JPS57134014A - Underwater bearing - Google Patents

Abstract

PURPOSE:To prevent a bearing from being damaged by muddy water by coupling a drain pipe opened above a water tank positioned at the lower end portion of a housing to a drain groove communicated with the inner surface of a bearing disposed on a bearing support. CONSTITUTION:A drain pipe 24 which is extended to a chamber 22 and opened above a water tank 20 disposed at the lower end portion of a housing is coupled to at least one drain groove 19 mounted on a bearing support 6. While a main machine is operated, pressurized clear water is supplied through a feed-water pipe for bearing to a bearing 5. Since the lower portion of the bearing 5 is provided with a water-seal device comprising gasket 10, there is extremely little leakage of water to the chamber 22, and water is discharged from the drain pipe 24 through the drain groove 19 to the water tank 20, further through a drain pipe 23 to the outside. Clear water having higher pressure than the water pressure of a draft tube 1 is supplied from a feed-water pipe for labyrinth 11 to a labyrinth seal 8, so as to prevent penetration of muddy water, earth and ground and so on.