Radial sandwich type spherical piezoelectric ceramic composite ultrasonic transducer and transduction method

Abstract

The invention belongs to the technical field of transducers, and relates to a radial sandwich type spherical piezoelectric ceramic composite ultrasonic transducer and a transduction method. The radialsandwich type spherical piezoelectric ceramic composite ultrasonic transducer comprises an inner spherical shell, a piezoelectric ceramic spherical shell and an outer spherical shell which are sequentially wrapped from inside to outside; a geometric dimension of the transducer is T = (R3-R2) / (R4-R2); the geometric dimension T is greater than 0 and less than 1; an inner radius R1 of the inner spherical shell is 15-60 mm; the thickness of the inner spherical shell, the thickness of the piezoelectric ceramic spherical shell and the thickness of the outer spherical shell are all 4-6 mm; and the outer spherical shell comprises two semispherical shells which are connected through a fixing ring or threads. The radial prestress of the transducer can be increased, and the power capacity of the transducer is improved; three-dimensional space omnibearing equal-amplitude uniform radiation of sound waves can be realized, the sound wave action range of the transducer is expanded, and the action distance of sound waves radiated by the transducer is increased.

Description

technical field [0001] The invention belongs to the technical field of transducers, and relates to a radial sandwich type spherical piezoelectric ceramic composite ultrasonic transducer and an energy conversion method. Background technique [0002] In the field of ultrasound and underwater acoustics, longitudinal vibration sandwich piezoelectric ceramic ultrasonic transducers (also known as Langevin transducers) have been widely used because of their simple structure and high electromechanical conversion efficiency. High and easy to optimize design, etc. However, with the wide application of power ultrasonic technology in the fields of chemical reaction, wastewater treatment, oil and gas field development, Chinese herbal medicine extraction, food industry and metal smelting, higher requirements are put forward for ultrasonic power and ultrasonic spatial range. The traditional sandwich-type longitudinal vibration transducer puts forward more stringent requirements, and also ...

AI Technical Summary

Problems solved by technology

[0003] To sum up, in order to meet the requirements of power and ultrasonic range in high-power ultrasonic processing technology, the traditional longitudinal vibration sandwich piezoelectric ceramic ultrasonic transducer has the following deficiencies: First, the sandwich longitudinal vibration ultrasonic transducer The design theory requires that the transverse dimension of the transducer should not exceed a quarter of the wavelength of the acoustic wave radiated by the transducer. Therefore, the acoustic radiation area of ​​this type of transducer is limited by its own theory and cannot exceed a certain limit, thus greatly limiting Second, the sandwich-type longitudinal vibration ultrasonic transducer can only realize the radiation of ultrasonic energy in a single degree of freedom direction, that is, the radiated energy of the transducer is basically along the direction of the transducer. The direction of the longitudinal axis cannot realize two-dimensional or three-dimensional space radiation of ultrasonic energy, which also limits the spatial range of ultrasonic energy.

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