JPH03174268A - Ultrasonic atomizer - Google Patents

Abstract

PURPOSE:To reduce a clearance at a tip nozzle part and to uniformize the distribution of the liq. to be supplied on an atomization surface by sending the bubbles generated in a liq. storage part by ultrasonic vibration upward through the storage part and discharging the bubbles into the atmosphere through an air discharge pipe. CONSTITUTION:A vibrator phone 3 is engaged in a cylinder 2, and the phone 3 is ultrasonically vibrated by an electro-acoustic transducing element 8. The liq. storage part 5 and the nozzle part 7 are formed between the cylinder 2 and the phone 3. The nozzle part 7 is arranged downward from the horizontal direction. The air discharge pipe 9 for communicating the storage part 5 with the outside is provided to the cylinder 2. Namely, the bubbles generated in the storage part 5 are sent upward through the storage part 5 and discharged into the atmosphere through an opening 2a and the discharge pipe 9, and hence the bubbles are not blown out of the nozzle part 7. Consequently, the clearance at the nozzle part is reduced, the distribution of the liq. to be supplied on the atomization surface is uniformized, and the atomization amt. is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention generally relates to a liquid substance such as a liquid fuel (in this specification, a liquid substance refers to a liquid such as a liquid fuel, but also a liquid substance such as a liquid fuel). (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 foods, pharmaceuticals, agricultural chemicals, fertilizers, etc., temperature and humidity control sprays, and sprayers for hot sake powder (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.

[Conventional technology]

Until now, in internal combustion engines such as gasoline engines and diesel engines, or external combustion engines such as boilers and fan heaters, when burning the supplied liquid fuel, from the viewpoint of combustion performance, the liquid fuel It is desirable to supply the liquid by atomizing it into extremely small droplet sizes. In particular, in internal combustion engines such as gasoline engines and diesel engines, in order to obtain favorable engine performance, the liquid substance injected into the intake pipe, that is, the liquid fuel, is atomized into extremely small droplet sizes and mixed with air. It is required to supply the combustion chamber of the engine.

BACKGROUND ART Conventionally, an ultrasonic atomization device that atomizes supplied liquid fuel using ultrasonic waves is known as such a device that atomizes liquid fuel into extremely small droplet size. For example, a vibrator horn is disposed inside a cylinder, a liquid reservoir is formed between the cylinder and the vibrator horn, and the liquid is supplied from the tip nozzle to the entire circumference of the atomizing surface of the vibrator horn. It atomizes the particles.

[Problem to be solved by the invention]

In the above-mentioned ultrasonic atomization device, it is important to uniformly supply and distribute the liquid to the atomization surface and to maintain a stable spray amount. However, increasing the clearance at the tip nozzle between the cylinder and the vibrator horn improves the stability of the spray amount, but reduces the uniformity of the liquid supply distribution to the atomization surface; If the clearance is made smaller, the uniformity of the liquid supply distribution to the atomization surface will improve, but there is a problem in that the stability of the spray lff1 will decrease. The reason why the stability of the spray amount decreases when the clearance of the tip nozzle is reduced is that air bubbles are generated in the liquid reservoir due to the ultrasonic vibration of the vibrator horn, and these bubbles are ejected from the tip nozzle. .

The present invention is an ultrasonic atomizer that solves the above problem, and is capable of reducing the clearance of the tip nozzle part to achieve uniformity of liquid supply distribution to the atomization surface and stability of the spray amount. The purpose is to provide

[Means to solve the problem]

For this purpose, the ultrasonic atomization device of the present invention includes a cylinder 2,
A vibrator horn 3 fitted into the cylinder 2 , an electric/acoustic transducer 4 that applies ultrasonic vibration to the vibrator horn 3 , and a liquid reservoir formed between the cylinder 2 and the vibrator horn 3 5 and a nozzle part 7, the nozzle part 7
The ultrasonic atomizer is arranged downward from the horizontal direction, and is characterized in that the cylinder 2 is provided with an air exhaust means 2a19 that communicates the liquid storage section 5 with the atmosphere.

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.

[Effect]

In the present invention, liquid such as fuel supplied to the liquid storage section 5 from the liquid supply pipe 6 is supplied from the nozzle section 7 to the atomization section 3a and is atomized into fine droplets by ultrasonic vibration. Bubbles generated within the liquid storage section S by the ultrasonic vibrations rise within the liquid storage section S and reach the opening 2a and the air discharge pipe 9.
It is then released into the atmosphere.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial sectional view showing one embodiment of the ultrasonic atomization device of the present invention, and shows an example in which the ultrasonic atomization device is arranged horizontally.

Ultrasonic atomizer f! 1 consists of a cylinder 2, a vibrator horn 3 fitted into the cylinder 2, and an electric/acoustic transducer 4 that imparts ultrasonic vibration to the vibrator horn 3. A liquid storage section 5 is formed between the two, and a liquid such as fuel is supplied to the liquid storage section 5 from a liquid supply pipe 6.

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, a nozzle portion 7 is formed between the cylinder 2 and the vibrator horn 3, and liquid is supplied from the nozzle portion 7 to the atomization portion 3a. In addition, 8 is 0
It's a ring.

An opening 2a communicating with the atmosphere is formed in the upper part of the cylinder 2, and an air exhaust pipe 9 is connected and fixed to the opening 2a. Note that the diameter of the opening 2a is set to be large enough to resist the surface tension of the bubbles and allow them to escape.

Furthermore, if the amount of liquid supplied is small and there is no risk of the liquid coming out of the cylinder 2, the air exhaust pipe 9 may not be provided.

To explain its operation, liquid such as fuel is supplied from the liquid supply pipe 6 to the liquid storage section 5, is supplied from the nozzle section 7 to the atomization section 3a, and is atomized into fine droplets by ultrasonic vibration. At this time, the bubbles generated in the liquid storage part S by the ultrasonic vibration rise inside the liquid storage part 5 and are discharged into the atmosphere through the opening 2a and the air discharge pipe 9, so that the bubbles are ejected from the tip nozzle part. By reducing the clearance of the tip nozzle portion 7, it is possible to achieve uniformity of liquid supply distribution to the atomization surface and stability of the spray amount.

FIG. 2 shows another embodiment of the invention. In the figure, the first
Components that are the same as those in the figures are given the same numbers and their explanations will be omitted.

In this embodiment, the tip nozzle part 7 is arranged facing downward, and the air discharge pipe 9 is bent upward from the horizontal direction to prevent the liquid in the liquid storage part 5 from leaking. .

〔Effect of the invention〕

As described above, according to the present invention, bubbles generated in the liquid storage section 5 due to ultrasonic vibrations rise within the liquid storage section 5 and are discharged into the atmosphere through the opening 2a and the air discharge pipe 9. , bubbles are not ejected from the tip nozzle portion 7. This makes it possible to reduce the clearance of the tip nozzle portion 7, thereby achieving uniformity in the liquid supply distribution to the atomization surface and stability in the amount of spray.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing one embodiment of the ultrasonic atomization device of the present invention, and FIG. 2 is a partial sectional view showing another embodiment of the present invention. 1... Ultrasonic atomization device, 2... Cylinder, 2a...
・Opening, 3... Vibrator horn, 3a... Atomization part, 4
... Electrical/acoustic conversion element, 5... Liquid storage section, 7.
... Nozzle part, 9... Air discharge pipe. Applicant: Tonen Corporation

Claims (1)

[Claims] (1) A cylinder, a vibrator horn fitted into the cylinder, an electric/acoustic transducer that imparts ultrasonic vibration to the vibrator horn, and formed between the cylinder and the vibrator horn. In an ultrasonic atomizer having a liquid storage part and a nozzle part, and in which the nozzle part is arranged downward from a horizontal direction, the cylinder is provided with an air discharge means that communicates the liquid storage part with the outside. Features of ultrasonic atomization device.