JPH03224655A - Ultrasonic atomizer - Google Patents

Abstract

PURPOSE:To reduce the power loss of a vibration system and to easily fabricate and assemble parts by fixing a vibrator phone to a cylinder through two elastic bodies provided between the node parts at two positions of the phone and the cylinder. CONSTITUTION:An ultrasonic vibration is imparted to the vibrator phone 3 fixed in a cylinder 2 through an electro-acoustic transducer element 4. Besides, a liq. feed passage 7 is formed between the cylinder 2 and a sleeve member 6 screwed on the cylinder 2. A thread part 5 and an engaging part 5a are formed between the cylinder 2 and the member 6. A liq. is supplied to the atomization part 3a formed at the tip of the phone 3 by a nozzle part 7a. The phone 3 is fixed to the cylinder 2 through two elastic bodies 10 and 11 provided between the cylinder 2 and the node parts 9a and 9b at the two positions of the phone 3. Consequently, the power loss of the vibration system is reduced, and the parts are easily fabricated and assembled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention generally relates to a liquid substance such as a supplied liquid fuel (in this specification, liquid substance refers to a liquid such as a liquid fuel, as well as a liquid substance such as a liquid fuel). Regarding ultrasonic atomization devices for atomizing liquids (including liquid substances such as suspended solutions) using ultrasonic vibration, in particular (a) automobiles, outboard motors, and 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 foods, pharmaceuticals, agricultural chemicals, fertilizers, etc., temperature and humidity control sprays, baked powder sprayers (ceramic The present invention relates to an ultrasonic atomizer suitable for use in (e) 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. Further, a liquid storage portion is formed between the cylinder and the vibrator horn, and liquid is supplied from the tip nozzle portion to the entire circumference of the atomization surface of the vibrator horn.

[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.

Further, there are problems in that the cutting process of the flange requires high precision, which increases the cost, and that the flange needs to be tightened uniformly, resulting in poor assembly performance.

Furthermore, since a liquid reservoir is formed between the cylinder and the vibrator horn, increasing the clearance of the tip nozzle between the cylinder and the vibrator horn improves the stability of the spray amount, but The uniformity of the liquid supply distribution to the atomizing surface will decrease, and conversely, the clearance at the tip nozzle section will be reduced (this will improve the uniformity of the liquid supply distribution to the atomizing surface, but will reduce the stability of the spray amount) The reason why the stability of the spray amount decreases when the clearance at the tip nozzle is made smaller is that air bubbles are generated in the liquid reservoir due to the ultrasonic vibration of the vibrator horn, and these air bubbles are transferred to the tip nozzle. It is caused by gushing out from the body.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ultrasonic atomization device that solves the above problems and can reduce power loss in the vibration system and can be easily manufactured and assembled.

Another object of the present invention is to provide an ultrasonic atomizer that can reduce the clearance of the tip nozzle part to improve the uniformity of the liquid supply distribution to the atomization surface and the stability of the spray amount. It is.

[Means for solving the problem] For this purpose, the ultrasonic atomization device of the present invention includes a cylinder 2,
A vibrator horn 3 fixed in the cylinder, an electric/acoustic transducer 4 for imparting ultrasonic vibration to the vibrator horn, and a liquid supply path 7 screwed onto the outer periphery of the cylinder 2 and connected to the cylinder 2. a sleeve member 6 forming the cylinder 2 and the sleeve member 6, a threaded part 5 and a fitting part 5a formed between the cylinder 2 and the sleeve member 6, an atomizing part 3a formed at the tip of the vibrator horn, and the atomizing part Nozzle section 7a that supplies liquid to.

and two elastic bodies 10.1 provided between the two node portions 9a19b of the vibrator horn and the cylinder.
1, and the vibrator horn is fixed and supported on the cylinder by the elastic body.

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.

[Function] In the present invention, since the vibrator horn is fixed with elastic bodies at two node portions, the vibrator horn can be fixed and supported by the cylinder with flexibility, and the vibrator horn can be fixed and supported by the cylinder with flexibility. Since the sleeve member is fitted to the cylinder at the fitting part, the sleeve member is fitted to the cylinder at the fitting part.
The lag between the vibrator horn and the sleeve member can be easily achieved. In addition, since the liquid supply path is formed between the cylinder and the sleeve member and is not affected by the vibration of the vibrator horn, air bubbles do not occur as in the conventional case, and the spray amount remains stable even if the clearance is extremely small. do.

[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 comprised of a sleeve member 6 that is fitted at a flat fitting portion 5a and screwed together at 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. In this way, the liquid supply path 7 is formed between the cylinder 2 and the sleeve member 6,
Since there is no influence from the vibration of the vibrator horn 3, even if the clearance is extremely small, on the order of 0.05 to 0.1 cm, bubbles will not be generated as in the conventional case.

The vibrator horn 3 has a portion that does not vibrate, that is, two node portions 9a19b, and the inner circumferential surface of the cylinder 2 has two node portions 9a19b.
A groove is formed facing the node portion 9as9b, and an elastic body 10111 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 body 10, 11, and the vibrator horn 3 and the cylinder 2 can be easily expanded. Become. Further, the sleeve member 6 is
Since the fitting portion 5a is fitted into the cylinder 2, the vibrator horn 3 and the sleeve member 6 can be easily opened.

[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 for easy expansion between the vibrator horn and the cylinder, and since the sleeve member is fitted into the cylinder at the fitting portion, the expansion between the vibrator horn and the sleeve member can be easily achieved. Therefore, compared to the conventional case where the vibrator horn is fixed rigidly with a flange, the vibrator horn, cylinder, and sleeve member can be easily expanded, so cutting and assembling the vibrator horn can be easily performed. At the same time, the power loss of the vibration system can be reduced by about half.

In addition, since the liquid supply path is formed between the cylinder and the sleeve member and is not affected by the vibration of the vibrator horn, air bubbles do not occur as in the conventional case, and the spray amount remains stable even if the clearance is extremely small. do. Therefore, by reducing the clearance of the tip nozzle part, uniformity of liquid supply distribution to the atomization surface and stability of the spray amount can be achieved.

[Brief explanation of 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. 1... Ultrasonic atomization device, 2... Cylinder, 3...
Vibrator horn, 3a...Atomization part, 4...Electric/acoustic conversion element, 5...Threaded part, 5a fitting part, 6...Sleeve member, 7...Liquid supply path, 7a... Nozzle part, 9
a%9b...)-do part, 10, 1... Elastic body. Applicant Tonen Corporation

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 a liquid that is screwed onto the outer periphery of the cylinder and is connected to the cylinder. A sleeve member forming a supply path, a threaded part and a fitting part formed between the cylinder and the sleeve member, an atomizing part formed at the tip of the vibrator horn, and a liquid being supplied to the atomizing part. The vibrator horn is provided with a nozzle portion to be supplied, and two elastic bodies provided between two node portions of the vibrator horn and the cylinder, and the vibrator horn is fixed and supported on the cylinder by the elastic bodies. An ultrasonic atomization device featuring: