Combined current stabilizer

Abstract

The utility model discloses a combined type current stabilizer which comprises a bottom plate, an inner vertical frame arranged on the bottom plate and an outer vertical frame arranged on the bottom plate, the inner vertical frame comprises a first inner side wall, a second inner side wall and a third inner side wall, and the outer vertical frame comprises a first outer side wall, a second outer side wall and a third outer side wall. The second end of the first inner side wall and the second end of the second inner side wall enter the space between the first outer side wall and the second outer side wall from the second opening, and a first flow field improving channel is formed between the first inner side wall and the first outer side wall and / or between the second inner side wall and the second outer side wall. According to the scheme, the design of a conventional closed flow stabilizer is broken through, a double-layer wall structure is adopted, two wall faces arranged in a laminated mode are designed, the design scheme opens up two parallel first flow field improvement channels, the flowing property of molten steel is improved by optimizing fluid power, and in addition, the flowing property of the molten steel is improved by reducing the dead zone volume in the flow stabilizer. Floating of inclusions in molten steel is effectively promoted, and the quality of casting blanks is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to continuous casting metallurgical equipment technical field, specifically a combined flow stabilizer. BACKGROUND

[0002] In prior art, the flow stabilizer is installed in the impact area of the tundish, used for receiving the molten steel from the ladle, reducing the size of the vortex area formed by the molten steel impact, protecting the bottom working layer of the tundish, slowing down the scouring of the molten steel to the working layer around the impact area, and promoting the floating of the inclusions in the molten steel and improving the cleanliness of the molten steel. The flow stabilizer in prior art cannot well distribute the molten steel in the flow stabilizer and reduce the impact vortex due to the limitation of the structure. SUMMARY

[0003] Therefore, the utility model wants to solve the technical problem of providing a combined flow stabilizer which can effectively distribute the molten steel in the flow stabilizer, limit the vortex area, reduce the dead volume in the flow stabilizer, promote the floating of the inclusions in the molten steel and improve the quality of the casting blank.

[0004] To solve the above technical problems, the utility model provides the following technical scheme: a combined flow stabilizer, comprising a bottom plate, an inner vertical frame arranged on the bottom plate and an outer vertical frame arranged on the bottom plate; the inner vertical frame comprises a first inner side wall, a second inner side wall and a third inner side wall, the first inner side wall and the second inner side wall are two opposite side walls, and the third inner side wall is sealingly connected with the first end of the first inner side wall and the first end of the second inner side wall respectively; the outer vertical frame comprises a first outer side wall, a second outer side wall and a third outer side wall, the first outer side wall and the second outer side wall are two opposite side walls, and the third outer side wall is sealingly connected with the first end of the first outer side wall and the first end of the second outer side wall respectively.

[0005] A first opening is arranged between the second end of the first inner side wall and the second end of the second inner side wall, a second opening is arranged between the second end of the first outer side wall and the second end of the second outer side wall, and the second end of the first inner side wall and the second end of the second inner side wall enter between the first outer side wall and the second outer side wall from the second opening.

[0006] The first inner side wall and the first outer side wall and / or the second inner side wall and the second outer side wall form a first flow field improvement channel, and the molten steel in the inner vertical frame is in fluid communication with the first flow field improvement channel through a second flow field improvement channel.

[0007] The second flow field improvement channel is a tapping hole arranged on the first inner side wall and / or the second inner side wall, and the tapping hole is the second flow field improvement channel.

[0008] The combined flow stabilizer, the tapping hole is gradually inclined and raised upward from the inlet end to the outlet end.

[0009] The combined flow stabilizer, the angle between the axis of the tapping hole and the horizontal line is 15-25 degrees on the plane perpendicular to the direction of the molten steel flow in the first flow field improvement channel; and the axis of the tapping hole is perpendicular to the direction of the molten steel flow in the first flow field improvement channel on the plane passing through the tapping hole.

[0010] The combined flow stabilizer, the upper part of the second end vertical surface of the first inner side wall is sealingly connected with the third outer side wall, and the lower part of the second end vertical surface of the first inner side wall is provided with a third flow field improvement channel for guiding the molten steel in the inner vertical frame to the outside of the inner vertical frame and fluidly connected with the first flow field improvement channel.

[0011] The combined flow stabilizer, the upper part of the second end vertical surface of the second inner side wall is sealingly connected with the third outer side wall, and the lower part of the second end vertical surface of the second inner side wall is provided with a third flow field improvement channel for guiding the molten steel in the inner vertical frame to the outside of the inner vertical frame.

[0012] The combined flow stabilizer, the second end of the first inner side wall and the second end of the second inner side wall are respectively sealingly connected with the third outer side wall.

[0013] The combined flow stabilizer, the second end of the first inner side wall and the second end of the second inner side wall are respectively sealingly connected with the third outer side wall, and the second flow field improvement channel is the space above the first inner side wall and / or the second inner side wall.

[0014] The combined flow stabilizer, the upper part of the third outer side wall between the second end of the first inner side wall and the second end of the second inner side wall extends towards the third inner side wall.

[0015] The combined flow stabilizer, the upper part of the first outer side wall extends towards the first inner side wall, and the upper part of the second outer side wall extends towards the second inner side wall.

[0016] The technical scheme of the utility model has the following beneficial technical effects:

[0017] 1. The scheme breaks through the conventional closed flow stabilizer design, adopts double-wall structure, changes the single wall to two stacked wall surfaces, which not only opens two parallel first flow field improvement channels, but also improves the flow field through optimizing fluid dynamics, and improves the flow performance of molten steel. In addition, by reducing the dead volume inside the flow stabilizer, effectively promoting the floating of inclusions in the molten steel, improving the quality of the casting blank.

[0018] 2. By setting the upper part of the inner stand connected with the outer stand, and the lower part of the inner stand connected with the outer stand, a second flow field improvement channel is arranged between them, so that the molten steel can be uniformly distributed, further promoting the floating of steel slag, and reducing the phenomenon of serious local erosion. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The embodiment 1 of the utility model discloses a three-dimensional structure schematic diagram;

[0020] Figure 2 The embodiment 1 of the utility model discloses a top view structure schematic diagram;

[0021] Figure 3 The embodiment 1 of the utility model discloses a side view cross section structure schematic diagram;

[0022] Figure 4 The embodiment 1 of the utility model discloses a front view structure schematic diagram;

[0023] Figure 5 The embodiment 2 of the utility model discloses a side view cross section structure schematic diagram;

[0024] Figure 6 It is the three-dimensional space model of original river basin;

[0025] Figure 7 It is the whole streamline diagram;

[0026] Figure 8 It is liquid surface velocity nephogram;

[0027] Figure 9 It is the symmetric face velocity nephogram;

[0028] Figure 10 It is wall surface shear force cloud Figure 1 ;

[0029] Figure 11 It is wall surface shear force cloud Figure 2 ;

[0030] Figure 12 It is wall surface shear force cloud Figure 3 .

[0031] The reference numerals in the figure are as follows: 1-base plate; 2-inner frame; 21-first inner wall; 22-second inner wall; 23-third inner wall; 3-outer frame; 31-first outer wall; 32-second outer wall; 33-third outer wall; 4-first opening; 5-second opening; 6-first flow field improvement channel; 7-second flow field improvement channel; 8-third flow field improvement channel; 9-flow field improvement flange. Detailed Implementation

[0032] Example 1

[0033] This embodiment presents a combined current stabilizer, such as... Figures 1-2 As shown, the system includes a base plate 1, an inner frame 2 mounted on the base plate 1, and an outer frame 3 mounted on the base plate 1. The inner frame 2 includes a first inner sidewall 21, a second inner sidewall 22, and a third inner sidewall 23. The first inner sidewall 21 and the second inner sidewall 22 are two opposing sidewalls, and the third inner sidewall 23 is sealed to the first end of the first inner sidewall 21 and the first end of the second inner sidewall 22, respectively. The outer frame 3 includes a first outer sidewall 31, a second outer sidewall 32, and a third outer sidewall 33. The first outer sidewall 31 and the second outer sidewall 32 are two opposing sidewalls, and the third outer sidewall 33 is sealed to the first end of the first outer sidewall 31 and the first end of the second outer sidewall 32, respectively. The first inner sidewall 21... A first opening 4 is provided between the second end of the first inner wall 22 and the second end of the second inner wall 22, and a second opening 5 is provided between the second end of the first outer wall 31 and the second end of the second outer wall 32. The second ends of the first inner wall 21 and the second inner wall 22 enter the space between the first outer wall 31 and the second outer wall 32 through the second opening 5. A first flow field improvement channel 6 is formed between the first inner wall 21 and the first outer wall 31 and between the second inner wall 22 and the second outer wall 32. Molten steel in the inner frame 2 is fluidly connected to the first flow field improvement channel 6 through the second flow field improvement channel 7. Impact-resistant bricks can be installed on the base plate 1 within the range of the inner frame 2 to increase the service life of the flow stabilizer. In some other embodiments, the shapes of the inner frame 2 and the outer frame 3 can also be semi-closed arcs, semi-closed polygonal shapes, or semi-closed shapes formed by a combination of arcs and polygonal shapes.

[0034] The height of the third inner side wall 23 is greater than the height of the third outer side wall 33, and the third inner side wall 23 is 30-500 mm higher than the third outer side wall 33. The height difference can prevent the molten steel from directly splashing out of the flow stabilizer and reduce the impact on the ladle wall. In the embodiment, the height of the third inner side wall 23 is 390±4 mm, and the height of the third outer side wall 33 is 290±3 mm. The top of the first inner side wall 21 and the second outer side wall 32 is gradually inclined from the third inner side wall 23 to the third outer side wall 33, and the top of the first outer side wall 31 and the second outer side wall 32 is flush with the top of the first inner side wall 21. The angle between the first inner side wall 21 and the horizontal plane is 1-89°, preferably 12°.

[0035] In specific implementation, the size of the flow stabilizer can be determined according to the actual molten steel impact point and the size of the ladle. The distance between the first inner side wall 21 and the second inner side wall 22 is 100-1000 mm, the thickness of the bottom plate 1 is 40-400 mm, the wall thickness of the first inner side wall 21, the second inner side wall 22, the third inner side wall 23, the first outer side wall 31, the second outer side wall 32 and the third outer side wall 33 is 30-250 mm, and the first flow field improvement channel 6 is arranged on both sides of the inner vertical frame 2. The width of the first flow field improvement channel 6 is 30-500 mm. In the specific implementation, the thickness of the bottom plate 1 is 80 mm, the distance between the third outer side wall 33 and the third inner side wall 23 is 710±5 mm, the distance between the first outer side wall 31 and the second outer side wall 32 is 800±5 mm, the wall thickness of the first outer side wall 31 and the second outer side wall 32 is 35 mm, the thickness of the third outer side wall 33 gradually increases from the top to the bottom, the width of the top of the third outer side wall 33 is 105 mm, the width of the bottom of the third outer side wall 33 is 125 mm, the wall thickness of the first inner side wall 21 and the second inner side wall 22 is 55 mm, the wall thickness of the third inner side wall 23 is 45 mm, and the width of the first flow field improvement channel 6 is 80 mm and the length is 300 mm.

[0036] As Figure 1 , Figure 4As shown, the second flow field improvement channel 7 is a tapping hole opened on the first inner side wall 21 and the second inner side wall 22, that is, the second flow field improvement channel 7, which gradually inclines and rises upward from the inlet end to the outlet end, and in the plane perpendicular to the molten steel flow direction in the first flow field improvement channel 6: the angle between the axis of the tapping hole and the horizontal line is 15-25°, preferably 20°; in the overhead plane passing through the tapping hole: the axis of the tapping hole is perpendicular to the molten steel flow direction in the first flow field improvement channel 6; the diameter of the tapping hole is 65 mm, the distance from the inlet end of the tapping hole to the bottom plate 1 is 84 mm, and the distance from the inlet end of the tapping hole to the third inner side wall 23 is 389 mm. In this embodiment, the second end of the first inner side wall 21 and the second end of the second inner side wall 22 are respectively sealingly connected with the third outer side wall 33, that is, the inner stand 2 and the third outer side wall 33 combine to form a circumferentially closed space, and after the molten steel enters the circumferentially closed inner stand 2, it flows out from the tapping hole into the first flow field improvement channel 6.

[0037] Embodiment 2

[0038] This embodiment is a combined flow stabilizer, as shown in Figure 5 The difference between this embodiment and embodiment 1 is that the upper part of the second end vertical surface of the first inner side wall 21 is sealingly connected with the third outer side wall 33, and the lower part of the second end vertical surface of the first inner side wall 21 has a third flow field improvement channel 8 for guiding the molten steel in the inner stand 2 to the outside of the inner stand 2, which is in fluid communication with the first flow field improvement channel 6; the upper part of the second end vertical surface of the second inner side wall 22 is sealingly connected with the third outer side wall 33, and the lower part of the second end vertical surface of the second inner side wall 22 has a third flow field improvement channel 8 for guiding the molten steel in the inner stand 2 to the outside of the inner stand 2.

[0039] In this embodiment, only the upper part of the second end vertical surface of the first inner side wall 21 and the second end vertical surface of the second inner side wall 22 is connected with the third outer side wall 33, and there is a gap between the lower part of the second end vertical surface of the first inner side wall 21 and the second end vertical surface of the second inner side wall 22 and the third outer side wall 33 to form a third flow field improvement channel 8, so that the molten steel not only flows out from the tapping hole, but also flows out from the third flow field improvement channel 8, and the molten steel flowing out enters the first flow field improvement channel 6 to be divided and the flow field power is strengthened.

[0040] Embodiment 3

[0041] This embodiment is a combined flow stabilizer, as shown in Figure 3As shown in the figure, the second end of the first inner side wall 21 and the second end of the second inner side wall 22 are respectively in sealing connection with the third outer side wall 33, and the difference from the embodiment 1 is that no steel holes are opened on the first inner side wall 21 and the second inner side wall 22, and the second flow field improvement channel 7 is the space above the first inner side wall 21 and the second inner side wall 22, that is, the circumferentially closed space formed by the inner stand 2 and the third outer side wall 33, and the molten steel enters the circumferentially closed inner stand 2, and then flows out from the top of the first inner side wall 21 and the top of the second inner side wall 22 into the first flow field improvement channel 6, which can also play a role in strengthening the flow field power.

[0042] Embodiment 4

[0043] On the basis of the above-mentioned embodiments 1-3, the embodiment has a flow field improvement protruding edge 9 extending towards the third inner side wall 23 on the upper part of the third outer side wall 33 between the second end of the first inner side wall 21 and the second end of the second inner side wall 22, which plays a role in further improving the flow field power and enhancing the stirring effect on the molten steel. In some other embodiments, the upper part of the first outer side wall 31 also has a flow field improvement protruding edge 9 extending towards the first inner side wall 21; the upper part of the second outer side wall 32 has a flow field improvement protruding edge 9 extending towards the second inner side wall 22, and in actual implementation, the wall thickness of the flow field improvement protruding edge 9 is 45 mm and the width is 100 mm.

[0044] Tundish flow field simulation test using the combined flow stabilizer of the embodiment

[0045] I. The specific parameters of the test are shown in Table 1 below:

[0046] Table 1 Test Parameters

[0047] Name Parameter Billet size 1800-2500 mm x 250-400 mm Drawing speed 0.55 m / min ~ 1.2 m / min Long nozzle inner and outer diameter 80 mm / 145 mm Working liquid level 1050 mm Long nozzle insertion depth 200 mm ~ 300 mm

[0048] II. Simulation analysis

[0049] 2.1, CAD digital object modeling

[0050] The flow field is the calculation object of the space domain filled with fluid, so the CAD model is a complex geometry of the area filled with molten steel. Considering the symmetry of the flow field space, 1 / 2 of the flow field space is taken as the calculation object, and the symmetry surface is handled by numerical symmetry boundary. The original flow field three-dimensional space model is as shown in the figure. Figure 6

[0051] 2.2, CAE digital object modeling

[0052] The test object is divided into tetrahedral and hexahedral mixed grids, and the number of grids is about 1.6 million.

[0053] 2.3, CAE model ​

[0054] Stokes equation is used to describe the flow of liquid steel in the experiment. The finite volume method is used for calculation, and the Shear Stress Transport SST mathematical model is used to describe the turbulent flow characteristics of liquid steel. The optimized wall function is used to handle the near-wall turbulent flow.

[0055] 2.4, Boundary conditions

[0056] According to the service site conditions of the test object, the boundary conditions are set. For details, see the table below:

[0057] Table 2 Boundary conditions

[0058]

[0059]

[0060] Three, tundish liquid steel flow field results

[0061] In order to intuitively display the flow field results, streamline and vector diagrams are used to describe the calculation results, as follows:

[0062] 3.1, The overall streamline diagram is shown in Figure 7 .

[0063] 3.2, The liquid surface velocity cloud chart is shown in Figure 8 .

[0064] 3.3, The symmetric plane velocity cloud chart is shown in Figure 9 .

[0065] 3.4, The wall shear stress cloud Figure 1 is shown in Figure 10 .

[0066] 3.5, The wall shear stress cloud Figure 2 is shown in Figure 11 .

[0067] 3.6, The wall shear stress cloud Figure 3 is shown in Figure 12 .

[0068] Four, analysis of experimental results

[0069] 4.1, From the overall streamline diagram and the liquid surface velocity cloud chart, it can be seen that the liquid surface fluctuation of the flow stabilizer structure in this embodiment is small.

[0070] 4.2, From the wall shear stress cloud chart, it can be seen that the wall shear stress of the combined flow stabilizer in this embodiment is relatively uniform, mainly distributed on the inner wall and bottom surface of the flow stabilizer.

[0071] According to the experimental result analysis, the combined flow stabilizer design can reduce the scouring of the molten steel to the tundish wall, and has a great effect on improving the tundish life.

[0072] In summary, in the embodiment, the inner vertical frame 2 and the outer vertical frame 3 are combined by the change of height and shape, and by guiding the molten steel, when the flow stabilizer is placed in the tundish, the fluid dynamics can be effectively optimized, and the flow performance of the molten steel is improved. In addition, by reducing the dead volume inside the flow stabilizer, the floating of inclusions in the molten steel is effectively promoted, and the quality of the casting blank is improved.

[0073] Obviously, the above embodiments are only examples for clearly illustrating, but not limit the embodiments. For those skilled in the art, based on the above description, other different forms of changes or variations can also be made. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the patent application claims.

Claims

1. A combination flow straightener, characterized by, The utility model relates to a continuous casting machine's inner stand, including bottom plate (1), set up in bottom plate (1) inner stand (2) and set up in bottom plate (1) outer stand (3), the inner stand (2) includes first inner side wall (21), second inner side wall (22) and third inner side wall (23), first inner side wall (21) and second inner side wall (22) are two opposite side walls, and the first end of first inner side wall (21) and the first end of second inner side wall (22) are sealedly connected with third inner side wall (23) respectively, the outer stand (3) includes first outer side wall (31), second outer side wall (32) and third outer side wall (33), first outer side wall (31) and second outer side wall (32) are two opposite side walls, and the first end of first outer side wall (31) and the first end of second outer side wall (32) are sealedly connected with third outer side wall (33) respectively, The second end of first inner side wall (21) and the second end of second inner side wall (22) are provided with first opening (4) between, and the second end of first outer side wall (31) and the second end of second outer side wall (32) are provided with second opening (5) between, and the second end of first inner side wall (21) and the second end of second inner side wall (22) enter between first outer side wall (31) and second outer side wall (32) from second opening (5), First flow field improvement channel (6) is formed between first inner side wall (21) and first outer side wall (31) and / or between second inner side wall (22) and second outer side wall (32), and the molten steel in the inner stand (2) is fluidly communicated with first flow field improvement channel (6) through second flow field improvement channel (7).

2. A combination flow straightener according to claim 1, wherein Second flow field improvement channel (7) is a tapping hole opened in first inner side wall (21) and / or second inner side wall (22), and the tapping hole is second flow field improvement channel (7).

3. A combination flow straightener according to claim 2, wherein The tapping hole gradually inclines and rises from the inlet end to the outlet end.

4. A combination flow straightener according to claim 3, wherein On the plane perpendicular to the direction of molten steel flow in first flow field improvement channel (6), the angle between the axis of tapping hole and the horizontal line is 15-25 °, and on the overhead plane passing through the tapping hole, the axis of tapping hole is perpendicular to the direction of molten steel flow in first flow field improvement channel (6).

5. A combination flow straightener according to any one of claims 2 to 4, wherein The upper part of the second end vertical surface of first inner side wall (21) is sealedly connected with third outer side wall (33), and the lower part of the second end vertical surface of first inner side wall (21) has third flow field improvement channel (8) for guiding the molten steel in the inner stand (2) to the outside of inner stand (2) with third outer side wall (33), and third flow field improvement channel (8) is fluidly communicated with first flow field improvement channel (6).

6. A combination flow straightener according to claim 5, wherein The upper part of the second end vertical surface of second inner side wall (22) is sealedly connected with third outer side wall (33), and the lower part of the second end vertical surface of second inner side wall (22) has third flow field improvement channel (8) for guiding the molten steel in the inner stand (2) to the outside of inner stand (2) with third outer side wall (33).

7. A combination flow straightener according to any one of claims 2 to 4, wherein The second end of the first inner side wall (21) and the second end of the second inner side wall (22) are respectively in sealing connection with the third outer side wall (33).

8. The combination flow straightener of claim 1, wherein The second end of the first inner side wall (21) and the second end of the second inner side wall (22) are respectively in sealing connection with the third outer side wall (33), and the second flow field improvement channel (7) is a space above the first inner side wall (21) and / or the second inner side wall (22).

9. A combination flow straightener according to any one of claims 2 to 4, wherein The upper part of the third outer side wall (33) between the second end of the first inner side wall (21) and the second end of the second inner side wall (22) has a flow field improvement protruding edge (9) extending towards the third inner side wall (23).

10. A combination flow straightener according to any one of claims 2 to 4, wherein The upper part of the first outer side wall (31) has a flow field improvement protruding edge (9) extending towards the first inner side wall (21); and the upper part of the second outer side wall (32) has a flow field improvement protruding edge (9) extending towards the second inner side wall (22). The upper part of the first outer side wall (31) has a flow field improvement protruding edge (9) extending towards the first inner side wall (21); and the upper part of the second outer side wall (32) has a flow field improvement protruding edge (9) extending towards the second inner side wall (22).

Images