CN111163869A - Vibrator for atomization, atomization unit, atomization device, and method for driving atomization device - Google Patents
Vibrator for atomization, atomization unit, atomization device, and method for driving atomization device Download PDFInfo
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- CN111163869A CN111163869A CN201880061606.2A CN201880061606A CN111163869A CN 111163869 A CN111163869 A CN 111163869A CN 201880061606 A CN201880061606 A CN 201880061606A CN 111163869 A CN111163869 A CN 111163869A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
- B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
- B05B17/0638—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers spray being produced by discharging the liquid or other fluent material through a plate comprising a plurality of orifices
- B05B17/0646—Vibrating plates, i.e. plates being directly subjected to the vibrations, e.g. having a piezoelectric transducer attached thereto
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
- B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
- B05B17/0653—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F6/00—Air-humidification, e.g. cooling by humidification
- F24F6/12—Air-humidification, e.g. cooling by humidification by forming water dispersions in the air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Dispersion Chemistry (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Special Spraying Apparatus (AREA)
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Abstract
The invention provides an oscillator for atomization, an atomization unit, an atomization device and a driving method of the atomization device, wherein the oscillator for atomization, the atomization unit and the atomization device can realize proper atomization based on the liquid level of a liquid storage tank. The oscillator 10 for atomization of the present invention includes a plate-shaped piezoelectric oscillator 11, and electrodes provided on one surface 11b and the other surface 11a of the piezoelectric oscillator 11, respectively, wherein the electrode provided on the one surface 11b includes a center electrode 21 disposed in a central portion of the piezoelectric oscillator 11, and an annular outer peripheral electrode 22 disposed around an outer periphery of the center electrode 21 and electrically isolated from the center electrode 21.
Description
Technical Field
The present invention relates to an atomizing vibrator for applying ultrasonic vibration to an atomizing liquid to atomize the liquid, an atomizing unit including the atomizing vibrator, an atomizing device including the atomizing unit, and a method of driving the atomizing device. More particularly, the present invention relates to an atomizing vibrator which is suitably provided in a reservoir tank in which a water level (liquid level) of an atomizing liquid is lowered by atomization.
Background
Conventionally, an ultrasonic vibration method has been used as a method for atomizing a liquid. In an atomizing apparatus using an ultrasonic vibration method, an ultrasonic vibrator is provided at the bottom of a liquid reservoir for storing a liquid for atomization. When a high-frequency voltage is applied to the ultrasonic transducer, the liquid for atomization in the liquid storage tank is atomized by high-frequency vibration. The atomized liquid is discharged to the outside as mist by a blower or the like. Such an atomizing device is put to practical use as a humidifier, for example.
In the atomizing device using the ultrasonic vibration method, the atomizing amount varies with the distance from the ultrasonic vibrator to the liquid surface of the liquid storage tank, that is, the liquid level of the liquid surface for atomization. In this case, in order to maintain the liquid surface height (liquid level) of the reservoir at a level near the peak of the atomization amount, it is necessary to supply the reservoir with the atomization liquid in an amount equivalent to the amount consumed for forming the mist by the replenishment tank. For example, as the atomizing device, a mist generator disclosed in patent document 1 can be cited.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. H05-208151
Disclosure of Invention
Problems to be solved by the invention
However, the atomizer described in patent document 1 has a problem that, since a supply tank needs to be provided in addition to the liquid reservoir, the entire structure of the atomizer is complicated, and the degree of freedom in shape (design) design is limited. On the other hand, when the supply tank is not used, there is a problem that the liquid level of the liquid storage tank cannot be maintained at a height at which the atomization amount reaches the peak due to consumption of the liquid for atomization, and the atomization amount varies drastically with the liquid level of the liquid storage tank.
In view of the above-described problems of the prior art, it is an object of the present invention to provide an atomizing vibrator that can achieve appropriate atomization based on the liquid level of a liquid reservoir and does not require a supply tank, an atomizing unit including the atomizing vibrator, an atomizing device including the atomizing unit, and a method of driving the atomizing device.
Means for solving the problems
The nebulizer according to claim 1 of the present invention includes a plate-shaped piezoelectric vibrator and electrodes provided on one surface and the other surface of the piezoelectric vibrator, respectively, wherein the electrode provided on the one surface of the piezoelectric vibrator includes a center electrode disposed in a central portion of the piezoelectric vibrator and an annular outer peripheral electrode disposed so as to surround an outer periphery of the center electrode and to be electrically isolated from the center electrode.
The oscillator for atomization according to claim 2 of the present invention is characterized in that the outer circumferential electrode is electrically isolated into at least two or more annular electrodes with an annular gap portion therebetween.
The oscillator for atomization in 3 aspects of the present invention includes a disc-shaped piezoelectric oscillator and circular electrodes provided on one surface and the other surface of the piezoelectric oscillator, respectively, wherein the electrode provided on the one surface of the piezoelectric oscillator includes a center electrode disposed at a central portion of the piezoelectric oscillator and an annular outer peripheral electrode disposed concentrically with and electrically isolated from the center electrode.
The oscillator for atomization according to claim 4 of the present invention is characterized in that the outer peripheral electrode is at least two or more annular electrodes electrically isolated from each other via annular gap portions provided concentrically.
The nebulizer according to claim 5 of the present invention comprises a plate-shaped piezoelectric vibrator and electrodes provided on one surface and the other surface of the piezoelectric vibrator, wherein the electrode provided on the one surface of the piezoelectric vibrator includes a center electrode arranged eccentrically with respect to a center in the one surface of the piezoelectric vibrator, and an annular outer peripheral electrode arranged so as to surround an outer periphery of the center electrode and to be electrically isolated from the center electrode.
The nebulizer according to claim 6 of the present invention is the nebulizer according to claim 5 of the present invention, wherein the piezoelectric vibrator is a disc.
The oscillator for atomization according to claim 7 of the present invention is characterized in that the outer peripheral electrode is electrically isolated by a gap portion as at least two or more electrodes that sequentially surround the outer periphery of the center electrode in a layer shape.
An atomizing unit according to claim 8 of the present invention includes any one of the atomizing vibrator according to claim 1, claim 3, claim 5, or claim 6, and a driving unit that drives the atomizing vibrator, wherein the driving unit includes a switch unit that controls opening and closing of the electric current to the outer peripheral electrode, and a control unit that switches an open/closed state of the switch unit based on an output signal of a liquid level detecting unit that detects a liquid level of the liquid reservoir.
An atomizing unit according to a 9 th aspect of the present invention includes the atomizing vibrator according to any one of the 2 nd, 4 th, or 7 th aspects of the present invention, and a driving unit that drives the atomizing vibrator, wherein the driving unit includes a switch unit that is provided in correspondence with each of the plurality of outer peripheral electrodes and controls on/off of energization to the corresponding outer peripheral electrode, and a control unit that switches an on/off state of the switch unit based on an output signal of a liquid level detection unit that detects a liquid level of the liquid reservoir.
An atomizing device according to a 10 th aspect of the present invention is the atomizing unit according to the 8 th aspect of the present invention, wherein the atomizing vibrator is provided at a bottom portion of the reservoir tank, and the control unit switches the opening/closing unit from a closed state (ON) to an open state (OFF) when the liquid level of the reservoir tank falls to a predetermined value based ON an output signal of the liquid level detection unit.
An atomization device according to claim 11 of the present invention includes the atomization unit according to claim 9 of the present invention, a reservoir for storing an atomization liquid, and a liquid level detection unit for detecting a liquid level in the reservoir, wherein the atomization vibrator is provided at a bottom of the reservoir, and the control unit gradually increases an outer peripheral electrode, which switches the open/close unit from a closed state (ON) to an open state (OFF), toward a central portion as the liquid level in the reservoir decreases, based ON an output signal of the liquid level detection unit.
A method of driving an atomizing device according to a 12 th aspect of the present invention is a method of driving an atomizing device in which any one of the atomizing vibrators according to the 1 st, 3 rd, 5 th, or 6 th aspects of the present invention is provided at a bottom of a reservoir for storing an atomizing liquid, wherein when a liquid level of the reservoir falls to a predetermined value, the energization of the outer peripheral electrode is stopped.
A method of driving an atomizer according to claim 13 of the present invention is a method of driving an atomizer according to any one of the atomizing vibrators according to claim 2,4 or 7 of the present invention provided at a bottom of a reservoir tank for storing an atomizing liquid, wherein the outer peripheral electrode to which energization is stopped is gradually increased toward a central portion as a liquid level of the reservoir tank is lowered.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the oscillator for atomization of the present invention, when the liquid level of the liquid reservoir is at a high liquid level, the center electrode and the outer peripheral electrode are energized to atomize the liquid in accordance with the high liquid level, and when the liquid level of the liquid reservoir decreases with the consumption of the liquid for atomization, the energization of the outer peripheral electrode is stopped and only the center electrode is energized, thereby achieving atomization in accordance with the low liquid level. Therefore, when the liquid level of the liquid storage tank is lowered, proper atomization can be realized, and stable atomization can be realized without a replenishing tank.
Drawings
Fig. 1 is a schematic configuration diagram of an atomizing device of the present invention.
Fig. 2 is a schematic cross-sectional view of the atomizing vibrator according to the present embodiment.
Fig. 3 is a view showing the other side of the atomizing vibrator of fig. 2.
Fig. 4 is a view showing one surface side of the oscillator for atomization according to embodiment 1.
Fig. 5 is a view showing one surface side of the oscillator for atomization according to embodiment 2.
Fig. 6 is a view showing one surface side of the oscillator for atomization according to embodiment 3.
Fig. 7 is a view showing one surface side of the oscillator for atomization according to embodiment 4.
Fig. 8 is a view showing one surface side of an atomizing vibrator according to another embodiment.
Fig. 9 is a view showing one surface side of an atomizing vibrator according to another embodiment.
Fig. 10 is a view showing one surface side of an atomizing vibrator according to another embodiment.
Fig. 11 is a view showing one surface side of an atomizing vibrator according to another embodiment.
Fig. 12 is a diagram showing changes in the atomization amount with respect to the liquid level when current is applied only to the center electrode and when current is applied to both the center electrode and the outer peripheral electrode in the oscillator for atomization according to embodiment 1.
Fig. 13 is a graph showing a change in the atomization amount with respect to the liquid level when the high liquid level mode and the low liquid level mode are switched.
Fig. 14 is a graph showing changes in the atomization amount with respect to the liquid level in the high liquid level mode, the middle liquid level mode, and the low liquid level mode 3 atomization modes.
Description of the symbols
W atomizing liquid, 1 atomizing device, 2 reservoir, 2A bottom surface, 3 atomizing unit, 5 level sensor (level detecting unit), 6 control unit, 7 high-frequency emitting unit, 10A,10B,10C,10D atomizing vibrator, 11 piezoelectric vibrator, 11A other surface, 11B one surface, 12 electrode (other surface side), 12A connecting part, 20A,20B,20C,20D electrode (one surface side), 21 center electrode (1 st embodiment), 22 outer peripheral electrode (1 st embodiment), 23,44 gap part, 24,25,26,33,34,45,46,47,54,55,56 power supply wiring, 27,48,49 on-off switch, 31 center electrode (2 nd embodiment), 31A,51A,52A connecting piece, 32 outer peripheral electrode (2 nd embodiment), 32A,52B,53A notch part, 41 center electrode (3 rd embodiment), and, 42 st outer peripheral electrode (embodiment 3), 43 nd outer peripheral electrode (embodiment 3), 51 center electrode (embodiment 4), 52 st 1 outer peripheral electrode (embodiment 4), 53 nd outer peripheral electrode (embodiment 4), and 60 drive unit
Detailed Description
Embodiments of an atomizing vibrator, an atomizing unit, an atomizing device, and a method of driving an atomizing device according to the present invention will be described below with reference to the drawings. Here, an example of the atomizing vibrator and the atomizing device including the atomizing unit according to the present invention will be described.
Fig. 1 is a schematic configuration diagram of an atomizing apparatus 1 including an atomizing vibrator 10 according to the present embodiment. The atomization device 1 of the present embodiment includes a liquid tank 2 that stores an atomization liquid, and an atomization unit 3 that atomizes the atomization liquid W stored in the liquid tank 2.
The liquid reservoir 2 is a reservoir for storing the liquid W for atomization, and a through hole 4 for attaching the oscillator 10 for atomization of the atomizing unit 3 is formed in a bottom portion (bottom surface) 2A. The liquid tank 2 is made of, for example, synthetic resin or metal material. In the present embodiment, the reservoir tank 2 is accommodated in an unillustrated atomizer main body, is held by a predetermined support portion, and is detachably provided in the atomizer main body. The reservoir 2 is preferably capable of being stored in a continuously nebulizable volume without replenishing the nebulizing liquid W for a given period of time.
In the present embodiment, tap water is used as the atomizing liquid W, but the atomizing liquid W is not limited to water such as tap water, and may be any liquid as long as it can be atomized, such as a liquid medicine or a fragrant liquid.
A liquid level sensor (liquid level detection unit) 5 for detecting the liquid level of the stored atomization liquid W is provided in the liquid reservoir 2. In the present embodiment, the liquid level sensor 5 may be any type of sensor as long as it can detect the liquid level of the atomizing liquid W in the liquid reservoir 2. Examples of the liquid level sensor 5 include a capacitance type, a weight type, an optical type, a laser type, an electric wave type, an ultrasonic type, and a floating bead type, but the liquid level sensor of the present invention is not limited to these types.
The atomizing unit 3 includes an atomizing vibrator 10 and a driving unit 60 for driving the atomizing vibrator 10. First, the atomizing vibrator 10 will be described with reference to a schematic cross-sectional view of the atomizing vibrator 10 of fig. 2.
The atomizer vibrator 10 includes a plate-shaped piezoelectric vibrator 11 and a pair of layered electrodes 12 and 20 formed to sandwich the piezoelectric vibrator 11. In the present embodiment, the piezoelectric vibrator 11 has a disc shape, and an electrode 12 having a circular shape and a slightly smaller outer diameter than the piezoelectric vibrator 11 is formed concentrically with the piezoelectric vibrator 11 by plating or the like on one surface side (hereinafter, also referred to as "the other surface") 11a of the piezoelectric vibrator 11 on the atomizing liquid W side. On one surface (hereinafter, also referred to as "one surface") 11b on the opposite side of the atomizing liquid W, an electrode 20 having a circular shape and an outer diameter slightly smaller than that of the piezoelectric vibrator 11 is formed concentrically with the piezoelectric vibrator 11 by plating or the like. Here, a disc-shaped piezoelectric vibrator is described as an example, but the piezoelectric vibrator of the present invention is not limited to a disc shape, and may be a plate shape. The electrode 20 will be described in detail below.
The piezoelectric vibrator 11 is formed by polarizing a piezoelectric material such as a piezoelectric ceramic having a predetermined thickness in a thickness direction. The piezoelectric vibrator 11 contracts and extends in accordance with the direction of a high-frequency voltage (hereinafter, also referred to as a "high-frequency drive signal") applied via the electrodes 12 and 20, and thus can convert electric energy into mechanical energy. Examples of the piezoelectric ceramic include perovskite type oxides such as lead zirconate titanate (PZT) and lead zirconate titanate niobate (PZTN), but the present invention is not limited to these.
In the present embodiment, the atomizing vibrator 10 is fitted into the through hole 4 formed in the bottom portion 2A of the reservoir through the elastic packing 14 with the electrode 12 being on the upper side, and the electrode 12 disposed on the other surface 11a is disposed on the atomizing liquid W side of the reservoir 2. The elastic pad 14 is formed by annularly forming an elastic material such as silicone rubber, for example. The elastic spacer 14 may have an annular holding groove on its inner circumferential surface for holding the piezoelectric vibrator 11 including the electrodes 12 and 20. With this structure, the piezoelectric vibrator 11 including the electrodes 12 and 20 is fitted into the through hole 4 formed in the bottom 2A of the reservoir 2 with the peripheral edge portion thereof held by the elastic packing 14.
In order to supply power from the side of the one surface 11b of the piezoelectric vibrator 11 in a state where the elastic pad 14 is attached, the electrode 12 disposed on the other surface 11a of the piezoelectric vibrator 11 includes a connection portion 12A of a tongue piece stretched to the side of the one surface 11b of the piezoelectric vibrator 11. As described above, the outer diameter of the electrode 12 is slightly smaller than the outer diameter of the piezoelectric vibrator 11, and the protective layer 15 covering the electrode 12 is formed on the other surface 11a of the piezoelectric vibrator 11 for the purpose of preventing the electrode 12 from directly contacting the atomizing liquid W. The protective layer 15 may be formed of, for example, a metal foil such as stainless steel or titanium, or a plated metal protective film or a resin coating film. Fig. 3 shows the other surface 11a side of the piezoelectric vibrator 11 before the protective layer 15 is formed.
In the atomizing vibrator 10A according to embodiment 1, the electrode 20A provided on the side of the one surface 11b of the disc-shaped piezoelectric vibrator 11 includes a circular center electrode 21 and an annular outer peripheral electrode 22 surrounding the outer periphery of the center electrode 21 and disposed concentrically with the center electrode 21.
The circular center electrode 21 has an outer diameter smaller than that of the piezoelectric vibrator 11, and is concentrically disposed in the center of the piezoelectric vibrator 11. The annular outer peripheral electrode 22 has an inner diameter slightly larger than the outer diameter of the center electrode 21, an outer diameter substantially equal to or slightly smaller than the electrode 12, and is disposed concentrically with the center electrode 21. The center electrode 21 and the outer peripheral electrode 22 are electrically isolated from each other by an annular gap 23.
Thus, according to the atomizing vibrator 10A of embodiment 1, the energization to the outer circumferential electrode 22 is controlled by the on-off switch 27, and the driving region can be switched to 2 stages (large diameter, small diameter) in the radial direction by one atomizing vibrator.
Fig. 5 is a view showing the atomizing vibrator 10B of embodiment 2 on the side of one surface 11B. The atomizing vibrator 10B of embodiment 2 is considered to be connected to a power feeding wire connected to the electrode 20B provided on the one surface 11B. Specifically, in the atomizing vibrator 10B according to embodiment 2, the electrode 20B provided on the one surface 11B of the piezoelectric vibrator 11 includes a center electrode 31 having a circular electrode body and an annular outer peripheral electrode 32 disposed concentrically with the center electrode 31.
In the center electrode 31, a connection piece 31A for connecting the power supply wiring 33 extends from the electrode main body to the outer edge of the piezoelectric vibrator 11 in the radial direction. In order to achieve electrical insulation from the connection piece 31A, a part of the annular portion of the outer peripheral electrode 32 is notched in the radial direction. Further, like the outer peripheral electrode 32, even if a part of the annular portion is notched in the radial direction, it is included in the scope of the outer peripheral electrode of the present invention if the entire annular portion is annular.
Power supply wirings 33 and 34 are connected to the connection tab 31A of the center electrode 31 and the vicinity of the notch 32A of the outer peripheral electrode 32, respectively. Thus, the atomizing vibrator 10B according to embodiment 2 has an advantage that the power feeding wires 33 and 34 of the electrode 20B provided on the one surface 11B can be integrated at one position. In the atomizer vibrator 10B according to embodiment 2, the same components as those of the atomizer vibrator 10A according to embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.
Fig. 6 is a view showing the atomizing vibrator 10C according to embodiment 3 on the side of one surface 11 b. The atomizing vibrator 10C of embodiment 3 has the outer diameter of the center electrode 41 constituting the electrode 20C provided on the one surface 11b slightly smaller than the center electrode 21 of embodiment 1. The annular outer circumferential electrode arranged concentrically with the center electrode 41 is composed of a 1 st outer circumferential electrode 42 and a 2 nd outer circumferential electrode 43 electrically separated into two in the radial direction by an annular gap 44.
The center electrode 41, the 1 st outer circumferential electrode 42, and the 2 nd outer circumferential electrode 43 are connected to power feeding wirings 45,46, and 47, respectively.
According to the atomizing vibrator 10C of embodiment 3, the energization to the 1 st outer circumferential electrode 42 and the 2 nd outer circumferential electrode 43 is controlled by the on-off switches 48 and 49, and the driving region can be switched to 3 stages (large diameter, medium diameter, small diameter) in the radial direction by one atomizing vibrator. In the atomizer vibrator 10C according to embodiment 3, the same components as those of the atomizer vibrator 10A according to embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.
Fig. 7 is a view showing the atomizing vibrator 10D according to embodiment 4 on the side of one surface 11 b. The atomizing vibrator 10D of embodiment 4 is considered to be connected to a power feeding wire connected to the electrode 20D provided on the one surface 11 b. Specifically, in the atomizer vibrator 10D according to embodiment 4, the electrode 20D provided on the one surface 11b of the piezoelectric vibrator 11 includes a center electrode 51 having a circular electrode body, and a 1 st outer circumferential electrode 52 and a 2 nd outer circumferential electrode 53 arranged concentrically with the center electrode 51.
In the center electrode 51, a connection piece 51A for connecting the power supply wiring 54 extends from the electrode main body to the outer edge of the piezoelectric vibrator 11 in the radial direction. In order to achieve electrical insulation from connection tab 51A, 1 st outer circumferential electrode 52 includes notch 52B having a portion of the annular portion notched in the radial direction. In order to electrically insulate the connection pad 52A described later, the 2 nd outer circumferential electrode 53 includes a notch 53A in which a part of the annular portion is notched in the radial direction by a width larger than that of the notch 52B of the 1 st outer circumferential electrode 52. In addition, even if a part of the annular portion is notched in the radial direction, like the 1 st outer circumferential electrode 52 and the 2 nd outer circumferential electrode 53, the entire annular portion is included in the scope of the annular outer circumferential electrode of the present invention.
At the end of the notch 52B of the 1 st outer peripheral electrode 52, a connection piece 52A for connecting the power supply wiring 55 extends to the outer edge of the piezoelectric vibrator 11 in the radial direction. Power supply wirings 54,55,56 are connected to the vicinities of the connection tab 51A of the center electrode 51, the connection tab 52A of the 1 st outer circumferential electrode 52, and the cutout 53A of the 2 nd outer circumferential electrode 53, respectively.
Thus, the atomizer oscillator 10D according to embodiment 4 has an advantage that the power feeding wires 54,55,56 of the electrode 20D provided on the one surface 11b can be integrated at one location. In the atomizer vibrator 10D according to embodiment 4, the same components as those of the atomizer vibrator 10C according to embodiment 3 are denoted by the same reference numerals, and description thereof is omitted.
In the above embodiments, the center of the center electrode is set at the center of the piezoelectric vibrator 11, but the center of the center electrode does not need to coincide with the center of the piezoelectric vibrator 11, and the outer peripheral electrode may surround the center electrode in a state electrically isolated from the center electrode. That is, the center of the center electrode may be arranged eccentrically with respect to the in-plane center of the piezoelectric resonator, and the outer circumferential electrode may be arranged around the outer circumference of the center electrode so as to be eccentric with respect to the in-plane center of the piezoelectric resonator in accordance with the eccentricity of the center electrode.
Fig. 8 to 11 show examples in which the center electrode and the outer peripheral electrode are eccentrically disposed. The center electrode and the outer peripheral electrode shown in the figures are eccentric with respect to the in-plane center P1 of the one surface 11B of the piezoelectric vibrator 11 with respect to the center electrode 31 and the outer peripheral electrode 32 of the atomizing vibrator 10B according to embodiment 2 shown in fig. 5. Specifically, fig. 8 shows an example in which the center P2 of the center electrode 31 is eccentric by 3% from the in-plane center P1 of the piezoelectric vibrator 11 toward the direction in which the connection piece 31A is formed, assuming that the outer diameter of the outer peripheral electrode 32 is 100%. Similarly, fig. 9 shows an example in which the center P2 of the center electrode 31 is eccentric by 3% in the direction opposite to the direction in which the connection tab 31A is formed, fig. 10 shows an example in which the center P2 of the center electrode 31 is eccentric by 6% in the direction opposite to the direction in which the connection tab 31A is formed, and fig. 11 shows an example in which the center P2 of the center electrode 31 is maximally eccentric in the direction opposite to the direction in which the connection tab 31A is formed.
In the above-described embodiment, one or two outer peripheral electrodes are provided, but the present invention is not limited to this. That is, the outer peripheral electrodes may be constituted by the 1 st to nth outer peripheral electrodes (n is an integer of 2 or more) arranged in this order from the center electrode side, and the 1 st to nth outer peripheral electrodes may be arranged in the same plane so as to be spaced apart from each other so as to surround the inner adjacent outer peripheral electrodes. Thus, the electrodes constituting the outer peripheral electrode surround the outer periphery of the center electrode in a layer-like manner in order.
In all the cases mentioned above, it is preferable that the n-th outer peripheral electrode (outer peripheral electrodes 22,32,43,53) located on the outermost side has an outer diameter equal to or less than the outer diameter of the electrode 12 provided on the other surface 11a of the piezoelectric vibrator 11.
In each of the embodiments, the distance between the center electrode and the outer circumferential electrode and the distance between the outer circumferential electrodes are not particularly limited and may be a distance that can achieve electrical insulation, but from the viewpoint of causing the piezoelectric effect to be produced in the piezoelectric vibrator 11, it is preferable that the distance be narrow.
Next, the atomizing unit 3 of the present embodiment will be described with reference to fig. 1. The atomizing unit 3 includes an atomizing vibrator 10 and a driving unit 60 for driving the atomizing vibrator 10. The driving unit 60 outputs a high-frequency driving signal to the electrodes 12,20 of the atomizing vibrator 10, and includes a control unit 6, a high-frequency emitting unit 7, and a switch unit 8 having an on-off switch 27(48, 49).
The control unit 6 is connected to the liquid level sensor 5, and outputs a command signal for switching between a closed state (ON) and an open state (OFF) of the ON/OFF switch 27(48,49) of the switch unit 8 to the switch unit 8 based ON an output of the liquid level sensor 5.
The high-frequency transmitter 7 is connected to an external power supply (not shown) (for example, a 50Hz commercial power supply), generates a high-frequency drive signal by the external power supply, and outputs the high-frequency drive signal to the electrodes 12 and 20 of the atomizing vibrator 10.
The switch unit 8 switches the open/close switches 27(48,49) to either a closed state (ON) or an open state (OFF) based ON a command signal from the control unit 6. In the case of using the atomizing unit 3 of the atomizing vibrator 10A of embodiment 1 and the atomizing vibrator 10B of embodiment 2, when the on-OFF switch 27 is in the open state (OFF), the high-frequency drive signal output from the high-frequency emitting unit 7 is supplied only to the center electrode 21 or the center electrode 31. In the case of the atomizing unit 3 using the atomizing vibrator 10C of embodiment 3 and the atomizing vibrator 10D of embodiment 4, when the on-OFF switches 48 and 49 are in the open state (OFF), the high-frequency drive signal outputted from the high-frequency emitting unit 7 is supplied only to the center electrode 41 or 51. Subsequently, only when the open/close switch 49 is in the open state (OFF), the high-frequency drive signal outputted from the high-frequency emitting portion 7 is supplied only to the center electrode 41 or 51 and the 1 st outer peripheral electrode 42 or 52. In fig. 1, the power supply wiring from the high-frequency emitting unit 7 to the electrode 12 of the atomizing vibrator 10 is not shown.
The atomization amount of the atomizing liquid W by the atomizing vibrator 10 varies depending on the distance from the other surface 11a of the piezoelectric vibrator 11 to the liquid surface of the atomizing liquid W, that is, depending on the liquid level of the reservoir 2. Fig. 12 shows changes in the atomization amount with respect to the liquid level in the atomization vibrator 10A according to embodiment 1, when current is applied only to the center electrode 21 and when current is applied to both the center electrode 21 and the outer peripheral electrode 22. In fig. 12, the broken line indicates a case where current is applied only to the center electrode 21, and the solid line indicates a case where current is applied to both the center electrode 21 and the outer circumferential electrode 22.
As can be seen from fig. 12, the liquid level of the atomizing vibrator 10, which indicates the peak of the atomizing amount, differs depending on the diameter of the electrode to which the current is applied. As the oscillator 10 for atomization, when electricity is applied to both the center electrode 21 and the outer peripheral electrode 22 (the diameter of the applied electrode is large), the atomization amount peaks at a high liquid level, and when electricity is applied only to the center electrode 21 (the diameter of the applied electrode is small), the atomization amount peaks at a low liquid level. The atomization amount when current is applied to both the center electrode 21 and the outer peripheral electrode 22 is reversed from the atomization amount when current is applied only to the center electrode 21, with the liquid level L (for example, 50mm) as a boundary.
Therefore, in the present embodiment, the controller 6 gradually switches the current to the electrode 20A of the atomizing vibrator 10 based on the output of the liquid level sensor 5 with the liquid level L (for example, 50mm) of the reservoir tank 2 set as a threshold value. Specifically, the control unit 6 stops the energization of the outer peripheral electrode 22 when the liquid level L of the reservoir tank 2 reaches a threshold value due to atomization based on the output of the liquid level sensor 5.
Next, an embodiment of the atomizing device 1 using the atomizing vibrator 10A of embodiment 1 will be described with reference to fig. 13. In the present embodiment, the atomization mode when the liquid level of the reservoir tank 2 detected by the liquid level sensor 5 exceeds the threshold value L is set to the "high liquid level mode", and the atomization mode when the liquid level of the reservoir tank 2 is equal to or less than the threshold value L is set to the "low liquid level mode". The switching of the atomization mode is performed by the control unit 6 based on the output of the liquid level sensor 5.
In the "high liquid level mode", the control unit 6 switches the open/close switch 27 of the switch unit 8 to the closed state (ON) based ON the output of the liquid level sensor 5. The high-frequency transmitting section 7 outputs a high-frequency driving signal to both the center electrode 21 and the outer circumferential electrode 22 via the switch section 8. Thus, the atomizing vibrator 10A can perform appropriate atomization corresponding to a high liquid level.
When the atomization liquid W is consumed by atomization and the liquid level of the atomization liquid W in the reservoir tank 2 falls to the threshold L, the atomization mode is switched from the "high liquid level mode" to the "low liquid level mode" based on the output of the liquid level sensor 5.
In the "low fluid level mode", the control unit 6 switches the open/close switch 27 of the switch unit 8 to the open state (OFF) based on the output of the fluid level sensor 5. The high-frequency transmitting section 7 outputs a high-frequency drive signal only to the center electrode 21 via the switch section 8. Thus, the atomizing vibrator 10A can perform appropriate atomization corresponding to a low liquid level. In the "low liquid level mode", when the liquid level of the reservoir tank 2 exceeds the threshold value L as the atomization liquid W is supplied, the high-frequency emission unit 7 switches to the "high liquid level mode", and outputs a high-frequency drive signal to both the center electrode 21 and the outer peripheral electrode 22 via the switch unit 8.
As described above, according to the atomization device 1 of the present embodiment, when the liquid level of the reservoir tank 2 is equal to or lower than the threshold value L, the energization to the outer peripheral electrode 22 is stopped and the energization is performed only to the center electrode 21, so that appropriate atomization can be achieved based on the liquid level. Therefore, even if the liquid level of the liquid storage tank 2 is greatly reduced along with atomization, the reduction of the atomization amount can be controlled within a certain range, and stable atomization can be realized without a supply tank.
In the above-described embodiment, two atomization modes, i.e., the "high liquid level mode" and the "low liquid level mode", are set, and the diameter of the energized electrode is switched to two stages based on the liquid level by one atomization oscillator, thereby realizing atomization corresponding to the liquid level. Fig. 14 is a graph showing changes in the atomization amount with respect to the liquid level in the atomization modes, i.e., the "high liquid level mode", the "medium liquid level mode", and the "low liquid level mode". As shown in embodiment 3 (4), when the atomizing vibrator 10C (10D) including two outer peripheral electrodes, i.e., the 1 st outer peripheral electrode 42(52) and the 2 nd outer peripheral electrode 43(53), is used, three atomizing modes, i.e., "high liquid level mode", "medium liquid level mode", and "low liquid level mode", can be set.
In the "high liquid level mode", the current is passed to the center electrode 41(51), the 1 st outer peripheral electrode 42(52), and the 2 nd outer peripheral electrode 43 (53). In the "middle level mode", the current supply to the 2 nd outer circumferential electrodes 43(53) is stopped, and the current supply is performed only to the center electrodes 41(51) and the 1 st outer circumferential electrodes 42 (52). In the "low liquid level mode", the current supply to the 1 st outer circumferential electrode 42(52) and the 2 nd outer circumferential electrode 43(53) is stopped, and the current supply is performed only to the center electrode 41 (51).
When the liquid level of the tank 2 reaches the 1 st threshold value L1, the mode is switched from the "high liquid level mode" to the "medium liquid level mode", and when the liquid level of the tank 2 reaches the 2 nd threshold value L2 lower than the 1 st threshold value, the mode is switched from the "medium liquid level mode" to the "low liquid level mode". In this embodiment, as shown in fig. 6 and 7, the switch unit 8 includes two switches, i.e., on-off switches 48 and 49.
According to this embodiment, as can be seen from fig. 14, appropriate atomization can be achieved based on each liquid level.
The vibrator for atomization, the atomizing unit, the atomizing device, and the method for driving the atomizing device according to the present invention are not limited to the atomizing device without the sub-tank, and are also applicable to the atomizing device provided with the sub-tank. According to the present invention, the atomization device provided with the auxiliary tank can achieve appropriate atomization based on the liquid level of the liquid storage tank after the auxiliary tank becomes empty.
Industrial applicability
The oscillator for atomization of the invention can realize proper atomization based on the liquid level of the liquid storage tank, and is particularly suitable for an atomization device which is not provided with a supply tank for keeping the liquid level of the liquid storage tank to be certain.
Claims (13)
1. An atomizing vibrator comprising a plate-like piezoelectric vibrator and electrodes provided on one surface and the other surface of the piezoelectric vibrator, respectively,
the electrode provided on the one surface of the piezoelectric vibrator includes a center electrode disposed in a central portion of the piezoelectric vibrator, and an annular outer peripheral electrode disposed so as to surround an outer periphery of the center electrode and electrically isolated from the center electrode.
2. The oscillator according to claim 1, wherein the outer peripheral electrode is electrically isolated into at least two annular electrodes with an annular gap portion therebetween.
3. An atomizing vibrator comprising a disc-shaped piezoelectric vibrator and circular electrodes provided on one surface and the other surface of the piezoelectric vibrator, respectively,
the electrode provided on the one surface of the piezoelectric vibrator includes a center electrode disposed in a central portion of the piezoelectric vibrator, and an annular outer peripheral electrode disposed concentrically with and electrically isolated from the center electrode.
4. The oscillator according to claim 3, wherein the outer circumferential electrode is electrically isolated into at least two or more annular electrodes via annular gap portions provided concentrically.
5. An atomizing vibrator comprising a plate-like piezoelectric vibrator and electrodes provided on one surface and the other surface of the piezoelectric vibrator, respectively,
the electrode provided on the one surface of the piezoelectric vibrator includes a center electrode arranged eccentrically with respect to a center in the one surface of the piezoelectric vibrator, and an annular outer peripheral electrode arranged so as to surround an outer periphery of the center electrode and to be electrically isolated from the center electrode.
6. The vibrator for atomization according to claim 5, wherein the piezoelectric vibrator has a disc shape.
7. The oscillator for atomization according to claim 5 or 6, wherein the outer peripheral electrode is electrically isolated via a gap portion as at least two or more electrodes that sequentially surround the outer periphery of the center electrode in layers.
8. An atomizing unit comprising the atomizing vibrator according to any one of claims 1, 3,5 or 6 and a driving unit for driving the atomizing vibrator,
the drive unit includes a switch unit that controls the opening and closing of the peripheral electrode, and a control unit that switches the open and closed states of the switch unit based on an output signal of a liquid level detection unit that detects the liquid level of the liquid storage tank.
9. An atomizing unit comprising the atomizing vibrator according to any one of claims 2,4 or 7 and a driving unit for driving the atomizing vibrator,
the drive unit includes a switch unit that is provided in correspondence with each of the plurality of outer peripheral electrodes and controls the on/off of the power supply to the corresponding outer peripheral electrode, and a control unit that switches the on/off state of the switch unit based on an output signal of a liquid level detection unit that detects the liquid level of the liquid storage tank.
10. An atomizing device comprising the atomizing unit according to claim 8, a reservoir for storing a liquid for atomization, and a liquid level detecting section for detecting a liquid level in the reservoir,
the vibrator for atomization is arranged at the bottom of the liquid storage tank,
the control unit switches the switch unit from a closed state (ON) to an open state (OFF) when the liquid level of the liquid reservoir tank falls to a predetermined value based ON an output signal of the liquid level detection unit.
11. An atomizing device comprising the atomizing unit according to claim 9, a reservoir for storing a liquid for atomization, and a liquid level detecting section for detecting a liquid level in the reservoir,
the vibrator for atomization is arranged at the bottom of the liquid storage tank,
the control unit gradually increases the outer peripheral electrode, which switches the switch unit from a closed state (ON) to an open state (OFF), toward a central portion as the liquid level of the liquid reservoir tank decreases, based ON an output signal of the liquid level detection unit.
12. A method of driving an atomizer comprising the vibrator for atomization according to any one of claims 1, 3,5, or 6 provided at the bottom of a reservoir for storing an atomizing liquid,
and stopping the energization of the peripheral electrode when the liquid level of the liquid storage tank drops to a specified value.
13. A method of driving an atomizer comprising the vibrator for atomization according to any one of claims 2,4, or 7 provided at the bottom of a reservoir for storing an atomizing liquid,
the peripheral electrode, which is not energized, is gradually increased toward the center portion as the liquid level of the liquid storage tank is lowered.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-190122 | 2017-09-29 | ||
| JP2017190122 | 2017-09-29 | ||
| PCT/JP2018/035628 WO2019065711A1 (en) | 2017-09-29 | 2018-09-26 | Atomizing oscillatory element, atomizing unit, atomizing device, and drive method for atomizing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111163869A true CN111163869A (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880061606.2A Pending CN111163869A (en) | 2017-09-29 | 2018-09-26 | Vibrator for atomization, atomization unit, atomization device, and method for driving atomization device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP7232767B2 (en) |
| KR (1) | KR20200062200A (en) |
| CN (1) | CN111163869A (en) |
| WO (1) | WO2019065711A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11674700B2 (en) * | 2020-05-06 | 2023-06-13 | Ademco Inc. | Humidifier cartridge with handle |
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|---|---|---|---|---|
| JPS5751666U (en) * | 1980-09-04 | 1982-03-25 | ||
| JPS6033139U (en) * | 1983-08-10 | 1985-03-06 | 三洋電機株式会社 | ultrasonic humidifier |
| JPS618472U (en) * | 1984-06-21 | 1986-01-18 | ティーディーケイ株式会社 | Vibrator holding structure |
| JPS63130160A (en) * | 1986-11-14 | 1988-06-02 | キブツ・ネツツアー・セレニ | Device for atomizing liquid |
| CN1399947A (en) * | 2001-07-26 | 2003-03-05 | 松下电工株式会社 | Ultrasonic beautifying device |
| JP2011110453A (en) * | 2009-11-24 | 2011-06-09 | Touki Co Ltd | Atomizer for forming film |
| JP2016211768A (en) * | 2015-05-01 | 2016-12-15 | 株式会社静岡産業社 | Fog generating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6316076A (en) * | 1986-07-07 | 1988-01-23 | 沖電気工業株式会社 | Electrode fixture for ultrasonic piezoelectric vibrator |
| JPH05208151A (en) | 1992-01-30 | 1993-08-20 | S N D:Kk | Mist generator |
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2018
- 2018-09-26 KR KR1020207008429A patent/KR20200062200A/en unknown
- 2018-09-26 CN CN201880061606.2A patent/CN111163869A/en active Pending
- 2018-09-26 WO PCT/JP2018/035628 patent/WO2019065711A1/en active Application Filing
- 2018-09-26 JP JP2019545554A patent/JP7232767B2/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5751666U (en) * | 1980-09-04 | 1982-03-25 | ||
| JPS6033139U (en) * | 1983-08-10 | 1985-03-06 | 三洋電機株式会社 | ultrasonic humidifier |
| JPS618472U (en) * | 1984-06-21 | 1986-01-18 | ティーディーケイ株式会社 | Vibrator holding structure |
| JPS63130160A (en) * | 1986-11-14 | 1988-06-02 | キブツ・ネツツアー・セレニ | Device for atomizing liquid |
| CN1399947A (en) * | 2001-07-26 | 2003-03-05 | 松下电工株式会社 | Ultrasonic beautifying device |
| JP2011110453A (en) * | 2009-11-24 | 2011-06-09 | Touki Co Ltd | Atomizer for forming film |
| JP2016211768A (en) * | 2015-05-01 | 2016-12-15 | 株式会社静岡産業社 | Fog generating device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2019065711A1 (en) | 2020-11-05 |
| JP7232767B2 (en) | 2023-03-03 |
| WO2019065711A1 (en) | 2019-04-04 |
| KR20200062200A (en) | 2020-06-03 |
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