Method of producing a wound insulating pipe

Details Method of producing a wound insulating pipe Method of producing a wound insulating pipe

1999-12-27

2001-03-20

Yao, Sam Chuan (Department: 1733)

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

C156S173000, C156S187000, C385S104000, C385S113000

Reexamination Certificate

active

06203647

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a method of producing a wound insulating conduit, in particular for a high-voltage insulator, with at least one channel for conductors, optical fibers or the like to be pulled in subsequently.
BACKGROUND INFORMATION
Insulating conduits and high-voltage insulators with integrated conductors, optical fibers in particular, are known in a variety of embodiments. European Patent No. 0 265 737 describes such an arrangement, where an optical fiber is wound in a spiral along an optical fiber carrier, the latter of which is in turn designed as an insulating wind located in a an cavity of a high-voltage insulator.
Another arrangement is described in U.S. Pat. No. 3,485,940, where an optical fiber is surrounded by a polyester tube which passes through a core of a insulator in a longitudinal direction.
European Patent No. 0 146 845 describes another high-voltage insulator, where a light guide is carried longitudinally through the insulator in a groove in an intermediate layer arranged between a core and shielding elements.
With the high-voltage insulators described below, the optical fiber is usually pulled subsequently into the prefabricated insulator or insulating conduit. German Patent No. 27 55 734 describes the use of longitudinal grooves forming channels to accommodate the optical fibers with these channels then being closed. Similarly, it is described in French Patent No. 0 2 725 302 that a groove in the form of a spiral can be provided in the wall of the insulator, and a continuous extruded ribbon of elastomer can be introduced into this groove. Then a optical fiber is placed on a top side of this ribbon and then the optical fiber and the ribbon are compressed, e.g., by rolling, to insert the ribbon into a bottom of the groove and embed it in the elastomer material.
German Patent No. 29 01 872 describes the use of an optical fiber in an intermediate layer running in a longitudinal direction, and exiting from this intermediate layer through holes.
German Patent No. 39 21 442 also describes the use of empty cables for subsequent insertion of optical fibers having an insertion aid for subsequent insertion of these optical fibers.
A conventional method of producing high-voltage insulators is by winding insulating conduits made of epoxy resinates with a laminate structure of glass fibers or synthetic fibers. Such insulating conduits are known from the brochure “MR-Isolierrohre ROTAFIL® für die Hochspannungstechnik” (MR-ROTAFIL® Insulating Conduits for High Voltage Technology), imprint VK23-0/88de. In these winding methods, it is not readily possible to wind empty conduits, because it results in air-filled gaps at a side of the wound empty conduit having a negative effect on dielectric and electrical properties.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a suitable method of producing a wound insulating conduit with at least one integrated channel for subsequent insertion of at least one optical fiber, where the total cross section of the insulating conduit produced in this way is to be filled with material, i.e., there will not be any air-filled gaps in an area of the at least one integrated channel.
In addition, a contour should differ only insignificantly from a circular shape.
A special advantage of the method according to the present invention is that winding a molded body composed of at least one empty conduit and lateral, curved or flexible projections ensures that no cavities, i.e., air inclusions, can develop in winding the conduit that would have a negative effect on electric or dielectric properties. It is possible to design the lateral projections on the molded body with a curvature which is adapted to a curvature of a surface of the respective insulating conduit to which the molded body is attached. In such a case, winding without cavities is made possible due to the adapted curvature.
It is also possible to design the lateral projections on the molded body to be flexible, so that they can adapt to any surface curvature where they are to be attached and cavities can again be avoided in winding the conduit.


REFERENCES:
patent: 3485940 (1969-12-01), Perry et al.
patent: 4610033 (1986-09-01), Fox, Jr.
patent: 5087110 (1992-02-01), Inagaki et al.
patent: 27 55 734 (1978-07-01), None
patent: 29 01 872 (1980-07-01), None
patent: 38 15 717 (1989-11-01), None
patent: 39 21 442 (1996-01-01), None
patent: 0 146 845 (1985-07-01), None
patent: 0 265 737 (1988-05-01), None
patent: 0 720 181 (1996-07-01), None
patent: 2 725 302 (1996-04-01), None
patent: 58-107037 (1983-06-01), None
patent: 94 06127 (1994-03-01), None
MR Maschinenfabrik Reinhausen, “MR—Isolierrohre ROTAFIL® für die Hochspannungstechnik”, May 1991.

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