초록 ▼

An apparatus for detecting fluid flow by obtaining a differential pressure across an obstruction in a fluid conveying channel. The obstruction is hingably connected to the housing of the channel. The connection is of a width substantially less than the periphery of the channel so as to reduce the co

An apparatus for detecting fluid flow by obtaining a differential pressure across an obstruction in a fluid conveying channel. The obstruction is hingably connected to the housing of the channel. The connection is of a width substantially less than the periphery of the channel so as to reduce the collection of contaminants which decrease the accuracy of the apparatus. Because the orifice defined by the area between the obstruction and the periphery of the channel is variable according to the fluid flow, the pressure differential versus flowrate relationship is different from the square-law relationship of a fixed orifice, and provides a relatively high pressure differential at low flowrates and a relatively low pressure differential at high flowrates.

대표청구항 ▼

An obstruction assembly for a flow sensing apparatus used to measure a fluid flow in a channel, comprising: a secured element outside the channel fixed relative to said flow sensing apparatus; an elastically flexible, substantially planar flow obstruction element configured such that a substantial p

An obstruction assembly for a flow sensing apparatus used to measure a fluid flow in a channel, comprising: a secured element outside the channel fixed relative to said flow sensing apparatus; an elastically flexible, substantially planar flow obstruction element configured such that a substantial portion of the periphery of said obstruction element is disposed proximal to the periphery of said channel when no fluid is flowing through said channel; and a hinge element hingeably connecting said secured element to said obstruction element.