JPS61220756A - Ultrasonic wave atomizing device - Google Patents

Abstract

PURPOSE:To attain the improvement of the atomizing efficiency by screwing the respective male screws of a front horn and a rear horn to the female screws which are provided to the inside periphery of both sides of the oscillators and an electrode plate incorporated in the central part of a joint, compressing and sandwiching the oscillators and the electrodes plate. CONSTITUTION:The flanges are provided to the rear end of the front horn 3 and to the front end of the rear horn 4 and the male screws 13, 14 are cut to the outside periphery of the flanges and the respective male screws 13, 14 are screwed to the female screws 16, 17 which are provided to the inside periphery of both sides of the oscillators 5 and an electrode plate 16 incorporated in the central part of a joint 15 and the oscillators 5 and the electrode plate 6 are compressed and sandwiched with the front horn and the rear horn. Furthermore the liquid feeding holes 8', 8 perforating to an atomizing part 1 of a front end of the horn 3 from a rear end of the horn 4 are provided. In other words, since such design of a bolt that both the stress generated by the vibration and the area considered at a conventional article is not necessitated, the design efficiency is increased and an atomizing device actuating in the high frequency can be obtained and furthermore the element can be uniformly compressed because the clamping is only one position and the atomizing efficiency is made excellent.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a liquid ultrasonic atomization device (hereinafter referred to as an atomization device) using an ultrasonic electro-acoustic transducer (vibrator).

(Conventional technology) A conventional device of this type is shown in FIGS. 4 and 5.

The atomizing device shown in FIG. 4 consists of a front horn 3 and a rear horn 4 that are integrated with an amplifying horn 2 having an atomizing section 1, and piezoelectric actuators arranged on both sides of an electrode plate 6 with the same polarity facing each other. Holds the oscillators 5, 5 of the element.

A bolt 7 is passed through a hole provided in the axes of the rear horn, vibrator, and electrode plate and screwed into a screw hole provided in the front horn 3 to fix the pressure line, and the liquid is introduced into the atomizing section 1. A liquid supply hole 8 is provided through the bolt 7 and the front horn 3. The atomizer shown in FIG. 5 has flanges 9 and 9' facing each other at the rear end of the front horn 3 and the front end of the rear horn 4, which are integrated with the amplification horn 2 having the s-shaped part 1. The electrode plate 6 and the vibrators 5, 5 arranged in the same manner as shown in Fig. 4 are held between the front horn and the rear horn, and the flange 9°9'
The bolts 10 are passed through a plurality of holes provided in the front horn 3, and the bolts 10 are compressed and fixed with nuts 11, and the liquid supply pipe 12 is inserted into a hole that penetrates the rear horn 4 and extends halfway from the rear end of the front horn 3.
Liquid is made to pass through a liquid supply pipe 12 and a liquid supply hole 8 provided through the front horn.

(Problems to be Solved by the Invention) Atomizing devices typically have the advantage that the smaller the atomized particle size, the better the combustion efficiency and the shorter the flame length, so when used in an oil water heater, the burner can be made more compact. . To reduce the atomized particle size, it is necessary to increase the operating frequency.
For this purpose, the diameter of the vibrator must be made small, but the vibrator area must be larger than a certain level in order to generate the power necessary for atomization. Furthermore, the portion that compresses and fixes the vibrator must be able to withstand stress generated by vibration.

In the atomizing device shown in FIG. 4, since the bolt 7 is tightened, the diameter of the bolt 7 must be increased in order to withstand the stress generated by vibration, which has the disadvantage that the area of the vibrator becomes small. Although the atomizing device shown in FIG. 5 has been improved on this drawback, it is difficult to uniformly tighten a large number of bolts, and the atomization may not be achieved or the element may be destroyed due to one piece hitting the atomizing device.

The object of the present invention is to provide an atomization device that eliminates the above-mentioned drawbacks.

(Means for solving the problem) The present invention provides flanges at the rear end of the front horn and the front end of the rear horn, threads are cut on the outer periphery of the flanges, and each male thread is housed in the center of the joint. The vibrator and electrode plate are compressed and clamped by the front horn and the rear horn, and the mist from the rear end of the rear horn to the front end of the front horn is The present invention relates to an atomizing device having a liquid supply hole penetrating through an atomizing section.

In the present invention, the vibrator is made of lead zirconium titanate (PZT).
, barium titanate, etc. Although there are no particular limitations, PZT is usually used. The front horn and rear horn may be made of any material that can easily transmit vibrations, but aluminum is usually used. The joint may be made of aluminum, but steel is preferred from the viewpoint of strength.

The liquid supply pipe is not particularly limited to aluminum, steel, plastic, etc., but aluminum is usually used. The electrode plate may be of any material as long as it has good conductivity, but usually a copper plate is used.

It is easier to handle the structure of the liquid introduction part when a liquid supply pipe is inserted therein, as shown in FIG. It is also preferable to provide an amplification horn in front of the front horn.
Its shape may be stepped as shown in Figure 4, 9 conical,
There are no restrictions even if it is an exponential type. There are also no restrictions on the shape of the atomization section.

(Example) FIG. 1 is a front view of parts of an atomizing device according to an embodiment of the present invention before the vibrator and electrode plate are attached, and FIG. 2 is a sectional view of the atomizing device after assembly.

In the figure, 13 and 14 are male threads cut in opposite directions on the outer periphery of flanges provided at the rear end of the front horn 3 and the front end of the rear horn 4 made of aluminum. 15 is a steel joint, and 16 and 17 are female threads that are screwed into the male threads 13 and 14. In the space 18 in the center of the joint 15, vibrators 5, 5 each having an O-ring 19 and 19 around the outer periphery are placed.
Hold the disc part of the tadpole-shaped copper electrode plate 6 between the two.

The electrode plate 6 is housed from the side so that the tip (the tadpole's tail part) comes out from the hole 20.

Next, arrange the front horn 3, rear horn 3, and rear horn 4 on both sides of the joint 15, fix the wrench hooks (not shown) with a spanner, and rotate the joint 15 to remove the front horn 3 and the rear horn. The horn 4 is screwed into the joint 15, and the vibrator and electrode plate are compressed and fixed. In the figure, 24 is an exponential amplification horn integrated with the front horn 3, 1 is an atomizing section at its tip, and a liquid supply hole that penetrates from the rear end of the rear horn to the atomizing section 1 is There are two stages, 8 (small diameter) and 8' (large diameter), and the liquid supply pipe 12, which goes around the O ring 21 at the neck part 23 at the tip, is inserted into the 8'. The inner diameter is equal to the diameter of the liquid supply hole 8). The O-rings 19 and 19 electrically insulate the electrode plate 6 and the joint 15 and fix the vibrator and the electrode plate in the center during assembly, and the O-ring 21 prevents liquid supplied from the liquid supply pipe 12 from leaking. to prevent contact with the vibrator. Figure 3 is a cross-sectional view taken along the line A-A of the joint 15 in Figure 1. In Figure 9, 22 is a wrench hole for screwing together, and the hole 20 is a hole that allows the electrode plate 6 to rotate slightly when the joint is screwed. This indicates that the shaft is made longer in the direction of rotation to prevent it from coming into contact with the joint.

The atomizing device shown in FIGS. 4 and 5 was created using a vibrator and an electrode plate made of the same material as in the example.

Comparative Examples 1 and 2 were used, and atomization experiments were conducted using the atomization device of the above example. Table 1 shows the results.

As is clear from Table 1, in the atomizing device of the comparative example, when the operating frequency is increased, the bolt or vibrator is damaged, but in the example, there is no damage and the S conversion efficiency is good.

(Effects of the Invention) According to the present invention, unlike conventional products, there is no need to design bolts that take stress and area caused by vibration into consideration, so design efficiency is improved, and an atomization device that operates at high frequency is obtained. Furthermore, since the tightening is done in one place, the element can be compressed uniformly and the atomization efficiency is improved.

[Brief explanation of the drawing]

Figures 1 and 2 are a front view of parts in an atomizer according to an embodiment of the present invention, a sectional view of the assembled atomizer, and a third figure.
The figure is a side sectional view taken along the line A-A of the joint in FIG. 1, and FIGS. 4 and 5 are front views of a conventional ultrasonic atomizer. Explanation of symbols 1...Atomization section 2...Amplification horn 3...
・Front horn 4... Rear horn 5... Vibrator 6... Electrode plate 7... Pol)
8.8'...Liquid supply hole 9...Flange
10... Bolt 11... Nut 12... Liquid supply pipe 13... Screw 14... Screw 15
...Joint 16...Female thread 17...Female thread 18...Space 19...0 ring
20...hole 21...0 ring 22...
・Spanner hook part 23...Neck part 24...
Amplified Horn Rei 1 Loto 00. Fog/W IF
5・-・Angle IP, T=-n 2 (73tL, l'l・= 71.Jarri θ certain 30

Claims (1)

[Claims] 1. Provide flanges at the rear end of the front horn and the front end of the rear horn, cut threads on the outer periphery of the flanges, and attach each male thread to the inner periphery on both sides of the vibrator and electrode plate housed in the center of the joint. The vibrator and the electrode plate are compressed and clamped by the front horn and the rear horn, and a liquid supply hole is provided that penetrates from the rear end of the rear horn to the atomization section at the front end of the front horn. Ultrasonic atomization device.