SU245218A1 - METHOD OF SEALING TUBULAR ELECTRIC HEATERS - Google Patents

Description

The invention relates to electrothermal, namely the manufacture of sealed tubular electric heaters TEN.

There is a known method of sealing tubular electric heating of gels by pre-fabricating an insulator, pressing it into its outlet rod and inserting the end of the insulator into the end of the heater sheath followed by welding to the outlet rod of the heater coil. However, this method is expensive, labor-intensive, and involves a welding operation.

In the proposed method of sealing tubular electric heaters, in order to increase the reliability of electric heaters and automate the sealing process, the sleeve is made with two internal conical surfaces, put it on the insulator with a partial girth of the electric heater shell, apply a force to the sleeve parallel to the axis of the heater in its direction , thereby ensuring that the insulator is pushed into the shell and the wall of the shell end is distributed before filling the conical gap between the sleeve with it an insulator.

application of little-studied materials. It is possible to precisely control the sealing process, shortens the sealing time, increases the reliability of the mechanical connection of the insulator to the tube. A tubular electric heater, sealed in this way, can operate at high humidity and at high temperatures; eliminates the need for welding,

productivity increases, it becomes possible to automate the process of sealing.

FIG. 1 shows a longitudinal section of the end of the tubular electric heater before sealing; in fig. 2nd, after sealing. The lead rod / is pressed into the ceramic insulator 2. This ensures its sealing. The tube 3 at the ends to seal has a cylindrical shape (see Fig. 1).

When sealing, the end of the tube 3 is clamped, for example, in the cams of the lathe, the insulator 2 is inserted into the end of the tube 3, then the contact 4 is inserted into the socket of the output rod, /, the insulator 2 is put on

sleeve 5. Then the sleeve 5 mandrel tightly pressed against the insulator 2 and is fed in the direction of the heating element (arrow) .. In this case, the sleeve carries an insulator, which, the entrance to the end of the tube, the conical surface of the gap 2 tightly to the inner surface of the tube , and the distributed end of it, filling the inner bore of the sleeve, tightly locks the last one. In turn, the sleeve firmly holds insulator 2 in a fixed position. Thus, using the sleeve 5, a tight connection is obtained between the tube 3 and the insulator 2.

Subject invention

The method of sealing tubular electric heaters by prefabricating an insulator with external conical surfaces, pressing the discharge heater into it

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a rod with a contact socket and insertion of the end of the insulator into the end of the electric heater shell, characterized in that, in order to increase the reliability of the electric heaters and automate the sealing process, a sleeve with two internal conical surfaces is made; apply a force to the sleeve parallel to the axis of the heater in the direction of its shell, while pressing the insulator inside the shell and distributing the wall of the end of the shell before filling the conical gap between the sleeve and the insulator.

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