JPS6351789B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic stirring device used in continuous casting equipment to stir molten steel by electromagnetic induction.

The power frequency of an electromagnetic stirring device varies depending on its installation location. Particularly in the case of an electromagnetic stirring device in a mold, since the mold is constituted by a copper tube, it is well known that the power supply frequency is set to a low frequency of several Hz to several tens of Hz. Also, compared to a typical induction motor, a current several times the starting current constantly flows through it, and because the frequency is low, the electromagnetic force acting on the windings has a large absolute value and a considerably large amplitude. Therefore, the induction coil is required to have mechanical strength against electromagnetic force vibration. Furthermore, in order to improve the reliability of the insulation, it is necessary to increase the thickness of the insulator, but this reduces the cooling effect, which is contradictory to the reliability. As described above, electromagnetic stirring devices are required to have high mechanical strength, reliability, and cooling effect.

In this invention, an induction coil is wound around each of six protruding magnetic poles provided on the inner periphery of an iron core, and the induction coil for each magnetic pole is further divided in the radial direction between each of the n-divided unit coils. In this case, a vent tube made of a straight rectangular tube is inserted, and each of the unit coils is hardened by vacuum impregnation with an insulating resin, and a triangular or trapezoidal structure is installed between each of the induction coils. A spacer is installed to press and hold the side surface of the induction coil, and a triangular or trapezoidal wedge is installed between each magnetic pole to press and hold the inner circumferential surface of the induction coil, and a wedge that protrudes from both ends of the iron core is installed. A sealed water chamber that covers the coil end is constructed using a support stand and a cover.
It is an object of the present invention to provide an electromagnetic stirring device that is mechanically strong, has high insulation reliability, has a simple structure, and has a high cooling effect by configuring water to flow from this water chamber through the vent tube. It is said that

An embodiment of the present invention will be described below based on the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes a laminated iron core, and a plurality of protruding magnetic poles 2 are provided on the inner periphery of the core. Reference numeral 3 denotes an induction coil wound around the magnetic pole 2, which consists of flat oval-shaped unit coils 4a, 4b, 4c, 4 as shown in FIG.
d, and bent tubes 5a, 5b, and 5c, which are straight rectangular tubes inserted between these unit coils. 5a-4
They are stacked in the order of b-5b-4c-5c-4d. 6 is a spacer installed between the induction coils 3, which presses and holds the side surfaces of the induction coils. A wedge 7 is installed between each magnetic pole and presses and holds the inner circumferential surface of the induction coil 3, and the induction coil 3 is held in the inner circumferential direction and radial direction by these wedges and spacers. Reference numeral 8 is a support stand provided at both ends of the iron core, which also serves as a clamper for pressing the iron core; 9 is a cover provided to cover the coil end portion of the induction coil 3; one end of the cover is fixed to the support stand 8; , these support stand 8, cover 9
A sealed water supply side water chamber 1 that covers the coil end.
0, and a drainage side water chamber 11 are formed. 12
13 is a water supply port, and 13 is a drain port. Note that the arrows indicate the flow of cooling water.

As described above, in this invention, the electromagnetic coil 3 is wound around each of the six magnetic poles. This electromagnetic coil is divided into a plurality of parts in the radial direction, and bent tubes 5a to 5c made of a non-magnetic material (for example, stainless steel), which are straight rectangular pipes, are inserted between each of the divided unit coils. The induction coil 3 is constructed by stacking unit coils and vent tubes alternately. Each unit coil itself is made of a water-resistant insulating material and hardened by vacuum impregnation, making it mechanically and electrically strong. A spacer 6 having the same shape as the gap between adjacent induction coils 3 is provided.
The spacer 6 functions to regulate the cooling water so that it flows sufficiently through the vent tubes 5a to 5c, and to suppress vibrations of the induction coil 3 in the inner circumferential direction. In addition, the wedge 7 attached between the adjacent magnetic poles 2 is connected to the spacer 6.
Similarly, it functions to regulate cooling water and suppress vibrations in the radial direction.

The heat generated in the induction coil 3 is transferred to the vent tubes 5a to 5a in contact with the unit coils 4a to 4d.
Although it is removed by the cooling water flowing inside the insulating material 5c, the vibration of the induction coil 3 is suppressed by the spacer 6 and the wedge 7, so that reliability can be obtained without increasing the thickness of the insulating material, and furthermore, the cooling effect is not reduced. Further, by inserting the vent tubes 5a to 5c and pressing them with the wedges 7, excessive adhesion of the insulating material, which reduces the cooling effect, can be avoided. A space surrounded by a support stand 8 that also serves as a clamper for supporting the iron core 1, magnetic pole 2, induction coil 3, etc. and a cover 9 for protecting the induction coil 3 is defined as a water supply side water chamber 10 and a drainage side water chamber. 11, the cooling water that entered from the water supply port 12 enters the water chamber 10 and is filled with water, and the cooling water regulated by the spacer 6 and the wedge 7 passes through the vent tubes 5a to 5c and enters the water chamber 11. The water is drained from the inlet and drain chamber 13.

In this example, each unit coil of the induction coil is hardened by direct air impregnation, but after taping each unit coil, it is assembled into the iron core together with the vent tube, and the whole is hardened by integral vacuum impregnation. You may also do so.

As described above, according to the present invention, an induction coil mixed with a vent tube is wound around a plurality of magnetic poles provided on the inner periphery of an iron core, and the induction coil is pressed and held in both the circumferential direction and the radial direction. In addition to installing spacers and wedges, each unit coil of the induction coil is cured and fixed by vacuum impregnation, and a water chamber is formed with a support base and cover, making it mechanically strong and having high insulation reliability. Moreover, an electromagnetic stirring device having a simple structure and improved cooling performance can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an electromagnetic stirring device according to an embodiment of the present invention, Fig. 2 is a front view showing the external appearance of its main parts, and Fig. 3 is a partially cutaway view of the electromagnetic stirring device of Fig. 1. The plan view and FIG. 4 are perspective views of the induction coil shown in FIG. 1. 1...Iron core, 2...Magnetic pole, 3...Induction coil, 4a~
4d...Unit coil, 5a-5c...Bent tube, 6...Spacer, 7...Wedge, 8...Support stand, 9...Cover, 10...Water supply side water chamber, 11...Drainage side water chamber, 1
2...Water supply port, 13...Drain port. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A plurality of protruding magnetic poles are provided on the inner periphery, and bent tubes consisting of oval unit coils and straight rectangular tubes are wound around each of these magnetic poles so as to be stacked alternately. An iron core having an induction coil configured, a support stand that also serves as a clamper provided at both ends of the iron core, and a support stand provided at both ends of the iron core so as to cover the coil ends of the induction coil, one end of which is connected to the support stand. A cover configured to form a sealed water supply side water chamber and a closed water discharge side water chamber on both ends of the iron core by fixing the cover is attached between each of the induction coils. An electromagnetic stirring device for continuous casting equipment, comprising a spacer that presses and holds a side surface, and a wedge that is installed between each of the magnetic poles and presses and holds the inner peripheral surface of the induction coil. 2 A water supply port is provided in the water supply side water chamber, and a drain port is provided in the drain side water chamber, and the cooling water that enters from one water chamber passes through the vent tube inserted between each unit coil, and then flows to the other side. An electromagnetic stirring device in continuous casting equipment according to claim 1, wherein the electromagnetic stirring device is configured to drain water from a water chamber. 3. An electromagnetic stirring device for continuous casting equipment according to claim 1 or 2, wherein six protruding magnetic poles are formed on the iron core, and an induction coil is also wound around each magnetic pole. 4. The electromagnetic stirring device in continuous casting equipment according to any one of claims 1 to 3, wherein each oval-shaped unit coil constituting the induction coil is itself hardened by vacuum impregnation with an insulating resin. .