PROCEDURE FOR ASSEMBLY OF MULTITUDE OF TURBINE WHEEL BLADES (VERSIONS) AND ALSO UNIT OF TURBINE WHEEL AND BLADES Russian patent published in 2010 - IPC F01D5/22 

FIELD: machine building.

SUBSTANCE: procedure for assembly of multitude of blades on turbine wheel consists in preliminary twisting band and aerodynamic profile of each blade in response to tangential assembly force applied to tight fit contact surfaces of bands. Thereby rotary set off is transmitted to aerodynamic profile facilitating successive turn of aerodynamic profile into a final unit with edges of neighbour blades bought in contact one with another and with surfaces of dove tail of neighbour blades into contact one with another. In another version of assembly of multitude of turbine wheel blades there is made a lug on the band of each blade whereupon a removable clamp is secured on each lug of the band of each blade. The clamp and lug of corresponding neighbour blades have mainly complementary surfaces inclined at acute angle relative to tangential direction. Further, for preliminary twisting the band and aerodynamic profile of the blade there is wedged the clamp on the band of each blade positioned opposite to inclined surface of the lug on the band of the neighbour blade, which preliminary has been installed on the rim of the turbine wheel. Another invention of the group refers to a unit of turbine wheel and blades consisting of multitude of blades, of the lug positioned on the band of each blade, and of the removable clamp secured to each lug and equipped with a projecting part in tangential direction overlapping a part of the preliminary assembled lug of the turbine wheel blade. Neighbour bands have tightly fit contact surfaces. At least one lug and projecting part of the clamp have inclined surface in contact with another lug and projecting part of the clamp for preliminary twisting the assembled band and aerodynamic profile.

EFFECT: ensuring contract of bands of blades in all phases of turbine operation, also reducing tangential force applied at assembly of blades on turbine wheel.

10 cl, 8 dwg