Differential pressure flow sensor for ventilators with improved flow resistance with multi-part flap

摘要

A differential pressure flow sensor (44) comprises a sensor housing (46) which defines a flow channel (52) passing through the sensor housing (46), through which fluid can flow through a flow path (S), - a flow resistance arrangement (72; 72 '; 72 ") arranged in the flow channel (52) and axially on both sides of the flow resistance arrangement (72; 72 '; 72") Druckfassungsformationen (56a, 58a), wherein the flow resistance arrangement (72) comprises: - a fixed outside of the flow channel (52) Festlegeabschnitt ( 72a) formed to define the drag assembly (72) on the sensor housing (46) and a plurality of relatively movable flap disposed within the flow channel (52) which are movable relative to the securement portion between an unloaded rest position and one by Aussere force due to fluid flow along the flow path (S) deflected deflection According to the invention, it is provided that the fixing section (72a) surrounds the flow channel (52) in the circumferential direction about the flow path (S) by not more than 280 °.