发明名称 |
APPARATUS TO DETERMINE THE LEVEL OF LIQUID MELT IN AN ELECTRIC INDUCTION-FURNACE |
摘要 |
1466217 Liquid level detector AEGELOTHERM GmbH 22 May 1975 [31 May 1974] 22364/75 Heading G1N An electrical induction furnace for heating liquid electrically conducting materials comprises a crucible 1 surrounded in the region of the melt 3 by a plurality of turns of an induction heating coil 2 connected to a source of A.C. 4 and a liquid level sensing device including indicating means responsive to a change in electrical potential between turns of the induction coil. Thus a pair of adjacent turns is connected across the primary of a transformer 20 via e.g. taps 2<SP>1</SP>, 2<SP>11</SP>, the transformer secondary winding connecting via rectifier 21 to resistor 22. A direct current proportional to the alternating current in the coil 2 is obtained by current transformer 14, and rectifier 15, producing a corresponding voltage across resistor 16. The voltages across resistors 16, 22 are compared in a circuit containing resistors 23, 24, If they are unequal, the difference voltage at the output of amplifier 26 causes an indication from luminous diode e.g. 27, which indicates a change in coil impedence due to melt entering the space between the respective pair of turns. |
申请公布号 |
HU172315(B) |
申请公布日期 |
1978.08.28 |
申请号 |
HU1975AE00447 |
申请日期 |
1975.05.30 |
申请人 |
AEG-ELOTHERM GMBH,DE |
发明人 |
KOEHLER,HENNING,DE;MORKRAMER,KARL-LUDWIG,DE;CHRISTOU,SPYRIDION,GR |
分类号 |
H05B6/06;F27B14/20;F27D1/16;F27D11/00;F27D21/00;F27D21/04;G01F23/26 |
主分类号 |
H05B6/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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