Long kidney-shaped hollow coil electromagnetic heating device
Through the long waist hollow coil structure and bracket fixation, the problem of uneven heating of the electromagnetic heating device of the plate-type material is solved, and a more uniform and stable heating effect is achieved.
Patent Information
- Application Number
- CN202422501664.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-10-16
AI Technical Summary
The existing electromagnetic heating devices of plate-type materials have problems of uneven heating, especially the heating effect of the central heating of the plate profile is poor.
The long waist-shaped hollow coil structure is adopted, and the first electromagnetic wire is bent on the outside of the long plate to increase the magnetic induction strength in the middle, and the second electromagnetic wire is inclined to reduce heating at both ends, and fixing it with the bracket and ferromagnetic coating to improve heating uniformity and stability.
It improves the heating effect of the center of the sheet, reduces heating unevenness and overheating, and improves the stability and energy efficiency of heating.
Smart Images
Figure CN223231351U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electromagnetic heating, in particular to a long waist-shaped hollow coil electromagnetic heating device. Background Art
[0002] Electromagnetic heating is also called electromagnetic induction heating. The principle of electromagnetic heating is to generate an alternating magnetic field through the components of the electronic circuit board. When an iron-containing container is placed on it, the surface of the container cuts the alternating magnetic lines of force and generates an alternating current in the metal part at the bottom of the container. The eddy current causes the carriers at the bottom of the container to move irregularly at high speed. The carriers and atoms collide and rub with each other to generate heat energy, thereby realizing non-contact heating. Because the iron container itself generates heat, the heat conversion rate is particularly high, up to 95%. At present, electromagnetic heating technology has been widely used in various industrial heating occasions.
[0003] Most existing electromagnetic heating devices for plate materials are equipped with an AC electromagnetic coil outside the furnace. The electromagnetic coil is mostly wound in a ring shape outside the furnace. However, due to the skin effect, the induced current of the heated object is concentrated in the thin layer on the surface of the conductor, which will make the induced current in the center of the heated object less. In particular, the plate profile itself has a certain width, and the heating effect in the center of the plate profile is poor, resulting in the problem of uneven heating. Utility Model Content
[0004] In order to improve the uniformity of heating, the present application provides an electromagnetic heating device with a long waist-shaped hollow coil.
[0005] The present application provides a long waist-shaped hollow coil electromagnetic heating device adopts the following technical solution:
[0006] A long waist-shaped hollow coil electromagnetic heating device includes an electromagnetic coil and a furnace, the furnace is provided with a power supply, the electromagnetic coil is sleeved on the furnace and electrically connected to the power supply, the electromagnetic coil is composed of a first electromagnetic wire and a second electromagnetic wire connected together, the furnace is composed of a long plate and a side plate connected together, the first electromagnetic wire is arranged on the outside of the long plate, and the middle part of the first electromagnetic wire is bent in the direction close to the long plate, the second electromagnetic wire is arranged on the outside of the side plate, and the middle part of the second electromagnetic wire is bent in the direction away from the side plate.
[0007] By adopting the above technical solution, the power supply is an IGBT alternating power supply, the length of the first electromagnetic wire is longer than the second magnetic flux line, the width of the long plate is greater than the width of the side plate, and the first magnetic flux line is arranged at the long plate along the width direction of the plate profile. The middle part of the first electromagnetic wire is bent toward the long plate, thereby increasing the magnetic flux line density of the electromagnetic coil in the middle area of the first electromagnetic wire, thereby enhancing the electromagnetic induction effect at this position. This position is also the position where the center of the plate profile will pass during the movement and heating of the plate profile. When the plate profile moves in the furnace, the center of the plate profile is better heated to effectively reduce the impact of uneven heat caused by the edge skin effect when the magnetic flux line penetrates the plate-shaped material. At the same time, the middle part of the second electromagnetic wire is bent in the direction away from the side wall. When the plate profile moves and is heated in the furnace, the two ends of the plate profile are closest to the second electromagnetic wire. By relatively reducing the effect of the electromagnetic induction in the middle of the second electromagnetic wire, the possibility of overheating caused by excessive heating effect at both ends of the plate profile is avoided, thereby further improving the uniformity of heating.
[0008] Preferably, the first electromagnetic wire is connected to the long plate.
[0009] By adopting the above technical solution, the first electromagnetic wire is longer and is fixedly connected to the outer wall of the long plate of the furnace chamber by gluing non-conductive materials with good thermal conductivity and heat resistance. This can reduce the shaking of the first electromagnetic wire during use, thereby affecting the layout of the magnetic flux lines of the first electromagnetic wire, thereby weakening the counteracting effect of the skin effect, making it possible for heating to be uneven, and improving the heating stability and heating quality.
[0010] Preferably, a bracket is further included, wherein the bracket is provided with a mounting block, and the mounting block is connected to the long board.
[0011] By adopting the above technical solution, the long plate is fixed by the bracket and the mounting block, so that the furnace is fixed on the bracket, thereby improving the stability of the furnace fixation and reducing the possibility of movement or falling of the furnace during use.
[0012] Preferably, the bracket is provided with a connecting plate, and the connecting plate is connected to the second electromagnetic wire.
[0013] By adopting the above technical solution, the second electromagnetic wire is glued and fixedly connected to the connecting plate on the bracket using a non-conductor material with good thermal conductivity and heat resistance, thereby fixing the second electromagnetic wire, reducing the probability of the second electromagnetic wire shaking during use and affecting the heating uniformity, and ensuring the quality of heating.
[0014] Preferably, the long plate is made of non-conductive material, and the side plate is made of iron core material.
[0015] By adopting the above technical solution, the long plate is made of non-conductive material, and the side plates on both sides are made of iron core material, which attracts the edge magnetic lines of force, reduces the edge skin effect caused by the magnetic lines of force cut by the plate and strip materials through the furnace, and at the same time reduces the divergence of the magnetic lines of force and increases energy consumption.
[0016] Preferably, the second electromagnetic wire is arranged obliquely.
[0017] By adopting the above technical solution, by tilting the second electromagnetic wire, the magnetic flux lines are made to penetrate the furnace and the plate and strip materials passing through the furnace at an angle, thereby increasing the coverage area of the materials penetrated by the magnetic flux lines, thereby achieving the purpose of uniform heating, saving energy, reducing the divergence of magnetic flux lines, and increasing energy consumption.
[0018] Preferably, the first electromagnetic wire is bent in a horizontal plane.
[0019] By adopting the above technical solution, the first electromagnetic wire is bent in the horizontal plane and the second electromagnetic wire is tilted, so as to further increase the coverage area and increase the density of magnetic flux lines in the center of the electromagnetic coil. This reduces the possibility of poor heating effect at the center of the electromagnetic coil due to the excessive distance between the first electromagnetic wires on both sides caused by the tilted second electromagnetic wire, thereby further improving the uniformity of heating.
[0020] Preferably, the electromagnetic coil is provided with a ferromagnetic coating.
[0021] By adopting the above technical solution, the outward dispersion of magnetic lines of force can be shielded as much as possible, thereby reducing unnecessary energy consumption and saving energy and reducing consumption.
[0022] In summary, this application includes at least one of the following beneficial technical effects:
[0023] 1. An electromagnetic coil, a furnace, a long plate, a side plate, a power supply, a first electromagnetic wire, and a second electromagnetic wire are provided. The electromagnetic coil is powered by an alternating power supply to electromagnetically heat the plate moving in the furnace. The first electromagnetic wire, which is provided on the outside of the long plate, is arranged with a low center and high ends, so that the middle of the first electromagnetic wire is closer to the long plate, thereby increasing the electromagnetic induction intensity in the middle of the long plate, thereby improving the heating effect on the center of the heated plate and offsetting the skin effect. At the same time, the second electromagnetic wire is relatively far away from the side plate, thereby reducing the heating effect of the second electromagnetic wire on the two ends of the heated plate, reducing the probability of uneven heating caused by excessive temperature at both ends of the plate, and improving heating uniformity.
[0024] 2. By providing a bracket, a mounting block, and a connecting plate, the long plate of the furnace is fixed by the mounting plate on the bracket, and the second electromagnetic wire of the electromagnetic coil is fixed by the connecting plate on the bracket, thereby improving the stability of the furnace and the electromagnetic coil during use, reducing the possibility of heating being affected by accidental movement of the furnace or the electromagnetic coil, and improving heating stability;
[0025] 3. By setting up a ferromagnetic coating, the electromagnetic coil is enclosed and wrapped with a coating made of ferromagnetic material. On the one hand, the dispersion of magnetic lines of force is shielded as much as possible, reducing unnecessary energy consumption. At the same time, the protection strength of the electromagnetic coil surface is improved, the possibility of accidental collision damage to the electromagnetic coil is reduced, and durability is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is an overall schematic diagram of a long waist-shaped hollow coil electromagnetic heating device provided in an embodiment of the present application.
[0027] Figure 2 This is a front view of the coil and furnace after removing the bracket.
[0028] Figure 3 This is a side view of the coil and furnace after the bracket is removed.
[0029] Figure 4 It is a top view of the overall heating device.
[0030] Explanation of the accompanying drawings: 1. furnace; 11. long plate; 12. side plate; 2. electromagnetic coil; 21. first electromagnetic wire; 22. second electromagnetic wire; 23. ferromagnetic coating; 3. power supply; 4. bracket; 41. mounting block; 42. connecting plate. DETAILED DESCRIPTION
[0031] The following is combined with Figure 1-4 This application is described in further detail.
[0032] The present application discloses a long waist hollow coil electromagnetic heating device. Figures 1 to 3, which includes a furnace 1, a power supply 3, a bracket 4 and a number of electromagnetic coils 2. The electromagnetic coils 2 are provided with two layers and are sleeved on the furnace 1 and electrically connected to the IGBT alternating power supply 3. The outer sleeve of the electromagnetic coil 2 is fixed with a ferromagnetic coating 23. In this embodiment, the electromagnetic coating is fixedly provided on the outer wall of the electromagnetic coil 2. In another embodiment, the electromagnetic coating can be enclosed and wrapped around the electromagnetic coil 2 to enhance the shielding effect. The electromagnetic coil 2 is composed of two first electromagnetic wires 21 and two second electromagnetic wires 22 connected end to end. The length of the first electromagnetic wire 21 is more than twice the length of the second electromagnetic wire 22. The furnace 1 is composed of two long plates 11 and two side plates 12 fixedly connected. The side plates 12 are fixedly provided between the long plates 11. The outer walls of the side plates 12 are flush with the outer walls of the long plates 11. The long plates 11 are made of non-conductive materials, and the side plates 12 are made of iron core materials. The first electromagnetic wire 21 is positioned outside the long plate 11. The middle portion of the first electromagnetic wire 21 bends toward the long plate 11 and is bonded to the surface of the long plate 11 via a non-conductive material with good thermal conductivity and heat resistance. The second electromagnetic wire 22 is positioned outside the side plate 12. The middle portion of the second electromagnetic wire 22 bends away from the side plate 12, giving the electromagnetic coil 2 a waisted shape. The density of the magnetic flux generated within the coil gradually decreases from the center of the coil to both ends. This effectively reduces the skin effect caused by the magnetic flux penetrating the strip material, improving heating uniformity.
[0033] In order to improve the stability of the overall equipment, refer to Figure 1 and Figure 4 The bracket 4 is made of non-conductive material. Two mounting blocks 41 made of non-conductive material are provided on the top wall of the bracket 4. The top wall of the mounting block 41 is fixedly connected to the bottom wall of the long plate 11 by welding, and the side walls of the mounting block 41 are flush with the side walls of the long plate 11. Connecting plates 42 made of non-conductive material are also fixedly provided at both ends of the top wall of the bracket 4. The power supply 3 is fixedly provided on the outer wall of the connecting plate 42. The connecting plate 42 is provided with slots for connecting wiring at the location where the power supply 3 is provided, so that the connecting wires between the power supply 3 and the electromagnetic coil 2 are routed from the inside of the connecting plate 42. The inner wall of the connecting plate 42 is fixedly connected to the second electromagnetic wire 22 by gluing a non-conductive material with good thermal conductivity and heat resistance. The furnace 1 and the electromagnetic coil 2 are fixed by the bracket 4 and related structures, thereby improving the stability of the overall equipment during use.
[0034] In order to increase the coverage area of magnetic flux lines, refer to Figure 2 and Figure 3The second electromagnetic wire 22 is tilted at a 45° angle, forming a parallelogram-shaped structure from the side. The inclination of the second electromagnetic wire 22 from bottom to top is opposite to the direction of movement of the plate within the furnace 1. The first electromagnetic wire 21 is bent within the horizontal plane, with the first electromagnetic wires 21 on the upper and lower sides of the furnace 1 bending toward each other. This arrangement increases the coverage area of the electromagnetic coil 2, allowing the magnetic flux lines to penetrate the furnace 1 and the plate and strip passing through it at an angle, increasing the coverage area of the material and achieving uniform heating.
[0035] The implementation principle of a long waist-shaped hollow coil electromagnetic heating device in an embodiment of the present application is: by making the first electromagnetic wire 21 into a structure with high ends and low middle, the heating effect of the middle part of the plate is improved, offsetting the influence of the skin effect, and at the same time, the second electromagnetic wire 22 is made into a structure with low ends and high middle to avoid overheating of the two ends of the plate, and at the same time, the second magnetic line is inclined and the first electromagnetic wire 21 is bent in the horizontal plane to increase the coverage area, thereby improving the overall heating uniformity.
[0036] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A long waist-shaped hollow coil electromagnetic heating device, characterized in that: The invention comprises an electromagnetic coil (2) and a furnace (1), wherein the furnace (1) is provided with a power supply (3), the electromagnetic coil (2) is sleeved on the furnace (1) and electrically connected to the power supply (3), the electromagnetic coil (2) is composed of a first electromagnetic wire (21) and a second electromagnetic wire (22) connected together, and the furnace (1) is composed of a long plate (11) and a side plate (12) connected together, the first electromagnetic wire (21) is arranged outside the long plate (11), and the middle part of the first electromagnetic wire (21) is bent in a direction close to the long plate (11), and the second electromagnetic wire (22) is arranged outside the side plate (12), and the middle part of the second electromagnetic wire (22) is bent in a direction away from the side plate (12).
2. The long waist-shaped hollow coil electromagnetic heating device according to claim 1, characterized in that: The first electromagnetic wire (21) is connected to the long plate (11).
3. The long waist-shaped hollow coil electromagnetic heating device according to claim 2, characterized in that: It also includes a bracket (4), wherein the bracket (4) is provided with a mounting block (41), and the mounting block (41) is connected to the long board (11).
4. The long waist-shaped hollow coil electromagnetic heating device according to claim 3, characterized in that: The bracket (4) is provided with a connecting plate (42), and the connecting plate (42) is connected to the second electromagnetic wire (22).
5. The long waist-shaped hollow coil electromagnetic heating device according to claim 2, characterized in that: The long plate (11) is made of a non-conductive material, and the side plate (12) is made of an iron core material.
6. The long waist-shaped hollow coil electromagnetic heating device according to claim 1, characterized in that: The second electromagnetic wire (22) is arranged obliquely.
7. The long waist-shaped hollow coil electromagnetic heating device according to claim 6, characterized in that: The first electromagnetic wire (21) is bent in a horizontal plane.
8. The long waist-shaped hollow coil electromagnetic heating device according to claim 1, characterized in that: The electromagnetic coil (2) is provided with a ferromagnetic coating (23).