| 摘要 |
1,215,960. Rotary shaft seals. COMMISSARIAT A L'ENERGIE ATOMIQUE. 15 Nov., 1968 [11 Dec., 1967], No. 54281/68. Heading F2B. A shaft 1 for transmitting rotary drive through a wall of a nuclear reactor vessel is centred by a fluid-film bearing 5 and axially located by a fluid-film thrust bearing 7 and sealed by means comprising two sets of labyrinth packing 11 and 13, one packing being located between the bearing 7 and the vessel exterior and the other between the bearing 7 and the vessel interior, an inert gas inlet 9 and shaft sealing rings 46 between the one packing and the vessel exterior, and two leakage ducts, one, 17, between the one packing and the gas inlet 9 and the other, 15, between the bearing 7 and the other packing. The duets 15 and 17 are connected to a source of suction. The shaft is housed in a bushing 33 which is sealed to a member 3 by metallic seals 35 and 37 from which any leakage is drained through ducts 39 and 41 respectively. The member 3 is secured to the nuclear reactor wall. Fluid, e.g. heavy water, is supplied to the bearings 5 and 7 via inlets 19 and 21 and inert gas is admitted to inlet 9 when transmitting drive. When the shaft is not in use, fluid supply to the inlets 9, 19 and 21 is cut off and the shaft is urged upward by the pressure in the vessel and is sealed by a metal seal 23, any leakage being drained off through a suction duct 25. |
