Patent GB-190512928-A (GB)
Title: Improvements in Turbines.
Inventor: GOLDSBOROUGH RICHARD HENRY
Filed: 1905-06-22
Granted: 1906-06-21
Abstract: 12,928. Goldsborough, R. H. June 22. Elastic-fluid turbines.- Consists in means, in steam &c. turbmes, (1) for minimizing the losses which occur during expansion and regeneration of the steam, (2) for governing the steam supply to the turbine, (3) for reinforcing the steam supply in the last stages of expansion, and (4) for reversing. In the form shown in Figs. 1 and 2, a ring of vanes 4 surrounds an annular chamber 5 in the rotor. Admission tubes 6 are adjustably secured to a port ring 8 and conduct steam from the steam chest 9 to the vanes, the steam returning through the vanes again to the exhaust chamber 10. 1 he chamber 5 decreases in size towards the inner part, so that the steam, in flowing inwards, passes to successively-decreasing zones, and, in flowing outwards, passes to successively -increasing zones. These variations in the cross-section of the steam current tend to cause regeneration of the pressure of the entering steam with a resultant useful reaction against the vanes, and to cause additional regeneration in the outflowing current so that it acts upon the vanes by pressure. In a modified form, shown in Fig. 3, a ring of vanes is secured between disks 13, and a hollow receiver 15 is rotatably mounted on a boss 16, and is provided with abutments 17 to direct the steam into the receiver. Suitable means, such as weights 18, are attached co the receiver to resist the turning effort produced by the rotating boss. A port ring has groups of admission ports 20 and exhaust port 22, the latter deflecting the steam into the casing. An annular chamber 21 forms the steam chest. In the duplex form shown in'Fig. 5, two sets of disks 26, 27, 28. 29 are bolted together and carry rings of yanes 32,' 33, 34, &c. Annular chambers 35, 36, 37, 38 are provided in the disks, preferably of greater width than the vanes. Steam is admitted to an annular chamber 66 and passes successively through the sets of vanes to the exhaust passages 56, port rings 40, Fig. 11, being provided having admission and exhaust ports 41, 42 respectively. For reversing, separate wheels 50 are carried by the shaft, and are provided with vanes 51, 52, fixed vanes 53 being placed between them. A port ring having a series of admission ports directs steam from the steam chests 67 to the vanes. For governing, a ring 57 surrounds the port ring 40 of the first set of vanes, and has an aperture 58 for each group of admission ports 41 ; the rear wall 59 of each aperture has an inclination substantially similar to the ports 41, and the front wall is radial. Similar governing-devices may be fitted to the reversing-wheels. The governing- ring is operated by means of a rack and pinion. The admission-valve is shown separately in Fig. 8. It consists of a hollow body rotated by means of a crank 71, Fig. 5, and provided with an inlet port 72 extending through about 100 degrees, and with two diametrically-opposite outlet ports 74. In the position shown in Fig. 8, steam passes to the pipe 75 leading to the steam chest 66 for forward running ; to reverse, the valve is turned through ninety degrees ; this brings the ports 74 opposite the pipes leading to the annular chamber 67. A method of moving the governing-ring automatically is shown in Figs. 15 and 17. A screw 87 engages partial screw-threads 86 on the ring, and carrier a friction wheel 90 arranged to engage either of two wheels 92, 93 on a longitudinallymovable shaft 94 controlled by the governor balls 100. The shaft 95 is driven from the main turbine shaft. In the form shown in Fig. 18, two additional steam chests 105 are provided, and have apertures to supply reinforcing steam to the annular passages 48. The steam admission to the various steam chests 66, 67, 105 is controlled by a common valve 107, Fig. 19, having a feed-port 114 long enough to keep open the supply pipe 115 to the interior of the valve through its whole movement. Two diametrically-opposite reversing-ports 116 register with the pipes 117 in one extreme position, the port 119 registers with the pipe 120 for forward driving in the position shown, in a third position the port 124 registers with the pipe 120 and two ports 123 register with the pipes 125 leading to the steam chests 105, and in a fourth position the steam supply is entirely cut-off. The reinforcing steam chests may be arranged at any desired point.