SU1236620A2 - Submersible induction heater for melted metal - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase the intensity of the melt mixing. The invention is an improvement of the technical solution for auth. St. No. 1085023. Immersion heater contains two inductors. made in the form of closed magnetic conductors 1.2 with windings 3, 4 connected in phase. Inductors are placed in the casing 6 with a through channel 7 and a hole 8 connected to channel 7 and located symmetrically between the inductors. At the ends of the casing 6, parallel slotted cavities 9 and 10 are provided. The central cavity 9 intersects the channel 7, and the lateral cavities 10 are filled with ferromagnetic material. The presence of the central cavity 9 provides an increase in the electric current density and an increase in the intrinsic magnetic field at the exit of the channel 7. Ferromagnetic masses filling the cavities 10 contribute to the enhancement of the electro-vortex flow and form a jet sucking the melt from the channels. 2 Il. ё Ю ОО О)

Description

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The invention relates to heaters for metal melts and can be used for machining metals and alloys in foundry, engineering, and the like. production, and is an improvement of the known device auth. St. No. 1085023.

The purpose of the invention is to increase the intensity of the melt mixing.

1 shows a heater, a general view in section; FIG. 2 is a view of A; FIG. (the dotted line shows the magnetic field intensity lines in a plane intersecting the slot cavities)

Submersible induction heater-I tel contains closed magnetic conductors 1 and 2 with windings 3 and 4 interconnected in-phase and connected to the AC source 5. Magnetic cores 1 and 2 with clutch 3 and 4 are placed in a casing made of heat-resistant material

6 with a through channel 7-axis. There is a through hole 8 connected to the through channel

7 and symmetrically located between the magnetic cores 1 and 2. At the ends of the casing 6, parallel gaps 9 and 10 are made. The cavity 9 intersects the through channel 7 with a central slit, and the side slit strips 10 are filled with a ferromagnetic material. from the melt.

The device works as follows.

After the heater is placed in the melt bath with a reduced temperature, the windings 3 and 4 are connected to the AC source 5 and the heating of the melt is started, the alternating currents are in the magnetic conductors and 2 are excited. The phase angle of these magnetic fluxes is zero.

As a result, the currents induced in the suction through hole 8 have opposite directions and cancel each other out. Electromagnetic forces in the through hole 8 are zero.

2 as a result of the presence at the outputs of the through channel 7 of electromagnetic forces from the interaction of the induced gok with its own magnetic field, metal 36620S is sucked

melt through hole 8 and its output in both directions of the through channel 7. The electric current passes through the through channel

5 7 and closes in the bath. At both outputs of channel 7, the current density towards the bath decreases and, therefore, 5 electromagnetic forces are also directed from both outputs of channel 7

 About in the direction of the bath.

The flow rate of the molten metal is determined by the magnitude of the electromagnetic forces at the outlets of the through channel 7 (the electromagnetic force in the hole 8 is zero)

The electromagnetic force forms jets that propagate from the outlets of the through channel 7 into the bath and stir the melt.

20 The presence of central slot cavities 9 provides an increase in the density of electric current and, as a consequence, an increase in the intrinsic magnetic field at the exit of channel 7,

2 The ferromagnetic masses filling the side slot cavities 10 deform their own magnetic field and the field strength lines are no longer directed along the circumference, but along a rectangular contour (Fig. 2). There is an increase in the normal relative to the electric current lines to the component of the intensity of the own magnetic field. As a result

35, the electromagnetic force at the extrusions from channel 7 increases, and the electric vortex flow, which takes place in the mouth of the through channel and forms a jet sucking

40 melt from kana; aov. Melt transit flow is enhanced.

Thus, in the inventive device, by increasing the electro-magnetic forces at the outlets from the heater channel, the speed of the jet flow from the outlets from the channel and the distance of propagation of this flow into the bath increase. As a result

50 the process of melt mixing is significantly intensified. As shown by estimates based on experimental data obtained on mercury, the flow rate in a bath with

55 with molten aluminum at a distance of 0.2 m from the heater with an induced current strength of 4 kA increases from 0.64 to O ,, 9 m / s, and the intensity of mixing increases as compared to

with a known device by 45%. I

Claims (1)

Invention Formula Induction submersible heater for metal melt according to ed. St. No. 1085023, characterized in that, in order to increase The melt mixing intensity, in the heater casing on each side of the through channel, three through parallel parallel one another slit-like slots, the middle of which intersects the through channel and perpendicular to it, and the other two are filled with ferromagnetic material. / 1f I Yu I 1 I n N Compiled by B.Fochenkov EditedA.Vorovich Tekhred L.Serdyukova Proofreader I.Musk Order 3099/59 Circulation 765 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. A / 5 -Production and printing company, Uzhgorod, st. Design, 4. fig.g