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Fluid measurement meter

A flow meter and fluid technology, used in liquid/fluid solid measurement, measurement device, measurement flow/mass flow, etc., to achieve the effect of large tolerance of installation conditions, improved linearity, and uniform flow

Inactive Publication Date: 2003-06-04
ELSTER WATER METERING LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing regulating devices and commonly used methods fail to provide a solution to the problem of improving the linearity of flowmeters operating over such a large regulating range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] Figures 1 and 2 show the geometry of an oscillating jet type fluid flow meter for measuring domestic water supplies. The flow meter is of the oscillating type of return fluid, which includes a convergent inflow channel 1 leading to a slender jet-shaping hole 2 (the jet-shaping hole is in the shape of a slit and is located in a direction perpendicular to the plane of FIG. 2 ), a separation column 3, Two expanding attachment walls 4, and two return channels 5. A flow meter of this construction is described in EP-A-0381344. In FIG. 2, arrows indicate the direction of the inflow liquid flow, and the liquid flow enters the inflow channel 1 through the flow regulating device 6 at the inlet of the inflow channel, and the flow regulating device is a porous flat plate.

[0029] When the fluid flows into the flow meter, a jet is formed through the converging inflow channel 1 and the jet shaping hole 2 . The inflow channels converge only in planes perpendicular to the jet-shapin...

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PUM

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Abstract

An oscillating jet type of fluidic flowmeter, for use as a domestic water meter, is provided with a conditionning disc (6) at its entry to increase the linearity of the meter. The disc is mounted upstream of an elongate jet-forming orifice, being at the mouth of a convergent entry passage leading into the orifice. The disc can be in the form of a slotted plate, having three slots (12) separated by elongate bluff blocking regions (13), the slots and blocking regions being in parallel with the jet-forming orifice. The conditioning disc has the effect under laminar and transitional inlet flow conditions of flattening the velocity flow profile and introducing turbulence into the flow, whereby fully developed turbulent flow conditions become simulated at the orifice.

Description

technical field [0001] The invention relates to a fluid flow meter. Background technique [0002] In EP-A2-0381344 a water meter of the fluid return oscillator type is disclosed, suitable for use as a water meter for domestic water supply. [0003] As disclosed, the water meter has a converging inlet communicating with a jet-shaped orifice in the form of an elongated slit. The slits direct the water flow into the diverging main conduit separated by dividers. Feedback from the main conduit returns to opposite sides of the fluidic channel adjacent to the inlet. The liquid jet is attached to one wall of the main pipe and then to the other side, repeatedly oscillating back and forth and laterally, the frequency of which depends on the flow rate. Therefore, measuring the frequency of the oscillations can be used to determine the flow rate. As described in EP-A2-0381344, such measurements may be accomplished by establishing a magnetic field across at least one of the pipes and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/20G01F1/32
CPCG01F1/3227G01F1/32
Inventor 奈尔·福密之迈克尔兰里·桑德森
Owner ELSTER WATER METERING LTD