Patent GB-868117-A (GB)
Title: Improvements in turbines for well or similar drilling or sub-surface work
IPC: E21B4/02
Filed: 1956-08-16
Abstract: 868,117. Hydraulic turbines. TIRASPOLSKY, W. Aug. 12, 1957 [Aug. 16, 1956], No. 25122/56. Class 110 (3). [Also in Group XXXIV] In a turbine for use in a well-boring plant in which the rotor and stator each comprise an axial assembly of separate elements, a braking device is provided at at least one suitable point of the stacks of stationary and rotary parts whereby in the event of the maximum permissible axial wear being attained, the turbine is brought to rest. In Fig. 1 the rotor elements such as 2, 3 are mounted on a shaft 1 and stator elements are mounted within the casing 9. A pair of members 4, 5 having frusto-conical surfaces are keyed to the shaft 1 between two of the rotor elements 2, 3, and a member 8 having a pair of corresponding frusto-conical faces is mounted within the casing 9 between two of the stator elements. Liners 6, 7 of friction material are mounted on the frusto-conical faces of the member 8 and the member 8 is provided with ducts 10 for the flow of the turbine working fluid. Should the permissible axial wear in either direction be attained, the braking surface 6 or 7 engages the corresponding face of the element 4 or 5 and the rotor is brought to rest. In a second embodiment, Fig. 2, similar to Fig. 1, the braking surfaces 6, 7 are secured to elements 13, 14 having frusto-conical surfaces corresponding to those of the rotor elements 4, 5, the elements 13, 14 being secured.by welding 16, 17 to the inner surface of the stator element 8. The rotor elements 4, 5 are formed at their peripheries with cutting edges 20, 21 which are disposed opposite the welds 16, 17. As the limit of axial wear is approached (in either direction), the weld 16 or 17 is cut by the cutter 20 or 21, the part 13 or 14 finally being separated from the stator element 8 and then urged into contact with the rotor element 4 or 5 by means of the spring 15. The rotor is thus brought to rest. In Fig. 3, a sleeve 22 is secured to the rotor shaft, a nut 24 being screwed to the upper end of the sleeve and a ring member 26 having dogs 31 on its lower face being in splined connection 27 with the sleeve. A spring member 29 is disposed between the nut 24 and the ring member 26 and the ring 26 is normally held in its upper position against the compressed spring 29 by means of a thin ring member 30. Stator elements 32 having frusto-conical surfaces 33 lined with friction material are secured within the casing 9, and a pair of elements 37 having corresponding frusto-conical surfaces and dogs 38 at their outer ends are held in contact with the surfaces 33 by means of a spring device 36. Ring members 39 having abrasive elements 40 are secured to the stator elements 32 adjacent the ring members 30. Should the limit of permissible axial wear in either direction be attained, the ring member 30 will be cut through by the abrasive element 40. The ring member 26 will be released and forced by the spring 29 so that the dogs 31, 38 engage and the rotor will be brought to rest by engagement of the element 37 with the friction surface 33.