Electromagnetic heating furnace

Abstract

The invention discloses an electromagnetic heating furnace, which belongs to the field of household heating equipment and comprises a panel, a furnace barrel and a bottom plate. The furnace barrel is made of magnetic conductive materials, and an electric furnace core is arranged in the furnace barrel and is close to the inner wall of the furnace barrel. A coil is wound on the electric furnace core and is connected with a driving circuit, the driving circuit is electrified to enable the coil to generate a magnetic field, and vortex current heating is formed on the furnace barrel. According to the electromagnetic heating furnace, the electromagnetic eddy current heating principle is adopted, the furnace barrel directly heats, the heating speed is high, the furnace barrel, the panel and the bottom plate form a heat storage cavity structure, temperature is rapidly increased, nearby air is heated, and the heating effect is very good. The cooking stove is additionally arranged, so that multifunctional integration of heating and cooking is realized. The coil has a high-temperature-resistant insulation design and is safe and reliable to use.

Description

Technical Field

[0001] The present invention relates to the field of household heating stoves, in particular to an electromagnetic heating stove. Background Art

[0002] Existing electric heaters typically use heating wires to generate heat directly, either through heated air or infrared radiation. These devices suffer from slow heating rates and poor heating effectiveness. They often require a cover, which is not only difficult to clean but also poses a flammability risk. Furthermore, traditional electric heaters lack a central furnace structure, preventing overall heating and resulting in low heating efficiency. Therefore, a heating device with fast heating rates, high heating efficiency, and safety is urgently needed.

[0003] Some devices use electromagnetic induction heating, but these are often flat or open designs that don't form a cavity structure for overall heating, resulting in poor heating effectiveness. Others use water circulation for heat transfer, which is complex and carries the risk of leaks. The water must be heated before heating can occur, resulting in slow heating rates and low radiator surface temperatures, all of which are unsatisfactory.

[0004] For example, CN106765483A discloses an electromagnetic induction heating stove, which comprises a stove body and a heating cylinder arranged in the stove body, the outer side of the heating cylinder being wrapped with thermal insulation rock wool, the outer side of the thermal insulation rock wool being wound with an electromagnetic induction coil, the electromagnetic induction coil being connected to a power supply control device arranged in the stove body, a water inlet pipe being arranged at the upper end of the stove body, one end of the water inlet pipe being interconnected with the upper end of the heating cylinder, the other end of the water inlet pipe extending out of the stove body and being interconnected with a faucet, a water pumping pipe being arranged at the lower end of the stove body, one end of the water pumping pipe being interconnected with the lower end of the heating cylinder, the other end of the water pumping pipe extending out of the stove body and being connected to the water suction port of a water pump, the water outlet of the water pump being interconnected with the water inlet pipe through a return pipe, a lower control valve being arranged at the lower end of the return pipe, and a radiator being arranged on the return pipe between the lower control valve and the water inlet pipe. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned background technical difficulties and provide an electromagnetic heating stove with good heating effect and high energy efficiency.

[0006] To achieve the above-mentioned purpose, an electromagnetic heating stove includes a panel, a furnace tube and a bottom plate; the furnace tube is made of magnetic conductive material, and a coil is provided inside the furnace tube. The coil is arranged close to the inner wall of the furnace tube, and the coil is connected to a driving circuit. When the driving circuit is energized, the coil generates a magnetic field, forming an eddy current on the furnace tube to generate heat.

[0007] Furthermore, the panel, furnace drum and bottom plate form a closed cavity structure, and after the furnace drum generates heat, the temperature of the panel and bottom plate is increased through heat conduction.

[0008] Furthermore, an electric furnace core is provided in the furnace barrel. The electric furnace core is a bracket structure made of high-temperature resistant insulating material, and a groove or support body is provided on the outside of the electric furnace core for fixing the coil.

[0009] Furthermore, the coil is made of copper or nickel alloy.

[0010] Furthermore, a cooking stove is provided at the center of the panel, and a heat-insulating bottom plate is provided at the bottom of the cooking stove.

[0011] Furthermore, the driving circuit is provided with a control circuit, and the control circuit is arranged on a panel or adopts a voice control method.

[0012] Furthermore, high temperature resistant insulating material is provided between the coil and the furnace drum.

[0013] Furthermore, an anti-scalding net is provided on the outside of the furnace drum.

[0014] Furthermore, the furnace drum is made of magnetic stainless steel.

[0015] Furthermore, the cooking stove is an embedded electric heating coil structure.

[0016] The benefits of this solution include: This electromagnetic heater utilizes the principle of electromagnetic eddy current heating, generating heat directly from the furnace drum, resulting in rapid heating. The furnace drum, panel, and baseplate form a heat storage cavity, rapidly heating the surrounding air and providing excellent heating results. The addition of a cooking stove allows for integrated heating and cooking functions. The coil features a high-temperature-resistant insulation design, ensuring safe and reliable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the electromagnetic heating stove of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the electric furnace core in the electromagnetic heating furnace of the present invention.

[0019] Figure 3 A simplified schematic diagram of the circuit for the invented electromagnetic heating stove.

[0020] In the figure, 1, panel; 2, furnace body; 3, furnace core; 4, bottom plate. DETAILED DESCRIPTION

[0021] The technical solutions of the present invention are described clearly and completely below in conjunction with specific embodiments of the present invention. The described embodiments are only a portion of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0022] like Figure 1As shown, the electromagnetic heater comprises a panel 1, a furnace body 2, a furnace core 3, and a base plate 4. The furnace body 2 is a drum made of magnetically conductive material, and the furnace core 3 is tightly fitted inside the drum. A coil is wound around the drum. When the drive circuit is energized, the coil generates a magnetic field, and the drum rapidly heats up due to eddy currents. This heat conducts through the drum, raising the temperature of the panel 1 and base plate 4.

[0023] The panel 1 and the furnace body 2 can be designed as square, round, oval, etc. according to the shape of the existing heating furnace, and the bottom plate 4 can be designed as a foot box. Figure 2 As shown, the electric furnace core 3 is made of high-temperature resistant insulating material, with grooves on its outer wall for securing the coils. The coils are covered with high-temperature resistant insulating material to ensure safety. The cooking oven in the center of the panel 1 is used for cooking food, and an insulating base is located at the bottom to prevent overheating.

[0024] The circuitry of this electromagnetic heater utilizes a similar structure to existing electric heaters and induction cookers, comprising a power supply circuit, a coil drive circuit, a control circuit, and a detection circuit. The power supply circuit provides stable power to the electromagnetic heater and adapts to the operating requirements of the subsequent drive and control circuits. The power supply circuit has a total power output of approximately 2500-3000W, limiting the coil heating power after the cooking stove is started.

[0025] The power supply circuit mainly includes the following modules: Module Function Key components and parameters EMI filter circuit Suppress grid interference and prevent high-frequency noise from affecting other electrical appliances - Common-mode inductor (10mH) - X capacitor (0.1μF / 275V) - Y capacitor (2200pF / 250V) Rectifier circuit Converts alternating current (AC 220V) to direct current - Rectifier bridge (GBJ2510, 25A / 1000V) PFC power factor correction circuit Improve power factor (>0.95) and reduce harmonic pollution - Boost inductor (500μH) - MOSFET (STW20NM50) - PFC controller chip (L6562D) Filter tank circuit Smooth DC voltage to provide stable energy for inverter circuit - Electrolytic capacitor (450V / 680μF × 2 in parallel) - Film capacitor (0.47μF / 630V) Auxiliary power supply circuit Provide low voltage DC power (+5V, +12V) for control circuit and detection circuit - Switching power supply chip (VIPer22A) - Transformer (EE16 core) - Rectifier diode (1N4007) The circuit board is mounted on the baseplate to maintain a lower temperature. The IGBT module in the coil drive circuit can be cooled through external wall openings or by installing a cooling fan. The rectifier bridge, MOSFET, capacitors, and other components must be high-temperature resistant to ensure proper operation at 70°C. An NTC thermistor (such as the MF58, with a B value of 3950K) is placed on the furnace drum to monitor the temperature in real time and provide feedback to the control circuit. When the temperature exceeds a set threshold (temporarily set at 250°C), the power circuit disconnects the main power supply via a relay. Optocouplers (such as the PC817) are used between the high-frequency inverter circuit and the control circuit to prevent electromagnetic interference. The power supply wiring must be routed away from the coil to avoid voltage fluctuations caused by magnetic field coupling.

[0026] like Figure 3 This is a simplified schematic diagram of the electromagnetic heater circuit in this embodiment. The coil is made of copper or nickel alloy and can be tubular to increase the conductivity due to the skin effect. During operation, the coil is located within the furnace drum, where temperatures can reach very high, exceeding 150°C. Nickel alloy coils offer greater heat resistance, ensuring stable operation at high temperatures.

[0027] The furnace core can be made of materials such as sintered clay, ceramic, mica, or composite materials, and must withstand temperatures exceeding 300°C. The coil wire diameter is 2-4mm (nickel alloys require thicker wires) and is wound with 50 turns. The voice control circuit structure is consistent with existing electric heater solutions, utilizing the LD3320 voice recognition chip and software logic. The furnace drum is made of magnetic stainless steel, which primarily includes ferritic and martensitic stainless steels. Ferritic stainless steels such as 409, 430, and 439 have high magnetic permeability, with higher ferrite content resulting in improved magnetic permeability. Martensitic stainless steels such as 410 and 420 also have high magnetic permeability.

[0028] The panel can be fixed on the furnace drum by means of clips, screws, etc., and can be designed as a circular rotating panel. The furnace drum and the bottom plate are fixedly connected. The panel, the furnace drum and the bottom plate form a closed cavity structure. After the furnace drum is heated, the cavity temperature is increased by heat conduction, thereby achieving the effect of heating the entire furnace body.

[0029] The furnace drum houses an electric furnace core, which is a support structure made of high-temperature resistant insulating material. Its outer surface is provided with grooves or supports for securing the coils. When the furnace drum is heated, the temperature of the coils also rises, and the electric furnace core ensures the coils are securely fixed.

[0030] A cooking stove is provided at the center of the panel, and an insulating base plate is provided at the bottom of the cooking stove. The cooking stove is an embedded electric heating coil structure. The design of the cooking stove is similar to that of existing heating stoves. The cooking stove adopts an embedded electric heating coil structure with no exposed heating wire. There is also a heat transfer panel on the electric heating coil, which is safer to use. The electric heating coil is not easily oxidized and has a long service life. The drive circuit is provided with a control circuit, which is provided on the panel or foot box, or a voice control method is added. A high-temperature resistant insulating material is provided between the coil and the furnace barrel, such as high-temperature resistant insulation cotton. The main material of the high-temperature resistant insulation cotton is inorganic nano-ceramic microbeads or glass fiber insulation cotton. These materials can withstand high temperatures of up to 1000°C. An anti-scalding net is provided on the outside of the furnace barrel to prevent burns on the furnace body and ensure heating safety.

[0031] Experimental example 1. Experimental purpose: To verify the advantages of the electromagnetic heater of this application in terms of heating speed and heating effect compared with traditional electric heaters, specifically including: comparison of heating speed and heating effect.

[0032] 2. Experimental conditions Test environment: Two identical rooms of 30 m2, initial temperature 20°C (doors and windows closed) Test equipment: This application electromagnetic heater (3000W, 430 stainless steel furnace), traditional electric heating tube heater (3000W, electric heating tube exposed) Temperature measuring point: T1: Panel edge temperature (infrared thermal imager) T2: Temperature of the dummy's front face at 0.2 meters (infrared thermal imager) T3: Temperature of the back of the dummy at 0.2 meters (infrared thermal imager) T4: Room temperature at 1 meter (electronic thermometer) Test duration: 30 minutes (data recorded every 5 minutes) 3. Test data record table .

[0033] 4. Key Conclusions Analysis 1. Comparison of heating characteristics Traditional electric heating tube furnace: concentrated heating by side radiation, the front of the dummy (T2) quickly rises to 70℃, but the panel (T1) does not heat up (≤30℃), the back (T3) is only +4℃, and the room temperature rises by only 2℃.

[0034] Disadvantages: It mainly relies on infrared radiation heating, the heat is uneven, it needs to face the heat source and is easy to burn, and the overall heating efficiency is poor.

[0035] This application induction cooker: the furnace drum heats up + the panel slowly accumulates heat, the front and back of the dummy can be heated, and the room temperature near the induction cooker is increased by 8℃.

[0036] Advantages: Uniform heating through hot air convection, safe and comfortable.

[0037] 2. User scenario verification Traditional furnaces are only suitable for short-term local heating, the room temperature rises slowly, and the heating effect is not ideal; The induction cooker achieves "surround heating" by stabilizing the heat field. After 30 minutes, both the front and back of the dummy reach a comfortable temperature.

[0038] 3. Energy efficiency and safety The efficiency of the induction cooker in raising the room temperature is 4 times that of the traditional cooker (+8℃ vs +2℃); Traditional stoves have poor air heating effects and waste a lot of radiation energy, while induction cookers have significantly better thermal energy utilization.

[0039] 5. Experimental Conclusion Heating characteristics: The induction cooker panel heats up slowly (reaching 55°C in 30 minutes), and the hot air convection makes the front of the dummy reach 50°C in 10 minutes, making the overall thermal environment more stable; the traditional stove dummy's front temperature soars to 50°C in 5 minutes, but the temperature of the back hardly increases, and the actual heating effect is poor.

[0040] Comprehensive effect: The temperature difference between the front and back of the induction cooker is much better than that of the traditional stove, proving that its heat convection design is more reasonable; the room temperature at 1 meter away from the induction cooker increases by 8°C, while the traditional stove only increases by 2°C, with significantly higher energy efficiency.

[0041] Summarize: The present invention solves the pain point of traditional electric heaters, namely "local overheating and overall lack of warmth", through furnace drum eddy current heating and air convection, and has both safety and energy efficiency.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0043] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An electromagnetic heating stove, characterized in that: The invention comprises a panel (1), a furnace drum (2) and a bottom plate (4); the furnace drum (2) is made of a magnetic conductive material, a coil is provided in the furnace drum (2), the coil is arranged close to the inner wall of the furnace drum (2), and the coil is connected to a drive circuit. When the drive circuit is energized, the coil generates a magnetic field, forming an eddy current on the furnace drum (2) to generate heat.

2. The electromagnetic heating stove according to claim 1, characterized in that: The panel (1), the furnace drum (2) and the bottom plate (4) form a closed cavity structure, and when the furnace drum (2) generates heat, the temperature of the panel (1) and the bottom plate (4) is increased through heat conduction.

3. The electromagnetic heating stove according to claim 1, characterized in that: An electric furnace core (3) is provided in the furnace barrel (2). The electric furnace core (3) is a bracket structure made of a high-temperature resistant insulating material, and a groove or a support body for fixing the coil is provided on the outer side thereof.

4. The electromagnetic heating stove according to claim 1, characterized in that: The coil is made of copper or nickel alloy.

5. The electromagnetic heating stove according to claim 1, characterized in that: A cooking stove is provided at the center of the panel (1), and a heat-insulating bottom plate is provided at the bottom of the cooking stove.

6. The electromagnetic heating stove according to claim 1, characterized in that: The driving circuit is provided with a control circuit, and the control circuit is arranged on the panel (1) or adopts a voice control method.

7. The electromagnetic heating stove according to claim 1, characterized in that: A high-temperature resistant insulating material is provided between the coil and the furnace drum (2).

8. The electromagnetic heating stove according to claim 1, characterized in that: An anti-scalding net is provided on the outside of the furnace barrel (2).

9. The electromagnetic heating stove according to claim 1, characterized in that: The furnace drum (2) is made of magnetic stainless steel.

10. The electromagnetic heating stove according to claim 5, characterized in that: The cooking stove is an embedded electric heating coil structure.

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