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US 8,974,175 B2Granted
Turbomachine compressor
AssigneeSnecma
InventorsOlivier Stephane Domercq, Vincent Paul Gabriel Perrot
Life of this patent
Estimating the term…
Abstract
A turbomachine compressor including variable-pitch vanes including an aerofoil section connected by a mounting plate of circular outline to a pivot guided in rotation in an orifice in a casing is disclosed. The mounting plate of the vane includes at least one notch for bleeding air from the compressor stream. The notch is intended to communicate with a hole in the casing in order to remove the air bled off when the vanes are in a first position, and to be closed off by this casing when the vanes are in a second position, so that the flow rate of bled air depends on the pitch angle of the vanes.
Claims14
A turbomachine compressor, comprising:
- an annular casing;
- an air duct;
- and
- at least one stator stage formed by an annular row of variable-pitch blades disposed into said air duct, each blade having an airfoil section connected at at least one end to a radial cylindrical pivot by a mounting plate having an approximately circular contour, said radial cylindrical pivot being guided in rotation in an orifice in the annular casing, each blade being rotatable about an axis defined by the pivot of the blade between a first position and a second position,
- wherein the mounting plates of at least some of the blades each have an orifice for bleeding air out of the air duct of the compressor, the orifices, which directly communicate with the air duct of the compressor, with no passage for said air through the blades, communicating with holes which are formed through the casing and which evacuate said bleeding air out of the air duct when the blades are in the first position and being closed off by the casing when the blades are in the second position, such that the air bleed flow rate depends on the pitch angle of the blades.
2 more elements
A turbomachine compressor, comprising:
- an annular radially outer casing;
- an annular radially inner casing;
- an air duct;
- and
- at least one stator stage formed by an annular row of variable-pitch blades disposed into said air duct, each blade having an airfoil section connected:
- at a first end to a radial first cylindrical pivot by a first outer mounting plate having an approximately circular contour, said radial first cylindrical pivot being guided in rotation in a first orifice in the annular radially outer casing, and,
- at a second end to a radial second cylindrical pivot by a second inner mounting plate having an approximately circular contour, said radial second cylindrical pivot being guided in rotation in a second orifice in the annular radially inner casing,
- each blade being rotatable about an axis defined by both the radial first and second cylindrical pivots of the blade between a first position and a second position,
- wherein the second inner mounting plates of at least some of the blades each have an orifice for bleeding air out of the air duct of the compressor, the orifices communicating with holes formed through the annular radially inner casing and evacuating said bleeded air out of the air duct, when the blades are in the first position and being closed off by the annular radially inner casing when the blades are in the second position, such that the air bleed flow rate depends on the pitch angle of the blades.
6 more elements
A turbomachine compressor, comprising:
- an annular casing;
- an air duct;
- and
- at least one stator stage formed by an annular row of variable-pitch blades disposed into said air duct, each blade having an airfoil section connected at at least one end to a radial cylindrical pivot by a mounting plate having an approximately circular contour, said radial cylindrical pivot being guided in rotation in a orifice in the annular casing, each blade being rotatable about an axis defined by the pivot of the blade between a first position and a second position,
- wherein the mounting plates of at least some of the blades each have an orifice for bleeding air out of the air duct of the compressor, the orifices:
- communicating with holes which are formed through the casing and which evacuate therethrough the bleeded air out of the air duct, with no port in the blades for entering said bleeded air into said blades, when the blades are in the first position, and,
- being closed off by the casing when the blades are in the second position, such that the air bleed flow rate depends on the pitch angle of the blades.
4 more elements
Dependencies are inferred from the claim text.