JPH034956A - Ultrasonic atomizing apparatus - Google Patents

Abstract

PURPOSE:To achieve miniaturization and wt. reduction by forming the leading end of a vibration horn into a shape having one wavy surface or a plurality of wavy surfaces and opening a liquid supply passage to the central part of said horn. 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 vibration generating part 2 and a vibrator horn 4 is formed to the leading end part of said main body 3. The vibrator main body 3 is formed so as to become thinner in its diameter toward the leading end thereof and the atomizing surface 4a of the horn 4 is formed into one wavy surface or a plurality of wavy surfaces and the wavy surfaces are formed on a concentric circle. A liquid supply passage 3a is formed in the vibrator main body 3, the jet orifice 3b opened to the central part of the horn 4 is formed to one end of said passage 3a, and a supply port 3c is formed to the other end thereof. A liquid supply pipe 5 is welded and fixed to the supply port 3c. The liquid supplied from the supply pipe 5 reaches the atomizing surface 4a of the horn 4 through the jet orifice 3b to be atomized by the ultrasonic vibration from the vibration generating part 2.

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). The ultrasonic atomizer is used to atomize liquids (including liquids such as turbid solutions) using ultrasonic vibration, and is particularly applicable to (1) automobiles, outboard motors, portable power devices, Ultrasonic atomizers applied to internal combustion engines used in the drive devices of consumer heat pump devices, etc.; (2) fuel injection nozzles for gas turbines; (3) boilers and heating furnaces for industrial, commercial and domestic use; Heating burner, (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 acceleration 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. especially,
At this time, when the liquid fuel is required to be atomized over a wide flow rate range (high turndown), such as in a gasoline engine, a solenoid valve is used as the liquid fuel supply means, and an ultrasonic atomizer is used as the liquid fuel supply means. A method is adopted in which liquid fuel is supplied directly to the atomization surface of the 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 passage 115 is formed between the cylinder 111 and the inner cylinder 112,
Fuel is supplied to the vibrator horn 113 from the entire circumference of the outer cylinder 111, and the fuel is atomized.

[Problem to be solved by the invention]

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, there is a problem 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 to solve the problem]

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. A vibrator horn 4 is formed, and a liquid supply path 3a is formed inside the vibrator main body 3. The tip of the vibrator horn 4 has one or more corrugated surfaces. It is characterized in that the liquid supply path 3a is opened in the central portion.

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 is
The liquid that flows down to the atomizing surface 4a of the vibrator horn 4 through the injection hole 3b and reaches the atomizing surface 4a is atomized by the 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 body 3 is formed to have a narrow diameter at the tip, but may have the same diameter.Also, the atomizing surface 4a of the vibrator horn 4 is formed into one or more corrugated surfaces. This corrugated surface is formed on concentric circles as shown in FIG. An injection hole 3b that opens at the center of the vibrator horn 4 is formed in the oscillator horn 4, and a supply hole 3c that opens at the side surface of the vibrator body 3 is formed at the other end. A liquid supply pipe 5, which is fuel from a source (not shown), is welded and fixed.

The liquid supplied from the liquid supply pipe 5 passes through the liquid supply 3a1 and the injection hole 3b and reaches the atomization surface 4a of the vibrator horn 4, 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.

The second scheme shows another embodiment of the invention. In addition, the first
Components that are the same as those in the figures are given the same numbers and their descriptions will be omitted.

In the embodiment shown in FIG. 2, as shown in FIG. 2(a), a shielding plate 6 is disposed facing the injection hole 3b and with a gap from the atomization surface 4a. The shielding plate 6 is provided with a plurality of fixing pieces 6a, which are fixed to the vibrator hoe 74 by welding, as shown in FIG.

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. Prevents dripping. In addition, as shown in FIG.
You may also install this.

〔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 smaller in size) 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. DESCRIPTION OF SYMBOLS 1... Ultrasonic atomization device, 2... Ultrasonic vibration generating part width 3... Vibrator main 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 the main body, and the tip of the vibrator horn has one or more wave-shaped surfaces, and the liquid supply path is opened at the center thereof. Ultrasonic atomization device. (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.