JPH03224657A - Ultrasonic atomizer - Google Patents

Abstract

PURPOSE:To attain the uniformity of the liquid supply distribution to an atomizing surface and the stability of a spraying amt. by forming the tip of a nozzle part for supplying liquid to the atomizing part formed at the tip of an oscillator horn to the shape cut at the plane perpendicular to an axial direction. CONSTITUTION:Ultrasonic oscillations are imparted on the oscillator horn 3 fixed in a cylinder 2 by an electro-acoustic transducer element 4. A liquid supplying path 7 is formed between the cylinder 2 and a sleeve member 6 screwed to the outer periphery of the cylinder 2. Further, the liquid is supplied by the nozzle part 7a to the atomizing part 3a formed at the tip of the oscillator horn 3. The oscillator horn 3 is fixed and supported to the cylinder 2 by two pieces of elastic bodies 10, 11 provided between node parts 9a, 9b at two points of the oscillator horn 3 and the cylinder 2. Further, the shape at the tip of the nozzle part 7a is formed to the shape cut at the plane perpendicular to the axial direction. As a result, the uniformity of the liquid supply distribution to the atomizing surface and the stability of the the spraying amt. are obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention generally relates to a liquid substance such as a liquid fuel that is supplied (in this specification, liquid substance refers to a liquid such as a liquid fuel, or (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 the purpose of drying liquid materials such as foods, pharmaceuticals, agricultural chemicals, and fertilizers, temperature control and humidity control sprays, baked powder sprayers (ceramic granulation, etc.) ), 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.

[Prior Art] As an ultrasonic atomizer that uses ultrasonic waves to atomize a liquid substance into extremely small droplet sizes, for example, a vibrator horn is disposed within a cylinder, and a A system is known in which liquid is supplied from a tip nozzle portion to the entire circumference of the atomizing surface at the tip of a vibrator horn to atomize the liquid.

Conventionally, in the above method, a fixing flange is formed integrally with the node portion of the vibrator horn, and the flange is fixed and supported on the cylinder. Further, a liquid storage portion is formed between the cylinder and the vibrator horn, and liquid is supplied from the tip nozzle portion to the entire circumference of the atomization surface of the vibrator horn.

[Problems to be Solved by the Invention] Theoretically, there is a point where the node portion of the vibrator horn does not cause power loss even if it is fixed. However, in reality,
Since the fixing flange has a width rather than a point, and also because the speed of sound differs even if the material is the same, the positions of the respective node portions will differ even if vibrator horns are manufactured with the same dimensions. As a result, there is a problem in that vibration occurs in the flange portion, resulting in a corresponding power loss in the vibration system.

Further, there are problems in that the cutting process of the flange requires high precision, which increases the cost, and the flange needs to be tightened uniformly, resulting in poor assembly performance.

Furthermore, since a liquid reservoir is formed between the cylinder and the vibrator horn, the clearance of the tip nozzle between the cylinder and the vibrator horn is increased (then the jet mfA
The stability of the liquid will improve, but the uniformity of the liquid supply distribution to the atomizing surface will decrease. Conversely, if the clearance at the tip nozzle is made smaller, the uniformity of the liquid supply distribution to the atomizing part will improve, but the atomization will decrease. There is a problem that the stability of the amount decreases. 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. .

SUMMARY OF THE INVENTION An object of the present invention is to provide an ultrasonic atomization device that solves the above problems and can reduce power loss in the vibration system and can be easily manufactured and assembled.

Another object of the present invention is to reduce the clearance of the tip nozzle part and improve the shape of the tip, thereby making it possible to achieve uniformity in liquid supply distribution to the atomization surface and stability of the spray amount. The objective is to provide a device for converting

[Means for solving the problem] For this purpose, the ultrasonic atomization device of the present invention includes a cylinder 2,
A vibrator horn 73 fixed in the cylinder, an electric/acoustic transducer 4 that applies ultrasonic vibration to the vibrator horn, and a liquid supply path 7 screwed onto the outer periphery of the cylinder 2 and connected to the cylinder 2. a sleeve member 6 forming a oscillator horn, an atomizing part 3a formed at the tip of the vibrator horn, a nozzle part 7a for supplying liquid to the atomizing part, and two 7-dot parts of the vibrator horn. 9a19b and two elastic bodies 10.11 provided between the cylinder, the vibrator horn is fixed and supported on the cylinder by the elastic bodies, and the shape of the tip of the nozzle part is adjusted in the axial direction. It is characterized by having a shape that is cut in a vertical plane.

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.

[Function] In the present invention, since the vibrator horn is fixed with elastic bodies at two node portions, the vibrator horn can be fixed and supported by the cylinder with flexibility, and the vibrator horn and Comradeship between the cylinder and sleeve members can be easily established. In addition, the liquid supply path is formed between the cylinder and the sleeve member and is not affected by the vibration of the vibrator horn, so even if the clearance is extremely small, the spray amount will not become unstable like in the past. .

[Example code] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial cross-sectional view showing one embodiment of the ultrasonic atomization device of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG.

The ultrasonic atomizer 1 includes a cylinder 2, a vibrator horn 3 fixed and supported within the cylinder 2, an electric/acoustic transducer 4 that applies ultrasonic vibration to the vibrator horn 3, and an outer circumference of the cylinder 2. It is composed of a sleeve member 6 which is screwed into the sleeve member 6 through a screw portion 5. An annular liquid supply path 7 is formed between the cylinder 2 and the sleeve member 6, and liquid is supplied to the liquid supply path 7 from a liquid supply pipe 8.

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 expanding/flexing shape shown in the figure, an expanded diameter shape, or a butt shape. Further, an annular nozzle portion 7a is formed between the cylinder 2 and the sleeve member 6,
The liquid is supplied from the nozzle section 7a to the atomizing section 3a and is atomized into fine droplets by ultrasonic vibration. In this way, the liquid supply path 7 is formed between the cylinder 2 and the sleeve member 6,
Since there is no influence from the vibration of the vibrator horn 3, even if the clearance is made extremely small, the amount of spray does not become unstable as in the conventional case.

The vibrator horn 3 has a non-vibrating portion, that is, two node portions 9at9b, and the inner circumferential surface of the cylinder 2 has two node portions 9at9b.
Grooves are formed facing the node portions 9a, 9b, and elastic bodies 10.11 made of O-rings are fitted into the grooves. Therefore, when the vibrator horn 3 is inserted into the cylinder 2, the vibrator horn 3 is fixedly supported by the elastic body 10.11, and the coherence of the vibrator horn 3, the cylinder 2, and the sleeve member 6 can be easily maintained. I will be able to put it out.

FIG. 3 is an enlarged sectional view showing the tip shapes of the vibrator horn 3, cylinder 2, and sleeve member 6.

In the present invention, the tip shapes of the cylinder 2 and sleeve member 6 are not formed with sharp edges.
It has a shape that cuts in a plane perpendicular to the axial direction. This facilitates achieving dimensional accuracy in the inner diameter and overall length of the cylinder 2 and sleeve member 6. Also, the inner diameter of the tip of the sleeve member 6 is set to be 0.0 mm smaller than the diameter of the vibrator horn 3. 2
~0. Conventionally, the inner diameter of the tip of the sleeve member 6 was made larger than the diameter of the vibrator horn 3 by about 0.1 to 0.2 mm. Misalignment of the core also affected the distribution of the spray, and slight cavitation affected the stability of the spray, but the inner diameter of the tip of the sleeve member 6 was set to 0. By increasing the temperature by approximately 2 to 0.5, the circumferential distribution of the spray and the stability of the spray were improved.

[Effects of the Invention] As described above, according to the present invention, since the vibrator horn is fixed by elastic bodies at two node portions, the vibrator horn can be fixed and supported by the cylinder with flexibility. This makes it easier to cut and assemble the vibrator horn, since the sameness of the vibrator horn, cylinder, and sleeve members can be easily achieved compared to the conventional case of rigidly fixing the vibrator horn with a flange. At the same time, power loss in the vibration system can be reduced by about half.

In addition, since the liquid supply path is formed between the cylinder and the sleeve member and is not affected by the vibration of the vibrator horn, even if the clearance is extremely small, the spray m
never becomes unstable.

Furthermore, by improving the shape of the tip nozzle part, it is possible to improve the uniformity of the liquid supply distribution to the atomization surface and the stability of the spray amount.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing one 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.
The figure is an enlarged sectional view showing the tip shapes of the vibrator horn, cylinder, and sleeve member. 1... Ultrasonic atomization device, 2... Cylinder, 3...
Vibrator horn, 3a... Atomization section, 4... Electric/acoustic conversion element, 6... Sleeve member, 7... Liquid supply path,
7a... Nozzle part, 9as9b... Node part, 1
0, 11... Elastic body, 12... Sealing material. Applicant: Tonen Corporation

Claims (2)

[Claims] (1) A cylinder, a vibrator horn fixed in the cylinder, an electric/acoustic transducer that applies ultrasonic vibration to the vibrator horn, and a liquid that is screwed onto the outer periphery of the cylinder and is connected to the cylinder. A sleeve member forming a supply path, an atomizing section formed at the tip of the vibrator horn, a nozzle section that supplies liquid to the atomizing section, two node sections of the vibrator horn, and the cylinder. and two elastic bodies provided between the two elastic bodies, the vibrator horn is fixed and supported on the cylinder by the elastic bodies, and the tip shape of the nozzle part is cut in a plane perpendicular to the axial direction. An ultrasonic atomization device characterized by: (2) The ultrasonic atomization device according to claim 1, wherein the inner diameter of the tip of the sleeve member is approximately 0.2 to 0.5 mm larger than the diameter of the vibrator horn 3.