The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 02, 1994
Filed:
Apr. 23, 1993
Hiroyuki Kato, Yokohama, JP;
Ebara Corporation, Tokyo, JP;
The Tokyo Electric Power Company Inc., Tokyo, JP;
Tohoku Electric Power Company Inc., Sendai, JP;
Chubu Electric Power Company Inc., Nagoya, JP;
Hokuriku Electric Power Company, Toyama, JP;
Chugoku Electric Power Company, Inc., Hiroshima, JP;
The Japan Atomic Power Company, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Hitachi Ltd., Tokyo, JP;
Abstract
A thermal fatigue prevention apparatus for a high temperature pump which includes an impeller in a high temperature pump casing, a pump shaft rotatably supported by a journal of a submerged bearing and projecting from a shaft through hole of a casing cover, and a shaft sealing device. The shaft sealing device is enclosed with a shaft sealing chamber which is supplied with a low temperature seal purging liquid, and a part of the seal purging liquid flows into the pump casing through the shaft through hole. A heater is provided within the high temperature pump, the heater raises the temperature of the low temperature seal purging liquid before the seal purging liquid flows into the pump casing by using the high temperature pumping liquid.