JPH0679208A - Atomizing device - Google Patents

Abstract

PURPOSE:To provide an atomizing device where atomizing particles are atomized and particle diameters are made uniform with a stable atomizing pattern and the adjustable range of the atomized quantity is widened. CONSTITUTION:An inner wall 12c of a liquid chamber 12b is slid on an sliding part 15a of a valve part 15 and the abutting surfaces of an end surface 13 of a vibrating body 12 and the valve part 15 are separated and brought into contact with a constant gap and stable shear force maintained. When separated, liquid is fed into the constant gap to form a uniform thin liquid film and successively when in contact, the thin liquid film is driven away by constant and stable shear force caused by the surface abutting of the end surface 13 of the vibrating body 12 and the valve part 15 to atomize it in fine particles with a stable atomization pattern. Thus with a constant vibration amplitude, the formation of an uniform, extremely thin liquid film and the atomization of uniform particle diameter by stable shear force due to the surface abutting are obtained. And by adjusting the feed quantity of liquid to the end surface 13 of the vibrating body 12, the atomized quantity is made variable with a wide range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an atomizing device for atomizing a liquid such as water, oil or a chemical solution by vibration, and a humidifier, a medical device for atomizing a drug, a liquid combustor, a chemical processor, etc. It is used for.

[0002]

2. Description of the Related Art Conventionally, various atomizers of this type have been proposed and are being put into practical use or being studied for practical use. For example, as shown in FIG. 4, a high pressure pump 1 pressurizes a liquid and atomizes the liquid by ejecting it from a nozzle 2, and as shown in FIG. A rotary spraying device that supplies the liquid and atomizes it by centrifugal force. Further, as shown in FIG. 6, a piezoelectric element 6 is provided at the bottom of the liquid tank 5 to concentrate ultrasonic waves near the liquid surface of the liquid tank 5. There is a liquid immersion type ultrasonic atomizing device that atomizes. Further, in the horn-type ultrasonic atomizing device, as shown in FIG. 7, the horn-shaped vibrator 7 is made of duralumin or the like to amplify the vibration amplitude of the piezoelectric element 8 and the like and also to amplify the amplitude. The liquid was supplied from the supply pipe 10 to the horn tip portion 9 thus formed, and atomized.

[0003]

However, the above-mentioned conventional pressure spraying device (FIG. 4) has a large atomized particle size and poor particle size uniformity, resulting in inadequate atomization performance. Since the atomization state deteriorates extremely when lowered, the adjustment range of the atomization amount was small. The rotary atomizer (Fig. 5)
Although the adjustment range of the atomization amount is larger than that of the above-mentioned pressure spraying device, a device for rotation and power consumption are required, the size of the entire device is increased, and the atomized particle size is large. The liquid immersion type ultrasonic atomizer (FIG. 6) requires an extremely large ultrasonic energy because it directly irradiates the liquid surface with ultrasonic waves to atomize, requires high frequency driving, and obtains a large amount of atomization. Is difficult and the uniformity of the particle size is poor. Furthermore, the variation of the atomization operation due to the temperature and physical properties of the atomized liquid is significant, and compensating for this is troublesome. The horn type ultrasonic atomizer (Fig. 7) can obtain a larger amount of atomization than the liquid immersion type ultrasonic atomizer described above, but the thickness of the liquid film on the surface of the horn is small. Since the size of the diameter is controlled and it is extremely difficult to obtain a thin liquid film uniformly, the atomized particle size is large and the uniformity is poor, and the atomization performance was insufficient. . As described above, the above conventional atomizer has a problem that atomization performance such as atomization of atomized particles and uniformization of particle diameter is insufficient, and the adjustment range of the atomization amount is small.

The present invention solves the above problems, and provides an atomizing device that atomizes and homogenizes atomized particles, and that is small in size and expands the adjustment range of the atomization amount.

[0005]

In order to achieve the above-mentioned object, the present invention provides an electric vibrator for generating vibration, a vibrator connected to the electric vibrator, and a tip portion of the vibrator. Is formed with a liquid supply part for supplying a liquid and a liquid chamber provided in communication with the liquid supply part, and abutting against the tip surface of the vibrating body on the outer periphery of the liquid chamber, the tip surface of the vibrating body is vibrated by vibration. And a valve portion provided with a sliding portion that slides between itself and the inner wall of the liquid chamber to supply the liquid in the liquid chamber to the tip surface of the vibrating body.

[0006]

According to the present invention, when the electric vibrator is driven by the above structure, the tip surface of the vibrating body is vibrated. At this time, since the inner wall of the liquid chamber slides along the sliding portion provided on the valve portion,
The contact surface between the tip end surface of the vibrating body and the valve portion is opened and closed by the vibration of the tip end surface of the vibrating body maintaining a uniform gap and a stable contact force (shearing force) without displacement or inclination. When the contact surface is opened, the liquid is supplied from the liquid supply part through the liquid chamber to the tip end surface of the vibrating body through the inside of the sliding part to the tip surface of the vibrating body to form a constant space between the valve parts. A uniform thin liquid film is formed in the gap. Subsequently, when the contact surface is closed, this thin liquid film is beaten out by a constant stable shearing force generated at the contact between the tip surface of the vibrating body and the valve portion, and an atomization pattern with no deviation. Atomization with a uniform particle size can be obtained with fine particles. The atomization amount can be adjusted widely by adjusting the liquid supply amount.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 11 denotes an electric vibrator for generating a vibration, which is composed of, for example, lead zirconate titanate porcelain or the like, and a pair of vibrations which are made into electrodes by applying silver to both end surfaces. It is a stack of several children that are electrically connected in parallel. Reference numeral 12 denotes a vibrator, which is made of metal such as duralumin or stainless steel, and is closely attached to one outer end surface (silver electrode side) 11a of the electric vibrator 11 to be joined thereto.
The vibration generated by the
Can be transmitted to the tip surface 13 of the. Vibrating body 1
At the tip 12a of 2, the pipe 1 is connected to a liquid source (not shown).
Liquid supply unit 14 which is a supply path connected via 4a
And a liquid chamber 12 provided in communication with the liquid supply unit 14.
b is formed. Reference numeral 15 is a valve portion, which is brought into contact with the tip surface 13 of the vibrating body 12 with a predetermined pressure by the elastic body 16 or the like,
The sliding portion 15a is provided so as to slide with the inner wall 12c of the liquid chamber 12b, and the liquid in the liquid chamber 12b is slidable on the sliding portion 15a.
A supply port 15b is provided to supply the tip surface 13 of the vibrating body 12 via a passage 15c which is inside a. The contact surface 17 between the tip surface 13 of the vibrating body 12 and the valve portion 15 opens and closes due to the vibration of the tip surface 13 of the vibrating body 12, and the inner wall 12c of the liquid chamber 12b slides on the valve portion 15.
It is designed to slide along a.

The operation of the above structure will be described with reference to FIG. When a vibrator driving device (not shown) is activated, the electric vibrator 11 (FIG. 1) is driven, the tip surface 13 of the vibrating body 12 is vibrated with an appropriate vibration amplitude, and this vibration causes the vibrating body 12 to vibrate. Contact surface 17 between tip surface 13 and valve portion 15
Opens and closes in synchronization with the vibration frequency. FIG. 2a shows a vibrator 1
2 shows the state in which the front end surface 13 is open and passes through the liquid chamber 12b from the liquid supply portion 14 and is inside the sliding portion 15a.
The liquid is supplied from the supply port 15b to the tip surface 13 of the vibrating body 12 via c. The tip surface 13 of the vibrating body 12 and the valve portion 15
The gap formed by is almost equal to the vibration amplitude, and at this time, since the inner wall 12c of the liquid chamber 12b is along the sliding portion 15a provided in the valve portion 15, the tip surface 13 of the vibrating body 12 is On the other hand, the position of the valve portion 15 is never displaced or tilted. Therefore, the gap formed by the tip surface 13 of the vibrating body 12 and the valve portion 15 is always constant, and the liquid supplied to this gap forms a uniform and extremely thin liquid film L.
Next, FIG. 2B shows a state of a transitional stage toward closing, in which the inner wall 12c of the liquid chamber 12b slides on the sliding portion 15a to form a gap formed between the tip surface 13 of the vibrating body 12 and the valve portion 15. The volume is uniformly reduced over the entire surface, and the liquid film present at the time of full opening is a uniform fine droplet L on the outer periphery of the tip surface 13 of the vibrating body 12.
to form d. FIG. 2c shows a closed state, and the inner wall 12c of the liquid chamber 12b also extends along the sliding portion 15a at this time, so that the end surface 13 of the vibrating body 12 and the valve portion 15 do not come into contact with each other. However, a uniform surface contact is obtained over the entire contact surface. It is struck out by a constant stable shearing force generated on this surface, and further becomes a fine particle group D to obtain a stable atomization pattern without deviation, and a uniform extremely thin liquid film with a constant vibration amplitude. Uniform atomization with a uniform particle size can be obtained due to the formation and the constant and stable shearing force due to the surface contact. Then, the atomization amount can be varied widely by adjusting the liquid supply amount to the tip surface 13 of the vibrating body 12. Moreover, the structure is simple and small.

Next, another embodiment of the present invention will be described with reference to FIG. 3 is different from the above-described embodiment in that the vibrating body 12 has a cross-sectional area of the tip surface 13 of the vibrating body 12 smaller than the cross-sectional area on the side where the electric vibrator 11 is joined. . According to the configuration of this embodiment, a large vibration amplitude is concentrated on the tip surface 13 of the vibrating body 12 due to the effect of focusing the vibration energy, and strong vibration is obtained. Therefore, the tip surface 13 of the vibrating body 12 and the valve portion 15 are The effect of increasing the shearing force of the liquid film at the time of contact with the surface is to obtain uniform atomization with a finer particle size. Then, the tip surface 13 of the vibrating body 12
The liquid is supplied to the sliding port 15a or the inner wall 12 of the liquid chamber 12b in the above embodiment.
Even if one of c has a supply path formed by a groove or the like, the same operational effect as described above can be obtained.

[0011]

As described above, according to the atomizing device of the present invention, the following effects can be obtained. (1) Since the contact surface between the tip surface of the vibrating body and the valve portion is opened and closed by the vibration of the tip surface of the vibrating body, an extremely thin liquid is applied between the contact surface between the tip surface of the vibrating body and the valve portion during this opening and closing. The film-forming action and the tapping action due to the shearing force on the liquid film continuously occur to atomize fine particles. (2) Since the inner wall of the liquid chamber slides on the sliding portion provided on the valve portion, the gap or contact surface formed between the tip surface of the vibrating body and the valve portion does not always shift or tilt. Since a constant uniform gap and a constant stable shearing force can be maintained by vibrating the tip surface of the vibrating body, it is possible to obtain a uniform thin liquid film and a stable atomization pattern without deviation. . (3) Atomization with a uniform particle size can be obtained by the formation of a uniform extremely thin liquid film with a constant vibration amplitude and the stable shearing force due to the surface contact. (4) The atomization amount can be widely varied by adjusting the liquid supply amount to the tip surface of the vibrating body. (5) Since the vibrating body has the cross-sectional area of the tip end surface of the vibrating body smaller than the cross-sectional area of the side where the electric vibrator is joined, the vibrating body has a large vibration amplitude due to the effect of focusing the vibration energy. Since a strong vibration is obtained, the shearing force of the liquid film generated when the tip surface of the vibrating body and the valve portion are in contact with each other is increased, and more uniform atomization can be obtained with finer particles. (6) The structure is simple and can be made compact.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an atomizing device according to an embodiment of the present invention.

FIG. 2A is a cross-sectional view of a main part of the atomizing device showing a state in which the tip end surface of the vibrating body is open. FIG. 2B is a main part showing a state of a process in which the tip surface of the vibrating body of the atomizer moves toward the closed state. Sectional view c is a sectional view of essential parts showing a state in which the tip end surface of the vibrating body of the atomizing device is closed.

FIG. 3 is a sectional view of a main part of an atomizing device according to another embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a conventional atomizing device.

FIG. 5 is a sectional view of a main part of another conventional atomizing device.

FIG. 6 is a sectional view of a main part of another conventional atomizing device.

FIG. 7 is a sectional view of a main part of another conventional atomizing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Electric vibrator 12 Vibrating body 12a Vibrating body tip part 12b Liquid chamber 12c Liquid chamber inner wall 13 Vibrating body tip surface 14 Liquid supply part 15 Valve part 15a Sliding part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhiko Ishikawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Tomonori Aso, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Naoyoshi Maehara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. An electric vibrator for generating vibration,
A vibrating body connected to the electric vibrator, a liquid supply section for supplying a liquid to the tip of the vibrating body, a liquid chamber provided in communication with the liquid supply section, and vibration of the outer periphery of the liquid chamber. A slide contacting the tip surface of the body to open and close the tip surface of the vibrating body by vibration and slide with the inner wall of the liquid chamber to supply the liquid in the liquid chamber to the tip surface of the vibrating body. Atomization device consisting of a valve section having a section. 2. The atomizing device according to claim 1, wherein the vibrating body is configured such that a cross-sectional area of a tip end surface of the vibrating body is smaller than a cross-sectional area of a connecting side of the electric vibrator.