Configuration selection method of intermediate frequency power supply and induction melting furnace

Using induction melting furnace to achieve batch melting process can supply the output power is kept at the maximum charge from the heated before casting until power . However, when molten iron is tapped , there is no power output or only a small amount of power output in the induction melting furnace to maintain a certain pouring temperature. To accommodate different casting process needs, but also to increase the power using the power of the full rate, a reasonable choice medium frequency power induction melting furnace disposed, it is set out in the table presented below.

Example of configuration scheme of intermediate frequency power supply and induction melting furnace

Serial number	Configuration	Comment
1	Single power supply with single furnace	Simple and reliable, suitable for induction melting furnace liquid metal melted and rapidly emptied, and then re-feeding the molten operating conditions, operations or infrequent occasions. It is only suitable for induction melting furnaces with small capacity and lower power .
2	Single power supply with two furnaces (switched by switch)	Common economic configuration scheme. One induction melting furnace is used for melting, and the other is for pouring or repairing and building furnaces. In the small-capacity pouring operation for multiple times, the power supply for the melting operation induction melting furnace can be switched to the pouring induction melting furnace in a short time for rapid heating to compensate for the drop in the pouring temperature. The alternate operation of the two induction melting furnaces (melting, pouring, and feeding operations) ensures the continuous supply of high-temperature qualified molten metal to the pouring line. The operating power utilization factor ( K2 value) of this configuration scheme is relatively high.
3	Two power supplies (melting power supply and heat preservation power supply) with two furnaces (switched by switch)	The configuration scheme adopts SCR full-bridge parallel inverter solid power supply, and realizes that two induction melting furnaces are alternately connected with the melting power supply and the heat preservation power supply through the switch . This scheme is currently widely accepted and adopted by users, and it can achieve the same effect as the configuration scheme 5 , but the investment is greatly reduced. The power switch is completed by means of an electric switch, which is convenient to operate and has high working reliability. The disadvantage of this solution is that in order to work with the same induction coil, the heat preservation power supply needs to work at a frequency slightly higher than the melting power supply. As a result, the stirring effect during the alloying treatment may be small, and sometimes it takes a short time to switch the melting power source to enhance the alloying process. The operating power utilization factor ( K2 value) of this configuration scheme is relatively high.
4	Single dual power supply with two furnaces	1. Each induction melting furnace can select the appropriate power according to its own working conditions; 2. No mechanical switch, high working reliability; 3. The operating power utilization factor ( K2 value) is high, theoretically up to 1.00 , which greatly improves the productivity of the induction melting furnace ; 4. Since the half-bridge series inverter solid power supply is used, it can always operate at a constant power during the entire melting process, so its power utilization factor ( K1 value, see below) is also high; 5. A single power supply requires only one transformer and cooling device. Compared with Scheme 3 , the total installed capacity of the main transformer is small and the space occupied is also small.