เตาแบบเหนี่ยวนำเป็นอุปกรณ์ที่ใช้กระแสไฟฟ้าความถี่ขนาดกลางสำหรับการให้ความร้อนแบบเหนี่ยวนำ, widely used in metal melting, heating, และการบำบัดความร้อน. Its main components and their respective functions are as follows.
Furnace Body Components
- คอยล์เหนี่ยวนำ:
- Made of wound copper tubing, it is the key component for generating the medium-frequency magnetic field.
- When medium-frequency current is passed through it, an alternating magnetic field is generated, inducing heat in the furnace charge.
- Furnace Lining:
- Made of refractory materials (such as silica sand, alumina, ฯลฯ), it protects the induction coil and confines the molten metal.
- It has high-temperature resistance, insulation, and thermal insulation functions.
- Furnace Shell:
- Available in steel and aluminum shells, it serves as the outer casing of the furnace, providing support and protection.
- Steel shell furnaces are robust and suitable for large furnaces; aluminum shell furnaces are lightweight and flexible, suitable for medium and small furnaces.
- Magnetic Yoke:
- Made of laminated silicon steel sheets, it is used to converge and guide magnetic lines, improve heating efficiency, and reduce magnetic field leakage.
- Steel shell furnaces usually have magnetic yokes, while aluminum shell furnaces do not.
- Tilting Mechanism:
- Used to pour molten metal, available in hydraulic and mechanical tilting mechanisms.
- Hydraulic tilting provides smooth pouring, suitable for large furnaces; mechanical tilting has a simple structure, suitable for medium and small furnaces.
Electrical Components
- Medium-Frequency Power Supply Cabinet:
- The core control component of the induction furnace, including rectifier circuits, inverter circuits, and control circuits.
- Converts industrial frequency alternating current to medium-frequency alternating current and controls output power and frequency.
- Compensation Capacitor Bank:
- Used to compensate for the inductive reactance of the induction coil, improve the power factor, and reduce power loss.
- Water-Cooled Cables:
- Used to connect the medium-frequency power supply and the induction coil, transmit medium-frequency current, and cool the induction coil.
ระบบทำความเย็น
- Cooling Water System:
- Including water pumps, water tanks, cooling towers, ฯลฯ, used to cool the induction coil, medium-frequency power supply, and compensation capacitors.
- Ensures stable operation of the equipment at high temperatures.
Control and Safety Systems
- ระบบควบคุม:
- Including PLC controllers, touch screens, ฯลฯ, used to control the operating parameters of the induction furnace, such as power, ความถี่, and temperature.
- Enables automatic control and monitoring.
- ความปลอดภัย Protection System:
- Including overcurrent protection, overvoltage protection, overheating protection, furnace leakage alarms, ฯลฯ, used to protect equipment and operator safety.
หลักการทำงานของเตาเหนี่ยวนำ
The working principle of an induction furnace is electromagnetic induction heating. When medium-frequency alternating current is passed through the induction coil, an alternating magnetic field is generated. This magnetic field penetrates the furnace charge, inducing eddy currents inside the charge. The eddy currents generate resistance heat inside the charge, thereby heating and melting the charge.
