JPH0359366B2 - - Google Patents
Info
- Publication number
- JPH0359366B2 JPH0359366B2 JP57170833A JP17083382A JPH0359366B2 JP H0359366 B2 JPH0359366 B2 JP H0359366B2 JP 57170833 A JP57170833 A JP 57170833A JP 17083382 A JP17083382 A JP 17083382A JP H0359366 B2 JPH0359366 B2 JP H0359366B2
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- weir
- notches
- notch
- cover
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 3
- 101000927062 Haematobia irritans exigua Aquaporin Proteins 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/002—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow wherein the flow is in an open channel
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Description
〔発明の利用分野〕
本発明は水路に堰を設け、越流する水頭の大き
さを測定することにより流量測定を行う堰式流量
測定装置に関する。
〔従来技術〕
第１図に従来用いられている堰式流量測定装置
の代表的な構成を示す。
第１図において、水が矢印方向に流れる水路１
の途中に設けられた堰２の切欠き部２ａを越流す
る水位を水位計３で測定し演算器４で流量に対応
した信号に演算し、指示計５でその数値を読みと
るというものである。
かかる堰式流量装置の測定精度について考察し
てみると次のようになる。
通常、測定誤差は定格値（最大目盛）に対する
決められた割合で許容されている。例えば、許容
誤差が５％、測定範囲が０〜100m3／ｈの流量測
定装置について検討してみると下表のようにな
る。
[Field of Application of the Invention] The present invention relates to a weir-type flow rate measuring device that measures flow rate by providing a weir in a waterway and measuring the size of the overflowing water head. [Prior Art] Fig. 1 shows a typical configuration of a conventionally used weir type flow rate measuring device. In Figure 1, water channel 1 where water flows in the direction of the arrow
A water level gauge 3 measures the water level overflowing a notch 2a of a weir 2 provided in the middle of the flow, a calculator 4 calculates a signal corresponding to the flow rate, and an indicator 5 reads the value. . A consideration of the measurement accuracy of such a weir-type flow rate device is as follows. Normally, measurement errors are allowed at a predetermined percentage of the rated value (maximum scale). For example, if we consider a flow rate measuring device with an allowable error of 5% and a measurement range of 0 to 100 m 3 /h, the results will be as shown in the table below.
本発明の目的は前述した従来技術の欠点をなく
し、小流量時から大流量時にわたつて経済的に、
しかも精度良く測定できる堰式流量測定装置を提
供するにある。
〔発明の概要〕
本発明の特徴とするところは堰の上側に複数個
の切欠き部を設けると共に、これら切欠き部にそ
れぞれ水の通流を阻止するカバーを取外し自在に
取付け、流量増加に従いカバーを取外し水の通流
する切欠き部の数を増加させるようにしたことに
ある。
〔発明の実施例〕
第２図に本発明の一実施例を示す。
第２図において第１図と異なるところは堰２に
複数個の切欠き部２ａを設け、各切欠き部２ａに
それぞれ水の越流を阻止するカバー６を設けたこ
とである。第２図は３個の切欠き部２ａを設け、
２個の切欠き部２ａにカバー６を取付けた状態を
示している。なお、切欠き部２ａの面積は第１図
に比べ小さくなつている。
この構成において水位計３で測定された水位Ｈ
が演算器４に入力される。演算器４は次式に従い
流量Ｑ（m3／min）を求める。
Ｑ＝Kbh3/2 ……(1)
ｂ：切欠き部２ａの幅（ｍ）
ｈ：越流水頭（ｍ）
Ｋ：流量係数
なお、越流水頭ｈは水路１の底面から切欠き部
２ａの下端までの距離をｌとするとＨ−ｌで求め
られる。
このようにして演算器４で求められた流量Ｑが
流量指示計５に指示される。
さて、測定流量が増加したならば１個の切欠き
部２のカバー６を取外して２個の切欠き部２ａか
ら越流するようにする。越流する切欠き部２ａを
２個にしても演算器４は越流水頭ｈから流量Ｑを
求めているので１個の切欠き部２ａから越流して
いるときと同じ演算測定流量を求めている。した
がつて、この場合には指示計５の指示値を２倍に
すれば実際の流量を測定できる。ただし、越流す
る切欠き部２ａが１個のときにおける指示計５の
目盛を２倍にすれば指示計の指示値が実際の流量
となる。
以上のようにして流量測定するのであるが、測
定流量が増えるに従つて１個ずつ、あるいは複数
個ずつカバー６を取外して行くと、切欠き部２ａ
が１個の場合に比べ切欠き数をｎとするとｎ倍ま
で測定できる。また、切欠き部２ａの１個当りの
測定範囲は小さいので小水量時にも精度よく測定
することができる。
第３図は本発明の他の実施例を示し、切欠き部
を三角にしたものである。
第３図において第２図と異なるのは堰２に三角
の切欠き部２ｂを設けたことである。なお、この
場合、流量Ｑは次式で求められる。
Ｑ＝Kh5/2 ……(2)
第３図の実施例においても第２図と同様にして
流量測定できるのは明らかであろう。
〔発明の効果〕
以上説明したように本発明は小流量時にも精度
良く測定することができ、また、測定範囲を変更
するためのカバーは単に流れをせきとめるもので
あればよく、安価にできる。また、測定範囲の変
更はカバーを取外すだけでよく、極めて簡単に短
時間で行える。
なお、上述の実施例は四角あるいは三角の切欠
き部を３個設けているが、種々の条件によつて、
異なつた形状、個数にすることもできるのは勿論
である。
The purpose of the present invention is to eliminate the drawbacks of the prior art described above, and to provide an economical solution for both small and large flow rates.
Moreover, it is an object of the present invention to provide a weir type flow rate measuring device that can measure with high accuracy. [Summary of the Invention] The present invention is characterized by providing a plurality of notches on the upper side of the weir, and removably attaching a cover to each of these notches to prevent the flow of water. The reason is that the cover is removed to increase the number of notches through which water flows. [Embodiment of the Invention] FIG. 2 shows an embodiment of the present invention. The difference between FIG. 2 and FIG. 1 is that the weir 2 is provided with a plurality of notches 2a, and each of the notches 2a is provided with a cover 6 for preventing water from overflowing. In FIG. 2, three notches 2a are provided,
A state in which the cover 6 is attached to the two notches 2a is shown. Note that the area of the notch 2a is smaller than that in FIG. In this configuration, the water level H measured by the water level gauge 3
is input to the calculator 4. The calculator 4 calculates the flow rate Q (m 3 /min) according to the following equation. Q=Kbh 3/2 ...(1) b: Width of notch 2a (m) h: Overflow head (m) K: Flow coefficient Note that overflow head h is from the bottom of waterway 1 to notch 2a Letting l be the distance to the lower end of , it is calculated as H-l. The flow rate Q determined by the calculator 4 in this manner is indicated to the flow rate indicator 5. Now, when the measured flow rate increases, the cover 6 of one notch 2 is removed and the flow is allowed to overflow from the two notches 2a. Even if there are two overflowing notches 2a, the calculator 4 calculates the flow rate Q from the overflow head h, so the same calculated and measured flow rate as when overflowing from one notch 2a is calculated. There is. Therefore, in this case, the actual flow rate can be measured by doubling the indicated value of the indicator 5. However, if the scale of the indicator 5 when there is one overflowing notch 2a is doubled, the indicated value of the indicator becomes the actual flow rate. The flow rate is measured as described above, and as the measured flow rate increases, the covers 6 are removed one by one or several at a time.
When the number of notches is n, it is possible to measure up to n times compared to the case where there is one notch. Furthermore, since the measurement range of each notch 2a is small, accurate measurement can be performed even when the amount of water is small. FIG. 3 shows another embodiment of the present invention, in which the notch is triangular. What differs from FIG. 2 in FIG. 3 is that a triangular notch 2b is provided in the weir 2. Note that in this case, the flow rate Q is determined by the following equation. Q=Kh 5/2 (2) It is clear that the flow rate can be measured in the embodiment shown in FIG. 3 in the same manner as in FIG. 2. [Effects of the Invention] As explained above, the present invention can measure accurately even when the flow rate is small, and the cover for changing the measurement range can be used as long as it simply blocks the flow, making it inexpensive. . Additionally, changing the measurement range can be done simply by removing the cover, which can be done extremely easily and in a short time. In addition, although the above-mentioned embodiment has three square or triangular notches, depending on various conditions,
Of course, different shapes and numbers can be used.
第１図は従来の堰式流量測定装置の一例を示す
構成図、第２図は本発明の一実施例を示す構成
図、第３図は本発明の他の実施例を示す要部構成
図である。
１……水路、２……堰、２ａ，２ｂ……切欠き
部、３……水位計、４……演算器、５……流量指
示計、６……カバー。
Fig. 1 is a block diagram showing an example of a conventional weir-type flow rate measuring device, Fig. 2 is a block diagram showing an embodiment of the present invention, and Fig. 3 is a block diagram showing main parts of another embodiment of the present invention. It is. 1... Channel, 2... Weir, 2a, 2b... Notch, 3... Water level gauge, 4... Arithmetic unit, 5... Flow rate indicator, 6... Cover.
Claims (1)
定装置において、堰の上側に複数個の切欠き部を
設けると共にこれら切欠き部にそれぞれ水の通流
を阻止するカバーを取外し自在に取付け、前記水
路の流量増加に従い前記カバーを取外し水の通流
する切欠き部を増加させるようにしたことを特徴
とする堰式流量測定装置。1. In a weir-type flow rate measurement device that measures the flow rate by installing a weir in a waterway, multiple notches are provided above the weir, and a cover that blocks water flow is removably attached to each of these notches. A weir-type flow rate measuring device, characterized in that as the flow rate of the waterway increases, the cover is removed to increase the number of notches through which water flows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57170833A JPS5961716A (en) | 1982-10-01 | 1982-10-01 | Weir type flow rate measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57170833A JPS5961716A (en) | 1982-10-01 | 1982-10-01 | Weir type flow rate measuring apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5961716A JPS5961716A (en) | 1984-04-09 |
| JPH0359366B2 true JPH0359366B2 (en) | 1991-09-10 |
Family
ID=15912173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57170833A Granted JPS5961716A (en) | 1982-10-01 | 1982-10-01 | Weir type flow rate measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5961716A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0619052Y2 (en) * | 1987-06-15 | 1994-05-18 | 株式会社テイエルブイ | Liquid flow meter |
| IT201900014127A1 (en) * | 2019-08-06 | 2021-02-06 | Carlo Marelli | EQUIPMENT FOR CONTINUOUS REMOTE MEASUREMENT OF THE FLOW OF WATER ON BODY MOUNTING PORTS FOR IRRIGATION |
| JP2022158221A (en) * | 2021-04-01 | 2022-10-17 | ジャパンマリンユナイテッド株式会社 | Lubricant flow sensor and vessel having the same |
-
1982
- 1982-10-01 JP JP57170833A patent/JPS5961716A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5961716A (en) | 1984-04-09 |
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