JPH0332765A - Ultrasonic atomizing device - Google Patents

Abstract

PURPOSE:To always keep the flowing-out velocity constant even when the flow rate is increased and to obtain the uniform atomization by increasing the clearance of nozzle part between an outer cylinder and an inner cylinder with the increase of fuel flow rate. CONSTITUTION:A fuel supply sleeve 3 is formed between the outer cylinder 1 and the inner cylinder 2, and the nozzle part 4 is formed all over the periphery of a vibrator phone. A rotatable fitting mechanism allowing to rotate or a slide mechanism allowing to slide is provided between the outer cylinder 1 and the inner cylinder 2 so that the clearance of nozzle part 4 is increased with the increase of the fuel flow rate. As a result, the flowing-out velocity is always kept constant even when the fuel flow rate is increased, so that the uniform atomization is possible and the turning-down of fuel flow rate is largely allowed without the deterioration of atomizing effect.

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 foods, pharmaceuticals, agricultural chemicals, and fertilizers, temperature control and humidity control sprays, baked powder sprayers (ceramic granulation), spray coating equipment, and reaction equipment. 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 atomization arrangement, 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. 4 shows an ultrasonic atomizer that supplies liquid to the entire circumference of the atomizing surface, and is composed of an outer cylinder 102, an inner cylinder 101, and an IH transducer horn 103. Ultrasonic vibrations are applied by the vibration generating means.

A circumferential groove 104 is formed on the outer circumference of the inner cylinder 101 over the entire circumference, and a circumferential groove 104 is formed on the outer circumference of the inner cylinder 101.
2 and the inner cylinder 101 is a fuel supply sleeve 1
07, a nozzle portion 106 is formed over the entire circumference of the vibrator horn 103, and a fuel supply hole 105 is formed.
The fuel supplied from the oscillator horn 103 is supplied from the nozzle part 10B to the atomizing surface at the tip of the vibrator horn 103 and atomized.

[Problem to be solved by the invention]

However, in the above conventional ultrasonic atomization device,
When the amount of fuel supplied from the fuel supply hole 105 increases, the outflow speed becomes too fast, causing the problem that the fuel cannot be completely atomized on the atomization surface, resulting in wave riding.

The present invention solves the above problems, and provides an ultrasonic atomization device that always maintains a constant outflow velocity even when the fuel flow rate increases, enables uniform atomization, and is applicable to high turndown. With the goal.

[Means to solve the problem]

To this end, the ultrasonic atomization device of the present invention has an outer cylinder 1 and an inner cylinder 2, and by forming a fuel supply sleeve 3 between the outer cylinder 1 and the inner cylinder 2, the nozzle is formed over the entire circumference of the vibrator horn. In the ultrasonic atomizer formed by forming the part 4, the outer cylinder 1 and the inner cylinder 2 are rotatably fitted together at the threaded part 5, so that the clearance of the nozzle part 4 can be increased by increasing the fuel flow rate. Features.゛Also,
Instead of forming the outer cylinder 1 and the inner cylinder 2 into a rotatable fitting mechanism, they may be formed into a slide mechanism which is slidable in the axial direction.

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, when the fuel flow rate is low, the clearance D of the nozzle part 4 is made small to supply fuel from the entire circumference of the nozzle part 4, and when the fuel flow rate increases, the fuel is supplied from the entire circumference of the nozzle part 4. By rotating or sliding the outer cylinder 1 to increase the clearance D of the nozzle part 4, the turndown of the fuel flow rate is increased without reducing the atomization effect by keeping the outflow velocity constant.

〔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,
FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1.

In FIG. 1, the vibrator horn explained in FIG. 4 is omitted. In the figure, the ultrasonic atomizer has an outer cylinder 1 and an inner cylinder 2, and a fuel supply sleeve 3 between the outer cylinder 1 and the inner cylinder 2.
By forming the nozzle portion 4 over the entire circumference of the vibrator horn.

The outer cylinder 1 and the inner cylinder 2 have a threaded portion 5.
It is fitted so that it can rotate freely. The outer cylinder 1 is driven by an electric motor such as a stepping motor through a gear transmission mechanism (not shown).

FIG. 3 shows an example in which the ultrasonic atomization device of the present invention is applied to an engine. In the figure, 11 is a cylinder, 12 is a piston, 13 is an intake valve, 14 is an exhaust valve, 15 is an intake pipe, 1
Reference numeral 6 indicates an exhaust pipe, and the above-mentioned ultrasonic atomizer 17 and electromagnetic valve 18 are attached to the intake pipe 15. The vibrator horn 19 is arranged facing the intake valve 13.

To explain the operation of the present invention having the above configuration, the liquid supplied from the solenoid valve 18 passes through the fuel supply sleeve 3 and is sprayed from the nozzle part 4 to the vibrator hose 19, thereby atomizing the fuel. When the fuel flow rate is low, the nozzle part 4
The clearance D is made smaller so that fuel is supplied from the entire circumference of the nozzle portion 4, and when the fuel flow rate increases, the stepping motor is driven by detecting, for example, the engine rotational speed or the negative pressure in the intake pipe. By rotating the outer cylinder 1 to increase the clearance D of the nozzle portion 4, it is possible to keep the outflow velocity constant and increase the turndown of the fuel flow rate without reducing the atomization effect. Further, it is also possible to adjust the spray angle θ shown in FIG. 3, and it is possible to prevent fuel droplets from adhering to the intake pipe 15.

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 outer cylinder 1 is rotatable, but the inner cylinder 2 may also be rotatable. Further, instead of forming the outer cylinder 1 and the inner cylinder 2 into a rotatable fitting mechanism, they may be formed into a slide mechanism which is slidable in the axial direction.

Further, in the above embodiment, the outer cylinder 1 is rotated by the electric motor 2, but the intake pipe 1
A diaphragm may be connected to 5, and the diaphragm may be actuated by negative pressure in the intake pipe, and the outer cylinder 1 may be rotated by a transmission mechanism.

〔Effect of the invention〕

As explained above, according to the ultrasonic atomization device of the present invention,
When the fuel flow rate increases, by rotating or sliding the outer cylinder to increase the nozzle clearance D, the turndown of the fuel flow rate is increased without reducing the atomization effect by keeping the outflow velocity constant. be able to.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an 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. A sectional view showing an example in which the device is applied to an engine, and FIG. 4 is a schematic sectional view showing an example of a conventional ultrasonic atomization device. DESCRIPTION OF SYMBOLS 1... Outer cylinder, 2... Inner cylinder, 3... Fuel supply sleeve, 4... Nozzle part, 17
...Ultrasonic atomization device, 19...Pregnancy horn. Applicant Toa Fuel Industry Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] (1) In an ultrasonic atomizer having an outer cylinder and an inner cylinder, and forming a nozzle portion over the entire circumference of the vibrator horn by forming a fuel supply sleeve between the outer cylinder and the inner cylinder, An ultrasonic atomizer characterized in that the outer cylinder and the inner cylinder have a rotatable fitting mechanism or a slidable slide mechanism, and the clearance of the nozzle part is increased by increasing the fuel flow rate.