GB140004A - Improvements in hydraulic turbines - Google Patents

Abstract

140,004. Taylor, H. B. Aug. 18, 1919. Combined-flow type; casings; working-fluid supply.-An inward-flow hydraulic turbine comprises a rotor 31, Fig. 1, surrounded by a volute inlet chamber 39 formed in the concrete structure 37. The rotor is mounted in bearings formed in a cover-plate 35 situated at the lower end of the metal-lined pit 36. The rotor is surrounded bv cast-iron directing-vanes 40, mounted in rings 41, 42. The water on leaving the rotor blades drops on to a cone 46 and passes through diffusion vanes 49 to a volute exhaust chamber 48. The vanes 49 are mounted in rings 50, 51. The vanes 40, 49 and rings 41, 42, 50, 51 act as supports for the concrete structure 37 and the rotor 31. Adjustable guide-vanes 44 are pivotally mounted in the head-cover 35. The rings 50, 51, 41, 42 may be made integrally or built-up in sections. In a modification, the diffusion vanes 52, Fig. 4, are cast integrally with a cone 54 which caps the part 46 of the concrete structure, and are secured at their outer ends to a ring 53. In a further modification, instead of the water being discharged in a single spiral or volute chamber it is gathered in two opposite spiral chambers 55. Fig. 7. In a further modification, the turbine 31 and diffusion vanes 52, Fig. 8, are situated at opposite ends of a flaring draft-tube 56, whilst the discharge chamber 57 is semi-circular instead of volute-shaped. The draft-tube 56 may be metallined. In a further modification, Fig. 17, there are two sets of diffusion vanes 67, 69 leading to two annular chambers 63, 64. The central stayring 71 co-operates with an annular partition 72 carried by the rotor to separate the water into two distinct streams. In a further modification, the chambers 63, 64 are replaced by a single chamber. Specification 123,132 is referred to.