CN117168582A

CN117168582A - Calibration method, system and storage medium of flow meter

Info

Publication number: CN117168582A
Application number: CN202311124152.8A
Authority: CN
Inventors: 裘黎萍
Original assignee: Hangzhou Zhongpei Electronic Co ltd
Current assignee: Hangzhou Zhongpei Electronic Co ltd
Priority date: 2023-09-01
Filing date: 2023-09-01
Publication date: 2023-12-05

Abstract

The application provides a method, a system and a storage medium for calibrating a flow meter, wherein the method comprises the following steps: acquiring a current given test flow value, determining an initial calibration coefficient of each calibrated flow instrument based on the initial flow value corresponding to the test flow value and the initial flow value and a preset initial coefficient of each calibrated flow instrument, and transmitting the initial calibration coefficient to the corresponding calibrated flow instrument; receiving a primary calibration signal, and acquiring a standard flow value of a corresponding standard meter and an actual flow value corresponding to each calibrated flow meter based on the primary calibration signal; judging whether the standard flow value is in a stable state, if so, determining a phase calibration result corresponding to each calibrated flow meter based on the standard flow value and the corresponding actual flow value; and judging whether the test flow value is the last test flow value of the calibration work, if so, generating a final calibration result of each calibrated flow instrument based on the calibration results of all stages. The application can improve the calibration efficiency.

Description

Calibration method, system and storage medium of flow meter

Technical Field

The present application relates to the field of instrument calibration technologies, and in particular, to a method, a system, and a storage medium for calibrating a flow meter.

Background

The flow meter is one of the large-scale meters in the process automation meters and devices, is widely applied to various fields of national economy such as metallurgy, electric power, coal, chemical industry, food, medicine, agriculture, daily life of people and the like, and is an important tool for developing industrial and agricultural production, saving resources, improving product quality and improving economic benefit and management level. When the flow meter is inaccurate in measurement, the flow meter is heavy, the flow meter can be out of control in the production process, so that the safety problem is caused, and the production line cannot be used normally later; the light weight results in increased production cost or the quality of the finished product produced cannot meet the requirements of customers. Therefore, the flow meter needs to complete calibration before being put into use, and only flow meters with qualified calibration are qualified to be put into use in the production line.

At present, a calibration system consisting of a reservoir, a water pump, a pressure stabilizing tank, a meter clamping device, a calibration table, a pipeline, a weighing container, a weighing device and a controller is generally adopted to complete the calibration work of the flow meter. The meter clamping device is arranged on the calibration table and used for fixing the calibrated flow meter. Under the action of a water pump, water in the reservoir flows into the surge tank through the pipeline, after high-frequency fluctuation is eliminated through the surge tank, water flowing out of the surge tank flows into the weighing container through the pipeline sequentially through one end of the meter clamping device in the calibration table, the calibrated flow meter, the other end of the meter clamping device and the pipeline. The weighing container is sent to the weighing device, the weighing device weighs the weight of water to obtain a weighing value, and the weighing value is sent to the controller, so that the controller can complete a set of calibration work of the calibrated flowmeter at the current flow point according to the received weighing value and the flow value sent by the calibrated flowmeter.

The calibration work of the calibrated flow meter can be completed only by completing the calibration work of a plurality of different flow points. However, in order to make the error of the weighing value obtained by the weighing device smaller, the weighing container needs to store a certain weight of water, and then the water in the weighing container can be conveyed to the weighing device, so that a great amount of time is necessary to be spent on storing a certain weight of water in the weighing container, a great amount of time is necessary to be spent on completing the calibration work of the current flow point once, a great amount of time is necessary to be spent on completing the calibration work of one flow meter, and the calibration efficiency is lower.

Disclosure of Invention

In order to improve the calibration efficiency of a flow meter, the embodiment of the application provides a calibration method, a system and a storage medium of the flow meter.

In a first aspect, the present embodiment provides a method for calibrating a flow meter, where the method includes:

acquiring a current given test flow value, determining an initial calibration coefficient of each calibrated flow meter based on the initial flow value corresponding to the test flow value, the corresponding initial flow value and a preset initial coefficient, and sending the initial calibration coefficient to the corresponding calibrated flow meter;

Receiving a primary calibration signal sent by the calibrated flow meter based on the primary calibration coefficient, and acquiring a standard flow value of a corresponding standard meter and an actual flow value corresponding to each calibrated flow meter based on the primary calibration signal;

judging whether the standard flow value is in a stable state, if so, determining a phase calibration result corresponding to each calibrated flow meter under the test flow value based on the standard flow value and the corresponding actual flow value;

and judging whether the test flow value is the last test flow value of the calibration work, if so, generating a final calibration result of each calibrated flow instrument based on the stage calibration results corresponding to all the test flow values.

In some of these embodiments, the unique determined initial coefficients for the same model of flow meter, and determining the initial calibration coefficient for each calibrated flow meter based on the test flow value and the corresponding initial flow value and the preset initial coefficients comprises:

subtracting the test flow value from the initial flow value corresponding to the same calibrated flow meter and dividing the test flow value to obtain an initial error of each calibrated flow meter;

Dividing the initial coefficient corresponding to the same calibrated flow meter by the sum of the initial error and the value one to obtain the initial calibration coefficient of each calibrated flow meter.

In some of these embodiments, determining whether the standard flow value is in a steady state comprises:

acquiring initial time corresponding to the standard flow value and monitoring time corresponding to the current monitoring time, judging whether all the standard flow values in the time difference fall into a preset flow range corresponding to the test flow value when the time difference between the monitoring time and the initial time is not smaller than the preset time, and if so, keeping the standard flow values in a stable state;

if at least one does not fall, the standard flow value is not in a steady state.

In some of these embodiments, the method further comprises:

if the standard flow value is not in a stable state, acquiring a reference time corresponding to the last time that the standard flow value does not fall into a corresponding preset flow range in the time difference, updating the initial time to the reference time, and continuously monitoring whether the time difference between the monitoring time corresponding to the current time and the initial time is not smaller than the preset time.

In some of these embodiments, determining a phase calibration result for each flow meter at the test flow value based on the standard flow value and the corresponding actual flow value comprises:

subtracting the standard flow value from each actual flow value and dividing the standard flow value by the standard flow value to obtain an adjustment error corresponding to each calibrated flow meter;

judging whether each adjustment error falls within a preset allowable error or not respectively, and if so, judging that the stage calibration result of the flow meter corresponding to the adjustment error is qualified;

if the flow meter does not fall into the flow meter, the phase calibration result of the flow meter corresponding to the adjustment error is unqualified.

In some of these embodiments, generating a final calibration result for each calibrated flow meter based on the phase calibration results for all test flow values includes:

judging whether the calibration results of all stages corresponding to the same calibrated flow meter are qualified or not respectively, and if so, judging that the final calibration result of the calibrated flow meter is qualified;

and if at least one of the flow meters is failed, the final calibration result of the calibrated flow meter is failed.

In some of these embodiments, the method further comprises:

If the test flow value is not the last test flow value of the calibration work, continuing to acquire the test flow value positioned next to the test flow value, and each calibrated flow meter is based on the initial flow value corresponding to the next test flow value.

In some of these embodiments, if the test flow value is not the last test flow value of the calibration effort further comprises:

generating a flow valve action instruction corresponding to the test flow value, and sending the flow valve action instruction to a corresponding flow valve, wherein the flow valve action instruction comprises a closing instruction representing that a current valve corresponding to the test flow value needs to be closed and an opening instruction representing that a next valve corresponding to a next test flow value positioned in the test flow value needs to be opened.

In a second aspect, the present embodiment provides a calibration system for a flow meter, the system comprising: the system comprises a primary calibration module, a signal sending module, a flow value acquisition module, a state monitoring module, a recalibration module and a calibration result generation module; wherein,

the primary calibration module is used for obtaining a current given test flow value, determining a primary calibration coefficient of each calibrated flow meter based on the initial flow value corresponding to the test flow value, the corresponding initial flow value and a preset initial coefficient;

The signal transmitting module is used for transmitting the primary calibration coefficient to a corresponding calibrated flow meter;

the flow value acquisition module is used for receiving a primary calibration signal sent by the calibrated flow meter based on the primary calibration coefficient, acquiring a standard flow value of a corresponding standard meter based on the primary calibration signal, and an actual flow value corresponding to each calibrated flow meter;

the state monitoring module is used for judging whether the standard flow value is in a stable state or not;

the recalibration module is used for determining a stage calibration result corresponding to each calibrated flow meter under the test flow value based on the standard flow value and the corresponding actual flow value if the recalibration module is in the process;

and the calibration result generation module is used for judging whether the test flow value is the last test flow value of the calibration work, and if so, generating a final calibration result of each calibrated flow instrument based on the stage calibration results corresponding to all the test flow values.

In a third aspect, an embodiment of the present application provides a storage medium having stored thereon a computer program executable on a processor, the computer program implementing a method of calibrating a flow meter according to the first aspect when executed by the processor.

By adopting the method, the application firstly obtains the current given test flow value and the initial flow value corresponding to each calibrated flow meter based on the test flow value. And then, determining the initial calibration coefficient of each calibrated flow meter based on the test flow value, the corresponding initial flow value and the preset initial coefficient, so that the flow meter is firstly adjusted in a mode of simply and directly improving the measurement accuracy of the flow meter, the primary calibration of the current calibrated flow meter is finished, and the serious inaccuracy of the measurement of the calibrated flow meter in the process of formally running the subsequent calibration equipment with the current given test flow value is reduced.

After the initial calibration of each calibrated flow meter is finished, continuously using a standard meter and checking whether each calibrated flow meter is qualified in measurement accuracy. The method comprises the steps of firstly receiving a primary calibration signal sent by a calibrated flow meter based on a primary calibration coefficient, and obtaining a standard flow value of a corresponding standard meter and an actual flow value corresponding to each calibrated flow meter based on the primary calibration signal.

And judging whether the standard flow value is in a stable state, and determining a phase calibration result corresponding to each calibrated flow meter under the test flow value based on the standard flow value and the corresponding actual flow value only under the condition that the standard flow value is in the stable state. Therefore, the recalibration operation after the initial calibration at the stage corresponding to the test flow value can be completed only through 16s, and compared with the calibration operation completed by using the weighing device, the calibration device has the effect of saving time, thereby improving the calibration efficiency. If the flow meter is not smooth, the time of the s level is prolonged, and compared with the calibration of the flow meter by adopting the weighing device at present, the calibration work of the stage corresponding to the test flow value can be completed only by taking several tens of minutes, and the effect of saving time can be achieved, so that the calibration efficiency is improved.

And finally judging whether the test flow value is the last test flow value of the calibration work, and generating a final calibration result of each calibrated flow instrument based on the stage calibration results corresponding to all the test flow values only after the calibration work of the stages corresponding to all the test flow values is completed. Because the corresponding stage of each test flow value can play a time-saving effect, all calibration works of the batch of the calibrated flow meters can also play a time-saving effect compared with the use of the weighing device in the existing method through linear superposition, thereby achieving the purpose of improving the calibration efficiency.

Drawings

Fig. 1 is a block diagram of a calibration device to which the calibration method of a flow meter according to the present embodiment is applied.

Fig. 2 is a block diagram of a calibration method of a flow meter according to the present embodiment.

Fig. 3 is a block diagram of the initial calibration coefficients of each of the calibrated flow meters based on the test flow values and the corresponding initial flow values and the preset initial coefficients provided in the present embodiment.

FIG. 4 is a block diagram of the stage calibration results provided by the present implementation for determining the correspondence of each flow meter at a test flow value based on a standard flow value and a corresponding actual flow value.

Fig. 5 is a frame diagram of a calibration system of a flow meter according to the present embodiment.

Detailed Description

The present application will be described and illustrated with reference to the accompanying drawings and examples for a clearer understanding of the objects, technical solutions and advantages of the present application. However, it will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. It will be apparent to those having ordinary skill in the art that various changes can be made to the disclosed embodiments of the application and that the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the application. Thus, the present application is not limited to the embodiments shown, but is to be accorded the widest scope consistent with the scope of the application as claimed.

Embodiments of the application are described in further detail below with reference to the drawings.

A flow meter refers to a meter that measures the flow and/or the total amount of fluid over a selected time interval. In short, a meter for measuring the flow of fluid in a pipe or open channel. Fig. 1 is a block diagram of a calibration device to which the calibration method of a flow meter according to the present embodiment is applied. As shown in fig. 1, the calibration device comprises a reservoir, a water pump, a surge tank, a pipeline, a plurality of meter clamping devices, a calibration table, a controller, a plurality of flow valves and standard flow meters (hereinafter simply referred to as standard meters) corresponding to each flow valve one by one. The water outlet of the reservoir is in sealing connection with the water inlet of the water pump through a pipeline, and the water outlet of the water pump is in sealing connection with the inlet of the surge tank through a pipeline. According to the direction that water flows out from the cistern and passes through in proper order, defaulting the one end that has the water to pass through first in the calibration platform to be first end, defaulting the one end that has the water to pass through last in the calibration platform to be the second end, the export of surge tank passes through pipeline and marks the first end of platform and pass through pipeline sealing connection. The meter clamping device comprises a calibration table, a first meter clamping device, a second meter clamping device, a third meter clamping device, a … meter clamping device and a final meter clamping device, wherein a plurality of meter clamping devices are arranged on the calibration table, all meter clamping devices are sequentially connected through pipelines along the direction from the first end to the second end of the calibration table, the meter clamping device closest to the first end defaults to be the first meter clamping device according to the direction from the first end to the second end, and the subsequent meter clamping devices are sequentially the second meter clamping device, the third meter clamping device, the … meter clamping device and the final meter clamping device along the direction from the first end to the second end. The first end of the calibration table is also in sealing connection with the water inlet of the first meter clamping device through a pipeline, the water outlet of the first meter clamping device is in sealing connection with the water inlet of the second meter clamping device through a pipeline, the first end of the calibration table is sequentially in sealing connection with the water inlet of the second meter clamping device, and the water outlet of the meter clamping device is finally in sealing connection with the second end of the calibration table through a pipeline. Each meter clamping device can be provided with a flow meter which needs to be calibrated, so that the flow meter arranged on the meter clamping device can display the flow value flowing through the flow meter in real time.

In addition, when the flow meter is not installed on the meter clamping device, water at the first end of the calibration table can normally flow to the second end of the calibration table through the pipeline and the meter clamping device in sequence. The second end of the calibration table is connected with the water inlet of each flow valve through a pipeline respectively, and the connection between the second end of the calibration table and each flow valve is correspondingly provided with a corresponding pipeline. The water outlet of each flow valve flows into the reservoir through a pipeline, and a standard meter is arranged on the pipeline between the water outlet of each flow valve and the reservoir. The controller may establish communication with the devices in the calibration apparatus by wireless or wired means.

According to the calibration equipment, the working flow of the calibration equipment is that water in the reservoir flows into the pipeline from the reservoir under the action of the water pump, then sequentially passes through the water pump, the surge tank, each meter clamping device on the calibration table, a certain flow valve and a corresponding standard meter, and finally flows into the reservoir from the pipeline where the standard meter is located, so that the closed-loop operation of the device is formed. And each device in the calibration equipment is in communication connection with the controller, so that the related information in the working process of the calibration equipment can be sent to the controller, and the related information sent by the controller can be received. The number of the meter clamping devices arranged on the control console can be determined according to practical situations, but the number of the meter clamping devices is an integer not smaller than one. If the number of the meter clamping devices is zero, the flow meters to be calibrated cannot be installed, and the calibration work of the flow meters cannot be realized. Each meter clamping device is not required to be provided with a flow meter to be calibrated, and whether the flow meter to be calibrated is required to be provided on each meter clamping device can be determined according to actual conditions.

Before the calibration of the flow meter, the flow meter to be calibrated needs to be installed on the meter clamping devices, so that at most one flow meter to be calibrated is installed on each meter clamping device. And then calibrating all the flow meters arranged on the meter clamping device at the same time, so that the calibration of a plurality of flow meters can be completed at the same time. When the flow meter is calibrated, the corresponding calibration work is completed under the action of a plurality of test flow values, and finally, the final calibration result of each flow meter arranged on the meter clamping device is obtained according to the results of all calibration works corresponding to all the test flow values. Fig. 2 is a block diagram of a calibration method of a flow meter according to the present embodiment. As shown in fig. 2, a calibration method of a flow meter includes the following steps:

step S100, obtaining a current given test flow value, determining an initial calibration coefficient of each calibrated flow meter based on the initial flow value corresponding to the test flow value and the initial flow value and a preset initial coefficient, and sending the initial calibration coefficient to the corresponding calibrated flow meter.

The above-described test flow value characterizes the flow value that the reservoir needs to give to the flow meter to be calibrated. The controller end stores a plurality of ordered test flow values, and the controller needs to sequentially control the water flow values of the water reservoirs to the flow meters to be calibrated according to the ordered test flow values, namely, each time a batch of calibration work of the flow meters mounted on the meter clamping device is completed, the calibration work of the stage of the test flow values needs to be completed by using the first test flow value, then the calibration work of the other stage is completed by using the second test flow value, and the calibration work of the last stage is completed by using the last test flow value. When the calibration work of a certain stage is completed, the flow value given to the flow meter to be calibrated is a fixed value. The flow meter arranged on the meter clamping device is the calibrated flow meter. The initial flow value represents the flow value measured by the calibrated flow meter, and each calibrated flow meter can send the flow value measured by the calibrated flow meter to the controller in a wireless or wired mode.

The controller can obtain the current given test flow value by checking the test flow value of the current water feeding pump. On the other hand, the controller obtains an initial flow value corresponding to each calibrated flow meter based on the test flow value by receiving the measured flow value sent by each calibrated flow meter. Each calibrated flow meter is corresponding to a uniquely determined position number, and the position number is consistent with the position number of the meter clamping device where the calibrated flow meter is located. Such that each initial flow value corresponds to a position number.

In addition, the flow meters of the same model are all corresponding to the uniquely determined initial coefficients, the initial coefficients are uniformly set when the flow meters of the model leave the factory, and the initial coefficients influence the accuracy of measurement of the flow meters. The initial coefficient of each type of flow meter is stored in the controller, after the initial flow value corresponding to the current given test flow value and each calibrated flow meter under the condition of the test flow value is obtained, the controller determines the initial calibration coefficient of each calibrated flow meter based on the test flow value, the corresponding initial flow value and the preset initial coefficient, and sends the initial calibration coefficient to the corresponding calibrated flow meter in a wireless or wired mode, so that each calibrated flow meter replaces the initial coefficient originally set by a factory according to the received initial calibration coefficient. There are many factors that affect the inaccuracy of the flow meter measurement, with the initial coefficient being only one of them and being easily adjustable. The flow meter is adjusted in a mode of simply and directly improving the measurement accuracy of the flow meter, primary calibration of the current calibrated flow meter is completed, and the situation that the calibrated flow meter is seriously inaccurate in the process that the subsequent calibration equipment formally runs with the current given test flow value is reduced.

Fig. 3 is a block diagram of the initial calibration coefficients of each of the calibrated flow meters based on the test flow values and the corresponding initial flow values and the preset initial coefficients provided in the present embodiment. As shown in fig. 3, determining the initial calibration coefficient of each calibrated flow meter based on the test flow value and the corresponding initial flow value and the preset initial coefficient comprises the steps of:

step S101, the initial flow value corresponding to the same calibrated flow meter is subtracted by the test flow value and divided by the test flow value, so as to obtain the initial error of each calibrated flow meter.

Step S102, dividing the initial coefficient corresponding to the same flow meter to be calibrated by the sum of the initial error and the value one to obtain the initial calibration coefficient of each flow meter to be calibrated.

Each calibrated flow meter corresponds to a test flow value, an initial flow value, and an initial coefficient. The initial error of each flow meter to be calibrated can be obtained by substituting the test flow value and the initial flow value corresponding to each flow meter to be calibrated into a calculation formula of initial error= (initial flow value-test flow value)/test flow value, wherein each initial error corresponds to a position number. After the initial error is obtained, the initial coefficient and the initial error corresponding to each flow meter to be calibrated are respectively substituted into a calculation formula of initial calibration coefficient=initial coefficient/(initial error+1), so that the initial calibration coefficient of each flow meter to be calibrated can be obtained. The controller performs simple calculation by using the two calculation formulas to complete quick calculation of the initial calibration coefficient of each calibrated flow meter, and sends the initial calibration coefficient to the corresponding calibrated flow meter, so that the calibrated flow meter quickly responds and adjusts the initial coefficient when leaving the factory respectively, the waiting time of subsequent calibration work is reduced, and the influence on the subsequent calibration work is reduced. After the initial calibration of each calibrated flow meter is finished, continuously using a standard meter and checking whether each calibrated flow meter is qualified in measurement accuracy.

Step S200, receiving the primary calibration signals sent by the calibrated flow meters based on the primary calibration coefficients, and acquiring standard flow values of the corresponding standard meters based on the primary calibration signals, and the actual flow value corresponding to each calibrated flow meter.

The standard flow value represents the flow value measured by the standard meter, and the actual flow value represents the flow value measured by the calibrated flow meter. After the initial coefficient of the calibrated instrument when leaving the factory is corrected to the initial calibration coefficient, the calibrated instrument automatically sends an initial calibration signal to the controller. The controller obtains the standard flow value sent by the standard table corresponding to the current given test flow value and the flow value sent by each calibrated flow meter based on the initial calibration signal when the initial calibration signal sent by the calibrated meter is received.

The number of the flow valves and the number of the standard tables are the same as the number of the test flow values stored by the controller, and one test flow value corresponds to the uniquely determined flow valve and the standard table. When the calibration device works at the stage of the current given test flow value, the flow valve corresponding to the current given test flow value is in an open state, and other flow valves are in a closed state, so that water flowing out of the second end of the calibration table only flows into the flow valve corresponding to the current given test flow value, and the corresponding standard table only has the corresponding standard flow value. Similarly, when the calibration device works in the stage of other test flow values, the flow valve corresponding to the test flow value is in an open state, and the other flow valves are in a closed state. Through setting up a plurality of flow valves and corresponding standard table, the frequency of flow regulation can furthest be reduced to also can improve the efficiency of demarcation.

During operation of the calibration device, each of the calibrated flow meters and each of the standard tables automatically transmit the respective measured flow values to the controller and are stored in a memory unit in the controller. When the controller receives the initial calibration signal, the controller can acquire the standard flow value sent by the standard table corresponding to the current given flow value and the flow value sent by each calibrated flow meter by retrieving the information of the storage unit.

And step S300, judging whether the standard flow value is in a stable state, and if so, determining a phase calibration result corresponding to each calibrated flow meter under the test flow value based on the standard flow value and the corresponding actual flow value.

The standard meter is a flow meter capable of accurately obtaining a flow value, and the accuracy of the standard meter can be ensured by carrying out calibration on the standard meter at an irregular period. The standard flow value measured by the standard table is in a stable state, so that the standard flow value obtained by the standard table has reference significance. Therefore, before the calibration result of the stage corresponding to each calibrated flow meter under the current given flow test value is determined, it is required to determine whether the current acquired standard flow value is in a stable state. Only if the currently acquired standard flow value is in a stable state, the stage calibration result corresponding to each calibrated flow meter under the current given test flow value can be further determined. Wherein, judging whether the standard flow value is in a stable state comprises the following steps:

Step S301, obtaining an initial time corresponding to the received standard flow value and a monitoring time corresponding to the current monitoring time, and judging whether all the standard flow values in the time difference fall into a preset flow range corresponding to the tested flow value when the time difference between the time to be monitored and the initial time is not smaller than the preset time, if so, the standard flow values are in a stable state.

In step S302, if at least one of the flow values does not fall, the standard flow value is not in a stable state.

The initial time is the time when the controller receives the initial calibration signal. The controller is also provided with a clock unit, and the controller records the time of receiving the initial calibration signal when receiving the initial calibration signal, and stores the time in a storage unit in the controller in a form corresponding to the current given test flow value, so that the initial time corresponding to the received standard flow value can be obtained by checking the storage unit. In addition, the monitoring time corresponding to the current time can be monitored through checking the clock unit, the monitoring time is subtracted from the initial time in real time to obtain time differences between the monitoring time and the initial time, each obtained time difference is compared with the preset time, if the time difference is smaller than the preset time, the fact that the preset time is not spaced is indicated, the detection time corresponding to the current time is continuously monitored until the time difference is not smaller than the preset time. If the time difference is not smaller than the preset time, indicating that the time has elapsed from the moment of receiving the initial calibration signal, theoretically, the standard flow values obtained by the standard table should be in a stable state, and at this time, further determining whether all the standard flow values obtained by the standard table are actually in a stable state by comparing all the standard flow values received in the time difference with the preset flow range corresponding to the currently given test flow value. The preset flow range is an up-and-down fluctuation range formed by taking the test flow value as a center, wherein the up-and-down fluctuation value can be determined according to actual conditions. The preset time can be determined according to the actual situation of the calibration device, and the preset time is selected to be 16s in the embodiment.

If all the standard flow values in the time difference fall into the preset flow range corresponding to the test flow value, the standard flow value is in a stable state. If at least one standard flow value in all the standard flow values in the time difference does not fall into the preset flow range corresponding to the test flow value, the standard flow value is indicated to be in a stable state. Therefore, compared with the method which only depends on the time to judge whether the standard flow value acquired by the standard table is in a stable state, the method has the advantage that the result of judging whether the standard flow value is in the stable state is more convincing and realistic.

When the standard flow value is determined to be in a stable state, the controller determines a phase calibration result corresponding to each calibrated flow meter under the test flow value based on the standard flow value and the corresponding actual flow value. FIG. 4 is a block diagram of the stage calibration results provided by the present implementation for determining the correspondence of each flow meter at a test flow value based on a standard flow value and a corresponding actual flow value. As shown in fig. 4, determining the phase calibration result corresponding to each flow meter at the test flow value based on the standard flow value and the corresponding actual flow value includes the steps of:

Step S301, subtracting the standard flow value from each actual flow value and dividing the standard flow value by the standard flow value to obtain the corresponding adjustment error of each calibrated flow meter.

Step S302, judging whether each adjustment error falls within a preset allowable error or not, and if so, judging that the stage calibration result of the flow meter corresponding to the adjustment error is qualified.

Step S303, if not, the phase calibration result of the flow meter corresponding to the adjustment error is not qualified.

Each calibrated flow meter corresponds to an actual flow value and a standard flow value. The actual flow value and the standard flow value corresponding to each calibrated flow meter are respectively substituted into a calculation formula of adjustment error= (actual flow value-standard flow value)/standard flow value, and the adjustment error of each calibrated flow meter can be obtained. And then, judging whether each adjustment error falls into an allowable error or not respectively, and if so, judging that the stage calibration result of the calibrated flow meter corresponding to the adjustment error at the stage of the current given test flow value is qualified. If the current test flow value does not fall into the preset reference flow value, the stage calibration result of the calibrated flow meter corresponding to the adjustment error is not qualified. The allowable error is a range, and a specific value corresponding to the allowable error can be determined according to industry standards.

In addition, if the standard flow value is not in a stable state, acquiring a reference time corresponding to the last standard flow value in the time difference, which does not fall into a corresponding preset flow range, updating the initial time to the reference time, and continuously monitoring whether the time difference between the monitoring time corresponding to the current time and the initial time is not less than the preset time.

And under the condition that the standard flow value is still in an unstable state after the preset time is counted from the initial time, acquiring the standard flow value which does not fall into the corresponding preset flow range in the corresponding time difference and the marking time corresponding to the standard flow value. And determining the marking time closest to the current time in all marking times as reference time, updating the reference time by using initial time, and continuously monitoring whether the time difference between the monitoring time corresponding to the current time and the initial time is not less than preset time, so as to judge whether the standard flow value is in a stable state, entering the next step until the standard flow value is in the stable state, and determining a stage calibration result corresponding to each calibrated flow meter under the current given test flow value only under the condition that the standard flow value is in the stable state, thereby achieving the aim of indirectly ensuring the stage calibration result accuracy. Moreover, the recalibration operation after the initial calibration at the stage corresponding to the test flow value can be completed only through 16s smoothly, and compared with the calibration operation completed by using the weighing device, the calibration device has the effect of saving time, thereby improving the calibration efficiency. If the calibration is not smooth, the calibration is only prolonged by s-level time, and compared with the calibration which can only be completed in a stage corresponding to a test flow value in a few tens of minutes at present, the calibration has the effect of saving time, thereby improving the calibration efficiency.

And step S400, judging whether the test flow value is the last test flow value of the calibration work, if so, generating a final calibration result of each calibrated flow instrument based on the stage calibration results corresponding to all the test flow values.

When the phase calibration results corresponding to all calibrated flow meters of one phase are obtained, comparing the current given test flow value with the last test flow value in the stored ordered test flow values at the same time, and if the current given test flow value is equal to the last test flow value in the stored ordered test flow values, indicating that the current given test flow value is the last test flow value of the calibration work; if the current given test flow value is not equal to the last test flow value in the stored plurality of ordered test flow values, the current given test flow value is not the last test flow value of the calibration work.

When the current given test flow value is the last test flow value of the calibration work, the batch of calibrated flow meters mounted on the meter clamping device completes the stage calibration work corresponding to all the test flow values, and the final calibration result of each calibrated flow meter can be generated based on the stage calibration results corresponding to all the test flow values. Wherein generating a final calibration result for each calibrated flow meter based on the phase calibration results for all test flow values comprises the steps of:

And step S401, judging whether the calibration results of all stages corresponding to the same calibrated flow meter are qualified or not respectively, and if so, judging that the final calibration result of the calibrated flow meter is qualified.

In step S402, if at least one of the flow meters is failed, the final calibration result of the calibrated flow meter is failed.

By checking whether the calibration results of all stages of the same calibrated flow meter are all qualified, if so, the final calibration result of the calibrated flow meter is qualified. If at least one of the calibrated flow meters is not acceptable, the final calibration result of the calibrated flow meter is not acceptable. And sequentially, obtaining the final calibration result of each calibrated flow meter on the calibration table by adopting the mode. Because the corresponding stage of each test flow value can play a time-saving effect, all calibration works of the batch of the calibrated flow meters can also play a time-saving effect compared with the use of the weighing device in the existing method through linear superposition, thereby achieving the purpose of improving the calibration efficiency.

When the current given test flow value is not the last test flow value of the calibration work, the calibration work of the stage corresponding to all the test flow values is not completed by the batch of calibrated flow meters installed on the meter clamping device, the next test flow value of the current given test flow value needs to be continuously acquired, and each calibrated flow meter is based on the initial flow value corresponding to the next test flow value. And will not be described in detail herein.

In addition, if the current given test flow value is not the last test flow value of the calibration operation, the method further comprises: generating a flow valve action instruction corresponding to the test flow value, and sending the flow valve action instruction to the corresponding flow valve, wherein the flow valve action instruction comprises a closing instruction representing that the current valve corresponding to the test flow value needs to be closed and an opening instruction representing that the next valve corresponding to the next test flow value is positioned at the next test flow value.

And when the current given test flow value is not the last test flow value of the calibration work, the controller generates a flow valve action command comprising a closing command and an opening command, and sends the closing command to the flow valve corresponding to the current given test flow value to close the flow valve, and sends the opening command to the flow valve corresponding to the next test flow value of the current given test flow value to open the flow valve, so that preparation is made for the work of the stage corresponding to the next test flow value.

Fig. 5 is a frame diagram of a calibration system of a flow meter according to the present embodiment. As shown in fig. 5, a calibration system of a flow meter includes: the system comprises a primary calibration module, a signal sending module, a flow value acquisition module, a state monitoring module, a recalibration module and a calibration result generation module.

The primary calibration module is used for obtaining a current given test flow value, determining the primary calibration coefficient of each calibrated flow meter based on the initial flow value corresponding to the test flow value, the corresponding initial flow value and a preset initial coefficient. And the signal sending module is used for sending the initial calibration coefficient to the corresponding calibrated flow meter. The flow value acquisition module is used for receiving the primary calibration signals sent by the calibrated flow meters based on the primary calibration coefficients, acquiring standard flow values of the corresponding standard meters based on the primary calibration signals, and obtaining actual flow values corresponding to each calibrated flow meter. And the state monitoring module is used for judging whether the standard flow value is in a stable state or not. And the recalibration module is used for determining a stage calibration result corresponding to each calibrated flow meter under the test flow value based on the standard flow value and the corresponding actual flow value if the calibration result is in the stage calibration result. And the calibration result generation module is used for judging whether the test flow value is the last test flow value of the calibration work, and if so, generating a final calibration result of each calibrated flow instrument based on the stage calibration results corresponding to all the test flow values.

Other functions executed by the initial calibration module, the signal sending module, the flow value obtaining module, the state monitoring module, the recalibration module and the calibration result generating module and technical details of each function are the same as or similar to corresponding features in the calibration method of the flow meter described above, so that the description is omitted herein.

Embodiments of the present application provide a computer readable storage medium having a computer program stored thereon, which when run on a computer, enables the computer to perform the above-described aspects of a method embodiment of calibrating a flow meter.

It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein.

The foregoing is only a partial embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations are intended to be comprehended within the scope of the present application.

Claims

1. A method of calibrating a flow meter, the method comprising:

2. The method of claim 1, wherein the same model of flow meter corresponds to a uniquely determined initial coefficient, and wherein determining an initial calibration coefficient for each calibrated flow meter based on the test flow value and the corresponding initial flow value and a preset initial coefficient comprises:

3. The method of claim 1, wherein determining whether the standard flow value is in a steady state comprises:

4. A method according to claim 3, characterized in that the method further comprises:

5. The method of claim 1, wherein determining a phase calibration result for each flow meter at the test flow value based on the standard flow value and the corresponding actual flow value comprises:

6. The method of claim 5, wherein generating a final calibration result for each calibrated flow meter based on the phase calibration results for all test flow values comprises:

7. The method according to claim 1, wherein the method further comprises:

8. The method of claim 7, wherein if the test flow value is not the last test flow value of the calibration effort further comprises:

9. A calibration system for a flow meter, the system comprising: the system comprises a primary calibration module, a signal sending module, a flow value acquisition module, a state monitoring module, a recalibration module and a calibration result generation module; wherein,

10. A computer readable storage medium having stored thereon a computer program executable on a processor, wherein the computer program when executed by the processor implements a method of calibrating a flow meter according to any of claims 1 to 8.