Title:
【発明の名称】軸封システム装置
Document Type and Number:
Japanese Patent JP2766875
Kind Code:
B2
Abstract:
A shaft sealing apparatus capable of preventing gases vaporized from a gas seal or purge fluid from leaking outside before a pressure switch operates due to a pressure rise resulting from a fluid leakage from a mechanical seal. The apparatus comprises a seal casing and a rotary shaft (2) passing through the former hand having a mechanical seal (A) and a dry gas seal (B) mounted thereon in line with each other to provide purge fluid areas (C) therebetween. With this arrangement, a purge fluid is supplied to one of the purge fluid areas through a supply line having an orifice (OA) and the supplied purge fluid and a leaked part of a target fluid to be sealed are released outside from the other purge fluid area through a relief line having an orifice (OB). The relief line is provided with a bypass line with an electromagnetic valve and a pressure switch and bypassing the orifice (OB). In this case, the purge fluid supply pressure (P1), the preset pressure (P2) between the orifices (OA) and (OB) the pressure (P3) in the area from the orifice (OB) to outside and the pressure weitch operating pressure (Ps) satisfy the relationships of P1 > Ps > P2 > P3.
Inventors:
FUSE TOSHIHIKO
Application Number:
JP10997195A
Publication Date:
June 18, 1998
Filing Date:
April 10, 1995
Export Citation:
Assignee:
NIPPON PIRAA KOGYO KK
International Classes:
F16J15/16; F16J15/34; F16J15/40; (IPC1-7): F16J15/16; F16J15/34; F16J15/40
Domestic Patent References:
| JP62188858A |
Attorney, Agent or Firm:
Kichi Toshio Kawa