Intermediate frequency furnace penetration alarm device
By introducing mica paper and asbestos board into the protective layer of the intermediate frequency furnace, the short circuit problem between the induction coil and the stainless steel wire mesh was solved, which improved the production efficiency of the intermediate frequency furnace, utilized the heat of the flue gas, and reduced the downtime of the intermediate frequency furnace and the cost of refractory materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIN JIANG BA GANG JIA YU GONG MAO ZONG GONG SI
- Filing Date
- 2025-04-30
- Publication Date
- 2026-05-15
AI Technical Summary
During the smelting process in an intermediate frequency furnace, the induction coil and the stainless steel wire mesh are prone to short circuit breakdown due to insufficient insulation, which can cause the intermediate frequency furnace to shut down and the furnace lining material to corrode, affecting production efficiency and cost.
Mica paper and asbestos board are introduced into the protective layer of the medium-frequency furnace. The insulation of the mica paper and the high temperature resistance of the asbestos board are used to prevent short circuits. At the same time, when the flue gas is discharged, heat is absorbed through the heat pipe and the heat of the flue gas is used to heat the water flow.
It effectively prevents short circuits between the induction coil and the stainless steel wire mesh, improves the production efficiency of the medium-frequency furnace, reduces the flue gas temperature and utilizes the heat of the flue gas, and reduces the downtime of the medium-frequency furnace and the cost of refractory materials.
Smart Images
Figure CN224246712U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of alarm devices for medium-frequency furnaces, specifically a furnace penetration alarm device for medium-frequency furnaces. Background Technology
[0002] An intermediate frequency induction furnace is a power supply device that converts 50Hz AC power into intermediate frequency (300Hz to 1000Hz). It rectifies three-phase AC power into DC power, then converts the DC power into an adjustable intermediate frequency current, supplying this current to a capacitor and the induction coil. This generates high-density magnetic lines of force in the induction coil, cutting through the metal material placed within it. This induces large eddy currents in the metal, heating it using the principle of electromagnetic induction, melting it into a high-temperature liquid. Because the principle of intermediate frequency induction heating is electromagnetic induction, the heat is generated within the workpiece itself. Heating begins as soon as the furnace is powered on, with a heating rate of up to 30℃ / minute. Furthermore, it is simple to operate and does not require specialized workers, making it widely used in the foundry industry.
[0003] The temperature of the molten metal in the medium-frequency furnace is typically 1400℃-1600℃. Therefore, a furnace lining material is placed between the high-temperature liquid and the induction coil. Furthermore, circulating water is used to cool the induction coil, with a pressure of 0.2MPa-0.25MPa (see...). Figure 1The high-density magnetic lines of force generated in the induction coil agitate the molten metal, causing it to erode the furnace lining material. The high temperature of the molten metal also corrodes the lining, gradually thinning it. When the lining becomes too thin, the molten metal may leak out and come into contact with the induction coil. Since the induction coil is made of copper, a voltage of 0-2500V is applied during melting in the medium-frequency furnace. This can cause a short circuit between the upper and lower turns of the induction coil, resulting in coil breakdown and the ejection of circulating water, causing the medium-frequency furnace to shut down. This phenomenon is commonly known as "furnace penetration." Once furnace penetration occurs, the medium-frequency furnace should be immediately shut down, the circulating water supply stopped, and the molten metal drained from the furnace. Failure to address this promptly or using improper methods can lead to further complications. This could lead to an explosion, posing a significant hazard. Therefore, a furnace penetration alarm device is necessary. During the smelting process in an intermediate frequency furnace, the induction coil is supplied with a voltage of 0-2500V. The stainless steel wire mesh is only insulated from the intermediate frequency induction coil by a layer of asbestos cloth approximately 2mm thick and a layer of coil mortar approximately 3mm thick. Due to the presence of residual Fe elements in the coil mortar, the insulation between the mortar and the asbestos cloth is poor. Consequently, during the operation of the intermediate frequency furnace, insufficient insulation can cause a breakdown between the stainless steel wire mesh and the intermediate frequency induction coil, resulting in a short circuit and "sparking." In severe cases, this can lead to a breakdown and water leakage accident in the intermediate frequency induction coil. It is necessary to remove and repair the intermediate frequency furnace lining and weld the induction coil, causing the intermediate frequency furnace to shut down, affecting production efficiency, and also resulting in a short furnace lining life and high refractory material costs. In view of this, we propose an intermediate frequency furnace penetration alarm device. Utility Model Content
[0004] The purpose of this invention is to provide a furnace penetration alarm device for medium-frequency furnaces to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a medium-frequency furnace through-furnace alarm device, comprising a furnace brick, a furnace body fixedly connected to the upper surface of the furnace brick, a furnace lining material disposed inside the furnace body, a protective layer disposed on the outer surface of the furnace lining material, an induction coil disposed on the outer surface of the protective layer, the protective layer being composed of a first asbestos cloth, a stainless steel wire mesh, an asbestos board, mica paper, a second asbestos cloth, and coil putty, the first asbestos cloth being adhered to the outer surface of the furnace lining material, the stainless steel wire mesh being adhered to the outer side of the first asbestos cloth, the asbestos board being adhered to the outer side of the stainless steel wire mesh, the mica paper being adhered to the outer side of the asbestos board, the second asbestos cloth being adhered to the outer side of the mica paper, and the coil putty being adhered to the outer side of the second asbestos cloth.
[0006] Preferably, a steel outlet is fixedly connected to the outer surface of the furnace body, the steel outlet is connected to the interior of the furnace body, a closed door is provided on the furnace body, a transmission pipe is fixedly connected to the upper surface of the closed door, and a filter box is fixedly connected to the upper surface of the transmission pipe.
[0007] Preferably, the lower end of the transmission pipe extends out of the lower surface of the closed door, and activated carbon packing is fixedly connected to the inner wall of the filter box, with glass fiber packing disposed below the activated carbon packing.
[0008] Preferably, a discharge pipe is fixedly connected to the upper surface of the filter box, and a column is fixedly connected to the upper surface of the discharge pipe.
[0009] Preferably, a conical block is fixedly connected to the upper end of the column, an extension ring is fixedly connected to the lower surface of the conical block, and a heat-conducting pipe is fixedly connected to the inner wall of the transmission pipe.
[0010] Preferably, the end of the heat-conducting pipe extends outside the transmission pipe, and a heat insulation cover is fixedly connected to the upper surface of the furnace body.
[0011] Preferably, a water pipe is provided between the heat insulation cover and the transmission pipe, and an installation plate is fitted on the outer surface of the filter box.
[0012] Preferably, a support column is fixedly connected to the lower surface of the mounting plate, and the lower end of the support column is fixedly connected to the upper surface of the furnace body.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0014] This invention utilizes mica paper to prevent short circuits between the induction coil and stainless steel wire mesh in a medium-frequency furnace. Furthermore, the high-temperature resistance of asbestos board prevents the mica paper from carbonizing and causing insulation failure. This solves the problem of "arcing" caused by short circuits between the stainless steel wire mesh and the medium-frequency induction coil, thereby improving the production efficiency of the medium-frequency furnace.
[0015] This invention can not only filter flue gas during exhaust, but also absorb the heat of the flue gas through a heat-conducting pipe and a water pipe before filtration, thereby reducing the flue gas temperature and utilizing the heat of the flue gas. Attached Figure Description
[0016] Figure 1 This is a cross-sectional view of the furnace body of this utility model;
[0017] Figure 2 This is a cross-sectional schematic diagram of the filter box of this utility model;
[0018] Figure 3 This is a schematic diagram of the protective layer of this utility model;
[0019] Figure 4 for Figure 2 Enlarged view of point A in the middle.
[0020] In the diagram: 1. Furnace brick; 2. Furnace body; 3. Furnace lining material; 4. Protective layer; 5. First asbestos cloth; 6. Stainless steel wire mesh; 7. Asbestos board; 8. Mica paper; 9. Second asbestos cloth; 10. Coil putty; 11. Steel tapping port; 12. Sealing door; 13. Transmission pipe; 14. Filter box; 15. Activated carbon packing; 16. Glass fiber packing; 17. Discharge pipe; 18. Column; 19. Conical block; 20. Extension ring; 21. Heat conducting pipe; 22. Heat insulation cover; 23. Induction coil; 24. Water pipe; 25. Mounting plate; 26. Support column. Detailed Implementation
[0021] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.
[0022] Please see Figures 1-4 As shown, a medium-frequency furnace through-furnace alarm device includes a furnace brick 1, a furnace body 2 fixedly connected to the upper surface of the furnace brick 1, a furnace lining material 3 inside the furnace body 2, a protective layer 4 on the outer surface of the furnace lining material 3, and an induction coil 23 on the outer surface of the protective layer 4. The protective layer 4 is composed of a first asbestos cloth 5, a stainless steel wire mesh 6, an asbestos board 7, mica paper 8, a second asbestos cloth 9, and coil putty 10. The first asbestos cloth 5 is adhered to the outer surface of the furnace lining material 3, and the stainless steel wire mesh 6 is adhered to the outer side of the first asbestos cloth 5. The asbestos board 7 is bonded to the outside of the stainless steel wire mesh 6, the mica paper 8 is bonded to the outside of the asbestos board 7, the second asbestos cloth 9 is bonded to the outside of the mica paper 8, and the coil putty 10 is bonded to the outside of the second asbestos cloth 9. The mica paper 8 can be used to prevent short circuits between the induction coil 23 of the medium frequency furnace and the stainless steel wire mesh 6. In addition, the high temperature resistance of the asbestos board 7 can prevent the mica paper 8 from carbonizing and causing insulation failure. This can solve the problem of "arcing" caused by short circuits between the stainless steel wire mesh 6 and the medium frequency induction coil 23, and improve the production efficiency of the medium frequency furnace.
[0023] Furthermore, a steel outlet 11 is fixedly connected to the outer surface of the furnace body 2, and the steel outlet 11 communicates with the interior of the furnace body 2. A closed door 12 is provided on the furnace body 2. A transmission pipe 13 is fixedly connected to the upper surface of the closed door 12. A filter box 14 is fixedly connected to the upper surface of the transmission pipe 13. The lower end of the transmission pipe 13 extends out of the lower surface of the closed door 12. Activated carbon packing 15 is fixedly connected to the inner wall of the filter box 14. Glass fiber packing 16 is provided below the activated carbon packing 15. A discharge pipe 17 is fixedly connected to the upper surface of the filter box 14. A column 18 is fixedly connected to the upper surface of the discharge pipe 17. A conical block 19 is fixedly connected to the upper end of the column 18. The lower surface of the conical block 19... An extension ring 20 is fixedly connected to the surface of the furnace body 2. A heat-conducting pipe 21 is fixedly connected to the inner wall of the transmission pipe 13. The end of the heat-conducting pipe 21 extends out of the outside of the transmission pipe 13. A heat insulation cover 22 is fixedly connected to the upper surface of the furnace body 2. A water pipe 24 is provided between the heat insulation cover 22 and the transmission pipe 13. An installation plate 25 is fitted on the outer surface of the filter box 14. A support column 26 is fixedly connected to the lower surface of the installation plate 25. The lower end of the support column 26 is fixedly connected to the upper surface of the furnace body 2. This not only filters the flue gas when it is discharged, but also absorbs the heat of the flue gas through the heat-conducting pipe 21 and the water pipe 24 before the flue gas is filtered, thereby reducing the temperature of the flue gas and utilizing the heat of the flue gas.
[0024] Working principle: By adding a layer of mica paper 8 and a 1mm thick asbestos board 7 between the induction coil 23 and the stainless steel wire mesh 6 in the medium-frequency furnace, the mica paper 8 is used because it is a special type of paper made from natural mica minerals and has excellent insulation properties, effectively preventing short circuits between the induction coil 23 and the stainless steel wire mesh 6. The asbestos board 7 is used because it is made from asbestos, glass fiber, clay, and other materials and can withstand temperatures of around 1400℃. Therefore, it prevents the mica paper 8 from carbonizing due to the high temperature during the melting process in the medium-frequency furnace, which would cause a short circuit between the induction coil 23 and the stainless steel wire mesh 6. Meanwhile, the harmful fumes generated during heating are discharged through the transmission pipe 13. When the high-temperature harmful fumes come into contact with the heat-conducting pipe 21, part of the heat is absorbed by the heat-conducting pipe 21 and transferred to the water pipe 24. The heat of the fumes is used to heat the water flow inside the water pipe 24, avoiding the waste of the fumes' temperature. After the fumes continue to move, they come into contact with the glass fiber filler 16, which adsorbs large particles in the fumes. In the subsequent process, the activated carbon filler 15 adsorbs harmful substances in the fumes. The filtered fumes are discharged through the discharge pipe 17. The cone block 19 and the extension ring 20 are used to effectively prevent external debris from entering through the discharge pipe 17.
[0025] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A medium-frequency furnace perforation alarm device, comprising furnace bricks (1), characterized in that, A furnace body (2) is fixedly connected to the upper surface of the furnace brick (1). A furnace lining material (3) is provided inside the furnace body (2). A protective layer (4) is provided on the outer surface of the furnace lining material (3). An induction coil (23) is provided on the outer surface of the protective layer (4). The protective layer (4) is composed of a first asbestos cloth (5), a stainless steel wire mesh (6), an asbestos board (7), a mica paper (8), a second asbestos cloth (9), and coil putty (10). The first asbestos cloth (5) is bonded to the outer surface of the furnace lining material (3). The stainless steel wire mesh (6) is bonded to the outside of the first asbestos cloth (5). The asbestos board (7) is bonded to the outside of the stainless steel wire mesh (6). The mica paper (8) is bonded to the outside of the asbestos board (7). The second asbestos cloth (9) is bonded to the outside of the mica paper (8). The coil putty (10) is bonded to the outside of the second asbestos cloth (9).
2. The medium-frequency furnace perforation alarm device according to claim 1, characterized in that: The outer surface of the furnace body (2) is fixedly connected to a steel outlet (11), which is connected to the interior of the furnace body (2). A closed door (12) is provided on the furnace body (2), and a transmission pipe (13) is fixedly connected to the upper surface of the closed door (12). A filter box (14) is fixedly connected to the upper surface of the transmission pipe (13).
3. The medium-frequency furnace perforation alarm device according to claim 2, characterized in that: The lower end of the transmission pipe (13) extends out to the lower surface of the closed door (12), and the inner wall of the filter box (14) is fixedly connected with activated carbon packing (15), and glass fiber packing (16) is provided on the lower side of the activated carbon packing (15).
4. The medium-frequency furnace perforation alarm device according to claim 3, characterized in that: The upper surface of the filter box (14) is fixedly connected to a discharge pipe (17), and the upper surface of the discharge pipe (17) is fixedly connected to a column (18).
5. The medium-frequency furnace perforation alarm device according to claim 4, characterized in that: A conical block (19) is fixedly connected to the upper end of the column (18), an extension ring (20) is fixedly connected to the lower surface of the conical block (19), and a heat-conducting pipe (21) is fixedly connected to the inner wall of the transmission pipe (13).
6. The furnace penetration alarm device for a medium-frequency furnace according to claim 5, characterized in that: The end of the heat pipe (21) extends out of the outside of the transmission pipe (13), and a heat insulation cover (22) is fixedly connected to the upper surface of the furnace body (2).
7. The medium-frequency furnace perforation alarm device according to claim 6, characterized in that: A water pipe (24) is provided between the heat insulation cover (22) and the transmission pipe (13), and an installation plate (25) is fitted on the outer surface of the filter box (14).
8. The furnace penetration alarm device for a medium-frequency furnace according to claim 7, characterized in that: The lower surface of the mounting plate (25) is fixedly connected to a support column (26), and the lower end of the support column (26) is fixedly connected to the upper surface of the furnace body (2).