JP3121735B2 - Bidirectional flow measurement method and device - Google Patents
Bidirectional flow measurement method and deviceInfo
- Publication number
- JP3121735B2 JP3121735B2 JP06312288A JP31228894A JP3121735B2 JP 3121735 B2 JP3121735 B2 JP 3121735B2 JP 06312288 A JP06312288 A JP 06312288A JP 31228894 A JP31228894 A JP 31228894A JP 3121735 B2 JP3121735 B2 JP 3121735B2
- Authority
- JP
- Japan
- Prior art keywords
- differential pressure
- opening
- signal
- value
- flow
- 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 - Fee Related
Links
Landscapes
- Measuring Volume Flow (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、流体が正逆双方向に流
れる管路における流量計測に係り、双後方流量計測方法
およびその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow measurement in a pipe in which a fluid flows in both forward and reverse directions, and more particularly to a method and a device for measuring a flow rate in a backward direction.
【０００２】[0002]
【従来の技術】従来、管路の途中に介装したバルブにお
ける流量を計測する場合には、バルブの開度と各開度に
おける流路断面積の大きさとの関係を予め求めておき、
差圧計測手段によりバルブの前後における管路内の流体
の差圧を測定し、測定した差圧値と測定時におけるバル
ブの開度に呼応する流路断面積とに基づいて流量を計測
していた。2. Description of the Related Art Conventionally, when measuring the flow rate of a valve interposed in the middle of a pipeline, the relationship between the opening degree of the valve and the size of the flow path cross-sectional area at each opening degree is obtained in advance.
The differential pressure measuring means measures the differential pressure of the fluid in the pipe before and after the valve, and measures the flow rate based on the measured differential pressure value and the flow path cross-sectional area corresponding to the valve opening during the measurement. Was.
【０００３】[0003]
【発明が解決しようとする課題】上記した構成におい
て、差圧計測手段をなすものとして差圧発信器がある。
従来の差圧発信器は差圧の大きさに応じた正の信号値を
もつアナログ信号を発信するものであるために、管路を
流体が双方向に流れる場合には、正流方向に対応する差
圧発信器と逆流方向に対応する差圧発信器とを設ける必
要あり、装置構成に無駄があった。In the above arrangement, there is a differential pressure transmitter as a means for measuring the differential pressure.
Since the conventional differential pressure transmitter transmits an analog signal with a positive signal value according to the magnitude of the differential pressure, it corresponds to the positive flow direction when fluid flows in both directions in the pipeline. Therefore, it is necessary to provide a differential pressure transmitter which performs the reverse flow and a differential pressure transmitter which corresponds to the reverse flow direction, resulting in waste of the device configuration.
【０００４】本発明は上記した課題を解決するもので、
差圧計測手段として１台の差圧発信器を使用しながら
も、正逆双方向の流れにおいて流量を計測することがで
きる双方向流量計測方法およびその装置を提供すること
を目的とする。The present invention solves the above-mentioned problems, and
It is an object of the present invention to provide a bidirectional flow measurement method and a bidirectional flow measurement method capable of measuring a flow in a forward / reverse bidirectional flow while using one differential pressure transmitter as a differential pressure measuring means.
【０００５】[0005]
【課題を解決するための手段】上記した課題を解決する
ために、本発明の双方向流量計測方法は、流体が正逆双
方向に流れる管路において、管路の途中に介装したバル
ブを境とする両側部間の差圧を差圧発信器により計測
し、差圧発信器から差圧の大きさに応じた信号値の差圧
信号を、正流時に正レンジにおける信号値として逆流時
に負レンジにおける信号値として発信し、差圧信号を受
けて差圧値演算回路において差圧値を算出するととも
に、算出した差圧値を符号付差圧値データとして出力
し、バルブの開度を開度発信器により計測し、開度発信
器から開度の大きさに応じた信号値の開度信号を発信
し、開度信号を受けて損失係数値演算回路において開度
に相応する損失係数値を算出するとともに、算出した損
失係数値を損失係数値データとして出力し、符号付差圧
値データを受けて流れ方向判別回路において管路におけ
る流れ方向を判別し、流れ方向判別回路を経た符号付差
圧値データと損失係数値データとを受けて流量演算回路
において現在開度における流量を算出する構成としたも
のである。In order to solve the above-mentioned problems, a two-way flow rate measuring method according to the present invention is directed to a valve in which a fluid is interposed in a pipe flowing in both directions. The differential pressure between the two sides as the boundary is measured by the differential pressure transmitter, and the differential pressure signal of the signal value corresponding to the magnitude of the differential pressure is output from the differential pressure transmitter as Transmits the signal as a signal value in the negative range, receives the differential pressure signal, calculates the differential pressure value in the differential pressure value calculation circuit, outputs the calculated differential pressure value as signed differential pressure value data, and determines the valve opening. An opening signal is measured by the opening transmitter, an opening signal having a signal value corresponding to the opening is transmitted from the opening transmitter, and the loss signal corresponding to the opening is received by the loss coefficient value calculation circuit in response to the opening signal. Calculate the numerical values and save the calculated loss factor value in the loss factor value data. The flow direction calculation circuit receives the signed differential pressure value data, determines the flow direction in the pipeline in the flow direction determination circuit, receives the signed differential pressure value data and the loss coefficient value data that have passed through the flow direction determination circuit, and calculates the flow rate. The circuit is configured to calculate the flow rate at the current opening.
【０００６】本発明の双方向流量計測装置は、正負の測
定レンジを有し、バルブを介装した管路に接続しバルブ
を境とする管路の両側部間の差圧を計測して差圧の大き
さに応じた信号値の差圧信号を発信する差圧発信器と、
バルブに接続しバルブの開度を計測して開度の大きさに
応じた信号値の開度信号を発信する開度発信器と、差圧
発信器と開度発信器に接続した流量計測演算装置とを備
え、流量計測演算装置が、前記差圧信号に基づいて差圧
値を算出するとともに、算出した差圧値を符号付差圧値
データとして出力する差圧値演算回路と、前記開度信号
に基づいて開度に相応する損失係数値を算出するととも
に、算出した損失係数値を損失係数値データとして出力
する損失係数値演算回路と、前記符号付差圧値データに
基づいて管路における流れ方向を判別する流れ方向判別
回路と、前記符号付差圧値データと前記損失係数値デー
タとに基づいて現在開度における流量を算出する流量演
算回路とを有する構成としたものである。The bidirectional flow rate measuring device of the present invention has a positive / negative measuring range, is connected to a pipe with a valve interposed, and measures a differential pressure between both sides of the pipe bordering the valve. A differential pressure transmitter for transmitting a differential pressure signal having a signal value corresponding to the magnitude of the pressure,
An opening transmitter that connects to a valve to measure the opening of the valve and sends an opening signal with a signal value according to the opening, and a flow measurement calculation connected to the differential pressure transmitter and the opening transmitter A differential pressure value calculation circuit that calculates a differential pressure value based on the differential pressure signal, and outputs the calculated differential pressure value as signed differential pressure value data. A loss coefficient value calculation circuit that calculates a loss coefficient value corresponding to the opening degree based on the degree signal, and outputs the calculated loss coefficient value as loss coefficient value data; and a pipeline based on the signed differential pressure value data. And a flow rate calculation circuit for calculating a flow rate at the current opening based on the signed differential pressure value data and the loss coefficient value data.
【０００７】[0007]
【作用】上記した構成により、差圧発信器は流体が管路
内を何れの方向に流れようともバルブを境とする管路の
両側部間の差圧を検出するので、一台の差圧発信器によ
って正逆双方向に流れる流体の流量を計測することがで
きる。With the above arrangement, the differential pressure transmitter detects the differential pressure between the two sides of the pipe line bordering the valve regardless of the direction in which the fluid flows in the pipe line. The transmitter can measure the flow rate of the fluid flowing in the forward and reverse directions.
【０００８】[0008]
【実施例】以下、本発明の一実施例を図面に基づいて説
明する。図１は本実施例における流量計測装置の構成を
示す模式図である。図１において、管路１の途中にはバ
ルブ２が介装してあり、バルブ２は開度の変化に対する
流量の変化が比較的線形な特性を示すものである。バル
ブ２の駆動装置３に接続して開度発信器４が設けてあ
り、開度発信器４はバルブ２の開度を計測して開度の大
きさに応じた信号値の開度信号（アナログ信号）を発信
するものである。差圧発信器５はバルブ２を境とする管
路１の両側部に接続して設けてあり、差圧発信器５は管
路１の両側部間の差圧を計測して差圧の大きさに応じて
信号値の差圧信号を発信するものである。差圧発信器５
は測定レンジとして正負のフルスケールを有し、正流時
に正レンジにおける信号値の差圧信号を発信し、逆流時
に負レンジにおける信号値の差圧信号を発信する。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram illustrating a configuration of a flow rate measuring device according to the present embodiment. In FIG. 1, a valve 2 is interposed in the middle of a pipeline 1, and the valve 2 has a relatively linear characteristic in which a change in the flow rate with respect to a change in the opening degree is relatively linear. An opening transmitter 4 is provided in connection with the driving device 3 of the valve 2, and the opening transmitter 4 measures the opening of the valve 2 and outputs an opening signal (a signal value corresponding to the magnitude of the opening). Analog signal). The differential pressure transmitter 5 is connected to both sides of the pipe 1 with the valve 2 as a boundary, and the differential pressure transmitter 5 measures the differential pressure between both sides of the pipe 1 and measures the magnitude of the differential pressure. A differential pressure signal having a signal value is transmitted accordingly. Differential pressure transmitter 5
Has a positive / negative full scale as a measurement range, transmits a differential pressure signal having a signal value in the positive range at the time of positive flow, and transmits a differential pressure signal of a signal value at the negative range at the time of reverse flow.
【０００９】開度発信器４と差圧発信器５とに接続した
流量計測演算装置６は、プログラム等により形成する各
種の機能回路を備えており、機能回路としては差圧値演
算回路７、損失係数値演算回路８、流れ方向判別回路
９、流量演算回路１０がある。The flow rate measuring and calculating device 6 connected to the opening degree transmitter 4 and the differential pressure transmitter 5 has various functional circuits formed by programs and the like. There are a loss coefficient value calculation circuit 8, a flow direction determination circuit 9, and a flow rate calculation circuit 10.
【００１０】差圧値演算回路７は、差圧発信器５から発
信する差圧信号に基づいて差圧値を算出するとともに、
算出した差圧値を符号付差圧値データとして出力する機
能を担っている。損失係数値演算回路８は、開度発信器
４から発信する開度信号に基づいて開度に相応する損失
係数値を算出するとともに、算出した損失係数値を損失
係数値データとして出力する機能を担っている。流れ方
向判別回路９は、差圧値演算回路７から出力する符号付
差圧値データに基づいて管路１において流れ方向を判別
する機能を担っている。流量演算回路１０は、符号付差
圧値データと損失係数値データとに基づいて現在開度に
おける流量を算出する機能を担っており、差圧値と損失
係数値とから流速を求めるとともに、予め設定しておい
た各開度における流路断面積と流速の乗算によって流量
を算出するものである。The differential pressure value calculation circuit 7 calculates a differential pressure value based on a differential pressure signal transmitted from the differential pressure transmitter 5,
It has a function of outputting the calculated differential pressure value as signed differential pressure value data. The loss coefficient value calculation circuit 8 has a function of calculating a loss coefficient value corresponding to the opening based on the opening signal transmitted from the opening transmitter 4 and outputting the calculated loss coefficient value as loss coefficient value data. I am carrying it. The flow direction determination circuit 9 has a function of determining the flow direction in the pipeline 1 based on the signed differential pressure value data output from the differential pressure value calculation circuit 7. The flow rate calculation circuit 10 has a function of calculating the flow rate at the current opening based on the signed differential pressure value data and the loss coefficient value data, and calculates the flow velocity from the differential pressure value and the loss coefficient value, and The flow rate is calculated by multiplying the flow area and the flow velocity at each set opening degree.
【００１１】以下、上記した構成における作用を説明す
る。流体が管路１内を正逆何れかの方向に流れる状態に
おいて、差圧発信器５によりバルブ２を境とする管路１
の両側部間の差圧を計測し、差圧発信器５から差圧値演
算回路７へ差圧の大きさに応じた信号値の差圧信号を送
信する。このとき、管路１における流れが正流であれば
差圧信号は正レンジにおける信号値をなし、管路１にお
ける流れが逆流であれば差圧信号は負レンジにおける信
号値をなす。一方、バルブ２の開度を開度発信器４によ
り計測し、開度発信器４から損失係数値演算回路８へ開
度の大きさに応じた信号値の開度信号を送信する。The operation of the above configuration will be described below. In a state in which the fluid flows in the pipe 1 in either the forward or reverse direction, the pipe 1 is separated from the valve 2 by the differential pressure transmitter 5.
, A differential pressure signal having a signal value corresponding to the magnitude of the differential pressure is transmitted from the differential pressure transmitter 5 to the differential pressure value calculation circuit 7. At this time, if the flow in the pipe 1 is a positive flow, the differential pressure signal has a signal value in a positive range, and if the flow in the pipe 1 is a reverse flow, the differential pressure signal has a signal value in a negative range. On the other hand, the opening degree of the valve 2 is measured by the opening degree transmitter 4, and an opening degree signal having a signal value corresponding to the degree of the opening degree is transmitted from the opening degree transmitter 4 to the loss coefficient value calculation circuit 8.
【００１２】次に、差圧値演算回路７において差圧信号
を受けて差圧値を算出するとともに、算出した差圧値を
符号付差圧値データとして流れ方向判別回路９へ出力
し、流れ方向判別回路９において符号付差圧値データを
受けて管路１における流れ方向を判別する。一方、損失
係数値演算回路８において開度信号を受けて開度に相応
する損失係数値を算出するとともに、算出した損失係数
値を損失係数値データとして流量演算回路１０に送信す
る。次に、流量演算回路１０は、流れ方向判別回路９を
経て入力される符号付差圧値データと損失係数値データ
とを受けて現在開度における流量を算出する。Next, the differential pressure value calculating circuit 7 receives the differential pressure signal, calculates the differential pressure value, and outputs the calculated differential pressure value to the flow direction discriminating circuit 9 as signed differential pressure value data. The direction determining circuit 9 receives the signed differential pressure value data and determines the flow direction in the pipeline 1. On the other hand, the loss coefficient value calculation circuit 8 receives the opening signal, calculates a loss coefficient value corresponding to the opening, and transmits the calculated loss coefficient value to the flow rate calculation circuit 10 as loss coefficient value data. Next, the flow rate calculation circuit 10 receives the signed differential pressure value data and the loss coefficient value data input through the flow direction determination circuit 9 and calculates the flow rate at the current opening.
【００１３】[0013]
【発明の効果】以上述べたように本発明によれば、差圧
発信器は流体が管路内を何れの方向に流れようともバル
ブを境とする管路の両側部間の差圧を検出するので、一
台の差圧発信器によって正逆双方向に流れる流体の流量
を計測することができる。As described above, according to the present invention, a differential pressure transmitter detects a differential pressure between both sides of a pipe bordering a valve, regardless of the direction in which fluid flows in the pipe. Therefore, the flow rate of the fluid flowing in the forward and reverse directions can be measured by one differential pressure transmitter.
【図１】本発明の一実施例における流量計測装置の構成
を示す模式図である。FIG. 1 is a schematic diagram showing a configuration of a flow measurement device according to an embodiment of the present invention.
１ 管路 ２ バルブ ４ 開度発信器 ５ 差圧発信器 ６ 流量計測演算装置 ７ 差圧値演算回路 ８ 損失係数値演算回路 ９ 流れ方向判別回路 １０ 流量演算回路 DESCRIPTION OF SYMBOLS 1 Pipeline 2 Valve 4 Opening transmitter 5 Differential pressure transmitter 6 Flow rate measuring and calculating device 7 Differential pressure value calculating circuit 8 Loss coefficient value calculating circuit 9 Flow direction discriminating circuit 10 Flow rate calculating circuit
Claims (2)
て、管路の途中に介装したバルブを境とする両側部間の
差圧を差圧発信器により計測し、差圧発信器から差圧の
大きさに応じた信号値の差圧信号を、正流時に正レンジ
における信号値として逆流時に負レンジにおける信号値
として発信し、差圧信号を受けて差圧値演算回路におい
て差圧値を算出するとともに、算出した差圧値を符号付
差圧値データとして出力し、バルブの開度を開度発信器
により計測し、開度発信器から開度の大きさに応じた信
号値の開度信号を発信し、開度信号を受けて損失係数値
演算回路において開度に相応する損失係数値を算出する
とともに、算出した損失係数値を損失係数値データとし
て出力し、符号付差圧値データを受けて流れ方向判別回
路において管路における流れ方向を判別し、流れ方向判
別回路を経た符号付差圧値データと損失係数値データと
を受けて流量演算回路において現在開度における流量を
算出することを特徴とする双方向流量計測方法。In a pipeline in which fluid flows in both forward and reverse directions, a differential pressure transmitter measures a differential pressure between both sides of a valve disposed in the middle of the conduit. A differential pressure signal having a signal value corresponding to the magnitude of the differential pressure is transmitted as a signal value in a positive range during a positive flow and as a signal value in a negative range during a reverse flow. While calculating the value, the calculated differential pressure value is output as signed differential pressure value data, the opening of the valve is measured by the opening transmitter, and the signal value corresponding to the magnitude of the opening is transmitted from the opening transmitter. In response to the opening signal, the loss signal value calculation circuit calculates a loss coefficient value corresponding to the opening in response to the opening signal, outputs the calculated loss coefficient value as loss coefficient value data, and outputs a signed difference. In the flow direction discriminating circuit, receiving pressure value data A flow direction at a current opening in a flow rate calculation circuit in response to signed differential pressure value data and loss coefficient value data passed through a flow direction determination circuit. .
した管路に接続しバルブを境とする管路の両側部間の差
圧を計測して差圧の大きさに応じた信号値の差圧信号を
発信する差圧発信器と、バルブに接続しバルブの開度を
計測して開度の大きさに応じた信号値の開度信号を発信
する開度発信器と、差圧発信器と開度発信器に接続した
流量計測演算装置とを備え、流量計測演算装置が、前記
差圧信号に基づいて差圧値を算出するとともに、算出し
た差圧値を符号付差圧値データとして出力する差圧値演
算回路と、前記開度信号に基づいて開度に相応する損失
係数値を算出するとともに、算出した損失係数値を損失
係数値データとして出力する損失係数値演算回路と、前
記符号付差圧値データに基づいて管路における流れ方向
を判別する流れ方向判別回路と、前記符号付差圧値デー
タと前記損失係数値データとに基づいて現在開度におけ
る流量を算出する流量演算回路とを有することを特徴と
する双方向流量計測装置。2. A signal according to the magnitude of the differential pressure, which has a positive / negative measurement range, is connected to a pipe with a valve interposed, measures a differential pressure between both sides of the pipe bordering the valve, and measures the differential pressure. A differential pressure transmitter that transmits a differential pressure signal of a value, an opening transmitter that is connected to a valve, measures the opening of the valve, and transmits an opening signal of a signal value corresponding to the magnitude of the opening, A flow measuring and calculating device connected to the pressure transmitting device and the opening degree transmitting device, wherein the flow measuring and calculating device calculates a differential pressure value based on the differential pressure signal, and converts the calculated differential pressure value to a signed differential pressure value. A differential pressure value calculation circuit for outputting value data, a loss coefficient value calculation circuit for calculating a loss coefficient value corresponding to the opening based on the opening signal, and outputting the calculated loss coefficient value as loss coefficient value data And a flow direction for determining a flow direction in the pipeline based on the signed differential pressure value data. A bidirectional flow measurement device, comprising: a determination circuit; and a flow calculation circuit that calculates a flow at the current opening based on the signed differential pressure value data and the loss coefficient value data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06312288A JP3121735B2 (en) | 1994-12-16 | 1994-12-16 | Bidirectional flow measurement method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06312288A JP3121735B2 (en) | 1994-12-16 | 1994-12-16 | Bidirectional flow measurement method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08166265A JPH08166265A (en) | 1996-06-25 |
| JP3121735B2 true JP3121735B2 (en) | 2001-01-09 |
Family
ID=18027451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06312288A Expired - Fee Related JP3121735B2 (en) | 1994-12-16 | 1994-12-16 | Bidirectional flow measurement method and device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3121735B2 (en) |
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| JP5761960B2 (en) * | 2010-10-29 | 2015-08-12 | 三菱重工業株式会社 | Heat source equipment |
| CN103364044A (en) * | 2013-06-26 | 2013-10-23 | 宁波钢铁有限公司 | Full-range measurement method and device for diffusion capacity of gas chamber |
| CN104236640B (en) * | 2014-08-22 | 2018-05-04 | 承德承钢工程技术有限公司 | Gas flow method is measured indirectly using the flow control valve of installation in the duct |
-
1994
- 1994-12-16 JP JP06312288A patent/JP3121735B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9472867B2 (en) | 2013-03-27 | 2016-10-18 | Enplas Corporation | Electric contact and electric component socket |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08166265A (en) | 1996-06-25 |
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