Turbine blade retainer
US4778342A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 17, 1986 |
| Grant date | Oct 18, 1988 |
| Priority date | — |
| Expiry date | Oct 17, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01D5/323
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Two-part turbine-blade retainer structures are disclosed for axial retention of each of a plurality of turbine blades to a rotor wheel, wherein radial retention is via fir-tree engagement of individual blade roots to the wheel. In a preferred embodiment, a male or bolt element of the retainer has a shank which is characterized by a smoothly cylindrical portion adjacent at one end to one of the heads; this cylindrical portion terminates at a shoulder, beyond which the shank is reduced and externally threaded. A sleeve or nut element of the retainer has an elongate threaded bore and is characterized by an outer cylindrical surface which extends to the second head. The two elements are proportioned to be inserted through opposite ends of a passageway and to be screwed together into firm engagement at the shoulder (i.e., at a location intermediate the two heads), with the sleeve covering the threads of the male element and the heads preventing the turbine blade from axial motion with respect to the wheel. A single weldment at one end secures final assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.