JPH11344366A - Vortex flowmeter - Google Patents

Vortex flowmeter

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Publication number
JPH11344366A
JPH11344366A JP15255398A JP15255398A JPH11344366A JP H11344366 A JPH11344366 A JP H11344366A JP 15255398 A JP15255398 A JP 15255398A JP 15255398 A JP15255398 A JP 15255398A JP H11344366 A JPH11344366 A JP H11344366A
Authority
JP
Japan
Prior art keywords
pipe
measurement
inner diameter
fluid
vortex 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.)
Pending
Application number
JP15255398A
Other languages
Japanese (ja)
Inventor
Tadao Mikami
忠生 三上
Tetsuo Ando
哲男 安藤
Akio Yoshino
昭男 吉野
Riyuugo Hosoiri
龍五 細入
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yokogawa Electric Corp filed Critical Yokogawa Electric Corp
Priority to JP15255398A priority Critical patent/JPH11344366A/en
Publication of JPH11344366A publication Critical patent/JPH11344366A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To alleviate turbulence in a measuring fluid and to improve linearity by providing an alleviating means for the flow turbulence in the fluid at the opening of a pipeline inlet of measuring pipeline. SOLUTION: A Karman vortex is generated in a measuring fluid FLo by a vortex generator 2 in a pipeline 1 disposed on the way of a piping A. A flow rate of the fluid FLo is measured by measuring a vortex generating frequency changing in proportion to a flow velocity of the fluid FLo . A chamfered part 11 is, for example, provided at the opening of a pipeline inlet of the pipeline 1 to alleviate the turbulence in the fluid. Thus, the turbulence in the fluid FLo generated in the inlet of the pipeline 1 can be alleviated. As a result, the vortex flow measurement in which linearity are improved can be executed.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、測定管路入り口に
生ずる測定流体の流れの乱れを軽減することにより得ら
れる、リニアリティ特性が向上された渦流量計に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vortex flowmeter having improved linearity characteristics obtained by reducing disturbance of a flow of a measurement fluid generated at an entrance of a measurement pipe.

【０００２】[0002]

【従来の技術】図５は、従来より一般に使用されている
従来例の構成説明図で、例えば、Ｔｅｃｈｎｉｃａｌ
Ｉｎｆｏｒｍａｔｉｏｎ、［渦流量計 ＹＥＷＦＬＯ入
門書］Ｐ１５ 図８．６、横河電機株式会社発行、１９
９４．４．２ 第２版 に示されている。2. Description of the Related Art FIG. 5 is an explanatory view of the structure of a conventional example generally used in the prior art.
Information, [Introduction to Vortex Flowmeter YEWFLO] P15 Figure 8.6, published by Yokogawa Electric Corporation, 19
It is shown in 94.4.2 Second Edition.

【０００３】図において、測定管路１は、測定流体ＦＬ
oが流れる配管Ａの途中に配置され、この配管Ａの内径
ＤAより僅か小さな内径Ｄ1を有する。渦発生体２は、測
定管路１に直角に挿入され、台形断面を持ち柱状をな
す。ガスケットＢは、配管Ａと測定管路１との間に設け
られている。[0003] In the figure, a measuring pipe 1 is provided with a measuring fluid FL.
o is placed in the middle of the flow pipe A, with a slightly smaller inner diameter D 1 than the inner diameter D A of the pipe A. The vortex generator 2 is inserted at a right angle into the measurement pipeline 1, has a trapezoidal cross section, and has a columnar shape. The gasket B is provided between the pipe A and the measurement pipe 1.

【０００４】以上の構成において、測定流体ＦＬoが、
測定管路１に流されると、渦発生体２によりカルマン渦
が発生し、測定流体ＦＬoの流速に比例して、渦発生周
波数が変化する。この渦発生周波数を測定することによ
り、測定流体ＦＬoの流量が、測定される。[0004] In the above configuration, the measurement fluid FL o is,
When flowing to the measurement pipe 1, a Karman vortex is generated by the vortex shedder 2, in proportion to the flow rate of the measurement fluid FL o, the vortex shedding frequency changes. By measuring the vortex shedding frequency, the flow rate of the measurement fluid FL o is measured.

【０００５】[0005]

【発明が解決しようとする課題】しかしながら、この様
な装置においては、測定管路１は、流量特性を確保する
ために、配管Ａの内径ＤAより僅か小さな内径Ｄ1を有す
る。このため、測定管路１の内径入り口部３は直角断面
形状となる。[SUMMARY OF THE INVENTION However, in such apparatus, measurement line 1, in order to ensure the flow characteristics, with a slightly smaller inner diameter D 1 than the inner diameter D A of the pipe A. For this reason, the inner diameter entrance 3 of the measurement pipe 1 has a right-angle cross-sectional shape.

【０００６】この内径入り口部３の直角断面形状の存在
により、測定流体ＦＬoの流れに乱れが生ずる。[0006] The presence of a right angle cross-sectional shape of the inner diameter inlet portion 3, turbulence occurs in the flow of the measurement fluid FL o.

【０００７】この測定流体ＦＬoの流れの乱れは、測定
流体ＦＬoの流速によって、その影響が及ぶ範囲が異な
る。このため、渦流量計のリニアリティ特性に悪影響を
及ぼす。[0007] turbulence of the flow of the measurement fluid FL o, depending velocity measurement fluid FL o, range the effect is exerted is different. This adversely affects the linearity characteristics of the vortex flowmeter.

【０００８】本発明は、この問題点を解決するものであ
る。本発明の目的は、測定管路入り口に生ずる測定流体
の流れの乱れを軽減することにより得られる、リニアリ
ティ特性が向上された渦流量計を提供するにある。The present invention solves this problem. An object of the present invention is to provide a vortex flowmeter having improved linearity characteristics, which is obtained by reducing disturbance of a flow of a measurement fluid generated at an entrance of a measurement pipe.

【０００９】[0009]

【課題を解決するための手段】この目的を達成するため
に、本発明は、 （１）測定流体が流れる配管の途中に配置されこの配管
の内径より僅か小さな内径を有する測定管路を具備する
渦流量計において、前記測定管路の内径部分に設けられ
測定管路の測定流体流入部分に生ずる測定流体の流れの
乱れを軽減する軽減手段を具備したことを特徴とする渦
流量計。 （２）前記軽減手段として前記測定管路の管路入口の内
径部分に設けられた面取り部を具備したことを特徴とす
る（１）記載の渦流量計。 （３）前記軽減手段として前記測定管路の管路入口の内
径部分に設けられた曲面部を具備したことを特徴とする
（１）記載の渦流量計。 （４）前記軽減手段として前記測定管路の管路入口の内
径部分に設けられたテーパー部を具備したことを特徴と
する（１）記載の渦流量計。 （５）前記軽減手段として前記測定管路の内径部分全体
に設けられたテーパー部を具備したことを特徴とする
（１）記載の渦流量計。 を構成したものである。In order to achieve this object, the present invention provides: (1) a measuring pipe which is arranged in the middle of a pipe through which a measuring fluid flows and has an inner diameter slightly smaller than the inner diameter of the pipe; The vortex flowmeter according to claim 1, further comprising a reduction means provided at an inner diameter portion of said measurement pipe to reduce turbulence of a flow of a measurement fluid generated at a measurement fluid inflow portion of said measurement pipe. (2) The vortex flowmeter according to (1), wherein a chamfered portion provided at an inner diameter portion of a pipe entrance of the measurement pipe is provided as the reducing means. (3) The vortex flowmeter according to (1), wherein the mitigation means includes a curved surface portion provided at an inner diameter portion of a pipe entrance of the measurement pipe. (4) The vortex flowmeter according to (1), wherein a taper portion provided at an inner diameter portion of a pipe inlet of the measurement pipe is provided as the reducing means. (5) The vortex flowmeter according to (1), wherein a taper portion provided on the entire inner diameter portion of the measurement pipeline is provided as the reducing means. It is what constituted.

【００１０】[0010]

【作用】以上の構成において、測定流体が、測定管路に
流されると、渦発生体によりカルマン渦が発生し、測定
流体の流速に比例して、渦発生周波数が変化する。この
渦発生周波数を測定することにより、測定流体の流量
が、測定される。In the above arrangement, when the measurement fluid flows through the measurement pipe, Karman vortices are generated by the vortex generator, and the vortex generation frequency changes in proportion to the flow velocity of the measurement fluid. By measuring the vortex generation frequency, the flow rate of the measurement fluid is measured.

【００１１】しかして、測定管路の管路入口の内径部分
に、面取り部が設けられているので、測定管路の管路入
口の内径部分に生じる測定流体の流れの乱れを軽減する
ことが出来る。以下、実施例に基づき詳細に説明する。However, since the chamfered portion is provided at the inner diameter of the pipe entrance of the measurement pipe, it is possible to reduce the disturbance of the flow of the measurement fluid generated at the inner diameter of the pipe inlet of the measurement pipe. I can do it. Hereinafter, a detailed description will be given based on embodiments.

【００１２】[0012]

【発明の実施の形態】図１は本発明の一実施例の要部構
成説明図である。図において、図５と同一記号の構成は
同一機能を表わす。以下、図５と相違部分のみ説明す
る。面取り部１１は、測定管路の管路入口の内径部分３
に設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a main part of an embodiment of the present invention. In the figure, the configuration of the same symbol as FIG. 5 represents the same function. Hereinafter, only differences from FIG. 5 will be described. The chamfered portion 11 has an inner diameter portion 3 at the inlet of the measuring line.
It is provided in.

【００１３】以上の構成において、測定流体ＦＬoが、
測定管路１に流されると、渦発生体２によりカルマン渦
が発生し、測定流体ＦＬoの流速に比例して、渦発生周
波数が変化する。この渦発生周波数を測定することによ
り、測定流体ＦＬoの流量が、測定される。[0013] In the above configuration, the measurement fluid FL o is,
When flowing to the measurement pipe 1, a Karman vortex is generated by the vortex shedder 2, in proportion to the flow rate of the measurement fluid FL o, the vortex shedding frequency changes. By measuring the vortex shedding frequency, the flow rate of the measurement fluid FL o is measured.

【００１４】しかして、測定管路の管路入口の内径部分
３に、面取り部１１が設けられているので、測定管路の
管路入口の内径部分３に生じる測定流体ＦＬoの流れの
乱れを軽減することが出来る。この結果、リニアリティ
特性が向上された渦流量計が得られる。[0014] Thus, the inner diameter portion 3 of the pipe inlet of the measuring tube, since the chamfered portion 11 is provided, the flow of the measurement fluid FL o occurring inside diameter portion 3 of the pipe inlet of the measuring tubes disturbances Can be reduced. As a result, a vortex flowmeter with improved linearity characteristics is obtained.

【００１５】図２は本発明の他の実施例の要部構成説明
図である。本実施例においては、曲面部２１が、測定管
路１の管路入口の内径部分３に設けられている。FIG. 2 is an explanatory diagram of a main part configuration of another embodiment of the present invention. In the present embodiment, the curved surface portion 21 is provided on the inner diameter portion 3 of the pipeline entrance of the measurement pipeline 1.

【００１６】しかして、測定管路１の管路入口の内径部
分３に、曲面部２１が設けられたので、更に、測定流体
ＦＬoの流れがなめらかになり、測定管路の管路入口の
内径部分３に生じる測定流体ＦＬoの流れの乱れを、更
に軽減することが出来る渦流量計が得られる。[0016] Thus, the conduit inlet of the inside diameter portion 3 of the measuring pipe 1, since the curved portion 21 is provided, further, becomes smoother flow of the measurement fluid FL o, the measuring tube conduit inlet of the turbulence of the flow of the measurement fluid FL o occurring inside diameter portion 3, the vortex flowmeter is obtained which can be further reduced.

【００１７】図３は本発明の他の実施例の要部構成説明
図である。本実施例においては、テーパー部３１が、測
定管路１の管路入口の内径部分３に設けられている。FIG. 3 is an explanatory view of a main part configuration of another embodiment of the present invention. In the present embodiment, the tapered portion 31 is provided on the inner diameter portion 3 of the pipe entrance of the measurement pipe 1.

【００１８】この結果、測定管路１の管路入口の内径部
分３に、テーパー部３１が設けられたので、配管Ａと測
定管路１との、段差の程度に合わせて、テーパー角度を
自由に設定することが出来、更に、測定流体ＦＬoの流
れがなめらかになり、測定管路の管路入口の内径部分３
に生じる測定流体ＦＬoの流れの乱れを、更に軽減する
ことが出来る渦流量計が得られる。As a result, since the tapered portion 31 is provided at the inner diameter portion 3 of the pipe entrance of the measurement pipe 1, the taper angle can be freely adjusted according to the level difference between the pipe A and the measurement pipe 1. can be set to, further, it becomes smoother flow of the measurement fluid FL o, inner diameter of the pipe inlet of the measuring tube 3
The measurement fluid FL o turbulence in the flow which occurs, the vortex flowmeter is obtained which can be further reduced.

【００１９】図４は本発明の他の実施例の要部構成説明
図である。本実施例においては、テーパー部４１が、測
定管路１の内径部分全体に設けられている。FIG. 4 is an explanatory diagram of a main part configuration of another embodiment of the present invention. In the present embodiment, the tapered portion 41 is provided on the entire inner diameter portion of the measurement pipeline 1.

【００２０】この結果、測定管路１の内径部分全体に、
テーパー部４１が設けられたので、測定管路１の内径部
分全体に於いて、内径直径が徐々に絞られたかたちにな
るので、更に、測定流体ＦＬoの流れがなめらかにな
り、測定管路の管路入口の内径部分３に生じる測定流体
ＦＬoの流れの乱れを、更に軽減することが出来る。As a result, the entire inner diameter portion of the measurement pipe 1 is
Since the tapered portion 41 is provided, in the entire inner diameter of the measuring pipe 1, since the shape of the inner diameter diameter is gradually narrowed, further flow of the measurement fluid FL o becomes smooth, measuring tubes turbulence, and it is possible to further reduce the line inlet of the flow of the measurement fluid FL o occurring inside diameter portion 3.

【００２１】[0021]

【発明の効果】以上詳細に説明したように、本発明の請
求項１によれば、測定管路の内径部分に設けられ測定管
路の測定流体流入部分に生ずる測定流体の流れの乱れを
軽減する軽減手段が設けられので、測定管路の管路入口
の内径部分に生じる測定流体の流れの乱れを軽減するこ
とが出来る渦流量計が得られる。この結果、リニアリテ
ィ特性が向上された渦流量計が得られる。As described above in detail, according to the first aspect of the present invention, the turbulence of the flow of the measurement fluid which is provided at the inner diameter portion of the measurement pipe and which occurs at the measurement fluid inflow portion of the measurement pipe is reduced. As a result, a vortex flowmeter can be obtained which can reduce the disturbance of the flow of the measurement fluid generated at the inner diameter portion of the pipe entrance of the measurement pipe. As a result, a vortex flowmeter with improved linearity characteristics is obtained.

【００２２】本発明の請求項２によれば、軽減手段とし
て、測定管路の管路入口の内径部分に面取り部が設けら
れたので、測定管路の管路入口の内径部分に生じる測定
流体の流れの乱れを軽減することが出来る渦流量計が得
られる。この結果、リニアリティ特性が向上された渦流
量計が得られる。According to the second aspect of the present invention, since the chamfered portion is provided at the inner diameter portion of the pipe entrance of the measuring pipe as the reducing means, the measurement fluid generated at the inner diameter section of the pipe inlet of the measuring pipe is provided. A vortex flowmeter capable of reducing the turbulence in the flow of air is obtained. As a result, a vortex flowmeter with improved linearity characteristics is obtained.

【００２３】本発明の請求項３によれば、軽減手段とし
て、測定管路の管路入口の内径部分に曲面部が設けられ
たので、更に、測定流体の流れがなめらかになり、測定
管路の管路入口の内径部分に生じる測定流体の流れの乱
れを、更に軽減することが出来る渦流量計が得られる。
この結果、リニアリティ特性が向上された渦流量計が得
られる。According to the third aspect of the present invention, since the curved portion is provided at the inner diameter portion of the pipe entrance of the measuring pipe as the reducing means, the flow of the measuring fluid is further smoothed, A vortex flowmeter capable of further reducing the disturbance of the flow of the measurement fluid generated at the inner diameter portion of the pipeline inlet is obtained.
As a result, a vortex flowmeter with improved linearity characteristics is obtained.

【００２４】本発明の請求項４によれば、軽減手段とし
て、測定管路の管路入口の内径部分にテーパー部が設け
られたので、配管と測定管路との、段差の程度に合わせ
て、テーパー角度を自由に設定することが出来、更に、
測定流体の流れがなめらかになり、測定管路の管路入口
の内径部分に生じる測定流体の流れの乱れを、更に軽減
することが出来る渦流量計が得られる。この結果、リニ
アリティ特性が向上された渦流量計が得られる。According to the fourth aspect of the present invention, as the reducing means, the tapered portion is provided at the inner diameter portion of the pipe entrance of the measuring pipe, so that the degree of the step between the pipe and the measuring pipe can be adjusted. , The taper angle can be set freely.
The flow of the measurement fluid is smoothened, and a vortex flowmeter capable of further reducing the disturbance of the flow of the measurement fluid generated at the inner diameter portion of the pipe entrance of the measurement pipe is obtained. As a result, a vortex flowmeter with improved linearity characteristics is obtained.

【００２５】本発明の請求項５によれば、軽減手段とし
て、測定管路の内径部分全体に設けられたテーパー部が
設けられたので、測定管路１の内径部分全体に於いて、
内径直径が徐々に絞られたかたちになるので、更に、測
定流体の流れがなめらかになり、測定管路の管路入口の
内径部分に生じる、測定流体の流れの乱れを、更に軽減
することが出来る。この結果、リニアリティ特性が向上
された渦流量計が得られる。According to the fifth aspect of the present invention, the taper portion provided on the entire inner diameter portion of the measurement pipe is provided as the reducing means.
Since the inner diameter is gradually reduced, the flow of the measurement fluid becomes smoother, and the turbulence of the flow of the measurement fluid generated at the inner diameter portion of the pipe inlet of the measurement pipe can be further reduced. I can do it. As a result, a vortex flowmeter with improved linearity characteristics is obtained.

【００２６】従って、本発明によれば、測定管路入り口
に生ずる測定流体の流れの乱れを軽減することにより得
られる、リニアリティ特性が向上された渦流量計を実現
することが出来る。Therefore, according to the present invention, it is possible to realize a vortex flowmeter with improved linearity characteristics, which is obtained by reducing the disturbance of the flow of the measurement fluid generated at the entrance of the measurement pipe.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の一実施例の要部構成説明図である。FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention.

【図２】本発明の他の実施例の要部構成説明図である。
図１の動作説明図である。FIG. 2 is an explanatory diagram of a main part configuration of another embodiment of the present invention.
FIG. 2 is an operation explanatory diagram of FIG. 1.

【図３】本発明の他の実施例の要部構成説明図である。FIG. 3 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

【図４】本発明の他の実施例の要部構成説明図である。FIG. 4 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

【図５】従来より一般に使用されている従来例の構成説
明図である。FIG. 5 is an explanatory diagram of a configuration of a conventional example generally used in the related art.

【符号の説明】[Explanation of symbols]

１ 測定管路 ２ 渦発生体 １１ 面取り部 ２１ 曲面部 ３１ テーパー部 ４１ テーパー部 Ａ 配管 Ｂ ガスケット DESCRIPTION OF SYMBOLS 1 Measurement pipe line 2 Vortex generator 11 Chamfer part 21 Curved surface part 31 Taper part 41 Taper part A Pipe B Gasket

───────────────────────────────────────────────────── フロントページの続き (72)発明者 細入 龍五 東京都武蔵野市中町２丁目９番32号 横河 電機株式会社内 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Ryugo Hosiri 2-9-132 Nakamachi, Musashino City, Tokyo Inside Yokogawa Electric Corporation

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】測定流体が流れる配管の途中に配置されこ
の配管の内径より僅か小さな内径を有する測定管路を具
備する渦流量計において、 前記測定管路の内径部分に設けられ測定管路の測定流体
流入部分に生ずる測定流体の流れの乱れを軽減する軽減
手段を具備したことを特徴とする渦流量計。1. A vortex flowmeter provided with a measurement pipe having an inner diameter slightly smaller than an inner diameter of a pipe through which a measurement fluid flows, wherein the vortex flowmeter is provided at an inner diameter portion of the measurement pipe. A vortex flowmeter comprising a reducing means for reducing turbulence of a flow of a measurement fluid generated in a measurement fluid inflow portion. 【請求項２】前記軽減手段として前記測定管路の管路入
口の内径部分に設けられた面取り部を具備したことを特
徴とする請求項１記載の渦流量計。2. The vortex flowmeter according to claim 1, further comprising a chamfer provided on an inner diameter portion of a pipe entrance of the measurement pipe as the reducing means. 【請求項３】前記軽減手段として前記測定管路の管路入
口の内径部分に設けられた曲面部を具備したことを特徴
とする請求項１記載の渦流量計。3. The vortex flowmeter according to claim 1, further comprising a curved surface portion provided at an inner diameter portion of a pipe entrance of said measurement pipe as said reducing means. 【請求項４】前記軽減手段として前記測定管路の管路入
口の内径部分に設けられたテーパー部を具備したことを
特徴とする請求項１記載の渦流量計。4. The vortex flowmeter according to claim 1, further comprising a tapered portion provided at an inner diameter portion of a pipe entrance of said measurement pipe as said reducing means. 【請求項５】前記軽減手段として前記測定管路の内径部
分全体に設けられたテーパー部を具備したことを特徴と
する請求項１記載の渦流量計。5. The vortex flowmeter according to claim 1, further comprising a tapered portion provided on the entire inner diameter portion of said measurement pipe as said reducing means.
JP15255398A 1998-06-02 1998-06-02 Vortex flowmeter Pending JPH11344366A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15255398A JPH11344366A (en) 1998-06-02 1998-06-02 Vortex flowmeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15255398A JPH11344366A (en) 1998-06-02 1998-06-02 Vortex flowmeter

Publications (1)

Publication Number Publication Date
JPH11344366A true JPH11344366A (en) 1999-12-14

Family

ID=15542992

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15255398A Pending JPH11344366A (en) 1998-06-02 1998-06-02 Vortex flowmeter

Country Status (1)

Country Link
JP (1) JPH11344366A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005164581A (en) * 2003-11-03 2005-06-23 Rosemount Inc Flanged vortex flowmeter having integrated tapered expanded diameter part

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005164581A (en) * 2003-11-03 2005-06-23 Rosemount Inc Flanged vortex flowmeter having integrated tapered expanded diameter part

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