| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an airtight holding structure improved to properly performing an airtight sealing by stably holding an O-ring interposed between a sealed container and a flange, in relation to a mounting flange, flange cover, and the like of a main circuit device placed on an opening of the sealed container constructed in a board of a gas-insulated switchgear. <P>SOLUTION: In the gas-insulated switchgear including the main circuit device contained in the metal sealed container 8 filled with insulating gas, the sealed container 8 and a flange member 14 are made of a thin sheet steel, and a bending is performed on one or both of a periphery of an opening 8a of the sealed container 8 and the flange member 14 to form an O-ring groove 15 for holding the O-ring in an interposed manner. The flange member 14 is then placed on the opening 8a of the sealed container 8 interposing the O-ring 12 set in the groove and bolted so as to perform the airtight sealing by pressurizing and compressing the O-ring 12. <P>COPYRIGHT: (C)2011,JPO&INPIT |
