JP4663586B2 - Liquid concentration measuring device - Google Patents

Liquid concentration measuring device Download PDF

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JP4663586B2
JP4663586B2 JP2006159881A JP2006159881A JP4663586B2 JP 4663586 B2 JP4663586 B2 JP 4663586B2 JP 2006159881 A JP2006159881 A JP 2006159881A JP 2006159881 A JP2006159881 A JP 2006159881A JP 4663586 B2 JP4663586 B2 JP 4663586B2
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liquid concentration
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JP2007327876A (en
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弘明 岡原
実 山▲崎▼
林　　達也
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JFE Advantech Co Ltd
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本発明は、上下水道や河川の汚泥、パルプ製造を含む一般産業の製造工程等で発生する懸濁物質のような、液体中に含まれる固形物、粒子、コロイド状物質等の濃度（液体濃度）を測定する液体濃度測定装置に関する。   The present invention relates to concentrations of solids, particles, colloidal substances, etc. contained in liquids, such as suspended substances generated in general industrial manufacturing processes including water and sewage systems, river sludge, and pulp manufacturing. ) For measuring liquid concentration.

この種の液体濃度測定装置の測定原理としては、マイクロ波式や超音波減衰式等に加え、光学式が知られている。光学式の液体濃度測定装置は、光透過率式と散乱光演算式に大別される。また、散乱光演算式は前方散乱光演算式と後方散乱光演算式に分類される。   As a measurement principle of this type of liquid concentration measurement apparatus, an optical method is known in addition to a microwave method, an ultrasonic attenuation method, and the like. Optical liquid concentration measuring devices are roughly classified into a light transmittance formula and a scattered light calculation formula. The scattered light calculation formula is classified into a forward scattered light calculation formula and a back scattered light calculation formula.

後方散乱光演算式の液体濃度測定装置は、例えば特許文献１〜３に記載されているように、発光素子と受光素子を並べて配置した検出部を備え、散乱光の強度により液体中の汚泥等の濃度を測定する。図７に示すように、従来の後方散乱光演算式の液体濃度測定装置では、検出部１は例えば配管２を流れる被測定流体の流れの方向Ｆに対して平行に配置されている。液体の種類、濃度等により異なるが、被測定流体中に含まれる汚泥等の固形物、被測定流体からの析出物等が、検出部１に付着して層を形成して覆い隠してしまう場合がある。この場合、発光素子からの光の放射や、被測定流体からの散乱光の受光素子による受光を妨げることにより、濃度測定の精度低下や測定不能を招く。   As described in Patent Documents 1 to 3, for example, the backscattered light calculation type liquid concentration measuring apparatus includes a detection unit in which a light emitting element and a light receiving element are arranged side by side, and sludge in liquid depending on the intensity of scattered light. Measure the concentration. As shown in FIG. 7, in the conventional backscattered light calculation type liquid concentration measurement device, the detection unit 1 is arranged in parallel to the flow direction F of the fluid to be measured flowing through the pipe 2, for example. When depending on the type, concentration, etc. of the liquid, solids such as sludge contained in the fluid to be measured, precipitates from the fluid to be measured adhere to the detection unit 1 and form a layer to cover it There is. In this case, the light emission from the light emitting element and the scattered light from the fluid to be measured are prevented from being received by the light receiving element, thereby causing a decrease in the accuracy of concentration measurement and inability to measure.

検出部１への付着物に対する対策として、図８に示す自動洗浄機構５が知られている。この例では、液体濃度測定装置６のケーシング７は、ケーシング本体７ａと、このケーシング本体７ａから延びて先端に検出部１を備えるロッド状部７ｂとを備える。ロッド状部７ｂは、検出部１が配管２内に配置されるように配管２からの分岐管８に差し込まれている。ケーシング本体７ａはボールバルブ９とシール部１０を介して分岐管８に取り付けられている。自動洗浄機構５は検出部１の付近で配管２に開口する洗浄管１１を備え、この洗浄管１１から高圧の洗浄水１２を吹き付けることで検出部１から付着物を剥離させて洗い流す。   An automatic cleaning mechanism 5 shown in FIG. 8 is known as a countermeasure against the deposits on the detection unit 1. In this example, the casing 7 of the liquid concentration measuring device 6 includes a casing body 7a and a rod-shaped portion 7b that extends from the casing body 7a and includes the detection unit 1 at the tip. The rod-shaped part 7 b is inserted into the branch pipe 8 from the pipe 2 so that the detection part 1 is arranged in the pipe 2. The casing body 7 a is attached to the branch pipe 8 via a ball valve 9 and a seal portion 10. The automatic cleaning mechanism 5 includes a cleaning pipe 11 that opens to the pipe 2 in the vicinity of the detection unit 1, and sprays high-pressure cleaning water 12 from the cleaning pipe 11 to peel off and remove the deposits from the detection unit 1.

しかし、図８に示す自動洗浄機構５では液体濃度測定装置６による測定動作を停止した状態で洗浄動作を行う必要がある。そのため、特に付着物の量が多い場合には、洗浄動作の間隔を短く設定して頻繁に測定を中断する必要が生じ、洗浄水も多量に必要となる。また、効果的な洗浄を行うには配管２内の圧力よりも十分に高い圧力で多量の洗浄水１２を検出部１に吹き付ける必要があるが、洗浄水の圧力や量が不足し検出部１を適切に洗浄できない場合がある。例えば、洗浄水１２を噴射することで配管２内の被測定液体３の濃度が低下するので、用途や運転条件によっては噴射に使用できる洗浄水１２の量が制限される。また、配管２に自動の仕切弁が設けられている等の理由で配管２内の流量が制限されるために、十分な量の洗浄水１２を噴射できない場合もある。   However, in the automatic cleaning mechanism 5 shown in FIG. 8, it is necessary to perform the cleaning operation while the measurement operation by the liquid concentration measuring device 6 is stopped. For this reason, particularly when the amount of deposits is large, it is necessary to interrupt the measurement frequently by setting the interval of the cleaning operation short, and a large amount of cleaning water is also required. In order to perform effective cleaning, it is necessary to spray a large amount of cleaning water 12 to the detection unit 1 at a pressure sufficiently higher than the pressure in the pipe 2, but the pressure and amount of the cleaning water are insufficient and the detection unit 1 May not be properly cleaned. For example, since the concentration of the liquid 3 to be measured in the pipe 2 is reduced by injecting the cleaning water 12, the amount of the cleaning water 12 that can be used for the injection is limited depending on the application and operating conditions. In addition, since the flow rate in the pipe 2 is limited because an automatic gate valve is provided in the pipe 2, a sufficient amount of the washing water 12 may not be injected.

図８に示す洗浄機構で効果的に洗浄できない場合には、検出部１から付着物を拭き取る作業を頻繁に行う必要がある。具体的には、作業者が分岐管８から液体濃度測定装置６のロッド状部７ｂを引き抜き、検出部１に付いた付着物を手作業で取り除く必要がある。しかし、人手による作業は非常に煩雑であるだけでなく、拭き取り作業中は測定動作を停止する必要がある。   When the cleaning mechanism shown in FIG. 8 cannot be used for effective cleaning, it is necessary to frequently perform an operation of wiping off the deposits from the detection unit 1. Specifically, it is necessary for the operator to pull out the rod-shaped portion 7b of the liquid concentration measuring device 6 from the branch pipe 8, and to manually remove the deposits attached to the detection unit 1. However, the manual operation is not only very complicated, but it is necessary to stop the measuring operation during the wiping operation.

以上のように従来のこの種の液体濃度測定装置では、検出部１を効果的に洗浄して付着物を除去することが困難であるため、長期間の連続した濃度測定の実現は困難である。   As described above, in this type of conventional liquid concentration measurement device, it is difficult to effectively clean the detection unit 1 and remove the deposits, so that it is difficult to realize continuous concentration measurement for a long period of time. .

特開２００２−９８６３７号公報JP 2002-98637 A 特開２００２−３６５２１６号公報JP 2002-365216 A 特開２００５−１２７９８０号公報JP 2005-127980 A

前記従来の液体濃度測定装置における問題に鑑み、本発明は簡易な構成で効果的に検出部への汚泥等の付着を防止し、長期間の連続した濃度測定を実現可能とすることを課題とする。   In view of the problems in the conventional liquid concentration measuring device, the present invention has an object of effectively preventing sludge and the like from adhering to the detection unit with a simple configuration and realizing continuous concentration measurement for a long period of time. To do.

種々の試験等の結果、液体濃度測定装置６の検出部１付近への付着物１３の付着には一定の傾向があることを本発明者は新たに見出した。具体的には、図９に示すように付着物１３はロッド状部７ｂの先端のうち主として被測定流体の流れ方向Ｆの下流側を向いた部分に付着し、その結果検出部１が付着物１３で覆われる。しかし、ロッド状部７ｂの先端であっても被測定流体の流れ方向Ｆの上流側を向いた部分への付着物１３の付着は極めて少ない。本発明はかかる新たな知見に基づいてなされたものである。   As a result of various tests and the like, the present inventor newly found that there is a certain tendency for the deposit 13 to adhere to the vicinity of the detection unit 1 of the liquid concentration measuring device 6. Specifically, as shown in FIG. 9, the adhering matter 13 adheres mainly to a portion of the tip of the rod-like portion 7b facing the downstream side in the flow direction F of the fluid to be measured. 13 is covered. However, even if it is the front-end | tip of the rod-shaped part 7b, the adhesion of the deposit | attachment 13 to the part which faced the upstream of the flow direction F of the fluid to be measured is very small. The present invention has been made based on such new findings.

本発明は、被測定流体が流れる配管内に配置され、前記被測定流体に光を照射する発光部と、前記被測定流体中に含まれる固形物等で反射された散乱光が入射する受光部とが設けられた検出部を備える液体濃度測定装置であって、前記配管内に差し込まれたロッド状部の先端に前記検出部が設けられ、前記ロッド状部の先端は半球状であり、前記検出部は、凸面状であり、前記被測定流体の流れ方向の上流側を向き、かつ前記被測定流体の流れ方向に対して傾斜している、液体濃度測定装置を提供する。
The present invention is arranged in a pipe through which a fluid to be measured flows, and a light emitting unit that irradiates light to the fluid to be measured, and a light receiving unit that receives scattered light reflected by a solid substance or the like contained in the fluid to be measured A liquid concentration measuring device comprising a detection part provided with the detection part provided at the tip of a rod-like part inserted into the pipe, the tip of the rod-like part being hemispherical, detector is a convex surface shape, the orientation of the upstream side in the flow direction of the fluid to be measured, and the inclined with respect to the flow direction of the fluid to be measured, to provide a liquid density measurement device.

検出部は被測定流体の流れ方向の上流側を向いているので、汚泥等の付着を効果的に防止できる。換言すれば、検出部は高い自己洗浄機能を有し、汚泥等の付着物の付着が極めて少ない。この自己洗浄機能は、流れ方向の上流側を向いた検出部に対し、被測定流体の流れが比較的高い速度を維持した状態で衝突することによると推察される。また、検出部は被測定流体の流れ方向に対して傾斜しているので、被測定流体中の夾雑物等が検出部で捕捉されたとしても、被測定流体の流れによって押し流されて速やかに検出部から離脱する。換言すれば、検出部に夾雑物が引っ掛かった状態が継続するのを防止できる。   Since the detection unit faces the upstream side in the flow direction of the fluid to be measured, adhesion of sludge and the like can be effectively prevented. In other words, the detection unit has a high self-cleaning function, and deposits such as sludge are extremely small. This self-cleaning function is presumed to be due to the collision of the flow of the fluid to be measured while maintaining a relatively high velocity against the detection unit facing the upstream side in the flow direction. In addition, since the detection unit is inclined with respect to the flow direction of the fluid to be measured, even if foreign matter in the fluid to be measured is captured by the detection unit, it is quickly detected by being swept away by the flow of the fluid to be measured. Leave the club. In other words, it is possible to prevent the state in which the foreign substance is caught on the detection unit from continuing.

本発明の液体濃度測定装置では、検出部を被測定流体の流れ方向の上流側に向けるという簡易な構成で効果的に検出部への付着を防止でき、長期間の連続した濃度測定が可能である。   In the liquid concentration measuring apparatus of the present invention, the detection unit can be effectively prevented from adhering to the detection unit with a simple configuration in which the detection unit is directed upstream in the flow direction of the fluid to be measured, and continuous concentration measurement for a long period of time is possible. is there.

次に、添付図面を参照して本発明の実施形態を詳細に説明する。   Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

図１から図３は、本発明の実施形態に係る液体濃度測定装置６を示す。なお、これらの図面において、図７から図９に示す従来の液体濃度測定装置６と同一の要素には同一の符号をしている。   1 to 3 show a liquid concentration measuring device 6 according to an embodiment of the present invention. In these drawings, the same elements as those of the conventional liquid concentration measuring apparatus 6 shown in FIGS. 7 to 9 are denoted by the same reference numerals.

図３を参照すると、ケーシング本体７ａ内には、発光ダイオード等の発光素子２１、発光素子２１を駆動するための発光回路２２、フォトダイオード等からなり光電変換を行う受光素子２３、及び受光素子２３を駆動するための受光回路２４が収容されている。発光素子２１が放射する光を被測定流体３まで導くために、光ファイバ等からなる出力側導波部２６が設けられている。この出力側導波部２６は発光素子２１からロッド状部７ｂの先端まで延びており、ロッド状部７ｂの先端面で露出した出力側導波部２６の端面は発光部２８として機能する。また、被測定流体３中の粒子２９により散乱した散乱光を受光して受光素子２３に導くために、光ファイバ等からなる入力側導波部２７が設けられている。この入力側導波部２７は受光素子２３からロッド状部７ｂの先端まで延びており、ロッド状部７ｂの先端面で露出して入力側導波部２７の端面は受光部３０として機能する。受光回路２４と発光回路２２はケーブル３１により変換回路、演算回路等を含む外部回路（図示せず）に接続されている。発光部２８から被測定流体３中に光が照射され、被測定流体３中に浮遊する固形物ないしは粒子２９で反射された後方散乱光は受光部３０に入射する。受光素子２３によって散乱光の強度が検出され、この強度が所定の演算により濃度に換算される。   Referring to FIG. 3, in the casing body 7 a, a light emitting element 21 such as a light emitting diode, a light emitting circuit 22 for driving the light emitting element 21, a light receiving element 23 configured to perform photoelectric conversion, and a light receiving element 23. A light receiving circuit 24 for driving is housed. In order to guide the light emitted from the light emitting element 21 to the fluid 3 to be measured, an output-side waveguide unit 26 made of an optical fiber or the like is provided. The output-side waveguide portion 26 extends from the light emitting element 21 to the tip of the rod-shaped portion 7 b, and the end surface of the output-side waveguide portion 26 exposed at the tip surface of the rod-shaped portion 7 b functions as the light-emitting portion 28. Further, in order to receive the scattered light scattered by the particles 29 in the fluid 3 to be measured and guide the scattered light to the light receiving element 23, an input side waveguide section 27 made of an optical fiber or the like is provided. The input side waveguide portion 27 extends from the light receiving element 23 to the tip of the rod-shaped portion 7 b, is exposed at the tip surface of the rod-shaped portion 7 b, and the end surface of the input-side waveguide portion 27 functions as the light receiving portion 30. The light receiving circuit 24 and the light emitting circuit 22 are connected by a cable 31 to an external circuit (not shown) including a conversion circuit, an arithmetic circuit, and the like. The light to be measured 3 is emitted from the light emitting unit 28 and the backscattered light reflected by the solid matter or particles 29 floating in the fluid 3 to be measured enters the light receiving unit 30. The light receiving element 23 detects the intensity of the scattered light, and this intensity is converted into a concentration by a predetermined calculation.

図２Ａ，Ｂを参照すると、被測定流体３が流れる配管２内に配置されているロッド状部７ｂの半球状の最先端部７ｃには、円形の平面からなる検出部１が設けられている。検出部１の中央には受光部３０が配置され、その周囲には受光部３０を中心とする円周上に間隔をあけて６個の発光部２８が配置されている。   Referring to FIGS. 2A and 2B, the hemispherical tip 7c of the rod-like portion 7b disposed in the pipe 2 through which the fluid 3 to be measured flows is provided with a detection unit 1 having a circular plane. . A light receiving unit 30 is arranged at the center of the detection unit 1, and six light emitting units 28 are arranged around the circumference around the light receiving unit 30 at intervals.

図２Ａに最も明瞭に示すように、検出部１は被測定流体３の流れ方向Ｆの上流側を向き、かつ流れ方向Ｆに対して傾斜するように配置されている。流れ方向Ｆに対する検出部１の傾き角度θは特に限定されないが、例えば３０〜６０度程度に設定される。また、本実施形態では、検出部１はロッド状部７ｂの最先端部７ｃのうち流れ方向Ｆの半分よりも上流側（図２Ａにおいてロッド状部７ｂの中心軸Ｌよりも右側）に収まるように設けられている。さらに、本実施形態では検出部１は被測定流体３の流れ方向Ｆに対して正対している。換言すれば、図２Ｂで示すように流れ方向Ｆの上流側から見ると、検出部１の法線Ｎ（図２Ａ参照）がロッド状部７ｂの中心軸Ｌと一致している。しかし、検出部１は図２Ｂにおいて矢印Ｙで示すように中心軸Ｌ回りに若干回転させた姿勢に設定してもよい。また、本実施形態ではロッド状部７ｂの先端のうち半球状の最先端部７ｃのみが配管２の内面に位置しているが、図２Ｃに示すように最先端部７ｃのみでなく最先端部７ｃよりも基端側の部位のロッド状部分７ｂが配管２の内面に露出していてもよい。   As most clearly shown in FIG. 2A, the detection unit 1 is arranged to face the upstream side in the flow direction F of the fluid 3 to be measured and to be inclined with respect to the flow direction F. The inclination angle θ of the detection unit 1 with respect to the flow direction F is not particularly limited, but is set to about 30 to 60 degrees, for example. Moreover, in this embodiment, the detection part 1 is settled in the upstream side (the right side rather than the central axis L of the rod-shaped part 7b in FIG. 2A) among the most distal part 7c of the rod-shaped part 7b from the half of the flow direction F. Is provided. Further, in the present embodiment, the detection unit 1 faces the flow direction F of the fluid 3 to be measured. In other words, when viewed from the upstream side in the flow direction F as shown in FIG. 2B, the normal line N (see FIG. 2A) of the detection unit 1 coincides with the central axis L of the rod-shaped portion 7b. However, the detection unit 1 may be set to a posture slightly rotated around the central axis L as indicated by an arrow Y in FIG. 2B. Further, in the present embodiment, only the hemispherical most distal end portion 7c of the tip of the rod-shaped portion 7b is located on the inner surface of the pipe 2, but not only the most distal end portion 7c but the most distal end portion as shown in FIG. 2C. The rod-like portion 7b at the base end side of 7c may be exposed on the inner surface of the pipe 2.

検出部１は被測定流体３の流れ方向Ｆの上流側を向いているので、被測定流体３に含まれる汚泥等の付着を効果的に防止できる。換言すれば、検出部１は高い自己洗浄機能を有し、汚泥等の付着物の付着が極めて少ない。このように、本実施形態の液体濃度測定装置６は、検出部１を被測定流体３の流れ方向Ｆの上流側を向けるという極めて簡易な構成により検出部１への汚泥等の付着を効果的に防止する自己洗浄機能を実現している。従って、長期間にわたって検出部１の手作業により払拭作業等を行うことなく連続的に被測定流体３の濃度測定を実行できる。   Since the detection unit 1 faces the upstream side in the flow direction F of the fluid 3 to be measured, it is possible to effectively prevent the adhesion of sludge and the like contained in the fluid 3 to be measured. In other words, the detection unit 1 has a high self-cleaning function, and adhesion of deposits such as sludge is extremely small. As described above, the liquid concentration measuring apparatus 6 of the present embodiment effectively attaches sludge and the like to the detection unit 1 with an extremely simple configuration in which the detection unit 1 is directed upstream in the flow direction F of the fluid 3 to be measured. The self-cleaning function is prevented. Accordingly, it is possible to continuously measure the concentration of the fluid 3 to be measured without performing a wiping operation or the like manually by the detection unit 1 over a long period of time.

検出部１の自己洗浄機能は、流れ方向Ｆの上流側を向いた検出部１に対して被測定流体３の流れが比較的高い速度を維持した状態で衝突することによるものであると推察される。従って、前述のように検出部１をロッド状部７ｂの最先端部７ｃのうち流れ方向Ｆの半分よりも上流側（図２Ａにおいてロッド状部７ｂの中心軸Ｌよりも右側）に収まるように設け、検出部１に対して高速の被測定流体３を確実に衝突させる必要がある。換言すれば、検出部１は流れ方向Ｆの上流側から見た場合に（図２Ｂ参照）、その全体が見えるように設ける必要がある。   The self-cleaning function of the detection unit 1 is presumed to be due to the fact that the flow of the fluid 3 to be measured collides with the detection unit 1 facing the upstream side in the flow direction F while maintaining a relatively high velocity. The Therefore, as described above, the detection unit 1 is located on the upstream side of the most distal portion 7c of the rod-shaped portion 7b with respect to the half in the flow direction F (on the right side of the central axis L of the rod-shaped portion 7b in FIG. 2A). It is necessary to ensure that the high-speed fluid 3 to be measured collides with the detection unit 1. In other words, the detection unit 1 needs to be provided so that the entire detection unit 1 can be seen when viewed from the upstream side in the flow direction F (see FIG. 2B).

検出部１は被測定流体３の流れ方向Ｆに対して傾斜している。そのため、被測定流体３中の夾雑物等が検出部で捕捉されたとしても、被測定流体３の流れによって押し流されて速やかに検出部１から離脱する。このように、検出部１は被測定流体３の流れ方向Ｆに対して傾斜させることで、検出部１への夾雑物等の引っ掛かりを効果的に防止できる。その結果、検出部１に夾雑物が引っ掛かった状態が継続し、それに起因して測定精度が低下たり測定不能となるのを防止できる。   The detector 1 is inclined with respect to the flow direction F of the fluid 3 to be measured. For this reason, even if foreign matter or the like in the measured fluid 3 is captured by the detection unit, it is pushed away by the flow of the measured fluid 3 and quickly leaves the detection unit 1. In this manner, the detection unit 1 can be effectively prevented from being caught by foreign substances or the like on the detection unit 1 by being inclined with respect to the flow direction F of the fluid 3 to be measured. As a result, it is possible to prevent a state in which the foreign substance is caught on the detection unit 1 and prevent the measurement accuracy from being lowered or impossible to measure due to the state.

図４Ａ，Ｂは、本実施形態の液体濃度測定装置６を連続使用する試験に供した後のロッド状部７ｂの最先端部７ｃへの汚泥の付着状況を示す。試験条件としては、内径１００ｍｍの円管からなる配管２中に被測定液体３として重力濃縮汚泥を１５ｍ３／ｈ流し、約２週間連続使用した。これら図４Ａ，Ｂより明らかなように、ロッド状部７ｂの最先端部７ｃのうち流れ方向Ｆの下流側には汚泥３２の付着が認められるが、最先端部７ｃのうち流れ方向Ｆの上流側に設けている検出部１には汚泥の付着は認められない。この試験結果から、本実施形態の液体濃度測定装置６は検出部１の自己洗浄機能を有していることが確認できる。 4A and 4B show the state of adhesion of sludge to the most distal portion 7c of the rod-like portion 7b after being subjected to a test for continuously using the liquid concentration measuring device 6 of the present embodiment. As test conditions, gravity-concentrated sludge was flowed at 15 m 3 / h as a liquid to be measured 3 in a pipe 2 made of a circular pipe having an inner diameter of 100 mm and used continuously for about 2 weeks. As is clear from FIGS. 4A and 4B, the sludge 32 is adhering to the downstream side in the flow direction F of the most distal portion 7c of the rod-like portion 7b, but the upstream of the flow direction F in the most distal portion 7c. Adhering of sludge is not recognized in the detection unit 1 provided on the side. From this test result, it can be confirmed that the liquid concentration measuring device 6 of the present embodiment has the self-cleaning function of the detection unit 1.

図５Ａ，Ｂは、図４Ａ，Ｂの場合と同一の条件下で、かつ自動洗浄機構５（図８参照）を１時間間隔で動作させて洗浄水による洗浄を実行した場合の、ロッド状部７ｂの最先端部７ｃへの汚泥の付着状況を示す。これら図５Ａ，Ｂから明らかなように、検出部１には汚泥の付着は認められず、かつロッド状部７ｂの最先端部７ｃのうち流れ方向Ｆの下流側への汚泥３２の付着量も低減している。この試験結果から、本実施形態の液体濃度測定装置６を自動洗浄機構５と組み合わせて使用することにより、より長期間にわたる連続した濃度測定が可能となる。   5A and 5B show the rod-shaped portion when the cleaning is performed with the cleaning water under the same conditions as in FIGS. 4A and 4B and by operating the automatic cleaning mechanism 5 (see FIG. 8) at intervals of 1 hour. The adhesion state of the sludge to the most advanced part 7c of 7b is shown. As is apparent from FIGS. 5A and 5B, no sludge adheres to the detection unit 1, and the amount of sludge 32 attached to the downstream side in the flow direction F of the most distal portion 7c of the rod-like portion 7b is also shown. Reduced. From this test result, by using the liquid concentration measuring device 6 of the present embodiment in combination with the automatic cleaning mechanism 5, it is possible to perform continuous concentration measurement over a longer period of time.

図６Ａ，Ｂは本発明の他の実施形態を示す。この実施形態では、検出部１は円筒状のロッド状部７ｂを斜めに横切る楕円状の平面としている。この実施形態のその他の構成及び作用は前述のものと同一である。   6A and 6B show another embodiment of the present invention. In this embodiment, the detection unit 1 is an elliptical plane that obliquely crosses the cylindrical rod-shaped portion 7b. Other configurations and operations of this embodiment are the same as those described above.

本発明は前記実施形態に限定されず種々の変形が可能である。例えば、前記実施形態ではいずれも検出部１は平面であるが、検出部は被測定流体３の流れ方向Ｆの上流側に向かって突出する凸面状であってもよい。また、本発明は実施形態のように円管からなる配管２に限定されず、断面形状が矩形等の多角形の管等にも適用でき、管以外の開渠、暗渠、液槽等を流れる被測定流体の濃度測定についても本発明を適用できる。さらに、検出部１は実施形態のもののように配管２内の側方に配置されている必要はなく（図１参照）、配管２内の上方や下方に検出部１が配置されていてもよい。   The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, in all of the embodiments, the detection unit 1 is a flat surface, but the detection unit may have a convex shape protruding toward the upstream side in the flow direction F of the fluid 3 to be measured. Further, the present invention is not limited to the pipe 2 made of a circular pipe as in the embodiment, but can be applied to a polygonal pipe having a cross-sectional shape such as a rectangle, and flows through an open channel, a culvert, a liquid tank, etc. other than the pipe. The present invention can also be applied to the measurement of the concentration of the fluid to be measured. Furthermore, the detection unit 1 does not need to be arranged on the side in the pipe 2 as in the embodiment (see FIG. 1), and the detection unit 1 may be arranged above or below the pipe 2. .

本発明の実施形態に係る液体濃度測定装置を取り付けた配管の模式的な断面図。The typical sectional view of piping which attached the liquid concentration measuring device concerning the embodiment of the present invention. 図１のII−II線での部分断面図。The fragmentary sectional view in the II-II line of FIG. 被測定流体の流れ方向上流側から見た検出部付近の部分断面図。The fragmentary sectional view of the detection part vicinity seen from the flow direction upstream of the fluid to be measured. 配管の内面に対するロッド状部の最先端部の配置の代案を示す部分断面図。The fragmentary sectional view which shows the alternative of arrangement | positioning of the most advanced part of the rod-shaped part with respect to the inner surface of piping. 液体濃度測定装置の模式的な断面図。A typical sectional view of a liquid concentration measuring device. 被測定流体の流れ方向を側方から見た本実施形態の液体濃度測定装置における検出部付近への汚泥の付着状態を示す模式的な斜視図（自動洗浄を行わない場合）。The typical perspective view which shows the adhesion state of the sludge to the detection part vicinity in the liquid concentration measuring apparatus of this embodiment which looked at the flow direction of the to-be-measured fluid from the side (when not performing automatic washing | cleaning). 被測定流体の流れ方向上流側から見た本発明の液体測定装置における検出部付近への汚泥の付着状態を示す模式的な斜視図（自動洗浄を行わない場合）。The typical perspective view which shows the adhesion state of the sludge to the detection part vicinity in the liquid measuring device of this invention seen from the flow direction upstream of to-be-measured fluid (when not performing automatic washing | cleaning). 被測定流体の流れ方向を側方から見た本実施形態の液体測定装置における検出部付近への汚泥の付着状態を示す模式的な斜視図（自動洗浄を行った場合）。The typical perspective view which shows the adhesion state of the sludge to the detection part vicinity in the liquid measuring device of this embodiment which looked at the flow direction of the to-be-measured fluid from the side (when automatic cleaning is performed). 被測定流体の流れ方向上流側から見た本発明の液体測定装置における検出部付近への汚泥の付着状態を示す模式的な斜視図（自動洗浄を行った場合）。The typical perspective view which shows the adhesion state of the sludge to the detection part vicinity in the liquid measuring device of this invention seen from the flow direction upstream of the fluid to be measured (when automatic cleaning is performed). 被測定流体の流れ方向を側方から見た本発明の変形例に係る液体濃度測定装置の検出部付近の部分断面図。The fragmentary sectional view of the detection part vicinity of the liquid concentration measuring apparatus which concerns on the modification of this invention which looked at the flow direction of the to-be-measured fluid from the side. 被測定流体の流れ方向上流側から見た本発明の本発明の他の実施形態に係る液体濃度測定装置の検出部付近の部分断面図。The fragmentary sectional view of the detection part vicinity of the liquid concentration measuring apparatus which concerns on other embodiment of this invention of this invention seen from the flow direction upstream of the fluid to be measured. 被測定流体の流れ方向を側方から見た従来の液体濃度測定装置の検出部付近の部分断面図。The fragmentary sectional view of the detection part vicinity of the conventional liquid concentration measuring apparatus which looked at the flow direction of the to-be-measured fluid from the side. 従来の液体濃度測定装置を取り付けた配管の模式的な断面図。Typical sectional drawing of piping which attached the conventional liquid concentration measuring apparatus. 被測定流体の流れ方向を側方から見た従来の液体濃度測定装置の検出部付近の模式的な斜視図。The typical perspective view of the detection part vicinity of the conventional liquid concentration measuring apparatus which looked at the flow direction of the to-be-measured fluid from the side.

符号の説明Explanation of symbols

１ 検出部
２ 配管
３ 被測定流体
５ 自動洗浄機構
６ 液体濃度測定装置
７ ケーシング
７ａ ケーシング本体
７ｂ ロッド状部
７ｃ 最先端部
８ 分岐管
９ ボールバルブ
１０ シール部
１１ 洗浄管
１２ 洗浄水
１３ 付着物
２１ 発光素子
２２ 発光回路
２３ 受光素子
２４ 受光回路
２６ 出力側導波路
２７ 入力側導波路
２８ 発光部
２９ 粒子
３０ 受光部
３１ ケーブル
３２ 汚泥
Ｆ 流れの方向 DESCRIPTION OF SYMBOLS 1 Detection part 2 Piping 3 Fluid to be measured 5 Automatic washing mechanism 6 Liquid concentration measuring device 7 Casing 7a Casing body 7b Rod-like part 7c Most advanced part 8 Branch pipe 9 Ball valve 10 Sealing part 11 Washing pipe 12 Washing water 13 Deposit 21 Light emitting element 22 Light emitting circuit 23 Light receiving element 24 Light receiving circuit 26 Output side waveguide 27 Input side waveguide 28 Light emitting part 29 Particle 30 Light receiving part 31 Cable 32 Sludge F Flow direction

Claims (1)

被測定流体が流れる配管内に配置され、前記被測定流体に光を照射する発光部と、前記被測定流体中に含まれる固形物等で反射された散乱光が入射する受光部とが設けられた検出部を備える液体濃度測定装置であって、
前記配管内に差し込まれたロッド状部の先端に前記検出部が設けられ、
前記ロッド状部の先端は半球状であり、
前記検出部は、凸面状であり、前記被測定流体の流れ方向の上流側を向き、かつ前記被測定流体の流れ方向に対して傾斜している、液体濃度測定装置。 A light emitting unit that is disposed in a pipe through which the fluid to be measured flows and irradiates light to the fluid to be measured, and a light receiving unit that receives scattered light reflected by a solid substance or the like contained in the fluid to be measured are provided. A liquid concentration measuring device comprising a detection unit,
The detection part is provided at the tip of a rod-like part inserted into the pipe,
The tip of the rod-shaped part is hemispherical,
Wherein the detection unit is a convex surface shape, the orientation of the upstream side in the flow direction of the fluid to be measured, and the inclined with respect to the flow direction of the fluid to be measured, the liquid concentration measuring device.
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JPH0331778U (en) * 1989-08-08 1991-03-27
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JPH0559295U (en) * 1992-01-20 1993-08-06 勉 安田 Physical quantity detector for sludge
JPH09178654A (en) * 1995-12-25 1997-07-11 Chino Corp Measuring method for sludge moisture
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