Ngk Insulators, Inc.

Toshiyuki Mima

Shoji Seike

Masayuki Nozaki

Mitsuji Ikeda

Naoki Tani

Hideki Shimizu

Takao Totoki

Koichi Mori

Hirohiko Iwasaka

Michimasa Fujii

An excellent stable sodium-sulfur cell having a high mechanical strength and a very long life is provided. The cell eliminates formation of cracks in a joining portion of the solid electrolyte tube and the insulative ring of the cell with the aid of a solder glass filled in a gap between the solid electrolyte tube and the insulative ring, preferably with the aid of a tapered portion formed at at least one of the solid electrolyte tube and the insulative ring, thereby to completely obviate a direct reaction of active substances of the positive electrode and the negative electrode, overheating and destruction of the cell. The sodium-sulfur cell, includes a solid electrolyte tube, an insulative ring, a gap of 100-500 .mu.m formed between the solid electrolyte tube and the insulative ring, and a solder glass filled in the gap for joining the insulative ring to the solid electrolyte tube.

Sodium-sulfur cell and method of joining solid electrolyte tube and

An optical fiber composite insulator including a hollow insulator body having an axial through-hole and at least one optical fiber extended through the through-hole and hermetically sealed to the inner surface of the through-hole by a sealing material. A relationship between a condition of the inner surface of the through-hole and the sealing material, a relationship between the inner diameters of the through-hole and the outer diameter of the hollow insulator body or a coating material on the optical fiber are selected to provide high insulating property, mechanical strength and airtight property of the optical fiber composite insulator.

Optical fiber composite insulator

An optical fiber composite insulator comprises a hollow insulator body having an axial through-hole and at least one optical fiber extended through the through-hole and hermetically sealed to the inner surface of the through-hole by a sealing material. A relationship between a condition of the inner surface of the through-hole and the sealing material, a relationship between the inner diameters of the through-hole and the outer diameter of the hollow insulator body or a coating material on the optical fiber are selected to provide high insulating property, mechanical strength and airtight property of the optical fiber composite insulator.

Optical fiber composite insulator and method of producing the same

An excellent lightning arrestor insulator is provided having a discharge gap portion and an arrestor ZnO element device both built in a body of the insulator, comprising projected discharge electrodes arranged in the inside of the insulator body, the discharge gap portion being formed of a heat resistant protrusion arranged in the inside of the insulator body and surrounding the discharge electrodes, and a pair of metal plates and/or electrically conductive ceramic plates sandwiching the protrusion from both sides thereof and electrically connected to the discharge electrodes, the pair of plates being joined and airtightly sealed to the protrusion via an inorganic glass. The arrestor ZnO element device has a highly reliable airtight fixing and sealing structure so that accidents in a power supply or distribution line at a normal working voltage can be substantially eliminated, and damages caused by hygromeration and lightnings can be noticeably decreased.

Lightning arrestor insulator and method of producing the same

An optical fiber-containing insulator including an insulator body having a through hole and an optical fiber inserted into the through hole in which an insulation gas or an organic material is filled in a middle portion of the through hole, the insulator comprising wide-mouthed portions arranged in both end portions of the through hole, cylindrical members inserted into the wide-mouthed portions and heat-resistive adhesive agent member arranged between the insulation gas or organic insulation material and the cylindrical member. A process for producing such an optical fiber-containing insulator is also disclosed.

Optical fiber-containing insulators and producing process thereof

An optical fiber-containing insulator including an insulator body having a through hole provided in a central portion thereof, an optical fiber inserted into the through hole, a stepped portion formed in the through hole at at least one end of the insulator body, a sealing section consisting of a pair of holders provided at upper and lower ends of the stepped portion, an inorganic glass layer sandwiched between the holders, and a protective layer formed on the outer holder. A process for producing such an optical fiber-containing insulator is also disclosed.

A high voltage porcelain insulator having a glaze applied to at least a head portion of the insulator which head portion is covered by a metal fitting and a cement. The glaze essentially consists of, in terms of weight, from 64.0 to 68.0% of SiO.sub.2, from 17.5 to 19.0% of Al.sub.2 O.sub.3, from 5.0 to 6.5% of MgO, not more than 3.0% of CaO, from 2.0 to 2.8% of K.sub.2 O and Na.sub.2 O in a total amount, and from 3.0 to 9.0%, when calculated as MnO, a compound which is converted to MnO and or MnO.sub.2 after being fired at a temperature range suitable for firing porcelain.

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Nagoya, Japan

Toshiyuki Mima