초록 ▼

A variable orifice flow sensor includes a flow conduit member defining a flow orifice and fluidly connecting first and second fluid flow ports, a flapper of magnetizable sheet metal that is mounted in the conduit member by a hinge portion so that the flapper angularly deflects out of the plane of th

A variable orifice flow sensor includes a flow conduit member defining a flow orifice and fluidly connecting first and second fluid flow ports, a flapper of magnetizable sheet metal that is mounted in the conduit member by a hinge portion so that the flapper angularly deflects out of the plane of the orifice in response to fluid flow through the conduit member to vary the effective fluid flow cross-sectional area of the orifice in proportion to the flow rate of fluid through the conduit member, and a pressure sensing tap on either side of the flapper. A deflection-limiting surface is provided in the conduit member adjacent the hinge portion. The hinge portion abuts against the deflection-limiting surface when the flapper experiences an angular deflection at least equal to a predefined angle in response to a fluid flow rate that is at least equal to a predetermined value, whereby overstressing of the hinge portion is minimized. In addition, at least one magnet is provided in the conduit member adjacent the flapper, whereby the magnet generates a magnetic field that acts on the flapper so as to force it into a position that tends to minimize the zero flow gap that exists between the flapper and the portion of the conduit member that defines the fluid flow orifice when there is no fluid flow through the orifice.

대표청구항 ▼

[ What is claimed is:] [1.] A variable orifice flow sensor, of the type including a flow conduit member defining a flow orifice and fluidly connecting first and second fluid flow ports, a flapper with a pressure sensing tap on either side thereof, said flapper made of a magnetizable metal and mounte

[ What is claimed is:] [1.] A variable orifice flow sensor, of the type including a flow conduit member defining a flow orifice and fluidly connecting first and second fluid flow ports, a flapper with a pressure sensing tap on either side thereof, said flapper made of a magnetizable metal and mounted in the conduit member by a hinge portion so that the flapper angularly deflects out of the plane of the orifice in response to fluid flow through the conduit member to vary the effective fluid flow cross-sectional area of the orifice in proportion to the flow rate of fluid through the conduit member, and wherein a zero flow gap is defined between the flapper and the conduit member when there is no fluid flow through the orifice, wherein the improvement comprises:a) a deflection-limiting surface in the conduit member adjacent the hinge portion against which the hinge portion abuts when the flapper experiences an angular deflection at least equal to a predefined angle in response to a fluid flow rate that is at least equal to a predetermined value; andb) a magnetic element in the conduit member adjacent the flapper, the magnetic element being located and configured so as to generate a magnetic field that forces the flapper into a position that tends to minimize the zero flow gap.