GB944327A - Locking means for turbine or compressor blading - Google Patents

Abstract

944,327. Gibs. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. June 13, 1960 [June 12, 1959], No. 20227/59. Heading F2H. [Also in Division F1] A fir-tree or otherwise undercut slot 6 formed in a turbine &c. rotor 5 has a groove 8 at its radially inner end to receive a blade root 7. A blade-retaining bar 1 has upstanding legs 3 at the ends spaced apart a distance equal to the axial length of the blade root 7, one or both of the legs 3 being shaped so that when the bar is fitted over the inner end of the blade root 7 it can be inserted with the blade root into the slot 6. The bar 1 is then moved circumferentially about the axis of the rotor until one of its sides contacts a side of the groove 8 such that the upstanding legs 3 overlap the rotor 5 adjacent to the slot. A locking bar 10 having one bent end is inserted between the retaining bar 1 and the exposed side of the groove 8 filling the gap 9, and the remaining end of the bar 10 is bent to restrict its axial movement and also circumferential movement of the bar which, by its position, restricts axial movement of the blade root. The legs 3 of the retaining bar 1 may be symmetrical so that the bar may be inserted from either axial end of the disc or moved in either clockwise or anticlockwise direction in the plane of the disc, or alternatively one end 3 need not be profiled but could be left rectangular. The locking bar 10 may comprise two legs spaced apart a distance equal to the spacing of the blade roots and joined together by a yoke, being similar to a locking plate described in Specification 944,326.