Ngk Insulators, Inc.

Dow Corning Toray Silicone Company Limited

Isao Nakajima

Yusuke Utsumi

Noriyasu Oguri

Shoji Seike

Shigehiko Kunieda

Koji Hayakawa

Takao Matsushita

Hidenobu Misawa

Kazuo Hirai

Katsuya Baba

Toshiyuki Kawaguchi

Kazumi Nakanishi

Katsuro Shinoda

Tetsuhiko Abe

Takayuki Takeda

Yukihiro Koshino

Hiroshi Harada

A composite insulator includes a hollow and tapered core portion composed of fiber-reinforced plastics, and a sheath and sheds composed of an insulating polymeric material integrally molded on the outer surface of the core portion. The core portions of composite insulators for a plurality of voltage classes are formed by using a mandrel assembly in which a plurality of mandrel members are combined. The so-prepared core portion is placed within a mold unit in accordance with the voltage class of the composite insulator to be manufactured, and the insulating polymeric material is poured into the mold cavity to integrally mold the sheath and the sheds.

Set of hollow and tapered composite insulators with a one piece core

An excellent polymer insulator is provided which can be formed by casting a composition in a mold and which after heat-curing have a silicone rubber coating layer on an outer circumferential surface of a glass fiber-reinforced plastics core thereby providing superior electric insulation properties including weather resistance, tracking resistance and erosion resistance, etc. in severe conditions of air pollution, salt damaging or severe climate.

Polymer insulator

A composite insulator-producing lateral type molding apparatus includes a mold body constituted by a first molding unit and a second molding unit, each of said first and second molding units being provided, at an inner peripheral face, with recesses for the formation of a housing constituted by a plurality of shed portions and a axial portion connecting these shed portions, means for opening or tightening the first molding unit and the second molding unit, a pouring passage for pouring a housing-forming material into said recesses, and housing-forming material escape holes. A core member of the insulator is placed between the first and second molding units, the first and second molds are tightened, and the housing-forming material is poured into said recesses to form the housing. The first molding unit and the second molding unit extend laterally, and that the core member is laterally arranged horizontally between first and second molding units.

Lateral type molding apparatus for the production of composite insulators

A composite insulator having a core member and a housing member integrally arranged around the core member, the housing member being constructed by a trunk portion and a shed portion, has a creepable distance extending means arranged on a lower plane of the shed portion. Moreover, a segment used for producing the composite insulator has a pair of segment molds detachably connected at a partition plane having a through-hole at its center portion through which the core member is arranged, an upper plane forming portion arranged at its one end surface for defining an upper plane of the shed portion, and a lower plane forming portion arranged at its other end surface for defining a lower plane of the shed portion; and a partition for forming the creepage distance extending means arranged at the lower plane forming portion. Further, the composite insulator is produced by arranging the core member in a through-hole of a mold constructed by integrating a plurality of segments, supplying an elastic polymer material into a space between the mold and the core member, curing the elastic polymer material and separating the mold at the partition plane.

Composite insulator, segment used for producing the same and method of

A segment used for producing a composite insulator having a core member and a housing member arranged around the core member and constructed by a trunk portion and a shed portion is disclosed. The segment has a pair of segment molds detachably connected at a partition plane and a heating and cooling passage arranged in the segment molds respectively. The segment molds have a through-hole through which the core member is arranged, an upper plane forming portion arranged at its one end surface for defining an upper plane of the shed portion, and a lower plane forming portion arranged at its other end surface for defining a lower plane of the shed portion. A heating or cooling medium is passed through the heating and cooling passage. Moreover, a mold is constructed by integrating a plurality of segments with the heating and cooling passage mentioned above.

Segment with heating and cooling device and mold using the segments

An insulator includes a housing portion. The housing portion is composed a silicone rubber obtained by curing a composition containing diorganopolysiloxane (A) and a fine silicon powder (B) by heating, and a methylalkylpolysiloxane oil (C). The diorganopolysiloxane has at least two silicon atom-bonded alkenyl groups in one molecule. The methylalkyl-polysiloxane oil (C) has each of both terminal ends of each molecular chain blocked with a trialkysiloxy group and possessing a viscosity at 25.degree. C. being 1 to 1,000 centistokes, and is incorporated into the above composition in an amount of 1-100 parts by weight per 100 parts by weight of the component (A).

Insulators

An optical fiber composite insulator which includes an insulator body having a through-hole formed in its axis portion and at least one optical fiber extending through the through-hole and sealed in the through-hole by an inorganic vitreous sealing material at both end portions of the through-hole. The sealing material has substantially the same thermal expansion coefficient as that of the insulator body, has high resistances against breakage in the power frequency voltage test and in the lightning impulse voltage test, against crack formation in the cooling and heating test, heat proof test and heat cycle test, and against the light-transmission loss.

Method for producing an optical fiber composite insulator

An optical fiber composite insulator which including an insulator body having a through-hole formed in its axis portion and at least one optical fiber extending through the through-hole and sealed in the through-hole by an inorganic vitreous sealing material at both end portions of the through-hole. The sealing material has substantially the same thermal expansion coefficient as that of the insulator body, has high resistances against breakage in the power frequency voltage test and in the lightning impulse voltage test, against crack formation in the cooling and heating test, heat proof test and heat cycle test, and against the light-transmission loss.

Optical fiber composite insulator

Optical fiber-containing insulators each comprises an insulator body having a through hole provided in its central portion and extending along an axial direction thereof, an optical fiber core wire passing through the through hole, an insulating material filled between an inner peripheral surface of the through hole and the optical fiber core wire, and arrangements for preventing the filled insulating material from axially protruding out of the insulator body even at high temperature or spacers for holding the optical fiber core wire at the central portion of the through hole of the insulator body.

Growing community of inventors

Nagoya, Japan

Isao Nakajima