| 摘要 |
Ultrasonic apparatus comprises a centrally bolted ultrasonic transducer having passages for internal cooling by a stream of fluid such as air. Radial ducts in a metal back mass open into an enlarged portion of a first bolt hole adjacent the bolt for supplying air. Air then flows forward through an annular passage in the piezoelectric crystal means and enters an enlarged portion of a second bolt hole in a metal front mass from which it is discharged through radial ducts in the front mass. Both enlarged portions should be of oval shape to assure strength and rigidity. A housing can surround the transducer for externally cooling it with a stream of air. The transducer can be mounted on the housing by a perforate plate or flange.
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