Patent GB-191308493-A (GB)
Title: Improvements in Elastic Fluid Pressure Turbines.
Inventor: BELLUZZO GUISEPPE
IPC: F01D17/14
Filed: 1913-04-10
Granted: 1914-04-09
Abstract: 8493. Belluzzo, G. April 10. Plant; regulating; reversing. -A marine turbine installation of the kind described in Specification 18,771/08 comprises a variable combination of high- and low-pressure turbines which may be arranged in a single group, Fig. 2, or in two separate groups, Fig. 1, on co-axial or parallel shafts. The high-pressure turbine comprises high- and low-pressure forward-motion sections and a combined forward and reverse motion section, and the motive fluid is directed formaximum speed in series through the high- and low-pressure sections direct to the exhaust, and for reduced speed through the high-pressure section, the forward and reverse motion section, and the low-pressure section, and thence direct to the exhaust. The first two high-pressure wheels a, b, Fig. 1, have a larger number of blade rings than the other high-pressure wheels. Similarly, the first wheel h of the low-pressure group is provided with a larger number of blade rings than the remaining low-pressure wheels. For the purpose of running the low-pressure turbine independently. inlet nozzles are provided in front of the wheel h at the top to receive live steam, the expansion being equivalent to that which takes place in the first low-pressure section when working in series with the high-pressure turbines. These nozzles are also used for supplying supplementary steam to the low-pressure turbine. For cruising speed, the various valves are operated so that the wheels a, b, p, q, r, c, d, e, f, g, h, i, l, m are in series. For higher speeds, the wheels a, b, c, d, e, f, g, h, i, l, m are connected in series. For reversing, the steam acts in series on the inner reversely-turned blade surfaces of the wheels r, q, p and on the drum s. Fig. 6 shows the blade and valve arrangement for the wheels p, q, r, the valve 11 controlling the reversing-nozzles d<2>, and the valve 7 controlling the forward nozzles d<1> between the wheels p, q. Valves controlling additional groups of inlet nozzles for high speeds are provided in front of the wheel a and between successive wheels. These valves, together with those for effecting the various combinations indicated above, are controlled by a hand-wheel S, Fig. 10, actuating a sliding cam 10. When moved to the left, the slide 10 successively opens the valves at v<1>, v<2> whereby the steam is admitted first to a group of primary valves 1, 2, 3 and then to a group of secondary valves 4, 5, 6, &c. When the slide is moved to the right, the cam-surface 12 opens the valve at v<3> admitting steam to the reversing-nozzles of the wheel r. The slide 10 also rocks a lever l<1> secured to a shaft a which carries a series of cams c, Fig. 7, operating valves v so that in one position all the valves for forward driving at cruising speed are open, and in another position those for reverse driving are open. The slide 10 may be operated by a hand-controlled steam servomotor. In a modification, the wheels p, q, r are mounted in front instead of at the rear of the high-pressure turbines.