JPS59187222A - Vortex flow-meter - Google Patents
Vortex flow-meterInfo
- Publication number
- JPS59187222A JPS59187222A JP58060333A JP6033383A JPS59187222A JP S59187222 A JPS59187222 A JP S59187222A JP 58060333 A JP58060333 A JP 58060333A JP 6033383 A JP6033383 A JP 6033383A JP S59187222 A JPS59187222 A JP S59187222A
- Authority
- JP
- Japan
- Prior art keywords
- hollow body
- vortex
- hole
- karman
- holes
- 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
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
- G01F1/05—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
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
Abstract
Description
【発明の詳細な説明】
皮亙芳■
本発明は、流体中に配設された渦発生体により発生され
るカルマン渦を利用した渦流Ｗｃ ｔｌに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vortex flow Wc tl that utilizes a Karman vortex generated by a vortex generator disposed in a fluid.
疋、ＬＬ苅
周知のように、流体中に柱状の渦発生体を挿入すると、
該渦発生体の両側面で流れが剥離し、該渦発生体の下流
側に交互に規則的な渦すなわちカルマン渦が発生する。LL.KariAs is well known, when a columnar vortex generator is inserted into a fluid,
The flow separates on both sides of the vortex generator, and regular vortices, that is, Karman vortices, are generated alternately on the downstream side of the vortex generator.
このカルマン渦の発生数は、流体の流速又は流量に比例
しているところから、このカルマン渦の数を計数するこ
とにより、流量を計測することができる。而して、従来
は、このカルマン渦を計数するために、該カルマン渦を
横切って超音波を送受信し、該超音波の周波数変調或い
は位相変調を検出するようにしていたが、外部からの雑
音等によって被測定流体の流れに乱れが生じ、これが３
１測誤差の一因ともなっていた。Since the number of Karman vortices generated is proportional to the flow velocity or flow rate of the fluid, the flow rate can be measured by counting the number of Karman vortices. Conventionally, in order to count these Karman vortices, ultrasonic waves were transmitted and received across the Karman vortices, and the frequency modulation or phase modulation of the ultrasonic waves was detected. Disturbances occur in the flow of the fluid to be measured due to
This was also a cause of measurement error.
比−一一旬
本発明は、Ｌ述のごとき実情に鑑みてなされたもので、
外部雑音等の影響を受けることなく、正確にカルマン渦
を計測し得るようにした新規構成の渦流量計に関する。The present invention was made in view of the actual situation as described in L.
This invention relates to a vortex flow meter with a new configuration that allows accurate measurement of Karman vortices without being affected by external noise.
乳−−］
第１図は、本発明による渦流量計の一実施例を説明する
ための要部構成図で（Ａ）図は（Ｂ）図のＡ−Ａ線断面
図、（Ｂ）図は（Ａ）図のＢ−Ｂ線断面図で、図中、ｌ
は被測定流体が流れている流路管、２は周知の渦発生体
、３ａ、３ｂは該渦発生体２によって発生されたカルマ
ン渦、４は本発明によって設けられた中空体て、該中空
体４は前記渦発生体２の下流側に該渦発生体２と直角に
交る方向に配設され、かつ、軸方向に所定の間隔をもっ
て少なくとも１対の孔４ ａ ’＋ ４ ｂを４１して
いる。而して、周知のように、カルマン渦３ａが発生し
た時は、孔４ａ側の圧力が下り、カルマン渦３ｂが発生
した時は、孔４ｂ側の圧力が下るか、この圧力変化は、
孔４ａ、４ｂを通して中空体４内の流体にも及び、該中
空体４内の流体に矢印方向に△Ｐの圧力差を交互に発生
させる。従って、この中空体４内における流体の移動、
圧力差等を任意所望の手段例えば超音波、レーザ光、感
圧素子等を用いて計測すれば、力、ルマン渦の発生数を
計測することができる・
第２図は、上記中空体の変形例を示す断面図で、（Ａ）
図は前記孔４ａ、４ｂを中空体４の下流側に設けた例、
ＣＢ）図は前記中空体４の下流側を流線形にし、もって
、該中空体４によってカルマン渦が発生するのを防止す
るようにした例（該中空体４によって発生されるカルマ
ン渦が該中空体４に設けられた孔４ａ、４ｂを通して該
中空体４内の流体に影響する恐れがある）、（Ｃ）図は
前記流線形中空体４の下流側に孔４ａ 、 ４ｂを設け
た例、（Ｄ）図は円筒形中空体４の下流側に該中空体４
と平行に仕切板５を設け、中空体４によってカルマン渦
ができるのを防止するようにした例、（Ｅ）図は前記仕
切板を設けた中空体において、該中空体４の下流側に孔
４ａ 、４ｂを設けた例、（Ｆ）図は前記中空体４の上
流側に防塵板６を設け、孔４ａ、４ｂが塵埃等によって
詰まったり、鎖孔４ａ、４ｂを通して中空体４内に塵埃
が入るのを防止するようにした例で、この防塵板６は中
空体４の一ヒ流側全長に亘って設けても、或いは、孔４
ａ、４ｂの」二流側にのみ設けてもよい。なお、本発明
はよる渦流量計は、液体、気体のいずれに対しても適用
可能であるが、気体、特に、高温ノ左気等の流量を測定
する場合には、第１図（Ａ）に示すように、中空体４に
更に排水孔７を設けておき、該中空体４内に溜まった水
滴を該（）１水孔７を通して排出するようにするとよい
。また、以Ｈに、中空体４に１対の孔４ａ、４ｂを設け
た例について説明したが、鎖孔は１対に限定されるもの
ではなく、また、必ずしも対になっていなくてはならな
いものでもないことは容易に理解されよう。[Milk--] Figure 1 is a main part configuration diagram for explaining one embodiment of a vortex flowmeter according to the present invention, and (A) is a cross-sectional view taken along line A-A in (B), and (B) is is a sectional view taken along the line B-B in figure (A), and in the figure, l
2 is a well-known vortex generator; 3a and 3b are Karman vortices generated by the vortex generator 2; 4 is a hollow body provided according to the present invention; The body 4 is disposed on the downstream side of the vortex generator 2 in a direction perpendicular to the vortex generator 2, and has at least one pair of holes 4a'+4b at a predetermined interval in the axial direction. are doing. As is well known, when the Karman vortex 3a is generated, the pressure on the hole 4a side decreases, and when the Karman vortex 3b is generated, the pressure on the hole 4b side decreases, or this pressure change is
The pressure is also applied to the fluid inside the hollow body 4 through the holes 4a and 4b, and a pressure difference of ΔP is alternately generated in the fluid inside the hollow body 4 in the direction of the arrow. Therefore, the movement of fluid within this hollow body 4,
By measuring the pressure difference using any desired means such as ultrasonic waves, laser light, pressure-sensitive elements, etc., the force and the number of Le Mans vortices generated can be measured. Figure 2 shows the deformation of the hollow body described above. In a cross-sectional view showing an example, (A)
The figure shows an example in which the holes 4a and 4b are provided on the downstream side of the hollow body 4,
Figure CB) shows an example in which the downstream side of the hollow body 4 is streamlined to prevent the generation of Karman vortex by the hollow body 4 (the Karman vortex generated by the hollow body 4 is The fluid inside the hollow body 4 may be affected through the holes 4a and 4b provided in the body 4), (C) is an example in which the holes 4a and 4b are provided on the downstream side of the streamlined hollow body 4. (D) The diagram shows the hollow body 4 on the downstream side of the cylindrical hollow body 4.
An example in which a partition plate 5 is provided in parallel with the hollow body 4 to prevent the formation of Karman vortices. 4a and 4b, in which a dustproof plate 6 is provided on the upstream side of the hollow body 4, and the holes 4a and 4b are clogged with dust, and dust enters the hollow body 4 through the chain holes 4a and 4b. In this example, the dust-proof plate 6 can be provided over the entire length of the flow side of the hollow body 4, or can be provided over the entire length of the hole 4.
It may be provided only on the second-stream side of a and 4b. The vortex flowmeter according to the present invention can be applied to both liquids and gases, but when measuring the flow rate of gases, especially high-temperature air, etc., the vortex flowmeter shown in FIG. As shown in FIG. 1, it is preferable that a drainage hole 7 is further provided in the hollow body 4 so that the water droplets accumulated in the hollow body 4 can be discharged through the water hole 7. In addition, although an example in which a pair of holes 4a and 4b are provided in the hollow body 4 has been described below, the number of chain holes is not limited to one pair, and they do not necessarily have to form a pair. It is easy to understand that this is nothing.
第３図は、本発明の他の実施例を示す要部拡大構成図で
、この実施例は、図示のように、中空体４の孔４ａ 、
４ｂをギ０う防塵板６ａ、６ｂを中空体４と一体的に設
けたもので、このようにすると、中空体４の穴４ａ、４
ｂの方向を上流側、下流側のいずれの方向に向けても鎖
孔４ａ、４ｂを通して中空体４内に塵埃等が混入するよ
うなことはない。その際、防塵板の開口部を図示のよう
に渦側に開口しておくと、該渦に基づく圧力変化を効果
的に中空体４内に導くことができる。FIG. 3 is an enlarged configuration diagram of main parts showing another embodiment of the present invention. In this embodiment, as shown, the holes 4a of the hollow body 4,
The dustproof plates 6a and 6b that cover the holes 4b are provided integrally with the hollow body 4.
No matter which direction b is directed, upstream or downstream, no dust or the like will enter the hollow body 4 through the chain holes 4a, 4b. At that time, if the opening of the dustproof plate is opened toward the vortex side as shown in the figure, pressure changes caused by the vortex can be effectively guided into the hollow body 4.
軌−一一盟
以トの説明から明らかなように、本発明によると、カル
マン渦の計測を、外乱の影響を受けない中空体内で行う
よにしたので、精度よく行うことができる。As is clear from the above description, according to the present invention, since the Karman vortex is measured in a hollow body that is not affected by disturbances, it can be performed with high accuracy.
第１図は、本発明による渦流量計の要部構成図で、（Ａ
）図は（Ｂ）図のＡ、−Ａ線断面図、ＣＢ）図は（Ａ）
図のＢ−Ｂ線断面図、第２図（Ａ）〜（Ｆ）は、それぞ
れ本発明の実施に使用し得る中空体の変形例を示す図、
第３図は、本発明の一実施例を示す要部拡大構成図であ
る。
１・・・流路管、２・・・渦発生体、３ａ、３ｂ・・・
カルマン渦、４・・・中空体、４ａ、４ｂ・・・孔、５
・・・仕切板、６．６ａ、６ｂ・・・防塵板、７・・・
刊本孔。
特許出願人 オーバル機器工業株式会社第 ｌ
図
ＣＡ１ （Ｂ。
第２図
（Ａ） ｔＦｌ
第３図FIG. 1 is a block diagram of the main parts of the vortex flow meter according to the present invention, (A
) The figure is (B) A, -A cross-sectional view of the figure, CB) The figure is (A)
The cross-sectional view taken along the line B-B in the figure and FIGS. 2 (A) to (F) are views showing modified examples of the hollow body that can be used to implement the present invention, respectively.
FIG. 3 is an enlarged configuration diagram of main parts showing an embodiment of the present invention. 1... Channel pipe, 2... Vortex generator, 3a, 3b...
Karman vortex, 4... hollow body, 4a, 4b... hole, 5
...Partition plate, 6.6a, 6b...Dustproof plate, 7...
Published by Honkou. Patent applicant Oval Equipment Industry Co., Ltd. No. 1
Figure CA1 (B. Figure 2 (A) tFl Figure 3
Claims (7)
生体の後流側に前記渦発生体と交差する方向に配設され
た中空体と、該中空体の軸方向に所定の間隔を置いて設
けられた少なくとも１対の孔を有し、該中空体内におけ
る流体の圧力変動を検出するようにしたことを特徴とす
る渦流量計。(1) A vortex generator disposed in the fluid to be measured, a hollow body disposed on the downstream side of the vortex generator in a direction intersecting the vortex generator, and an axial direction of the hollow body. 1. A vortex flowmeter comprising at least one pair of holes provided at a predetermined interval in the hollow body, the vortex flowmeter being configured to detect pressure fluctuations of fluid within the hollow body.
ていることを特徴とする特許請求の範囲第（１）項に記
載の渦流量計。(2) The vortex flowmeter according to claim (1), wherein the hole is provided on the 1-stream side surface of the hollow body.
けられていることを特徴とする特許請求の範囲第（＋）
項に記載の渦流量計。(3) Claim No. (+) characterized in that niJ holes are provided on the downstream surface of the hollow body.
Vortex flowmeter as described in Section.
ことを特徴とする特許請求の範囲第（１）項乃￥第（３
） ｆＡのいずれか１項に記載の渦流量計。(4) The downstream side of the hollow body is formed in a streamlined shape.
) The vortex flowmeter according to any one of fA.
板か設けられていることを特徴とする特許請求の範囲第
（１）項乃至第（３）項のいずれか１項に記載の渦流量
計。(5) Any one of claims (1) to (3), characterized in that a partition plate is provided on the downstream side of the hollow body in parallel with the hollow body. Vortex flowmeter as described in.
を防止するための防塵板を有することを特徴とする特許
請求の範囲第（１）項乃至第（５）項のいずれか１項に
記載の渦流量計。(6) A dustproof plate is provided on the upstream side of the hollow body to prevent dust from entering the hole. The vortex flow meter according to item 1.
孔に塵埃か入るのを防止する防塵板を設けたことを特徴
とする特許請求の範囲ｆＢ（１）項乃至第（５）項のい
ずれか１項に記載の渦流量目。 （ｅ） 、 「１ｉｊ記中空体に排水孔を有することを
特徴とする特許請求の範囲第（１）項乃至第（７）項の
いずれか１項に記載の渦がＬ箪ハ１゜(7) Claims fB (1) to (1) above characterized in that a dustproof plate is provided on the north side of the hole of the hollow body to prevent dust from entering the hole integrally with the hollow body. (5) The eddy flow item described in any one of the items. (e) The vortex according to any one of claims (1) to (7), characterized in that the hollow body has a drainage hole,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58060333A JPS59187222A (en) | 1983-04-06 | 1983-04-06 | Vortex flow-meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58060333A JPS59187222A (en) | 1983-04-06 | 1983-04-06 | Vortex flow-meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59187222A true JPS59187222A (en) | 1984-10-24 |
| JPH059724B2 JPH059724B2 (en) | 1993-02-05 |
Family
ID=13139133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58060333A Granted JPS59187222A (en) | 1983-04-06 | 1983-04-06 | Vortex flow-meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59187222A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62150630U (en) * | 1986-03-16 | 1987-09-24 | ||
| EP0240772A2 (en) * | 1986-03-15 | 1987-10-14 | Oval Engineering Co., Ltd. | A vortex flow meter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5368272A (en) * | 1976-11-30 | 1978-06-17 | Nissan Motor | Flow meter for von k*arman*s vortex street |
-
1983
- 1983-04-06 JP JP58060333A patent/JPS59187222A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5368272A (en) * | 1976-11-30 | 1978-06-17 | Nissan Motor | Flow meter for von k*arman*s vortex street |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0240772A2 (en) * | 1986-03-15 | 1987-10-14 | Oval Engineering Co., Ltd. | A vortex flow meter |
| US4838092A (en) * | 1986-03-15 | 1989-06-13 | Oval Engineering Co., Ltd. | Vortex flow meter |
| JPS62150630U (en) * | 1986-03-16 | 1987-09-24 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH059724B2 (en) | 1993-02-05 |
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