Measurement system and method for verifying and calibrating flow meter by using small tube volume

Abstract

The invention relates to a measuring system and method for verifying and calibrating a flow meter by using a small tube volume, the system comprises a small working area, a high-precision area, a large working area, a small flow adjusting area, a large flow adjusting area and a secondary standard device, the small working area comprises a verification table group, a verification assembly and a small tube volume calibration assembly; the method comprises the steps of verification of a to-be-verified flowmeter in a small working area and calibration of a standard meter, verification of a to-be-verified flowmeter in a high-precision area and calibration of the to-be-verified flowmeter in a large working area and calibration of the standard meter. According to the invention, the volume of the pipeline between the working-stage standard meter and the secondary standard device is reduced by using the small-volume pipeline, so that the obvious change of the gas component is effectively controlled, and the influence of the change of the gas component on the calibration uncertainty is reduced; besides, in order to ensure that standard meter pipelines with different calibers do not influence each other and the gas flow state is stable, an electric ball valve is used for sealing each pipeline with small volume, and a rectifier is used for integrating the gas flow state.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas metering industry, and in particular to a measuring system and method for verifying and calibrating a flowmeter using a small tube volume. Background Art

[0002] In recent years, natural gas pipelines have gradually developed towards high pressure, large flow, and large diameter, so how to ensure the accuracy and reliability of natural gas measurement has become a key issue. At present, the common 1.0-level gas flow meters are traced through the standard meter method gas flow standard device (working-level standard device), and the working-level standard device can be traced through the critical flow Venturi nozzle method gas flow standard device (secondary standard device). It can be seen from this that improving the accuracy of the secondary standard device to the working-level standard device in transferring the value is of great significance to ensure the accuracy and reliability of natural gas measurement in my country. Summary of the invention

[0003] The invention provides a measuring system and method for verifying and calibrating a flowmeter using a small tube volume, aiming to solve the problems in the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] A measuring system using a small tube volume calibration flowmeter comprises a small working area, a high-precision area, a large working area, a small flow adjustment area, a large flow adjustment area and a secondary standard device. The small working area comprises a calibration station group, a calibration component and a small tube volume calibration component. The calibration component, the calibration station group and the small flow adjustment area are connected in sequence through pipelines. The small tube volume calibration component, the calibration station group and the secondary standard device are connected in sequence through pipelines, and the small tube volume calibration component is connected to the calibration component through pipelines; the high-precision area and the large working area are connected to the secondary standard device through pipelines respectively, and the large working area is also connected to the large flow adjustment area through pipelines.

[0006] The beneficial effects of the present invention are as follows: the measurement process is as follows:

[0007] (1) Low flow area

[0008] During the calibration, the upstream gas passes through the calibration components, calibration station group and small flow regulating area in sequence before reaching the downstream;

[0009] When the small tube volume calibration is not enabled, the upstream gas passes through the calibration component, the calibration station group and the secondary standard device in sequence before reaching the downstream;

[0010] When the small tube volume calibration is enabled, the upstream gas passes through the calibration component, the small tube volume calibration component, the calibration station group and the secondary standard device in sequence before reaching the downstream;

[0011] (2) High-precision area

[0012] During verification / calibration, the upstream gas passes through a high-precision station and reaches the secondary standard device;

[0013] (3) High flow area

[0014] During the calibration, the upstream gas passes through the large working area and the large flow regulating area in turn to reach the downstream;

[0015] During calibration, the upstream gas passes through the large working area and the secondary standard device in sequence to reach the downstream.

[0016] The present invention reduces the volume of the pipeline between the working-level standard meter and the secondary standard device by using a small-capacity pipeline, thereby effectively controlling the significant changes in the gas quality components, thereby reducing the influence of the changes in the gas quality components on the calibration uncertainty; in addition, in order to ensure that the pipelines of standard devices with different calibers do not affect each other and the gas flow pattern is stable, an electric ball valve is used to close each small-capacity pipeline, and a rectifier is used to integrate the gas flow pattern.

[0017] Based on the above technical solution, the present invention can also be improved as follows.

[0018] Furthermore, the calibration station group includes a DN100 calibration station, a DN80 calibration station and a DN50 calibration station, and the DN100 calibration station, the DN80 calibration station and the DN50 calibration station are distributed in parallel; one end of the DN100 calibration station, the DN80 calibration station and the DN50 calibration station are respectively connected to the front pipeline, and the other end thereof are respectively connected to the rear pipeline; a ball valve 1 and a rectifier 1 are respectively fixedly installed on the three front pipelines, and a ball valve 2 is respectively fixedly installed on the three rear pipelines; the calibration assembly and the small tube capacity calibration assembly are respectively connected to the three front pipelines through pipelines, and the three rear pipelines are respectively connected to the small flow regulation area and the secondary standard device through pipelines.

[0019] The beneficial effects of adopting the above further scheme are simple structure, reasonable design, and design of three calibration stations with different calibers to calibrate flow meters of different specifications, which makes calibration convenient.

[0020] Furthermore, one ends of the three front pipelines are respectively connected to the upstream manifold of the small flow calibration area, and the calibration component is connected to the upstream manifold of the small flow calibration area through pipelines; the three rear pipelines are respectively connected to the downstream manifold of the small flow calibration area, and the small flow regulation area and the secondary standard device are respectively connected to the downstream manifold of the small flow calibration area through pipelines.

[0021] The beneficial effects of adopting the above further solution are simple structure, reasonable distribution of various pipelines, saving pipelines, small space occupation and low cost.

[0022] Furthermore, any one of the rear pipelines is connected to the secondary standard device through a downstream small tube container, and the remaining two rear pipelines are connected to the downstream small tube container through pipelines respectively, and ball valves three are fixedly installed on the pipelines connecting the downstream small tube container and the corresponding end of the rear pipeline and the remaining two rear pipelines and the downstream small tube container respectively; the downstream manifold of the small flow calibration area is connected to the downstream small tube container near the end thereof connected to the secondary standard device through a pipeline.

[0023] The beneficial effects of adopting the above further solution are simple structure, reasonable distribution of various pipelines, saving pipelines, small space occupation and low cost.

[0024] Furthermore, the calibration component includes three small flow standard meter pipelines, one ends of the three small flow standard meter pipelines are respectively connected to the upstream manifold of the small flow calibration area; ball valves four are fixedly installed at both ends of the three small flow standard meter pipelines; one end of the small tube capacity calibration component is connected to the parts between two corresponding ball valves four of the three small flow standard meter pipelines through pipelines.

[0025] The beneficial effect of adopting the above further solution is that the pipelines of the three small flow standard meters are reasonably designed to ensure the accuracy of calibration.

[0026] Furthermore, a rectifier 2 and a standard flowmeter 1 are fixed respectively between two of the ball valves 4 on the three small flow standard meter pipelines, and one end of the small tube capacity calibration assembly is connected to the parts between the ball valves 4 and the standard flowmeter 1 on the three small flow standard meter pipelines through pipelines.

[0027] The beneficial effect of adopting the above further solution is that the second rectifier can ensure the stable flow state of the gas in the pipeline.

[0028] Furthermore, one end of the three small flow standard meter pipelines are respectively connected to the upstream manifold of the small flow standard meter area, and the other ends of the three small flow standard meter pipelines are respectively connected to the downstream manifold of the small flow standard meter area; the downstream manifold of the small flow standard meter area is connected to the upstream manifold of the small flow calibration area through a pipeline.

[0029] The beneficial effects of adopting the above further solution are simple structure, reasonable distribution of various pipelines, saving pipelines, small space occupation and low cost.

[0030] Furthermore, the high-precision area includes a high-precision position and a high-precision small tube container, one end of the high-precision position is connected to one end of the high-precision upstream pipeline, and the other end of the high-precision position is connected to the secondary standard device through the high-precision downstream pipeline; ball valves five are fixedly installed on the high-precision upstream pipeline and the high-precision downstream pipeline, respectively, and a rectifier three is fixedly installed on the high-precision upstream pipeline corresponding to the ball valve five and the high-precision position; both ends of the high-precision small tube container are respectively connected to the high-precision downstream pipeline and the secondary standard device, and ball valve eight is fixedly installed on the high-precision small tube container.

[0031] The beneficial effect of adopting the above further scheme is that during verification / calibration, the upstream gas passes through the high-precision station, the high-precision downstream pipeline / high-precision small tube container in sequence to reach the secondary standard device.

[0032] Further, the large working area includes a DN150 standard meter pipeline, a DN200 standard meter pipeline and a large flow small tube container, the DN150 standard meter pipeline and the DN200 standard meter pipeline are distributed in parallel, and the two ends thereof are connected respectively through the upstream manifold of the large flow standard meter area and the downstream manifold of the large flow standard meter area; ball valves six are fixedly installed at both ends of the DN150 standard meter pipeline, and a rectifier four and a standard flow meter two are also fixedly installed at the corresponding position between the two ball valves six on the DN150 standard meter pipeline; one end of the large flow small tube container is connected to the corresponding position between the standard flow meter two and the ball valve six of the DN150 standard meter pipeline, and the other end is connected to the secondary standard device, and a ball valve seven is fixedly installed on the large flow small tube container; the downstream manifold of the large flow standard meter area is connected to the secondary standard device through a pipeline, and the downstream manifold of the large flow standard meter area is also connected in sequence with a large-caliber calibration station and the large flow adjustment area through a pipeline.

[0033] The beneficial effect of adopting the above further scheme is that during the calibration, the upstream gas sequentially passes through the upstream header of the large flow standard meter area, the DN150 standard meter pipeline, the downstream header of the large flow standard meter area and the large flow regulating area to reach the downstream;

[0034] When the small tube volume calibration is not enabled, the upstream gas will reach the downstream through the upstream manifold of the large flow standard meter area, the large flow standard meter pipeline, the downstream manifold of the large flow standard meter area and the secondary standard device in sequence;

[0035] When the small tube capacity calibration is enabled, the upstream gas passes through the upstream manifold of the large flow standard meter area, the large flow standard meter pipeline, the large flow small tube capacity and the secondary standard device to reach the downstream.

[0036] The present invention also relates to a measurement method using a small tube volume verification and calibration flowmeter, which is implemented using the measurement system using a small tube volume verification and calibration flowmeter as described above, and includes the following specific steps:

[0037] (1) Low flow area

[0038] During the calibration, the upstream gas passes through the calibration components, calibration station group and small flow regulating area in sequence before reaching the downstream;

[0039] When the small tube volume calibration is not enabled, the upstream gas passes through the calibration component, the calibration station group and the secondary standard device in sequence before reaching the downstream;

[0040] When the small tube volume calibration is enabled, the upstream gas passes through the calibration component, the small tube volume calibration component, the calibration station group and the secondary standard device in sequence before reaching the downstream;

[0041] (2) High-precision area

[0042] During verification / calibration, the upstream gas passes through the high-precision zone and reaches the secondary standard device;

[0043] (3) High flow area

[0044] During the calibration, the upstream gas passes through the large working area and the large flow regulating area in turn to reach the downstream;

[0045] During calibration, the upstream gas passes through the large working area and the secondary standard device in sequence to reach the downstream.

[0046] The beneficial effect of adopting the above-mentioned further scheme is that the present invention also provides a measurement method for calibrating a flow meter using a small tube volume. This method effectively controls the significant changes in gas composition by reducing the volume of the pipeline between the standard device and the flow meter to be tested, thereby reducing the influence of the change in gas composition on the calibration uncertainty. In addition, in order to ensure that the pipelines of standards of different calibers do not affect each other and the gas flow state is stable, an electric ball valve is used to close each small tube volume pipeline, and a rectifier is used to integrate the gas flow state. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of the present invention.

[0048] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0049] 1. Small flow adjustment area; 2. Secondary standard device; 3. Large flow adjustment area; 4. DN100 calibration station; 5. DN80 calibration station; 6. DN50 calibration station; 7. Ball valve 1; 8. Rectifier 1; 9. Ball valve 2; 10. Upstream manifold of small flow calibration area; 11. Downstream manifold of small flow calibration area; 12. Downstream small pipe capacity; 13. Ball valve 4; 14. Rectifier 2; 15. Standard flow meter 1; 16. Upstream manifold of small flow standard meter area; 17. Downstream manifold of standard meter area; 18. High-precision station; 19. High-precision small tube capacity; 20. High-precision upstream pipeline; 21. High-precision downstream pipeline; 22. Ball valve five; 23. Rectifier three; 24. Ball valve eight; 25. DN200 standard meter pipeline; 26. Large flow small tube capacity; 27. Ball valve six; 28. Rectifier four; 29. ​​Standard flow meter two; 30. Large-caliber calibration station; 31. Ball valve seven; 32. Calibration small tube capacity; 33. Ball valve nine; 34. Ball valve three. DETAILED DESCRIPTION

[0050] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0053] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0054] Example 1

[0055] like Figure 1 As shown, this embodiment provides a measurement system using a small tube volume calibration flowmeter, including a small working area, a high-precision area, a large working area, a small flow regulation area 1 and a secondary standard device 2, the small working area includes a calibration station group, a calibration component and a small tube volume calibration component, the calibration component, the calibration station group and the small flow regulation area 1 are connected in sequence through pipelines, the small tube volume calibration component, the calibration station group and the secondary standard device 2 are connected in sequence through pipelines, and the small tube volume calibration component is connected to the calibration component through a pipeline; the high-precision area and the large working area are connected to the secondary standard device 2 through pipelines respectively, and the large working area is also connected to the large flow regulation area 3 through a pipeline.

[0056] The measurement process is as follows:

[0057] (1) Low flow area

[0058] During the calibration, the upstream gas passes through the calibration component, the calibration station group and the small flow regulating area 1 in sequence before reaching the downstream;

[0059] When the small tube volume calibration is not enabled, the upstream gas passes through the calibration assembly, the calibration station group and the secondary standard device 2 in sequence before reaching the downstream;

[0060] When the small tube volume calibration is enabled, the upstream gas passes through the calibration component, the small tube volume calibration component, the calibration station group and the secondary standard device 2 in sequence and then reaches the downstream;

[0061] (2) High-precision area

[0062] During verification / calibration, the upstream gas passes through the high-precision zone and reaches the secondary standard device 2;

[0063] (3) High flow area

[0064] During the calibration, the upstream gas passes through the large working area and the large flow regulating area 3 in turn to reach the downstream;

[0065] During calibration, the upstream gas passes through the large working area and the secondary standard device 2 in sequence to reach the downstream.

[0066] This embodiment uses a small-capacity pipeline to reduce the pipeline volume between the working-level standard meter and the secondary standard device, effectively controlling the significant changes in the gas composition, thereby reducing the impact of the change in the gas composition on the calibration uncertainty; in addition, in order to ensure that the pipelines of standards of different calibers do not affect each other and the gas flow is stable, an electric ball valve is used to close each small-capacity pipeline, and a rectifier is used to integrate the gas flow.

[0067] Example 2

[0068] On the basis of Example 1, in this embodiment, the calibration station group includes a DN100 calibration station 4, a DN80 calibration station 5 and a DN50 calibration station 6, and the DN100 calibration station 4, the DN80 calibration station 5 and the DN50 calibration station 6 are arranged in parallel; one end of the DN100 calibration station 4, the DN80 calibration station 5 and the DN50 calibration station 6 are respectively connected to the front pipeline, and the other end thereof is respectively connected to the rear pipeline; a ball valve 7 and a rectifier 8 are respectively fixedly installed on the three front pipelines, and a ball valve 2 9 is respectively fixedly installed on the three rear pipelines; the calibration assembly and the small tube capacity calibration assembly are respectively connected to the three front pipelines through pipelines, and the three rear pipelines are respectively connected to the small flow regulation area 1 and the secondary standard device 2 through pipelines.

[0069] The scheme has a simple structure and reasonable design. Three calibration stations with different calibers are designed to calibrate flow meters of different specifications, which is convenient for calibration.

[0070] Based on the above scheme, during calibration, flow meters are installed on DN100 calibration station 4, DN80 calibration station 5 and DN50 calibration station 6 respectively. However, when calibration is performed, the flow meters on the above calibration stations need to be removed and the flow meters to be calibrated need to be installed.

[0071] Example 3

[0072] On the basis of Example 2, in this embodiment, one end of the three front pipes are respectively connected to the upstream manifold 10 of the small flow calibration area, and the calibration component is connected to the upstream manifold 10 of the small flow calibration area through the pipeline; the three rear pipes are respectively connected to the downstream manifold 11 of the small flow calibration area, and the small flow regulation area 1 and the secondary standard device 2 are respectively connected to the downstream manifold 11 of the small flow calibration area through the pipeline.

[0073] The solution has a simple structure, reasonable distribution of pipelines, saves pipelines, occupies little space and has low cost.

[0074] Example 4

[0075] On the basis of Example 3, in this embodiment, any one of the rear pipelines is connected to the secondary standard device 2 through the downstream small tube container 12, and the remaining two rear pipelines are connected to the downstream small tube container 12 through pipelines, and ball valves 34 are fixedly installed on the end of the downstream small tube container 12 connected to the corresponding rear pipeline and the pipelines connecting the remaining two rear pipelines and the downstream small tube container 12; the downstream manifold 11 of the small flow calibration area is connected to the downstream small tube container 12 near the end thereof connected to the secondary standard device 2 through a pipeline.

[0076] The solution has a simple structure, reasonable distribution of pipelines, saves pipelines, occupies little space and has low cost.

[0077] Example 5

[0078] On the basis of any one of Examples 3 to 4, in this embodiment, the calibration component includes three small flow standard meter pipelines, one end of the three small flow standard meter pipelines are respectively connected to the upstream manifold 10 of the small flow calibration area; both ends of the three small flow standard meter pipelines are respectively fixedly installed with ball valves 13; one end of the small tube volume calibration component is respectively connected to the parts between two corresponding ball valves 13 of the three small flow standard meter pipelines through pipelines.

[0079] The pipelines of the three small flow standard meters are reasonably designed to ensure the accuracy of calibration.

[0080] Example 6

[0081] On the basis of Example 5, in this embodiment, a rectifier 2 14 and a standard flow meter 15 are respectively fixed between two of the ball valves 4 13 on the three small flow standard meter pipelines, and one end of the small tube capacity calibration assembly is connected to the parts between the ball valves 4 13 and the standard flow meter 15 on the three small flow standard meter pipelines through pipelines.

[0082] The rectifier 14 can ensure the flow stability of the gas in the pipeline.

[0083] Based on the above scheme, the above-mentioned small tube capacity calibration assembly includes three calibration small tube capacities 32, one end of the three calibration small tube capacities 32 is respectively connected to the parts between the standard flowmeter 15 and the corresponding ball valve of the three small flow standard meter pipelines, and the other end is respectively connected to the parts between the rectifier 8 and the corresponding ball valve of the three front pipelines; the middle part of one of the calibration small tube capacities is connected to the middle parts of the remaining two calibration small tube capacities through a connecting pipeline.

[0084] In addition, ball valves 933 are fixedly installed on both ends of the three calibration small tube containers.

[0085] Example 7

[0086] On the basis of any one of Examples 5 to 6, in this embodiment, one end of the three small flow standard meter pipelines are respectively connected to the upstream manifold 16 of the small flow standard meter area, and the other ends of the three small flow standard meter pipelines are respectively connected to the downstream manifold 17 of the small flow standard meter area; the downstream manifold 17 of the small flow standard meter area is connected to the upstream manifold 10 of the small flow calibration area through a pipeline.

[0087] The solution has a simple structure, reasonable distribution of pipelines, saves pipelines, occupies little space and has low cost.

[0088] Example 8

[0089] On the basis of the above embodiments, in the present embodiment, the high-precision zone includes a high-precision position 18 and a high-precision small tube container 19, one end of the high-precision position 18 is connected to one end of a high-precision upstream pipeline 20, and the other end of the high-precision position 18 is connected to the secondary standard device 2 through a high-precision downstream pipeline 21; ball valve five 22 is fixedly installed on the high-precision upstream pipeline 20 and the high-precision downstream pipeline 21, respectively, and a rectifier three 23 is fixedly installed on the high-precision upstream pipeline 20 corresponding to the ball valve five 22 and the high-precision position 18; the two ends of the high-precision small tube container 19 are respectively connected to the high-precision downstream pipeline 21 and the secondary standard device 2, and a ball valve eight 24 is fixedly installed on the high-precision small tube container 19.

[0090] During verification / calibration, the upstream gas reaches the secondary standard device 2 through the high-precision station 18, the high-precision downstream pipeline 21 / the high-precision small tube container 19 in sequence.

[0091] Example 9

[0092] On the basis of the above embodiments, in this embodiment, the large working area includes a large flow standard meter pipeline, a DN200 standard meter pipeline 25 and a large flow small pipe 26, the DN150 standard meter pipeline and the DN200 standard meter pipeline 25 are arranged in parallel, and the two ends thereof are respectively connected through the upstream manifold of the large flow standard meter area and the downstream manifold of the large flow standard meter area; the two ends of the DN150 standard meter pipeline are respectively fixedly installed with ball valves 6 27, and the portion between the two corresponding ball valves 6 27 on the DN150 standard meter pipeline is also fixedly installed. A rectifier four 28 and a standard flow meter two 29 are installed; one end of the large flow small tube container 26 is connected to the DN150 standard meter pipeline corresponding to the position between the standard flow meter two 29 and the ball valve six 27, and the other end is connected to the secondary standard device 2, and a ball valve seven 31 is fixedly installed on the large flow small tube container 26; the downstream manifold of the large flow standard meter area is connected to the secondary standard device 2 through a pipeline, and the downstream manifold of the large flow standard meter area is also connected to a large-caliber calibration station 30 and the large flow regulating area 3 in sequence through a pipeline.

[0093] During the calibration, the upstream gas passes through the upstream manifold of the large flow standard meter area, the DN150 standard meter pipeline, the downstream manifold of the large flow standard meter area and the large flow regulating area to reach the downstream;

[0094] When the small tube volume calibration is not enabled, the upstream gas will reach the downstream through the upstream manifold of the large flow standard meter area, the large flow standard meter pipeline, the downstream manifold of the large flow standard meter area and the secondary standard device in sequence;

[0095] When the small tube capacity calibration is enabled, the upstream gas passes through the upstream manifold of the large flow standard meter area, the large flow standard meter pipeline, the large flow small tube capacity and the secondary standard device to reach the downstream.

[0096] Example 10

[0097] On the basis of the above embodiments, this embodiment provides a measurement method using a small tube volume calibration flowmeter, which is implemented by using the measurement system using a small tube volume calibration flowmeter as described above, and includes the following specific steps:

[0098] (1) Low flow area

[0099] During the calibration, the upstream gas passes through the calibration component, the calibration station group and the small flow regulating area 1 in sequence before reaching the downstream;

[0100] When the small tube volume calibration is not enabled, the upstream gas passes through the calibration assembly, the calibration station group and the secondary standard device 2 in sequence before reaching the downstream;

[0101] When the small tube volume calibration is enabled, the upstream gas passes through the calibration component, the small tube volume calibration component, the calibration station group and the secondary standard device 2 in sequence and then reaches the downstream;

[0102] (2) High-precision area

[0103] During verification / calibration, the upstream gas passes through the high-precision zone and reaches the secondary standard device 2;

[0104] (3) High flow area

[0105] During the calibration, the upstream gas passes through the large working area and the large flow regulating area 3 in turn to reach the downstream;

[0106] During calibration, the upstream gas passes through the large working area and the secondary standard device 2 in sequence to reach the downstream.

[0107] This embodiment also provides a measurement method for calibrating a flowmeter using a small tube volume. This method effectively controls the significant changes in gas composition by reducing the volume of the pipeline between the standard device and the flowmeter to be tested, thereby reducing the impact of the change in gas composition on the calibration uncertainty. In addition, in order to ensure that the pipelines of standards of different calibers do not affect each other and the gas flow pattern is stable, an electric ball valve is used to close each small tube volume pipeline, and a rectifier is used to integrate the gas flow pattern.

[0108] The measuring method of the measuring system using a small tube volume to calibrate the flowmeter provided by the present invention comprises the following specific steps:

[0109] (1) Low flow area

[0110] During the calibration, the upstream gas passes through the corresponding small flow standard meter pipeline, the corresponding calibration station and the small flow regulating area 1 in sequence before reaching the downstream;

[0111] When the small tube volume calibration is not enabled, the upstream gas passes through the corresponding small flow standard meter pipeline, the corresponding calibration station and the secondary standard device 2 in sequence before reaching the downstream;

[0112] When the small tube volume calibration is enabled, the upstream gas passes through the corresponding small flow standard meter pipeline, the corresponding calibration small tube volume 32, the corresponding calibration station and the secondary standard device 2 in sequence before reaching the downstream;

[0113] (2) High-precision area

[0114] During verification / calibration, the upstream gas passes through the high-precision table, the high-precision downstream pipeline / (here " / " means or) and the high-precision small tube container to reach the secondary standard device.

[0115] (3) High flow area

[0116] During the calibration, the upstream gas passes through the upstream manifold of the large flow standard meter area, the DN150 standard meter pipeline, the downstream manifold of the large flow standard meter area and the large flow regulating area to reach the downstream;

[0117] When the small tube volume calibration is not enabled, the upstream gas will reach the downstream through the upstream manifold of the large flow standard meter area, the large flow standard meter pipeline, the downstream manifold of the large flow standard meter area and the secondary standard device in sequence;

[0118] When the small tube capacity calibration is enabled, the upstream gas passes through the upstream manifold of the large flow standard meter area, the large flow standard meter pipeline, the large flow small tube capacity and the secondary standard device to reach the downstream.

[0119] It should be noted that the arrows in the drawings indicate the direction of gas flow in the pipeline.

[0120] Attached Figure 1The three pipelines in the middle and upper small working areas are DN100, DN80 and DN50 standard meter pipelines and inspected meter pipelines, and both standard meter pipelines and inspected meter pipelines are equipped with small tube capacity pipelines; the middle pipeline (high-precision area) is a DN250 high-precision platform, equipped with small tube capacity pipelines; the lower two pipelines (large working area) are DN150 standard meter pipelines and DN200 standard meter pipelines, of which only the DN150 standard meter pipeline is equipped with a small tube capacity pipeline, and the DN200 standard meter pipeline is not equipped with a small tube capacity pipeline. The small working area, high-precision area, and large working area can be directly connected to the secondary standard device for verification or calibration; the small tube capacity pipelines equipped in the small working area, high-precision area, and large working area can also be connected to the secondary standard device to reduce the impact of the tube volume gas storage and gas quality component changes on the calibration results during calibration. When performing routine calibration, small-capacity pipelines are generally not used; when using secondary standard devices to transfer measurement values ​​between large working standard device standard tables and small working standard device standard tables, or when customers have higher measurement accuracy requirements for high-precision table flow meters, small-capacity pipelines can be used for calibration.

[0121] The present invention provides a measurement system and method for verifying and calibrating a flow meter using a small tube volume, that is, verification and calibration are performed by reducing the tube volume between a secondary standard device standard, a working-level standard device standard and a flow meter used on site to reduce the influence of gas quality components on calibration uncertainty and improve the accuracy of value transfer.

[0122] As natural gas occupies an increasingly important position in my country's economic development, it can be foreseen that how to improve the accuracy and reliability of natural gas measurement will be an issue that needs to be continuously followed up and resolved in the future. The measurement method provided by the present invention has a simple measurement principle and easy-to-obtain component equipment. It is suitable for the pipeline process design of flow laboratories and professional metrology and calibration stations, and can be directly modified on existing pipelines. At the same time, this measurement method can significantly reduce the pipe storage volume between the standard devices of the standard device, effectively control the influence of the gas quality component changes on the calibration results, reduce the uncertainty and improve the accuracy.

[0123] In addition, in order to ensure that the pipelines of different caliber standards do not affect each other and the gas flow is stable, an electric ball valve is used to close each small-capacity pipeline, and a rectifier is used to integrate the gas flow.

[0124] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0125] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0126] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A measurement system for calibrating a flow meter using a small tube volume, characterized in that: The invention comprises a small working area, a high-precision area, a large working area, a small flow regulating area (1), a large flow regulating area (3) and a secondary standard device (2); the small working area comprises a calibration station group, a calibration component and a small tube volume calibration component; the calibration component, the calibration station group and the small flow regulating area (1) are connected in sequence through a pipeline; the small tube volume calibration component, the calibration station group and the secondary standard device (2) are connected in sequence through a pipeline; and the small tube volume calibration component is connected to the calibration component through a pipeline; the high-precision area and the large working area are connected to the secondary standard device (2) through pipelines respectively, and the large working area is also connected to the large flow regulating area (3) through a pipeline.

2. The measuring system for calibrating a flowmeter using a small tube volume according to claim 1, characterized in that: The calibration station group comprises a DN100 calibration station (4), a DN80 calibration station (5) and a DN50 calibration station (6), wherein the DN100 calibration station (4), the DN80 calibration station (5) and the DN50 calibration station (6) are arranged in parallel; one end of the DN100 calibration station (4), the DN80 calibration station (5) and the DN50 calibration station (6) is respectively connected to a front pipeline, and the other end thereof is respectively connected to a rear pipeline; a ball valve 1 (7) and a rectifier 1 (8) are respectively fixedly installed on the three front pipelines, and a ball valve 2 (9) is respectively fixedly installed on the three rear pipelines; the calibration assembly and the small tube volume calibration assembly are respectively connected to the three front pipelines through pipelines, and the three rear pipelines are respectively connected to the small flow regulating area (1) and the secondary standard device (2) through pipelines.

3. The measuring system for calibrating a flowmeter using a small tube volume according to claim 2, characterized in that: One end of the three front pipelines is respectively connected to the upstream manifold (10) of the small flow calibration area, and the calibration component is connected to the upstream manifold (10) of the small flow calibration area through the pipeline; the three rear pipelines are respectively connected to the downstream manifold (11) of the small flow calibration area, and the small flow regulating area (1) and the secondary standard device (2) are respectively connected to the downstream manifold (11) of the small flow calibration area through the pipeline.

4. The measuring system for calibrating a flowmeter using a small tube volume according to claim 3, characterized in that: Any one of the rear pipelines is connected to the secondary standard device (2) through a downstream small tube container (12), and the remaining two rear pipelines are connected to the downstream small tube container (12) through pipelines, and ball valves (34) are fixedly installed on the ends of the downstream small tube container (12) connected to the corresponding rear pipelines and the pipelines connecting the remaining two rear pipelines and the downstream small tube container (12); the downstream manifold (11) of the small flow calibration area is connected to the downstream small tube container (12) near the end thereof connected to the secondary standard device (2) through a pipeline.

5. The measuring system for calibrating a flowmeter using a small tube volume according to claim 3, characterized in that: The calibration component comprises three small flow standard meter pipelines, one end of each of the three small flow standard meter pipelines is connected to the upstream manifold (10) of the small flow calibration area; two ends of each of the three small flow standard meter pipelines are respectively fixedly installed with a ball valve four (13); one end of the small tube volume calibration component is connected to the portion between two corresponding ball valves four (13) of the three small flow standard meter pipelines through pipelines.

6. The measuring system for calibrating a flowmeter using a small tube volume according to claim 5, characterized in that: Rectifier 2 (14) and standard flow meter 1 (15) are fixed respectively between two of the ball valves 4 (13) on the three small flow standard meter pipelines, and one end of the small tube volume calibration assembly is connected to the parts between the ball valves 4 (13) and the standard flow meter 1 (15) on the three small flow standard meter pipelines respectively through pipelines.

7. The measuring system for calibrating a flowmeter using a small tube volume according to claim 5, characterized in that: One end of the three small flow standard meter pipelines is respectively connected to the upstream manifold (16) of the small flow standard meter area, and the other end of the three small flow standard meter pipelines is respectively connected to the downstream manifold (17) of the small flow standard meter area; the downstream manifold (17) of the small flow standard meter area is connected to the upstream manifold (10) of the small flow calibration area through a pipeline.

8. The measuring system for calibrating a flowmeter using a small tube volume according to any one of claims 1 to 7, characterized in that: The high-precision area includes a high-precision position (18) and a high-precision small tube container (19); one end of the high-precision position (18) is connected to one end of a high-precision upstream pipeline (20), and the other end of the high-precision position (18) is connected to the secondary standard device (2) through a high-precision downstream pipeline (21); a ball valve five (22) is fixedly installed on the high-precision upstream pipeline (20) and the high-precision downstream pipeline (21), and a rectifier three (23) is fixedly installed on the high-precision upstream pipeline (20) corresponding to the ball valve five (22) and the high-precision position (18); the two ends of the high-precision small tube container (19) are respectively connected to the high-precision downstream pipeline (21) and the secondary standard device (2), and a ball valve eight (24) is fixedly installed on the high-precision small tube container (19).

9. The measuring system for calibrating a flowmeter using a small tube volume according to any one of claims 1 to 7, characterized in that: The large working area comprises a DN150 standard meter pipeline, a DN200 standard meter pipeline (25) and a large flow small pipe container (26); the DN150 standard meter pipeline and the DN200 standard meter pipeline (25) are arranged in parallel, and the two ends thereof are respectively connected through an upstream manifold of the large flow standard meter area and a downstream manifold of the large flow standard meter area; a ball valve six (27) is fixedly installed at the two ends of the DN150 standard meter pipeline, and a rectifier four (28) and a standard Flow meter two (29); one end of the large flow small tube container (26) is connected to the DN150 standard meter pipeline corresponding to the portion between the standard flow meter two (29) and the ball valve six (27), and the other end is connected to the secondary standard device (2), and a ball valve seven (31) is fixedly installed on the large flow small tube container (26); the downstream manifold of the large flow standard meter area is connected to the secondary standard device (2) through a pipeline, and the downstream manifold of the large flow standard meter area is also connected to a large-caliber calibration station (30) and the large flow regulating area (3) in sequence through a pipeline.

10. A measurement method for calibrating a flow meter using a small tube volume, characterized in that: The method is implemented by using a measurement system for calibrating a flowmeter using a small tube volume as described in any one of claims 1 to 9, comprising the following specific steps: (1) Low flow area During the calibration, the upstream gas passes through the calibration component, the calibration station group and the small flow regulating area (1) in sequence before reaching the downstream; When the small tube volume calibration is not enabled, the upstream gas passes through the calibration component, the calibration station group and the secondary standard device (2) in sequence before reaching the downstream; When the small tube volume calibration is enabled, the upstream gas passes through the calibration component, the small tube volume calibration component, the calibration station group and the secondary standard device (2) in sequence before reaching the downstream; (2) High-precision area During verification / calibration, the upstream gas passes through the high-precision zone and reaches the secondary standard device (2); (3) High flow area During the test, the upstream gas passes through the large working area and the large flow regulating area (3) in sequence to reach the downstream; During calibration, the upstream gas passes through the large working area and the secondary standard device (2) in sequence to reach the downstream.

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