GB595348A - Improvements in internal combustion turbine plant - Google Patents

Abstract

595,348. Cooling bearings. BAUMANN, K., and METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. Sept. 22, 1941, No. 12274. [Class 12 (i)] [Also in Group XXVI] In a gas turbine plant, for the propulsion of aircraft, air taken from an intermediate stage of the compressor is used for cooling the shaft bearing near the turbine disc and the chamber enclosing the bearing is itself enclosed in a chamber to which is admitted air taken from the compressor delivery. This latter air passes to a space between the turbine rotor and a cover disc and thence to the turbine blade stream. The turbine disc stub shaft 3 and the compressor rotor 21a are coupled by a tubular shaft 21 which includes a flanged part 15 bolted to the shaft 21 and held in place by a locking bolt 18 as described in Specification 582,123. [Group XXIII]. The part 15 and the stub shaft 3 have a number of interengaging splines 16. The inner ball-race is held between bushes 48, 50, surrounding a bush 44 and is clamped by a flanged end nut 52. The outer ball-race is carried by a bull ring 59 splined to a sleeve 63 secured by screws to the part 7 integral with the tubular inner structure 8. The bull ring is held resiliently by opposed axial springs 76, 81 supported by rings 69, 78 fast on the part 7. Interstage air is led along a central tube 22 and enters the bearing chamber by ports 41, 42. From the port 41 it passes along grooves in the splines 16 and emerges through ports 98, 99, into a chamber X and thence to the enclosing chamber 6 which is exhausted to atmosphere. From the port 42, it passes through a port 71 in the ring 69, along grooves in the splines 61 coupling the bull ring to its carrying sleeve 63 and out into the chamber X. Air from the port 42 also passes round the annular space 66 to a port 97 and through ports and spaces provided by the sleeves 44, 48, to the chamber X. Oil is admitted to the bearing chamber through a spraying device 85 and a nozzle 83 and passes out to a chamber 94 and a pipe 96. Ports 107, 109a provide a passage for cooling air into the chamber 94 and this air entrains any oil that'may have passed the sealing pistons 75, 82 of the bearing chamber. Labyrinth packings 88 with intermediate leak ports 92 at one end and packings T. U with leak chambers X. Z, at the other end protect the bearing assembly from the hot highpressure air The chamber 6 is connected to atmosphere by the space between the inner structure and a coned part 24 and the central hollows 14 of ribs between the walls 11, 12 of the compressor delivery. Specifications 589.541. 589,542. [both in Group XXVI], and 595,346 also are referred to.