JPH09113324A - Vortex flowmeter - Google Patents
Vortex flowmeterInfo
- Publication number
- JPH09113324A JPH09113324A JP7291949A JP29194995A JPH09113324A JP H09113324 A JPH09113324 A JP H09113324A JP 7291949 A JP7291949 A JP 7291949A JP 29194995 A JP29194995 A JP 29194995A JP H09113324 A JPH09113324 A JP H09113324A
- Authority
- JP
- Japan
- Prior art keywords
- vortex
- heat ray
- flow rate
- attached
- flow path
- 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
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は渦式流量計に関し、特
に、流れによって発生した渦数を精度良く測定すること
のできる渦流量計に関する。渦式流量計は周知の通り、
流路に設けた渦発生体を流体が通過する際に生じるカル
マン渦数を検出して、流体流速あるいは通過流量を換算
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vortex flowmeter, and more particularly to a vortex flowmeter capable of accurately measuring the number of vortices generated by a flow. As is well known, the vortex flowmeter,
The Karman vortex number generated when a fluid passes through the vortex generator provided in the flow path is detected, and the fluid flow velocity or the passing flow rate is converted.
【0002】[0002]
【従来の技術】従来の渦式流量計として例えば特開平6
−34417号公報に示されているようなものが用いら
れていた。これは、渦発生体の上部に渦検出手段として
の振動センサ―を取り付けると共に、渦発生体の前方部
に熱線式流量センサ―を取り付けて、通常の流量の場合
は渦発生体で発生した渦数を振動センサ―で検出して測
定すると共に、微少流量の場合は熱線式流量センサ―で
流量を測定するものである。2. Description of the Related Art As a conventional vortex type flow meter, for example, Japanese Patent Laid-Open No.
The one disclosed in Japanese Laid-Open Patent Publication No. 34417/1994 was used. This is because a vibration sensor as a vortex detecting means is attached to the upper part of the vortex generator, and a hot wire type flow sensor is attached to the front part of the vortex generator so that the vortex generated by the vortex generator is normal when the flow rate is normal. The number is measured by the vibration sensor and the flow rate is measured by the hot wire type flow sensor when the flow rate is very small.
【0003】[0003]
【発明が解決しようとする課題】上記従来のものでは、
微少流量でも測定することができて流量計としてのレン
ジャビリティを広くすることができるが、流量計の取り
付けられた装置等の外乱による振動の影響を受けて渦数
を正確に検出することができず、従って、流量も精度良
く測定できない問題があった。SUMMARY OF THE INVENTION In the above prior art,
It is possible to measure even a minute flow rate and widen the rangeability as a flow meter, but it is possible to accurately detect the number of vortices under the influence of vibration due to disturbance of the device with the flow meter attached. Therefore, there is a problem that the flow rate cannot be accurately measured.
【0004】流量計は通常、測定流体が流下する配管中
に取り付けられることが多く、その配管そのものからの
振動や、あるいは、配管の接続している各種装置から伝
わってきた振動等が伝達し易く、渦検出手段としての振
動センサ―が誤検知する場合が多いのである。A flow meter is usually mounted in a pipe through which a fluid to be measured flows down, and vibrations from the pipe itself or vibrations transmitted from various devices connected to the pipe are easily transmitted. In many cases, the vibration sensor as the vortex detecting means makes an erroneous detection.
【0005】従って本発明の技術的課題は、外乱として
の振動が伝達し易い場所に取り付けられても精度良く流
量を測定することのできる渦流量計を得ることである。Therefore, a technical object of the present invention is to obtain a vortex flowmeter capable of measuring a flow rate with high accuracy even if the vortex flowmeter is attached to a place where vibration as a disturbance is easily transmitted.
【0006】[0006]
【課題を解決するための手段】本発明の渦流量計の技術
的手段は、測定流体の流れる流路に渦発生体と渦検出手
段を設けて流路を通過する流量を測定するものにおい
て、渦発生体の下流側に渦検出手段としての熱線センサ
―を取り付け、当該熱線センサ―からの信号により上記
流路で発生する渦数を検出して、当該渦数から流量を演
算する演算部を設けたものである。The technical means of the vortex flowmeter of the present invention is to provide a vortex generator and a vortex detecting means in the flow path of a measurement fluid to measure the flow rate passing through the flow path. A heat ray sensor as a vortex detecting means is attached on the downstream side of the vortex generator, and a calculation unit for calculating the flow rate from the vortex number is detected by detecting the number of vortices generated in the flow path by the signal from the heat ray sensor. It is provided.
【0007】[0007]
【作用】上記の技術的手段の作用は下記の通りである。
渦発生体で発生した渦は下流の熱線センサ―へ至り、熱
線センサ―からの放散熱量に変化を生じることにより渦
が検出される。渦数を下流側に取り付けた熱線センサ―
で検出することにより、振動センサ―で検出する従来例
のように、外乱による振動の影響を受けることなく渦数
を検出することができる。The operation of the above technical means is as follows.
The vortex generated by the vortex generator reaches the downstream heat ray sensor, and the vortex is detected by changing the amount of heat radiated from the heat ray sensor. Heat ray sensor with vortex number attached downstream
By detecting with, it is possible to detect the number of vortices without being affected by vibration due to disturbance, as in the conventional example of detecting with a vibration sensor.
【0008】[0008]
【実施例】上記の技術的手段の具体例を示す実施例を説
明する。流量計本体1内に流路2を形成し、中央部に渦
発生体3を設ける。図1においては図面の手前から渦発
生体3を経て後面へ流体が流下するものである。渦発生
体3は上流側を底面とした二等辺三角柱とする。渦発生
体3の下流側すなわち後面に渦検出手段としての熱線セ
ンサ―4,5を取り付ける。熱線センサ―4,5は細線
状の伝熱線を矩形状にして、渦発生体3の中心軸の左右
に対象に取り付ける。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described. The flow path 2 is formed in the flowmeter main body 1, and the vortex generator 3 is provided in the central portion. In FIG. 1, the fluid flows from the front of the drawing to the rear surface through the vortex generator 3. The vortex generator 3 is an isosceles triangular prism having a bottom surface on the upstream side. On the downstream side of the vortex generator 3, that is, on the rear surface, heat ray sensors 4 and 5 as vortex detecting means are attached. The heat wire sensors 4 and 5 have thin heat transfer wires in a rectangular shape and are attached to the left and right sides of the central axis of the vortex generator 3.
【0009】本体1の上部に演算部6を配置して熱線セ
ンサ―4,5からの信号を演算部6内の図示しない比較
部、増幅部、電圧・電流変換部等を経て流量換算部と接
続する。An arithmetic unit 6 is arranged on the upper part of the main body 1, and signals from the heat ray sensors 4, 5 are converted into a flow rate conversion unit via an unillustrated comparison unit, amplification unit, voltage / current conversion unit and the like in the arithmetic unit 6. Connecting.
【0010】次に作用を説明する。流路2内を流体が流
下すると渦発生体3の下流側にカルマン渦を発生し、熱
線センサ―4,5の放散熱量が変化することによって渦
数が検出される。演算部6で、その渦数と流路2の断面
積や流体の比重量等から通過流量を換算し表示等を行
う。Next, the operation will be described. When the fluid flows down in the flow path 2, a Karman vortex is generated on the downstream side of the vortex generator 3, and the radiated heat amount of the heat ray sensors 4 and 5 changes, so that the vortex number is detected. The calculation unit 6 converts the flow rate of the passage from the number of vortices, the cross-sectional area of the flow path 2 and the specific weight of the fluid, and displays the converted flow rate.
【0011】[0011]
【発明の効果】上記のように本発明によれば、熱線セン
サ―で渦を検出することにより、外乱による振動の影響
を受けることがなく、従って、正確に渦数を検出して精
度良く流量を測定することができる。As described above, according to the present invention, since the vortex is detected by the heat ray sensor, it is not affected by the vibration due to the disturbance. Therefore, the vortex number can be accurately detected and the flow rate can be accurately measured. Can be measured.
【図1】本発明の渦流量計の実施例の外観図である。FIG. 1 is an external view of an embodiment of a vortex flowmeter of the present invention.
1 流量計本体 2 流路 3 渦発生体 4,5 熱線センサ― 6 演算部 1 Flowmeter main body 2 Flow path 3 Vortex generator 4,5 Heat ray sensor-6 Calculation unit
Claims (1)
出手段を設けて流路を通過する流量を測定するものにお
いて、渦発生体の下流側に渦検出手段としての熱線セン
サ―を取り付け、当該熱線センサ―からの信号により上
記流路で発生する渦数を検出して、当該渦数から流量を
演算する演算部を設けた渦流量計。1. A vortex generator and a vortex detecting means are provided in a flow path of a measurement fluid to measure a flow rate passing through the flow path, wherein a heat ray sensor as a vortex detecting means is provided downstream of the vortex generator. A vortex flowmeter provided with an arithmetic unit that is attached and detects the number of vortices generated in the flow path by a signal from the heat ray sensor and calculates the flow rate from the number of vortices.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7291949A JPH09113324A (en) | 1995-10-13 | 1995-10-13 | Vortex flowmeter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7291949A JPH09113324A (en) | 1995-10-13 | 1995-10-13 | Vortex flowmeter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09113324A true JPH09113324A (en) | 1997-05-02 |
Family
ID=17775552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7291949A Pending JPH09113324A (en) | 1995-10-13 | 1995-10-13 | Vortex flowmeter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH09113324A (en) |
-
1995
- 1995-10-13 JP JP7291949A patent/JPH09113324A/en active Pending
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