JPH0723564Y2 - Ultrasonic liquid atomizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an ultrasonic liquid atomizer suitable for atomizing fuel for vehicles or atomizing water and other liquids.

(Prior Art) Generally, atomization of fuel (gasoline) for an automobile is performed by spraying the fuel into a stream of air through a nozzle.
In this case, the atomized particles have a large particle size of 200 to 300 μm,
A large amount of fuel adheres to the inner wall of the pipe through which the air-fuel mixture passes, and even if the amount of fuel sprayed from the nozzle is increased, the concentration of the air-fuel mixture is difficult to increase.

Therefore, as shown in FIG. 5, conventionally, a part of the pipe 2 through which the fuel mixture passes is ultrasonically vibrated by a piezoelectric oscillator (Languvan type oscillator) 22 that is bolted to remove the fuel adhering to the inner wall of the pipe 21. It has been proposed to atomize.

(Problems to be solved by the invention) However, in the conventional structure shown in FIG. 5, the piezoelectric vibrator 22 projects vertically to the outside of the pipe 21, so that the installation space becomes large in an automobile or the like. There was a problem that I was disliked and also weakened by vibration.

(Means for Solving the Problems) In view of the above points, the present invention is to provide an ultrasonic liquid atomizer that is small in size, does not take up space, and is excellent in earthquake resistance.

According to the present invention, a cylindrical vibrating body having a taper portion having a reduced thickness toward the downstream end of the gas flow,
A cylindrical piezoelectric vibrator is provided, and ultrasonic vibrations are transmitted through the cylindrical piezoelectric vibrator to an inner circumference or an outer circumference of an upstream side of a portion where the wall thickness is tapered in the cylindrical vibrator. As described above, the above problems are solved by the integrated mounting. In addition, a concave portion or a convex portion may be formed on the inner circumference of the cylindrical vibrating body.

(Operation) In the ultrasonic liquid atomizer of the present invention, the ultrasonic vibration of the cylindrical piezoelectric vibrator is enlarged in amplitude in the tapered thin horn portion of the cylindrical vibrator, and the tip of the horn portion is expanded. Liquid such as fuel and water is atomized into fine particles in the part.

(Example) Hereinafter, an example of an ultrasonic liquid atomizer according to the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. In this figure,
Reference numeral 1 denotes a cylindrical vibrating body made of aluminum, stainless steel or the like, and the inner peripheral surface of the portion near the tip (the portion near the lower end) is a tapered surface 2
Has become. That is, the cylindrical vibrating body 1 is integrally provided with the horn portion 4 in which the wall thickness decreases in a taper shape toward the tip, and the thin wall portion 3 is subsequently formed.

A vibrator arranging step portion 5 and a female screw 6 are formed on the inner periphery of the cylindrical vibrating body 1, and a cylindrical piezoelectric vibrator 7 as shown in FIG. , And nut 8
Are screwed into the female screw 6, and the vibrator 7 is tightened and integrated with the vibrating body 1. The cylindrical vibrator 7 has a second
As shown in the figure, the piezoelectric element 10 has electrodes 11 and 12 formed on the inner peripheral surface and the outer peripheral surface, respectively, and when a high-frequency voltage is applied between both electrodes, the height direction (axial direction) or the spreading direction ( Generates ultrasonic vibration in the radial direction.

An elastic sealing material 13 made of silicon resin, rubber or the like is closely attached to the inner peripheral side of the cylindrical piezoelectric vibrator 7, and the surface opposite to the surface facing the cylindrical vibrating body 1 is provided. It is sealed. This is to prevent deterioration of the oscillator due to fuel adhering to the inner surface of the oscillator. Further, 15 is a nozzle for spraying fuel, and an arrow P shows the direction of the air flow. The taper surface 2 has a wall thickness that tapers toward the downstream end of the air flow.

In the configuration of the first embodiment described above, the cylindrical piezoelectric vibrator 7
When a high-frequency voltage is applied between the electrodes 11 and 12, the vibrator 7 generates ultrasonic vibrations, and the amplitude is expanded in the horn portion 4 of the cylindrical vibrator 1. As a result, the thin portion 3 at the tip of the vibrating body 1 vibrates ultrasonically with a sufficiently large amplitude, and the vibrating body 1 among the fuel sprayed from the nozzle 15 is vibrated in this portion.
The fuel that adheres to the inside of the and becomes droplets is atomized into fine particles of about 40 μm. As a result, the concentration of the mixture of fuel and air can be made sufficiently large in accordance with the amount of fuel supplied from the nozzle 15. Further, there is an advantage that the particle size of the atomized particles obtained can be made considerably smaller than that obtained by simply spraying from the nozzle.

FIG. 3 shows a second embodiment of the present invention. In this figure,
1A is a cylindrical vibrating body made of aluminum, stainless steel, etc., and the outer peripheral surface of the portion near the tip (the portion near the lower end) is a tapered surface 2A
Has become. That is, the cylindrical vibrating body 1A is integrally provided with a horn portion 4A in which the wall thickness decreases in a taper shape toward the tip, and subsequently, the thin wall portion 3A is formed. Further, a vibrator placement step portion 5A and a male screw 6A subsequent to the vibrator placement step portion 5A are formed on the outer periphery of the cylindrical vibrating body 1A.
A cylindrical piezoelectric vibrator 7 is arranged at 5A, and a nut 8A is screwed onto the male screw 6A to tighten and integrate the vibrator 7 with the vibrating body 1A. The cylindrical piezoelectric vibrator 7
An elastic sealing material 13A made of silicon resin, rubber or the like is closely attached to the outer peripheral side of the.

The operation and effect of the second embodiment is the same as that of the first embodiment described above, but since the cylindrical piezoelectric vibrator 7 is arranged on the outer periphery of the cylindrical vibrating body 1A, fuel, etc. passing through the vibrating body is Therefore, there is an advantage that the piezoelectric vibrator 7 is less likely to deteriorate.

FIG. 4 shows a third embodiment of the present invention. In this figure,
A spiral convex portion 15 is formed on the inner circumference of the cylindrical vibrating body 1B. The other structure is similar to that of the second embodiment shown in FIG.

According to the third embodiment, there is an advantage that the fuel can be atomized even at the tip of the convex portion 15.

In the first embodiment described above, the case where the fuel is sprayed from the nozzle 15 has been described. However, liquid such as fuel and water may be dripped or continuously supplied to the thin portion 3 at the tip of the vibrator by a thin tube or the like. However, atomization operation is possible. Further, instead of the spiral convex portion 15 of FIG. 4, a convex portion in the axial direction or the circumferential direction may be formed, and the convex portion may be formed discontinuously.

(Effects of the Invention) As described above, according to the ultrasonic liquid atomizer of the present invention, the cylindrical vibration having the tapered wall thickness portion toward the downstream side tip of the tip gas flow. Since the cylindrical piezoelectric vibrator is mounted on the inner or outer circumference of the body, it is small and does not occupy a lot of space, and it is excellent in earthquake resistance, and its effect is extremely large when applied to a fuel atomizing device of an automobile or the like.

[Brief description of drawings]

1 is a longitudinal sectional view showing a first embodiment of an ultrasonic liquid atomizer according to the present invention, FIG. 2 is a perspective view showing an example of a cylindrical piezoelectric vibrator, and FIG. 3 is a perspective view of the present invention. 2 is a longitudinal sectional view showing an embodiment,
FIG. 4 is a vertical sectional view showing a third embodiment of the present invention, and FIG. 5 is a plan view showing an example of a conventional ultrasonic liquid atomizer. 1,1A, 1B …… Cylindrical vibrator, 2,2A …… Tapered surface, 3,3A
...... Thin section, 4,4A ...... Horn section, 5,5A ...... Step section, 7 ......
Cylindrical piezoelectric vibrator, 8,8A ... nut.

Claims (2)

[Scope of utility model registration request] 1. A cylindrical vibrating body having a taper portion having a reduced thickness toward a downstream end of a gas flow,
A cylindrical piezoelectric vibrator is provided, and ultrasonic vibrations are transmitted through the cylindrical piezoelectric vibrator to an inner circumference or an outer circumference of an upstream side of a portion where the wall thickness is tapered in the cylindrical vibrator. An ultrasonic liquid atomizer characterized by being integrally attached as described above. 2. The ultrasonic liquid atomizer according to claim 1, wherein a concave portion or a convex portion is formed on the inner circumference of the cylindrical vibrating body.