WO2012063374A1 - 霧化デバイス - Google Patents
霧化デバイス Download PDFInfo
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- WO2012063374A1 WO2012063374A1 PCT/JP2011/000327 JP2011000327W WO2012063374A1 WO 2012063374 A1 WO2012063374 A1 WO 2012063374A1 JP 2011000327 W JP2011000327 W JP 2011000327W WO 2012063374 A1 WO2012063374 A1 WO 2012063374A1
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- WIPO (PCT)
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- substrate
- liquid
- surface acoustic
- acoustic wave
- retaining material
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Classifications
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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
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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
- B05B17/0676—Feeding means
- B05B17/0684—Wicks or the like
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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
Definitions
- the present invention relates to an atomization device that atomizes a liquid using surface acoustic waves.
- Patent Document 1 Japanese Patent Laid-Open No. 2008-104974
- Patent Document 2 Japanese Patent Laid-Open No. 7-116574
- Japanese Patent Laid-Open No. 7-116574 describes an ultrasonic atomizer that atomizes a liquid supplied to a diaphragm through a hole provided in the diaphragm.
- JP 2008-104974 A Japanese Patent Laid-Open No. 7-116574
- the atomization apparatus of Patent Document 1 has a problem that the base and the water retaining material are separated from each other, and the amount of mist atomized from the base is small.
- the base body since it is necessary to provide a minute gap to supply the liquid in a film form, parts and work that require precise accuracy are required, and the liquid can be supplied stably depending on the orientation of the atomizing surface. There is also a problem that it cannot be done.
- the base body generates heat due to the vibration energy of the base body, which may cause malfunction in the surface acoustic wave generator.
- the apparatus of patent document 2 is atomized through the hole provided in the diaphragm, the process of the hole was required and there existed a possibility of a cost increase.
- the present invention has been made to solve such a conventional problem, and an object thereof is to provide an atomization device having a simple structure capable of atomizing a large amount and uniform mist. Another object of the present invention is to provide an atomization device that suppresses heat generation due to loss of energy generated by surface acoustic waves. Furthermore, the other object of this invention is to provide the atomization device which can atomize the mist which has the component which has a specific function.
- the atomizing device of the present invention comprises a base made of a piezoelectric material, A water retaining material that directly contacts the substrate and supplies a liquid to the surface of the substrate; A surface acoustic wave generator provided on the surface of the substrate; A liquid storage unit connected to the water retention material and supplying a liquid to the water retention material.
- the substrate is cut obliquely with respect to a direction orthogonal to the traveling direction of the surface acoustic wave.
- the base is provided with a heat radiating plate.
- the substrate is provided with a rotation mechanism, and the substrate is rotated around the water retaining material by the control of the rotation control means.
- the water retaining material that has absorbed the liquid is disposed in direct contact with the surface of the substrate, so that the liquid can be atomized in a large amount and uniformly and sprayed as a fine mist. Further, since the liquid can be held in the water retaining material, it can be arranged in the up, down, and sideways directions regardless of the orientation of the substrate.
- a base made of a piezoelectric material, a surface acoustic wave generator provided on the surface of the base, a water retaining material for supplying a liquid to the surface of the base, and a water retaining material are connected.
- the atomizing device is configured by the liquid storage unit, and the liquid supplied from the water retaining material is atomized by the surface acoustic wave generated on the surface of the substrate by the surface acoustic wave generating unit.
- the liquid to be atomized includes various liquids depending on the purpose, and is not particularly limited. Examples thereof include distilled water and a solution containing functional components described later in advance.
- the base is a vibration plate that transmits vibrations from the piezoelectric material on which the comb-shaped electrodes are formed and atomizes the liquid contained in the water retaining material that is in direct contact with the substrate, such as a rectangular piezoelectric ceramic with a flat surface.
- a rectangular plate is used as the shape of the base body, but the front end portion in the traveling direction of the surface acoustic wave may be cut obliquely. By cutting the tip part diagonally, when the surface acoustic wave that has traveled is reflected by the tip part, the surface acoustic wave travels within the substrate without returning the direction of the surface acoustic wave to the original direction.
- the attenuation of the surface acoustic wave can be suppressed.
- a difference can be formed in the time required for surface acoustic waves propagating in the same direction to reach the tip portion, and the surface acoustic waves at the tip portion of the substrate are reflected. Heat generation due to energy loss or the like generated at the time can be suppressed.
- the material of the piezoelectric material forming the substrate is not particularly limited.
- Various known materials such as can be applied.
- the substrate absorbs vibration energy and becomes high temperature, it has a heat dissipation property, a material that is slippery with respect to the water retaining material (a material that does not wear the water retaining material), a material that is corrosion resistant to liquid, etc. It is also preferred that the surface is coated. As what satisfies such a requirement, for example, DLC (diamond-like carbon) coating can be mentioned.
- a lyophilic treatment is performed on a portion of the surface of the substrate to which a liquid is supplied from the water retention material.
- the liquid supplied by the water retention material can be made thinner and more easily adapted to the surface of the substrate, and more stable atomization can be performed.
- a known lyophilic coating such as Teflon (registered trademark) resin-based coating or glass fiber (coating) -based coating can be applied.
- the heat sink is provided in the lower part of the base. This is because heat generated from the substrate is dissipated to eliminate the malfunction of the surface acoustic wave generator.
- a metal plate such as an aluminum plate.
- the surface acoustic wave generating unit is a member that is provided on the surface of the substrate made of a piezoelectric material and generates surface acoustic waves that propagate through the surface of the substrate. Examples thereof include comb-shaped electrodes formed by screen printing and the like. Connected to power. Further, other known SAW elements (Surface Acoustic Wave elements) may be applied as long as they have a function of vibrating a water retaining material described later.
- the water retention material is a member composed of a porous material having water absorption and water retention properties.
- a porous material or a fiber molded body for example, a glass material
- a ceramic material such as a ceramic material, a synthetic resin material, or a metal material
- the amount of liquid supply can be changed by changing the material and the cross-sectional area, thereby controlling the amount of atomization.
- the water retaining material is brought into contact with a surface, a line, or a point can be considered as a mode of direct contact with the surface of the substrate, it can be directly contacted with the substrate in a linear manner from the experimental results described later. A large amount of mist can be atomized, which is preferable.
- the water retaining material has a role of directly contacting the surface of the substrate and atomizing the liquid held by the vibration of the surface acoustic wave of the substrate, and can withstand contact wear with the vibrating substrate. preferable.
- the water retaining material can be arranged with an angle ⁇ (for example, about 10 to 30 °) without being orthogonal to the traveling direction of the surface acoustic wave.
- ⁇ for example, about 10 to 30 °
- a difference can be provided in the time for the surface acoustic wave to reach the water retention material, and a time difference can be created in the timing of atomization from the water retention material. . That is, the liquid in the part of the water retaining material that the surface acoustic wave has reached earlier is atomized first, and the part in which the surface acoustic wave has arrived later is atomized later. Since it atomizes, fine mist can be generated.
- the ceramic material of the porous body or fiber molded body constituting the water retention material is a single oxide such as silica, alumina, magnesia, titania, zirconia, or mullite, zeolite, bentonite, ceviolite, attapulgite, sillimanite, kaolin, Sericite, diatomaceous earth, feldspar, square mesh viscosity, silicate compounds (perlite, vanamicurite, sericite, etc.)
- natural fiber materials include pulp fibers, cotton, wool fibers, and hemp fibers.
- synthetic resin materials include polyester, nylon, rayon, urethane (including polyurethane), acrylic, and polypropylene, and metal materials. Examples include stainless steel, copper, titanium, tin, platinum, gold, and silver. Moreover, carbon fiber etc. are used suitably.
- a honeycomb structure and a corrugated structure are exemplified, and a pipe shape, a sheet shape, a pleat shape, and the like are also exemplified.
- the necessary condition as a water retention material is that it has excellent water absorption and water retention.
- various non-longitudinal cross-sectional shapes such as a circle, a semicircle, a quadrangle, and a triangle can be considered, and there is no particular limitation.
- the water-retaining material having these shapes is in direct contact with the substrate in a linear form, so that the mist from the water-retaining material can be more atomized and uniform.
- a plurality of water retaining materials can be arranged in parallel on the surface of the substrate.
- the amount of atomization can be increased by arranging two in a line in the traveling direction of the surface acoustic wave.
- the water retaining material may be impregnated with a functional component that can be dissolved in water or a functional component that can be dispersed in a colloidal form.
- the liquid storage unit described later may contain these functional components in advance. Since it is not necessary to include a sex component, the functional component can be atomized by supplying only moisture.
- the component include platinum nanoparticles.
- “functionality” means a property that makes the living environment comfortable and can improve health, deodorization (deodorization, decomposition, etc.), antimicrobial (antibacterial, bactericidal, bacteriostatic, antifungal) , Antiviral, etc.), relaxation (aromatherapy), moisturizing, antioxidant, harmful organism repellent, antistatic, dustproof, etc. .
- the liquid storage unit is configured by a storage container that stores the liquid to be atomized and always supplies the liquid directly or indirectly to the water retaining material by using a capillary phenomenon or the like.
- you may attach a liquid quantity sensor to the bottom part in a storage container.
- the liquid amount sensor can generate a signal when the liquid in the storage container is exhausted to prompt the replenishment of the liquid.
- the liquid storage part and the water retaining material may be directly connected, or may be indirectly connected via an infusion member.
- the infusion part is made of a material that can absorb and infuse liquid by capillary action as in the case of the water retaining material and the liquid storage part. And like a water retention material, you may comprise with components consisting of a fiber, resin, ceramics, etc., and the supply amount of a liquid can be changed by changing the material and cross-sectional area.
- the functional component that can be dissolved in water or the functional component that can be dispersed in a colloidal form may be impregnated in advance in the infusion part or the liquid storage part. As a result, the functional component can be sprayed at a high concentration or over a relatively long period of time.
- the atomizing device of the example is provided with a comb-shaped electrode 2 as surface acoustic wave generating means on the surface of a base 1 made of a piezoelectric material of LiNbO 3 .
- the comb-shaped electrode 2 is connected to a high-frequency power source 21, and when an operator operates an input means (not shown), a current flows from the high-frequency power source 21 to the comb-shaped electrode 2 to generate a predetermined voltage between the comb-shaped electrodes.
- the substrate 1 is minutely vibrated.
- the tip 101 of the substrate 1 is cut into an oblique shape at an angle ⁇ .
- a water retaining material 3 made of porous fibers is disposed at the tip of the surface acoustic wave traveling direction from the comb-shaped electrode 2 so as to be in direct contact with the surface of the substrate 1.
- One end in the longitudinal direction of the water retaining material 3 having a circular cross-section is connected to an infusion member 4 made of a water-permeable ceramic material, and indirectly supplies liquid from the liquid reservoir 5 via the infusion member 4. Have come to receive. Further, the liquid is stored in the liquid storage unit 5, and the liquid is always supplied to the water retaining material 3 due to a capillary phenomenon or the like.
- a lyophilic region 7 is formed on the surface of the substrate 1 in a predetermined range with a region where the water retaining material 3 is in contact as a center. Teflon (registered trademark) is coated as a lyophilic treatment for forming the lyophilic region 7.
- FIG. 2 the cross-sectional example of the non-longitudinal direction of the water retention material 3 is shown.
- FIG. 1 shows the case where the water retaining material 3 having a circular cross section is used, as shown in FIG. 2, the cross sectional shapes are (a) round, (b) oval, (c) half Examples include a circle, (d) an inverted triangle, (e) a diamond shape, and (f) a quadrangle.
- the semicircular shape of (c) is preferably such that the arc side is in direct contact with the substrate 1, and the inverted triangle shape of (d) is such that one corner is in contact with the substrate 1 with the triangle reversed in cross-sectional shape. It is preferable to arrange them as follows.
- the water retaining material 3 is arranged so as to be in line contact rather than surface contact as a mode of directly contacting the base body 1. That is, (a) a round shape, (b) an elliptical shape, (c) a semicircular shape, (d) an inverted triangle shape, and (e) a diamond shape, in such a manner that the contacting portion is in line contact with the substrate 1. It is preferable to arrange.
- FIG. 3 shows a first modification of the embodiment.
- the second water retention material 6 is arranged in parallel with the water retention material 3 in the traveling direction of the surface acoustic wave in a mode in which the second water retention material 6 is in direct contact with the base 1.
- the liquid storage part 5 is connected via the infusion member 4.
- the atomization device of the first modification can generate a larger amount of mist because the liquid is atomized by a plurality of water retaining materials.
- FIG. 4 shows a second modification of the embodiment.
- the water retaining material 3 is disposed so as to contact the tip of the base body 1.
- the tip portion is the portion that is most susceptible to vibration energy of the substrate 1 and can be atomized from the water retaining material 3 uniformly and in a large amount.
- FIG. 5 shows a third modification of the embodiment.
- a rotation mechanism 8 is provided on the base body 1 and the base body 1 is rotated around the water retaining material under the control of a rotation control means 9 such as a PC.
- a rotation control means 9 such as a PC.
- the rotation control means 9 can be omitted.
- the infusion member 4 when the infusion member 4 is interposed, the infusion member 4 can be configured to be extendable and contractable so as to follow the rotation of the base body 1.
- FIG. 6A shows a base body whose front end portion is not cut obliquely
- FIG. 6B shows a base body whose front end portion is cut obliquely.
- (a) when the front-end
- Such a surface acoustic wave reversal phenomenon causes resonance of the substrate 1 and causes problems such as coarsening of the atomized mist or generation of heat of the substrate 1.
- the elasticity has progressed in the traveling direction 22.
- the surface wave After the surface wave reaches the tip portion 101 of the substrate 1, it reflects in the traveling direction 24 different from the backward traveling direction 22b, and the reflected surface acoustic wave in the traveling direction 24 is further reflected by another edge of the substrate 1, Proceed in the direction of travel 25.
- the tip portion 101 of the substrate 1 obliquely at an angle ⁇ , the surface acoustic wave can be dispersed in various traveling directions, and the atomized mist is made uniform, resonance of the substrate 1 or the like. Heat generation can be suppressed.
- the angle ⁇ is not required to reflect the traveling direction of the surface acoustic wave reflected at the tip 101 in the reverse traveling direction 22b, and therefore the angle ⁇ may be greater than 0 degrees and less than 90 degrees, which will be described later. From the experimental results, 5 to 60 degrees is preferably adopted.
- FIG. 7 shows a heat generation evaluation result of the base body obtained by obliquely cutting the tip portion 101 of the base body 1.
- a base when the tip 101 is obliquely cut (a), a rectangular shape (b), and two kinds of bases 1 are mounted on an aluminum plate as a heat sink 11 and an applied voltage of 50 Vp-p is applied.
- the surface temperature of 1 was measured by thermography.
- the substrate 1 (a) cut obliquely at an angle ⁇ showed an effect of suppressing heat generation, while the rectangular shape (b) generated heat. Specific numerical values are shown in Table 1 described later.
- FIG. 8 shows a fourth modification of the embodiment.
- the water retaining material 3 is disposed on the base at an angle ⁇ .
- the angle ⁇ is an angle formed with the line 102 orthogonal to the traveling direction 22 of the surface acoustic wave.
- Table 1 shows the amount of mist generated from the atomizing device and the heat generation of the substrate 1 when the oblique cut angle ⁇ of the substrate 1 shown in FIG. The experimental result which evaluated temperature is shown.
- the applied voltage was 50 Vp-p.
- the amount of mist is a numerical value in units of ml / h, and the amount of decrease from the liquid storage unit 5 was measured.
- the heat generation was measured by thermography of the surface temperature of the substrate 1.
- the types of water-retaining materials are three types of cross-sectional shapes: round (as shown in FIG. 2 (a)), square (as shown in FIG. 2 (f)), and inverted triangle (as shown in FIG. 2 (d)).
- Triangular objects were inverted triangles in cross-sectional shape and arranged so that one corner thereof was in contact with the substrate 1. Therefore, the triangular ridge line is in contact with the base 1. From the results of Table 1 (a), the water retaining material having a round cross-section and an inverted triangle has a large amount of mist and a low exothermic temperature at any oblique angle ⁇ .
- the cross-sectional shape is a square
- the amount of mist is small and not practical.
- the substrate 1 and the water retention material 3 which are arranged apart from each other have a small amount of mist and are not practical regardless of the water retention material having any cross-sectional shape.
- FIG. 9 is a diagram for explaining a mode in which the atomizing device according to the embodiment is attached to the heat sink 11 made of aluminum. As shown in FIG. 9, a part of both sides of the heat radiating plate 11 is notched inward, the notched plate part is bent inward, and the caulking 12 The substrate 1 can be attached to the heat sink 11.
- Drawing 10 is a figure explaining other modes which attach the atomization device of an embodiment to a heat sink. As shown in FIG. 10, a part of both sides of the heat radiating plate 11 is notched inward, and the notched plate portions are bent inward to form fixing protrusions 13 provided on both sides of the base 1.
- the substrate 1 can be attached to the heat radiating plate 11 so as to stop.
- the comb electrodes provided on the base body are illustrated as being exposed, but may actually be covered with a cover.
- the atomizing device of the present invention uses a water-retaining material capable of absorbing a liquid to absorb the liquid and arrange it in direct contact with the surface of the substrate so that the liquid is atomized in a large amount and uniformly. Thus, it can be sprayed as a fine mist, and can be applied to industrial equipment such as a mist generator, an air purifier, and an air conditioner.
- the atomization device can be arranged in the up, down, and sideways directions regardless of the orientation of the substrate, and the industrial applicability is extremely high.
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Abstract
Description
例えば、特許文献1(特開2008-104974公報)には、表面弾性波の伝搬面に微細な隙間を有する保水材(膜形成部材)を設け、この隙間に液体を供給することで霧化させることが記載されている。
また、特許文献2(特開平7-116574公報)には、振動板に供給された液体を振動板に設けられている穴を通して霧化される超音波霧化装置が記載されている。
さらに、基体の振動エネルギーによって基体が発熱し表面弾性波発生部に誤動作を生ぜしめるおそれがあった。
また、特許文献2の装置は、振動板に設けられている穴を通して霧化されるので、穴の加工が必要であり、コスト増加のおそれがあった。
また、本発明の他の目的は、表面弾性波により発生したエネルギーの損失等により発熱を抑制した霧化デバイスを提供することである。
さらに、本発明の他の目的は、特定の機能を有する成分を有したミストを霧化させることができる霧化デバイスを提供することである。
前記基体に直に接触して該基体の表面に液体を供給する保水材と、
前記基体の表面に設けられた表面弾性波発生部と、
前記保水材に接続し保水材に液体を供給する液体貯蔵部と、を具備することを特徴とする。
(2)上記(1)の霧化デバイスにおいて、前記基体は、弾性表面波の進行方向と直交する方向に対し、斜めに切断したものであることを特徴とする。
(3)上記(1)又は(2)に記載の霧化デバイスにおいて、前記基体には放熱板が設けられていることを特徴とする。
(4)また、上記(1)乃至(3)のいずれかの霧化デバイスにおいて、
基体に回動機構を設け、回動制御手段による制御により、基体を保水材廻りに回動させるようにしたことを特徴とする。
また、液体を保水材に保持させておくことができるため、基体の向きのよらず、上、下、横向きに配置することができる。
霧化される液体としては目的により種々のものが挙げられ、特に制限はない。例えば蒸留水や、後述する機能性成分が予め含有された溶液などが挙げられる。
また、基体の形状は矩形板が用いられるが、表面弾性波の進行方向の先端部が斜めに切断されていてもよい。
先端部を斜めに切断することによって、進行してきた弾性表面波がその先端部で反射する際に、弾性表面波の進行方向を元の方向にもどさせることなく基体内での弾性表面波の進行方向をあらゆる方向に分散させることにより、弾性表面波の減衰を抑制できる。
また、先端部を斜めに切断した形状とすることにより、同一方向に伝播する表面弾性波が先端部に到達する時間に差を形成させることができ、基体の先端部における表面弾性波が反射する際に発生するエネルギー損失等による発熱を抑制することができる。
親液処理によって、保水材により供給した液体を基体の表面でより薄く馴染みやすくさせることができ、より安定した霧化を行うことができる。
親液処理としては、テフロン(登録商標)樹脂系コーティングや、ガラス繊維(被膜)系コーティングなど公知の親液コーティングを適用することができる。
また、後述の保水材を振動させる機能を備えたものであれば、他の公知のSAW素子(Surface Acoustic Wave素子)の構成を適用してもよい。
また、その材質や断面積を変えることで液体の供給量を変えることができ、これにより霧化量をコントロールすることもできる。
進行方向に対して直交させずに角度αに配置することにより、表面弾性波が保水材に到達する時間に差を設けることができ、保水材からの霧化のタイミングに時間差を作ることができる。
すなわち、表面弾性波が早く到達した保水材の部分の液体を先に霧化させ、表面弾性波が遅く到達した部分は遅く霧化させるため、保水材に貯留されている液体を長手方向において順に霧化するので、微細なミストを発生させることができる。
天然繊維材料としては、パルプ繊維、綿、ウール繊維、麻繊維などが挙げられ、合成樹脂材料としては、ポリエステル、ナイロンやレーヨン、ウレタン(ポリウレタンを含む)、アクリル、ポリプロピレンなどが挙げられ、金属材料としては、ステンレス、銅、チタン、スズ、プラチナ、金、銀などが挙げられる。また、炭素繊維なども好適に用いられる。
保水材としての必要条件は優れた吸水力および保水力を有するということである。
なお、保水材の形状は、その非長手方向の断面形状が円形、半円形、四角形、三角形などの多種のものが考えられ、特に制限はない。
なお、これらの形状の保水材を、基体と線状で直に接触させることによって、保水材からのミストの霧化がより多くしかも均一化できて好ましい。
後述する液体貯蔵部に予めこれら機能性成分を含有させてもよいのであるが、保水材に予め含浸させた機能性成分を含むミストとして霧化することができることに加え、供給する液体には機能性成分を含ませる必要がないため水分だけを供給することで、機能性成分を霧化することができる。
なお収容容器内の底部に、液量センサを付設してもよい。これにより、例えば液量センサは収容容器内の液体が無くなると信号を発生して液体の補充を促すようにすることができる。
なお、液体貯蔵部と保水材は直接接続されていてもよいし、輸液部材を介して間接的に接続されていてもよい。
そして、保水材と同様に、繊維、樹脂、セラミックス等からなる部品で構成してもよく、その材質や断面積を変えることで液の供給量を変えることができる。
なお、輸液部や液体貯蔵部の内部にも上述した水に溶解することのできる機能性成分やコロイド状に分散できる機能性成分を予め含浸させておいてもよい。これにより機能性成分を高濃度に、あるいは比較的長期間にわたって機能性成分を散布することができる。
図1に示すように、実施例の霧化デバイスは、LiNbO3の圧電材料からなる基体1の表面には表面弾性波発生手段としての櫛形電極2が設けられている。
櫛形電極2は高周波電源21に接続されており、操作者が図示しない入力手段を操作することにより、高周波電源21から櫛形電極2に電流が流れて櫛形電極間に所定の電圧を生ぜしめ、これにより基体1を微小振動させる。
なお、基体1の先端部101は、角度θで斜め形状に切断されている。
断面円形状の保水材3長手方向の一方の端部は、通水性のあるセラミックス材料で構成された輸液部材4と接続され、輸液部材4を介して間接的に液体貯蔵部5から液体の供給を受けるようになっている。
また、液体貯蔵部5には液体が貯蔵されており、毛細血管現象などにより、常時、保水材3へ液体が供給されるようになっている。
このように、基体1の表面のうち保水材3が直に接触する周辺が親液処理されているため、保水材3から供給された液体を基体表面に薄く広げることができ、基体1を振動させて液体を均一に霧化させることができる。
なお、保水材3に界面活性剤を含ませるなどして親液性を持たせることでも同様の効果を得ることができる。
図1では断面形状が円形の保水材3を用いた場合を示しているが、図2に示すように、その断面形状としては、(a)丸形、(b)楕円形、(c)半円形、(d)逆三角形、(e)ダイヤモンド形、(f)四角形などが挙げられる。
(c)の半円形は円弧側が基体1と直に接触させていることが好ましく、(d)の逆三角形のものは断面形状において三角形を逆にしてその1つの角が基体1に接触するようにして配置することが好ましい。
なお、後述するが、多量のミストを発生させる観点や基体1の発熱を抑制するという観点から、保水材3を基体1と直に接触する態様として、面接触よりも線接触させるように配置すること、すなわち、(a)丸形、(b)楕円形、(c)半円形、(d)逆三角形、(e)ダイヤモンド形において、その接触する部分が基体1と線接触するような態様で配置することが好ましい。
第一変形例の霧化デバイスは、複数本の保水材で液体を霧化させるためより多量のミストを発生させることができる。
これにより、保水材3を基体1の上側に配置した場合(a)、保水材3を基体1の横側に配置した場合(b)、保水材3を基体1の下側に配置した場合(c)、など、保水材3と基体1との配置関係を多様な姿勢にすることができ、ミストの噴霧方向を自由に設定することができる。
さらには、ミストの噴霧方向を途中で様々な方向に切り換えたい場合などにも適切に対応することができる。
なお、手動にて回動機構8を操作する場合は回動制御手段9は省略することもできる。
また、輸液部材4が介在する場合には当該輸液部材4を伸縮可能な構造とし、基体1の回動に追随させることもできる。
図6(a)は先端部を斜めに切断していない基体であり、(b)は先端部を斜めに切断した基体である。
(a)に示すように、弾性表面波の進行方向22に対し、基体1の先端部101が直交する場合は、表面弾性波発生部2から送出された弾性表面波の進行方向22は基体1の先端部101まで伝搬した後、先端部101で反射してその方向を180度転換させられ、逆進行方向22bに伝搬を続ける。
このような弾性表面波の逆戻り現象は基体1の共振を招き、霧化されるミストの大きさを粗くしたり基体1の発熱を生ぜしめたりなどの問題点がある。
これに対し、(b)に示すように、
基体1の先端部101を、弾性表面波の進行方向22と直交する方向23に対し、斜め(弾性表面波発生部方向に角度θ)に切断した基体においては、進行方向22に進行してきた弾性表面波は、基体1の先端部101に到達した後、逆進行方向22bとは異なる進行方向24に反射し、進行方向24の反射弾性表面波はさらに基体1の他のエッジで反射した後、進行方向25に進む。
このように、基体1の先端部101を角度θで斜めに切断することで、表面弾性波を様々な進行方向に分散させることができ、霧化するミストの均一化や基体1の共振等による発熱を抑えることができる。
なお、角度θは、先端部101で反射する弾性表面波の進行方向を、逆進行方向22bに反射させなければよいので、角度θは0度を超え90度未満であればよいが、後述する実験結果から、5度~60度が好ましく採用される。
先端部101を斜めに切断したもの(a)と矩形状のもの(b)と、2種類の基体1を放熱板11であるアルミ板上に取り付け、印加電圧50Vp-pを負荷したときの基体1の表面温度をサーモグラフィにより測定した。
その結果、角度θに斜めに切断した基体1(a)は発熱抑制効果がみられたが、矩形状のもの(b)は発熱があった。具体的な数値は後述する表1に示す。
図8に示す第四変形例は、保水材3を角度αで斜めに基体上に配置している。
角度αは表面弾性波の進行方向22に対して直交する線102とのなす角度である。
この場合は、表面弾性波が早く到達した保水材3に貯留されている液体から霧化が進行し、表面弾性波の到達が遅い保水材3に貯留されている液体は遅く霧化させられるため、霧化のタイミングに時間差を作ることができ、基体1における発熱を抑えることができる。
表1の(a)は保水材を基体1と直に接触させて(面距離=0と表記している)実験を行った場合であり、
表1の(b)は保水材を基体1に直に接触させずに、0.5mm離間させて配置して(面距離=0.5と表記している)実験を行った場合である。
なお、表中、ミスト量は、ml/h単位の数値であり、液体貯蔵部5からの減少量を測定した。また、発熱は、基体1の表面温度をサーモグラフィにより測定した。
さらに、保水材の種類は、その断面形状が、丸形(図2(a)のもの)、四角形(図2(f)のもの)、逆三角形(図2(d)のもの)の3種類を用いた。
三角形のものは、断面形状において逆三角形にしてその1つの角が基体1に接触するようにして配置した。したがって三角の稜線が基体1と接触している態様になっている。
表1(a)の結果より、保水材の断面形状が丸形、逆三角形のものがいずれの斜め角度θでもミスト量が多く、発熱温度も低い。ただし、断面形状が四角形のものはミスト量が少なく実用的ではなかった。
また、表1(b)の結果より、基体1と保水材3を離間させて配置しているものは、いずれの断面形状の保水材であってもミスト量が少なく実用的ではなかった。
図9に示すように、放熱板11の両サイドの一部を内方に切り欠き、その切り欠いた板部分を内方に折り曲げて、基体1の両サイドを抱きかかえるようにしてカシメ12、基体1を放熱板11に取り付けることができる。
図10は、実施形態の霧化デバイスを放熱板に取り付ける他の態様を説明する図である。
図10に示すように、放熱板11の両サイドの一部を内方に切り欠き、その切り欠いた板部分を内方に折り曲げて、基体1の両サイドに設けられた固定用突起13に止めるようにして、基体1を放熱板11に取り付けることができる。
なお、図9,10では、基体に設けられている櫛形電極が露出して記載されているが、実際にはカバーで覆われていてもよい。
また、基体の向きのよらず、上、下、横向きに霧化デバイスを配置することができ、産業上の利用可能性が極めて高い。
2 櫛形電極(表面弾性波発生部)
3 保水材
4 輸液部材
5 液体貯蔵部
6 第二の保水材
7 親液領域
8 回動機構
9 回動制御手段
11 放熱板
12 カシメ
13 固定用突起
21 高周波電源
22 進行方向
22b 逆進行方向
23 弾性表面波の進行方向22と直交する方向
24 進行方向
25 進行方向
101 基体の先端部
102 表面弾性波の進行方向22に対して直交する線
α 表面弾性波の進行方向22に対して直交する線102とのなす角度
θ 弾性表面波の進行方向22と直交する方向23に対し、斜めに切断した基体先端部のなす角度
Claims (4)
- 圧電材料からなる基体と、
前記基体に直に接触して該基体の表面に液体を供給する保水材と、
前記基体の表面に設けられた表面弾性波発生部と、
前記保水材に接続し保水材に液体を供給する液体貯蔵部と、を具備することを特徴とする霧化デバイス。 - 前記基体は、弾性表面波の進行方向と直交する方向に対し、斜めに切断したものであることを特徴とする請求項1に記載の霧化デバイス。
- 前記基体には放熱板が設けられていることを特徴とする請求項1又は2に記載の霧化デバイス。
- 前記基体に回動機構を設け、回動制御手段による制御により、基体を保水材廻りに回動させるようにしたことを特徴とする請求項1乃至3のいずれかに記載の霧化デバイス。
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EP2961454A4 (en) * | 2013-03-01 | 2016-11-23 | Univ Rmit | ATOMIZATION APPARATUS USING SURFACE ACOUSTIC WAVE GENERATION |
WO2021070501A1 (ja) * | 2019-10-08 | 2021-04-15 | 日本たばこ産業株式会社 | Sawモジュール、香味吸引器具およびsawモジュールの製造方法 |
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JP2015016407A (ja) * | 2013-07-10 | 2015-01-29 | 株式会社コバテクノロジー | Sawを用いた霧化装置 |
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CA2985216C (en) * | 2015-05-13 | 2023-05-09 | Royal Melbourne Institute Of Technology | Acoustic wave microfluidic devices with increased acoustic wave energy utilisation |
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JP6855502B2 (ja) * | 2016-03-30 | 2021-04-07 | フィリップ・モーリス・プロダクツ・ソシエテ・アノニム | エアロゾル発生のための喫煙装置および方法 |
US11717845B2 (en) | 2016-03-30 | 2023-08-08 | Altria Client Services Llc | Vaping device and method for aerosol-generation |
CN118080245A (zh) * | 2018-04-05 | 2024-05-28 | 皇家墨尔本理工大学 | 雾化器和液体雾化方法 |
JP7336663B2 (ja) * | 2019-07-05 | 2023-09-01 | パナソニックIpマネジメント株式会社 | 液体霧化システム及びミスト発生システム |
WO2021200124A1 (ja) * | 2020-03-31 | 2021-10-07 | パナソニックIpマネジメント株式会社 | 液体霧化システム |
WO2023108316A1 (zh) * | 2021-12-13 | 2023-06-22 | 中国科学院深圳先进技术研究院 | 基于声表面波技术的便携式精准可视化雾化递送设备 |
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