Submersed nozzle

Abstract

The utility model belongs to the technical field of steel, and relates to a submersed nozzle which comprises a nozzle body, the nozzle body comprises a molten steel inlet end and a molten steel discharge end, a plurality of water outlets are formed in the tail end of the molten steel discharge end, the water outlets are strip-shaped openings and are located on the same straight line, the straight line is marked as a first straight line, and the second straight line is marked as a second straight line. The water outlets are symmetrical about the first straight line; the water outlets are integrally centrosymmetric; and each water outlet integrally forms a structure with a wide middle part and two narrow ends. According to the utility model, the possibility of slag entrapment on the liquid level is reduced, and the quality of casting blanks is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel and iron, and relates to an immersion type nozzle. Background Art

[0002] The submerged nozzle is a refractory sleeve installed at the bottom of the tundish in continuous steel casting equipment and inserted below the molten steel level of the crystallizer. The main function of the submerged nozzle is to prevent secondary oxidation of the tundish injection flow and splashing of molten steel.

[0003] The end of the molten steel discharge end of the existing submerged nozzle is usually equipped with several outlets, each outlet usually adopts a double round head long mouth, and the width of each double round head long mouth is the same. When in use, the molten steel flows out from the outlet of the submerged nozzle. With the acceleration of the continuous casting production rhythm, the continuous casting speed continues to increase, the steel flow rate of the submerged nozzle increases, the flow rate of the molten steel flowing out of the outlet increases, and thus the flow rate of the molten steel in the crystallizer increases.

[0004] When each outlet of the submerged nozzle is a double round-headed long mouth and each outlet has the same width, after the continuous casting speed is increased, it is easy to cause the liquid surface flow rate of the molten steel in the crystallizer to increase, which tends to increase the possibility of the protective slag on the liquid surface being drawn into the molten steel, that is, it tends to increase the possibility of slag rolling on the liquid surface. The slag rolling on the liquid surface easily leads to the deterioration of the quality of the billet shell in the crystallizer, and is prone to forming defects such as cracks, resulting in reduced billet quality. This is the shortcoming of the existing technology. Utility Model Content

[0005] The utility model aims to design an immersion nozzle to reduce the possibility of slag rolling on the liquid surface and improve the quality of the casting ingot in view of the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An immersion nozzle comprises a nozzle body, the nozzle body comprises a molten steel inlet end and a molten steel discharge end, the end of the molten steel discharge end is provided with a plurality of water outlets, each of the water outlets is a long strip-shaped opening, each of the water outlets is located on the same straight line, the straight line is recorded as a first straight line, and each of the water outlets is symmetrical about the first straight line;

[0008] Each water outlet is symmetrical in its entirety;

[0009] Each water outlet has an overall structure that is wide in the middle and narrow at both ends.

[0010] Further, each water outlet integrally forms a water outlet row;

[0011] The water outlets at both ends of the water outlet row are the first water outlet and the second water outlet, the second water outlet adopts a structure symmetrical to the first water outlet, and the first water outlet is any one of the following first elongated outlet, second elongated outlet, third elongated outlet, and fourth elongated outlet;

[0012] The first long strip opening: The first long strip opening is an oblong opening with unequal diameters at both ends;

[0013] Second long strip opening: The second long strip opening is a double round-headed long strip opening, the two ends of which are semicircular openings with different diameters, and a number of equal-diameter portions and a number of reduced-diameter portions are provided between the two semicircular openings;

[0014] The third long strip opening: the third long strip opening is a rounded isosceles trapezoid opening, and the height direction of the rounded isosceles trapezoid is the length direction of the third long strip opening;

[0015] The fourth elongated opening: The fourth elongated opening is a rounded isosceles trapezoidal opening, the height direction of the rounded isosceles trapezoid is the length direction of the fourth elongated opening, and the two sides of the rounded isosceles trapezoid include a number of horizontal portions and a number of inclined portions.

[0016] Further, let N be the number of water outlets between the first water outlet and the second water outlet in the water outlet row, and the value range of N is N≥0 and N is an integer.

[0017] Further, N=0, the first water outlet and the second water outlet are adjacent to each other at the ends with larger widths.

[0018] Further, N>0 and N is an even number, the water outlet located between the first water outlet and the second water outlet in the water outlet row adopts the same outlet structure as any m types of water outlets among the first long strip opening, the second long strip opening, the third long strip opening, the fourth long strip opening or the double round-headed long opening with equal diameters at both ends, and the water outlet located between the first water outlet and the second water outlet in the water outlet row is symmetrical about the perpendicular bisector of the water outlet row as a whole, 1≤m≤N / 2, m is an integer.

[0019] Furthermore, N>0 and N is an odd number, the water outlet located between the first water outlet and the second water outlet in the water outlet row is recorded as the middle water outlet;

[0020] The middle water outlet located at the middle position of the water outlet row adopts a double round-headed long mouth with equal diameters at both ends, and the water outlet is symmetrical about the median perpendicular line of the water outlet row;

[0021] The remaining intermediate water outlets adopt the same outlet structure as the first long strip outlet, the second long strip outlet, the third long strip outlet, the fourth long strip outlet or any q types of water outlet structures among the double round-headed long outlets with equal diameters at both ends. The remaining intermediate water outlets are symmetrical about the perpendicular bisector of the water outlet row as a whole, 1≤q≤(N-1) / 2, q is an integer.

[0022] Further, each water outlet integrally forms a water outlet row;

[0023] Each outlet of the water outlet row adopts a double round head long mouth with equal diameters at both ends;

[0024] The width of each water outlet decreases from the middle position of the water outlet row to both ends;

[0025] The water outlets are symmetrical about the perpendicular median of the water outlet row as a whole.

[0026] Furthermore, the orthographic projection of the end face of the molten steel discharge end is an oblong shape;

[0027] Each water outlet is located in the middle of the end surface of the molten steel discharge end;

[0028] The arrangement direction of each water outlet is located in the length direction of the oblong shape.

[0029] It can be seen from the above technical solutions that the utility model has the following advantages:

[0030] 1. The terminal end of the molten steel discharge end of the submerged nozzle proposed by the utility model is provided with a plurality of water outlets, and the plurality of water outlets form a structure that is wide in the middle and narrow at both ends as a whole, which helps to increase the circulation diameter of the molten steel flow field in the crystallizer, thereby being able to reduce the molten steel liquid surface flow velocity in the crystallizer to a certain extent, and helps to reduce the problem of slag rolling in the billet shell caused by the high molten steel liquid surface flow velocity, thereby helping to reduce defects such as cracks, improve the quality of the casting, and improve production stability.

[0031] 2. In addition, when the continuous casting speed is increased, several water outlets form a structure that is wide in the middle and narrow at both ends, which can increase the material thickness of the edges on both sides of the molten steel discharge end of the submerged nozzle, help improve the submerged nozzle's resistance to erosion by molten steel, increase the service life of the submerged nozzle, and increase the number of continuous casting furnaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the following drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the orthographic projection structure of the end face of the molten steel discharge end of an embodiment of the immersion nozzle described in the utility model.

[0034] Figure 2 It is a schematic diagram of the orthographic projection structure of the end face of the molten steel discharge end of another embodiment of the immersion nozzle described in the utility model.

[0035] Figure 3 It is a schematic diagram of the orthographic projection structure of the end face of the molten steel discharge end of another embodiment of the immersion nozzle described in the utility model.

[0036] Figure 4 It is a schematic diagram of the orthographic projection structure of the end face of the molten steel discharge end of another embodiment of the immersion nozzle described in the utility model.

[0037] Figure 5 It is a schematic diagram of the orthographic projection structure of the end face of the molten steel discharge end of another embodiment of the immersion nozzle described in the utility model.

[0038] Figure 6 It is a schematic diagram of the orthographic projection structure of the end face of the molten steel discharge end of another embodiment of the immersion nozzle described in the utility model.

[0039] Figure 7 for Figure 1 Schematic diagram of the molten steel flow field trajectory formed by the outlet shown.

[0040] Figure 8 Schematic diagram of the molten steel flow field trajectory formed by equal-width outlets.

[0041] Among them: 1-molten steel discharge end, 2-water outlet, 3-first upper circulation, 4-second upper circulation. DETAILED DESCRIPTION

[0042] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0043] The utility model aims to provide an immersion nozzle for continuous steel casting equipment.

[0044] The immersion nozzle provided by the utility model comprises a nozzle body, which comprises a molten steel inlet end and a molten steel discharge end. The terminal end of the molten steel discharge end is provided with a plurality of water outlets, each of which is a long strip-shaped outlet. Each of the water outlets is located on the same straight line, which is recorded as a first straight line, and each of the water outlets is symmetrical about the first straight line.

[0045] Each water outlet is centrally symmetrical as a whole.

[0046] Each water outlet has an overall structure that is wide in the middle and narrow at both ends.

[0047] Before use, the molten steel discharge end of the submerged nozzle is extended into the crystallizer, and the molten steel inlet end of the submerged nozzle is kept outside the crystallizer.

[0048] When in use, molten steel flows in from the molten steel inlet end of the immersion nozzle, then enters the molten steel discharge end, and finally flows out from each outlet and enters the crystallizer.

[0049] After molten steel flows into the crystallizer from the water outlet, a molten steel flow field will be formed in the crystallizer. Compared with the prior art in which each water outlet is a double-round-headed long mouth with the same width, when several water outlets form a structure that is wide in the middle and narrow at both ends as a whole, the diameter of the upper circulation of the molten steel flow field in the crystallizer can be increased, thereby reducing the liquid surface flow rate of the molten steel in the crystallizer, which helps to reduce defects such as slag rolling and cracks in the billet shell caused by the high liquid surface molten steel flow rate, and can improve the quality of the casting and production stability.

[0050] In addition, when the continuous casting speed is increased, the erosion of the surface of the submerged nozzle by the molten steel increases, and the erosion of the two sides near the molten steel discharge end, that is, the edge side, is even greater. When several outlets form a structure with a wide middle and narrow ends as a whole, the material thickness at both ends of the molten steel discharge end of the submerged nozzle can be increased, which helps to improve the erosion resistance of the submerged nozzle to molten steel erosion, increase the service life of the submerged nozzle, and increase the number of continuous casting furnaces.

[0051] Preferably, the water outlets integrally form a water outlet row.

[0052] The water outlets at both ends of the water outlet row are the first water outlet and the second water outlet. The second water outlet adopts a structure symmetrical to the first water outlet. The first water outlet is any one of the following first elongated outlet, second elongated outlet, third elongated outlet, and fourth elongated outlet.

[0053] The first elongated opening: The first elongated opening is an elongated circular opening with unequal diameters at both ends.

[0054] The second elongated mouth: The second elongated mouth is a double round-headed elongated mouth, and both ends of the double round-headed elongated mouth are semicircular mouths with unequal diameters, and a number of equal-diameter parts and a number of reduced-diameter parts are arranged between the two semicircular mouths.

[0055] The third long strip opening: The third long strip opening is a rounded isosceles trapezoidal opening, and the height direction of the rounded isosceles trapezoidal opening is the length direction of the third long strip opening.

[0056] The fourth elongated opening: The fourth elongated opening is a rounded isosceles trapezoidal opening, the height direction of the rounded isosceles trapezoid is the length direction of the fourth elongated opening, and the two sides of the rounded isosceles trapezoid include a number of horizontal portions and a number of inclined portions.

[0057] It should be noted that the two ends of the first elongated opening are semicircular openings, the diameters of the two semicircular openings are different, there is a reducing portion between the two semicircular openings, the width of the part where the reducing portion connects with the semicircular opening is the same as the diameter of the semicircular opening, and the width of the reducing portion gradually decreases from the semicircular opening with a larger diameter to the semicircular opening with a smaller diameter.

[0058] The two ends of the second long strip opening are semicircular openings, the diameters of the two semicircular openings are unequal, and between the two semicircular openings are a number of equal diameter portions and a number of reduced diameter portions that are alternately distributed. The width of the portion where the equal diameter portion or the reduced diameter portion connects with the two semicircular openings is the same as the diameter of the semicircular opening, the width of the portion where the equal diameter portion and the reduced diameter portion connect is the same, and the width of each reduced diameter portion gradually decreases from the semicircular opening with a larger diameter to the semicircular opening with a smaller diameter.

[0059] The fourth long strip opening is a rounded isosceles trapezoid opening. The two sides of the rounded isosceles trapezoid include a number of horizontal portions and a number of inclined portions. The horizontal portions of the two sides are perpendicular to the upper and lower bases of the rounded isosceles trapezoid, and the inclined portions are inclined from the lower base toward the upper base.

[0060] Preferably, the number of water outlets located between the first water outlet and the second water outlet in the water outlet row is N, and the value range of N is N≥0 and N is an integer.

[0061] Exemplarily, N=0, and the first water outlet is adjacent to the end with the larger width of the second water outlet.

[0062] It can be understood that, when N=0, the water outlet row includes a first water outlet and a second water outlet.

[0063] The position where the symmetry center of the water outlet row is located is the center side, and the positions where the two ends of the water outlet row are located are the edge sides. When the first water outlet and the second water outlet are the first long strip outlets, the formed water outlet row is as follows: Figure 1 As shown, the diameter of the semicircular opening on the edge side of the water outlet 2 is K1, and the diameter of the semicircular opening on the center side is K2, K1<K2.

[0064] When the first water outlet and the second water outlet are second elongated openings, and there is a constant diameter portion and a variable diameter portion between the two semicircular openings, the water outlet arrangement formed is as follows: Figure 2 As shown, the equal diameter part of each water outlet 2 is connected with the semicircular opening with a larger diameter, the width of the equal neck of the connecting part is the same as the diameter of the semicircular opening, both are K5, the equal neck and the reducing diameter part of the connecting part are the same in width, both are K4, the width of the reducing diameter part gradually decreases, the reducing diameter part is connected with the semicircular opening with a smaller diameter, the width of the reducing diameter part of the connecting part is the same as the diameter of the semicircular opening, both are K3, K3<K4=K5.

[0065] When the first water outlet and the second water outlet are the third elongated outlet, the formed water outlet arrangement is as follows: Figure 3As shown, the upper base of each water outlet 2 is located at the edge side, with a width of K6, and the lower base is located at the center side, with a width of K7, K6<K7.

[0066] When the first water outlet and the second water outlet are the fourth elongated outlets, and the two sides of the rounded isosceles trapezoid include a horizontal portion and an inclined portion, the formed water outlet arrangement is as follows: Figure 4 As shown, the horizontal portion of each water outlet 2 is connected to the lower bottom, and has a width of K10. The horizontal portion and the inclined portion have the same width as the inclined portion at the connecting portion, both of which are K9. The width of the inclined portion gradually decreases from the lower bottom to the upper bottom. The inclined portion is connected to the upper bottom, and the width of the inclined portion of the connecting portion is the same as that of the upper bottom, both of which are K8, and K8<K9=K10.

[0067] It can be understood that the first elongated opening is wedge-shaped. Figure 1 The two water outlets 2 shown are both wedge-shaped outlets.

[0068] After the molten steel flows into the crystallizer from the outlet 2, a molten steel flow field is formed in the crystallizer. Figure 1 The outlet 2 shown in the figure is used as an example to verify the effect of the submerged water nozzle proposed by the utility model, and compared with the double round head long mouth (the two ends of the double round head long mouth are equal in width, hereinafter referred to as "equal width outlet") with the same wedge-shaped outlet area as the present embodiment in the prior art. In this embodiment, K1 = 30mm, K2 = 50mm. The molten steel flow field traces of the molten steel flowing into the crystallizer from the wedge-shaped outlet and the equal width outlet under the same process conditions are shown in the figure below. Figure 7 and Figure 8 As shown, Figure 7 Corresponding to the wedge-shaped outlet, Figure 8 Corresponding to equal width exit. Figure 7 and Figure 8 It can be seen that when the water outlet is a wedge-shaped outlet, the diameter of the first upper circulation 3 of the molten steel flow field in the crystallizer is significantly larger than the diameter of the second upper circulation 4 corresponding to the equal-width outlet, which verifies that when a number of water outlets 2 form a structure that is wide in the middle and narrow at both ends, the liquid surface flow rate of the molten steel in the crystallizer can be reduced, which helps to reduce defects such as slag rolling and cracks in the billet shell caused by the high liquid surface molten steel flow rate, and can improve the quality of the casting and production stability.

[0069] Exemplarily, N>0 and N is an even number, the water outlet 2 located between the first water outlet and the second water outlet in the water outlet row adopts the same water outlet 2 as any m types of water outlet structures among the first long strip opening, the second long strip opening, the third long strip opening, the fourth long strip opening or the double round-headed long opening with equal diameters at both ends, and the water outlet 2 located between the first water outlet and the second water outlet in the water outlet row is symmetrical about the perpendicular bisector of the water outlet row as a whole, 1≤m≤N / 2, m is an integer.

[0070] When N=2, the first water outlet and the second water outlet are first long strip outlets, and the two middle water outlets 2 are double round head long outlets with equal diameters at both ends. Figure 5 As shown, the width of the two middle water outlets 2 is K13, the diameter of the semicircular opening of the two water outlets 2 on both sides is K12, and the diameter of the semicircular opening of the smaller diameter is K11, K11<K12<K13.

[0071] Exemplarily, N>0 and N is an odd number, and the water outlet 2 located between the first water outlet and the second water outlet in the water outlet row is recorded as the middle water outlet.

[0072] The middle water outlet located at the middle position of the water outlet row adopts a double round-headed long opening with equal diameters at both ends, and the water outlet 2 is symmetrical about the median perpendicular line of the water outlet row.

[0073] The remaining intermediate water outlets adopt a water outlet 2 with the same structure as any q types of water outlets 2 among the first long strip opening, the second long strip opening, the third long strip opening, the fourth long strip opening or the double round-headed long opening with equal diameters at both ends. The remaining intermediate water outlets are symmetrical about the perpendicular bisector of the water outlet row as a whole, 1≤q≤(N-1) / 2, q is an integer.

[0074] Exemplarily, the water outlets 2 as a whole form a water outlet row.

[0075] Each water outlet 2 of the water outlet row adopts a double round-headed long opening with equal diameters at both ends.

[0076] The width of each water outlet 2 decreases from the middle position of the water outlet row to both ends.

[0077] The water outlets 2 are symmetrical about the perpendicular midline of the water outlet row as a whole.

[0078] When the outlet row has four double round-headed long openings with equal diameters, the outlet row formed is as follows: Figure 6 As shown, the width of the two middle water outlets 2 is K15, and the width of the two water outlets 2 on both sides is K14, and K14<K15.

[0079] Preferably, the orthographic projection of the end surface of the molten steel discharge end 1 is an oblong shape.

[0080] Each water outlet 2 is located as a whole at the middle position of the end surface of the molten steel discharge end 1.

[0081] The arrangement direction of the water outlets 2 is located in the length direction of the oblong shape.

[0082] The above disclosure is only the preferred implementation mode of the utility model, but the utility model is not limited thereto. Any non-creative changes that can be thought of by technicians in this field, as well as several improvements and modifications made without departing from the principle of the utility model, should fall within the scope of protection of the utility model.

Claims

1. An immersion nozzle, comprising a nozzle body, the nozzle body comprising a molten steel inlet end and a molten steel discharge end, the terminal end of the molten steel discharge end is provided with a plurality of water outlets, characterized in that: Each water outlet is a long strip-shaped outlet, and each water outlet is located on the same straight line, which is recorded as the first straight line, and each water outlet is symmetrical about the first straight line; Each water outlet is symmetrical in its entirety; Each water outlet has an overall structure that is wide in the middle and narrow at both ends.

2. The submerged nozzle according to claim 1, characterized in that: The water outlets collectively form a water outlet row; The water outlets at both ends of the water outlet row are the first water outlet and the second water outlet, the second water outlet adopts a structure symmetrical to the first water outlet, and the first water outlet is any one of the following first elongated outlet, second elongated outlet, third elongated outlet, and fourth elongated outlet; The first long strip opening: The first long strip opening is an oblong opening with unequal diameters at both ends; Second long strip opening: The second long strip opening is a double round-headed long strip opening, the two ends of which are semicircular openings with different diameters, and a number of equal-diameter portions and a number of reduced-diameter portions are provided between the two semicircular openings; The third long strip opening: the third long strip opening is a rounded isosceles trapezoid opening, and the height direction of the rounded isosceles trapezoid is the length direction of the third long strip opening; The fourth elongated opening: The fourth elongated opening is a rounded isosceles trapezoidal opening, the height direction of the rounded isosceles trapezoid is the length direction of the fourth elongated opening, and the two sides of the rounded isosceles trapezoid include a number of horizontal portions and a number of inclined portions.

3. The submerged nozzle according to claim 2, characterized in that: The number of the water outlets between the first water outlet and the second water outlet in the water outlet row is N, and the value range of N is N≥0 and N is an integer.

4. The submerged nozzle according to claim 3, characterized in that: N=0, the first water outlet is adjacent to the end with the larger width of the second water outlet.

5. The submerged nozzle according to claim 3, characterized in that: N>0 and N is an even number, the water outlet located between the first water outlet and the second water outlet in the water outlet row adopts the same outlet structure as any m types of water outlets among the first long strip opening, the second long strip opening, the third long strip opening, the fourth long strip opening or the double round-headed long opening with equal diameters at both ends, and the water outlet located between the first water outlet and the second water outlet in the water outlet row is symmetrical about the perpendicular bisector of the water outlet row as a whole, 1≤m≤N / 2, m is an integer.

6. The submerged nozzle according to claim 3, characterized in that: N>0 and N is an odd number, the outlet located between the first outlet and the second outlet in the outlet row is recorded as the middle outlet; The middle water outlet located at the middle position of the water outlet row adopts a double round-headed long mouth with equal diameters at both ends, and the water outlet is symmetrical about the median perpendicular line of the water outlet row; The remaining intermediate water outlets adopt the same outlet structure as the first long strip outlet, the second long strip outlet, the third long strip outlet, the fourth long strip outlet or any q types of water outlet structures among the double round-headed long outlets with equal diameters at both ends. The remaining intermediate water outlets are symmetrical about the perpendicular bisector of the water outlet row as a whole, 1≤q≤(N-1) / 2, q is an integer.

7. The submerged nozzle according to claim 1, characterized in that: The water outlets collectively form a water outlet row; Each outlet of the water outlet row adopts a double round head long mouth with equal diameters at both ends; The width of each water outlet decreases from the middle position of the water outlet row to both ends; The water outlets are symmetrical about the perpendicular median of the water outlet row as a whole.

8. The submerged nozzle according to claim 1, characterized in that: The orthographic projection of the end face of the molten steel discharge end is an oblong shape; Each water outlet is located in the middle of the end surface of the molten steel discharge end; The arrangement direction of each water outlet is located in the length direction of the oblong shape.

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