A vibrator assembly for mounting on the bottom wall of a tank including a three-part insulating support housing including an outer support housing portion in the form of a nut which is located underneath the wall, a cap and intermediate support housing portion which is mounted with the cap above the wall and with the intermediate support housing portion below the wall and which threadably receives the nut, an inner support housing portion which is held by the nut within the intermediate support housing portion, with the inner support housing portion being part of a subassembly which includes a rubber vibrator support and electrodes and a vibrator and a rubber sealing insert all held within the inner support housing portion of the insulating support support housing and sealed therein by the tightening of the nut onto the intermediate support housing portion.
Liquid impinges on two sides (15, 17) of a plate (11) of piezoelectric material, for the liquid to be exposed to ultrasonic waves by the plate (11) oscillating at ultrasonic frequency. An electric voltage is uniformly applied to the two sides (15, 17) of the plate (11) at its peripheral edge via annular contact plates (27). The contact plates (27) have resilient fingers (31) bent towards the plate (11) for transferring the voltage on the one hand and for uniformly clamping the plate (11) on the other. To prevent the liqui from short-circuiting the plate (11), a seal (21) is located at the periphery of the plate (11) and is compressed for tightness between the plate (11), and intermediate ring (25) and the contact plates (27). An upper and a lower annular disc (19, 23) serve for better sealing and clamping of the plate (11).
A method and a device for producing aerosols highly charged with liquid phase and with small droplets by using ultrasonic transmitters in which an ultrasonic transmitter oscillates in a plane parallel to, or in an inclined plane of 1.degree. to 20.degree. relative to, the surface level of the liquid. When several transmitters are used in a compact unit, each transmitter is seated in a recess and each individual transmitter oscillates in a plane parallel to, or in a plane inclined at 1.degree. to 20.degree. relative to, the plane of the surface level of the liquid. The aerosols can be used as raw material for pyrolysis, coating, the doping of substances and in medicine.
