DE1084501B - Sonication head for ultrasound treatment - Google Patents

Description

LIBRARY

OF THE GERMAN PATENT OFFICE

The invention relates to a sonication head for ultrasound treatment, consisting of one in one the coupling and the insulation serving liquid arranged in a housing, of the Liquid-enclosed piezoelectric oscillator.

For normal workshop operations, it is important to create sound heads that are proportionate to this are adapted to rough operation. The often used housings made of insulating materials have the Disadvantage that they often jump even with minor impact or shock loads and thus the Liquid comes out.

Furthermore, it has already been proposed to use a metal head in which the quartz directly is pressed onto the radiating plate or is cemented to it. The radiating plate can be used in the in general, however, cannot be dispensed with, since not every item to be treated is in direct contact with the quartz may kick. Furthermore, arrangements are known in which the transducer at a distance from the as Membrane formed floor is arranged, with a liquid between the transducer and the membrane is provided. The disadvantage of this device is the fact that it is especially at higher Services cannot be used because cavitation occurs in the liquid. The present invention has the task of creating a sonication head in which the disadvantages listed above are safely avoided and which delivers consistently high performance even with continuous operation. According to the invention this is achieved in that the piezoelectric oscillator is spaced apart from the wavelength by a small distance is arranged by the radiation plate, which is chosen so large that the surrounding the transducer Liquid can flow through the space.

Further details of the invention are explained in more detail with reference to the drawing.

In the figure, the transducer 1 is arranged in a housing 2, namely on the bottom via, for example, three spacers 3. The bottom 4 of the housing, measured at η · λ / 2 in its wall thickness, also forms one electrode, while on the rear side the Quartz is provided with a metal coating, which forms the second electrode. Furthermore, a box forming a cavity 5 is arranged on the rear side in a manner known per se. Undercuts 6 are provided laterally below the quartz in the direction of the floor or in the floor, which accommodate an air cushion so that the liquid, sonication head
for ultrasound treatment

Applicant:

Siemens-Schuckertwerke

Aktiengesellschaft, Berlin and Erlangen, Erlangen, Werner-von-Siemens-Str. 50

Dr. Paul Wenk, Erlangen, and Ulrich. Nündel, Nuremberg, have been named as inventors

for example transformer oil, can expand in the sounding head when heated.

Tests have shown that too thin a layer of liquid between the radiating plate and the Vibration generator 1 increases the risk that the vibration generator will be destroyed. A layer of liquid whose thickness is not small compared to the wavelength, on the other hand, sets under the same operating conditions the sound power that can be radiated down. It has been shown that when using transformer oil as a liquid that has a viscosity of 20 cSt at a temperature of 20 ° C, a distance of 0.07 mm, for example, is sufficient to ensure sufficient flow reach.

Claims (1)

Claim: Sonication head for ultrasound treatment, consisting of one in one of the coupling and the Liquid used for insulation is arranged in a housing and is enclosed on all sides by the liquid piezoelectric oscillator, characterized in that the piezoelectric oscillator is arranged at a small distance from the radiation plate compared to the wavelength, the however, it is chosen to be so large that the liquid surrounding the transducer flows through the space can. Considered publications:
Electrical engineering and mechanical engineering, 68th year, 1951, pp. 173 to 178. 1 sheet of drawings