RU2004898C1 - Induction channel melting-distributing furnace - Google Patents

Description

the closing part of the magnetic circuit, i.e. towards the beginning of the expansion of the melting channel with the transition to the transportation and metal pipelines, which allows saving energy when removing the melt from the furnace and solving the problem. If the expanded part of the melting channel is elongated, the wall portion of the metal wire is also elongated so that the expanded part of the melting channel is divided into two parts — the continuation of the melting channel and a branch from it transporting into the metal wire. Between the end of the metal wire or the end of the elongated part of the wall of the metal wire and the inner surface of the expanded channel there is a gap not exceeding the width of the poles surrounding the melting channel of the open magnetic circuit. The pressure acting on the melt is generated from the interaction of an electric current with a magnetic circuit. Therefore, the gap between the end of the metal wire and the inner surface of the beginning of the expansion of the melting channel cannot be greater than the width of the poles (thickness of the packet) of the magnetic circuit, otherwise there will be a low pressure zone next to the zone of increased pressure and a buoyant force will not act on the melt, i.e. no melt will be removed from the furnace.

Figure 1 shows a cross-sectional view of an induction channel play-distributing furnace; figure 2 is a top view of a furnace without a metal wire; in Fig. 3 is a transverse section through a furnace with a metal wire, part of the wall of which is made elongated; Fig. 4 is an enlarged mouth of the melting channel for mounting a metal wire of rectangular cross section with an elongated wall portion in it, top view; in Fig.5 is a section aa in Fig.Z; Fig. 6 is a section B-B in Fig. 7t which shows an induction channel melting-distributing furnace with a lateral connection of the induction unit; 7 is a top view of the furnace with a lateral connection of the induction unit.

The induction channel melting and distributing furnace consists of a bath 1 for molten metal, a melting channel 2 of an induction unit, the mouth of which is made with extension 3, an inductor consisting of a closed magnetic circuit 4 covering the melting channel 2, and a winding 5, an electromagnet containing open magnetic circuit 6 with a winding (s) fed with alternating current of the same frequency as the winding of an inductor, a metal wire 8 made of electrical insulation material, a recess 9 in the machine bath furnace for cleaning the drain 2 and recesses 10 in the bottom of the bath for installing metal wire 8. Metal pipe 8 can be made with an elongated part of the wall 11.

Induction channel melting and distribution furnace operates as follows.

0 A melt is poured into the bath 1, which fills the channel 2 of the induction unit and forms a short-circuited liquid metal coil around a closed magnetic circuit 4 of the inductor, in which the winding 5

5 is primary. The melting mode is carried out when the metal wire 8 is removed and when the inductor winding 5 is connected to an alternating current source. The molten material is charged at

0 this, in the liquid metal in channel 2 and in bath 1, an electric current flows, induced by the inductor as in the secondary winding, i.e. in a short-circuited liquid metal and a spiral loop. When the winding 7 of the open magnetic circuit b is switched off, the electric current in the liquid metal in the extension 3 of channel 2 interacts with the open magnetic circuit and forms a magnetic flux, which,

0 with an electric current in a liquid metal, forms a force directed towards the closing part of the magnetic circuit (PM), i.e. in the direction of the expanded part 3 of channel 2. The action of a force on a liquid metal sets it in motion. Since part of the metal moves on one side and part on the other side of channel 2, a vortex is created between the poles of the open magnetic circuit 8 in the initial part of the extension 3

0 the movement of the metal, and, most importantly, the circulation of the melt is formed along the melting channel 2, which ensures the heat and mass transfer process and accelerated melting of the metal. If necessary

5 to increase the intensity of metal motion along channel 2, connect the electromagnet winding 7 to an alternating current source of the same frequency as the inductor winding 5; moreover, the magnetic flux generated by winding 7 should coincide in direction with the magnetic flux formed in the open magnetic conductor b from interacting with electric current in liquid metal and

5 reinforce it. Thus, in the melting mode, the mixing of the metal can be carried out without energy consumption by the windings of the electromagnet, which increases the efficiency of the furnace due to the location of the magnetic circuit 6. To achieve the same

performance as the prototype, i.e. the melting rate of the charge being loaded, less energy is required by the electromagnet windings, since In the proposed furnace, the forces generated by the interaction of an electric current in a liquid metal with an open magnetic circuit are used, which is not in the prototype. Connecting the winding 7 to a power source of the same frequency as the inductor power allows you to control the intensity of heat and mass transfer processes by changing the voltage on the winding 7,

The mode of transporting the melt from the furnace is as follows. Pre-disconnect the oven from the power source. An electrically insulating metal pipe 8 is installed in the bath 1 with liquid metal prepared for transportation, so that the end part of the megalowire 8 fits into the docking recess 10 at the mouth of the extension 3 of channel 2. Connect the inductor winding 5 to an alternating current source. In this case, an electric current is induced in channel 2, which, interacting with an open magnetic circuit b, generates a force directed towards the expansion 3 of the mouth of channel 2. When a metal wire 8 is installed, electric current will flow only through channel 2 and exit to the furnace bath. Therefore, the current density in the gap of the open magnetic circuit b will increase and, accordingly, the force acting on the melt will increase. One side of the metal wire forms a continuation of channel 2, and the end part of the metal; the metal wire 8 forms a branch in extension 3 from the melting channel 2, which then passes into the metal channel. Therefore, the force generated by the interaction of an electric current in a liquid metal with an open magnetic circuit, in the gap of which this metal is located with a current, causes the metal to move into the extension 3 and further into the channel of the metal wire 8. To increase the speed of transportation of the liquid metal, the windings (winding) 7 of the electromagnet connected to a power source so that the magnetic flux generated by this winding is added to the magnetic flux induced in an open magnetic circuit with an electric current in a liquid metal e in channel 2. In addition, a voltage can be applied to the windings 7, which will create a magnetic flux in an open magnet wire of the opposite direction to the magnetic flux induced by the current in the liquid metal, thereby stopping the casting of liquid metal,.

carry out a dose casting without removing metal flow 8. Figure 1 shows an open magnet pipe 6 made curved to accommodate a winding 7. However, in the case of inducing a current in channel 2, sufficient in magnitude to generate a force that expels the liquid metal when this current interacts with an open magnetic circuit 6, the magnetic wire b can be made flat and without windings, and is located close to the bottom of the bath. Compared with the prototype of the proposed furnace uses less energy, since it is used

5 forces formed by the interaction of an electric current in a liquid metal with an open magnetic circuit, which solves the problem and increases the efficiency of the furnace.

0 Fig. 3 shows an embodiment of a furnace with a metal wire 8 having a rectangular cross section. A part of the wall of the electrical insulating metal wire 8 is made elongated 11, which, when the metal pipe 8 is inserted into the recess 10 shown in Fig. A, forms in the expanded part of the channel 2 a branch of the transport channel into the extension 3 from the melting and the continuation of the melting

0 channel 2 on the other side of the wall 11. The operation of the furnace depicted in Fig.Z, similar to the operation of the furnace depicted in Fig.1.

On figb and 7 shows a furnace with a lateral arrangement of the induction unit.

5 In this case, the insulating metal wire 8 is made L-shaped. The operation of the furnace is similar to that described above (Fig. 1). The extension 3 at the mouth of the melting channel 2 can be performed as in the plane

0 cross-sections of the channels of the induction unit, and in other planes at an angle or perpendicular to the plane of the channels of the induction unit. The extension 3 of the mouth of the melting channel 2 can be performed both towards the inner part of the channels of the induction unit and towards the outer part, if only the closing part of the open magnetic circuit is located on the side of the beginning of the expansion of the melting channel and the end of the metal wire or the end of the elongated part of the wall .

Induction channel melting and distributing furnace has a number of advantages

5 in front of a known one selected as a prototype, comprising the following:

1. The furnace uses forces acting on the liquid metal and generated by the interaction of an electric current in the liquid metal with an open magnesium wire without the consumption of electricity by the windings. In the case of power consumption by these windings, an increase in the force acting on the melt and an increase in productivity occur.

2. The furnace has a simpler design, a removable metal wire, which compares favorably with the known one, in which a special structure with a metal wire made as a unit with the expansion of the melting channel and located at an angle to the melting channel is required for metal spill. The metal wire in the known furnace cannot be removable, since the melting channel is always located

5

below the metal mirror in the bathtub of the furnace. In addition, when using the known technical solution as a melting furnace, another design without a metal wire is required, which limits the functionality of the known furnace.

3. The furnace is easy to operate due to a removable metal wire, has good access for cleaning channels, and allows the use of the same design as a melting and distributing furnace. (56) Copyright certificate of the USSR No. 1072574, cl. F 27 D 11/06, 1985.

USSR copyright certificate No. 1364845, cl. F 27 D 11/06, 1988,

Claims (1)

SUMMARY OF THE INVENTION 1. INDUCTION CHANNEL Smelter, containing a melt bath, an induction unit, the mouth of the channels of which are connected to the lower part of the bath and at least one of the mouths of the melting channel is made with an expansion, an electromagnet with an open magnetic circuit. installed in the channel expansion, and a metal wire, characterized in that the metal wire is made removable from electrical insulation material and installation Fg / g / the mouth of the melting channel is renewed in the expanded part, and there is a gap between the end of the metal wire and the inner surface of the expanded channel not exceeding the width of the poles enclosing the melting channel of the open magnetic circuit, which closes The part of which is located on the side of the beginning of the expansion of the channel. 2, A furnace according to claim 1, characterized in that a portion of the wall of the metal wire is elongated. thirty / /about FIG. 2 IG 4 &   ЈzЈ  ff7 / O 3 2 FIG. 4 FIG. 5 FIG. 6 FIG. 7 Bb AND / 7 / YS. s / sss / b 3 5 2 7 2