CN202092737U - Standard meter type gas flow standard device capable of self-check - Google Patents
Standard meter type gas flow standard device capable of self-check Download PDFInfo
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- CN202092737U CN202092737U CN2011201770087U CN201120177008U CN202092737U CN 202092737 U CN202092737 U CN 202092737U CN 2011201770087 U CN2011201770087 U CN 2011201770087U CN 201120177008 U CN201120177008 U CN 201120177008U CN 202092737 U CN202092737 U CN 202092737U
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Abstract
The utility model discloses a standard meter type gas flow standard device capable of self-check, mainly comprising two sets of standard meter system, a flow meter of detected gas, a measuring system, a pipeline system, a gas source system and a control system. The gas source system is connected to the standard meter system and the flow meter of detected gas through the pipeline system. A negative pressure method is adopted and air exhaust is conducted by an air blower or a pump, and thereby the gas continuously passes through the standard meter and the flow meter of detected gas in the same time interval. The output value of the standard meter and the flow meter of detected gas are detected through the measuring system. Through the control system, on-site device control and data acquisition and processing can be completed. The instrument coefficient, value error, repeatability and uncertainty of the flow meter of detected gas are determined. The standard meter type gas flow standard device is advantageous in that the two sets of standard meter systems can be used independently, achieving the self-check; the two sets of standard meter systems can be used in parallel connection, expanding the measuring range of the integral set; the flow range of the device is 0.1-7500m3/h.
Description
Technical field
The utility model relates to a kind of the realization and belongs to the instrument and meter for automation field from the method for standard table gas flow standard device of verifying function.
Background technology
Method of standard table gas flow standard device development in recent years is rapider, generally adopts velocity flowmeter, volumeter or critical flow venturi nozzle as standard scale.Most devices only adopt one type flowmeter as standard scale, also there is device can adopt the combined type of two types of standard scales, even but combined type, in when operation device also is to select a kind of type standard table system independent operating according to flow, flow range is incompatible, caused device can not carry out to guarantee that from verifying device moves accurately and reliably.
Summary of the invention
The purpose of this utility model is to provide a kind of and can realizes from the method for standard table gas flow standard device of verifying function, using gases turbo flow meter and critical flow venturi nozzle two cover standard scale systems both can independently use, can in parallelly use again, utilizing two cover standard scale systems is the verification function certainly of implement device, guarantees that device moves accurately and reliably; The flow measurement range of expanding unit again.
The technical solution of the utility model is a kind of the realization from the method for standard table gas flow standard device of verifying function,
Be characterized in that this device mainly comprises standard scale system, gas flowmeter body, measuring system, pipe system, air supply system, control system; The standard scale that described standard scale system's employing gas turbine meter and critical flow venturi critical flow nozzle are two types, described measuring system comprises the thermometric pressure instrumentation of measuring critical flow critical flow nozzle assembly, gas-turbine standard scale and tested flowmeter place, and hygrometer, timer; Described pipe system comprises source of the gas pipeline, standard scale pipeline and tested flowmeter pipeline; Described air supply system is source of the gas with the atmosphere, adopts blower fan or vacuum pump apparatus; It is to be basic control system with PC that described control system is put; Described air supply system is connected by pipe system, standard scale system and gas flowmeter body, adopt the negative pressure method, utilize blower fan or pump to bleed, make gas continuously by standard scale and gas flowmeter body in the interval at one time, measure both output valves by measuring system, by being basic control system with PC, finish control of all field apparatus and data acquisition, data processing is determined the instrument coefficient of gas flowmeter body, the error of indication, repeatability or uncertainty of measurement.
The flowmeter that described standard scale system's employing gas turbine meter and critical flow venturi nozzle are two types
As standard scale, two cover standard scale systems respectively separately or in parallelly be connected with air supply system, tested flow, two cover standard scale systems use or in parallel the use from independent respectively, implement device is expanded the measurement range of package unit from verifying function.
In the described critical flow venturi nozzle assembly, the nozzle downstream tandem has double valve, is provided with pressure unit and is used for leak detection between double valve.
The beneficial effects of the utility model: realize adopting gas-turbine and critical flow venturi nozzle two cover standard scale systems in the method for standard table gas flow standard device of verifying function, can independently use, implement device is from verifying function; Can in parallelly use the measurement range of expansion package unit, device flow range: 0.1～7500 m3/h, device uncertainty: U=0.25%(k=2); In the air supply system of critical flow nozzle, used multiple centrifugal fan, both satisfied the requirement of nozzle critical pressure ratio and have that noise is low, vibration is little, efficient is high, operate steadily, advantage is installed, maintaining is convenient etc.; In the critical flow venturi nozzle assembly, designed the nozzle downstream two stop valves have been set, between two stop valves pressure unit is set and carries out pressure monitoring, realized automatic leak detection function.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is the utility model structured flowchart;
Fig. 3 forms synoptic diagram for the utility model structure;
Among the figure: the BW-centrifugal blower, the FC-frequency converter, the PM-vacuum pump, TK-stagnation container, the BV-electric butterfly valve,
The CV-electric control valve, V-butterfly valve, T-temperature transmitter, P-pressure unit, SN-sonic nozzle
Fig. 4 is the magnitude tracing block diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
A kind of method of standard table gas flow standard device of realizing that oneself verifies function by shown in Figure 1, is characterized in,
This device mainly comprises standard scale system, gas flowmeter body, measuring system, pipe system, air supply system, control system; The standard scale that described standard scale system's employing gas turbine meter and critical flow venturi critical flow nozzle are two types, described measuring system comprises the thermometric pressure instrumentation of measuring critical flow critical flow nozzle assembly, gas-turbine standard scale and tested flowmeter place, and hygrometer, timer; Described pipe system comprises source of the gas pipeline, standard scale pipeline and tested flowmeter pipeline; Described air supply system is source of the gas with the atmosphere, adopts blower fan or vacuum pump apparatus; Described control system is to be basic with the PC, comprises flow standard device data collector, the control system of plc data collection and control system; Described air supply system is connected by pipe system, standard scale system and gas flowmeter body, adopt the negative pressure method, utilize blower fan or pump to bleed, make gas continuously by standard scale and gas flowmeter body in the interval at one time, measure both output valves by measuring system, by being basic control system with PC, finish all field apparatus control and data acquisition, data processing, determine the instrument coefficient of gas flowmeter body, the error of indication, repeatability, perhaps uncertainty of measurement.
This gas flow standard device adopts the flowmeter of two types of gas turbine meter with good repeatability and stability and critical flow venturi nozzles as standard scale, with the atmosphere is source of the gas, adopt blower fan or vacuum pump to produce negative pressure, gas is sucked by the test pipeline, in the identical time interval, make gas continuously by gas flowmeter body and standard scale, enter atmosphere, by comparing both output valves, thereby determine the instrument coefficient of gas flowmeter body, the error of indication, repeatability or uncertainty of measurement.Device can be set to test and two kinds of patterns of manual test automatically, generates test result automatically.The structural representation of device is shown in Fig. 2,3:
(1) the standard scale system of this gas flow standard device has adopted the standard scale of two types of gas turbine meter and critical flow venturi critical flow nozzles, and the standard scale configuration sees Table 1.Gas turbine meter with the frequency conversion fan is air supply system, and is easy to operate, the efficient height, and energy consumption low (every typhoon machine peak power 15kW) still owing to the high speed rotating of gas-turbine in the work, needs often verification (or calibration), could keep its pin-point accuracy.Two cover standard scale systems can independently use in the device, critical flow venturi nozzle flow system flow scope covers the flow range of turbine standard scale fully, and because two cover standard scales are diverse types, independently magnitude tracing system is arranged separately: turbo flow meter is traced to the source to the bell jar standard set-up, critical flow venturi nozzle is traced to the source to PVTt method gas standard device, and the magnitude tracing block diagram as shown in Figure 4.Therefore can utilize the verification certainly of two cover standard scale system implement devices, adopt the check standard device, irregularly implement to verify, guarantee that device moves accurately and reliably.Though the critical pressure ratio of critical flow nozzle is low, energy consumption is bigger, but nozzle has accuracy height, stable performance, volume is little, the calibration interval are long characteristics such as (5 years), and two cover systems are in parallel to be used so utilize, the expansion measurement range covers the flow range of package unit: 0.1---7500 m
3/ h.
In the described critical flow venturi nozzle assembly, the nozzle downstream tandem has double valve, is provided with pressure unit between double valve, and monitor pressures changes, and is used for leak detection.When the change flow, the pressure between pent valve group should keep constant, as in setting-up time section internal pressure any variation being arranged, represents that promptly there is leakage in this pipeline section, all hunts leak automatically when installing each startup and switching flow.For example, critical flow venturi nozzle SN1 downstream tandem has double valve BV6, BV12 in Fig. 3, is provided with pressure unit P4 between BV6, the BV12 and is used for leak detection.
Table 1: standard scale configuration
(2) measuring system comprises the thermometric pressure instrumentation of measuring critical flow venturi nozzle assembly, gas-turbine standard scale and tested flowmeter place, and hygrometer, timer etc.Platinum resistance temperature transmitter, absolute pressure transducer have all used the fieldbus instrument of band HART agreement, and tabulation sees Table 2.
Table 2: measurement instrument configuration
(3) pipe system comprises source of the gas pipeline, standard scale pipeline and tested flowmeter pipeline.The source of the gas pipeline adopts flexible joint to be connected with standard scale pipeline joining place, to reduce importing into of source of the gas part mechanical vibration.Critical flow venturi nozzle adopts the mounting means of large space, and 17 critical flow nozzles are designed to three critical flow nozzle assemblies: side-by-side and right cylinder formula, each assembly all are provided with enough big stagnation container.Tested flowmeter pipeline disposes sufficiently long front and back straight length, and in order to adjust gas flowfield, reduce flow resistance and to reduce noise, entrance adopts the bellmouth entrance.
(4) described air supply system is source of the gas with the atmosphere, adopts blower fan or vacuum pump apparatus, and the utility model adopts the negative pressure method, according to the standard scale type, is provided with blower fan and vacuum pump, to satisfy the requirement to source of the gas.Critical flow venturi nozzle assembly (SN1-SN4) has used vacuum pump PM1, critical flow critical flow nozzle assembly (SN5-SN12), used vacuum pump PM2, critical flow critical flow nozzle assembly (SN13-SN17) has used multiple-stage centrifugal fan BW1, three turbine standard scales centrifugal blower BW2 and BW3.The concrete configuration index sees Table 3.With the atmosphere is source of the gas, and the outer circulation mode is adopted in the whole test chamber, and air intake opening is arranged on the interior wall top in rooms 102, and whole Stall corridor becomes a huge buffer zone, reduces the air themperature fluctuation.All blower fans, vacuum pump concentrate between an independent housing, isolate with device.Handle having carried out special sound-deadening and noise-reducing between device exhausr port and pump house.In air supply system, source of the gas at the giant assembly has used multiple centrifugal fan, not only satisfied the requirement of nozzle critical pressure ratio, and have that noise is low, vibration is little, efficient is high, operate steadily, advantages such as installation, maintaining convenience, handle independently having carried out special sound-deadening and noise-reducing between blower fan and pump house simultaneously, obtain good result.
Table 3: air supply system allocation list
(5) the utility model control system is to be basic control system with PC, this control system has been used field bus technique, the programming of employing configuration software is mainly finished all field apparatus control function and data acquisition, data processing and printing test result and form.The flow instrument of paired pulses output, electric current output directly carries out data acquisition, to mechanical count formula flow instrument, by the shooting mode, carries out data acquisition, finishes test.
Realize illustrating from verifying function:
As shown in Figure 2, with a gas meter as the check standard table, be installed on tested flowmeter place, use critical flow venturi nozzle as standard scale earlier, valve-off 4, according to the flow size of tested flowmeter, the critical flow venturi nozzle of selecting the flow size to be fit to is opened respectively or valve-off 1,2,3,5 and two valves of closing obsolete critical flow venturi nozzle rear end, critical flow venturi nozzle has 17, from SN1-SN17, the flow size is as shown in table 1, and according to two valve Push And Releases of critical flow venturi nozzle rear end, can be combined into flow range is 0.1-4100 m
3/ h, with the atmosphere is source of the gas, adopt blower fan or vacuum pump to produce negative pressure, gas is sucked by the test pipeline, makes gas continuously by tested flowmeter and critical flow venturi nozzle in the identical time interval, enters atmosphere, by comparing both output valves, thereby determine the instrument coefficient of tested flowmeter, the error of indication, repeatability or uncertainty of measurement; Use turbo flow meter as standard scale and then, valve-off 1,2,3 is opened valve 4,5, and three turbo flow meters are arranged in pipeline, and flow range all is 160-1200m
3/ h, according to the flow size of tested flowmeter, the valve before opening or closing, as tested flowmeter maximum flow at 160-1200m
3In/the h, then only need open wherein valve that flowmeter is preceding of three turbo flow meters, close the preceding valve of other two flowmeters and get final product; Tested flowmeter maximum flow is at 1200-2400m
3In/the h, then open wherein two valves that flowmeter is preceding of three turbo flow meters, close the preceding valve of other platform flowmeter; Tested flowmeter maximum flow is at 2400-3600m
3In/the h, then the valve of three turbo flow meters is all opened.With the atmosphere is source of the gas, adopt blower fan or vacuum pump to produce negative pressure, gas is sucked by the test pipeline, in the identical time interval, make gas continuously by tested flowmeter and turbo flow meter, enter atmosphere, by both output valves of comparison, thus the instrument coefficient of definite tested flowmeter, the error of indication, repeatability or uncertainty of measurement;
When
The time, judge that from verifying the result the two cover standard scale systems that illustrate can use for qualified, system is in steady state (SS).
Utilize the use in parallel of two cover systems, can expand measurement range, the flow range of package unit is covered: 0.1---7500 m
3/ h.Open or valve-off 1,2,3,4, two valves of 5 and 17 critical flow venturi nozzle rear ends, three preceding valves of turbo flow meter are the scalable flow range.
Two kinds of standard scale gas-turbines and critical flow critical flow nozzle are traceable to bell jar standard set-up and the PVTt method standard set-up of SITIIAS respectively.The magnitude tracing block diagram as shown in Figure 4.
Claims (3)
1. a realization is characterized in that from the method for standard table gas flow standard device of verifying function this device mainly comprises standard scale system, gas flowmeter body, measuring system, pipe system, air supply system, control system; The standard scale that described standard scale system's employing gas turbine meter and critical flow venturi nozzle are two types, described measuring system comprises the thermometric pressure instrumentation of measuring critical flow venturi nozzle assembly, gas-turbine standard scale and tested flowmeter place, and hygrometer, timer; Described pipe system comprises source of the gas pipeline, standard scale pipeline and tested flowmeter pipeline; Described air supply system is source of the gas with the atmosphere, adopts blower fan or vacuum pump apparatus; Described control system is to be basic control system with PC; Described air supply system is connected with standard scale system and gas flowmeter body by pipe system, adopt the negative pressure method, utilize blower fan or pump to bleed, make gas continuously by standard scale and gas flowmeter body in the interval at one time, measure both output valves by measuring system, by being basic control system with PC, finish control of all field apparatus and data acquisition, data processing is determined the instrument coefficient of gas flowmeter body, the error of indication, repeatability or uncertainty of measurement.
2. realization according to claim 1 is from the method for standard table gas flow standard device of verifying function, be characterised in that, the flowmeter that described standard scale system's employing gas turbine meter and critical flow venturi nozzle are two types is as standard scale, two cover standard scale systems respectively separately or in parallelly be connected with air supply system, tested flow, two cover standard scale systems are independent certainly a use or in parallel the use respectively, implement device is from verifying function, the measurement range of expansion package unit.
3. realization according to claim 1 is from the method for standard table gas flow standard device of verifying function, it is characterized in that, in the described critical flow venturi nozzle assembly, the nozzle downstream tandem has double valve, is provided with pressure unit and is used for leak detection between double valve.
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| CN2011201770087U CN202092737U (en) | 2011-05-30 | 2011-05-30 | Standard meter type gas flow standard device capable of self-check |
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| CN2011201770087U CN202092737U (en) | 2011-05-30 | 2011-05-30 | Standard meter type gas flow standard device capable of self-check |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103837215A (en) * | 2014-03-25 | 2014-06-04 | 重庆市计量质量检测研究院 | Reversing valve type pVTt-method gas flow device |
| CN105352568A (en) * | 2015-11-25 | 2016-02-24 | 山东思达特测控设备有限公司 | Method for collecting and calculating low-frequency pulse signals of gas flow meter calibration device |
| CN106338322A (en) * | 2016-08-31 | 2017-01-18 | 金卡高科技股份有限公司 | System and method for detecting active two-way work gas solid flow |
| CN106855990A (en) * | 2015-12-09 | 2017-06-16 | 中核核电运行管理有限公司 | Nuclear power generating sets instrument channel measurement error Demonstration Method |
| CN107131932A (en) * | 2017-06-26 | 2017-09-05 | 深圳市樊溪电子有限公司 | The detection means and detection method of a kind of gas turbine meter |
| CN107238424A (en) * | 2017-06-26 | 2017-10-10 | 深圳市樊溪电子有限公司 | A kind of detection means and detection method of circulating gas turbine meter |
| CN112798084A (en) * | 2021-02-05 | 2021-05-14 | 上海市质量监督检验技术研究院 | Standard meter method gas flow testing device and variable frequency regulation control algorithm thereof |
| CN114923547A (en) * | 2022-06-29 | 2022-08-19 | 成都秦川物联网科技股份有限公司 | Automatic evaluation device and method for uncertainty of gas meter indication value error |
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2011
- 2011-05-30 CN CN2011201770087U patent/CN202092737U/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103837215B (en) * | 2014-03-25 | 2016-08-24 | 重庆市计量质量检测研究院 | Commutation valve type p.V.T.t method gas flow meter |
| CN103837215A (en) * | 2014-03-25 | 2014-06-04 | 重庆市计量质量检测研究院 | Reversing valve type pVTt-method gas flow device |
| CN105352568A (en) * | 2015-11-25 | 2016-02-24 | 山东思达特测控设备有限公司 | Method for collecting and calculating low-frequency pulse signals of gas flow meter calibration device |
| CN105352568B (en) * | 2015-11-25 | 2018-11-09 | 山东思达特测控设备有限公司 | A kind of acquisition computational methods of gas flowmeter caliberating device low frequency pulse signal |
| CN106855990A (en) * | 2015-12-09 | 2017-06-16 | 中核核电运行管理有限公司 | Nuclear power generating sets instrument channel measurement error Demonstration Method |
| CN106855990B (en) * | 2015-12-09 | 2020-09-15 | 中核核电运行管理有限公司 | Nuclear power unit instrument channel measurement error demonstration method |
| CN106338322B (en) * | 2016-08-31 | 2019-05-21 | 金卡智能集团股份有限公司 | A kind of the gas reality stream detection system and method for active two-way operation |
| CN106338322A (en) * | 2016-08-31 | 2017-01-18 | 金卡高科技股份有限公司 | System and method for detecting active two-way work gas solid flow |
| CN107238424A (en) * | 2017-06-26 | 2017-10-10 | 深圳市樊溪电子有限公司 | A kind of detection means and detection method of circulating gas turbine meter |
| WO2019000258A1 (en) * | 2017-06-26 | 2019-01-03 | 深圳市樊溪电子有限公司 | Gas turbine flowmeter detection device and detection method |
| WO2019000259A1 (en) * | 2017-06-26 | 2019-01-03 | 深圳市樊溪电子有限公司 | Detection device and method for circulating type gas turbine flowmeter |
| CN107131932A (en) * | 2017-06-26 | 2017-09-05 | 深圳市樊溪电子有限公司 | The detection means and detection method of a kind of gas turbine meter |
| CN112798084A (en) * | 2021-02-05 | 2021-05-14 | 上海市质量监督检验技术研究院 | Standard meter method gas flow testing device and variable frequency regulation control algorithm thereof |
| CN112798084B (en) * | 2021-02-05 | 2024-06-04 | 上海市质量监督检验技术研究院 | Standard meter method gas flow testing device and variable frequency adjustment control algorithm thereof |
| CN114923547A (en) * | 2022-06-29 | 2022-08-19 | 成都秦川物联网科技股份有限公司 | Automatic evaluation device and method for uncertainty of gas meter indication value error |
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