CN204085645U - With the gas flow standard device of self calibration structure - Google Patents

With the gas flow standard device of self calibration structure Download PDF

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Publication number
CN204085645U
CN204085645U CN201420599623.0U CN201420599623U CN204085645U CN 204085645 U CN204085645 U CN 204085645U CN 201420599623 U CN201420599623 U CN 201420599623U CN 204085645 U CN204085645 U CN 204085645U
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China
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standard device
gas
gas flow
calibration
flow standard
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CN201420599623.0U
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Inventor
裴海琴
王五一
张志强
高春昱
赵彩琳
白新文
张晓红
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SHANXI INSTITUTE OF METROLOGY
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SHANXI INSTITUTE OF METROLOGY
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Abstract

The utility model relates to gas flow standard device, is specially the gas flow standard device with self calibration structure.Solving calibrating gas turbo flow meter in existing gas flow standard device when calibrating, must disassemble, thus cause calibration difficulties, calibration costly, problem that calibration efficiency is low.Comprise gas flow standard device body, gas flow standard device body comprises measurement branch road; Also comprise alignment unit, alignment unit comprises gas ring vacuum pump, the input end of gas ring vacuum pump is connected with the exit vessel which is provided with absolute pressure transmitter by the road, exit vessel is through multiple calibration branch road parallel with one another, that be made up of the second operation valve and critical flow venturi nozzle, be connected with the stagnation container which is provided with absolute pressure transmitter, stagnation container is connected with the one end measuring branch road through calibration pipeline section.The utility model, by setting up alignment unit, makes the calibrating gas turbo flow meter on it can on-line calibration.

Description

With the gas flow standard device of self calibration structure
Technical field
The utility model relates to the calibration equipment of gas turbine meter---and gas flow standard device, is specially the gas flow standard device with self calibration structure.
Background technology
Gas flow standard device is a kind of standard set-up for detecting gas turbine meter.As shown in Figure 1, gas flow standard device comprises calibrating pipeline section 12, one end of calibrating pipeline section 12 is connected with collecting pipe 10, collecting pipe 10 is also connected with the measurement branch road that at least one is connected in series by absolute pressure transmitter 5, calibrating gas turbo flow meter 8, temperature transmitter 6 and the first operation valve 9, each other end measuring branch road is all connected with high pressure positive blower 14.During use, detected gas meter is connected on calibrating pipeline section 12, start high pressure positive blower 14, and the first operation valve 9 opened on one (or several) measurement branch road, whether the reading observing detected gas meter is consistent with the reading of calibrating gas turbo flow meter 8, thus determines that whether the gas meter be detected is accurate.Measure absolute pressure transmitter 5 on branch road and temperature transmitter 6 mainly detect the change in testing process of the temperature of gas medium and pressure and compensate measured value.
According to the relevant regulations of national measurement laws and regulations, calibrating gas turbo flow meter in gas flow standard device 8 must annual period regulation once, to prevent because of standard scale inaccurate misinterpretation gas flowmeter body.Under prior art conditions, when calibrating the calibrating gas turbo flow meter on gas flow standard device, the calibration steps adopted is as follows: first disassembled from gas flow standard device by calibrating gas turbo flow meter, then utilize in laboratory malleation or negative pressure method gas flow standard device to calibrate calibrating gas turbo flow meter.The shortcoming of above-mentioned calibration steps is: need annual dismounting calibrating gas turbo flow meter, and be sent to the laboratory investment of this qualification, cause calibration thus costly, and inconvenient operation, affect calibration efficiency.
Summary of the invention
The utility model is in order to solve calibrating gas turbo flow meter in existing gas flow standard device when calibrating, must disassemble, thus cause calibration difficulties, calibration costly, problem that calibration efficiency is low, a kind of gas flow standard device with self calibration structure is provided.This device can realize the on-line calibration of calibrating gas turbo flow meter.
The utility model adopts following technical scheme to realize: with the gas flow standard device of self calibration structure, comprise gas flow standard device body, gas flow standard device body comprises the measurement branch road it being serially connected with calibrating gas turbo flow meter, the first operation valve; Also comprise alignment unit, alignment unit comprises the gas ring vacuum pump with variable-frequence governor, the input end of gas ring vacuum pump is connected with the exit vessel which is provided with absolute pressure transmitter by the road, exit vessel is through multiple calibration branch road parallel with one another, that be made up of the second operation valve and critical flow venturi nozzle, be connected with the stagnation container which is provided with absolute pressure transmitter, stagnation container is connected with the one end (one end be namely connected with high pressure positive blower) measuring branch road through calibration pipeline section.
When calibrating gas turbo flow meter needs calibration, the first operation valve measured residing for the calibrating gas turbo flow meter that need calibrate on branch road is opened (other first operation valves measured on branch road are closed).According to the uninterrupted of the calibrating gas turbo flow meter that need calibrate, the second operation valve on one or several calibration branch road is opened, carries out different critical flow venturi nozzles and combinationally use, determine required calibrated fluxes.Gas ring vacuum pump is started during calibration, air is by gas flow standard device body (namely through the calibrating pipeline section of gas flow standard device body, collecting pipe, absolute pressure transmitter, the calibrating gas turbo flow meter that need calibrate, temperature transmitter and the first operation valve), after entering stagnation container, flow through critical flow venturi nozzle and the second operation valve, exit vessel, the gas ring vacuum pump of selected calibration branch road, be finally expelled back in air.The rotating speed of gas ring vacuum pump is regulated by variable-frequence governor, and calculate the ratio (the back pressure ratio of nozzle) of the absolute pressure transmitter reading on exit vessel and stagnation container, when this ratio is less than or equal to the critical pressure ratio of selected nozzle, nozzle throat flow velocity reaches velocity of sound flowing; Now, the output valve of the value exported by Nozzle combination and the calibrating gas turbo flow meter that need calibrate is compared, if the output valve of the two is consistent, then illustrate that the calibrating gas turbo flow meter that need calibrate is qualified, if the output valve of the two is inconsistent, then illustrate that the calibrating gas turbo flow meter that need calibrate is defective, realizes the on-line calibration to calibrating gas turbo flow meter thus.
Further, the pipeline between gas ring vacuum pump and exit vessel is also connected with the buffer container of band regulator.Buffer container can ensure that the gas of access to plant is relatively stable and guarantee to form critical flow state at nozzle throat.
The utility model by setting up alignment unit in gas flow standard device, make himself to be provided with calibration function, calibrating gas turbo flow meter on it can on-line calibration, without the need to dismounting, make the faster convenience of calibration of the calibrating gas turbo flow meter in gas flow standard device, thus efficiently solve gas flow standard device Plays gas turbine meter calibration difficulties, calibration costly, problem that calibration efficiency is low.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure: 1-gas ring vacuum pump, 2-buffer container, 3-exit vessel, 4-critical flow venturi nozzle, 5-absolute pressure transmitter, 6-temperature transmitter, 7-stagnation container, 8-calibrating gas turbo flow meter, 9-first operation valve, 10-collecting pipe, 11-calibration pipeline section, 12-calibrating pipeline section, 13-second operation valve, 14-high pressure positive blower.
Embodiment
With the gas flow standard device of self calibration structure, comprise gas flow standard device body, gas flow standard device body comprises the measurement branch road it being serially connected with calibrating gas turbo flow meter 8, first operation valve 9; Also comprise alignment unit, alignment unit comprises the gas ring vacuum pump 1 with variable-frequence governor, the input end of gas ring vacuum pump 1 is connected with the exit vessel 3 which is provided with absolute pressure transmitter 5 by the road, exit vessel 3 is through multiple calibration branch road parallel with one another, that be made up of the second operation valve 13 and critical flow venturi nozzle 4, be connected with the stagnation container 7 which is provided with absolute pressure transmitter 5, stagnation container 7 is connected with the one end (one end be namely connected with high pressure positive blower 14) measuring branch road through calibration pipeline section 11.Pipeline between gas ring vacuum pump 1 and exit vessel 3 is also connected with the buffer container 2 being with regulator.Stagnation container 7 is provided with temperature transmitter 6, for observing the temperature in stagnation container 7.During concrete enforcement, absolute pressure transmitter 5, temperature transmitter 6 adopt plug-in type mount fixing structure, and namely absolute pressure transmitter 5, temperature transmitter 6 plug-in type are arranged on stagnation container and exit vessel.

Claims (4)

1. with a gas flow standard device for self calibration structure, comprise gas flow standard device body, gas flow standard device body comprises the measurement branch road it being serially connected with calibrating gas turbo flow meter (8), the first operation valve (9); Characterized by further comprising alignment unit, alignment unit comprises the gas ring vacuum pump (1) with variable-frequence governor, the input end of gas ring vacuum pump (1) is connected with the exit vessel (3) which is provided with absolute pressure transmitter (5) by the road, exit vessel (3) is through multiple calibration branch road parallel with one another, that be made up of the second operation valve (13) and critical flow venturi nozzle (4), be connected with the stagnation container (7) which is provided with absolute pressure transmitter (5), stagnation container (7) is connected with the one end measuring branch road through calibration pipeline section (11).
2. the gas flow standard device with self calibration structure according to claim 1, is characterized in that the pipeline between gas ring vacuum pump (1) and exit vessel (3) being also connected with the buffer container (2) being with regulator.
3. the gas flow standard device with self calibration structure according to claim 1 and 2, is characterized in that being provided with temperature transmitter (6) on stagnation container (7).
4. the gas flow standard device with self calibration structure according to claim 3, is characterized in that absolute pressure transmitter (5), temperature transmitter (6) adopt plug-in type mount fixing structure.
CN201420599623.0U 2014-10-17 2014-10-17 With the gas flow standard device of self calibration structure Active CN204085645U (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN106197585A (en) * 2016-06-23 2016-12-07 安徽埃克森科技集团有限公司 A kind of thermal flowmeter
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
CN108827407A (en) * 2018-04-08 2018-11-16 广州能源检测研究院 A kind of regulating device and adjusting method of automatic-balancing system back pressure ratio
CN109506744A (en) * 2018-12-10 2019-03-22 中国航发四川燃气涡轮研究院 A kind of aero-engine overall test Venturi nozzle air mass flow calibration method
CN110686758A (en) * 2019-09-26 2020-01-14 西安航天计量测试研究所 Sound velocity nozzle gas flow standard device capable of switching pressure sources and control method thereof
CN110836713A (en) * 2019-11-21 2020-02-25 中国空气动力研究与发展中心低速空气动力研究所 Venturi flow coefficient calibration method considering gas mass change of calibration box
CN111854860A (en) * 2019-04-26 2020-10-30 中国石油天然气股份有限公司 Natural gas flowmeter calibrating device and method

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN106197585A (en) * 2016-06-23 2016-12-07 安徽埃克森科技集团有限公司 A kind of thermal flowmeter
CN106197585B (en) * 2016-06-23 2018-01-30 安徽埃克森科技集团有限公司 A kind of thermal flowmeter
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
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
CN108827407A (en) * 2018-04-08 2018-11-16 广州能源检测研究院 A kind of regulating device and adjusting method of automatic-balancing system back pressure ratio
CN109506744A (en) * 2018-12-10 2019-03-22 中国航发四川燃气涡轮研究院 A kind of aero-engine overall test Venturi nozzle air mass flow calibration method
CN111854860A (en) * 2019-04-26 2020-10-30 中国石油天然气股份有限公司 Natural gas flowmeter calibrating device and method
CN111854860B (en) * 2019-04-26 2022-02-01 中国石油天然气股份有限公司 Natural gas flowmeter calibrating device and method
CN110686758A (en) * 2019-09-26 2020-01-14 西安航天计量测试研究所 Sound velocity nozzle gas flow standard device capable of switching pressure sources and control method thereof
CN110836713A (en) * 2019-11-21 2020-02-25 中国空气动力研究与发展中心低速空气动力研究所 Venturi flow coefficient calibration method considering gas mass change of calibration box

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