A compact apparatus for atomisation of fluid samples comprises a sonotrode (11), placed so that an ultrasonic wave emitted by the sonotrode is directed through a channel (25) in a separate channel device (21) and reflected by from the interface (26) in a high-low impedance transition zone (Tz), so that a standing wave is formed within the channel. A positive air flow through the channel, driven by a pressure differential at each end of the channel, interacts with the working fluid or slurry being delivered by a fluid delivery device (30) to atomise it. The speed of the air flow and the dispersal, homogeneity, and size of particles in the slurry sample can be controlled by varying the shape of the channel outlet.

An ultrasonic water jet apparatus includes a water accumulation part in which the water supplied from a water supply source is temporarily accumulated, a jet port that jets the water accumulated in the water accumulation part, and a piezoelectric vibration plate including a dome part that is disposed opposed to the jet port in the water accumulation part and propagates the ultrasonic vibration to the water accumulated in the water accumulation part, a flange part that projects outward in the radial direction from a peripheral edge of the dome part, and an annular plate that projects outward in the radial direction from a peripheral edge of the flange part.

A secondary ultrasonic nebulisation device is disclosed comprising: a liquid sample delivery capillary; a sample receiving surface arranged for receiving a liquid sample from the capillary; and an ultrasonic transducer configured for oscillating the surface so as to nebulise the liquid sample received thereon, wherein the device is configured such that the oscillations of the surface by the ultrasonic transducer cause charged droplets and/or gas phase ions to be generated from the sample.

A spray coating module with multi-orifice passageways includes an ultrasonic vibrating unit having an ultrasonic horn, and a material feeding unit having a material inputting passageway, a plurality of material outputting passageways, a dividing passageway and a material outputting end surface. The dividing passageway communicates with the material inputting passageway and each material outputting passageway. The material inputting passageway has a material inputting orifice. Each material outputting passageway has a material outputting orifice formed on the material outputting end surface. The cross-sectional area of the material inputting orifice is larger than the sum of the cross-sectional areas of the material outputting orifices. A gap is kept between the material outputting end surface and the ultrasonic horn. As a result, the present invention is effectively prevented from the non-uniform material feeding condition of the traditional elongated material feeding unit and relatively better in spray coating uniformity.

Provided is a fluid supply unit (2), a micro-droplet ejection driving device (1) and a micro-droplet ejection generating device (4). The fluid supply unit (2) comprises a fluid ejecting portion (210) and an energy conducting sheet (220), the fluid ejecting portion (210) and the energy conducting sheet (220) constituting at least part of a container wall of a container to be injected with a fluid; the energy conducting sheet (220) is used in close contact with an end surface of a piezoelectric actuator (120) and is driven to generate vibrations, thereby causing the fluid to be ejected by means of the fluid ejecting portion so as to form a directional micro-droplet stream. The micro-droplet ejection driving device (1) comprises: a housing (110) in which the fluid supply unit (2) may be accommodated; the piezoelectric actuator (120), which is fixed on the housing (110) and which is configured to be in close contact with an outer wall of the fluid supply unit (2) and to drive the outer wall to vibrate. The micro-droplet ejection generating device (4) comprises the fluid supply unit (2) and the micro-droplet ejection driving device (1).

[Object] A liquid agent application device capable of adjusting the displacement amount of a diaphragm is provided. [Solution] The liquid agent application device 10 includes a diaphragm 12 that changes the internal volume of a liquid agent reservoir 11, and a drive unit 13 located on the diaphragm 12. The drive unit 13 includes a driving piezoelectric element 20 that vibrates in response to application of a drive voltage signal, and a horn 21 that vibrates together with the driving piezoelectric element 20.

An ultrasonic water jet apparatus includes a water accumulation part in which the water supplied from a water supply source is temporarily accumulated, a jet port that jets the water accumulated in the water accumulation part, and a piezoelectric vibration plate including a dome part that is disposed opposed to the jet port in the water accumulation part and propagates the ultrasonic vibration to the water accumulated in the water accumulation part, a flange part that projects outward in the radial direction from a peripheral edge of the dome part, and an annular plate that projects outward in the radial direction from a peripheral edge of the flange part.

An atomizing spray dryer employs one or more stages defined by ultrasonic transducers in close proximity to a liquid feed opening forming a path of an atomization flow for producing uniform droplets from a close tolerance with the transducer. The atomization flow exits a gap between the transducer and an outer edge of the opening, such that the passed liquid is responsive to an oscillation of the transducer for forming the droplets. A conical or other suitably shaped transducer engages a substantially round liquid feed opening. Subsequent stages may include a circular, ring, or other suitable shape aligned to receive the atomization flow from a circumference of the conical base, or may also take any suitable shape, preferably to receive droplets directed by the first stage.

A low-frequency ultrasonic atomizing device includes a piezoelectric vibrator, a horn, a secondary atomizing chamber, a gas-liquid valve end cover, a Laval-type valve core, a stepped valve core, and a gas-liquid valve body. The piezoelectric vibrator is glued onto the horn, and the gas-liquid valve end cap is connected to the gas-liquid valve body by a thread, while both the stepped valve core and the Laval-type valve core are installed within a cylindrical cavity of the valve body, an end of the Laval-type valve core being sleeved at an end of the stepped valve core. The horn and the secondary atomizing chamber, the secondary atomizing chamber and the gas-liquid valve end cover are connected by a double-head stud and a nut. The device achieves multi-stage atomization of droplets, which increases the atomization quantity of a spray device, the droplets being small, and also achieves long distance spraying.

An ultrasonic vibrator driving apparatus applies a sine-waveform alternating voltage as a drive voltage via a conversion circuit to an ultrasonic vibrator that has a unique resonance frequency. A first current detector that detects a first current that flows from the drive voltage generator to the conversion circuit and a second current detector that detects a second current that flows from the conversion circuit to the ultrasonic vibrator are included. A frequency controller performs control on the drive voltage generator to change the frequency of a square-waveform alternating voltage so that the difference between the first current and the second current is reduced or approaches a minimum.