GB673062A - Improvements in guiding means for annular flow of fluids - Google Patents

Abstract

673,062. Hydraulic turbines; radial-flow pumps. ABBEY, A. (Soc. Financiere d-Expansion Commerciale et Industrielle Soc. Anon Sfinder). Dec. 31, 1947, No. 34939/47. Classes 110(i) and 110(iii) [Also in Groups XI and XXIX] Annular flow of fluid takes place between two surfaces of revolution and a helical surface which has at least one thread. and is constant in pitch over the range of regulation, at least one of the surfaces having a helical movement with respect to the others with a pitch equal to that of the helical surface, for the purpose of regulating the flow. Fig. 8 shows a Kaplan turbine in which the inlet guide comprises a conical surface 1 and helical surface 3, regulation being effected by a screwing movement of :a control surface 2. In the turbine shown in Fig. 9, the control surface 2 is formed by the free surface 29 of the water or other working fluid. The free surface is adjusted by varying the pressure of air within a bell 25. Instead of air, mercury or other plastic liquid or gaseous merium which does not mix or emulsify with the working fluid and is substantially different in density from it may be used. Fig. 10 shows a turbine in which admission is regulated by simultaneous adjustment of members 40 and 41. The flow through the rotor is bounded at its inner periphery by a free surface 45, the position of which is determined by the volume of flow. The flow may be'directed outwardly instead of inwardly as shown. In the turbine (which may be modified to act as a pump) shown in Fig. 6, the working fluid from an annular nozzle 6 passes through rotor passages 9, 10 and is discharged through a pipe 12. Admission is 'varied by admitting pressure water to the space above a cover 24 so as to cause axial displacement of the rotor 17 and thus of a control surface 8 and a control member 11, both of which are carried by the rotor. To avoid impact losses consequent upon alteration of the pressure at the turbine inlet, the positions of a control member 7 with respect to the :surface 8 and of the control member 11 with respect to a surface 14 are automically regulated by the admission of pressure water to chambers 20, 21 and 22, 23 in accordance with the pressure difference set up at the inlet edges 18, 19 of the spiral surfaces of the rotor and charge pipe, respectively. The regulation of the spiral surfaces of the rotor and dismay be effected through a servomotor.