CN113049049B - Water meter anti-rotation detection device and method - Google Patents
Water meter anti-rotation detection device and method Download PDFInfo
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- CN113049049B CN113049049B CN202110262347.3A CN202110262347A CN113049049B CN 113049049 B CN113049049 B CN 113049049B CN 202110262347 A CN202110262347 A CN 202110262347A CN 113049049 B CN113049049 B CN 113049049B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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Abstract
The invention provides a water meter anti-rotation detection device and a method, which are characterized in that a water meter is divided into a transmission cavity and a metering cavity which form watertight isolation; the transmission cavity is internally provided with a high R value transmission impeller and magnetic steel which coaxially rotates with the high R value transmission impeller; hall detection arrays which are connected with a controller and distributed above the magnetic steel are arranged in the metering cavity; the R value of the high R value drive impeller is an empirical value a that allows water flow motion to be detected at low flow conditions. The water flow meter can detect forward and reverse flow of water flow, obtains an accurate water consumption metering value through algorithm optimization, and is simple in structure and accurate in metering.
Description
Technical Field
The invention relates to the field of intelligent water meters, in particular to a water meter autorotation prevention detection device and method. Especially, the low-speed rotation of the water meter caused by the change of the pressure of the pipeline can be identified, and the problem of inaccurate measurement caused by the rotation problem is further solved.
Background
At present, the traditional mechanical water metering principle is that an impeller is driven to rotate by water flow, and a metering gear is further driven to rotate so as to realize water consumption metering. Usually, all can have certain dissolved air in the water supply pipe, and then form the pipeline bubble, and the bubble receives water pipeline pressure in these pipelines, and the change effect such as atmospheric pressure can make intraductal water flow, changes the pressure of air through the inflation or the shrink of intraductal air volume, forms new balance, and this process has formed the rotation of water gauge. The mechanical water meter is designed by considering the characteristic of unidirectional flow of water flow, the starting values of forward flow impellers and reverse flow impellers are inconsistent, and the rotating speed of the reverse flow impellers is lower than that of the forward flow impellers, so that the traditional water meter cannot accurately measure. The intelligent water meter adopting the Hall sensor and the magnetic steel for metering has no substantial difference from the mechanical water meter on the basis of the structure of the basic water meter, and also has the similar metering inaccuracy problem, which is particularly obvious under the condition of small water flow.
Disclosure of Invention
In order to overcome and reduce the defect that the traditional water meter cannot accurately measure during rotation, the invention provides a novel water meter anti-rotation detection device and a novel water meter anti-rotation detection method.
The technical scheme is as follows:
the utility model provides a water gauge rotation detection device that prevents which characterized in that: dividing the water meter into a transmission cavity and a metering cavity which form watertight isolation; the transmission cavity is internally provided with a high R value transmission impeller and magnetic steel which coaxially rotates with the high R value transmission impeller; hall detection arrays which are connected with a controller and distributed above the magnetic steel are arranged in the metering cavity; the R value of the high R value drive impeller is an empirical value a that allows water flow motion to be detected at low flow conditions.
Preferably, the hall detection array is a plurality of hall sensors mounted at a plurality of positions in geometric space on the detection plate.
Preferably, a transmission gear is arranged on the upper portion of a wheel shaft of the high R value transmission impeller, and magnetic steel is arranged on the transmission gear.
The detection method based on the anti-rotation detection device for the water meter is characterized by comprising the following steps of:
step S1: establishing a water meter forward and reverse impeller motion model, comprising:
measuring the relation between the forward rotating speed of the impeller and the flow under different constant flow points;
measuring the relation between the reverse rotation speed of the impeller and the flow under different constant flow points;
step S2: and the moving speed and direction of the impeller are obtained through the Hall detection array, and the water flow is calculated.
Preferably, in step S2:
the Hall detection array obtains orthogonal waveform output by detecting the change of the magnetic field; acquiring the motion direction of the impeller through the phase difference of the two groups of waveforms; acquiring the running speed s of the impeller through pulse waveforms; and (3) searching m corresponding to the abscissa s through the water flow motion model diagram:
wherein, L is water flow; m isiOne circle of pulse of the impeller corresponds to the water quantity; the total water consumption is the forward water quantity-the reverse water quantity.
Preferably, in step S2, the m-t correspondence of the non-measurement points is obtained by straight line fitting or least square curve fitting.
Preferably, the method further comprises the step S3:
establishing a rotation motion model to eliminate accumulated errors:
regarding the forward rotation with the forward rotation speed S < S as a rotation model within a set time t, and performing rotation flow deduction if the impeller reverse rotation speed S1< S' occurs within the following time t 1;
Wherein S is the upper limit of the autorotation forward rotation speed, and S' is the upper limit of the reverse rotation speed.
Preferably, in step S3: the deduction water quantity/positive small water flow is the deduction factor;
for inversion rates > S', a deduction factor x is taken as 1;
the total water consumption is the forward water quantity-the reverse water quantity x xn, wherein xn is the n-level deduction factor of the reverse flow.
The invention and the optimal selection scheme thereof can detect the forward and reverse flow of the water flow, and obtain the accurate water consumption metering value through algorithm optimization, and have simple structure and accurate metering.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic view of a water meter chamber according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a water meter drive chamber according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a forward water flow movement model according to an embodiment of the present invention;
FIG. 4 is a schematic view of a reverse water flow movement model according to an embodiment of the present invention;
in the figure: 1-a control circuit board; 2-a hall sensor; 3-detecting the plate; 4-magnetic steel; 5-a transmission gear; 6-wheel shaft; 7-high R value drive impeller.
Detailed Description
In order to make the features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail as follows:
As shown in fig. 1 and 2, in the present embodiment, the inside of the water meter is divided into a transmission chamber and a metering chamber. The two cavities are watertight and isolated. The transmission cavity is internally provided with a transmission impeller 1 with a high R value, the impeller drives a transmission gear 5 through a wheel shaft 6, and magnetic steel 4 is internally arranged on the gear. A Hall detection array formed by a plurality of Hall sensors 1 is arranged in the metering cavity, a microchip electronic processing module and an antenna are arranged on the control circuit board 1, and a battery is arranged in the metering cavity. The high R value transmission impeller can detect the tiny flow of water flow with high sensitivity and drive the metering gear to rotate. Because the transmission cavity also has the problem of inconsistent bidirectional water flow paths, the rotation quantity of the metering gear rotating forward and backward with the same water flow is inconsistent, and the actual water consumption is obtained after the difference is optimized by algorithms such as water flow direction identification, motion model matching, metering compensation and the like on a microchip.
A hall sensor is a magnetic field sensor made according to the hall effect. The hall effect is one of the magnetoelectric effects, which was discovered by hall (a.h. hall, 1855-. The method is widely applied to the aspects of industrial automation technology, detection technology, information processing and the like. The hall effect is a fundamental method for studying the properties of semiconductor materials. The Hall coefficient measured by a Hall effect experiment can be used for judging important parameters such as the conductivity type, the carrier concentration, the carrier mobility and the like of the semiconductor material. In the embodiment, the hall detection array identifies the rotation direction by the phase difference of output waveforms of the hall devices and identifies the number of rotation turns by the output waveforms by installing a plurality of angle hall devices in the geometric space on the detection plate 3. The number of turns and the direction of the rotation of the magnetic steel can be sensed through the rotating Hall array of the magnetic steel, and the number of turns is recorded through a memory on a circuit board connected with the Hall sensor.
In this embodiment, the high R value transmission impeller adopted has high sensitivity, can detect water flow movement under the condition of low flow, is a physical basis of a reverse rotation detection function, and the R value of the high R value transmission impeller can be selected according to multiple tests or experiences, and the higher the R value is, the more accurate the measurement result is generally.
As shown in fig. 3 and 4, in the detection method according to the above device, the forward and reverse water flow models are key for water consumption measurement, and a forward water flow model diagram and a reverse water flow model diagram can be obtained by measuring the motion relationship between the rotation speed and the flow rate of the impeller at different flow rates. Where the abscissa represents the time taken (milliseconds) for one rotation of the impeller and the ordinate represents the volume of water (milliliters) for one rotation of the impeller.
Based on this, the present embodiment can obtain the following anti-autorotation metering algorithm:
the technical problem is as follows:
because the water meter water inlet cavity is asymmetric in forward and reverse directions, the water flow drives the impeller to have forward and reverse differences. Normally, the forward starting flow is smaller than the directional starting flow, and the rotating speed of the forward impeller is larger than that of the reverse impeller under the same flow.
The solution is as follows:
1. and establishing a forward and reverse impeller motion model of the water meter.
The relation between the forward rotation speed of the impeller and the flow is measured at different constant flow points. As shown in fig. 3.
The relation between the reverse rotation speed of the impeller and the flow is measured at different constant flow points. As shown in fig. 4.
2. And (4) acquiring the movement speed and direction of the impeller through the Hall array and calculating the water flow.
The Hall array obtains orthogonal waveform output by detecting the change of the magnetic field. The moving direction of the impeller can be obtained through the phase difference of the two groups of waveforms. The impeller running speed r can be obtained through the pulse waveform. And m corresponding to the abscissa r is searched through the water flow motion model diagram.
Wherein, L is water flow; m isiOne circle of pulse of the impeller corresponds to the water quantity;
the total water consumption is the forward water quantity-the reverse water quantity.
For the m-t corresponding relation of non-measurement points, straight line fitting is generally adopted. In order to improve the metering precision, a least square curve fitting algorithm can be adopted.
3. The autorotation motion model:
because the rotation of the water meter is basically caused by the slow speed-promoted flow caused by the imbalance of the pressure in the pipeline, the rotation quantity of the metering gear rotating forward and backward with the same water flow is inconsistent because the transmission cavity also has the problem of inconsistent two-way water flow paths, and even the rotation of the impeller cannot be caused by the micro reverse flow. Thus, there is a positive cumulative error in the forward-reverse rotation. In order to eliminate the accumulated error, a rotation model is required to be established. In the present embodiment, if the forward rotation at the forward rotation speed S < S for a predetermined time t is regarded as a rotation model, and the impeller reverse rotation speed S1< S' occurs during the subsequent time t1, the rotation flow rate can be canceled. The deduction water quantity/positive small water flow is the deduction factor. To improve accuracy, multi-level withholding factors may be established.
Wherein S is the upper limit of the autorotation forward rotation speed, and S' is the upper limit of the reverse rotation speed.
For inversion rates > S', a deduction factor x is taken as 1;
the total water consumption is the forward water quantity-the reverse water quantity x xn, and xn is the n-level deduction factor of the reverse flow.
The present invention is not limited to the above preferred embodiments, and any other various types of water meter rotation-preventing detection devices and methods can be obtained according to the teaching of the present invention.
Claims (3)
1. The utility model provides a water gauge rotation detection device that prevents which characterized in that: dividing the water meter into a transmission cavity and a metering cavity which form watertight isolation; the transmission cavity is internally provided with a high R value transmission impeller and a magnetic steel which coaxially rotates with the high R value transmission impeller; hall detection arrays which are connected with a controller and distributed above the magnetic steel are arranged in the metering cavity; the R value of the high R value transmission impeller is an empirical value a capable of detecting water flow movement under the condition of low flow; the detection method comprises the following steps:
step S1: establishing a water meter forward and reverse impeller motion model, comprising:
measuring the relation between the forward rotating speed of the impeller and the flow under different constant flow points;
Under different constant flow points, measuring the relation between the reverse rotation speed of the impeller and the flow;
step S2: acquiring the movement speed and direction of the impeller through a Hall detection array and calculating water flow;
in step S2:
the Hall detection array obtains orthogonal waveform output by detecting the change of the magnetic field; acquiring the motion direction of the impeller through the phase difference of the two groups of waveforms; acquiring the running speed s of the impeller through pulse waveforms; and (3) searching m corresponding to the abscissa s through the water flow motion model diagram:
wherein, L is water flow; m isiOne circle of pulse of the impeller corresponds to the water quantity; the total water consumption is the forward water quantity-the reverse water quantity;
in step S2, for the m-t correspondence of the non-measurement points, straight line fitting or least square curve fitting is used to obtain;
further comprising step S3:
establishing a rotation motion model to eliminate accumulated errors:
regarding the forward rotation with the forward rotation speed S < S as a rotation model within a set time t, and performing rotation flow deduction if the impeller reverse rotation speed S1< S' occurs within the following time t 1;
wherein S is the upper limit of the autorotation forward rotation speed, and S' is the upper limit of the reverse rotation speed;
in step S3: the deduction water quantity/positive small water flow is the deduction factor;
for inversion rates > S', a deduction factor x ═ 1 is employed;
The total water consumption is the forward water quantity-the reverse water quantity x xn, wherein xn is the n-level deduction factor of the reverse flow.
2. The water meter autorotation prevention detection device as claimed in claim 1, wherein: the Hall detection array is a plurality of Hall sensors which are arranged at a plurality of positions in the geometric space on the detection plate.
3. The water meter autorotation prevention detecting device as claimed in claim 1, wherein: and a transmission gear is arranged on the upper part of the wheel shaft of the high R value transmission impeller, and magnetic steel is arranged on the transmission gear.
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| TW200900665A (en) * | 2006-12-29 | 2009-01-01 | Bartels Mikrotechnik Gmbh | Method and apparatus for flow measurement |
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| CN108801372A (en) * | 2018-08-28 | 2018-11-13 | 福水智联技术有限公司 | Improve the remote transmitting water meter and its working method of impeller the operation is stable |
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| WO2019098408A1 (en) * | 2017-11-15 | 2019-05-23 | 부경수도 주식회사 | Water meter to which flow path guidance and three-axis hall sensor are applied |
| CN211824560U (en) * | 2019-11-19 | 2020-10-30 | 扬州华科智能科技有限公司 | Building intelligence pulse measurement water gauge device based on BIM |
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Patent Citations (9)
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| CN1826511A (en) * | 2003-04-14 | 2006-08-30 | 森泰克有限公司 | Magnetic flow transducer and flow meter incorporating the same |
| CN2618147Y (en) * | 2003-06-02 | 2004-05-26 | 姚平壤 | Intelligent water-saving telemetering watermeter |
| TW200900665A (en) * | 2006-12-29 | 2009-01-01 | Bartels Mikrotechnik Gmbh | Method and apparatus for flow measurement |
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| CN208621103U (en) * | 2018-08-28 | 2019-03-19 | 福水智联技术有限公司 | Improve the remote transmitting water meter of impeller the operation is stable structure |
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Inventor after: Xie Dong Inventor after: Shi Tao Inventor after: Ren Liang Inventor after: Chen Shun Inventor after: Tang Feng Inventor after: Chen Hong Inventor before: Xie Dong Inventor before: Shi Tao Inventor before: Chen Shun Inventor before: Tang Feng Inventor before: Chen Hong |
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Denomination of invention: Water meter anti rotation detection device and method Effective date of registration: 20221010 Granted publication date: 20220628 Pledgee: Industrial Bank Limited by Share Ltd. Fuzhou branch Pledgor: Fushui Zhilian Technology Co.,Ltd. Registration number: Y2022350000129 |