Piezoelectric fan, radiator and electronic equipment

The utility model provides a piezoelectric fan, a radiator and an electronic device, the piezoelectric fan comprises a blast cavity, the volume of the blast cavity is changed under the driving of piezoelectric ceramics, and the blast cavity is communicated with the outside of the blast cavity through a flow channel; when excitation is applied to the piezoelectric ceramic, the volume of the blast cavity changes along with vibration of the piezoelectric ceramic, and gas is forced to flow in and out of the flow channel to achieve air-cooled heat dissipation. According to the piezoelectric fan, air outside the flow channel is driven to flow through volume change of the air blowing cavity with the flow channel, and local rapid air cooling heat dissipation of the IGBT device is achieved. Compared with the prior art, as a cantilever type fan blade does not need to be used, blast driving is realized by directly utilizing the flexible cavity wall of the blast cavity, the structure is simple and reliable, the size is s