A composite magnetic field electromagnetic stirring device
Patent Information
- Application Number
- CN202522134015.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-10
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-10-10
AI Technical Summary
[0002]在钢铁或有色金属凝固过程中，特别是钢铁方坯、圆坯连续铸造（或半连铸）过程中，广泛应用电磁搅拌这一工艺装备，在连铸的不同时机对未凝固钢液进行电磁搅拌，通过调整电磁搅拌的电流、频率等，来协助控制连铸坯的凝固过程，以取得较好的铸坯表面和内部质量，现有电磁搅拌的典型磁场形态为旋转磁场，由于磁场形态单一，对一些高要求的高合金钢种难以满足要求
本实用新型复合磁场电磁搅拌装置，它在外壳的内侧设置有一环形磁轭，在磁轭内侧设置有若干铁芯线圈组件，旋转线圈和行波线圈分别缠绕在铁芯轭部和铁芯齿部，两组线圈径向布置于外壳和内筒之间，这样，两组线圈产生的磁场作用区间够长，装置的总长度得到充分利用；且由于设置有磁轭和铁芯轭部，磁场利用效率较高，是一种比较理想的选择。当给旋转线圈通以两相或三相的交变电流时，在复合磁场电磁搅拌装置内产生旋转磁场；给行波线圈通以两相或三相的交变电流时，在复合磁场电磁搅拌装置内产生沿轴向的行波磁场；给旋转线圈、行波线圈同时通以两相或三相的交变电流，在复合磁场电磁搅拌装置内产生螺旋磁场，而且磁场作用区间够长，磁场利用效率较高，可以更好的改善连铸坯内未凝固钢液的流动，增加补缩力，提高连铸坯的等轴晶率、减少中心偏析、减轻中心疏松和缩孔，满足高合金钢种更高的质量要求。
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Figure CN224807308U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of electromagnetic stirring, and more specifically, to a composite magnetic field electromagnetic stirring device. Background Technology
[0002] Electromagnetic stirring is widely used in the solidification process of steel or non-ferrous metals, especially in the continuous casting (or semi-continuous casting) of steel billets and round billets. Electromagnetic stirring is used to stir the molten steel at different stages of continuous casting. By adjusting the current and frequency of the electromagnetic stirring, the solidification process of the continuously cast billet can be controlled to obtain better surface and internal quality of the billet. The typical magnetic field of existing electromagnetic stirring is a rotating magnetic field. Due to the single magnetic field form, it is difficult to meet the requirements of some high-alloy steel grades with high requirements.
[0003] like Figure 8 As shown, the inventors previously proposed a multi-mode electromagnetic stirring device in a patent application. A magnetic field generator mounting space is provided between the inner and outer cylinders of the device. A traveling wave magnetic field generator group 8 and a rotating magnetic field generator 9 are arranged axially within this mounting space. The two magnetic field generator groups are arranged front-to-back, which is suitable for situations where the length and space are not limited. More often, the length of both magnetic field generator groups is shortened to meet the requirements of the mounting space. In this case, the actual effective range of each magnetic field is shortened, which is not ideal. Therefore, the inventors propose a technical solution where two sets of coils are arranged radially. Utility Model Content
[0004] In view of the above-mentioned technical problems in related technologies, this utility model provides a composite magnetic field electromagnetic stirring device, which can solve the above problems.
[0005] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows: A composite magnetic field electromagnetic stirring device includes a shell and an inner cylinder. Both ends of the shell and the inner cylinder are connected to an end plate, forming a closed installation space between the shell, the inner cylinder, and the end plates. An annular magnetic yoke is disposed on the inner side of the shell, and several iron core coil assemblies are disposed on the inner side of the magnetic yoke. Each iron core coil assembly includes an iron core, which comprises an elongated iron core yoke portion and several iron core teeth located on one side of the iron core yoke portion. The magnetic yoke is fastened to the iron core. A rotating coil is wound on the iron core yoke portion, and a traveling wave coil is wound on the iron core teeth. The rotating coil and the traveling wave coil are electrically connected to a power connection box located on the outer surface of the shell.
[0006] Furthermore, the outer casing is provided with a cooling pipe, which is connected to the installation space.
[0007] Furthermore, the power supply connection box is connected to a dedicated control power supply; when the dedicated control power supply supplies two-phase or three-phase alternating current to the rotating coil alone, a rotating magnetic field is generated in the stirring zone; when the dedicated control power supply supplies two-phase or three-phase alternating current to the traveling wave coil alone, an axial traveling wave magnetic field is generated in the stirring zone; when the dedicated control power supply supplies two-phase or three-phase alternating current to both the rotating coil and the traveling wave coil simultaneously, a spiral magnetic field is generated in the stirring zone.
[0008] Furthermore, the number of the iron core coil assemblies is a multiple of 2 or 3, and they are evenly distributed or arranged according to certain rules on the inner side of the magnetic yoke. The rotating coils are connected in a star connection or a delta connection.
[0009] Furthermore, each of the said iron core coil assemblies contains a multiple of 2 or 3 traveling wave coils, which are connected in a star or delta configuration.
[0010] Furthermore, the rotating coil and the traveling wave coil are wound with hollow copper tubes or with sintered wire.
[0011] Furthermore, the radial cross-sections of the inner cylinder and the outer shell are circular or polygonal.
[0012] The beneficial effects of this utility model are: This utility model relates to a composite magnetic field electromagnetic stirring device. It has an annular magnetic yoke on the inner side of the outer shell, and several iron core coil assemblies on the inner side of the magnetic yoke. Rotating coils and traveling wave coils are wound around the iron core yoke and the iron core teeth, respectively. The two sets of coils are radially arranged between the outer shell and the inner cylinder. In this way, the magnetic field range generated by the two sets of coils is long enough, and the total length of the device is fully utilized. Moreover, due to the presence of the magnetic yoke and the iron core yoke, the magnetic field utilization efficiency is high, making it a relatively ideal choice. When a two-phase or three-phase alternating current is applied to the rotating coil, a rotating magnetic field is generated in the composite magnetic field electromagnetic stirring device; when a two-phase or three-phase alternating current is applied to the traveling wave coil, an axial traveling wave magnetic field is generated in the composite magnetic field electromagnetic stirring device; when a two-phase or three-phase alternating current is applied to both the rotating coil and the traveling wave coil simultaneously, a spiral magnetic field is generated in the composite magnetic field electromagnetic stirring device. Moreover, the magnetic field has a long effective range and high utilization efficiency, which can better improve the flow of unsolidified molten steel in the continuously cast billet, increase the feeding force, improve the equiaxed crystal ratio of the continuously cast billet, reduce center segregation, alleviate center porosity and shrinkage cavities, and meet the higher quality requirements of high alloy steel grades. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] The present invention will now be described in further detail with reference to the accompanying drawings.
[0015] Figure 1 This is a front view of a composite magnetic field electromagnetic stirring device according to an embodiment of this utility model; Figure 2 This is a schematic diagram of the radial cross-section of a composite magnetic field electromagnetic stirring device according to an embodiment of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the radial cross-section of a composite magnetic field electromagnetic stirring device according to an embodiment of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the radial cross-section of a composite magnetic field electromagnetic stirring device according to an embodiment of the present invention. Figure 3 ; Figure 5 This is a front view of the iron core coil assembly described in this embodiment of the utility model; Figure 6 This is a front view of the iron core described in an embodiment of this utility model; Figure 7 This is a wiring diagram of the traveling wave coil described in an embodiment of this utility model.
[0016] Figure 8 This is a schematic diagram of the structure of a multi-mode electromagnetic stirring device from the previous patent application described in this utility model.
[0017] In the picture: 1. Magnetic yoke; 2. Iron core coil assembly; 3. Outer shell; 4. Cooling pipe; 5. Inner cylinder; 6. End plate; 7. Power connection box; 8. Traveling wave magnetic field generator assembly; 9. Rotating magnetic field generator; 21. Rotating coil; 22. Traveling wave coil; 23. Iron core; 231. Iron core yoke; 232. Iron core teeth. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.
[0019] like Figure 1 As shown, this utility model discloses a composite magnetic field electromagnetic stirring device, including an outer shell 3 and an inner cylinder 5. End plates 6 are provided at the front and rear ends of the outer shell 3 and the inner cylinder 5, forming a closed installation space to protect the coil. An annular magnetic yoke 1 is provided on the inner side of the outer shell 3, and several iron core coil assemblies 2 are provided on the inner side of the magnetic yoke 1. The magnetic yoke 1 is fastened to the iron core 23. Each iron core coil assembly 2 includes an iron core 23, a rotating coil 21 and a traveling wave coil 22. The iron core 23 includes an iron core yoke portion 231 and multiple iron core teeth 232. The rotating coil 21 is wound around the iron core yoke portion 231, and the multiple traveling wave coils 22 are wound around the iron core teeth 232. A power connection box 7 is provided on the outer shell 3 for connecting to a dedicated control power supply and controlling it through the dedicated control power supply. A cooling pipe 4 is provided on the outer shell 3 for connecting to a cooling water circulation device.
[0020] In a specific embodiment of this application, such as Figure 2 As shown, a magnetic yoke 1 is disposed between the outer shell 3 and the inner cylinder 5. Multiple iron core coil assemblies 2 are disposed inside the magnetic yoke 1. Each iron core coil assembly 2 includes an iron core 23, a rotating coil 21, and a traveling wave coil 22. The number of iron core coil assemblies 2 is a multiple of 2 or 3; in this embodiment, the number of iron core coil assemblies 2 is 6. In this embodiment, the radial cross-sections of the inner cylinder 5 and the outer shell 3 are circular.
[0021] In a specific embodiment of this application, such as Figure 3 As shown, a magnetic yoke 1 is disposed between the outer shell 3 and the inner cylinder 5. Multiple iron core coil assemblies 2 are disposed inside the magnetic yoke 1. Each iron core coil assembly 2 includes an iron core 23, a rotating coil 21, and a traveling wave coil 22. The number of iron core coil assemblies 2 is a multiple of 2 or 3; in this embodiment, there are 4 iron core coil assemblies 2. In this embodiment, the radial cross-section of the inner cylinder 5 is square, and the radial cross-section of the outer shell 3 is octagonal.
[0022] In a specific embodiment of this application, such as Figure 4 As shown, a magnetic yoke 1 is disposed between the outer shell 3 and the inner cylinder 5. Six iron core coil assemblies 2 are disposed inside the magnetic yoke 1. Three of these assemblies 2 include an iron core 23, a rotating coil 21, and a traveling wave coil 22. The other three assemblies 2 have no traveling wave coils 22 and only contain an iron core 23 and a rotating coil 21. By connecting the traveling wave coils 22 in a certain manner, a traveling wave magnetic field along the axis of the inner cylinder 5 can still be generated after energization. This method is suitable for situations where a strong traveling wave magnetic field is not required.
[0023] In a specific embodiment of this application, such as Figure 5 , 6As shown, the iron core coil assembly 2 includes an iron core 23, a rotating coil 21, and a traveling wave coil 22. The iron core 23 includes an iron core yoke 231 and a plurality of iron core teeth 232. The rotating coil 21 is wound around the iron core yoke 231, and the plurality of traveling wave coils 22 are wound around the iron core teeth 232. The number of traveling wave coils 22 included in a single iron core coil assembly 2 is a multiple of 2 or 3. In this embodiment, the number of iron core coil assemblies 2 is 6.
[0024] In a specific embodiment of this application, such as Figure 7 As shown, each core coil assembly 2 contains 6 traveling wave coils 22, using a three-phase power supply, with 2 coils connected in series for each phase, and a star connection. The traveling wave coils of multiple core coil assemblies can be connected to the power connection box 7 in parallel or series.
[0025] In contrast to existing technologies, in an embodiment of a multi-mode electromagnetic stirring device from the preceding patent application described in this application, such as... Figure 8 As shown, a magnetic field generator installation space is provided between the inner cylinder 5 and the outer shell 3. A traveling wave magnetic field generator group 8 and a rotating magnetic field generator 9 are arranged along the axial direction in the magnetic field generator installation space. The two groups of magnetic field generators are arranged back and forth along the axis, which is suitable for situations where the length space is not limited. However, more often, the length of both groups of magnetic field generators is shortened to meet the requirements of the installation space. In this case, the actual range of action of each magnetic field is shortened, which is not very ideal.
[0026] In summary, the device of this application is installed in the secondary cooling zone or solidification end of the continuous casting machine. The continuously cast billet passes through the inner cylinder 5, and a two-phase (or three-phase) alternating current is supplied to the coil to generate an alternating magnetic field in the composite magnetic field electromagnetic stirring device. The alternating magnetic field generates an electromagnetic stirring force in the unsolidified molten steel in the continuously cast billet. The shape, magnitude and direction of the stirring force can be adjusted and controlled by the power supply. Compared with a single rotating magnetic field, the application of composite multi-form magnetic fields can better improve the flow of unsolidified molten steel in the continuously cast billet, increase the feeding force, improve the equiaxed crystal ratio of the continuously cast billet, reduce center segregation, alleviate center porosity and shrinkage cavities, and meet the higher quality requirements of high alloy steel grades.
[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A composite magnetic field electromagnetic stirring device, characterized in that, The device includes an outer shell (3) and an inner cylinder (5). Both the front and rear ends of the outer shell (3) and the inner cylinder (5) are connected to an end plate (6). A closed installation space is formed between the outer shell (3), the inner cylinder (5), and the end plate (6). An annular magnetic yoke (1) is provided on the inner side of the outer shell (3). Several iron core coil assemblies (2) are provided on the inner side of the magnetic yoke (1). Each iron core coil assembly (2) includes an iron core (23). The iron core (23) encloses... The magnetic yoke (1) includes a long strip-shaped iron core yoke (231) and several iron core teeth (232) located on one side of the iron core yoke (231). The magnetic yoke (1) is fastened to the iron core (23). A rotating coil (21) is wound on the iron core yoke (231), and a traveling wave coil (22) is wound on the iron core teeth (232). The rotating coil (21) and the traveling wave coil (22) are electrically connected to a power supply box (7) located on the outer surface of the outer shell (3).
2. The composite magnetic field electromagnetic stirring device according to claim 1, characterized in that, The outer casing (3) is provided with a cooling pipe (4), which is connected to the installation space.
3. The composite magnetic field electromagnetic stirring device according to claim 1, characterized in that, The power supply connection box (7) is connected to a dedicated control power supply; when the dedicated control power supply supplies two-phase or three-phase alternating current to the rotating coil (21) alone, a rotating magnetic field is generated in the stirring zone; when the dedicated control power supply supplies two-phase or three-phase alternating current to the traveling wave coil (22) alone, a traveling wave magnetic field along the axial direction is generated in the stirring zone; when the dedicated control power supply supplies two-phase or three-phase alternating current to both the rotating coil (21) and the traveling wave coil (22) at the same time, a spiral magnetic field is generated in the stirring zone.
4. The composite magnetic field electromagnetic stirring device according to claim 1, characterized in that, The number of the iron core coil assembly (2) is a multiple of 2 or 3, and they are evenly distributed or arranged in a certain rule on the inner side of the magnetic yoke (1). The rotating coil (21) is connected in a star connection or a delta connection.
5. The composite magnetic field electromagnetic stirring device according to claim 1, characterized in that, Each of the said iron core coil assembly (2) contains a number of traveling wave coils (22) that are multiples of 2 or 3, and the traveling wave coils (22) are connected in a star or delta configuration.
6. The composite magnetic field electromagnetic stirring device according to claim 1, characterized in that, The rotating coil (21) and the traveling wave coil (22) are wound with hollow copper tubes or with sintered wire.
7. The composite magnetic field electromagnetic stirring device according to claim 1, characterized in that, The radial cross-sections of the inner cylinder (5) and the outer shell (3) are circular or polygonal.