Variable-angle vortex generator

A variable-angle vortex generator, installed in an intake pipe (100) of an internal combustion engine, comprising:

• a shaft seat (1);
• a plurality of vanes (2), radially arranged with an interval apart from each other, and pivotally coupled to the shaft seat (1), and each vane (2) has a movable end (21) protruding from an edge of the vane (2) and an axle penetrating therein to be fixed to the shaft seat (1), the vane (2) being rotatable along the axle to do a swing movement so that each vane (2) inclines to form a gap between any adjacent two vanes (2) and has a first position and a second position when the plurality of vanes (2) not being pushed and pushed by a fluid, respectively, wherein an axial direction of the axle is not parallel to the fluid direction;
• and
• a position restoring mechanism (3), including a synchronizing element (31) where the movable end (21) being rotatably disposed therein,
• thereby when the fluid enters into the intake pipe (100), each vane (2) is pushed by the fluid to produce the swing movement along the axle to change to the second position, so that the fluid flows along an inclined angle of each vane (2) and through the gap between any two adjacent vanes (2) to generate a vortex, and when the plurality of vanes are not pushed by the fluid, each vane is pushed back to the first position by an elastic force of the position restoring mechanism (3).