More-precise intelligent water meter flow metering method

Abstract

The invention relates to a more-precise intelligent water meter flow metering method. The method comprises the steps that (1) multiple instantaneous flow points are acquired between minimum instantaneous flow Q<1> and overload instantaneous flow Q<4>; (2) an impeller speed, corresponding to each instantaneous flow point, of an intelligent water meter is measured in an experiment; (3) an equivalentcorresponding to each speed point is solved according to K<n>=A<n> / N<n>; (4) a data table of the impeller speeds N<n> and the corresponding equivalents K<n> is established; (5) in a metering cycle, the lasting time of an impeller at each speed is metered; (6) according to the data table in the step (4), the equivalent, corresponding to each speed, of the impeller is looked up; and (7) according to accumulative flow L=N<1>*K<1>*t<1>+N<2>*K<2>*t<2>+N<3>*K<3>*t<3>+...+N<n>*K<n>*t<n>, total accumulative flow in the accumulative flow metering cycle is calculated. Through the method, metering is precise, smaller flow can be metered, and a water meter with a high R-value can be made.

Description

technical field [0001] The invention relates to the field of intelligent water meter measurement, in particular to a more accurate intelligent water meter flow measurement method. Background technique [0002] The old-fashioned mechanical horizontal screw-wing water meter and vertical screw-wing water meter use water flow to drive the screw-wing impeller to rotate, and rely on the gear train (horizontal screw-wing water meter turbine worm and gear train) to transmit the impeller speed to the character wheel and dial Convert the display flow rate, and convert the equivalent to a constant (m 3 / change). The national standard stipulates the overload instantaneous flow Q for water meters of different calibers. 4 , commonly used instantaneous flow Q 3 The value of the minimum instantaneous flow Q 1 , Boundary instantaneous flow Q 2 =1.6Q 1 There are different options, range ratio R=Q 3 / Q 1 . Since the mechanical water meter impeller speed conversion shows that the proce...

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Problems solved by technology

[0003] In recent years, there have been smart water meters that rely on magnetic induction pulses for measurement. The smart water meter drives the magnet to rotate through the impeller shaft to generate a pulse signal on the coil, and then uses the sensor to obtain the pulse signal to convert it into water flow. However, the measurement of water flow The method is to measure the ratio of the instantaneous water flow to the impeller speed as a constant, but in fact the relationship between the water flow and the impeller speed is nonlinear, which leads to inaccurate measurement and cannot make a water meter with a high R value