Rotary machine comprising a rotor placed in a fluid and equipped with orientable blades
A fluidic rotor rotary machine has a rotor comprising at least one blade ( 4 ) mounted on an arm ( 2 ) rotating about a main axis ( 1 ) of the rotor, the rotor being held by a support structure ( 5 ) in an orientation such that said axis ( 1 ) is essentially perpendicular to the fluid flow direction, the blade ( 4 ) being pivotally mounted about a rotational axis ( 3 ) parallel to the main axis ( 1 ), the machine being characterized in that it comprises means for generating a relative rotational movement of the blade ( 4 ) relative to the arm ( 2 ) at the rotational axis ( 3 ), thereby varying the blade angle, said means comprising an eccentric mechanism rotating on said blade rotational axis. Application in particular to propellers and generators operating according to Lipp-type or Voith-Schneider-type kinematics, with possible mode switching.
1. A fluidic rotor rotary machine, the rotor comprising at least one blade ( 4 ) mounted on an arm rotating about a main axis of the rotor, the rotor being held by a support structure in an orientation such that said axis is essentially perpendicular to the fluid flow direction, the blade being pivotally mounted about a rotational axis parallel to the main axis, the machine further comprising a device for generating a relative rotational movement of the blade relative to the arm at the rotational axis, thereby varying the blade angle, said device for generating a relative rotational movement of the blade relative to the arm comprising:
an eccentric mechanism rotating on said blade rotational axis, said eccentric mechanism comprising an eccentric member and a transfer member connected to the blade,
a mechanical transmission device for synchronizing the rotational movement of said eccentric member with the rotation of the rotor about the main axis and adapted to keep the eccentric member in the same orientation irrespective of the angular position of the rotor, to thereby provide a Lipp-type kinematics.
2. A machine according to claim 1 , wherein the transfer member rotates about a pivot shifted relative to the rotational axis, one end of said transfer member being connected to the blade and the other end being connected to a crankshaft.
3. A machine according to claim 2 , wherein the crankshaft is mounted on a shaft defining the rotational axis and mounted on the arm.
4. A machine according to claim 1 , further comprising a device for varying the maximum pitch angle of the blade(s) as a function of the fluid flow velocity.
5. A machine according to claim 4 , wherein said device for varying the maximum pitch angle of the blades comprises members for the self-modification of the geometry of the control between the eccentric mechanism and the blade.
6. A machine according to claim 4 , wherein said device for varying the maximum pitch angle of the blade(s) comprises members for adjusting the control geometry between the eccentric mechanism and the blade.
7. A machine according to claim 1 , wherein the constant orientation of the eccentric member is obtained by a one-to-one ratio angular transmission between a member rotating with the arm and a member rotating with the eccentric member.
8. A fluidic rotor rotary machine, the rotor comprising a plurality of blades mounted on respective arms rotating about a main axis of the rotor, the rotor being held by a support structure in an orientation such that said axis is essentially perpendicular to the fluid flow direction, each blade being pivotally mounted about a rotational axis parallel to the main axis, the machine further comprising a plurality of devices for generating a relative rotational movement of a respective blade relative to a respective arm at the respective rotational axis, thereby varying the blade angle, each device for generating a relative rotational movement of the blade relative to the arm comprising:
an eccentric mechanism rotating on said blade rotational axis, said eccentric mechanism comprising an eccentric member and a transfer member connected to the blade,
a mechanical transmission device for synchronizing the rotational movement of said eccentric member with the rotation of the rotor about the main axis and adapted to keep the eccentric member in the same orientation irrespective of the angular position of the rotor, to thereby provide a Lipp-type kinematics.
9. A machine according to claim 8 , wherein the constant orientation of the eccentric member is obtained by a plurality of one-to-one ratio angular transmissions between a member rotating with the arms and a member rotating with the respective eccentric member.