Blade retention at a compressor rectifier stage for impact resistance

摘要

A rectifier stage of an axial turbine engine compressor is placed directly downstream of the input blower of a turbo-reactor or turboshaft engine compressor. The blade roots of the rectifier stage are housed inside the inner shroud by insertion into respective slots. The blade roots include at least one opening protruding from the slot of the shroud, so as to receive a spiral ring having at least two loops so as to prevent the blade roots from escaping from the respective slots of the inner shroud, and so as to form a connection between the blade roots. A method for retaining blades of a rectifier stage of an axial turbine engine compressor on an inner shroud, in particular a rectifier stage placed directly downstream of the input blower of a turbo-reactor or turboshaft engine compressor, includes positioning a spiral ring having at least two loops inside the openings of the blade roots by threading one end of the ring successively into the openings until all of the spirals of the ring are housed inside the openings.

主权项

1. A rectifier stage of an axial turbine engine compressor, comprising:
an outer shroud and an inner shroud, both being concentric; a series of blades arranged radially and fastened at tips thereof to the outer shroud; a series of cutouts arranged about the inner shroud, each cutout being configured such that a root of a corresponding blade protrudes through the inner shroud from the outer side of the inner shroud to the inner side of the inner shroud; at least one opening located at the root of each blade, each opening being on the inner side of the inner shroud; and a spiral ring having at least one overlapping loop, the spiral ring passing through the openings of each blade so as to prevent the root of each blade from escaping from the respective cutout of the inner shroud, and so as to form a connection between the blade roots; and wherein the diameter of the ring when non-operational is slightly smaller than the diameter of the virtual circle going passing through the openings, such that the ring is tensioned when in place and pulls all the blades equally towards a middle of the inner shroud.