Bubble refining device for simulating electromagnetic stirring

Abstract

The utility model relates to a bubble refining device simulating electromagnetic stirring. The bubble refining device comprises a first frame body; the second frame body is arranged above the first frame body; the moving platform is arranged above the second frame body; the moving groove is formed in the moving platform; the baffle assembly penetrates through the moving groove and extends downwards. The glass container is arranged below the movable platform and is sleeved outside the baffle assembly; the driving machine is arranged below the glass container and is connected with the first frame body; the through hole is formed in the bottom of the glass container and connected with an external air source. The baffle assembly is arranged to move along the moving groove of the moving platform, the distance between the baffle assembly and the inner wall of the glass container is adjusted, then the flow velocity difference of liquid in the glass container is controlled, gas introduced into the glass container through the through hole generates bubbles, and the bubbles are refined and dispersed under the condition that the glass container is driven by the driver to rotate; furthermore, the flowing characteristics in the glass container under the electromagnetic stirring condition are simulated, and the refining and dispersing process of the bubbles can be observed conveniently.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic metallurgy technology, and in particular to a bubble refinement device that simulates electromagnetic stirring. Background Technology

[0002] Currently, methods that increase the flotation speed of inclusions using bubbles have achieved effective separation of tiny inclusions in molten steel. However, a key factor in removing inclusions smaller than 20 μm in the tundish using bubble collision and adhesion is increasing the collision probability between bubbles and inclusions. This requires the formation of small, dispersed bubbles within the tundish. Since mass transfer and reaction processes in gas-liquid agitation occur through bubbles, if the bubbles in the molten metal are generally large and concentrated, it is difficult to stably generate a sufficient quantity of fine, dispersed bubbles. This results in insufficient removal of micro-inclusions (smaller than 50 μm) and inadequate cleanliness of the molten steel. Therefore, bubble size and dispersion are crucial parameters, and research on bubble refinement and dispersion under electromagnetic stirring conditions is of significant importance.

[0003] To study the refinement and dispersion of bubbles during electromagnetic stirring, some existing technologies use low-melting-point metals. For example, mercury is used to simulate the flow behavior of molten steel under electromagnetic stirring conditions. However, because mercury is opaque, its internal movement cannot be observed, and the refinement and dispersion of bubbles cannot be observed, resulting in unsatisfactory simulation effects. Furthermore, low-melting-point metals are more expensive, increasing the cost of simulation, and the toxicity of mercury poses potential safety risks to experimenters. Utility model patent CN206697132U discloses an electromagnetic stirring experimental device for simulating the stirring process of molten steel. It visually presents the forward, reverse, and forward-reverse rotation of molten steel in the casting cavity during continuous casting rotary electromagnetic stirring technology using a metal rotating cylinder. However, this electromagnetic stirring experimental device can only simulate the flow effect of electromagnetic stirring; it still cannot demonstrate the internal flow characteristics of molten steel under electromagnetic stirring conditions, nor can it observe the refinement and dispersion process of bubbles.

[0004] Therefore, this utility model provides a bubble refinement device that simulates electromagnetic stirring. Utility Model Content

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a bubble refinement device for simulating electromagnetic stirring, thereby solving the technical problem that the prior art is not convenient to show the internal flow characteristics of molten steel and cannot observe the refinement and dispersion process of bubbles during the simulation of electromagnetic stirring.

[0006] To achieve the above objectives, this utility model provides a bubble refining device that simulates electromagnetic stirring, comprising: a first frame; a second frame disposed above the first frame; a moving platform disposed above the second frame; a moving groove formed in the moving platform; a baffle assembly passing through the moving groove and extending downward; a glass container disposed below the moving platform and fitted over the baffle assembly; a drive motor disposed below the glass container and connected to the first frame; and a through hole formed at the bottom of the glass container and connected to an external air source.

[0007] Optionally, there can be multiple moving slots, which are centrally symmetrically distributed on the moving platform.

[0008] Optionally, the baffle assembly includes: a baffle that passes through the moving platform via a moving slot; a fixing hole that is formed in the baffle; a fixing plate that is disposed on the side of the baffle and is connected to both the moving platform and the baffle; and a fixing bolt that passes through the fixing plate and is connected to the baffle via the fixing hole.

[0009] Optionally, the fixing holes can be set as elongated holes along the extension direction of the baffle.

[0010] Optionally, the baffle assembly may also include: a moving motor, mounted on the moving platform; and a worm gear, mounted in the moving slot and connected to the moving platform, the moving motor, and the baffle.

[0011] Optionally, the electrical control box is located on the side of the first frame and is electrically connected to the drive motor and the moving motor.

[0012] Optionally, a three-way valve is installed below the through hole and connected to an external air source via a pipeline; a water pump is installed on the side of the first frame and connected to the three-way valve via a pipeline.

[0013] The beneficial effects of this utility model are:

[0014] This invention provides a bubble refinement device that simulates electromagnetic stirring. By setting a baffle assembly to move along the moving groove of the moving platform, the distance between the baffle assembly and the inner wall of the glass container is adjusted, thereby controlling the flow rate difference of liquid at different positions in the glass container. Gas introduced into the glass container through the through hole generates bubbles. When the glass container is rotated by the drive motor, the bubbles in the liquid are refined and dispersed, thereby simulating the flow characteristics inside the glass container under electromagnetic stirring conditions, and making it easy to observe the bubble refinement and dispersion process.

[0015] Furthermore, by incorporating a baffle assembly, the distance between the baffle and the inner wall of the glass container can be adjusted, thereby simulating the flow effect of liquid at different electromagnetic frequencies.

[0016] Furthermore, the bubble refining device of this invention can generate turbulence in the liquid inside the glass container without contacting the liquid. By utilizing the breaking effect of turbulence, large bubbles are continuously broken into small bubbles, so that uniformly sized microbubbles are dispersed throughout the liquid. This prolongs the floating time of bubbles in the liquid, increases the probability of bubbles colliding with impurities, and improves the removal rate of impurities in the liquid, thereby improving the cleanliness of the liquid.

[0017] Furthermore, since this invention uses a drive motor to rotate the glass container, the liquid inside the glass container will swirl. The presence of the swirling flow avoids the "wall adhesion effect" of liquid bubbles (i.e., bubbles are adsorbed on the inner wall of the glass container and do not flow with the liquid). The dispersion of fine bubbles can also improve the removal efficiency of impurities in the liquid, thereby improving the effective utilization rate of bubbles and saving gas consumption. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the bubble refining device for simulating electromagnetic stirring according to the present invention.

[0019] Figure 2 This is a top view of the mobile platform and baffle assembly of this utility model;

[0020] Figure 3 This is a schematic diagram showing the baffle of this utility model installed inside a glass container;

[0021] Figure 4 In order to be in Figure 3 Schematic diagram of the cross section at point AA;

[0022] Figure 5 This is a schematic diagram of the structure of the baffle of this utility model;

[0023] Figure 6 This is a diagram showing the turbulent kinetic energy distribution of a liquid under different distances between the baffle and the inner wall of the glass container.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. First frame; 2. Second frame; 3. Moving platform; 4. Moving trough; 5. Baffle assembly; 51. Baffle; 52. Fixing hole; 53. Fixing plate; 54. Fixing bolt; 55. Moving motor; 56. Worm gear; 6. Glass container; 7. Drive motor; 8. Through hole; 9. Electrical control box; 10. Three-way valve; 11. Water pump; 12. Gas cylinder; 13. Screw hole. Detailed Implementation

[0026] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0027] An embodiment of this utility model provides a bubble refinement device that simulates electromagnetic stirring, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, it includes: a first frame 1; a second frame 2, disposed above the first frame 1; a moving platform 3, disposed above the second frame 2; a moving slot 4, formed in the moving platform 3; a baffle assembly 5, passing through the moving slot 4 and extending downward; a glass container 6, disposed below the moving platform 3 and fitted over the baffle assembly 5; a drive motor 7, disposed below the glass container 6 and connected to the first frame 1; and a through hole 8, formed at the bottom of the glass container 6 and connected to an external air source.

[0028] For example, for ease of description in this embodiment, the liquid near the inner wall of the glass container 6 is referred to as the surface liquid, and the liquid near the center of the glass container 6 is referred to as the central liquid. In actual electromagnetic stirring of molten steel, the stirred molten steel exhibits a "skin effect," meaning that when a changing electromagnetic field acts on the molten steel, eddy electric fields are generated inside the molten steel. As the frequency increases, the current tends to be distributed closer to the surface of the molten steel; that is, the closer to the surface, the greater the current density, while the actual current in the molten steel further away from the surface is smaller. Due to the "skin effect," the stirring of the molten steel is more concentrated on the surface layer, affecting the stirring effect of the electromagnetic field on the molten steel and improving the efficiency of bubble refinement and dispersion. On the one hand, when the glass container 6 begins to rotate, the part of the inner wall of the glass container 6 in contact with the liquid will cause the liquid to begin to rotate due to the viscous force of the liquid. This viscous force causes the liquid to gradually accelerate its rotation, and because there is also viscous force between liquid molecules, this rotation will gradually be transmitted from the surface liquid to the central liquid, eventually causing all the liquid to rotate. The force transmitted from the surface liquid to the central liquid has a similar force distribution to the "skin effect" of molten steel during actual electromagnetic stirring. The force increases closer to the inner wall of the glass container 6, thus effectively simulating the liquid flow effect of the "skin effect" and achieving the simulation of electromagnetically stirred molten steel. On the other hand, the higher the actual electromagnetic frequency, the more pronounced the "skin effect," meaning a greater velocity difference between the surface liquid and the central liquid. Therefore, this embodiment also includes a baffle assembly 5, which reduces the velocity of the central liquid and increases the velocity difference between the surface and central liquids, thereby better simulating the "skin effect" as the electromagnetic frequency increases. In summary, the bubble refinement device in this embodiment achieves the molten steel flow effect brought about by the "skin effect" during electromagnetic stirring, effectively refines and disperses the bubbles, and, because it is a glass container 6, facilitates the observation of the bubble refinement and dispersion effects.

[0029] For example, in this embodiment, the bubble refining device drives the glass container 6 to rotate via the drive motor 7, thereby rotating the liquid inside and achieving a non-invasive rotating flow (i.e., no stirring paddle or magnetic rotor is installed inside the glass container 6, and it is not mechanical stirring). Therefore, no additional impurities are introduced during the simulation process, avoiding interference with the cleanliness of the liquid.

[0030] For example, from Figure 6The turbulent kinetic energy distribution shows that after the addition of baffle 51, the turbulent kinetic energy within the rotating liquid changes significantly and becomes more uniformly distributed. The distance between baffle 51 and the inner wall of the glass container 6 is d. Furthermore, under the conditions of d = 0.005m and d = 0.015m, the turbulent kinetic energy distribution shows the same trend, both reaching a peak at d = 0.1m. As the distance between baffle 51 and the inner wall of the glass container 6 increases, the turbulent kinetic energy after the addition of baffle 51 exhibits a distribution that first increases and then decreases. Such turbulent kinetic energy changes are similar to the effect of actual electromagnetic stirring of molten steel. As the distance between the baffle 51 and the inner wall of the glass container 6 decreases, the force transmitted from the high-velocity liquid near the surface to the liquid in the center layer is blocked and interfered with by the baffle 51. This causes the high-speed rotating force to remain only in the surface liquid, thus increasing the velocity difference between the surface liquid and the liquid in the center layer. In the case of actual electromagnetic stirring of molten steel, the "skin effect" also increases with the increase of electromagnetic frequency. Therefore, the bubble refining device in this embodiment effectively simulates the flow effect of molten steel during electromagnetic stirring.

[0031] For example, such as Figure 3 As shown, the through hole 8 in this embodiment is located at the bottom center of the glass container 6, which facilitates the uniform refinement and dispersion of the bubbles generated by the gas injected through the through hole 8 by the rotating liquid and the baffle 51.

[0032] For example, in this embodiment, the drive motor 7 is a conventional motor, which is connected to a drive shaft via a transmission belt. The drive shaft is fixedly connected to the bottom of the glass container 6, thereby driving the glass container 6 to rotate. The specific connection method is prior art and is not further limited here.

[0033] In one possible embodiment, such as Figure 2 and Figure 4 As shown, there are multiple moving slots 4, which are centrally symmetrically distributed on the moving platform 3.

[0034] For example, in this embodiment, the glass container 6 has a square cross-section in the horizontal direction, and there are four moving slots 4. The angle between any two adjacent moving slots 4 is 90 degrees, that is, the four moving slots 4 are distributed in a "+" shape on the moving platform 3, making the four moving slots 4 centrally symmetrical. Furthermore, the center of symmetry of the four moving slots 4 coincides with the longitudinal centerline of the glass container 6 below in the vertical direction. This allows the four baffles 51 to be equidistant from the inner wall of the glass container 6 after moving along the moving slots 4. Specifically, the distance between the four baffles 51 and the inner wall of the glass container 6 is determined according to the actual simulation requirements and is not specifically limited here.

[0035] In one possible embodiment, such as Figure 1As shown, the baffle assembly 5 includes: a baffle 51, which passes through the moving platform 3 via the moving groove 4; a fixing hole 52, which is formed in the baffle 51; a fixing plate 53, which is disposed on the side of the baffle 51 and is connected to both the moving platform 3 and the baffle 51; and a fixing bolt 54, which passes through the fixing plate 53 and is connected to the baffle 51 via the fixing hole 52.

[0036] For example, in this embodiment, the fixing plate 53 is L-shaped. One side of the L-shaped fixing plate 53 is connected to the baffle 51 by a fixing bolt 54, and the other side of the L-shaped baffle 51 is fitted to the moving platform 3. The fixing bolt 54 first passes through the fixing plate 53, then through the fixing hole 52 on the baffle 51, and then cooperates with the nut to achieve a threaded connection. That is, through the cooperation of the fixing plate 53, the fixing bolt 54 and the nut, the baffle 51 passing through the fixing groove is firmly connected to the moving platform 3, ensuring the stability of the baffle 51 when the glass container 6 rotates, that is, the baffle 51 will not shake with the swirling of the liquid.

[0037] In one possible embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, along the extending direction of the baffle 51, the fixing hole 52 is set as an elongated hole.

[0038] For example, such as Figure 2 As shown, the baffle 51 is elongated, and the fixing hole 52 on the baffle 51 is also elongated. The fixing hole 52 is oriented in the same direction as the baffle 51. In this embodiment, the baffle 51 is vertically oriented, and the fixing hole 52 is also vertically oriented. When the tester loosens the fixing bolt 54, the tester can adjust the height of the baffle 51, thereby adjusting the depth to which the baffle 51 extends downward within the glass container 6. This allows the baffle 51 to simulate the flow state of the liquid and the effects of bubble refinement and dispersion at different depths within the liquid.

[0039] In one possible embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, the baffle assembly 5 also includes: a moving motor 55, which is mounted on the moving platform 3; and a worm gear 56, which is mounted in the moving groove 4 and is connected to the moving platform 3, the moving motor 55, and the baffle 51.

[0040] For example, the driving force is provided by the moving motor 55, which drives the worm 56 to move along the moving groove 4. Since the worm 56 is connected to the baffle 51, the baffle 51 moves along the moving groove 4, so that the distance between the baffle 51 and the inner wall of the glass container 6 can be adjusted according to the needs of the experiment, so as to better simulate the "skin effect" of electromagnetic stirring.

[0041] For example, when the distance between the baffle 51 and the inner wall of the glass container 6 is small, that is, when the baffle 51 is closer to the inner wall of the glass container 6, the baffle 51 blocks and interferes with the force transmitted from the high-speed rotating surface liquid to the low-speed rotating central liquid, thus failing to increase the flow rate of the central liquid, resulting in a large flow rate difference between the surface liquid and the central liquid. Correspondingly, the high-speed rotating liquid area is small, that is, simulating the state of high current density on the surface of the molten steel when the electromagnetic frequency is high, thus simulating the electromagnetic stirring effect when the electromagnetic frequency is high.

[0042] For example, when the distance between the baffle 51 and the inner wall of the glass container 6 is large, that is, when the baffle 51 is closer to the center of the glass container 6, the baffle 51 causes the high-speed rotating surface liquid to transfer a part of the force to the low-speed rotating central liquid. Since the rotation of the glass container 6 provides the driving force for the high-speed rotation of the liquid, the force of the high-speed rotation is transmitted from the inner wall of the glass container 6 to the position where the baffle 51 is set. This increases the flow rate of the central liquid and makes the flow rate difference between the surface liquid and the central liquid smaller. Correspondingly, the area of ​​high-speed rotating liquid expands, that is, it simulates the state where the current density is not only concentrated on the surface of the molten steel when the electromagnetic frequency is low, thus simulating the electromagnetic stirring effect when the electromagnetic frequency is low.

[0043] For example, a threaded hole 13 for the worm gear 56 is provided through the baffle 51 along its width direction, and multiple threaded holes 13 are provided at different heights of the baffle 51. This arrangement facilitates adjusting the depth of the baffle 51 extending into the glass container 6 by adjusting the worm gear 56 as it passes through the threaded holes 13 at different heights. Correspondingly, the inner wall of the threaded hole 13 on the baffle 51 is provided with a thread that matches the outer surface of the worm gear 56, facilitating the movement of the baffle 51 along the worm gear 56 within the moving groove 4 when the moving motor 55 drives the worm gear 56 to rotate. The specific connection and installation method of the worm gear 56 is prior art and is not specifically limited here.

[0044] In one possible embodiment, such as Figure 1 As shown, the electrical control box 9 is located on the side of the first frame 1 and is electrically connected to the drive motor 7 and the moving motor 55.

[0045] For example, the drive motor 7 is controlled by the electrical control box 9, causing the drive motor 7 to drive the glass container 6 to rotate forward, reverse, or both forward and reverse, thus simulating the state of electromagnetically driven intermediate package rotation. The moving motor 55 is controlled by the electrical control box 9, which in turn provides driving force to the worm gear 56, driving the worm gear 56 to move the baffle 51 along the moving groove 4.

[0046] In one possible embodiment, such as Figure 1As shown, a three-way valve 10 is located below the through hole 8 and is connected to an external air source via a pipeline; a water pump 11 is located on the side of the first frame 1 and is connected to the three-way valve 10 via a pipeline.

[0047] For example, by setting a three-way valve 10, the glass container 6 can be connected to the water pump 11. When the glass container 6 is connected to the water pump 11, water is injected into the glass container 6 through the water pump 11; or the glass container 6 can be connected to the gas cylinder 12. When the glass container 6 is connected to the gas cylinder 12, air is introduced into the water in the glass container 6 through the gas cylinder 12, thereby forming bubbles.

[0048] For example, the gas in cylinder 12 can be air, such as compressed air or oxygen; or it can be an inert gas, such as argon or nitrogen. In practice, only inert gases can be used as the gas source for electromagnetically stirred molten steel to avoid oxygen oxidizing the molten steel. However, the bubble refining device in this embodiment can use compressed air. Since compressed air is less expensive than inert gas, the experimental cost of simulating electromagnetically stirred molten steel is further reduced.

[0049] For example, in this embodiment, a drain valve is also provided between the three-way valve 10 and the water pump 11. When both the water pump 11 and the gas cylinder 12 are closed, the three-way valve 10 is adjusted to connect the glass container 6 and the water pump 11 side, and the drain valve is opened, which can quickly drain the liquid in the glass container 6, making it convenient to replace the liquid in the glass container 6.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0051] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A bubble refining device simulating electromagnetic stirring, characterized in that, include: First frame; The second frame is positioned above the first frame; The mobile platform is positioned above the second frame; A mobile slot is provided on the mobile platform; A baffle assembly passes through the movable groove and extends downward; A glass container is positioned below the mobile platform and fitted over the baffle assembly; A drive unit is located below the glass container and connected to the first frame. A through-hole is provided at the bottom of the glass container and connected to an external air source.

2. The bubble refining device for simulating electromagnetic stirring as described in claim 1, characterized in that, The number of the moving slots is multiple, and the multiple moving slots are centrally symmetrically distributed on the moving platform.

3. The bubble refining device for simulating electromagnetic stirring as described in claim 2, characterized in that, The baffle assembly includes: A baffle is installed on the mobile platform through the movable slot; Fixing holes are provided in the baffle; A fixing plate is disposed on the side of the baffle and is connected to both the moving platform and the baffle. A fixing bolt passes through the fixing plate and is connected to the baffle through the fixing hole.

4. The bubble refining device for simulating electromagnetic stirring as described in claim 3, characterized in that, Along the extending direction of the baffle, the fixing hole is configured as an elongated hole.

5. The bubble refining device for simulating electromagnetic stirring as described in claim 4, characterized in that, The baffle assembly further includes: A mobile motor is mounted on the mobile platform; The worm gear is disposed in the moving slot and is connected to the moving platform, the moving motor, and the baffle.

6. The bubble refining device for simulating electromagnetic stirring as described in claim 5, characterized in that, Also includes: The electrical control box is located on the side of the first frame and is electrically connected to the drive motor and the mobile motor.

7. The bubble refining apparatus for simulating electromagnetic stirring as described in any one of claims 1 to 6, characterized in that, Also includes: A three-way valve is located below the through hole and is connected to an external air source via a pipeline; A water pump is installed on the side of the first frame and connected to the three-way valve via a pipeline.

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