JPS6341091Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an ultrasonic atomizer with a horn, and in particular achieves uniformity of liquid particles when a resonance plate integrally formed on the small end face side of the horn is caused to vibrate in a bending manner. Regarding the improvement of the structure for.

A piezoelectric vibrator was fixed to the large end face of a conical truncated horn prior to the inventor of the present invention, and the small end face of the horn had a resonating plate formed integrally with the horn, and the resonating plate suppressed bending vibration. An ultrasonic atomizer with a horn has been proposed, which includes a piezoelectric transducer that performs the resonator plate operation, and a liquid introduction pipe that supplies the liquid to be atomized to the acting surface of the resonant plate. In this case, one end of the liquid introduction tube is connected to a metering pump or the like, and the pump applies pressure to the supplied liquid to cause the liquid to be atomized to be atomized from the tip of the liquid introduction tube onto the acting surface of the resonance plate. At this time, if the surface tension or viscosity of the liquid is low, a portion of the liquid will drop downward before it is atomized, making it impossible to obtain liquid particles with a uniform particle size. In other words, normally in such a horn-equipped ultrasonic atomizer, the atomized particles are sent out in a predetermined direction by forced air blowing on the resonant plate working surface, but the atomized particles are not atomized and are not atomized on the resonant plate. This is because the particles dropped from the container will also be scattered by the blast of air. Particularly when used in a kerosene combustor, droplets falling from the resonance plate may enter the combustion chamber, causing incomplete combustion.

In view of the above points, the present invention prevents liquid from dripping from the working surface by forming a recess or a convex part in the center of the working surface of the resonator plate that is integrally formed with the conical truncated horn. It is an object of the present invention to provide an ultrasonic atomizer with a horn that can uniformize generated liquid particles.

Embodiments of the horn-equipped ultrasonic atomizer according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the invention. In this figure, the ultrasonic vibrator 1 as a piezoelectric transducer is
A truncated conical horn 3 having a large end face and a small end face on the central axis thereof, and integrally having a resonating plate 2 in the form of a disc or a square plate on the small end face side, and a piezoelectric vibrator 4 bonded to the large end face. It consists of This ultrasonic vibrator 1
A liquid introduction pipe 5 made of copper or the like is provided to supply liquid to the tank. The tip of this liquid introduction tube 5 is connected to the resonance plate 2.
The other end is connected to a metering pump or the like to apply pressure to the supplied liquid so that the liquid hits the resonance plate 2. Here, the ultrasonic vibrator 1 causes the piezoelectric vibrator 4 to bend and vibrate, transmits this vibration energy to the tip of the horn, and transmits the vibration energy to the resonator plate 2.
The vibration system is caused to vibrate by bending, and the vibration system is made to match the resonance frequency of the resonance plate 2. In this case, since the resonant plate 2 is bending and vibrating, the atomizing force is stronger at the periphery of the working surface 6 and weaker at the center.
Therefore, a recess 7 is formed in the center of the working surface 6 of the resonator plate 2 to serve as a liquid reservoir to prevent the liquid from falling.
In addition, although the ultrasonic vibrating body 1 has an axial length smaller than 1/2 wavelength and does not have a nodal point (nodal point of vibration), by elastically supporting it at its mass center of gravity, efficiency can be maintained without decreasing. The ultrasonic vibrator 1 can be supported. Here, a support groove 10 is formed at a position where a plane perpendicular to the central axis of the horn 3 and passing through the mass center of gravity intersects with the outer circumferential surface of the horn, a metal fixing plate 12 erected on the case 11 is fitted into the support groove 10, and An elastic retaining ring 13 is fitted into the support groove 10 to prevent the metal fixing plate 12 from coming off the support groove 10. Note that air is usually forced in the direction of arrow X to send out atomized particles.

In the above configuration, the piezoelectric vibrator 4 has an excitation power source 2
When a high frequency voltage of 0 is applied to cause the piezoelectric vibrator 4 to bend and vibrate, the vibration energy is amplified and transmitted to the tip of the horn 3, and the resonance plate 2 performs the amplified bending vibration to introduce the liquid. The liquid supplied from the pipe 5 to the working surface 6 is atomized. At this time, since the recess 7 is formed in the center of the working surface, the liquid before atomization does not fall and remains in the center.

According to the first embodiment, the working surface 6 of the resonance plate 2
The concave portion 7 can easily prevent the un-atomized liquid from dripping, and the generated liquid particles can be made uniform. In addition, the resonance plate action surface 6 with a small amplitude
Since the concave portion 7 is located in the center of the piezoelectric vibrator 4, there is an advantage that even if a liquid pool is formed, the change in impedance of the piezoelectric vibrator 4 is small.

FIG. 2 shows a second embodiment of the invention. In this figure, a convex portion 30 is formed on the working surface 6 of the resonator plate 2, which is formed on the small end surface side of the conical truncated horn 3, and serves as a liquid reservoir to prevent liquid from falling. Note that the other configurations are the same as in the first embodiment. This second
Also in the embodiment, by providing the convex portion 30, it is possible to easily prevent the liquid before atomization from dripping, and to make the generated liquefied particles uniform.

As mentioned above, according to the present invention, by forming a concave or convex portion in the center of the working surface of the resonating plate integrally formed with the horn, it is possible to prevent liquid from dripping from the working surface of the resonating plate. It is possible to obtain an ultrasonic atomizer with a horn that can uniformize the liquefied particles, and particularly when used in a kerosene combustor, there is an advantage that kerosene can be stably atomized.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the first embodiment of the horn-equipped ultrasonic atomizer according to the present invention, and FIG.
It is a side view showing an example. DESCRIPTION OF SYMBOLS 1... Ultrasonic vibrator, 2... Resonance plate, 3... Horn, 4... Piezoelectric vibrator, 5... Liquid introduction tube, 6...
...Action surface, 7... Concave portion, 30... Convex portion.

Claims (1)

[Scope of utility model registration request] A piezoelectric vibrator that bends and vibrates is fixed to the large end face of a truncated conical horn with no nodal point of vibration, and a resonator is formed integrally with the horn on the small end face of the horn. Hold a board;
An ultrasonic atomizer with a horn, comprising a piezoelectric transducer in which the resonant plate bends and vibrates, and a liquid introduction pipe for supplying a liquid to be atomized to the resonant plate working surface, An ultrasonic atomizer with a horn, characterized in that a concave or convex portion is formed in the center.