Efficient and stable tundish long nozzle structure

Abstract

The utility model discloses an efficient and stable tundish long nozzle structure which comprises a long nozzle body, the long nozzle body comprises an inlet pipe and an outlet pipe which are arranged in a communicating mode, the long nozzle body further comprises a flow guide channel, and the flow guide channel is arranged between the inlet pipe and the outlet pipe in a communicating mode. The flow guide channel comprises an inlet section, a middle section and an outlet section which are sequentially communicated, the end, away from the middle section, of the inlet section is connected with the inlet pipe, the end, away from the middle section, of the outlet section is connected with the outlet pipe, the diameter of the inlet section is gradually increased in the direction close to the middle section, and the diameter of the outlet section is gradually increased in the direction close to the middle section. The diameter of the outlet end is gradually reduced in the direction away from the middle section. The method has the effect of meeting the requirements of iron and steel smelting for high efficiency, energy conservation and environmental protection.

Description

Technical Field

[0001] The present application relates to the technical field of metallurgical casting, and in particular to a highly efficient and stable tundish long nozzle structure. Background Art

[0002] In the process of steel smelting, molten steel casting is a key link. At present, a long nozzle structure is usually used to realize the casting from the tundish to the crystallizer. The long nozzle is a tubular structure that can protect the molten steel from secondary oxidation and prevent the steel flow from splashing. The long nozzle is an important functional refractory structure for realizing molten steel protection casting to improve the quality of steel billets. Its use will directly affect whether the entire continuous casting process can proceed normally. Since the molten steel is prone to generate huge thermal stress inside the long nozzle when passing through the long nozzle, which causes it to crack, the long nozzle needs to be preheated before use to reduce the possibility of cracking or breaking during the pouring process.

[0003] However, the existing long shrouds also have certain problems, such as unstable molten steel flow and large heat loss, which will affect the quality and efficiency of casting. In order to compensate for the defect of unstable molten steel flow, commonly used methods include increasing the length of the long shroud and optimizing the shape of the long shroud.

[0004] With respect to the above-mentioned related technologies, the inventors believe that, in the actual production process, although the above-mentioned solutions can improve the flow state of molten steel to a certain extent, they also increase the heat loss during the flow of molten steel and increase the manufacturing cost of the long shroud. Utility Model Content

[0005] In order to meet the needs of steel smelting for high efficiency, energy saving and environmental protection, the present application provides a highly efficient and stable tundish long shroud structure.

[0006] The present application provides an efficient and stable tundish long nozzle structure adopts the following technical solution:

[0007] A highly efficient and stable tundish long shroud structure comprises a long shroud body, the long shroud body comprises an inlet pipe and an outlet pipe which are connected to each other, and also comprises a guide channel, the guide channel is connected to each other between the inlet pipe and the outlet pipe, the guide channel comprises an inlet section, a middle section and an outlet section which are connected to each other in sequence, the end of the inlet section away from the middle section is connected to the inlet pipe, the end of the outlet section away from the middle section is connected to the outlet pipe, the diameter of the inlet section gradually increases along the direction approaching the middle section, and the diameter of the outlet section gradually decreases along the direction away from the middle section.

[0008] By adopting the above technical solution, molten steel enters the shroud body through the inlet pipe, and then enters the guide channel. Since the inlet section is gradually expanded, the flow rate of the molten steel entering is slowed down. The middle section is in a straight tube shape, and the molten steel flows along the inner wall of the middle section, which can stabilize the flow state of the molten steel therein. The outlet section is set in a gradually contracting shape, which can accelerate the flow rate of the molten steel from the guide channel and reduce the heat loss when flowing out. Through the mutual cooperation of the shroud body and the guide channel, it has the effect of meeting the needs of steel smelting for high efficiency, energy saving and environmental protection.

[0009] Optionally, a plurality of first guide vanes are arranged along the circumferential direction on the inner annular wall of the inlet section, a plurality of second guide vanes are arranged along the circumferential direction on the inner annular wall of the middle section, and a plurality of third guide vanes are arranged along the circumferential direction on the inner annular wall of the outlet section. The first guide vane, the second guide vane and the third guide vane are all arranged at an inclination, and the inclination directions of the first guide vane, the second guide vane and the third guide vane are consistent.

[0010] By adopting the above technical solution, the first guide vane, the second guide vane and the third guide vane play a role in guiding the molten steel. Under the guidance, the molten steel forms a spiral flow, which helps to reduce the generation of turbulence and eddy currents in the guide channel, thereby achieving the effect of improving the casting quality.

[0011] Optionally, a heat-insulating layer is provided on the outer wall of the long shroud body and the guide channel, and the heat-insulating layer is made of high-temperature resistant material.

[0012] By adopting the above technical solution, the insulation layer made of high-temperature resistant material realizes the insulation operation of the long nozzle body, reduces the heat loss during the casting process, and helps to carry out the casting process more stably.

[0013] Optionally, a flow control valve is provided on the outlet section.

[0014] By adopting the above technical solution, the setting of the flow control valve can adjust the flow of molten steel as needed, realize the precise control of the molten steel casting process to meet different process requirements, and improve the production flexibility and processing efficiency.

[0015] Optionally, a hollow annular cavity is provided inside the flow guiding channel.

[0016] By adopting the above technical solution, the setting of the hollow annular cavity transforms the guide channel into a double-layer structure arranged at intervals. The vacuum hollow annular cavity realizes the heat preservation of the molten steel flowing therethrough, thereby reducing the heat loss during the casting process.

[0017] Optionally, an air suction port is provided on the outer wall of the guide channel, the air suction port is communicated with the hollow annular cavity, and a blocking block is embedded in the air suction port.

[0018] By adopting the above technical solution, before casting molten steel, the blocking block is removed, and the hollow annular cavity is vacuumed through the air evacuation port. After the vacuuming operation is completed, the blocking block is reinserted into the air evacuation port. The vacuum hollow annular cavity has better heat insulation and heat preservation, which helps to further reduce heat loss during the casting process.

[0019] Optionally, the inlet section is threadedly connected to the inlet pipe, and the outlet section is threadedly connected to the outlet pipe.

[0020] By adopting the above technical solution, since the guide channel is threadedly connected to the inlet pipe and the outlet pipe, when the guide channel is damaged, the guide channel can be removed separately for replacement or repair, thereby reducing the repair cost of the overall structure.

[0021] Optionally, the shroud body is made of ceramic material.

[0022] By adopting the above technical solution, since the shroud body is made of a ceramic material with high wear resistance, it is helpful to extend the service life of the shroud body.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. Through the cooperation between the shroud body and the diversion channel, it can meet the needs of steel smelting for high efficiency, energy saving and environmental protection;

[0025] 2. The setting of the flow control valve enables the flow of molten steel to be adjusted as needed, improving production flexibility and processing efficiency;

[0026] 3. The first guide vane, the second guide vane and the third guide vane guide the molten steel, which helps to reduce the generation of turbulence and eddy currents in the guide channel, thereby achieving the effect of improving the casting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an embodiment of the present application for embodying an efficient and stable long shroud structure of a tundish.

[0028] Figure 2 It is a partial cross-sectional view used to reflect the internal structure of the long nozzle body in the embodiment of the present application.

[0029] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0030] Explanation of the accompanying drawings: 1. Long water nozzle body; 101. Inlet pipe; 102. Outlet pipe; 2. Guide channel; 21. Inlet section; 22. Middle section; 23. Outlet section; 24. Hollow annular cavity; 25. Air suction port; 3. First guide vane; 4. Second guide vane; 5. Third guide vane; 6. Sealing block; 7. Limiting block; 8. Insulation layer; 9. Mounting ring groove; 10. Sealing ring; 11. Flow control valve. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 The present application is further described in detail. The present application provides an efficient and stable tundish shroud structure, which has the effect of meeting the requirements of high efficiency, energy saving and environmental protection in steel smelting.

[0032] Reference Figure 1 An efficient and stable tundish shroud structure includes a shroud body 1 and a guide channel 2. The shroud body 1 is made of a highly wear-resistant ceramic material, the shroud body 1 includes an inlet pipe 101 and an outlet pipe 102, and the guide channel 2 is connected and arranged between the inlet pipe 101 and the outlet pipe 102.

[0033] Referring to the figure, the flow guide channel 2 includes an inlet section 21, an intermediate section 22 and an outlet section 23 which are connected in sequence. The diameter of the inlet section 21 gradually expands in the direction close to the intermediate section 22, and the diameter of the outlet section 23 gradually decreases in the direction away from the intermediate section 22. The intermediate section 22 is in the shape of a straight tube, and the diameter of the intermediate section 22 is equal to the maximum diameter of the inlet section 21 and the outlet section 23. The opening end of the inlet section 21 is provided with an external thread, and one end of the outlet section 23 is provided with an external thread. One end of the inlet pipe 101 is provided with an internal thread, and one end of the outlet pipe 102 is provided with an internal thread. The external thread of the inlet section 21 is threadedly connected to the internal thread of the inlet pipe 101, and the external thread of the outlet section 23 is threadedly connected to the internal thread of the outlet pipe 102.

[0034] Referring to the figure, a plurality of first guide vanes 3 are fixedly connected to the inner ring wall of the inlet section 21 at equal intervals along the circumferential direction, a plurality of second guide vanes 4 are fixedly connected to the inner ring wall of the middle section 22 at equal intervals along the circumferential direction, and a plurality of third guide vanes 5 are fixedly connected to the inner ring wall of the outlet section 23 at equal intervals along the circumferential direction. The first guide vanes 3, the second guide vanes 4, and the third guide vanes 5 are arranged obliquely in the guide channel 2, and the first guide vanes 3, the second guide vanes 4, and the third guide vanes 5 have the same inclination direction.

[0035] Referring to the figure, a hollow annular cavity 24 is provided in the interior of the guide channel 2 along the circumferential direction, and an air extraction port 25 is provided on the outer annular wall of the guide channel 2. The air extraction port 25 is connected to the hollow annular cavity 24, and a blocking block 6 is embedded in the air extraction port 25. The blocking block 6 is cylindrical, and a limiting block 7 is coaxially fixedly connected to the side of the blocking block 6 facing the outside. The diameter of the limiting block 7 is larger than the diameter of the limiting block 6, and one end of the limiting block 7 abuts against the outer wall of the guide channel 2. An insulation layer 8 is provided on the outer wall of the guide channel 2 and the drain, and the insulation layer 8 is made of high temperature resistant material. The open end of the inlet pipe 101 is provided with a mounting ring groove 9 along the circumferential direction, and a sealing ring 10 is embedded in the mounting ring groove 9. A flow control valve 11 is provided on the outlet section 23.

[0036] Referring to the figure, when molten steel is cast, the molten steel enters and flows into the inlet section 21 of the guide channel 2 through the inlet pipe 101 of the long nozzle. Since the inlet section 21 is gradually expanded, the flow rate of the molten steel entering the guide channel 2 is slowed down. The middle section 22 is in a straight tube shape, and the molten steel flows along the inner wall of the middle section 22, which can stabilize the flow state of the molten steel therein and maintain the uniform flow of the molten steel therein. The outlet section 23 is set in a gradually contracting shape, which can accelerate the flow rate of the molten steel from the guide channel 2 and reduce the heat loss when flowing out. Since the outer part of the long nozzle and the guide channel 2 is provided with an insulation layer 8 made of high temperature resistant material, the thermal efficiency of the long nozzle can be further improved and the energy consumption in the process of molten steel casting can be reduced. Since the open end of the inlet pipe 101 is provided with a sealing ring 10, the open end of the inlet pipe 101 is connected with other structures during casting. The setting of the sealing ring 10 fills the gap at the connection position between the two, reduces the possibility of heat dissipation from the connection gap, and further improves the thermal efficiency of the long nozzle.

[0037] Referring to the figure, the first guide vane 3, the second guide vane 4 and the third guide vane 5 are obliquely arranged on the inner ring wall of the guide channel 2, which play a role in guiding the molten steel. Under the guidance of the first guide vane 3, the second guide vane 4 and the third guide vane 5, the molten steel forms a spiral flow in the guide channel 2, further increasing the stability of the molten steel flow, helping to reduce the generation of turbulence and eddy currents in the guide channel 2, thereby achieving the effect of improving the casting quality. The flow control valve 11 is arranged at the open end of the outlet section 23, and the flow of molten steel can be adjusted as needed to achieve precise control of the molten steel casting process, so as to meet different process requirements and improve production flexibility and processing efficiency. Since the long nozzle body 1 is made of a ceramic material with strong wear resistance, the service life of the long nozzle body 1 can be extended.

[0038] Referring to the figure, since the inside of the guide channel 2 is provided with a hollow annular cavity 24 along the circumferential direction, before casting, the blocking block 6 is removed, and the hollow annular cavity 24 is evacuated by using a vacuum device through the air suction port 25. After the vacuum is completed, the blocking block 6 is inserted into the corresponding air suction port 25, and the setting of the limit block 7 prevents the blocking block 6 from falling into the hollow cavity. The vacuum hollow annular cavity 24 plays a role in heat insulation and heat preservation for the guide channel 2, which helps to improve the heat preservation performance of the guide channel 2 and reduce heat consumption. Since the guide channel 2 is threadedly connected to the inlet pipe 101 and the outlet pipe 102, when the structure in the guide channel 2 is damaged, the guide channel 2 is unscrewed for repair and replacement.

[0039] The implementation principle of an efficient and stable tundish long nozzle structure in the embodiment of the present application is as follows: when molten steel is cast, the molten steel flows into the guide channel 2 through the inlet pipe 101. Since the inlet section 21 is gradually expanded, the flow rate of the molten steel entering the guide channel 2 is slowed down. The middle section 22 is in a straight tube shape, and the molten steel flows along the inner wall of the middle section 22, which can stabilize the flow state of the molten steel therein. The outlet section 23 is set in a gradually contracting shape, which can accelerate the flow rate of the molten steel from the guide channel 2 and reduce the heat loss when flowing out. The first guide plate 3, the second guide plate 4 and the third guide plate 5 are tilted on the inner ring wall of the guide channel 2, which plays a role in guiding the molten steel. The molten steel forms a spiral flow in the guide channel 2 under guidance, which helps to reduce the generation of turbulence and eddy currents in the guide channel 2, thereby achieving the effect of improving the casting quality. The flow control valve 11 is set at the opening end of the outlet section 23, and the flow rate of the molten steel can be adjusted as needed.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An efficient and stable tundish shroud structure, comprising a shroud body (1), wherein the shroud body (1) comprises an inlet pipe (101) and an outlet pipe (102) which are connected to each other, characterized in that: The invention also comprises a flow guiding channel (2), the flow guiding channel (2) being arranged in communication between the inlet pipe (101) and the outlet pipe (102), the flow guiding channel (2) comprising an inlet section (21), a middle section (22) and an outlet section (23) which are arranged in communication in sequence, the end of the inlet section (21) away from the middle section (22) being connected to the inlet pipe (101), the end of the outlet section (23) away from the middle section (22) being connected to the outlet pipe (102), the diameter of the inlet section (21) gradually increasing in a direction approaching the middle section (22), and the diameter of the outlet section (23) gradually decreasing in a direction away from the middle section (22).

2. The efficient and stable tundish shroud structure according to claim 1, characterized in that: A plurality of first guide vanes (3) are arranged along the circumferential direction on the inner ring wall of the inlet section (21), a plurality of second guide vanes (4) are arranged along the circumferential direction on the inner ring wall of the middle section (22), and a plurality of third guide vanes (5) are arranged along the circumferential direction on the inner ring wall of the outlet section (23), wherein the first guide vane (3), the second guide vane (4) and the third guide vane (5) are all arranged in an inclined manner, and the inclination directions of the first guide vane (3), the second guide vane (4) and the third guide vane (5) are consistent.

3. The efficient and stable tundish shroud structure according to claim 1, characterized in that: A heat-insulating layer (8) is provided on the outer wall of the shroud body (1) and the guide channel (2), and the heat-insulating layer (8) is made of a high-temperature resistant material.

4. The efficient and stable tundish shroud structure according to claim 1, characterized in that: The outlet section (23) is provided with a flow control valve (11).

5. The efficient and stable tundish shroud structure according to claim 3, characterized in that: A hollow annular cavity (24) is provided inside the flow guiding channel (2).

6. The efficient and stable tundish shroud structure according to claim 5, characterized in that: An air suction port (25) is provided on the outer wall of the guide channel (2), the air suction port (25) is communicated with the hollow annular cavity (24), and a sealing block (6) is embedded in the air suction port (25).

7. The efficient and stable tundish shroud structure according to claim 1, characterized in that: The inlet section (21) is threadedly connected to the inlet pipe (101), and the outlet section (23) is threadedly connected to the outlet pipe (102).

8. The efficient and stable tundish shroud structure according to claim 1, characterized in that: The shroud body (1) is made of ceramic material.

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