What does medium frequency induction heating equipment consist of? What role does it play?

The editor will answer for you: The current density of medium frequency induction heating equipment is very high. Special-shaped copper tubes must be wound into coils of various shapes. The copper tubes are cooled by water. There is a temperature-resistant furnace lining between the workpiece and the coil, and they are assembled together.

(1) The copper tube must be made of high-quality copper material with excellent electrical conductivity. The smaller the impurities, the better. It is soft in the annealed state and not easy to break.

(2) Refractory furnace lining is usually composed of quartz sand. The higher the Al203 content, the higher its temperature resistance, good temperature resistance, poor thermal conductivity, high thermal efficiency, good temperature resistance, and the thickness of the furnace lining can be reduced. If the electrical efficiency is improved, the overall efficiency will be high. A very important factor in the low energy consumption of small diameters is that the thickness of the furnace lining cannot be made very thin. When workpieces of different diameters are heated in the same induction furnace, the energy consumption is always lower when the diameter is larger, and the energy consumption is higher when the diameter is smaller. 

(3) The end plate of the medium frequency induction heating equipment is made of copper. Its main function is to prevent the scattering of electricity and to open the opening to reduce the loss of the copper end plate.

(4) In its structure, since current flows through the coil and the workpiece at the same time, the electric force between them is quite large. The workpiece moves in the furnace lining on the coil and has to bear the pressure of the workpiece, so the coil turns must be tightened. , to prevent movement and short circuit between coils. This fastening must be firm, otherwise low-frequency vibration will occur and cause noise. Therefore, the coil turns must be insulated and fastened, and must be clamped and fixed with the end plate, like a complete solid. Frequently, power frequency induction heating furnaces often use glass fiber tapes and other insulating composite material tapes to wrap the coil copper tubes and dip them in paint to make the coil structure tight and prevent low-frequency vibration. The smaller the turn spacing, the higher the efficiency.

(5) The water path of the coil should have sufficient number of water paths. The principle is that water flows in the water pipe to form a turbulent flow. The water path should not have right-angle bends. It will reduce the flow and speed of the water flow and reduce the cooling effect. The judgment method is that the water in each branch has a certain water temperature, and the flow water temperature in each branch is similar. If the water temperature in one branch is too high, there may be welding slag or impurities blocking it during operation. Therefore, the induction furnace must monitor and control the temperature of each branch. The water temperature in each branch is preferably controlled at 50°C. If the cooling water at an excessively high temperature vaporizes on the inner side of the copper tube, the cooling effect will be greatly reduced. If the temperature is too high, scaling will occur, and eventually the furnace coil will be damaged due to overheating.

(6) Furnace lining materials should be prevented from falling and cracking. The reason is that the raw materials are not up to standard. Furnace lining materials are generally refractory cement. Once the cement absorbs moisture, it will become powdery and fall off in pieces. If the technology is not in place, refractory cement is similar to ordinary building cement. It requires maintenance and requires a lot of time. This maintenance is performed in a humid environment. The maintenance time is about 48 hours. There should be no slurry. Insufficient maintenance time or slurry will inevitably cause cracking. There are two methods for furnace lining: drying and non-drying. For a long furnace life, furnace lining drying is very important. The core is slow drying. For long-term 36-hour drying at low temperature, the initial temperature rise must be very slow.

(7) The tap joints of each branch of the medium frequency induction heating equipment and the water branch are welded with silver copper welding to ensure that the welding is firm and impermeable. The water channel is a rubber tube, and plastic tubes are not used. Plastic tubes have poor sealing performance.

(8) It is generally equipped with water-flow guide rails. The life of the guide rails depends on the surfacing material and thickness. It is not recommended to use the spraying method to pile up wear-resistant materials, because the spray wear-resistant powder formula is usually a single stainless steel, which is not as comprehensive as the high-temperature wear-resistant welding rod. The formula of the welding rod is comprehensive.