Abstract:
To solve the calorific problem of high power ultrasonic transducer, a new type of heat pipe composite piezoelectric ultrasonic transducer is presented and studied by simulation and experiment. Firstly, the axial temperature distribution inside the transducer with and without heat pipe under no-load condition are studied. Secondly, the influence of the coupled position, number and depth of the heat pipe on the resonance frequency and displacement amplitude of the transducer are investigated with finite element method. Finally, the relationship between the resonant frequency and dynamic capacitance of the heat-pipe-type piezoelectric transducer with and without heat pipe under a load of 400 W is investigated by using experimental methods. The results show that the heating of piezoelectric ceramics is the main factor for the heating of transducers. The internal temperature of the transducer can be greatly reduced by using heat pipe. Under the same working condition, the heat pipe can reduce the temperature of the transducer by 42.5%, and reduce the shift of resonant frequency and dynamic capacitance of the transducer by 73.5% and 59.5%, respectively.
