| 摘要 |
The invention contains an overload protection arrangement in a device for applying ultrasound to liquids, which comprises a sound generator (source), to which an oscillating circuit is applied and which is to be protected against running dry, in a container which is to be filled with the liquid. There is a sensor which responds when the liquid level in the container drops below a prescribed value. It is provided to use the arrangement in inhalation apparatuses, in particular. In contrast to the state of the art, in which a minimum liquid level is maintained by float controllers or by turn-off electrodes bridged by the liquid, in accordance with the invention turning off is performed when there is a rise in the circuit quality of a resonant circuit, containing the sound generator, of the oscillating circuit. The mode of operation of this arrangement is independent of the possible corrosion of components, and thus very reliable. In addition, easy cleaning of the container to be filled with the liquid is enabled, since only the sound generator is arranged in the latter. <IMAGE>
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