GB949907A - Turbo coupling - Google Patents

Abstract

949,907. Hydrodynamic couplings. C. SCHULER - VOITH, M. VOITH, H. W. SCHWEPPENHAUSER, and C. KNAPP, [trading as VOITH-GETRIEBE KOMM. GES.]. July 3, 1962 [July 4, 1961], No. 25507/62. Heading F2C. In a turbo coupling the filling of which is variable during operation, the filling ducts enter the working chamber at the radially inner part of its boundary wall, at which point a discontinuity in the boundary wall produces a region relieved of vortex flow the radial extent of which is less than 0.017 times the outer diameter of the working chamber. The fluid may be introduced into the working circuit between the impeller and the runner and the discontinuity may be produced by a baffle attached to the exit of the runner and projecting into the chamber a distance 0.01 times the outer diameter of the chamber. Alternatively, the discontinuity may be produced by a step in the boundary wall, the inner radius of the runner at its exit being greater than the inner radius of the impeller at its entrance, or the discontinuity may be produced by a change in direction of the radially inner boundary wall of the working chamber. As shown, the fluid enters the circuit through a port 8a formed between the impeller 3 and runner 2, the part 40 of the runner directly in front of the port 8a in the direction of flow is displaced radially outwardly of the adjacent part 41 of the wall of the impeller 3 by an amount 42, and is at an angle α to the part 41, thus producing the required region free from vortex flow. The arrangement facilitates filling of the coupling at high slip, and in order to increase this effect further the filling duct may be inclined at an acute angle to the part 41 of the impeller.