Vibrating membrane fluid circulator

A membrane fluid circulator comprising an internal hydraulic circuit made up in succession of an admission orifice, a pump body and a delivery orifice, the pump body having two rigid walls defining there between a pumping chamber for the fluid extending from said admission orifice to said delivery orifice with a deformable membrane located in said pumping chamber and having two external surfaces facing respectively said walls, at least one of said membrane surfaces and at least one of said walls defining in said pumping chamber a circulation space for the fluid, said deformable membrane being maintained under a tension parallel to the fluid circulation direction from said admission orifice to said delivery orifice, said membrane having one edge located near said admission orifice and provided with means for coupling to motor means for generating a periodic excitation force substantially normal to the external faces of said membrane, said circulation space having a cross section perpendicular to the circulation fluid direction which has a size measured along the periodic force direction progressively decreasing from said admission orifice to said delivery orifice.