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公开(公告)号：US3885082A
公开(公告)日：1975-05-20
申请号：US46169374
申请日：1974-04-17
Applicant: ASEA AB
Inventor： HANAS BERTIL
Abstract: An electric arc furnace has a side wall lining with at least one portion bombarded by the arc flare from one of the furnace arcing electrodes. A magnet is positioned on the outside of this portion and ferro-magnetic particles are fed to its inside, the magnet forming a magnetic flux field traveling through this lining portion and on the latter''s inside magnetically holding the particles to form an arc flare shield protecting this portion''s inside from the arc flare. As the particles heat to their Curie point temperatures, they become non-magnetic and fall into the melt of the furnace, a supply of fresh and relatively cold particles being fed to the flux field as required to maintain the efectiveness of the arc flare shield formed by the particles. The wall thickness of this portion is reduced from its outside inwardly to form a recess in its outside and in which the magnet is positioned to reduce the distance the flux field must travel to the inside to hold the ferro-magnetic particles. Between the magnet and this thin wall portion a water cooled plate is positioned to cool the thin wall portion of the lining. In this way the travel path of the magnetic flux is reduced in length without risking possible overheating of the lining, permitting the use of a less powerful magnet construction, this being an electromagnet and requiring electric solenoids, a core or cores with pole pieces and a suitable mounting arrangement. A temperature measurement sensor is installed in the thin wall of the lining portion protected by the flare shield, and equipment is provided for controlling the feed rate of the ferro-magnetic particles which form the shield, automatically in response to the temperature measurements obtained from this sensor, this assuring maintenance of the effectiveness of the shield. The water-cooled plate internally has magnetic pole piece extensions for the pole pieces for the electromagnet core or cores and which form magnetic paths for the flux which must travel through the watercooled box.
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公开(公告)号：US3900695A
公开(公告)日：1975-08-19
申请号：US47060474
申请日：1974-05-16
Applicant: ASEA AB
Inventor： ANDERSSON CONNY , HANAS BERTIL , KORSELL TORSTEN , NILSSON JAN
IPC: H01F27/28 , B21C23/00 , B21C23/22 , H01B1/02 , H01F5/00 , H01F27/08 , H01F27/16 , H02K3/22 , H05B6/36 , H05B5/12
CPC classification number: H01F5/00 , B21C23/007 , B21C23/22 , H01B1/026 , H05B6/367
Abstract: An electric induction furnace has an inductor coil formed from a tubular conductor through which cooling water may be flowed, and which is made with an inner layer of corrosion-resisting copper or copper alloy and an outer layer of aluminum or aluminum alloy and which, although oxidizable in air, forms an electrically nonconductive oxide layer eliminating the risk of short-circuiting between the coil convolutions. Material costs are reduced by making the aluminum layer considerably thicker than the copper layer. The two layers are integrated under high mechanical pressure during the manufacture of the conductor, the electrical resistance between the interfaces of the two layers being negligible.
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公开(公告)号：US3883677A
公开(公告)日：1975-05-13
申请号：US45835374
申请日：1974-04-05
Applicant: ASEA AB
Inventor： HANAS BERTIL , MARCHNER JAN
Abstract: An electric arc furnace has a side wall lining with at least one portion bombarded by the arc flare from one of the furnace arcing electrodes. A magnet is positioned on the outside of this portion and ferro-magnetic particles are fed to its inside, the magnet forming a magnetic flux field traveling through this lining portion and on the latter''s inside magnetically holding the particles to form an arc flare shield protecting this portion''s inside from the arc flare. As the particles heat to their Curie point temperatures, they become non-magnetic and fall into the melt of the furnace, a supply of fresh and relatively cold particles being fed to the flux field as required to maintain the effectiveness of the arc flare shield formed by the particles. The wall thickness of this portion is reduced from its outside inwardly to form a recess in its outside and in which the magnet is positioned to reduce the distance the flux field must travel to the inside to hold the ferro-magnetic particles. Between the magnet and this thin wall portion a water cooled plate is positioned to cool the thin wall portion of the lining. In this way the travel path of the magnetic flux is reduced in length without risking possible overheating of the lining, permitting the use of a less powerful magnet construction, this being an electromagnet and requiring electric solenoids, a core or cores with pole pieces and a suitable mounting arrangement. A temperature measurement sensor is installed in the thin wall of the lining portion protected by the flare shield, and equipment is provided for controlling the feed rate of the ferro-magnetic particles which form the shield, automatically in response to the temperature measurements obtained from this sensor, this assuring maintenance of the effectiveness of the shield. The water-cooled plate may be made of non-magnetic metal to avoid interference with the flux travel through the plate.
Abstract translation: 电弧炉具有侧壁，其中至少一部分由来自一个炉弧电极的电弧火炬轰击。 磁体位于该部分的外侧，铁磁性颗粒被馈送到其内部，磁体形成穿过该内衬部分的磁通场，并在磁体上形成磁力保持颗粒以形成保护该磁体的弧形屏蔽 部分内部的电弧火炬。 当颗粒加热到居里点温度时，它们变得非磁性并且落入炉的熔体中，根据需要将新鲜和相对较冷的颗粒供给到磁通场，以保持形成的弧形光阑屏蔽的有效性 由颗粒。 该部分的壁厚从其外部向内减小以在其外部形成凹部，并且其中磁体被定位成减小磁通场必须行进到内部以保持铁磁性颗粒的距离。 在磁体和该薄壁部分之间，定位水冷板以冷却衬里的薄壁部分。 以这种方式，磁通量的行进路径的长度减小，而不会冒着可能的内衬过热风险，允许使用不太强大的磁体结构，这是一种电磁体，并且需要电磁螺线管，具有极片的芯或芯 合适的安装方式。 温度测量传感器安装在由火炬防护罩保护的衬里部分的薄壁中，并且提供设备以响应于从其获得的温度测量值自动地控制形成屏蔽的铁磁性颗粒的进料速率 传感器，这样保证了屏蔽的有效性。 水冷板可以由非磁性金属制成，以避免与通过板的助焊剂行进的干扰。
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公开(公告)号：US3536124A
公开(公告)日：1970-10-27
申请号：US3536124D
申请日：1967-04-06
Applicant: ASEA AB
Inventor： HANAS BERTIL , FLINTH RUNE
IPC: B22D11/18
CPC classification number: B22D11/187 , B22D11/183
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