Blade lock and process for manufacturing a blade lock
AssigneeMan Turbomaschinen AG GHH Borsig
InventorAchim Zimmermamm
Life of this patent
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Abstract
The blades (3) of a turbine of axial design are inserted into an undercut blade groove (2) of the turbine rotor (1) in a positive-locking manner and are secured by a blade lock. The blade lock comprises a mounting space (7), which is in connection with the blade groove (2) and into which a filler piece (8), which is in positive-locking relationship with the blade foot (6) of the blades (3), and a wedge (9) are inserted. The cross section of the mounting space (7) receiving the filler piece (8) is widened conically beginning from the blade groove (2). The cross section of the filler piece (8) is adapted to the cross section of the mounting space (7).
Claims8
A blade lock for blading an axial design turbine wherein the blades are inserted into an undercut blade groove of a turbine rotor in a positive-locking manner, the blade lock comprising:
- a mounting space in connection with the blade groove;
- a filler piece in positive-locking relationship with a blade foot of at least one of the blades;
- a wedge inserted into said mounting space, said mounting space having a cross section receiving the filler piece that is conically widened beginning from the blade groove, said filler piece having a cross section adapted to said cross section of said mounting space.
A process for manufacturing a blade lock for blading an axial design turbine wherein the blades are inserted into an undercut blade groove of a turbine rotor in a positive-locking manner, the blade lock including a mounting space in connection with the blade groove, a filler piece in positive-locking relationship with a blade foot of at least one of the blades and a wedge inserted into the mounting space, the mounting space having a cross section receiving the filler piece that is conically widened beginning from the blade groove, the filler piece having a cross section adapted to the cross section of the mounting space, the process comprising the steps of:
- preparing the blade groove by turning;
- subsequent to said step of preparing the blade groove by turning, inserting the filler piece, which has been prepared except for the blade groove contour, into the prepared mounting space;
- fixing the filler piece with the wedge;
- milling the blade groove contour in the blade groove and at the same time milling the blade groove contour in the filler piece;
- removing the filler piece and the wedge from the mounting space;
- and
- equipping the turbine rotor with the blades and securing the blades in the blade groove by the blade lock.
Dependencies are inferred from the claim text.