DE3211462C1

DE3211462C1 - Inductor for channel-type induction furnace

Info

Publication number: DE3211462C1
Application number: DE19823211462
Authority: DE
Inventors: Reinhold Ing Grad Eiselt
Original assignee: Mannesmann AG
Current assignee: BBC Brown Boveri AG Germany
Priority date: 1982-03-27
Filing date: 1982-03-27
Publication date: 1983-10-06

Abstract

An inductor is proposed, with an associated transformer, the core of which and the coils surrounding this core at distances and arranged coaxially inside one another are surrounded by the inner wall of the inductor, which is designed as a cooling jacket. The gaps between the core, the coils and the cooling jacket can be flowed through by cooling air supllied from outside via a hood. In order, in the case of adequate cooling effect, to reduce the power requirement of the blower motor, the cooling jacket of the inductor tapers gradually in the inflow region. At the same time, the blade-like guide plates on the cooling-jacket surfaces lying in the inflow region, which plates lie essentially transversely to these surfaces and in planes running parallel to one another, are arranged in a fixed manner. The edges, at which the guide plates are welded to the cooling-jacket surface, in each case enclose with a fall line of the cooling-jacket surface an acute angle open towards the direction of flow of the cooling air. <IMAGE>

Description

Mit 1 ist das Induktorgehäuse bezeichnet, das einen aus einer Trockenmasse bestehenden Körper 2 umfaßt Mittig in dem Körper 2 ist eine Rinne 4 vorgesehen, die über Kanäle mit dem nicht dargestellten Ofenraum in Verbindung steht. Dem Induktorkörper 2 ist ein Transformator 3 angeordnet, der mit dem Induktorgehäuse fest verbunden ist. Der Kern 5 des Transformators ist von Spulen 61 und 62 umgeben, die mit gegenseitigen Abständen koaxial angeordnet sind. 1 with the inductor housing is referred to, the one made of a dry matter existing body 2 comprises a groove 4 in the center of the body 2, which is connected to the furnace chamber, not shown, via channels. The inductor body 2, a transformer 3 is arranged, which is firmly connected to the inductor housing is. The core 5 of the transformer is surrounded by coils 61 and 62 with mutual Distances are arranged coaxially.

Zwischen der äußersten Spule 61 und der Induktor-lnnenwand, die als Kühlmantel 17 ausgebildet ist, ist ein Spalt vorgesehen. Ebenso ist die den Kern 5 des Transformators 3 umgebende Spule 62 von diesem letzten mit einem Abstand angeordnet Die Spalte zwischen den einzelnen Spulen sowie zwischen den Spulen und dem Kühlmantel 17 bzw. dem Kern 5 sind von von außen zugeführter Kühlluft durchströmbar.Between the outermost coil 61 and the inner inductor wall, which is called Cooling jacket 17 is formed, a gap is provided. Likewise, that's the core 5 of the transformer 3 surrounding coil 62 is arranged at a distance from the latter The gap between the individual coils and between the coils and the cooling jacket 17 or the core 5 can be flowed through by cooling air supplied from the outside.

Über dem Transformator 3 ist eine Haube 8 mit einer Kühlluftleitung 9 angeordnet, die den oberen Bereich des Transformators 3 allseitig umgibt und diesem gegenüber abgedichtet ist. In der Kühlluftleitung ist ein Gebläse 10 zum Kühlen des Kühlmantels 17, der Spulen 61, 62 sowie des Kerns 5 angeordnet. Die Kühlleitung 9 ist mit der Haube 8 des Induktorgehäuses 1 fest verbunden. Die Haube 8 ist ihrerseits mit dem Deckel 11 des Induktorgehäuses 1 fest verbunden. A hood 8 with a cooling air line is located above the transformer 3 9 arranged, which surrounds the upper region of the transformer 3 on all sides and this opposite is sealed. In the cooling air line is a fan 10 for cooling of the cooling jacket 17, the coils 61, 62 and the core 5 are arranged. The cooling pipe 9 is firmly connected to the hood 8 of the inductor housing 1. The hood 8 is in turn firmly connected to the cover 11 of the inductor housing 1.

Damit sind das Induktorgehäuse 1, der Transformator 3 sowie die Haube 8 mit der Kühlluftleitung 9 samt Gebläse 10 zu einer Gruppe zusammengefügt, die über Flansche 12 an dem Ofen befestigt ist. Aus F i g. 1 ist ferner ersichtlich, wie sich der Kühlmantel 17 im Einströmbereich 71 der Kühlluft in Strömungsrichtung Eallmählich verjüngt. This is the inductor housing 1, the transformer 3 and the hood 8 combined with the cooling air line 9 together with the fan 10 to form a group which is attached to the furnace via flanges 12. From Fig. 1 can also be seen, how the cooling jacket 17 moves in the inflow area 71 of the cooling air in the flow direction Gradually rejuvenated.

An den im Einströmbereich 71 liegenden Kühlmantelflächen 171 sind schaufelartige Leitbleche durchgehend angeschweißt. Diese Leitbleche 13 verlaufen im wesentlichen quer zu der Kühlmantelfläche 171 und liegen in parallel zueinander verlaufenden Ebenen. Die Kanten 131, an welchen die Leitbleche 13 mit der Kühlmantelfläche 171 verschweißt sind, schließen jeweils mit einer Fall-Linie fder Kühlmantelfläche 171 einen spitzen, entgegen der Strömungsrichtung E der Kühlluft offenen Winkel y. On the cooling jacket surfaces 171 located in the inflow area 71 Shovel-like guide plates welded on throughout. These baffles 13 run substantially transversely to the cooling jacket surface 171 and are parallel to one another trending levels. The edges 131, on which the guide plates 13 with the cooling jacket surface 171 are welded, each close with a falling line for the cooling jacket surface 171 forms an acute angle that is open against the direction of flow E of the cooling air y.

Wie insbesondere aus F i g. 2 ersichtlich ist, liegen die Leitbleche 13 senkrecht zu der Kühlmantelfläche 171. As in particular from FIG. 2 can be seen, are the baffles 13 perpendicular to the cooling jacket surface 171.

Die Leitbleche 13 sind derart angeordnet, daß sie - in Draufsicht gesehen - den Umriß des Kühlmantels 17 nach innen nur geringfügig überragen (vgl. F i g. 3).The baffles 13 are arranged such that they - in plan view seen - the outline of the cooling jacket 17 inwardly protrude only slightly (cf. F i g. 3).

Dabei, wiederum in Draufsicht gesehen, überdecken sich die Leitbleche 13 gegenseitig derart, daß ihre dem Spalt zwischen dem Kühlmantel 17 und der äußersten Spule 61 zugewandten Kanten 132 Linien bilden, die im wesentlichen zu der Umrißlinie des Kühlmantels 17 parallel verlaufen, wie ebenfalls die Fig.3 zeigt. Aus dieser Figur ist ebenfalls ersichtlich, daß die Leitbleche 13 eine Dreieckform besitzen.Here, again seen in plan view, the baffles overlap 13 mutually such that their the gap between the cooling jacket 17 and the outermost Coil 61 facing edges 132 form lines which are substantially to the contour line of the cooling jacket 17 run parallel, as also shown in FIG. From this Figure can also be seen that the baffles 13 have a triangular shape.

Der Austrittsbereich 72 des Kühlmantels 17 ist in Richtung der Strömung allmählich erweitert (F i g. 1). The exit area 72 of the cooling jacket 17 is in the direction of the flow gradually expanded (Fig. 1).

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Claims

Claims: 1. Inductor for an induction channel furnace, in particular for melting non-ferrous metals with a transformer, the core of which is mutual Spaces coaxially nested coils is surrounded, the outermost Coil surrounded by the inductor inner wall forming a cooling jacket at a distance is and the gap between the core and the innermost coil as well as between the individual coils and between the outermost coil and the cooling jacket from the outside supplied cooling air can be flown through, d a d u r c h characterized that the cooling jacket (17) in the inflow area (71) of the cooling air gradually in the flow direction (E) tapered and that on the cooling jacket surfaces (171) located in the inflow area (71) essentially transversely to the latter and in parallel to each other Shovel-like guide plates (13) lying flat against one another are fixedly arranged, wherein the edges (131) with which the guide plates (13) with the cooling jacket surface (171) are welded, each with a drop line (f) of the cooling jacket surface (171) an acute angle (z) open against the direction of flow (E) of the cooling air conclude.

2. Inductor according to claim 1, characterized in that the guide plates (13) are perpendicular to the cooling jacket surface (171).

3. Inductor according to Claims 1 and 2, characterized in that that the baffles (13) - seen in plan view of the inductor - the outline of the cooling jacket (17) do not protrude inwards or only slightly.

4. Inductor according to claims 1 to 3, characterized in that that the baffles (13) - seen in plan view of the inductor - are mutually such partially cover that their the gap between the cooling jacket (17) and the outermost Coil (61) facing edges (132) form lines which are essentially with cover the outline of the cooling jacket (17) or run parallel to it,

5. Inductor according to claims 1 to 4, characterized in that the guide plates (13) the Have the shape of a triangle.

6. inductor according to claims 1 to 5, characterized in that that the outlet area (72) of the cooling jacket (17) extends in the direction of flow (E) gradually expanded.

The invention relates to an inductor for an induction channel furnace, especially for melting non-ferrous metals, with a transformer, its core is surrounded by coaxially arranged coaxially one inside the other at mutual distances, wherein the outermost coil from the inductor inner wall forming a cooling jacket with Space is surrounded and the gap between the core and the innermost coil as well between the individual coils and between the outermost coil and the cooling jacket can be flowed through by cooling air supplied from the outside.

For cooling inductors or transformers for induction channel furnaces is preferred - if the temperature conditions allow - for safety reasons Air used. The cool air is supplied to the parts to be cooled via fans, with a view to the relatively large volume flow required Power requirement is quite high. For example, it is used to cool inductors for an induction furnace with an output of over 700 kW, a fan with a 30 kW motor required. This increases both the investment outlay and also the energy costs for the ancillary units of the furnace.

In the inductors known up to now, the cooling jacket of the inductor which surrounds the coils, to the inductor axis running parallel, flat walls.

The cool air emerges from the air supply line into the inflow area of the transformer on all sides surrounding the hood and from there into the circular Gap between the coils or the core and the cooling jacket. The way of the cooling flow along the cooling jacket in the axial direction, however, is too short. To be effective As already mentioned, a large volume flow must be available to ensure cooling be.

The present invention is based on the object in a Inductor of the type mentioned a more intensive cooling of the inductor as well the transformer coils with much less effort than up to now reach; in particular, the power requirement of the fan motor should be reduced will. This object is achieved according to the invention by the features of the characterizing part Part of claim 1 solved.

Due to the funnel-shaped design of the cooling jacket in the inflow area of the cooling jacket, more favorable flow conditions are produced in the operating state. The air flow is given a twist by the baffles, so that the cooling flow jets extend essentially helically when flowing through the gaps. Through this the path of a cooling stream jet is significantly lengthened. The power requirement of the fan motor is thereby considerably reduced and thus the investment outlay as well as reduced energy costs.

Advantageous further developments of the invention are set out in the subclaims contain.

The embodiment shown schematically in the drawings the invention is described in more detail below to explain the invention. In the drawings, F i g. 1 shows an inductor according to the invention for an induction channel furnace in axial section, F i g. 2 shows an axially sectioned cooling jacket of the inductor in FIG the view and F i g. 3 is a plan view of FIG. 2.

The inductor shown as an example is for melting non-ferrous metals, especially aluminum and brass. It has an output of 375 kW. Of the Induction furnace has two inductors with two transformers each.