CN103196503B - 一种流量计 - Google Patents

一种流量计 Download PDF

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Publication number
CN103196503B
CN103196503B CN201310056415.6A CN201310056415A CN103196503B CN 103196503 B CN103196503 B CN 103196503B CN 201310056415 A CN201310056415 A CN 201310056415A CN 103196503 B CN103196503 B CN 103196503B
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detecting electrode
electrode
fluid
magnet
measuring tube
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CN103196503A (zh
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孙晓君
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Micromeasurement Industrial Control Equipment (Langfang) Co.,Ltd.
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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

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

Abstract

本发明涉及一种流量计，所述流量计包括：安装在测量管外壁上、下两侧的上磁铁、下磁铁，安装在测量管外壁左、右两侧的左检测电极、右检测电极，与左检测电极和右检测电极相连接的信号处理电路，安装在左检测电极外的左屏蔽电极、左屏蔽环，安装在右检测电极外的右屏蔽电极、右屏蔽环。本发明实施例提供的流量计功耗低，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简单，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，结构简单，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电容C与电容极板的面积成正比、距离成反比。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，结构简单，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 (1)

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)以中心对称，上部距离逐渐减小，所对称的面积也减小，左检测电极和右检测电极均为椭圆形状，用以形成两个电极之间恒定的电容，以保证电场的均匀性；
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，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，通过检测左检测电极和右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。
CN201310056415.6A 2013-02-22 2013-02-22 一种流量计 Active CN103196503B (zh)

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CN201310056415.6A CN103196503B (zh) 2013-02-22 2013-02-22 一种流量计
PCT/CN2013/090205 WO2014127670A1 (zh) 2013-02-22 2013-12-23 一种流量计
CA2843049A CA2843049A1 (en) 2013-02-22 2014-02-17 A flowmeter having a magnet and detection electrode arrangement with constant capacitance between detection electrodes

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Publication number Priority date Publication date Assignee Title
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
CN111982215A (zh) * 2020-08-31 2020-11-24 维沃移动通信有限公司 流量检测装置和检测方法
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388834A (en) * 1981-03-31 1983-06-21 Fischer & Porter Company Electromagnetic flowmeter having a monolithic conduit
US5421210A (en) * 1993-01-29 1995-06-06 Yokogawa Electric Corporation Capacitance type electromagnetic flowmeter
CN101162163A (zh) * 2007-11-20 2008-04-16 浙江大学 电容式电磁流量计
CN101900583A (zh) * 2008-11-26 2010-12-01 克洛纳有限公司 磁感应流量测量设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000352530A (ja) * 1999-06-10 2000-12-19 Aichi Tokei Denki Co Ltd 電磁波流量計
CN1560569A (zh) * 2004-02-18 2005-01-05 沈阳市传感技术研究所 永磁小口径流量计
CN103196503B (zh) * 2013-02-22 2015-03-25 孙晓君 一种流量计

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388834A (en) * 1981-03-31 1983-06-21 Fischer & Porter Company Electromagnetic flowmeter having a monolithic conduit
US5421210A (en) * 1993-01-29 1995-06-06 Yokogawa Electric Corporation Capacitance type electromagnetic flowmeter
CN101162163A (zh) * 2007-11-20 2008-04-16 浙江大学 电容式电磁流量计
CN101900583A (zh) * 2008-11-26 2010-12-01 克洛纳有限公司 磁感应流量测量设备

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CA2843049A1 (en) 2014-08-22
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