JPH0537213Y2 - - Google Patents
Info
- Publication number
- JPH0537213Y2 JPH0537213Y2 JP11337986U JP11337986U JPH0537213Y2 JP H0537213 Y2 JPH0537213 Y2 JP H0537213Y2 JP 11337986 U JP11337986 U JP 11337986U JP 11337986 U JP11337986 U JP 11337986U JP H0537213 Y2 JPH0537213 Y2 JP H0537213Y2
- Authority
- JP
- Japan
- Prior art keywords
- flow
- rectifier
- fluid
- measurement system
- rate measurement
- 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 - Lifetime
Links
- 239000012530 fluid Substances 0.000 claims description 40
- 238000005259 measurement Methods 0.000 claims description 36
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 241000251468 Actinopterygii Species 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 239000013049 sediment Substances 0.000 description 8
- 230000002093 peripheral effect Effects 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000004907 flux Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Details Of Flowmeters (AREA)
- Measuring Volume Flow (AREA)
Description
【考案の詳細な説明】
〔考案の目的〕
（産業上の利用分野）
本考案は、流量計の上流側に十分な直管部がと
れない場合に高精度な流量測定を可能ならしめる
流量計測システムに関する。[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention is a flow meter that enables highly accurate flow measurement when there is not enough straight pipe on the upstream side of the flow meter. Regarding the system.
（従来の技術）
従来からの流量計測システムは、第１９図ａ，
ｂに示すように、曲管３などの流れ乱し要素と流
量計１との間に十分な直管部がとれない場合は、
第１９図ｂに示すように管内全体に均質な整流体
２ａを配置した整流管２を流量計１の上流側に組
込み、曲管３の出口部における流速分布が一様で
ない非軸対称流４を符号５で示すフローパタンが
得られるように整流し、その整流された流れを流
量計１で計測し、高精度化測定を行なつていた。(Prior art) The conventional flow rate measurement system is as shown in Fig. 19a,
As shown in b, if there is not enough straight pipe between the flow disturbance element such as the curved pipe 3 and the flowmeter 1,
As shown in FIG. 19b, a rectifying pipe 2 in which a homogeneous rectifying fluid 2a is arranged throughout the pipe is installed on the upstream side of the flowmeter 1, and a non-axisymmetric flow 4 in which the flow velocity distribution is not uniform at the outlet of the curved pipe 3 is installed. The rectified flow was rectified so as to obtain a flow pattern indicated by reference numeral 5, and the rectified flow was measured with a flowmeter 1 to perform highly accurate measurement.
しかしながら、電磁流量計が得意とするスラリ
ー流体、ビニール袋や布等の有形物が混入する可
能性のある流体、土砂あるいは魚等が流入して来
る流体などの測定に対しては、従来からの整流管
を組込むこともできず、高精度化測定が不可能で
あつた。さらに、混入物の無い流体の場合でも、
従来からの整流管は、圧力損失が大きく、使用に
当つての制約条件も多いなどの欠点があつた。 However, conventional methods cannot be used to measure slurry fluids, which electromagnetic flowmeters are good at, fluids that may be contaminated with tangible objects such as plastic bags or cloth, and fluids in which sediment, fish, etc. flow in. It was also impossible to incorporate a rectifier tube, making highly accurate measurements impossible. Furthermore, even in the case of fluids without contaminants,
Conventional rectifier tubes have had drawbacks such as large pressure loss and many restrictions on use.
（考案が解決しようとする問題点）
上記のように従来からの整流管は、スラリー流
体、ビニール袋や布等の有形物が混入する可能性
のある流体、土砂や魚等が流入して来る流体等に
対しては使用できず、このような流体に対する電
磁流量計を用いた流量計測において、設置場所の
制約から十分な直管部をとれない場合、流量測定
精度の高度化ができないという問題があつた。そ
こで本考案は、上記の問題点を解決できる流量計
測システムを提供することを目的とする。(Problems to be solved by the invention) As mentioned above, conventional rectifier pipes allow slurry fluid, fluids that may be mixed with tangible objects such as plastic bags and cloth, sediment, fish, etc. to flow in. It cannot be used for fluids, etc., and when measuring flow rates using electromagnetic flowmeters for such fluids, there is a problem that if a sufficient straight pipe section cannot be provided due to restrictions on the installation location, it is not possible to improve the flow rate measurement accuracy. It was hot. Therefore, an object of the present invention is to provide a flow rate measurement system that can solve the above problems.
（問題点を解決するための手段）
本考案の流量計測システムは、流速分布が一様
でなくても軸対称流であれば正確な測定ができる
電磁流量計検出器と、この電磁流量計検出器の上
流側に接続され非軸対称流を流速分布が一様でな
い軸対称流に変える整流装置とで構成される。
(Means for solving the problem) The flow measurement system of the present invention consists of an electromagnetic flowmeter detector that can accurately measure axially symmetrical flow even if the flow velocity distribution is not uniform, and this electromagnetic flowmeter detector. It consists of a rectifier connected to the upstream side of the vessel and converting a non-axisymmetric flow into an axisymmetric flow with an uneven flow velocity distribution.
（作用）
本考案の流量計測システムにおいては、整流装
置は、流速分布を一様にする必要がないことか
ら、主に流路の外周壁に近い層の部分を整流すれ
ばよいことになり、整流装置は、整流体を外周壁
の内側の壁に近い層に配置した構造とすることが
できる。したがつて、整流装置は流路の中央部分
が自由に通過できる領域となつており、その断面
積もかなり大きいので、スライー流体、有形物が
混入する可能性のある流体、土砂や魚等が流入し
て来る流体等に対しても使用可能となると共に、
圧力損失も小さい。この結果、本考案の流量計測
システムによれば、スラリー流体、有形物が混入
する可能性のある流体、土砂や魚等が流入して来
る流体等に対する電磁流量計検出器を用いた流量
計測において、設置場所の制約から十分な直管部
をとれない場合にも、流量測定精度の高度化要求
に対処することができる。(Function) In the flow measurement system of the present invention, since the rectifier does not need to make the flow velocity distribution uniform, it is sufficient to mainly rectify the layer near the outer peripheral wall of the flow path. The flow regulating device may have a structure in which the flow regulating device is arranged in a layer close to the inner wall of the outer peripheral wall. Therefore, the center of the flow path of the rectifier is an area through which it can pass freely, and its cross-sectional area is quite large, so sly fluid, fluid that may contain tangible objects, sediment, fish, etc. It can also be used for incoming fluids, etc., and
Pressure loss is also small. As a result, according to the flow rate measurement system of the present invention, flow rate measurement using an electromagnetic flowmeter detector for slurry fluid, fluid that may contain tangible objects, fluid in which sediment, fish, etc. are flowing, is possible. Even when a sufficient straight pipe section cannot be provided due to restrictions on the installation location, it is possible to meet the demand for higher flow rate measurement accuracy.
（実施例）
以下、図面に示した実施例に基づいて本考案を
詳細に説明する。第１図ａ，ｂに本考案一実施例
の流量計測システムを示す。第１図ａに示すよう
に、管路の流量計測点に設置された電磁流量計検
出器１１の上流側にある流れ乱し要素１３と電磁
流量計検出器１１の間に整流装置１２が介在され
ている。整流装置１２は、第１図ｂに示すよう
に、整流装置の外周管壁１２ａの内側の壁に近い
層に管状の整流体１２ｂが外周管壁１２ａと同心
に４個の固定腕１２ｃによつて固定された構造で
ある。固定腕１２ｃは、整流体１２ｂの軸方向に
適宜の長さ延在する板状をしている。上記の流れ
乱し要素１３としては、曲り管、弁、弁とＴ形分
岐管、ポンプなどがある。(Example) Hereinafter, the present invention will be explained in detail based on the example shown in the drawings. Figures 1a and 1b show a flow rate measuring system according to an embodiment of the present invention. As shown in FIG. 1a, a rectifier 12 is interposed between the electromagnetic flowmeter detector 11 and a flow turbulence element 13 located upstream of the electromagnetic flowmeter detector 11 installed at the flow rate measurement point of the pipeline. has been done. As shown in FIG. 1b, the rectifier 12 has a tubular rectifier 12b arranged in a layer close to the inner wall of the outer circumferential tube wall 12a of the rectifier by four fixed arms 12c concentrically with the outer circumferential tube wall 12a. It is a fixed structure. The fixed arm 12c has a plate shape extending an appropriate length in the axial direction of the fluid regulator 12b. The above-mentioned flow disturbance elements 13 include bent pipes, valves, valves and T-shaped branch pipes, pumps, etc.
このように構成された本考案一実施例の流量計
測システムにおいては、流れ乱し要素１３の出口
側における流速分布が一様でない非軸対称流（第
１９図ａにおいて符号４で示すようなもの）が、
整流装置１２の整流体１２ｂおよび固定腕１２ｃ
の整流作用により、整流装置１２の出口側では第
２図に符号１４で示すような中心部が突出してい
る軸対称流に変る。電磁流量計検出器１１は、軸
対称流であれば流速分布が一様でなくても高精度
測定ができるように作られているので、符号１４
で示すフローパターンで流れる流体を高精度で流
量測定することができる。また、整流装置１２
は、整流体１２ｂの管内部が自由に通過できる流
路となつており、その断面積もかなり大きいの
で、スラリー流体、有形物が混入する可能性のあ
る流体、土砂や魚等が流入して来る流体等に対し
ても整流作用を維持できる。 In the flow rate measurement system of the embodiment of the present invention configured as described above, a non-axisymmetric flow (such as the one indicated by reference numeral 4 in FIG. )but,
Rectifier 12b and fixed arm 12c of rectifier 12
Due to the rectifying action, the flow changes to an axially symmetrical flow with a protruding central portion on the outlet side of the rectifying device 12, as shown by reference numeral 14 in FIG. The electromagnetic flowmeter detector 11 is designed to be able to perform highly accurate measurement of axially symmetrical flow even if the flow velocity distribution is not uniform.
It is possible to measure the flow rate of a fluid flowing with the flow pattern shown with high accuracy. In addition, the rectifier 12
is a flow path through which the inside of the pipe of the fluid regulator 12b can freely pass, and its cross-sectional area is quite large, so slurry fluid, fluid that may contain tangible objects, sediment, fish, etc., cannot flow in. The rectifying effect can be maintained even for incoming fluids.
次に、軸対称流であれば正確に測定できる電磁
流量計検出器１１の必要条件につき述べる。流体
軸方向の磁場の長さが比較的短い電磁流量計検出
器の起電力と流速の関係は、次の式で表わされ
る。（第３図参照）
Ｅ＝Ｄ／π∫1 0 ∫z〓0
（WyBx＋WxBy）Vz・Ｒ・dθdR ……(1)
Ｅ：電極１０２，１０３間に発生する信号起電
力
Ｄ： 測定管１０１の内径，Ｄ＝2a（ａは測定
管の内半径）
Ｒ＝ｒ／ａ，θは極座標変換を行なうために用い
た角度
Bx，By：磁束密度のＸ方向，ｙ方向成分
Wx，Wy：第３図のＰ点にｘ方向またはｙ方向
に起電力が発生した場合に、それが電極１０
２，１０３間にどの程度となつて現われるか
を示す係数
Vz：測定管１０１内の（紙面に直角な方向の）
流速
Wxは電磁気学から求められたもので(2)式で表
わすことができる、
Wx＝R2sin2θ／１−2R2cos2θ＋R4 ……(2)
Wyは、第４図に示すように、単位の起電力が
測定管１０１の中の任意の点に発生したとき、電
極１０２，１０３に寄与する重み関数であり(3)式
で表わすことができる、
Wy＝１−R2cos2θ／１−2R2cos2θ＋R4 ……(3)
By，Byは、点Ｐ（ｒ，θ）におけるｘ方向およ
びｙ方向の磁束密度である。 Next, the requirements for the electromagnetic flowmeter detector 11 that can accurately measure an axially symmetrical flow will be described. The relationship between the electromotive force and flow velocity of an electromagnetic flowmeter detector whose magnetic field length in the fluid axis direction is relatively short is expressed by the following equation. (See Figure 3) E=D/π∫ 1 0 ∫ z 〓 0 (W y B x + W x B y ) V z・R・dθdR ...(1) E: Signal generated between electrodes 102 and 103 Electromotive force D: Inner diameter of the measuring tube 101, D=2a (a is the inner radius of the measuring tube) R=r/a, θ is the angle used for polar coordinate conversion B x , By : X direction of magnetic flux density , y-direction components W x , W y : When an electromotive force is generated in the x-direction or y-direction at point P in FIG.
Coefficient V z that indicates the degree to which it appears between 2 and 103: Inside the measuring tube 101 (in the direction perpendicular to the plane of the paper)
The flow velocity W x was determined from electromagnetism and can be expressed by equation (2), W x = R 2 sin2θ/1-2R 2 cos2θ + R 4 ...(2) W y is as shown in Figure 4. When a unit of electromotive force is generated at an arbitrary point in the measuring tube 101, it is a weighting function that contributes to the electrodes 102 and 103, and can be expressed by equation (3), W y = 1−R 2 cos2θ /1-2R 2 cos2θ+R 4 (3) B y and By are the magnetic flux densities in the x direction and y direction at the point P (r, θ).
ここで、「流れが軸対称流である」という必要
条件を入れて計算する。すなわち、軸対称流の時
の起電力Ｅは、を平均流速とすると、
Ｅ＝B0Ｄ｛2∫1 0Ｋ（Ｒ）
・ｆ（Ｒ）・dR｝ ……(4)
となる、ただし、
B0＝２／π∫1 0（１−R2）R∫2〓0
（WyBx＋WxBy）dθ・dR ……(5)
であり、
Ｋ（Ｒ）＝１／2π∫2〓0（Wygx
＋Wxgy）dθ ……(6)
である。 Here, calculations are performed with the necessary condition that "the flow is an axially symmetrical flow". In other words, the electromotive force E in an axially symmetrical flow is as follows: E=B 0 D{2∫ 1 0 K(R) ・f(R)・dR} ...(4), where is the average flow velocity , B 0 = 2/π∫ 1 0 (1−R 2 )R∫ 2 〓 0 (W y B x + W x B y ) dθ・dR ...(5), and K(R) = 1/2π ∫ 2 〓 0 (W y g x + W x g y ) dθ ……(6).
ここで、gx＝Bx／B0，gy＝By／B0 であり、 ｆ（Ｒ）＝z（Ｒ）／z ……(7) である。 Here, g x =B x /B 0 , g y =B y /B 0 , and f(R) = z (R)/ z (7).
以上からわかるように、B0は流れが定常流と
考える時の実効的な磁束密度であり、流れが定常
流の時は、
Ｅ＝B0Ｄ ……(8)
となる。 As can be seen from the above, B 0 is the effective magnetic flux density when the flow is considered to be a steady flow, and when the flow is a steady flow, E=B 0 D (8).
したがつて、下記の(9)式が、定常層流の時に対
する電磁流量計の比感度（Ｓ）を表わすことにな
る。 Therefore, the following equation (9) represents the specific sensitivity (S) of the electromagnetic flowmeter with respect to steady laminar flow.
Ｓ＝2∫1 0Ｋ（Ｒ）・ｆ（Ｒ）・dR ……(9)
Ｋ（Ｒ）がＲに関せず一定であれば、(9)式は１
に等しくなり、どのような流速分布ｆ（Ｒ）を持
つ流れでも正確に測定できる。S=2∫ 1 0 K(R)・f(R)・dR ……(9) If K(R) is constant regardless of R, equation (9) becomes 1
Therefore, any flow having any flow velocity distribution f(R) can be accurately measured.
Ｋ（Ｒ）がＲの関数であれば、ｆ（Ｒ）の形にな
つて誤差が発生する。 If K(R) is a function of R, an error will occur in the form f(R).
Ｋ（Ｒ）が一定であるためには、gx＝１，gy＝
一定なる条件が必要で、この条件は磁束密度で均
一であることを表わしている。 In order for K(R) to be constant, g x = 1, g y =
A constant condition is required, and this condition indicates that the magnetic flux density is uniform.
しかし、磁束密度が均一でなくてもコイルの形
状、測定管との立体配置等を考え、軸対称流であ
れば実用上問題とならない条件を下記の(10)式に示
す。 However, even if the magnetic flux density is not uniform, considering the shape of the coil, the three-dimensional arrangement with the measuring tube, etc., the following equation (10) shows the condition that there is no problem in practice as long as the flow is axially symmetrical.
εk＝√2∫1 0｛１−（）2｝・ ……(10) ここにεkは誤差を表わす。ε k =√2∫ 1 0 {1−() 2 }・ ...(10) Here ε k represents the error.
評価関数から評価しながら電磁流量計を設計す
れば、本考案の流量計測システムに適した電磁流
量計検出器１１を作ることができる。 If an electromagnetic flowmeter is designed while being evaluated based on the evaluation function, an electromagnetic flowmeter detector 11 suitable for the flow rate measurement system of the present invention can be manufactured.
本考案の流量計測システムに適するように作ら
れた電磁流量計検出器１１によつて高精度流量測
定が可能な軸対称流のフローパターンとしては、
第２図に符号１４で示したフローパターンの他
に、第５図に示すような全体的ブロードな尖頭を
持つてた軸対称流、第６図に示すような中間部が
速く、管壁近傍と中央部が遅い軸対称流、第７図
に示すような管壁近傍よりも中央部が遅い軸対称
流等がある。 The flow pattern of an axially symmetrical flow that allows highly accurate flow measurement with the electromagnetic flow meter detector 11 made suitable for the flow measurement system of the present invention is as follows.
In addition to the flow pattern shown with reference numeral 14 in Fig. 2, there is also an axisymmetric flow with an overall broad peak as shown in Fig. 5, a flow pattern that is fast in the middle part, and There are axially symmetrical flows that are slower in the vicinity and center, and axially symmetrical flows that are slower in the center than near the pipe wall, as shown in FIG.
また、本考案の流量計測システムで用いる整流
装置は、第１図ａ，ｂの実施例で例示した整流装
置１２の他に、第８図乃至第１３図に示す変形例
が可能である。第８図に示す整流装置２２は、そ
の外周管壁２２ａの内側に接触させて細管２２ｃ
を配列し、各細管２２ｃ間を連結腕２２ｄで連結
して成る整流体２２ｂを設けた構造である。ま
た、第９図に示す整流装置３２は、その外周管壁
３２ａの内側の壁に近い層い環状の網から成る整
流体３２ｂを配置し、整流体３２ｂの内周枠３２
ｃと十字状格子３２ｄで整流体３２ｂを外周管壁
３２ａに固定した構造である。さらに、第１０図
に示す整流装置４２は、その外周管壁４２ａの内
側の壁に近い層に、環状の厚板に多数の丸穴４２
ｃを明けた整流体４２ｂを配置し、整流体４２ｂ
の外周縁を外周管壁４２ａに溶接固定した構造で
ある。また、第１１図に示す整流装置５２は、そ
の外周管壁５２ａに内接する正方形状の固定枠５
２ｃの外側の管壁との間のスペースにそれぞれ網
５２ｄを張つた整流体５２ｂを有する構造であ
る。また、第１２図に示す整流装置６２は、その
外周管壁６２ａの内面に管軸方向に延在する複数
例えば４個のフインから成る整流体６２ｂを設け
た構造である。上記の各整流装置はいずれも流路
の中央部分のかなり面積が自由に通過できる流路
となつているため、スラリー流体、有形物が混入
する可能性のある流体、土砂や魚等が流入して来
る流体等に対しても整流作用を維持できる。 In addition to the rectifier 12 illustrated in the embodiments of FIGS. 1a and 1b, the rectifier used in the flow rate measurement system of the present invention may be modified as shown in FIGS. 8 to 13. The rectifying device 22 shown in FIG.
It has a structure in which a fluid regulator 22b is provided by arranging the thin tubes 22c and connecting each thin tube 22c with a connecting arm 22d. Further, the flow straightening device 32 shown in FIG. 9 has a flow regulating device 32b made of a layered annular net close to the inner wall of the outer peripheral pipe wall 32a, and the inner peripheral frame 32 of the fluid regulating device 32b
It has a structure in which the flow regulator 32b is fixed to the outer circumferential tube wall 32a by a cross-shaped grid 32d. Furthermore, the rectifying device 42 shown in FIG.
Arrange the rectifier 42b with the gap c, and
It has a structure in which the outer peripheral edge of the tube is welded and fixed to the outer peripheral tube wall 42a. Further, the rectifying device 52 shown in FIG.
It has a structure in which a flow regulator 52b is provided with a mesh 52d stretched in the space between the tube wall 2c and the outer pipe wall. Further, the flow straightening device 62 shown in FIG. 12 has a structure in which a flow regulating device 62b consisting of a plurality of fins, for example, four, extending in the tube axis direction is provided on the inner surface of the outer circumferential tube wall 62a. In each of the above-mentioned flow rectifiers, a considerable area in the center of the flow path is a flow path that can freely pass through, so slurry fluid, fluid that may contain tangible objects, sediment, fish, etc. cannot flow in. It is possible to maintain a rectifying effect even for fluids that come in contact with the flow.
さらに、第１３図に示す整流装置７２は、第６
図および第７図に示したフローパターンの軸対称
流を得るためのもので、整流装置７２の管の中央
部分に、外周縁を枠７２ｄで保持された円形の網
７２ｃから成る整流体７２ｂを配置し、この整流
体７２ｂを３本の固定腕７２ｅで外周管壁７２ａ
に固定した構造である。 Furthermore, the rectifying device 72 shown in FIG.
This is to obtain the axisymmetric flow of the flow pattern shown in FIG. 7 and FIG. This rectifying fluid 72b is connected to the outer circumferential tube wall 72a with three fixed arms 72e.
It is a fixed structure.
また、整流装置内の整流体の長さｌと整流装置
の長さＬとの関係も下記のように種々変形して実
施できる。すなわち、第１４図に示す例は、整流
体９０Ａが整流装置８０Ａのほぼ全長にわたつて
（lL）入つている場合である。第１５図に示す例
は、整流体９０Ｂが整流装置８０Ｂの上流側にか
たよつて入つている場合である。第１６図に示す
例は、整流体９０Ｃが整流装置８０Ｃの下流側に
かたよつている場合である。第１７図に示す例
は、上流側に設置された全長の短い整流装置８０
Ｄに整流体９０Ｄがほぼ全長にわたつて入つてお
り、この整流装置８０Ｄの下流側に短管１００が
接続されている場合である。第１８図に示す例
は、短い整流体９０Ｅ，９０Ｆ，９０Ｇが整流装
置８０Ｅの軸方向に互いに離隔して配置された場
合である。 Further, the relationship between the length l of the rectifier in the rectifier and the length L of the rectifier can be modified in various ways as described below. That is, the example shown in FIG. 14 is a case where the rectifying fluid 90A is inserted over almost the entire length (lL) of the rectifying device 80A. The example shown in FIG. 15 is a case where the rectifier 90B is biased toward the upstream side of the rectifier 80B. The example shown in FIG. 16 is a case where the rectifier 90C is shifted to the downstream side of the rectifier 80C. The example shown in FIG. 17 is a rectifier 80 with a short overall length installed on the upstream side.
This is a case where a rectifying fluid 90D is contained in D over almost the entire length, and a short pipe 100 is connected to the downstream side of this rectifying device 80D. The example shown in FIG. 18 is a case where short rectifiers 90E, 90F, and 90G are arranged apart from each other in the axial direction of the rectifier 80E.
以上詳述したように本考案の流量計測システム
は、流速分布が一様でない軸対称流に対し高精度
流量測定が可能な電磁流量計検出器の上流側に、
非軸対称流を流速分布が一様でない軸対称流に変
える整流装置を接続して構成される。流速分布が
様でなくてもよいことから、整流装置は主に流路
の外周壁に近い層に部分を整流すればよいことに
なり、整流体を外周管の内側の壁に近い層に配置
した構造とすることができる。したがつて、整流
装置は流路の中央部分のかなりの面積が自由に通
過できる領域となるため、スラリー流体、有形物
が混入する可能性のある流体、土砂や魚等が流入
して来る流体等に対しても使用可能となると共に
圧力損失も小さい。この結果、本考案の流量計測
システムによれば、スラリー流体、有形物が混入
する可能性のある流体、土砂や魚等が流入して来
る流体等に対する電磁流量計検出器を用いた流量
計測において、設置場所の制約から十分な直管部
をとれない場合にも、流量測定精度の高度化要求
に対処可能となる。さらに、混入物の無い水の電
磁流量計検出器を用いた流量計測においても、既
設のプラントは測定精度も高く要求されなかつた
時代を反映して直管部の短かいものがかなりあ
る。このような既設プラントにおいて流量コント
ロール精度を上げる必要から流量測定精度高度化
の要求が出た際にも、本考案の流量計測システム
を用いれば、既設の交流励磁方式の電磁流量計検
出器のスペースに本考案の整流装置と検出器を組
合わせたものが納まる上、本考案の整流装置の圧
力損失が小さいために既設の送水ポンプで能力不
足の問題を起すことが無く、要求に応えることが
できる。
As detailed above, the flow measurement system of the present invention has an electromagnetic flowmeter detector upstream of the electromagnetic flowmeter detector, which is capable of highly accurate flow measurement for axisymmetric flows with uneven flow velocity distribution.
It is constructed by connecting a rectifier that changes a non-axisymmetric flow into an axisymmetric flow with an uneven flow velocity distribution. Since the flow velocity distribution does not have to be uniform, the flow straightening device only needs to straighten the part of the flow path that is close to the outer wall of the flow path, and the flow straightener is placed in the layer that is close to the inner wall of the outer tube. It is possible to have a structure with Therefore, the rectifier has a large area in the center of the channel that can freely pass through, so slurry fluid, fluid that may contain tangible objects, and fluid that inflows with sediment, fish, etc. It can also be used for other applications, and the pressure loss is also small. As a result, according to the flow rate measurement system of the present invention, flow rate measurement using an electromagnetic flow meter detector for slurry fluid, fluid that may contain tangible objects, fluid in which sediment, fish, etc. are flowing, is possible. Even in cases where sufficient straight pipe sections cannot be provided due to constraints on the installation location, it is possible to meet the demand for higher flow rate measurement accuracy. Furthermore, even when measuring flow rates using electromagnetic flowmeter detectors for water without contaminants, existing plants often have short straight pipes, reflecting the era when high measurement accuracy was not required. Even when there is a demand for higher flow measurement accuracy due to the need to improve flow control accuracy in existing plants, the flow measurement system of this invention can be used to save space for existing AC excitation type electromagnetic flowmeter detectors. The combination of the rectifier and detector of the present invention can be installed in the space, and since the pressure loss of the rectifier of the present invention is small, there is no problem of insufficient capacity with the existing water pump, and it is possible to meet the demand. can.
第１図ａ，ｂは本考案一実施例の流量計測シス
テムを示し、第１図ａは構成を示す概略図、第１
図ｂは第１図ａにおける整流装置の断面図、第２
図は第１図ａに示す整流装置の出口側におけるフ
ローパターンを示す図、第３図は電磁流量計検出
器の起電力と流速との関係を説明するための図、
第４図は電磁流量計検出器における起電力の重み
関数の説明図、第５図乃至第７図はそれぞれ本考
案の流量計測システムにおいて正確な測定を行な
うために許される軸対称流の異なるフローパター
ンを示す図、第８図乃至第１３図はそれぞれ本考
案の流量計測システムにおける整流装置の異なる
変形例を示す概略図、第１４図乃至第１８図はそ
れぞれ本考案の流量計測システムにおける整流装
置の整流体の異なる変形例を示す概略図、第１９
図ａ，ｂは整流管を用いた流量計測システムの従
来例を示し、第１９図ａは構成を示す概略図、第
１９図ｂは第１９図ａにおける整流管の断面図で
ある。
１……電磁流量計検出器、１２……整流装置、
１２ａ……外周管壁、１２ｂ……整流体、１２ｃ
……固定腕、１３……流れ乱し要素、２２……整
流装置、２２ｂ……整流体、３２……整流装置、
３２ｂ……整流体、４２……整流装置、４２ｂ…
…整流体、５２……整流装置、５２ｂ……整流
体、６２……整流装置、６２ｂ……整流体、７２
……整流装置、７２ｂ……整流体。
1A and 1B show a flow rate measurement system according to an embodiment of the present invention, FIG. 1A is a schematic diagram showing the configuration, and FIG.
Figure b is a cross-sectional view of the rectifier in Figure 1 a;
The figure is a diagram showing the flow pattern on the outlet side of the rectifier shown in Figure 1a, and Figure 3 is a diagram for explaining the relationship between the electromotive force and flow velocity of the electromagnetic flow meter detector.
Figure 4 is an explanatory diagram of the weighting function of the electromotive force in the electromagnetic flowmeter detector, and Figures 5 to 7 respectively show different flows of axisymmetric flow that are allowed in order to perform accurate measurement in the flow measurement system of the present invention. Figures 8 to 13 are schematic diagrams showing different modifications of the rectifier in the flow rate measurement system of the present invention, and Figures 14 to 18 are diagrams showing the rectifier in the flow rate measurement system of the present invention, respectively. Schematic diagram showing different modifications of the flow regulator, No. 19
Figures a and b show a conventional example of a flow rate measurement system using a rectifier tube, where Figure 19a is a schematic diagram showing the configuration, and Figure 19b is a sectional view of the rectifier tube in Figure 19a. 1... Electromagnetic flowmeter detector, 12... Rectifier,
12a...Outer peripheral tube wall, 12b...Regulating fluid, 12c
... fixed arm, 13 ... flow disturbance element, 22 ... rectifier, 22b ... rectifier, 32 ... rectifier,
32b... rectifier, 42... rectifier, 42b...
... rectifier, 52... rectifier, 52b... rectifier, 62... rectifier, 62b... rectifier, 72
... Rectifier, 72b... Fluid rectifier.
Claims (1)
流量測定が可能な電磁流量計検出器の上流側
に、非軸対称流を流速分布が一様でない軸対称
流に変える整流装置を接続したことを特徴とす
る流量計測システム。 (2) 整流装置が、その外周壁の内側の壁に近い層
に流体軸に対称な整流体を具備した構造である
ことを特徴とする実用新案登録請求の範囲第１
項記載の流量計測システム。 (3) 整流装置が、その断面中央部に流体軸に対称
な整流体を具備した構造であることを特徴とす
る実用新案登録請求の範囲第１項記載の流量計
測システム。[Claim for Utility Model Registration] (1) A non-axisymmetric flow with a non-uniform flow velocity distribution is installed upstream of an electromagnetic flowmeter detector capable of highly accurate flow measurement for an axisymmetric flow with an uneven flow velocity distribution. A flow measurement system characterized by being connected to a rectifier that changes the flow into an axially symmetrical flow. (2) Utility model registration claim 1, characterized in that the flow rectifier has a structure in which a flow rectifier symmetrical to the fluid axis is provided in a layer near the inner wall of the outer circumferential wall of the flow rectifier.
Flow rate measurement system described in section. (3) The flow rate measurement system according to claim 1, wherein the flow rectifier has a structure in which the flow rectifier is provided with a flow rectifier symmetrical to the fluid axis at the center of its cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11337986U JPH0537213Y2 (en) | 1986-07-25 | 1986-07-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11337986U JPH0537213Y2 (en) | 1986-07-25 | 1986-07-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6321818U JPS6321818U (en) | 1988-02-13 |
| JPH0537213Y2 true JPH0537213Y2 (en) | 1993-09-21 |
Family
ID=30995129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11337986U Expired - Lifetime JPH0537213Y2 (en) | 1986-07-25 | 1986-07-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0537213Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5136313B2 (en) * | 2008-09-12 | 2013-02-06 | 富士電機リテイルシステムズ株式会社 | Flow path switching device and hot water supply device having the same |
| DE112015006556T5 (en) * | 2015-05-22 | 2018-03-01 | General Electric Company | Flow mixing cam and associated manufacturing method |
-
1986
- 1986-07-25 JP JP11337986U patent/JPH0537213Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6321818U (en) | 1988-02-13 |
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