JP2582127Y2 - Nitrogen absorption prevention structure of immersion pipe for RH equipment - Google Patents
Nitrogen absorption prevention structure of immersion pipe for RH equipmentInfo
- Publication number
- JP2582127Y2 JP2582127Y2 JP1992056461U JP5646192U JP2582127Y2 JP 2582127 Y2 JP2582127 Y2 JP 2582127Y2 JP 1992056461 U JP1992056461 U JP 1992056461U JP 5646192 U JP5646192 U JP 5646192U JP 2582127 Y2 JP2582127 Y2 JP 2582127Y2
- Authority
- JP
- Japan
- Prior art keywords
- air suction
- suction chamber
- equipment
- refractory
- immersion pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、ＲＨ式真空脱ガス設備
用浸漬管の構造に係り、特にシール金物の上方外周にエ
アー吸引用のエアー吸引室を周設した構造とし、吸窒防
止が図れる構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dip tube for RH type vacuum degassing equipment, and more particularly, to a structure in which an air suction chamber for air suction is provided around an outer periphery of a seal metal to prevent nitrogen absorption. Regarding the structure that can be achieved.
【０００２】[0002]
【従来の技術】従来、ＲＨ式真空脱ガス設備における浸
漬管の構造は、例えば図４に縦断面図を示すようにスタ
ッド１等を多数植設した円筒状のシール金物２の内周に
円周方向を複数個に分割した横迫り煉瓦３（以下、内巻
煉瓦と云う）を複数段継ぎ合わせることによって内張り
して内筒とし、該内巻煉瓦３とシール金物２の間および
外周にはキャスタブル耐火物等の不定形耐火物４を施工
し外筒とし、該内・外筒を貫通させた複数本の環流用の
不活性ガス吹込管５を配設し一体化して構成されてい
る。2. Description of the Related Art Conventionally, the structure of a dip tube in an RH type vacuum degassing apparatus is, for example, as shown in a longitudinal sectional view of FIG. A plurality of horizontal pressing bricks 3 (hereinafter referred to as “inner winding bricks”) whose circumferential direction is divided into a plurality of sections are lined together to form an inner cylinder, and the inner cylinder is provided between the inner winding bricks 3 and the sealing hardware 2 and on the outer periphery. An outer cylinder is formed by applying an irregular-shaped refractory 4 such as a castable refractory, and a plurality of recirculating inert gas injection pipes 5 penetrating the inner and outer cylinders are arranged and integrated.
【０００３】周知のように該浸漬管は、環流管の下端部
に取付け取鍋内の溶鋼に浸漬して真空脱ガス処理を行な
うと、溶鋼が保有する高温、溶鋼の環流に伴う衝撃的な
乱流による摩耗あるいは繰返し使用による急熱・急冷に
よって摩耗、スポーリングが発生且つ助長され、損傷す
る。また、一般に外筒を形成する不定形耐火物４は、亀
裂が発生し易い性質を有するだけでなく、かかる苛酷な
諸条件にさらされるとシール金物２が変形を起こし、内
・外筒を形成する内巻煉瓦３および不定形耐火物４に影
響を与えてシール金物２との間に隙間が生じたり、目地
切れ、亀裂等の発生を助長することとなる。そして、不
定形耐火物４とシール金物２との間に生じた隙間あるい
は目地切れ、亀裂発生部等を介して連通し、外気が内外
気圧差によって脱ガス設備内の溶鋼に侵入することとな
る。As is well known, when the immersion pipe is attached to the lower end of the reflux pipe and immersed in molten steel in a ladle to perform vacuum degassing, the high temperature of the molten steel and the shock caused by the reflux of the molten steel. Abrasion and spalling are generated and promoted by wear due to turbulence or rapid heating / cooling due to repeated use, resulting in damage. In addition, generally, the refractory 4 which forms the outer cylinder not only has a property of easily cracking, but also is subjected to such severe conditions, the seal metal 2 is deformed, and the inner and outer cylinders are formed. This affects the inner-brick 3 and the irregular-shaped refractory 4, which may cause a gap with the seal fitting 2, and promote the occurrence of joint breakage, cracks, and the like. And it communicates through the gap | interval or the joint which was generated between the irregular-shaped refractory 4 and the sealing metal 2, a crack generation | occurrence | production part, etc., and external air will invade into the molten steel in degassing equipment by an internal / external pressure difference. .
【０００４】そのため、該外気の侵入を抑止して溶鋼中
の窒素低減を図るため、例えば特公平２−１９１６９号
公報記載の方法のように、シール金物２である鉄芯をガ
ス吹込管に連通した二重壁として構成し、該二重壁の下
端部に吐出孔を穿設して先端耐火物内にＡｒガス等の不
活性ガスを吐出させ鉄芯と不活性ガスによって外気の侵
入を遮断する方法が提案されている。[0004] Therefore, in order to suppress the invasion of the outside air and reduce the nitrogen in the molten steel, an iron core, which is the seal metal 2, is communicated with the gas injection pipe as in a method described in Japanese Patent Publication No. 2-19169, for example. A discharge hole is drilled at the lower end of the double wall to discharge an inert gas such as Ar gas into the refractory at the tip, and the outside air is blocked by the iron core and the inert gas. A way to do that has been proposed.
【０００５】[0005]
【考案が解決しようとする課題】併しながら、例えばＲ
Ｈ真空脱ガス設備の上昇管側に用いる浸漬管は、真空室
に溶鋼を導入するためにＡｒガスを吹き込む環流用不活
性ガス吹込管が通常１段、または上・下段に内・外筒を
貫通させて４〜２０本程度配設してある。そして、該環
流用不活性ガス吹込管を貫通させるためにはシール金物
である鉄芯にも貫通孔を設け、該貫通孔にガス吹込管を
貫通させた後は溶接等の手段によって予め固着させてあ
る。そのため、シール金物である鉄芯を内管と外管から
成る二重壁とした場合は、外気が貫通孔内を通って内筒
側に侵入しないようにするために溶接等の手段によって
固着する作業が、貫通孔と環流用不活性ガス吹込管との
間に隙間が生じないように密着させる必要があるところ
からより煩雑になるだけでなく、シール用としてＡｒガ
ス等を二重壁内に吹き込むシール用ガス吹込管も２〜６
本程度必要となり、倍以上の作業時間と手間を要するよ
うになる等、製造上に問題がある。また、二重壁内にＡ
ｒガスを吹き込んだ場合は、鉄芯全体が冷却されること
によって耐火物との膨張差を吸収することができなくな
り、繰返し使用中における鉄芯と耐火物との剥離現象、
目地切れおよび亀裂等の発生を更に助長し、地金の浸透
によって内巻煉瓦が脱落する等の現象を招くこととな
る。[Problem to be solved by the invention]
The immersion pipe used on the riser side of the H vacuum degassing equipment is usually a one-stage reflux inert gas injection pipe that blows Ar gas to introduce molten steel into the vacuum chamber, or an inner / outer cylinder at the top and bottom. Approximately 4 to 20 wires are penetrated. Then, in order to penetrate the reflux inert gas injection pipe, a through hole is also provided in the iron core which is a seal metal, and after the gas injection pipe is passed through the through hole, it is fixed in advance by means such as welding. It is. Therefore, when the iron core, which is a sealing metal, has a double wall composed of an inner tube and an outer tube, it is fixed by means such as welding to prevent outside air from passing through the through hole and entering the inner tube. The work is not only more complicated because it is necessary to closely adhere so that no gap is formed between the through-hole and the inert gas blowing pipe for reflux, but also Ar gas or the like is used for sealing in the double wall. 2-6 gas injection pipes for sealing
There are problems in manufacturing, such as the need for about this number, which requires twice as much work time and labor. In addition, A
When the r gas is blown, the difference in expansion between the refractory and the refractory cannot be absorbed due to the cooling of the entire iron core.
This further promotes the occurrence of joint breaks and cracks, and causes the phenomenon that the inner bricks fall off due to infiltration of the metal.
【０００６】[0006]
【課題を解決するための手段】本考案者等は、このよう
な諸問題を解決するために種々検討、実験を行なった結
果、本考案の吸窒防止構造の開発に成功したものであ
り、本考案の技術的構成は、溶鋼に浸漬して真空脱ガス
処理を行なう浸漬管のシール金物２の上方に下端を開口
したエアー吸引室７において、該吸引室をフランジ６の
下面より下方に離して周設し、該エアー吸引室７の外周
部にエアー吸引管８端部を接続する接続口９を上端の外
周部に開口した構造とすることによって吸窒防止が図れ
るよう構成したものである。Means for Solving the Problems The present inventors have conducted various studies and experiments in order to solve such problems, and as a result, have succeeded in developing a structure for preventing nitrogen absorption of the present invention. The technical configuration of the present invention is as follows. In an air suction chamber 7 having a lower end opened above a seal fitting 2 of an immersion pipe which is immersed in molten steel and subjected to vacuum degassing, the suction chamber is separated from the lower surface of the flange 6 below. The connection port 9 for connecting the end of the air suction pipe 8 to the outer periphery of the air suction chamber 7 is opened at the outer periphery at the upper end to prevent nitrogen absorption. .
【０００７】[0007]
【作用】本考案においては、シール金物の上方に下端を
開口したエアー吸引室をフランジの下面より下方に離し
て周設し、該エアー吸引室７下端開口部から下方の不定
形耐火物４内に侵入した外気を吸引するようにしてある
ので、稼働中に外筒即ち不定形耐火物４、および内筒即
ち内巻煉瓦３に亀裂、目地切れ等が発生したり、あるい
はシール金物２との間に隙間が生じて開口したとしても
内・外気圧の圧力差によって生じる外気の侵入がなく、
溶鋼中への吸窒を完全に防止することができる。また、
シール金物２の上方にエアー吸引室をフランジの下面よ
り下方に離して周設して侵入した外気を吸引するように
したことによって不活性ガスでシール金物２全体が冷却
されることがなく、内・外筒を形成する耐火物３・４と
の剥離現象、あるいは亀裂発生、目地切れ等を防止する
ことができるので浸漬管の寿命を大幅に延命させること
ができる。In the present invention, an air suction chamber having a lower end opened above the seal metal is provided below the lower surface of the flange and separated from the lower surface of the air suction chamber. The outer cylinder, ie, the refractory material 4 and the inner cylinder, ie, the inner brick 3, may be cracked or cut off during operation, or the seal metal 2 may be sucked. Even if there is a gap between them and they open, there is no intrusion of outside air caused by the pressure difference between the inside and outside air pressure,
Nitrogen absorption into molten steel can be completely prevented. Also,
An air suction chamber is provided above and below the seal fitting 2 so as to be separated from the lower surface of the flange so as to suck in the outside air, so that the entire seal fitting 2 is not cooled by the inert gas. -It is possible to prevent peeling phenomena from the refractories 3 and 4 forming the outer cylinder, crack generation, joint breakage, etc., so that the life of the immersion tube can be greatly extended.
【０００８】[0008]
【実施例】以下、本考案を図１から図３に示す一実施例
を参照しながら更に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described below with reference to an embodiment shown in FIGS.
【０００９】本考案に係る例えばＲＨ設備浸漬管におけ
る吸窒防止構造は、図１に本考案防止構造を適用したＲ
Ｈ設備浸漬管の縦断面図、図２に図１の矢視Ａ−Ａ断面
図、図３に図１のＢ部詳細図を示すように、内筒に円周
方向を複数個に分割した内巻煉瓦３を複数段継ぎ合わせ
て配設し、該内巻煉瓦３の外周面と平行に設け上端部を
フランジ６に固着させた円筒状のシール金物２を介し、
外筒にはキャスタブル耐火物等の不定形耐火物４を配設
して２層構成から成る一体化構造とした従来型ＲＨ設備
用浸漬管に、更にシール金物２の上方に下端を開口した
エアー吸引室７をフランジの下面より下方に離して周設
し、該エアー吸引室７下端開口部から下方の不定形耐火
物４内に侵入した外気を吸引する構造とすることによっ
て構成されている。For example, the structure for preventing nitrogen absorption in a immersion pipe for RH equipment according to the present invention is shown in FIG.
As shown in the vertical sectional view of the H equipment immersion pipe, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a detailed view of a part B in FIG. A plurality of inner winding bricks 3 are joined and arranged, and a cylindrical sealing metal member 2 provided in parallel with the outer peripheral surface of the inner winding brick 3 and having an upper end fixed to a flange 6 is provided.
A conventional immersion pipe for RH equipment having a two-layer integrated structure in which an irregular refractory 4 such as a castable refractory is disposed in the outer cylinder, and an air having a lower end opened above the seal fitting 2. The suction chamber 7 is provided so as to be spaced below the lower surface of the flange, and has a structure for sucking outside air that has entered the amorphous refractory 4 below from the lower end opening of the air suction chamber 7.
【００１０】従来型ＲＨ設備用浸漬管は、内巻煉瓦３と
しては例えばマグネシアム・クロム、高アルミナ質等か
ら成り、所定の内径と肉厚寸法を有した横迫り形状ある
いは扇型形状とし、ＲＨ設備用浸漬管の大きさに合わせ
て円周方向を複数個に分割し、複数段継ぎ合わせた所定
形状の煉瓦で形成されている。該内巻煉瓦３は、外周面
にスタッド１等を所定量植設して上端部をフランジ６に
固着し、下端部内周面に支持受け２ａを設けて円筒状に
形成した鋼鉄製のシール金物２の内側に配設して内筒と
し、内巻煉瓦３とシール金物２との間およびシール金物
２の外周にはキャスタブル耐火物等の不定形耐火物４を
配設して外筒とした２層構成とし、該内・外筒を貫通さ
せた環流用のガス吹込管５を複数本配設して強固に連結
させた一体構造物として形成されている。併し、該従来
型ＲＨ設備用浸漬管は、急熱、急冷を繰返しながら使用
中に外筒を形成する不定形耐火物４および内筒を形成す
る内巻煉瓦３に亀裂、目地切れ等が発生したり、あるい
は変形等によってシール金物２と不定形耐火物４とが剥
離して隙間が生じ、外周面と内周面とが連通した状態と
なると溶鋼に浸漬されていない上方の不定形耐火物４層
から内・外気圧差によって稼働中に外気がＲＨ設備内に
侵入し、溶鋼中に吸窒されることとなる。In the conventional dip tube for RH equipment, the inner winding brick 3 is made of, for example, magnesium chromium, high alumina, or the like, and has a horizontal or fan shape having a predetermined inner diameter and wall thickness. The circumferential direction is divided into a plurality of pieces in accordance with the size of the equipment immersion pipe, and the bricks are formed of bricks of a predetermined shape joined in a plurality of steps. The inner winding brick 3 has a stud 1 or the like implanted in a predetermined amount on the outer peripheral surface, and an upper end portion is fixed to the flange 6, and a support receiving member 2 a is provided on an inner peripheral surface on the lower end portion. 2 and an inner cylinder, and an irregular refractory 4 such as a castable refractory is disposed between the inner brick 3 and the seal hardware 2 and on the outer periphery of the seal hardware 2 to form an outer cylinder. It has a two-layer structure, and is formed as an integrated structure in which a plurality of reflux gas blow-in pipes 5 penetrating the inner and outer cylinders are arranged and strongly connected. At the same time, the conventional immersion pipe for RH equipment has cracks, joint breaks, and the like in the irregular refractory 4 forming the outer cylinder and the inner brick 3 forming the inner cylinder during use while repeating rapid heating and quenching. When the seal metal member 2 and the irregular refractory 4 are separated due to generation or deformation, a gap is generated, and when the outer peripheral surface and the inner peripheral surface are in communication with each other, the upper irregular refractory which is not immersed in the molten steel. The outside air enters the RH equipment during operation due to the difference between the inside and outside pressures from the four layers of the object and is absorbed by the molten steel.
【００１１】そのため、本考案の吸窒防止構造において
は、上記のように形成した従来型ＲＨ設備用浸漬管のシ
ール金物２上方にフランジ６の下面より下方に離しかつ
下端を開口したエアー吸引室７を周設する。Therefore, in the anti-nitrification structure of the present invention, the air suction chamber which is separated from the lower surface of the flange 6 and has a lower end opened above the seal fitting 2 of the conventional immersion pipe for RH equipment formed as described above. 7 is installed.
【００１２】上記エアー吸引室７は、外壁が例えば一般
構造用圧延鋼材等の普通鋼、あるいはステンレス鋼等の
特殊鋼等から成り、所定の内径と肉厚寸法を有し、下端
開口の円筒形状として従来型ＲＨ設備用浸漬管のシール
金物２上方に合わせて形成されている。該エアー吸引室
７は、外筒を形成する不定形耐火物４および内筒を形成
する内巻煉瓦３に亀裂、目地切れ等が発生したり、ある
いは内径拡大、変形等によってシール金物２と不定形耐
火物４とが剥離して隙間が生じた際、外周面と内周面と
が連通するのを遮断し、内・外気圧差によって稼働中に
外気がＲＨ設備内に侵入し、吸窒するのを防止するた
め、溶鋼に浸漬されていない外筒の不定形耐火物４層か
ら侵入した外気を吸引するために設けられるもので、例
えば外壁は肉厚寸法２〜１６ｍｍ程度として内径寸法を
シール金物２の外形寸法よりも大きくし、軸方向はフラ
ンジの下面より下方に離して周設し、下端部が浸漬管の
スラグラインよりも稍下方に位置する寸法として不定形
耐火物４から露出しないように設定し、外側の外周部に
はエアー吸引管８端部を接続する接続口９を設け、下端
を開口してシール金物２の上方外周に周設されている。
上記内径寸法は、小さ過ぎるとエアー吸引室７内を真空
にして吸引した際、侵入した外気を吸引し難く、逆に大
き過ぎるとそれだけ不定形耐火物４の外周面に近付くこ
とによって損傷し易くなるため、必要以上に大きく設定
する必要はなく、シール金物２の外径寸法よりも１５〜
３０ｍｍ程度大きくして軸方向とシール金物２の上方外
周面とで形成される環状空間が真空にした時に侵入した
外気を吸引できる大きさであれば良い。そして、通常各
々のガス吹込管が単体でガス吹込み操作ができるように
複数本の管から成る環流用の不活性ガス吹込管５をシー
ル金物２の所定位置に貫通させて設ける。The air suction chamber 7 has an outer wall made of, for example, ordinary steel such as a rolled steel material for general structure, or special steel such as stainless steel, has a predetermined inner diameter and wall thickness, and has a cylindrical shape having a lower end opening. And is formed above the seal fitting 2 of the conventional immersion pipe for RH equipment. The air suction chamber 7 has a problem in that the irregular refractory 4 forming the outer cylinder and the inner brick 3 forming the inner cylinder are cracked, cut off, etc. When the fixed refractory 4 is peeled off and a gap is generated, communication between the outer peripheral surface and the inner peripheral surface is interrupted, and outside air enters the RH equipment during operation due to a difference in internal / external air pressure, and nitrogen absorption occurs. It is provided to suck in the outside air that has invaded from the four layers of the refractory material of the outer cylinder that is not immersed in the molten steel, for example, the outer wall has a thickness of about 2 to 16 mm and an inner diameter of about 4 to 16 mm. It is larger than the outer dimensions of the seal fitting 2 and is provided in the axial direction so as to be spaced below the lower surface of the flange, and the lower end is exposed from the irregular refractory 4 as a dimension located slightly below the slag line of the immersion pipe. So that the outer periphery is not The connection opening 9 that connects over the suction pipe 8 ends provided, are provided around the upper periphery of the sealing hardware 2 opens the lower end.
If the inside diameter is too small, it is difficult to suck in the outside air when the inside of the air suction chamber 7 is evacuated and sucked. Conversely, if it is too large, it tends to be damaged by approaching the outer peripheral surface of the amorphous refractory 4. Therefore, it is not necessary to set it larger than necessary, and it is 15 to 15
Any size may be used as long as it is made large by about 30 mm and the annular space formed by the axial direction and the upper outer peripheral surface of the seal fitting 2 can suck in the outside air that has entered when the vacuum is applied. Usually, a plurality of inert gas injection pipes 5 for circulation are provided so as to penetrate a predetermined position of the seal fitting 2 so that each gas injection pipe can perform a gas injection operation alone.
【００１３】また、エアー吸引管８端部を接続する接続
口９は、エアー吸引室７内を真空状態にするため、図１
に示すエアー吸引室７の外周部にエアー吸引管８の外径
寸法と略同一の大きさに、円周方向の相対した位置に２
〜４箇所穿設されている。A connection port 9 for connecting the end of the air suction pipe 8 is provided in FIG.
The outer diameter of the air suction chamber 7 shown in FIG.
~ 4 places are drilled.
【００１４】このような前記鋼鉄製の一体物から成るエ
アー吸引室７は、従来型ＲＨ設備用浸漬管のシール金物
２外周に溶接等の手段によって接合させ、接続口９には
フランジ６の直下部から外壁の外周面に沿わせて導入し
たエアー吸引管８を外側から挿入して溶接等の手段によ
り周囲を固着させ、基端側を真空ポンプに接続して吸引
することによって稼働中における外気の侵入がなくな
り、溶鋼中への吸窒を完全に防止することができる。ま
た、シール金物２全体が不活性ガスによって冷却される
ことがなく、繰返し使用中におけるシール金物２と不定
形耐火物４との剥離現象、目地切れおよび亀裂等の発生
を抑制することができる。The above-described air suction chamber 7 made of an integral steel material is joined to the outer periphery of the seal fitting 2 of the conventional immersion pipe for RH equipment by welding or the like. The air suction pipe 8 introduced along the outer peripheral surface of the outer wall from the outside is inserted from the outside, the periphery is fixed by means such as welding, and the base end side is connected to a vacuum pump to suck the outside air during operation. Infiltration disappears, and nitrogen absorption into molten steel can be completely prevented. In addition, the entire seal metal 2 is not cooled by the inert gas, and the occurrence of peeling, joint breakage, cracks, and the like between the seal metal 2 and the refractory 4 during repeated use can be suppressed.
【００１５】本考案の実施例において、エアー吸引室７
を形成する金物の断面形状をコの字型としたが、下端開
口を半円形（逆Ｕ字型）としたり、また外壁に段差を設
けて階段状に形成したり、あるいは下端開口部を斜めに
形成することができ、また、内巻煉瓦は縦方向に一体型
のものでもよく、図示の実施例に限定されるものではな
い。In the embodiment of the present invention, the air suction chamber 7
The metal has a U-shaped cross section. However, the lower end opening is formed in a semicircular shape (an inverted U-shape), the outer wall is provided with a step to form a step shape, or the lower end opening is formed obliquely. In addition, the inner winding brick may be integrally formed in the vertical direction, and is not limited to the illustrated embodiment.
【００１６】[0016]
【考案の効果】以上、説明したように本考案によれば、
溶鋼に浸漬して真空脱ガス処理を行なう浸漬管におい
て、シール金物の上方に下端を開口したエアー吸引室を
フランジの下面より下方に離して周設し、該エアー吸引
室内を真空に保持して侵入した外気を吸引するようにし
たので、稼働中に外筒を形成する不定形耐火物および内
筒を形成する内巻煉瓦に亀裂、目地切れ等が発生した
り、あるいはシール金物との間に隙間が生じても侵入し
た外気を上方部で吸引することによって遮断することが
でき、その結果として溶鋼中への吸窒を完全に防止する
ことができる。また、特公平２−１９１６９号公報記載
の方法のようにシール用として吹き込む不活性ガスによ
ってシール金物全体が冷却されることがなく、内・外筒
を形成する耐火物との剥離現象、あるいは亀裂、目地切
れ等の発生を抑制することができ、浸漬管の寿命を大幅
に延命させることができる[Effects of the Invention] As described above, according to the present invention,
In an immersion pipe that is immersed in molten steel to perform a vacuum degassing process, an air suction chamber having a lower end opened above the seal metal is provided below the lower surface of the flange, and the air suction chamber is held at a vacuum. Since the invading outside air is sucked, cracks, joint breaks, etc. occur in the irregular refractory forming the outer cylinder and the inner winding brick forming the inner cylinder during operation, or between the seal metal Even if there is a gap, the invading outside air can be blocked by sucking it in the upper part, and as a result, nitrogen absorption into the molten steel can be completely prevented. Further, as in the method described in Japanese Patent Publication No. 2-19169, the whole seal metal is not cooled by the inert gas blown for sealing, and the peeling phenomenon with the refractory material forming the inner and outer cylinders, or cracking. , The occurrence of joint breakage can be suppressed, and the life of the immersion tube can be greatly extended.
【図１】本考案防止構造を適用したＲＨ設備浸漬管の縦
断面図FIG. 1 is a longitudinal sectional view of a immersion pipe for RH equipment to which the present invention prevention structure is applied.
【図２】図１の矢視Ａ−Ａ断面図FIG. 2 is a sectional view taken along line AA of FIG.
【図３】図１のＢ部詳細図FIG. 3 is a detailed view of a portion B in FIG. 1;
【図４】従来構造の縦断面図FIG. 4 is a longitudinal sectional view of a conventional structure.
１ スタッド ２ シール金物 ３ 内巻煉瓦 ４ 不定形耐火物 ５ ガス吹込管 ６ フランジ ７ エアー吸引室 ８ エアー吸引管 ９ 接続口 DESCRIPTION OF SYMBOLS 1 Stud 2 Seal metal 3 Inner winding brick 4 Irregular refractory 5 Gas injection pipe 6 Flange 7 Air suction chamber 8 Air suction pipe 9 Connection port
Claims (1)
浸漬管のシール金物２の上方に下端を開口したエアー吸
引室７において、該吸引室をフランジ６の下面より下方
に離して周設し、該エアー吸引室７の外周部にエアー吸
引管８端部を接続する接続口９を上端の外周部に開口し
たことを特徴とするＲＨ設備浸漬管の吸窒防止構造。 1. A air suction chamber 7 having an open lower end above the seal hardware 2 of the immersion tube for performing vacuum degassing treatment was immersed in molten steel, the lower the suction chamber from the lower surface of the flange 6
To release and circumferentially, said air suction chamber 7吸窒prevention structure the connecting port 9 for connecting the air suction tube 8 ends on the outer peripheral portion of the RH equipment dip tube, characterized in that an opening to the outer periphery of the upper end of .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992056461U JP2582127Y2 (en) | 1992-08-11 | 1992-08-11 | Nitrogen absorption prevention structure of immersion pipe for RH equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992056461U JP2582127Y2 (en) | 1992-08-11 | 1992-08-11 | Nitrogen absorption prevention structure of immersion pipe for RH equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0620449U JPH0620449U (en) | 1994-03-18 |
| JP2582127Y2 true JP2582127Y2 (en) | 1998-09-30 |
Family
ID=13027744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992056461U Expired - Lifetime JP2582127Y2 (en) | 1992-08-11 | 1992-08-11 | Nitrogen absorption prevention structure of immersion pipe for RH equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2582127Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4612447B2 (en) * | 2005-03-25 | 2011-01-12 | 新日本製鐵株式会社 | Air leak prevention method for vacuum decarburization refining |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01147016A (en) * | 1987-12-03 | 1989-06-08 | Kawasaki Steel Corp | Method for reducing nitrogen in vacuum degasification of molten steel |
-
1992
- 1992-08-11 JP JP1992056461U patent/JP2582127Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0620449U (en) | 1994-03-18 |
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