A long argon-blowing nozzle for uniform air blowing

Abstract

This application relates to a uniformly blowing argon nozzle, belonging to the field of steelmaking technology. It includes a main body with a central drain hole and an annular groove on its outer wall. Multiple blowing holes are circumferentially arranged within the main body, with their ends located within the drain hole and the annular groove, respectively. An annular filter screen and an outer ring are arranged within the annular groove, with the outer ring sealing the opening of the groove. A blowing nozzle is fixed to the outer ring. A baffle is fixed to the filter screen opposite the blowing nozzle. A gap is maintained between the filter screen and the end of the blowing hole, and also between the filter screen and the outer ring. In this application, argon gas is compressed and passes through the filter screen and filter screen sequentially, allowing for relatively uniform argon gas flow through both screens, thereby improving the uniformity of the airflow entering each blowing hole and preventing deflection of the molten steel flow. The main body is composed of an upper and lower half, facilitating the manufacture of the annular groove and the installation of objects within it.

Description

Technical Field

[0001] This application relates to the field of steelmaking technology, and in particular to a long argon-blowing nozzle for uniform gas blowing. Background Technology

[0002] One aspect of the steel pouring process is that molten steel flows from the ladle through a long nozzle into the tundish. To prevent secondary oxidation and nitrogen buildup in the molten steel from directly affecting its quality, a long nozzle is used to connect the ladle and tundish, protecting the molten steel from secondary oxidation and quality problems. The upper part of the long nozzle connects to the ladle's lower nozzle, while the lower part inserts into the molten steel in the tundish. However, the rapid flow of molten steel creates suction, drawing surrounding air into the molten steel. To reduce oxidation and prevent external impurities from entering the molten steel, argon blowing is performed at the long nozzle for protection.

[0003] A utility model patent with publication number CN220992804U discloses an argon-blown long nozzle, comprising a long nozzle body with a flow channel running through its center. An iron shell is fitted over one end of the long nozzle body along its length, and an argon-blowing nozzle is mounted on the iron shell. Argon gas is blown into the long nozzle body through the nozzle to the end face along its length. An argon-blowing mechanism is positioned between the iron shell and the end face of the long nozzle body. This mechanism comprises multiple argon-blowing grooves extending from the circumferential sidewalls of the long nozzle body along the flow channel direction, and these grooves are evenly distributed in a fan-shaped pattern. When argon gas is blown into the long nozzle, the gas flows circumferentially, forming a vortex that creates an air curtain between the inner wall of the long nozzle and the molten steel. This effectively prevents outside air from entering the molten steel, preventing secondary oxidation and improving the purity of the molten steel.

[0004] Regarding the aforementioned technologies, the inventors believe that when argon gas is blown into the iron shell from the argon blowing nozzle, more argon gas tends to flow away from the argon blowing groove (i.e., the blowing hole) near the argon blowing nozzle, resulting in less blowing volume in the blowing holes far from the argon blowing nozzle. The blowing volume of different blowing holes is uneven, which can easily cause the molten steel to deflect. This needs to be improved. Utility Model Content

[0005] This application provides a uniformly blowing argon nozzle, which can make the blowing volume of all blowing holes tend to be uniform and avoid the deflection of molten steel flow.

[0006] This application provides a uniformly purging argon nozzle, which adopts the following technical solution:

[0007] A uniformly blowing argon nozzle includes a body with a central leakage hole and an annular groove on the outer side wall. Multiple blowing holes are circumferentially arranged within the body, with the two ends of each hole located within the leakage hole and the annular groove, respectively. An annular filter screen and an outer ring are arranged within the annular groove, with the outer ring sealing the opening of the groove. A blowing nozzle is fixed to the outer ring. A baffle is fixed to the filter screen opposite the blowing nozzle. A gap is maintained between the filter screen and the end of the blowing hole, and also between the filter screen and the outer ring.

[0008] By adopting the above technical solution, argon gas is blown into the annular groove through the air nozzle. The argon gas flow that just enters the annular groove is first blocked by the baffle and then diffuses to both sides. The filter screen has a resistance effect on the passing argon gas. Under continuous air circulation, there is a pressure difference between the outer side and the inner side of the filter screen. The argon gas passes through the filter screen by compression, so that the filter screen can pass through the argon gas more evenly, thereby improving the uniformity of the airflow entering each air blowing hole and preventing the molten steel flow direction from deflecting.

[0009] Optionally, a second annular filter screen is also provided in the annular groove. The second filter screen is located between the first filter screen and the air blowing hole. The mesh size of the second filter screen is smaller than that of the first filter screen. There is a gap between the ends of the second filter screen and the air blowing hole, and there is also a gap between the second filter screen and the first filter screen.

[0010] By adopting the above technical solution, an additional area is separated inside the filter screen 1 by the filter screen 2. The argon gas passing through the filter screen 1 also needs to pass through the filter screen 2 by compression, which further improves the uniformity of the airflow entering each blowing hole.

[0011] Optionally, the body includes an upper half and a lower half, the annular groove is formed between the upper half and the lower half, and the upper half and the lower half are fixed by bolts.

[0012] By adopting the above technical solution, the upper and lower halves are separated, which facilitates the manufacturing of the annular groove and the installation of objects inside the annular groove.

[0013] Optionally, the upper and lower halves are provided with a positioning groove for embedding a filter screen on their opposite sides.

[0014] By adopting the above technical solution, during the assembly of the upper and lower halves, the upper and lower ends of the filter screen are embedded into the corresponding positioning grooves, thereby completing the assembly of the filter screen. The assembly is relatively convenient, and the filter screen has good stability after installation.

[0015] Optionally, the upper and lower halves are provided with positioning grooves for embedding the filter screen.

[0016] By adopting the above technical solution, during the assembly of the upper and lower halves, the upper and lower ends of the filter screen are embedded in the corresponding positioning grooves, thereby completing the assembly of the filter screen. The assembly is relatively convenient, and the filter screen has good stability after installation.

[0017] Optionally, positioning rings are fixed to the upper and lower end faces of the outer ring, and positioning grooves for the positioning rings to be inserted are provided on the opposite sides of the upper and lower halves.

[0018] By adopting the above technical solution, during the assembly of the upper and lower halves, the upper and lower ends of the positioning ring are embedded in the corresponding positioning grooves, thereby completing the assembly of the outer ring.

[0019] Optionally, the number of positioning rings is at least two, and all positioning rings are arranged concentrically.

[0020] By adopting the above technical solution and setting at least two positioning rings, more bent contact surfaces can be formed, improving the airtightness and reducing the leakage of argon gas from the ring groove.

[0021] Optionally, a guide ring is integrally formed on the bottom of the inner wall of the upper half, and a gap is left between the outer wall of the guide ring and the inner wall of the lower half.

[0022] By adopting the above technical solution, if the molten steel touches the inner wall of the vent of the upper half, the molten steel will then fall through the inner wall of the guide ring, thus preventing the molten steel from contacting the connection gap between the upper and lower halves and preventing the upper and lower halves from being fixed after the molten steel cools down.

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

[0024] 1. Argon gas is forced through the filter screen by compression, so that the argon gas can pass through the filter screen more evenly, thereby improving the uniformity of the airflow entering each blowing hole and preventing the molten steel from deflecting.

[0025] 2. By setting up filter screen two, an additional area is separated inside filter screen one. The argon gas that passes through filter screen one needs to pass through filter screen two by compression, which further improves the uniformity of the airflow entering each blowing hole.

[0026] 3. The main body is composed of an upper half and a lower half, which facilitates the manufacturing of the annular groove and the installation of objects inside the annular groove. Attached Figure Description

[0027] Figure 1 This is a perspective view of a uniformly blown argon nozzle according to an embodiment;

[0028] Figure 2 This is a front sectional view of an embodiment;

[0029] Figure 3 yes Figure 2 Enlarged view of point A;

[0030] Figure 4 This is an exploded view of filter screen one, filter screen two, and outer ring in an embodiment.

[0031] Explanation of reference numerals in the attached drawings: 1. Body; 10. Leakage hole; 2. Ring groove; 11. Upper half; 12. Lower half; 13. Air blowing hole; 3. Filter screen one; 4. Outer ring; 41. Air blowing nozzle; 42. Positioning ring; 31. Baffle; 21. Positioning groove one; 22. Positioning groove two; 23. Positioning groove three; 14. Guide ring; 5. Filter screen two. Detailed Implementation

[0032] The present application will be further described in detail below with reference to the accompanying drawings.

[0033] Reference Figure 1 This embodiment discloses a uniformly blowing argon nozzle, comprising a body 1, with a drain hole 10 at the center of the body 1, which serves as a channel for molten steel to fall. An annular groove 2 is formed on the outer wall of the body 1. The body 1 includes an upper half 11 and a lower half 12, with the annular groove 2 formed between the upper half 11 and the lower half 12. The upper half 11 and the lower half 12 are fixed together by bolts; specifically, the bolts pass through the outer wall of the lower half 12 and are threadedly connected to the upper half 11.

[0034] Reference Figure 1 and Figure 2 Multiple air blowing holes 13 are circumferentially opened inside the main body 1. The air blowing holes 13 are specifically opened inside the upper half 11, with the two ends of the air blowing holes 13 located in the leakage hole 10 and the annular groove 2, respectively. The annular groove 2 is provided with a ring-shaped filter screen 3 and an outer ring 4. The outer ring 4 closes the opening of the annular groove 2, and an air blowing nozzle 41 is fixed on the outer ring 4. The air blowing nozzle 41 is a connector used to blow argon gas into the annular groove 2, and then the argon gas enters the leakage hole 10 through the multiple air blowing holes 13.

[0035] Reference Figure 3 The outer ring 4 has positioning rings 42 fixed to its upper and lower ends, with at least two positioning rings 42 arranged concentrically. The upper half 11 and lower half 12 have positioning grooves 23 on their opposite sides for the positioning rings 42 to be inserted. During the assembly of the upper half 11 and lower half 12, the upper and lower ends of the positioning rings 42 are inserted into the corresponding positioning grooves 23, thus completing the assembly of the outer ring 4. By setting at least two positioning rings 42, more bent contact surfaces can be formed, improving the airtightness and reducing the leakage of argon gas from the ring groove 2.

[0036] Reference Figure 2The bottom of the inner wall of the upper half 11 is integrally formed with a guide ring 14, and there is a gap between the outer wall of the guide ring 14 and the inner wall of the lower half 12. If the molten steel touches the inner wall of the leakage hole 10 of the upper half 11, the molten steel will then fall through the inner wall of the guide ring 14, avoiding the molten steel from contacting the connection gap between the upper half 11 and the lower half 12, and preventing the upper half 11 and the lower half 12 from being fixed after the molten steel cools down.

[0037] Reference Figure 3 and Figure 4 The upper half 11 and the lower half 12 are provided with positioning grooves 21 for the filter screen 3 to be inserted on their opposite sides. During the process of assembling the upper half 11 and the lower half 12, the upper and lower ends of the filter screen 3 are inserted into the corresponding positioning grooves 21, thereby completing the assembly of the filter screen 3.

[0038] A baffle 31 is fixed to the filter screen 3 directly opposite the air nozzle 41. A gap is maintained between the filter screen 3 and the end of the air nozzle 13, and also between the filter screen 3 and the outer ring 4. It should be noted that the mesh size of the filter screen 3 should not be too large, and it needs to be able to resist airflow. The baffle 31 is used to block the argon gas blown in by the air nozzle 41, preventing the argon gas from directly passing through the filter screen 3. After impacting the baffle 31, the argon gas flows to both sides, thereby filling the annular space around the filter screen 3.

[0039] A second annular filter screen 5 is also provided inside the annular groove 2. The second filter screen 5 is located between the first filter screen 3 and the air blowing hole 13. The upper half 11 and the lower half 12 have positioning grooves 22 on their opposite sides for the second filter screen 5 to be inserted. During the assembly of the upper half 11 and the lower half 12, the upper and lower ends of the second filter screen 5 are inserted into the corresponding positioning grooves 22, thereby completing the assembly of the second filter screen 5. The mesh size of the second filter screen 5 is smaller than that of the first filter screen 3. There is a gap between the ends of the second filter screen 5 and the air blowing hole 13, and there is also a gap between the second filter screen 5 and the first filter screen 3.

[0040] The implementation principle of a uniformly blowing argon nozzle according to an embodiment of this application is as follows: The body 1 of the argon blowing nozzle is vertically set in use, and argon gas is blown into the annular groove 2 through the blowing nozzle 41. The argon gas flow entering the annular groove 2 is first blocked by the baffle 31, and then diffuses to both sides. Filter screen 1 3 and filter screen 2 5 have a resistance effect on the passing argon gas. Argon gas is more difficult to pass through filter screen 2 5 than filter screen 1 3. Under continuous air circulation, there is a pressure difference in the three areas of the outer side of filter screen 1 3, the area between filter screen 1 3 and filter screen 2 5, and the inner side of filter screen 2 5. Argon gas passes through filter screen 1 3 and filter screen 2 5 in sequence by compression, so that filter screen 1 3 and filter screen 2 5 can pass through argon gas more uniformly, thereby improving the uniformity of the airflow entering each blowing hole 13 and avoiding the deflection of the molten steel flow.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A uniformly blowing argon nozzle, comprising a body (1), wherein a leakage hole (10) is provided at the center of the body (1), characterized in that: The outer wall of the main body (1) is provided with an annular groove (2). Multiple air holes (13) are provided in the circumferential direction of the main body (1). The two ends of the air holes (13) are located in the leakage hole (10) and the annular groove (2) respectively. A ring-shaped filter screen (3) and an outer ring (4) are provided in the annular groove (2). The outer ring (4) closes the opening of the annular groove (2). An air nozzle (41) is fixed on the outer ring (4). A baffle (31) is fixed on the filter screen (3) opposite to the air nozzle (41). There is a gap between the filter screen (3) and the end of the air hole (13), and there is also a gap between the filter screen (3) and the outer ring (4).

2. The argon-blowing long nozzle with uniform air blowing according to claim 1, characterized in that: The annular groove (2) is also provided with a second annular filter screen (5). The second filter screen (5) is located between the first filter screen (3) and the air blowing hole (13). The mesh size of the second filter screen (5) is smaller than that of the first filter screen (3). There is a gap between the ends of the second filter screen (5) and the air blowing hole (13), and there is also a gap between the second filter screen (5) and the first filter screen (3).

3. The argon-blowing long nozzle with uniform air blowing according to claim 2, characterized in that: The body (1) includes an upper half (11) and a lower half (12), and the annular groove (2) is formed between the upper half (11) and the lower half (12). The upper half (11) and the lower half (12) are fixed by bolts.

4. The argon-blowing long nozzle with uniform air blowing according to claim 3, characterized in that: The upper half (11) and the lower half (12) are provided with positioning grooves (21) for the filter screen (3) to be embedded on their opposite sides.

5. The uniformly blown argon nozzle according to claim 3, characterized in that: The upper half (11) and the lower half (12) are provided with positioning grooves (22) for the filter screen (5) to be embedded on their opposite sides.

6. The argon-blowing long nozzle with uniform air blowing according to claim 3, characterized in that: The upper and lower ends of the outer ring (4) are respectively fixed with positioning rings (42), and the upper half (11) and the lower half (12) are provided with positioning grooves (23) for the positioning rings (42) to be inserted into.

7. The uniformly blown argon nozzle according to claim 6, characterized in that: The number of positioning rings (42) is at least two, and all positioning rings (42) are arranged concentrically.

8. The uniformly blown argon nozzle according to claim 3, characterized in that: The bottom of the inner wall of the upper half (11) is integrally formed with a guide ring (14), and there is a gap between the outer wall of the guide ring (14) and the inner wall of the lower half (12).

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