JP7447722B2 - electrohydrodynamic pump - Google Patents

electrohydrodynamic pump Download PDF

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JP7447722B2
JP7447722B2 JP2020125197A JP2020125197A JP7447722B2 JP 7447722 B2 JP7447722 B2 JP 7447722B2 JP 2020125197 A JP2020125197 A JP 2020125197A JP 2020125197 A JP2020125197 A JP 2020125197A JP 7447722 B2 JP7447722 B2 JP 7447722B2
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flow path
negative electrode
target fluid
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electrohydrodynamic pump
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JP2022021557A (en
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智浩 笹尾
英夫 古川
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Miura Co Ltd
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Miura Co Ltd
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本発明は、電気流体力学ポンプに関する。 The present invention relates to electrohydrodynamic pumps.

絶縁性を有する流体に電圧を印加することで流体に流れが生じる電気流体力学効果が知られている。この電気流体力学効果を利用して、流体を吐出する電気流体力学ポンプが提案されている。電気流体力学ポンプは、インペラのような可動部材を必要としないため、小型化が可能である。 2. Description of the Related Art Electrohydrodynamic effects are known in which a flow is generated in an insulating fluid by applying a voltage to the fluid. An electrohydrodynamic pump that discharges fluid by utilizing this electrohydrodynamic effect has been proposed. Electrohydrodynamic pumps do not require moving parts such as impellers, so they can be made smaller.

具体例として、棒状又はメッシュ状に形成され、直流電圧が印加される１又は複数の電極対（正極及び負極）を有し、流路の上流側に流路を横断するよう負極を配置し、下流側に正極を負極と平行に配置した電気流体力学ポンプが提案されている（例えば、特許文献１参照）。 As a specific example, it is formed into a rod shape or a mesh shape, has one or more electrode pairs (positive electrode and negative electrode) to which a DC voltage is applied, and the negative electrode is arranged on the upstream side of the flow path so as to cross the flow path, An electrohydrodynamic pump in which a positive electrode is arranged in parallel with a negative electrode on the downstream side has been proposed (see, for example, Patent Document 1).

特開２０１０－６３３４２号公報Japanese Patent Application Publication No. 2010-63342

従来の電気流体力学ポンプは、差圧（全揚程）が小さいため、用途が限定される。このため、本発明は、差圧が大きい電気流体力学ポンプを提供することを目的とする。 Conventional electrohydrodynamic pumps have limited applications due to their low differential pressure (total head). Therefore, an object of the present invention is to provide an electrohydrodynamic pump with a large differential pressure.

本発明の一態様に係る電気流体力学ポンプは、絶縁性を有する対象流体に電圧を印加することで前記対象流体に流れを生じさせる電気流体力学ポンプであって、下流側に向かって断面積が減少する作用流路を有する流路部材と、前記作用流路の上流側に配設される負極と、前記作用流路の下流側に配設される正極と、を備える。 An electrohydrodynamic pump according to one aspect of the present invention is an electrohydrodynamic pump that generates a flow in a target fluid by applying a voltage to the target fluid having an insulating property, and the cross-sectional area of the target fluid increases toward the downstream side. It includes a flow path member having a decreasing working flow path, a negative electrode disposed upstream of the working flow path, and a positive electrode disposed downstream of the working flow path.

前記電気流体力学ポンプにおいて、前記負極及び前記正極の少なくとも一方は、メッシュ状であってもよい。 In the electrohydrodynamic pump, at least one of the negative electrode and the positive electrode may have a mesh shape.

前記電気流体力学ポンプにおいて、前記負極はメッシュ状であり、前記正極はパイプ状又は針状であってもよい。 In the electrohydrodynamic pump, the negative electrode may have a mesh shape, and the positive electrode may have a pipe shape or a needle shape.

前記電気流体力学ポンプにおいて、前記正極の長手方向は、前記対象流体の流れ方向と平行であってもよい。 In the electrohydrodynamic pump, the longitudinal direction of the positive electrode may be parallel to the flow direction of the target fluid.

前記電気流体力学ポンプは、前記作用流路に前記対象流体を供給する吸込流路を画定すると共に、前記負極を保持する吸込保持部材と、前記作用流路から流出する前記対象流体を案内する吐出流路を画定すると共に、前記正極を保持する吐出保持部材と、をさらに備えてもよい。 The electrohydrodynamic pump defines a suction channel that supplies the target fluid to the working channel, and includes a suction holding member that holds the negative electrode, and a discharge that guides the target fluid flowing out from the working channel. The device may further include a discharge holding member that defines a flow path and holds the positive electrode.

本発明によれば、差圧が大きい電気流体力学ポンプを提供できる。 According to the present invention, an electrohydrodynamic pump with a large differential pressure can be provided.

本発明の第１実施形態に係る電気流体力学ポンプを示す断面図である。FIG. 1 is a sectional view showing an electrohydrodynamic pump according to a first embodiment of the present invention. 本発明の第２実施形態に係る電気流体力学ポンプを示す断面図である。FIG. 3 is a sectional view showing an electrohydrodynamic pump according to a second embodiment of the present invention. 本発明の第３実施形態に係る電気流体力学ポンプを示す断面図である。FIG. 3 is a sectional view showing an electrohydrodynamic pump according to a third embodiment of the present invention. 本発明の第４実施形態に係る電気流体力学ポンプを示す断面図である。It is a sectional view showing an electrohydrodynamic pump according to a fourth embodiment of the present invention. 本発明に係る電気流体力学ポンプの実施例における印加電圧に対する差圧の関係を示すグラフである。3 is a graph showing the relationship between applied voltage and differential pressure in an embodiment of the electrohydrodynamic pump according to the present invention.

以下、本発明に係る電気流体力学ポンプの各実施形態について、図面を参照しながら説明をする。なお、以下の説明において、後から説明する実施形態の先に説明した実施形態と同一の構成要素については同一の符号を付して、重複する説明を省略することがある。 Hereinafter, each embodiment of the electrohydrodynamic pump according to the present invention will be described with reference to the drawings. In addition, in the following description, the same reference numerals may be attached to the same components of the embodiment described later as those of the previously described embodiment, and the redundant explanation may be omitted.

＜第１実施形態＞
図１は、本発明の第１実施形態の電気流体力学ポンプ１の断面図である。電気流体力学ポンプ１は、絶縁性を有する対象流体に電圧を印加することで対象流体に流れを生じさせるポンプである。図１において、電気流体力学ポンプ１の左右の矢印は、対象流体の流れ方向を示す。本実施形態の電気流体力学ポンプ１は、流路部材１０と、負極２０と、正極３０と、吸込保持部材４０と、吐出保持部材５０と、吸込キャップ６０と、吐出キャップ７０と、を備える。 <First embodiment>
FIG. 1 is a sectional view of an electrohydrodynamic pump 1 according to a first embodiment of the present invention. The electrohydrodynamic pump 1 is a pump that applies a voltage to an insulating target fluid to generate a flow in the target fluid. In FIG. 1, the left and right arrows of the electrohydrodynamic pump 1 indicate the flow direction of the target fluid. The electrohydrodynamic pump 1 of this embodiment includes a flow path member 10, a negative electrode 20, a positive electrode 30, a suction holding member 40, a discharge holding member 50, a suction cap 60, and a discharge cap 70.

流路部材１０は、対象流体が流れる作用流路１１を有する隔壁部１２と、隔壁部１２の外側に設けられ、負極２０、正極３０、吸込保持部材４０及び吐出保持部材５０を収容する筒状のハウジング部１３とを有する。 The flow path member 10 includes a partition part 12 having a working flow path 11 through which the target fluid flows, and a cylindrical part provided on the outside of the partition part 12 and housing a negative electrode 20, a positive electrode 30, a suction holding member 40, and a discharge holding member 50. It has a housing part 13.

隔壁部１２は、所望の形状の作用流路１１を画定し、対象流体の流路を作用流路１１のみに限定するために、ハウジング部１３の内部を封止して上流側の空間と下流側の空間とを隔離するよう形成することができる。 The partition part 12 seals the inside of the housing part 13 and separates the upstream space from the downstream space in order to define the working flow path 11 of a desired shape and limit the flow path of the target fluid only to the working flow path 11. It can be formed so as to isolate it from the side space.

作用流路１１の断面積は、下流側に向かって減少する。これによって、作用流路１１内で対象流体の圧力を増大することができる。本実施形態の電気流体力学ポンプ１において、作用流路１１は円錐状に形成されている。 The cross-sectional area of the working channel 11 decreases toward the downstream side. Thereby, the pressure of the target fluid within the working channel 11 can be increased. In the electrohydrodynamic pump 1 of this embodiment, the working flow path 11 is formed in a conical shape.

作用流路１１の入口の径の出口の径に対する比の下限としては、例えば５以上２０以下、好ましくは８以上１５以下とすることができる。これによって、対象流体の圧力を十分に増大することができる。 The lower limit of the ratio of the diameter of the inlet to the diameter of the outlet of the working channel 11 can be, for example, 5 or more and 20 or less, preferably 8 or more and 15 or less. This allows the pressure of the target fluid to be sufficiently increased.

作用流路１１の径の流路長さ（入口と出口の距離、ひいては負極２０と正極３０との距離）に対する比としては、例えば１以上１０以下、好ましくは２以上８以下とすることができる。これによって、比較的小さい流路長さで対象流体の圧力を大きくできる。特に、作用流路１１の径の流路長さを小さくすることによって、電気流体力学ポンプ１の差圧をより大きくできる。 The ratio of the diameter of the working channel 11 to the channel length (distance between the inlet and the outlet, and therefore the distance between the negative electrode 20 and the positive electrode 30) can be, for example, 1 or more and 10 or less, preferably 2 or more and 8 or less. . Thereby, the pressure of the target fluid can be increased with a relatively small channel length. In particular, by reducing the length of the diameter of the working flow path 11, the differential pressure of the electrohydrodynamic pump 1 can be further increased.

ハウジング部１３は、隔壁部１２の上流側に吸込保持部材４０を保持するために、例えば吸込保持部材４０が螺合する内ねじ等の吸込取付構造１４を有してもよい。同様に、ハウジング部１３は、隔壁部１２の下流側に吐出保持部材５０を保持するための吐出取付構造１５を有してもよい。 In order to hold the suction holding member 40 on the upstream side of the partition wall portion 12, the housing portion 13 may have a suction mounting structure 14 such as an internal thread into which the suction holding member 40 is screwed, for example. Similarly, the housing section 13 may have a discharge mounting structure 15 for holding the discharge holding member 50 on the downstream side of the partition wall section 12 .

また、ハウジング部１３は、対象流体を漏出することなく、内部に配置される負極２０及び正極３０に外部の電池Ｂから電圧を印加するための配線Ｌを接続可能にする配線部１６が設けられている。配線部１６は、例として、配線Ｌを引き出す開口と配線Ｌとの隙間を封止する封止構造、ハウジング部１３に気密に取り付けられ、内側に配線Ｌが接続され、外側に電池Ｂからの給電線を接続する端子構造などとすることができる。 Further, the housing part 13 is provided with a wiring part 16 that allows connection of a wiring L for applying voltage from an external battery B to the negative electrode 20 and the positive electrode 30 arranged inside the housing part 13 without leaking the target fluid. ing. For example, the wiring part 16 has a sealing structure that seals the gap between the opening from which the wiring L is drawn out and the wiring L, and is airtightly attached to the housing part 13, with the wiring L connected to the inside and the wiring from the battery B to the outside. It can have a terminal structure for connecting a power supply line.

負極２０は、例えばメッシュ状、格子状等の対象流体が通過できる開口又は隙間を有する形状を有し、好ましくは対象流体との接触面積が大きいメッシュ状とされる。具体的には、負極２０は、金属金網、好ましくは比較的強度が大きいステンレス金網によって形成することができる。 The negative electrode 20 has a shape having openings or gaps through which the target fluid can pass, such as a mesh shape or a lattice shape, and preferably a mesh shape that has a large contact area with the target fluid. Specifically, the negative electrode 20 can be formed of a metal wire mesh, preferably a stainless steel wire mesh with relatively high strength.

負極２０は、作用流路１１に流入する対象流体と効率よく接触できるよう、作用流路１１の入口を覆うよう配置されることが好ましい。また、負極２０は、正極３０との距離を一定にするよう、対象流体の流れ方向に略垂直に配置されることが好ましい。 It is preferable that the negative electrode 20 is disposed to cover the inlet of the working channel 11 so that it can efficiently contact the target fluid flowing into the working channel 11 . Further, it is preferable that the negative electrode 20 is arranged substantially perpendicular to the flow direction of the target fluid so that the distance from the positive electrode 30 is constant.

負極２０の開口率としては、１５％以上８０％以下が好ましく、２０％以上６５％以下がより好ましく、２５％以上５０％以下さらに好ましい。これによって、負極２０による流路抵抗の増大を抑制しつつ負極２０と対象流体との接触面積を確保して、対象流体に差圧を付与することができる。 The aperture ratio of the negative electrode 20 is preferably 15% or more and 80% or less, more preferably 20% or more and 65% or less, and even more preferably 25% or more and 50% or less. Thereby, it is possible to secure a contact area between the negative electrode 20 and the target fluid while suppressing an increase in flow path resistance due to the negative electrode 20, and to apply a pressure difference to the target fluid.

負極２０は、対象流体を流れやすくするために、部分的に大きい開口又は隙間を有してもよい。具体例として、負極２０は、メッシュ状の材料に開口を形成したものであってもよい。 The negative electrode 20 may partially have large openings or gaps in order to facilitate the flow of the target fluid. As a specific example, the negative electrode 20 may be made of a mesh-like material with openings formed therein.

正極３０は、負極２０と同様に、メッシュ状に形成され、作用流路１１の出口を覆うよう配置することができる。正極３０は、開口面積が小さい作用流路１１の出口を覆うため、対象流体との接触面積を確保するために、均等なメッシュ状であることが好ましい。 Like the negative electrode 20, the positive electrode 30 is formed in a mesh shape and can be arranged to cover the outlet of the working channel 11. Since the positive electrode 30 covers the outlet of the working channel 11, which has a small opening area, it is preferable that the positive electrode 30 has a uniform mesh shape in order to ensure a contact area with the target fluid.

吸込保持部材４０は、作用流路１１に対象流体を供給する吸込流路４１を画定すると共に、負極２０を保持する。具体的には、吸込保持部材４０は、中央部を貫通する吸込流路４１と、外周部に設けられ、流路部材１０に固定するための固定構造４２と、先端部に設けられ、負極２０を保持するための保持構造４３と、配線Ｌを配置する配線孔４４と、を有する構成とすることができる。 The suction holding member 40 defines a suction flow path 41 that supplies the target fluid to the working flow path 11 and holds the negative electrode 20 . Specifically, the suction holding member 40 includes a suction passage 41 penetrating through the center, a fixing structure 42 provided at the outer circumference for fixing to the passage member 10, and a fixing structure 42 provided at the tip and connected to the negative electrode 20. The structure may include a holding structure 43 for holding the wiring L, and a wiring hole 44 in which the wiring L is placed.

吸込流路４１の流路面積は、作用流路１１の入口の開口面積以上とされる。具体例として、吸込流路４１は、作用流路１１と同軸に形成され、作用流路１１の入口の開口と等しい一定の断面形状を有する。 The flow area of the suction flow path 41 is greater than or equal to the opening area of the inlet of the working flow path 11 . As a specific example, the suction channel 41 is formed coaxially with the working channel 11 and has a constant cross-sectional shape that is equal to the opening of the inlet of the working channel 11 .

固定構造４２は、例えば流路部材１０のハウジング部１３の内周面に形成される内ねじに螺合する外ねじとすることができる。また、固定構造４２は、流路部材１０の隔壁部１２に形成されるネジ穴に螺合するボルトが挿通されるボルト孔等であってもよい。 The fixing structure 42 can be, for example, an external thread that is threaded into an internal thread formed on the inner circumferential surface of the housing portion 13 of the flow path member 10. Further, the fixing structure 42 may be a bolt hole or the like into which a bolt that is threaded into a screw hole formed in the partition wall 12 of the channel member 10 is inserted.

保持構造４３は、負極２０の形状等に応じて適宜設計することができる。具体例として、保持構造４３は、吸込保持部材４０の先端面に当接させた負極２０の外周部を吸込保持部材４０の外周に沿うよう上流側に折り曲げることができるようにする小径部とすることができる。このような構成では、折り曲げた負極２０の外周部をバンド等で締め付けることによって吸込保持部材４０に負極２０を固定してもよい。また、保持構造４３は、吸込保持部材４０の先端面に負極２０を接着剤によって接着する構成とされてもよく、例えばフランジ、キャップ等で吸込保持部材４０の先端面に負極２０を固定する構成とされてもよい。保持構造４３を省略して、負極２０を隔壁部１２に直接位置決め及び固定できるようにしてもよいが、吸込保持部材４０が保持構造４３を有することで、容易且つ確実に負極２０を作用流路１１の入口に配置することができる。 The holding structure 43 can be designed as appropriate depending on the shape of the negative electrode 20 and the like. As a specific example, the holding structure 43 is a small diameter portion that allows the outer circumference of the negative electrode 20 that is in contact with the distal end surface of the suction holding member 40 to be bent upstream along the outer circumference of the suction holding member 40. be able to. In such a configuration, the negative electrode 20 may be fixed to the suction holding member 40 by tightening the outer peripheral portion of the bent negative electrode 20 with a band or the like. Further, the holding structure 43 may have a structure in which the negative electrode 20 is bonded to the distal end surface of the suction holding member 40 using an adhesive, or, for example, a structure in which the negative electrode 20 is fixed to the distal end surface of the suction holding member 40 using a flange, a cap, etc. may be taken as Although the holding structure 43 may be omitted so that the negative electrode 20 can be directly positioned and fixed to the partition wall 12, the suction holding member 40 having the holding structure 43 can easily and reliably hold the negative electrode 20 in the working channel. 11 entrances.

吐出保持部材５０は、吸込保持部材４０と対をなすよう、作用流路１１から流出する対象流体を案内する吐出流路５１を画定すると共に、正極３０を保持する。具体的には、吐出保持部材５０は、吸込保持部材４０と同様に、中央部を貫通して形成する吐出流路５１と、外周部に設けられ、流路部材１０に固定するための固定構造５２と、先端部に設けられ、正極３０を保持するための保持構造５３と、配線Ｌを配置する配線孔５４と、を有する構成とすることができる。 The discharge holding member 50 defines a discharge flow path 51 that guides the target fluid flowing out from the working flow path 11 and holds the positive electrode 30 so as to form a pair with the suction holding member 40 . Specifically, like the suction holding member 40, the discharge holding member 50 includes a discharge flow path 51 formed by penetrating the central portion, and a fixing structure provided on the outer periphery for fixing to the flow path member 10. 52, a holding structure 53 provided at the tip for holding the positive electrode 30, and a wiring hole 54 in which the wiring L is disposed.

吸込キャップ６０は、流路部材１０の上流側の端部を閉鎖し、対象流体を供給する配管（不図示）を接続できるよう構成される。吸込キャップ６０の流路部材１０に固定するための構造は、技術常識に基づいて適宜選択できるが、本実施形態ではフランジ状の構造とされている。また、吸込キャップ６０の配管を接続するための構造は、技術常識に基づいて適宜選択できるが、本実施形態では管用の雌ねじとされている。 The suction cap 60 is configured to close the upstream end of the flow path member 10 and connect a pipe (not shown) for supplying the target fluid. The structure for fixing the suction cap 60 to the flow path member 10 can be appropriately selected based on common technical knowledge, but in this embodiment, it is a flange-like structure. Further, the structure for connecting the piping of the suction cap 60 can be appropriately selected based on common technical knowledge, but in this embodiment, it is a female thread for a pipe.

吐出キャップ７０は、吸込キャップ６０と対をなすように、流路部材１０の下流側の端部を閉鎖し、対象流体を吐出する配管（不図示）を接続できるよう構成される。吐出キャップ７０の構造も、技術常識に基づいて適宜選択できる。 The discharge cap 70 is configured as a pair with the suction cap 60 to close the downstream end of the flow path member 10 and to be connected to a pipe (not shown) for discharging the target fluid. The structure of the discharge cap 70 can also be appropriately selected based on common technical knowledge.

以上の構成を有する電気流体力学ポンプ１は、負極２０が対象流体に電荷を付与し、電荷が付与された対象流体を正極３０が静電気力によって吸引して対象流体から電荷を回収する。これにより、対象流体が作用流路１１の中を上流側から下流側に移動する。このとき、作用流路１１の断面積が下流側に向かって減少していることで、差圧を増大することができる。 In the electrohydrodynamic pump 1 having the above configuration, the negative electrode 20 applies an electric charge to the target fluid, and the positive electrode 30 attracts the charged target fluid by electrostatic force to recover the electric charge from the target fluid. Thereby, the target fluid moves in the working channel 11 from the upstream side to the downstream side. At this time, since the cross-sectional area of the working channel 11 decreases toward the downstream side, the differential pressure can be increased.

＜第２実施形態＞
図２は、本発明の第２実施形態の電気流体力学ポンプ１Ａの断面図である。本実施形態の電気流体力学ポンプ１Ａは、複数組の流路部材１０、負極２０、正極３０、吸込保持部材４０、及び吐出保持部材５０と、１組の吸込キャップ６０及び吐出キャップ７０と、を備える。 <Second embodiment>
FIG. 2 is a sectional view of an electrohydrodynamic pump 1A according to a second embodiment of the present invention. The electrohydrodynamic pump 1A of this embodiment includes a plurality of sets of channel members 10, a negative electrode 20, a positive electrode 30, a suction holding member 40, and a discharge holding member 50, and one set of a suction cap 60 and a discharge cap 70. Be prepared.

図２の電気流体力学ポンプ１Ａは、図１の電気流体力学ポンプ１の吸込キャップ６０及び吐出キャップ７０を除く要部を直列に複数並べて配設したもの、つまり図１の電気流体力学ポンプ１を多段化したものである。この構成によって、本実施形態の電気流体力学ポンプ１Ａは、図１の電気流体力学ポンプ１よりも高い差圧を得ることができる。 The electrohydrodynamic pump 1A of FIG. 2 has a plurality of main parts of the electrohydrodynamic pump 1 of FIG. 1, except for the suction cap 60 and the discharge cap 70, arranged in series. It has multiple stages. With this configuration, the electrohydrodynamic pump 1A of this embodiment can obtain a higher differential pressure than the electrohydrodynamic pump 1 of FIG. 1.

＜第３実施形態＞
図３は、本発明の第３実施形態の電気流体力学ポンプ１Ｂの断面図である。本実施形態の電気流体力学ポンプ１Ｂは、流路部材１０Ｂと、負極２０と、正極３０と、吸込保持部材４０と、吐出保持部材５０と、吸込キャップ６０と、吐出キャップ７０と、を備える。 <Third embodiment>
FIG. 3 is a sectional view of an electrohydrodynamic pump 1B according to a third embodiment of the present invention. The electrohydrodynamic pump 1B of this embodiment includes a flow path member 10B, a negative electrode 20, a positive electrode 30, a suction holding member 40, a discharge holding member 50, a suction cap 60, and a discharge cap 70.

流路部材１０Ｂは、対象流体が流れる作用流路１１Ｂを有する隔壁部１２Ｂと、隔壁部１２Ｂの外側に設けられ、吸込保持部材４０及び吐出保持部材５０を収容する筒状のハウジング部１３とを有する。 The flow path member 10B includes a partition wall portion 12B having a working flow path 11B through which the target fluid flows, and a cylindrical housing portion 13 provided on the outside of the partition wall portion 12B and housing the suction holding member 40 and the discharge holding member 50. have

作用流路１１Ｂは、対象流体の流れ方向（作用流路１１Ｂの中心軸）に対する外壁の傾斜角度が下流に向かって減少するベルマウス状に形成されている。これによって、作用流路１１Ｂにおける対象流体の流路抵抗が小さくなるので、対象流体の流量を大きくした場合の差圧の落ち込みを抑制することができる。 The working channel 11B is formed in a bellmouth shape in which the inclination angle of the outer wall with respect to the flow direction of the target fluid (the central axis of the working channel 11B) decreases toward the downstream. This reduces the flow path resistance of the target fluid in the working flow path 11B, so it is possible to suppress a drop in the differential pressure when the flow rate of the target fluid is increased.

＜第４実施形態＞
図４は、本発明の第４実施形態の電気流体力学ポンプ１Ｃの断面図である。本実施形態の電気流体力学ポンプ１Ｃは、流路部材１０Ｃと、負極２０と、正極３０Ｃと、吸込保持部材４０と、吐出保持部材５０Ｃと、吸込キャップ６０と、吐出キャップ７０と、を備える。 <Fourth embodiment>
FIG. 4 is a sectional view of an electrohydrodynamic pump 1C according to a fourth embodiment of the present invention. The electrohydrodynamic pump 1C of this embodiment includes a flow path member 10C, a negative electrode 20, a positive electrode 30C, a suction holding member 40, a discharge holding member 50C, a suction cap 60, and a discharge cap 70.

流路部材１０Ｃは、対象流体が流れる作用流路１１と、作用流路１１の下流側に連続する吐出流路１７と、吐出保持部材５０Ｃを保持する吐出取付構造１５Ｃと、を有する隔壁部１２Ｃと、隔壁部１２Ｃの外側に設けられる筒状のハウジング部１３Ｃとを有する。 The flow path member 10C includes a partition wall portion 12C that has a working flow path 11 through which the target fluid flows, a discharge flow path 17 continuous to the downstream side of the working flow path 11, and a discharge mounting structure 15C that holds the discharge holding member 50C. and a cylindrical housing portion 13C provided outside the partition wall portion 12C.

正極３０Ｃは、針状に形成され、吐出流路１７の中心軸上に長手方向が対象流体の流れ方向と平行に延びるよう保持される。対象流体は、吐出流路１７の外壁と正極３０Ｃの外周面との間の空間を流れる。これによって、正極３０Ｃの対象流体との接触面積を大きくできるので、より確実に負極２０で付与された電荷を回収することができる。これにより、電荷を回収できずに正極３０を通過した対象流体に上流側に引き戻す力が作用することを防止できるので、電気流体力学ポンプ１Ｃが生じさせる差圧を大きくすることができる。なお、正極３０Ｃは、対象流体との接触面積を増大するために、中空のパイプ状に形成されてその内部にも対象流体の流路を形成してもよい。 The positive electrode 30C is formed into a needle shape and is held on the central axis of the discharge flow path 17 so that its longitudinal direction extends parallel to the flow direction of the target fluid. The target fluid flows in the space between the outer wall of the discharge flow path 17 and the outer peripheral surface of the positive electrode 30C. As a result, the contact area of the positive electrode 30C with the target fluid can be increased, so that the charge applied by the negative electrode 20 can be recovered more reliably. As a result, it is possible to prevent a force from acting on the target fluid that has passed through the positive electrode 30 without being able to recover the charge to the upstream side, thereby increasing the differential pressure generated by the electrohydrodynamic pump 1C. In addition, in order to increase the contact area with the target fluid, the positive electrode 30C may be formed in the shape of a hollow pipe, and a flow path for the target fluid may also be formed inside the positive electrode 30C.

吐出保持部材５０Ｃは、正極３０Ｃを保持する保持部５５と、ハウジング部１３Ｃの吐出取付構造１５Ｃに係合する取付部５６と、保持部５５と取付部５６を接続するよう放射状に延びる接続部５７と、を有することができる。 The discharge holding member 50C includes a holding part 55 that holds the positive electrode 30C, a mounting part 56 that engages with the discharge mounting structure 15C of the housing part 13C, and a connecting part 57 that extends radially to connect the holding part 55 and the mounting part 56. and can have.

以上、本発明の電気流体力学ポンプの好ましい各実施形態につき説明したが、本発明は、上述の実施形態に制限されるものではなく、適宜変更が可能である。 Although each preferred embodiment of the electrohydrodynamic pump of the present invention has been described above, the present invention is not limited to the above-described embodiments, and can be modified as appropriate.

例として、本発明の電気流体力学ポンプにおいて、流路部材以外の構成要素が他の部材を収容するハウジングを有してもよく、他の部材を収容するハウジングを有さず、流路部材、吐出保持部材、及び排出保持部材が互いに気密に接続されてもよい。 For example, in the electrohydrodynamic pump of the present invention, components other than the channel member may have a housing that accommodates the other member, or may not have a housing that accommodates the other member, and the channel member, The discharge holding member and the discharge holding member may be airtightly connected to each other.

また、本発明の電気流体力学ポンプでは、吸込流路も流路部材によって画定されてもよい。この場合、吸込流路の中に負極が保持される。 Furthermore, in the electrohydrodynamic pump of the present invention, the suction channel may also be defined by the channel member. In this case, the negative electrode is held within the suction channel.

また、本発明の電気流体力学ポンプについて、作用流路は、外壁の流れ方向に対する傾斜角度が下流側に向かって増大する形状であってもよく、外壁の流れ方向に対する傾斜角度が中央部から上流側及び下流側の両側に向かってそれぞれ減少する形状であってもよい。 Further, in the electrohydrodynamic pump of the present invention, the working channel may have a shape in which the inclination angle of the outer wall with respect to the flow direction increases toward the downstream side, and the inclination angle of the outer wall with respect to the flow direction increases from the central part to the upstream part. It may have a shape that decreases toward both the side and the downstream side.

また、本発明の電気流体力学ポンプでは、負極が作用流路の上流側に、正極が作用流路の下流側に配置されるが、これは負極と正極との位置関係を意図するものであって、負極が作用流路よりも上流側、正極が作用流路よりも下流側に配置されることを要求するものではない。従って、本発明の電気流体力学ポンプにおける負極及び正極は、流路部材が画定する作用流路の途中に配置されてもよい。 Furthermore, in the electrohydrodynamic pump of the present invention, the negative electrode is placed on the upstream side of the working flow path, and the positive electrode is placed on the downstream side of the working flow path, but this is not intended to be the positional relationship between the negative electrode and the positive electrode. However, it is not required that the negative electrode be disposed upstream of the working flow path and the positive electrode disposed downstream of the working flow path. Therefore, the negative electrode and the positive electrode in the electrohydrodynamic pump of the present invention may be placed in the middle of the working flow path defined by the flow path member.

以下に、実施例を挙げて本発明をさらに詳しく説明するが、本発明はこれらの実施例に限定されるものではない。 EXAMPLES The present invention will be explained in more detail below with reference to Examples, but the present invention is not limited to these Examples.

上述の実施形態に準じ、作用流路、負極及び正極の形状が異なる電気流体力学ポンプの試作例１～３を作成し、３Ｍ社の「ノベック」を対象流体として、１０ｋＶの電圧を印加することにより生じる差圧を測定した。 In accordance with the above-described embodiment, prototype examples 1 to 3 of electrohydrodynamic pumps having different shapes of working channels, negative electrodes, and positive electrodes were created, and a voltage of 10 kV was applied using 3M's "Novec" as the target fluid. The differential pressure caused by this was measured.

試作例１の電気流体力学ポンプは、作用流路を断面積が一定の円筒状とし、負極及び正極としてステンレス鋼製金網を使用した。作用流路の口径は２０ｍｍ、作用流路の長さは５ｍｍとした。負極及び正極のメッシュサイズは、＃２００（素線径０．０５ｍｍ、開口率３６．８％）とした。 The electrohydrodynamic pump of Prototype Example 1 had a cylindrical working flow path with a constant cross-sectional area, and used stainless steel wire mesh as the negative and positive electrodes. The diameter of the working channel was 20 mm, and the length of the working channel was 5 mm. The mesh size of the negative electrode and positive electrode was #200 (wire diameter 0.05 mm, aperture ratio 36.8%).

試作例２の電気流体力学ポンプは、作用流路を下流側ほど断面積が小さい円錐台状とし、負極及び正極としてステンレス鋼製金網を使用した。作用流路の入口の口径は２５ｍｍ、作用流路の出口の口径は２ｍｍ、作用流路の長さは５ｍｍとした。負極及び正極のメッシュサイズは、＃６３５（素線径０．０２ｍｍ、開口率２５％）とした。 In the electrohydrodynamic pump of Prototype Example 2, the working flow path had a truncated conical shape with a cross-sectional area smaller toward the downstream side, and stainless steel wire mesh was used as the negative and positive electrodes. The diameter of the inlet of the working channel was 25 mm, the diameter of the outlet of the working channel was 2 mm, and the length of the working channel was 5 mm. The mesh size of the negative electrode and positive electrode was #635 (wire diameter 0.02 mm, aperture ratio 25%).

試作例３の電気流体力学ポンプは、作用流路を下流側ほど断面積が小さい円錐台状とし、負極及び正極としてステンレス鋼製金網を使用し、負極には開口を形成した。作用流路の入口の口径は２５ｍｍ、作用流路の出口の口径は２ｍｍ、作用流路の長さは５ｍｍとした。負極及び正極のメッシュサイズは、＃２５０（素線径０．０３ｍｍ、開口率４９．７％）とした。負極の開口の径は５ｍｍとした。 In the electrohydrodynamic pump of Prototype Example 3, the working channel had a truncated conical shape with a cross-sectional area smaller toward the downstream side, stainless steel wire mesh was used as the negative electrode and the positive electrode, and an opening was formed in the negative electrode. The diameter of the inlet of the working channel was 25 mm, the diameter of the outlet of the working channel was 2 mm, and the length of the working channel was 5 mm. The mesh size of the negative electrode and the positive electrode was #250 (wire diameter 0.03 mm, aperture ratio 49.7%). The diameter of the opening of the negative electrode was 5 mm.

差圧の測定方法としては、透明な水槽から対象流体を電気流体力学ポンプに供給し、電気流体力学ポンプの吐出配管として透明なチューブを使用し、水槽の液面の高さと吐出配管の液面との高さの差を測定することで、電気流体力学ポンプが発生する差圧を算出した。つまり、今回の試験では、流量がゼロであるときの電気流体力学ポンプの差圧を測定した。 The method for measuring differential pressure is to supply the target fluid from a transparent water tank to an electrohydrodynamic pump, use a transparent tube as the discharge piping of the electrohydrodynamic pump, and measure the height of the liquid level in the water tank and the liquid level in the discharge piping. The differential pressure generated by the electrohydrodynamic pump was calculated by measuring the height difference between In other words, in this test, we measured the differential pressure of the electrohydrodynamic pump when the flow rate was zero.

この結果、試作例１の電気流体力学ポンプの差圧は３９１ＭＰａ、試作例２の電気流体力学ポンプの差圧は１６１５ＭＰａ、試作例３の電気流体力学ポンプの差圧は１７８０ＭＰａであった。 As a result, the differential pressure of the electrohydrodynamic pump of Prototype Example 1 was 391 MPa, the differential pressure of the electrohydrodynamic pump of Prototype Example 2 was 1615 MPa, and the differential pressure of the electrohydrodynamic pump of Prototype Example 3 was 1780 MPa.

これらの結果から、作用流路を下流側ほど断面積が小さい円錐台状にすることで、電気流体力学ポンプの差圧を大きく向上できることが確認できた。 From these results, it was confirmed that the differential pressure of the electrohydrodynamic pump could be greatly improved by forming the working flow path into a truncated cone shape with a cross-sectional area smaller toward the downstream side.

また、図５に、試作例３の電気流体力学ポンプの差圧の印加電圧に対する関係を示す。図示するように、印加電圧を高くするほどの差圧が直線的に大きくなるため、この電気流体力学ポンプは対象流体の流れを制御する場合に好適であることが分かる。 Further, FIG. 5 shows the relationship between the differential pressure of the electrohydrodynamic pump of Prototype Example 3 and the applied voltage. As shown in the figure, the differential pressure increases linearly as the applied voltage increases, so it can be seen that this electrohydrodynamic pump is suitable for controlling the flow of a target fluid.

１，１Ａ，１Ｂ，１Ｃ 電気流体力学ポンプ
１０，１０Ｂ，１０Ｃ 流路部材
１１，１１Ｂ 作用流路
１２，１２Ｂ，１２Ｃ 隔壁部
１３，１３Ｃ ハウジング部
１４ 吸込取付構造
１５，１５Ｃ 吐出取付構造
１６ 配線部
１７ 吐出流路
２０ 負極
３０ 正極
４０ 吸込保持部材
４１ 吸込流路
４２ 固定構造
４３ 保持構造
４４ 配線孔
５０，５０Ｃ 吐出保持部材
５１ 吐出流路
５２ 固定構造
５３ 保持構造
５４ 配線孔
５５ 保持部
５６ 取付部
５７ 接続部
６０ 吸込キャップ
７０ 吐出キャップ
Ｂ 電池
Ｌ 配線 1, 1A, 1B, 1C Electrohydrodynamic pump 10, 10B, 10C Channel member 11, 11B Working channel 12, 12B, 12C Partition wall section 13, 13C Housing section 14 Suction mounting structure 15, 15C Discharge mounting structure 16 Wiring section 17 Discharge passage 20 Negative electrode 30 Positive electrode 40 Suction holding member 41 Suction passage 42 Fixed structure 43 Holding structure 44 Wiring hole 50, 50C Discharge holding member 51 Discharge passage 52 Fixed structure 53 Holding structure 54 Wiring hole 55 Holding part 56 Mounting part 57 Connection part 60 Suction cap 70 Discharge cap B Battery L Wiring

Claims (5)

絶縁性を有する対象流体に電圧を印加することで前記対象流体に流れを生じさせる電気流体力学ポンプであって、
下流側に向かって断面積が減少する作用流路を有する流路部材と、
前記作用流路の上流側に配設される負極と、
前記作用流路の下流側に配設される正極と、
を備え、
前記作用流路は、前記負極と前記正極の間で断面積が減少する、電気流体力学ポンプ。 An electrohydrodynamic pump that generates a flow in a target fluid by applying a voltage to the target fluid having insulating properties,
a flow path member having a working flow path whose cross-sectional area decreases toward the downstream side;
a negative electrode disposed on the upstream side of the working flow path;
a positive electrode disposed on the downstream side of the working channel;
Equipped with
The working flow path has a reduced cross-sectional area between the negative electrode and the positive electrode. 前記負極及び前記正極の少なくとも一方は、メッシュ状である、請求項１に記載の電気流体力学ポンプ。 The electrohydrodynamic pump according to claim 1, wherein at least one of the negative electrode and the positive electrode has a mesh shape. 前記負極はメッシュ状であり、前記正極はパイプ状又は針状である、請求項１に記載の電気流体力学ポンプ。 The electrohydrodynamic pump according to claim 1, wherein the negative electrode has a mesh shape and the positive electrode has a pipe shape or a needle shape. 前記正極の長手方向は、前記対象流体の流れ方向と平行である、請求項３に記載の電気流体力学ポンプ。 The electrohydrodynamic pump according to claim 3, wherein the longitudinal direction of the positive electrode is parallel to the flow direction of the target fluid. 前記作用流路に前記対象流体を供給する吸込流路を画定すると共に、前記負極を保持する吸込保持部材と、
前記作用流路から流出する前記対象流体を案内する吐出流路を画定すると共に、前記正極を保持する吐出保持部材と、
をさらに備える、請求項１から４のいずれかに記載の電気流体力学ポンプ。 a suction holding member that defines a suction flow path for supplying the target fluid to the working flow path and holds the negative electrode;
a discharge holding member that defines a discharge flow path that guides the target fluid flowing out from the working flow path and holds the positive electrode;
The electrohydrodynamic pump according to any one of claims 1 to 4, further comprising:
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002021814A (en) 2000-07-10 2002-01-23 Fujikura Kasei Co Ltd Actuator
JP2008141870A (en) 2006-12-01 2008-06-19 Kanazawa Inst Of Technology Electrohydrodynamic pump
JP2010063342A (en) 2008-09-07 2010-03-18 Kanazawa Inst Of Technology Electro-hydrodynamic pump and paired electrode unit therefor
JP2014212625A (en) 2013-04-18 2014-11-13 株式会社デンソー EHD pump
JP2019506123A (en) 2016-01-20 2019-02-28 エイピーアール、テクノロジーズ、アクチボラグＡｐｒ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ａｂ Electrohydrodynamic control device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002021814A (en) 2000-07-10 2002-01-23 Fujikura Kasei Co Ltd Actuator
JP2008141870A (en) 2006-12-01 2008-06-19 Kanazawa Inst Of Technology Electrohydrodynamic pump
JP2010063342A (en) 2008-09-07 2010-03-18 Kanazawa Inst Of Technology Electro-hydrodynamic pump and paired electrode unit therefor
JP2014212625A (en) 2013-04-18 2014-11-13 株式会社デンソー EHD pump
JP2019506123A (en) 2016-01-20 2019-02-28 エイピーアール、テクノロジーズ、アクチボラグＡｐｒ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ａｂ Electrohydrodynamic control device

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