CN115585871A - Combined type standard meter method flow standard device and using method - Google Patents

Abstract

The invention discloses a combined standard meter method flow standard device and its use method, and relates to the technical field of flow metering equipment. The main purpose is to provide a combined standard meter method flow standard device capable of improving the measurement accuracy and the upper limit of the flow range . The main technical solution of the present invention is: a combined standard meter method flow standard device, including: a measuring assembly, the first flow meter is arranged in the middle of the first pipeline, the first flow meter is connected to the first platform, the first valve The body is set between the first flowmeter and the second interface, the second flowmeter is set in the middle of the second pipeline, the second flowmeter is connected to the second platform, and the second valve body is set between the second flowmeter and the fourth Between the interfaces; connecting components, the two ends of the first connecting pipe are respectively detachably connected to the side of one end of the first pipeline and the second pipeline, and the two ends of the second connecting pipe are respectively detachably connected to the first pipeline and the second pipeline. The side of the other end of the second pipeline. The invention is mainly used for flow metering and calibration.

Description

A combined standard meter method flow standard device and using method

technical field

The invention relates to the technical field of flow metering equipment, in particular to a combined standard meter method flow standard device and a use method.

Background technique

Compared with traditional laboratory calibration, on-line calibration can more objectively reflect the measurement performance of the flowmeter under the actual application state. Therefore, in recent years, online calibration of flowmeters has gradually become the main direction and trend of flow measurement development, and more and more customers choose online calibration instead of sending to the laboratory for calibration. On-line calibration techniques and methods are concerned and discussed by metrology institutions and experts at all levels.

At present, the conventional online calibration method is to use an external clamp-on ultrasonic flowmeter installed outside the pipeline for flow measurement. Affected by many factors such as pipe material, wall thickness, medium, straight pipe length, and installation accuracy, the measurement accuracy of this method is low, generally less than 2%, and can only meet the calibration requirements of process control flow instruments. Calibration requires the preparation of devices with different measurement ranges, and the upper limit of the flow range of a single device is limited.

Contents of the invention

In view of this, the embodiment of the present invention provides a combined standard meter method flow standard device and its use method, the main purpose of which is to provide a combined standard meter method flow standard device that can improve the measurement accuracy and the upper limit of the flow range.

In order to achieve the above object, the present invention mainly provides the following technical solutions:

On the one hand, an embodiment of the present invention provides a combined standard meter method flow standard device, which includes:

A measuring assembly, the measuring assembly at least includes a first assembly and a second assembly, the first assembly includes a first platform, a first flow meter, a first pipeline and a first valve body, the two of the first pipeline The first port and the second port are set at the end, the first flow meter is set in the middle of the first pipeline, the first flow meter is connected to the first platform, and the first valve body is set in the middle of the first pipeline. Between the first flowmeter and the second interface, the second assembly includes a second platform, a second flowmeter, a second pipeline and a second valve body, and the two ends of the second pipeline are provided with the first Three ports and a fourth port, the second flow meter is set in the middle of the second pipeline, the second flow meter is connected to the second platform, and the second valve body is set on the second Between the flow meter and the fourth interface;

A connecting assembly, the connecting assembly includes a first connecting pipe and a second connecting pipe, both ends of the first connecting pipe are respectively detachably connected to one end side of the first pipeline and the second pipeline, and the first connecting pipe Both ends of the two connecting pipes are respectively detachably connected to the side surfaces of the other ends of the first pipeline and the second pipeline.

Further, one end of the first connecting pipe is connected to the first pipeline, and one end of the first connecting pipe is located between the first interface and the first flowmeter, the first The other end of the connecting pipe is connected to the second pipeline, and the other end of the first connecting pipe is located between the third interface and the second flowmeter.

Further, one end of the second connecting pipe is connected to the first pipeline, and one end of the second connecting pipe is located between the second interface and the first valve body, the second The other end of the connecting pipe is connected to the second pipeline, and the other end of the second connecting pipe is located between the fourth interface and the second valve body.

Further, the first pipeline includes a first sub-pipe and a second sub-pipe, both ends of the first flowmeter are detachably connected to the first sub-pipe and the second sub-pipe respectively.

Further, the second pipeline includes a third sub-pipe and a fourth sub-pipe, both ends of the second flowmeter are detachably connected to the third sub-pipe and the fourth sub-pipe respectively.

Further, the diameter of the first pipeline is larger than the pipeline of the second diameter.

Further, the connecting assembly further includes a first valve and a second valve, the first valve is arranged on the first connecting pipe, and the second valve is arranged on the second connecting pipe.

Further, the plugging head is connected to the first port, the second port, the third port and the fourth port respectively.

On the other hand, the embodiment of the present invention also provides a method for using a combined standard meter method flow standard device, the method includes the following steps:

Step 1: Choose to connect to the first interface or the third interface according to the caliber of the device under inspection;

Step 2: Connect the first interface or the third interface to the standard device in series, and use the standard device to calibrate the device according to the common flow points of the tested equipment, so that the indication error of each common flow point is ≤0.05%, and the expanded uncertainty U=0.05%, k=2;

Step 3: Connect the first interface or the third interface in series to the pipeline of the tested equipment, and run the tested equipment;

Step 4: Change the opening degree of the first valve body or the second valve body to adjust the instantaneous flow rate of the first component or the second component;

Step 5: Simultaneously collect the instantaneous flow or cumulative flow of the device under test, the first flowmeter and the second flowmeter through the control system:

Step 6: Calculate the indication error and repeatability of the instantaneous flow or cumulative flow of each common flow point of the tested equipment.

Further, in the step 5, the collection time of the control system is 30 seconds to 60 seconds, and the collection is repeated at least 3 times for each common flow point.

Compared with the prior art, the present invention has the following technical effects:

In the technical solution provided by the embodiment of the present invention, the function of the measurement component is to measure and calibrate the flow rate of the device under test. The measurement component includes at least a first component and a second component. The first component includes a first platform, a first flow meter, The first pipeline and the first valve body, the two ends of the first pipeline are provided with a first interface and a second interface, the first flowmeter is arranged in the middle of the first pipeline, the first flowmeter is connected to the first platform, and the second A valve body is arranged between the first flowmeter and the second interface, the second assembly includes a second platform, a second flowmeter, a second pipeline and a second valve body, and a third interface is arranged at both ends of the second pipeline and the fourth interface, the second flowmeter is arranged in the middle of the second pipeline, the second flowmeter is connected to the second platform, and the second valve body is arranged between the second flowmeter and the fourth interface; the function of the connecting assembly is Connecting the first assembly and the second assembly, the connection assembly includes a first connecting pipe and a second connecting pipe, the two ends of the first connecting pipe are respectively detachably connected to the side of one end of the first pipeline and the second pipeline, and the second connecting pipe The two ends of the pipe are detachably connected to the side of the other end of the first pipeline and the second pipeline respectively. Compared with the prior art, an external clip-on ultrasonic flowmeter is installed on the outside of the pipeline for flow measurement. Affected by many factors such as pipe material, wall thickness, medium, straight pipe length, and installation accuracy, the measurement accuracy of this method is low, generally less than 2%, and can only meet the calibration requirements of process control flow instruments. Calibration requires the preparation of equipment with different measurement ranges, and the upper limit of the flow range of a single equipment is limited. In this technical solution, the common flow points of the equipment under test are calibrated by using the first flowmeter and the second flowmeter in the laboratory. Make the indication error of each commonly used flow point ≤0.05%, expanded uncertainty U=0.05%, k=2, and then install the calibrated first flowmeter and second flowmeter on the first pipeline and the second flowmeter On the pipeline, thereby improving the precision and accuracy of the measurement, and a first connecting pipe and a second connecting pipe are arranged between the first pipeline and the second pipeline, so that the first pipeline and the second pipeline are connected in parallel, When collecting data on the equipment under inspection, the first component or the second component can be used according to the common flow point, or the first component and the second component can be used in combination, so that the upper limit of the flow range can be improved, thereby achieving the technology of increasing the upper limit of the flow range Effect.

Description of drawings

Fig. 1 is a structural schematic diagram of a combined standard meter method flow standard device provided by an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a first component provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a second component provided by an embodiment of the present invention;

Fig. 4 is a flowchart of a method for using a combined standard meter method flow standard device provided in an embodiment of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

On the one hand, as shown in Figures 1 to 3, an embodiment of the present invention provides a combined standard meter method flow standard device, which includes:

The measurement assembly includes at least a first assembly and a second assembly, the first assembly includes a first platform 11, a first flow meter 12, a first pipeline 13 and a first valve body 14, and the two ends of the first pipeline 13 Set the first interface 15 and the second interface 16, the first flowmeter 12 is arranged in the middle of the first pipeline 13, the first flowmeter 12 is connected to the first platform 11, and the first valve body 14 is arranged on the first flowmeter 12 Between the second interface 16, the second assembly includes a second platform 21, a second flow meter 22, a second pipeline 23 and a second valve body 24, and the two ends of the second pipeline 23 are provided with a third interface 25 and a second Four ports 26, the second flow meter 22 is arranged in the middle of the second pipeline 23, the second flow meter 22 is connected to the second platform 21, and the second valve body 24 is arranged between the second flow meter 22 and the fourth port 26 ;

A connection assembly, the connection assembly includes a first connecting pipe 31 and a second connecting pipe 32, the two ends of the first connecting pipe 31 are detachably connected to one end side of the first pipeline 13 and the second pipeline 23 respectively, the second connecting pipe The two ends of 32 are respectively detachably connected to the other end sides of the first pipeline 13 and the second pipeline 23 .

In the technical solution provided by the embodiment of the present invention, the function of the measurement component is to measure and calibrate the flow rate of the device under test. The measurement component includes at least a first component and a second component. The first component includes a first platform 11, a first flow meter 12. The first pipeline 13 and the first valve body 14. The two ends of the first pipeline 13 are provided with a first interface 15 and a second interface 16. The first flowmeter 12 is arranged in the middle of the first pipeline 13. The first The flow meter 12 is connected to the first platform 11, the first valve body 14 is arranged between the first flow meter 12 and the second interface 16, and the second assembly includes the second platform 21, the second flow meter 22, and the second pipeline 23 and the second valve body 24, a third port 25 and a fourth port 26 are provided at both ends of the second pipeline 23, the second flowmeter 22 is arranged in the middle of the second pipeline 23, and the second flowmeter 22 is connected to the second The platform 21, the second valve body 24 is arranged between the second flow meter 22 and the fourth interface 26; the function of the connecting assembly is to communicate with the first assembly and the second assembly, and the connecting assembly includes a first connecting pipe 31 and a second connecting pipe 32. The two ends of the first connecting pipe 31 are respectively detachably connected to one end side of the first pipeline 13 and the second pipeline 23, and the two ends of the second connecting pipe 32 are respectively detachably connected to the first pipeline 13 and the second pipeline. On the side of the other end of the second pipeline 23, compared with the prior art, an external clip-on ultrasonic flowmeter is installed on the outside of the pipeline for flow measurement. Affected by many factors such as pipe material, wall thickness, medium, straight pipe length, and installation accuracy, the measurement accuracy of this method is low, generally less than 2%, and can only meet the calibration requirements of process control flow instruments. Calibration requires the preparation of devices with different measurement ranges, and the upper limit of the flow range of a single device is limited. In this technical solution, the first flow meter 12 and the second flow meter 22 are used in the laboratory to test the common flow points of the device under test. Calibrate so that the indication error of each commonly used flow point is ≤0.05%, the expanded uncertainty U=0.05%, k=2, and then install the calibrated first flowmeter 12 and second flowmeter 22 on the first pipe Road 13 and the second pipeline 23, thereby improving the precision and accuracy of measurement, and between the first pipeline 13 and the second pipeline 23, the first connecting pipe 31 and the second connecting pipe 32 are arranged, so that The first pipeline 13 and the second pipeline 23 are connected in parallel. When collecting data on the equipment under inspection, the first component or the second component can be used according to the common flow point, or the first component and the second component can be used in combination, so that the flow The upper limit of the range is improved, so as to achieve the technical effect of increasing the upper limit of the flow range.

The function of the above-mentioned measurement assembly is to measure and calibrate the flow rate of the tested equipment. The measurement assembly includes at least a first assembly and a second assembly. The first assembly includes a first platform 11, a first flow meter 12, a first pipeline 13 and a second assembly. A valve body 14, a first interface 15 and a second interface 16 are provided at both ends of the first pipeline 13, the first flowmeter 12 is arranged in the middle of the first pipeline 13, and the first flowmeter 12 is connected to the first platform 11 , the first valve body 14 is arranged between the first flow meter 12 and the second interface 16, the first pipeline 13 includes a first branch pipe 131 and a second branch pipe 132, and the two ends of the first flow meter 12 are respectively detachable Connected to the first sub-pipe 131 and the second sub-pipe 132, a connecting flange is provided at the end of the first sub-pipe 131 and the second sub-pipe 132 close to the first flowmeter 12 to facilitate the installation and disassembly of the first flowmeter 12, The first valve body 14 adopts a ball valve, and the first flowmeter 12 adopts an existing Coriolis mass flowmeter. The diameter of the first flowmeter 12 is DN50mm, and the first flowmeter 12 can be used alone. A flowmeter 12 is supported, and the first flowmeter 12 is detachably connected to the first pipeline 13, which facilitates the disassembly and installation of the first flowmeter 12. The first valve body 14 is arranged on the first flowmeter 12 and the second interface 16, the first interface 15 and the second interface 16 are used to connect the laboratory standard device or the equipment to be tested. When the first component is used alone, first disassemble the first connecting pipe 31 and the second connecting pipe 32, and then close the The first valve body 14, the two ends of the first pipeline 13 are installed on the standard device in the laboratory, according to the common flow points of the flowmeter to be tested on site, under each common flow point, use the standard device to carry out the first assembly Calibrate so that the indication error of each commonly used flow point is ≤0.05%, the expanded uncertainty U=0.05%, k=2, and then move the first component to the site of the flowmeter to be tested, and pass the first interface 15 and the second interface 16. Connect the first component in series to the pipeline of the tested equipment. The pipeline diameter range of the tested equipment is DN25mm～DN50mm, the flow range is (1～50)m ³ /h, and the pipe diameter of DN25mm～DN40mm can be changed to DN50mm Realize the connection, run the pipeline of the tested equipment, adjust the instantaneous flow rate of the first pipeline 13 by changing the opening degree of the first valve body 14, make the tested equipment run at each common flow point for at least 5 minutes, and simultaneously collect the measured flow rate through the control system The instantaneous flow rate or cumulative flow rate of the first flowmeter 12 on the detection equipment and the first component, at least 30s after collection, stop at the same time, repeat at least 3 times for each common flow point, and calculate the instantaneous flow rate of each common flow point of the tested flowmeter Or the indication error and repeatability of the cumulative flow, stop running the pipeline of the tested flowmeter, make the instantaneous flow become 0, remove the first component from the pipeline of the tested flowmeter, and complete the online calibration of the tested flowmeter, The second assembly includes a second platform 21, a second flowmeter 22, a second pipeline 23 and a second valve body 24, and the two ends of the second pipeline 23 are provided with a third interface 25 and a fourth interface 26. The second flowmeter 22 is set in the middle of the second pipeline 23, the second flowmeter 22 is connected to the second platform 21, and the second valve body 24 is set between the second flowmeter 22 and the fourth interface 26; The role of the assembly is to connect the first assembly and the second assembly. The connection assembly includes a first connecting pipe 31 and a second connecting pipe 32. Both ends of the first connecting pipe 31 are detachably connected to the first pipeline 13 and the second pipe respectively. The side of one end of the road 23, the two ends of the second connecting pipe 32 are respectively detachably connected to the side of the other end of the first pipeline 13 and the second pipeline 23, the structure of the second assembly is the same as that of the first assembly, the difference is that the first The calibers of the pipeline 13 and the second pipeline 23 are different, and the measurement ranges of the first flowmeter 12 and the second flowmeter 22 are different. The second pipeline includes the third branch pipeline 231 and the fourth branch pipeline 232. The second flowmeter The two ends of 22 are respectively detachably connected to the third branch pipe 231 and the fourth branch pipe 232, and a connecting flange is provided at the end of the third branch pipe 231 and the fourth branch pipe 232 close to the second flowmeter 22 to facilitate the second flow rate. The installation and disassembly of meter 22, and the diameter of the first pipeline 13 is smaller than the diameter of the second pipeline 23, when the second assembly is used alone, first disassemble the first connecting pipe 31 and the second connecting pipe 32, and then close the first connecting pipe 31 and the second connecting pipe 32 The second valve body 24, install the two ends of the second pipeline 23 on the standard device in the laboratory, and use the standard device to calibrate the second component at each common flow point according to the common flow points of the flow meter to be tested on site , so that the indication error of each commonly used flow point is ≤0.05%, the expanded uncertainty U=0.05%, k=2, and then the second component is moved to the site of the flow meter to be checked, through the third interface 25 and the fourth interface 26 Connect the second component in series to the pipeline of the tested equipment. The pipeline diameter range of the tested equipment is DN65mm～DN100mm, the flow range is (50～100)m ³ /h, and the pipe diameter of DN65mm and DN80mm can be realized by changing the diameter to DN100mm. Connect and run the pipeline of the tested equipment, adjust the instantaneous flow rate of the second pipeline 23 by changing the opening degree of the second valve body 24, make the tested equipment run at each common flow point for at least 5 minutes, and simultaneously collect the tested flow through the control system The instantaneous flow rate or cumulative flow rate of the second flowmeter 22 on the device and the second component is collected for at least 30 seconds and stopped at the same time, and each common flow point is repeated at least 3 times to calculate the instantaneous flow rate or the flow rate of each common flow point of the tested flowmeter. Indication error and repeatability of cumulative flow, stop running the pipeline of the tested flowmeter, make the instantaneous flow become 0, disassemble the second component from the pipeline of the tested flowmeter, and complete the online calibration of the tested flowmeter. In the technical solution, the first flowmeter 12 and the second flowmeter 22 are used to calibrate the common flow points of the tested equipment in the laboratory, so that the indication error of each common flow point is ≤0.05%, and the expanded uncertainty U=0.05%, k=2, then the first flow meter 12 and the second flow meter 22 after calibration are installed on the first pipeline 13 and the second pipeline 23, thereby improving the measurement The precision and accuracy of the amount, and, between the first pipeline 13 and the second pipeline 23, the first connecting pipe 31 and the second connecting pipe 32 are arranged, so that the first pipeline 13 and the second pipeline 23 are connected in parallel, When collecting data on the equipment under inspection, the first component or the second component can be used according to the common flow point, or the first component and the second component can be used in combination to increase the upper limit of the flow range, thereby achieving the technology of increasing the upper limit of the flow range Effect.

Further, one end of the first connecting pipe 31 is connected to the first pipeline 13, and one end of the first connecting pipe 31 is located between the first interface 15 and the first flow meter 12, and the other end of the first connecting pipe 31 is connected to and the other end of the first connecting pipe 31 is located between the third interface 25 and the second flowmeter 22 . In this embodiment, the connecting assembly is further defined, the first connecting pipe 31 and the second connecting pipe 32 are respectively arranged between the first pipeline 13 and the second pipeline 23, and one end of the first connecting pipe 31 is located at the first interface 15 and the first flowmeter 12, so that the flow can enter the first connecting pipe 31 and the first pipeline 13 from the first interface 15, and the other end of the first connecting pipe 31 is located between the third interface 25 and the second flowmeter 22 Between, so that the flow can enter the first connecting pipe 31 and the first pipeline 13 from the third interface 25, when the first assembly and the second assembly need to be used at the same time, open the first connecting pipe 31 and the second connecting pipe 32, The upper limit of the flow range is improved, thereby achieving the technical effect of increasing the upper limit of the flow range. One end of the second connecting pipe 32 is connected to the first pipeline 13, and one end of the second connecting pipe 32 is located between the second interface 16 and the first valve. Between the body 14, the other end of the second connecting pipe 32 is connected to the second pipeline 23, and the other end of the second connecting pipe 32 is located between the fourth interface 26 and the second valve body 24, the second connecting pipe 32 The role of the first connecting pipe 31 is the same, so that the first connecting pipe 31, the first pipe, the second pipe and the second connecting pipe 32 form a flow channel that communicates with each other, so that the upper limit of the flow range is improved, thereby achieving an increase Technical effect of the upper limit of the flow range.

Further, the connecting assembly further includes a first valve 33 and a second valve 34 , the first valve 33 is set on the first connecting pipe 31 , and the second valve 34 is set on the second connecting pipe 32 . In this embodiment, the connection assembly is further defined, and the first valve 33 is arranged in the middle or both ends of the first connecting pipe 31. When the first valve 33 is arranged in the middle of the first connecting pipe 31, only the first valve 33 needs to be closed. That is, the first pipeline and the second pipeline are not communicated with each other. When the first valve 33 is arranged at both ends of the first connecting pipe 31, the first connecting pipe 31 can be disassembled from the device, so that the first assembly and the second assembly are completely connected. Separate, so as to achieve the effect of separating the first component and the second component conveniently, the second valve 34 is installed in the middle or both ends of the second connecting pipe 32, the function of the second valve 34 is the same as that of the first valve 33, and the structure is also Same, so I won't repeat them.

Further, the plugging head is connected to the first port 15 , the second port 16 , the third port 25 and the fourth port 26 respectively. In this embodiment, a plugging head is added, and the plugging head is made of rubber material, and the plugging head is detachably connected to the first interface 15, the second interface 16, the third interface 25 or the fourth interface 26, so as to achieve The technical effect of blocking the first pipeline 13 or the second pipeline 23.

On the other hand, as shown in Figure 4, the embodiment of the present invention also provides a method for using a combined standard meter method flow standard device, the method includes the following steps:

Step 1: Choose to connect to the first interface or the third interface according to the caliber of the device under inspection;

Step 2: Connect the first interface or the third interface to the standard device in series, and use the standard device to calibrate the device according to the common flow points of the tested equipment, so that the indication error of each common flow point is ≤0.05%, and the expanded uncertainty U=0.05%, k=2;

Step 3: Connect the first interface or the third interface in series to the pipeline of the tested equipment, and run the tested equipment;

Step 4: Change the opening degree of the first valve body or the second valve body to adjust the instantaneous flow rate of the first component or the second component;

Step 5: Simultaneously collect the instantaneous flow or cumulative flow of the device under test, the first flowmeter and the second flowmeter through the control system:

Step 6: Calculate the indication error and repeatability of the instantaneous flow or cumulative flow of each common flow point of the tested equipment.

Further, in the step 5, the collection time of the control system is 30 seconds to 60 seconds, and the collection is repeated at least 3 times for each common flow point.

101. Select to connect to the first interface or the third interface according to the caliber of the device under inspection;

When the first component and the second component are used to measure the flow at the same time, for example, for the tested equipment with a caliber of DN50mm and a flow limit of 80m ³ /h, the tested equipment is connected to the first port and the second port, and the plugging head is used to block the second port. The third interface and the fourth interface, or, the tested equipment with a caliber of DN80mm and a flow limit of 150m ³ /h, the tested equipment is connected to the third and fourth interfaces, and the plugging head seals the first and second interfaces.

102. Connect the first interface or the third interface in series to the standard device, and use the standard device to calibrate the device according to the common flow points of the tested equipment, so that the indication error of each common flow point is ≤0.05%, and the expanded uncertainty U =0.05%, k=2;

Connect the first interface or the third interface to the standard device in series, and use the standard device to calibrate the device according to the common flow points of the tested equipment, so that the indication error of each common flow point is ≤0.05%, and the expanded uncertainty U=0.05 %, k=2.

103. Connect the first interface or the third interface in series to the pipeline of the tested equipment, and run the tested equipment;

The first interface or the third interface is connected in series to the pipeline of the tested equipment, and the second interface or the fourth interface is also connected to the pipeline of the tested equipment, so that the pipeline of the tested equipment is connected with the first component or the second component respectively. The two components form a series connection, and then run the tested equipment.

104. Change the opening degree of the first valve body or the second valve body to adjust the instantaneous flow rate of the first component or the second component;

Change the opening of the first valve body or the second valve body to adjust the instantaneous flow rate of the first component or the second component, so that the tested flowmeter runs for at least 5 minutes at each common flow point, for example, the caliber is DN50mm, and the flow limit is 80m ³ /h of the inspected equipment, the common flow points are 10m ³ /h, 30m ³ /h, 50m ³ /h, 60m ³ /h and 80m ³ /h, and the collection flow points are 10m ³ /h, 30m ³ /h h and 50m ³ /h data, close the second valve body, use the first flow meter for data collection, when collecting data at the flow point of 60m ³ /h and 80m ³ /h, close the first valve body, use The second flowmeter is used for data collection; for the tested equipment with a caliber of DN80mm and a flow limit of 150m ³ /h, the common flow points are 30m ³ /h, 50m ³ /h, 80m ³ /h, 120m ³ /h and 150m ³ /h, when collecting the data at the flow point of 30m ³ /h and 50m ³ /h, close the second valve body, use the first flowmeter for data collection, and when collecting the data at the flow point of 80m ³ /h, close the For the first valve body, use the second flowmeter for data collection. When collecting data at the flow points of 120m ³ /h and 150m ³ /h, open the first valve body and the second valve body at the same time, use the first flowmeter and The second flow meter performs data collection.

105. Simultaneously collect the instantaneous flow or cumulative flow of the device under inspection, the first flowmeter and the second flowmeter through the control system;

Simultaneously collect the instantaneous flow or cumulative flow of the device under inspection, the first flowmeter and the second flowmeter through the control system, and stop at the same time after at least 30 seconds of collection. Each common flow point was repeated at least 3 times.

106. Calculate the indication error and repeatability of the instantaneous flow or cumulative flow of each common flow point of the tested equipment;

Calculate the indication error and repeatability of the instantaneous flow or cumulative flow of each common flow point of the tested equipment.

107. Stop running the pipeline of the tested equipment, make the instantaneous flow rate become 0, disassemble the device from the pipeline of the tested equipment, and complete the online calibration of the tested equipment.

The present invention has the following beneficial effects:

First, the present invention realizes the independent use and combined use of two sets ^of standard meter method flow standard devices, so that the measurement capability of the device is improved. For flowmeters with a lower flow rate lower than 50m ³ /h and a flow upper limit exceeding 100m ³ /h, online calibration can be achieved by combining the first component and the second component; for other flowmeters, the first component or the second component can be used alone Components are calibrated online.

Second, the combined standard meter method flow standard device of the present invention is made up of two sets of standard devices that can be used independently. The first assembly and the second assembly each have an ultra-high-precision master standard, and the two sets of devices They are all in the form of mobile carts with compact structure. They can be moved to the site of the flowmeter to be checked for online calibration of the flowmeter. The caliber of the galvanometric flowmeter is selected to connect the interface, and the instantaneous flow rate is adjusted by changing the opening of the ball valve to realize the optimization of online calibration.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. A combined standard meter flow standard device, characterized in that, comprising: A measuring assembly, the measuring assembly at least includes a first assembly and a second assembly, the first assembly includes a first platform, a first flow meter, a first pipeline and a first valve body, the two of the first pipeline The first port and the second port are set at the end, the first flow meter is set in the middle of the first pipeline, the first flow meter is connected to the first platform, and the first valve body is set in the middle of the first pipeline. Between the first flowmeter and the second interface, the second assembly includes a second platform, a second flowmeter, a second pipeline and a second valve body, and the two ends of the second pipeline are provided with the first Three ports and a fourth port, the second flow meter is set in the middle of the second pipeline, the second flow meter is connected to the second platform, and the second valve body is set on the second Between the flow meter and the fourth interface; A connecting assembly, the connecting assembly includes a first connecting pipe and a second connecting pipe, both ends of the first connecting pipe are respectively detachably connected to one end side of the first pipeline and the second pipeline, and the first connecting pipe Both ends of the two connecting pipes are respectively detachably connected to the side surfaces of the other ends of the first pipeline and the second pipeline. 2. A kind of combined standard meter method flow standard device according to claim 1, characterized in that, One end of the first connecting pipe is connected to the first pipeline, and one end of the first connecting pipe is located between the first interface and the first flowmeter, and the first connecting pipe The other end is connected to the second pipeline, and the other end of the first connecting pipe is located between the third interface and the second flowmeter. 3. a kind of combined standard meter method flow standard device according to claim 1, is characterized in that, One end of the second connecting pipe is connected to the first pipeline, and one end of the second connecting pipe is located between the second interface and the first valve body, and the second connecting pipe The other end is connected to the second pipeline, and the other end of the second connecting pipe is located between the fourth interface and the second valve body. 4. a kind of combined standard meter method flow standard device according to claim 1, is characterized in that, The first pipeline includes a first sub-pipe and a second sub-pipe, and both ends of the first flowmeter are detachably connected to the first sub-pipe and the second sub-pipe respectively. 5. A kind of combined standard meter flow standard device according to claim 1, characterized in that, The second pipeline includes a third sub-pipe and a fourth sub-pipe, both ends of the second flowmeter are detachably connected to the third sub-pipe and the fourth sub-pipe respectively. 6. A combined standard meter method flow standard device according to any one of claims 1 to 5, characterized in that, The diameter of the first conduit is larger than the conduit of the second diameter. 7. A combined standard meter method flow standard device according to any one of claims 1 to 5, characterized in that, The connecting assembly further includes a first valve and a second valve, the first valve is arranged on the first connecting pipe, and the second valve is arranged on the second connecting pipe. 8. A combined standard meter flow standard device according to any one of claims 1 to 5, further comprising: A plugging head, the plugging head is respectively connected to the first port, the second port, the third port and the fourth port. 9. A method for using a combined standard meter method flow standard device, comprising the following steps: Step 1: Choose to connect to the first interface or the third interface according to the caliber of the device under inspection; Step 2: Connect the first interface or the third interface to the standard device in series, and use the standard device to calibrate the device according to the common flow points of the tested equipment, so that the indication error of each common flow point is ≤0.05%, and the expanded uncertainty U=0.05%, k=2; Step 3: Connect the first interface or the third interface in series to the pipeline of the tested equipment, and run the tested equipment; Step 4: Change the opening degree of the first valve body or the second valve body to adjust the instantaneous flow rate of the first component or the second component; Step 5: Simultaneously collect the instantaneous flow or cumulative flow of the device under test, the first flowmeter and the second flowmeter through the control system: Step 6: Calculate the indication error and repeatability of the instantaneous flow or cumulative flow of each common flow point of the tested equipment. 10. The method for using a combined standard meter method flow rate standard device according to claim 9, characterized in that, In the step 5, the collection time of the control system is 30 seconds to 60 seconds, and each common flow point is collected at least three times.

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