JPH037780Y2 - - Google Patents
Info
- Publication number
- JPH037780Y2 JPH037780Y2 JP1984169199U JP16919984U JPH037780Y2 JP H037780 Y2 JPH037780 Y2 JP H037780Y2 JP 1984169199 U JP1984169199 U JP 1984169199U JP 16919984 U JP16919984 U JP 16919984U JP H037780 Y2 JPH037780 Y2 JP H037780Y2
- Authority
- JP
- Japan
- Prior art keywords
- vortex
- hole
- flange
- insertion hole
- flowmeter
- 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
- 238000003780 insertion Methods 0.000 claims description 9
- 230000037431 insertion Effects 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野〕
この考案は、渦検出体に簡単な附加構造を施こ
して計測精度を向上した渦流量計に関する。[Detailed description of the invention] (Industrial field of application) This invention relates to a vortex flowmeter that improves measurement accuracy by adding a simple additional structure to the vortex detector.
周知のように渦流量計は、選択された形状と寸
法比をもつた渦発生体から発生されるカルマン渦
の周波数が流量に比例することを利用した所謂推
測型の流量計である。
As is well known, a vortex flowmeter is a so-called inferential flowmeter that utilizes the fact that the frequency of a Karman vortex generated by a vortex generator having a selected shape and size ratio is proportional to the flow rate.
一般に、この種の推測型の流量計にあつては、
流量対器差特性をレイノルズ特性として表示する
ことが多いが、これは流体力学的に規定される作
動が、レイノルズ数をパラメータとしている為で
ある。また、小口径の流量計においては、レイノ
ルズ数が小さいので流量計に流入する流体の流速
分布も抛物面に近くなる等の影響も加わるため、
大口径の流量計と比べて精度が低いのが普通であ
る。 Generally, for this type of inferential flowmeter,
The flow rate versus instrumental difference characteristic is often expressed as the Reynolds characteristic, because the fluid-dynamically defined operation uses the Reynolds number as a parameter. In addition, in small-diameter flowmeters, since the Reynolds number is small, the flow velocity distribution of the fluid flowing into the flowmeter is also affected by the fact that it approaches the surface of the rod.
They are usually less accurate than large-diameter flowmeters.
小形の渦流量計として例えば、第３図に示すも
のが知られている。図面について説明すれば、１
は被計測流体が流通する筒状部の流路２を有する
本体を示し、図示しない管フランジによつて同心
的に挟持されて使用に供される。３は前記本体１
の管壁を貫通した挿通孔、４はこの挿通孔３に挿
通した渦検出体を示し、この渦検出体４の固定鍔
部５を、本体１の外壁６にパツキン７を介して載
置し、ボルト８により着脱自在に固着されてい
る。渦検出体４は固体鍔部５と小径部９と鍔部１
１と渦発生部４１とから構成される。鍔部１１の
外径と挿通孔３の内径とは僅かな間隙ｇを設けて
ある。また、小径部９には凹陥部（図示せず）を
穿設し、該凹陥部内に圧電素子、歪ゲージなどの
渦検出素子を埋設してある。渦検出素子による検
出感度を高めるため、小径部９は鍔部１１より径
を小さくしてある。したがつて、被計測流体が渦
発生部４１を通過する際に生ずるカルマン渦によ
る交番圧力を、前記渦検出体４は固定鍔部５を支
点とする左右に変位する変動信号として受け、こ
の変動信号を、小径部９の凹陥部に埋設したの圧
電素子、歪ゲージなどの応力、歪量として検出で
きるものである。 For example, the one shown in FIG. 3 is known as a small vortex flowmeter. If you explain the drawings, 1.
1 shows a main body having a cylindrical flow path 2 through which a fluid to be measured flows, and is used while being concentrically held by pipe flanges (not shown). 3 is the main body 1
An insertion hole 4 penetrates the tube wall, and numeral 4 indicates a vortex detector inserted into the insertion hole 3. The fixed collar 5 of the vortex detector 4 is placed on the outer wall 6 of the main body 1 via a packing 7. , are removably fixed by bolts 8. The vortex detector 4 has a solid collar portion 5, a small diameter portion 9, and a collar portion 1.
1 and a vortex generating section 41. A slight gap g is provided between the outer diameter of the collar portion 11 and the inner diameter of the insertion hole 3. Further, a concave portion (not shown) is formed in the small diameter portion 9, and a vortex detecting element such as a piezoelectric element or a strain gauge is embedded in the concave portion. In order to increase the detection sensitivity of the vortex detection element, the small diameter portion 9 is made smaller in diameter than the collar portion 11. Therefore, the vortex detector 4 receives the alternating pressure due to the Karman vortex generated when the fluid to be measured passes through the vortex generating part 41 as a fluctuation signal that is displaced from side to side with the fixed collar part 5 as a fulcrum. Signals can be detected as stress and strain amounts from piezoelectric elements, strain gauges, etc. buried in the concave portion of the small diameter portion 9.
この従来例によれば、受圧面積の小さい小形の
渦流量計の場合、図示のように、渦発生部４１の
検出感度は高く、測定流量範囲も広くなるなどの
効果があるものの、空間部Ｈが形成されているの
で、渦発生部の左右に規則的に発生した渦が不安
定となる。したがつて、前記膨出部１１と挿通孔
３との間隙ｇをできる丈小さく形成している。し
かしながら、このような構成を施こした場合でも
レイノルズ数−器差特性は、第２図Ａに示すよう
にレイノルズ数が104〜105の範囲ではマイナス器
差となり、105以上ではプラス器差となるという
問題点があつた。 According to this conventional example, in the case of a small vortex flow meter with a small pressure-receiving area, the detection sensitivity of the vortex generating part 41 is high and the measurement flow range is wide, as shown in the figure. As a result, the vortices that are regularly generated on the left and right sides of the vortex generating part become unstable. Therefore, the gap g between the bulge 11 and the insertion hole 3 is made as small as possible. However, even with such a configuration, the Reynolds number-instrumental error characteristic becomes a negative instrumental error when the Reynolds number is in the range of 10 4 to 10 5 , and a positive instrumental error when the Reynolds number is 10 5 or more, as shown in Figure 2A. There was a problem with the difference.
この考案は叙上の問題点に着目して成されたも
ので、レイノルズ数−器差特性を改善し、鍔部の
下流側に簡単なバイパス流の導圧構溝設けてバイ
パス流が後流側に移行して渦剥離への影響を小さ
くした新規な渦流量計を提供することにある。
This idea was created by focusing on the above-mentioned problems, and it improved the Reynolds number-instrumental error characteristics, and created a simple bypass flow guide groove on the downstream side of the collar so that the bypass flow could flow into the wake. The object of the present invention is to provide a new vortex flowmeter that reduces the influence on vortex separation by moving to the side.
以下に、この考案の一実施例を第１図，第２図
について説明する。
An embodiment of this invention will be described below with reference to FIGS. 1 and 2.
なお、第１図の従来例と同一構成は同一符号で
示し、その説明の詳細は省く。 Components that are the same as those of the conventional example shown in FIG. 1 are indicated by the same reference numerals, and detailed explanation thereof will be omitted.
１２は、鍔部１１の下流側に空間部Ｈと流路２
と連通するよう穿つた導圧溝で、渦検出体４の軸
に平行した方向に沿つて形成してある。 12 includes a space H and a flow path 2 on the downstream side of the flange 11.
This is a pressure guiding groove bored to communicate with the vortex detector 4, and is formed along a direction parallel to the axis of the vortex detector 4.
叙上の構成に成るので、被計測流体が渦発生部
４１を通過する際に生ずるカルマン渦によつて渦
発生部４１に交番圧力の変動を与え、固定鍔部５
を支点として渦発生部４１を左右に変位させて渦
検出部９により所望の渦信号を得ることができる
が、渦発生部４１の後流側の低圧力部分に導圧溝
１２が設けてあるので鍔部１１の後流の流体抵抗
が小さくなり、間隙ｇを通過していたバイパス流
が導圧溝１２を通つて有効に流れることとなり、
したがつて従来と異なりバイパス流が後流側に移
行して渦剥離への影響が小さくなるため、第２図
に示すように全体として平坦な特性となつて、き
わめて安定した渦発生が得られ高精度の計測が可
能となる。 With the configuration described above, the Karman vortex generated when the fluid to be measured passes through the vortex generating section 41 causes alternating pressure fluctuations to be applied to the vortex generating section 41, and the fixed collar section 5
A desired vortex signal can be obtained by the vortex detection section 9 by displacing the vortex generation section 41 from side to side using the vortex generation section 41 as a fulcrum, but a pressure guiding groove 12 is provided in a low pressure part on the downstream side of the vortex generation section 41. Therefore, the fluid resistance downstream of the flange 11 becomes smaller, and the bypass flow that had passed through the gap g now effectively flows through the pressure guiding groove 12.
Therefore, unlike the conventional method, the bypass flow moves to the wake side and its influence on vortex separation becomes smaller, resulting in flat characteristics as a whole as shown in Figure 2, and extremely stable vortex generation can be obtained. Highly accurate measurement becomes possible.
この考案によれば、挿通孔内に挿通支持されて
カルマン渦の影響で変位する渦発生体の左右方向
に働く渦変動圧力に基づくバイパス流を、挿通孔
内径よりも僅かに小さな直径の鍔部の下流側に穿
設した導圧溝によつて有効に流出させて除去し、
渦剥離への影響を小さくしたため、安定した高精
度の流量計を提供できる。
According to this invention, the bypass flow based on the vortex fluctuation pressure acting in the left-right direction of the vortex generating body inserted and supported in the insertion hole and displaced by the influence of the Karman vortex is generated by the flange having a diameter slightly smaller than the inner diameter of the insertion hole. It is effectively drained and removed by the pressure impulse groove drilled on the downstream side of the
Since the influence on vortex separation is reduced, a stable and highly accurate flowmeter can be provided.
第１図はこの考案に係る渦流量計の一実施例を
示すものでイは一部切欠側面図、ロはイの要部の
拡大切欠正面図、ハはイのＡ−Ａ線拡大断面図、
第２図はレイノルズ数−器差特性のグラフ、第３
図は従来の一部切欠正面図である。
１……本体、３……挿通孔、４……渦検出体、
５……固定鍔部、９……小径部、１１……鍔部、
１２……導圧溝、ｇ……間隙。
Figure 1 shows an embodiment of the vortex flowmeter according to this invention, in which A is a partially cutaway side view, B is an enlarged notched front view of the main part of A, and C is an enlarged sectional view taken along the line A-A in A. ,
Figure 2 is a graph of Reynolds number vs. instrumental error characteristics;
The figure is a partially cutaway front view of a conventional device. 1... Main body, 3... Insertion hole, 4... Vortex detector,
5... fixed collar part, 9... small diameter part, 11... collar part,
12...Pressure groove, g...Gap.
Claims (1)
通し、該挿通孔に固定鍔部と小径部と鍔部と渦発
生部とから構成される渦検出体を貫通し、前記固
定鍔部を前記管壁に固着し、前記鍔部の外径を前
記挿通孔の内径より僅かに小さく形成した渦流量
計において、前記鍔部の下流側に前記小径部と貫
通孔とで形成された空間部と流路とを連通する導
圧溝を穿設したことを特徴とする渦流量計。 A through-hole is passed through the tube wall of the flow path through which the fluid to be measured flows, and a vortex detection body consisting of a fixed flange, a small diameter section, a flange, and a vortex generating section is passed through the insertion hole, and the fixed flange is inserted into the through-hole. In the vortex flowmeter, the outer diameter of the flange portion is formed to be slightly smaller than the inner diameter of the insertion hole, and the small diameter portion and the through hole are formed on the downstream side of the flange portion. A vortex flowmeter characterized by having a pressure groove that communicates a space and a flow path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984169199U JPH037780Y2 (en) | 1984-11-09 | 1984-11-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984169199U JPH037780Y2 (en) | 1984-11-09 | 1984-11-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6184813U JPS6184813U (en) | 1986-06-04 |
| JPH037780Y2 true JPH037780Y2 (en) | 1991-02-26 |
Family
ID=30726946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984169199U Expired JPH037780Y2 (en) | 1984-11-09 | 1984-11-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH037780Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57133318A (en) * | 1981-02-13 | 1982-08-18 | Yokogawa Hokushin Electric Corp | Measuring device of flow speed and flow rate |
| JPS5741115B2 (en) * | 1976-10-07 | 1982-09-01 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5741115U (en) * | 1980-08-21 | 1982-03-05 |
-
1984
- 1984-11-09 JP JP1984169199U patent/JPH037780Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5741115B2 (en) * | 1976-10-07 | 1982-09-01 | ||
| JPS57133318A (en) * | 1981-02-13 | 1982-08-18 | Yokogawa Hokushin Electric Corp | Measuring device of flow speed and flow rate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6184813U (en) | 1986-06-04 |
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