Fan module and electronic device

An electronic device, comprising:

• a casing, having an assembly space and a vent hole connected to the assembly space;
• and
• a fan module, assembled in the assembly space, comprising:
• a blade mechanism, comprising a frame, a positioning bracket, and a plurality of blades, wherein the positioning bracket is movably connected to the frame, the blades are movably connected to the positioning bracket and the frame, and the frame has a through hole aligned with the vent hole;
• a switch component, connected to the positioning bracket;
• and
• a fan, detachably disposed at one side of the through hole, and the positioning bracket and the blades being located at another side of the through hole, wherein the switch component is located on an assembly path of the fan and the fan is detachably disposed between the vent hole and the through hole,
• in a first mode, any two of the blades adjacent to each other are stacked with each other to close the through hole, and
• in a second mode, the fan pushes the switch component to drive the positioning bracket to drive the blades, such that the blades have a rotational degree of freedom relative to the positioning bracket or the blades rotate relative to the frame to open the through hole.