Transducer assembly, ultrasonic atomizer and fuel burner

An ultrasonic transducer including a first driver section and a second half-wavelength output section having a large diameter segment of length A extending from the driver section, a small diameter segment of length B extending from said large diameter segment, and a displacement antinode at the free end of the small diameter section comprising a flanged tip of thickness C, the improvement wherein A/B+C>1.

An ultrasonic transducer assembly including a front ultrasonic horn section, a rear ultrasonic horn section, a driving element having at least one piezoelectric disc sandwiched between the front and rear ultrasonic horn sections, means for clamping the front and rear ultrasonic horn sections against the driving element, and an output section extending from the front ultrasonic horn section and terminating in an atomizing surface, wherein the improvement comprises:

• annular sealing means of compressible elastomeric material surrounding the at least one piezoelectric disc between the front and rear ultrasonic horn sections, said sealing means having an inner periphery which, in the unstressed condition, conforms to the shape of but is slightly greater than the periphery of the piezoelectric disc, and the compression exerted by the clamping means being sufficient to provide good acoustic coupling between the driving element and the front and rear ultrasonic horn sections when the inner periphery of the sealing means lightly contacts the outer periphery of the piezoelectric disc.

A transducer assembly comprising:

• a first section including a rear ultrasonic horn having a flanged portion at one end thereof, a front ultrasonic horn having a flanged portion at one end thereof, a driving element comprising a pair of piezoelectric discs and an electrode positioned therebetween, said driving element being positioned between the flanged portions of said front and rear horns, and means for clamping the flanged portions of said front and rear horns in compression against said driving element, said first section having an empirically measured characteristic resonant frequency;
• and
• a second section including a large diameter portion of length A integrally formed with the front horn of said first section, a small diameter portion of length B extending from said large diameter portion, the interface between said large diameter and small diameter portions constituting a step for amplifying vibratory motion at said atomizing surface, said second section having a theoretical resonant frequency matching the empirical resonant frequency of said first section.