JPH07280610A - Vortex generator/converter for vortex flowmeter - Google Patents

Abstract

PURPOSE:To measure a low flow rate accurately regardless of the aperture of a flowmeter by inserting a vortex generator into a channel and a ball, oscillating while following up the vortex, in the rear of the vortex generator and then detecting oscillation of the ball floating in a fluid. CONSTITUTION:The vortex generator 1 generating vortex in proportion to the flow velocity and a ball 5 following up the movement of vortex 2 are inserted into a pipe 4 standing vertically. When the current velocity exceeds a predetermined level in a channel 7 having steeply increasing inner diameter, the ball 5 floats in the fluid. Since the ball 5 comes into contact only with the fluid, mechanical friction disappears. Consequently, the ball 5 oscillates accurately while following up the vortex 2 and when the oscillation is detected by means of a vortex detector 3, a low flow rate can be measured accurately through a simple apparatus.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】渦式流量計は使用数量、精度、価
格に於いてオリフィスメーターと肩を並べ今や流量計
（電気信号に変換する型）の市場を２分するほどであ
る。この様な中で渦式流量計は主に流量口径１５Ａ以上
が製作されている。少口径のものも勿論実験器として市
販品と同じ従来の考えで試作されている。この様な中で
正確、小型で、より安い流量を簡単に測る事が念願であ
った。[Industrial application] The vortex flowmeter is comparable to the orifice meter in terms of quantity used, accuracy, and price, and now halves the market for flowmeters (types that convert to electrical signals). Among them, the vortex flowmeter is mainly manufactured with a flow aperture of 15A or more. Of course, small-diameter ones are also experimentally manufactured as experimental devices with the same conventional idea as commercial products. Under such circumstances, it was a long-cherished desire to measure the flow rate accurately, compactly, and cheaper.

【０００２】[0002]

【従来の技術】変換には大別して２種類ある。ひとつは
流路内に渦発生機構と検出機構が一体に成った物を挿入
して渦の振動を測定する方法、（言い換えると流量を測
定する事になる。）この為に寸法に制約が出てきたり、
渦自身のエネルギーが小さい為少口径の物は製作が難し
い事になる。又別の方法は渦発生機構を流路内に、検出
機構を配管の側面に設置しパイプ４の外部より検出する
機構である。これらは超音波やプラズマ機構などを使用
するため高価で、なおかつ渦エネルギーが小さい為に相
互干渉やノイズにより誤差が増え、製作コストが高くな
る為微小流量測定の実用に耐えない。2. Description of the Related Art There are roughly two types of conversion. One is a method of measuring the vibration of the vortex by inserting an object in which the vortex generation mechanism and the detection mechanism are integrated into the flow path. (In other words, the flow rate is measured.) Because of this, there are restrictions on the dimensions. Come or
Since the energy of the vortex itself is small, it is difficult to manufacture a small caliber. Another method is a mechanism in which the vortex generation mechanism is installed in the flow path and the detection mechanism is installed on the side surface of the pipe to detect from the outside of the pipe 4. These are expensive because they use an ultrasonic wave or a plasma mechanism, and because the eddy energy is small, errors increase due to mutual interference and noise, and the manufacturing cost becomes high, so they are not practical for minute flow rate measurement.

【０００３】[0003]

【発明が解決しようとする課題】従来の技術の項で述べ
た通常の渦式流量計は渦発生機構と検出機構を一体に組
み込んだものが多く小形化が非常に難しい、しかも高価
である。発生した渦の大きさによりそのエネルギーの大
きさが違い小流量では小さなエネルギーになりその渦を
検出する事が難しい。本発明は流量計の口径の大小によ
らず製作が可能で又極めて小さな流量を簡単に測定でき
る流量計を製作する事が目的である。The conventional vortex type flowmeter described in the section of the prior art often incorporates a vortex generation mechanism and a detection mechanism in one body, and it is very difficult to miniaturize it, and it is expensive. The magnitude of the energy varies depending on the size of the generated vortex, and the energy becomes small at a small flow rate, making it difficult to detect the vortex. It is an object of the present invention to manufacture a flow meter which can be manufactured regardless of the size of the flow meter and which can easily measure an extremely small flow rate.

【０００４】[0004]

【課題を解決する為の手段】渦発生機構は従来と同じで
流路内に発生器を挿入、カルマン渦を発生させる。渦発
生器の流路後方に渦に追従して振動する為の球を挿入、
球は面積式流量計の原理と同じ理由で流体中に浮上す
る。流体中に浮游した球は摩擦が無い為、渦に連れ振動
しやすい。しかも流体中に浮游した球の振動は検出を容
易にする。The vortex generating mechanism is the same as the conventional one, and a generator is inserted in the flow path to generate a Karman vortex. Insert a sphere behind the flow path of the vortex generator to follow the vortex and vibrate.
The sphere floats in the fluid for the same reason as the principle of the area flow meter. The sphere floating in the fluid has no friction, so it tends to vibrate with the vortex. Moreover, the vibration of the sphere floating in the fluid facilitates detection.

【０００５】[0005]

【作用】図１の如く挿入された球は面積式流量計の原理
と同じ理由で流体中に浮き上がるので抵抗無く渦に連れ
て振動する。球の動きを検出しその振動数を測定すれば
流量を知ることが出来る。又微小流量も容易に測定でき
る。The sphere inserted as shown in FIG. 1 floats in the fluid for the same reason as the principle of the area type flow meter, so that it vibrates with a vortex without resistance. The flow rate can be known by detecting the movement of the sphere and measuring its frequency. Also, a minute flow rate can be easily measured.

【０００６】[0006]

【実施例】図１の如く流路４を垂直に立てたパイプ内に
流速に正比例して渦２を流路６内に発生させる渦発生器
１とその後方流路７に渦２の動きに正確に追従する球５
を挿入する。図１では渦発生器１が円柱になっているが
三角柱状の形状でも良い。球５は内径が急拡大されたパ
イプ７と渦２の発生器を持った流路６の間に設置されて
いるので、球５の重量と流速から流速が一定以上になっ
た時、面積式流量計の原理と同じ理由で流体中に浮上す
る。浮上した球５は流体以外のものと接触が断たれて機
械的な摩擦が無くなる。球５は摩擦が無く過応答が無い
限り渦２に追従して振動する事になる。流体を流し、球
５の振動数を測定すれば精度良く流量値を知ることが出
来る。図２は同じく図１，の状態を立体図として見た所
である。EXAMPLE A vortex generator 1 for generating a vortex 2 in a channel 6 in direct proportion to a flow velocity in a pipe in which a channel 4 is vertically set up as shown in FIG. Sphere 5 that follows accurately
Insert. In FIG. 1, the vortex generator 1 has a cylindrical shape, but it may have a triangular prism shape. Since the sphere 5 is installed between the pipe 7 whose inner diameter is suddenly expanded and the flow path 6 having the generator of the vortex 2, when the flow velocity becomes higher than a certain value from the weight and flow velocity of the sphere 5, the area equation It floats in the fluid for the same reason as the principle of the flow meter. The floating sphere 5 loses its mechanical friction because its contact with anything other than fluid is cut off. The sphere 5 follows the vortex 2 and vibrates as long as there is no friction and no excessive response. By flowing a fluid and measuring the frequency of the sphere 5, the flow rate value can be known with high accuracy. FIG. 2 is a perspective view of the state of FIG. 1 as well.

【０００７】[0007]

【発明の効果】この発明は、小さな流速でも充分、渦を
球の振動として発生させる事ができしかも振幅が大きい
ので検出を容易にする。According to the present invention, the vortex can be sufficiently generated as the vibration of the sphere even with a small flow velocity, and the amplitude is large, which facilitates the detection.

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

【図１】 二っの内径が異なる流路内に渦発生器と球を
設置した断面図。FIG. 1 is a cross-sectional view in which a vortex generator and a sphere are installed in two channels having different inner diameters.

【図２】 図１の立面図。FIG. 2 is an elevation view of FIG.

【符号の説明】[Explanation of symbols]

１……渦発生器 ２……渦 ３……渦検出器 ４……流路（パイプ等） ５……球 ６……渦発生器を備えた流路 ７……拡大後の流路 1 ... Vortex generator 2 ... Vortex 3 ... Vortex detector 4 ... Flow path (pipe etc.) 5 ... Sphere 6 ... Flow path equipped with vortex generator 7 ... Flow path after expansion

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】渦発生機構を設けた流路（６）を垂直に立
て、その直後の急拡大された流路（７）との間に何等固
定されない球（５）又は円錐状フロートを設置し流体中
に浮上させ、渦に自由に追従する球又はフロートの振動
を測定することにより流速を知る装置。1. A flow path (6) provided with a vortex generating mechanism is erected vertically, and a sphere (5) or a conical float that is not fixed at all is installed between the flow path (7) and the flow path (7) that is immediately expanded. A device that knows the flow velocity by measuring the vibration of a sphere or float that floats in a fluid and freely follows a vortex.