| 摘要 |
1286905 Rotary shaft seals BROWN BOVERI SULZER TURBOMACHINERY Ltd 27 Feb 1970 [28 Feb 1969] 9648/70 Heading F2B In a seal for a rotating shaft 1 comprising two sealing rings 8, 9 housed side-by-side in a sealing chamber 5 supplied with a barrier fluid, the facing ends of the two rings being spaced apart and the opposite ends bearing with at least one annular part against the chamber walls 10, 11, the ring 9 on the high pressure side of the seal has passages 14 therein between its ends through which passages barrier fluid flows from the chamber 5 to the space 16 between the rings and cools the ring 9. The barrier fluid is supplied to the chamber 5 through a bore 15 and flow of fluid direct to the space 16 is restricted by a flange 17 on the ring 8. The rings 8 and 9 are urged apart by springs 18 and prevented from rotation by pins 19 and 20 loosely engaging bores in a flange 6 and sleeve 7 respectively of the seal housing. The ring 9 has helical grooves (not shown) on its inner periphery handed so that they tend to return fluid between the shaft and the ring 9 to the space 16. The barrier fluid is supplied to chamber 5 at a pressure exceeding that in the interior 2 of the housing 3 and fluid flowing between the shaft and the rings 8 and 9 is collected in chambers 21 and 22, respectively. There may be ten or more passages 14 which may be provided by pores if the ring 9 is made of porous metal. |
