초록 ▼

A flowmeter with a main conduit having a constriction formed therein through which a main flow passes, and a by-pass conduit which is in fluid connection with the main conduit upstream and downstream of the constriction and in which a by-pass flow passes in response to a pressure drop across the con

A flowmeter with a main conduit having a constriction formed therein through which a main flow passes, and a by-pass conduit which is in fluid connection with the main conduit upstream and downstream of the constriction and in which a by-pass flow passes in response to a pressure drop across the constriction. The constriction includes a conical body which is movable within the main conduit to produce an increasing flow area in response to an increasing pressure drop across the constriction. A by-pass flowmeter is provided in the by-pass conduit which produces signals in proportion to a by-pass flow through the by-pass conduit. A calibrated electronic signal converter converts signals produced by the by-pass flowmeter to signals which correspond to the total flow through the main conduit.

대표청구항 ▼

A flowmeter comprising: a main conduit operable to transmit a main fluid flow therethrough a movable constriction device housed in the main conduit, the constriction device defining a variable fluid throughflow area in the main conduit, the variable fluid throughflow area variable based on a variabl

A flowmeter comprising: a main conduit operable to transmit a main fluid flow therethrough a movable constriction device housed in the main conduit, the constriction device defining a variable fluid throughflow area in the main conduit, the variable fluid throughflow area variable based on a variable fluid pressure drop across the constriction device, the variable fluid throughflow area variable from a first throughflow area corresponding to a first main flow rate through the main conduit and a first fluid pressure drop, to a greater second throughflow area corresponding to a greater second main flow rate through the main conduit and a greater second fluid pressure drop, the second main flow rate being greater than would be expected if the first throughflow area remained constant as the first pressure drop increased to the second pressure drop; a by-pass conduit in fluid connection with the main conduit upstream and downstream of the constriction device, the by-pass conduit operable to transmit a variable by-pass flow therethrough, the by-pass flow variable from a first by-pass flow rate corresponding to the first main flow rate, to a second by-pass flow rate corresponding to the second main flow rate, the second by-pass flow rate being less than would be expected if the first throughflow area remained constant as the first pressure drop increased to the second pressure drop; and a calibrated flowmeter provided in the bypass conduit, the calibrated flowmeter in communication with the by-pass flow and determining the main flow rate based on the by-pass flow rate, the calibrated flowmeter calibrated to accurately determine the main flow rate when the second main flow rate ranges up to at least 1000 times greater than the first main flow rate.