High-temperature molten metal magnetic stirring device, stirring container and furnace body

Abstract

The utility model provides a high-temperature molten metal magnetic stirring device, a stirring container and a furnace body, relates to the technical field of high-temperature molten metal stirring, and solves the problems of contact pollution, short service life, low electromagnetic stirring energy efficiency and limited application caused by mechanical stirring in the existing high-temperature molten metal stirring. The electromagnetic stirring device comprises a stirring assembly used for conducting electromagnetic stirring on molten metal, the stirring assembly comprises a rotating rod arranged in the molten metal in an up-down sliding mode and a motor used for driving the rotating rod to rotate, and the other end of the rotating rod is detachably and fixedly connected with a permanent magnet block set. The isolation assembly is arranged in the molten metal and used for avoiding the influence of the high temperature of the molten metal on the permanent magnet block set, and the isolation assembly comprises a corrosion-resistant pipe, a heat insulation layer and a hollow convection layer. The beneficial effects of the utility model are that the heat dissipation effect is good, and the rotating rod and the permanent magnet block group can be better protected; the application range is wide, various stirring requirements can be met, the service life is prolonged, and the magnetic field intensity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature molten metal stirring technology, in particular to a high-temperature molten metal magnetic stirring device. Background Art

[0002] In recent years, with the continuous progress of materials science and engineering technology, high-temperature molten metal processing technology has become increasingly important in the fields of metallurgy, aerospace, and nuclear industry. Effective stirring of high-temperature molten metal has become a key step in improving metal quality, ensuring alloy uniformity, and improving material properties.

[0003] The existing Chinese patent with the authorization announcement number CN208194390U provides a metalworking fluid heating stirring reactor, which directly penetrates the metal solution to operate by using the traditional mechanical stirring method. However, the stirring device will face the problem of reduced corrosion resistance and strength in a high temperature environment, and is easily damaged and contaminated. In addition, mechanical stirring is also very difficult to apply in some occasions that require sealed operation.

[0004] In comparison, electromagnetic stirring technology is mostly arranged outside the molten metal container, and it has significant advantages such as non-contact, pollution-free and simple control. However, the existing utility model with authorization announcement number CN203432310U provides an induction heating metal smelting furnace. This stirring method requires continuous establishment and maintenance of a changing strong magnetic field, which leads to large power consumption and significant heating problems, and even requires additional water cooling mechanisms for heat dissipation management. The stirring effect is also limited by factors such as the material, thickness, heat dissipation characteristics and layout of the molten metal container. When stirring the molten metal in a container with a larger diameter, the stirring force of the electromagnetic stirring on the center of the container is particularly weak, affecting the uniformity and effect of the stirring.

[0005] Permanent magnets have the advantages of low power consumption, simple design, and high magnetic density due to their strong magnetic field. Permanent magnets are also widely used to stir molten metal. However, the existing patent with announcement number CN104162380A provides a permanent magnet stirring device for semi-solid alloy solution that can be used for experiments. The permanent magnet easily loses its magnetism at high temperatures. Most permanent magnets are designed at the bottom of the container, which requires the bottom of the container to be modified, and the magnetic force acts on the molten metal at a long distance.

[0006] In summary, the current high-temperature molten metal magnetic stirring technology still faces many challenges in terms of efficiency, energy consumption, cooling mechanism and adaptability. It is necessary to develop a new stirring device to enhance the control of molten metal, optimize energy utilization efficiency, and be able to widely adapt to different types and sizes of molten metal containers, so as to comprehensively improve the application effect of high-temperature molten metal processing technology. Utility Model Content

[0007] The object of the present utility model is to solve the problems of contact contamination, short service life caused by mechanical stirring, low energy efficiency of electromagnetic stirring and limited application in the existing stirring of high-temperature molten metal.

[0008] To achieve the above object, the present utility model adopts the following technical solutions:

[0009] A magnetic stirring device for high-temperature molten metal, characterized in that: it includes a stirring component for electromagnetic stirring of the molten metal. The stirring component includes a rotating rod slidably arranged up and down in the molten metal and a motor for driving the rotating rod to rotate. The output end of the motor is fixedly connected to one end of the rotating rod. The other end of the rotating rod extends into the molten metal and is detachably and fixedly connected with a permanent magnet block group. A spiral fan blade is arranged on the upper part of the rotating rod;

[0010] It also includes an isolation component arranged in the molten metal to avoid the influence of the high temperature of the molten metal on the permanent magnet block group. The isolation component includes a corrosion-resistant pipe, a heat-insulating layer and a hollow convection layer. The lower part of the corrosion-resistant pipe is immersed in the molten metal. The corrosion-resistant pipe is fixed and does not rotate. The heat-insulating layer is arranged in the corrosion-resistant pipe. The hollow convection layer is arranged in the heat-insulating layer. The hollow convection layer is provided with through holes penetrating from top to bottom. The rotating rod, the spiral fan blade and the permanent magnet block group rotate in the hollow convection layer. A temperature measuring rod and an air pipe are also arranged in the hollow convection layer. The temperature measuring rod and the air pipe both extend upward out of the hollow convection layer; A plurality of groups of shunt pipes are arranged at equal intervals from top to bottom on the outer wall of the air pipe. The shunt pipe group includes a first shunt pipe, a second shunt pipe and a third shunt pipe communicated with the air pipe. The first shunt pipe is inclined downward by 15-45° towards the rotating rod direction. The second shunt pipe extends forward. The third shunt pipe extends backward.

[0011] A further improvement is that: the permanent magnet block group is formed by adjustably stacking a plurality of permanent magnet blocks.

[0012] A further improvement is that: the plurality of permanent magnet blocks of the permanent magnet block group are stacked in the Halbach array arrangement.

[0013] A further improvement is that: the corrosion-resistant pipe is made of a corrosion-resistant and high-temperature-resistant non-magnetic material.

[0014] A further improvement is that: the corrosion-resistant pipe is made of silicon carbide material.

[0015] A further improvement is that: the heat-insulating layer is made of a heat-insulating material with a low thermal conductivity.

[0016] A further improvement is that: the heat-insulating layer is made of aerogel.

[0017] A magnetic stirring container for high-temperature molten metal, characterized in that it includes the above-mentioned magnetic stirring device for high-temperature molten metal and a molten metal container for containing molten metal, and the lower part of the isolation component is located in the molten metal container.

[0018] A high-temperature molten metal magnetic furnace body, characterized in that it includes the above-mentioned magnetic stirring device for high-temperature molten metal and a furnace body for containing molten metal, and the lower part of the isolation component is located in the furnace body.

[0019] After adopting the above technical solution, compared with the existing technology, it has the following beneficial effects:

[0020] By providing an isolation component, the rotating rod and the permanent magnet block group can be integrated in the corrosion-resistant pipe, which can prevent the molten metal from corroding the rotating rod and the permanent magnet block group, and better protect the rotating rod and the permanent magnet block group;

[0021] The spiral fan blades can improve the heat dissipation effect and efficiency; the shunt pipe group directly blows cold air on the permanent magnet block group, and the cooling effect is better, which can reduce the direct upward overflow of the cold air in the ventilation pipe;

[0022] By inserting the rotating rod and the permanent magnet block group from above, the original molten metal container does not need to be specially modified, and it has a wide range of applications. Compared with the bottom-mounted permanent magnet stirring, the distance from the magnetic field to the molten metal is shorter. For the same stirring effect, the amount of permanent magnets can be reduced and the diameter of the corrosion-resistant pipe can be reduced, thereby reducing costs. The rotating rod can slide up and down, which can adjust the stirring depth and is also convenient for maintenance;

[0023] The permanent magnets can be combined into permanent magnet block groups with different rotation angles, which can meet various stirring requirements;

[0024] Through the formation of a chimney effect by the hollow convection layer, automatic air convection is formed. Combined with the ventilation pipe, the temperature of the permanent magnet block group can be well reduced, and its service life and magnetic field strength can be increased;

[0025] Since the corrosion-resistant pipe is fixed and does not rotate, it has a longer service life and can be immersed in the molten metal for a long time, which can meet various stirring requirements. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0028] Figure 2 It is a schematic structural diagram of the rotating rod, the fan blade and the permanent magnet block group in the present utility model;

[0029] Figure 3 It is a schematic cross-sectional structural diagram of the air vent pipe in the present utility model;

[0030] Figure 4 It is a schematic front partial structural diagram of the air vent pipe in the present utility model;

[0031] Figure 5 It is a schematic structural diagram of the second embodiment of the present utility model;

[0032] Figure 6 It is a schematic structural diagram of the third embodiment of the present utility model;

[0033] Figure 7 It is a schematic diagram of the simulation of temperature and air flow for the two-dimensional axisymmetric model of the hollow convection layer in the present utility model.

[0034] Explanation of reference numerals: molten metal container 1, molten metal 2, corrosion-resistant pipe 3, heat insulation layer 4, hollow convection layer 5, temperature measuring rod 6, air vent pipe 7, motor 8, rotating rod 9, permanent magnet block group 10, permanent magnet 11, through hole 12, furnace body 13, spiral fan blade 14, first shunt pipe 15, second shunt pipe 16, third shunt pipe 17. Specific implementation manners

[0035] Embodiment 1. Refer to Figures 1-4 As shown, the technical solution adopted in this specific implementation manner is:

[0036] A high-temperature molten metal magnetic stirring device includes a stirring assembly for electromagnetic stirring of molten metal 2. The stirring assembly includes a rotating rod 9 slidably arranged up and down in the molten metal 2, and a motor 8 for driving the rotating rod 9 to rotate. The output end of the motor 8 is fixedly connected to one end of the rotating rod 9. The other end of the rotating rod 9 extends into the molten metal 2 and is detachably and fixedly connected with a permanent magnet block group 10. A spiral fan blade 14 is arranged on the upper part of the rotating rod 9;

[0037] It further includes an isolation component disposed in the molten metal 2 to avoid the influence of the high temperature of the molten metal 2 on the permanent magnet block group 10. The isolation component includes a corrosion-resistant pipe 3, a heat-insulating layer 4, and a hollow convection layer 5. The lower part of the corrosion-resistant pipe 3 is immersed in the molten metal 2, and the corrosion-resistant pipe 3 is fixed and does not rotate. The heat-insulating layer 4 is disposed in the corrosion-resistant pipe 3, and the hollow convection layer 5 is disposed in the heat-insulating layer 4. The hollow convection layer 5 is provided with through holes 12 that penetrate from top to bottom. The rotating rod 9, the spiral fan blades 14, and the permanent magnet block group 10 rotate within the hollow convection layer 5. A temperature measuring rod 6 and an air vent pipe 7 are also disposed within the hollow convection layer 5. The temperature measuring rod 6 and the air vent pipe 7 both extend upward out of the hollow convection layer 5. A plurality of shunt pipe groups are equidistantly arranged on the outer wall of the air vent pipe 7 from top to bottom. The shunt pipe group includes a first shunt pipe 15, a second shunt pipe 16, and a third shunt pipe 17 that communicate with the air vent pipe 7. The first shunt pipe 15 is inclined downward by 15-45° toward the rotating rod 9. The second shunt pipe 16 extends forward, and the third shunt pipe 17 extends backward; the first shunt pipe 15 is inclined downward by 30°;

[0038] The hollow convection layer 5 is provided with through holes 12. Since heat is transferred from the corrosion-resistant pipe 3 to the heat-insulating layer 4 and then to the hollow convection layer 5 and further to the rotating rod 9 and the permanent magnet block group 10, the air temperature inside the hollow convection layer 5 is higher than that of the rotating rod 9 and the permanent magnet block group 10. Utilizing the chimney effect, the hollow convection layer 5 can automatically suck air from the bottom of the rotating rod 9 and the permanent magnet block group 10 and discharge the hot air from above, thereby taking away heat and reducing the temperature of the rotating rod 9 and the permanent magnet block group 10. Even if the air vent pipe 7 fails, the automatic air circulation in the hollow convection layer 5 can effectively maintain the temperature of the permanent magnet block group 10 within the normal working range and avoid demagnetization; the air vent pipe 7 and the temperature measuring rod 6 are provided. The air vent pipe 7 can continuously introduce cold air into the interior, which can further reduce the temperature of the rotating rod 9 and the permanent magnet block group 10 and increase the service life and magnetic field strength of the permanent magnet block group 10. The temperature measuring rod 6 continuously monitors the temperature inside the pipe. When the temperature is too high, the air ventilation volume can be increased or the permanent magnet block group 10 and the rotating rod 9 can be removed to keep the permanent magnet block group 10 within the optimal working temperature range; when the rotating rod 9 rotates, the spiral fan blades 14 will rotate, and blowing downward can accelerate the discharge of hot air from the through holes of the hollow convection layer 5, improving the heat dissipation effect and efficiency; a first shunt pipe 15 is provided on the outer wall of the air vent pipe. The first shunt pipe 15 will directly blow the cold air toward the rotating rod and the permanent magnet block group 10, achieving a better cooling effect. By blowing forward through the second shunt pipe 16 and backward through the third shunt pipe 17, the cold air from the air vent pipe can be prevented from directly overflowing upward.

[0039] Among them, the rotating rod 9 can slide up and down, which can adjust the stirring range and also facilitate the overall removal of the rotating rod 9 and the permanent magnet block group 10 for maintenance.

[0040] Among them, the permanent magnet block group 10 is formed by adjustably stacking a plurality of permanent magnet blocks 11. Among them, by adjusting the stacking number of the permanent magnet blocks 11, the stirring height and the acting range can be changed; by adjusting the stacking angle of the permanent magnet blocks 11, a stirring effect similar to a helix can be achieved.

[0041] Among them, the plurality of the permanent magnet blocks 11 of the permanent magnet block group 10 are stacked in a Halbach array arrangement. Among them, stacking a plurality of permanent magnet blocks 11 in a Halbach array can generate a stronger magnetic field.

[0042] Among them, the corrosion-resistant pipe 3 is made of a non-magnetic material that is corrosion-resistant and high-temperature resistant.

[0043] Among them, the corrosion-resistant pipe 3 is made of silicon carbide material. Among them, the corrosion-resistant pipe 9 is made of a corrosion-resistant and high-temperature resistant non-magnetic material such as silicon carbide, which mainly plays an isolation role and does not need to bear high pressure or mechanical rotational motion. Therefore, the wall thickness can be reduced, which not only reduces the cost but also is beneficial to the magnetic field acting on the molten metal.

[0044] Among them, the heat insulation layer 4 is made of a heat insulation material with a low thermal conductivity.

[0045] Among them, the heat insulation layer 4 is made of aerogel. Among them, the heat insulation layer 4 is made of a heat insulation material with a low thermal conductivity such as aerogel, which can reduce the heat transfer to the stirring assembly.

[0046] Embodiment 2, see Figures 2-5 As shown, the technical solution adopted in this specific embodiment is: a high-temperature molten metal magnetic stirring container, including the high-temperature molten metal magnetic stirring device described in Embodiment 1 and a molten metal container 1 for containing molten metal 2, and the lower part of the isolation assembly is located in the molten metal container 1.

[0047] Embodiment 3, see Figure 2 、 3 、4、6 as shown, the technical solution adopted in this specific embodiment is: a high-temperature molten metal magnetic furnace body, including the high-temperature molten metal magnetic stirring device described in Embodiment 1 and a furnace body 13 for containing molten metal 2, and the lower part of the isolation assembly is located in the furnace body 13.

[0048] Working principle of the present utility model: The rotating rod 9 and the permanent magnet block group 10 are integrated inside the corrosion-resistant pipe 3. The lower part of the corrosion-resistant pipe 3 can be directly immersed in the molten metal 2. The corrosion-resistant pipe 3 itself is fixed and does not rotate. The rotating rod 9 and the permanent magnet block group 10 are driven to rotate by the motor 8. The rotation of the permanent magnet block group 10 forms a magnetic field to drive the stirring of the molten metal 2. The rotating rod 9 and the permanent magnet block group 10 are inserted from above, and no special modification is required for the original molten metal container 1 or the furnace body 13, etc., with a wide range of applications. Compared with the bottom-type permanent magnet stirring, the distance from the magnetic field in the present utility model to the molten metal 2 is shorter. For the same stirring effect, the amount of permanent magnets can be reduced and the diameter of the corrosion-resistant pipe 3 can be decreased, thereby reducing costs; the permanent magnet blocks 11 can be combined into the permanent magnet block group 10 with different rotation angles to produce a stirring effect similar to a helix; a hollow convection layer 5 utilizing the chimney effect is provided to form automatic air convection, which can take away the heat of the rotating rod 9 and the permanent magnet block group 10 even when the ventilation pipe 7 fails, protecting the internal permanent magnet blocks 11 from losing magnetism due to high temperature. Combined with the continuous introduction of cooling gas through the ventilation pipe 7 during operation, the temperature of the permanent magnet block group 10 can be further reduced, increasing its service life and magnetic field strength; when the rotating rod 9 rotates, the spiral fan blades 14 will rotate, blowing downward to accelerate the discharge of hot air from the through holes of the hollow convection layer 5, improving the heat dissipation effect and efficiency; a first shunt pipe 15 is provided on the outer wall of the ventilation pipe. The first shunt pipe 15 will directly blow the cold air towards the rotating rod and the permanent magnet block group 10, with a better cooling effect. Blowing forward through the second shunt pipe 16 and backward through the third shunt pipe 17 can reduce the direct upward overflow of the cold air from the ventilation pipe, ensuring the heat dissipation effect;

[0049] Since the corrosion-resistant pipe 3 has no mechanical moving parts, it has a longer service life and can be immersed in the molten metal 2 for a long time. It can be applied to situations where long-term, low-speed stirring is required to keep the metal composition and temperature uniform. Under special conditions such as sealing and heat preservation, since the corrosion-resistant pipe 3 has no rotating parts, it can be adaptively modified with a sealing cover, etc.; the rotating rod 9 can slide up and down, the stirring depth can be adjusted, and it is also convenient for maintenance;

[0050] When it is necessary to stir a large volume of molten metal 2, in addition to enhancing the stirring effect by increasing the size, since the stirring assembly and the isolation assembly have a simple structure and low cost, multiple stirring assemblies and isolation assemblies can also be arranged at different positions to stir simultaneously to improve the overall stirring effect; compared with the traditional electromagnetic stirring that can only stir the outer edge position of the molten metal 2, this device is more flexible and does not require destructive modification of the original molten metal 2 equipment, having obvious advantages in fields such as holding furnace stirring, semi-solid stirring, and sealed ventilation low-pressure casting.

[0051] The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and descriptions only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Where the present utility model is not described in detail, it is the well-known technology of those skilled in the art.

Claims

1. A high-temperature molten metal magnetic stirring device, characterized in that: The invention comprises a stirring assembly for electromagnetically stirring the molten metal, the stirring assembly comprises a rotating rod which can slide up and down in the molten metal, and a motor for driving the rotating rod to rotate, the output end of the motor is fixedly connected to one end of the rotating rod, the other end of the rotating rod extends into the molten metal and is detachably and fixedly connected to a permanent magnet block group; the upper part of the rotating rod is provided with a spiral blade; It also includes an isolation component arranged in the molten metal to avoid the influence of the high temperature of the molten metal on the permanent magnet block group, the isolation component includes a corrosion-resistant tube, an insulation layer, and a hollow convection layer, the lower part of the corrosion-resistant tube is immersed in the molten metal, the corrosion-resistant tube is fixed and does not rotate, the insulation layer is arranged in the corrosion-resistant tube, the hollow convection layer is arranged in the insulation layer, the hollow convection layer is provided with through holes from top to bottom, the rotating rod, the spiral fan blades and the permanent magnet block group are rotated in the hollow convection layer, the hollow convection layer is also provided with a temperature measuring rod and a vent pipe, the temperature measuring rod and the vent pipe both extend upward from the hollow convection layer; the outer wall of the vent pipe is provided with a plurality of groups of diverter tube groups arranged at equal intervals from top to bottom, the diverter tube group includes a first diverter tube, a second diverter tube, and a third diverter tube connected to the vent pipe, the first diverter tube is inclined downward by 15-45° toward the rotating rod, the second diverter tube extends forward, and the third diverter tube extends backward.

2. A high temperature molten metal magnetic stirring device according to claim 1, characterized in that: The permanent magnet block group is formed by a plurality of permanent magnet blocks being adjustable and stacked.

3. A high temperature molten metal magnetic stirring device according to claim 2, characterized in that: Several permanent magnet blocks of the permanent magnet block group are stacked in a Halbach array arrangement.

4. A high temperature molten metal magnetic stirring device according to claim 1, characterized in that: The corrosion-resistant pipe is made of corrosion-resistant and high-temperature-resistant non-magnetic material.

5. A high temperature molten metal magnetic stirring device according to claim 4, characterized in that: The corrosion-resistant pipe is made of silicon carbide material.

6. A high temperature molten metal magnetic stirring device according to claim 1, characterized in that: The heat insulation layer is made of heat insulation material with low thermal conductivity.

7. A high temperature molten metal magnetic stirring device according to claim 6, characterized in that: The heat insulation layer is made of aerogel.

8. A high temperature molten metal magnetic stirring container, characterized in that: It comprises a high-temperature molten metal magnetic stirring device as described in any one of claims 1 to 7 and a molten metal container for containing the molten metal, wherein the lower part of the isolation component is located in the molten metal container.

9. A high temperature molten metal magnetic furnace, characterized in that: It comprises a high-temperature molten metal magnetic stirring device as described in any one of claims 1 to 7 and a furnace body for containing the molten metal, wherein the lower part of the isolation component is located in the furnace body.

Images