JPH0650782A - Flowmeter - Google Patents
FlowmeterInfo
- Publication number
- JPH0650782A JPH0650782A JP4222232A JP22223292A JPH0650782A JP H0650782 A JPH0650782 A JP H0650782A JP 4222232 A JP4222232 A JP 4222232A JP 22223292 A JP22223292 A JP 22223292A JP H0650782 A JPH0650782 A JP H0650782A
- Authority
- JP
- Japan
- Prior art keywords
- water level
- pressure type
- level
- level sensor
- signal
- 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
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、開水路などを流れる
水などの流体の流量を、圧力式水位センサを用いて計測
する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 flow meter for measuring the flow rate of a fluid such as water flowing through an open water channel by using a pressure type water level sensor.
【０００２】[0002]
【従来の技術】図６は従来の流量計を示し、図におい
て、１は開水路の途中に設置するパーマボーラスフリュ
ームなどの絞り機構、２は水位を測定する圧力式水位セ
ンサ、３は圧力式水位センサ２にて測定した水位信号を
流量信号に変換する水位／流量演算器である。2. Description of the Related Art FIG. 6 shows a conventional flow meter, in which 1 is a throttle mechanism such as a permabolus flume installed in the middle of an open channel, 2 is a pressure type water level sensor for measuring the water level, and 3 is a pressure type. It is a water level / flow rate calculator that converts a water level signal measured by the water level sensor 2 into a flow rate signal.
【０００３】次に動作について説明する。開水路を矢印
の方向に流れてきた水などの流体は、その開水路の途中
に設置された絞り機構１によって絞られ、限界流が発生
する。この時、絞り機構１の上流側に発生する水位を、
水路底に置いた圧力式水位センサ２によって測定する。Next, the operation will be described. A fluid such as water flowing in the direction of the arrow in the open water channel is throttled by the throttling mechanism 1 installed in the middle of the open water channel, and a limit flow is generated. At this time, the water level generated on the upstream side of the throttling mechanism 1 is
It is measured by the pressure type water level sensor 2 placed at the bottom of the water channel.
【０００４】そこで、この測定した水位信号を、絞り機
構１の大きさや形状によって変化する水位／流量の変換
特性をメモリ等に内蔵した水位／流量演算器３を用いて
流量信号へと変換し、開水路を流れる水などの流体の量
を得る。Therefore, the measured water level signal is converted into a flow rate signal by using a water level / flow rate calculator 3 having a water level / flow rate conversion characteristic which changes depending on the size and shape of the throttle mechanism 1 in a memory or the like. Obtain the amount of fluid, such as water, flowing through an open channel.
【０００５】[0005]
【発明が解決しようとする課題】従来の流量計は以上の
ように構成されているので、使用する圧力式水位センサ
２が１台であり、さらにこれが水路底に置かれているた
めに、土砂などの堆積物によって圧力式水位センサ２が
おおわれてしまうと、その堆積物の重みが加算されてし
まい、正確な水位の測定が行われず、結果的に流量の測
定ができなくなってしまうなどの問題点があった。Since the conventional flowmeter is constructed as described above, only one pressure type water level sensor 2 is used, and since it is placed at the bottom of the water channel, the sediment If the pressure-type water level sensor 2 is covered by such a sediment, the weight of the sediment is added, the accurate water level cannot be measured, and as a result, the flow rate cannot be measured. There was a point.
【０００６】この発明は上記のような問題点を解消する
ためになされたものであり、圧力式水位センサを２台設
置することによって、堆積物の重みによる影響を取り除
いた水位信号を演算処理によって取り出し、正確な流量
を計測することができる流量計を得ることを目的とす
る。The present invention has been made in order to solve the above problems, and by installing two pressure type water level sensors, the water level signal from which the influence of the weight of the sediment is removed is calculated. The purpose is to obtain a flow meter that can be taken out and measure the accurate flow rate.
【０００７】[0007]
【課題を解決するための手段】この発明に係る流量計
は、水路底に設置した第１の圧力式水位センサと、該第
１の圧力式水位センサの近傍であって、上記水路底の堆
積物の重みの影響を受けない設定水位に設けられた第２
の圧力式水位センサと、流体が上記第２の圧力式水位セ
ンサを超えかつ水路底に堆積部がある場合は、該第２の
圧力式水位センサから水面までの距離および上記設定水
位を加算して実水位を求め、一方、上記流体が上記第２
の圧力式水位センサを下まわりかつ水路底に堆積物があ
る場合は、予め上記実水位と上記第１の圧力式水位セン
サから得た水位データとの誤差を補正値として、該補正
値を上記第１の圧力式水位センサから得た水位データか
ら差引いて水位を求める水位補正演算器とを備えて、水
位／流量演算器に、該水位補正演算器で求めた上記実水
位または水位を流量変換させるようにしたものである。SUMMARY OF THE INVENTION A flowmeter according to the present invention comprises a first pressure type water level sensor installed at the bottom of a water channel, and a deposit near the first pressure type water level sensor at the bottom of the water channel. The second set at the set water level that is not affected by the weight of objects
When the fluid exceeds the second pressure type water level sensor and there is a deposit at the bottom of the water channel, the distance from the second pressure type water level sensor to the water surface and the set water level are added. To obtain the actual water level, while the fluid is the second
When there is a deposit below the pressure type water level sensor and at the bottom of the water channel, the correction value is set to the error between the actual water level and the water level data obtained from the first pressure type water level sensor in advance. A water level correction calculator for subtracting the water level data obtained from the first pressure type water level sensor to obtain the water level is provided, and the actual water level or the water level obtained by the water level correction calculator is converted into a flow rate. It was made to let.
【０００８】[0008]
【作用】この発明における流量計は、水位補正演算器に
より、流体が第２の圧力式水位センサを超えかつ水路底
に堆積部があることを条件に、第２の圧力式水位センサ
から水面までの距離および堆積物の重みの影響を受けな
い設定水位を加算して実水位を求め、一方、流体が第２
の圧力式水位センサを下まわりかつ水路底に堆積物があ
る場合は、予め上記実水位と第１の圧力式水位センサか
ら得た水位データとの誤差を補正値として、該補正値を
上記第１の圧力式水位センサから得た水位データから差
引いて水位を求め、上記実水位またはその水位を水位／
流量演算器により流量変換して流量を求める。In the flowmeter according to the present invention, the water level correction calculator is used to provide a fluid from the second pressure type water level sensor to the water surface on condition that the fluid exceeds the second pressure type water level sensor and there is a deposit on the bottom of the water channel. The actual water level is calculated by adding the set water level that is not affected by the distance of
When there is a deposit below the pressure type water level sensor and at the bottom of the water channel, the error between the actual water level and the water level data obtained from the first pressure type water level sensor is set as a correction value, and the correction value is set to the above The water level is obtained by subtracting from the water level data obtained from the pressure type water level sensor of No. 1, and the actual water level or its water level is
Calculate the flow rate by converting the flow rate using the flow rate calculator.
【０００９】[0009]
実施例１．以下、この発明の一実施例を図について説明
する。図１において、１は開水路の途中に設置するパー
マボーラスフリュームなどの絞り機構、２は水位を測定
する第１の圧力式水位センサ、３は圧力式水位センサ２
にて測定した水位信号を流量信号に変換する水位／流量
演算器である。Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a throttle mechanism such as a permabolus flume installed in the middle of an open channel, 2 is a first pressure type water level sensor for measuring the water level, 3 is a pressure type water level sensor 2
It is a water level / flow rate calculator that converts the water level signal measured in 1. into a flow rate signal.
【００１０】また、２ａは補正用に設けた第２の圧力式
水位センサ、４はその第２の圧力式水位センサ２ａから
の水位信号Ｂと、水路底に置かれた第１の圧力式水位セ
ンサ２からの水位信号Ａとにもとづいて、正確な水位デ
ータを演算し、これを水位信号として出力するためのマ
イクロプロセッサを有する水位補正演算器である。Further, 2a is a second pressure type water level sensor provided for correction, and 4 is a water level signal B from the second pressure type water level sensor 2a and a first pressure type water level placed at the bottom of the water channel. A water level correction calculator having a microprocessor for calculating accurate water level data based on the water level signal A from the sensor 2 and outputting this as a water level signal.
【００１１】次に動作について説明する。まず、この開
水路流量計において、補正用の第２の圧力式水位センサ
２ａを第１の圧力式水位センサ２よりも高い位置、すな
わち水路底より浮かし、堆積物の影響を受けないところ
に設置する。Next, the operation will be described. First, in this open channel flow meter, the second pressure type water level sensor 2a for correction is installed at a position higher than the first pressure type water level sensor 2, that is, at a position above the bottom of the water channel and not affected by sediment. To do.
【００１２】図３のように、流体Ｒが補正用の第２の圧
力式水位センサ２ａを超える場合は、堆積物がないと
き、第１の圧力式水位センサ２からの水位信号Ａはその
ままの値ＬA となり、補正用の第２の圧力式水位センサ
２ａからの水位信号Ｂは、検出された水面までの水位デ
ータＬB に、浮かした既知の高さ分ＬO を加えた値のＬ
B ＋ＬO となる。つまり、実水位ＬはＬ＝ＬA として
も、Ｌ＝ＬB ＋ＬO としても求められる。As shown in FIG. 3, when the fluid R exceeds the second pressure type water level sensor 2a for correction, when there is no deposit, the water level signal A from the first pressure type water level sensor 2 remains unchanged. The value L A is obtained , and the water level signal B from the second pressure type water level sensor 2a for correction is the value L obtained by adding the known floating height L O to the detected water level data L B.
It becomes B + L O. In other words, the actual water level L is as L = L A, is also obtained as L = L B + L O.
【００１３】ところが、実際には図４に示すように堆積
物Ｓが存在するので、Ｌ＝ＬB ＋ＬO として求める水位
信号Ｂは、ＬO が堆積物Ｓと無関係の値なので正しい
が、水位信号Ａは堆積物Ｓの重み分の誤差分ＬX を含ん
だものとなる。つまり、水位信号ＡはＬA ＋ＬX となっ
ている。However, since the deposit S actually exists as shown in FIG. 4, the water level signal B obtained as L = L B + L O is correct because L O has a value unrelated to the deposit S, but the water level is correct. The signal A includes the error component L X corresponding to the weight of the deposit S. That is, the water level signal A is L A + L X.
【００１４】また、図４のように、流体Ｒが第２の圧力
式水位センサ２ａを超えている場合は、上記のようにし
て実水位Ｌの値を求められるが、もし、図５のように、
流体Ｒが第２の圧力式水位センサ２ａを下まわっている
と、この第２の圧力式水位センサ２ａでは水位の測定が
できず水位信号Ｂは不定となり、さらに、第１の圧力式
水位センサ２からの信号も、堆積物Ｓの誤差分ＬX が含
まれているために、信頼できない。Further, as shown in FIG. 4, when the fluid R exceeds the second pressure type water level sensor 2a, the value of the actual water level L can be obtained as described above. To
When the fluid R goes below the second pressure type water level sensor 2a, the water level cannot be measured by the second pressure type water level sensor 2a, and the water level signal B becomes indefinite, and further, the first pressure type water level sensor. The signal from 2 is also unreliable because it contains the error L X of the deposit S.
【００１５】よって、図４の状態の時に、本来なら水位
信号Ａ＝Ｂであるとの仮定に基づき、Ａ−Ｂの差が堆積
物Ｓの影響によるものであることを求めておく。そし
て、この影響による値ＬX を補正値（上記誤差分）とし
て、図５のように水位信号Ａしか得られなくなっても、
Ｌ＝ＬA ＝Ａ−ＬX を水位補正演算器４で算出すること
によって、堆積物Ｓの影響を受けずに、水位の測定、ひ
いては流体Ｒの流量を求めることができる。Therefore, in the state of FIG. 4, it is necessary to find that the difference between A and B is due to the influence of the deposit S, based on the assumption that the water level signal A = B is originally supposed. Then, even if only the water level signal A is obtained as shown in FIG. 5 by using the value L X due to this influence as the correction value (the above-mentioned error amount),
By calculating L = L A = A−L X by the water level correction calculator 4, the water level can be measured and the flow rate of the fluid R can be obtained without being affected by the deposit S.
【００１６】なお、堆積物Ｓの補正値ＬX の値は、流体
Ｒが図４の状態にある時に常時求めておき、図５の状態
になった時は、その直前の補正値ＬX の値を採用し、以
降これを返す。[0016] Incidentally, the correction value L X sediment S is to previously obtain always when the fluid R is in the state of FIG. 4, when the state of FIG. 5, immediately before the correction value L X Takes a value and returns it thereafter.
【００１７】実施例２．なお、上記実施例では絞り機構
１にパーマボーラスフリュームを用いているが、絞り機
構は図のように、パーシャルフリューム１ａなどに代え
てもよい。Example 2. Although a permabolus flume is used for the diaphragm mechanism 1 in the above embodiment, the diaphragm mechanism may be replaced with a partial flume 1a as shown in the drawing.
【００１８】また、水位補正演算器４はマイクロプロセ
ッサを有するものに限らず、補正値ＬX の値を求めて記
憶し、水位信号Ａより（加）減算ができる演算器であれ
ば何を用いてもよく、上記実施例と同様の効果を奏す
る。Further, the water level correction arithmetic unit 4 is not limited to one having a microprocessor, and any arithmetic unit capable of obtaining and storing the value of the correction value L X and performing (addition) subtraction from the water level signal A is used. However, the same effect as that of the above-described embodiment may be obtained.
【００１９】さらに、上記実施例では開水路に設置され
た絞り機構１によってその上流側に発生する水位から流
量を得るものを示したが、他のあらゆる水路，流路にお
ける水位，流量の測定に利用してもよく、上記実施例と
同様の効果を奏する。Further, in the above embodiment, the flow rate is obtained from the water level generated upstream of the throttling mechanism 1 installed in the open water channel. However, it is possible to measure the water level and flow rate in all other water channels and flow paths. It may be used, and the same effect as that of the above embodiment is obtained.
【００２０】[0020]
【発明の効果】以上のように、この発明によれば、水路
底に設置した第１の圧力式水位センサと、該第１の圧力
式水位センサの近傍であって、上記水路底の堆積物の重
みの影響を受けない設定水位に設けられた第２の圧力式
水位センサと、流体が上記第２の圧力式水位センサを超
えかつ水路底に堆積部がある場合は、該第２の圧力式水
位センサから水面までの距離および上記設定水位を加算
して実水位を求め、一方、上記流体が上記第２の圧力式
水位センサを下まわりかつ水路底に堆積物がある場合
は、予め上記実水位と上記第１の圧力式水位センサから
得た水位データとの誤差を補正値として、該補正値を上
記第１の圧力式水位センサから得た水位データから差引
いて水位を求める水位補正演算器とを備えて、水位／流
量演算器に、該水位補正演算器で求めた上記実水位また
は水位を流量変換させるように構成したので、土砂など
の堆積物を生じた場合でも、水位信号を測定し、補正す
ることが可能になり、特に、流量の少ない時にもその流
量を高精度に測定できるものが得られる効果がある。As described above, according to the present invention, the first pressure type water level sensor installed at the bottom of the water channel and the deposits in the vicinity of the first pressure type water level sensor and at the bottom of the water channel. Second pressure type water level sensor provided at a set water level not affected by the weight of the second pressure type, and if the fluid exceeds the second pressure type water level sensor and there is a deposit on the bottom of the water channel, the second pressure The actual water level is obtained by adding the distance from the water level sensor to the water surface and the set water level. On the other hand, when the fluid is below the second pressure type water level sensor and there is sediment at the bottom of the water channel, Using a difference between the actual water level and the water level data obtained from the first pressure type water level sensor as a correction value, the correction value is subtracted from the water level data obtained from the first pressure type water level sensor to obtain the water level And a water level / flow rate calculator, Since it is configured to convert the actual water level or the water level obtained by the positive operation unit into the flow rate, it is possible to measure and correct the water level signal even when sediment such as sediment is generated. Even if the flow rate is small, there is an effect that the flow rate can be measured with high accuracy.
【図１】この発明の一実施例による流量計を示す構成図
である。FIG. 1 is a configuration diagram showing a flow meter according to an embodiment of the present invention.
【図２】この発明の他の実施例を示す流量計の構成図で
ある。FIG. 2 is a configuration diagram of a flow meter showing another embodiment of the present invention.
【図３】この発明において堆積物がない場合の動作例を
示す説明図である。FIG. 3 is an explanatory view showing an operation example when there is no deposit in the present invention.
【図４】この発明において堆積物がある場合の動作例を
示す説明図である。FIG. 4 is an explanatory diagram showing an operation example when a deposit is present in the present invention.
【図５】この発明において堆積物がある場合の他の動作
例を示す説明図である。FIG. 5 is an explanatory diagram showing another operation example when deposits are present in the present invention.
【図６】従来の流量計を示す構成図である。FIG. 6 is a configuration diagram showing a conventional flowmeter.
２ 第１の圧力式水位センサ ２ａ 第２の圧力式水位センサ ３ 水位／流量演算器 ４ 水位補正演算器 Ｓ 堆積物 Ｒ 流体 2 1st pressure type water level sensor 2a 2nd pressure type water level sensor 3 Water level / flow rate calculator 4 Water level correction calculator S Sediment R Fluid
Claims (1)
サと、該第１の圧力式水位センサの近傍であって、上記
水路底の堆積物の重みの影響を受けない設定水位に設け
られた第２の圧力式水位センサと、流体が上記第２の圧
力式水位センサを超えかつ水路底に堆積部がある場合
は、該第２の圧力式水位センサから水面までの距離およ
び上記設定水位を加算して実水位を求め、一方、上記流
体が上記第２の圧力式水位センサを下まわりかつ水路底
に堆積物がある場合は、予め上記実水位と上記第１の圧
力式水位センサから得た水位データとの誤差を補正値と
して、該補正値を上記第１の圧力式水位センサから得た
水位データから差引いて水位を求める水位補正演算器
と、該水位補正演算器で求めた上記実水位または水位を
流量変換する水位／流量演算器とを備えた流量計。1. A first pressure type water level sensor installed at the bottom of a water channel, and a set water level in the vicinity of the first pressure type water level sensor which is not influenced by the weight of the sediment at the bottom of the water channel. The second pressure type water level sensor provided above, and if the fluid exceeds the second pressure type water level sensor and there is a deposit on the bottom of the water channel, the distance from the second pressure type water level sensor to the water surface and the above setting. The actual water level is obtained by adding the water levels. On the other hand, when the fluid is below the second pressure type water level sensor and there is a deposit on the bottom of the water channel, the actual water level and the first pressure type water level sensor are previously set. Using the error from the water level data obtained from the above as a correction value, the correction value is subtracted from the water level data obtained from the first pressure type water level sensor to obtain the water level, and the water level correction arithmetic unit Water level / flow rate for converting the actual water level or the water level A flow meter equipped with a calculator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4222232A JPH0650782A (en) | 1992-07-30 | 1992-07-30 | Flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4222232A JPH0650782A (en) | 1992-07-30 | 1992-07-30 | Flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0650782A true JPH0650782A (en) | 1994-02-25 |
Family
ID=16779189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4222232A Pending JPH0650782A (en) | 1992-07-30 | 1992-07-30 | Flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0650782A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008096303A (en) * | 2006-10-12 | 2008-04-24 | Yokogawa Electric Corp | Immersion type water gauge |
-
1992
- 1992-07-30 JP JP4222232A patent/JPH0650782A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008096303A (en) * | 2006-10-12 | 2008-04-24 | Yokogawa Electric Corp | Immersion type water gauge |
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