Title: Apparatus for measuring the flowrate of particulate solid material

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Abstract: An expansion chamber having an internal cylindrical wall forming a passageway therethrough includes a vertically positioned upper end portion and a lower end portion disposed angularly relative to the upper end portion. The upper end portion is connected to an inlet portion having a throat which is axially aligned with a vertical duct connected to the inlet portion. Particulate solid material flowing through the vertical duct under the influence of gravity at a substantially constant velocity enters the inlet portion and is directed through the throat into the passageway. An impact member is axially supported by a rod within the passageway in the upper end portion. All the particulate material passing through the throat impinges upon the conical surface of the impact member and is directed therefrom through the annular passage between the lower peripheral edge of the impact member and the internal wall of the expansion chamber. The particulate material exits the expansion chamber through an eccentric outlet provided in the lower end portion which is displaced from vertical alignment with the upper end portion. The rod supporting the impact member is axially positioned within the upper end portion and passes through an opening in the wall of the lower end portion. The bottom tip of the rod rests upon an elastic diaphragm maintained in the sealed pressure system of a load cell positioned externally of the expansion chamber. The momentum of the particulate matter impinging upon the impact member is transmitted therefrom to the rod moving the rod downwardly thereby increasing the pressure exerted by the tip of the rod upon the diaphragm. The change in pressure is instantaneously recorded by the load cell and converted by an electrical recording device to a numerical readout representing the mass flowrate of the particulate material passing through the vertical duct.


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