SU1188913A1 - Induction hot-air oven - Google Patents

Abstract

An induction channel furnace containing a bath for molten metal, an induction unit made in the lining of a lining with a closed channel with an opening connecting it to the bath and a dielectric partition made on the inner wall of the channel, and an indicator that , in order to intensify heat and mass transfer between the liquid metal in the bath and in the induction unit, at least one additional channel, identical to the specified one, is made in the induction unit, diametrically protruded in each channel vopolozhno said additional apertures are made apertures, interconnected, hydraulic, Kim tract, and the dielectric partition wall is formed in at least one of the channels along the symmetry axis of one of the holes.

Description

. 2. Furnace in accordance with Claim 1, in accordance with the fact that, when performing more than one additional channel, dielectric partitions in adjacent channels are located in opposite openings.

3. Furnace according to claims 1 and 2, characterized in that, when the induction unit is located under the bathtub and the channels in parallel planes, the inductor covers both channels.

4.Pech on PP. 1 and 2, that is, with the location of the induction unit under the bath, and the channels in the same plane, k. 1 / th channel is covered by the inductor.

5.Pech on PP. 1,2.and 4, characterized in that, in order to reduce the hydraulic resistance, the hydraulic path is made in the form of an arc-shaped channel directly adjoining to the channels of a closed form, and the axis of symmetry of the holes are located along the extension of the axis of the hydraulic path.

6.Pech on PP. 1 and 2, of which is auschaya. so that when an induction unit is executed, the holes in the channels buried in the bath are located on the same horizontal axis and each channel is covered by an inductor.

The invention relates to electrical engineering, in particular to induction channel furnaces. The purpose of the invention is to intensify the heat exchange between the liquid metal in the bath and in the induction unit. Fig. 1 shows an induction channel furnace with two channels in the same plane; figure 2 - the same, with the hydraulic path of the arcuate shape; Fig. 3 is a section through a single channel, an induction channel furnace with two channels in parallel planes; 4 is the same in the cross section of the furnace; in fig. 5 and 6 - channel furnace with three channels; 7. and the same, with the induction unit lost in the bath; in fig. 9 and 10 is the same with an induction unit embedded in the bath. The induction channel furnace contains a bath 1, a dual induction unit 2, in lining 3 of which channels 4–6 are made and are closed and hydraulic path 7. Channels 4–6 are equipped with openings 8–10 connecting them to the bath. The axis of symmetry of the holes on the inner surface of the channel is set dielectric partitions 11 - 13, which overlap the closed channels. Kana-: ly covered by inductors 14-16. The furnace works as follows. When inductors are connected in closed channels, closed secondary currents are induced that are not in contact with each other. The presence of partitions overlapping closed channels and adjacent to their inner walls causes the current to bend around these partitions. At the site of current bending from its interaction with its own magnetic field, electromagnetic forces arise, directed along an external normal to the current lines and having components in the bath direction and the lower channel, as a result of which, a stable intensive through-flow of metal from the bath through the holes along both halves of the channel into the lower channel and further into the bath occurs. At the same time, there are no areas throughout the metal path where, due to the inhomogeneity of the current density, electromagnetic forces occur, which prevent the through flow. A decrease in the hydraulic resistance in the case of an arcuate horizontal path and its smooth coupling with the channels leads to an increase in the through-flow rate (Fig. 2).

3

The location of the channels can be in the same plasticity (Fig. 1) or in parallel planes (Fig. 3 and 4, but already with one inductor covering both channels, which provides for intense heat and mass transfer between the metal in the kiln and the channels of the unit with different furnace dimensions) .

To increase the technical and economic parameters, the furnace can be made in the three-phase variant (Figures 5 and 6) with an inductor for each channel. It is performed in the same way as the single-phase variant.

For furnaces with an induction unit buried in the bath (Figs. 7 and 8), all the openings are located on the same straight line, and the inductors cover each channel and are connected with a phase shift of 180 al.grad.

889134

The furnace can also be made in the form of an integrated system of channels (Figs 9 and 10), where the role of the hydraulic path is performed by the bath part 5, and the heat and mass transfer occurs in the same way as in the detachable induction units described above.

Thus, in the proposed embodiments of an induction channel furnace, intense heat and mass transfer between the metal in the bath and the channels is provided, and the overheating along the entire path is significantly reduced. At the same time, all Joule heat is released directly in the channels, which leads to an increase in the specific power of the induction unit, an increase in the active resistance of the metal in the furnace channels, and an increase in the power factor of the furnace and its electrical efficiency.

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Claims (6)

1. INDUCTION CHANNEL FURNACE containing a bath for molten metal, an induction unit made in the form of a lining with a closed channel with a hole that connects it to the bath, and a dielectric partition made on the inner wall of the channel, and an indicator, characterized in that, in order to intensify heat and mass transfer between the liquid metal in the bath and in the induction unit, at least one additional channel is made in the induction unit that is identical to the specified one, diametrically opposite in each channel but these holes have additional holes connected to each other by a hydraulic path, and the dielectric partition is made in at least one of the channels along the axis of symmetry of one of the holes. "SU 1188913 2. The furnace according to claim 1, characterized in that when performing more than one additional channel, the dielectric partitions in adjacent channels are located in opposite holes. 3. The furnace according to paragraphs. 1 and 2, different. in that when the induction unit is located under the bathtub, and the channels are in parallel planes, the inductor covers both channels. 4. The furnace according to paragraphs. 1 and 2, characterized in that when the induction unit is located under the bathtub, and the channels are in the same plane, each channel is covered by an inductor. 5. The furnace according to paragraphs. 1,2. And 4, characterized in that, in order to reduce hydraulic resistance, the hydraulic path is made in the form of an arc-shaped channel directly conjugated with channels of a closed shape, and the symmetry axis of the holes are located on the continuation of the interface axis of the hydraulic path. 6. The furnace according to paragraphs. 1 and 2, entailing that, when the induction unit is executed, the channel openings buried in the bath are located on one horizontal axis and each channel is enclosed by an inductor.