| 摘要 |
A pulverulent material flow transducer has a frame that mounts on the exterior of a conduit in a pulverulent material transporting system. A load cell in the frame includes a sealed chamber one side of which is formed by a resilient control diaphragm, and communicating with the chamber are an air inlet pipe for admitting air at a constant pressure to the chamber, an air outlet pipe, and a bleed nozzle the inner end of which is so related to the control diaphragm as to provide an orifice for the bleed nozzle the area of which is varied by movement of the control diaphragm. A sensor member pivoted in a sealed hole in the conduit has a sensing arm to sense the volume of material flowing through the conduit and a force arm which acts through a guided piston rod and piston to move the control diaphragm and thus vary the bleed nozzle orifice in proportion to the volume of material passing through the conduit. This provides variable air pressure in the air outlet pipe which may be used for any desired measuring or control function; for example, controlling the position of a feed valve that controls the volume of material entering the conduit.
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