GAS PURGING DEVICE

Abstract

The invention relates to a gas purging device for installation in a metallurgical vessel, said device having the following features in a position installed in the bottom of the metallurgical vessel: a lower, largely gas-tight base part, a gas line runs in the base part from a first end in the region of a first outer face of the base part to a second end in the region of a second outer face of the base part, the second end of the gas line is formed as a first portion of a coupling, a second portion of a coupling is located in the region of an outer connection face of a functional part, by means of which the functional part rests against the base part, a gas distribution device runs in the functional part from the second portion of the coupling, through the functional part, to at least one free surface of the functional part formed as a gas outlet face, the base part and functional part are each made of a refractory ceramic material.

Claims

1. A gas purging device for installation in a metallurgical vessel, comprising the following features in its installed position: a) a lower, gas-tight base part (10), b) a gas line (12) runs in the base part (10) from a first end in the region of a first outer face (101) of the base part (10) to a second end in the region of a second outer face (10o) of the base part (10), c) the second end of the gas line (12) is formed as a first portion (14) of a coupling, d) a second portion (26) of the coupling is located in the region of an outer connection face (20u) of a functional part (20), by means of which the functional part (20) rests against the base part (10), e) a gas distribution device (24) runs in the functional part (20) from the second portion (26) of the coupling, through the functional part (20), to at least one free surface (20o) of the functional part (20) formed as a gas outlet face, f) the base part (10) and functional part (20) are made of refractory ceramic materials.

2. The gas purging device according to claim 1, the first and second portions (14, 26) of the coupling of which are formed as corresponding portions in a form-fitting manner.

3. The gas purging device according to claim 1, in which the first portion (14) of the coupling protrudes beyond the second outer face (10o) of the base part (10) and the second portion (26) of the coupling is formed by a corresponding indentation (26v) in the connection face (20u) of the functional part (20).

4. The gas purging device according to claim 1, in which the second outer face (10o) of the base part (10) is an upper face of the base part (10) and the outer connection face (20u) of the functional part (20) is a lower face of the functional part (20).

5. The gas purging device according to claim 1, in which the second outer face (10o) of the base part (10) and the outer connection face (20u) of the functional part (20) run relative one another in a form-fitting manner.

6. The gas purging device according to claim 1, in which the second outer face (10o) of the base part (10) and the outer connection face (20u) of the functional part (20) are planar faces.

7. The gas purging device according to claim 1, in which the base part (10) and the functional part (20) in a vertical cross-section have one of the following geometries: rectangle, square, trapezium, triangle, polygon, segment of a circle, U-shape, L-shape.

8. The gas purging device according to claim 1, in which the functional part (20) adjacently to the gas outlet face (20o) has a zone (22z) that wholly or partially has a non-directed open porosity.

9. The gas purging device according to claim 1, in which the functional part (20) adjacently to the gas outlet face (20o) has a zone (22z) that wholly or partially has a directed open porosity.

10. The gas purging device according to claim 1, in which the gas line (12) runs largely horizontally in the base part (10) from a first end in the region of a vertical lateral outer face (10r) of the base part (10), through the base part (10), and then in a manner rising to the first portion (14) of the coupling.

11. The gas purging device according to claim 1, in which the gas line (12) has a spiralled portion in the base part.

12. The gas purging device according to claim 1, in which the portions (14, 26) of the coupling are arranged centrally in the direction of a longitudinal axis (L) of the device.

13. The gas purging device according to claim 1, in which the portions (14, 26) of the coupling can be connected to one another in a gas-tight manner.

14. The gas purging device according to claim 1, in which the portions (14, 26) of the coupling are formed by separate components (14o, 14s; 26v, 26e) which are fastened to the base part (10) and to the functional part (20).

15. The gas purging device according to claim 1, in which the functional part (20) is rotatable relative to the base part (10), wherein the coupling has the function of a swivel joint.

Description

[0052] The drawings show the following, in each case in a schematic depiction:

[0053] FIG. 1: a vertical longitudinal section through a base part;

[0054] FIG. 2: a vertical longitudinal section through a functional part which can be connected to the base part according to FIG. 1;

[0055] FIG. 3: a gas purging device formed of a base part and functional part according to FIGS. 1 and 2 when installed, in a perspective view;

[0056] FIG. 4: the gas purging device according to FIG. 3 in an installed/functional position in a tundish;

[0057] FIG. 5: a depiction according to FIG. 3 for a further embodiment of a gas purging device.

[0058] Like or equivalent components are depicted in the drawings by like reference signs.

[0059] FIG. 1 shows a base part 10 made of refractory ceramic material in the form of a square-beam (FIG. 3), that is to say in the form of an elongate cuboid having six outer faces running at right angles to one another, of which a first outer face 101 (small end face on the left) and an upper (large) end face 10o are referenced in FIG. 1.

[0060] A gas line 12 made of metal runs from a first end in the region of the side face 101 approximately horizontally into the base part 10 and then has a spiralled portion 12s, which opens out into a lower end 14o of a first coupling portion 14, which is secured as a separate metallic component in a corresponding indentation in the base part 10. The upper end 14o protrudes beyond the upper end face 10o of the base part 10, wherein the protruding part 14o of the coupling portion 14 is cylindrical and has a gas outlet connection nozzle 14s, which protrudes freely upwardly.

[0061] FIG. 2 shows an associated functional part 20, again in the form of an elongate cube (FIG. 3), wherein the functional part 20 is longer in the longitudinal direction (horizontal direction) (length L) than the base part 10 (length 1).

[0062] The functional part 20 has a lower connection face 20u, in which a circular indentation 26v is formed centrally (in the longitudinal direction L), said indentation being formed by a pocket-shaped metal part.

[0063] The indentation 26v has an extension 26e upwardly, but with a smaller diameter. The extension 26e consists of a metal sleeve. The indentation 26v and extension 26e form a second coupling portion 26. They can alternatively also be formed in situ in the refractory material of the functional part 20.

[0064] The extension 26e and indentation 26v are designed with regard to their dimensions such that the first coupling portion 14 (upper portion 14o, connection piece 14s) of the base part fits flush (gas-tight) in the second coupling part 26 (indentation 26v, extension 26e) on the functional part 20 when the functional part 20 is placed via its underside 20u on the upper side 10o of the base part 10 (FIG. 3).

[0065] In order to improve the gas tightness, a seal, for example a refractory graphite seal, can be inserted between the connection piece 14s and the inner wall of the extension 20e.

[0066] A bore 22 extends vertically upwardly from the extension 26e to a gas distribution chamber 24 running horizontally in the functional part 20.

[0067] The refractory material beneath the gas distribution chamber and laterally beside the gas distribution chamber 24 is gas-tight to the greatest possible extent. The zone 22z of the refractory material running above the gas distribution chamber 24 is gas-permeable and is formed with non-directed (open) porosity. The upper free end face 20o of the functional part is the face that rests against a metal melt in the functional position of the device. A gas is delivered into the melt via the face 20o.

[0068] The base part 10 and functional part 20, as shown in FIG. 3, are assembled by placing the functional part 20 on the base part. The base part can already have been firmly anchored beforehand in the metallurgical vessel (FIG. 4). The functional part 20 is placed on the base part 10 such that the indentation 26v and the extension 26e (which form the second portion 26 of the coupling) are placed in a form-fitting manner on the upper portion 14o and the connection piece 14s (which form the first portion 14 of the coupling).

[0069] Due to the arrangement of the coupling portions, the functional part 20 can then be brought into the functional position, in which the functional part 20 is aligned with the base part 10 (FIG. 4), by horizontally rotating the functional part 20 about an axis A-A, which runs centrally and vertically through the coupling portions.

[0070] The base part 10 is installed in the bottom B of the metallurgical vessel (tundish T in FIG. 4), and the gas line 12 is connected to a gas supply. The functional part 20 is then placed in position, as described above.

[0071] The functional part 20 is fixed in the metallurgical vessel, as depicted in FIG. 4, by applying a refractory lining W to the walls of the metallurgical vessel (T) in such a way that it covers end portions 201, 20r of the functional part 20. A release of the functional part 20 from the base part 10 during operation as soon gas is delivered via the gas line 12, through the coupling (14, 26) and the gas distribution chamber 24 and the porous zone 22z and the surface 20o, into an associated metal melt is thus avoided.

[0072] The embodiment according to FIG. 5 differs from the embodiment according to FIGS. 1 to 4 merely by the specific geometric shape of the base part and functional part 20.

[0073] The base part 10 and functional part 20 are again beam-shaped.

[0074] An L-shaped part is cut away on the base part 10 at an end portion (in the longitudinal direction of the base part), such that a U-shape of the base part 10 is produced in a side view, wherein one limb of the U 10k is shorter and narrower than the other limb of the U 10b, with a connection portion 10v therebetween. The end portion ends at a distance from the middle (M) of the base part.

[0075] The other end portion (on the right in the drawing) is shaped similarly, but in a mirrored manner with respect to a plane running vertically through the base part with B/2, wherein B is the width of the base part 10.

[0076] A cylindrical space R is formed between the two U-shaped end portions, into which space a cylindrical pin Z protrudes, said pin being part of the functional part 20 and being formed between end portions of the functional part 20.

[0077] The end portions of the functional part 20 are each formed in a manner corresponding to the end portions of the base part 10, such that a form fit is produced when the functional part 20 is firstly placed via its coupling part (not depicted) on the coupling part (not depicted) of the base part 10 and the functional part is then rotated horizontally in an anticlockwise direction (arrow). The coupling parts are formed similarly to those of the first exemplary embodiment. The finished assembled position corresponds to that according to the first exemplary embodiment.

[0078] As a result of the recesses H formed by the shorter limb 10k, the connecting web 10v, and the wider limb 10b, a mechanical fixing of the functional part 20 to the base part 10 is achieved when the corresponding limbs of the functional part are introduced into the corresponding recesses H of the base part.