DE1015159B - Inductor for heating curved surfaces, in particular the inner walls of bores or the like. - Google Patents

Description

GERMAN

The invention relates to an inductor for heating curved surfaces, in particular the inner walls of bores in metallic workpieces, consisting of at least a single-turn coil through which cooling water flows and a protective body surrounding it.

For heating metallic objects, in particular steel parts, by electro-inductive means it is known to use single or multi-turn inductors or coils. To protect the coil and to avoid body closure, it has also been proposed when hardening curved Surfaces or the inner wall of the bores the coil in a protective body, which at the same time can serve as a spacer to arrange. On the other hand, it is also known to use inductors with iron cores to be provided for better magnetic return. The coil turns are known in these Arrangements are often provided with a cooling channel, which is preferably arranged coaxially.

The invention has the object of increasing the load capacity by improving the heat dissipation of the inductor when heating curved surfaces.

This is achieved according to the invention in that the cooling water channel at the end of the coil in one preferably deeper than this located point of the protective body interior opens and that means for Discharge of the cooling liquid are arranged above the coil. It becomes a more intensive cooling of the inductor, as the coolant flows around it both inside and outside.

The design of the inductor according to the invention is particularly advantageous when in on in the coil As is known, an iron core is provided to improve the magnetic return path. This is then provided with one or more holes through which the rising coolant passes, so that the heat is also dissipated well and safely from the iron core. So that will allows the use of a magnetically favorable form of the high-frequency iron core.

The inductor and high-frequency iron core are then constantly under water. At the same time, the Cooling of the massive coil return within the water depth is accomplished from the outside.

Further details of the inductor according to the invention are explained in more detail with reference to the drawing.

The figure shows an inductor 1 which is arranged in a protective body 2. The inductor 1 consists of a coolant-carrying coil 3 and an iron core 4 to improve the magnetic Conclusion in magnetically particularly favorable

of curved surfaces,

especially the inner walls

of holes or the like.

Applicant:

Siemens-Schuckertwerke

Corporation,

Berlin and Erlangen,

Erlangen, Werner-von-Siemens-Str. 50

Dipl.-Ing. Reinhold Müller, Nuremberg,
has been named as the inventor

stiger shape. The coil 3 is provided with power supply lines 5 and 6, which at the same time also supply the cooling water the coil. Here, in the inductor according to the invention, the return line 6 of the coil 3 becomes one lower point of the interior of the protective body pulled down. At this low point is the Cooling water channel interrupted and has an outlet opening 11, so that the whole of the coil flowing through Coolant enters the interior. From here the coolant comes out on the side walls, d. H. around the bobbin and through holes 7 to 9 in the interior space above the bobbin and is sucked out of this via an opening 10 in the power supply 6. In the illustrated embodiment the power supply 6 is soldered to the coil end 13 at point 14. Basically The coil end 13 can of course also only be bent at point 14 and provided with an opening are, while the flow of coolant to the power supply 6 by caulking the coolant channel is prevented.

In order to make the mounting of the coil in the protective body 2, for example a quartz body, elastic, an insulated wire 12 fastened in the protective body 2 can be provided in a simple manner, which is connected to one of the two power supply lines, in the illustrated embodiment with the return 6, on a blanked section 15 is soldered. The second power supply 5 can also be attached to this jumper wire with appropriate consideration of the insulation.

709 660/350

It is of course possible within the scope of the invention, with a corresponding shaping of the protective body and coil to use the inductor also for heating flat surfaces.

Claims (5)

5 claims 1. Inductor for heating curved surfaces, especially the inner walls of bores in metallic workpieces, consisting of at least a single wind through which cooling water flows Coil and a protective body surrounding it, characterized in that that the cooling water channel at the end of the coil in a preferably lower point of the interior of the protective body ends and means for discharging the cooling liquid are provided above the coil. 2. Inductor according to claim 1 with an iron core, preferably in twisted roll form, for improvement the magnetic yoke, characterized in that the iron core with holes is provided for the passage of the coolant. 3. Inductor according to claim 1 or 2, characterized in that the lower lying Coil end outgoing current return (6) to a point lower than the coil end is pulled down and at this point with simultaneous interruption of the coolant flow an outlet opening is provided. 4. Inductor according to claim 1 to 3, characterized in that the containing the coolant channels Power supply lines (5, 6) are elastically attached to the upper end of the protective body (2) via an intermediate member. 5. Inductor according to claim 4, characterized in that an insulated intermediate member Wire is provided which is soldered to a bare section with one of the power supply lines is. 1 sheet of drawings © 709 6W35i 8.