Ultrasonic Transducer With Increased Exposure Power and Frequency up to 100 kHz.

Abstract

A new design of a high-frequency piezoelectric transducer with a power from 70 to 1800 W (designed for radiation into liquids and gases of ultrasonic (US) vibrations in the frequency range of 30,…,100 kHz) is proposed. It is based on the principle of summation on a diametrically vibrating summing plate of vibrations of radially mounted Langevin transducers. The method of their design was created and the optimal design dimensions of the transducers were established. This made it possible to manufacture and research practical designs of transducers at frequencies of 30 and 90 kHz. The created transducers together with disk radiators allowed creating US vibrations of 155 dB in the gas at a frequency of 31.67 kHz and 151 dB at a frequency of 92.82 kHz. In this case, the power of the generated vibrations was limited by existing radiators of disk form and a small wave resistance of gas. As a result, the transducers provided radiation up to 1800 W at a frequency of 31.67 kHz and up to 250 W at a frequency of 92.82 kHz of acoustic power. The transducer can be used at processing of liquids, such as dispersion, emulsification, extraction, degassing of liquids, sterilization, and homogenization. The transducer can be used for agglomeration of suspended dispersed particles in gases, drying of various materials, and liquid spraying when exposed to gases. There are no restrictions on the number of simultaneously operating transducers. However, the overall dimensions exclude tight packaging. Therefore, its use in any array with a wavelength-oriented separation is not possible.