Ventilation cap, ventilation system and wind generating set

Abstract

The utility model provides a ventilation cap, a ventilation system and a wind generating set, a hub is provided with a ventilation opening, the ventilation cap is used for being installed at the ventilation opening, the ventilation cap comprises an end cover and a cap body, the cap body is provided with ventilation holes, the end cover is arranged at the top end of the cap body, an opening is formed in the bottom end of the cap body, and the ventilation opening is communicated with the ventilation opening. An opening is formed in the inner wall of the end cover and used for covering the ventilation opening, the end cover comprises a central convex part, the central convex part occupies at least one part of the end cover and is arranged to be gradually away from the opening from the center of the end cover to the circumferential edge, and the central convex part is arranged on the inner wall of the end cover so that airflow can be directionally guided. The air flow can smoothly turn from the center of the central convex part to the edge and flow towards the ventilation holes of the cap body, so that the generation of turbulent flow in the cap body is reduced, and the wind resistance is reduced.

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