Integrated steel liner structure of RH dip pipe

Abstract

The integrated steel liner structure of the RH dip pipe comprises a steel liner barrel, the upper portion of the steel liner barrel is a steel liner straight barrel section, the lower portion of the steel liner barrel is a steel liner conical barrel section, the diameter of the upper end face of the steel liner conical barrel section is larger than that of the lower end face of the steel liner conical barrel section, and the taper angle of the steel liner conical barrel section ranges from 15 degrees to 25 degrees. The steel liner straight cylinder section and the steel liner conical cylinder section are integrally formed; a flange is fixedly arranged on the periphery of the upper portion of the steel liner cylinder, an anchoring part is welded below the flange in the circumferential direction of the outer side wall of the steel liner cylinder, and a steel wire mesh ring is further arranged on the outer side of the steel liner cylinder and located on the periphery of the anchoring part. The structural design is compact and reasonable, the conical cylinder section and the straight cylinder section on the lower portion of the dip pipe steel liner cylinder are integrally formed, instability, caused by welding, of the steel liner structure is avoided, the anchoring structure of an anchoring part is optimized, anchoring firmness of pouring materials is enhanced, stress concentration and cracks caused by temperature difference changes are reduced, and the service life of the dip pipe steel liner is prolonged. And the service life of the dip pipe is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of RH furnace refining equipment, and particularly relates to an integrated steel bladder structure of an RH immersion tube. Background Art

[0002] RH furnace refining is an important off-furnace refining method for molten steel. Utilizing the principle of vacuum circulation degassing, molten steel from the ladle is drawn into a vacuum chamber through a dip tube and then blown with argon gas. This removes harmful gases such as hydrogen and nitrogen from the molten steel and reduces its carbon content. The steel then flows back into the ladle, where it is refined through the circulation of the molten steel between the ladle and the vacuum chamber. Within the entire RH furnace refining system, the dip tube serves as a rapid circulation channel for the high-temperature molten steel during the refining process. During operation, the RH dip tube is subjected to the erosion of high-velocity gas and molten steel, erosion by slag, and rapid cooling and heating. This harsh operating environment makes it the weakest link in the RH refining equipment, and ensuring its service life is crucial to improving overall refining efficiency.

[0003] The RH immersion tube body consists of a steel bladder, the interior of which is composed of self-flowing material and chrome-free magnesium spinel bricks. Anchors are welded to the exterior of the bladder and cast with corundum castable material. The steel bladder supports the internal and external refractory materials. The operation and service life of the immersion tube is very complex. The steel bladder is exposed to high temperatures for a long time, which reduces its strength, oxidation resistance, and creep resistance, and weakens its load-bearing capacity. The existing upper straight section of the steel bladder and the lower section with a tapered support brick plate are fixed by welding, resulting in poor structural stability. Furthermore, the immersion tube steel bladder is not firmly bonded to the external refractory castable. During alternating hot and cold cycles, the inconsistent expansion rates of the steel bladder and the refractory castable generate stress, causing the castable to crack and fall off, posing a threat to the service life and safety of the immersion tube. Summary of the Invention

[0004] In order to solve the above technical problems, the utility model provides an integrated steel bladder structure of an RH immersion pipe. Its structural design is compact and reasonable. The straight cylinder section on the upper part of the immersion pipe steel bladder and the tapered brick support plate cylinder section on the lower part are integrally formed and arranged, thereby avoiding instability of the steel bladder structure due to welding, optimizing the anchoring structure of the anchoring piece, enhancing the anchoring reliability of the castable, reducing stress concentration and crack generation caused by temperature difference changes, and improving the operating reliability and service life of the immersion pipe.

[0005] The technical solution adopted by the utility model is: an integrated steel bladder structure of an RH immersion tube, comprising a steel bladder cylinder, the upper part of the steel bladder cylinder is a steel bladder straight cylinder section, the lower part of the steel bladder cylinder is a steel bladder conical cylinder section, the steel bladder straight cylinder section is a hollow cylindrical cylinder, the steel bladder conical cylinder section is a hollow conical cylinder, the upper end face diameter of the steel bladder conical cylinder section is larger than the lower end face diameter, and the taper angle of the steel bladder conical cylinder section is 15 to 25 degrees; the steel bladder straight cylinder section and the steel bladder conical cylinder section are integrally formed; a flange is fixedly provided on the outer periphery of the upper part of the steel bladder cylinder, an anchor is welded below the flange and along the circumferential direction of the outer side wall of the steel bladder cylinder, and a wire mesh ring is further provided on the outer side of the steel bladder cylinder at the periphery of the anchor.

[0006] The anchors include V-shaped anchors and Y-shaped threaded anchors. The V-shaped anchors are fixed at equal intervals along the circumferential direction of the outer wall of the steel bladder cylinder. The Y-shaped threaded anchors are arranged at intervals from the V-shaped anchors along the outer wall of the upper cylinder of the steel bladder cone section. The fixed ends of the Y-shaped threaded anchors pass through the wall of the steel bladder cylinder and are welded to the inner and outer surfaces of the steel bladder cylinder.

[0007] The Y-shaped threaded anchor is made of threaded round steel. The lower part of the Y-shaped threaded anchor is a threaded straight rod, and the upper part is a Y-shaped threaded bifurcated rod separated to both sides. The angle between the threaded bifurcated rod and the threaded straight rod is not greater than 45°.

[0008] The V-shaped anchor is a long strip of steel plate, the lower end of which is bent 90° to form a plate-shaped bottom plate, the middle part is a straight plate, the upper end of the straight plate is vertically divided into two forked plates from the middle, and the forked plates are bent 45° in opposite directions on both sides to form a V-shaped structure; the bottom plate of the V-shaped anchor is fitted with the outer wall surface of the steel bladder cylinder, and is welded and fixed to the outer wall surface of the steel bladder cylinder along the four sides of the bottom plate, and the straight plate section of the V-shaped anchor is perpendicular to the outer wall of the steel bladder cylinder.

[0009] The V-shaped anchors are alternately distributed between the upper and lower adjacent layers on the outer wall of the steel bladder according to the vertical and horizontal directions of the bifurcation plate opening, and the interval positions between the upper and lower adjacent layers are staggered.

[0010] A plastic heat shrink tube is sleeved on the outer surface of the bifurcation plate at the upper end of the V-shaped anchor.

[0011] The upper end face of the steel mesh ring is welded and fixed on the flange lower wall face of the steel bladder cylinder, the lower end face of the steel mesh ring is welded and fixed on the lower end face of the steel bladder cylinder, and the circumferential side face of the steel mesh ring surrounds the outer side of the steel bladder cylinder anchor.

[0012] The anchors include V-shaped anchors and Y-shaped threaded anchors. The V-shaped anchors are fixedly arranged at equal intervals along the circumferential direction of the outer wall of the steel bladder tube. The Y-shaped threaded anchors are arranged at intervals from the V-shaped anchors along the outer wall of the upper tube of the steel bladder cone section. The fixed ends of the Y-shaped threaded anchors pass through the wall of the steel bladder tube and are welded to the inner and outer surfaces of the steel bladder tube. The purpose of such arrangement is to increase the adhesion between the steel bladder tube and the refractory castable, and to connect the refractory castable outside the steel bladder tube with the steel wire mesh ring to prevent the refractory castable from cracking, so as to make the bond between the refractory castable and the steel bladder tube more solid, thereby increasing the stability of the steel bladder tube and the outer castable and preventing it from falling off. This makes the expansion rate of the steel structure inner bladder body 1 after heating closer to that of the external refractory castable, improving the problem of stress caused by inconsistent expansion rate.

[0013] The V-shaped anchor is a long strip of steel plate, the lower end of which is bent 90° to form a plate-shaped bottom plate, and the middle part is a straight plate. The upper end of the straight plate is vertically divided into two forked plates from the middle, and the forked plates are bent 45° in opposite directions on both sides to form a V-shaped structure; the bottom plate of the V-shaped anchor fits the outer wall surface of the steel bladder cylinder, and is welded and fixed to the outer wall surface of the steel bladder cylinder along the four sides of the bottom plate, and the straight plate section of the V-shaped anchor is perpendicular to the outer wall of the steel bladder cylinder; the purpose of this arrangement is: the bottom plate of the V-shaped anchor is block-shaped, which increases the contact area with the outer wall of the steel bladder cylinder, and is welded and fixed to the outer wall surface of the steel bladder cylinder along the four sides of the bottom plate, thereby increasing the welding firmness of the V-shaped anchor and making it not easy to fall off, thereby increasing the overall stable structure of the refractory castable outside the steel bladder cylinder.

[0014] The V-shaped anchors are alternately distributed between the upper and lower adjacent layers on the outer wall of the steel bladder cylinder according to the vertical and horizontal directions of the opening direction of the bifurcation plate, and the interval positions between the upper and lower adjacent layers are staggered with each other; the purpose of this arrangement is to evenly distribute the V-shaped anchors along the outer periphery of the steel bladder cylinder, and between adjacent layers, the opening directions of the bifurcation plates are different, namely vertical and horizontal, and the intervals are staggered. The bifurcation plates of the V-shaped anchors have a stronger and firmer ability to grab materials from different directions, thereby enhancing the overall stability of the refractory castable on the outer side of the steel bladder cylinder.

[0015] The outer surface of the bifurcation plate at the upper end of the V-shaped anchor is covered with a plastic heat shrink tube; the purpose of this arrangement is: the outer surface of the bifurcation plate at the upper end of the V-shaped anchor is covered with a plastic heat shrink tube, which acts as an expansion joint. After heating, the plastic heat shrink tube melts, leaving a certain gap as expansion space. When the immersion tube is subject to temperature fluctuations, it can alleviate the problem of refractory castable cracking caused by inconsistent thermal expansion of the steel liner body and the V-shaped anchor and the refractory castable.

[0016] The beneficial effects of the utility model are as follows: the integrated steel bladder structure of the RH immersion pipe has a compact and reasonable design structure, and the tapered cylinder section and the straight cylinder section at the lower part of the steel bladder cylinder of the immersion pipe are integrally formed and arranged, thereby avoiding the instability of the steel bladder structure due to welding, and optimizing the anchoring structure of the anchor, enhancing the anchoring reliability of the castable, reducing the stress concentration and crack generation caused by temperature difference changes, and improving the operation reliability and service life of the immersion pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of the steel bladder of the immersion pipe of the utility model;

[0018] Figure 2 This is a schematic diagram of the longitudinal cross-sectional structure of the steel bladder of the immersion pipe of the utility model;

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the V-shaped anchor of the utility model;

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the Y-shaped threaded anchor of the utility model.

[0021] Markings in the figure: 1. Steel bladder cylinder; 2. Steel bladder straight section; 3. Steel bladder conical section; 4. V-type anchor; 5. Y-type threaded anchor; 6. Steel wire mesh ring; 7. Bottom plate; 8. Straight plate; 9. Fork plate; 10. Threaded straight rod; 11. Threaded fork rod; 12. Plastic heat shrink tubing. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is further described in detail below with reference to the accompanying drawings.

[0023] like Figure 1-4 The figure shows an integrated steel bladder structure for an RH immersion pipe, comprising a steel bladder body 1, an upper portion of which is a straight steel bladder section 2, and a lower portion of which is a conical steel bladder section 3. The straight steel bladder section 2 is a hollow cylindrical body, and the conical steel bladder section 3 is a hollow conical body. The upper end diameter of the conical steel bladder section 3 is larger than the lower end diameter, and the taper angle of the conical steel bladder section 3 is 15 to 25 degrees. The straight steel bladder section 2 and the conical steel bladder section 3 are integrally formed. A flange is fixedly provided on the upper periphery of the steel bladder body 1, and an anchor is welded below the flange and along the circumference of the outer wall of the steel bladder body 1. A wire mesh ring 6 is also provided on the outer side of the steel bladder body 1, surrounding the anchor. The integral formation of the straight steel bladder section 2 and the conical steel bladder section 3 makes the entire immersion pipe more compact and rational in structure, ensuring stable operation in high-temperature, high-pressure, and corrosive environments, and extending its service life.

[0024] The anchors include V-shaped anchors 4 and Y-shaped threaded anchors 5. The V-shaped anchors 4 are fixedly arranged at equal intervals along the circumferential direction of the outer wall of the steel bladder cylinder 1. The Y-shaped threaded anchors 5 are arranged at intervals from the V-shaped anchors 4 along the outer wall of the upper cylinder of the steel bladder cone section 3. The fixed ends of the Y-shaped threaded anchors 5 pass through the wall of the steel bladder cylinder 1 and are welded and fixed to the inner and outer surfaces of the steel bladder cylinder 1.

[0025] The Y-shaped threaded anchor 5 is made of threaded round steel. The lower part of the Y-shaped threaded anchor 5 is a threaded straight rod 10, and the upper part is a Y-shaped threaded bifurcated rod 11 separated to both sides. The angle between the threaded bifurcated rod 11 and the threaded straight rod 10 is not greater than 45°.

[0026] The V-shaped anchor 4 is a long strip of steel plate, the lower end of which is bent 90° to form a plate-shaped bottom plate 7, the middle part is a straight plate 8, the upper end of the straight plate 8 is vertically divided into two forked plates 9 from the middle, and the forked plates 9 are bent 45° in opposite directions on both sides to form a V-shaped structure; the bottom plate 7 of the V-shaped anchor 4 is in contact with the outer wall surface of the steel bladder cylinder 1, and is welded and fixed to the outer wall surface of the steel bladder cylinder 1 along the four sides of the bottom plate 7, and the straight plate 8 section of the V-shaped anchor 4 is perpendicular to the outer wall of the steel bladder cylinder 1.

[0027] The V-shaped anchors 4 are alternately distributed between the upper and lower adjacent layers of the outer wall of the steel liner cylinder 1, with the openings of the bifurcated plates 9 oriented vertically and horizontally, and the spacing between the upper and lower adjacent layers is staggered. V-shaped anchors 4 are evenly spaced along the periphery of the steel liner cylinder 1. Between adjacent layers, the bifurcated plates 9 open in different directions, respectively, in the vertical and horizontal directions, and are staggered. This allows the bifurcated plates 9 of the V-shaped anchors 4 to grip the material more effectively and securely from different directions, thereby enhancing the overall stability of the refractory castable on the outer side of the steel liner cylinder 7.

[0028] A plastic heat shrink tube 12 is sleeved on the outer surface of the bifurcated plate 9 at the upper end of the V-shaped anchor 4 .

[0029] The upper end face of the steel mesh ring 6 is welded and fixed on the lower wall face of the flange of the steel bladder cylinder 1, the lower end face of the steel mesh ring 6 is welded and fixed on the lower end face of the steel bladder cylinder 1, and the circumferential side face of the steel mesh ring 6 is surrounded by the outer side of the anchor of the steel bladder cylinder 1.

[0030] During use, the lining bricks are plugged and assembled inside the steel liner cylinder 1, the bottom of the lining bricks is supported on the brick supporting plate of the steel liner cone section 3, and the refractory castable is fixed to the outside of the steel liner cylinder through anchors and wire mesh rings 6; the outer surface of the bifurcation plate 9 at the upper end of the V-shaped anchor 4 is covered with a plastic heat shrink tube 12, which acts as an expansion joint. After the immersion pipe is heated during operation, the plastic heat shrink tube 12 melts, leaving a certain gap as expansion space. When the immersion pipe is subject to temperature fluctuations, it can alleviate the stress concentration and refractory castable cracking problems caused by the inconsistent thermal expansion of the steel liner cylinder 1 and the V-shaped anchor 4 and the refractory castable.

[0031] The integrated steel bladder structure of the RH immersion pipe has a compact and reasonable design. The steel bladder conical section 3 and the steel bladder straight section 2 at the lower part of the immersion pipe steel bladder cylinder 1 are integrally formed to avoid instability of the steel bladder structure due to welding. The anchoring structure of the anchor is optimized, the anchoring reliability of the castable is enhanced, the stress concentration and crack generation caused by temperature differences are reduced, and the operating reliability and service life of the immersion pipe are improved.

[0032] In addition to the above embodiments, the present invention may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. An integrated steel liner structure for an RH immersion pipe, characterized in that: The invention comprises a steel bladder cylinder body, the upper part of the steel bladder cylinder body is a steel bladder straight cylinder section, the lower part of the steel bladder cylinder body is a steel bladder conical cylinder section, the steel bladder straight cylinder section is a hollow cylindrical cylinder body, the steel bladder conical cylinder section is a hollow conical cylinder body, the upper end face diameter of the steel bladder conical cylinder section is larger than the lower end face diameter, and the taper angle of the steel bladder conical cylinder section is 15 to 25 degrees; the steel bladder straight cylinder section and the steel bladder conical cylinder section are integrally formed; a flange is fixedly provided on the outer periphery of the upper part of the steel bladder cylinder body, an anchor is welded below the flange and along the circumferential direction of the outer wall of the steel bladder cylinder body, and a wire mesh ring is further provided on the outer side of the steel bladder cylinder body and on the periphery of the anchor; The anchors include V-shaped anchors and Y-shaped threaded anchors. The V-shaped anchors are fixed at equal intervals along the circumferential direction of the outer wall of the steel bladder cylinder. The Y-shaped threaded anchors are arranged at intervals from the V-shaped anchors along the outer wall of the upper cylinder of the steel bladder cone section. The fixed ends of the Y-shaped threaded anchors pass through the wall of the steel bladder cylinder and are welded to the inner and outer surfaces of the steel bladder cylinder.

2. The integrated steel liner structure of the RH immersion pipe according to claim 1, characterized in that: The Y-type threaded anchor is made of threaded round steel. The lower part of the Y-type threaded anchor is a threaded straight rod, and the upper part is a Y-shaped threaded bifurcated rod separated to both sides. The angle between the threaded bifurcated rod and the threaded straight rod is not greater than 45°.

3. The integrated steel liner structure of the RH immersion pipe according to claim 1, characterized in that: The V-shaped anchor is a long strip of steel plate, the lower end of which is bent 90° to form a plate-shaped bottom plate, the middle part is a straight plate, the upper end of the straight plate is vertically divided into two forked plates from the middle, and the forked plates are bent 45° in opposite directions on both sides to form a V-shaped structure; the bottom plate of the V-shaped anchor fits against the outer wall surface of the steel bladder cylinder and is welded and fixed to the outer wall surface of the steel bladder cylinder along the four sides of the bottom plate. The straight plate section of the V-shaped anchor is perpendicular to the outer wall of the steel bladder cylinder.

4. The integrated steel liner structure of the RH immersion pipe according to claim 1 or 3, characterized in that: The V-shaped anchors are alternately distributed between the upper and lower adjacent layers on the outer wall of the steel bladder according to the vertical and horizontal directions of the bifurcation plate opening, and the interval positions between the upper and lower adjacent layers are staggered.

5. The integrated steel liner structure of the RH immersion pipe according to claim 1, characterized in that: A plastic heat shrink tube is provided on the outer surface of the bifurcation plate at the upper end of the V-shaped anchor.

6. The integrated steel liner structure of the RH immersion pipe according to claim 1, characterized in that: The upper end face of the wire mesh ring is welded and fixed on the flange lower wall face of the steel bladder cylinder, the lower end face of the wire mesh ring is welded and fixed on the lower end face of the steel bladder cylinder, and the circumferential side face of the wire mesh ring is surrounded by the outer side of the steel bladder cylinder anchor.

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