Piezoelectric micro-mixer

The invention relates to the field of micro-mechanics for microfluid pumping and mixing, and in particular relates to a piezoelectric valveless micro-mixer, which comprises two inlet channels, an inlet buffer chamber, an inlet vortex tube, pump chambers, a piezoelectric vibrator, an upper substrate, a pump body, an outlet vortex tube, an outlet buffer chamber and an outlet channel. The two inlet channels are intersected at the inlet buffer chamber, the included angle of central lines of the two inlet channels is less than or equal to 90 degrees, and the vortex tubes are produced by adding triangular bodies in diffusion tubes. The piezoelectric micro-mixer provided by the invention has the main advantages that the two inlet channels are intersected at the inlet buffer chamber, so that fluids to be mixed are firstly mixed in the inlet buffer chamber, and then are further mixed in the specially designed vortex tubes effectively, so that the required mixing time is greatly shortened, and the mixing efficiency is