Kaplan-type turbine

A Kaplan-type turbine, comprising a stator part and a rotor part,

• said stator part comprising:
• a conduit configured to convey a water flow towards an impeller having a rotation axis;
• a stator of an electric generator;
• said rotor part comprising:
• an impeller having in turn:
• an ogive with at least three blades having a variable angular setup with respect to an inclination axis (X2) substantially orthogonal to said rotation axis (X1);
• a rotation shaft bearing said impeller;
• adjustment means for adjusting the setup of said blades, defined within said ogive and said rotation shaft;
• a rotor of said electric generator, fixed to said rotation shaft at said stator;
• said means for adjusting the setup of said blades comprising for each blade:
• a load-bearing disc, from which one said blade develops, said load-bearing disc being constrained to rotate on said ogive around said inclination axis (X2);
• a lever, fixed to said load-bearing disc and developing inside said ogive;
• a manoeuvring rod, pivoted at a first end to said lever and at a second opposite end to a drive slider;
• said means for adjusting the setup of said blades comprising, within said ogive, also:
• a drive slider, to which said second ends of said manoeuvring rods are pivoted;
• an axial translation system for said drive slider, said axial translation system being of the nut and worm screw type, said nut being fixed to said drive slider and said worm screw being coaxially fixed to a drive shaft positioned to operate within said rotation shaft;
• wherein said means for adjusting the setup of said blades also comprise a pneumatic rotation actuator for said drive shaft.