JPH04118072A - Ultrasonic atomizer - Google Patents

Abstract

PURPOSE:To prevent an effect of temp. change in assembling by fixing a vibrator phone by both ends of a cylinder through a rubber member and further providing plural communicating holes with the external air in the cylinder. CONSTITUTION:An annular nozzle 7a is formed between a cylinder 2 and a sleeve 6, and a liq. is supplied therefrom to an atomization part 3a and atomized by ultrasonic vibration. A vibrator phone 3 is fixed and supported by both ends of the cylinder 2 through oil-resistant rubber members 12 and 13. Several concyclic communicating holes 15, e.g. four, with the external air are formed in the cylinder 2. Accordingly, the rubber members 12 and 13 are not expanded or contracted by the temp. change in the cylinder 2 when the phone 3 is fixed by both ends of the cylinder 2 through the rubber members 12 and 13, and the relative position between the nozzle 7a and the atomization part 3a at the tip of the phone is not changed.

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.
As shown in Japanese Patent No. 136262, a vibrator horn is disposed inside the cylinder, a sleeve member is disposed on the outer periphery of the cylinder e, and a circular liquid supply path formed between the cylinder and the sleeve member is moved. A system is known in which liquid is supplied to the entire circumference of the atomizing surface at the tip of a sub-horn to uniformly atomize the liquid.

Conventionally, in the above method, a fixing flange is integrally formed at the node portion of the vibrator horn, and the flange is fixed and supported by the cylinder.

[Problems to be Solved by the Invention] There is a point in the node portion of the vibration system in the vibrator horn that, theoretically, there is no power loss 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, vibration occurs in the flange portion, causing a corresponding problem of 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 that the flange needs to be tightened uniformly, resulting in poor assembly performance.

Furthermore, in an atomizer, the relative position of the liquid supply nozzle and the atomizing part at the 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.

In order to solve these problems, the applicant has
No. 22894 discloses a cylinder, a vibrator horn fixed in the cylinder, an electric/acoustic transducer that imparts ultrasonic vibration to the vibrator horn, and an atomization formed at the tip of the vibrator horn. The present invention has proposed an ultrasonic atomizing device, which has a sleeve member for supplying liquid to the atomizing portion, and is characterized in that the vibrator horn is fixed by rubber members at both ends of the cylinder.

However, when the vibrator horn is fixed by rubber members at both ends of the cylinder, the rubber members expand or contract due to temperature changes within the cylinder, and the position of the liquid supply nozzle and the atomizing part at the tip of the vibrator horn may be relative to each other. There is a problem that the position may shift.

The present invention solves the above-mentioned problems, and the present invention reduces the power loss of the vibration system, facilitates manufacturing and assembly, and furthermore enables ultrasonic waves to prevent the effects of temperature changes during assembly. The purpose is to provide an atomization device.

[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 2, an electro-acoustic transducer 4 for imparting ultrasonic vibration to the vibrator horn 3, and an atomizing portion 3a formed at the tip of the vibrator horn 3. , the atomizing section 3 is screwed onto the outer periphery of the cylinder 2.
a sleeve member 6 for supplying liquid, and the vibrator horn 3 is connected to rubber members 12 and 13 at both ends of the cylinder 2.
The cylinder 2 is further characterized in that the cylinder 2 is provided with a plurality of communication holes 15 communicating with the outside air.

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.

[Operation] In 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 with flexibility at a position that optimizes the atomization characteristics. It can be supported. In addition, since the cylinder is provided with multiple communication holes that communicate with the outside air, when the vibrator horn is fixed with rubber members at both ends of the cylinder, there is no expansion or contraction of the rubber members due to temperature changes inside the cylinder, and the liquid is supplied. There is no deviation in the relative position of the nozzle and the atomizing section at the tip of the vibrator horn.

[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. The shape of this atomizing portion 3a is such that a radius of curvature is formed at the tip of a rod shape. Further, an annular nozzle part 7a is formed between the cylinder 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.
After inserting and positioning the atomizing part 3a and nozzle part 7a so that their concentricity is adjusted using a jig or the like and the relative position of the atomizing part 3a and the nozzle part 7a is in the optimum atomizing state, liquid cane rubber is injected into both ends. and fix it.

In this embodiment, for example, four communication holes 15 are formed on the circumference of the cylinder 2 to communicate with the outside air. Therefore, when fixing the vibrator horn 3 with the rubber members 12 and 13 at both ends of the cylinder 2, the cylinder 2
There is no expansion or contraction of the rubber members 12, 13 due to internal temperature changes, and the relative positions of the liquid supply nozzle 7a and the atomizing section 3a at the tip of the vibrator horn do not deviate.

Further, a plurality of attachment holes 16 for attaching the ultrasonic atomization device 1 to a place to be attached are provided on the outer periphery of the cylinder 2, and the positions of the plurality of attachment holes 16 and the plurality of communication holes 15 are set on the cylinder 2. Since they are arranged differently in the circumferential direction, even if the ultrasonic atomizer 1 is attached to the attachment point, the assembly work can be carried out without the communication hole 15 being blocked.

The ultrasonic atomizer of the present invention having the above configuration does not require machining of O-rings and O-ring grooves, thereby 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 between the two, making it possible to shorten the overall length and increase rigidity.

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

FIG. 3 shows a method of fixing between the atomizing section side end of the vibrator horn 3 and the cylinder 2 using a rubber member 12. (a) shows a method in which the tip of the cylinder 2 is thickened, and the inner periphery of the tip of the cylinder 2 and the cylinder 2 are thickened. The rubber member 12 is arranged in the thick part, and (b) shows an example in which the tip of the cylinder 2 has a sharp 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 cylinder 2 is at a right angle; (b) is an example in which a step is formed on the inner circumferential side of the rear end of the cylinder 2; (C) is an example in which an inclined surface is formed on the inner circumferential side of the rear end of the cylinder 2. An example is shown below.

[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 bone 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.

In addition, since the cylinder is provided with multiple communication holes that communicate with the outside air, when the vibrator horn is fixed with rubber members at both ends of the cylinder, there is no expansion or contraction of the rubber members due to temperature changes inside the cylinder, and the liquid is supplied. There is no deviation in the relative position of the nozzle and the atomizing section at the tip of the vibrator horn.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional view showing one embodiment of the ultrasonic atomization device of the present invention. Figure 2 is a cross-sectional view taken along the line ■-■ in Figure 1, Figure 3 is an enlarged cross-sectional view H showing the method of fixing the atomizing part side end ■ of the vibrator horn and the cylinder with a rubber member, FIG. 4 is an enlarged sectional view showing a method of fixing the end of the vibrator horn opposite to the atomizing part and the cylinder using a rubber member. ■...Ultrasonic exposure device, 2...Cylinder, 3...
Vibrator horn, 3a... Atomization section, 4... Electric/acoustic conversion atom, 6... Sleeve member, 7... Liquid supply path,
7a... Nozzle part, 12.13... Rubber member, 15
...Communication hole, 16...Mounting hole. Applicant: Tonen Co., Ltd. Patent Attorney Hirokan Shirai (7 others) ζ Figure 2

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 an atomizer formed at the tip of the vibrator horn. a sleeve member screwed onto the outer periphery of the cylinder to supply liquid to the atomizing section; the vibrator horn is fixed at both ends of the cylinder by rubber members; An ultrasonic atomization device characterized by providing a plurality of communicating holes. (2) A plurality of attachment holes for attaching the ultrasonic atomization device to the attachment point are provided on the outer periphery of the cylinder, and the positions of the plurality of attachment holes and the positions of the plurality of communication holes are set on the circumference of the cylinder. The ultrasonic atomization device according to claim 1, characterized in that the directions are different.