초록 ▼

A turbine rotor disassembly, handling and reassembly apparatus employs a feedback-controlled electric heating oven to rapidly heat a turbine wheel while the rotor shaft is in the horizontal position. An adapter interfaces the wheel to a handling spool whose outboard end is adjusted to slide on the r

A turbine rotor disassembly, handling and reassembly apparatus employs a feedback-controlled electric heating oven to rapidly heat a turbine wheel while the rotor shaft is in the horizontal position. An adapter interfaces the wheel to a handling spool whose outboard end is adjusted to slide on the rotor shaft and to provide a fulcrum for supporting the wheel. A handling trolley includes a soft hydraulic system for supporting the weight of the wheel to avoid damaging the precision machined surfaces of the shrink-fit area while the wheel is being withdrawn. The handling apparatus also provides means for upending, or rotating, the removed wheel through 90 degrees to place its axis vertical for facilitating handling. A sensor system senses a radial motion of the wheel to detect clearance and to establish an appropriate fluid pressure to just balance the weight of the wheel and attached parts. The handling system includes means for rotating the wheel slightly during reassembly to align keyways or the like. A technique is included for equalizing shaft heating during reassembly of a turbine rotor by cyclically elevating and lowering the wheel, by orbiting the wheel about the shaft or by holding the wheel in the center of its clearance about the shaft until a shrink fit is established.

대표청구항 ▼

A method for radially centering a wheel on a shaft along at least one radial axis comprising the steps of: radially displacing said wheel along said radial axis to a first position of contact between said wheel and said shaft; radially displacing said wheel along said radial axis to a second positio

A method for radially centering a wheel on a shaft along at least one radial axis comprising the steps of: radially displacing said wheel along said radial axis to a first position of contact between said wheel and said shaft; radially displacing said wheel along said radial axis to a second position of contact between said wheel and said shaft, said second position being angularly spaced 180 degrees from said first position; and radially displacing said wheel along said radial axis to a third position substantially midway between said first and second positions whereby said wheel is radially centered on said shaft along said radial axis. A method for equalizing heating of a shaft during shrink-on of a heated wheel upon said shaft comprising: cyclically displacing said wheel along at least a first radial axis of said shaft between a first position of contact therebetween and a second position of contact therebetween, said first and second positions being angularly displaced 180 degrees apart; and cyclically maintaining contact in said first and second positions for relative times effective to equalize said heating of said shaft at least at said first and second positions. Apparatus for radially centering a wheel in a clearance on a shaft comprising: indicating means affixed to one of said wheel and said shaft for indicating a displacement along at least one axis of the other thereof; means for radially displacing said wheel along said at least one axis with respect to said shaft from a first tangential contact at which said indicating means provides a first indication to a second tangential contact angularly spaced apart 180 degrees from said first tangential at which said indicating means provides a second indication contact; said means for radially displacing including means for radially displacing said wheel to a radial position intermediate said first and second radial positions wherein said indicating means provides a third indication intermediate said first and second indications. Apparatus for equalizing heating of a shaft during shrink-on of a heated wheel upon said shaft comprising: means for cyclically displacing said wheel along at least a first radial axis of said shaft between a first position of contact therebetween and a second position of contact therebetween, said first and second positions being angularly displaced 180 degrees apart; and means for cyclically maintaining contact in said first and second positions for relative times effective to equalize said heating of said shaft at least at said first and second positions.