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:
Jun. 16, 1987
Filed:
Oct. 01, 1985
Kazuhiko Matsuo, Yokohama, JP;
Teruyuki Hasegawa, Yokohama, JP;
Seigo Kuwano, Tokyo, JP;
Ryuji Yamaguchi, Yokohama, JP;
Akio Shiwata, Fukuyama, JP;
Yoneichi Hamada, Fukuyama, JP;
Yoshimi Komatsu, Fukuyama, JP;
Tsuneo Kondo, Fukuyama, JP;
Yusuke Shirotani, Fukuyama, JP;
Hirohisa Nakashima, Fukuyama, JP;
Yasuhiro Matsuda, Hiroshima, JP;
Nippon Kokan Kabushiki Kaisha, Tokyo, JP;
Abstract
The gap between an insertion hole formed in a covering of a ladle and an electrode inserted through the insertion hole is sealed by sealing means. The sealing means has a cap seal longitudinally and slidably fitted over the electrode. A base seal is hermetically disposed between the cap seal and the covering in such a manner that a gap is provided between the electrode and the base seal. The base seal has a gas injection nozzle intended to discharge a gas toward the electrode and another gas injection nozzle intended to discharge the gas downwardly. The use of the base and cap seals enables securing the sealing functions thereof despite any movement of the electrode, thus preventing the pickup of [N] as well as the reoxidation of molten steel. When a gas seal is effected by the formation of a flow of gas rotating around the electrode about the axis thereof, the sealing performance can be more enhanced. Further, when the base seal is cooled by causing cooling water to be circulated therethrough, its durability can also be enhanced.