Immersed nozzle capable of preventing vortex

Abstract

The utility model relates to a submersed nozzle capable of preventing vortex. The submersed nozzle is mainly characterized by consisting of a nozzle main body (1), an inclined flow guide outlet (2), a fixed inner boss (3), a cross rectification opening (4) and a conical tapping hole (5). The rotational flow and turbulent flow state of a steel flow outlet can be effectively changed, the flow speed of the steel flow outlet is reduced, vortex slag entrapment is avoided, and the stable stream speed is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of refractory materials for steel and relates to an immersion nozzle for preventing eddy currents. Background Art

[0002] A submerged nozzle is a device used in the steelmaking and casting process, primarily for transferring molten metal from the tundish to the crystallizer. The design and use of submerged nozzles play an important role in controlling metal flow, reducing inclusions, and improving casting quality. Submerged nozzles generally adopt a multi-hole design at the bottom, meaning multiple small holes are designed at the end of the nozzle to disperse the metal flow. This design can reduce the impact force of the flow and lower the turbulence within the crystallizer. However, due to the small aperture of the small holes designed at the bottom of the submerged nozzle, the flow velocity of the steel flow at the bottom of the submerged nozzle increases, making it more likely to cause steel splashing. Furthermore, the impact strength of the steel flow increases with the increase in the outlet flow velocity, leading to vortices in the crystallizer flow field. The vortices will stir the protective slag, potentially causing vortex slag entanglement, which can lead to inclusion hazards in the billet and affect the quality of the cast billet. Summary of the Invention

[0003] In order to solve the above-mentioned problem, the present invention uses a new type of eddy current-preventing submerged nozzle, which mainly consists of a nozzle body (1), an inclined diversion outlet (2), a fixed inner boss (3), a cross-rectifier (4), and a conical steel outlet (5). The nozzle body (1) is 1000mm-2000mm long, and an inclined diversion outlet (2) is set 200mm-500mm away from the bottom end of the nozzle body (1). The number of inclined diversion outlets (2) is 2-4, and the cross section of the inclined diversion outlet (2) is an inverted arc rectangle. The length of the rectangle ranges from 200mm to 600mm, the arc chamfer angle is 5°-15°, and the angle between the cross section plane of the inclined diversion outlet (2) and the cross section of the nozzle body (1) is 5°-10°. 3-4 fixed inner bosses (3) are arranged on the inner bottom surface of the nozzle body (1), the fixed inner bosses (3) have a height of 50mm-200mm and a width of 50mm-150mm, the upper end surface of the fixed inner bosses (3) forms an angle of 10-15° with the horizontal, a cross-rectifier (4) is arranged on the lower end surface of the nozzle body (1), a conical steel outlet (5) is arranged at the center of the cross-rectifier (4), the conical steel outlet (5) passes through the fixed inner bosses (3), and the taper of the conical steel outlet (5) is 3°-8°.

[0004] When the molten steel passes through the fixed inner boss, due to the effect of gravity, a stable flat flow is formed in the bottom area of ​​the nozzle, which can effectively control the outflow speed of the molten steel. The molten steel with a consistent speed flows out through the inclined guide outlet and forms multiple stable streams, quickly dispersing the molten steel in the crystallizer flow field. The cross rectifier and the conical outlet (5) can ensure the reduction and stabilization of the stream speed. The function of the conical outlet is to effectively reduce the outlet steel flow speed by changing the outlet radius of the steel flow; the cross rectifier can effectively change the vortex turbulence state of the steel flow outlet, reduce the outlet flow speed of the steel flow, and avoid vortex slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 This is a front view of an immersed nozzle for preventing vortex, where 1 is the nozzle body and 2 is the inclined diversion outlet.

[0006] Figure 2 This is a front view cross-sectional view of an immersed nozzle for preventing vortex, where 2 is an inclined diversion outlet, 3 is a fixed inner boss, and 5 is a conical steel outlet.

[0007] Figure 3 This is a top-down cross-sectional view of the bottom of an immersed nozzle for preventing vortex flow, where 4 is a cross-rectifier nozzle and 5 is a conical steel outlet. DETAILED DESCRIPTION Example

[0008] A submerged nozzle for preventing eddy current mainly comprises a nozzle body (1), an inclined diversion outlet (2), a fixed inner boss (3), a cross-rectifier (4), and a conical steel outlet (5). The nozzle body (1) is 1100 mm long, and an inclined diversion outlet (2) is provided 300 mm from the bottom end of the nozzle body (1). There are four inclined diversion outlets (2). The cross section of the inclined diversion outlet (2) is an inverted arc rectangle with a length range of 220 mm and a width of 80 mm. The arc chamfer angle is 5°, and the angle between the cross section plane of the inclined diversion outlet (2) and the cross section of the nozzle body (1) is 5°. Four fixed inner bosses (3) are provided on the inner bottom surface of the nozzle body (1). The height of the fixed inner bosses (3) is 150 mm. The upper end surface of the fixed inner bosses (3) forms an angle of 10° with the horizontal. A cross-rectifier (4) is provided on the lower end surface of the nozzle body (1). A conical steel outlet (5) is provided at the center of the cross-rectifier (4). The conical steel outlet (5) passes through the fixed inner bosses (3). The taper of the conical steel outlet (5) is 3°.

[0009] Example

[0010] A submerged nozzle for preventing eddy current mainly comprises a nozzle body (1), an inclined diversion outlet (2), a fixed inner boss (3), a cross-flow rectifier (4), and a conical steel outlet (5). The nozzle body (1) is 1100 mm long, and an inclined diversion outlet (2) is provided 300 mm from the bottom end of the nozzle body (1). The inclined diversion outlets (2) are provided in four numbers. The cross section of the inclined diversion outlets (2) is an inverted arc rectangle, the rectangle has a length range of 200 mm, the arc chamfer angle is 5°, and the angle between the cross section plane of the inclined diversion outlet (2) and the cross section of the nozzle body (1) is 5°. Four fixed inner bosses (3) are arranged on the inner bottom surface of the nozzle body (1). The height of the fixed inner bosses (3) is 100 mm. The upper end surface of the fixed inner bosses (3) forms an angle of 10° with the horizontal. A cross-rectifier (4) is arranged on the lower end surface of the nozzle body (1). A conical steel outlet (5) is arranged at the center of the cross-rectifier (4). The conical steel outlet (5) passes through the fixed inner bosses (3). The taper of the conical steel outlet (5) is 3°.

[0011] Example

[0012] A submerged nozzle for preventing eddy current mainly comprises a nozzle body (1), an inclined diversion outlet (2), a fixed inner boss (3), a cross-rectifier (4), and a conical steel outlet (5). The nozzle body (1) is 1100 mm long, and an inclined diversion outlet (2) is provided 300 mm from the bottom end of the nozzle body (1). The inclined diversion outlets (2) are provided in four numbers. The cross section of the inclined diversion outlets (2) is an inverted arc rectangle, the rectangle has a length range of 200 mm, the arc chamfer angle is 5°, and the angle between the cross section plane of the inclined diversion outlet (2) and the cross section of the nozzle body (1) is 5°. Four fixed inner bosses (3) are provided on the inner bottom surface of the nozzle body (1). The fixed inner bosses (3) are 200 mm high and their upper end faces are angled 10° with the horizontal. A cross-shaped rectifier (4) is provided on the lower end surface of the nozzle body (1). A conical steel outlet (5) is provided at the center of the cross-shaped rectifier (4). The conical steel outlet (5) passes through the fixed inner bosses (3) and has a taper of 3°. Table 1 lists the properties of Example 3.

Claims

1. An immersion nozzle for preventing eddy current, characterized in that The invention comprises a nozzle body (1), an inclined guide outlet (2), a fixed inner boss (3), a cross rectifier (4), and a conical steel outlet (5), wherein the nozzle body (1) is 1000-2000 mm long, an inclined guide outlet (2) is set 200-500 mm from the bottom end of the nozzle body (1), the inclined guide outlet (2) is set in number 2-4, the cross section of the inclined guide outlet (2) is an inverted arc rectangle, the length of the rectangle ranges from 200 mm to 600 mm, the inverted angle of the arc is 5°-15°, and the cross section plane of the inclined guide outlet (2) is cut with the nozzle body (1). The surface angle is 5°-10°, 3-4 fixed inner bosses (3) are arranged on the inner bottom surface of the nozzle body (1), the fixed inner bosses (3) have a height of 50mm-200mm and a width of 50mm-150mm, the upper end surface of the fixed inner bosses (3) forms an angle of 10-15° with the horizontal, a cross rectifier (4) is arranged on the lower end surface of the nozzle body (1), a conical steel outlet (5) is arranged at the center of the cross rectifier (4), the conical steel outlet (5) passes through the fixed inner bosses (3), and the taper of the conical steel outlet (5) is 3°-8°.

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