Magnet device for induction heating

Abstract

The present application relates to the technical field of induction heating, and discloses a magnet device for induction heating. The device comprises: coils, wherein the number of the coils is at least four and is an even number, the at least four coils are evenly divided into two groups, and the two groups of coils are symmetrically arranged around an axis; and a driving unit arranged on the symmetry axis of the coils, the driving unit being used for driving a metal material to be heated to rotate. According to the present application, an even number of coils are combined to form an annular coil device, so that a larger and more uniform magnetic field can be generated in the center, facilitating the improvement of the eddy current heating effect.

Description

A magnet device for induction heating Technical Field

[0001] The present application relates to the technical field of induction heating, and in particular to a magnet device for induction heating. Background Art

[0002] With the continuous advancement of industrialization, the use of metal materials has continued to increase, and industrial production has put forward higher requirements for the supply of raw materials and semi-finished products. As a result, production companies must, on the one hand, improve production efficiency and shorten production cycles, and on the other hand, promote energy-saving and emission reduction measures in industrial production to face the impending energy crisis.

[0003] In traditional metal smelting and processing, such as the smelting and heat treatment of aluminum and zinc, they need to be melted or preheated multiple times to achieve the maximum processing state. The conventional practice is to use gas to heat the surface of the material, allowing it to conduct naturally to achieve the effect of overall heating. However, this conventional method has obvious disadvantages: first, surface heating causes uneven heating of the material. For coarser materials, it will cause a large temperature difference between the inside and outside of the material, which may damage the material's grain structure. Second, it takes a long time to wait for the material temperature to be evenly distributed before proceeding to subsequent processes. Third, the efficiency of surface heating is low, about 30% to 50%, resulting in significant energy waste.

[0004] Given the shortcomings of surface heating, induction heating has emerged. During induction heating, a magnet generates a magnetic field within which the metal moves. The relative movement of the magnetic field and the metal generates eddy currents within the metal, which heat the metal. This heating efficiency is 70-90%, significantly reducing product energy costs and increasing product competitiveness. However, induction heating utilizes magnetically conductive materials to guide the magnetic field, creating a uniform magnetic field within the heating area. This method suffers from a relatively low intensity uniform magnetic field, requiring longer heating times and requiring a higher rotational speed. Summary of the Invention

[0005] The embodiments of the present application provide a magnet device for induction heating, which is used to solve the problem of low magnetic field strength caused by the use of magnetic conductive materials in the prior art.

[0006] In one aspect, an embodiment of the present application provides a magnet device for induction heating, comprising:

[0007] The number of coils is at least four and is an even number, the at least four coils are evenly divided into two groups, and the two groups of coils are symmetrically arranged around the axis;

[0008] The driving unit is arranged on the symmetry axis of the coil, and is used for driving the metal material to be heated to rotate.

[0009] In one possible implementation, it also includes an outer shell, which is an annular cylindrical structure. A heating area is formed inside the inner wall of the outer shell, and a magnetic field area is formed between the outer wall and the inner wall of the outer shell. The heating area is used to place metal materials, and the coil is set in the magnetic field area.

[0010] In a possible implementation, a magnetic shielding material is provided on the outer wall.

[0011] In a possible implementation manner, the coil is installed in the magnetic field region via a coil support.

[0012] In a possible implementation, the coil is made of superconducting material.

[0013] In a possible implementation, the coil is a circular ring or rectangular ring structure.

[0014] In a possible implementation, a curing agent is used to cure the coil after it is wound.

[0015] A magnet device for induction heating in this application has the following advantages:

[0016] 1. An even number of coils are combined to form a ring-shaped coil device, which can generate a larger and more uniform magnetic field in the center, which is more conducive to improving the eddy current heating effect;

[0017] 2. The toroidal coil is more suitable for the layout of the production site. The material can be fed vertically or horizontally, which is more conducive to the layout of the automated production line;

[0018] 3. No need for magnetic conductive materials, which will greatly reduce the weight of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] FIG1 is a schematic diagram of the overall structure of a magnet device for induction heating provided in an embodiment of the present application;

[0021] FIG2 is a schematic diagram of a magnetic field of a magnet device for induction heating provided in an embodiment of the present application.

[0022] Description of the accompanying drawings: 100-housing, 200-coil, 300-metal material. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] FIG1 is a schematic diagram of the structure of a magnet device for induction heating provided in an embodiment of the present application. The embodiment of the present application provides a magnet device for induction heating, comprising:

[0025] The number of the coils 200 is at least four and is an even number. The at least four coils 200 are evenly divided into two groups, and the two groups of coils 200 are symmetrically arranged around the axis.

[0026] The driving unit is arranged on the symmetry axis of the coil 200 and is used to drive the metal material 300 to be heated to rotate.

[0027] For example, the number of coils 200 is preferably four. When four coils 200 are used, each group has two coils 200. Four coils 200 can generate a higher magnetic field than two coils 200. Furthermore, the four coils 200 are arranged symmetrically around the center, with the axes of the two coils 200 in the same group at an angle of 60° or 80°. This angle arrangement can form a nearly uniform magnetic field with a consistent direction near the axis of symmetry, allowing the metal material 300 to cut the magnetic flux lines in the magnetic field when rotating in this region, thereby forming eddy currents within the metal material 300.

[0028] When six or more coils 200 are used, a stronger magnetic field can be provided, and the uniformity and direction consistency of the magnetic field are also better. In actual application scenarios, the number of coils 200 and the angle of arrangement can be flexibly selected according to needs.

[0029] After the coils 200 are arranged, a vertical or horizontal axis of symmetry is formed. The centers of the multiple coils 200 are located in the same plane perpendicular to the axis of symmetry, so that the magnetic fields generated by the multiple coils 200 after power is applied and excitation are also located in an overlapping area, as shown in Figure 2. It should be understood that the shape and size of the coils 200 will affect the magnetic field. To ensure that the magnetic fields generated by the multiple coils 200 are in the same plane, in addition to ensuring that the coils 200 are installed in the same position, it is also necessary to ensure that each coil 200 is identical in shape and size.

[0030] In the embodiment of the present application, the coil 200 is made of a superconducting material. Specifically, a wire made of a high-temperature superconducting material or a low-temperature superconducting material can be used to wind the coil 200 into a circular or rectangular ring shape. After winding, the coil can be cured with a curing agent to increase the strength of the coil 200 and prevent deformation during use.

[0031] The driving unit can be a motor, which can directly drive or drive the metal material 300 to rotate through a driving mechanism such as gears and belts. The rotating axis coincides with the symmetry axis of the coil 200 during rotation. When the metal material 300 is installed on the driving unit, the position to be heated is in a uniform and basically consistent direction magnetic field area formed by the coil 200. At this time, the driving unit drives the metal material 300 to rotate, so that eddy currents are formed inside the metal material 300, and the position to be heated is heated.

[0032] In a possible embodiment, it also includes a shell 100, which is an annular cylindrical structure. A heating area is formed inside the inner wall of the shell 100, and a magnetic field area is formed between the outer wall and the inner wall of the shell 100. The heating area is used to place the metal material 300, and the coil 200 is arranged in the magnetic field area.

[0033] Exemplarily, the housing 100 may be a cylindrical or prismatic annular tube, the magnetic field region inside of which is a closed structure. When the coil 200 is set therein through a coil bracket, the coil 200 can be cooled to a critical temperature or below by liquid helium or other cooling means, and a low-temperature environment can be maintained so that the coil 200 is always in a superconducting state. After it is energized, it can withstand a current of hundreds of amperes and generate a strong magnetic field, thereby increasing the magnetic field strength in the heating area and reducing the speed requirement for the drive unit during the heating process.

[0034] Furthermore, a magnetic shielding material can be provided on the outer wall of the magnetic field region. The magnetic shielding material can be made of ferromagnetic metals, such as iron, nickel, and alloys thereof. By providing the magnetic shielding material, the magnetic field generated by the coil 200 can be confined to the magnetic field region and the heating region, and will not spread outside the magnetic field region, thereby preventing any impact on external equipment and personnel.

[0035] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0036] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A magnet device for induction heating, characterized in that: include: The number of coils (200) is at least four and is an even number, the at least four coils (200) are evenly divided into two groups, and the two groups of coils (200) are symmetrically arranged around an axis; A driving unit is arranged on the symmetry axis of the coil (200), and the driving unit is used to drive the metal material (300) to be heated to rotate.

2. A magnet device for induction heating according to claim 1, characterized in that: It also comprises a shell (100), the shell (100) being an annular cylindrical structure, a heating area formed around the inner wall of the shell (100), a magnetic field area formed around the outer wall and the inner wall of the shell (100), the heating area being used for placing a metal material (300), and the coil (200) being arranged in the magnetic field area.

3. A magnet device for induction heating according to claim 2, characterized in that: The outer wall is provided with magnetic shielding material.

4. A magnet device for induction heating according to claim 2, characterized in that: The coil (200) is installed in the magnetic field region via a coil support.

5. A magnet device for induction heating according to claim 1, characterized in that: The coil (200) is made of superconducting material.

6. A magnet device for induction heating according to claim 1, characterized in that: The coil (200) is a circular ring or rectangular ring structure.

7. A magnet device for induction heating according to claim 1, characterized in that: After the coil (200) is wound, it is cured using a curing agent.

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