An ultrasonic water meter capable of realizing dynamic real-time calibration of zero point and calibration method thereof

Abstract

The present invention discloses an ultrasonic water meter for realizing dynamic real-time calibration of zero point, including a water meter pipe section and ultrasonic flow sensors arranged on both sides of the pipe section and whose measuring direction is inclined with the flow direction of the fluid in the pipe, for real-time measurement of the flow velocity of the fluid in the pipe along the inclination direction, and also including zero point calibration sensors arranged on both sides of the pipe section and whose measuring direction is perpendicular to the flow direction of the fluid in the pipe, for real-time measurement of the zero point value in the pipe. The present invention also discloses a calibration method of the ultrasonic water meter. By installing a pair of zero point calibration sensors whose measuring direction is perpendicular to the flow direction of the fluid in the pipe on the pipe section, the flow velocity of the fluid in the pipe detected by the sensors is always 0 under ideal conditions, so the actual initial measured value is the initial value of the zero point measurement, and then the actual dynamic value of the zero point in the pipe can be obtained online, and the actual measured change rate of the zero point is obtained by this, which is used for the flow detection calibration of the ultrasonic water meter to improve its measurement accuracy and reduce the problem of inaccurate and insufficient measurement values ​​caused by the influence of time and environment.

Description

Technical Field

[0001] The invention belongs to the field of ultrasonic velocity measurement technology, and in particular relates to an ultrasonic water meter capable of realizing dynamic real-time calibration of zero point and a calibration method thereof. Background Art

[0002] With the visualization of smart water meter measurements and intelligent data management, smart water meters are increasingly being accepted by water companies in the market, and the number of smart water meters put into use has increased dramatically each year. However, smart water meters also have a fatal problem, which is the zero point problem. The zero point is the flow value displayed by the smart water meter when the water flow is completely still, which is collectively referred to as the static zero point value. Generally, smart water meters use the method of cutting to solve this problem. However, with the changes in time and environment, the aging of sensors and circuit boards, and the changes in water quality, the zero point will continue to change, so cutting cannot completely and thoroughly solve this problem.

[0003] like Figure 1-Figure 2 As shown, the traditional ultrasonic water meter (or ultrasonic flow meter, which converts flow rate by measuring flow velocity) uses several pairs of ultrasonic flow sensors 2 arranged in parallel on the pipe section 1, and detects the flow velocity at a certain angle to the flow direction of the fluid in the pipe, and then subtracts the set static zero point value to calculate the final flow velocity value. However, due to the above reasons, the static zero point value is not actually a fixed value, and there is fluctuation, which will cause a certain error in the final measurement value. This is a problem that has not been well solved in the entire ultrasonic water meter industry. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an ultrasonic water meter and a calibration method thereof which can realize dynamic real-time calibration of the zero point. By setting a zero point detection sensor perpendicular to the flow direction of the fluid in the pipe, the zero point value in the measured pipe section is measured dynamically in real time, thereby improving the accuracy of the final flow rate value.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] On the one hand, an ultrasonic water meter that realizes dynamic real-time calibration of zero point includes a water meter pipe section and ultrasonic flow sensors arranged on both sides of the pipe section and whose measuring direction is inclined to the flow direction of the fluid in the pipe, so as to measure the flow rate of the fluid in the pipe in real time along the inclination direction. It also includes a zero point calibration sensor arranged on both sides of the pipe section and whose measuring direction is perpendicular to the flow direction of the fluid in the pipe, so as to measure the dynamic value of the zero point in the pipe.

[0007] The ultrasonic flow sensor is of oblique insertion type and is inserted on the pipe section along the inclination direction.

[0008] The ultrasonic flow sensors are at least two pairs and are installed in parallel up and down.

[0009] The zero point calibration sensors are a pair and are inserted on the pipe section in a direction perpendicular to the flow direction of the fluid in the pipe.

[0010] On the other hand, a calibration method for an ultrasonic water meter that realizes real-time dynamic calibration of the zero point is disclosed, wherein ultrasonic flow sensors whose measuring directions are inclined to the flow direction of the fluid in the pipe are arranged on both sides of the pipe section, so as to measure the flow velocity of the fluid in the pipe along the inclination direction; zero point calibration sensors whose measuring directions are perpendicular to the flow direction of the fluid in the pipe are arranged on both sides of the pipe section, so as to measure the dynamic value of the zero point in the pipe; measurements are alternately performed by the ultrasonic flow sensor and the zero point calibration sensor, and the flow velocity value is corrected according to the dynamic value of the zero point measured by the zero point calibration sensor.

[0011] The correction formula is: flow rate value = measured flow rate value - static zero point value × zero point measured change rate; zero point measured change rate = zero point measured dynamic value / zero point measurement initial value.

[0012] An ultrasonic water meter and a calibration method thereof for realizing dynamic real-time calibration of zero point are adopted by the present invention. A pair of zero point calibration sensors whose measuring directions are perpendicular to the flow direction of the fluid in the pipe are installed on the pipe section. The flow velocity of the fluid in the pipe detected by the sensors is always 0 under ideal circumstances. Therefore, the actual initial measured value is the initial value of the zero point measurement. After that, the actual dynamic value of the zero point in the pipe can be obtained online, and the actual measured change rate of the zero point is obtained thereby, which is used for flow detection and calibration of the ultrasonic water meter to improve its measurement accuracy and reduce the problem of inaccurate and insufficient measurement values ​​due to the influence of time and environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0014] Figure 1 It is a structural schematic diagram of an ultrasonic water meter in the prior art.

[0015] Figure 2 Schematic diagram of a top view of an ultrasonic water meter in the prior art.

[0016] Figure 3 It is a structural schematic diagram of the ultrasonic water meter of the present invention.

[0017] Figure 4 It is a schematic top view of the ultrasonic water meter of the present invention.

[0018] Figure 5 is along Figure 4 Section view along line AA.

[0019] Figure 6 is along Figure 4 Sectional view along line DD. DETAILED DESCRIPTION

[0020] The ultrasonic water meter and calibration method thereof for realizing dynamic real-time zero point calibration of the present invention are as follows Figure 3-Figure 6 As shown, the present invention is similar to the prior art in that it also includes a water meter pipe section 1 and ultrasonic flow sensors 2 arranged on both sides of the pipe section 1 and whose measuring direction is inclined to the flow direction of the fluid in the pipe, so as to measure the flow velocity of the fluid in the pipe in real time along the inclination direction. The difference is that it also includes a zero point calibration sensor 3 arranged on both sides of the pipe section 1 and whose measuring direction is perpendicular to the flow direction of the fluid in the pipe, so as to measure the zero point value in the pipe in real time.

[0021] As an embodiment, the ultrasonic flow sensor 2 is inserted obliquely and installed on the pipe section 1 along the inclination direction. The ultrasonic flow sensor 2 is at least two pairs, each pair consisting of a transmitter and a receiver, which are arranged opposite to each other along the inclination direction on both sides of the pipe section 1, and the two pairs are installed in parallel up and down.

[0022] As an embodiment, the zero point calibration sensor 3 can adopt a pair of ultrasonic sensors, which is composed of a transmitter and a receiver, and is relatively inserted on the pipe section 1 along the vertical direction of the fluid flow in the pipe. Since the detection direction of the zero point calibration sensor 3 is perpendicular to the fluid flow direction in the pipe, the fluid flow rate in the pipe detected by it is always 0 under ideal circumstances. Therefore, its actual initial measured value is the initial value of the zero point measurement, and then the actual dynamic value of the zero point in the pipe can be obtained online, and the actual measured change rate of the zero point can be obtained thereby, which is used for the flow detection calibration of the ultrasonic water meter to improve its measurement accuracy.

[0023] The calibration method of the ultrasonic water meter for realizing the real-time dynamic calibration of the zero point by the present invention mainly comprises the following steps: arranging ultrasonic flow sensors 2 whose measuring directions are inclined with the flow direction of the fluid in the pipe at an angle on both sides of the pipe section 1, so as to measure the flow velocity of the fluid in the pipe in real time along the inclination direction and obtain the measured flow velocity value; arranging zero point calibration sensors 3 whose measuring directions are perpendicular to the flow direction of the fluid in the pipe at both sides of the pipe section 1, so as to measure the zero point fluctuation in the pipe in real time and obtain the measured dynamic value of the zero point; performing alternating measurement by the ultrasonic flow sensor 2 and the zero point calibration sensor 3, and correcting the flow velocity value according to the measured dynamic value of the zero point of the zero point calibration sensor 3, wherein the measured change rate of the zero point is the measured dynamic value of the zero point / the initial value of the zero point measurement, wherein the initial value of the zero point measurement is the value measured by the zero point calibration sensor 3 at the initial time, and as the time and environment and other factors change, the measured value, i.e., the measured dynamic value of the zero point will change to a certain extent, and the calibration by the method can make the finally obtained flow velocity value more accurate and reduce the error.

[0024] However, those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A calibration method for an ultrasonic water meter for realizing dynamic real-time calibration of zero point, the ultrasonic water meter comprising a water pipe section, characterized in that: Ultrasonic flow sensors whose measuring directions are at an angle to the flow direction of the fluid in the pipe are arranged on both sides of the pipe section, so as to measure the flow velocity of the fluid in the pipe along the direction of the angle; zero point calibration sensors whose measuring directions are perpendicular to the flow direction of the fluid in the pipe are arranged on both sides of the pipe section, so as to measure the zero point dynamic value in the pipe; the ultrasonic flow sensor and the zero point calibration sensor are used for alternate measurement, and the flow velocity value is corrected according to the zero point dynamic value actually measured by the zero point calibration sensor; The correction formula is: flow rate value = measured flow rate value - static zero point value × measured change rate of zero point; measured change rate of zero point = measured dynamic value of zero point / initial value of zero point measurement.

2. The method for calibrating an ultrasonic water meter for realizing dynamic real-time calibration of zero point according to claim 1, characterized in that: The ultrasonic flow sensor is of oblique insertion type and is inserted on the pipe section along the inclination direction.

3. The method for calibrating an ultrasonic water meter for realizing dynamic real-time calibration of zero point according to claim 1 or 2, characterized in that: The ultrasonic flow sensors are at least two pairs and are installed in parallel up and down.

4. The method for calibrating an ultrasonic water meter for realizing dynamic real-time calibration of zero point according to claim 1, characterized in that: The zero point calibration sensors are a pair and are inserted on the pipe section in a direction perpendicular to the flow direction of the fluid in the pipe.

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