JPH03224658A - Ultrasonic atomizer - Google Patents

Abstract

PURPOSE:To decrease the power loss of an oscillation system and to facilitate the execution of production and assembly by fixing and supporting an oscillator horn to a cylinder by two pieces of elastic bodies provided between node parts at two points of the oscillator horn and the cylinder. CONSTITUTION:Ultrasonic oscillations are imparted to the oscillator horn 3 fixed in the cylinder 2 by an electro-acoustic transducer element 4. Liquid is supplied by a nozzle part 7a to an atomizing part 3a formed at the tip of the oscillator horn 3. Further, the oscillator horn 3 is fixed and supported to be cylinder 2 by two pieces of elastic bodies 10, 11 provided between the node parts 9a, 9b at two points of the oscillator horn 3 and the cylinder 2. As a result, the power loss of the oscillation system is decreased and the execution of the production and assembly is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention generally relates to a liquid substance such as a liquid fuel that is supplied (in this specification, liquid substance refers to a liquid such as a liquid fuel, or (Used to include liquid substances such as cloudy solutions.) Using ultrasonic vibration, it is used to atomize ultrasonic atomizers, particularly (a) automobiles, outboard motors, portable power devices, Ultrasonic atomizers applied to internal combustion engines used in the drive devices of consumer heat pump devices, etc.; (b) fuel injection nozzles for gas turbines; (c) boilers and heating furnaces for industrial, commercial and domestic use; Heating burners, (d) Industrial liquid sprayers, such as drying sprayers for drying liquid materials such as food, pharmaceuticals, agricultural chemicals, fertilizers, etc., temperature and humidity control sprays, baked powder sprayers (ceramic granulation) , a spray coating device, a reaction accelerator, and (e) an ultrasonic atomizer suitable for use in non-industrial liquid sprayers, such as pesticide sprayers, disinfectant sprayers, etc.

[Prior Art] As an ultrasonic atomizer that uses ultrasonic waves to atomize a liquid substance into extremely small droplet sizes, for example, a vibrator horn is disposed within a cylinder, and a A system is known in which liquid is supplied from a tip nozzle portion to the entire circumference of the atomizing surface at the tip of a vibrator horn to atomize the liquid.

Conventionally, in the above method, a fixing flange is formed integrally with the node portion of the vibrator horn, and the flange is fixed and supported on the cylinder.

[Problems to be Solved by the Invention] Theoretically, there is a point where the node portion of the vibrator horn does not cause power loss even if it is fixed. However, in reality,
Since the fixing flange has a width rather than a point, and also because the speed of sound differs even if the material is the same, the positions of the respective node portions will differ even if vibrator horns are manufactured with the same dimensions. As a result, there is a problem in that vibration occurs in the flange portion, resulting in a corresponding power loss in the vibration system.

Furthermore, the cutting process of the flange requires high precision, which increases the cost, and the need to uniformly tighten the flange causes problems such as poor assembly performance.

The present invention solves the above problems, and aims to provide an ultrasonic atomization device that can reduce power loss in the vibration system and can be easily manufactured and assembled.

Means for Solving the Problems] To this end, the ultrasonic atomization device of the present invention includes a cylinder 2,
A vibrator horn 3 fixed in the cylinder, an electric acoustic transducer element 4 that applies ultrasonic vibration to the vibrator horn, and an atomizing section 3a formed at the tip of the vibrator horn.
, a nozzle section 7a that supplies liquid to the atomizing section, and two elastic bodies 10.1 provided between the cylinder and the two nozzle sections 9a't9b of the vibrator horn.
1, and the vibrator horn is fixed and supported on the cylinder by an O-ring or the like made of an elastic body such as fluororubber or silicone rubber.

Note that the numbers added to the above configurations are for comparison with the drawings, and the configurations of the present invention are not limited thereby.

[Operations] In the present invention, since the vibrator horn is fixed by elastic bodies at two node portions, the vibrator horn can be fixed and supported by the cylinder with flexibility.

[Example code] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial cross-sectional view showing one embodiment of the ultrasonic atomization device of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG.

The ultrasonic atomizer 1 includes a cylinder 2, a vibrator horn 3 fixed and supported within the cylinder 2, an electric/acoustic transducer 4 that applies ultrasonic vibration to the vibrator horn 3, and an outer circumference of the cylinder 2. It is composed of a sleeve member 6 that is screwed together with a threaded portion 5. An annular liquid supply path 7 is formed between the cylinder 2 and the sleeve member 6, and liquid is supplied to the liquid supply path 7 from a liquid supply pipe 8.

An atomizing section 3a is formed at the tip of the vibrator horn 3. The shape of the atomizing portion 3a may be a hemispherical shape as shown in the figure, an enlarged diameter shape, or a butt shape. Further, an annular nozzle portion 7a is formed between the cylinder 2 and the sleeve member 6,
The liquid is supplied from the nozzle section 7a to the atomizing section 3a and is atomized into fine droplets by ultrasonic vibration.

The vibrator horn 3 has a non-vibrating portion, that is, two node portions 9a and 9b, and the inner peripheral surface of the cylinder 2 has a node portion 9a, 9b.
A groove is formed facing the node portions sa, 9b, and an elastic body 10.11 made of an O-ring is fitted into the groove. Therefore, when the vibrator horn 3 is inserted into the cylinder 2, the vibrator horn 3 is fixedly supported by the elastic bodies 10 and 11.

FIG. 3 shows another embodiment of the ultrasonic atomization device of the present invention. The difference from the above embodiment is that a groove 12 is formed in the node portion 9b of the vibrator horn 3 on the side closer to the electro-acoustic conversion element 4, and an elastic body 11 made of an OIJ song is fitted into the groove 12. It is a point. Since the stress acting on the node portion 9b on the side closer to the electro-acoustic conversion element 4 is smaller than that on the node portion 9a, even if the groove 12 is formed in the vibrator horn 3, there is no influence of stress.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made.

For example, in the above embodiment, the liquid supply path 7 is formed between the cylinder 2 and the sleeve member 6, but the sleeve member 6 is eliminated and the liquid supply path is formed between the cylinder 2 and the vibrator horn 3. may be formed.

[Effects of the Invention] As described above, according to the present invention, since the vibrator horn is fixed by elastic bodies at two node portions, the vibrator horn can be fixed and supported by the cylinder with flexibility. This allows the power loss of the vibration system to be reduced to about half compared to the conventional case of rigidly fixing with a flange, and the cutting and assembly of the vibrator horn can be easily performed.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing one embodiment of the ultrasonic atomization device of the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG.
The figure is a partially sectional view showing another embodiment of the ultrasonic atomization device of the present invention. 1... Ultrasonic atomization device, 2... Cylinder, 3...
Vibrator horn, 3a... Atomization part, 4... Electric/acoustic conversion element, 7a... Nozzle part, 9a1 9b... Node part, 1 0.11... Elastic body.

Claims (1)

[Claims] (1) A cylinder, a vibrator horn fixed in the cylinder, an electric/acoustic transducer that applies ultrasonic vibration to the vibrator horn, and an atomizer formed at the tip of the vibrator horn. , a nozzle section that supplies liquid to the atomization section;
An ultrasonic wave characterized by having two elastic bodies provided between two node portions of the vibrator horn and the cylinder, and fixing and supporting the vibrator horn to the cylinder by the elastic bodies. Atomization device.