Study Ultrasonic In The Cleaning Technology

Ultrasound technology appeared in the early twentieth century. Nearly a century's development has shown that ultrasound technology is the most active part in the acoustic development. Now it has penetrated into the building of national defense, national economy, people's livelihood, and science and technology fields. Of all these, ultrasonic cleaning technology has been extensively developed. Compared with a variety of other cleaning measures, ultrasonic cleaning has shown significant advantages. High efficiency and high cleanliness of ultrasonic cleaning machines derive from its penetrability and shock wave of air when the sound is communicated in the medium. So it is easy to clean those parts with complex shapes, inner cavity and stomas. The physical mechanism of Ultrasonic cleaning is ultrasound shock wave of air. In order to achieve good results, acoustic parameters and the physical and chemical properties of appropriate cleaning agentia must be selected. The higher the sound intensity is, the stronger shock wave of air is. But when the sound intensity reached a certain value, shock wave of air intends to saturation. Ultrasonic cleaning machines is mainly made up of ultrasonic generator and ultrasonic transducer. The paper focuses on ultrasonic Generator.This paper covers the following several aspects:1 .Main circuit research, including main inverter circuits, the protection of switch valves, the driver of power tubes and design of high frequency power transformers, namely, input circuits (including input protection circuits, rectifier filter circuits), the half-bridge inverter circuits (ultra - Audio circuit) and matching circuit (inductance match). On the one hand, the main circuit design can meet the demand of producing ultrasound frequency signals and the best match. On the other hand, it can protect the generators when a too small or too large power grid voltage is input. The design of half-bridge inverter drive circuits used in this paper is integrated half-bridge drive IR21844 from IR Corporation. In this way We can avoid designing driven transformers, simplify the designing steps, and can reduce components, saving cost.2.the research of transducer-matching network: The paper introduces a couple of common matching networks and selects inductance match networks according to practical requirements. During the course of designing matched inductance parameters, we accurately measures the electrical parameters of the equivalent circuits in the tank with loads through an impedance analyzer and work out the value of matched inductance using mathematical formula.3. control circuits of automatic frequency tracking. The paper takes the method of PLL. The PLL is made up of integrated digital PLL CD4046 and less independent components. Thus, the reliability of automatic frequency tracking is improved.4.design of digital PWM signal generator. The signal generator is using direct digital synthesis technology (DDS technology). It can greatly improve the resolution, effectively reduce costs and reduce the volume.