JPS6257206B2 - - Google Patents
Info
- Publication number
- JPS6257206B2 JPS6257206B2 JP57102674A JP10267482A JPS6257206B2 JP S6257206 B2 JPS6257206 B2 JP S6257206B2 JP 57102674 A JP57102674 A JP 57102674A JP 10267482 A JP10267482 A JP 10267482A JP S6257206 B2 JPS6257206 B2 JP S6257206B2
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- vortex
- span
- span band
- vibrator
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
- F02D41/185—Circuit arrangements for generating control signals by measuring intake air flow using a vortex flow sensor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
- F02M69/48—Arrangement of air sensors
-
- 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
- G01F1/3218—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 bluff body design
-
- 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
- G01F1/3259—Means for detecting quantities used as proxy variables for swirl for detecting fluid pressure oscillations
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
Description
本発明は流れの中に挿入した柱状物体の両側面
近傍に生じる渦の圧力変動によつて変位する振動
部材の変位振動数を検出して渦周波数を求めるよ
うにしたカルマン渦流量計、特に板状部材より成
る振動部材の振動特性を改良したカルマン渦流量
計に関する。
The present invention relates to a Karman vortex flowmeter that detects the displacement frequency of a vibrating member that is displaced by the pressure fluctuation of a vortex generated near both sides of a columnar object inserted into a flow to determine the vortex frequency. The present invention relates to a Karman vortex flowmeter with improved vibration characteristics of a vibrating member made of a shaped member.
この種のカルマン渦流量計としては、本件出願
人が提案（特願昭56−179071、特開昭58−80528
号公報）した次のようなものがある。
第１図はこのカルマン渦流量計の全体構成図、
第２図及び第３図は渦検出装置を示す概略図、第
４図は振動子の平面断面図、第５図はその検出波
形の一例を示す出力特性図である。
第１図において、１は管路、２はカルマン渦を
発生させるための一対の渦発生体、３１，３２は
この渦発生体２の両側面に設けた開口、４は渦検
出部、５は光フアイバ、６は渦検出信号の処理回
路である。第２図および第３図に示されるごと
く、渦検出部４には振動室７が形成されており、
この振動室７には、渦発生体２の近傍に発生した
渦によつて振動する振動子８が設けられている。
この振動子８は、第４図に示す如く、渦の圧力変
化が作用する振動板９とこの振動板９をその重心
を含む線対称な軸上で保持してねじり振動を行わ
せるための一対のスパンバンド１０１および１０
２と、このスパンバンド１０１，１０２の固定端
となる枠部１１とがほぼ一定の厚さの一枚の金属
板から成形されてなる。なお、１２１および１２
２は前記開口３１および３２にそれぞれ連通する
導圧孔で、渦の圧力変化を振動板９へ導くための
ものである。また、信号処理回路６は、発光素子
１３、受光素子１４および波形成形回路１５とよ
り構成される。
次に、第１図ないし第５図を参照して動作を説
明する。管路１の所定個所に取り付けられた渦発
生体２の両側面近傍にカルマン渦が発生すると、
この渦による圧力が開口３１、導圧孔１２１、ま
たは開口３２、導圧孔１２２を介して振動板９に
伝えられ、これによつて振動板９が変位する。こ
の渦は、渦発生体２の両側面近傍に交互に発生す
るので、この渦によつて振動板９は一対のスパン
バンド１０１および１０２の回りにねじり振動を
行う。この振動板９には、信号処理回路６の発光
素子１３からの光が光フアイバ５１を介して導入
され、この導入光は振動板９の表面で反射し、光
フアイバ５２を介して受光素子１４へ与えられ
る。なお、この受光素子１４への入射光量は、振
動板９の変位に応じて変化するので、振動板９の
一往復に対応した信号が得られ、これによつて渦
周波数を検出することができる。
As this type of Karman vortex flowmeter, the present applicant proposed
There are the following: Figure 1 shows the overall configuration of this Karman vortex flowmeter.
2 and 3 are schematic diagrams showing the vortex detection device, FIG. 4 is a plan sectional view of the vibrator, and FIG. 5 is an output characteristic diagram showing an example of the detected waveform. In FIG. 1, 1 is a pipe, 2 is a pair of vortex generators for generating Karman vortices, 31 and 32 are openings provided on both sides of this vortex generator 2, 4 is a vortex detector, and 5 is a vortex generator. The optical fiber 6 is a processing circuit for the eddy detection signal. As shown in FIGS. 2 and 3, a vibration chamber 7 is formed in the vortex detection section 4,
This vibration chamber 7 is provided with a vibrator 8 that vibrates due to the vortex generated near the vortex generator 2 .
As shown in FIG. 4, this vibrator 8 consists of a diaphragm 9 on which vortex pressure changes act, and a pair of diaphragms 9 for holding the diaphragm 9 on a line symmetrical axis including its center of gravity to cause torsional vibration. span bands 101 and 10 of
2 and the frame portion 11 that serves as the fixed end of the span bands 101, 102 are formed from a single metal plate having a substantially constant thickness. In addition, 121 and 12
Reference numeral 2 denotes pressure guiding holes communicating with the openings 31 and 32, respectively, for guiding pressure changes of the vortex to the diaphragm 9. Further, the signal processing circuit 6 includes a light emitting element 13, a light receiving element 14, and a waveform shaping circuit 15. Next, the operation will be explained with reference to FIGS. 1 to 5. When a Karman vortex is generated near both sides of the vortex generator 2 attached to a predetermined location of the pipe line 1,
The pressure caused by this vortex is transmitted to the diaphragm 9 via the opening 31, the pressure guiding hole 121, or the opening 32, the pressure guiding hole 122, thereby displacing the diaphragm 9. These vortices are generated alternately in the vicinity of both side surfaces of the vortex generator 2, so that the diaphragm 9 torsionally vibrates around the pair of span bands 101 and 102 due to these vortices. Light from the light emitting element 13 of the signal processing circuit 6 is introduced into the diaphragm 9 via an optical fiber 51, and this introduced light is reflected on the surface of the diaphragm 9 and transmitted via the optical fiber 52 to the light receiving element 14. given to. Note that since the amount of light incident on the light receiving element 14 changes according to the displacement of the diaphragm 9, a signal corresponding to one round trip of the diaphragm 9 is obtained, and the vortex frequency can be detected by this. .
定常状態において受光素子１４によつて検出さ
れる信号は、例えば第５図Ａに示すように、振動
板の静止時の平衡位置に対応した一定の直流成分
にほぼ対称な波形となる。しかし、流量が低流量
から高流量に流量が急変する過渡状態では前記振
動子８の振動板９の質量とスパンバンド１０１お
よび１０２のねじりバネ定数で決まる固有振動数
で共振を生じ、例えば第５図Ａに示すように流量
が変化する過渡時に波形が乱れ、渦を検出できな
くなる欠点があつた。なお、第７図において、特
性線Ａで示すように、この場合には、振動子のね
じり振動の周波数特性には共振点が存在してい
る。
本発明は簡単な方法でしかも過渡時にも確実に
渦を検出できるようにしたカルマン渦流量計を提
供することを目的とする。
The signal detected by the light receiving element 14 in a steady state has a waveform that is approximately symmetrical to a constant DC component corresponding to the equilibrium position of the diaphragm when it is at rest, as shown in FIG. 5A, for example. However, in a transient state where the flow rate suddenly changes from a low flow rate to a high flow rate, resonance occurs at a natural frequency determined by the mass of the diaphragm 9 of the vibrator 8 and the torsional spring constants of the span bands 101 and 102. As shown in Figure A, the waveform is disturbed during transient periods when the flow rate changes, making it impossible to detect vortices. In this case, as shown by characteristic line A in FIG. 7, a resonance point exists in the frequency characteristic of the torsional vibration of the vibrator. SUMMARY OF THE INVENTION An object of the present invention is to provide a Karman vortex flowmeter that can detect vortices in a simple manner and reliably even during transient periods.
このような目的を達成するために、本発明は、
振動板を一枚の板状部材の所定部を所定形状に切
り落した残りの所定部分から形成すると共に、そ
の板状部材にはさらに前記振動板を支持する一対
のスパンバンド部と、このスパンバンド部を支持
する枠部とを形成し、かつ前記スパンバンド部に
よつて前記振動板の回転軸を形成し、このように
構成された振動板、スパンバンド部および枠部か
ら成る振動子を、流体の管路の外に配置された振
動室内に、前記枠部がその振動室に固定されるよ
うにして収納し、しかも、前記スパンバンド部に
張力を付与する張力付与手段を設け、さらに、前
記スパンバンド部にダンピングを加えるダンピン
グ材を設けたことを特徴とする。
In order to achieve such an objective, the present invention
A diaphragm is formed from a predetermined portion of a plate-like member that is cut off into a predetermined shape, and the plate-like member further includes a pair of spun band portions that support the diaphragm, and the spun band. the diaphragm, the span band part and the frame part, and the span band part forms a rotation axis of the diaphragm, The frame portion is housed in a vibrating chamber disposed outside the fluid conduit so as to be fixed in the vibrating chamber, and tension applying means for applying tension to the span band portion is provided, and further, The present invention is characterized in that a damping material that applies damping is provided to the spun band portion.
以下、本発明の実施例を図面を参照して説明す
る。
第６図は本発明の一実施例を示す振動子の概略
図である。なお、渦検出部等の他の部分は第１図
または第２図及び第３図の如く構成され、ここに
は振動子のみが示されている。
第６図において、９，１０１および１０２は第
１図または第２図に示した振動板、スパンバンド
と同じである。１６はこのスパンバンド１０１，
１０２の表面に塗付したダンピング材で、例えば
ゴム質等の粘弾性体である。このようにスパンバ
ンド部分にダンピングを加えることにより、実験
の結果、この振動子のねじり振動の周波数特性
は、第７図において特性線Ｂで示す如く、共振点
がほぼなくなるので、過渡時でも完全に渦の圧力
変動に追ずいして振動するようになることが判明
した。さらに、第５図Ｂに示すように、本発明に
よれば、流量の変化する過渡時に波形が乱ること
がなくなり、従つて渦を検出できなくなるという
ことがなくなつた。このようにして、本発明にお
いては、振動子８は少なくとも渦周波数範囲内で
の共振が防止される。
第８は他の実施例を示す概略図である。この例
で第７図と異なる点は、振動子８のスパンバンド
１０１および１０２にダンピング材を塗付する代
わりに、このスパンバンド１０１，１０２を収納
する渦検出部４に設けたスパンバンドの収納室１
７１および１７２内全てにダンピング材１８を充
填するよう構成した点にある。このような構成に
よれば、振動子の捩り振動の共振を押えることが
できる他、振動子の垂直および水平方向へのたわ
み振動をも防止することができ、外部振動の影響
を無くすことができる利点がある。なお、この実
施例においては、ダンピング材１８としてはたと
えばシリコンゴムを使用することができる。
なお、このダンピングを加える構成は、本実施
例に限るものではなく、いくつかの方法を並用し
ても良く、振動子のねじり振動の共振を防止でき
れば良い。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 is a schematic diagram of a vibrator showing an embodiment of the present invention. Note that other parts such as the vortex detection section are constructed as shown in FIG. 1, FIG. 2, and FIG. 3, and only the vibrator is shown here. In FIG. 6, 9, 101 and 102 are the same as the diaphragm and span band shown in FIG. 1 or 2. 16 is this span band 101,
A damping material applied to the surface of 102, for example, a viscoelastic material such as rubber. As a result of experiments, by adding damping to the span band portion, the frequency characteristics of the torsional vibration of this vibrator almost eliminates resonance points, as shown by characteristic line B in Figure 7, so that it becomes perfect even during transients. It was found that the vortex began to vibrate in response to the pressure fluctuations in the vortex. Furthermore, as shown in FIG. 5B, according to the present invention, the waveform is no longer disturbed during transient changes in the flow rate, and therefore no vortices can be detected. In this way, according to the invention, the vibrator 8 is prevented from resonating at least within the vortex frequency range. The eighth is a schematic diagram showing another embodiment. The difference in this example from FIG. 7 is that instead of applying a damping material to the span bands 101 and 102 of the vibrator 8, the span bands are housed in the vortex detection section 4 that accommodates the span bands 101 and 102. Room 1
The damping material 18 is configured to fill all of the insides of the damping material 71 and 172. With this configuration, not only can resonance of torsional vibration of the vibrator be suppressed, but also deflective vibration of the vibrator in the vertical and horizontal directions can be prevented, and the influence of external vibration can be eliminated. There are advantages. In this embodiment, silicone rubber, for example, can be used as the damping material 18. Note that the configuration for adding this damping is not limited to this embodiment, and several methods may be used in parallel, as long as resonance of torsional vibration of the vibrator can be prevented.
本発明によれば、渦の圧力でスパンバンドで保
持した振動部材からなる振動子を振動させる際こ
のスパンバンドに減衰を付加したので、流量急変
時でも渦周波と振動子の共振周波数との干渉が無
くなり、過渡時の流量変化を精度良く計測でき、
実用上有効である。また、このスパンバンドの収
納室内を完全にダンピング材で充テンして減衰を
付加したので、スパンバンドのたわみ振動をも押
えることができ、外部振動の影響を一そう少さく
できる利点がある。
According to the present invention, when the vibrator made of a vibrating member held by a span band is vibrated by the pressure of the vortex, damping is added to the span band, so even when the flow rate changes suddenly, the vortex frequency and the resonance frequency of the vibrator will not interfere with each other. is eliminated, allowing accurate measurement of transient flow rate changes.
It is practically effective. In addition, since the storage chamber of the span band is completely filled with damping material to add damping, it is possible to suppress the deflection vibration of the span band, which has the advantage of further reducing the influence of external vibration.
第１図は本件出願人によつて提案されたカルマ
ン渦流量計の全体構成図、第２図および第３図は
その渦検出装置を示す概略図、第４図はその振動
子の平面断面図、第５図は流量計の出力信号特性
図、第６図は本発明の一実施例の要部の概略平面
断面図、第７図は流量計の周波数特性図、第８図
は本発明の他の実施例の概略構成図である。
２……渦発生体、４……渦検出部、５……光フ
アイバ、６……信号処理回路、７……振動室、８
……振動子、９……振動板、１０１，１０２……
スパンバンド、１６，１８……ダンピング材。
Fig. 1 is an overall configuration diagram of the Karman vortex flowmeter proposed by the applicant, Figs. 2 and 3 are schematic diagrams showing its vortex detection device, and Fig. 4 is a plan cross-sectional view of its vibrator. , FIG. 5 is an output signal characteristic diagram of the flowmeter, FIG. 6 is a schematic cross-sectional plan view of the main part of an embodiment of the present invention, FIG. 7 is a frequency characteristic diagram of the flowmeter, and FIG. 8 is a diagram of the frequency characteristic of the flowmeter. It is a schematic block diagram of another Example. 2... Vortex generator, 4... Vortex detector, 5... Optical fiber, 6... Signal processing circuit, 7... Vibration chamber, 8
... Vibrator, 9 ... Vibration plate, 101, 102 ...
Spun band, 16, 18... damping material.
Claims (1)
体の両側面近傍に交互に生じる圧力変動を受けて
振動する振動板を備え、この振動板の振動周波数
から前記流体の流量を測定するカルマン渦流量計
において、 前記振動板９を一枚の板状部材の所定部を所定
形状に切り落した残りの所定部分から形成すると
共に、その板状部材にはさらに前記振動板を支持
する一対のスパンバンド部１０１，１０２と、こ
のスパンバンド部を支持する枠部１１とを形成
し、かつ前記スパンバンド部によつて前記振動板
の回転軸を形成し、 このように構成された振動板、スパンバンド部
および枠部から成る振動子８を、前記流体の管路
の外に配置された振動室７内に、前記枠部がその
振動室に固定されるようにして収納し、 しかも、前記スパンバンド部に張力を付与する
張力付与手段を設け、 さらに、前記スパンバンド部にダンピングを加
えるダンピング材を設けた、 ことを特徴とするカルマン渦流量計。[Claims] 1. A diaphragm that vibrates in response to pressure fluctuations that alternately occurs near both sides of a Karman vortex generator inserted into a fluid flow, and the vibration frequency of the diaphragm is used to determine the flow of the fluid. In a Karman vortex flowmeter for measuring flow rate, the diaphragm 9 is formed from a predetermined portion of a plate-shaped member that is cut off into a predetermined shape, and the diaphragm is further attached to the plate-shaped member. A pair of supporting span band parts 101 and 102 and a frame part 11 supporting the span band parts are formed, and the rotating shaft of the diaphragm is formed by the span band parts, and is configured in this way. A vibrator 8 consisting of a vibrating plate, a span band portion and a frame portion is housed in a vibrating chamber 7 disposed outside the fluid conduit such that the frame portion is fixed to the vibrating chamber. A Karman vortex flowmeter, further comprising: a tension applying means for applying tension to the span band portion; and a damping material for applying damping to the span band portion.
Priority Applications (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57102674A JPS58219414A (en) | 1982-06-15 | 1982-06-15 | Karman's vortex street flowmeter |
| US06/439,900 US4584883A (en) | 1981-11-10 | 1982-11-08 | Karman vortex flowmeter |
| GB08502843A GB2159946B (en) | 1981-11-10 | 1982-11-10 | Karmen vortex flowmeters |
| DE19823241988 DE3241988A1 (en) | 1981-11-10 | 1982-11-10 | FLOWMETER WITH KARMAN'SCHER VERBELSTRASSE |
| GB08232154A GB2112938B (en) | 1981-11-10 | 1982-11-10 | Karman vortex flowmeters |
| GB08502844A GB2160313B (en) | 1981-11-10 | 1985-02-05 | Karman vortex flowmeters |
| GB08502848A GB2160317B (en) | 1981-11-10 | 1985-02-05 | Karman vortex flowmeters |
| GB08502846A GB2160315B (en) | 1981-11-10 | 1985-02-05 | Karman vortex flowmeters |
| GB08502847A GB2160316B (en) | 1981-11-10 | 1985-02-05 | Karman vortex flowmeters |
| GB08502845A GB2160314B (en) | 1981-11-10 | 1985-02-05 | Karman vortex flowmeters |
| GB08502849A GB2160318B (en) | 1981-11-10 | 1985-02-05 | Karman vortex flowmeters |
| US06/823,998 US4648280A (en) | 1981-11-10 | 1986-01-29 | Karman vortex flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57102674A JPS58219414A (en) | 1982-06-15 | 1982-06-15 | Karman's vortex street flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58219414A JPS58219414A (en) | 1983-12-20 |
| JPS6257206B2 true JPS6257206B2 (en) | 1987-11-30 |
Family
ID=14333773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57102674A Granted JPS58219414A (en) | 1981-11-10 | 1982-06-15 | Karman's vortex street flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58219414A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61193024A (en) * | 1985-02-22 | 1986-08-27 | Fuji Electric Co Ltd | Karman vortex flow meter |
| JPS61176413U (en) * | 1985-04-23 | 1986-11-04 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5233976A (en) * | 1975-09-11 | 1977-03-15 | Yokohama Rubber Co Ltd | Device for adhering bead filler |
| JPS6136903Y2 (en) * | 1979-12-10 | 1986-10-25 |
-
1982
- 1982-06-15 JP JP57102674A patent/JPS58219414A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58219414A (en) | 1983-12-20 |
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