Securing device for a cylindrical ceramic hollow body and fireproof ceramic gas purging brick having such type of securing device

Abstract

To improve the position of a cylindrical ceramic hollow body the invention relates to a securing device for use with a gas purging brick, where the securing device has the following characteristics in its operational position: A base body which, with its bottom and a circumferential wall, defines a cylindrical space with a corresponding central longitudinal axis, the bottom features an opening whose longitudinal axis aligns with the central longitudinal axis the bottom features a ring-shaped channel which extends concentrically around the opening. at least an inner wall of the channel which is adjacent to the opening consists of a material which is plastically ductile under the application of pressure, a ring-shaped compact whose radial wall cross-section increases in size upwards from a lower free end, so that the inner wall of the channel deforms plastically, thereby reducing the cross section of the opening, after the compact is pressed into the channel.

Claims

1. Refractory ceramic gas purging brick with the following characteristics in an operational position in a bottom of a metallurgic vessel: a) a gas distribution chamber (GV) at a lower end b) multiple securing devices (10) which are arranged at a distance to each other in the area of a ceiling (MB) of the gas distribution chamber (GV), where c) each securing device (10) holds a cylindrical ceramic hollow body (SR), each of which extends through a ceramic base material (MM) of the gas purging brick up to its upper face, wherein each securing device comprises: 1) a base body (12) which, with its bottom (12B) and a circumferential wall (12W), defines a cylindrical space (12R) with a corresponding central longitudinal axis (M), 2) the bottom (12B) features an opening (12O) whose longitudinal axis (L) aligns with the central longitudinal axis (M), 3) the bottom (12B) features a ring-shaped channel (14N) which extends concentrically around the opening (12O), 4) at least an inner wall (14I) of the channel (14N) which is adjacent to the opening (12O) consists of a material which is plastically ductile under application of pressure, 5) a ring-shaped compact (16) whose radial wall cross-section increases in size upwards from a lower free end (16U), thereby reducing the cross section of the opening (12O), 6) a shape of the ring-shaped compact (16) is to be chosen in such a way that it is able to enter the channel (14N) over a small distance in an unloaded manner, before the compact (16) is pressed further into the channel (14N) in an axial direction of the securing device, wherein 7) the ring-shaped channel (14N) extends into a discrete element (14), which forms an upper segment of the bottom (12B) and is arranged without any substantial play in the space (12R).

2. Gas purging brick according to claim 1, wherein the ceiling (MB) of the gas distribution chamber (GV) consists of metal and the securing devices are attached in through holes (DB) of this ceiling (MB) by welding (S).

3. Securing device for a cylindrical ceramic hollow body (SR) in a gas purging brick, the securing device having the following characteristics in its operational position: a) a base body (12) which, with its bottom (12B) and a circumferential wall (12W), defines a cylindrical space (12R) with a corresponding central longitudinal axis (M), b) the bottom (12B) features an opening (12O) whose longitudinal axis (L) aligns with the central longitudinal axis (M), c) the bottom (12B) features a ring-shaped channel (14N) which extends concentrically around the opening (12O), d) at least an inner wall (14I) of the channel (14N) which is adjacent to the opening (12O) consists of a material which is plastically ductile under application of pressure, e) a ring-shaped compact (16) whose radial wall cross-section increases in size upwards from a lower free end (16U), thereby reducing the cross section of the opening (12O), f) a shape of the ring-shaped compact (16) is to be chosen in such a way that is able to enter the channel (14N) over a small distance in an unloaded manner, before the compact (16) is pressed further into the channel (14N) in an axial direction of the securing device, wherein (g) the ring-shaped channel (14N) extends into a discrete element (14), which forms an upper segment of the bottom (12B) and is arranged without any substantial play in the space (12R).

4. Securing device according to claim 3, wherein the ring-shaped channel (14N) in the bottom (12B) features a rectangular cross section in the radial direction.

5. Securing device according to claim 3, wherein the ring-shaped channel (14N) in the base (12B) features a cross section which radially enlarges upwards, towards the open end.

6. Securing device according to claim 3, wherein the discrete element (14) is made of a material which is plastically ductile under the application of pressure.

7. Securing device according to claim 3, wherein the compact (16) is made of a material which is plastically ductile under the application of pressure.

8. Securing device according to claim 3, wherein the plastically ductile material is a material which is a material from the group which comprises the following materials: copper, copper alloys, aluminium, aluminium alloys, tin, tin alloys, zinc, zinc alloys.

9. Securing device according to claim 3 with at least one circumferential recess (14R) on at least one of the following surfaces: inner surface (14II) of the inner wall (14I), outer surface (14AA) of the outer wall (14A).

10. Securing device according to claim 3 wherein the recess (14R) features a saw-tooth-like profile.

11. Securing device according to claim 3 with a lid (18) which is attachable to the base body (12) and features a lid opening (18O) which extends concentrically to the opening (12O) in the bottom of the base body (12).

12. Securing device according to claim 11, wherein the lid (18) and the base body (12) can be screwed together.

13. Securing device according to claim 11, wherein the lid (18) features an extension (18V) which can be inserted into the space (12R) in a form-fitted manner and also features a drilling (18B) which extends concentrically to the lid opening (18O).

Description

(1) The figures showeach in a schematic representation:

(2) FIG. 1: a vertical longitudinal section through a gas purging brick

(3) FIG. 2: a vertical longitudinal section through a securing device in connection with a gas distribution chamber of a gas purging brick.

(4) In the following figure description all details refer to the mounting (position) of a gas purging brick in the bottom of a metallurgic vessel, such as a ladle, wherein a treatment gas flows through the gas purging element in the axial direction from the bottom to the top.

(5) The gas purging device shown in FIG. 1 features a gas supply pipe GZ which discharges into a gas distribution chamber GV at the lower (cold) end of the gas purging brick.

(6) The gas distribution chamber is confined by a metal sheet MB at the upper end. The metal sheet MB features multiple through holes DB, four of which can be seen in FIG. 1.

(7) A lower end 12E of a securing device 10, as it is further described in the following, extends through each through hole DB.

(8) A (one) cylindrical ceramic hollow body, also called purging tube SR, extends through each securing device 10. Each purging tube SR lies in the region of the through hole DB with a lower end, and extends in its axial direction through a matrix material MM of the gas purging brick up to its face ST, wherein the face ST touches a metal melt MS in the operational position.

(9) A treatment gas is correspondingly fed through the gas supply pipe GZ, flows through the gas distribution chamber GV and the through holes DB into the purging tubes SR before it exits the purging tubes SR via the face ST and flows into the metal melt MS.

(10) Because the gas flows through the gas purging brick more or less in one direction (axially), this gas purging brick can be identified as a gas purging brick with directed porosity, even though the matrix material MM is generally gastight.

(11) FIG. 2 shows a securing device 10 in concurrence with the metal sheet MB, thus the ceiling of the gas distribution chamber GV.

(12) The securing (fixation) device 10 consists of a base body 12 which, with its bottom 12B and a circumferential wall 12W, defines a cylindrical space (volume) 12R with a corresponding central longitudinal axis M.

(13) The bottom 12B features an opening 12O whose longitudinal axis L aligns with the central longitudinal axis M.

(14) A discrete element 14 which generally features a pot-shape, rests on the bottom 12B. The element 14 features a bottom 14B which rests on the bottom 12B of the base body 12 and thereby forms an upper segment of the bottom. The element 14 furthermore features an inner wall 14I and an outer wall 14A. A channel 14N is formed between the inner wall 14I and the outer wall 14A, which generally features a rectangular cross section in the unloaded state (not shown).

(15) An inner surface 14II of the inner wall 14I and an outer surface 14AA of the outer wall 14A of the element 14 are characterised by multiple ring-shaped grooves 14R, which are connected in a saw-tooth-like fashion with each other (in the axial direction LM).

(16) The securing device according to FIG. 2 is displayed in a state where the corresponding purging tube SR is already fixed in place, namely by the means of a ring-shaped compact 16. The compact 16 is characterised by the facts that its radial wall cross section enlarges from a lower free end 16U upwards, so that the inner wall 14I of the channel 14N, or rather the element 14 is deformed when the compact 16 is pressed into the channel 14N.

(17) In other words: upon driving of the compact 16, the ring shaped inner wall 14I, which confines the channel 14N on the inside, has deformed radially to the inside and thereby connected to the outer wall of the purging tube SR, in fact over a certain surface area, and fixed the purging tube SR in the securing device 10 securely and in a gastight manner.

(18) In order to achieve this deformation the element 14 is made of brass while the base body 12 is a steel body. Under the pressure of the compact 16 not only the inner wall 14I of the body 14 was deformed and has quasi turned into a gasket for the purging tube SR; simultaneously the outer wall 14A of the element 14 was also pushed radially to the outside and therefore clamped the element 14 into the base body 12.

(19) The driving (pressing) of the heading tool/compact 6 occurs with the aid of a lid 18 in this embodiment, which features an axially extending extension 18V with an outer thread 18A below a head 18K, which interacts with a corresponding inner thread 12I of the base body.

(20) Head 18K and the extension 18V feature a continuous drilling 18O which is used to position the purging tube SR without any play. The drilling 18O therefore generally extends concentrically/aligned with the opening 120 and to the free space which is confined by the inner wall 14I.

(21) As soon as the lower face 18U of the lid 16 has reached the compact 16 it is further pushed downwards into the channel 14N in order to achieve the desired deformation, especially of the inner wall 14I, until the desired fixation of the purging tube SR is reached.

(22) Between the lid head 18K and the corresponding upper rim of the base body 12 only a small slit S (for tolerances) will remain when the compact 16 is pressed into the channel 14N up to a maximum level.

(23) The fixation of the securing device 10 onto the metal sheet MB takes place either by welding (weld V) in the region of the through hole DB or by the formation of corresponding inner/outer threads in the through hole DB and the outer surface of the lower, tapered end 12E of the base body 12.