Patent attributes
A piezoelectric blower includes a valve unit, a pump unit, a controller, and an outer housing. The valve unit includes a plurality of ejection holes and film holes. The pump unit includes a plurality of communication holes and suction holes. The outer housing covers the valve unit and the pump unit with a gap between the outer housing and each of the valve unit and the pump unit. Thus, the outer housing forms vent passages between the outer housing and the valve unit and between the outer housing and the pump unit. The inlet communicates with the vent passage. The outlet communicates with the vent passage. At least one of the inlet and the outlet is displaced from a central axis of the pump chamber. The ejection holes, the film holes, the communication holes, and the suction holes are symmetric about the central axis of the pump chamber.
