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Patent Searching and Data


Title:
TANDEM DOUBLE SEAL FOR NUCLEAR POWER PLANT
Document Type and Number:
WIPO Patent Application WO/2015/011812
Kind Code:
A1
Abstract:
The present invention provides a floating ring mechanical seal wherein the sealing surface of the floating ring appropriately contacts the sealing surface of a counterpart seal and exhibits excellent sealing capability even under conditions in which the pressure or temperature of a fluid to be sealed increases or decreases significantly. The present invention pertains to a floating ring mechanical seal wherein a floating ring (5) is compressed and held between a rotary ring (4) and a stationary ring (2), with the stationary ring (2) configured as an cylindrical body having an L-shaped cross section and comprising a thick annular main body part (21) one end of which contacts the floating ring (5), and a thin cylindrical retaining part (22) extending in the axial direction from the inner circumferential edge of the other end of the main body part, and with an O-ring (7a) interposed between a seal case (1) and the retaining part (22) at the inner circumferential part of the seal case, and fitted and retained so as to be capable of moving in the axial direction. In addition, the stationary ring (2) is formed of a metal material having a Young's modulus and/or a thermal expansion coefficient approximately the same as that of the material forming the floating ring (5).

Inventors:
NAKAZAWA SHUNPEI (JP)
NISHINO TERUYUKI (JP)
SHINJI HIROSHI (JP)
HIKIDA NAOTO (JP)
KATAYAMA KENJIRO (JP)
JIMBO MASAKAZU (JP)
KURIHARA MAKIKO (JP)
YOSHII TOSHIHIRO (JP)
NISHIYAMA KIKUO (JP)
SUGIYAMA KENICHI (JP)
YAMANOI TAKESHI (JP)
OHGA MITSUHARU (JP)
Application Number:
PCT/JP2013/070121
Publication Date:
January 29, 2015
Filing Date:
July 24, 2013
Export Citation:
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Assignee:
TOKYO ELECTRIC POWER CO (JP)
TOHOKU ELECTRIC POWER CO (JP)
CHUBU ELECTRIC POWER (JP)
HOKURIKU ELECTRIC POWER (JP)
CHUGOKU ELECTRIC POWER (JP)
JAPAN ATOMIC POWER (JP)
HITACHI GE NUCLEAR ENERGY LTD (JP)
TOSHIBA CORP (JP)
EBARA CORP (JP)
NIPPON PILLAR PACKING (JP)
International Classes:
F16J15/16; F04D29/10; F04D29/12; F16J15/34
Domestic Patent References:
WO2010116844A12010-10-14
Foreign References:
JP2010223332A2010-10-07
JP2000018392A2000-01-18
JPH08105447A1996-04-23
JP2000129420A2000-05-09
JP2012241724A2012-12-10
Attorney, Agent or Firm:
MIKI HISAMI (JP)
Hisami Miki (JP)
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