Liquid flow meter

Details Liquid flow meter Liquid flow meter

1994-07-25

1996-07-30

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Using rotating member with particular electrical output or...

G01F 100

Patent

active

055401074

ABSTRACT:
An improved liquid flow meter for measuring moderate to low liquid flow rates with improved accuracy and minimal back pressure. The flow meter has a housing with two halves, a cover and a body, that fit together around a impeller so that liquid may flow and turn the impeller. Impeller performance is improved by use of a tapered inlet nozzle that increases liquid velocity while minimizing back pressure. Liquid is introduced tangent to the impeller by the tapered inlet nozzle to enhance initial impeller turning. The impeller registers the liquid flow by turning. The turning of the impeller is sensed electronically. Plenums are used for inlet and outlet flow to create regions of relatively consistent pressure regardless of duct location and orientation. The impeller fins are almost as wide as the impeller chamber to prevent liquid flow around the impeller. A magnet is encapsulated within the impeller that gives rise to a detectable electromagnetic flux when the impeller turns. A wire coil is used to detect the changing magnetic flux generated by the turning magnet. The wire coil uses an iron core to enhance flux detection. A pre-programmed microprocessor detects the coil's response and calculates pertinent information such as cumulative liquid flow. The microprocessor also keep track of the time since last reset. Flow meter status and warnings are transmitted to the user via indicators.

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