Novel butt joint structure of RH dip pipe
By welding the upper end of the steel liner to the inner ring of the flange in the RH immersion pipe, and making the upper end face of the lining brick inside the immersion pipe lower than the upper end of the steel liner, an inner and outer weld is formed, which solves the gap problem caused by flange deformation, reduces the risk of steel leakage, and improves welding strength and airtightness.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-09
- Publication Date
- 2026-04-14
AI Technical Summary
The flange connections of existing RH-impregnated pipes are prone to deformation under high-temperature environments, leading to gaps and increasing the risk of steel leakage.
By welding the upper end of the steel liner to the inner ring of the flange, and placing the upper end face of the lining brick inside the impregnation pipe below the upper end of the steel liner, airtightness is increased, and welds are formed on both the inner and outer sides to enhance welding strength.
It effectively avoids gaps caused by flange deformation, reduces the probability of steel leakage accidents, and improves welding strength and airtightness.
Smart Images
Figure CN224119038U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of RH impregnation tube technology, specifically a novel docking structure for RH impregnation tubes. Background Technology
[0002] The RH furnace is one of the most advanced ladle refining equipment for molten steel. It uses the principle of vacuum circulation degassing to remove harmful gases such as hydrogen and nitrogen from molten steel and reduce carbon content, thereby further improving the purity of molten steel and ensuring its quality. In the entire RH furnace refining equipment, the RH immersion tube is the channel for the rapid circulation of high-temperature molten steel during the refining process, and it is also the part with the weakest service life in the entire RH furnace refining equipment.
[0003] RH-impregnated tubes need to be connected to the refining furnace, such as Figure 1 As shown, both the steel liner 1 in the impregnation tube and the steel shell 2 of the RH vacuum tank in the refining furnace are equipped with flanges 3. The two flanges 3 are connected by wrapping steel strip rings 4 around the outside of the two flanges 3 and welding them at the edge of the steel strip rings 4, thereby realizing the connection between the steel liner 1 and the steel shell 2 of the RH vacuum tank.
[0004] However, the above connection method has the following hidden dangers: During the refining process, flange 3 is prone to deformation in the high-temperature environment. The weight of the immersion tube will increase as slag accumulates during use, which will increase the downward tension of the immersion tube body. Since the weld 5 of the steel strip ring 4 is located at the outer ring of the two flanges 3, while the steel liner 1 and the RH vacuum tank steel shell 2 in the refining furnace are connected at the inner ring of the two flanges 3, the inner ring of the two flanges 3, which is most affected by the tension, is not connected. This makes it easy for gaps to form at the inner ring of the two flanges 3, which in turn leads to the gap between the lining brick 6 of the immersion tube and the circulating tube brick 7 becoming larger, causing a steel leakage accident. Utility Model Content
[0005] To address the shortcomings of existing technologies, this invention provides a novel docking structure for RH-impregnated tubes, thereby resolving the problems mentioned in the background section.
[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a novel docking structure for RH impregnation tubes, comprising a steel liner and an RH vacuum tank shell, wherein the steel liner is provided with an impregnation tube lining brick, the RH vacuum tank shell is provided with a circulation tube brick, a flange is provided at the bottom of the RH vacuum tank shell, the upper end of the steel liner is welded to the inner ring of the flange, and the diameter of the steel liner is equal to the diameter of the RH vacuum tank shell.
[0007] Preferably, the upper end face of the lining brick of the impregnation tube is offset from the upper port of the steel liner.
[0008] Preferably, the upper end face of the lining brick of the impregnation tube is lower than the upper port of the steel liner.
[0009] Preferably, welds are provided between the inner and outer sides of the upper port of the steel liner and the flange.
[0010] Preferably, a groove is provided at the joint between the circulating pipe brick and the impregnating pipe lining brick.
[0011] Beneficial effects
[0012] This utility model provides a novel butt joint structure for RH immersion tubes, which has the following advantages: by welding the upper end of the steel liner to the inner ring of the flange, the welded joint of the steel liner can be made perpendicular to the steel shell of the RH vacuum tank, avoiding gaps between the steel liner and the flange due to flange deformation, and reducing the occurrence of steel leakage accidents; by making the upper end face of the lining brick of the immersion tube lower than the upper end of the steel liner, the airtightness can be increased and the welding of the inner and outer welds can be facilitated, thereby increasing the welding strength. Attached Figure Description
[0013] Figure 1 This is a diagram of the internal structure of existing technology;
[0014] Figure 2 This is a diagram of the internal structure of this utility model.
[0015] In the diagram: 1. Steel tank; 2. RH vacuum tank steel shell; 3. Flange; 4. Steel strip ring; 5. Weld; 6. Impregnated pipe inner lining brick; 7. Circulation pipe brick; 8. Groove; 9. Casting material. Detailed Implementation
[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0017] Please see Figure 2 This utility model provides a technical solution: 1. A novel butt joint structure for RH impregnation tubes, comprising a steel liner 1 and an RH vacuum tank steel shell 2. The steel liner 1 is provided with an impregnation tube lining brick 6, and the RH vacuum tank steel shell 2 is provided with a circulation tube brick 7. A flange 3 is provided at the bottom of the RH vacuum tank steel shell 2. The upper end of the steel liner 1 is welded to the inner ring of the flange 3. The diameter of the steel liner 1 is equal to the diameter of the RH vacuum tank steel shell 2, so that the weld of the steel liner 1 is perpendicular to the RH vacuum tank steel shell 2, avoiding gaps between the steel liner 1 and the flange due to deformation of the flange 3, and reducing the occurrence of steel leakage accidents.
[0018] Furthermore, the upper end face of the lining brick 6 inside the impregnation tube is offset from the upper port of the steel liner 1 to increase airtightness.
[0019] Furthermore, the upper end face of the lining brick 6 inside the impregnation tube is lower than the upper end of the steel liner 1, which not only increases the airtightness but also facilitates welding to the inner side of the upper end of the steel liner 1, forming two welds 5, thus increasing its welding strength.
[0020] Furthermore, a groove 8 is provided at the joint between the circulating tube brick 7 and the immersion tube lining brick 6. The groove 8 can thicken the refractory 9 at the joint between the circulating tube brick 7 and the immersion tube lining brick 6, so as to prevent the molten steel from directly contacting the steel liner 1 when there is an abnormality in the joint between the immersion tube lining brick 6 and the circulating tube brick 7.
[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A novel butt joint structure for RH impregnation tubes, comprising a steel liner (1) and an RH vacuum tank steel shell (2), wherein the steel liner (1) is provided with an impregnation tube lining brick (6), the RH vacuum tank steel shell (2) is provided with a circulation tube brick (7), and a flange (3) is provided at the bottom of the RH vacuum tank steel shell (2), characterized in that, The upper end of the steel liner (1) is welded to the inner ring of the flange (3), and the diameter of the steel liner (1) is equal to the diameter of the steel shell (2) of the RH vacuum tank.
2. The novel butt joint structure for RH-impregnated pipes according to claim 1, characterized in that, The upper end face of the lining brick (6) of the impregnation tube is misaligned with the upper port of the steel liner (1).
3. The novel butt joint structure for RH-impregnated pipes according to claim 2, characterized in that, The upper end face of the lining brick (6) of the impregnated tube is lower than the upper port of the steel liner (1).
4. The novel butt joint structure for RH-impregnated pipes according to claim 3, characterized in that, Welds (5) are provided on both the inner and outer sides of the upper port of the steel liner (1) and the flange (3).
5. The novel butt joint structure for RH-impregnated pipes according to claim 1, characterized in that, A groove (8) is provided at the joint between the circulating pipe brick (7) and the impregnated pipe lining brick (6).