GB190711270A - Improvements in Elastic Fluid Turbines. - Google Patents

Abstract

11,270. Ehrhart, R. N. May 16, 1906, [date appliedfor under Patents Act, 1901]. Elastic-fluid turbines.-To balance the axial thrust in an axial-flow turbine, in which the fluid is expanded in stages, the final stage of the rotor is divided into two portions through which the fluid flows in opposite directions, and dummy pistons are also provided to complete the balancing effect. The intermediate section 6 of the rotor is of larger diameter than the initial section 5, and the final stage comprises one portion 17 of large diameter and another portion 18 of small diameter. The fluid flows directly from the chamber 16 through the portion 17, and also through a passage 22 inside the portion 17 to the portion 18 through which the fluid then flows in the opposite direction to the exhaust 24. Dummy pistons 28, 25 are provided, and are furnished with labyrinth or other packing. The exhaust 24 is connected with the space 35 by means of a passage 36 to equalize the pressures, and the chamber 15 is similarly connected by means of a passage 27 with the space 36 to equalize the pressures, and the chamber 15 is similarly connected by means of a passage 27 with the space 26. The thrust of the initial section 5 is balanced at the face of the dummy piston 28 exposed in the chamber 11, and the thrust of the intermediate section 6 is balanced at the face of the dummy piston 25 exposed in the chamber 26. The thrust on the end 31 of the rotor together with that on the section 18 is balanced by the thrust on the face 32 together with that on the section 17. The thrust on the aunular face 33 is balanced by that on the face 34 of the dummy piston 25, so that the thrusts throughout the turbine are completely balanced. In a modified form, the intermediate section is divided, and one portion of the fluid is led from the passage between the divisions through the interior of the rotor to the end portion of the final section as before, the other portion of the fluid being led directly through the remaining blades of the intermediate and final sections to the exhaust. In a further modified form, the intermediate portion is again divided as in the lastmentioned form, but the second portion of the intermediate section is larger in diameter than the first portion.