초록 ▼

A flow meter including a variable area obstruction which is mounted in a conduit. Inputs to a differential pressure transducer are positioned in the conduit on opposite sides of the obstruction to measure fluid pressure differential across the obstruction. In one embodiment, a sleeve is secured with

A flow meter including a variable area obstruction which is mounted in a conduit. Inputs to a differential pressure transducer are positioned in the conduit on opposite sides of the obstruction to measure fluid pressure differential across the obstruction. In one embodiment, a sleeve is secured within the conduit thereof substantially separated from the conduit so as to prevent fluid condensation on the sleeve, and to create a dead end pocket between the conduit and the sleeve for collecting liquids from the conduit end preventing them from contacting the obstruction. The variable area obstruction comprises an elastic membrane that includes first, second and third leaves which extend into the flow stream and are compliant to fluid flow so that an increase in flow rate increases the deflection of the leaves and increases the through flow area through the obstruction. The first leaf is secured at a fixed end adjacent a first portion of the interior surface of the conduit and extends in a first direction to a free end preferably positioned adjacent a second portion of the interior surface of the conduit opposite the first portion. The second and third leaves are located adjacent opposite sides of the first leaf and extend from their fixed ends toward their free ends in directions which are generally opposite to the first direction.

대표청구항 ▼

A flow meter comprising: a conduit for communicating fluids therethrough and having a first port positioned at a first location in said conduit and a second port positioned at a second location in said conduit, wherein said first and second ports are adapted for connection to a transducer; an inner

A flow meter comprising: a conduit for communicating fluids therethrough and having a first port positioned at a first location in said conduit and a second port positioned at a second location in said conduit, wherein said first and second ports are adapted for connection to a transducer; an inner conduit surface located within the conduit and substantially insulated from influence of ambient temperature present outside the conduit, wherein said inner conduit surface prevents exposure of the second port form upstream flow and the first port from downstream flow when flow is in one direction and wherein said inner conduit surface prevents exposure of the first port from upstream flow and the second port from downstream flow when flow is in an opposite direction; an obstruction secured within the conduit so that a variable area portion thereof lies within boundaries defined by the inner conduit surface, wherein fluid flow area through said variable area portion increases and decreases in response to corresponding increases and decreases in flow rates of fluid passing therethrough, and a sleeve secured within said conduit so that fluids within said conduit flow through said sleeve, with a portion of said sleeve being separated from contact with the conduit and wherein said inner conduit surface comprises an inner surface of said sleeve.