阅读说明：本技术 一种串并联耦合式多工位水表检定装置及方法 (Serial-parallel coupling type multi-station water meter calibrating device and method ) 是由 张圆明 卢其伦 吴永忠 李焯健 滕藤 王志伟 于 2021-07-26 设计创作，主要内容包括：本发明公开了一种串并联耦合式多工位水表检定装置以及方法,该装置包括N条通道,N条通道相并联,汇聚连接至工作量器；每一条通道均包括进水阀门、流量调节阀,进水阀门和流量调节阀之间的管路中用于连接安装n台被检水表,调节阀的出水端连接标准表,标准表的出水端连接至工作量器；每一台被检水表和标准表均和控制器相连接,所述控制器用于接收每一台被检水表和标准表的检定信号；该工作量器包括电子秤以及置于电子秤上的收集容器。本发明是一种简单、高效、稳定、可靠、成本低、易安装的串并联耦合式多工位水表检定方法及装置,值得大力推广应用。(The invention discloses a series-parallel coupling type multi-station water meter calibrating device and a method, wherein the device comprises N channels, wherein the N channels are connected in parallel and converged and connected to a workload meter; each channel comprises a water inlet valve and a flow regulating valve, wherein the pipeline between the water inlet valve and the flow regulating valve is used for connecting and installing n detected water meters, the water outlet end of the regulating valve is connected with a standard meter, and the water outlet end of the standard meter is connected with a workload meter; each detected water meter and each standard meter are connected with a controller, and the controller is used for receiving detection signals of each detected water meter and each standard meter; the work-load cell includes an electronic scale and a collection container disposed on the electronic scale. The invention is a simple, high-efficiency, stable, reliable, low-cost, easy-to-install serial-parallel coupling type multi-station water meter calibration method and device, and is worth of wide popularization and application.)

1. A series-parallel coupling type multi-station water meter calibrating device is characterized by comprising N channels, wherein the N channels are connected in parallel and converged and connected to a workload meter;

each channel comprises a water inlet valve and a flow regulating valve, wherein the pipeline between the water inlet valve and the flow regulating valve is used for connecting and installing n detected water meters, the water outlet end of the regulating valve is connected with a standard meter, and the water outlet end of the standard meter is connected with a workload meter;

the work load device comprises an electronic scale and a collecting container arranged on the electronic scale;

each detected water meter and each standard meter are connected with a controller, and the controller is used for receiving signals of each detected water meter and each standard meter;

wherein N and N are integers of 1 or more.

2. The apparatus for calibrating a serial-parallel coupled multi-station water meter as claimed in claim 1, wherein the collecting container is connected with a drain valve, the drain valve is connected to the water tank, and water in the water tank is transferred to the inlet valve of each channel through the water pump.

3. The apparatus for calibrating a series-parallel coupled multi-station water meter as claimed in claim 2, wherein a pressure stabilizing vessel is connected and installed between the water outlet end of the water pump and the water inlet valve.

4. A multi-station water meter calibrating device coupled in series and parallel according to any one of claims 1 to 3, wherein each passage further comprises a meter clamping device for clamping n tested water meters.

5. The series-parallel coupling type multi-station water meter calibrating device as claimed in claim 1, wherein N is more than or equal to 1 and less than or equal to 4, and N is more than or equal to 1 and less than or equal to 10.

6. A multi-station water meter calibration method, which is carried out based on the series-parallel coupling type multi-station water meter calibration device of claim 4, and comprises the following steps:

the method comprises the following steps of (1) calibrating a common flow point of the water meter:

1) opening the water inlet valve of one channel and closing the water inlet valves of other parallel channels;

2) water is introduced within the rated flow range of the detected water meter, and air in the detected water meter and the pipeline of the channel is removed;

3) regulating the flow of the channel to a flow value of a common flow point and keeping the flow value stable, and enabling the workload device to be in a work waiting state;

4) the detected water meter is in a motion state, the reading of the detected water meter is read, and the water flow is synchronously guided to the collecting container;

5) after the detected water meter flows for a specified time or the water consumption is detected, and when the reading of the detected water meter is read, the commutator is synchronously started to lead the water flow away and does not lead to the collecting container any more;

6) calculating the indicating value of the volume of the water meter to be detected, reading the reading of the electronic scale and calculating the actual volume of the water meter to be detected, and comparing the 2 volume values to calculate the indicating value error of the water meter to be detected in the channel to be detected at the common flow detection point;

and (4) referring to the above flows 1) -6), sequentially completing the verification of the common flow points of the detected water meters of other channels until the verification of the common flow points of the detected water meters of all channels is completed.

7. A multi-station water meter calibration method as claimed in claim 6, wherein the method further comprises:

and (3) calibrating the dividing flow points of all channel water meters:

1) opening water inlet valves of all the channels;

2) water is introduced within the rated flow range of the detected water meter, and air in the detected water meter and the pipeline of the channel is removed;

3) regulating the flow of each channel to a flow value of a boundary flow point and keeping the flow value stable, and enabling each channel standard meter to be in a work waiting state, so that the verification signal of the detected water meter of each channel is in a normal output state;

4) starting a measurement instruction, synchronously receiving signals of the standard meters of each channel and verification signals of the detected water meter by the controller, and measuring the time corresponding to the signals when the signals cannot meet the synchronization requirement by the controller so as to correct the actual volume measured by the standard meters of each channel to the volume consistent with the reading time of the detected water meter according to two time differences;

5) starting a measurement stopping instruction after the detected water meter flows through the specified detection water consumption, stopping receiving the standard meter signal and the detection signal of the detected water meter by the controller, and stopping measuring time;

6) and calculating the volume indicating value flowing through the meter according to the signal of each detected water meter of each channel, integrating the flow signal of the standard meter corresponding to each channel between the verification starting time and the verification ending time of each detected water meter to serve as the actual volume flowing through each detected water meter, and calculating the indicating value error of each detected water meter at the boundary flow verification point.

8. A multi-station water meter calibration method as claimed in claim 7, wherein in the calibration step of the dividing flow points of all the channel water meters, the flow value of each channel is stabilized at Q₂～1.1Q₂，Q₂Is the demarcation flow rate.

9. A multi-station water meter calibration method as claimed in claim 6 or 7, wherein the method further comprises:

the method comprises the following steps of (1) calibrating the minimum flow point of all channel water meters:

1) opening water inlet valves of all the channels;

2) water is introduced within the rated flow range of the detected water meter, and air in the detected water meter and the pipeline of the channel is removed;

3) regulating the flow of each channel to the flow value of the minimum flow point and keeping the flow value stable, and enabling each channel standard meter to be in a work waiting state, so that the verification signal of the detected water meter of each channel is in a normal output state;

4) starting a measurement instruction, synchronously receiving signals of the standard meters of each channel and verification signals of the detected water meter by the controller, and measuring the time corresponding to the signals when the signals cannot meet the synchronization requirement by the controller so as to correct the actual volume measured by the standard meters of each channel to the volume consistent with the reading time of the detected water meter according to two time differences;

5) starting a measurement stopping instruction after the detected water meter flows through the specified detection water consumption, stopping receiving the standard meter signal and the detection signal of the detected water meter by the controller, and stopping measuring time;

6) and calculating the volume indicating value flowing through the meter according to the signal of each detected water meter of each channel, integrating the flow signal of the standard meter corresponding to each channel between the detection starting time and the detection ending time of each detected water meter to serve as the actual volume flowing through each detected water meter, and calculating the indicating value error of each detected water meter at the minimum flow detection point.

10. A multi-station water meter calibration method as claimed in claim 9, wherein in the calibration step of the minimum flow point of all channel water meters, the flow value of each channel is stabilized at Q₁～1.1Q₁，Q₁Is the minimum flow.

Technical Field

The invention relates to the technical field of metering, in particular to a series-parallel coupling type multi-station water meter calibrating device and method.

Background

Water meters are instruments for continuously measuring, recording and displaying the volume of water flowing through a measuring sensor under measurement conditions, and are classified into mechanical water meters, mechanical water meters with electronic devices, and electronic water meters. The water meters of the water supply and discharge units are measuring instruments for trade settlement of both water supply and discharge parties, and the measuring accuracy is a key index for measuring the quality of the water meters. The verification work of the water meter is a basic means for checking whether the metering accuracy of the water meter is qualified or not, and comprises 4 verification items, namely appearance, mark and seal, electronic device function, sealing performance and indication error. The water meter indication error verification project is mainly developed by adopting a comparison method, namely based on a continuity equation, the accumulated flow passing through the water meter is equal to the volume passing through the main standard, so that the accuracy of the water meter is determined; the indication error calibration method comprises a start-stop method, a reversing method and a flow time method. General flow Q for indicating value error detection₃And a boundary flow rate Q₂Minimum flow rate Q₁The three flow points are qualified only if the indication errors of the 3 flow points all meet the maximum allowable error requirement specified in the Drinking Cold Water Meter verification regulations (JJG 162-2019); ratio Q₂/Q₁Is 1.6, Q₃/Q₁The values of (A) are selected from the following table.

TABLE 1Q₃/Q₁Numerical value of

40	50	63	80	100
					125	160	200	250	315
400	500	630	800	1000

When the water meter is detected by adopting a start-stop method, the detection water consumption is in accordance with the regulations of the following table.

TABLE 2 Start-stop method for Water consumption calibration

When the water meter is detected by other methods, the water consumption is detected to ensure that the uncertainty of the indication error measurement result is not greater than the uncertainty of the start-stop method.

In general, at a common flow rate Q₃And a boundary flow rate Q₂Minimum flow rate Q₁When the three flow points are detected, the detection scale divisions or the detection signal resolution are the same; as can be seen from table 1, the common flow rate is greater than the demarcation flow rate and the minimum flow rate by more than 20 times, which means that the verification time of the demarcation flow rate and the minimum flow rate verification point is greater than the verification time of the common flow rate point by more than 20 times (on the premise that the verification time is longer than 1 min). Therefore, to greatly improve the calibration efficiency of the water meter, it is critical to reduce the calibration time of the demarcation flow point and the minimum flow point, and the effect is more obviousIt is noted that.

In order to improve the verification efficiency, most of domestic legal metrological verification mechanisms and water meter production enterprises adopt a serial water meter verification device, namely a plurality of measured water meters with the same model and specification are installed on a device measurement section in series (no obvious mutual influence between the front water meter and the rear water meter is ensured), water passes through each measured water meter and a metering standard device in sequence when the indication error of the water meter is verified, and the indication error of the measured water meter is obtained by comparing the volume indication value of each water meter in a verification time period with the actual volume of the standard device. Through the serial connection of the measured meters, although the nominal verification time of a single meter is not reduced, the actual conversion verification time of each flow point of each meter is greatly reduced due to the synchronous verification of a plurality of water meters. Nevertheless, the serial number of the detected water meters is generally not more than 10 (due to the limitation of the pump head of the calibrating device), the calibrating efficiency of the existing water meter calibrating device still hardly meets the increasing water meter calibrating requirement, and a more efficient water meter calibrating device is urgently needed to be developed.

Disclosure of Invention

In order to solve at least one technical problem in the background art, the invention provides a serial-parallel coupling type multi-station water meter calibrating device and method.

In order to achieve the purpose, the technical scheme of the invention is as follows:

in a first aspect, an embodiment of the present invention provides a serial-parallel coupled multi-station water meter calibrating device, where the device includes N channels, where the N channels are connected in parallel and converged to a workload meter;

each channel comprises a water inlet valve and a flow regulating valve, wherein the pipeline between the water inlet valve and the flow regulating valve is used for connecting and installing n detected water meters, the water outlet end of the regulating valve is connected with a standard meter, and the water outlet end of the standard meter is connected with a workload meter;

the work load device comprises an electronic scale and a collecting container arranged on the electronic scale;

each detected water meter, the standard meter and the controller are connected, and the controller is used for receiving signals of each detected water meter and the standard meter;

wherein N and N are integers of 1 or more.

Furthermore, the collecting container is connected with and installed with a water drain valve, the water drain valve is connected to the water tank, and water in the water tank is transmitted to the water inlet valve of each channel through the water pump.

Furthermore, a pressure stabilizing container is connected and installed between the water outlet end of the water pump and the water inlet valve.

Furthermore, each channel also comprises a meter clamping device used for clamping the n detected water meters.

Furthermore, N is more than or equal to 1 and less than or equal to 4, and N is more than or equal to 1 and less than or equal to 10.

In a second aspect, an embodiment of the present invention provides a multi-station water meter calibration method, where the method is performed based on the above-mentioned serial-parallel coupling type multi-station water meter calibration apparatus, and the method includes:

the method comprises the following steps of (1) calibrating a common flow point of the water meter:

1) opening the water inlet valve of one channel and closing the water inlet valves of other parallel channels;

2) water is introduced within the rated flow range of the detected water meter, and air in the channel water meter and the pipeline is removed;

3) regulating the flow of the channel to a flow value of a common flow point and keeping the flow value stable, and enabling the workload device to be in a work waiting state;

4) the detected water meter is in a motion state, the reading of the detected water meter is read, and the water flow is synchronously guided to the collecting container;

5) after the detected water meter flows for a specified time or the water consumption is detected, and when the reading of the detected water meter is read, the commutator is synchronously started to lead the water flow away and does not lead to the collecting container any more;

6) calculating the indicating value of the volume of the water meter to be detected, reading the reading of the electronic scale and calculating the actual volume of the water meter to be detected, and comparing the 2 volume values to calculate the indicating value error of the water meter to be detected in the channel to be detected at the common flow detection point;

and (4) referring to the above flows 1) -6), sequentially completing the verification of the common flow points of the detected water meters of other channels until the verification of the common flow points of the detected water meters of all channels is completed.

Further, the method further comprises:

and (3) calibrating the dividing flow points of all channel water meters:

1) opening water inlet valves of all the channels;

2) water is introduced within the rated flow range of the water meter, and air in the detected water meter and the pipeline of the channel is removed;

3) adjusting the flow of each channel to a flow value of a boundary flow point and keeping the flow value stable, and enabling each channel standard meter to be in a work waiting state, so that the verification signal of each channel water meter is in a normal output state;

4) starting a measurement instruction, synchronously receiving a signal of each channel standard meter and a verification signal of the water meter by the controller, and measuring the time corresponding to the signal of each channel standard meter when the synchronization requirement cannot be met by the controller so as to correct the actual volume measured by each channel standard meter to the volume consistent with the reading time of the water meter according to two time differences;

5, starting a measurement stopping instruction after the water meter flows through the specified verification water consumption, stopping receiving the standard meter signal and the verification signal of the water meter by the controller, and stopping measuring time;

6) and calculating the volume indicating value flowing through the meter according to the signal of each detected water meter of each channel, integrating the flow signal of the standard meter corresponding to each channel between the verification starting time and the verification ending time of each detected water meter to serve as the actual volume flowing through each detected water meter, and calculating the indicating value error of each detected water meter at the boundary flow verification point.

Further, the method further comprises:

the method comprises the following steps of (1) calibrating the minimum flow point of all channel water meters:

1) opening water inlet valves of all the channels;

2) water is introduced within the rated flow range of the water meter, and air in the detected water meter and the pipeline of the channel is removed;

3) adjusting the flow of each channel to the flow value of the minimum flow point and keeping the flow value stable, and enabling each channel standard meter to be in a work waiting state, so that the verification signal of each channel water meter is in a normal output state;

4) starting a measurement instruction, synchronously receiving a signal of each channel standard meter and a verification signal of the water meter by the controller, and measuring the time corresponding to the signal of each channel standard meter when the synchronization requirement cannot be met by the controller so as to correct the actual volume measured by each channel standard meter to the volume consistent with the reading time of the water meter according to two time differences;

5) starting a measurement stopping instruction after the detected water meter flows through the specified detection water consumption, stopping receiving the standard meter signal and the detection signal of the water meter by the controller, and stopping measuring time;

6) and calculating the volume indicating value flowing through the meter according to the signal of each detected water meter of each channel, integrating the flow signal of the standard meter corresponding to each channel between the detection starting time and the detection ending time of each detected water meter to serve as the actual volume flowing through each detected water meter, and calculating the indicating value error of each water meter at the minimum flow detection point.

Compared with the prior art, the invention has the beneficial effects that:

1. the high-precision electronic scale and the standard meter are used as a main standard device to automatically collect the actual volume of the flowing water meter, and a plurality of water meters with the same specification and model can be simultaneously detected in a series-parallel coupling mode, namely, a measuring section of the detecting device is provided with a plurality of detecting channels, each channel is connected with a plurality of detected water meters in series, and the number of the water meters of each channel is the same, so that the resistance losses of the channels are basically consistent; the method can be used for detecting the water meter according to the drinking cold water meter detection regulation (JJG 162-2019) by adopting a reversing method (a metering standard adopts an electronic scale) and a flow time method (the metering standard adopts a standard table). The measurement and control controller simultaneously receives the acquired signals of the electronic scale and the standard meters of all channels and calculates the actual volume of the water meter to be measured flowing through; obtaining volume indicating values of the flowing water meters according to signals or artificial readings of each detected meter of each channel, and comparing the two volume values to calculate indicating value errors of each detected water meter; the standard meter can also be used as an instant flow indicator to display water flow in real time and provide a basis for the measurement and control software to judge whether the flow reaches the flow of the verification point.

2. When the demarcation flow point and the minimum flow point are detected, the circulating water pump can simultaneously meet the water flow supply of each channel because 2 flows are only one tenth of the common flowsAccording to the requirements, the flow regulating valve is combined, the water flow of each channel can be quickly and accurately regulated, and the flow value of each channel can reach the flow value of the verification point and keep stable, namely the flow value of each channel is stabilized at Q when the demarcation flow point is detected₂～1.1Q₂When the minimum flow point is detected, the flow value of each channel is stabilized at Q₁～1.1Q₁. Therefore, the method can realize the verification of the demarcation flow point (or the minimum flow point) of the water meters of all the channels at the same time, and the water meters are verified by adopting the flow time method and the standard meter of the corresponding channel by adopting the metering standard device of each channel. By adding the verification channel, the verification time of the water meter boundary flow point and the minimum flow point is greatly reduced, and the verification time of the 2 flow points is far longer than that of the common flow points, so that the verification efficiency is greatly improved in a comprehensive manner, the time cost is saved, the verification work is accurate and efficient, and reference is provided for improving the verification efficiency of domestic legal metrological verification mechanisms and water meter production enterprises.

3. The existing calibrating device can be conveniently transformed into multiple channels at low cost, each channel only needs to be additionally provided with 1 meter clamping device, a water inlet valve, a flow regulating valve and a 0.2-level standard meter, and a calibrating and measuring system is optimized at the same time, so that the measuring and measuring system can simultaneously control, record, calculate and generate a calibrating certificate for calibrating the multi-channel water meter. Therefore, the method and the device for calibrating the series-parallel coupling type multi-station water meter are simple, efficient, stable, reliable, low in cost and easy to install, and are worthy of great popularization and application.

Drawings

Fig. 1 is a schematic composition diagram of a serial-parallel coupling type multi-station water meter calibration device according to an embodiment of the present invention.

Detailed Description

Example (b):

in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection, electrical connection and signal connection; they may be connected directly or indirectly through intervening media, so to speak, as communicating between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

Most of the existing legal metrological verification mechanisms and water meter production enterprises adopt a serial water meter verification device, namely, a plurality of measured water meters with the same model and specification are installed on a device measurement section in series (no obvious mutual influence between the front water meter and the rear water meter is ensured), water passes through each measured water meter and a metering standard device in sequence when the indication error of the water meter is verified, and the indication error of the measured water meter is obtained by comparing the volume indication value of each water meter in a verification time period with the actual volume of the standard device. The detection time is greatly reduced by connecting the detected meters in series and detecting the meters simultaneously. Generally speaking, the number of the series water meters is between 2 and 10, and the number of the series water meters cannot exceed 10 due to the limitation of site space and the lift of a circulating water pump of the calibrating device. In order to further improve the efficiency of water meter verification, the invention provides a serial-parallel coupling type multi-station water meter verification device and method.

Specifically, referring to fig. 1, the serial-parallel coupling type multi-station water meter calibrating device provided in this embodiment mainly includes N channels, where the N channels are connected in parallel and converged and connected to a workload meter; that is, after the N channels are connected in parallel, the water flow of the channels will be converged into the workload device.

Each channel comprises a water inlet valve and a flow regulating valve, wherein n detected water meters are connected and installed in a pipeline between the water inlet valve and the flow regulating valve, namely, the detected water meters are connected in series in each channel during actual verification application; the water outlet end of the regulating valve is connected with the standard meter, and the water outlet end of the standard meter is connected with the workload meter, so that the water flow passing through the detected water meter can be regulated through the regulating valve.

And each detected water meter and the standard meter are connected with the controller, and the controller is used for receiving the verification signals of each detected water meter and the standard meter so as to calculate the volume indication value and the actual volume of the water meter flowing through the detected water meter.

The work load device comprises an electronic scale and a collecting container arranged on the electronic scale, and the collecting container is connected with a water drain valve;

wherein N and N are integers greater than or equal to 1; in the present embodiment, 1. ltoreq. N.ltoreq.4 and 1. ltoreq. n.ltoreq.10 are preferred.

The series-parallel coupling type multi-station water meter calibrating device provided by the embodiment uses a high-precision electronic scale and a standard meter as a main standard device, automatically acquires the actual volume of flowing water meters, and can calibrate a plurality of water meters with the same specification and model simultaneously through series-parallel coupling, namely, a measuring section of the calibrating device is provided with a plurality of paths of calibrating channels, each channel is connected with a plurality of to-be-tested water meters in series, and the number of the water meters of each channel is the same, so that the resistance losses of the channels are basically consistent; the method can be used for detecting the water meter according to the drinking cold water meter detection regulation (JJG 162-2019) by adopting a reversing method (a metering standard adopts an electronic scale) and a flow time method (the metering standard adopts a standard table). The measurement and control controller simultaneously receives the acquired signals of the electronic scale and the standard meters of all channels and calculates the actual volume of the water meter to be measured flowing through; obtaining volume indicating values of the flowing water meters according to signals or artificial readings of each detected meter of each channel, and comparing the two volume values to calculate indicating value errors of each detected water meter; the standard meter can also be used as an instantaneous flow indicator to display water flow in real time and provide a basis for judging whether the flow reaches the flow of a verification point, 5-40 water meters with the same specification can be verified at one time, verification efficiency is improved, and verification time is saved.

As an improvement of the series-parallel coupling type multi-station water meter calibrating device, a water drain valve of the collecting container is connected to a water tank, and water in the water tank is transmitted to a water inlet valve of each channel through a water pump. Therefore, water can be recycled through the water pump, so that waste of water is avoided. In addition, in order to keep the water pressure stable, a pressure stabilizing container is connected and installed between the water outlet end of the water pump and the water inlet valve.

In addition, in order to facilitate the installation of the detected water meters, meter clamping devices are further installed in each channel and used for clamping the n detected water meters.

Correspondingly, the embodiment further provides a serial-parallel coupling type multi-station water meter calibrating method, based on the serial-parallel coupling type multi-station water meter calibrating device, when the calibration is performed, the to-be-tested water meter needs to be installed at the installation position of each channel in advance, and the method specifically comprises the following steps:

calibration of common flow points:

the method comprises the following steps of (1) verifying a common flow point of the water meter of the channel 1, verifying the water meter by adopting an electronic scale and a reversing method, and operating according to the following procedures: 1) opening the water inlet valve 1, and closing other water inlet valves connected in parallel; 2) water is introduced within the rated flow range of the detected water meter, and air in the detected water meter and in the pipeline of the channel 1 of the detecting device is removed; 3) adjusting the flow of the 1 st channel to the flow value (0.9Q) of the common flow point₃～Q₃) And keep stable, and make the work load device (measure the standard device) in the work waiting state; 4) the detected water meter indicating device is in a motion state, reading the reading of the detected water meter, synchronously starting the commutator, and guiding the water flow to the collecting container; 6) after the detected water meter flows for a specified time or the water consumption is detected, the commutator is synchronously started to lead the water flow away when the reading of the detected water meter is read, and the water flow is not led to the collecting container any more; 7) and calculating the indicating value of the volume flowing through the detected water meter, reading the reading of the electronic scale, calculating the actual volume flowing through the detected water meter (the volume of the water collected in the collecting container is the actual volume of the flowing water meter), and comparing the 2 volume values to calculate the indicating value error of the 1 st channel water meter at the common flow detection point.

And finally, referring to the steps, sequentially completing the verification of the common flow points of the water meters of other channels until the verification of the common flow points of all the channels is completed.

And (3) calibrating the dividing flow points of all the channel water meters:

the standard meter of each channel adopts the standard meter of the corresponding channel, adopts the flow time method to carry out the water meter verification, and operates according to the following procedures: 1) opening water inlet valves of all the channels; 2) introducing water within the rated flow range of the detected water meter, and removing air in the detected water meter and the pipeline of the detection device;3) adjusting the flow of each channel to a demarcation flow point flow value (Q)₂～1.1Q₂) And keeping stable, and making each channel standard meter in a working waiting state, and making the verification signal of each channel detected water meter in a normal output state; 4) the calibrating device starts a measuring instruction, so that the controller synchronously receives signals of the standard meters of each channel and calibrating signals of the water meter to be detected, and when the synchronous requirements cannot be met, the controller measures time corresponding to the signals of the standard meters of each channel so as to correct the actual volume measured by the standard meters of each channel to the volume consistent with the reading time of the water meter according to two time differences; 5) after the detected water meter flows through the specified detection water consumption, the detection device starts a measurement stopping instruction, so that a controller of the device stops receiving the standard meter signal and the detection signal of the detected water meter and stops measuring time; 6) and calculating the volume indicating value flowing through the meter according to the signal of each detected water meter of each channel, integrating the flow signal of the standard meter corresponding to each channel between the verification starting time and the verification ending time of the detected water meter to serve as the actual volume flowing through each detected water meter, and calculating the indicating value error of each detected water meter at the boundary flow verification point.

And (3) carrying out verification on the minimum flow points of all the channel water meters:

the standard meter of each channel adopts the standard meter of the corresponding channel, adopts the flow time method to carry out the water meter verification, and operates according to the following procedures: 1) opening water inlet valves of all the channels; 2) introducing water within the rated flow range of the detected water meter, and removing air in the detected water meter and the pipeline of the detection device; 3) adjusting the flow of each channel to a minimum flow point flow value (Q)₁～1.1Q₁) And keeping stable, and making each channel standard meter in a working waiting state, and making the verification signal of each channel detected water meter in a normal output state; 4) the calibrating device starts a measuring instruction, so that a controller of the device synchronously receives signals of the standard meters of each channel and calibrating signals of the water meter to be detected, and when the synchronous requirements cannot be met, the controller measures time corresponding to the signals, so that the actual volume measured by the standard meters of each channel is corrected to the volume consistent with the reading time of the water meter according to two time differences; 5) the calibrating device is started after the water meter to be detected flows through the specified water consumption for calibrationStopping the measurement instruction, stopping the controller of the device from receiving the standard meter signal and the verification signal of the water meter, and stopping measuring time; 6) and calculating the volume indicating value flowing through the meter according to the signal of each detected water meter of each channel, integrating the flow signal of the standard meter corresponding to each channel between the detection starting time and the detection ending time of each detected water meter to serve as the actual volume flowing through each detected water meter, and calculating the indicating value error of each detected water meter at the minimum flow detection point.

In summary, compared with the prior art, the invention has the following technical advantages:

1. the high-precision electronic scale and the standard meter are used as a main standard device to automatically collect the actual volume of the flowing water meter, and a plurality of water meters with the same specification and model can be simultaneously detected in a series-parallel coupling mode, namely, a measuring section of the detecting device is provided with a plurality of detecting channels, each channel is connected with a plurality of detected water meters in series, and the number of the water meters of each channel is the same, so that the resistance losses of the channels are basically consistent; the method can be used for detecting the water meter according to the drinking cold water meter detection regulation (JJG 162-2019) by adopting a reversing method (a metering standard adopts an electronic scale) and a flow time method (the metering standard adopts a standard table). The measurement and control controller simultaneously receives the acquired signals of the electronic scale and the standard meters of all channels and calculates the actual volume of the water meter to be measured flowing through; obtaining volume indicating values of the flowing water meters according to signals or artificial readings of each detected meter of each channel, and comparing the two volume values to calculate indicating value errors of each detected water meter; the standard meter can also be used as an instant flow indicator to display water flow in real time and provide a basis for the measurement and control software to judge whether the flow reaches the flow of the verification point.

2. When the demarcation flow point and the minimum flow point are detected, the circulating water pump can simultaneously meet the water flow supply requirement of each channel because 2 flows only have one tenth or even one thousandth of the common flows, and can rapidly and accurately adjust the water flow of each channel to reach the flow value of the detection point and keep stable by combining with the flow adjusting valve, namely the flow value of each channel is stabilized at Q when the demarcation flow point is detected₂～1.1Q₂When the minimum flow point is detected, the flow value of each channel is stabilized at Q₁～1.1Q₁. Therefore, the water meter of all channels can be simultaneously operatedAnd (3) calibrating the demarcation flow point (or the minimum flow point), wherein each channel metering standard device adopts a standard meter of a corresponding channel, and a flow time method is adopted for calibrating the water meter. By adding the verification channel, the verification time of the water meter boundary flow point and the minimum flow point is greatly reduced, and the verification time of the 2 flow points is far longer than that of the common flow points, so that the verification efficiency is greatly improved in a comprehensive manner, the time cost is saved, the verification work is accurate and efficient, and reference is provided for improving the verification efficiency of domestic legal metrological verification mechanisms and water meter production enterprises.

3. The existing calibrating device can be conveniently transformed into multiple channels at low cost, each channel only needs to be additionally provided with 1 meter clamping device, a water inlet valve, a flow regulating valve and a 0.2-level standard meter, and a calibrating and measuring system is optimized at the same time, so that the measuring and measuring system can simultaneously control, record, calculate and generate a calibrating certificate for calibrating the multi-channel water meter. Therefore, the method and the device for calibrating the series-parallel coupling type multi-station water meter are simple, efficient, stable, reliable, low in cost and easy to install, and are worthy of great popularization and application.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.