SU1251246A1 - Stator of electromagnetic agitator - Google Patents

Description

The invention relates to devices for electromagnetic stirring of metal in arc-arc steel-smelting furnaces, as well as in other containers.

Known stators are electromagnetic intermixers, having the form of a double or trough-shaped inductor located under the bottom of the furnace.

However, the openness of the magnetic circuit in the known stators leads to the manifestation of a longitudinal edge effect, all the more significant since the stators, as a rule, are made bipolar. As a result, asymmetry of the phases takes place, the energy indices decrease, the consumption of winding copper increases. Cro

The cradles of the furnace, where the stator is located, are forced to reduce its active length and, therefore, the magnitude of pole division, since non-magnetic gaps in the mixing

- devices reach, 5 m, dl

in the case of small pole division, an increase in the intensity of the mixing should increase the linear current load on the stator surface, which also reduces the energy and economic indicators,

In steel-smelting furnaces there is a softer bottom and a metal breakthrough. The bottom is washed out under the lower part of the bath, which is the zone of the most intensive mixing.

In this case, the liquid metal gets on the stator and not only destroys it but, having reflected from its surface, splashes to the sides and burns through the metal structures of the furnace and the workshop.

The closest to the present invention is an induction rotator, which is a stator of an asynchronous electric machine, containing a magnetic core with a multiphase winding located on it, mounted vertically. A cylindrical container, such as a ladle with liquid metal, is placed in the bore of the stator. The rotating magnetic field of the stagor interacts with the metal and makes it rotate.

However, the specified rotator can

be used only for cylindricality, in which the field rotates with or at a speed of V, of their capacities allowing setting 2 ft (f is the frequency of feeding the inductor along or around the grid). Electromagne-1st cylinder.nitna force spins metal movement

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The purpose of the invention is to improve the energy performance and ensure the free flow of metal during its emergency breakthrough through the bottom of the furnace.

This goal is achieved by the fact that the stator of an electromagnetic metal stirrer, containing a magnetic core with a multiphase winding located on it, is made in the form of an annular inductor, the active surface of which is facing the bottom of the furnace under which it is located.

To get as close as possible to the bottom of the furnace, the active stator surface can be made in the form of a reflected truncated cone.

To provide both mixing and slag loading modes, the stator can be provided with separate winding groups on each of the semicircles connected in opposite directions. FIG. I shows the installation diagram of the stator under the furnace; in fig. 2 - the same in terms of; in fig. 3 is a diagram of the movement of the metal in the bath and in the stirring mode; in fig. 4 is a diagram of the stator with a maximum approximation to the bottom of the furnace; in FIG. 5 is a diagram of the movement of metal in a bath in slag download mode; in fig. 6 is a circuit for closing the magnetic flux above the active surface of the stator.

The proposed stator I, made in the form of an annular inductor, consists of an annular closed magnetic circuit 2 with a free opening in the central part 3 {FIG. one). On the active surface 4 magnetopros

five

Water 2 with a step equal to the pole division t, are located sections 5 of the bipolar winding (Fig. 2).

The stator 1 is located under the bottom of the furnace 6, its active surface 4 is parallel to the metal mirror 7. In the bath 8 there is a liquid metal.

The device works as follows.

When the winding is powered by an alternating current, an electromagnetic field is created, which closes through the bath 8 with the liquid metal. The interaction of the field with currents induced in the metal generates an electromagnetic force F directed tangentially to the circumferential speeds Y, and the mixing intensity increases due to the radial components of the speed Ud due to the difference in the linear velocities of the metal .

For a better approximation to the spherical bottom of the furnace, the active surface of the stator can be made in the form of a reflected truncated cone (Fig. 4).

The stator can have both consonant and counter winding switching on the semicircle (Fig. 5) and, accordingly, consonant and counter movement of the floor. In the first case only mixing of the metal takes place;

The closure of the magnetic flux I above the surface of the stator is similar to the distribution of the magnetic field on the plane by a linear inductor (Fig. 6).

Running the stator of an electromagnetic reamer in the form of an annular inductor provides a free metal drain during an emergency breakthrough of the furnace, which makes it possible to save not only the stator, but also the nearby equipment and furnace design, and leads to cost savings necessary to eliminate the accident.

ten

The closure of the stator magnetic circuit eliminates the longitudinal edge effect, which improves the energy efficiency of the device, reducing the power consumption 15 by 28–30%.

Increasing pole division also improves energy

stator performance.

20 A significant advantage of the proposed device is the removal of the intensive mixing area from the danger zone in the lower part of the furnace bath, where the bottom warp is most likely.

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Compiled by L. Magayumova Editor I. Segl nick Tehred A. 1khravchuk Proofreader G. Reshetnik

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Order 4422/54 Circulation 631. Subscription VNIIPI USSR State Committee

on deposits of inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

And A.

Proizvodstnenni-Guigraphic Enterprise, Uzhgorod, st. Project, 4

Claims (4)

1. STATOR OF ELECTRIC MIXING MIXER of metal, containing a magnetic circuit with a multiphase winding located on it, characterized in that, in order to improve energy performance and ensure free flow of metal during its emergency breakthrough through the bottom of the furnace, the stator is made in the form of a ring inductor, the active surface of which is facing to the bottom of the stove under which it is located. 2. Stator pop. ^ characterized in that, in order to maximally approximate the stator to the spherical bottom of the furnace, the active surface of the stator is made in the form of a reflected truncated cone. 3. The stator according to paragraphs. 1 and 2, characterized in that, in order to ensure the download of slag from the surface of the metal mirror, the stator is equipped with separate groups of windings on each of the semicircles, included in the opposite direction. figure 1 1251246 A1 125.1246 The purpose of the invention is the improvement of energy performance and ensuring the free flow of metal during its emergency breakthrough through the bottom of the furnace. 5, This goal is achieved by the fact that the stator of an electromagnetic metal reamer containing a magnetic circuit with a multiphase winding located on it is made in the form of a ring inductor, the active surface of which is facing the bottom of the furnace under which it is located. For maximum approximation to the furnace bottom, the active surface of the stator can be made in the form of a reflected truncated cone. To ensure both mixing and slag loading modes, the stator can be equipped with separate 20 groups of windings on each of the semicircles, included in the opposite direction. In FIG. 1 shows a diagram of the installation of the stator under the furnace; in FIG. 2 the same in plan; in FIG. 3 is a diagram 25 of the movement of metal in the bath and in the mixing mode; in FIG. 4 is a diagram of a stator with a maximum approximation to the bottom of the furnace, 'in FIG. 5 is a diagram of the movement of metal in a bath in a slag downloading mode; in FIG. 6 is a diagram of magnetic flux closure above the active surface of the stator. The proposed stator 1, made in the form of an annular inductor, consists of an annular closed magnetic circuit 2 with a free opening in the central part 3 (Fig. 1). On the active surface 4 of the magnetic circuit 2 with a step equal to the pole separation ι, sections 5 of the bipolar winding are located (Fig. 2). The stator 1 is located under the bottom of the furnace 6, its active surface 4 is parallel to the mirror of the metal 7. In the 45 bath 8 is a liquid metal. The device operates as follows. When the winding is supplied with alternating current, an electromagnetic one is created at ⁵⁰ le, which closes through a bath 8 with liquid metal. The interaction of the field with the currents inducted in the metal creates an electromagnetic force F, directed tangentially to the circle, along which the field rotates at a speed V _and equal to 2 ft (f is the frequency of the supply network). Electromagnetic force causes the movement of metal