High-power dumbbell rod type tubular longitudinal-radial compound vibration ultrasonic irradiator

Abstract

The invention relates to a high-power dumbbell rod type tubular longitudinal-radial compound vibration ultrasonic irradiator, comprising a metal tube, a dumbbell rod type amplitude transformer, a transducer and a seal waterproof jacket, wherein the amplitude transformer and the transducer are longitudinally vibrated; the ends of the metal tube are hermetically connected with the dumbbell rod type amplitude transformer; the amplitude transformer is composed of a first cylinder, a second variable cross-section body, a third thin cylinder, a fourth variable cross-section body and a fifth cylinder in a structure order; the first cylinder is connected with the transducer; the fifth cylinder is connected with the metal tube; a flange plate is arranged at a longitudinal vibration displacement amplitude nodal plane of the amplitude transformer and connected with the sealed waterproof jacket; the transducer is accommodated by the seal waterproof jacket; and the radial resonance frequency of the metal tube is equal to the longitudinal resonance frequency of the transducer and the dumbbell rod type amplitude transformer. According to the invention, the metal tube forms the all-directional ultrasonic irradiation towards inside the tube or outside the tube; the radial size of the metal tube is not limited by the radial size of the transducer; and under a same longitudinal stimulating frequency and same longitudinal stimulating displacement amplitude, the radial vibration is stronger.

Description

technical field [0001] The invention relates to an ultrasonic radiator, in particular to a high-power vertical-diameter composite vibration ultrasonic radiator for liquid treatment, focusing or omnidirectional ultrasonic radiation. Background technique [0002] With the wide application of ultrasonic technology in the fields of industry, chemical industry, environmental protection, pharmaceuticals, oil and gas field development, etc., higher requirements are put forward for the power ultrasonic vibration system: high efficiency, high power and continuous and stable operation. At present, in the field of high-power ultrasonic applications, longitudinal vibration sandwich piezoelectric transducers are the most widely used due to their advantages of high power density, high electromechanical conversion efficiency and stable performance. However, due to the limitations of the theory and structure of the longitudinal vibration sandwich piezoelectric transducer itself, there a...

AI Technical Summary

Problems solved by technology

[0010] (1) The radial vibration of the transducer is realized by the 3-1 coupling of the piezoelectric tube, and its transverse electromechanical coupling coefficient k 31 Smaller, so the electromechanical conversion efficiency of the transducer is lower

[0011] (2) The metal prestressed shell and the internal piezoelectric ceramic tube are nested together by the thermal expansion and contraction method to apply a unidirectional radial prestress from the outside to the inside of the piezoelectric ceramic tube. Control, the prestress is too small, the power capacity of the transducer is limited, the power density is small, and the prestress is too large, which will cause the piezoelectric ceramic tube to break

[0013] (1) The structure of the composite ultrasonic tube is relatively complicated, and its manufacturing process is more complicated than that of the traditional sandwich piezoelectric transducer

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