WO2014127670A1 - 一种流量计 - Google Patents

一种流量计 Download PDF

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Publication number
WO2014127670A1
WO2014127670A1 PCT/CN2013/090205 CN2013090205W WO2014127670A1 WO 2014127670 A1 WO2014127670 A1 WO 2014127670A1 CN 2013090205 W CN2013090205 W CN 2013090205W WO 2014127670 A1 WO2014127670 A1 WO 2014127670A1
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WO
WIPO (PCT)
Prior art keywords
detection electrode
electrode
present
measuring tube
detecting electrode
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PCT/CN2013/090205
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English (en)
French (fr)
Inventor
孙晓君
Original Assignee
Sun Xiaojun
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Publication of WO2014127670A1 publication Critical patent/WO2014127670A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/584—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of electrodes, accessories therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/588—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters combined constructions of electrodes, coils or magnetic circuits, accessories therefor

Definitions

  • the present invention relates to the field of liquid flow measurement, and more particularly to a flow meter for high precision fluid flow measurement. Background technique
  • Electromagnetic Flowmeter is a measuring instrument used to measure the volumetric flow of a conductive liquid according to Faraday's law of electromagnetic induction. It consists of a sensor and a transducer that directly contact the fluid to be measured. A magnetic field is applied on both sides of the measuring tube of the electromagnetic flowmeter, and the magnetic field is cut when the measured medium flows through the measuring tube, and an induced electromotive force is generated on the detecting electrode of the outer wall of the measuring tube, the magnitude of which is proportional to the average flow velocity of the fluid, and thus the fluid can be measured. flow.
  • the electromagnetic flowmeter in the prior art adopts a coil excitation mode, has a complicated structure and is difficult to assemble, and the device itself has a relatively large scale.
  • the object of the present invention is to provide a permanent magnet capacitive flowmeter, which has the advantages of low power consumption, low nonlinearity, strong anti-interference ability, and wide applicability.
  • One aspect of the present invention provides a flow meter, comprising: an upper magnet (1) and a lower magnet disposed on the upper and lower sides of the outer wall of the measuring tube ( 2 ) a left detecting electrode (3) and a right detecting electrode (4) mounted on left and right sides of the outer wall of the measuring tube, wherein the left detecting electrode (3) and the right detecting electrode (4) are connected to a signal processing circuit;
  • the left detecting electrode (3) is provided with a left shielding electrode (5) and a left shielding ring (7)
  • the right detecting electrode (4) is provided with a right shielding electrode (6) and a right shielding ring (8).
  • the left detecting electrode (3) and the right detecting electrode (4) are all elliptical in shape to form a constant capacitance.
  • the upper magnet (1) and the lower magnet (2) are permanent magnets for providing a constant magnetic field.
  • the invention adopts a permanent magnet to provide a constant magnetic field, does not require an excitation circuit, has a single structure, and has low power consumption, and is suitable for a two-wire power supply application requirement;
  • the invention adopts an elliptical shape detecting electrode to ensure the constant capacitance between the detecting electrodes, thereby ensuring the uniformity of the electric field, reducing the nonlinearity, reducing the interference of the granular noise, and improving the anti-interference ability, and can be widely used. It is used for flow measurement of various liquid-solid two-phase fluids such as mud, pulp and the like.
  • FIG. 1 is a structural diagram of a flow meter according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a detecting electrode in a flow meter according to an embodiment of the present invention
  • FIG. 3 is a front view of a flow meter according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of electric field distribution in a flow meter according to an embodiment of the present invention. detailed description
  • FIG. 1 an embodiment of the present invention provides a flow meter, which can be seen from the figure.
  • the flow meter comprises: an upper magnet 1 and a lower magnet 2 mounted on the upper and lower sides of the outer wall of the measuring tube, a left detecting electrode 3, a right detecting electrode 4 mounted on the left and right sides of the outer wall of the measuring tube, and a left detecting electrode 3, a signal processing circuit 9 connected to the right detecting electrode 4, a left shield electrode 5 and a left shield ring 7 mounted outside the left detecting electrode 3, and a right shielding electrode 6 and a right shielding ring 8 which are mounted outside the right detecting electrode 4.
  • the upper magnet 1 and the lower magnet 2 are permanent magnets and provide a constant magnetic field.
  • the left detecting electrode 3 and the right detecting electrode 4 in the present invention are all elliptical in shape.
  • the capacitance C is proportional to the area of the capacitor plate, and the distance becomes d.
  • the two pairs of electrodes are symmetric with respect to the center, and the upper distance is gradually reduced. Therefore, when the electrodes are designed, the symmetrical area is also reduced.
  • the left and right detecting electrodes are designed to have an elliptical shape, which is ensured as much as possible. The capacitance between the two detection electrodes is constant to ensure the uniformity of the electric field.
  • the upper magnet 1 and the lower magnet 2 provide a magnetic field.
  • the fluid cutting magnetic line When the fluid flows in the measuring tube, the fluid cutting magnetic line generates an induced electromotive force whose magnitude is proportional to the average flow velocity of the fluid.
  • the left detecting electrode 3 and the right detecting electrode 4 mounted on the outer wall of the measuring tube are orthogonal to the upper magnet 1 and the lower magnet 2, and the left detecting electrode 3 and the right detecting electrode 4 form a capacitance using the fluid and the measuring tube wall as a medium.
  • the change in capacitance between the left and right detection electrodes provides a signal related to the average flow velocity of the fluid, thereby achieving fluid flow measurement.
  • the invention adopts a permanent magnet to provide a constant magnetic field, does not require an excitation circuit, has a single structure, and has low power consumption, and is suitable for a two-wire power supply application requirement;
  • the invention adopts an elliptical shape detecting electrode to ensure the constant capacitance between the detecting electrodes, thereby ensuring the uniformity of the electric field, reducing the nonlinearity, reducing the interference of the granular noise, and improving the anti-interference ability, and can be widely used. It is used for flow measurement of various liquid-solid two-phase fluids such as mud, pulp and the like.

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

Abstract

一种流量计，包括：安装在测量管外壁上、下两侧的上磁铁（1）、下磁铁（2），安装在测量管外壁左、右两侧的左检测电极（3）、右检测电极（4），与左检测电极（3）和右检测电极（4）相连接的信号处理电路（9），安装在左检测电极（3）外的左屏蔽电极（5）、左屏蔽环（7），安装在右检测电极（4）外的右屏蔽电极（6）、右屏蔽环（8）。该流量计功耗低，非线性小，抗干扰能力强，适用范围较广。

Description

一种流量计
技术领域
本发明涉及一种液体流量测量领域， 特别涉及一种用于高精度流体流 量测量的流量计。 背景技术
流体的流量测量在工业过程控制领域占有极其重要的地位。 电磁流量 计（ Electromagnetic Flowmeter )是根据法拉第电磁感应定律用来测量导 电性液体体积流量的测量仪表， 由直接接触被测流体的传感器和转换器组 成。 在电磁流量计测量管的两侧施加磁场， 被测介质流过测量管时切割磁 力线， 在测量管外壁的检测电极上产生感应电动势， 其大小正比于流体的 平均流速， 进而可以测得流体的流量。
现有技术中的电磁流量计， 采用线圈励磁方式， 结构复杂且装配困难， 设备本身规模比较大。
因此， 本发明的目的是设计一种结构筒单， 装配容易， 功耗低， 非线 性小的电磁流量计。 发明内容
有鉴于此，本发明的目的是提供一种永磁电容式流量计，具有功耗低、 非线性小、 抗干扰能力强， 适用性较广的优点。
为实现上述目的， 本发明采用了如下的技术方案： 本发明一方面提供一种流量计， 所述流量计包括: 设置在测量管外壁上、 下两侧的上磁铁 （1 ) 、 下磁铁（2 ) 安装在测量管外壁左、 右两侧的左检测电极（3)、 右检测电极（4) , 所述左检测电极（3) 和所述右检测电极 （4) 均与信号处理电路连接； 所述左检测电极（3) 外设置有左屏蔽电极 （5) 和左屏蔽环 （7) , 所述右检测电极（4) 外设置有右屏蔽电极（6) 、 右屏蔽环 （8) ； 所述左检测电极（ 3 ) 、 右检测电极（ 4 ) 均为椭圆形状， 用以形成恒 定的电容。 依照本发明较佳实施例所述的永磁电容式流量计， 所述上磁铁（1 ) 、 下磁铁（2) 均为永久磁铁， 用以提供恒定的磁场。
( 1 ) 本发明采用永久磁铁提供恒定的磁场， 不需要激励电路， 结构 筒单， 功耗低， 适合于两线制供电应用需求场合；
(2) 本发明采用椭圆形状的检测电极， 尽量保证检测电极之间电容 的恒定， 进而保证电场的均匀性， 降低了非线性， 减小了粒状噪声的干扰， 提高了抗干扰能力， 可广泛应用于各种液固二相流体， 如泥浆、 纸浆等的 流量测量。 附图说明
图 1为本发明实施例提供的流量计的结构图；
图 2为本发明实施例提供的流量计中检测电极示意图；
图 3为本发明实施例提供的流量计中主视图；
图 4为本发明实施例提供的流量计中的电场分布示意图。 具体实施方式
下面通过附图和实施例， 对本发明的技术方案做进一步的详细描述。 以下结合附图， 对本发明实施例做进一步详细叙述。 如图 1所示， 本发明实施例提供了一种流量计， 由图可见。 所述流量 计包括： 安装在测量管外壁上、 下两侧的上磁铁 1、 下磁铁 2, 安装在测 量管外壁左、 右两侧的左检测电极 3、 右检测电极 4, 与左检测电极 3和 右检测电极 4相连接的信号处理电路 9 , 安装在左检测电极 3外的左屏蔽 电极 5、左屏蔽环 7,安装在右检测电极 4外的右屏蔽电极 6、右屏蔽环 8。 其中， 所述的上磁铁 1、 下磁铁 2均为永久磁铁， 提供恒定的磁场。
如图 2所示，本发明中的左检测电极 3、右检测电极 4均为椭圆形状， 根据平行板电容器公式 C = s^ , 电容 C与电容极板的面积成正比、 距离成 d
反比。 由图 4所示， 两对电极以中心对称， 上部距离逐渐减小， 故设计电 极时， 将所对称的面积也减小， 根据相切圆的原理， 左右检测电极设计为 椭圆形状，尽量保证两个检测电极之间电容的恒定， 以保证电场的均匀性。
上磁铁 1、 下磁铁 2提供磁场， 当流体在测量管中流动时， 流体切割 磁力线产生感应电动势， 其大小同流体的平均流速成正比。 安装在测量管 外壁的左检测电极 3、 右检测电极 4与上磁铁 1、 下磁铁 2正交， 左检测 电极 3与右检测电极 4形成以流体及测量管管壁作为介质的电容， 通过检 测左右两个检测电极之间电容的变化， 可以得到与流体平均流速相关的信 号， 从而实现流体的流量测量。
通过上述实施例， 能够达到如下的优点和积极效果：
( 1 ) 本发明采用永久磁铁提供恒定的磁场， 不需要激励电路， 结构 筒单， 功耗低， 适合于两线制供电应用需求场合；
( 2 ) 本发明采用椭圆形状的检测电极， 尽量保证检测电极之间电容 的恒定， 进而保证电场的均匀性， 降低了非线性， 减小了粒状噪声的干扰， 提高了抗干扰能力， 可广泛应用于各种液固二相流体， 如泥浆、 纸浆等的 流量测量。
以上所述的具体实施方式， 对本发明的目的、 技术方案和有益效果进行 了进一步详细说明， 所应理解的是， 以上所述仅为本发明的具体实施方式而 已， 并不用于限定本发明的保护范围， 凡在本发明的精神和原则之内， 所做 的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1、 一种流量计， 其特征在于， 包括： 设置在测量管外壁上、 下两侧的上磁铁 （1 ) 、 下磁铁（2) ； 安装在测量管外壁左、 右两侧的左检测电极（3)、 右检测电极（4) , 所述左检测电极（3) 和所述右检测电极 （4) 均与信号处理电路连接； 所述左检测电极（3) 外设置有左屏蔽电极 （5) 和左屏蔽环 （7) , 所述右检测电极（4) 外设置有右屏蔽电极（6) 、 右屏蔽环 （8) ； 所述左检测电极（ 3 ) 、 右检测电极（ 4 ) 均为椭圆形状， 用以形成恒 定的电容。
2、 如权利要求 1所述的流量计， 其特征在于， 所述上磁铁（ 1 ) 、 下 磁铁 ( 2 ) 均为永久磁铁， 用以提供恒定的磁场。
PCT/CN2013/090205 2013-02-22 2013-12-23 一种流量计 WO2014127670A1 (zh)

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CN103196503B (zh) * 2013-02-22 2015-03-25 孙晓君 一种流量计
CN111307230A (zh) * 2020-03-02 2020-06-19 西门子传感器与通讯有限公司 电磁流量计
CN112229457B (zh) * 2020-11-19 2021-09-21 吉林大学 一种新型电磁流量计及其测量方法

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