JPS59198317A - Electromagnetic measurement of vortex flow meter - Google Patents
Electromagnetic measurement of vortex flow meterInfo
- Publication number
- JPS59198317A JPS59198317A JP58074249A JP7424983A JPS59198317A JP S59198317 A JPS59198317 A JP S59198317A JP 58074249 A JP58074249 A JP 58074249A JP 7424983 A JP7424983 A JP 7424983A JP S59198317 A JPS59198317 A JP S59198317A
- Authority
- JP
- Japan
- Prior art keywords
- vortex
- flow
- flow rate
- frequency
- measuring
- 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.)
- Pending
Links
Classifications
-
- 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
-
- 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
- G01F1/05—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 mechanical effects
- G01F1/20—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 mechanical effects by detection of dynamic effects of the flow
- G01F1/32—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 mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
- G01F1/3209—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 mechanical effects by detection of dynamic effects of the flow using swirl flowmeters using Karman vortices
-
- 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
- G01F1/05—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 mechanical effects
- G01F1/20—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 mechanical effects by detection of dynamic effects of the flow
- G01F1/32—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 mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
- G01F1/325—Means for detecting quantities used as proxy variables for swirl
Abstract
Description
【発明の詳細な説明】
本発明は渦を利用した流速、及び流量測定方法に関する
ものであり、さらに詳しくは、電磁流量計と同一の原理
を利用して、渦の放出に供なう流量変動の検出から渦周
波数を測定する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring flow velocity and flow rate using vortices, and more specifically, the present invention relates to a method for measuring flow velocity and flow rate using vortices. The present invention relates to a method for measuring eddy frequency from the detection of .
従来の渦流量計では渦放出に供なう流速や圧力などの変
動を検出して渦周波数を測定するため、流れの乱れの影
響を受は易いという問題がある。また、従来の電磁流量
計では流量に比例して現われる電極間の微弱な電位差の
絶対値を正確に測定する必要があるため、電気ノイズや
信号のドリフトの影響が問題となる。Conventional vortex flowmeters measure vortex frequency by detecting fluctuations in flow velocity and pressure associated with vortex shedding, so there is a problem in that they are easily affected by flow turbulence. Furthermore, because conventional electromagnetic flowmeters need to accurately measure the absolute value of the weak potential difference between electrodes that appears in proportion to the flow rate, the effects of electrical noise and signal drift pose problems.
本発明は、渦流量計、及び電磁流量計の長所を取り合わ
せることにより、上記問題点を解決することを目的とし
ている。The present invention aims to solve the above problems by combining the advantages of a vortex flowmeter and an electromagnetic flowmeter.
電磁流量計は従来の渦流量計に比較して流れに乱れがあ
る場合でもより安定に測定することができる。これは渦
流量計では渦放出が引き起こすある点、又はある直線上
の流速、圧力、抗力などの変動を検出しているのに刻し
て、電磁流量計では流れが通過する断面全体の流速を積
分した流量に比例する電位差を検出しているため、流れ
の乱れの影響が小さくなるからである。Compared to conventional vortex flowmeters, electromagnetic flowmeters can provide more stable measurements even when there is turbulence in the flow. This is because a vortex flowmeter detects fluctuations in flow velocity, pressure, drag, etc. at a certain point or on a straight line caused by vortex shedding, whereas an electromagnetic flowmeter detects the flow velocity over the entire cross section through which the flow passes. This is because a potential difference proportional to the integrated flow rate is detected, so the influence of flow disturbance is reduced.
したかって、この電磁流量計と同一の原理を利用すれば
、渦流量計の渦放出が引き起こす渦発生体近傍の流量の
変動をより安定に検出することができる。さらに、従来
の電磁流量計にそのまま渦発生体を取り付けるだけでも
、その出力電位差の変動周波数を測定すれば流量を求め
ることができるため、電磁流量計の弱点である電気ノイ
ズやドリフトの影響をさけることができる。もちろん、
必要なときは、変動する電位差の平均をとることによっ
て、電磁流量計としても使うことができる。Therefore, by using the same principle as this electromagnetic flowmeter, it is possible to more stably detect fluctuations in the flow rate near the vortex generator caused by the vortex shedding of the vortex flowmeter. Furthermore, by simply attaching a vortex generator to a conventional electromagnetic flowmeter, the flow rate can be determined by measuring the fluctuation frequency of the output potential difference, thereby avoiding the effects of electrical noise and drift, which are weaknesses of electromagnetic flowmeters. be able to. of course,
When necessary, it can also be used as an electromagnetic flowmeter by averaging the fluctuating potential differences.
以下１図面等を参照して本発明をさらに詳しく説明する
。第１図（イ）、仲）は電磁式渦流量計の実施例を示す
概略図である。内面を絶縁したパイプライン１の外側か
ら電磁コイル２でパイプラインの中を流れる流れに対し
て垂直に磁界を４荷い さらにパイプライン内に絶縁し
た渦発生体３を取り付ける。パイプラインｅ旧こ電極４
゜７を、渦発生体に電極５，６を取り付ける。The present invention will be described in more detail below with reference to one drawing and the like. FIG. 1(a) and middle) are schematic diagrams showing an embodiment of an electromagnetic vortex flowmeter. A magnetic field is applied from the outside of a pipeline 1 whose inner surface is insulated by an electromagnetic coil 2 perpendicular to the flow flowing through the pipeline, and an insulated vortex generator 3 is installed inside the pipeline. pipeline e old electrode 4
7, attach electrodes 5 and 6 to the vortex generator.
特開昭５６−２２９６３． リング渦を利用した流速
法形状のリングについてはその後方に渦輪列か放出され
る。図２はこれを模式的に表わした図である。このよう
な渦が放出されるとき、リングの内側やその後方では流
速が大きく変動する。Japanese Patent Publication No. 56-22963. For a ring with a velocity method shape that uses a ring vortex, a vortex train is released behind it. FIG. 2 is a diagram schematically representing this. When such a vortex is released, the flow velocity fluctuates greatly inside the ring and behind it.
この変動する周波数を測定することによってパイプライ
ン内を通過する流速・流量が求まるのであるが、先にも
述べた理由によって、流量の変動の方がより安定に検出
できるため１図１に示すリング状渦発生体３の内側を通
過する流量の変動を測定する。具体的には電極５，６間
に生ずる電位差と電極４，７間に生ずる電位差の差を測
定し、その差の変動周波数を求める。ここで、この２対
の電極間の差を測定するのは外乱の影響を小さくするた
めであって、もちろん電極５，６間の電位差の変動周波
数の測定からだけでも流量は求められる。By measuring this fluctuating frequency, the flow velocity and flow rate passing through the pipeline can be determined, but for the reasons mentioned above, fluctuations in flow rate can be detected more stably. Fluctuations in the flow rate passing inside the vortex generator 3 are measured. Specifically, the difference between the potential difference occurring between electrodes 5 and 6 and the potential difference occurring between electrodes 4 and 7 is measured, and the fluctuation frequency of the difference is determined. Here, the reason for measuring the difference between these two pairs of electrodes is to reduce the influence of disturbances, and of course, the flow rate can also be determined just by measuring the frequency of fluctuation of the potential difference between the electrodes 5 and 6.
この他、渦発生体には図３（イ）（ロ）に示すように２
本の柱状物体９を用いてもよい。このときも２本の渦発
生体の間やその後方では大きく流速が変動する。また９
図４（イ）（ロ）に示すようζこ渦発生体は流量変動検
出用電極１０．１１の上流側に取り付けることも考えら
れるし、取りはずし可能の構造として通常は磁流置針と
して使用し、流体の電気型導度が悪い場合、電気ノイズ
′やドリフトの影響が大きい場合、電磁流量計自身の校
正の場合などのみ渦流量計として使用することも可能で
ある。In addition, there are two vortex generators as shown in Figure 3 (a) and (b).
A columnar object 9 of a book may also be used. At this time as well, the flow velocity varies greatly between and behind the two vortex generators. Also 9
As shown in FIGS. 4(a) and 4(b), the ζ vortex generator may be attached upstream of the flow rate fluctuation detection electrode 10.11, or it may have a removable structure and is usually used as a magnetic current pointer. It is also possible to use it as a vortex flowmeter only when the electrical conductivity of the fluid is poor, when the influence of electrical noise' or drift is large, or when calibrating the electromagnetic flowmeter itself.
図１ 本発明の実施例を示す概略図（イ）正面図。
（ｏ）断面図
図２ リング状渦発生体からの渦放出を示す模式図
図３ 本発明の実施例を示す概略図（イ）正面図。
（ロ）断面図
図４ 本発明の実施例を示す概略図（イ）正面図。
（ロ）断面図
１ ・ ・・・ 内面を絶縁した。ａイブライン２
・・・・・・・・ 磁界を発゛生させるためのコイ
ル３ ・・・ ・・・・・・ 絶縁されたリンク状の渦
発生体４、５．６．７・・・・電極
８・・・・・・・・・・・・・・ リング状渦発生体力
）ら放出される渦
９ −・・ ２本の柱状渦発生体１０’、 １１
・ ・ 渦発生体の下流側−配置した電極指定代理人
昭２
ε！二二二 ε至二二FIG. 1 is a schematic diagram (A) front view showing an embodiment of the present invention. (o) Cross-sectional view Figure 2 Schematic diagram showing vortex shedding from a ring-shaped vortex generator Figure 3 Schematic diagram showing an embodiment of the present invention (A) Front view. (B) Cross-sectional view Figure 4 Schematic diagram showing an embodiment of the present invention (A) Front view. (b) Cross-sectional view 1 ・・Inner surface is insulated. a Eve line 2
...... Coil 3 for generating a magnetic field ... ... Insulated link-shaped vortex generator 4, 5.6.7... Electrode 8.・・・・・・・・・・・・ Vortex 9 emitted from the ring-shaped vortex generator 9 -... Two columnar vortex generators 10', 11
・ ・ Downstream side of the vortex generator - Designated electrode designated representative Sho2 ε! 222 ε to 22
Claims (1)
の周波数から、その流体の流速、又は流量を測定するに
際して、流れに対して垂直の方向に磁界を加えたとき、
流れと磁界の両者に対して垂直な方向に流量に比例した
電位差が現われる原理に基づき、渦の放出に供なう渦発
生体近傍の流量変動を検出し、渦周波数を求めることを
特徴とする電磁式渦流量計の測定方法When measuring the flow velocity or flow rate of the fluid from the frequency of the vortices emitted behind a vortex generator placed in the flow, when a magnetic field is applied in the direction perpendicular to the flow,
Based on the principle that a potential difference proportional to the flow rate appears in a direction perpendicular to both the flow and the magnetic field, it detects the flow rate fluctuation near the vortex generator that causes vortex shedding, and determines the vortex frequency. Measuring method using electromagnetic vortex flowmeter
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58074249A JPS59198317A (en) | 1983-04-27 | 1983-04-27 | Electromagnetic measurement of vortex flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58074249A JPS59198317A (en) | 1983-04-27 | 1983-04-27 | Electromagnetic measurement of vortex flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59198317A true JPS59198317A (en) | 1984-11-10 |
Family
ID=13541694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58074249A Pending JPS59198317A (en) | 1983-04-27 | 1983-04-27 | Electromagnetic measurement of vortex flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59198317A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5063786A (en) * | 1989-02-01 | 1991-11-12 | Severn Trent Water Limited | Fluid flow meters |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS535552A (en) * | 1976-07-02 | 1978-01-19 | Sumitomo Electric Ind Ltd | Antenna on vehicle |
-
1983
- 1983-04-27 JP JP58074249A patent/JPS59198317A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS535552A (en) * | 1976-07-02 | 1978-01-19 | Sumitomo Electric Ind Ltd | Antenna on vehicle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5063786A (en) * | 1989-02-01 | 1991-11-12 | Severn Trent Water Limited | Fluid flow meters |
| WO1992002785A1 (en) * | 1989-02-01 | 1992-02-20 | Severn Trent Water Limited | Fluid flow meters |
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