Wind turbine comprising a rotor having a hub carrying one or more blades, an air intake and a nacelle, the hub being rotatably mounted on a frame and the frame extending forward into the hub, wherein an air flow passage is provided between an inside portion of the hub and the nacelle via at least one first opening to the hub.
1. A wind turbine comprising a rotor having a hub carrying at least one blade, the hub being rotatably mounted on a frame and the frame extending forward into the hub, wherein the wind turbine further comprises
a nacelle,
a generator within the nacelle,
the frame extending into the nacelle, and the generator arranged around the frame,
a tower, and
an air intake arranged in the nacelle or in the tower,
wherein
an air flow passage is provided between an inside portion of the hub and the nacelle through the frame and via at least one first opening to the hub,
the hub houses a pitch motor for the at least one blade,
an air conditioning system is arranged in the nacelle or in the tower, and
an external wall of the hub is provided with a one way air outlet that prevents external air from entering the hub and defines an opening in the hub for air from the flow passage to exhaust to ambient air wherein the air outlet is an air damper, one way valve, a safety valve or an overpressure damper.
2. The wind turbine according to claim 1 , further comprising a rotor shaft operatively coupled with the hub, wherein the rotor shaft is arranged, at least partially inside the frame.
3. The wind turbine according to claim 2 , wherein the rotor shaft is connected to a front part of the hub via a coupling element.
4. The wind turbine according to claim 1 , wherein the first opening to the hub is arranged in a portion of the frame extending forward into the hub.
5. The wind turbine according to claim 3 , wherein the first opening to the hub is arranged in a front portion of the external wall of the hub, the front portion being enclosed inside a spinner of the wind turbine and the coupling element comprises at least one opening to the spinner.
6. The wind turbine according to claim 2 , wherein the first opening to the hub is arranged in a front portion of the external wall of the hub, the front portion being enclosed inside a spinner of the wind turbine and the rotor shaft comprises an air flow passage therethrough.
7. The wind turbine according to claim 1 , wherein the first opening to the hub is arranged in a portion of the frame extending forward into the hub.
8. The wind turbine according to claim 7 , wherein a distal end of the portion of the frame extending forward into the huh comprises a partition.
9. The wind turbine according to claim 1 , wherein the first opening to the hub is arranged in a front portion of the external wall of the hub, the front portion being enclosed inside a spinner of the wind turbine and a distal end of the frame extending forward into the hub is open.
10. The wind turbine according to claim 4 , wherein the first opening provided in the portion of the frame extending forward into the hub is arranged beyond substantially half of the diameter of the hub.
11. The wind turbine according to claim 7 , wherein the first opening to the hub is large enough so that the hub is accessible to an adult human.
12. The wind turbine according to claim 1 , wherein the air intake is arranged in the external wall of the hub.
13. The wind turbine according to claim 1 , wherein the first opening to the hub is provided with a fan.