JP6762513B2 - Micro bubble generator - Google Patents
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- JP6762513B2 JP6762513B2 JP2016056276A JP2016056276A JP6762513B2 JP 6762513 B2 JP6762513 B2 JP 6762513B2 JP 2016056276 A JP2016056276 A JP 2016056276A JP 2016056276 A JP2016056276 A JP 2016056276A JP 6762513 B2 JP6762513 B2 JP 6762513B2
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- 239000007788 liquid Substances 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 description 13
- 239000002101 nanobubble Substances 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002872 contrast media Substances 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000004033 diameter control Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Description
本発明は、微小気泡発生板に関し、さらに詳しくは、大がかりな装置を必要とせず、簡易にマイクロバブルやナノバブルなどの微小気泡を発生させることができる微小気泡発生板に関するものである。 The present invention relates to a micro-bubble generating plate, and more particularly to a micro-bubble generating plate capable of easily generating micro-bubbles such as micro-bubbles and nano bubbles without requiring a large-scale device.
近年、マイクロバブルやナノバブルといった微小気泡は、造影剤や摩擦低減効果等種々の効果効用を有し、種々分野に応用できることから注目を集めている。
このため、マイクロバブルやナノバブルの製造方法や製造装置は種々提案されている。
たとえば、特許文献１には、大がかりな装置を用いることなく、簡便にナノバブルを製造できるナノバブル製造装置として、液体を通液する配管と、配管の上流側の分岐部で液体の一部を分岐させて再度配管の下流側の合流部で戻す分岐管と、分岐管の途中に設けられ液体の一部に気体を混合する気液混合部とからなり、液中に４〜１００μmの範囲のマイクロバブルを生成するマイクロバブル製造部と、配管の下流端側に接続されたナノバブル製造部本体と、本体内に設けられた孔付き板と、孔付き板の下流側に孔付き板に近接して設けられた衝突板とからなり、液中に100nm以下の範囲のナノバブルを発生させるナノバブル製造部とからなるナノバブル製造装置であって、合流部と孔付き板までの距離Lが、配管の内径Dに対して5D〜6Dの範囲であるナノバブル製造装置が提案されている。
また、特許文献２には、液体中で表面から微小気泡を発生させる気泡発生面を有する微小気泡発生板であって、上記気泡発生面は平面と該平面に窪みを設けることで形成された複数の谷部とを有してなり、該谷部は、窪みの頂点を形成する底頂部と、窪みの起点を形成する基頂部と、該底頂部及び該基頂部をつなぐ谷面とからなり、上記底頂部を挟んで対向する２つの上記基頂部間の間隔が０．１〜１ｍｍであり、対向する２つの上記谷面部間の角度が１０〜９０°であることを特徴とする微小気泡発生板が提案されている。
In recent years, microbubbles such as microbubbles and nanobubbles have various effects such as a contrast medium and a friction reducing effect, and are attracting attention because they can be applied to various fields.
Therefore, various methods and devices for producing microbubbles and nanobubbles have been proposed.
For example, in Patent Document 1, as a nanobubble manufacturing device capable of easily manufacturing nanobubbles without using a large-scale device, a pipe through which liquid is passed and a part of the liquid are branched at a branch portion on the upstream side of the pipe. It consists of a branch pipe that returns at the confluence on the downstream side of the pipe and a gas-liquid mixing part that is provided in the middle of the branch pipe and mixes gas with a part of the liquid. Microbubbles in the range of 4 to 100 μm in the liquid. The micro-bubble manufacturing unit that generates the water, the main body of the nano-bubble manufacturing unit connected to the downstream end side of the pipe, the perforated plate provided in the main body, and the perforated plate provided close to the perforated plate on the downstream side. It is a nanobubble manufacturing device consisting of a colliding plate and a nanobubble manufacturing unit that generates nanobubbles in the range of 100 nm or less in the liquid, and the distance L between the confluence and the perforated plate is the inner diameter D of the pipe. On the other hand, nanobubble manufacturing equipment in the range of 5D to 6D has been proposed.
Further, Patent Document 2 describes a plurality of microbubble generating plates having a bubble generating surface for generating microbubbles from the surface in a liquid, and the bubble generating surface is formed by providing a flat surface and a depression on the flat surface. The valley is composed of a bottom apex forming the apex of the depression, a base portion forming the starting point of the depression, and a valley surface connecting the bottom top and the base. The generation of microbubbles is characterized in that the distance between the two tops facing each other across the bottom top is 0.1 to 1 mm, and the angle between the two facing valleys is 10 to 90 °. A board has been proposed.
特許文献１に提案さているように従来提案されているバブル発生装置は機械的なせん断力を加えることで気泡粒径を小さくしてマイクロバブル化するものであり、せん断力を加えるための装置が必要で、この装置自体が大掛かりなものとなるという問題があった。
また、特許文献２に提案されている微細気泡発生板は、小さな装置構成で微細気泡の発生が確認されているが、より粒径の小さい微細気泡を安定して発生させることが要望されている。
このため、小さな装置構成で実用的なレベルのマイクロバブルやナノバブルを安定して発生させることが可能で、簡易に微小気泡を発生させることのできる気泡発生装置の開発が要望されている。
As proposed in Patent Document 1, the conventionally proposed bubble generator reduces the particle size of bubbles by applying a mechanical shearing force to form microbubbles, and a device for applying the shearing force is provided. There was a problem that it was necessary and the device itself became large-scale.
Further, in the fine bubble generating plate proposed in Patent Document 2, it has been confirmed that fine bubbles are generated in a small device configuration, but it is required to stably generate fine bubbles having a smaller particle size. ..
Therefore, there is a demand for the development of a bubble generator capable of stably generating practical-level microbubbles and nanobubbles with a small device configuration and easily generating microbubbles.
したがって、本発明の目的は、大がかりな装置を必要とせず、簡易にマイクロバブルやナノバブルなどの微小気泡を安定して発生させることができる微小気泡発生板を提供することにある。 Therefore, an object of the present invention is to provide a microbubble generating plate capable of stably generating microbubbles such as microbubbles and nanobubbles without requiring a large-scale device.
本発明者らは、上記課題を解消すべく鋭意検討した結果、従来壁面上で生成される気泡の大きさは壁面上の微細な孔の大きさに依存することが知られているが、この事実に着目して微細孔を形成するような精密な加工技術を用いなくても微細孔と同様の作用が期待できる表面形態が存在することを知見し、さらにこの知見に基づいて種々検討した結果、特定形状を有する傾斜面を形成することで上記目的を達成しうることを知見し、本発明を完成するに至った。
すなわち、本発明は以下の各発明を提供するものである。
１．液体中で表面から微小気泡を発生させる気泡発生部を有する微小気泡発生板において、
上記気泡発生部は、基面上に１又は複数の凸部を列を形成するように設けることで形成されており、
上記凸部は、該凸部の頂点を形成する頂部と、該凸部の起点を形成する基底部と、該頂部及び該基底部をつなぐ斜部とからなり、
上記基底部における任意の１点と、該１点に対して上記頂部を挟んで対向する対向点との間の間隔が０．１〜１ｍｍであり、
対向する２つの上記斜部間の角度が１５〜７５°であり、
上記斜面に微細な凹凸が設けられていることを特徴とする微小気泡発生板。
２．上記微細な凹凸は、連続して設けられており、高さ０．０５〜０．３ｍｍの階段状の凹凸であることを特徴とする１記載の微小気泡発生板。
As a result of diligent studies to solve the above problems, the present inventors have conventionally known that the size of bubbles generated on a wall surface depends on the size of fine holes on the wall surface. Focusing on the facts, we found that there is a surface morphology that can be expected to have the same effect as micropores without using precise processing technology to form micropores, and as a result of various studies based on this finding. , It was found that the above object can be achieved by forming an inclined surface having a specific shape, and the present invention has been completed.
That is, the present invention provides the following inventions.
1. 1. In a microbubble generating plate having a bubble generating portion that generates microbubbles from the surface in a liquid,
The bubble generating portion is formed by providing one or a plurality of convex portions on the base surface so as to form a row.
The convex portion is composed of a top portion forming the apex of the convex portion, a base portion forming the starting point of the convex portion, and an oblique portion connecting the top portion and the base portion.
The distance between any one point on the base and the opposite point facing the one point across the top is 0.1 to 1 mm.
The angle between the two opposing slopes is 15-75 °.
A micro-bubble generating plate characterized in that the slope is provided with fine irregularities.
2. 2. The fine bubble generating plate according to 1, wherein the fine irregularities are continuously provided and are stepped irregularities having a height of 0.05 to 0.3 mm.
本発明の微小気泡発生板は、大がかりな装置を必要とせず、簡易にマイクロバブルやナノバブルなどの微小気泡を安定して発生させることができるものである。 The micro-bubble generating plate of the present invention does not require a large-scale device, and can easily and stably generate micro-bubbles such as micro-bubbles and nano-bubbles.
１：微小気泡発生板１、１０：気泡発生部１０、２０：平面、３０：谷部、３２：頂部、３４：基底部、３６：谷面 1: Micro bubble generator 1, 10: Bubble generator 10, 20: Plane, 30: Valley, 32: Top, 34: Base, 36: Valley
以下、本発明をさらに詳細に説明する。
＜全体構成＞
本発明の微小気泡発生板１は、図１及び２に示すように、液体中で表面から微小気泡を発生させる気泡発生部１０を有し、気泡発生部１０は、基面２０（図２参照）上に１つの長尺の凸部３０を渦巻き状に設け、凸部３０を、列をなして設けることで形成されており、凸部３０は、凸部３０の頂点を形成する頂部３２と、凸部３０の起点を形成する基底部３４と、頂部３２及び基底部３４をつなぐ斜部３６とからなる。
さらに詳述すると、図１に示す実施形態の微小気泡発生板は、円形の平板体であり、その厚さは用途に応じて任意であるが通常は１〜１５ｍｍである。なお、本実施形態においては２ｍｍである。
微小気泡発生板の形成材料は、特に制限されないが加熱しても変形しない材料であるのが好ましく、鉄、ステンレス、アルミ、銅などの金属が好ましく、シリコン、親水性基を有する樹脂等の親水性の材料も用いることができる。
凸部３０は、図１に示すように、板体の中央部から円盤状の板体の外周縁に向けて複数同心円の凸部３０が連続して配設されている。なお、図1においては周縁部における凸部を省略して示しているが、どの位置まで凸部を設けるかは任意であり、例えば外周縁まで設けることができる。
Hereinafter, the present invention will be described in more detail.
<Overall configuration>
As shown in FIGS. 1 and 2, the microbubble generating plate 1 of the present invention has a bubble generating portion 10 that generates microbubbles from the surface in a liquid, and the bubble generating portion 10 has a base surface 20 (see FIG. 2). ), One long convex portion 30 is provided in a spiral shape, and the convex portions 30 are provided in a row, and the convex portion 30 is formed with a top portion 32 forming the apex of the convex portion 30. The base portion 34 forming the starting point of the convex portion 30 and the oblique portion 36 connecting the top portion 32 and the base portion 34.
More specifically, the microbubble generating plate of the embodiment shown in FIG. 1 is a circular flat plate, and the thickness thereof is arbitrary depending on the application, but is usually 1 to 15 mm. In this embodiment, it is 2 mm.
The material for forming the microbubble generating plate is not particularly limited, but is preferably a material that does not deform even when heated, preferably a metal such as iron, stainless steel, aluminum, or copper, and is hydrophilic such as silicon or a resin having a hydrophilic group. Sexual materials can also be used.
As shown in FIG. 1, in the convex portion 30, a plurality of concentric convex portions 30 are continuously arranged from the central portion of the plate body toward the outer peripheral edge of the disk-shaped plate body. Although the convex portion on the peripheral edge is omitted in FIG. 1, the position to which the convex portion is provided is arbitrary, and for example, the outer peripheral edge can be provided.
＜特徴部分＞
そして、本実施形態の微小気泡発生板は、図２に示すように、基底部３４における任意の１点（図1に示すように基底部３４は凸部３０の形状に沿っており、凸部３０と同様に同心円が複数設けられて形成されており、この同心円状の複数の基底部３４の一点を選択した場合を意味する）と、該１点に対して頂部３２を挟んで対向する対向点との間の間隔（図２に示すｄ、基底部３４は約０．１〜０．３ｍｍの幅を有するので、その中央部をもって上記一点と対向点をとった）が０．１〜１ｍｍ、好ましくは０．３〜０．７ｍｍである。上記間隔ｄが０．１ｍｍ未満であると気泡が発生しにくくなり、１ｍｍを超えると気泡の粒径が大きくなりマイクロバブルとは言えなくなる。
また、対向する２つの斜部３６間の角度（図２のθ）が１５〜７５°であり、２０〜６０°であるのが好ましい。上記角度θが１０°未満であると、気泡の粒径の制御が困難となり、７５°を超えても気泡が発生しにくくなると共に気泡の粒径が大きくなる。
そして斜面３６に微細な凹凸３６ａが設けられている。すなわち、図２に示すように、凹凸３６ａは、斜部３６をフラットな斜面とした場合（図２の破線で示す部分）上下方向に連続して設けられており、全体的に階段状の形状を形成している。この凹凸の高さｔは０．０５〜０．３ｍｍであるのが好ましい。また、凹凸３６ａの幅ｗ１、ｗ２は、それぞれ上記の高さと同様にすることができる。この場合、図２ではｗ１、ｗ２はそれぞれ異なる幅を有するように記載しているが、これに限られず同じ幅とすることができる。
以上のことから間隔ｄと角度θとをどのようにするかで凸部３０の高さが決まることとなり、更に凹凸３６ａの高さを上述の範囲内でどの点に設定するかで階段状の凹凸の数も決定されることになる。
なお、本発明において微小気泡とは、いわゆるマイクロバブルと言われる粒子サイズの気泡を意味し、粒径で５００μｍ以下、好ましくは１００μｍ以下、さらに好ましくは５０μｍ以下の粒子径の気泡を意味する。
<Characteristic part>
Then, as shown in FIG. 2, the micro-bubble generating plate of the present embodiment has an arbitrary one point on the base portion 34 (as shown in FIG. 1, the base portion 34 follows the shape of the convex portion 30 and has a convex portion. Similar to 30), a plurality of concentric circles are provided and formed, which means that one point of the plurality of concentric base portions 34 is selected) and the one point is opposed to the one point with the top portion 32 in between. The distance between the points (d shown in FIG. 2, since the base 34 has a width of about 0.1 to 0.3 mm, the central portion is used as the opposite point to the above point) is 0.1 to 1 mm. , Preferably 0.3 to 0.7 mm. If the interval d is less than 0.1 mm, bubbles are less likely to be generated, and if it exceeds 1 mm, the particle size of the bubbles becomes large and cannot be called microbubbles.
Further, the angle between the two opposing inclined portions 36 (θ in FIG. 2) is 15 to 75 °, preferably 20 to 60 °. If the angle θ is less than 10 °, it becomes difficult to control the particle size of the bubbles, and even if the angle θ exceeds 75 °, the bubbles are less likely to be generated and the particle size of the bubbles becomes large.
The slope 36 is provided with fine irregularities 36a. That is, as shown in FIG. 2, the unevenness 36a is continuously provided in the vertical direction when the inclined portion 36 is a flat slope (the portion shown by the broken line in FIG. 2), and has an overall stepped shape. Is forming. The height t of the unevenness is preferably 0.05 to 0.3 mm. Further, the widths w1 and w2 of the unevenness 36a can be made the same as the above-mentioned heights, respectively. In this case, although it is described in FIG. 2 that w1 and w2 have different widths, the width is not limited to this and can be the same.
From the above, the height of the convex portion 30 is determined by how the interval d and the angle θ are set, and further, the height of the uneven portion 36a is set to any point within the above range in a stepped shape. The number of irregularities will also be determined.
In the present invention, the microbubbles mean bubbles having a particle size, so-called microbubbles, and have a particle size of 500 μm or less, preferably 100 μm or less, and more preferably 50 μm or less.
本実施形態の微小気泡発生板は、上述のように同心円状の凸部３０を複数設けることにより気泡発生部１０が形成されている。しかも凸部３０を構成する斜部に階段状の凹凸が形成された構成とされているため、気泡が小径のまま板表面から離脱することが可能となっている。
すなわち、上記凸部３０と各凸部３０に形成された凹凸３６ａを有することにより、通常なら気泡を表面に留める方向に作用していた表面張力を気泡離脱に働く力として作用させることができる。斜部で生成した気泡の成長は、斜部であること及び斜部に形成された微細な凹凸による物理的な制限を受ける。その一方で表面張力の作用により気泡は球形を維持しようとするために生成点である谷面部から移動しようとし、表面から離脱し、微小気泡が発生する。
In the micro bubble generating plate of the present embodiment, the bubble generating portion 10 is formed by providing a plurality of concentric convex portions 30 as described above. Moreover, since the diagonal portion forming the convex portion 30 is formed with stepped irregularities, the bubbles can be separated from the plate surface with a small diameter.
That is, by having the convex portion 30 and the unevenness 36a formed on each convex portion 30, the surface tension that normally acts in the direction of retaining the bubbles on the surface can be acted as a force acting on the bubble detachment. The growth of bubbles generated in the oblique portion is physically limited by the oblique portion and the fine irregularities formed in the oblique portion. On the other hand, due to the action of surface tension, the bubbles try to move from the valley surface, which is the generation point, in order to maintain the spherical shape, and separate from the surface to generate fine bubbles.
＜製造方法＞
本発明の微小気泡発生板は、ワイヤー放電加工、エッチング、モールド、プレス法等通常公知の金属板の微細加工技術を特に制限なく用いて製造することができる。また、金蔵３Ｄプリンターを用いて形成することもできる。このように３Ｄプリンターを用いて製造した場合には、この３Ｄプリンターを用いて製造したものをマザーとし、得られたマザーを用いてプレス加工により製造することもできる。
<Manufacturing method>
The microbubble generating plate of the present invention can be manufactured by using commonly known microfabrication techniques for metal plates such as wire electric discharge machining, etching, molding, and pressing without particular limitation. It can also be formed using a Kinzo 3D printer. In the case of manufacturing using a 3D printer in this way, the one manufactured using this 3D printer can be used as a mother, and the obtained mother can also be used for manufacturing by press working.
＜使用方法、用途＞
本発明の微小気泡発生板は、加熱する方法又は気体含有液体（炭酸水等）を用いる方法により液体中に微細気泡を発生させることができる。
加熱する方法は、板本体を気泡発生部が水中に面するようにしてヒーター、火などで加熱することにより実施できる。加熱温度は、液体の沸騰温度以上とするのが好ましい。
また、超音波を用いて加熱すると共に振動を付与することで気泡を発生させることも可能である。
気体含有液体を用いる方法は、たとえば炭酸水を用いる場合、炭酸水の中に微小気泡発生板を投入するか、あらかじめ微小気泡発生板が設置された容器に炭酸水を投入することにより実施できる。
従来、受動的な気泡径制御手法としては、表面粗さをサブミクロンオーダーで制御する必要があったが、本発明のように表面を特定の形状とすることにより、制御困難な表面粗さを細かく制御せずともいわゆるマイクロバブル程度の微小気泡を得ることができる。
<Usage and usage>
The microbubble generating plate of the present invention can generate microbubbles in a liquid by a method of heating or a method of using a gas-containing liquid (carbonated water or the like).
The method of heating can be carried out by heating the plate body with a heater, fire or the like so that the bubble generating portion faces the water. The heating temperature is preferably equal to or higher than the boiling temperature of the liquid.
It is also possible to generate bubbles by heating with ultrasonic waves and applying vibration.
The method of using the gas-containing liquid can be carried out, for example, when carbonated water is used, by putting the microbubble generating plate into the carbonated water or by putting the carbonated water into a container in which the microbubble generating plate is installed in advance.
Conventionally, as a passive bubble diameter control method, it has been necessary to control the surface roughness on the submicron order, but by making the surface into a specific shape as in the present invention, the surface roughness that is difficult to control can be controlled. It is possible to obtain microbubbles as small as so-called microbubbles without fine control.
本発明は上述した実施形態に何ら制限されるものではなく、本発明の趣旨を逸脱しない範囲で種々変形可能である。
たとえば、気泡発生部の凸部の形状は、上述のように同心円状ではなく、渦巻き状とすることで気泡発生部を形成してもよく、また直線状の凸部を複数個配列して矩形状の気泡発生部を設けてもよい。
また、凹凸の形状も上述のような階段状の形状ではなく、ランダムな突起が複数設けられた形態とすることもできる。
The present invention is not limited to the above-described embodiment, and can be variously modified without departing from the spirit of the present invention.
For example, the shape of the convex portion of the bubble generating portion may be spiral instead of concentric as described above, or a plurality of linear convex portions may be arranged and rectangular. A bubble generating portion having a shape may be provided.
Further, the shape of the unevenness is not the stepped shape as described above, but may be a form in which a plurality of random protrusions are provided.
以下、本発明について実施例及び比較例を示してさらに具体的に説明するが本発明はこれらに何ら制限されるものではない。 Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
〔実施例１〕
以下の様にして図１に示す微小気泡発生板を製造し、後述する試験例に記載の試験を行い、微小気泡の発生効率を測定した。
（微小気泡発生板の製造）
厚さ２．０ｍｍの円形のステンレス板（ＳＵＳ６３０）を用い、レーザー焼結型の金属３Ｄプリンター３ｄ Ｓｙｓｔｅｍｓ社製、商品名「ＰｒｏＸ３００」により、図１及び２に示す形態の気泡発生板を製造した（微小気泡発生部は全面ではなく中央部分に円形に設けた）。θは３０°であり、ｄは１ｍｍ、ｗ１＝ｗ２＝約０．２ｍｍ、ｔ＝約０．５〜０．８ｍｍ（製造時のレーザー照射状態により多少変動）、凸部全体の高さ＝約１．８ｍｍであった。
この際、この微小気泡発生板の加熱による気泡発生部で生成される気泡の観察を行った。加熱による気泡発生は、図３に示すように、周縁部に壁部を形成し、水位をもって水を投入できるように構成した微小気泡発生板に、板の上面から １cmの高さまで水を投入して、微小気泡発生板の下部からアルコールランプで加熱することにより気泡を発生させた。気泡の観察は、ビデオカメラを用いて撮影することにより行った。撮影した動画は核生成〜離脱までの瞬間気泡直径の測定及び気泡離脱過程の観察に使用した。
また、比較対象として、ワイヤー放電加工を施し、フラットな斜面からなる斜部を有する凸部により気泡発生部が形成された微小気泡発生板（間隔ｄ＝０．５ｍｍ、角度θ＝３０°、高さ深さＤ＝１．０１ｍｍ）を得た。
その結果、実施例の微小気泡発生板の方がより微細な気泡を安定して発生していることが判った。
[Example 1]
The microbubble generating plate shown in FIG. 1 was manufactured as follows, and the test described in the test example described later was performed to measure the microbubble generation efficiency.
(Manufacturing of micro bubble generator)
Using a circular stainless steel plate (SUS630) with a thickness of 2.0 mm, a laser-sintered metal 3D printer manufactured by 3d Systems, Inc., trade name "ProX300" was used to manufacture a bubble generating plate having the form shown in FIGS. 1 and 2. (The microbubble generating part is provided in a circle in the central part instead of the entire surface). θ is 30 °, d is 1 mm, w1 = w2 = about 0.2 mm, t = about 0.5 to 0.8 mm (varies slightly depending on the laser irradiation state at the time of manufacture), and the height of the entire convex portion = about. It was 1.8 mm.
At this time, the bubbles generated in the bubble generating portion by heating the microbubble generating plate were observed. As shown in FIG. 3, for the generation of air bubbles due to heating, water is poured up to a height of 1 cm from the upper surface of the fine bubble generating plate, which has a wall formed at the peripheral edge and is configured so that water can be poured at a water level. Then, bubbles were generated by heating from the lower part of the microbubble generating plate with an alcohol lamp. The bubbles were observed by photographing with a video camera. The video taken was used to measure the instantaneous bubble diameter from nucleation to detachment and to observe the bubble detachment process.
Further, as a comparison target, a micro-bubble generating plate (interval d = 0.5 mm, angle θ = 30 °, height) in which a bubble generating portion is formed by a convex portion having an inclined portion formed of a flat slope by wire electric discharge machining. Depth D = 1.01 mm) was obtained.
As a result, it was found that the fine bubble generating plate of the example stably generated finer bubbles.
本発明の微小気泡発生板は、マイクロバブルを手軽に利用したい場合に活用可能であり、各種殺菌、洗浄用途等マイクロバブルの利用用途として公知の分野に利用できる他、加熱によりマイクロバブルを発生する性質を利用してヒーター型バブリング装置や各種調理器具など種々用途に応用可能である。 The micro-bubble generating plate of the present invention can be used when it is desired to easily use the micro-bubbles, and can be used in known fields such as various sterilization and cleaning applications, and also generates micro-bubbles by heating. Utilizing its properties, it can be applied to various applications such as heater-type bubbling devices and various cooking utensils.
Claims (1)
上記気泡発生部は、基面上に複数の凸部を、列を形成するように設けることで形成されており、
上記凸部は、該凸部の頂点を形成する頂部と、該凸部の起点を形成する基底部と、該頂部
及び該基底部をつなぐ斜部とからなり、
上記凸部の高さが１．８ｍｍであり、
上記頂部を挟んで対抗する２つの基底部間の間隔が１ｍｍであり、
対向する２つの上記斜部間の角度が３０°であり、
上記斜部に微細な凹凸が設けられており、該凹凸は、全体的に階段状の形状で、この凹凸の高さｔは０．５〜０．８ｍｍであり、幅は０．２ｍｍであることを特徴とする微小気泡発生板。
In a microbubble generating plate having a bubble generating portion that generates microbubbles from the surface in a liquid,
It said bubble generating portion, the convex portion of the multiple on the base surface is formed by providing to form a row,
The convex portion is composed of a top portion forming the apex of the convex portion, a base portion forming the starting point of the convex portion, and an oblique portion connecting the top portion and the base portion.
The height of the convex portion is 1.8 mm, and the height of the convex portion is 1.8 mm.
The distance between the two bases that oppose each other across the top is 1 mm.
The angle between the two opposing slopes is 30 ° .
The inclined portion is provided with fine irregularities, and the irregularities have a stepped shape as a whole, and the height t of the irregularities is 0.5 to 0.8 mm and the width is 0.2 mm. A micro-bubble generating plate characterized by this.
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