CN213874575U - Differential type standard meter method flow calibrating device - Google Patents
Differential type standard meter method flow calibrating device Download PDFInfo
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- CN213874575U CN213874575U CN202023214008.8U CN202023214008U CN213874575U CN 213874575 U CN213874575 U CN 213874575U CN 202023214008 U CN202023214008 U CN 202023214008U CN 213874575 U CN213874575 U CN 213874575U
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Abstract
The utility model provides a differential standard meter method flow calibrating device, which comprises a main pipeline, a branch pipeline, a to-be-tested flowmeter, a standard flowmeter and a bypass flowmeter, wherein the bypass flowmeter and the to-be-tested flowmeter are installed in the branch pipeline in parallel, and the standard flowmeter and the bypass pipeline of the bypass flowmeter and the to-be-tested flowmeter are installed in the main pipeline in series; obtaining accurate reading of the detected flowmeter by flow offset of the standard flowmeter and the bypass flowmeter under low flow; meanwhile, the flow of the branch pipeline where the bypass flowmeter is located is adjusted to approach the flow of the main pipeline, so that the flow of the branch pipeline where the detected flowmeter is located can approach 0 flow infinitely, and the detected flowmeter can be accurately detected or calibrated in a small flow or micro flow range.
Description
Technical Field
The utility model relates to a fluid measurement examination field especially relates to a differential formula standard meter method flow calibrating installation.
Background
The flow meter is generally defined as: meters that indicate the measured flow rate and/or the total amount of fluid in a selected time interval, simply a meter for measuring the flow rate of fluid in a pipe or open channel, require calibration and calibration during use.
In a conventional flow verification method, a plurality of standard meter flowmeters are generally stacked in parallel to verify the flow of a detected flowmeter with the flow being about the sum of the plurality of standard flowmeters, but in the verification process of the detected flowmeter with a small flow, in order to achieve a small flow or even a micro flow, the flow verification method is generally achieved by continuously reducing the minimum flow measurement capacity of the standard meter, but in the state of the small flow or the micro flow of the standard flowmeter, the measurement accuracy of the standard flowmeter is relatively high, and in this case, the verification result accuracy of the detected flowmeter is poor.
However, if a high-precision standard flowmeter with a small diameter is directly used, high cost is usually required for realizing accurate small flow, and the cost of the high-precision flowmeter with a small diameter is far higher than that of a large-diameter flowmeter, but the stability and the reliability still have problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing a differential standard meter method flow calibrating device.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a differential standard meter method flow calibrating device comprises a main pipeline, a branch pipeline, a to-be-detected flowmeter, a standard flowmeter and a bypass flowmeter, wherein the bypass flowmeter and the to-be-detected flowmeter are installed in the branch pipeline in parallel, the standard flowmeter and the branch pipeline of the bypass flowmeter and the to-be-detected flowmeter are installed in the main pipeline in series, the standard flowmeter and the bypass flowmeter are high-precision flowmeters, and accurate reading of the to-be-detected flowmeter is obtained through flow offset under low flow of the standard flowmeter and the bypass flowmeter; meanwhile, the flow of the branch pipeline where the bypass flowmeter is located is adjusted to approach the flow of the main pipeline, so that the flow of the branch pipeline where the detected flowmeter is located can approach 0 flow infinitely, and the detected flowmeter can be accurately detected or calibrated in a small flow or micro flow range.
Preferably, the bypass flowmeter and the flowmeter to be detected are respectively connected with a regulating valve in series to regulate the flow in the branch flowmeter.
Preferably, the driving fan is arranged at the left air inlet of the main pipeline or the right air outlet of the main pipeline, or the left air inlet of the main pipeline or the right air outlet of the main pipeline is connected with a pipeline which has a pressure difference with the interior of the main pipeline and has flowing media.
A fan is arranged at an air inlet on the left side of the main pipeline, a frequency converter is arranged on the fan, and the flow of the fluid in the main pipeline is adjusted, so that an ideal value can be obtained by the standard flowmeter in the verification process; the pipeline with the flow medium and the pressure difference in the main pipeline is connected with the pipeline with the flow pressure difference, and the detected flow can be directly detected by using the device.
Preferably, the main pipeline is provided with a switch valve for controlling the main flow switch of the pipeline.
Compared with the prior art, the beneficial effects of the utility model are that: the method of adding the flow measured by the detected meter under the same temperature, pressure and component and subtracting the flow measured by the standard meter from the flow measured by the differential standard meter obtains the accurate reading of the detected meter by offsetting the flow under the low flow of the standard meter and the bypass meter; meanwhile, the flow of the branch pipeline where the bypass flowmeter is located is adjusted to approach the flow of the main pipeline, so that the flow of the branch pipeline where the detected flowmeter is located can approach 0 flow infinitely, and the detected flowmeter can be accurately detected or calibrated in a small flow or micro flow range.
Drawings
Fig. 1 is a schematic view of embodiment 1 of the present invention;
fig. 2 is a flowchart of embodiment 2 of the present invention;
description of reference numerals: 11. a main pipeline, 12 branch pipelines, 21 standard flowmeters, 22 bypass flowmeters, 23 detected flowmeters, 3 regulating valves, 4 fans, 41 frequency converters and 5 switch valves.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Embodiment 1, as shown in fig. 1, a differential standard meter method flow calibrating apparatus includes a main pipe 11, a branch pipe 12, a to-be-tested flow meter 23, a standard flow meter 21, and a bypass flow meter 22, where the bypass flow meter 22 and the to-be-tested flow meter 23 are installed in parallel on the branch pipe 12, and the standard flow meter 21 and the branch pipe 12 where the bypass flow meter 22 and the to-be-tested flow meter 23 are installed in series on the main pipe 11.
The standard flow meter 21 and the bypass flow meter 22 are accurate high-precision flow meters, and the measured flow rates are also accurate values.
The bypass flowmeter 22 and the detected flowmeter 23 are respectively connected in series with a regulating valve 3, and the regulating valve 3 regulates the flow of the branch pipeline 12 at different ideal values to obtain the accurate values of the detected flowmeter 23 under different flow states.
The air inlet on the left side of the main pipeline 11 or the air outlet on the right side of the main pipeline 11 is provided with the fan 4, the fan 4 is provided with the frequency converter 41, the frequency converter 41 acts on the fan 4, the air inflow of the fan 4 is adjusted, and the flow in the main pipeline 11 is enabled to be in an ideal value.
Or the left air inlet of the main pipeline 11 or the right air outlet of the main pipeline 11 is connected with a pipeline which has a pressure difference and has a flowing medium in the main pipeline 11, and when natural gas or other medium flow exists in the pipeline connected in the natural environment, the fan 4 is not required to drive, and the detected flow meter 23 can be detected by the aid of the existing pressure difference or flowing flow in the pipeline.
The main pipeline 11 is provided with a switch valve 5 for controlling the flow switch of the whole device.
Example 2, as shown in fig. 2, the specific implementation steps are as follows:
step 1, controlling a switch valve 5 to intake air, adjusting a frequency converter 41, setting a fixed numerical value of a main pipe fluid volume, and reading a reading q1 of a standard flowmeter 21;
step 2, controlling a regulating valve 3 connected with the bypass flowmeter 22 in series, setting the fluid volume of a branch pipeline 12 where the bypass flowmeter 22 is located at a fixed value, and reading a reading q2 of the bypass flowmeter 22;
and step 3, reading the numerical value of the detected flowmeter 23, obtaining the reading q3 of the detected flowmeter 23, and calculating the relative error numerical value E of the detected flowmeter to be (q2+ q3-q1)/q1 multiplied by 100%.
Only the standard flow meter 21 and the bypass flow meter 22 acquire meters need to be corrected, which is the prior art and will not be described herein in detail, by correcting the measured values to true values with known errors.
And adjusting the fluid volume of the branch pipeline 12 in which the bypass flowmeter 22 is positioned, so that the value q2 of the bypass flowmeter 22 approaches the value q1 of the standard flowmeter 21 from the value larger than 0, and the value q3 of the detected flowmeter 23 is obtained from the value approaching the value q1 of the standard flowmeter 21 to the value approaching 0, and the change curve of E is obtained.
And calculating a variation curve of the E, calculating a variation curve of the relative error E of the detected flowmeter, removing a flow range part below the boundary flow of the standard flowmeter 21 and the bypass flowmeter 22, and correcting the values q1 and q2 by using the values obtained in the flow range part above the boundary flow, wherein the flow below the boundary flow is a low-measurement-precision range part, and the flow above the boundary flow is a high-measurement-precision range part.
In actual operation, the accuracy of the flowmeter is poor at a small range of values, so the initial flow value of the bypass flowmeter 22 is as high as possible above the error range value of the standard flowmeter 21.
Assume that the measurement range of the standard flowmeter 21 is 0-2000m3The measurement range of the bypass flowmeter 22 is 0-2000m3The small flow range with large error of the standard flowmeter 21 is 0-200m3H, then the initial flow setting of the bypass conduit 12 in which the bypass flow meter 22 is located is greater than 200m3The rest discrete points can be selected from 200-3And obtaining the q3 value of the detected flowmeter 23 in the process of passing the fluid flow by integer values in the range of/h, and obtaining the change curve of E in different flow states through calculation.
The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.
Claims (6)
1. The utility model provides a differential formula standard meter method flow calibrating installation which characterized in that: the system comprises a main pipeline, a branch pipeline, a detected flowmeter, a standard flowmeter and a bypass flowmeter, wherein the bypass flowmeter and the detected flowmeter are installed in the branch pipeline in parallel, and the standard flowmeter and the bypass flowmeter and the branch pipeline connected with the detected flowmeter in parallel are installed in the main pipeline in series.
2. The differential standard meter method flow calibrating apparatus according to claim 1, wherein: the bypass flowmeter and the flowmeter to be detected are respectively connected with a regulating valve in series.
3. The differential standard meter method flow calibrating apparatus according to claim 1, wherein: and a driving fan is arranged at the air inlet on the left side of the main pipeline or the air outlet on the right side of the main pipeline.
4. The differential standard meter method flow calibrating apparatus according to claim 1, wherein: and the left air inlet of the main pipeline or the right air outlet of the main pipeline is connected with a pipeline which has pressure difference with the interior of the main pipeline and has a flowing medium.
5. The differential standard meter method flow verification device of claim 3, wherein: and the fan is provided with a frequency converter.
6. The differential standard meter method flow calibrating apparatus according to claim 1, wherein: the main pipeline is provided with a switch valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023214008.8U CN213874575U (en) | 2020-12-28 | 2020-12-28 | Differential type standard meter method flow calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023214008.8U CN213874575U (en) | 2020-12-28 | 2020-12-28 | Differential type standard meter method flow calibrating device |
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| Publication Number | Publication Date |
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| CN213874575U true CN213874575U (en) | 2021-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023214008.8U Active CN213874575U (en) | 2020-12-28 | 2020-12-28 | Differential type standard meter method flow calibrating device |
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| CN (1) | CN213874575U (en) |
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