| 摘要 |
1365084 Shaft seals GENERAL ELECTRIC CO 27 Sept 1971 [29 Dec 1970] 44887/71 Heading F2B A shaft seal between two components which rotate relatively to one another comprises a sealing ring 28, Fig. 3, subject to relatively high pressure P1 of liquid or gas on one side and a lower pressure P2 on its opposite side, a radial seat 30 on one component for supporting the ring, a groove in the other component for receiving the ring, and means, such as a passageway 56, for connecting the high pressure side to the gap on the low pressure side between the end face of the ring and the wall 40 of the groove for generating a force on an end face of the ring which varies in response to changes in the dimension of the gap to centre the ring and reduce rubbing forces at the end face. As shown, the ring 28 is a split ring of carbon or metal and is held against a rotary outer shaft 32 by centrifugal force and inherent spring force. As regards the radial forces, an inward force is created by subjecting the outer periphery to high pressure through slots 44 and a groove 42 and subjecting the inner periphery to low pressure through vent holes 54. As regards the axial forces, high pressure acts on one end of the ring through a passageway 56 and the ring is balanced in the groove by the high pressure acting on the opposite end of the ring through orifices 52 and grooves 48. When the outer shaft is non- rotary, Fig. 10, the ring 72 is held against the stationary radial seat 76 by the high pressure acting on a lip 74. In Fig. 8, the ring 60 is a continuous ring and is sealed against the radial seat 66 by a split ring 64.
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