T type high power ultrasonic transducer

Abstract

The invention relates to a T-type superpower ultrasonic transducer. The T-type superpower ultrasonic transducer utilizes a longitudinal vibration piezoelectric ceramic vibrator to generate longitudinal vibration, stimulates a metal round vibration disc directly connected with the longitudinal vibration piezoelectric ceramic vibrator to generate the vibration of the same frequency, and radiates sound waves to media. With the help of the conversion of the vibration mode, flexural vibration is generated in the metal round vibration disc, effective conversion of the longitudinal vibration mode and the flexural vibration mode is achieved, uniformity of the radiation sound field of the transducer is greatly improved, radiation area of the transducer can be effectively increased, high-power working is realized, at the same time, radiation impedance of the transducer is improved, acoustic matching of the transducer is improved, and radiation efficiency of the transducer is improved. In addition, due to the fact that the flexural vibration disc has multiple vibration modes, the transducer can work in different vibration modes and radiate ultrasonic waves of different frequencies, and therefore an ultrasonic wave source working in multiple frequencies is formed.

Description

technical field [0001] The invention belongs to the technical field of research on generation or transmission equipment of ultrasonic frequency mechanical vibrations, and in particular relates to a T-shaped high-power ultrasonic transducer. Background technique [0002] In the field of power ultrasound and underwater acoustics, longitudinal vibration sandwich piezoelectric ceramic ultrasonic transducers, also known as Langevin transducers, are widely used, such as ultrasonic cleaning, ultrasonic metal and plastic welding, ultrasonic processing, etc. . Its structure is mainly to install a piezoelectric ceramic sheet in the middle of the prestressed bolt. One end of the prestressed bolt is provided with a metal front cover, and the other end is provided with a metal back cover. The structure of the front cover is a conical platform structure. This type of transducer has high electromechanical conversion efficiency and large power capacity. However, due to the theoretical and...

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Problems solved by technology

[0003] 1. The design theory of the longitudinal sandwich ultrasonic transducer requires that the transverse dimension of the transducer, that is, the diameter, cannot exceed a quarter of the wavelength of the sound wave radiated by the transducer, so the sound wave radiation area of ​​this type of transducer is limited The limitation of its own theory cannot exceed a certain limit, which greatly limits the acoustic radiation area and radiation power of this type of transducer

[0004] 2. For the sandwich-type longitudinal vibration piezoelectric ceramic ultrasonic transducer, due to the limitation of the radiation area, the sound intensity of the transducer is also very large under the condition of large radiation power, which leads to the vibration speed inside the transducer, The vibration displacement and longitudinal stress are also very large, sometimes exceeding the mechanical strength limit of the material, resulting in the fracture or damage of the transducer

[0005] In view of the above problems, in order to adapt to the rapid development of ultrasonic technology, it is necessary to develop a new type of power ultrasonic transducer to overcome some outstanding problems of the current sandwich-type longitudinal vibration ultrasonic transducer, that is, the limitation of radiation power and acoustic radiation area question

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