| 摘要 |
966,352. Turbines; centrifugal pumps. L. BOLKOW, [trading as BOLKOW-ENTWICKLUNGEN K.G.]. Feb. 12, 1963 [Feb. 13, 1962], No. 5665/63. Headings F1C and FIT. [Also in Division F2] In an embodiment, a shaft 11 has a gas turbine rotor 12 and a pump impeller 13 thereon and is mounted, by means of a roller bearing 14 and a ball bearing 15, in a housing 8. A sliding-ring packing 17 is positioned on the turbine side; a labyrinth packing 18 is positioned between the bearings 14, 15; and a labyrinth packing 22 is positioned between the bearing 15 and the impeller 13. The inlet side of the pump impeller 13 communicates, via a bore 28 and a conduit 29, with a lubricant-tank 60. The lubricant pressurised by the impeller 13 is passed, through a bore 62, a distributor point 63 and conduits 61, 64 to a consuming unit 65. A lubricant pipe 52 leads to a regulating valve 2 which is connected by a lubricant pipe 53 and bore 70, in a housing 25 to the packing 17. The valve 2 is also connected, via a pipe 51 and bores 71, 81, with a clearance space 72, the bore 81 being in the turbine inlet guide blade ring 24. A starting regulating valve 2b may be included in the circuit. In use, lubricant is supplied from the tank 60 to the pump via the pipe 29 and the bore 28 and is forced by the impeller 13 to the distributor point 63, where part of the lubricant is distributed to the unit 65 and part is distributed to the valve 2 so as to have the lubricant pressure reduced. The lubricant leaves the valve 2 and passes, through the pipe 53 and the bore 70, to the packing 17. The turbine working medium in the space 72 effects a pressure on the other side of the packing 17. Thus the latter receives pressure at each side thereof and no flow takes place therethrough. The lubricant flows from the packing 17, through the bearing 14, the packing 18, the bearing 15 and the packing 22, back to the impeller 13. In a modification, the packing 17 comprises two sliding rings having an annular space therebetween supplied with inert gas, the pressure of which is regulated by a valve 2. In another modification, the two sliding rings are replaced by two labyrinth packings. |
