Low no-load-loss medium-frequency coreless induction furnace

Abstract

The invention relates to a middle-frequency coreless induction furnace with low no-load loss, applied in metallurgical and casting industries, comprising furnace shell, furnace lining in melting room and induction ring. The induction ring is set between furnace lining in melting room and furnace shell and on the outside of induction ring guiding magnetic pillar is set. Two ends of the guiding magnetic pillar are connected with guiding magnetic mask plates at the fire port and the bottom respectively. The guiding magnetic pillar and mask plate are made of soft-magnetic ferrite, or guiding magnetic iron powder or soft-magnetic material with high resistance, which are provided with high guiding-magnetic ratio and low loss under higher-frequency magnetic field, by sintering and bonding. The guiding magnetic pillar is set between furnace shell and induction ring and relative guiding magnetic mask plate is set between the furnace bottom and hole. Alternation magnetic flux through the furnace shell is little so as to decrease the no-load loss of furnace greatly and because the guiding magnetic pillar and mask plate made of soft-magnetic ferrite, or guiding magnetic iron powder or soft-magnetic material with high resistance has little swirl and magnetic hysteresis loss so that no-load loss of furnace is decreased furthermore and electric power usage and furnace efficiency are improved.

Description

technical field [0001] The invention relates to an improved intermediate frequency coreless induction furnace, which is used in metallurgy and foundry industries. Background technique [0002] In the traditional coreless induction furnace structure, the magnetic flux of the intermediate frequency induction coil forms a closure along the melting zone in the furnace and the external magnetic circuit of the induction coil and the electric furnace shell. The induction current is generated by changing the magnetic flux. Although the steel-shell electric furnace with large capacity is equipped with an external yoke made of silicon steel sheets, the manufacturing process of the yoke is very complicated, and the magnetic flux of several hundred Hz is also in the iron core. The eddy current is generated on the yoke. The eddy current and hysteresis loss of the silicon steel sheet yoke make the no-load loss of the electric furnace larger. The yoke itself also needs water cooling, and t...

AI Technical Summary

Problems solved by technology

[0002] In the traditional coreless induction furnace structure, the magnetic flux of the intermediate frequency induction coil forms a closure along the melting zone in the furnace and the external magnetic circuit of the induction coil and the electric furnace shell. The induction current is generated by changing the magnetic flux. Although the steel-shell electric furnace with large capacity is equipped with an external yoke made of silicon steel sheets, the manufacturing process of the yoke is very complicated, and the magnetic flux of several hundred Hz is also in the iron core. The eddy current is generated on the yoke. The eddy current and hysteresis loss of the silicon steel sheet yoke make the no-load loss of the electric furnace larger. The yoke itself also needs water cooling, and the bottom and upper cover of the electric furnace shell are also generated due to no magnetic shielding. Eddy current induction, so the no-load loss of the electric furnace is relatively large, how to further reduce the no-load loss of the electric furnace and improve the utilization rate of electric energy is a big problem to be solved urgently

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