Flow meters
First Claim
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1. A flow meter comprising:
- a nozzle having a region which is divergent in the intended direction of flow through the flow meter,vanes which extend inwardly of the nozzle, each vane terminating at a respective radially inner free edge which extends along said region of the nozzle,a plug situated within the divergent region of the nozzle, wherein the plug having an outer surface which cooperates with the radially inner free edges of the vanes to guide the plug for displacement along said region of the nozzle, such displacement, by a pressure difference generated by the flowing fluid, varying the flow cross-section between the outer surface of the plug and the inner surface of the nozzle, andmeasuring means which is responsive to the pressure difference across the plug in the direction of flowing fluid, thereby to provide an output representing the flow rate of the fluid through the flow meter.
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Abstract
A flow meter comprises a divergent nozzle region 6 and a plug 10 which is axially displaceable within the nozzle region 6 under the influence of a flowing fluid. The plug 10 is guided, during displacement, by vanes 38 extending inwardly from the wall of the nozzle region 6. The plug 10 is displaceable against the action of a spring 20 which abuts a support ring 22. The force applied by the spring 20 to the support ring 22 is transmitted to a strain element 26. Processing circuitry 36 receives inputs from strain gauges 32 and provides an output representing the flow rate of fluid through the flow meter.
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Citations
13 Claims
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1. A flow meter comprising:
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a nozzle having a region which is divergent in the intended direction of flow through the flow meter, vanes which extend inwardly of the nozzle, each vane terminating at a respective radially inner free edge which extends along said region of the nozzle, a plug situated within the divergent region of the nozzle, wherein the plug having an outer surface which cooperates with the radially inner free edges of the vanes to guide the plug for displacement along said region of the nozzle, such displacement, by a pressure difference generated by the flowing fluid, varying the flow cross-section between the outer surface of the plug and the inner surface of the nozzle, and measuring means which is responsive to the pressure difference across the plug in the direction of flowing fluid, thereby to provide an output representing the flow rate of the fluid through the flow meter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification