Patent GB-284124-A (GB)
Title: Improvements in or relating to turbines
IPC: F01D1/28
Filed: 1927-05-10
Abstract: 284,124. Bonom, A. May 10, 1927. Oppositely - running rotor type; balancing moving parts; rotors; driving and transmission mechanism, special applications of; reversing.- Radial flow turbines with oppositely running rotors comprise a number of stages arranged concentrically so that the motive fluid is directly delivered from one stage to another without employing pipes. In the form shown in Fig. 1, the inner rotor has a hub 2 keyed to the shaft 1 and having a blade carrier 4 for the high pressure stage A and a flexible extension 6 supporting the blade carrier 9 of the low pressure stages B1, B2. The carrier 9 is formed by shrinking the annular disc 8 on the part 7. The outer rotor comprises a sleeve 10 with a blade carrier 11 for the high pressure stage A. connected with the part 15 to support the blade carriers 13, 14 for the low pressure stages B1, B2. Rods 21 are placed at intervals on the periphery of the carriers 13, 14 of the rotor for strengthening. They are preferferably of rhomboidal cross section and have a tenon-and-notch engagement with the rotor, with filling pieces 25 inserted. The sleeve 10 carries a series of openings 26 from the inlet pipe 27 to the admission chamber 19. End thrust is balanced in the chamber 17, 20, separated by flanges fitted with labyrinth packing. The lower chamber may be provided with a filling piece so that a prompt balance is set up when starting. The rotors are connected at one end in known manner by the differential gearing 33 and carry at their other end fixed members 34, 35 respectively, with a dog clutch 36 secured to the propeller shaft 37, for reversing. Labyrinth packings 32 are provided at places where leakage may occur. Several sections of each stage may be employed. Fig. 5 shows a high-power turbine with the high pressure stage in two sections A1, A2, and intermediate stage in four sections M1 - - M4 and a low pressure stage in eight sections B1 - -B8. The inner rotor.comprises a hub carrying the blade supports 102, 102<1>, 103, 103<1> for the intermediate stage and the blade supports 109, 109<1> for the high pressure stage. The blade supports 102, 102' have extensions 104, 104<1> carrying the blade supports 105, 105<1> for the low pressure sections B1, B2 and B3' B4, while the blade supports 103, 103' have extensions to carry the blade supports 108, 108<1> for the pressure stages B3 - - B6. The outer rotor comprises the sleeve 111, 111<1> with the high pressure blade carriers 110, 110<1>, the intermediate blade carriers 114, 114<1>, 117 and the low pressure blade'carriers 115, 118, 118<1> and 117. The low pressure blade carriers including the carrier 117 are carried by the struts 116. The turbine is symmetrical about the carrier 117 and has two inlet pipes 100, the carrier rotating about the hub of the inner rotor. The rotors may drive independent machines. The outer rotor shaft is coupled to the driven shaft by a coupling formed of two cups 42 with a number of inclined holes. 44 to set up a strong cooling air current in the cavity formed by the cups. In this form the pressure on each side of the members 114, 114<1> is sufficient to balance end thrust without additional balancing devices. The thin connecting flanges 113, 106, 107 between the blade carriers of higher pressure units and units of lower pressure render the parts self-adjustable under the action of centrifugal force, and their thin section helps to resist transmission of heat.