JP5756316B2 - Induction electromagnetic pump for molten metal - Google Patents

Induction electromagnetic pump for molten metal Download PDF

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JP5756316B2
JP5756316B2 JP2011073900A JP2011073900A JP5756316B2 JP 5756316 B2 JP5756316 B2 JP 5756316B2 JP 2011073900 A JP2011073900 A JP 2011073900A JP 2011073900 A JP2011073900 A JP 2011073900A JP 5756316 B2 JP5756316 B2 JP 5756316B2
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molten metal
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electromagnetic pump
induction electromagnetic
induction
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JP2012206143A (en
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三浦　邦明
邦明 三浦
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Sukegawa Electric Co Ltd
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Description

本発明は、溶融アルミニウムや溶融亜鉛等の溶融金属を搬送するために使用される溶融金属用誘導電磁ポンプに関し、特に溶融金属を通すダクトの中心にコアを配置せず、ダクトの側壁近くに誘導電流を通すための導体板を設け、ダクト内の溶融金属の推進力の維持と流動抵抗の低減を図った溶融金属用誘導電磁ポンプに関する。   The present invention relates to an induction electromagnetic pump for molten metal used for conveying molten metal such as molten aluminum or molten zinc, and in particular, a core is not disposed at the center of a duct through which molten metal passes, and induction is performed near the side wall of the duct. The present invention relates to an induction electromagnetic pump for molten metal which is provided with a conductor plate for passing an electric current and which maintains the propulsive force of the molten metal in the duct and reduces the flow resistance.

例えば鋳造等の分野では溶融アルミニウムなどを搬送するために、電磁誘導作用により溶融金属に推力を与えて搬送する溶融金属用電磁ポンプが利用されている。このような溶融金属用電磁ポンプは、磁性体製のヨークにコイルを巻いた誘導子により筒状のダクト内部に移動磁界を発生させて溶融金属に推力を与え、供給するる形式の誘導形電磁ポンプが主流である。   For example, in the field of casting or the like, an electromagnetic pump for molten metal is used to convey molten aluminum or the like by applying a thrust to the molten metal by electromagnetic induction. Such an electromagnetic pump for molten metal is an induction type electromagnetic type in which a moving magnetic field is generated inside a cylindrical duct by an inductor having a coil wound around a magnetic yoke, and thrust is applied to the molten metal to be supplied. Pumps are mainstream.

このような誘導形電磁ポンプは、例えば特開２００６−３４１２８１号公報に記載されている。図５は、前述した溶融金属用電磁ポンプの従来例を示すもので、溶融アルミニウムや溶融亜鉛を搬送する一般的なものである。
溶融金属３２を入れた溶融金属槽３１の底部近くの斜めの壁面３３に給湯口が開口しており、この給湯口にフランジ状の継手を介して給湯方向に向けて斜め上向きに真っ直ぐなポンプ側ダクト２１が接続されている。さらにこのポンプ側ダクト２１には、下方に曲げられた給湯側ダクト２１’がフランジ継手等の継手２５、２５’を介して接続されている。この先の給湯側ダクト２１’は、図示してないバネ等により手前のポンプ側ダクト２１に押しつけられ、継手の間に挿入された耐熱性のガスケットによりシール性が確保されている。これらのダクト２１、２１’は、窒化珪素やその他のセラミック等の耐熱性、耐蝕性のある材料で作られており、保温のため外側にヒータ２９が巻かれ、溶融金属３２の融点以上の温度に加熱される。 Such an induction type electromagnetic pump is described in, for example, Japanese Patent Application Laid-Open No. 2006-341281. FIG. 5 shows a conventional example of the above-described electromagnetic pump for molten metal, and is a general one for conveying molten aluminum or molten zinc.
A hot water supply port is opened in an oblique wall surface 33 near the bottom of the molten metal tank 31 containing the molten metal 32, and the pump side is straight and obliquely upward toward the hot water supply direction via a flange-shaped joint. A duct 21 is connected. Further, a hot water supply side duct 21 ′ bent downward is connected to the pump side duct 21 via joints 25 and 25 ′ such as flange joints. The hot water supply side duct 21 'is pressed against the pump side duct 21 by a spring or the like (not shown), and a heat-resistant gasket inserted between the joints ensures sealing performance. These ducts 21, 21 ′ are made of a heat-resistant and corrosion-resistant material such as silicon nitride and other ceramics, and a heater 29 is wound outside to keep the temperature, and the temperature is equal to or higher than the melting point of the molten metal 32. To be heated.

手前のポンプ側ダクト２１の周囲には、磁性体製のヨーク３５にコイル３６を巻回した誘導子３４が配置されている。またこのポンプ側ダクト２１の中には、その中心軸が一致するように磁性体製の円柱体からなるコア２２が配置されている。このコア２２は、両端が閉じられた円筒形の保護管２３の中に収納されており、ポンプ側ダクト２１の中の溶融金属と直接接触しないようになっている。保護管２３は、窒化珪素やその他のセラミック等の耐熱性、耐蝕性のある材料で作られており、その中のコア２２の周囲にクッション材としてアルミナ、マグネシア等のセラミック繊維或いはセラミック粉末等の充填材２８が充填されている。   An inductor 34 in which a coil 36 is wound around a magnetic yoke 35 is disposed around the pump-side duct 21 on the front side. A core 22 made of a magnetic cylinder is disposed in the pump-side duct 21 so that the central axes thereof coincide with each other. The core 22 is housed in a cylindrical protective tube 23 whose both ends are closed, and is not in direct contact with the molten metal in the pump side duct 21. The protective tube 23 is made of a heat-resistant and corrosion-resistant material such as silicon nitride and other ceramics, and ceramic fibers such as alumina and magnesia or ceramic powder as a cushioning material around the core 22 therein. Filler 28 is filled.

保護管２３の給湯側ダクト２１’に近い一端部の周囲にフランジ２６が延設され、このフランジの外周に近い部分が前記ポンプ側ダクト２１と給湯側ダクト２１’とを接続する継手２５、２５’の間に挟持されている。これにより、コア２２がポンプ側ダクト２１の中心に位置するよう保持されている。ポンプ側ダクト２１と給湯側ダクト２１’は、その外周に設けた保温用のマイクロヒータ等からなるヒータ２９により加熱され、溶融金属３２の凝固を防ぐ。保護管２３のフランジ２６には、溶融金属３２の通路となる複数の円弧状の通過孔２７が設けられている。   A flange 26 extends around one end portion of the protective tube 23 near the hot water supply side duct 21 ′, and the joints 25, 25 connect the pump side duct 21 and the hot water supply side duct 21 ′ near the outer periphery of the flange. Is sandwiched between '. Thereby, the core 22 is held so as to be positioned at the center of the pump-side duct 21. The pump side duct 21 and the hot water supply side duct 21 ′ are heated by a heater 29 such as a heat retaining micro heater provided on the outer periphery thereof to prevent the molten metal 32 from solidifying. The flange 26 of the protective tube 23 is provided with a plurality of arc-shaped passage holes 27 that serve as passages for the molten metal 32.

図６は、浸漬形の環状溶融金属用誘導電磁ポンプの従来例である。このタイプの環状溶融金属用誘導電磁ポンプは誘導子３４を窒化珪素やその他のセラミック等の耐熱性及び耐蝕性を有する材料からなる保護ケース３７の中に収納し、ポンプの部分のほぼ全体を溶融金属３２の中に浸漬している。保護ケース３７の下端中央に溶融金属を導入する孔があり、この部分にポンプ側ダクト２１の下端が接合されている。このダクト２１の下端の孔からダクト２１内に溶融金属３２を汲み上げる形式である。保護管２３はフランジ３８によりポンプ側ダクト２１と給湯側ダクト２１’との接続部から誘導子３４の高さまで吊り下げられている。その接続部は縦方向の蓋３９と横方向の蓋４０が図示してないバネで押圧することにより閉じられている。またコア２２は、縦方向の蓋３９から棒４１により誘導子３４の高さまで吊り下げられている。その他、電磁ポンプそのものの構造及びダクト２１、２１’の接続は基本的に図５に示したものと同様であり、同じ部分は同じ符号で示している。その詳細は重複するので説明を省略する。   FIG. 6 shows a conventional example of an immersion type induction electromagnetic pump for annular molten metal. In this type of induction molten electromagnetic pump for molten metal, the inductor 34 is housed in a protective case 37 made of a material having heat resistance and corrosion resistance such as silicon nitride or other ceramics, and almost the entire pump portion is melted. It is immersed in the metal 32. There is a hole for introducing molten metal in the center of the lower end of the protective case 37, and the lower end of the pump side duct 21 is joined to this portion. The molten metal 32 is pumped into the duct 21 from the hole at the lower end of the duct 21. The protective tube 23 is suspended from the connecting portion between the pump side duct 21 and the hot water supply side duct 21 ′ to the height of the inductor 34 by the flange 38. The connecting portion is closed when the vertical lid 39 and the horizontal lid 40 are pressed by a spring (not shown). The core 22 is suspended from the vertical lid 39 to the height of the inductor 34 by a bar 41. In addition, the structure of the electromagnetic pump itself and the connection of the ducts 21 and 21 'are basically the same as those shown in FIG. 5, and the same portions are denoted by the same reference numerals. Since the details overlap, description is omitted.

このような溶融金属用誘導電磁ポンプでは、溶融金属が流れる管状のダクト２１の外周に移動磁界を発生するため、前述のようにヨーク３５にコイル３６を巻いた誘導子３４を配置し、管状のダクト２１の内部に誘導子３４により発生した磁界の磁路となる磁性体のコア２２を配置している。そしてこのコア２２はアルミニウム等の溶融金属による腐蝕を防止する等の必要性から、耐熱性及び耐蝕性を有する筒状の保護管２３により覆っている。従って、溶融金属の流路は管状のダクト２１と保護管２３との間に形成される環状部分のみとなる。それ故、この種の電磁ポンプは環状流路形溶融金属用電磁ポンプと呼ばれている。図５により前述した溶融金属用電磁ポンプの場合、この環状部分の溶融金属３２の流路は、前記保護管２３のフランジ２６の部分でさらに複数の円弧状の通過孔２７の面積に制限される。   In such an induction electromagnetic pump for molten metal, a moving magnetic field is generated on the outer periphery of the tubular duct 21 through which the molten metal flows. Therefore, as described above, the inductor 34 having the coil 36 wound around the yoke 35 is disposed, Inside the duct 21, a magnetic core 22 serving as a magnetic path of a magnetic field generated by the inductor 34 is disposed. The core 22 is covered with a cylindrical protective tube 23 having heat resistance and corrosion resistance in order to prevent corrosion caused by molten metal such as aluminum. Therefore, the flow path of the molten metal is only an annular portion formed between the tubular duct 21 and the protective tube 23. Therefore, this type of electromagnetic pump is called an annular flow channel type molten metal electromagnetic pump. In the case of the molten metal electromagnetic pump described above with reference to FIG. 5, the flow path of the molten metal 32 in the annular portion is further limited to the area of the plurality of arc-shaped passage holes 27 at the flange 26 portion of the protective tube 23. .

このように、従来のコア２２をダクト２１の中心に配置した管状流路形溶融金属用電磁ポンプでは、ダクト２１内の溶融金属３２の流路が制限されて狭くなる。特に図５に前述した形式の管状流路形溶融金属用電磁ポンプでは、保護管２３のフランジ２６の部分における溶融金属３２の流路が複数の円弧状の通過孔２７のみに制限され、流路断面積が著しく狭くなる。このため、溶融金属３２のダクト２１内での流動抵抗が大きく、円滑な流れの妨げとなり、溶融金属３２の供給流量の増大を図ることが出来ない。   Thus, in the tubular flow path type molten metal electromagnetic pump in which the core 22 is arranged at the center of the duct 21, the flow path of the molten metal 32 in the duct 21 is limited and narrowed. In particular, in the tubular flow channel type molten metal electromagnetic pump of the type described above with reference to FIG. 5, the flow channel of the molten metal 32 in the flange 26 portion of the protective tube 23 is limited to only a plurality of arc-shaped passage holes 27. The cross-sectional area becomes extremely narrow. For this reason, the flow resistance of the molten metal 32 in the duct 21 is large, hindering a smooth flow, and the supply flow rate of the molten metal 32 cannot be increased.

特開２００９−０１２０２４号公報JP 2009-012024 A 特開２００９−００６３６４号公報JP 2009-006364 A 特開２００６−３４１２８１号公報JP 2006-341281 A 特開平０７−２０４８２９号公報Japanese Patent Application Laid-Open No. 07-204829

本発明は、前記従来の溶融金属用誘導電磁ポンプにおける課題に鑑み、ダクトの流路が大きく制限されず、溶融金属が通る流路断面積を広くとることが出来、これにより溶融金属の流動抵抗が小さく、効率良く溶融金属を搬送することが出来る溶融金属用誘導電磁ポンプを提供することを目的とする。   In the present invention, in view of the problems in the conventional molten metal induction electromagnetic pump, the flow path of the duct is not greatly limited, and the flow path cross-sectional area through which the molten metal passes can be widened. An object of the present invention is to provide an induction electromagnetic pump for molten metal that is small in size and can efficiently convey molten metal.

本発明では、前記の目的を達成するため、溶融金属を通すダクトの中心にコアを配置せず、ダクト内の流動抵抗の低減を図り、しかも誘導子で発生した移動磁界により誘導される誘導電流をダクトの溶融金属の流れの方向に沿って通すことが出来るように、ダクトの側壁近くに誘導電流を通すための導体板を設けた。   In the present invention, in order to achieve the above object, the core is not disposed at the center of the duct through which the molten metal passes, the flow resistance in the duct is reduced, and the induced current induced by the moving magnetic field generated by the inductor A conductor plate for passing an induced current is provided near the side wall of the duct.

すなわち、本発明による溶融金属用誘導電磁ポンプは、溶融金属を通すダクト１と、このダクト１の中に移動磁界を発生させる誘導子７とを有する溶融金属用誘導電磁ポンプであって、ダクト１内にコアを配置せず、誘導電流を流す導電性セラミックからなる導体板２を、前記ダクト１内の誘導子７を設けた位置に対応して設けたものである。 In other words, the induction electromagnetic pump for molten metal according to the present invention is an induction electromagnetic pump for molten metal having a duct 1 for passing molten metal and an inductor 7 for generating a moving magnetic field in the duct 1. A conductor plate 2 made of a conductive ceramic that does not have a core disposed therein and allows an induced current to flow therethrough is provided corresponding to the position where the inductor 7 is provided in the duct 1 .

例えば、ダクト１は断面がほぼ矩形とし、その対向する一対の側壁に近接して導体板２、２を設ける。誘導子７、７は、ダクト１の対向する他方の一対の側壁に隣接してその外側に配置する。導体板２、２は、円筒形の導電性セラミックを縦に分割した如き形状のセグメント状の部分円筒形のものを使用する。この導体板２、２を、ダクト１の対向する一対の側壁の内側に近接して配置し、耐熱性接着剤９、９によりダクト１の側壁に固定して取り付ける。   For example, the duct 1 has a substantially rectangular cross section, and the conductor plates 2 and 2 are provided close to a pair of opposing side walls. The inductors 7 and 7 are disposed adjacent to the other pair of opposite side walls of the duct 1 and outside thereof. As the conductor plates 2 and 2, segmented partial cylinders having a shape obtained by vertically dividing a cylindrical conductive ceramic are used. The conductor plates 2 and 2 are arranged close to the inside of the pair of opposing side walls of the duct 1 and fixed to the side walls of the duct 1 with heat-resistant adhesives 9 and 9.

このような溶融金属用誘導電磁ポンプでは、コアをダクト１の中心に配置する必要が無いので、ダクト１内での溶融金属の流路が制限されず、ダクト１内を広く利用して溶融金属の搬送を行うことが出来る。従って、溶融金属の流動抵抗を小さく抑えることが出来る。また、ダクト１は耐熱性、耐腐食性等に観点から、窒化珪素（Ｓｉ３Ｎ４）やチッ化珪素にアルミナ（Ａｌ２Ｏ３）とシリカ（ＳｉＯ２）を合成して得られるチッ化珪素系セラミックス（商品名「サイアロン」）等の絶縁体で作られるため、誘導電流が流れず、溶融金属の推進力小さくなってしまう。これに対し、ダクト１の側壁の溶融金属の流れの方向に沿って誘導電流を流す導電性セラミックからなる導体板２、２を設けることにより、この導体板２、２を介して誘導電流が流れるため、誘導子７により溶融金属の推進力を低減することなく、誘導子７の電磁誘導による溶融金属の推進力を有効に作用させることも出来る。 In such an induction electromagnetic pump for molten metal, since it is not necessary to arrange the core at the center of the duct 1, the flow path of the molten metal in the duct 1 is not limited, and the molten metal is widely used in the duct 1. Can be carried. Therefore, the flow resistance of the molten metal can be kept small. The duct 1 is obtained by synthesizing alumina (Al 2 O 3 ) and silica (SiO 2 ) with silicon nitride (Si 3 N 4 ) or silicon nitride from the viewpoint of heat resistance, corrosion resistance, and the like. Since it is made of an insulator such as silicon-based ceramics (trade name “Sialon”), the induced current does not flow and the propulsive force of the molten metal is reduced. On the other hand, by providing the conductor plates 2 and 2 made of conductive ceramics that cause the induced current to flow along the flow direction of the molten metal on the side wall of the duct 1, the induced current flows through the conductor plates 2 and 2. Therefore, the propulsion force of the molten metal due to the electromagnetic induction of the inductor 7 can be effectively applied without reducing the propulsion force of the molten metal by the inductor 7.

以上のように、本発明によれば、コアをダクト１の中心に配置する必要が無いので、ダクト１内を広く利用して溶融金属の搬送を行うことが出来、溶融金属の流動抵抗を小さくすることが出来る。また、ダクト１内の側壁に隣接して設けた導体板２、２を介して誘導電流が流れるため、誘導子７による溶融金属の推進力を有効に作用させることも出来る。従って、効率の良い溶融金属の搬送が可能となる。   As described above, according to the present invention, since it is not necessary to arrange the core at the center of the duct 1, the inside of the duct 1 can be widely used to transport the molten metal, and the flow resistance of the molten metal can be reduced. I can do it. In addition, since an induced current flows through the conductor plates 2 and 2 provided adjacent to the side wall in the duct 1, the propulsion force of the molten metal by the inductor 7 can be effectively applied. Therefore, it is possible to efficiently convey the molten metal.

溶融金属用誘導電磁ポンプの一実施例を示す縦断側面図である。It is a vertical side view which shows one Example of the induction | guidance | derivation electromagnetic pump for molten metals. 図１のＡ−Ａ線断面図である、It is the sectional view on the AA line of FIG. 図２にダクト部分を示す要部拡大断面図である。It is a principal part expanded sectional view which shows a duct part in FIG. 溶融金属用誘導電磁ポンプの一使用例を示す縦断側面図である。It is a vertical side view which shows one use example of the induction | guidance | derivation electromagnetic pump for molten metals. 溶融金属用誘導電磁ポンプの従来例を示す縦断側面図である。It is a vertical side view which shows the prior art example of the induction | guidance | derivation electromagnetic pump for molten metals. 溶融金属用誘導電磁ポンプの他の従来例を示す縦断側面図である。It is a vertical side view which shows the other conventional example of the induction | guidance | derivation electromagnetic pump for molten metals.

本発明では、前記の目的を達成するため、溶融金属を通すダクトの中心にコアを配置せず、しかも誘導子で発生した移動磁界により誘導される誘導電流をダクトの溶融金属の流れの方向に沿って通すための導体をダクト内の側壁近傍に配置した。
以下、本発明を実施するための最良の形態について、実施例をあげて詳細に説明する。 In the present invention, in order to achieve the above object, the core is not disposed at the center of the duct through which the molten metal passes, and the induced current induced by the moving magnetic field generated by the inductor is directed in the direction of the molten metal flow in the duct. The conductor for passing along was arrange | positioned in the side wall vicinity in a duct.
Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

図１〜図３は、本発明の一実施例による溶融金属用誘導電磁ポンプを示している。これらの図に示すように、ダクト１は窒化珪素（Ｓｉ３Ｎ４）やチッ化珪素にアルミナ（Ａｌ２Ｏ３）とシリカ（ＳｉＯ２）を合成して得られるチッ化珪素系セラミックス（商品名「サイアロン」）等の絶縁体で作られる。その断面は矩形である。図１と図２に示すように、このダクト１の外側は外筒５で覆われている。 1 to 3 show an induction electromagnetic pump for molten metal according to an embodiment of the present invention. As shown in these figures, the duct 1 is composed of silicon nitride ceramics (commodity) obtained by synthesizing alumina (Al 2 O 3 ) and silica (SiO 2 ) with silicon nitride (Si 3 N 4 ) or silicon nitride. Made of insulators such as the name “Sialon”). Its cross section is rectangular. As shown in FIGS. 1 and 2, the outside of the duct 1 is covered with an outer cylinder 5.

図１〜図３に明らかな通り、ダクト１内にはコアが配置されていない。このダクト１の対向する一対の内壁面の近傍に導電性セラミックからなる導体板２、２が対向して設けられている。この導体板２、２は少なくとも後述する誘導子７の全長にわたって設けられている。導電板２、２は、導電性セラミックからなる円筒体を縦に複数に分割した如き形状、すなわち導電性セラミックからなる円筒体のセグメント形を有しており、断面円弧状に湾曲した長尺な部材からなる。
 As is apparent from FIGS. 1 to 3, no core is disposed in the duct 1. Conductor plate 2, 2 formed of a conductive ceramic is provided opposite to the vicinity of the pair of inner wall surfaces facing in the duct 1. The conductor plates 2 and 2 are provided over at least the entire length of an inductor 7 described later. The conductive plates 2 and 2 have a shape in which a cylindrical body made of a conductive ceramic is divided into a plurality of lengths, that is, a segment shape of a cylindrical body made of a conductive ceramic, and are long and curved in an arcuate cross section. It consists of members.

図３に示すように、ダクト１の対向する一対の壁面の両側に窪み１０、１０が設けられている。前記導電板２、２を突面側が互いに対向するように前記ダクト１の両内側壁に近接して配置すると共に、同導電板２、２の両側辺を前記ダクト１の対向する一対の壁面の両側に設けた窪み１０、１０に嵌め込んでいる。さらに導電板２、２の凹面側とダクト１の両内側壁面との間に耐熱性接着剤９、９を充填し、これを硬化させて導電板２、２をダクト１の両内側壁面に固定している。   As shown in FIG. 3, depressions 10 and 10 are provided on both sides of a pair of opposing wall surfaces of the duct 1. The conductive plates 2, 2 are arranged close to both inner side walls of the duct 1 so that the projecting surfaces face each other, and both sides of the conductive plates 2, 2 are formed on a pair of opposing wall surfaces of the duct 1. It fits into the depressions 10 and 10 provided on both sides. Further, heat-resistant adhesives 9 and 9 are filled between the concave side of the conductive plates 2 and 2 and both inner wall surfaces of the duct 1, and are cured to fix the conductive plates 2 and 2 to both inner wall surfaces of the duct 1. doing.

図１と図２に示すように、ダクト１及びその外筒５の外側には、前記導体板２、２が対向している方向と直交する方向に対向して一対の誘導子７、７が設けられている。これらの誘導子７、７は、前記外筒５に固定した積層鉄芯からなるヨーク３、３と、このヨーク３、３にそれぞれ巻回されたコイル４、４…とからなる。このコイル４、４…は三相交流を順次流すもので、３の倍数個巻回されている。図示の例では、３×２＝６個のコイル４、４…が巻回されている。このコイル４、４…はコイルホルダ８、８…により固定され、このコイルホルダ８、８…の両端は前記外筒５の両端に固定した側板６、６に固定して支持されている。   As shown in FIGS. 1 and 2, a pair of inductors 7 and 7 are arranged on the outside of the duct 1 and its outer cylinder 5 so as to face each other in a direction orthogonal to the direction in which the conductor plates 2 and 2 face each other. Is provided. These inductors 7, 7 are composed of yokes 3, 3 made of laminated iron cores fixed to the outer cylinder 5, and coils 4, 4... Wound around the yokes 3, 3, respectively. These coils 4, 4... Sequentially pass three-phase alternating current, and are wound in multiples of three. In the illustrated example, 3 × 2 = 6 coils 4, 4... Are wound. These coils 4 are fixed by coil holders 8, and both ends of the coil holders 8 are fixedly supported on side plates 6 fixed to both ends of the outer cylinder 5.

このような溶融金属用誘導電磁ポンプでは、誘導子７、７のコイル４、４…に三相交流を通電することにより、誘導子７、７にダクト１の長手方向、すなわち図１において左または右方向に移動する磁界を発生させる。この磁界は図１と図２においてダクト１を上下に通過するように発生する。これにより、ダクト１内の溶融金属には、図２において右方向（または左方向）に誘導電流が誘導される。これにより、フィレミング左手の法則に従ってダクト１内の溶融金属に図１において左右の何れかの方向に推進力が発生する。   In such an induction electromagnetic pump for molten metal, by passing a three-phase alternating current through the coils 4, 4... Of the inductors 7, 7, the inductors 7, 7 are placed in the longitudinal direction of the duct 1, that is, left or left in FIG. Generate a magnetic field that moves to the right. This magnetic field is generated so as to pass up and down the duct 1 in FIGS. Thus, an induced current is induced in the molten metal in the duct 1 in the right direction (or left direction) in FIG. Accordingly, a propulsive force is generated in the left or right direction in FIG.

このとき、導電板２、２が無いと、移動磁界に誘導されたダクト１内にある溶融金属に発生する誘導電流は、ダクト１の両側でその中の溶融金属を図２において上下方向に流れる。このため、ダクトの両側では、その分だけ溶融金属の推進力が減殺されることになる。これに対して前記のように、ダクト１の両側に導体板２、２が設けられていると、ダクト１の両側で電流は導体板２、２を通って図２において上下方向に流れる。このため、溶融金属には推進力の減殺が起こらない。従って、ダクト１の全断面積にわたって溶融金属に効率的に推進力を作用させることが出来る。しかも、ダクト１の中にコアが無いので、導体板２、２が対向する幅いっぱいにダクト１の断面積を有効に利用することが出来る。   At this time, if the conductive plates 2 and 2 are not provided, the induced current generated in the molten metal in the duct 1 induced by the moving magnetic field flows through the molten metal in both sides of the duct 1 in the vertical direction in FIG. . For this reason, on both sides of the duct, the propulsive force of the molten metal is reduced accordingly. On the other hand, as described above, when the conductor plates 2 and 2 are provided on both sides of the duct 1, current flows on the both sides of the duct 1 in the vertical direction in FIG. 2 through the conductor plates 2 and 2. For this reason, the propulsion of the molten metal is not reduced. Therefore, a propulsive force can be efficiently applied to the molten metal over the entire cross-sectional area of the duct 1. In addition, since there is no core in the duct 1, the cross-sectional area of the duct 1 can be used effectively to the full width where the conductor plates 2 and 2 face each other.

図４は、前述の溶融金属用誘導電磁ポンプの使用例を示す。溶融金属用誘導電磁ポンプは、窒化珪素等のセラミックからなる耐熱性、耐腐食性を有する保護ケース１１の中に収納している。さらにヨーク３、３及びコイル４、４…と保護ケース１１との間にマグネシア（ＭｇＯ）、アルミナ（Ａｌ２Ｏ３）の粉末或いは繊維等からなる伝熱充填材１２を充填し、溶融金属用誘導電磁ポンプを保護ケース１１の中に固定している。保護ケース１１の上面開口部は、やはり前記保護ケース１１と同様の窒化珪素等からなる耐熱性、耐腐食性を有する蓋体１８を被せ、この蓋体１８の中心からダクト１の上端を保護ケース１１に外側に突出させる。 FIG. 4 shows an example of use of the above-described induction electromagnetic pump for molten metal. The molten metal induction electromagnetic pump is housed in a protective case 11 made of ceramic such as silicon nitride and having heat resistance and corrosion resistance. Further, the heat transfer filler 12 made of magnesia (MgO), alumina (Al 2 O 3 ) powder or fiber is filled between the yokes 3 and 3 and the coils 4, 4. An induction electromagnetic pump is fixed in the protective case 11. The upper surface opening of the protective case 11 is covered with a heat-resistant and corrosion-resistant cover 18 made of silicon nitride, which is the same as the protective case 11, and the upper end of the duct 1 is protected from the center of the cover 18. 11 to protrude outward.

このダクト１の上端には、継手１７を介して溶融金属搬送用のダクト１３に接続し、さらにこのダクト１５を溶融金属搬送用のダクト１４に接続している。これら溶融金属搬送用のダクト１３、１４にヒータ１５、１６を設け、これらダクト１３、１４を溶融金属の融点以上の温度に保持する。   The upper end of the duct 1 is connected to a molten metal transport duct 13 via a joint 17, and the duct 15 is further connected to a molten metal transport duct 14. Heaters 15 and 16 are provided in the ducts 13 and 14 for conveying the molten metal, and the ducts 13 and 14 are maintained at a temperature equal to or higher than the melting point of the molten metal.

このような溶融金属用誘導電磁ポンプは、前記保護ケース１１に覆われた部分を溶融金属槽の中の溶融金属に浸漬し、ダクト１の中に溶融金属を導入させる。この状態で、コイル４、４…に三相交流を通電し、ダクト１の中の溶融金属に推力を与えて汲み上げ、ダクト１３、１４で所要の個所に溶融金属を搬送する。
なお、前述した溶融金属用誘導電磁ポンプは、このような溶融金属に電磁ポンプの駆動部分を浸漬して使用する、いわゆる浸漬形に限らず、図５により前述した非浸漬形の溶融金属用誘導電磁ポンプとしても使用出来ることは言うまでも無い。 In such an induction electromagnetic pump for molten metal, the portion covered with the protective case 11 is immersed in the molten metal in the molten metal tank, and the molten metal is introduced into the duct 1. In this state, a three-phase alternating current is applied to the coils 4, 4..., A thrust is applied to the molten metal in the duct 1 to pump it up, and the molten metal is transported to a required location by the ducts 13 and 14.
The above-described induction electromagnetic pump for molten metal is not limited to the so-called immersion type in which the drive portion of the electromagnetic pump is immersed in such molten metal, but the non-immersion type induction for molten metal described above with reference to FIG. Needless to say, it can also be used as an electromagnetic pump.

本発明による溶融金属用誘導電磁ポンプは、例えば砂型鋳造法、低圧鋳造法、ダイキャスト鋳造法等の手段により、鋳型のキャビティ内に溶融アルミニウム等の溶融金属を供給して鋳物を鋳造するに当たり、鋳型のキャビティ内に溶融アルミニウム等の溶融金属を供給する溶融金属の搬送手段として利用することが出来る。   The induction electromagnetic pump for molten metal according to the present invention, for example, by casting a casting by supplying molten metal such as molten aluminum into a mold cavity by means of sand casting, low pressure casting, die casting, etc. It can be used as a molten metal conveying means for supplying molten metal such as molten aluminum into the mold cavity.

１ ダクト
２ 導電板
３ 誘導子のヨーク
４ 誘導子のコイル
７ 誘導子
９ 接着剤 1 Duct 2 Conductive plate 3 Inductor yoke 4 Inductor coil 7 Inductor 9 Adhesive

Claims (5)

溶融金属を通すダクト（１）と、このダクト（１）の中に移動磁界を発生させる誘導子（７）とを有する溶融金属用誘導電磁ポンプにおいて、ダクト（１）内にコアを配置せず、誘導電流を流す導電性セラミックからなる導体板（２）を、前記ダクト（１）内の誘導子（７）を設けた位置に対応して設けたことを特徴とする溶融金属用誘導電磁ポンプ。 In an induction electromagnetic pump for molten metal having a duct (1) for passing molten metal and an inductor (7) for generating a moving magnetic field in the duct (1), a core is not disposed in the duct (1). An induction electromagnetic pump for molten metal, characterized in that a conductive plate (2) made of a conductive ceramic for passing an induction current is provided in correspondence with the position of the inductor (7) in the duct (1). . ダクト（１）は断面がほぼ矩形とし、その対向する一対の側壁に近接して導体板（２）を設けたことを特徴とする請求項１に記載の溶融金属用誘導電磁ポンプ。 The induction electromagnetic pump for molten metal according to claim 1, wherein the duct (1) has a substantially rectangular cross section, and a conductor plate (2) is provided in the vicinity of a pair of opposing side walls. 誘導子（７）は、ダクト（１）の対向する他方の一対の側壁に隣接してその外側に配置したことを特徴とする請求項２に記載の溶融金属用誘導電磁ポンプ。 3. The induction electromagnetic pump for molten metal according to claim 2 , wherein the inductor (7) is arranged adjacent to the other pair of opposite side walls of the duct (1) and outside thereof. 導体板（２）は、円筒形の導電性セラミックを縦に分割した如き形状のセグメント状の部分円筒形のものからなることを特徴とする請求項１〜３の何れかに記載の溶融金属用誘導電磁ポンプ。 The molten metal according to any one of claims 1 to 3, wherein the conductive plate (2) is made of a segmented partial cylindrical shape having a shape obtained by vertically dividing a cylindrical conductive ceramic. Induction electromagnetic pump. 導体板（２）を、ダクト（１）の対向する一対の側壁の内側に近接して配置し、耐熱性接着剤（９）によりダクト（１）の側壁に固定して取り付けたことを特徴とする請求項１〜４の何れかに記載の溶融金属用誘導電磁ポンプ。 The conductor plate (2) is disposed close to the inside of a pair of opposing side walls of the duct (1), and fixed to the side wall of the duct (1) with a heat resistant adhesive (9). An induction electromagnetic pump for molten metal according to any one of claims 1 to 4.
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DE3409773A1 (en) * 1984-03-16 1985-09-19 INTERATOM GmbH, 5060 Bergisch Gladbach ELECTROMAGNETIC STIRRING PUMP FOR LIQUID METALS
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JPS63274357A (en) * 1987-04-30 1988-11-11 Shinko Electric Co Ltd Electromagnetic pump
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