WO2019000258A1 - 一种气体涡轮流量计的检测装置及检测方法 - Google Patents

一种气体涡轮流量计的检测装置及检测方法 Download PDF

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WO2019000258A1
WO2019000258A1 PCT/CN2017/090471 CN2017090471W WO2019000258A1 WO 2019000258 A1 WO2019000258 A1 WO 2019000258A1 CN 2017090471 W CN2017090471 W CN 2017090471W WO 2019000258 A1 WO2019000258 A1 WO 2019000258A1
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gas turbine
flowmeter
flow
gas
verification
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PCT/CN2017/090471
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张丛
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深圳市樊溪电子有限公司
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters

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  • the invention relates to a detection technology of a flowmeter, in particular to a detection device and a detection method of a gas turbine flowmeter.
  • Turbine flowmeter is the main type of velocity flowmeter.
  • the impeller rotates under force, and its rotational speed is proportional to the average flow velocity of the pipeline.
  • the blade is periodic.
  • the cutting electromagnet generates magnetic lines of force and changes the magnetic flux of the coil.
  • a pulsating potential signal that is, an electric pulse signal
  • the frequency of the electric pulsating signal is proportional to the flow rate of the fluid to be measured.
  • Turbine flowmeters have the advantages of high precision, good repeatability, zero drift, and high turndown ratio.
  • Turbine flowmeters feature high-quality bearings and specially designed baffles, which greatly reduce wear and tear, are insensitive to peaks, and can provide reliable measurement variables even under harsh conditions.
  • the turbine flow meter output is pulsed, easy to digitize, the turbine flowmeter has low pressure loss, the blades are corrosion resistant, and the viscous and corrosive media can be measured.
  • the gas turbine flow meter is a precision flow measuring instrument that can be used to measure the flow and total amount of liquid in conjunction with the corresponding flow meter.
  • Gas turbine flowmeters are widely used in metrology and control systems in petroleum, chemical, metallurgical, scientific research and other fields. Gas turbine flow meters equipped with sanitary joints can be used in the pharmaceutical industry.
  • the working principle of the gas turbine flowmeter is: when the fluid to be measured flows through the sensor, the impeller in the sensor is rotated by the kinetic energy of the fluid, and the impeller periodically changes the magnetic resistance in the magnetoelectric induction system.
  • the value is such that the magnetic flux passing through the coil periodically changes to generate an electrical pulse signal, which is amplified by the amplifier and displayed or transmitted to a corresponding flow totalizer, PLC or host computer for flow or total measurement.
  • the basic structure of the gas turbine flow sensor is shown in Figure 1. It consists mainly of the housing, front guide frame, impeller, rear guide frame, compression ring, fueling system (above DN40) and amplifier or display converter.
  • the integrated gas turbine flowmeter is an explosion-proof design that displays total flow, instantaneous flow and flow full percentage.
  • the battery uses a long-lasting lithium battery.
  • the battery life of the single-function integrated meter can reach more than 5 years, and the battery life of the multi-function display meter can reach more than 12 months.
  • the integrated meter can display a large number of flow units, including cubic meters, gallons, liters, standard cubic meters, standard liters, etc., can set fixed pressure, temperature parameters to compensate for gas, and occasions where pressure and temperature parameters change little.
  • the meter can be used for fixed compensation integration.
  • gas turbine flowmeters have a single standard of measurement environmental conditions.
  • the verification procedures follow different artificial regulations and are not standardized enough to accurately determine the quality of the gas turbine flowmeter and the technical defects of calibration.
  • the object of the present invention is to provide a gas turbine flowmeter detecting device, which uses gas as a medium to verify, calibrate and inspect a gas flowmeter, including a cover body, a liquid tank, a telecommunication generator, a verification tank, a pressure compensation mechanism,
  • the splicer, the air source and the plurality of valves are further composed of a water level gauge and a plurality of test pipelines, wherein the hood and the liquid tank form a variable-volume sealed cavity, and the hood passes through the descending process
  • the pressure compensating mechanism maintains a constant value of the internal gas pressure of the sealed cavity, which does not vary with the depth at which the cover body is immersed in the sealing liquid, and the cover body has two baffles between the baffles
  • the volume is fixed by measuring the time that the two baffles have passed through the telecommunication generator in succession, The instantaneous flow rate of the gas turbine flow meter can be calculated.
  • the cover is movable.
  • the liquid tank is fixed.
  • a pulley, a guide post and an outer guide wheel mechanism are also included for varying the volume of the sealed cavity.
  • the object of the present invention is also achieved by a detection method of a gas turbine flowmeter, comprising the following steps:
  • the turbine flow meter and the front and rear straight pipe sections of the step (2) need to be installed coaxially.
  • the step (3) adjusts the flow point to a 70% flow point of the maximum flow for 5 minutes.
  • the step (4) sets four flow points, which are Qmin, 0.6Qmin, 0.4Qmax, and Qmax, respectively.
  • the mathematical model of the step (5) is to calculate the meter coefficient and the propagation rate of the i-th measuring flowmeter.
  • the device and method adopt a positive pressure method, and a certain volume of a standard gas flows through a turbine flowmeter, thereby realizing verification of the flowmeter, and the flow range of the flow itself is relatively small, and is suitable for verifying a flowmeter with a small diameter. It conforms to the state of the flowmeter in actual work and standardizes the verification work.
  • FIG. 1 is a schematic structural view of a gas turbine flow meter according to the prior art
  • FIG. 2 is a schematic structural view of a gas turbine flowmeter detecting device according to an embodiment of the present invention
  • FIG. 3 is a flow chart of a method for detecting a gas turbine flow meter in accordance with an embodiment of the present invention.
  • a gas turbine flow meter detecting device uses a gas as a medium to calibrate, calibrate and inspect a gas flow meter, including a cover 1, a liquid tank 2, a telecommunication generator 3, an assay tank 4, and a pressure.
  • the compensation mechanism 5, the splicer 6, the air source 7 and the plurality of valves 8, 9, 10, 11, 12, 13 are also composed of a water level gauge and a plurality of test pipelines (not shown), and the cover body can be Moving, the liquid tank is fixed, and the cover body and the liquid tank form a variable-volume sealed cavity, and the volume of the sealing cavity is changed by the pulley, the guide post and the outer guide wheel mechanism, and the pressure is passed during the falling of the cover body.
  • the compensation mechanism maintains the internal gas pressure of the sealed cavity to a certain value, which does not change according to the depth at which the cover body is immersed in the sealing liquid, and the cover body has two baffles, and the volume between the baffles is fixed, and the measurement is performed.
  • the instantaneous flow rate of the gas turbine flow meter can be calculated by the time that the two baffles pass through the telecommunication generator.
  • a gas turbine flow meter detection method including the following steps: (1) setting measurement conditions, including atmospheric temperature, atmospheric relative humidity, atmospheric pressure, medium temperature for verification, Power supply voltage, power supply frequency; (2) Under the specified measurement conditions, according to the JJG1037-2008 turbine flowmeter verification procedure, the turbine flowmeter is installed on the detection device, and the turbine flowmeter and the front and rear straight pipe sections need to be coaxially installed; (3) Using air as the verification medium, adjust the flow point to 70% of the maximum flow rate, run for 5 minutes, wait for the medium temperature, pressure and flow to stabilize and then perform formal verification; (4) Set multiple 1.5 according to the verification procedure.
  • the turbine flowmeter verifies the flow point and sets four flow points, which are Qmin, 0.6Qmin, 0.4Qmax, Qmax.
  • the ratio of the detected flowmeter pulse signal measured by jth point to the standard volume flow rate measured by the standard gas flow device at this point is taken as the meter coefficient measured at the jth point of the i-th point; (5) establishing a mathematical model And evaluating a relative uncertainty of the input amount of the detecting device of the gas turbine flow meter to determine a quality level of the gas turbine flow meter, and the mathematical model is for calculating the meter coefficient of the i-th measuring flowmeter to be detected and transmitting Rate.
  • K is the meter factor of the i-th measurement of the flowmeter to be inspected, (m 3 ) -1
  • N i is the number of pulses measured by the meter for the i-th measurement of the measured flow meter
  • V i is the cumulative flow rate of the i-th measuring device, m 3
  • the rate of transmission is:
  • the device and method adopt a positive pressure method, and a certain volume of standard gas flows through the turbine flowmeter, thereby realizing verification of the flowmeter, and the flow range of the flow itself is relatively small, and is suitable for verifying a flowmeter with a small diameter, conforming to the flowmeter.
  • the state of actual work standardizes the verification work.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

一种气体涡轮流量计的检测装置，采用气体为介质，包括罩体(1)、液槽(2)，电讯发生器(3)、检定槽(4)、压力补偿机构(5)、接槽器(6)、气源(7)以及多个阀门(8，9，10，11，12，13)，水位计和多条试验管路，罩体(1)和液槽(2)构成一个容积可变的密封空腔，罩体(1)下降过程中通过压力补偿机构(5)使得所密封空腔的内部气体压力保持一定值，不随罩体(1)浸入密封液中的深度而变化，罩体(1)具有两个挡板，挡板之间的容积是固定的，通过测量两个挡板先后通过电讯发生器(3)经历的时间，可计算出瞬时流速。使用该检测装置的气体涡轮流量计检测方法，将该检测过程标准化。

Description

一种气体涡轮流量计的检测装置及检测方法 技术领域
本发明涉及流量计的检测技术，特别是一种气体涡轮流量计的检测装置及检测方法。
背景技术
涡轮流量计是速度式流量计中的主要种类，当被测流体流过涡轮流量传感器时，在流体的作用下，叶轮受力旋转，其转速与管道平均流速成正比，同时，叶片周期性的切割电磁铁产生磁力线，改变线圈的磁通量，根据电磁感应原理，在线圈内将感应出脉动的电势信号，即电脉冲信号，此电脉动信号的频率与被测流体的流量成正比。涡轮流量计具有精度高、重复性好、无零点漂移、高量程比的优点。涡轮流量计拥有高质量轴承、特别设计的导流片，因此极大降低了磨损，对峰值不敏感，甚至恶劣的条件下也可以给出可靠的测量变量。涡轮流量计输出信号为脉冲，易于数字化，涡轮流量计压力损失小，叶片能防腐，可以测量粘稠和腐蚀性的介质。
气体涡轮流量计是一种精密流量测量仪表，与相应的流量积算仪表配套可用于测量液体的流量和总量。气体涡轮流量计广泛用于石油、化工、冶金、科研等领域的计量、控制***。配备有卫生接头的气体涡轮流量计可以应用于制药行业。气体涡轮流量计工作原理为：当被测流体流经传感器时，传感器内的叶轮借助于流体的动能而产生旋转，叶轮即周期性地改变磁电感应***中的磁阻 值，使通过线圈的磁通量周期性地发生变化而产生电脉冲信号，经放大器放大后进行显示或传送至相应的流量积算仪表、PLC或上位计算机，进行流量或总量的测量。气体涡轮流量传感器的基本结构如图1所示，它主要由壳体、前导向架、叶轮、后导向架、压紧圈、加油***(DN40以上)和放大器或显示转换器等组成。
一体化气体涡轮流量计结构为防爆设计，可以显示流量总量，瞬时流量和流量满度百分比。电池采用长效锂电池，单功能积算表电池使用寿命可达5年以上，多功能显示表电池使用寿命也可达到12个月以上。一体化表头可以显示的流量单位众多，有立方米，加仑，升，标准立方米，标准升等，可以设定固定压力、温度参数对气体进行补偿，对压力和温度参数变化不大的场合，可使用该仪表进行固定补偿积算。
然而，目前气体涡轮流量计存在测量环境条件单一不标准，检定规程遵循不同的人为规定，不够标准化，从而无法准确判定气体涡轮流量计的质量，也无法对其校准的技术缺陷。
发明内容
本发明的目的在于提供一种气体涡轮流量计的检测装置，采用气体为介质，对气体流量计进行检定、校准和检验，包括罩体、液槽，电讯发生器、检定槽、压力补偿机构、接槽器、气源以及多个阀门组成，还包括水位计和多条试验管路，所述罩体和所述液槽构成一个容积可变的密封空腔，所述罩体下降过程中通过所述压力补偿机构使得所述密封空腔的内部气体压力保持一定值，不随所述罩体浸入密封液中的深度而变化，所述罩体具有两个挡板，所述挡板之间的容积是固定的，通过测量所述两个挡板先后通过所述电讯发生器经历的时间， 可计算出所述气体涡轮流量计的瞬时流速。
优选的，所述罩体是可移动的。
优选的，所述液槽是固定的。
优选的，还包括滑轮，导柱和外导轮机构，用于改变所述密封空腔的容积。
本发明的目的还通过一种气体涡轮流量计的检测方式实现，包括如下步骤：
(1)设定测量条件，包括大气温度，大气相对湿度，大气压力，检定用介质温度，电源电压，电源频率；
(2)在规定的测量条件下，按照JJG1037-2008涡轮流量计检定规程，将涡轮流量计安装在所述检测装置上；
(3)以空气为检定介质，调节流量点至最大流量的一定百分比处，运行一定时间，等待介质温度、压力和流量稳定后进行正式检定；
(4)依据检定规程，设定多个1.5级的涡轮流量计检定流量点，将在第i点第j次测得的被检流量计脉冲信号与标准气体流量装置在该点该次测得得标准体积流量之比作为第i点第j次测量的仪表系数；
(5)建立数学模型，评价所述气体涡轮流量计的检测装置输入量的相对不确定度从而确定所述气体涡轮流量计的质量等级。
优选的，所述步骤(2)所述涡轮流量计与前后直管段需要同轴安装。
优选的，所述步骤(3)调节流量点至最大流量的70％流量点，运行5分钟。
优选的，所述步骤(4)设定四个流量点，分别为Qmin，0.6Qmin，0.4Qmax，Qmax。
优选的，所述步骤(4)对于量程比<20：1的流量计，分界流量0.6Qmin＝0.2Qmax。
优选的，所述步骤(5)的数学模型为计算第i次测量被检流量计的仪表系数以及传播率。
该装置和方法采用正压法，用一定体积量的标准气体流经涡轮流量计，从而实现对流量计的检定，其本身流量范围比较小，适合检定口径较小的流量计， 符合流量计在实际工作中的状态，将检定工作标准化。
根据下文结合附图对本发明具体实施例的详细描述，本领域技术人员将会更加明了本发明的上述以及其他目的、优点和特征。
附图说明
后文将参照附图以示例性而非限制性的方式详细描述本发明的一些具体实施例。附图中相同的附图标记标示了相同或类似的部件或部分。本领域技术人员应该理解，这些附图未必是按比例绘制的。本发明的目标及特征考虑到如下结合附图的描述将更加明显，附图中：
图1为根据现有技术的气体涡轮流量计结构示意图；
图2为根据本发明实施例的气体涡轮流量计检测装置结构示意图；
图3为根据本发明实施例的气体涡轮流量计检测方法流程图。
具体实施方式
参见附图2，一种气体涡轮流量计的检测装置，采用气体为介质，对气体流量计进行检定、校准和检验，包括罩体1、液槽2，电讯发生器3、检定槽4、压力补偿机构5、接槽器6、气源7以及多个阀门8，9，10，11，12，13组成，还包括水位计和多条试验管路(图中没有示出)，罩体可移动，液槽是固定的，罩体和液槽构成一个容积可变的密封空腔，通过滑轮，导柱和外导轮机构来改变所述密封空腔的容积，罩体下降过程中通过压力补偿机构使得所述密封空腔的内部气体压力保持一定值，不随所述罩体浸入密封液中的深度而变化，罩体具有两个挡板，挡板之间的容积是固定的，通过测量两个挡板先后通过电讯发生器经历的时间，可计算出气体涡轮流量计的瞬时流速。
参见附图3，一种气体涡轮流量计的检测方式实现，包括如下步骤：(1)设定测量条件，包括大气温度，大气相对湿度，大气压力，检定用介质温度， 电源电压，电源频率；(2)在规定的测量条件下，按照JJG1037-2008涡轮流量计检定规程，将涡轮流量计安装在所述检测装置上，涡轮流量计与前后直管段需要同轴安装；(3)以空气为检定介质，调节流量点至最大流量的70％流量点，运行5分钟，等待介质温度、压力和流量稳定后进行正式检定；(4)依据检定规程，设定多个1.5级的涡轮流量计检定流量点，设定四个流量点，分别为Qmin，0.6Qmin，0.4Qmax，Qmax，对于量程比<20：1的流量计，分界流量0.6Qmin＝0.2Qmax，将在第i点第j次测得的被检流量计脉冲信号与标准气体流量装置在该点该次测得得标准体积流量之比作为第i点第j次测量的仪表系数；(5)建立数学模型，评价所述气体涡轮流量计的检测装置输入量的相对不确定度从而确定所述气体涡轮流量计的质量等级，数学模型为计算第i次测量被检流量计的仪表系数以及传播率。
其中K＝Ni/Vi，                          (1)
K为第i次测量被检流量计的仪表系数，(m3)-1
Ni为第i次测量被测流量计显示仪表测得的脉冲数；
Vi为第i次测量装置的累积流量，m3
传播率为：
Figure PCTCN2017090471-appb-000001
在大气温度为(23.5±1)oc，大气相对湿度为(38±1)％RH，大气压(94.5±0.5)kPa，检定用介质温度(18.5±0.1)oc，电源电压为220V，电源频率50Hz的测量环境条件下，用一台0.5-120m3/h，DN25mm的气体涡轮流量计进行检定，流量选择在最大流量70％处测量60秒，累积流量250L，用工控测量设备连续测量6次得到一组测量列，获得单次试验标准差为10.13，取3平均值不确定度为0.15％，结合厂家给出的该气体涡轮流量计的扩展不确定度和系数，得到合成相对标准不确定度为0.21％。然而在其他给定测量流量点进行测量分别获得上述数值后，去测量接过重复性作为最大值，扩展不确定度为0.42％，在该扩展不确定度之 下的为标准合格气体涡轮流量计。
该装置和方法采用正压法，用一定体积量的标准气体流经涡轮流量计，从而实现对流量计的检定，其本身流量范围比较小，适合检定口径较小的流量计，符合流量计在实际工作中的状态，将检定工作标准化。
虽然本发明已经参考特定的说明性实施例进行了描述，但是不会受到这些实施例的限定而仅仅受到附加权利要求的限定。本领域技术人员应当理解可以在不偏离本发明的保护范围和精神的情况下对本发明的实施例能够进行改动和修改。

Claims (10)

  1. 一种气体涡轮流量计的检测装置，采用气体为介质，对气体流量计进行检定、校准和检验，其特征在于：包括罩体(1)、液槽(2)，电讯发生器(3)、检定槽(4)、压力补偿机构(5)、接槽器(6)、气源(7)以及多个阀门(8，9，10，11，12，13)组成，还包括水位计和多条试验管路，所述罩体(1)和所述液槽(2)构成一个容积可变的密封空腔，所述罩体(1)下降过程中通过所述压力补偿机构(5)使得所述密封空腔的内部气体压力保持一定值，不随所述罩体(1)浸入密封液中的深度而变化，所述罩体(1)具有两个挡板，所述挡板之间的容积是固定的，通过测量所述两个挡板先后通过所述电讯发生器(3)经历的时间，可计算出所述气体涡轮流量计的瞬时流速。
  2. 根据权利要求1所述的一种气体涡轮流量计的检测装置，其特征在于：所述罩体(1)是可移动的。
  3. 根据权利要求1所述的一种气体涡轮流量计的检测装置，其特征在于：所述液槽(2)是固定的。
  4. 根据权利要求1所述的一种气体涡轮流量计的检测装置，其特征在于：还包括滑轮，导柱和外导轮机构，用于改变所述密封空腔的容积。
  5. 一种使用如权利要求1-4中任一一个检测装置进行的气体涡轮流量计的检测方法，其特征在于包括如下步骤：
    (1)设定测量条件，包括大气温度，大气相对湿度，大气压力，检定用介质温度，电源电压，电源频率；
    (2)在规定的测量条件下，按照JJG1037-2008涡轮流量计检定规程，将涡轮流量计安装在所述检测装置上；
    (3)以空气为检定介质，调节流量点至最大流量的一定百分比处，运行一定时间，等待介质温度、压力和流量稳定后进行正式检定；
    (4)依据检定规程，设定多个1.5级的涡轮流量计检定流量点，将在第i点第j次测得的被检流量计脉冲信号与标准气体流量装置在该点该次测得得标 准体积流量之比作为第i点第j次测量的仪表系数；
    (5)建立数学模型，评价所述气体涡轮流量计的检测装置输入量的相对不确定度从而确定所述气体涡轮流量计的质量等级。
  6. 根据权利要求5所述的气体涡轮流量计的检测方法，其特征在于：所述步骤(2)所述涡轮流量计与前后直管段需要同轴安装。
  7. 根据权利要求5所述的气体涡轮流量计的检测方法，其特征在于：所述步骤(3)调节流量点至最大流量的70％流量点，运行5分钟。
  8. 根据权利要求5所述的气体涡轮流量计的检测方法，其特征在于：所述步骤(4)设定四个流量点，分别为Qmin，0.6Qmin，0.4Qmax，Qmax。
  9. 根据权利要求5所述的气体涡轮流量计的检测方法，其特征在于：所述步骤(4)对于量程比<20：1的流量计，分界流量0.6Qmin＝0.2Qmax。
  10. 根据权利要求5所述的气体涡轮流量计的检测方法，其特征在于：所述步骤(5)的数学模型为计算第i次测量被检流量计的仪表系数以及传播率。
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