JPH0418954A - Ultrasonic atomizing device - Google Patents

Abstract

PURPOSE:To reduce the power loss of vibration system by providing the atomizing part formed at the top end of a vibrator phone and the sleeve member supplying liquid to the vibrator phone, and fixing and supporting the vibrator phone with both ends of a cylinder. CONSTITUTION:An annular liquid supply passage 7 is formed between the cylinder 2 and the sleeve member 6, and liquid is supplied to the liquid supply passage 7 from a liquid supply pipe 8 welded to the sleeve member 6. The atomizing part 3a is formed at the top end of the vibrator phone 3. The vibrator phone 3 is fixed and supported at both ends of cylinder 2 with oil-resistive rubber members 12, 13. When it is to be supported, the vibrator phone 3 is inserted into the cylinder 2 at first, and then the concentricity of both members is secured by a jig, etc., and positioning is so carried out that the relative position of the atomizing part 3a and a nozzle part 7a is in the optimum atomizing position, and then liquid rubber is pored to both ends to fix them. By this method, the preciseness of dimension is improved, and the cost is reduced.

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 drying liquid materials such as food, pharmaceuticals, agricultural chemicals, fertilizers, etc., temperature and humidity control sprays, baked powder sprayers (ceramic granulation) , 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] Conventionally, as an ultrasonic atomization device that uses ultrasonic waves to atomize a liquid substance into extremely small droplet size, for example, Japanese Patent Application Laid-Open No. 1983-1999
As shown in Japanese Patent No. 136262, a vibrator horn is disposed within a cylinder, a sleeve member is disposed around the outer circumference of the cylinder, and the vibrator is supplied from an annular liquid supply path formed between the cylinder and the sleeve member. A system is known in which the liquid is uniformly atomized by supplying liquid to the entire circumference of the atomizing surface at the tip of the horn.

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.

[Problems to be Solved by the Invention] Theoretically, there is a point in the node portion of the vibration system of the vibrator horn that no power loss occurs even if it is fixed. However, in reality, because the fixing flange has a width rather than a point, and because the speed of sound differs even with the same material, the positions of the respective node parts are different even if the vibrator horn is manufactured with the same dimensions. It will be different. 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.

Furthermore, since the cutting of the flange requires precision, the cost is high, and the flange must be tightened uniformly, resulting in poor assembly performance.

Furthermore, in an atomizing device, the relative position of the liquid supply nozzle and the exposed tip of the vibrator horn is an important factor in atomizing characteristics, but in the case of fixation with a flange, the relative position is fixed. Therefore, there is a problem in that the degree of freedom in adjusting the atomization characteristics is restricted.

The present invention solves the above-mentioned problems, and provides an ultrasonic atomizing device that reduces power loss in the vibration system, is easy to manufacture and assemble, and can prevent liquid dripping. The purpose is to

[Means for solving the problem] For this purpose, the ultrasonic atomization device of the present invention includes a cylinder 2,
A vibrator horn 3 fixed in the cylinder, an electric/acoustic transducer element 4 that applies ultrasonic vibration to the vibrator horn, and an atomizing section 3a formed at the tip of the vibrator horn.
and a nozzle part 7a that supplies liquid to the atomizing part,
The vibrator horn is attached to rubber members 12 at both ends of the cylinder.
It is characterized by being fixed and supported by 13.

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 and supported by rubber members at two locations on the cylinder, the vibrator horn can be flexibly fixed to the cylinder at a position that optimizes the atomization characteristics. It can be supported. Further, since the concentricity between the vibrator horn and the cylinder is ensured, the sleeve member is fixed to the cylinder with only a short threaded portion, so that the overall length can be shortened and the rigidity can be increased. Furthermore, since the thick portion is formed at the tip of the sleeve member, the liquid discharged from the nozzle portion is held on the vibrator horn side by surface tension with the thick portion at the tip, thereby preventing liquid dripping.

[Example] 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.

As shown in FIGS. 1 and 2, the ultrasonic atomizer 1 includes a cylinder 2, a vibrator horn 3 fixed and supported within the cylinder 2, and an ultrasonic vibration applied to the vibrator horn 3. It is composed of an electric/acoustic transducer element 4 and a sleeve member 6 that is screwed onto the outer periphery of the cylinder 2 at a threaded portion 5 . An annular liquid supply path 7 is provided between the cylinder 2 and the sleeve member 6.
A liquid supply pipe 8 is formed and fixed to the sleeve member 6 by welding.
A liquid is supplied from the liquid supply path 7 to the liquid supply path 7 .

An atomizing section 3a is formed at the tip of the vibrator horn 3. In addition to the hemispherical shape shown in the figure, the exposed portion 3a may have an enlarged diameter shape, a butt shape, a rounded tip, a dish shape, or the like. Further, an annular nozzle part 7a is formed between the flange 2 and the sleeve member 6, and liquid is supplied from the nozzle part 7a to the atomizing part 3a and atomized into fine droplets by ultrasonic vibration.

The vibrator horn 3 is fixed and supported at both ends of the cylinder 2 by oil-resistant rubber members 12 and 13.

When fixing, first place the vibrator horn 3 inside the cylinder 2.
is inserted and positioned using a jig or the like so that their concentricity is adjusted and the relative position of the atomizing part 3a and nozzle part 7a is in the optimum atomizing state, and then liquid rubber is injected into both ends. It is to be fixed in place.

Therefore, machining of the O-ring and the O-ring groove is not necessary, improving dimensional accuracy and reducing costs.

In addition, since the concentricity between the vibrator horn 3 and the cylinder 2 is ensured, the sleeve member 6 is fixed to the cylinder 2 only by the short threaded part 5, and unlike the conventional case, the sleeve member 6 is fixed to the cylinder 2 by the short threaded part 5. There is no need for a fitting part to ensure concentricity, the overall length can be shortened, and the rigidity can be increased and the force f can be increased.

Furthermore, thermal strain caused by welding when fixing the liquid supply pipe 8 to the sleeve member 6 can be reduced.

Figure 3 shows the end of the atomizing section of the vibrator horn 3 and the 7IJ cylinder 2.
(a)
(b)
An example is shown in which the tip of the hash/s/da 2 is a 7-year edge.

FIG. 4 shows a method of fixing the end of the vibrator horn 3 opposite to the atomizing part and the cylinder 2 with a rubber member 13.
(a) is an example in which the rear end of the flange 2 is at a right angle; (b) is an example in which a stepped portion is formed on the inner circumferential side of the rear end of the flange 2; (C) is an example in which an inclined surface is formed on the inner circumferential side of the rear end of the flange 2. An example is shown below.

FIG. 5 shows another embodiment of the invention.

As a result of various experiments, in the above embodiment, the nozzle part 7
It has been found that the liquid supplied from the nozzle m7a to the atomizing section 3a drips due to gravity because the tip of the sleeve member 6 constituting the sleeve member a is sharp. Therefore, a thick tip portion 6a was formed at the tip of the sleeve member 6. 6th
The figure shows the experimental results of the thickness D of the thick tip portion 6a and the amount of liquid dripping, and it was found that if the tip thickness D is 1 mm or more, the amount of liquid dripping is almost eliminated. This is because the liquid discharged from the nozzle portion 7a is held on the vibrator horn 3 side due to surface tension with the tip thickness K e a.

[Effects of the Invention] As described above, according to the present invention, since the vibrator horn is fixed and supported by rubber members at two locations on the cylinder, the vibrator horn is fixed to the cylinder at a position that optimizes the atomization characteristics.
Compared to the conventional case of rigidly fixing with a flange, the power loss of the vibration system can be reduced to about half, and the cutting and assembly of the vibrator horn can be easily performed.

Further, since the concentricity between the vibrator horn and the cylinder is ensured, the sleeve member is fixed to the flange with only a short threaded portion, so that the overall length can be shortened and the rigidity can be increased.

Furthermore, since a thick part is formed at the tip of the sleeve member,
Since the liquid coming out of the nozzle part is held on the vibrator horn side by the surface tension with the thick tip part, dripping of the liquid is prevented.

[Brief explanation of the drawing]

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 a method of fixing the end of the vibrator horn on the side of the atomizing part and the ring with a rubber member, and Figure 4 shows the end of the vibrator horn on the side opposite to the atomizing part and the ring. FIG. 5 is an enlarged sectional view showing a method of fixing with a rubber member, FIG. 5 is an enlarged sectional view showing another embodiment of the present invention, and FIG. 6 is a diagram showing experimental results of the thickness of the tip of the sleeve member and the amount of liquid dripping. be. 1... Ultrasonic atomizer, 2... Flange, 3...
Vibrator horn, 3a...Atomization part, 4...Electro-acoustic conversion element, 5...Threaded part, 6...Sleeve member, 6
a...Tip thickness part, 7...Liquid supply path, 7a...Nozzle part, 8...Liquid supply pipe, 12. 13...Rubber member. Applicant Hiroki Shirai, Patent Attorney, Sub-Representative of Tonen Co., Ltd. (6 others) Figure 3 (a) (b) Figure 4 (a) (b) (C) Figure 2 Figure 5 Figure 6 Figure Tokei 1 'f;J+D (mm)

Claims (3)

[Claims] (1) A cylinder, a vibrator horn fixed in the cylinder, an electric/acoustic transducer that applies ultrasonic vibration to the vibrator horn, and an atomizer formed at the tip of the vibrator horn. and a sleeve member for supplying liquid to the atomizing section, and the vibrator horn is fixed and supported by rubber members at both ends of the cylinder. (2) A sleeve member that is screwed onto the outer periphery of the cylinder at a threaded portion, an annular liquid supply path formed between the cylinder and the sleeve member, and a liquid supply pipe that supplies liquid to the liquid supply path. The ultrasonic atomization device according to claim 1, characterized in that it has: (3) The ultrasonic atomization device according to claim 1 or 2, wherein a thick portion is formed at the tip of the sleeve member, and the thickness is set to 1 mm or more.