Controllable constriction device for the throat of a venturi channel for introducing a liquid additive into a stream of main liquid
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United States of America Patent
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Feb 5, 2019
Grant Date -
Dec 17, 2015
app pub date -
Dec 17, 2013
filing date -
Jan 17, 2013
priority date (Note) -
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Abstract
Metering device for introducing a liquid additive into a main liquid flowing along a pipe, includes a pump for withdrawing additive from a container and metering it, this pump including a first inlet for receiving a flow of main liquid which drives the pump, a second inlet for picking up additive and an outlet for the resulting mixture; a Venturi installed in the pipe, and connected in parallel with the pump, the first pump inlet connected by a first line to the Venturi inlet while the outlet connected by a second line to the Venturi throat; a first element for varying the restriction at the Venturi neck, and a second element sensitive to the pressure drop across the pump for controlling the first element to reduce the bore section when the pressure drop across the pump increases, and increase the bore section when the pressure drop across the pump decreases.
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