JP2010168601A - Dipping tube - Google Patents

Dipping tube Download PDF

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JP2010168601A
JP2010168601A JP2009009830A JP2009009830A JP2010168601A JP 2010168601 A JP2010168601 A JP 2010168601A JP 2009009830 A JP2009009830 A JP 2009009830A JP 2009009830 A JP2009009830 A JP 2009009830A JP 2010168601 A JP2010168601 A JP 2010168601A
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tip
core tube
stud
tube
refractory material
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Kimihiro Yasui
公宏 安井
Toshiichi Terajima
敏一 寺島
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TYK Corp
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TYK Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a dipping tube capable of suppressing cracking of refractory materials. <P>SOLUTION: The dipping tube 4 includes: a cylindrical core tube 40 which is made of a heat-resistant metal and has studs 43 and 44 provided on its surface; and refractory materials 42 and 43 which are located inside, outside and at the tip of the core tube 40, wherein the studs 43 and 44 are embedded in the refractory materials. The tip of the dipping tube 4 is dipped into molten metal. Tip studs 44 are provided at the tip of the core tube 40, wherein each tip stud includes a body part 441 extending inward in the radial direction and a widened tip part 442 provided on the tip of the body part 441. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、先端が金属溶湯に浸漬される浸漬管に関する。   The present invention relates to a dip tube whose tip is immersed in a molten metal.

従来より、溶鋼などの金属溶湯を真空室に吸引することにより、溶鋼などの金属溶湯を脱ガス処理する真空脱ガス装置が提供されている。   2. Description of the Related Art Conventionally, a vacuum degassing apparatus that degass a molten metal such as molten steel by sucking the molten metal such as molten steel into a vacuum chamber has been provided.

真空脱ガス装置は、真空室を形成する炉体と、炉体の下部に２個並設された浸漬管と、各浸漬管の上部に配置された環流管と、を備えている。溶鋼等の金属溶湯を脱ガス処理するときには、取鍋の溶鋼などの金属溶湯に各浸漬管の下部を浸漬させた状態で、一方の浸漬管及び環流管を経て、溶鋼などの金属溶湯を真空室に吸引して脱ガスする。脱ガスされた溶鋼などの金属溶湯は、他方の環流管及び浸漬管を経て取鍋に戻る。   The vacuum degassing apparatus includes a furnace body forming a vacuum chamber, two dip pipes arranged in parallel at the lower part of the furnace body, and a reflux pipe arranged at the upper part of each dip pipe. When degassing a molten metal such as molten steel, the lower part of each dip tube is immersed in the molten metal such as molten steel in the ladle, and the molten metal such as molten steel is vacuumed through one dip tube and a reflux tube. Degas by suction into the chamber. The degassed molten metal such as molten steel returns to the ladle through the other reflux pipe and dip pipe.

そして、浸漬管は、筒状の芯管と芯管の内側及び外側に一体的に形成された耐火材とをもつように形成されている。耐火材を芯管に固定するために、芯管の外周には、線材をＶ字状やＹ字状等の形状に成形したスタッドが溶接され、耐火材がこのスタッドを内包するように形成されている。このような構成となることで、耐火材がスタッドに係止され、耐火材が固定される。   The dip tube is formed to have a cylindrical core tube and a refractory material integrally formed on the inside and outside of the core tube. In order to fix the refractory material to the core tube, the outer periphery of the core tube is welded with a stud formed by forming a wire into a V shape or Y shape, and the refractory material is formed so as to enclose the stud. ing. With this configuration, the refractory material is locked to the stud, and the refractory material is fixed.

また、浸漬管において、耐火材を係合するスタッドは、芯管の先端にも接合されている。従来の浸漬管においては、芯管の先端部に、Ｖ字状のスタッドが、Ｖ字が開く向きで接合されている。   Further, in the dip tube, the stud that engages the refractory material is also joined to the tip of the core tube. In a conventional dip tube, a V-shaped stud is joined to the tip of the core tube in a direction in which the V shape opens.

この浸漬管は、金属溶湯にその先端部が浸漬されて内部を金属溶湯が流れることが繰り返されると、浸漬管の外表面を形成する耐火材に亀裂が発生するという問題が発生していた。   When the tip of the dip tube is immersed in the molten metal and the molten metal is repeatedly flown inside, there is a problem that a crack occurs in the refractory material forming the outer surface of the dip tube.

特に、浸漬管を金属溶湯に浸漬すると、金属溶湯からの熱により、筒状の芯管の先端が開く方向に変形（熱膨張）を生じる。この芯管の先端の拡径により、芯管の先端において、耐火材の亀裂や脱落が発生しやすくなっていた。   In particular, when the dip tube is immersed in the molten metal, the heat from the molten metal causes deformation (thermal expansion) in the direction in which the tip of the cylindrical core tube opens. Due to the diameter expansion of the tip of the core tube, the refractory material is easily cracked or dropped off at the tip of the core tube.

本発明は上記実状に鑑みてなされたものであり、先端における耐火材の亀裂の発生が抑えられた浸漬管を提供することを課題とする。   This invention is made | formed in view of the said actual condition, and makes it a subject to provide the dip tube by which generation | occurrence | production of the crack of the refractory material in the front-end | tip was suppressed.

上記課題を解決するために本発明者等は、耐火材の亀裂の発生が、芯管の先端が開く方向に変形することに由来することに着目し、本発明をなすに到った。   In order to solve the above problems, the present inventors have made the present invention by paying attention to the fact that the occurrence of cracks in the refractory material is caused by deformation in the direction in which the tip of the core tube opens.

すなわち、本発明の浸漬管は、表面にスタッドがもうけられた耐熱性金属よりなる筒状の芯管と、スタッドを内包した状態で、芯管の内側，外側及び先端に配置される耐火材と、を有し、先端が溶湯に浸漬される浸漬管であって、芯管の先端には、径方向内方に向かって伸びる本体部と、本体部の先端にもうけられた拡幅した先端部と、を備えた先端スタッドを有することを特徴とする。   That is, the dip tube of the present invention includes a cylindrical core tube made of a heat-resistant metal with a stud provided on the surface, and a refractory material disposed on the inside, outside, and tip of the core tube with the stud included. The tip of the core tube is immersed in the molten metal, and at the tip of the core tube, a main body portion extending radially inward, and a widened tip portion provided at the tip of the main body portion, And a tip stud provided with.

本発明の浸漬管は、耐火材を芯管に固定するスタッドのうち、芯管の先端にもうけられる先端スタッドを、径方向内方に向かって伸びる本体部と、本体部の先端にもうけられた拡幅した先端部と、を備えたものとしている。すなわち、先端スタッドが、径方向内方側が拡幅した形状であるため、芯管の先端が開く方向（拡径する方向）に変形を生じようとしても、この先端スタッドにより芯管の変形が規制される。この結果、芯管が熱膨張したときに耐火材に加える応力が小さくなり、耐火材に亀裂が発生する不具合が発生しにくくなる。   In the dip tube of the present invention, among the studs for fixing the refractory material to the core tube, the tip stud provided at the tip of the core tube is provided at the body portion extending radially inward and at the tip of the body portion. And a widened tip. That is, since the tip stud has a shape in which the radially inner side is widened, even if the tip stud is deformed in the opening direction (diameter expanding direction), deformation of the core tube is regulated by the tip stud. The As a result, the stress applied to the refractory material when the core tube is thermally expanded is reduced, and it is difficult for a problem that a crack occurs in the refractory material.

実施例の真空脱ガス装置の構成を示した図である。It is the figure which showed the structure of the vacuum degassing apparatus of an Example. 浸漬管の構成を示した図である。It is the figure which showed the structure of the dip tube.

本発明の浸漬管は、表面にスタッドがもうけられた耐熱性金属よりなる筒状の芯管と、スタッドを内包した状態で、芯管の内側，外側及び先端に配置される耐火材と、を有し、先端が溶湯に浸漬される浸漬管である。   The dip tube of the present invention comprises a cylindrical core tube made of a heat-resistant metal with a stud provided on the surface, and a refractory material disposed on the inside, outside, and tip of the core tube in a state of including the stud. A dip tube having a tip immersed in the molten metal.

本発明の浸漬管における芯管は、鋼や合金鋼等の従来公知の耐熱性金属で構成される筒状（管状）の部材である。また、一般的な芯管の断面形状は略円形であるが、特にこれに限定されるものではなく、楕円形等であってもよい。   The core tube in the dip tube of the present invention is a tubular (tubular) member made of a conventionally known heat-resistant metal such as steel or alloy steel. Moreover, although the cross-sectional shape of a general core tube is substantially circular, it is not particularly limited to this, and may be elliptical or the like.

本発明の浸漬管における耐火材は、スタッドを内包した状態で、芯管の内側，外側及び先端に配置される部材であり、浸漬管が浸漬した溶湯及び浸漬管内を流れる溶湯からの熱が直接芯管に流れることを防止する部材である。耐火材としては、従来公知の耐火材を用いることができ、例えば、マグネシア−クロム質、マグネシア−カーボン質、アルミナ−クロム質、アルミナ−カーボン質、アルミナ−マグネシア質、アルミナ−マグネシア−カーボン質、アルミナ−スピネル−カーボン質等の耐火材料を使用することができる。   The refractory material in the dip tube of the present invention is a member disposed on the inner side, the outer side, and the tip of the core tube in a state of including the stud, and heat from the molten metal immersed in the dip tube and the molten metal flowing in the dip tube is directly applied. It is a member that prevents it from flowing into the core tube. As the refractory material, a conventionally known refractory material can be used, for example, magnesia-chromium, magnesia-carbon, alumina-chromium, alumina-carbon, alumina-magnesia, alumina-magnesia-carbon, Refractory materials such as alumina-spinel-carbon can be used.

そして、本発明の浸漬管は、芯管の先端に、径方向内方に向かって伸びる本体部と、本体部の先端にもうけられた拡幅した先端部と、を備えた先端スタッドを有する。この先端スタッドにより、溶湯からの熱が芯管に伝わって、芯管の先端が開く方向（拡径する方向）に変形しようとしても、内径側が拡幅した先端スタッドの形状により、変形が抑えられる。この結果、芯管が熱膨張したときに耐火材に加える応力が小さくなり、耐火材に亀裂が発生する不具合が発生しにくくなる。   And the dip tube of this invention has a front-end | tip stud provided with the main-body part extended toward radial direction inward at the front-end | tip of a core pipe, and the widened front-end | tip part provided at the front-end | tip of a main-body part. Even if the tip stud transfers the heat from the molten metal to the core tube and tries to deform it in the direction in which the tip of the core tube opens (in the direction of expanding the diameter), the shape of the tip stud with the expanded inner diameter side suppresses the deformation. As a result, the stress applied to the refractory material when the core tube is thermally expanded is reduced, and it is difficult for a problem that a crack occurs in the refractory material.

具体的には、先端スタッドは、内径側が拡幅した形状に形成されている。そして、先端スタッドが耐火材に内包されていることから、先端スタッドの先端部は耐火材に埋まった状態となっている。そして、芯管の先端が開く方向に変形しようとすると、先端スタッドも、径方向外方に変移しようとする。しかし、先端スタッドの拡幅した先端部が耐火材に埋まった状態であるため、耐火材により先端部の変移が規制される。先端スタッドの先端部の径方向外方への変移が規制されることから、先端スタッド自身の変移が規制され、この結果、芯管の先端が変形することが規制される。この結果、芯管の熱膨張による変形が抑えられ、芯管が耐火材に加える応力が小さくなり、耐火材に亀裂が発生する不具合が発生しにくくなる。   Specifically, the tip stud is formed in a shape whose inner diameter side is widened. And since the tip stud is included in the refractory material, the tip portion of the tip stud is buried in the refractory material. When the tip of the core tube is deformed in the opening direction, the tip stud also tries to shift radially outward. However, since the widened tip portion of the tip stud is buried in the refractory material, the transition of the tip portion is regulated by the refractory material. Since the displacement of the distal end portion of the distal stud in the radially outward direction is restricted, the displacement of the distal stud itself is restricted, and as a result, the deformation of the distal end of the core tube is restricted. As a result, deformation due to thermal expansion of the core tube is suppressed, the stress applied to the refractory material by the core tube is reduced, and a problem that a crack occurs in the refractory material is less likely to occur.

先端スタッドは、芯管の外周面又は内周面に接合された軸方向にのびる接合部と、接合部の先端にもうけられ径方向内方に向かってのびる本体部と、本体部の先端にもうけられた先端部と、を有することが好ましい。先端スタッドがこのような形状をなすことで、先端スタッドによる芯管の先端の変形が抑えられる。   The tip stud is connected to the outer peripheral surface or inner peripheral surface of the core tube, extending in the axial direction, the main body extending toward the inner end of the connecting portion, and extending radially inward. It is preferable to have a tip portion formed. When the tip stud has such a shape, deformation of the tip of the core tube due to the tip stud is suppressed.

先端スタッドの本体部は、径方向内方に向かってのびるときに、軸方向の位置が変化してもよいが、製造の容易さ等の理由から軸方向に垂直な方向に沿ってのびることが好ましい。   When the body part of the tip stud extends inward in the radial direction, the position in the axial direction may change, but for reasons such as ease of manufacture, it may extend along the direction perpendicular to the axial direction. preferable.

先端スタッドの数は、３カ所以上であれば特に限定されるものではなく、その配置は芯管の周方向における間隔が均一となるようにもうけることが好ましい。複数の先端スタッドを周方向に均一にもうけることで、芯管の先端が開く方向に変形するときの応力が偏らなくなる。   The number of tip studs is not particularly limited as long as it is three or more, and the arrangement is preferably provided so that the intervals in the circumferential direction of the core tube are uniform. By providing a plurality of end studs uniformly in the circumferential direction, stress when the tip end of the core tube is deformed to open is not biased.

芯管の先端と本体部の距離が異なる複数の先端スタッドを有することが好ましい。すなわち、浸漬管が、芯管の先端から本体部までの距離が異なる複数の先端スタッドを有することで、先端スタッドが耐火材に応力を加える軸方向位置が偏らなくなり、浸漬管の先端での耐火材の損傷が抑えられる。   It is preferable to have a plurality of tip studs with different distances between the tip of the core tube and the main body. That is, since the dip tube has a plurality of tip studs with different distances from the tip of the core tube to the main body, the axial position where the tip stud applies stress to the refractory material is not biased, and the refractory at the tip of the dip tube Damage to the material is suppressed.

本発明の浸漬管は、芯管の先端に先端スタッドを備えた構成となっていれば、それ以外の構成は、従来公知の浸漬管と同様の構成とすることができる。   As long as the dip tube of the present invention has a configuration in which a tip stud is provided at the tip of the core tube, the other configuration can be the same as that of a conventionally known dip tube.

芯管は、特に限定されるものではなく、二重管であっても、内周と外周の少なくとも一方に定型耐火物を一部あるいは全部用いる場合であっても、いずれの構成であってもよい。   The core tube is not particularly limited, and may be a double tube, a case where a part or all of a regular refractory is used for at least one of the inner periphery and the outer periphery, and any configuration. Good.

本発明の浸漬管において、芯管の外周面には、外方に向かって突出するスタッドが接合されていることが好ましい。スタッドは、鋼や合金鋼等の金属製の円管状、丸棒状、角棒状、板状の部材を用いて構成させることができる。このスタッドの形状は特に限定されるものではないが、耐火材を効果的に支持するためには、耐火材との間に大きな接触抵抗が生じる形状が望ましく、例えば、Ｖ字形、Ｔ字形、Ｌ字形、Ｙ字形等の屈曲・分岐した形状とすることができる。   In the dip tube of the present invention, it is preferable that a stud protruding outward is joined to the outer peripheral surface of the core tube. The stud can be configured by using a metal tubular, round bar, square bar, or plate member such as steel or alloy steel. The shape of the stud is not particularly limited, but in order to effectively support the refractory material, a shape that generates a large contact resistance with the refractory material is desirable. For example, a V-shape, a T-shape, an L-shape The shape may be a bent or branched shape such as a letter shape or a Y shape.

また、スタッドは、複数設けられ、芯管の表面に広く分散するように設けることが好ましい。これにより、耐火材を広い面積で支持することが可能となる。   Moreover, it is preferable to provide a plurality of studs so as to be widely dispersed on the surface of the core tube. Thereby, it becomes possible to support a refractory material in a wide area.

以下、実施例を用いて本発明を具体的に説明する。   Hereinafter, the present invention will be specifically described with reference to examples.

本発明の実施例として、浸漬管を備えた真空脱ガス装置を製造した。   As an example of the present invention, a vacuum degassing apparatus equipped with a dip tube was manufactured.

（真空脱ガス装置）
本実施例の真空脱ガス装置の全体構造は、図１に示したように、減圧室１を有する炉体２と、炉体２の底部に設けられた２個の環流管３と、各環流管３の下部に連設された浸漬管４とを備えている。 (Vacuum degasser)
As shown in FIG. 1, the overall structure of the vacuum degassing apparatus of the present embodiment includes a furnace body 2 having a decompression chamber 1, two reflux pipes 3 provided at the bottom of the furnace body 2, and each of the reflux flows. A dip tube 4 connected to the lower portion of the tube 3 is provided.

図１に示したように、高温の金属溶湯５は、一方の浸漬管４、その上方に配置されている一方の環流管３の溶湯通過路６から減圧室１に移動し、減圧室１で真空脱ガス処理された後、他方の環流管３の溶湯通過路６から他方の浸漬管４を経て吐出され、取鍋に戻される。これを繰り返すことにより、容器内の金属溶湯の脱ガス処理が実行される。   As shown in FIG. 1, the high-temperature molten metal 5 moves from the one dip tube 4 and the molten metal passage 6 of the one reflux pipe 3 arranged above the dip tube 4 to the decompression chamber 1. After being vacuum degassed, it is discharged from the molten metal passage 6 of the other reflux pipe 3 through the other dip pipe 4 and returned to the ladle. By repeating this, degassing processing of the molten metal in the container is executed.

図２に本実施例における浸漬管の断面図を示した。浸漬管４は、円筒状をなす芯管４０と、芯管４０の内側にほぼ円筒形状に形成された耐火材よりなる内筒部４１と、芯管４０の外側および下端面を一体的に覆う耐火材よりなる円筒形状をなす外筒部４２と、をもつ。   FIG. 2 shows a cross-sectional view of the dip tube in this example. The dip tube 4 integrally covers a cylindrical core tube 40, an inner cylinder portion 41 made of a refractory material formed in a substantially cylindrical shape inside the core tube 40, and the outer and lower end surfaces of the core tube 40. And an outer cylinder portion 42 having a cylindrical shape made of a refractory material.

芯管４０は、炭素鋼である金属板により円筒形状に形成されている。芯管４０の下端部には、内筒部４１を受ける取付板４６が溶接されている。芯管４０の外周面には、Ｖ字形状のスタッド４３が複数個、溶接により芯管４０の外周面に固定されている。芯管４０の下端部には、径方向内方に向かってのびる先端スタッド４４が複数個、溶接されている。   The core tube 40 is formed in a cylindrical shape by a metal plate made of carbon steel. A mounting plate 46 that receives the inner cylinder portion 41 is welded to the lower end portion of the core tube 40. A plurality of V-shaped studs 43 are fixed to the outer peripheral surface of the core tube 40 by welding on the outer peripheral surface of the core tube 40. A plurality of tip studs 44 extending inward in the radial direction are welded to the lower end portion of the core tube 40.

スタッド４３は、耐熱性金属線材をＶ字状に成形し、Ｖ字の谷の頂点を芯管４０の外周面に溶接している。また、Ｖ字状のスタッド４３は、芯管４０の先端の端面にも溶接している。   The stud 43 is formed of a heat-resistant metal wire in a V shape, and the apex of the V-shaped valley is welded to the outer peripheral surface of the core tube 40. Further, the V-shaped stud 43 is also welded to the end face at the tip of the core tube 40.

先端スタッド４４は、耐熱性金属線材を先端がＶ字状の略Ｌ字状に成形し、基端を芯管４０の外周面に溶接している。先端スタッド４４は、芯管４０の外周面に接合された軸方向にのびる接合部４４０と、接合部４４０の先端にもうけられ径方向内方に向かってのびる本体部４４１と、本体部４４１の先端にもうけられた先端部４４２と、を有している。本体部４４１は、軸方向に垂直な平面に沿ってのびるように形成されている。先端部４４２は、先端が拡幅したＶ字状を有し、Ｖ字の谷の頂点が本体部４４１に接合されている。先端部４４２が拡幅する方向は、軸方向に垂直な平面に対して交差する。   The distal end stud 44 is formed by forming a heat-resistant metal wire into a substantially L shape with a V-shaped distal end and welding a proximal end to the outer peripheral surface of the core tube 40. The tip stud 44 includes a joint portion 440 that extends in the axial direction and is joined to the outer peripheral surface of the core tube 40, a main body portion 441 that is provided at the tip of the joint portion 440 and extends radially inward, and a front end of the main body portion 441. And a front end portion 442 provided on the surface. The main body 441 is formed to extend along a plane perpendicular to the axial direction. The tip portion 442 has a V shape with a widened tip, and the apex of the V-shaped valley is joined to the main body portion 441. The direction in which the distal end portion 442 widens intersects a plane perpendicular to the axial direction.

また、先端スタッド４４は、芯管４０の周方向にそって均一な間隔で、複数個（本実施例では２４個）が接合されている。   In addition, a plurality (24 in this embodiment) of the front studs 44 are joined at a uniform interval along the circumferential direction of the core tube 40.

複数の先端スタッド４４は、芯管４０の先端から本体部４４１までの距離が短い先端スタッド４４Ａと、芯管４０の先端から本体部４４１までの距離が長い先端スタッド４４Ｂの二種類が用いられる。二種類の先端スタッド４４Ａ，Ｂは、芯管４０の周方向で交互に位置するようにもうけられている。   Two types of tip studs 44 are used: a tip stud 44A having a short distance from the tip of the core tube 40 to the main body 441, and a tip stud 44B having a long distance from the tip of the core tube 40 to the main body 441. The two types of tip studs 44 </ b> A and 44 </ b> B are provided so as to be alternately positioned in the circumferential direction of the core tube 40.

内筒部４１の内周面４１ａにより、高温の溶湯が通過する垂直方向に延びる溶湯通路４５が形成されている。内筒部４１を形成する耐火材は、ＭｇＯ−Ｃｒ２Ｏ３質のレンガを組み合わせて形成されている。 A molten metal passage 45 extending in the vertical direction through which the high-temperature molten metal passes is formed by the inner peripheral surface 41 a of the inner cylinder portion 41. The refractory material forming the inner cylinder portion 41 is formed by combining MgO—Cr 2 O 3 quality bricks.

外筒部４２を構成する耐火材は、スタッド４３及び先端スタッド４４に機械的に係合している。このため浸漬管の使用期間が長期化して外筒部４２に亀裂が仮に発生したとしても、耐火材よりなる外筒部４２の脱落がスタッド４３及び先端スタッド４４により抑制される。この外筒部４２は、不定形耐火材により形成される。   The refractory material constituting the outer cylinder portion 42 is mechanically engaged with the stud 43 and the tip stud 44. For this reason, even if the use period of the dip tube is prolonged and a crack occurs in the outer cylinder part 42, the outer cylinder part 42 made of a refractory material is prevented from falling off by the stud 43 and the tip stud 44. The outer cylinder portion 42 is formed of an irregular refractory material.

外筒部４２を構成する不定形耐火材は、アルミナ−マグネシア質とされており、耐火材粉粒体と水硬性セメントと水とを混練して形成されているため、固化前の状態では流動性をもつ。固化した不定形耐火材は、スタッド４３及び先端スタッド４４と機械的に係合するため、外筒部４２に亀裂が生じたときであっても、外筒部４２の脱落が抑制される。   The amorphous refractory material constituting the outer cylinder portion 42 is made of alumina-magnesia and is formed by kneading the refractory material granular material, hydraulic cement, and water, so that it flows in a state before solidification. Have sex. Since the solidified amorphous refractory material is mechanically engaged with the stud 43 and the tip stud 44, even when the outer cylinder part 42 is cracked, dropping of the outer cylinder part 42 is suppressed.

本実施例の真空脱ガス装置の浸漬管４は、先端スタッド４４が内径側が拡幅した形状に形成されている。そして、先端スタッド４４が耐火材よりなる外筒部４２に埋まるように内包されている。このため、熱膨張により芯管４０の先端が開く方向に変形しようとすると、先端スタッド４４も、径方向外方に変移しようとする。しかし、先端スタッド４４の拡幅した先端部４４２が外筒部４２に埋まった状態であるため、外筒部４２により先端部４４２の変移が規制される。先端スタッド４４の先端部４４２の径方向外方への変移が規制されることから、先端スタッド４４自身の変移が規制され、この結果、先端スタッド４４が溶接されている芯管４０の先端が変形することが規制される。この結果、芯管４０の熱膨張による変形が抑えられ、芯管４０が外筒部４２に加える応力が小さくなり、耐火材に亀裂が発生する不具合が発生しにくくなる。   The dip tube 4 of the vacuum degassing apparatus of the present embodiment is formed such that the tip stud 44 is widened on the inner diameter side. And the front-end | tip stud 44 is included so that it may be embedded in the outer cylinder part 42 which consists of a refractory material. For this reason, if it is going to change in the direction which the tip of core pipe 40 opens by thermal expansion, tip stud 44 will also try to change to a diameter direction outside. However, since the leading end portion 442 of the leading end stud 44 is buried in the outer cylindrical portion 42, the outer cylindrical portion 42 restricts the displacement of the leading end portion 442. Since the displacement of the distal end portion 442 of the distal end stud 44 in the radially outward direction is restricted, the displacement of the distal end stud 44 itself is restricted. As a result, the distal end of the core tube 40 to which the distal end stud 44 is welded is deformed. To be regulated. As a result, deformation due to thermal expansion of the core tube 40 is suppressed, the stress applied to the outer cylinder portion 42 by the core tube 40 is reduced, and a problem that a crack occurs in the refractory material is less likely to occur.

さらに、本実施例の真空脱ガス装置の浸漬管４は、二種類の先端スタッド４４Ａ，Ｂが芯管４０の周方向で交互に位置するように、周方向に均一な間隔でもうけられている。複数の先端スタッド４４が周方向で均一にもうけられたことで、芯管４０の先端が開く方向に変形するときの応力が偏らなくなり、外筒部４２が受ける応力も偏らなくなる。この結果、外筒部４２が損傷を生じにくくなる。   Furthermore, the dip tube 4 of the vacuum degassing apparatus of the present embodiment is provided at uniform intervals in the circumferential direction so that the two types of tip studs 44A and B are alternately positioned in the circumferential direction of the core tube 40. . Since the plurality of tip studs 44 are uniformly provided in the circumferential direction, the stress when the tip of the core tube 40 is deformed in the opening direction is not biased, and the stress received by the outer cylinder portion 42 is also not biased. As a result, the outer cylinder portion 42 is less likely to be damaged.

さらに、二種類の先端スタッド４４Ａ，Ｂが芯管４０の周方向で交互に位置することで、先端スタッド４４Ａ，Ｂの先端部４４２が同一平面に位置しなくなり、先端スタッド４４が外筒部４２に応力を加える軸方向位置が偏らなくなる。この結果、先端スタッド４４Ａ，Ｂの先端部４４２が同一平面に位置する場合よりも、より浸漬管４の先端での外筒部４２の損傷が抑えられる。   Furthermore, the two types of tip studs 44A and B are alternately positioned in the circumferential direction of the core tube 40, so that the tip portions 442 of the tip studs 44A and B are not located on the same plane, and the tip stud 44 is in the outer cylinder portion 42. The axial position where the stress is applied is not biased. As a result, damage to the outer cylinder portion 42 at the tip of the dip tube 4 is further suppressed than when the tip portions 442 of the tip studs 44A and 44B are located on the same plane.

このように、本実施例の浸漬管４は、耐火材よりなる外筒部４２の損傷が抑えられた浸漬管となっている。   Thus, the dip tube 4 of the present embodiment is a dip tube in which damage to the outer cylinder portion 42 made of a refractory material is suppressed.

１：真空脱ガス装置
２：炉体
３：環流管
４：浸漬管 ４０：芯管
４１：内筒部 ４２：外筒部
４３：スタッド ４４：先端スタッド
４５：溶湯通路 ４６：取付板
５：金属溶湯 1: Vacuum degassing device 2: Furnace body 3: Circulation tube 4: Dip tube 40: Core tube 41: Inner tube portion 42: Outer tube portion 43: Stud 44: Tip stud 45: Molten metal passage 46: Mounting plate 5: Metal Molten metal

Claims (3)

表面にスタッドがもうけられた耐熱性金属よりなる筒状の芯管と、
該スタッドを内包した状態で、該芯管の内側，外側及び先端に配置される耐火材と、
を有し、先端が溶湯に浸漬される浸漬管であって、
該芯管の先端には、径方向内方に向かって伸びる本体部と、該本体部の先端にもうけられた拡幅した先端部と、を備えた先端スタッドを有することを特徴とする浸漬管。 A cylindrical core tube made of a heat-resistant metal with studs on the surface;
Refractory material disposed inside, outside and at the tip of the core tube in a state of including the stud;
A dip tube whose tip is immersed in the molten metal,
A dip tube comprising a tip stud provided at a tip of the core tube with a main body portion extending radially inward and a widened tip portion provided at a tip of the main body portion. 前記先端スタッドは、前記芯管の外周面又は内周面に接合された軸方向にのびる接合部と、該接合部の先端にもうけられ径方向内方に向かってのびる前記本体部と、該本体部の先端にもうけられた前記先端部と、を有する請求項１記載の浸漬管。   The tip stud includes an axially extending joint portion joined to the outer peripheral surface or inner peripheral surface of the core tube, the main body portion provided at the distal end of the joint portion and extending radially inward, and the main body. The dip tube according to claim 1, further comprising: the tip portion provided at a tip of the portion. 前記芯管の先端と前記本体部の距離が異なる複数の先端スタッドを有する請求項１〜２のいずれかに記載の浸漬管。   The dip tube according to any one of claims 1 to 2, further comprising a plurality of tip studs having different distances between a tip of the core tube and the main body.
JP2009009830A 2009-01-20 2009-01-20 Dipping tube Pending JP2010168601A (en)

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