JPH0724374A - Ultrasonic atomizer - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an ultrasonic spraying device that atomizes a liquid from a vibrating plate fixed to a piezoelectric vibrator by bringing a hydrophilic liquid retaining material into contact with the vibrating plate. [Structure] When a composite body including a piezoelectric vibrator 9 and a diaphragm 10 is driven, the piezoelectric vibrator 9 vibrates, and the vibration is propagated to the diaphragm 10. The liquid absorbed by the liquid absorbing material 4 is atomized through the through holes 14 as the diaphragm 10 vibrates. By providing the vibrating plate 10 on the lower surface of the piezoelectric vibrator 9, the pressure from below on the vibrating plate 10 is relieved. By providing the support body 13 and adopting a structure in which it faces the lower surface of the diaphragm 10 with a minute gap therebetween, the pressure from above on the diaphragm 10 is relieved. In this way, peeling between the piezoelectric vibrator 9 and the diaphragm 10 can be suppressed. [Effect] Since the separation between the piezoelectric vibrator and the vibration plate can be suppressed, atomization efficiency can be promoted and durability can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic spraying device used in a humidifier for controlling indoor humidity.

[0002]

2. Description of the Related Art An ultrasonic atomizer having an ultrasonic exciter having a structure in which a perforated diaphragm is fixed to a rectangular plate-shaped piezoelectric vibrator is applied for a patent by Japanese Patent Application No. 2-273001.
In addition, a patent application of "Ultrasonic Color Organ" generated by applying the ultrasonic atomizer has been filed on April 22, 1991 (Japanese Patent Application No. 3-119191).

FIG. 4 is a sectional view showing an example of a conventional ultrasonic atomizing device. When the piezoelectric vibrator is excited during driving of the ultrasonic atomizing device of the present embodiment, the vibration is propagated to the diaphragm fixed to the piezoelectric vibrator. When the liquid in the liquid storage tank is absorbed by the liquid retaining material and reaches the diaphragm, the liquid is atomized. In this embodiment, since the vibration plate is fixed to the upper end surface of the piezoelectric vibrator, an upward load from the liquid retaining material is applied to the vibration plate. Therefore, there is a drawback that the fixed portion between the piezoelectric vibrator and the vibration plate is easily separated. Therefore,
A method of preventing separation of the piezoelectric vibrator and the vibration plate by making a hole through the fixed portion and inserting a bolt into the hole to tighten the bolt has been devised. It hindered the vibration of the child and resulted in a decrease in atomization function.

[0004]

In the conventional ultrasonic atomizing device, since the vibrating plate is fixed to the upper end surface of the piezoelectric vibrator, an upward load is applied to the vibrating plate from the liquid retaining material, and the piezoelectric vibrating plate is applied. It has a drawback that the fixed portion between the vibrator and the diaphragm is easily separated. Further, as a method for preventing peeling, a method has been used in which a hole penetrating the fixed portion is opened and a bolt is inserted into the hole and tightened. It caused a decrease in atomization function.

An object of the present invention is to provide an ultrasonic spraying device capable of preventing peeling of a fixed portion between a piezoelectric vibrator and a vibrating plate without inhibiting vibration of the piezoelectric vibrator and improving an atomizing function. To do.

[0006]

An ultrasonic spraying device according to a first aspect of the present invention has a piezoelectric vibrator fixed to an end portion of the plate surface F2 of a diaphragm having plate surfaces F1 and F2 substantially parallel to each other. In the ultrasonic spraying device for atomizing a liquid contained in the liquid retaining material from the plate surface F2 by bringing a sponge, a fiber bundle or other hydrophilic liquid retaining material into contact with the substantially central portion of the plate surface F1. The diaphragms have the plate surfaces F1 and F2.
Is provided with a large number of through holes substantially vertically, and the opening area of the through holes on the plate surface F1 side is larger than the opening area on the plate surface F2 side. The liquid suction end sucks the liquid by being immersed in the liquid supply source, and the atomization end penetrates the liquid sucked by the liquid suction end by contacting the plate surface F1. It is characterized by supplying to the holes. The ultrasonic spraying device according to claim 2, further comprising a support body that faces at least a part of the plate surface F1 except a part in contact with the atomization end with a minute gap. To do.

[0007]

In the ultrasonic spraying device of the present invention, the piezoelectric vibrator is fixed to the end portion of the plate surface F2 of the vibrating plate having the plate surfaces F1 and F2 which are substantially parallel to each other, and the sponge is formed substantially in the center of the plate surface F1.
By contacting fiber bundles and other hydrophilic liquid retaining materials,
It has a structure in which the liquid contained in the liquid retaining material is atomized from the plate surface F2. When the plate surfaces F1 and F2 are horizontal, an upward load is applied to the vibrating plate from the liquid retaining material. According to such a structure, that is, the piezoelectric vibrator is fixed above the vibrating plate. According to the structure, the piezoelectric vibrator and the vibration plate are less likely to be separated from each other, and the stable atomization function can be maintained. The diaphragm is provided with a large number of through holes substantially perpendicular to the plate surfaces F1 and F2, and the opening area of the through holes on the plate surface F1 side is larger than the opening area on the plate surface F2 side. The liquid retaining material has a liquid absorption end and an atomization end. The liquid absorption end sucks up the liquid by being immersed in the liquid supply source, and the atomization end is the plate surface F.
The liquid sucked up by the liquid absorption end is supplied to the through hole by contacting with 1. That is, the liquid pushed up to the atomization end enters from the inlet side (wide mouth side) of the through hole, reaches the outlet side (narrow mouth side) while being subjected to the throttling action, and is discharged as mist. Further, there is provided a support body that faces at least a part of the plate surface F1 excluding the part in contact with the atomization end, that is, at least a part of the peripheral part of the plate surface F1 excluding the central portion with a minute gap. By adopting the structure, it becomes possible to withstand the load from above the diaphragm.

[0008]

1 is a sectional view showing an embodiment of an ultrasonic spraying device of the present invention. This embodiment comprises a system unit 1, a spring 2, a nozzle 3, a liquid absorbing material 4, a liquid storage chamber 5, a housing 6, a cover 7 and a battery 8. The system unit 1 includes a piezoelectric vibrator 9, a diaphragm 10 and a drive circuit 11, which are housed in a case 12. The upper end of the case 12 is fixed to the cover 7. The liquid absorbent material 4 is fixed to the liquid storage chamber 5. The liquid storage chamber 5 is filled with liquid at the time of use, and substantially the lower half of the liquid absorbent material 4 is immersed in the liquid. The liquid absorbent material 4 is made of acetate fiber or the like.

FIG. 2 is a partial sectional view of the system unit 1 and its periphery. The diaphragm 10 is provided on the lower surface of the piezoelectric vibrator 9. The diaphragm 10 comes into contact with the liquid absorbent material 4 on its lower surface. The diaphragm 10 has a large number of minute through holes 14 (not shown in FIG. 2). Supports 13 are provided on both sides of the liquid absorbent material 4. The support 13 is fixed to the case 12, and faces the lower surface of the diaphragm 10 with a minute gap (1 to 2 mm).

FIG. 3 is a partial cross-sectional view of the system unit 1 and its surroundings as seen from the diaphragm 10 side. Case 1
The support 13 provided on the second surface faces the lower surface of the diaphragm 10 with a minute gap.

When the ultrasonic spraying device of FIG. 1 is driven, when an AC signal having a frequency substantially equal to the resonance frequency of the composite of the piezoelectric vibrator 9 and the vibration plate 10 is applied to the piezoelectric vibrator 9, the piezoelectric vibrator 9 is driven. Be excited. At this time, the frequency of the AC signal substantially matches one of the resonance frequencies of the piezoelectric vibrator 9 alone. Since the vibrating plate 10 has a structure in which at least one end face of the piezoelectric vibrator 9 is integrally connected and fixed, the vibrating plate 10 vibrates with the piezoelectric vibrator 9 as the piezoelectric vibrator 9 is excited. The plate 10 is vibrated in such a manner that the fixed portion to the plate 10 serves as a fixed end. The diaphragm 10 is constantly in contact with the liquid absorbent material 4 under a constant load due to the pressure of the spring 2. When the liquid is supplied from the liquid absorbing material 4 to the vibration plate 10, the liquid is guided to the through hole 14 provided in the vibration plate 10 by the capillary phenomenon. The area of the through hole 14 on the inlet side is set to be larger than the area on the outlet side. Therefore, the liquid introduced to the inlet side of the through hole 14 becomes fine and uniform particles, flows out to the outlet side of the through hole 14, and is efficiently atomized.

When the cover 7 is opened and closed in order to replenish the liquid and replace the liquid absorbing material 4 in the ultrasonic atomizing apparatus of FIG. 1, the cover 7 is vigorously closed to vibrate the diaphragm 10 and the liquid absorbing material 4. May collide. The collision between the vibration plate 10 and the liquid absorbing material 4 may cause the piezoelectric vibrator 9 and the vibration plate 10 to be separated from each other. However, since the structure in which the vibration plate 10 is provided on the lower surface of the piezoelectric vibrator 9 is adopted, the pressure from below on the vibration plate 10 is relieved. Further, since the support body 13 is provided in the case 12 and the support body 13 is opposed to the lower surface of the diaphragm 10 with a minute gap, the pressure on the diaphragm 10 from above is relaxed. . In this way, the ultrasonic spraying device of the present invention can suppress the separation between the piezoelectric vibrator 9 and the vibration plate 10 without hindering the atomization function.

[0013]

According to the ultrasonic spraying device of the present invention, by adopting the structure in which the vibration plate is provided on the lower surface of the piezoelectric vibrator, the pressure applied to the vibration plate from below is relieved. Also,
By providing the support body that faces the lower surface of the diaphragm with a minute gap, the pressure from above on the diaphragm is relieved. In this way, the ultrasonic spraying device of the present invention can suppress separation between the piezoelectric vibrator and the diaphragm without disturbing the atomization function. Therefore, the atomizing function can be maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an ultrasonic spraying device of the present invention.

FIG. 2 is a partial cross-sectional view of the system unit 1 and its periphery.

FIG. 3 is a partial cross-sectional view of the system unit 1 and its periphery when viewed from the diaphragm 10 side.

FIG. 4 is a sectional view showing an example of a conventional atomizing device.

[Explanation of symbols]

 1 System Unit 2 Spring 3 Nozzle 4 Liquid Absorbing Material 5 Liquid Storage Chamber 6 Housing 7 Cover 8 Battery 9 Piezoelectric Vibrator 10 Vibration Plate 11 Drive Circuit 12 Case 13 Support 14 Through Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Hashimoto 2480 Kuno, Odawara-shi, Kanagawa Mikuni Odawara factory (72) Inventor Koji Toda 1-49-18 Futaba, Yokosuka City, Kanagawa Prefecture

Claims (2)

[Claims] 1. A piezoelectric vibrator is fixed to an end portion of the plate surface F2 of a diaphragm having plate surfaces F1 and F2 which are substantially parallel to each other, and a sponge, a fiber bundle, and other hydrophilic parts are provided substantially in the center of the plate surface F1. In the ultrasonic spraying device for atomizing the liquid contained in the liquid retaining material from the plate surface F2 by bringing the liquid retaining material into contact with the diaphragm, a large number of the vibration plates are provided substantially perpendicular to the plate surfaces F1 and F2. A through hole is provided, and the plate surface F1 of the through hole is
Side opening area is larger than the opening area on the plate surface F2 side, the liquid retaining material has a liquid absorption end and an atomization end, and the liquid absorption end is immersed in the liquid supply source And the atomizing end contacts the plate surface F1 to supply the liquid sucked by the liquid absorbing end to the through hole. 2. The support according to claim 1, further comprising a support member that faces at least a part of the plate surface F1 except for a part in contact with the atomization end with a minute gap. Ultrasonic spray device.