JP3113946B2 - Vortex flow meter - Google Patents
Vortex flow meterInfo
- Publication number
- JP3113946B2 JP3113946B2 JP03354916A JP35491691A JP3113946B2 JP 3113946 B2 JP3113946 B2 JP 3113946B2 JP 03354916 A JP03354916 A JP 03354916A JP 35491691 A JP35491691 A JP 35491691A JP 3113946 B2 JP3113946 B2 JP 3113946B2
- Authority
- JP
- Japan
- Prior art keywords
- vortex
- pair
- electrodes
- magnetic field
- fluid
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Landscapes
- Measuring Volume Flow (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、渦流量計に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vortex flowmeter.
【０００２】[0002]
【従来の技術】一般に、渦流量計は、管路中に設けた渦
発生体の下流側に発生するカルマン渦の発生周期が流速
に比例するという関係があることに基づき、このカルマ
ン渦の発生周期を検出して流体の流速、ひいては流量を
計測するようにしている。このような渦流量計の一例と
して特公昭60-14290号公報に示すものがある。この渦流
量計は、カルマン渦の生成に伴い渦発生体に作用する交
番力を検出し、この交番力に基づいて渦発生周波数、ひ
いては流体の流量を測定するようにしている。2. Description of the Related Art Generally, a vortex flowmeter is based on the fact that the generation cycle of Karman vortices generated downstream of a vortex generator provided in a pipe is proportional to the flow velocity. The cycle is detected to measure the flow velocity of the fluid, and thus the flow rate. An example of such a vortex flowmeter is disclosed in Japanese Patent Publication No. 60-14290. The vortex flowmeter detects an alternating force acting on the vortex generator in accordance with the generation of the Karman vortex, and measures the vortex generation frequency, and thus the fluid flow rate, based on the alternating force.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上述した渦
流量計は、流体の流れ等に伴って渦発生体に作用する力
を利用して流体の流量を測定しており、例えば管路が振
動した際にもこの振動の影響を受けることとなり、耐振
性が低いものであった。The above-mentioned vortex flowmeter measures the flow rate of the fluid by using the force acting on the vortex generator with the flow of the fluid. In this case, the vibration is also affected, and the vibration resistance is low.
【０００４】また、前記流体の流れ等に伴って渦発生体
に作用する力Ｐは、流体の密度ρを、流速をＶとする
と、ρＶ2 に比例するので、この力Ｐに対する検出手段
（センサ）のダイナミックレンジとしては流速の２乗の
値分に対応した範囲のものが要求され、このダイナミッ
クレンジの広範囲にわたって安定して検出手段を動作さ
せることは容易なものではなく、例えば低流速域の感度
が犠牲にされてしまうという問題点があった。The force P acting on the vortex generator with the flow of the fluid is proportional to ρV 2 , where V is the density of the fluid and V is the flow velocity. The dynamic range of (2) is required to be in a range corresponding to the square of the flow velocity. It is not easy to operate the detecting means stably over a wide range of the dynamic range. There is a problem that the sensitivity is sacrificed.
【０００５】本発明は、上記事情に鑑みてなされたもの
で、管路振動の影響を受けることなく適正に流量を計測
でき、かつ低流速域までの流量計測を感度高く達成でき
る渦流量計を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a vortex flowmeter capable of appropriately measuring a flow rate without being affected by pipeline vibration and achieving high-sensitivity flow measurement up to a low flow velocity region. The purpose is to provide.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記目的を達
成するために、導電性流体が流れる管路と、 該管路内に
設けた渦発生体と、 前記管路内の前記渦発生体の下流側
に設けられた支持体と、前記渦発生体と前記支持体との
間に、前記導電性流体の流れ方向と直交する磁界を形成
させる磁界発生手段と、前記渦発生体における下流側部
分及び前記支持体に相対向して設けられた一対の電極
と、からなることを特徴とする。Means for Solving the Problems The present invention, in order to achieve the above object, a conduit for conducting fluid flows, the tube passage
The provided vortex generator and a downstream side of the vortex generator in the conduit
A support provided in the vortex generator and the support
Forming a magnetic field perpendicular to the flow direction of the conductive fluid
Magnetic field generating means for causing the vortex generator to have a downstream side
And a pair of electrodes provided opposite to each other on the support
And characterized by the following.
【０００７】[0007]
【作用】このような構成とすれば、渦発生体の下流側
に、交互に向きが変わり、かつ磁界の方向及び一対の電
極の配置方向のいずれにも直交する方向の成分を含むカ
ルマン渦を発生するので、一対の電極の配置方向の起電
力が発生して一対の電極に印加されるとともに、カルマ
ン渦の向きが交互に切り替わることにより前記一対の電
極に印加される起電力もカルマン渦の発生周期に対応し
て交番的に変化するものとなる。[Action] With such a structure, mosquitoes comprising downstream of the vortex generator, alternately in the direction is changed, and the direction component perpendicular to both the arrangement direction of the magnetic field direction and the pair of electrodes
Since generating a mans vortex, while being applied to the pair of electrodes electromotive force of the arrangement direction of the pair of electrodes is generated, Karma
When the direction of the vortex is alternately switched, the electromotive force applied to the pair of electrodes also changes alternately according to the generation cycle of the Karman vortex .
【０００８】[0008]
【実施例】以下、本発明の一実施例の渦流量計を図１及
び図２に基づいて説明する。図において、１は導電性流
体を図中Ｘ方向に流す非磁性体の管路であり、管路１の
側部には、一対の永久磁石2a，2b（磁界発生手段）が設
けられている。一対の永久磁石2a，2bは、Ｎ極Ｓ極がそ
れぞれ相対向するようにして配置されており、このよう
に一対の永久磁石2a，2bを配置することにより、管路１
内に図中Ｚ方向の磁界が形成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vortex flowmeter according to an embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 1 denotes a non-magnetic pipe for flowing a conductive fluid in the X direction in the figure, and a pair of permanent magnets 2a and 2b (magnetic field generating means) are provided on the side of the pipe 1. . The pair of permanent magnets 2a and 2b are arranged such that the N pole and the S pole face each other. By arranging the pair of permanent magnets 2a and 2b in this manner, the pipeline 1
Inside, a magnetic field in the Z direction in the figure is formed.
【０００９】管路１内には、下流側（図においてＸ方
向）部分にカルマン渦３を発生させる渦発生体４が後述
するようにして設けられている。管路１内の、渦発生体
４の下流側部分には、支持体５が設けられており、渦発
生体４の下流側部分及び支持体５にはＸ方向に相対向す
るようにして、すなわち磁界に直交して一対の電極6a，
6bが設けられている。前記渦発生体４は、前記一対の電
極6a，6b間にカルマン渦３が位置するようにして設けら
れている。A vortex generator 4 for generating a Karman vortex 3 is provided in the pipeline 1 at a downstream side (X direction in the figure) as described later. A support 5 is provided at a downstream portion of the vortex generator 4 in the pipeline 1, and the downstream portion of the vortex generator 4 and the support 5 are opposed to each other in the X direction. That is, a pair of electrodes 6a,
6b is provided. The vortex generator 4 is provided such that the Karman vortex 3 is located between the pair of electrodes 6a and 6b.
【００１０】この場合、前記カルマン渦３は、渦発生体
４に対して時計方向及び反時計方向に交互に切り替わる
ように発生し、磁界の方向（Ｚ方向）及び一対の電極6
a，6bの配置方向（Ｘ方向）のいずれにも直交するＹ方
向成分を含んでいる。このようにカルマン渦３がＹ方向
成分を含むことで、ファラデーの法則によりＸ方向の起
電力が発生して一対の電極6a，6b間に電位差が生じるこ
とになる。同時に、カルマン渦３は、渦発生体４に対し
て時計方向及び反時計方向に交互に切り替わって発生す
るので、一対の電極6a，6b間に生じる起電力もカルマン
渦３の発生周期に対応して交番的に変化するものとな
る。In this case, the Karman vortex 3 is generated so as to be alternately switched clockwise and counterclockwise with respect to the vortex generator 4, and the direction of the magnetic field (Z direction) and the pair of electrodes 6.
Both the arrangement directions (X direction) of a and 6b include a Y direction component orthogonal to the arrangement direction. Since the Karman vortex 3 contains the Y-direction component, an electromotive force in the X-direction is generated by Faraday's law, and a potential difference is generated between the pair of electrodes 6a and 6b. At the same time, the Karman vortex 3 is generated by being alternately switched clockwise and counterclockwise with respect to the vortex generator 4, so that the electromotive force generated between the pair of electrodes 6 a and 6 b also corresponds to the generation cycle of the Karman vortex 3. And change alternately.
【００１１】一対の電極6a，6bは流量計測回路７に接続
されている。この流量計測回路７は、一対の電極6a，6b
間に生じた起電力の交番数を求めてカルマン渦３の発生
周期を得てカルマン渦３の発生周期に比例する流体の流
速ひいては流体の流量を得るようになっている。The pair of electrodes 6a and 6b are connected to a flow rate measuring circuit 7. The flow measurement circuit 7 includes a pair of electrodes 6a, 6b
The generation cycle of the Karman vortex 3 is obtained by obtaining the number of alternations of the electromotive force generated in between, and the flow velocity of the fluid and the flow rate of the fluid in proportion to the generation cycle of the Karman vortex 3 are obtained.
【００１２】以上のように構成された渦流量計では、管
路１を導電性流体が流れると、渦発生体４によりカルマ
ン渦３が発生し、このカルマン渦３が磁界の方向（Ｚ方
向）及び一対の電極6a，6bの配置方向（Ｘ方向）いずれ
にも直交する方向（Ｙ方向）成分を含み、かつこのカル
マン渦３が渦発生体４に対して時計方向及び反時計方向
に交互に切り替わって発生することにより、カルマン渦
３の発生周期に対応して交番的に変化する起電力が発生
してこの起電力が一対の電極6a，6bにより検出される。In the vortex flowmeter configured as described above, when a conductive fluid flows through the conduit 1, a Karman vortex 3 is generated by the vortex generator 4, and the Karman vortex 3 is directed in the direction of the magnetic field (Z direction). And the direction (Y direction) orthogonal to both the arrangement direction (X direction) of the pair of electrodes 6a and 6b, and this Karman vortex 3 alternates clockwise and counterclockwise with respect to the vortex generator 4. By the occurrence of the switching, an electromotive force that alternately changes according to the generation cycle of the Karman vortex 3 is generated, and the electromotive force is detected by the pair of electrodes 6a and 6b.
【００１３】この後、流量計測回路７が、一対の電極6
a，6b間に生じる前記起電力の交番数に基づいて流体の
流量を求める。Thereafter, the flow rate measuring circuit 7 is operated by the pair of electrodes 6.
The flow rate of the fluid is determined based on the number of alternations of the electromotive force generated between a and 6b.
【００１４】このように磁界を鎖交するように導電性流
体のカルマン渦３を発生させることによりカルマン渦３
の発生周波数に対応して交番的に変化する起電力を得て
流体の流量を得ているので、管路１の振動等の外乱に影
響されなくて済むこととなって精度高い流量計測を行な
うことができる。By generating the Karman vortex 3 of the conductive fluid so as to link the magnetic field, the Karman vortex 3 is generated.
Since the flow rate of the fluid is obtained by obtaining an electromotive force that changes alternately in accordance with the frequency of occurrence of, the flow rate measurement can be performed with high accuracy without being affected by disturbance such as vibration of the pipeline 1. be able to.
【００１５】さらに、前記のようにして発生する起電力
は、カルマン渦３のＹ方向〔磁界の方向（Ｚ方向）及び
一対の電極6a，6bの配置方向（Ｘ方向）いずれにも直交
する方向〕成分、ひいては流体の流速に比例した量であ
り、このため低流速域から高流速域の範囲にわたって常
に感度よくかつ安定して流量計測できることになる。Further, the electromotive force generated as described above is applied to the Karman vortex 3 in the Y direction [magnetic field direction (Z direction) and
Orthogonal to the arrangement direction (X direction) of the pair of electrodes 6a and 6b
Direction) , and therefore the amount is proportional to the flow velocity of the fluid. Therefore, the flow rate can always be measured with high sensitivity and stability over a range from a low flow velocity range to a high flow velocity range.
【００１６】なお、本実施例では、永久磁石2a，2b（磁
界発生手段）を用いて磁界を形成する場合を例にした
が、本発明はこれに限定されるものではなく、例えばソ
レノイド等（磁界発生手段）を用いて磁界を形成するよ
うにしてもよい。In this embodiment, the permanent magnets 2a and 2b (magnetic
Although the case where the magnetic field is formed using the field generating means) is described as an example, the present invention is not limited to this. For example, the magnetic field may be formed using a solenoid or the like (magnetic field generating means). .
【００１７】[0017]
【発明の効果】本発明は、以上説明したように構成され
た渦流量計であるから、管路に導電性流体が流されるこ
とにより、一対の電極間に、カルマン渦の発生周期に対
応して交番的に変化する起電力が生じるので、この起電
力の交番数を求めることにより、カルマン渦の発生周期
を得られ、さらに流体の流速ひいては流量を計測できる
ことになる。このように磁界を鎖交するように導電性流
体のカルマン渦を発生させてカルマン渦の発生周波数に
対応して交番的に変化する起電力に基づいて流体の流量
計測を図れるので、管路が振動等の外乱に影響されなく
て済むこととなって精度高い流量計測を行なうことがで
きる。Since the present invention is a vortex flowmeter constructed as described above, a conductive fluid is caused to flow through a conduit to correspond to the generation cycle of Karman vortices between a pair of electrodes. Since an electromotive force that changes alternately occurs, the generation period of the Karman vortex can be obtained by determining the number of alternations of the electromotive force, and the flow velocity of the fluid and thus the flow rate can be measured. In this way, the Karman vortex of the conductive fluid is generated so as to interlink the magnetic field, and the flow rate of the fluid can be measured based on the electromotive force that changes alternately according to the frequency of the Karman vortex. Since it is not necessary to be affected by disturbance such as vibration, accurate flow rate measurement can be performed.
【００１８】さらに、一対の電極間に生じる起電力は、
カルマン渦における磁界の方向及び一対の電極の配置方
向のいずれにも直交する方向成分、ひいては流体の流速
に比例した量であり、このため低流速域から高流速域の
範囲にわたって常に感度よくかつ安定して流量計測でき
ることになる。 Further, the electromotive force generated between the pair of electrodes is:
Direction of magnetic field and arrangement of a pair of electrodes in Karman vortex
It is a direction component that is orthogonal to any of the directions, and is an amount proportional to the flow velocity of the fluid. Therefore, the flow rate can always be measured with high sensitivity over a range from a low flow velocity range to a high flow velocity range.
【図１】本発明の一実施例の渦流量計を示す横断面図で
ある。FIG. 1 is a cross-sectional view showing a vortex flowmeter according to one embodiment of the present invention.
【図２】図１のＡ−Ａ線矢視図である。FIG. 2 is a view taken along the line AA of FIG. 1;
１ 管路 2a 永久磁石 2b 永久磁石 ３ カルマン渦 ４ 渦発生体 6a 電極 6b 電極 DESCRIPTION OF SYMBOLS 1 Pipeline 2a Permanent magnet 2b Permanent magnet 3 Karman vortex 4 Vortex generator 6a Electrode 6b Electrode
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭49−78573（ＪＰ，Ａ) 特公 昭53−33870（ＪＰ，Ｂ２) 特公 昭53−33871（ＪＰ，Ｂ２) 特公 昭52−16375（ＪＰ，Ｂ２) 特公 昭53−5552（ＪＰ，Ｂ２) 実公 昭52−46118（ＪＰ，Ｙ２) (58)調査した分野(Int.Cl.7，ＤＢ名) G01F 1/32 G01F 1/58 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-49-78573 (JP, A) JP-B-53-33870 (JP, B2) JP-B-53-33871 (JP, B2) JP-B-52 16375 (JP, B2) JP-B-53-5552 (JP, B2) JP-B-52-46118 (JP, Y2) (58) Fields investigated (Int. Cl. 7 , DB name) G01F 1/32 G01F 1 / 58
Claims (1)
と、 前記渦発生体と前記支持体との間に、前記導電性流体の
流れ方向と直交する磁界を形成させる磁界発生手段と、 前記渦発生体における下流側部分及び前記支持体に相対
向して設けられた一対の電極と、からなる ことを特徴と
する渦流量計。1. A conduit through which a conductive fluid flows , a vortex generator provided in the conduit, and a support provided downstream of the vortex generator in the conduit.
And, between the vortex generator and the support, the conductive fluid
A magnetic field generating means for forming a magnetic field perpendicular to the flow direction ;
And a pair of electrodes provided facing each other .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03354916A JP3113946B2 (en) | 1991-12-20 | 1991-12-20 | Vortex flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03354916A JP3113946B2 (en) | 1991-12-20 | 1991-12-20 | Vortex flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05172598A JPH05172598A (en) | 1993-07-09 |
| JP3113946B2 true JP3113946B2 (en) | 2000-12-04 |
Family
ID=18440774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03354916A Expired - Fee Related JP3113946B2 (en) | 1991-12-20 | 1991-12-20 | Vortex flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3113946B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109931990A (en) * | 2019-02-25 | 2019-06-25 | 吉林大学 | Based on the adjustable bionical flow sensor of legendary venomous insect trichopore sensitivity and flow detector |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6435036B1 (en) | 2000-07-17 | 2002-08-20 | Matsushita Electric Industrial Co., Ltd. | Vortex flow meter |
| CN103913197B (en) * | 2014-03-19 | 2016-09-14 | 哈尔滨工程大学 | A kind of odd-shaped cross section magnetic vortex street flowmeter with bionical characteristic |
| CN105021234B (en) * | 2015-08-11 | 2018-12-07 | 哈尔滨工程大学 | A kind of biomimetic type magnetic vortex street flowmeter for reinforcing ability with vortex street |
| KR102098828B1 (en) * | 2019-02-20 | 2020-04-08 | 신동아전자(주) | Fluidic oscillation flowmeter |
-
1991
- 1991-12-20 JP JP03354916A patent/JP3113946B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109931990A (en) * | 2019-02-25 | 2019-06-25 | 吉林大学 | Based on the adjustable bionical flow sensor of legendary venomous insect trichopore sensitivity and flow detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05172598A (en) | 1993-07-09 |
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