Sha bainiushi windmill that has hole of opening and shutting on bent plate

The utility model relates to a sha bainiushi windmill that has hole of opening and shutting on bent plate, sha bainiushi (savonius) windmill application changes its blade angle in order improving its torque and rotational speed, but its all very complicated and difficult preparation of mechanism that changes blade angle, the utility model discloses the cut off goes out the more than one hole on the bent plate of blade, and before the concave surface in hole, while being fixed in around the hole of elastic plate, the elastic plate remaining trilaterally can freely use the fixed limit to do fan -shaped swing as the center, and the size of elastic plate slightly is greater than the hole, can be with the whole cover in hole, when the sha bainiushi windmill facingd the wind, the elastic plate on the concave surface blade was before the hole, and wind can make the elastic plate near the blade, makes the hole covered totally by the elastic plate, elastic plate on the convex surface bent plate is after the hole, and the wind pressure can make the elastic plate perk, makes the elastic plate can't cover the hole completely, so partly wind can be passed through by the hole, and the air molecule that impactes protruding bent plate will reduce, and aerodynamic drag reduces, the torque and the rotational speed of multiplicable windmill.