DE1046215B - Inductor for heating curved surfaces, especially the inner walls of bores, metal workpieces - Google Patents

Description

The main patent application relates to a known inductor for heating curved surfaces, in particular the inner walls of bores, metallic workpieces, consisting of at least one single-wind coil with an iron core through which cooling water flows and a coil and iron core surrounding the coil Protective body, with the cooling water channel at the end of the coil in a preferably lower position Point of the protective body interior ends open and means for discharging the cooling liquid above the Coil are provided.

The protective body of this inductor is not only used for electrical insulation from the one to be heated Workpiece, but also for mechanical protection of the inductor. For electrical isolation is particularly suitable for quartz or hard glass. These substances, which are known per se for the protection of inductors, but are not particularly reliable as mechanical protection because they are shock-sensitive and light break.

According to the invention, this deficiency is eliminated in that the protective body consists of the following three parts is built up: one surrounding the coil including the iron core - preferably only the coil including Iron core enclosing - cylindrical center piece made of quartz or tempered glass and two end pieces - a head end piece and a connection end piece - made of metal or plastic. The shock resistance of the inductor according to the invention or its protective body is hereby much larger, since just the Ends of the protective body are particularly at risk of impact; however, the coil and iron core are reliable electrically isolated. The invention also offers the further advantage that the effort involved expensive quartz is significantly reduced.

In the drawing, an embodiment of an inductor according to the invention is shown in longitudinal section. The inductor consists of a coil 1 on an iron core 2. It is provided with a protective body surrounded, which consists of a cylindrical center piece 3, a head-end piece 4 and a connection end piece 5 exists.

The coil 1 is made of a helically bent tube. That closes at its upper end Cooling water supply pipe 6 on, and at its lower end a short piece of pipe 7 is attached, which is directed downwards is and opens with its free end open into the interior of the protective body. The iron core 2 has roughly the shape of a twisting roll and, as already stated in the main patent, has some Provided through holes through which the two interior parts of the protective body above and below the Iron core or the coil are fluidly connected to each other.

Inductor for heating curved

Surfaces, especially the

Inner walls of bores,

metallic workpieces

Addition to patent application S 48744 VIIId / 21h
^: "(Auslegeschrift 1015159)

Applicant:

Siemens-Sctmckertwerke ■
Corporation,
Berlin and Erlangen,
Erlangen, Werner-von-Siemens-Str. 50

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

A cooling water drain pipe 8 protrudes through the connection end piece 5 into the protective body; it has a mouth opening 9 above the coil and protrudes into a continuous central bore in the iron core into it. By means of a screw 10, which is screwed into the lower end of the tube 8, this Head-tail 4 held. The edge of the two end pieces 4 and 5 is supported on the iron core 2, under Interposition of an insulating ring 11 and a sealing ring 12.

In the connection end piece 5, a socket 13 is used, the protruding edge 14 against a Projection of the end piece 5, with the interposition of a sealing ring 15, is supported. Through the socket 13 protrude through the two tubes 6 and 8. The cavity of the socket 13 is covered with an insulating material 16, preferably a cast resin, poured out, which not only closes the socket opening in a liquid-tight manner, but at the same time also a firm mounting of the two tubes 6 and 8 and thus also a firm connection of the end piece with the inner parts of the protective body is guaranteed. To further increase of this mechanical connection, the tube 8 also has annular beads 17. Since the head-end piece 4 is firmly connected to the tube 8 by the screw 10 and is supported on the iron core, and there the two Edges of the cylindrical center piece 3 lie in recesses of the two end pieces, so are herewith all parts of the inductor and its protective

809 698/404

body mechanically firmly united with one another. Finally, there is an electrically conductive one in the drawing To see connector 18, which is an electrical line connection between the pipe section 7 and the lower end of the tube 8 produces.

The power supply to the coil 1 takes place on the one hand via the pipe 6 and on the other hand via the connecting piece 18 and the pipe 8. The cooling water flows through the pipe 6, passes through the coil 1, enters through the pipe section 7 into the interior of the protective body and leaves it through the opening 9 and the drain pipe 8.

According to the invention, the middle piece 3 of the protective body is made of quartz, while the two end pieces 4 and 5 are made of metal or plastic. By restricting the quartz to the center piece Not only does the cost of expensive quartz decrease, but the shock resistance of the Increased inductor or its protective body. The center piece made of quartz is used for reliable electrical insulation against the workpiece to be heated and must therefore be at least as long as how the coil and iron core extend; on the other hand, the middle piece can save quartz be chosen so short that it protrudes as little as possible over the length of the coil and the iron core.

The embodiment of the inductor shown in the drawing also offers one in terms of production significant advantage, as the inductor can be assembled from only a few prepared sections can: The coil wound on the iron core forms 6 and 8 with the tubes attached to it a structural unit anyway. The socket 13 can also be included in this structural unit of the inductor are pushed onto the tubes 6 and 8 before the inductor is assembled and can be sealed by introducing the casting resin 16. When assembling the Inductor, this prepared unit is pushed into the upper end piece 5, then the quartz center piece 3 put on and finally the head-end piece 4 screwed on, each with an interposition the sealing and insulating rings 11, 12 and 15. If one of the sections of the inductor occasionally needs to be replaced, only the screw 10 needs to be unscrewed to all To be able to take apart individual pieces without further ado.

As mentioned, the two end pieces 4 and 5 are made of metal or plastic. As a metal is suitable for example copper, aluminum, brass. Are the end pieces made of metal, and are the insulating rings made 11 made of an elastic material, the sealing rings 12 can be omitted. Exist the end pieces, however, are made of a plastic, so the insulating rings 11 are dispensable.

The three-part design of the inductor according to the invention is not necessarily tied to the fact that the protective body is sealed liquid-tight on all sides, although the liquid-tight training the operational reliability of the inductor is greatly increased.

Like the inductor according to the main patent, the inductor according to the invention can also be used for heating purposes curved surfaces can also be used for heating flat surfaces, if desired below corresponding adaptation of the shape of the protective body and the inductor coil to the flat workpiece surface.

Claims (5)

Patent claims: 1. Inductor for heating curved surfaces, especially the inner walls of bores, metallic workpieces, consisting of at least a single wind through which cooling water flows Coil with iron core and a protective body surrounding this coil including iron core, according to patent application S 48744 VIII d / 21h (DAS 1 015 159) the cooling water channel at the end of the coil in one preferably lower point of the protective body interior ends open and means for discharge the cooling liquid are provided above the coil, characterized in that the Protective body is made up of the following three parts: one surrounding the coil including the iron core - preferably only the coil including the iron core enclosing - cylindrical center piece Quartz or tempered glass and two end pieces - a head end piece and a connection end piece - made of metal or plastic. 2. Inductor according to claim 1, characterized in that the iron core with a through hole is provided in its longitudinal axis that the cooling water discharge pipe in this through hole protrudes into or through them and that the head-end piece at the free end of the discharge pipe is held. 3. Inductor according to claim 2, characterized in that the head-end piece on the discharge pipe is fastened by means of a screw engaging in this and that the discharge pipe above the Coil has an opening. 4. Inductor according to claim 2 and 3, characterized in that the edge of the two end pieces or one of them is supported on the iron core - with a metallic design of the end piece with the interposition of insulating material. 5. Inductor according to claim 1 to 4, characterized in that a socket in the inlet opening is used, which is at its lower end with an annular shoulder against a projection the protective body is supported, and its interior is sealed liquid-tight with a casting resin is. Considered publications:
German Auslegeschrift 1 015 159. 1 sheet of drawings © S09 698/404 12th SS