JPS6145151Y2 - - Google Patents

Description

【考案の詳細な説明】 この考案は、RHガス装置の下降浸漬管に関す
るものであり、この下降浸漬管を上昇浸漬管とし
ても使えるようにしたものである。[Detailed description of the invention] This invention relates to a descending immersion pipe for an RH gas device, and the descending immersion pipe can also be used as an ascending immersion pipe.

一般に脱ガス装置は、上部槽１と下端に一対の
環流管２ａ，２ｂを突設した下部槽２とからな
り、その環流管２ａ，２ｂの一方に上昇浸漬管３
を接続すると、他方には下降浸漬管４を接続す
る。この装置での脱ガス処理に当つては、かかる
上昇・下降浸漬管３，４を取鍋内溶鋼中に浸漬
し、前記上昇管から不活性ガスを用いる環流ガス
を吹込むとともに、前記上部槽１および下部槽２
内圧力を変動させることにより、溶鋼が浸漬管
３，４を通して該上・下部槽１，２内と取鍋とを
往き来する過程の中で脱ガスを行うのである。 Generally, a degassing device consists of an upper tank 1 and a lower tank 2 having a pair of reflux pipes 2a, 2b protruding from the lower end, and a rising immersion pipe 3 connected to one of the reflux pipes 2a, 2b.
When connected, the descending dip tube 4 is connected to the other side. For degassing in this device, the rising and falling immersion pipes 3 and 4 are immersed in the molten steel in the ladle, and a reflux gas using an inert gas is blown from the riser pipe, and the upper tank is immersed in the molten steel in the ladle. 1 and lower tank 2
By varying the internal pressure, the molten steel is degassed during the process of moving back and forth between the upper and lower tanks 1 and 2 and the ladle through the immersion pipes 3 and 4.

前記浸漬管のうちの上昇管３と下降管４とは構
造的に区別してあつて、前者には管壁の中服に内
面に向けて開口する複数個の環流ガス吹込み用通
孔５を設けるが、後者の下降管４にはそのような
通孔５は設けないのが普通である。第２図、第３
図にそれら２つの浸漬管について示す。 The rising pipe 3 and the descending pipe 4 of the immersion pipe are structurally distinct, and the former has a plurality of holes 5 for blowing recirculating gas that open toward the inner surface in the inner wall of the pipe. However, the latter downcomer pipe 4 is usually not provided with such a through hole 5. Figures 2 and 3
The figure shows these two dip tubes.

このように、浸漬管が上昇管３と下降管４とに
区別された構造になつていると、管壁を構成する
耐火物のライニング：即ち同示例の内張りれんが
６，６′には、当然侵食の程度に差が出る。要す
るに、上昇管３はその通孔５付近を中心に侵食が
速いため、浸漬管の取替寿命が上昇管３側に律速
され、そのために未だ十分に使用に耐え得る下降
管４部の取替えが強要され、コスト面で不利な状
況となつていた。 If the immersion pipe has a structure in which the rising pipe 3 and the descending pipe 4 are separated, the refractory lining that constitutes the pipe wall, that is, the lining bricks 6 and 6' in the same example, naturally There are differences in the degree of erosion. In short, since the ascending pipe 3 is rapidly eroded mainly around the through hole 5, the replacement life of the immersion pipe is rate-limited by the rising pipe 3. Therefore, it is difficult to replace the descending pipe 4, which is still fully usable. They were forced to do so and were at a disadvantage in terms of cost.

この考案は、前述のような浸漬管寿命が上昇管
と下降管とでは著しく異なるという状況を克服す
るために、寿命の半ばで上昇管・下降管をそのま
まで実質的にそれらのもつ機能を交換できるよう
にし、浸漬管総体としての寿命を飛躍的に増大さ
せたものである。そのために本考案では、以下に
説明するように、下降管部に対し、寿命の半ばで
これを上昇管としても使えるような構造を付与
し、従来の欠点を有利に解消するようにしたので
ある。以下にその構成の詳細を説明する。 In order to overcome the above-mentioned situation in which the lifespan of the immersion pipe is significantly different between the riser pipe and the downcomer pipe, this idea replaces the functions of the riser pipe and the downcomer pipe while leaving them as they are midway through their lifespan. This dramatically increases the lifespan of the immersion tube as a whole. To this end, in the present invention, as will be explained below, the downcomer section is given a structure that allows it to be used as an ascending pipe in the middle of its life, thereby advantageously overcoming the drawbacks of the conventional system. . The details of the configuration will be explained below.

図面の第５図、第６図は本考案にかかる下降浸
漬管４′について示す。この下降浸漬管４′の特色
は、第４図に示す従来の下降浸漬管４とは異なり
環流ガス吹込み用の次のような孔を有することで
ある。すなわち、環流ガスの導入管７に連通する
孔を、浸漬管内壁面を形成する前記内張りれんが
６中に設けてなるものである。この孔は、従来の
通孔５とは異なり、使用の中期まではその開口を
内壁面に露出させることはなく、使用の半ばに達
して内壁面の減摩が進行して始めて露出開口する
盲孔８としてある。 5 and 6 of the drawings show a descending dip tube 4' according to the present invention. A feature of this descending dip tube 4', unlike the conventional descending dip tube 4 shown in FIG. 4, is that it has the following hole for blowing the reflux gas. That is, a hole communicating with the reflux gas introduction pipe 7 is provided in the lining brick 6 forming the inner wall surface of the immersion pipe. Unlike the conventional through hole 5, this hole is not exposed to the inner wall surface until the middle of use, and is not exposed until the middle of use and when the friction of the inner wall has progressed. It is designated as hole 8.

このような環流ガス吹込み用盲孔８を、下降浸
漬管４′の管壁中服に複数個埋設しておくこと
で、損傷の激しい下降浸漬管３の寿命が来たと
き、該下降浸漬管４′の盲孔８が露出し開口する
ので、溶湯の環流方向を逆転させれば今度は逆に
この下降浸漬管４′を上昇管として使用できるよ
うになるのである。この場合上昇浸漬管３の通孔
５は不定形耐火物で詰め物をしたりして補修する
が、そのまま放置すれば溶湯のさし込みが起り自
動的に通孔閉塞を行うことになるので、実質その
ままで下降浸漬管４′の機能をもつようになる。 By embedding a plurality of such blind holes 8 for blowing reflux gas into the wall of the descending immersion pipe 4', when the severely damaged descending immersion pipe 3 reaches the end of its life, the descending immersion Since the blind hole 8 of the pipe 4' is exposed and opened, the descending dipping pipe 4' can now be used as a rising pipe by reversing the direction of the molten metal circulation. In this case, the through hole 5 of the rising dipping pipe 3 is repaired by filling it with monolithic refractory material, but if left as is, molten metal will be inserted and the hole will be automatically blocked. Substantially, it functions as a descending dip tube 4'.

なお、前記盲孔８の開口は周方向で均一にはな
らないので、予め詰め物をしておき、必要なとき
導入管７のガス圧によつて外し均等時期の開口を
行うようにしてもよい。 Incidentally, since the openings of the blind holes 8 are not uniform in the circumferential direction, it is also possible to fill the blind holes 8 in advance and remove them using the gas pressure of the introduction pipe 7 when necessary, so that the openings are made at equal times.

以上説明したような下降浸漬管を採用すれば、
上昇管損耗によつて律速される浸漬管の取替え寿
命が大巾に向上し、耐火物原単位や取替え作業の
軽減ということに対し有利である。 If you adopt the descending dip tube as explained above,
The replacement life of the immersion pipe, which is determined by wear and tear on the riser pipe, is greatly improved, which is advantageous in terms of reducing the unit consumption of refractories and the amount of replacement work.

【図面の簡単な説明】[Brief explanation of the drawing]

図面の第１図はRH脱ガス装置の概略を示す断
面図、第２図は従来の上昇浸漬管の断面図、第３
図は従来の下降浸漬管の断面図、第４図は従来の
上昇浸漬管の平面図ならびに通孔部の断面図、第
５図は本考案下降浸漬管の平面図ならびに環流ガ
ス吹込み用盲孔部の断面図、第６図は本考案下降
浸漬管の縦断面図である。 １……上部槽、２……下部槽、３……上部浸漬
管、４，４′……下部浸漬管、５……通孔、６…
…内張りれんが、７……環流ガス導入管、８……
環流ガス吹込み用盲孔。 Figure 1 of the drawings is a cross-sectional view showing the outline of the RH degassing device, Figure 2 is a cross-sectional view of a conventional ascending immersion tube, and Figure 3 is a cross-sectional view of a conventional ascending immersion pipe.
Figure 4 is a sectional view of a conventional descending immersion tube, Figure 4 is a plan view of a conventional ascending immersion tube and a sectional view of the through hole, and Figure 5 is a plan view of the descending immersion tube of the present invention and a blind for blowing recirculating gas. A sectional view of the hole, and FIG. 6 is a longitudinal sectional view of the descending dip tube of the present invention. 1... Upper tank, 2... Lower tank, 3... Upper immersion pipe, 4, 4'... Lower immersion pipe, 5... Through hole, 6...
... Lining brick, 7... Reflux gas introduction pipe, 8...
Blind hole for blowing circulating gas.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] RH脱ガス下部槽下端に突設した環流管に接続
される下降浸漬管に対し、その管壁内に環流ガス
導入管に連通する複数個の吹込み盲孔を、管内壁
面の損耗によつて露出し開口する位置に埋設して
おくことを特徴とするRH脱ガス装置の下降浸漬
管。 For the descending immersion pipe connected to the recirculation pipe protruding from the lower end of the lower RH degassing tank, multiple blind injection holes communicating with the recirculation gas introduction pipe were installed in the pipe wall due to wear and tear on the inner wall surface of the pipe. A descending dip tube for an RH degassing device characterized by being buried in an exposed and open position.