JPH034953A - Ultrasonic atomizing apparatus - Google Patents

Abstract

PURPOSE:To achieve miniaturization and wt. reduction by providing an ultrasonic vibration generating means, the vibrator main body connected thereto, the vibrator horn formed to the leading end thereof and the liquid supply passage formed in the vibrator main body. CONSTITUTION:An ultrasonic atomizing apparatus 1 is equipped with an ultrasonic vibration generating part 2 and a vibrator main body 3 is connected to said generating part 2 and a vibrator horn 4 is formed to the leading end part of the vibrator main body 3. The horn 4 has an elliptical cone-shape and the central part of the atomizing surface 4a thereof is allowed to protrude and a curved surface curved in a recessed state from said central part to the conical upper bottom edge part of the horn 4a is provided to the atomizing surface 4a. The liquid supplied from a liquid supply pipe 5 passes through a liquid supply passage 3a and a jet orifice 4b to reach the atomizing surface 4a of the vibrator horn 4 and the liquid reaching the atomizing surface 4a is atomized by the ultrasonic vibration from the ultrasonic vibration generating part 2. Since the fuel liquid droplets atomized by the atomizing surface 4a thus constituted are diffused in a wide angle direction, the mixing properties with air are improved. Since the liquid supply passage 3a is provided in the vibrator main body 3, miniaturization is achieved.

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). Regarding ultrasonic atomization devices for atomizing liquid materials such as cloudy solutions using ultrasonic vibration, in particular (1) automobiles, outboard motors, and portable power devices. , an ultrasonic atomization device applied to an internal combustion engine used as a drive device of a consumer heat pump device, etc. (2)
Fuel injection nozzles for gas turbines, (3) Industrial, commercial and domestic boilers, heating furnaces, heating burners, (4)
) 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), spray coating equipment, reaction and (5) 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. - In particular, when liquid fuel is required to be atomized over a wide flow range (high turndown), such as in a gasoline engine, a solenoid valve is used as the liquid fuel supply means, A method is adopted in which liquid fuel is directly supplied to the atomization surface of an ultrasonic atomization device.

In this type of ultrasonic atomizer, it is essential to form a thin film of liquid on the atomization surface in order to ensure good atomization efficiency over a wide fuel supply range. Various efforts have been made for this purpose.

FIG. 3 shows an ultrasonic atomizer that supplies liquid to the atomization surface from a plurality of holes, including a cylinder 101, a nozzle body 102,
It consists of a vibrator horn 103 and an electro-acoustic conversion element 104, a fuel supply passage 105 is formed in the cylinder 101, and an injection hole 106 communicating with the fuel supply passage 105 is formed in the nozzle body 102. A plurality of injection holes 106 are formed on the circumference of the nozzle body 102, and the fuel injected from the injection holes 106 is supplied to the vibrator horn 103 to atomize the fuel.

FIG. 4 shows an ultrasonic atomizer that supplies liquid to the entire circumference of the atomizing surface, and is composed of an outer cylinder 111, an inner cylinder 112, a vibrator horn 113, and an electric/acoustic transducer 114. A fuel supply path 115 is formed between the cylinder 111 and the inner cylinder 112, and fuel is supplied from the entire circumference of the outer cylinder 111 to the vibrator horn 1.
13 to atomize the fuel.

[Problem that the invention seeks to solve]

However, in the above conventional ultrasonic atomization device,
In either case, since a cylinder for supplying fuel is provided around the outer periphery of the vibrator horn, problems arise in that the device becomes larger and heavier.

An object of the present invention is to solve the above problems and to reduce the size and weight of the device.

[Means for solving problems]

For this purpose, the ultrasonic atomization device of the present invention includes an ultrasonic vibration generating means 2 for generating ultrasonic vibrations, a vibrator body 3 connected to the ultrasonic wave generating means, and a tip of the vibrator body. The vibrator horn 4 has a vibrator horn 4 formed therein, and a liquid supply path 3a formed inside the vibrator main body 3. 3a is open.

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

[Effect]

In the present invention, for example, as shown in FIG. 1, the liquid supplied from the liquid supply pipe 5 flows down to the atomization surface 4a of the vibrator horn 4 through the liquid supply path 3a1 and the injection hole 3b, and is misted. The liquid that has reached the atomization surface 4a is atomized by ultrasonic vibrations from the ultrasonic vibration generator 2.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure is a sectional view showing an embodiment of the ultrasonic atomization device of the present invention.

In FIG. 1, an ultrasonic atomizer 1 includes an ultrasonic vibration generator 2 at its base for generating ultrasonic vibrations, and a vibrator main body 3 is connected to the ultrasonic vibration generator 2. A vibrator horn 4 is formed at the tip of this vibrator body 3. The vibrator horn 4 has an elliptical cone shape, and preferably has a protruding central portion of its atomizing surface 4a and a concave curved surface extending from the central portion to the upper bottom edge of the cone. Inside the vibrator body 3, a liquid supply path 3a is formed in the axial direction, and at one end of the liquid supply path 3a there is formed an injection hole 3b that opens at the center of the vibrator horn 4, and at the other end. Supply hole 3C opened on the side surface of the vibrator body 3
A liquid supply pipe 5, which is fuel from, for example, a fuel injection valve (not shown), is welded and fixed to the supply hole 3c.

The liquid supplied from the liquid supply pipe 5 reaches the atomization surface 4a of the vibrator horn 4 through the liquid supply 3at and injection hole 3b, and the liquid that reaches the atomization surface 4a generates ultrasonic vibrations. It is atomized by ultrasonic vibration from part 2. The atomization surface 4a having such a configuration allows the atomized fuel droplets to be diffused in a wide angle direction, thereby improving the miscibility with air.

Next, another embodiment of the ultrasonic atomization device of the present invention is shown in FIG.
) to (C).

In this embodiment, the shielding plate 6 is disposed facing the injection hole 3b with a gap provided therebetween. The shielding plate 6 includes (b)
As shown in the figure, a plurality of fixing pieces 6a are formed and fixed to the atomizing surface 4a of the fixing pieces 6 by welding. In this embodiment, when the fuel flow rate supplied from the injection hole 3b increases and the liquid drips from the atomization surface 4a, the liquid substance is temporarily stopped by the shielding plate 6 and atomized there. Can prevent liquid dripping. Moreover, as shown in (C), a plurality of opening lowers a may be provided on the bottomed cylindrical shielding member 7 and these may be attached.

〔Effect of the invention〕

As explained above, according to the ultrasonic atomization device of the present invention, the passage for supplying the liquid substance to the atomization surface is
Since it is formed inside the vibrator body, it is lighter in weight and more compact than the conventional method in which the liquid supply passage is provided outside the vibrator body.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of one embodiment of the ultrasonic atomization device of the present invention, FIG. 2(a) is a schematic sectional view of another embodiment of the ultrasonic atomization device of the present invention, and FIG. b) and (C) are perspective views of the shielding member, and FIGS. 3 and 4 are schematic sectional views showing an example of a conventional ultrasonic atomization device. 1... Ultrasonic atomization device, 2... Ultrasonic vibration generator,
3... Vibrator body, 3a... Liquid supply path, 4...
Vibrator horn, 4a... Atomization surface, 5... Liquid supply pipe, 6.7... Shielding member.

Claims (2)

[Claims] (1) An ultrasonic vibration generating means for generating ultrasonic vibrations, a vibrator body connected to the ultrasonic generating means, a vibrator horn formed at the tip of the vibrator body, and the vibrator. and a liquid supply path formed inside a main body, wherein the vibrator horn has a substantially conical shape, and the liquid supply path is opened at a central portion of the vibrator horn. (2) The ultrasonic atomization device according to claim 1, characterized in that a shielding member is disposed opposite to the opening of the liquid supply path, and the shielding member is fixed to the vibrator horn.