JPH0455250B2 - - Google Patents
Info
- Publication number
- JPH0455250B2 JPH0455250B2 JP12579085A JP12579085A JPH0455250B2 JP H0455250 B2 JPH0455250 B2 JP H0455250B2 JP 12579085 A JP12579085 A JP 12579085A JP 12579085 A JP12579085 A JP 12579085A JP H0455250 B2 JPH0455250 B2 JP H0455250B2
- Authority
- JP
- Japan
- Prior art keywords
- curved conduit
- conduit
- curved
- axis
- vibration
- 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
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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8431—Coriolis or gyroscopic mass flowmeters constructional details electronic circuits
-
- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
- G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
- G01F1/8472—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane
-
- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
- G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
- G01F1/8472—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane
- G01F1/8477—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane with multiple measuring conduits
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Description
【発明の詳細な説明】
１ 産業上の利用分野
本願発明はコリオリの力を利用した質量流量計
に関する。DETAILED DESCRIPTION OF THE INVENTION 1. Field of Industrial Application The present invention relates to a mass flowmeter that utilizes the Coriolis force.
２ 従来技術
流管を流れる流体流に対して振動を与えると、
流体流の流れの向きと流管の振動軸とに対して直
角方向にコリオリの力が発生し、このコリオリの
力は振動周波数と流体の質量流量とに比例するこ
とが知られており、特開昭54−52570号公報にお
いて開示されている。この従来例は支持部材に流
入口及び流出口をもつた湾曲導管を固着した本体
形状をもつており、流体は流入口より湾曲管を通
つて流出口より流出する。湾曲導管を導管面（導
管のつくる面）に対して垂直の方向に支持部固着
線（流入口と流出口とが支持されている支持部を
結んだ線）を軸とし振動を与えると湾曲導管を流
れる流体にコリオリの力が作用し、固着線に対し
て垂直な軸に関してコリオリの力に比例した捩じ
り振動が生ずる。このコリオリの力は湾曲導管の
各々の腕部が基準面を通過する時間差から求める
ようにしている。湾曲導管の加振方法は、固着線
を軸として、湾曲導管と同様の固有振動数を有す
る往復部材との間で各々反対位相で振動するよう
にしている。2. Prior Art When vibration is applied to a fluid flow flowing through a flow tube,
It is known that a Coriolis force is generated in a direction perpendicular to the direction of the fluid flow and the vibration axis of the flow tube, and that this Coriolis force is proportional to the vibration frequency and the mass flow rate of the fluid. It is disclosed in Japanese Patent Publication No. 54-52570. This conventional example has a body shape in which a curved conduit having an inlet and an outlet is fixed to a support member, and fluid flows from the inlet through the curved pipe and flows out from the outlet. When a curved conduit is vibrated in a direction perpendicular to the conduit surface (the surface on which the conduit is made) about the supporting part fixing line (the line connecting the support part where the inlet and outlet are supported) as the axis, the curved conduit becomes curved. A Coriolis force acts on the fluid flowing through it, producing torsional vibrations proportional to the Coriolis force about an axis perpendicular to the anchor line. This Coriolis force is determined from the time difference between each arm of the curved conduit passing through the reference plane. The method of vibrating the curved conduit is to vibrate the curved conduit and a reciprocating member having the same natural frequency as the curved conduit with opposite phases about the fixed wire as an axis.
３ 発明が解決しようとする問題点
上述の従来例はコリオリの力を湾曲導管の捩じ
り量として検出するものであり、そのために湾曲
導管は導管面に垂直方向の振動が加えられるが、
加振エネルギを小さくするために、湾曲導管の加
振部から支持部材までの間の腕長さを大きくする
必要がある。従つて外部振動の影響を受け易く、
また往復動部材を付加することは、計測流体の相
違による密度差等により実質的な固有振動数が変
化するにも拘わらず、上記往復動部材の固有振動
数は固定値である等の問題点があつた。3 Problems to be Solved by the Invention The above-mentioned conventional example detects the Coriolis force as the amount of twist of the curved conduit, and as a result, vertical vibrations are applied to the conduit surface of the curved conduit.
In order to reduce the excitation energy, it is necessary to increase the arm length between the excitation part of the curved conduit and the support member. Therefore, it is susceptible to external vibrations,
Additionally, adding a reciprocating member has problems such as the fact that the natural frequency of the reciprocating member is a fixed value, even though the actual natural frequency changes due to density differences due to differences in the fluid to be measured. It was hot.
４ 問題解決の手段
本願発明は、叙上の問題点を解決するため、加
振軸を湾曲導管の固着線に対して垂直な対称軸に
選らび、外部振動に対して安定な捩じり振動を与
えるようにし、この捩じり振動による湾曲導管の
振幅を流量の大きさ如何にかかわらず常に一定に
制御することによりこの制御量がコリオリの力の
大きさ即ち質量流量に比例することを利用して、
簡単で安定な質量流量計を提供するものである。4. Means for solving the problem In order to solve the above problems, the present invention selects the excitation axis as a symmetry axis perpendicular to the fixed line of the curved conduit, and generates torsional vibration that is stable against external vibration. By controlling the amplitude of the curved conduit caused by this torsional vibration to be constant regardless of the flow rate, we take advantage of the fact that this controlled amount is proportional to the magnitude of the Coriolis force, that is, the mass flow rate. do,
The present invention provides a simple and stable mass flow meter.
５ 実施例
第１図は本願発明の説明図である。湾曲導管１
は第１の軸XX′に関して対称な湾曲した管体であ
り、計測流体の流入口２と流出口３とが開口し、
該開口近傍で支持部材４に貫通されて固着されて
いる。支持部材４は湾曲導管１を支持するもので
固着部Ａ，Ｂを結んだ線YY′でしめされる第２の
軸のまわりに湾曲導管１が回転可能となつてい
る。湾曲導管の固着部Ａ，Ｂより等間隔の位置
Ｃ，Ｄ点に各々磁石５１，６１が固着されてい
る。この磁石５１及び６１と対向して電磁コイル
５（コイル）および６（コイル）が各々図示
しない静止面に固設されている。該電磁コイル
５，６は、後述する湾曲導管１の第１の軸XX′ま
わりの固有振動数に等しい周波数の位相が180°異
なる交流電流により励磁され、磁石５１および６
１に対する吸引、反撥を繰返す。交流電流が各々
180°異なるので磁石５１が吸引されるときは磁石
６１が反撥し、このため湾曲導管１は第１の軸
XX′のまわりに固有振動数ωで捩れ振動する。5 Embodiment FIG. 1 is an explanatory diagram of the present invention. Curved conduit 1
is a curved tube symmetrical about the first axis XX', and the inlet 2 and outlet 3 of the measurement fluid are open,
It is penetrated and fixed to the support member 4 near the opening. The support member 4 supports the curved conduit 1, and allows the curved conduit 1 to rotate around a second axis indicated by a line YY' connecting the fixed parts A and B. Magnets 51 and 61 are fixed at positions C and D, which are equally spaced from the fixed parts A and B of the curved conduit, respectively. Opposing the magnets 51 and 61, electromagnetic coils 5 (coils) and 6 (coils) are each fixedly installed on a stationary surface (not shown). The electromagnetic coils 5 and 6 are excited by an alternating current having a frequency equal to the natural frequency around the first axis XX' of the curved conduit 1 and having a phase difference of 180°, which will be described later.
Repeat attraction and repulsion for 1. Each alternating current
Since the difference is 180 degrees, when the magnet 51 is attracted, the magnet 61 is repelled, and therefore the curved conduit 1 is aligned with the first axis.
It torsionally vibrates around XX′ with natural frequency ω.
今第１の軸XX′のまわりの回転が矢印ωの方向
である場合、流体の質量流量に比例するコリオリ
の力がＺ方向に生ずる。一方の方向の場合のコ
リオリの力は−Ｚの方向に生ずる。即ち第１の軸
まわりの回転振動が一周期の場合、湾曲導管１の
XX′軸上の点Ｐは１往復する。即ち固有振動数を
もつて上下振動する。流体の静止時のＣ点及びＤ
点の振幅に対してコリオリの力による上下振動に
よる振幅が加算される。この振幅は差動変圧器の
如き振幅検出器７−１，７−２からの同相分の信
号を抽出することによつて検出される。差動変圧
器でない光などの検出でもよく電磁的な速度変換
形の検出器でもよい。この振幅検出器７の信号は
第３図の位相回転１０１、増幅器１０３を介して
電磁コイル５と180°移相する移相回路１０２で
移相されて電磁コイル６とが励磁されるように
帰還されて制御される。一方振幅信号増幅出力は
整流器１０４で整流され増幅器１０３に負帰還さ
れ、振幅一定に制御される。この制御量は指示計
１０５で指示される。この指示量はコリオリの
力、即ち質量流量を指示する。 If the rotation about the first axis XX' is now in the direction of the arrow ω, a Coriolis force proportional to the mass flow rate of the fluid occurs in the Z direction. The Coriolis force in one direction occurs in the -Z direction. In other words, when the rotational vibration around the first axis is one cycle, the curved conduit 1
Point P on the XX' axis makes one reciprocation. That is, it vibrates vertically with its natural frequency. Point C and D when the fluid is at rest
The amplitude due to vertical vibration due to Coriolis force is added to the amplitude of the point. This amplitude is detected by extracting the in-phase signal from amplitude detectors 7-1, 7-2 such as differential transformers. Detection of light, etc. other than a differential transformer may be used, and an electromagnetic speed conversion type detector may be used. The signal from the amplitude detector 7 is passed through a phase rotation 101 and an amplifier 103 in FIG. controlled. On the other hand, the amplitude signal amplification output is rectified by the rectifier 104 and fed back negatively to the amplifier 103, so that the amplitude is controlled to be constant. This control amount is indicated by an indicator 105. This indicated quantity indicates the Coriolis force, ie, the mass flow rate.
第２図は本願発明の他の実施例をしめす説明図
で上述の湾曲導管１と同形等大の湾曲導管２００
が導管面を平行して設置され、流管８に各々開口
固着される。湾曲導管１，２００の各々固着点
A1B1およびA2B2は第２の軸Y1Y1′及びY2Y2′を
形成し、湾曲導管１，２００を当該軸を中心に回
転可能にする。流管８内は仕切板９，１０によつ
て湾曲導管１，２００の各々に等流量分量するよ
うに仕切られる。第１図の場合と同様に磁石５
１，６１は各々湾曲導管１のC1，D1点に固着さ
れる。電磁コイル５，６はC1，D1点と対応する
湾曲導管２００のC2，D2の位置に固着される。
これら電磁コイルの励磁電流は180°位相が相違す
る。湾曲導管１，２００に矢印方向の流れがある
場合、湾曲導管１と２００との捩じり振動は、
C1，C2点で吸引、D1，D2で反撥の場合、湾曲導
管１はX1X1′の第１の軸に関してω、湾曲導管２
００ではの回転となる。この振動によるコリオ
リの力は、湾曲導管１においてＺ方向、湾曲導管
２００において−Ｚ方向の変位によりお互いが離
間する。反対の振動の場合は吸引する。この変位
量は、第１図の単一導管の場合の２倍となりＳ／
Ｎ比が向上する。この変位は捩じり振動による変
位に加算されるので、この変位は振幅検出器７−
１，７−２により同相分の信号を抽出することに
よつて検出し、第１図の場合と同様に第３図の制
御方式により質量流量を指示することができる。 FIG. 2 is an explanatory diagram showing another embodiment of the present invention, in which a curved conduit 200 having the same shape and size as the above-mentioned curved conduit 1 is shown.
are installed parallel to the conduit surface, and are each fixed to the flow tube 8 through an opening. Each anchoring point of the curved conduit 1,200
A 1 B 1 and A 2 B 2 form second axes Y 1 Y 1 ' and Y 2 Y 2 ', about which the curved conduit 1,200 is rotatable. The inside of the flow tube 8 is partitioned by partition plates 9 and 10 so that an equal flow rate is distributed to each of the curved conduits 1 and 200. As in the case of Fig. 1, the magnet 5
1 and 61 are fixed to points C 1 and D 1 of the curved conduit 1, respectively. The electromagnetic coils 5 and 6 are fixed at positions C 2 and D 2 of the curved conduit 200 corresponding to points C 1 and D 1 .
The excitation currents of these electromagnetic coils have a phase difference of 180°. When there is a flow in the direction of the arrow in the curved conduits 1 and 200, the torsional vibration between the curved conduits 1 and 200 is as follows.
In the case of attraction at C 1 , C 2 points and repulsion at D 1 , D 2 , curved conduit 1 is ω with respect to the first axis of X 1 X 1 ′, curved conduit 2
The rotation is 00. The Coriolis force caused by this vibration causes the curved conduit 1 to be displaced in the Z direction, and the curved conduit 200 to be displaced in the -Z direction, thereby causing the curved conduit 200 to move away from each other. If the vibration is opposite, it will be attracted. This displacement is twice that of the single conduit shown in Figure 1, and S/
N ratio improves. This displacement is added to the displacement due to torsional vibration, so this displacement is detected by the amplitude detector 7-
1 and 7-2, the mass flow rate can be detected by extracting the in-phase signal, and the mass flow rate can be instructed by the control method shown in FIG. 3, as in the case of FIG.
第４図は本発明の更に他の実施例を示してお
り、いわば第１図図示実施例における振幅検出器
７−１，７−２を１つにまとめて、第１図図示Ｐ
点に配置したものに対応している。第１図図示Ｐ
点における振動成分には、上述の捩じり振動にも
とづく成分が実質上存在しない形となつている。
このために、第１図図示実施例の場合に振幅検出
器７−１と７−２との夫々の検出信号のうちの同
相成分を抽出していたが、このための信号処理が
不要となる。 FIG. 4 shows still another embodiment of the present invention, in which the amplitude detectors 7-1 and 7-2 in the embodiment shown in FIG.
It corresponds to those placed at points. Figure 1: P
The vibration component at the point is substantially free of the component based on the above-mentioned torsional vibration.
For this purpose, the in-phase components of the respective detection signals of the amplitude detectors 7-1 and 7-2 were extracted in the case of the embodiment shown in FIG. 1, but signal processing for this purpose is no longer necessary. .
第５図は、第４図図示の本体の駆動と指示との
原理を示すブロツク図であつて、第３図図示と同
じ機能をはたしている。第５図図示の場合には
光・抵抗変換素子２０６を用い、上記Ｐ点の振動
が一定振幅となるように制御されている状態で指
示計２０７による指示が読取られる。 FIG. 5 is a block diagram showing the principle of driving and directing the main body shown in FIG. 4, and has the same function as that shown in FIG. 3. In the case shown in FIG. 5, a light/resistance conversion element 206 is used to read an instruction from an indicator 207 while the vibration at the point P is controlled to have a constant amplitude.
６ 効果
叙上の如く本願発明によれば、外部振動に対し
て影響を受け難い捩じり駆動するためＳ／Ｎ比が
優れ、更に零位法による計測となるため高精度の
質量流量計を最も単純な形状構成で安価に提供す
ることができる。6. Effects As described above, according to the present invention, the S/N ratio is excellent due to the torsional drive which is not easily affected by external vibrations, and furthermore, since the measurement is performed using the zero position method, it is possible to use a high-precision mass flowmeter. It can be provided at low cost with the simplest configuration.
第１図は本願発明の実施例、第２図および第４
図は夫々他の実施例、第３図は第１図および第２
図図示の本体の駆動と指示との原理を示すブロツ
ク図、第５図は第４図図示の本体の駆動と指示と
の原理を示すブロツク図である。
図中、１，２００は湾曲導管、２，２０２は流
入口、３，２０３は流出口、５，５１，６，６１
は加振装置、７，７−１，７−２は振幅検出器を
表す。
Figure 1 shows an embodiment of the present invention, Figures 2 and 4.
The figures show other embodiments, and Figure 3 shows Figures 1 and 2.
FIG. 5 is a block diagram showing the principle of driving and directing the main body shown in FIG. 4. FIG. 5 is a block diagram showing the principle of driving and directing the main body shown in FIG. In the figure, 1,200 is a curved conduit, 2,202 is an inlet, 3,203 is an outlet, 5, 51, 6, 61
represents a vibration device, and 7, 7-1, and 7-2 represent amplitude detectors.
Claims (1)
開口部をもつ可撓性の湾曲導管と、該湾曲導管の
開口部近傍で該湾曲導管を固着しかつ当該固着部
を結ぶ第２の軸のまわりに湾曲導管を回転可能に
支持する支持部材とを有する本体部をそなえると
共に、第１の軸のまわりに上記湾曲導管に捩じり
交番振動を与える加振手段と、交番振動による湾
曲導管の上記第２の軸のまわりの振動の振幅を検
出する変位検出器と、該変位検出器の出力を一定
とする制御手段と、該制御手段の制御量を指示す
る指示部とをそなえることを特徴とする質量流量
計。 ２ 上記湾曲導管は、第１の湾曲導管と、該第１
の湾曲導管に対して同形等大の第２の湾曲導管と
を導管面が平行するように配置されて構成されて
なることを特徴とする特許請求の範囲第１項記載
の質量流量計。[Scope of Claims] 1. A flexible curved conduit that is symmetrical about a first axis and has two openings at symmetrical positions, and a flexible curved conduit that is fixed near the opening of the curved conduit and the fixed fixation. and a support member rotatably supporting the curved conduit around a second axis connecting the parts, and an excitation means for applying torsional alternating vibration to the curved conduit around the first axis. a displacement detector for detecting the amplitude of vibration of the curved conduit around the second axis due to alternating vibration; a control means for keeping the output of the displacement detector constant; and a control amount for instructing the control means. A mass flowmeter characterized by comprising an indicator section. 2 The curved conduit includes a first curved conduit and a first curved conduit.
2. The mass flowmeter according to claim 1, wherein a second curved conduit having the same shape and size is arranged so that the conduit surfaces thereof are parallel to the curved conduit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12579085A JPS61283827A (en) | 1985-06-10 | 1985-06-10 | Mass flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12579085A JPS61283827A (en) | 1985-06-10 | 1985-06-10 | Mass flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61283827A JPS61283827A (en) | 1986-12-13 |
| JPH0455250B2 true JPH0455250B2 (en) | 1992-09-02 |
Family
ID=14918929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12579085A Granted JPS61283827A (en) | 1985-06-10 | 1985-06-10 | Mass flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61283827A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010058617A1 (en) | 2008-11-18 | 2010-05-27 | 株式会社オーバル | Coriolis flowmeter |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8705758D0 (en) * | 1987-03-11 | 1987-04-15 | Schlumberger Electronics Uk | Mass flow measurement |
| JPH0749981B2 (en) * | 1987-11-20 | 1995-05-31 | トキコ株式会社 | Vibration measuring device |
| JP2005207836A (en) * | 2004-01-21 | 2005-08-04 | Oval Corp | S-shaped tube coriolis flowmeter |
| JP2024178860A (en) * | 2023-06-13 | 2024-12-25 | 横河電機株式会社 | Coriolis Mass Flow Meter |
-
1985
- 1985-06-10 JP JP12579085A patent/JPS61283827A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010058617A1 (en) | 2008-11-18 | 2010-05-27 | 株式会社オーバル | Coriolis flowmeter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61283827A (en) | 1986-12-13 |
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