CN201225920Y - Gas flow standard device combining acoustic speed nozzle method and standard table method - Google Patents
Gas flow standard device combining acoustic speed nozzle method and standard table method Download PDFInfo
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- CN201225920Y CN201225920Y CNU2008200778554U CN200820077855U CN201225920Y CN 201225920 Y CN201225920 Y CN 201225920Y CN U2008200778554 U CNU2008200778554 U CN U2008200778554U CN 200820077855 U CN200820077855 U CN 200820077855U CN 201225920 Y CN201225920 Y CN 201225920Y
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Abstract
The utility model relates to a gas flow-rate standard device integrating the sonic nozzle method and the standard scale method, which is provided with a measure gauge pipeline set, an industrial control computer, a measure gauge pressure transducer, a measure gauge temperature transducer set, a measure gauge valve set, a first manifold trunk, a bypass pipe, a first pressure transducer set, a standard turbine flow-meter set, a first temperature transducer set, a bypass valve, a second manifold trunk, a standard turbine flow-meter valve set, a switching valve, a stagnation vessel, a second temperature transducer, a second pressure transducer, a sonic nozzle set, a third pressure transducer set, a sonic nozzle valve set, a third manifold trunk, a transducer, a blower set, a blower valve set, a vacuum pump set, a vacuum pump valve set and a gas discharging pipeline. The device not only can adopt the sonic nozzle method but also can adopt the standard scale method to detect the measure flow-meter, so as to display the advantages of both the sonic nozzle method and the standard scale method, thereby not only can work independently, but also can be cooperated with each other to work, and realizing the mutual check, and improving the reliability of the detection, and being convenient for the detection work.
Description
Technical field
The utility model relates to a kind of gas flow standard device that gas meter detects and calibrates, gas flow standard device that particularly a kind of sonic nozzle method and method of standard table combine of being used for.
Background technology
Existing gas flow standard device is generally single sonic nozzle method gas flow standard device, method of standard table gas flow standard device and bell-jar gas flow standard equipment or the like.In daily gas meter detection and calibration operation process, accuracy, reliability requirement to transmission of quantity value are very high, all gases flow standard device is because the difference of its principle of work, its characteristics and scope of application is separately all arranged, and the flow standard device that single method is realized is difficult at many-side meet the demands better very high detection and calibration operation.For example, sonic nozzle method gas flow standard device uses the sonic nozzle group, makes up by certain mode and realizes different flows, has that stability is high, repdocutbility is good, the advantage of no movable part, but the expansion of its range ability has certain limitation.Because discharge characteristic the unknown to each sonic nozzle, gaseous fluid will reach velocity of sound in employed each sonic nozzle throat in the time of will guaranteeing work fully, need to consume very a large amount of energy, its energy consumption range is higher, and auxiliary device occupied grounds such as institute's use vacuum pump or air compressor machine are big, the maintenance cost height.The employed turbo flow meter of method of standard table gas flow standard device has stability height, good reproducibility, precision advantage of higher, be used in combination range extension scope greatly, and measuring accuracy can not reduce, the energy consumption range is lower, but its deficiency is a turbo flow meter exists movable part, and long-term use wearing and tearing, contaminated easily cause rotational resistance to increase, measuring accuracy reduces, and its low discharge measurement capability deficiency.CN2814357Y discloses a kind of sonic nozzle gas meter calibrating installation that adopts positive platen press that all types of industries is tested, demarcated with gas meter, comprises source of the gas, sonic nozzle standard scale, calibration operation platform, and each several part connects by pipeline.As the calibrating medium, contact successively by pipeline and connect high pressure positive blower, ratio adjusting valve and buffering container by air intake opening with atmosphere for its source of the gas part.CN2490553Y discloses a kind of bell-jar gas flow standard equipment, is made up of base, liquid bath, bell jar, column, guide wheel post, guide wheel, crossbeam, pressure compensation mechanism and pipeline, valve.Compensation mechanism is made up of pulley, pressure compensation dish, traction rope and large and small balance bob.For how to bring into play simultaneously the sonic nozzle method detects above-mentioned technology and method of standard table detection advantage separately, does not provide the technical scheme of directiveness.
Summary of the invention
The purpose of this utility model is to overcome the deficiency of prior art, the gas flow standard device that provides a kind of sonic nozzle method and method of standard table to combine, it can adopt the sonic nozzle method to detect tested flowmeter, can adopt method of standard table to detect tested flowmeter again, thereby brings into play its advantage separately, accomplish both can work alone, again can cooperating, realize verifying mutually comparison, thereby improve the reliability of testing greatly, make things convenient for testing, satisfy the various needs of testing.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is as follows:
The gas flow standard device that a kind of sonic nozzle method and method of standard table combine, has tested table pipeline group, industrial control computer, its technical scheme are that described gas flow standard device also has tested gauge pressure transmitter, tested table temperature transmitter group, tested meter valve group, first manifold trunk, bypass conduit, the first pressure unit group, standard turbo flowmeter group, the first temperature transmitter group, bypass valve, second manifold trunk, standard turbo flowmeter valve sets, switch valve, the stagnation container, second temperature transmitter, second pressure unit, the sonic nozzle group, the 3rd pressure unit group, the sonic nozzle valve sets, the 3rd manifold trunk, frequency converter, the blower fan group, the blower fan valve sets, the vacuum pump group, the vacuum pump valve sets, gas exhaust duct; Be separately installed with tested gauge pressure transmitter on the above-mentioned tested table pipeline group, tested table temperature transmitter group, its downstream is connected with tested meter valve group respectively, be pooled to jointly on first manifold trunk, the first manifold trunk downstream connects a bypass conduit and standard turbo flowmeter group, bypass conduit is provided with bypass valve, be separately installed with the first pressure unit group on the standard turbo flowmeter group, the first temperature transmitter group, each line downstream of standard turbo flowmeter group is connected with standard turbo flowmeter valve sets respectively, bypass conduit is passed through bypass valve, each line downstream of standard turbo flowmeter group is connected on second manifold trunk jointly by standard turbo flowmeter valve sets respectively, the second manifold trunk downstream connects switch valve, the switch valve downstream connects the stagnation container, second temperature transmitter is installed on the stagnation container, second pressure unit, stagnation container downstream connects the sonic nozzle group, each line downstream of sonic nozzle group is installed respectively and is connected with the 3rd pressure unit group, the sonic nozzle valve sets, each line downstream of sonic nozzle group is connected on the 3rd manifold trunk jointly by the sonic nozzle valve sets respectively, the 3rd manifold trunk downstream is connected with the vacuum pump valve sets, the vacuum pump valve sets is connected respectively on the vacuum pump group, second manifold trunk is connected with the blower fan valve sets, blower fan valve sets downstream is connected respectively on the blower fan group, the air outlet of blower fan group and vacuum pump group is connected respectively on the gas exhaust duct, and last gas is discharged jointly by gas exhaust duct; Tested gauge pressure transmitter, tested table temperature transmitter group, the first pressure unit group, standard turbo flowmeter group, the first temperature transmitter group, second temperature transmitter, second pressure unit, the 3rd pressure unit group, signal output part respectively (passing through signal wire) be connected on the data acquisition end of industrial control computer, the control output end of industrial control computer respectively with the electrical input terminal of blower fan valve sets, the electrical input terminal of vacuum pump valve sets, the electrical input terminal of switch valve 13, the control input end of frequency converter is connected, the signal output part of frequency converter respectively with the blower fan group in each blower fan and each vacuum pump in the vacuum pump group be connected.
The utlity model has tested table pipeline group, industrial control computer, its technical scheme are that described gas flow standard device also has tested gauge pressure transmitter, tested table temperature transmitter group, tested meter valve group, first manifold trunk, bypass conduit, the first pressure unit group, standard turbo flowmeter group, the first temperature transmitter group, bypass valve, second manifold trunk, standard turbo flowmeter valve sets, switch valve, the stagnation container, second temperature transmitter, second pressure unit, the sonic nozzle group, the 3rd pressure unit group, the sonic nozzle valve sets, the 3rd manifold trunk, frequency converter, the blower fan group, the blower fan valve sets, the vacuum pump group, the vacuum pump valve sets, gas exhaust duct.
The valve that the utility model package unit is adopted can be pneumatic ordinary ball valve and butterfly valve, the control of flow and back pressure ratio is by an industrial control computer collecting temperature, pressure, coherent signals such as flow, pass through digital filtering, the various control signals of the final output of flow rate calculation and various control algolithm, by control blower fan valve sets, the opening and closing of vacuum pump valve sets, and realize the normal flows of different sizes by the rotating speed that frequency converter is controlled blower fan or vacuum pump respectively, in order to detect, demarcate various dissimilar gas flow instrument, and show the final data result and realize various report output by computing machine, print.This covering device has been abandoned the high energy consumption working method that the common blower fan of operating at full capacity that adopts or vacuum pump add ratio adjusting valve or proportional dump valve, greatly reduces the consumption of electric energy, and the Energy Efficiency Ratio advantage is remarkable, very energy savings.
The utility model can be divided into two kinds of work systems according to its principle of work:
(1), sonic nozzle method system, rely on industrial control computer control vacuum pump extracting air to produce gas flow, air-flow is at first flowed into by tested table pipeline, by tested table, produce the needed calibrating gas flow of testing process by the sonic nozzle group with array mode again, be used for detecting tested flow instrument by the fluid principle of continuity.This detection method is originally as prior art.
(2), method of standard table system, also rely on industrial control computer control blower fan extracting air to produce gas flow, air-flow is at first flowed into by tested table pipeline, and by tested table, the rotating speed that the flow that relies on industrial control computer to gather standard turbo flowmeter group is controlled blower fan produces normal flow.The normal flow that standard turbo flowmeter group produces is pressed the fluid principle of continuity by tested table, thereby detects tested flow instrument.This detection method is originally as prior art.
Can mainly take three kinds of detecting patterns to detect again according to daily need, be respectively:
One, sonic nozzle method examination criteria turbine flow meter systems, combination by different pipeline and valve, realization is carried out " on-line proving " with sonic nozzle to the standard turbo flowmeter, realize the one-level transmission of quantity value, simultaneously " on-line proving " can also realize online examination to the sonic nozzle operating characteristic, the actual measurement sonic nozzle by pressure ratio, run on optimum Working all the time in order to guarantee sonic nozzle in the future, guarantee the accuracy of Measuring and testing.
Two, the sonic nozzle method detects tested flow instrument system, by the combination of different pipeline and valve, realizes with the sonic nozzle being standard, all kinds of gas flow instrument of independent detection, and its flow range is 1～1723m
3/ h.
Three, method of standard table detects tested flowmeter system, by the combination of different pipeline and valve, for example can be by the accurate turbo flow meter of 5 station symbols as standard meter, and wherein the measurement range of a DN80 standard turbo flowmeter is 13～250m
3/ h, four remaining DN150 standard turbo flow measurement weight ranges are 80～1600m
3/ h, 5 are used in combination, and have not only realized the expansion of range, and according to the flow range of tested table, select the number of parallel running standard turbo flowmeter, and flow measurement range can reach 25～6400m
3/ h.
In sum, the utility model can adopt the sonic nozzle method to detect tested flowmeter, can adopt method of standard table to detect tested flowmeter again, this combination has overcome its shortcoming separately, brought into play advantage separately, had complementary advantages, both can work alone, again can cooperating, realized mutual verification comparison, the calibrating accuracy height of device, thus improved the reliability of testing greatly, make things convenient for testing, satisfied the various needs of testing.Simultaneously, the utility model input cost is lower, and is simple in structure, easy to operate.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
As Fig. 1, the utlity model has tested table pipeline group (containing the meter-clamping apparatus group) 1, industrial control computer 21, tested gauge pressure transmitter 2, tested table temperature transmitter group 3, tested meter valve group 4, first manifold trunk 5, bypass conduit 6, the first pressure unit group 7, standard turbo flowmeter group 8, the first temperature transmitter group 9, bypass valve 10, second manifold trunk 11, standard turbo flowmeter valve sets 12, switch valve 13, stagnation container 14, second temperature transmitter 15, second pressure unit 16, sonic nozzle group 17, the 3rd pressure unit group 18, sonic nozzle valve sets 19, the 3rd manifold trunk 20, frequency converter 24 (containing the variable frequency control regulator cubicle), blower fan group 26, blower fan valve sets 25, vacuum pump group 27, vacuum pump valve sets 28, gas exhaust duct 29.The above-mentioned tested table pipeline group 1 that is in parallel (can be eight tested table pipelines) is arranged in order according to the caliber size, be separately installed with tested gauge pressure transmitter group 2, tested table temperature transmitter group 3 on it, tested table pipeline group 1 downstream straight length connects the tested meter valve group 4 of identical bore respectively, is pooled to jointly then on first manifold trunk 5.The quantity of tested gauge pressure transmitter 2 is one, uses the tested table pipeline of which bar just the measuring junction of pressure unit 2 to be mounted on this tested table pipeline by Quick Connect Kit.First manifold trunk, 5 downstreams connect a bypass conduit 6 and standard turbo flowmeter group 8, bypass conduit 6 is provided with bypass valve 10, standard turbo flowmeter group 8 can have the standard turbo flowmeter that five (individual) are in parallel, wherein one is the DN80 standard turbo flowmeter of selling on the market, four remaining DN150 standard turbo flowmeters for selling on the market.Be separately installed with the first pressure unit group 7, the first temperature transmitter group 9 on the standard turbo flowmeter group 8, each pipeline of standard turbo flowmeter group 8 (five pipeline) downstream is connected with standard turbo flowmeter valve sets 12 respectively, and bypass conduit 6 is connected on second manifold trunk 11 by standard turbo flowmeter valve sets 12 respectively jointly by each line downstream of bypass valve 10, standard turbo flowmeter group 8.Second manifold trunk, 11 downstreams connect switch valve 13, switch valve 13 downstreams connect stagnation container 14, second temperature transmitter 15 is installed on the stagnation container 14, second pressure unit 16, the quantity of second temperature transmitter 15 can be one or two, the quantity of second pressure unit 16 can be one, stagnation container 14 downstreams connect sonic nozzle group 17, sonic nozzle group 17 can have 11 sonic nozzles, each line downstream of sonic nozzle group 17 is installed respectively and is connected with the 3rd pressure unit group 18, sonic nozzle valve sets 19, each line downstream of sonic nozzle group 17 is connected on the 3rd manifold trunk 20 jointly by sonic nozzle valve sets 19 respectively.The 3rd manifold trunk 20 downstreams are connected with vacuum pump valve sets 28, vacuum pump valve sets 28 is connected respectively on the vacuum pump group 27, second manifold trunk 11 is connected with blower fan valve sets 25, blower fan valve sets 25 downstreams are connected respectively on the blower fan group 26, the air outlet of blower fan group 26 and vacuum pump group 27 is connected respectively on the gas exhaust duct 29, and last gas is discharged jointly by gas exhaust duct 29.Above-mentioned blower fan group 26 can have two blower fans that are in parallel, and correspondingly, blower fan valve sets 25 has two blower fan valves that are in parallel.Vacuum pump group 27 can have 3 vacuum pumps that are in parallel, and correspondingly, vacuum pump valve sets 28 has 3 vacuum pump valves that are in parallel.Valve in tested meter valve group 4, bypass valve 10, standard turbo flowmeter valve sets 12, switch valve 13, sonic nozzle valve sets 19, blower fan valve sets 25, the vacuum pump valve sets 28 can be pneumatic ordinary ball valve or butterfly valve.
As Fig. 1, tested gauge pressure transmitter 2, tested table temperature transmitter group 3, the first pressure unit group 7, standard turbo flowmeter group 8, the first temperature transmitter group 9, second temperature transmitter 15, second pressure unit 16, the 3rd pressure unit group 18, signal output part respectively (passing through signal wire) be connected on the data acquisition end 22 of industrial control computer 21, the control output end 23 of industrial control computer 21 respectively with the electrical input terminal of blower fan valve sets 25, the electrical input terminal of vacuum pump valve sets 28, the electrical input terminal of switch valve 13, the control input end of frequency converter 24 is connected, the signal output part of frequency converter 24 respectively with blower fan group 26 in each blower fan and each vacuum pump in the vacuum pump group 27 be connected.Industrial control computer 21 is gathered various process signals like this, digital filtering by industrial control computer internal hardware and software realization, various control algolithms such as flow rate calculation and digital PID, finally export various control signals by the control output end 23 of industrial control computer, by control blower fan valve sets 25, the opening and closing of vacuum pump valve sets 28, and realize the normal flows of different sizes by the rotating speed that frequency converter is controlled blower fan or vacuum pump respectively, in order to detect, demarcate various dissimilar gas flow instrument, and show the final data result and realize various report output by computing machine, print.
Claims (1)
1, the gas flow standard device that a kind of sonic nozzle method and method of standard table combine, has tested table pipeline group, industrial control computer is characterized in that described gas flow standard device also has tested gauge pressure transmitter (2), tested table temperature transmitter group (3), tested meter valve group (4), first manifold trunk (5), bypass conduit (6), the first pressure unit group (7), standard turbo flowmeter group (8), the first temperature transmitter group (9), bypass valve (10), second manifold trunk (11), standard turbo flowmeter valve sets (12), switch valve (13), stagnation container (14), second temperature transmitter (15), second pressure unit (16), sonic nozzle group (17), the 3rd pressure unit group (18), sonic nozzle valve sets (19), the 3rd manifold trunk (20), frequency converter (24), blower fan group (26), blower fan valve sets (25), vacuum pump group (27), vacuum pump valve sets (28), gas exhaust duct (29);
Be separately installed with tested gauge pressure transmitter group (2) on the above-mentioned tested table pipeline group (1), tested table temperature transmitter group (3), its downstream is connected with tested meter valve group (4) respectively, be pooled to jointly on first manifold trunk (5), first manifold trunk (5) downstream connects a bypass conduit (6) and standard turbo flowmeter group (8), bypass conduit (6) is provided with bypass valve (10), be separately installed with the first pressure unit group (7) on the standard turbo flowmeter group (8), the first temperature transmitter group (9), each line downstream of standard turbo flowmeter group (8) is connected with standard turbo flowmeter valve sets (12) respectively, bypass conduit (6) is by bypass valve (10), each line downstream of standard turbo flowmeter group (8) is connected on second manifold trunk (11) jointly by standard turbo flowmeter valve sets (12) respectively, second manifold trunk (11) downstream connects switch valve (13), switch valve (13) downstream connects stagnation container (14), second temperature transmitter (15) is installed on the stagnation container (14), second pressure unit (16), stagnation container (14) downstream connects sonic nozzle group (17), each line downstream of sonic nozzle group (17) is installed respectively and is connected with the 3rd pressure unit group (18), sonic nozzle valve sets (19), each line downstream of sonic nozzle group (17) is connected on the 3rd manifold trunk (20) jointly by sonic nozzle valve sets (19) respectively, the 3rd manifold trunk (20) downstream is connected with vacuum pump valve sets (28), vacuum pump valve sets (28) is connected respectively on the vacuum pump group (27), second manifold trunk (11) is connected with blower fan valve sets (25), blower fan valve sets (25) downstream is connected respectively on the blower fan group (26), and the air outlet of blower fan group (26) and vacuum pump group (27) is connected respectively on the gas exhaust duct (29);
Tested gauge pressure transmitter (2), tested table temperature transmitter group (3), the first pressure unit group (7), standard turbo flowmeter group (8), the first temperature transmitter group (9), second temperature transmitter (15), second pressure unit (16), the signal output part of the 3rd pressure unit group (18) is connected respectively to the data acquisition end of industrial control computer (21), the control output end of industrial control computer (21) respectively with the electrical input terminal of blower fan valve sets (25), the electrical input terminal of vacuum pump valve sets (28), the electrical input terminal of switch valve (13), the control input end of frequency converter (24) is connected, the signal output part of frequency converter (24) respectively with blower fan group (26) in each blower fan and each vacuum pump in the vacuum pump group (27) be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200778554U CN201225920Y (en) | 2008-07-11 | 2008-07-11 | Gas flow standard device combining acoustic speed nozzle method and standard table method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200778554U CN201225920Y (en) | 2008-07-11 | 2008-07-11 | Gas flow standard device combining acoustic speed nozzle method and standard table method |
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|---|---|
| CN201225920Y true CN201225920Y (en) | 2009-04-22 |
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| CNU2008200778554U Expired - Fee Related CN201225920Y (en) | 2008-07-11 | 2008-07-11 | Gas flow standard device combining acoustic speed nozzle method and standard table method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644627B (en) * | 2009-09-11 | 2011-05-04 | 北京航空航天大学 | Automatic calibration system and automatic calibration method for sonic nozzle |
| CN103471686A (en) * | 2013-09-17 | 2013-12-25 | 陕西天仪智能仪表有限公司 | Gas flow standard device and application method thereof |
| 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 |
| CN104215305A (en) * | 2013-06-04 | 2014-12-17 | 宁夏嘉翔自控技术有限公司 | Full-automatic supersonic nozzle high flow standard device |
| CN104422498A (en) * | 2013-08-30 | 2015-03-18 | 中国石油天然气股份有限公司 | Natural gas flow measuring ring detecting section device capable of reducing natural gas pulsating flow |
| CN104677439A (en) * | 2013-11-29 | 2015-06-03 | 清华大学 | Hydrogen gas flow rate detecting system and hydrogen gas flow rate detecting system |
| CN105466529A (en) * | 2015-11-17 | 2016-04-06 | 金卡高科技股份有限公司 | Combustion gas meter pulsating flow error double-standard detection system and 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 |
| CN109211372A (en) * | 2018-11-12 | 2019-01-15 | 中国计量科学研究院 | Low pressure critical flow venturi nozzle calibrating installation |
| CN111451170A (en) * | 2020-04-17 | 2020-07-28 | 安徽捷迅光电技术有限公司 | Air quantity detection system of nozzle plate |
| CN112097869A (en) * | 2020-09-15 | 2020-12-18 | 辽宁省计量科学研究院 | Mutual checking gas flow standard device and mutual checking method |
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2008
- 2008-07-11 CN CNU2008200778554U patent/CN201225920Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644627B (en) * | 2009-09-11 | 2011-05-04 | 北京航空航天大学 | Automatic calibration system and automatic calibration method for sonic nozzle |
| CN104215305A (en) * | 2013-06-04 | 2014-12-17 | 宁夏嘉翔自控技术有限公司 | Full-automatic supersonic nozzle high flow standard device |
| CN104422498B (en) * | 2013-08-30 | 2018-09-04 | 中国石油天然气股份有限公司 | The natural gas flow measuring circuit for cutting down natural gas Pulsating Flow detects section apparatus |
| CN104422498A (en) * | 2013-08-30 | 2015-03-18 | 中国石油天然气股份有限公司 | Natural gas flow measuring ring detecting section device capable of reducing natural gas pulsating flow |
| CN103471686B (en) * | 2013-09-17 | 2015-12-30 | 陕西天仪智能仪表有限公司 | A kind of gas flow standard device and application process thereof |
| CN103471686A (en) * | 2013-09-17 | 2013-12-25 | 陕西天仪智能仪表有限公司 | Gas flow standard device and application method thereof |
| CN104677439A (en) * | 2013-11-29 | 2015-06-03 | 清华大学 | Hydrogen gas flow rate detecting system and hydrogen gas flow rate detecting system |
| 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 |
| 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 |
| CN105466529A (en) * | 2015-11-17 | 2016-04-06 | 金卡高科技股份有限公司 | Combustion gas meter pulsating flow error double-standard detection system and method |
| CN105466529B (en) * | 2015-11-17 | 2018-09-28 | 金卡智能集团股份有限公司 | The double standard detection systems of gas meter, flow meter pulsation stream error 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 |
| CN109211372A (en) * | 2018-11-12 | 2019-01-15 | 中国计量科学研究院 | Low pressure critical flow venturi nozzle calibrating installation |
| CN111451170A (en) * | 2020-04-17 | 2020-07-28 | 安徽捷迅光电技术有限公司 | Air quantity detection system of nozzle plate |
| CN112097869A (en) * | 2020-09-15 | 2020-12-18 | 辽宁省计量科学研究院 | Mutual checking gas flow standard device and mutual checking method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090422 Termination date: 20100711 |