1.What is ultrasound:

The so-called ultrasound refers to sound waves that cannot be heard by the human ear. Normal human hearing can hear16-20kilohertz(KHZ)The sound waves are below16The sound waves at kilohertz are called infrasound waves or subsonic waves, exceeding20The kilohertz sound waves are called ultrasonic waves.

2.Generation of ultrasonic waves:

The two main parameters of ultrasound: .

frequency: Fthree20KHz;

power density: p=transmit power(w)/Launch area(cm2) ;usuallyp≥0.3w/cm2.

Ultrasonic waves propagating in liquids can clean dirt on the surface of objects, and its principle can be explained by the phenomenon of "cavitation":When the sound wave pressure of ultrasonic vibration propagating in liquid reaches one atmosphere, its power density is0.35w/ cm2,At this point, the peak pressure of the ultrasonic wave can reach vacuum or negative pressure, but in reality, there is no negative pressure present. Therefore, a large pressure is generated in the liquid, which breaks the liquid molecules into voids-Cavitation nucleus. This cavity is very close to vacuum, and it reaches a reverse pressure of ultrasonic waves*When it ruptures, the strong impact generated by the rupture hits the dirt on the surface of the object. The shock wave phenomenon generated by the rupture of countless small cavitation bubbles is called the "cavitation" phenomenon. The principle of ultrasonic cleaning technology.

3.Ultrasonic cavitation effect, ultrasonic cleaning effect and related parameters:

a.Cleaning medium:Using ultrasonic cleaning, there are generally two types of cleaning agents available:Organic cleaning agents and water-based cleaning agents. The cleaning medium is a chemical process, while ultrasonic cleaning is a physical process, combining the two effects,To thoroughly and thoroughly clean the object.

b.power density:The higher the power density of ultrasound, the stronger the cavitation effect, the faster the speed, and the better the cleaning effect. For precise and highly polished objects, prolonged high-power density cleaning can cause "cavitation" corrosion on the surface of the object.

c.ultrasonic frequency:The lower the ultrasonic frequency, the easier it is to generate cavitation in the liquid and the stronger the effect. High frequency results in strong directionality of ultrasonic waves, making them suitable for fine object cleaning.

d. -Generally speaking,Ultrasonic waves are present30oC-40oCSpatiotemporal effect*Okay. The higher the temperature of the cleaning agent,The more significant the effect. Usually used in practical applications for ultrasonic cleaning,adopt30oC-60oCThe working temperature.

4.Characteristics of Ultrasonic Cleaning:

Ultrasonic cleaning technology "refers to the use of ultrasonic cavitation to impact and peel off dirt on the surface of objects,To achieve the purpose of cleaning. It has the characteristics of high cleaning cleanliness and fast cleaning speed. Especially for blind holes and various geometric objects,*There is a cleaning effect that cannot be achieved by other cleaning methods.

5Comparison between Ultrasonic Cleaning and Other Cleaning Methods