JPH0436408Y2 - - Google Patents
Info
- Publication number
- JPH0436408Y2 JPH0436408Y2 JP12312186U JP12312186U JPH0436408Y2 JP H0436408 Y2 JPH0436408 Y2 JP H0436408Y2 JP 12312186 U JP12312186 U JP 12312186U JP 12312186 U JP12312186 U JP 12312186U JP H0436408 Y2 JPH0436408 Y2 JP H0436408Y2
- Authority
- JP
- Japan
- Prior art keywords
- flowmeter
- frequency
- conduit
- vibration
- elastic member
- 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
- 239000012530 fluid Substances 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Description
【考案の詳細な説明】
技術分野
本考案は、流量計装置、より詳細には、導管を
流通する流体に作用するコリオリの力を測定して
質量流量を求めるコリオリ式質量流量計の取付装
置に関する。[Detailed Description of the Invention] Technical Field The present invention relates to a flowmeter device, and more particularly, to a mounting device for a Coriolis mass flowmeter that measures the Coriolis force acting on a fluid flowing through a conduit to determine a mass flow rate. .
従来技術
導管を流れる流体流に対して振動を与えると、
流体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
が振動周波数と流体の質量流量に比例することが
知られており、特開昭54−52570号公報において、
前述のごときコリオリの力を利用した質量流量計
が開示されている。この流量計は、第４図Ａ，Ｂ
にしめすようにＵ字形の導管１を軸XX′に対称に
支持部材２で固着支持するとともに、軸XX′方向
に延びる往復動部材３の一端が支持部材２に固着
されている。この往復動部材３の他端には、導管
１の固着点を結ぶ軸YY′回りの導管１の固有振動
数と実質的に等しい振動数で加振する電磁コイル
４が配設されている。この電磁コイル４の軸上に
磁石５が導管１に保持板６を介して装着されてお
り、図示しない駆動源によりZZ′方向に吸引反発
され、この結果、導管１は軸YY′の回りに駆動さ
れる。これによりＱ方向に流れる流体に対してコ
リオリの力が作用し、XX′軸まわりに回転力が生
ずる。これを導管１の両腕に対称的に固設された
遮光板８により遮光される光検出器７における光
量変化から、導管１の両腕が中立面を通過する時
間差を出し、これからコリオリの力を求めてい
る。Prior Art When vibration is applied to a fluid flow flowing through a conduit,
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. In Publication No. 54-52570,
A mass flow meter utilizing the Coriolis force as described above is disclosed. This flowmeter is shown in Figure 4 A and B.
As shown, a U-shaped conduit 1 is fixedly supported by a support member 2 symmetrically about the axis XX', and one end of a reciprocating member 3 extending in the direction of the axis XX' is fixed to the support member 2. At the other end of the reciprocating member 3, an electromagnetic coil 4 is arranged which vibrates at a frequency substantially equal to the natural frequency of the conduit 1 around an axis YY' connecting the fixed points of the conduit 1. A magnet 5 is attached to the conduit 1 via a holding plate 6 on the axis of the electromagnetic coil 4, and is attracted and repelled in the ZZ' direction by a driving source (not shown).As a result, the conduit 1 rotates around the axis YY'. Driven. As a result, a Coriolis force acts on the fluid flowing in the Q direction, and a rotational force is generated around the XX' axis. From the change in the amount of light at the photodetector 7, which is blocked by a light shielding plate 8 fixed symmetrically to both arms of the conduit 1, the time difference between the two arms of the conduit 1 passing through the neutral plane is calculated, and from this, the Coriolis Seeking power.
従来技術の問題点
上述のコリオリ式質量流量計（以下単に流量計
と呼ぶ）は、加振の効率化を計るために導管１の
YY′軸まわりの固有振動数で該導管を駆動してい
るが、コリオリの力によるXX′軸まわりの発生ト
ルクは小さく、このトルクによる導管静止面から
の振動変位も小さく、導管駆動振幅に比し無視さ
れる程の大きさである。振動のエネルギーは周波
数の２乗に比例するが一定の周波数では振幅に比
例する。従つて、コリオリの力によるエネルギー
は、駆動エネルギーに対して極めて小さい値とな
り、それだけ外乱に弱く、誤差を生じ易い。外乱
としては流量計を配設した場合、流量計を接続す
る配管から受ける外部振動と近接して配置される
他の流量計から流量計取付の基礎を介して伝達さ
れる流量計固有振動がある。特に、他の流量計の
固有振動数が等しいか近接している場合、微弱な
コリオリの力に他の流量計の駆動振動が加算さ
れ、その結果、この外乱による誤差は無視できな
くなる問題点があつた。Problems with the prior art The above-mentioned Coriolis mass flowmeter (hereinafter simply referred to as a flowmeter) has a
The conduit is driven at its natural frequency around the YY' axis, but the torque generated around the XX' axis due to Coriolis force is small, and the vibration displacement from the stationary surface of the conduit due to this torque is also small, compared to the conduit drive amplitude. It is so large that it can be ignored. The energy of vibration is proportional to the square of the frequency, but at a certain frequency it is proportional to the amplitude. Therefore, the energy due to the Coriolis force has an extremely small value compared to the driving energy, and is therefore more susceptible to disturbances and more likely to cause errors. When a flowmeter is installed, external disturbances include external vibrations received from the pipes connecting the flowmeter and natural vibrations of the flowmeter transmitted from other flowmeters placed nearby via the flowmeter installation foundation. . In particular, when the natural frequencies of other flowmeters are the same or close to each other, the drive vibration of the other flowmeters is added to the weak Coriolis force, and as a result, the error caused by this disturbance becomes impossible to ignore. It was hot.
問題点解決の手段
本考案は、上述の問題点を解決するためになさ
れたもので、流量計を設置する取付台の質量を増
すとともに、この取付台を弾性部材で支持し、こ
の弾性部材のバネ定数と前記取付台とで直列共振
系を形成し、この直列共振系の共振周波数を流量
計固有振動数に対しての周波数比を限定すること
により外乱の影響を取り除くものである。Means for Solving the Problems The present invention has been made to solve the above-mentioned problems.It increases the mass of the mount on which the flowmeter is installed, supports this mount with an elastic member, and increases the mass of the mount on which the flowmeter is installed. A series resonance system is formed by the spring constant and the mounting base, and the influence of disturbances is removed by limiting the frequency ratio of the resonance frequency of this series resonance system to the natural frequency of the flowmeter.
実施例
第１図は、本考案の一実施例を説明するための
図で、Ａは平面図、Ｂは正面図で、１０は第４図
に示したコリオリ式流量計を外筐に内装した流量
計で、流入口１０１、流出口１０２が露出してあ
り、図示しない流管と接合されて使用される。流
量計１０は固定部１１において、固定ボルト１２
により後述する定められた重量をもつた平板状の
取付台１３に固設される。取付台１３は定められ
たバネ定数をもつたつる巻きばね又は防振ゴム等
からなる弾性部材１４により、図示しない基礎に
弾性部材１４に固着された固定片１７の固定孔１
８でボルト等で配設される。また、取付台１３と
弾性部材１４とはワツシヤ１５を介して固着手段
のボルト，ナツト１６により螺着される。第４図
に関して説明したように、流量計１０自体は振動
手段を内蔵しているが、この流量計１０に基礎を
通じて外部振動が伝達され、該流量計１０は該流
量計１０の固有振動数と等しい外部振動の影響を
大きく受ける。Embodiment Fig. 1 is a diagram for explaining an embodiment of the present invention, where A is a plan view, B is a front view, and 10 is a Coriolis flowmeter shown in Fig. 4 inside the outer casing. The flowmeter has an exposed inlet 101 and an outlet 102, and is used by being connected to a flow tube (not shown). The flow meter 10 has a fixing bolt 12 in a fixing part 11.
It is fixedly mounted on a flat plate-shaped mounting base 13 having a predetermined weight, which will be described later. The mounting base 13 has a fixing hole 1 of a fixing piece 17 fixed to the elastic member 14 on a foundation (not shown) by an elastic member 14 made of a helical spring having a predetermined spring constant, vibration-proof rubber, or the like.
8 and is installed with bolts etc. Further, the mounting base 13 and the elastic member 14 are screwed together with bolts and nuts 16 as fixing means via washers 15. As explained with reference to FIG. 4, the flowmeter 10 itself has built-in vibration means, but external vibrations are transmitted to this flowmeter 10 through the foundation, and the flowmeter 10 has a natural frequency of vibration. Significantly affected by equal external vibrations.
第１図の流量計装置は、流量計１０と取付台１
３その他を含む重量Ｗと弾性部材１４のバネ定数
Ｋとの振動方程式を満足する運動をするが、この
振動系で流量計１０に静的に強制外力を加えたと
き弾性部材１４はバネ定数Ｋに比例してたわみ、
このようなたわみをもたらす強制外力と加振力で
ある外力との比が振動伝達率をあらわすもので、
外部振動が流量計１０にどれだけ伝達されるかを
しめす。振動伝達率は外部振動数ｆと流量計装置
の固有振動数f0との比（振動数比）の関係であら
わされる。第３図は、上記振動伝達率と振動数比
の関係を示す図で、振動伝達率は流量計装置の固
有振動数f0の√２倍のとき１となる。実験による
と外部振動数ｆを流量計の固有振動数である駆動
振動数として、ｆを計量装置の固有振動数f0の２
倍以上即ち振動数比を２以上とした場合、流量計
は外部振動の影響は受けず、正しい計測結果が得
られた。逆に言えば、流量計装置の固有振動数を
流量計の固有振動数の1/2以下にすることである。
流量計装置の固有振動数f0は、
（ｇ：重力の加速度）
で求められるから、取付台１３の重量Ｗおよび弾
性部材１４の並列ばね定数Kpを(1)式を満足する
ように選択すればよい。 The flowmeter device shown in Fig. 1 consists of a flowmeter 10 and a mounting base 1.
3.The elastic member 14 moves to satisfy the vibration equation of the weight W including the others and the spring constant K of the elastic member 14, but when a forced external force is statically applied to the flow meter 10 in this vibration system, the elastic member 14 has a spring constant K. Deflection proportional to,
The ratio of the forced external force that causes this deflection to the external force that is the excitation force represents the vibration transmission rate.
It shows how much external vibration is transmitted to the flowmeter 10. The vibration transmissibility is expressed by the relationship between the external frequency f and the natural frequency f 0 of the flow meter device (frequency ratio). FIG. 3 is a diagram showing the relationship between the vibration transmission rate and the frequency ratio, and the vibration transmission rate is 1 when it is √2 times the natural frequency f 0 of the flow meter device. According to experiments, the external frequency f is the driving frequency, which is the natural frequency of the flowmeter, and f is the natural frequency f 0 of the metering device.
When the frequency ratio was 2 or more, that is, when the frequency ratio was 2 or more, the flowmeter was not affected by external vibration and accurate measurement results were obtained. In other words, the natural frequency of the flowmeter device should be less than 1/2 of the natural frequency of the flowmeter.
The natural frequency f 0 of the flowmeter device is (g: acceleration of gravity) Therefore, the weight W of the mounting base 13 and the parallel spring constant Kp of the elastic member 14 can be selected so as to satisfy equation (1).
第２図は、流量計１０をQ1〜QNのＮ台設置し
た場合を示したもので、第１図と同一の構成要素
は第１図の場合と同一の参照番号を付している
が、このようなＮ台の設置においても流量計Q1
〜QNの固有振動数を、各流量計の計測流量範囲
が異なる場合でもすべてほぼ等しい振動数ｆと
し、これと取付台１３１と流量計Q1〜QNとその
他部材とを含む重量Ｗ×Ｎ及び弾性部材１４の並
列ばね定数Kpからなる固有振動数fONとの振動数
比を２以上としたとき、相互流量計Q1〜QN間の
振動の干渉は全くなくなる。 Figure 2 shows a case where N flowmeters 10 are installed, Q 1 to Q N , and the same components as in Figure 1 are given the same reference numbers as in Figure 1. However, even in such an installation of N units, the flowmeter Q 1
The natural frequency of ~Q N is assumed to be the almost same frequency f even if the measured flow rate range of each flowmeter is different, and the weight W including this, the mounting base 131, the flowmeter Q 1 ~Q N , and other parts x When the frequency ratio with the natural frequency f ON consisting of the parallel spring constant Kp of the elastic member 14 and the parallel spring constant Kp of the elastic member 14 is set to 2 or more, there is no interference of vibration between the mutual flowmeters Q 1 to Q N.
効 果
上述のように、本考案によると、流量計単独で
も外部振動による流量計精度の悪化はみられず正
確な計測結果が得られ、多数の異なる仕様の流量
計を配設する場合でも、これらの流量計のコリオ
リ駆動の固有振動数を等しくして共通の取付台に
すべての流量計を配設できるので、設置場所も小
さくなり、各々の流量計を剛体上に固設すること
により相互干渉をなくすというような費用も不要
となり安価に設備される。Effects As mentioned above, according to the present invention, accurate measurement results can be obtained even when the flowmeter is used alone without deterioration of flowmeter accuracy due to external vibration, and even when a large number of flowmeters with different specifications are installed. Since the natural frequencies of the Coriolis drive of these flowmeters are made equal and all the flowmeters can be installed on a common mounting base, the installation space is also reduced, and by fixing each flowmeter on a rigid body, it is possible to There is no need to pay for eliminating interference, and the equipment can be installed at low cost.
第１図は、本考案の流量計装置を示す図でＡは
平面図、Ｂは正面図、第２図は、多数の流量計
Q1〜QNを配設した本考案の流量計装置で、Ａは
平面図、Ｂは正面図、第３図は、振動数比と振動
伝達率比との関係をしめす説明図、第４図は、コ
リオリ流量計の説明図である。
１０……流量計、１３……取付台、１４……弾
性部材。
Fig. 1 is a diagram showing the flowmeter device of the present invention, A is a plan view, B is a front view, and Fig. 2 is a diagram showing a large number of flowmeters.
In the flowmeter device of the present invention in which Q 1 to Q N are arranged, A is a plan view, B is a front view, Fig. 3 is an explanatory diagram showing the relationship between the frequency ratio and the vibration transmissibility ratio, and Fig. 4 The figure is an explanatory diagram of a Coriolis flowmeter. 10...Flowmeter, 13...Mounting base, 14...Elastic member.
Claims (1)
これら支持点に挟まれた区間を該区間における
固有振動数で駆動し、前記支持点まわりの角速
度と質量流量とに比例するコリオリの力を測定
して質量流量を求める流量計において、該流量
計を弾性部材で支えられた取付台に固定し、流
量計と取付台との質量の和と弾性部材のバネ定
数との直列共振周波数を上記導管の２点間の固
有振動数の1/2以下とすることを特徴とする流
量計装置。 (2) 上記固有振動数をほぼ等しくして複数のコリ
オリ式質量流量計を前記取付台面に配設してな
ることを特徴とする実用新案登録請求の範囲第
１項記載の流量計装置。[Claims for Utility Model Registration] (1) Having support points at two points on a conduit through which fluid flows;
In a flowmeter that determines the mass flow rate by driving a section sandwiched between these support points at the natural frequency of the section and measuring the Coriolis force that is proportional to the angular velocity around the support points and the mass flow rate, the flowmeter is fixed to a mounting base supported by an elastic member, and the series resonance frequency of the sum of the masses of the flowmeter and the mounting base and the spring constant of the elastic member is set to 1/2 or less of the natural frequency between the two points of the conduit. A flowmeter device characterized by: (2) The flowmeter device according to claim 1, wherein a plurality of Coriolis mass flowmeters are arranged on the mounting surface with substantially equal natural frequencies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12312186U JPH0436408Y2 (en) | 1986-08-11 | 1986-08-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12312186U JPH0436408Y2 (en) | 1986-08-11 | 1986-08-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6329723U JPS6329723U (en) | 1988-02-26 |
| JPH0436408Y2 true JPH0436408Y2 (en) | 1992-08-27 |
Family
ID=31013934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12312186U Expired JPH0436408Y2 (en) | 1986-08-11 | 1986-08-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0436408Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2523865Y2 (en) * | 1990-06-20 | 1997-01-29 | オーバル機器工業株式会社 | Vibration-proof mass flowmeter |
| JPH072575Y2 (en) * | 1992-01-28 | 1995-01-25 | 理夫 新井 | Locking mechanism of shield in helmet |
-
1986
- 1986-08-11 JP JP12312186U patent/JPH0436408Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6329723U (en) | 1988-02-26 |
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