Venturi tube with variable throat tube section size

Abstract

The invention discloses a Venturi tube with a variable throat tube section size. The venturi tube comprises a rigid outer tube, a first-layer tubular cavity and a second-layer tubular cavity are formed in the rigid outer tube, a first-layer tubular spacer bush is arranged between the first-layer tubular cavity and the second-layer tubular cavity, a second-layer tubular spacer bush is arranged on the outer ring side of the second-layer tubular cavity, the first-layer tubular spacer bush and the second-layer tubular spacer bush are each divided into an elastic middle section and two rigid side sections which are connected with each other, the first-layer tubular cavity is filled with a magnetofluid liquid, the second-layer tubular cavity is filled with an electrorheological fluid, and two isolated conductive layers are attached to the two sides of the inner surface of the second layer tubular cavity. And conductive layers are connected with electrodes, a plurality of sets of electromagnetic coils are further arranged outside a rigid outer pipe, and the multiple sets of electromagnetic coils and the wires are connected with a controller. The Venturi tube has the characteristics that the section size of the throat tube of the venturi tube in the tube body can be adjusted at any time for flow limiting according to the actual flow limiting requirement of the throat tube part of the venturi tube, and so on.

Description

technical field [0001] The invention relates to the technical field of Venturi tube structure, in particular to a Venturi tube with variable throat section size. Background technique [0002] For the flow measurement of liquid and gas, by installing a sensor on the pipeline through which the fluid flows, the electrical signal is measured by the sensor, and the electrical signal can reflect the pressure difference of the fluid inside the pipeline, and the flow velocity of the fluid can be calculated through the pressure difference, according to the fluid The relationship between density ρ, flow velocity v, cross-section A and flow Q is: Q=ρ×v×A can obtain flow; due to the limitation of sensor measurement range, the pressure difference Δp that can be sensed is between Δpmin~Δpmax, for The same measuring pipe, flow turndown ratio equal [0003] In actual use scenarios, the range ratio of some flow processes is very large, and a single conventional flowmeter cannot meet the...

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