JPS6022728B2 - vortex flow meter - Google Patents
vortex flow meterInfo
- Publication number
- JPS6022728B2 JPS6022728B2 JP54083108A JP8310879A JPS6022728B2 JP S6022728 B2 JPS6022728 B2 JP S6022728B2 JP 54083108 A JP54083108 A JP 54083108A JP 8310879 A JP8310879 A JP 8310879A JP S6022728 B2 JPS6022728 B2 JP S6022728B2
- Authority
- JP
- Japan
- Prior art keywords
- vortex
- fluid
- electrode
- frequency
- electrodes
- 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
Links
Description
【発明の詳細な説明】
この発明は渦流量計に関し、特に流体の流速検出部に電
力等の供給を行なうことなく流速検知信号を得ることが
できる渦流量計を提供するにある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vortex flowmeter, and particularly to a vortex flowmeter that can obtain a flow velocity detection signal without supplying power or the like to a fluid flow velocity detection section.
従釆より例えば電磁流量計或いは渦流量計等が実用され
ている。For example, electromagnetic flowmeters or vortex flowmeters are in practical use.
従来これら流量計では何れも検出部において電力消費を
伴なう。即ち例えば電磁流量計では磁界を形成するため
に励磁電力を必要とする。また渦流量計ではストレンゲ
ージ或いはサーミスタ等により渦発生体によって発生し
た渦の通過周期を検出し、その渦の通過周期から流体の
流速を求め流量を知るものであるが、サーミスタ或いは
ストレンゲージ等には所定の電力を供給しなければなら
ない。何れにしても検出部に電力の供給を必要とし、検
出部の形状が大きくなる欠点がある。更に検出部におけ
る電力消費も比較的大きい。従って2線式伝送器等の構
成を採り難い。更に検出部において電力を消費するため
本質安全防嬢構造とすることが難かしい等の種々の不都
合がある。この発明の目的は検出部においては電力消費
が全くなく、従って検出部の形状を4・型化でき、本質
安全防嬢構造とすることも容易な渦流量計を提供するに
ある。All of these conventional flow meters involve power consumption in the detection section. That is, for example, an electromagnetic flowmeter requires excitation power to form a magnetic field. In addition, a vortex flowmeter uses a strain gauge or thermistor to detect the passage period of a vortex generated by a vortex generator, and determines the flow rate of the fluid from the passage period of the vortex. must supply a specified amount of power. In any case, there is a drawback that power needs to be supplied to the detection section and the shape of the detection section becomes large. Furthermore, the power consumption in the detection section is also relatively large. Therefore, it is difficult to adopt a configuration such as a two-wire transmitter. Furthermore, there are various disadvantages such as the fact that it is difficult to provide an intrinsically safe structure because the detection section consumes power. An object of the present invention is to provide a vortex flowmeter in which the detecting section consumes no power at all, and therefore the detecting section can be made into a four-shape type, and can easily be made into an intrinsically safe structure.
0 この発明では流体に接する一対の電極を設け、この
電極間に発生する電気化学的作用により発生する電圧を
渦発生体によって発生した渦によって変化させ、その電
圧変化の周期を検出して単位時間当りの渦の発生個数を
検出し、流体の流量を計づ側するようにしたものである
。0 In this invention, a pair of electrodes in contact with the fluid is provided, and the voltage generated by the electrochemical action generated between the electrodes is changed by the vortex generated by the vortex generator, and the period of the voltage change is detected and the voltage is calculated over a unit time. The number of generated vortices is detected and the flow rate of the fluid is measured.
よってこの発明によれば被測定流体に一対の電極が援液
しているだけでよいから検出部の構造が簡単であり、耐
久性も高く本質安全防嬢構造とすることも容易で、且つ
安価に作ることができる等0の利点がある。Therefore, according to the present invention, since only a pair of electrodes are required to supplement the fluid to be measured, the structure of the detection section is simple, has high durability, can easily be made into an intrinsically safe structure, and is inexpensive. There is an advantage that it can be made into 0 etc.
以下にこの発明の一実施例を図面を用いて詳細に説明す
る。An embodiment of the present invention will be described in detail below with reference to the drawings.
第1図にこの発明の一実施例を示す。FIG. 1 shows an embodiment of the present invention.
図中1は被測定流体が流れる導管である。導管1の内壁
に6流体の流れと直交する位置に電極2a,2bを配贋
する。電極2a,2bは例えば白金或いはステンレス等
で作られ導管1に対し絶縁して支持される。このため導
管蔓が鋼管のような金属管の場合はこの内壁に絶縁ラィ
ニング層3が施され、ラィニング層3によって電極2a
,2bを互に絶縁して支持するようにしている。電極2
a,2bの取付位置の上流側に禍発生体4を設ける。In the figure, 1 is a conduit through which the fluid to be measured flows. Electrodes 2a and 2b are arranged on the inner wall of the conduit 1 at positions perpendicular to the flow of the six fluids. The electrodes 2a and 2b are made of, for example, platinum or stainless steel, and are supported insulated from the conduit 1. For this reason, when the conduit pipe is a metal pipe such as a steel pipe, an insulating lining layer 3 is provided on the inner wall of the pipe, and the lining layer 3
, 2b are mutually insulated and supported. Electrode 2
A disaster generator 4 is provided upstream of the mounting position of a and 2b.
渦発生体亀さま例えば円柱体にて構成することができる
。円柱体の軸は電極2〜 2bを結ぶ線と直交する向き
に取付けられる。このような構成によれば電極2a,2
bと流体との間には乱流境界層があり「境界層内部には
層流部分が存在する。The vortex generator can be constructed of, for example, a cylindrical body. The axis of the cylindrical body is attached in a direction perpendicular to the line connecting the electrodes 2 to 2b. According to such a configuration, the electrodes 2a, 2
There is a turbulent boundary layer between b and the fluid, and there is a laminar flow part inside the boundary layer.
層流部分では境界層表面の分子に引かれて層流内部の流
体分子も流動する。渦発生体4はその両側に交互に渦6
を発生し「渦6は下流側に流れる。渦6が片側の電極表
面に倒達すると、その電極表面の境界表面の境界層内の
分子(Dipole)配列が乱れる。このとき他方の電
極上には渦がないから〜この電極上の境界層内の分子配
列は乱れない。よって片側の電極上の分子配列の乱れに
より境界層内には流動電流が流れる。この流動電流によ
って電極28,2b間には電圧(流動電位の変動分)が
現われる。この流動電圧の大きさはまずこ比例する。的
ま電極材質流体とによって決まるゼータ電位、sは流体
の誘電率、Uは流体の動粘性係数、8は流体の導電率、
詳しくは朝倉書店発行「電極の化学参照)このように電
極2a,2b間に得られる流動電圧の大きさ‘ま流速に
関係なく、流体の種類、電極の材質によって決まる。こ
の大きさの変動分は例えば自動利得制御増幅器等で除去
できる。電極2a,2bに得られた流動電圧は第2図に
示すように前層増幅器7によって増幅し、その増幅出力
を自動利得制御増幅器8に供給し、一定のレベル増幅す
る。In the laminar flow section, fluid molecules inside the laminar flow also flow due to attraction by the molecules on the surface of the boundary layer. The vortex generator 4 has vortices 6 alternately on both sides thereof.
The vortex 6 flows downstream. When the vortex 6 reaches the surface of one electrode, the arrangement of molecules (Dipole) in the boundary layer on the boundary surface of that electrode surface is disturbed. At this time, the vortex 6 flows downstream. Since there is no vortex, the molecular arrangement in the boundary layer on this electrode is not disturbed.Therefore, due to the disturbance in the molecular arrangement on one side of the electrode, a flowing current flows in the boundary layer.This flowing current causes a flow between the electrodes 28 and 2b. A voltage (fluctuations in the flowing potential) appears.The magnitude of this flowing voltage is first proportional to the zeta potential determined by the target, electrode material, and fluid, s is the dielectric constant of the fluid, and U is the kinematic viscosity coefficient of the fluid. , 8 is the conductivity of the fluid,
For details, refer to "Electrode Chemistry" published by Asakura Shoten) The magnitude of the flowing voltage obtained between electrodes 2a and 2b is determined by the type of fluid and the material of the electrode, regardless of the flow velocity. can be removed by, for example, an automatic gain control amplifier.The flowing voltage obtained at the electrodes 2a and 2b is amplified by a front layer amplifier 7 as shown in FIG. 2, and its amplified output is supplied to an automatic gain control amplifier 8. Amplify to a certain level.
このようにして自動利得制御増幅器8の出力には渦発生
体川こよって発生した渦6の通過周期に対応した周波数
の信号が得られる。この信号の周波数fはf=KO毒
(1)
Kはストローハル数、d:渦発生体4の円柱の直径、V
:流体の流速、よって流動電圧の変動周波数f‘ま流体
の流速に比例し、この周波数fを測定することにより流
量を知ることができる。In this way, a signal with a frequency corresponding to the passage period of the vortex 6 generated by the vortex generator is obtained at the output of the automatic gain control amplifier 8. The frequency f of this signal is f = KO poison
(1) K is Strouhal number, d: diameter of cylinder of vortex generator 4, V
: The flow rate of the fluid, and hence the fluctuation frequency f' of the flowing voltage, is proportional to the flow rate of the fluid, and the flow rate can be determined by measuring this frequency f.
この点は従釆より渦流量計に利用されている。自動利得
制御増幅器8の出力に得られた流動電圧変動による周波
数信号は可変フィル夕9に供給される。This point is more commonly used in vortex flowmeters. The frequency signal resulting from the flowing voltage fluctuations obtained at the output of the automatic gain control amplifier 8 is supplied to a variable filter 9.
この可変フィル夕9はバンドバス特性を有し、このバン
ドバス特性の中心周波数が入力信号の周波数と一致する
ように自動制御される。こ可変フィル夕9は従来の過流
量計等にも使用され周知のものであるからこ)ではその
詳細説明は省0略する。可変フィル夕9によって流動電
位変動周波数信号を摘出し、その信号を必要に応じて波
形整形回路10‘こ供聯合し、その波形整形回路1川こ
て矩形波等に変換し、その矩形波信号を周波数又は周期
測定装置1−1に供給し「 この測定装置1 1夕にお
いて周波数fを測定し流量を求める。以上説明したよう
にこの発明によれば検出部は単に電極2a,2bを設け
、この電極2a,2bに発生する流動電圧の変動を検出
し「その変動周波数fから流量を求めるものであるから
、検出部0では特に動作に必要なェネルギを消費せず、
また構造も簡単であるから安価に作ることができる。第
3図はこの発明の他の実施例を示す。この例では渦発生
体4の両側に電極2a,2bを取付けた場合を示す。こ
のように構成しても渦発生体4夕の両側に交互に発生す
る渦6の影響により電極2a? 2b間に流動電圧の変
動を生じ、その周波数を測定することにより流体の流速
及び流量を知ることができる。第4図の例では渦発生体
4を三角柱状に形成し0その三角柱の一面に電極2a,
2bを並設し、その亀極取付面を上流側に向けて配置し
た場合を示す。This variable filter 9 has a bandpass characteristic, and is automatically controlled so that the center frequency of this bandpass characteristic coincides with the frequency of the input signal. This variable filter 9 is also used in conventional overflow meters and is well known, so a detailed explanation thereof will be omitted here. A variable filter 9 extracts a flowing potential fluctuation frequency signal, and the signal is combined with a waveform shaping circuit 10' as necessary, and the waveform shaping circuit 1 converts it into a rectangular wave or the like, and converts the signal into a rectangular wave signal. is supplied to the frequency or period measuring device 1-1, and the frequency f is measured in one evening with this measuring device 1 to determine the flow rate.As explained above, according to the present invention, the detection section is simply provided with the electrodes 2a and 2b, Fluctuations in the flowing voltage generated across the electrodes 2a and 2b are detected and the flow rate is determined from the fluctuation frequency f, so the detection unit 0 does not consume any energy necessary for operation.
Moreover, since the structure is simple, it can be manufactured at low cost. FIG. 3 shows another embodiment of the invention. This example shows a case where electrodes 2a and 2b are attached to both sides of the vortex generator 4. Even with this configuration, due to the influence of the vortices 6 that are generated alternately on both sides of the vortex generator 4, the electrode 2a? 2b, and by measuring the frequency, the flow rate and flow rate of the fluid can be determined. In the example shown in FIG. 4, the vortex generator 4 is formed into a triangular prism shape, and an electrode 2a is placed on one surface of the triangular prism.
2b are arranged side by side, with their tortoise pole mounting surfaces facing upstream.
このようにしても同様に渦によって流動電圧に変動を来
し、その周波数を測定することにより流体の流速及び流
量を知ることができる。タ 第5図の例では渦発生体4
に一方の電極2aを取付け、この電極と導電性導管1と
の間から流動電位変動信号を取出すように構成した場合
を示す。Even in this case, the vortices similarly cause fluctuations in the flowing voltage, and by measuring the frequency, the flow velocity and flow rate of the fluid can be determined. In the example shown in Figure 5, the vortex generator 4
A case is shown in which one electrode 2a is attached to the electrode 2a and a streaming potential fluctuation signal is extracted from between this electrode and the conductive conduit 1.
この場合には検出周波数は電極を2個用いた場合の1/
2となる。0 またこの他にも導管1内に流体を旋回さ
せる整流板と絞りを設け、流体の旋回により渦が歳菱運
動することを利用し、その歳差違動の周期から流体の流
速を知るようにしたいわゆるスワールメータにもこの発
生を適用できること容易に理解できよう。In this case, the detection frequency is 1/1 of that when two electrodes are used.
It becomes 2. 0 In addition, a rectifying plate and a throttle are installed in the conduit 1 to swirl the fluid, and the swirling of the fluid causes the vortex to perform a rhombic motion, so that the flow velocity of the fluid can be determined from the period of the precession. It is easy to understand that this generation can also be applied to so-called swirl meters.
このようにこの発明によれば検出部において電力等のェ
ネルギを必要としないから検出部の構造を簡素化できる
。As described above, according to the present invention, since energy such as electric power is not required in the detection section, the structure of the detection section can be simplified.
また本質安全防爆構造とすることもでき、爆発性流体の
流量測定器も容易に得ることができる。また電力消費は
増幅器7,8及び可変フィル夕9、波形整形回路10、
周波数又は周期測定装置11等に限られるため2線式伝
送方式を採ることもでき、更に金属の電極を単に鞍液す
ることによって渦の検出をする構造であるので高温流体
や高圧流体の検出も容易に実現でき応用範囲の広い流量
計ができる等の利点を有し、その効果は実用に供して頗
る大である。Furthermore, it can be made to have an intrinsically safe explosion-proof structure, and a flow rate measuring device for explosive fluids can be easily obtained. In addition, the power consumption is determined by the amplifiers 7 and 8, the variable filter 9, the waveform shaping circuit 10,
Since it is limited to the frequency or period measuring device 11, etc., a two-wire transmission method can be used.Furthermore, since the structure detects vortices by simply submerging the metal electrode, it is also possible to detect high-temperature fluids and high-pressure fluids. It has the advantage of being easily realized and capable of producing a flow meter with a wide range of applications, and its effects are extremely great in practical use.
第1図はこの発明の−実施例を示す断面図、第2図はこ
の発明の電気係の説明に供する係統図、第3図乃第5図
はこの発明の他の実施例を示す断面図である。
1:導管、2a,2b:電極、4:渦発生体、7:増幅
器。
オー四
対2図
*3図
才4図
氷5図Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a system diagram for explaining the electrical system of the invention, and Figs. 3 to 5 are sectional views showing other embodiments of the invention. It is. 1: conduit, 2a, 2b: electrodes, 4: vortex generator, 7: amplifier. O 4 vs. 2 figures *3 figures 4 figures ice 5 figures
Claims (1)
て発生させる渦発生体と、前記渦によつて生じる流体の
局部的な撹乱の影響を受ける位置に接液して設けられた
金属電極と、前記渦に関連して前記金属電極上の分子配
列の乱れにより発生する電圧を増幅する増幅器とより成
り、前記金属電極に生じる電圧変化の周波数により前記
流体の流速を測定して流量出力を出す渦流量計。1. A vortex generator that generates the number of vortices passing per unit time in proportion to the flow velocity of the fluid, and a metal provided in contact with the liquid at a position affected by local disturbance of the fluid caused by the vortex. It consists of an electrode and an amplifier that amplifies the voltage generated due to the disturbance of the molecular arrangement on the metal electrode in relation to the vortex, and measures the flow velocity of the fluid based on the frequency of the voltage change occurring on the metal electrode, and outputs the flow rate. A vortex flowmeter that emits
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54083108A JPS6022728B2 (en) | 1979-06-29 | 1979-06-29 | vortex flow meter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54083108A JPS6022728B2 (en) | 1979-06-29 | 1979-06-29 | vortex flow meter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS567014A JPS567014A (en) | 1981-01-24 |
JPS6022728B2 true JPS6022728B2 (en) | 1985-06-04 |
Family
ID=13792998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54083108A Expired JPS6022728B2 (en) | 1979-06-29 | 1979-06-29 | vortex flow meter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6022728B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS566566Y2 (en) * | 1975-09-01 | 1981-02-13 | ||
JPS5867006U (en) * | 1981-10-29 | 1983-05-07 | 株式会社ナカ技術研究所 | Vehicle guard device |
-
1979
- 1979-06-29 JP JP54083108A patent/JPS6022728B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS567014A (en) | 1981-01-24 |
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