JPH0719918A - Vortex flowmeter and vortex sensor - Google Patents
Vortex flowmeter and vortex sensorInfo
- Publication number
- JPH0719918A JPH0719918A JP5167824A JP16782493A JPH0719918A JP H0719918 A JPH0719918 A JP H0719918A JP 5167824 A JP5167824 A JP 5167824A JP 16782493 A JP16782493 A JP 16782493A JP H0719918 A JPH0719918 A JP H0719918A
- Authority
- JP
- Japan
- Prior art keywords
- vortex
- transmission shaft
- torque
- pressure
- receiving plate
- 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.)
- Granted
Links
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Abstract
Description
【０００１】[0001]
【技術分野】本発明は、渦流量計の渦センサに関し、よ
り詳細には、渦発生体に片持支持されて嵌挿され、渦発
生体内に導入されるカルマン渦の変動圧をトルク変動に
変換する渦流量計および渦センサに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vortex sensor for a vortex flowmeter, and more particularly, to a torque fluctuation of a fluctuation pressure of a Karman vortex that is cantilevered and supported by a vortex generator and is inserted into the vortex generator. A vortex flow meter and a vortex sensor for converting.
【０００２】[0002]
【従来技術】周知のように渦流量計は流体の流れの中に
配設された渦発生体を配設したとき、該渦発生体から単
位時間内に発生するカルマン渦の数が或るレイノルズ数
範囲で流量に比例することを利用した推定形の流量計で
ある。発生する渦は、渦発生体まわりに生ずる流れ変化
又は圧力変化として渦センサにより検出される。これら
の渦センサは、渦発生体内に固着されるか着脱可能に配
設されている。渦流量計は、気体、液体等流体の種類あ
るいは流体の密度や粘度に影響されることなくレイノル
ズ数のみに依存して特性が定められる特徴をもってい
る。しかし、カルマン渦の発生による変動圧は測定流体
の密度と流速の２乗に比例した量であるから、測定範囲
を拡大するためには小流量域での感度を高くすることが
必要である。この点において、渦発生体内に着脱可能に
配設される形式の渦センサは有利である。2. Description of the Related Art As is well known, in a vortex flowmeter, when a vortex generator disposed in a fluid flow is disposed, the number of Karman vortices generated from the vortex generator within a unit time is a certain Reynolds. It is an estimated type flow meter that utilizes the fact that it is proportional to the flow rate in several ranges. The generated vortex is detected by the vortex sensor as a flow change or a pressure change generated around the vortex generator. These vortex sensors are fixed in the vortex generator or are detachably arranged. The vortex flowmeter is characterized in that its characteristics are determined only by the Reynolds number without being affected by the type of fluid such as gas or liquid, or the density or viscosity of the fluid. However, since the fluctuating pressure due to the generation of Karman vortices is proportional to the density of the measured fluid and the square of the flow velocity, it is necessary to increase the sensitivity in the small flow rate region in order to expand the measurement range. In this respect, a vortex sensor of the type that is detachably arranged in the vortex generator is advantageous.
【０００３】本出願人は、特公昭６３−３１７２６号公
報において渦発生体の大きさによらず同一のセンサを着
脱可能とする渦流量計を提案した。図１０（ａ）,
（ｂ）は、この従来の渦流量計を説明するための図で、
図１０（ａ）は流れ方向からみた断面図、図（ｂ）は図
（ａ）の矢視Ｂ−Ｂ線断面図である。図中、３１は管
体、３２は渦発生体、３３は取付面、３４は圧力室、３
５は導圧孔、３６は円筒体、３７は弾性母材、３８は圧
電素子、３９は充填剤、４０は渦センサ、４１は鍔部、
４２はリード線である。The applicant of the present invention has proposed in Japanese Patent Publication No. 63-31726 a vortex flowmeter in which the same sensor can be attached and detached regardless of the size of the vortex generator. Figure 10 (a),
(B) is a figure for explaining this conventional vortex flowmeter,
10A is a cross-sectional view seen from the flow direction, and FIG. 10B is a cross-sectional view taken along the line BB of FIG. 10A. In the figure, 31 is a tube body, 32 is a vortex generator, 33 is a mounting surface, 34 is a pressure chamber, 3
5 is a pressure guide hole, 36 is a cylindrical body, 37 is an elastic base material, 38 is a piezoelectric element, 39 is a filler, 40 is a vortex sensor, 41 is a collar portion,
42 is a lead wire.
【０００４】図１０において、管体３１は被測定流体の
流通する配管に介装される本体で、直径上に渦発生体３
２が設けられている。渦発生体３２には管体３１を貫通
した凹部が設けられ、該凹部は圧力室３４となってお
り、圧力室３４の両側壁面に導圧孔３５が貫通し、被測
定流体に連通している。一方、圧力室３４には渦センサ
４０が挿入されている。渦センサ４０は、鍔部４１を有
する有底な円筒体状の振動管３６と、該振動管３６の底
部に受圧板３６ａが一体に形成され振動管３６内に同軸
に嵌挿された弾性母材３７と、該弾性母材３７の両側面
に貼着された圧電素子３８，３８と、振動管３６内に弾
性母材３７を一体固着する充填材３９及びリード線４２
とからなっている。In FIG. 10, a tube body 31 is a main body which is interposed in a pipe through which a fluid to be measured flows, and the vortex generator 3 has a diameter.
Two are provided. The vortex generator 32 is provided with a concave portion penetrating the tube body 31, and the concave portion serves as a pressure chamber 34. Pressure guiding holes 35 penetrate both side wall surfaces of the pressure chamber 34 and communicate with the fluid to be measured. There is. On the other hand, the vortex sensor 40 is inserted in the pressure chamber 34. The vortex sensor 40 includes a bottomed cylindrical vibrating tube 36 having a flange 41, and a pressure receiving plate 36 a integrally formed at the bottom of the vibrating tube 36, and an elastic mother body coaxially inserted into the vibrating tube 36. The material 37, the piezoelectric elements 38 and 38 attached to both side surfaces of the elastic base material 37, the filler 39 and the lead wire 42 for integrally fixing the elastic base material 37 in the vibrating tube 36.
It consists of
【０００５】渦センサ４０は振動管３６の鍔部４１にお
いて管体に形成された取付面３３で管体３１に片持固着
される。渦による変動圧力は、導圧孔３５を介して圧力
室３４に導入され受圧板３６ａに作用する。変動圧力を
受けた受圧板３６ａは片持固着された位置まわりに変動
するが、この変動は、充填剤３９を介して圧電素子に伝
達され振動に応じた電気信号（電荷）をリード線４２よ
り出力される。The vortex sensor 40 is cantilevered to the tube body 31 by a mounting surface 33 formed on the tube body at the collar portion 41 of the vibration tube 36. The fluctuating pressure due to the vortex is introduced into the pressure chamber 34 through the pressure guiding hole 35 and acts on the pressure receiving plate 36a. The pressure receiving plate 36a, which receives the fluctuating pressure, fluctuates around the cantilevered and fixed position. This fluctuation is transmitted to the piezoelectric element via the filler 39 and an electric signal (charge) corresponding to the vibration is transmitted from the lead wire 42. Is output.
【０００６】しかし、上述の従来の渦センサの振動管２
６は、鍔部３１で片持固定されており、圧電素子３８，
３８は顎部４１を支点として単振動する。渦流量計は流
管に介装され流管とともに外部振動により加振され、こ
れに従って振動管２６も振動する。特に、振動が渦信号
と同相の場合は外部振動を打ち消すために高価な補償手
段を必要とする。また、変動圧力は流速の２乗に比例す
るので小流感度を上げて流量範囲を拡大することが試み
られるが、前述の如く、配管系には微小振動が常に加わ
っているので安定して小流限度をあげることができなか
った。そして外部から受ける衝撃は流量パルスのミスパ
ルス発生を意味し、信頼性を低下させる。However, the vibration tube 2 of the conventional vortex sensor described above is used.
6 is cantilevered and fixed by the collar portion 31, and the piezoelectric element 38,
38 makes a simple vibration with the jaw 41 as a fulcrum. The vortex flowmeter is interposed in the flow tube and is excited by the external vibration together with the flow tube, and the vibration tube 26 also vibrates accordingly. Particularly when the vibration is in phase with the vortex signal, an expensive compensating means is required to cancel the external vibration. Further, since the fluctuating pressure is proportional to the square of the flow velocity, it is attempted to increase the small flow sensitivity to expand the flow rate range. However, as mentioned above, the pipe system is constantly subject to small vibrations, so it is stable and small. I could not raise the flow limit. The impact received from the outside means the occurrence of a flow rate pulse miss pulse, which lowers the reliability.
【０００７】[0007]
【目的】本発明は、上述の如き実情に鑑みてなされたも
ので、外部振動影響を受け難く、信頼性の高い渦信号を
検知する渦流量計および渦センサを検出することを目的
としてなされたものである。[Purpose] The present invention has been made in view of the above circumstances, and has an object to detect a vortex flowmeter and a vortex sensor that detect a vortex signal with high reliability that is not easily affected by external vibration. It is a thing.
【０００８】[0008]
【構成】本発明は、上記目的を達成するために、（１）
測定流体が流れる本体と、該本体内に両端が固着される
柱状体で一端側軸方向に圧力室および各々の側面から前
記圧力室に測定流体圧を導入する一対の導圧孔を有する
渦発生体と、前記一対の導圧孔より前記圧力室に導入さ
れたカルマン渦に基づく変動圧力を交番捩り振動として
検知する渦センサとからなること、更には、（２）前記
（１）において、前記圧力室内に僅かの隙間を有し挿入
される筒状体の一端に受圧板および前記筒状体を片持支
持するフランジを有する振動管と、一端が該振動管内の
前記受圧板側に同軸に固着される伝達軸と、該伝達軸の
他端側に配設され、前記受圧板に作用するトルクを前記
伝達軸を介して前記振動管との間で検知するトルク検出
素子とを有すること、更には、（３）前記（２）におい
て、振動管及び又はトルク検出素子と伝達軸とを、該伝
達軸と略直角な面の板ばねを介して接続し、前記伝達軸
を軸方向にのみ移動可能に固着したこと、更には、
（４）前記（２）において、振動管及び又はトルク検出
素子と伝達軸とを接続する該伝達軸の軸方向にスリット
を有し、該伝達軸を軸方向に移動可能に固着したこと、
更には、（５）前記（１）又は（４）において、前記圧
力室内に僅かの隙を有し挿入され、凹部を有する受圧板
および該受圧板を片持支持するフランジを有する振動管
と、一端が前記凹部内に前記振動管に同軸に固着される
トルクの伝達軸と、該伝達軸の他端側と前記振動管間に
接続され、前記伝達軸を介して前記受圧板に作用するト
ルクを検知するトルク検出器とからなること、更には、
（６）前記（１）において、凹部を有する受圧板および
取付フランジとからなる振動管と、該振動管の凹部と同
軸に一端が固着され他端に接続部を有するトルクの伝達
軸と、該伝達軸の接続部に着脱自在に前記振動管に固着
したトルク検出手段とからなること、或いは、（７）凹
部および該凹部内に配設された接続部を有する受圧板お
よび取付フランジとからなる振動管と、一端に前記接続
部と軸方向に着脱可能に接続する接手を有する伝達軸
と、該伝達軸の他端に固着され前記振動管との間のトル
クを検知するトルク検出手段とからなること、更には、
（８）前記（７）において、測定流体が流れる本体と、
該本体内に一端が固着された下部渦発生体と該下部渦発
生体と同軸な上部渦発生体と、該上部渦発生体と前記本
体とを接続し前記上部渦発生体に作用するカルマン渦に
よるトルクを検知するトルク検出器とからなること、更
には、（９）前記（８）において、前記渦発体他部に該
渦発生体他部の重心がトルク検出器と同軸上となるよう
に前記渦発生体他部に穴を穿設したことを特徴とするも
のである。以下、本発明の実施例に基づいて説明する。In order to achieve the above object, the present invention provides (1)
A vortex generator having a main body through which a measurement fluid flows and a columnar body having both ends fixed inside the main body and having a pressure chamber in the axial direction at one end side and a pair of pressure guiding holes for introducing the measurement fluid pressure from each side surface to the pressure chamber. A body and a vortex sensor for detecting a fluctuating pressure based on a Karman vortex introduced into the pressure chamber through the pair of pressure guiding holes as an alternating torsional vibration, and further (2) in (1) above, A vibrating tube having a pressure receiving plate and a flange for cantilever supporting the cylindrical body at one end of a cylindrical body inserted with a slight gap in the pressure chamber, and one end being coaxial with the pressure receiving plate side in the vibrating tube. A transmission shaft that is fixed, and a torque detection element that is disposed on the other end side of the transmission shaft and that detects the torque acting on the pressure receiving plate between the vibration pipe and the transmission pipe via the transmission shaft; Furthermore, (3) In the above (2), the vibration tube and / or And a torque detection element transmission shaft, that is connected via a leaf spring said transfer axis and substantially perpendicular to the plane, and fixed movably said transmission shaft in the axial direction only, and further,
(4) In (2) above, a slit is provided in the axial direction of the transmission shaft that connects the vibration tube and / or the torque detection element to the transmission shaft, and the transmission shaft is fixed so as to be movable in the axial direction.
Furthermore, (5) In (1) or (4) above, a vibrating tube having a pressure receiving plate having a concave portion and inserted into the pressure chamber with a slight gap, and a flange for cantilever supporting the pressure receiving plate, A torque transmission shaft whose one end is coaxially fixed to the vibration pipe in the recess, and a torque which is connected between the other end of the transmission shaft and the vibration pipe and which acts on the pressure receiving plate via the transmission shaft. And a torque detector for detecting
(6) In the above (1), a vibrating tube including a pressure receiving plate having a concave portion and a mounting flange, a torque transmission shaft having one end fixed coaxially with the concave portion of the vibrating tube and a connecting portion at the other end, It is composed of a torque detecting means which is detachably fixed to the vibrating tube at a connecting part of the transmission shaft, or (7) It is composed of a pressure receiving plate and a mounting flange having a recess and a connecting part disposed in the recess. A vibrating tube, a transmission shaft that has a joint at one end that is detachably connected to the connecting portion in the axial direction, and a torque detection unit that is fixed to the other end of the transmission shaft and that detects torque between the vibrating tube. What is more,
(8) In (7) above, a main body through which the measurement fluid flows,
A lower vortex generator having one end fixed to the main body, an upper vortex generator coaxial with the lower vortex generator, and a Karman vortex that acts on the upper vortex generator by connecting the upper vortex generator and the main body. (9) In (8), the center of gravity of the vortex generator other portion is coaxial with the torque detector in (9) above (8). Further, a hole is bored in the other part of the vortex generator. Hereinafter, description will be given based on examples of the present invention.
【０００９】図１（ａ）,（ｂ）,（ｃ）は、本発明によ
る渦流量計の一例を説明するための部分断面図であり、
図１（ａ）は流れＱ方向の一部断面図、図１（ｂ）は図
１（ａ）の矢視Ｂ−Ｂ線断面図、図１（ｃ）は図１
（ａ）の矢視Ｃ−Ｃ線断面図で、図１中、１は本体、２
は渦発生体、３は圧力室、４，５は導圧孔、６は振動
管、７は凹部、８は保持部材、９は伝達部材、１０，１
１，１２，１３は圧電素子、１４は伝達軸、１５はシー
ルリングである。FIGS. 1A, 1B and 1C are partial sectional views for explaining an example of the vortex flowmeter according to the present invention.
1A is a partial cross-sectional view in the flow Q direction, FIG. 1B is a cross-sectional view taken along the line BB of FIG. 1A, and FIG.
FIG. 1 is a sectional view taken along line CC of FIG.
Is a vortex generator, 3 is a pressure chamber, 4 and 5 are pressure guide holes, 6 is a vibrating tube, 7 is a recess, 8 is a holding member, 9 is a transmission member, 10, 1
1, 12 and 13 are piezoelectric elements, 14 is a transmission shaft, and 15 is a seal ring.
【００１０】図１（ａ）において、渦発生体２は、図１
（ｂ）に示すように断面二等辺三角状をした柱状体で、
測定流体が流れる筒状の本体１に両端が固定されてい
る。渦発生体２には軸方向に圧力室３が穿設されてお
り、この圧力室３には、渦発生体２の側面に開口する導
圧孔４，５が連通している。導圧孔４，５は、圧力室３
の下方に、軸方向からみて互いに交叉するように交わる
ことなく所定の間隔Δを隔て穿孔されている。In FIG. 1A, the vortex generator 2 is shown in FIG.
A columnar body having an isosceles triangular cross section as shown in (b),
Both ends are fixed to a cylindrical main body 1 through which the measurement fluid flows. A pressure chamber 3 is bored in the vortex generator 2 in the axial direction, and pressure guiding holes 4 and 5 opening to the side surface of the vortex generator 2 communicate with the pressure chamber 3. The pressure guide holes 4 and 5 are provided in the pressure chamber 3
Are perforated at a predetermined interval Δ without intersecting each other when viewed from the axial direction.
【００１１】図２（ａ）,（ｂ）は、本発明に係る渦発
生体２の導圧孔４，５の一例を説明するための図であ
り、図（ａ）は圧力室３の下部位置の断面図、図（ｂ）
は導圧孔４位置での断面図である。図２（ａ）,（ｂ）
に示すように導圧孔４，５には、各々圧力室３を挟んだ
位置に軸方向に伸び圧力室３に連通する導圧路４ａ，４
ｂおよび５ａ，５ｂがそれぞれ開口している。2 (a) and 2 (b) are views for explaining an example of the pressure guiding holes 4 and 5 of the vortex generator 2 according to the present invention. FIG. 2 (a) is a lower portion of the pressure chamber 3. Position cross-section, Figure (b)
[FIG. 3] is a cross-sectional view at the pressure guiding hole 4 position. 2 (a), (b)
As shown in FIG. 4, the pressure guiding holes 4 and 5 extend axially at positions sandwiching the pressure chamber 3 and communicate with the pressure chambers 4 a and 4 respectively.
b and 5a, 5b are open.
【００１２】一方、前記圧力室３には、振動管６の一端
に取り付けられた受圧板６ａが圧力室３と僅かの隙を有
して挿入される。振動管６は、図１（ａ）に示すよう
に、一端側に受圧板６ａを有する有底の凹部７をもった
筒状体で、筒状体は、中間部に取付フランジ６ｃを有
し、該取付フランジ６ｃの下方は有底の筒体６ｂ、上方
は上部開口筒６ｄとからなり、これらは、一体に加工さ
れている。振動管６は、本発明の渦センサの一要素とな
るもので、渦センサは振動管６と伝達軸１４と、保持部
材８と、伝達部材９と圧電素子１０，１１，１２，１３
とからなっている。On the other hand, a pressure receiving plate 6a attached to one end of the vibration tube 6 is inserted into the pressure chamber 3 with a slight clearance from the pressure chamber 3. As shown in FIG. 1A, the vibrating tube 6 is a tubular body having a bottomed concave portion 7 having a pressure receiving plate 6a at one end side, and the tubular body has a mounting flange 6c in the middle portion. The bottom of the mounting flange 6c is a bottomed cylinder 6b, and the top is an upper opening cylinder 6d, which are integrally machined. The vibration tube 6 is one element of the vortex sensor of the present invention. The vortex sensor includes the vibration tube 6, the transmission shaft 14, the holding member 8, the transmission member 9, and the piezoelectric elements 10, 11, 12, 13.
It consists of
【００１３】上記要素から構成される渦センサは、振動
管６の凹部７と同軸に伝達軸１４の一端を筒体６ｂの底
部に固着し、他端に四角柱の伝達部材９を同軸に固着す
る。一方、伝達部材９外周には上部開口６ｄ内壁面に固
着された筒状の保持部材８が配設される。保持部材８は
絶縁材からなり、導電性材の伝達部材９の四角形外周よ
りも僅かに大きい同形の四角形の透孔を有し、該保持部
材８と伝達部材９との四角形の空隙部には図１（ｃ）に
示すように各々厚さ方向に分極された圧電素子１０，１
１，１２，１３が固着されている。ここで、対向する辺
の圧電素子１０，１１および１２，１３は各々接続さ
れ、伝達部材９は振動管６を介して本体１側に接地され
る。以上の如く構成された渦センサは、シールリング１
５でシールされ取付フランジ６ｃにより本体１にボルト
締めされ固着される。In the vortex sensor composed of the above-mentioned elements, one end of the transmission shaft 14 is fixed to the bottom of the cylindrical body 6b coaxially with the recess 7 of the vibration tube 6, and a quadrangular prism transmission member 9 is coaxially fixed to the other end. To do. On the other hand, a cylindrical holding member 8 fixed to the inner wall surface of the upper opening 6d is arranged on the outer circumference of the transmission member 9. The holding member 8 is made of an insulating material and has a rectangular through hole of the same shape that is slightly larger than the rectangular outer circumference of the conductive member transmission member 9, and the holding member 8 and the transmission member 9 have a rectangular void. As shown in FIG. 1C, the piezoelectric elements 10 and 1 are polarized in the thickness direction.
1, 12, 13 are fixed. Here, the piezoelectric elements 10, 11 and 12, 13 on opposite sides are connected to each other, and the transmission member 9 is grounded to the main body 1 side via the vibration tube 6. The vortex sensor configured as described above has the seal ring 1
It is sealed by 5, and is bolted and fixed to the main body 1 by the mounting flange 6c.
【００１４】次に、図１（ａ）の如く構成された渦流量
計の動作を述べる。流体が矢印Ｑ方向に流れると渦発生
体２の下方にはカルマン渦が発生し、これに伴ない変動
圧力が生ずる。この変動圧は導圧孔４，５より圧力室３
内に導入されるが、圧力室３内には受圧板６ａが挿入さ
れているので変動圧力は受圧板６ａに作用する。導圧孔
４の圧力が、導圧孔５の圧力よりも高い渦サイクルで
は、図１（ｂ）に示すように導圧孔４の圧力Ｐ1は、受
圧板６ａを挟んで図示の受圧板６ａの上下方向に関し反
対向きに作用する。このとき導圧孔５の圧力Ｐ2は、同
様に反対向きに作用するので受圧板６ａには左向きのト
ルクが発生する。同様にして次の渦サイクルでは右向き
のトルクが発生してカルマン渦に同期した交番トルクが
生ずる。この交番トルクは伝達軸１４を介して圧電素子
９，１０，１１，１２を押圧してトルクに応じた電荷を
発生する。Next, the operation of the vortex flowmeter constructed as shown in FIG. 1 (a) will be described. When the fluid flows in the direction of arrow Q, a Karman vortex is generated below the vortex generator 2 and a fluctuating pressure is generated accordingly. This fluctuating pressure is applied to the pressure chamber 3 through the pressure guiding holes 4 and 5.
The pressure receiving plate 6a is inserted into the pressure chamber 3, so that the fluctuating pressure acts on the pressure receiving plate 6a. In a vortex cycle in which the pressure in the pressure guiding hole 4 is higher than the pressure in the pressure guiding hole 5, the pressure P 1 in the pressure guiding hole 4 is as shown in FIG. 6a acts in the opposite direction with respect to the vertical direction. At this time, the pressure P 2 of the pressure guiding hole 5 similarly acts in the opposite direction, so that a leftward torque is generated in the pressure receiving plate 6a. Similarly, in the next vortex cycle, a rightward torque is generated and an alternating torque synchronized with the Karman vortex is generated. This alternating torque presses the piezoelectric elements 9, 10, 11, 12 via the transmission shaft 14 to generate electric charges according to the torque.
【００１５】図３は、圧電素子に発生する電荷と信号と
の関係を説明するための表で、（ａ）,（ｂ）はカルマ
ン渦に基づく信号、（ｃ）〜（ｈ）は外部振動に基づく
信号を示す。カルマン渦に基づく信号（ａ）,（ｂ）
は、前述の如く右廻り方向のトルクと左廻り方向のトル
クに応じた信号を出力する。これに対し、流管に対し斜
め方向の信号（ｃ）,（ｄ）は対向する圧電素子１０，
１１および１２，１３の電荷が相殺され信号出力はな
い。次に（ｅ），（ｆ）で示す流管の軸方向の振動及
び、（ｇ）、（ｈ）で示す流管と直角方向の振動では互
いに反対のマイナスの出力が生ずる。しかし、通常流管
軸方向の振動は無視されることが多く、流管と直角方向
の振動のみを考慮すればよいが、この時の信号は、常に
マイナス信号となるのでこの補償は簡単に行うことがで
きる。FIG. 3 is a table for explaining the relationship between the electric charge generated in the piezoelectric element and the signal. (A) and (b) are signals based on the Karman vortex, and (c) to (h) are external vibrations. Shows a signal based on. Signals (a), (b) based on Karman vortices
Outputs a signal corresponding to the torque in the clockwise direction and the torque in the counterclockwise direction as described above. On the other hand, the signals (c) and (d) in the oblique direction with respect to the flow tube are opposed to the piezoelectric element 10,
There is no signal output because the charges of 11 and 12 and 13 are canceled out. Next, the vibrations in the axial direction of the flow tube shown in (e) and (f) and the vibrations in the directions perpendicular to the flow tube shown in (g) and (h) produce negative outputs opposite to each other. However, the vibration in the axial direction of the flow tube is usually neglected, and only the vibration in the direction perpendicular to the flow tube should be considered. However, since the signal at this time is always a negative signal, this compensation is easily performed. be able to.
【００１６】図４（ａ）、（ｂ）は、本発明における渦
センサの他の実施例を説明するための図である。図４
（ａ）は断面図、図４（ｂ）は図４（ａ）のＢ部の斜視
図で、図中１６は板ばねである。図１と同じ作用する部
分には図１と同一の参照番号を付している。図４（ａ）
において伝達軸１４は振動管６に直接固着するのではな
く、伝達軸１４に直角な面を有する偏平な板ばね１６を
介して接続されるもので、環境温度の変化に対し伝達軸
１４の熱膨張又は収縮を板ばね１６の歪として吸収し、
トルク変動には影響を与えないようにしている。板ばね
１６は、筒体６ｂ底部に直接又は挿入部材１６ａを介し
て接続される。また、板ばね１６は、伝達部材９との間
に接続してもよい。FIGS. 4A and 4B are views for explaining another embodiment of the vortex sensor according to the present invention. Figure 4
4A is a sectional view, FIG. 4B is a perspective view of a portion B of FIG. 4A, and 16 in the drawing is a leaf spring. The same parts as in FIG. 1 are designated by the same reference numerals as in FIG. Figure 4 (a)
In the above, the transmission shaft 14 is not directly fixed to the vibrating tube 6 but is connected via a flat leaf spring 16 having a surface perpendicular to the transmission shaft 14. Absorbs expansion or contraction as strain of the leaf spring 16,
The torque fluctuation is not affected. The leaf spring 16 is connected to the bottom of the tubular body 6b directly or via the insertion member 16a. Further, the leaf spring 16 may be connected to the transmission member 9.
【００１７】図５（ａ）、（ｂ）は本発明による渦セン
サの、更に他の実施例を説明するための図であり図５
（ａ）流れ方向から見た断面図。図５（ｂ）は図５
（ａ）のＢ部斜視図であり、図中、１７は振動管、１８
は縦溝で図１と同じ作用する部分には図１と同一の参照
番号を付している。図５（ａ）の渦センサにおける振動
管１７は、受圧板１７ａと取付フランジ１７ｃとで構成
され、取付フランジ１７ｃと受圧板１７ａとは捩り剛性
を小さくするための挟少部１７ｂで接続されている。受
圧板１７ａ内には凹部７が形成され、底部には伝達軸１
４の一端が固着されているが伝達部材９側は二面幅を有
し軸方向に縦溝１８が穿設され、熱膨張により伝達軸１
４が自由に摺動でき、しかも、トルクが伝達できるよう
にしている。FIGS. 5A and 5B are views for explaining still another embodiment of the vortex sensor according to the present invention.
(A) Sectional view seen from the flow direction. 5 (b) is shown in FIG.
It is a B section perspective view of (a), 17 is a vibrating tube, 18 is a figure.
The same reference numerals as those in FIG. 1 are attached to the vertical grooves which have the same functions as those in FIG. The vibrating tube 17 in the vortex sensor of FIG. 5A is composed of a pressure receiving plate 17a and a mounting flange 17c, and the mounting flange 17c and the pressure receiving plate 17a are connected by a pinching portion 17b for reducing torsional rigidity. There is. A recess 7 is formed in the pressure receiving plate 17a, and the transmission shaft 1 is provided at the bottom.
Although one end of the transmission shaft 4 is fixed, the transmission member 9 side has a two-sided width and a vertical groove 18 is bored in the axial direction.
4 can slide freely and can transmit torque.
【００１８】図６は、本発明による渦センサの更に他の
実施例を説明する為の図である。図中１９は固定筺、２
０は伝達部材で、図１、５と同じ作用する部分には図
１、５と同一の参照番号を付している。図６に示した渦
センサは振動管１７と圧電素子１０〜１３とを着脱可能
とした構造のもので、伝達軸１４の他端には、例えば、
両面取りした挿入部１４ａを有し、該挿入部１４ａと伝
達部材２０とは矢印方向に着脱できるように嵌合され
る。伝達部材２０と保持部材８および圧電素子１０〜１
３は固定筺内に一体に収容され、固定筺１９は上部開口
１７ｄ内に着脱可能に固着され、圧電素子１０〜１３が
不良となったとき変換可能としている。FIG. 6 is a view for explaining still another embodiment of the vortex sensor according to the present invention. In the figure, 19 is a fixed housing, 2
Reference numeral 0 is a transmission member, and the same acting portions as those in FIGS. 1 and 5 are denoted by the same reference numerals as those in FIGS. The vortex sensor shown in FIG. 6 has a structure in which the vibrating tube 17 and the piezoelectric elements 10 to 13 are attachable and detachable, and at the other end of the transmission shaft 14, for example,
It has a double-sided insertion portion 14a, and the insertion portion 14a and the transmission member 20 are fitted so as to be detachable in the arrow direction. Transmission member 20, holding member 8 and piezoelectric elements 10 to 1
3 is integrally housed in the fixed housing, and the fixed housing 19 is detachably fixed in the upper opening 17d so that it can be converted when the piezoelectric elements 10 to 13 become defective.
【００１９】図７は、本発明による渦センサの、更に他
の実施例を説明するための図である。図中、２１はさ
や、２２は固定輪、２３は接合端で、図１、６と同じ作
用をする部分には、図１、６と同一の参照番号を付して
いる。図７に示した渦センサは、振動管１７に対し、圧
電素子１０〜１３を備えた伝達軸１４を着脱可能に固着
するもので伝達軸１４の一端に二面幅又は断面四角状の
縦溝を有する接合端２３を固着し、該接合端２３と受圧
板１７ａ凹部７の底面に固着した固定輪２２とが着脱可
能に係合するようになっている。FIG. 7 is a view for explaining still another embodiment of the vortex sensor according to the present invention. In the figure, 21 is a sheath, 22 is a fixed ring, and 23 is a joining end, and the parts having the same functions as those in FIGS. 1 and 6 are denoted by the same reference numerals as in FIGS. The vortex sensor shown in FIG. 7 is configured such that a transmission shaft 14 having piezoelectric elements 10 to 13 is detachably fixed to a vibration tube 17, and a vertical groove having a dihedral width or a square cross section is provided at one end of the transmission shaft 14. The joint end 23 having the above is fixed, and the joint end 23 and the fixed ring 22 fixed to the bottom surface of the recess 7 of the pressure receiving plate 17a are detachably engaged.
【００２０】図８は本発明による渦流量計の他の実施例
を説明するための図で、図中、２４は固定リング、２５
は渦センサ、２６は保護筒である。図８の渦発生体２は
上部渦発生体２ｂと下部渦発生体２ａとに分離され、下
部渦発生体２ａの一端は本体１内に固着され、他端は自
由端となり、上部渦発生体２ｂと僅かの隙を有してい
る。また、上部渦発生体２ｂには渦センサ２５が接続さ
れる。尚、渦センサ２５は、図１に示したトルク検出セ
ンサと同一のもので、該渦センサ２５は上部渦発生体２
ｂに同軸な保護筒２３とともに一体に取り付けられる。
また、渦センサ２５は本体１の壁面に取り付けられた固
定リング２４に同軸に固着される。上部渦発生体２ｂに
は、渦発生に伴う交番揚力が作用するため、この交番揚
力を渦センサ２５によってトルク信号として検知するこ
とができる。この時、上部渦発生体２ｂと渦センサ２５
は上部渦発生体２ｂの重心を通る軸で接合されることが
必要である。FIG. 8 is a view for explaining another embodiment of the vortex flowmeter according to the present invention, in which 24 is a fixing ring and 25 is a fixing ring.
Is a vortex sensor, and 26 is a protective cylinder. The vortex generator 2 of FIG. 8 is separated into an upper vortex generator 2b and a lower vortex generator 2a, one end of the lower vortex generator 2a is fixed in the main body 1, and the other end is a free end. It has a slight gap of 2b. A vortex sensor 25 is connected to the upper vortex generator 2b. The vortex sensor 25 is the same as the torque detection sensor shown in FIG.
It is attached integrally with the protective cylinder 23 coaxial with b.
Further, the vortex sensor 25 is coaxially fixed to the fixing ring 24 attached to the wall surface of the main body 1. Since an alternating lift force due to the generation of vortices acts on the upper vortex generator 2b, this alternating lift force can be detected by the vortex sensor 25 as a torque signal. At this time, the upper vortex generator 2b and the vortex sensor 25
Must be joined at an axis passing through the center of gravity of the upper vortex generator 2b.
【００２１】図９（ａ），（ｂ）は、図８の渦流量計の
他の実施例を説明するための図である。図９（ａ）重心
Ｇを移動するための穴明け部。図９（ｂ）は動作を示す
図である。図９（ａ）は上部渦発生体２ｂに所定の大き
さの穴２６を穿孔して重心位置Ｇを渦センサ２２と同軸
上に移動した状態とし、上部渦発生体２ｂは図９（ｂ）
に示すように重心Ｇを支点として角度θだけ交番回転す
るので、渦センサ２５には曲げモーメントが作用するこ
となく、完全な交番捩り振動のみが作用する。9A and 9B are views for explaining another embodiment of the vortex flowmeter of FIG. FIG. 9A is a holed portion for moving the center of gravity G. FIG. 9B is a diagram showing the operation. FIG. 9A shows a state in which a hole 26 of a predetermined size is drilled in the upper vortex generator 2b to move the center of gravity position G coaxially with the vortex sensor 22, and the upper vortex generator 2b is shown in FIG. 9B.
As shown in FIG. 7, since the vortex sensor 25 is rotated by an angle θ about the center of gravity G as a fulcrum, no bending moment acts on the vortex sensor 25, and only complete alternating torsional vibration acts.
【００２２】[0022]
【効果】以上の説明から明らかなように、本発明によれ
ばカルマン渦による信号を交番捩り振動として検出する
ので、流管振動影響は流管軸方向と流管と直角方向の振
動影響のみ受ける。しかし、流管軸方向の振動影響は殆
どないので、実質的には流管と直角方向の振動影響のみ
受ける。しかし、この振動影響は一方向のノイズ成分と
なるので簡単に補正可能であり、高い安定性のある渦信
号を高感度に検出することができる。[Effect] As is clear from the above description, according to the present invention, the signal due to the Karman vortex is detected as the alternating torsional vibration, so that the flow tube vibration is affected only by the vibration in the axial direction of the flow tube and in the direction orthogonal to the flow tube. . However, since there is almost no vibration effect in the axial direction of the flow tube, only the vibration effect in the direction perpendicular to the flow tube is substantially received. However, since this vibration effect is a noise component in one direction, it can be easily corrected and a highly stable eddy signal can be detected with high sensitivity.
【図１】 本発明による渦流量計の一例を説明するため
の部分断面図である。FIG. 1 is a partial sectional view for explaining an example of a vortex flowmeter according to the present invention.
【図２】 本発明に係る渦の導圧孔の一例を説明するた
めの図である。FIG. 2 is a diagram for explaining an example of a pressure guiding hole for a vortex according to the present invention.
【図３】 圧電素子に発生する電荷と信号との関係を説
明するための表である。FIG. 3 is a table for explaining a relationship between a charge generated in a piezoelectric element and a signal.
【図４】 本発明における渦センサの、他の実施例を説
明するための図である。FIG. 4 is a diagram for explaining another embodiment of the vortex sensor according to the present invention.
【図５】 本発明による渦センサの、更に、他の実施例
を説明するための図である。FIG. 5 is a view for explaining still another embodiment of the vortex sensor according to the present invention.
【図６】 本発明による渦センサの、更に、他の実施例
を説明するための図であるFIG. 6 is a view for explaining still another embodiment of the vortex sensor according to the present invention.
【図７】 本発明による渦センサの、更に、他の実施例
を説明するための図である。FIG. 7 is a view for explaining still another embodiment of the vortex sensor according to the present invention.
【図８】 本発明による渦流量計の、他の実施例を説明
するための図である。FIG. 8 is a diagram for explaining another embodiment of the vortex flowmeter according to the present invention.
【図９】 図８の渦流量計の、他の実施例を説明するた
めの図である。9 is a diagram for explaining another embodiment of the vortex flowmeter of FIG.
【図１０】 従来の渦流量計を説明するための図であ
る。FIG. 10 is a diagram for explaining a conventional vortex flowmeter.
１…本体、２…渦発生体、３…圧力室、４，５…導圧
孔、６…振動管、７…凹部、８…保持部材、９…伝達部
材、１０，１１，１２，１３…圧電素子、１４…伝達
軸、１５…シールリング、１６…板ばね、１７…振動
管、１８…縦溝、１９…固定筺、２０…伝達部材、２１
…さや、２２…固定輪、２３…接合端、２４…固定リン
グ、２５…渦センサ、２６…保護筒。DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Vortex generator, 3 ... Pressure chamber, 4, 5 ... Pressure guide hole, 6 ... Oscillation tube, 7 ... Recessed part, 8 ... Holding member, 9 ... Transmission member, 10, 11, 12, 13 ... Piezoelectric element, 14 ... Transmission shaft, 15 ... Seal ring, 16 ... Leaf spring, 17 ... Vibration tube, 18 ... Vertical groove, 19 ... Fixed casing, 20 ... Transmission member, 21
... sheath, 22 ... fixed ring, 23 ... joining end, 24 ... fixing ring, 25 ... vortex sensor, 26 ... protective cylinder.
Claims (9)
端が固着される柱状体で一端側軸方向に圧力室および各
々の側面から前記圧力室に測定流体圧を導入する一対の
導圧孔を有する渦発生体と、前記一対の導圧孔より前記
圧力室に導入されたカルマン渦に基づく変動圧力を交番
捩り振動として検知する渦センサとからなることを特徴
とした渦流量計。1. A main body through which a measurement fluid flows, and a columnar body having both ends fixed inside the main body, and a pair of pressure guides for introducing the measurement fluid pressure into the pressure chamber in the axial direction at one end side and the respective side surfaces into the pressure chamber. A vortex flowmeter comprising: a vortex generator having a hole; and a vortex sensor for detecting a fluctuating pressure based on a Karman vortex introduced into the pressure chamber through the pair of pressure guiding holes as an alternating torsional vibration.
れる筒状体の一端に受圧板および前記筒状体を片持支持
するフランジを有する振動管と、一端が該振動管内の前
記受圧板側に同軸に固着される伝達軸と、該伝達軸の他
端側に配設され、前記受圧板に作用するトルクを前記伝
達軸を介して前記振動管との間で検知するトルク検出素
子とを有することを特徴とする請求項１記載の渦セン
サ。2. A vibrating tube having a pressure receiving plate and a flange for cantilever supporting the tubular body at one end of the tubular body inserted with a slight gap in the pressure chamber, and one end of the vibrating tube inside the vibrating tube. A transmission shaft that is coaxially fixed to the pressure receiving plate side, and torque detection that is arranged at the other end side of the transmission shaft and that detects the torque acting on the pressure receiving plate between the vibration pipe and the transmission shaft via the transmission shaft. The vortex sensor according to claim 1, further comprising an element.
とを、該伝達軸と略直角な面の板ばねを介して接続し、
前記伝達軸を軸方向にのみ移動可能に固着したことを特
徴とする請求項２記載の渦センサ。3. A vibrating tube and / or a torque detecting element and a transmission shaft are connected via a leaf spring having a surface substantially perpendicular to the transmission shaft,
The vortex sensor according to claim 2, wherein the transmission shaft is fixed so as to be movable only in the axial direction.
とを接続する該伝達軸の軸方向にスリットを有し、該伝
達軸を軸方向に移動可能に固着したことを特徴とする請
求項２記載の渦センサ。4. A transmission shaft connecting a vibration tube and / or a torque detecting element to a transmission shaft has a slit in the axial direction, and the transmission shaft is fixed so as to be movable in the axial direction. The eddy sensor according to 2.
れ、凹部を有する受圧板および該受圧板を片持支持する
フランジを有する振動管と、一端が前記凹部内に前記振
動管に同軸に固着されるトルクの伝達軸と、該伝達軸の
他端側と前記振動管間に接続され、前記伝達軸を介して
前記受圧板に作用するトルクを検知するトルク検出器と
からなることを特徴とした請求項１又は請求項４記載の
渦センサ。5. A vibrating tube which is inserted into the pressure chamber with a slight gap and has a pressure receiving plate having a recess and a flange for cantilever supporting the pressure receiving plate, and one end of which is coaxial with the vibrating tube in the recess. And a torque detector that is connected between the other end of the transmission shaft and the vibrating tube and that detects a torque acting on the pressure receiving plate via the transmission shaft. The vortex sensor according to claim 1 or 4, which is characterized.
とからなる振動管と、該振動管の凹部と同軸に一端が固
着され他端に接続部を有するトルクの伝達軸と、該伝達
軸の接続部に着脱自在に前記振動管に固着したトルク検
出手段とからなることを特徴とする請求項１記載の渦セ
ンサ。6. A vibrating tube including a pressure receiving plate having a recess and a mounting flange, a torque transmission shaft having one end fixed coaxially with the recess of the vibrating pipe and a connecting portion at the other end, and a connection of the transmission shaft. The vortex sensor according to claim 1, further comprising: a torque detecting unit that is detachably fixed to the vibration tube.
を有する受圧板および取付フランジとからなる振動管
と、一端に前記接続部と軸方向に着脱可能に接続する接
手を有する伝達軸と、該伝達軸の他端に固着され前記振
動管との間のトルクを検知するトルク検出手段とからな
ることを特徴とする請求項１記載の渦センサ。7. A transmission shaft having a pressure receiving plate having a concave portion and a connecting portion disposed in the concave portion and a mounting flange, and a transmission shaft having at one end a joint for detachably connecting to the connecting portion in the axial direction. 2. The vortex sensor according to claim 1, further comprising: a torque detection unit fixed to the other end of the transmission shaft to detect a torque between the vibration pipe and the vibration pipe.
端が固着された下部渦発生体と該下部渦発生体と同軸な
上部渦発生体と、該上部渦発生体と前記本体とを接続し
前記上部渦発生体に作用するカルマン渦によるトルクを
検知するトルク検出器とからなることを特徴とする渦流
量計。8. A main body through which a measurement fluid flows, a lower vortex generator whose one end is fixed in the main body, an upper vortex generator coaxial with the lower vortex generator, and the upper vortex generator and the main body. A vortex flowmeter, comprising a torque detector connected to the upper vortex generator to detect a torque caused by a Karman vortex.
がトルク検出器と同軸上となるように前記渦発生体他部
に穴を穿設したことを特徴とする請求項７記載の渦流量
計。9. The vortex generator other part is provided with a hole so that the center of gravity of the vortex generator other part is coaxial with the torque detector. 7. A vortex flowmeter according to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5167824A JP3049176B2 (en) | 1993-07-07 | 1993-07-07 | Vortex flowmeter and vortex sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5167824A JP3049176B2 (en) | 1993-07-07 | 1993-07-07 | Vortex flowmeter and vortex sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0719918A true JPH0719918A (en) | 1995-01-20 |
| JP3049176B2 JP3049176B2 (en) | 2000-06-05 |
Family
ID=15856779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5167824A Expired - Fee Related JP3049176B2 (en) | 1993-07-07 | 1993-07-07 | Vortex flowmeter and vortex sensor |
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| Country | Link |
|---|---|
| JP (1) | JP3049176B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2709430C1 (en) * | 2019-05-30 | 2019-12-17 | Закрытое акционерное общество "Электронные и механические измерительные системы" (ЗАО "ЭМИС") | Bending moment sensor for vortex flowmeters |
| RU2765898C2 (en) * | 2020-04-15 | 2022-02-04 | Общество с ограниченной ответственностью "СЭНСОПРИБОР" | Bending moment sensor for high-temperature vortex flowmeters |
| RU2766105C2 (en) * | 2020-04-15 | 2022-02-07 | Общество с ограниченной ответственностью «СЭНСОПРИБОР» | High-temperature bending moment sensor for vortex flowmeters |
| RU2771011C1 (en) * | 2021-08-26 | 2022-04-25 | Общество с ограниченной ответственностью "СЭНСОПРИБОР" | High temperature sensor for vortex flowmeters |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101513275B1 (en) * | 2014-02-11 | 2015-04-17 | 주식회사지식과상상 | Reel-brain playing and studying tool and mehtod |
-
1993
- 1993-07-07 JP JP5167824A patent/JP3049176B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2709430C1 (en) * | 2019-05-30 | 2019-12-17 | Закрытое акционерное общество "Электронные и механические измерительные системы" (ЗАО "ЭМИС") | Bending moment sensor for vortex flowmeters |
| RU2765898C2 (en) * | 2020-04-15 | 2022-02-04 | Общество с ограниченной ответственностью "СЭНСОПРИБОР" | Bending moment sensor for high-temperature vortex flowmeters |
| RU2766105C2 (en) * | 2020-04-15 | 2022-02-07 | Общество с ограниченной ответственностью «СЭНСОПРИБОР» | High-temperature bending moment sensor for vortex flowmeters |
| RU2771011C1 (en) * | 2021-08-26 | 2022-04-25 | Общество с ограниченной ответственностью "СЭНСОПРИБОР" | High temperature sensor for vortex flowmeters |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3049176B2 (en) | 2000-06-05 |
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