JP3327995B2 - Ultrasonic atomizer noise prevention structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing noise caused by spraying a liquid by an ultrasonic spraying device used in a humidifier for adjusting the humidity in a room.

[0002]

2. Description of the Related Art An ultrasonic atomizer having a structure in which a perforated vibration plate is fixed to a rectangular plate-shaped piezoelectric vibrator and having an ultrasonic exciter has been applied for a patent by Japanese Patent Application No. 2-273001.
A patent application for an "ultrasonic color organ" generated by applying the ultrasonic atomizing apparatus was filed on April 22, 1991 (Japanese Patent Application No. 3-119191).

FIG. 3 is a sectional view showing an embodiment of a conventional ultrasonic atomizer. When the ultrasonic atomizer of the present embodiment is driven, when the piezoelectric vibrator is excited, the excitation is transmitted 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 the ultrasonic atomizing device of the present embodiment, the ultrasonic atomizing device is maintained at a predetermined position by fixing the piezoelectric vibrator to the fixed object by the support. Such a conventional ultrasonic atomizing device sometimes involves noise when driven.

When the ultrasonic atomizer is driven, not only is the piezoelectric vibrator supported at a predetermined position with respect to the fixed object, but also the position of the diaphragm is maintained at a predetermined position in accordance with the position of the piezoelectric vibrator. Atomization can be realized. Accordingly, an attempt has been made to provide a guide at the tip of the diaphragm so that the diaphragm can be kept at a predetermined position, but the atomization function has been maintained, but the noise problem has not been solved.

[0005]

The conventional ultrasonic atomizer generates noise when driven, shortens the life of the apparatus itself, and sometimes causes long-term use, causing mental distress.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the noise of the ultrasonic atomizing apparatus without lowering the atomizing function and to maintain the durability of the ultrasonic atomizing apparatus. It is to provide a structure.

[0007]

According to a first aspect of the present invention, there is provided an ultrasonic spraying device noise prevention structure comprising a rectangular piezoelectric vibrator and a rectangular perforated vibrating plate, wherein the vibrating plate is at least one of the piezoelectric vibrators. An ultrasonic wave which is integrally and continuously fixed on one end face and in which the piezoelectric vibrator and the vibrating plate are fixed to each other is in an edge region of one side of each of the two, and the both sides are parallel to each other. A structure provided in a spraying device, wherein when the vibrating plate vibrates with the fixed portion as a fixed end in accordance with excitation of the piezoelectric vibrator, liquid is supplied to the vibrating plate; In the noise prevention structure for preventing noise generated when generating the spray of the above, comprising a support and a vibration damping material gripped by the support, the support is fixed to a fixed object, the vibration plate One of the two plate surfaces is a first plate surface When the other referred to as a second plate surface,
The vibration damping material contacts a region A on the first plate surface and a region B on the second plate surface, and the region occupied by the region A and the region B in the diaphragm is the region in the diaphragm. The area occupied by the area A and the area B in the diaphragm in the edge area of another side opposite to the side on the fixing portion side is the area of the first plate surface and the second plate surface And the region A and the region B are opposed to each other.

According to a second aspect of the present invention, there is provided an ultrasonic spraying device noise prevention structure as described in the paragraph [0007], wherein the edge area of the other side occupied by the area A and the area B in the diaphragm is: , At the center of the side.

[0009]

According to the present invention, there is provided an ultrasonic spraying apparatus comprising a support and a vibration damper provided on the support. The vibration damping material comes into contact with a portion A on one end surface and a portion B on the other end surface of the diaphragm in the ultrasonic spraying device, and a part of the support is fixed to a fixed object, so that the ultrasonic spraying device is used. This prevents noise caused by vibration when the is driven. Note that the portions A and B are almost facing each other. This is to make the force applied to the diaphragm by the vibration damping material as uniform as possible. In addition, since the parts A and B are formed by the respective end faces of the tip part of the diaphragm fixed to the piezoelectric vibrator in a cantilever shape, the area of the end face of the diaphragm used for atomization is maximized. can do. In this case, as the vibration damping material, the atomization function is achieved by using a material having a shape that comes into contact with both end surfaces of the front end portion of the diaphragm and side surfaces adjacent to the both end surfaces, that is, a shape that sandwiches the front end portion. Can be maintained.

[0010]

FIG. 1 is a sectional view showing an embodiment of an ultrasonic spraying device supported by an ultrasonic spraying device noise prevention structure of the present invention. The ultrasonic spray device of this embodiment is a piezoelectric vibrator 3
And the diaphragm 4. The ultrasonic spray device is supported by the ultrasonic spray device noise prevention structure shown in this embodiment. The ultrasonic spray device noise prevention structure includes a support 1 and a vibration damping material 2 fixed to the support 1. Vibration buffer 2
Is made of SE9157L (product name) manufactured by Dow Corning Toray Co., Ltd. and is in contact with the tip of the diaphragm 4. The piezoelectric vibrator 3 has a rectangular plate-shaped piezoelectric ceramic 5, and the material of the piezoelectric ceramic 5 is TDK72A (product name) and its length is 22 m.
m, the width is 20 mm, and the thickness is 1 mm. TDK72A
Since the material has a large electromechanical coupling coefficient, it is used in the embodiment here. The direction of the polarization axis of the piezoelectric ceramic 5 coincides with the thickness direction, and Au electrodes 6 and 7 are formed on both end surfaces perpendicular to the thickness direction. The Au electrode 6 covers one surface of the piezoelectric ceramic 5, and the Au electrode 7 covers the other surface of the piezoelectric ceramic 5. The diaphragm 4 is made of nickel and has a length of 1
It has a rectangular plate-like structure having a size of 7 mm, a width of 20 mm and a thickness of 50 μm and having a large number of through holes 8 (not shown in FIG. 1). The through-hole 8 is provided in a direction perpendicular to the plate surface, has a mortar shape, an opening area on one plate surface is larger than an opening area on the other plate surface, a diameter of one opening is 100 μm, and Is 10 μm. The through holes 8 are arranged at an equal pitch at intervals of 140 μm. The vibration plate 4 is connected to the piezoelectric vibrator 3 via the Au electrode 6.
Is fixedly connected to the piezoelectric vibrator 3 in one end face.

FIG. 2 is a perspective view of the ultrasonic spray device provided with the ultrasonic spray device noise preventing structure of FIG. Piezoelectric vibrator 3
Is partially fixed to a fixed object, and the support 1 is also partially fixed to another fixed object. In this way, the ultrasonic spraying device is supported at a predetermined position and can realize stable atomization.

When an ultrasonic signal having a frequency substantially equal to the resonance frequency of the complex of the piezoelectric vibrator 3 and the vibration plate 4 is applied to the piezoelectric vibrator 3 when the ultrasonic spraying device shown in FIG. Is excited. At this time, the frequency of the AC signal substantially matches one of the resonance frequencies of the piezoelectric vibrator 3 alone. Since the vibrating plate 4 has a structure in which the vibrating plate 4 is integrally connected and fixed to at least one end face of the piezoelectric vibrator 3, the vibrating plate 4 vibrates with the piezoelectric vibrator 3 with the excitation of the piezoelectric vibrator 3. Vibration is performed in such a manner that the fixed portion with the plate 4 is a fixed end. When a liquid is supplied to the diaphragm 4, the liquid is guided to a through hole 8 provided in the diaphragm 4 by capillary action. The liquid becomes fine and uniform particles, flows out to the outlet side of the through hole 8, and is efficiently atomized. At this time, since the support 1 is fixed to the fixed object and the vibration damping material 2 is in contact with the distal end portion of the vibration plate 4, the noise accompanying the driving of the ultrasonic spray device is not reduced without lowering the atomizing function. Can be erased.

[0013]

According to the ultrasonic spray device noise prevention structure of the present invention, the support member is fixed to the fixed object, and the vibration damping material comes into contact with a part of the vibration plate of the ultrasonic spray device, so that the atomizing function is achieved. Noise caused by atomization can be prevented without lowering the noise.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an ultrasonic spraying device supported by an ultrasonic spraying device noise prevention structure of the present invention.

FIG. 2 is a perspective view of an ultrasonic spray device provided with the ultrasonic spray device noise prevention structure of FIG. 1;

FIG. 3 is a cross-sectional view showing one embodiment of a conventional ultrasonic atomizer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support body 2 Vibration damping material 3 Piezoelectric vibrator 4 Vibration plate 5 Piezoelectric ceramic 6 Au electrode 7 Au electrode 8 Through hole

Continued on the front page (72) Inventor Sumio Tsuneda 6-13-11 Sotokanda, Chiyoda-ku, Tokyo Mikuni Corporation (72) Inventor Koji Toda 1-49-18, Futaba, Yokosuka-shi, Kanagawa (56) Reference JP-A-59-228967 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05B 17/06 B05D 1/02 B06B 1/06 G10K 11/16

Claims (2)

(57) [Claims] 1. A piezoelectric vibrator comprising: a rectangular piezoelectric vibrator; and a rectangular perforated vibrating plate. The vibrating plate is integrally and continuously fixed on at least one end face of the piezoelectric vibrator. The fixed portions where the diaphragms are fixed to each other are located in an edge region of one side of each of the two, and the two sides are provided in an ultrasonic spraying device that is parallel to each other, and the structure is provided with the excitation of the piezoelectric vibrator. A noise prevention structure for supplying a liquid to the vibration plate when the vibration plate vibrates in a form having the fixed portion as a fixed end, thereby preventing a noise generated when spraying the liquid is generated. And a vibration damping material gripped by the support, wherein the support is fixed to a fixed object, one of the two plate surfaces of the diaphragm is a first plate surface, and the other is a first plate surface. When referred to as the second plate surface, the vibration damping material is provided on the first plate. And the area occupied by the area A and the area B in the diaphragm is a different one of the areas facing the side of the diaphragm on the fixing portion side. The area occupied by the area A and the area B in the diaphragm is smaller than the area of the first plate surface and the second plate surface. The region B is opposed to each other. 2. The ultrasonic spray apparatus according to claim 1, wherein the edge area of the other side occupied by the area A and the area B in the diaphragm is located at a center of the side. Noise prevention structure.