The invention discloses a valveless
piezoelectric pump of an elliptical combined
pipe, comprising a pump body, a pump cover and a piezoelectric vibrator, wherein the pump body is provided with an
inlet flow pipe, an outlet flow
pipe and a pump cavity; the
inlet flow pipe and the outlet flow pipe have same structure and are coaxially arranged and
equidistant from the center of the pump cavity; the
inlet flow pipe and the outlet flow pipe respectively consist of a flow collecting conical pipe and two flow dividing elliptical pipes which are respectively communicated with the large end of the flow collecting conical pipe; the contour lines of the two flow dividing elliptical pipes are respectively formed by two coaxial elliptical line segments which have two coincided long and short axes and are different in length; the short half axis of the large
ellipse is 450 mu m, and the long half axis thereof is 1200 mu m and is vertical to the
central line of the flow collecting conical pipe; the starting point of the small elliptical
line segment is positioned at the
tail end of the large end surface of the flow collecting conical pipe, and the difference of the long half axes of the small
ellipse is equal to the difference of the short half axes thereof; and the large
ellipse is tangential to the
central line of the flow collecting conical pipe, and the wrap angles of the two flow dividing elliptical pipes are respectively 60 degrees. The valveless
piezoelectric pump has the advantages of small size, high flow resistance coefficient, good
cavitation performance, no damage to the conveyed medium, capability of preventing
electromagnetic interference and easier control of flow rate.