Compound Drive Piezoelectric Ultrasonic Tubular Transducer

Abstract

The invention provides a compound drive piezoelectric ultrasonic-pipe-shaped transducer and relates to the field of transducers. The compound drive piezoelectric ultrasonic-pipe-shaped transducer comprises a round-pipe-shaped metal shell, a prestress applying device, inner end vibration matching blocks, outer end vibration matching blocks and piezoelectric crystal stacks. At least three sets of piezoelectric crystal stacks are arranged. Each piezoelectric crystal stack comprises an odds number of metal electrode plates and an even number of piezoelectric ceramic crystals, wherein the metal electrode plates and the piezoelectric ceramic crystals are stacked at intervals. The adjacent electrode plates are connected with electrodes opposite in polarity. The prestress applying device comprises a center supporting block and screws. Columnar protrusions are arranged on the circumferential face of the center supporting block, wherein the number of the columnar protrusions is the same as that of the piezoelectric crystal stacks. An inserting hole is formed in each columnar protrusion. A threaded hole is formed in one end of each inner end vibration matching block, and the other end of each inner end vibration matching block is in butt joint with one end of the corresponding set of piezoelectric crystal stack. One end of each outer end vibration matching block is fixedly connected with the shell, and the other end of each outer end vibration matching block is fixedly connected with the other end of the corresponding piezoelectric crystal stack. One end of each screw stretches in the corresponding inserting hole, and the other end of each screw is in threaded connection with a threaded hole. The technical problem that the power of an existing transducer is low is solved.

Description

technical field [0001] The invention relates to the field of transducers, in particular to a compound-driven piezoelectric ultrasonic tubular transducer. Background technique [0002] The function of the ultrasonic transducer is to convert the input electrical power into mechanical power (that is, ultrasonic waves) and then transmit it out, while consuming a small part of the power itself. [0003] With the continuous innovation of ultrasonic technology and the continuous improvement of application level, power ultrasonic has been widely used in industrial and agricultural production, medical and health, biopharmaceutical and food processing and other fields. Ultrasonic transducer is the core component of ultrasonic processing equipment, and its performance directly determines the application effect of power ultrasound. [0004] At present, the transducers widely used in ultrasonic processing equipment are longitudinal vibration sandwich piezoelectric transducers. This is ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a composite drive piezoelectric ultrasonic tubular transducer to solve the problem of the longitudinal vibration sandwich piezoelectric ultrasonic transducer in the prior art due to limited power capacity, small sound radiation area, and single sound wave action direction. , and the technical problems that the prestress on the piezoelectric ceramic tube of the radial vibration sandwich transducer is difficult to control and the electrodes are easy to fall off

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