GB190708379A - Device for Automatically Balancing the Axial Pressure on Rotating Vane-carrying Parts of Elastic Fluid Turbines. - Google Patents

Abstract

8379. Ljungstr÷m, B. April 11, 1906, [date applied for under Patents Act, 1901]. Elastic-fluid turbines.-End thrust in elastic-fluid turbines is automatically balanced by the use of pressure chambers containing balancing - pistons packed by baffling-devices, the passages through the last being varied by the axial shifting of the shaft, thereby varying the balancing pressure. A radial-flow turbine with oppositely-running rotors is shown in Fig. 1. Different forms of the invention are shown applied to the two rotors. The rotors j, k have a tendency to separate, which is counteracted by the pressure in chambers q. The working fluid is admitted by an inlet l and passes along channels m in the left-hand rotor to the space between the rotors. A portion of the fluid passes through channels m in the right-band rotor and is admitted to the chamber q through a baffling- device p, the fluid eventually flowing away through a baffling-device o. These baffling - devices are so situated that on the axial shifting of the rotor the leakage is increased in one and diminished in the other, thereby varying the pressure in the chamber q. In the case of the left-hand rotor, the baffling-device p consists of a single constriction. The invention may be applied to parallel - flow turbines with stepped drums. The turbine drums are shown on the left of Fig. 2, and the balancing- pistons on the right. Steam is admitted through au inlet e and flows right and left. Baffling-devices f, are arranged so that on the axial shifting of the shaft the leakage increases through one set and diminishes through the other. In a modification the baffling-devices r<1>, s<1>, Fig. 3, are formed with a conical section. In this modification the balancing pressure acts on a disk separate from, but secured to, the vane-carrying disk.