposited on the surface of precision mechanical components such as components and semiconductors. The realization of this technique is mainly based on the cavitation effect of ultrasonic waves. With the extensive use of ultrasonic cleaning, the cleaning effect is also an important point to consider the use of ultrasonic cleaning technology, today let us together to understand a variety of factors affecting the effect of ultrasonic cleaning.
(1) temperature
The temperature of the cleaning solution has a great influence on the cleaning effect. When the temperature of the cleaning solution increases, the number of cavities increases, which is beneficial to the formation of cavities. But when the temperature is too high, the vapor pressure in the bubble increases, and the cavitation intensity will decrease. All kinds of media have a cavitation active temperature, such as water cleaning solution cavitation active temperature is 60 ° C, so 60 ° C water is more suitable for the cleaning solution.
(2) pressure
When the cleaning fluid pressure is large, it is not easy to produce holes, so ultrasonic cleaning is carried out in open containers and closed pressure vessels in the performance is poor.
(3) flow rate of cleaning fluid
The process of cavity growth and collapse can be fully completed when the liquid is still and motionless, when the velocity of the cleaning fluid is too high, some cavity cores leave the cleaning surface before the whole process of growth and collapse is completed. Sometimes to avoid the deposition of dirt to the surface has been cleaned, I hope the cleaning fluid flow is updated, but at this time the flow rate of cleaning fluid can not be too fast to avoid reducing the efficiency of cleaning.
(4) the gas content in the cleaning solution
The presence of large air bubbles in the cleaning solution with non-cavitating nuclei will adversely affect the ultrasonic propagation and cavitating strength, so the gas content in the cleaning solution needs to be reduced. Some ultrasonic cleaning equipment has degassing function. Before cleaning, the power level below the cavitation threshold is vibrated, and the air is degassed by pulse or intermittent vibration, and then the power is raised to the normal power level for ultrasonic cleaning.
(5) acoustic characteristics of the cleaning object
Sound-absorbing objects such as rubber, and cloth, such as poor cleaning effect with ultrasonic, and strong reflection of the sound of materials such as metal, glass products cleaning effect is better.
(6) pay attention to the inhomogeneity of the effect caused by the reflection of the ultrasonic wave
When Sonication on an object with an inner or outer surface, ultrasonic waves are applied to clean the inner surface of the object, such as the inner surface of a metal pipe, the concave surface in the deep part of the metal object, and the container made of the metal net for cleaning object will reflect and hinder the transmission of ultrasonic wave, which will cause the Sonication uneven and affect the ultrasonic cleaning effect. This is a problem often encountered in ultrasonic cleaning of objects with complex external structures.
(7) pay attention to the damage and destruction of the cavity to the cleaning object
The strong action of holes sometimes damages and deteriorates the performance of cleaning objects, such as ultrasonic treatment of sharp-edged knives and extremely thin sheets of metal used in electronics and machinery, things that cause damage happens all the time. Because the lower the frequency, the stronger the ultrasonic cavity effect is. Therefore, in the use of ultrasonic cleaning to clean the shape of the object, the nature of the material, and the use of ultrasonic frequency should be carefully considered, to minimize unnecessary negative effects.
These are all kinds of factors on the effect of ultrasonic cleaning, to achieve a better cleaning effect, we should formulate the cleaning process should take into account all aspects of the factors.
