JPH0553455U - Micro flow rate adjusting device for chemicals - Google Patents
Micro flow rate adjusting device for chemicalsInfo
- Publication number
- JPH0553455U JPH0553455U JP113361U JP11336191U JPH0553455U JP H0553455 U JPH0553455 U JP H0553455U JP 113361 U JP113361 U JP 113361U JP 11336191 U JP11336191 U JP 11336191U JP H0553455 U JPH0553455 U JP H0553455U
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- mixed
- bypass
- main pipe
- bypass 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.)
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Classifications
-
- Y02P60/216—
Landscapes
- Fertilizing (AREA)
- Catching Or Destruction (AREA)
- Hydroponics (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
(57)【要約】
【目的】 通常の流量を検出する流量センサだけを用い
て、原水への微小な流量の薬液の混入調整を可能にする
装置を提供する。
【構成】 バイパス流路21の流量を、バイパス流量セ
ンサ22とバイパス流量制御バルブ23で一定に保ち、
混合流量センサ24に通常流量の範囲でオフセット値を
与える。そして、主管20に設けた主管流量センサ30
と、上記した混合流量センサ24の各流量比をコントロ
ーラ28によって演算し、オフセット値に対する微小な
流量変化を検出することで、薬液管27に設けた混合流
量制御バルブ25の制御を行う。
(57) [Summary] [Purpose] To provide an apparatus capable of adjusting the mixing of a minute flow rate of a chemical solution into raw water by using only a flow rate sensor that detects a normal flow rate. [Configuration] The flow rate of the bypass flow passage 21 is kept constant by a bypass flow rate sensor 22 and a bypass flow rate control valve 23,
An offset value is given to the mixed flow rate sensor 24 in the range of the normal flow rate. Then, the main pipe flow sensor 30 provided in the main pipe 20.
Then, the controller 28 calculates the respective flow rate ratios of the mixed flow rate sensor 24 and detects a minute flow rate change with respect to the offset value, thereby controlling the mixed flow rate control valve 25 provided in the chemical liquid pipe 27.
Description
【0001】[0001]
本考案は、自動灌水システムや水耕栽培システム等において、任意流量の液体 肥料等の薬液を一定の割合で稀釈混入させる装置に関し、特に、高価な高感度精 密流量センサを用いることなく、廉価な一般普及型流量センサを適宜組み合わせ ることにより、高感度精密流量センサを用いたシステムと同等の精度で薬液の微 小流量を調整することができる装置に関するものである。 The present invention relates to a device for diluting and mixing a chemical liquid such as liquid fertilizer at an arbitrary flow rate at a constant ratio in an automatic irrigation system, a hydroponic cultivation system, etc., in particular, without using an expensive high-sensitive precise flow sensor, The present invention relates to a device capable of adjusting a minute flow rate of a chemical solution with the same accuracy as a system using a high-sensitivity precision flow rate sensor by appropriately combining general popular type flow rate sensors.
【0002】[0002]
自動灌水システムや水耕栽培システム等を用いて野菜等の植物を栽培する場合 、液体肥料等の薬液を一定の所望する分量で原水に混入させるシステムには様々 なものが提案されている。例えば、実開昭64−429号公報を挙げることがで きる。同公報は図2に示されるように、主管1を流れる原水の流量をパルス式の 主管流量センサ2で検出し、一方、液体肥料は、液肥タンク6よりポンプ7で加 圧されて送り出され、主管1で合流して混合されると同時に、液体肥料の流量も パルス式の液肥流量センサ3で検出される。そして、これらの両センサ2、3の 検出結果は、コントローラ4に逐次送られて比較演算され、外部倍率設定用パル ス発振器8で定められた稀釈比(液体肥料流量)となるように制御バルブ5が調 整される。 つまり、各流量センサ2及び3の検出値の比率によって予定の指示倍率が決定 されるものであり、この指示倍率の範囲等は個々の流量センサ2及び3の特性に よって左右されるところが大きく、その倍率も一般的には、数100〜1000 倍程度である。 When cultivating plants such as vegetables using an automatic irrigation system, a hydroponic cultivation system, etc., various systems have been proposed for mixing a chemical solution such as a liquid fertilizer into raw water in a desired amount. For example, Japanese Utility Model Laid-Open No. 64-429 can be cited. In the publication, as shown in FIG. 2, the flow rate of the raw water flowing through the main pipe 1 is detected by a pulse type main pipe flow rate sensor 2, while the liquid fertilizer is sent from a liquid fertilizer tank 6 under pressure by a pump 7. The flow rate of the liquid fertilizer is also detected by the pulse type liquid fertilizer flow rate sensor 3 at the same time when the main pipe 1 merges and mixes. Then, the detection results of these two sensors 2 and 3 are sequentially sent to the controller 4 for comparison calculation, and the control valve is controlled so that the dilution ratio (liquid fertilizer flow rate) determined by the external magnification setting pulse oscillator 8 is obtained. 5 is adjusted. That is, the ratio of the detection values of the respective flow rate sensors 2 and 3 determines the predetermined designated magnification, and the range of this designated magnification is largely dependent on the characteristics of the individual flow rate sensors 2 and 3. The magnification is generally about several hundreds to 1000 times.
【0003】[0003]
今日において、自動灌水システムや水耕栽培システム等を用いて野菜等の植物 を栽培する場合、植物の発育段階、発育状態、或は植物の種類等によっては、し ばしば液体肥料等の薬液の供給に細かい配慮、即ち微小な調整が必要とされるこ とがある。また、一般的な植物を栽培する場合でも、近年の液体肥料等の薬液の 高性能化、つまり単位量当りの高濃縮化に伴い、その稀釈比を大きくすることが 要求されている。 Today, when plants such as vegetables are cultivated using an automatic irrigation system or a hydroponic cultivation system, a liquid chemical such as liquid fertilizer is often used depending on the stage of development, the state of development, or the type of plant. There is a need for detailed consideration, that is, a minute adjustment, in the supply of water. Further, even in the case of cultivating general plants, it is required to increase the dilution ratio with the recent improvement in the performance of liquid chemicals such as liquid fertilizers, that is, the higher concentration per unit amount.
【0004】 このような場合、かなり大規模な灌水システムであれば、主管を流れる原水の 流量がかなり多いために稀釈比を上げることは容易であるが、小中規模のシステ ムの場合、ここで用いる液肥流量センサ3には、液体肥料等の薬液の微小な流量 、例えば1分あたり数cc程度からの流量を検出する手段が必要になる。しかし ながら、図3に示すような構成の従来用いられていたような、通常の流量を検出 する一般普及型流量センサでは、その感度の下限が1分あたり数十cc程度であ るため、微小な流量の検出は不可能であった。In such cases, if the irrigation system is fairly large, it is easy to increase the dilution ratio because the flow rate of raw water flowing through the main pipe is quite large. The liquid fertilizer flow rate sensor 3 used in 1) requires a means for detecting a minute flow rate of a chemical liquid such as liquid fertilizer, for example, a flow rate of about several cc per minute. However, in a general-purpose type flow sensor for detecting a normal flow rate, which has a configuration as shown in FIG. 3 and has been conventionally used, the lower limit of its sensitivity is about several tens of cc per minute, so It was impossible to detect a large flow rate.
【0005】 つまり、このような回転式の流量センサ2または3は、ダイナミックレンジ内 では良好なレスポンス、例えば1cc程度の変化量にも敏感に対応するが、この レンジから外れたような非常に低い流量域においては、図3に示すセンサ2、ま たは3において回転板10の軸部13のフリクションロス等により、流体12が 回転板10を回転させることができず、ピックアップ11は正確な検出信号を発 することができず、流体12が流量センサ2または3の一次側14から二次側1 5へリークするという、構造上避けられない問題を有している。That is, such a rotary type flow sensor 2 or 3 sensitively responds to a good response within the dynamic range, for example, a change amount of about 1 cc, but is extremely low outside the range. In the flow rate region, the fluid 12 cannot rotate the rotary plate 10 due to friction loss of the shaft portion 13 of the rotary plate 10 in the sensor 2 or 3 shown in FIG. There is an unavoidable structural problem that the fluid 12 cannot emit a signal and the fluid 12 leaks from the primary side 14 of the flow rate sensor 2 or 3 to the secondary side 15.
【0006】 従って、図2に示すようなシステムで液体肥料の微小な流量調整を行うには、 液肥流量センサ3に低流量域でも安定した動作が得られる、高感度精密流量セン サを搭載することが必要になる。そして、これで得た検出結果と主管流量センサ 2の検出結果をもとに、コントローラ4が液体肥料の制御バルブ5を制御して液 肥の微小な流量を調整することになる。Therefore, in order to adjust the minute flow rate of the liquid fertilizer with the system as shown in FIG. 2, the liquid fertilizer flow rate sensor 3 is equipped with a high-sensitivity precision flow rate sensor capable of obtaining stable operation even in a low flow rate range. Will be needed. Then, the controller 4 controls the liquid fertilizer control valve 5 to adjust the minute flow rate of the liquid fertilizer based on the detection result thus obtained and the detection result of the main pipe flow rate sensor 2.
【0007】 しかしながら、高感度精密流量センサは、それ自体が非常に高価であるばかり か、これに付帯させる検出回路等も複雑化を余儀なくされる。このため、システ ム全体としては非常に高価であると共に、精密な装置であるが故に故障等のトラ ブル発生が増えるなど、設備投資や設備管理の面で農業事業者にとってかなりの 負担を強いることになっていた。However, the high-sensitivity precision flow rate sensor is not only very expensive in itself, but also the detection circuit and the like attached thereto are complicated. For this reason, the system as a whole is extremely expensive, and since it is a precision device, the occurrence of troubles such as breakdowns will increase, which imposes a considerable burden on the farmer in terms of capital investment and facility management. Was becoming.
【0008】 本考案は、このような状況に鑑みて開発されたものであり、その目的とすると ころは、廉価な一般普及型流量センサを適宜組み合わせた簡単な構成により、こ の流量センサの安定動作点、即ちダイナミックレンジ内における良好な特性を有 効に活用することで、高感度精密流量センサと同等の検出精度を得ることができ 、しかも、高感度精密流量センサを用いたシステムに比して遥かに安価な薬液の 微小流量を調整する装置を提供することにある。The present invention has been developed in view of such a situation, and an object thereof is to stabilize the flow sensor by a simple structure in which inexpensive general-purpose type flow sensors are appropriately combined. By effectively utilizing the good characteristics in the operating point, that is, in the dynamic range, it is possible to obtain the detection accuracy equivalent to that of the high-sensitivity precision flow sensor, and moreover, compared to the system using the high-sensitivity precision flow sensor. It is to provide a device that adjusts a minute flow rate of a chemical liquid that is far cheaper.
【0009】[0009]
上記の目的を達成するために、本考案では、原水の流れる主管の適宜位置にて 、任意流量の薬液を比例混入させる装置において、この主管に主管流量検出手段 と、バイパス流路を設け、このバイパス流路にバイパス流量定流手段と、バイパ ス流路に薬液を混合する混合流量制御手段と、混合流量検出手段を設け、ここで 混合される薬液の流量は、主管流量検出手段の検出結果と、混合流量検出手段の 検出結果を演算する演算手段を設け、この演算結果により混合流量制御手段の制 御を行うことを特徴とする構成とした。 この場合、主管の適宜位置に主管流量検出手段と共に、この主管から分岐し、 この分岐点より下流側で再び主管に合流するバイパス流路を設け、このバイパス 流路には、分岐点に近い方より順に、バイパス流量検出手段、バイパス流量制御 手段、混合流量検出手段が配設され、一方、薬液タンクより導かれた薬液管の適 宜位置には混合流量制御手段を配設すると共に、この混合流量制御手段の流出側 を、上記バイパス流路のバイパス流量制御手段と混合流量検出手段の中間点で、 バイパス流路を流れる原水と混合可能となるように接続し、この主管流量検出手 段の検出結果と、バイパス流量検出手段と、混合流量検出手段の検出結果を適宜 演算する演算手段を設け、この演算結果により混合流量制御手段の制御を行うこ とが好ましく、バイパス流量検出手段、混合流量検出手段、及び主管流量検出手 段はそれぞれ同一部材を用い、また、バイパス流量制御手段、混合流量制御手段 はそれぞれ同一部材を用いることが好ましい。In order to achieve the above object, in the present invention, in a device for proportionally mixing a chemical liquid of an arbitrary flow rate at an appropriate position of the main pipe through which the raw water flows, the main pipe is provided with a main pipe flow rate detecting means and a bypass flow path. a bypass flow rate constant flow means in the bypass passage, and the mixed confluent amount control means for mixing the liquid medicine to bypass flow path is provided with a mixed flow rate detecting means, the flow rate of the chemical to be mixed here, detection of the main flow rate detecting means The configuration is characterized in that a calculation means for calculating the result and the detection result of the mixed flow rate detection means is provided and the mixed flow rate control means is controlled based on this calculation result. In this case, a bypass flow path that branches from this main pipe and joins with the main pipe again downstream of this branch point is provided at an appropriate position on the main pipe together with the main pipe flow rate detection means. In this order, a bypass flow rate detecting means, a bypass flow rate controlling means, and a mixing flow rate detecting means are arranged, while the mixing flow rate controlling means is arranged at an appropriate position of the chemical liquid pipe guided from the chemical liquid tank, and the mixing flow rate controlling means is arranged. The outflow side of the flow rate control means is connected at the midpoint between the bypass flow rate control means and the mixed flow rate detection means of the bypass flow passage so that it can be mixed with the raw water flowing through the bypass flow passage. It is preferable that a detection means, a bypass flow rate detection means, and a calculation means for appropriately calculating the detection result of the mixed flow rate detection means are provided, and the mixed flow rate control means is controlled by the calculation result. Bypass flow rate detecting unit, mixed flow rate detecting means, and main flow sensing hand stage using each same member also the bypass flow rate control means, the mixed flow rate control means is preferably used, respectively identical members.
【0010】[0010]
以上の構成により、本考案は次の作用を行う。 まず主管流量検出手段によって主管流量Fが検出されると共に、主管よりバイ パス流路で導かれた原水のバイパス流量定流手段により、混合流量検出手段に一 定のオフセット値Foが与えられる。そして、このバイパス流路にはオフセット 値Foに任意流量の薬液ΔFが加算され、この結果、混合流量検出手段には、 Fo+ΔF=Fm が検出される。そして、この混合流量検出手段の検出結果Fmと、主管流量検出 手段の検出結果Fとで適宜演算を行い、薬液の流量ΔFを制御することで所望の 稀釈比を得ている。 With the above configuration, the present invention operates as follows. First, the main pipe flow rate F is detected by the main pipe flow rate detecting means, and a constant offset value Fo is given to the mixed flow rate detecting means by the bypass flow rate constant flow means of the raw water introduced from the main pipe by the bypass passage. Then, an arbitrary flow rate of the chemical solution ΔF is added to the offset value Fo in the bypass flow path, and as a result, the mixed flow rate detection means detects Fo + ΔF = Fm. Then, the detection result Fm of the mixed flow rate detection means and the detection result F of the main pipe flow rate detection means are appropriately calculated, and the flow rate ΔF of the chemical liquid is controlled to obtain a desired dilution ratio.
【0011】 つまり、本考案では、混合流量検出手段のダイナミックレンジ内のレスポンス の良好な部分を利用するので、薬液の微小な流量変化をこのダイナミックレンジ 内に置換している。このため、バイパス流量定流手段によってバイパス流路の流 量を少なくとも混合流量検出手段の最小有効感度以上の一定値に保ち、これをオ フセット値Foとして混合流量検出手段に与えている。そして、薬液タンクから 導かれてきた薬液管の流出側管端は、バイパス流量定流手段と混合流量検出手段 の間で混合可能となるように接続しているので、上記のオフセット値Foに薬液 の流量ΔFが加算された混合流量値Fmが、混合流量検出手段の最大有効感度F maxを上限に検出される。この、加算される薬液の流量ΔFは、 0≦ΔF≦(Fmax−Fo) となる。この混合流量検出手段の検出結果Fmと、主管流量検出手段の検出結果 Fを適宜演算して混合流量制御手段を制御することにより微小流量の薬液の調整 を行っている。That is, in the present invention, since the portion of the mixed flow rate detecting means having a good response within the dynamic range is utilized, a minute flow rate change of the chemical liquid is replaced within this dynamic range. For this reason, the constant flow amount of the bypass flow rate means keeps the flow rate of the bypass flow path at least a constant value equal to or higher than the minimum effective sensitivity of the mixed flow rate detection means, and this value is given to the mixed flow rate detection means as the offset value Fo. Further, since the outflow side pipe end of the chemical liquid pipe introduced from the chemical liquid tank is connected so as to be able to mix between the bypass flow rate constant flow means and the mixing flow rate detection means, the chemical liquid has the above offset value Fo. The mixed flow rate value Fm to which the flow rate ΔF of is added is detected with the maximum effective sensitivity F max of the mixed flow rate detection means as the upper limit. The flow rate ΔF of the added chemical liquid is 0 ≦ ΔF ≦ (Fmax-Fo). The detection result Fm of the mixed flow rate detection means and the detection result F of the main pipe flow rate detection means are appropriately calculated and the mixed flow rate control means is controlled to adjust the chemical liquid having a minute flow rate.
【0012】[0012]
図1は本考案の一実施例を示す回路図であり、具体的には以下のように構成さ れている。 まず、ポンプ31に加圧されて送水される原水の流れる主管20の適宜位置に 、この主管20から分岐し、この分岐点より下流側で再び主管20に合流するバ イパス流路21を設けている。このバイパス流路21には、分岐点に近い方より 順に、バイパス流量センサ22、バイパス流量制御バルブ23、混合流量センサ 24が配設され、一方、薬液タンク26より導かれた薬液管27の適宜位置には 混合流量制御バルブ25を配設すると共に、この薬液管27の流出側管端を、上 記バイパス流路21の、バイパス流量制御バルブと混合流量センサ24の中間点 に、バイパス流路21を流れる原水と混合可能となるように接続している。 FIG. 1 is a circuit diagram showing an embodiment of the present invention, which is specifically configured as follows. First, at a suitable position of the main pipe 20 through which the raw water pressurized by the pump 31 is fed, a bypass passage 21 is branched from the main pipe 20 and joined to the main pipe 20 again downstream from the branch point. There is. In this bypass flow passage 21, a bypass flow rate sensor 22, a bypass flow rate control valve 23, and a mixed flow rate sensor 24 are arranged in this order from the side closer to the branch point, while the chemical liquid pipe 27 led from a chemical liquid tank 26 is appropriately arranged. A mixing flow rate control valve 25 is disposed at the position, and the outflow side pipe end of the chemical liquid pipe 27 is provided at the intermediate point between the bypass flow rate control valve and the mixing flow rate sensor 24 in the bypass flow channel 21 described above. It is connected so that it can be mixed with the raw water flowing through 21.
【0013】 また、主管20の、上記バイパス流路21の合流点よりも下流側に第二バイパ ス路29を配設し、これに主管流量センサ30を設け、また、主管20のバイパ ス流路21の分岐点と合流点の中間位置に逆止弁32を設けている。そして、主 管流量センサ30と、バイパス流量センサ23と、混合流量センサ24の各検出 出力はコントローラ28に接続され、このコントローラの制御出力はバイパス流 量制御バルブ23、混合流量制御バルブ25に接続される。Further, a second bypass passage 29 is provided on the downstream side of the confluence point of the bypass passage 21 of the main pipe 20, a main pipe flow sensor 30 is provided there, and a bypass flow of the main pipe 20 is provided. A check valve 32 is provided at an intermediate position between the junction and the branch point of the passage 21. The detection outputs of the main pipe flow rate sensor 30, the bypass flow rate sensor 23, and the mixed flow rate sensor 24 are connected to the controller 28, and the control output of this controller is connected to the bypass flow rate control valve 23 and the mixed flow rate control valve 25. To be done.
【0014】 次に、本実施例における作用の説明を行う。 本考案では、前述したように、混合流量センサ24のダイナミックレンジ内の レスポンスの良好な部分、例えば35cc〜1000ccの範囲を利用するので 、液体肥料の微小な流量変化ΔFをこのダイナミックレンジ内で変化するように 置換している。このため、バイパス流量センサ22の検出出力でバイパス流量バ ルブ23を制御することで、バイパス流路21の流量を少なくとも混合流量セン サ24の最小有効感度以上、つまり35cc/毎分以上の一定値に保ち、これを オフセット流量値Foとして混合流量センサ24に流している。Next, the operation of this embodiment will be described. In the present invention, as described above, since the portion of the mixed flow rate sensor 24 having a good response within the dynamic range, for example, the range of 35 cc to 1000 cc is used, the minute flow rate change ΔF of the liquid fertilizer is changed within this dynamic range. It is replaced so that Therefore, by controlling the bypass flow valve 23 with the detection output of the bypass flow sensor 22, the flow rate of the bypass flow passage 21 is at least a minimum effective sensitivity of the mixed flow sensor 24, that is, a constant value of 35 cc / min or more. Is maintained and the offset flow rate value Fo is supplied to the mixed flow rate sensor 24.
【0015】 そして、薬液タンク26から導かれてきた、混合流量制御バルブ25を有する 薬液管27の流出側管端は、バイパス流量バルブ23と混合流量センサ24の間 で混合可能となるように接続しているので、上記のオフセット値Foに薬液の流 量ΔFが加算された混合値Fmが、混合流量センサ24の最大有効感度Fmax 、本実施例では1000cc/毎分を上限に検出される。この、加算される液体 肥料の流量ΔFは、 0≦ΔF≦(Fmax−Fo) であるから、本例における具体値で示すと、 0≦ΔF≦(1000−35) ∴ΔF=0cc/毎分〜965cc/毎分 となる。The outflow side pipe end of the chemical liquid pipe 27 having the mixing flow rate control valve 25, which is guided from the chemical liquid tank 26, is connected between the bypass flow valve 23 and the mixing flow sensor 24 so that mixing can be performed. Therefore, the mixed value Fm obtained by adding the flow rate ΔF of the chemical liquid to the offset value Fo is detected with the upper limit of the maximum effective sensitivity Fmax of the mixed flow sensor 24, which is 1000 cc / min in this embodiment. Since the flow rate ΔF of the liquid fertilizer to be added is 0 ≦ ΔF ≦ (Fmax-Fo), the specific value in this example is as follows: 0 ≦ ΔF ≦ (1000-35) ∴ΔF = 0 cc / min ~ 965 cc / min.
【0016】 ここで得られた検出結果はコントローラ28に送られ、この混合流量センサ2 4の出力Fm=Fo+ΔFと、主管流量センサ30の出力Fによって指示倍率F rを演算する。この演算は次のように行われ、 Fr=(Fm−Fo)/F ∴Fr=ΔF/F 予め定められた指示倍率を一定に保つように、混合流量バルブ25を制御してい る。例えば、指示倍率が1/20000で、主管流量Fが100000cc/毎 分で、オフセット値Foが50cc/毎分の場合、コントローラ28は上記演算 式にしたがって、液体肥料の流量ΔFが5cc/毎分になるように混合流量制限 バルブ25を制御する。The detection result obtained here is sent to the controller 28, and the indicated magnification F r is calculated by the output Fm = Fo + ΔF of the mixed flow rate sensor 24 and the output F of the main pipe flow rate sensor 30. This calculation is performed as follows: Fr = (Fm-Fo) / F∴Fr = ΔF / F The mixed flow rate valve 25 is controlled so as to keep a predetermined designated magnification constant. For example, when the designated magnification is 1/20000, the main pipe flow rate F is 100,000 cc / min, and the offset value Fo is 50 cc / min, the controller 28 calculates the liquid fertilizer flow rate ΔF by 5 cc / min according to the above equation. The mixed flow rate limiting valve 25 is controlled so that
【0017】 本実施例ではこれらのコストを極力抑えるために、上記した各センサ22、2 4、及び30は同一部品としている。このため本実施例では、主管流量をこのよ うなセンサ、つまり35cc〜1000cc/毎分しか検出できないセンサで大 容量の検出できるように、主管20に設けた第二バイパス流路29で原水を分流 させている。また、主管20の逆止弁32は、ポンプ31の停止時における原水 の逆流を防いでいる。In the present embodiment, in order to suppress these costs as much as possible, the above-mentioned sensors 22, 24, and 30 are the same parts. For this reason, in the present embodiment, the raw water is diverted in the second bypass flow passage 29 provided in the main pipe 20 so that the main pipe flow rate can be detected by such a sensor, that is, a sensor capable of detecting only 35 cc to 1000 cc / min. I am letting you. Further, the check valve 32 of the main pipe 20 prevents the reverse flow of raw water when the pump 31 is stopped.
【0018】 ここで用いた各流量センサ22、24、及び30は上述したように、従来より 用いられている安価な回転式センサを用い、各流量制御バルブ23、及び25は 、電動アクチュエータを搭載した合成樹脂性ボール弁を用い、コントローラ28 は精密な制御が比較的簡単、且つ安価に行える8bitCPUで構成されたもの を用いている。しかし、このような部材はここで用いた物だけに限定されること なく様々なものを用いて実施することができる。 例えば、各流量センサ22、24、及び30には他型式のものを用い、各流量 制御バルブ23、及び25には電動、或は流体アクチュエータ搭載型のバタフラ イバルブを用い、コントローラ28にはアナログ式のフィードバックコントロー ラを用いる等してもよい。従って、実施の際には適宜選択により、様々な態様で 構成することが可能である。As described above, each of the flow rate sensors 22, 24, and 30 used here is an inexpensive rotary sensor that has been conventionally used, and each of the flow rate control valves 23 and 25 is equipped with an electric actuator. The above-mentioned synthetic resin ball valve is used, and the controller 28 is composed of an 8-bit CPU that can perform precise control relatively easily and at low cost. However, such members are not limited to those used here, and various members can be used. For example, other types are used for the flow rate sensors 22, 24, and 30, but electric or fluid-actuator-mounted butterfly valves are used for the flow rate control valves 23 and 25, and an analog type is used for the controller 28. You may use the feedback controller of. Therefore, it can be configured in various modes by appropriately selecting it at the time of implementation.
【0019】[0019]
以上の説明で明らかな通り、本考案は以下に挙げるような数々の優れた効果を 有するものである。 つまり、従来から用いられてきた、廉価な一般普及型の流量センサをそのまま 利用しているので、システム全体としての製品価格が高価格であったという従来 の課題を効果的に解決している。しかも、本考案は、簡単な構成であるにも係ら ず、高価な高感度精密センサを用いた場合と同様に、微小流量調整を高精度で実 現していると共に、簡単な構成と耐食性部材の採用が相俟って、故障の心配は皆 無である。 また、構成部材の共通化を図ることによって、製品価格のさらなるコストダウ ンをもたらすと共に、システムの保守管理の負担を大幅に軽減できるようになっ た。つまり、このような構成は、農業事業者にとっての生産設備に関する経済的 負担を大幅に軽減することが可能となり、結果的には一般消費者の利益にもつな がる等の効果を有している。 As is clear from the above description, the present invention has various excellent effects as described below. In other words, the low-priced general-purpose type flow sensor that has been used in the past is used as it is, so the conventional problem that the product price of the entire system is high is effectively solved. Moreover, the present invention realizes a minute flow rate adjustment with high accuracy as well as the case of using an expensive high-sensitivity precision sensor, although it has a simple structure, and has a simple structure and a corrosion-resistant member. Thanks to the adoption, there is no fear of failure. In addition, by sharing the components, it is possible to further reduce the product price and significantly reduce the system maintenance burden. In other words, such a structure can significantly reduce the economic burden on the production equipment for the agricultural business, and as a result, have the effect of contributing to the interests of general consumers. There is.
【図1】本考案の一実施例を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of the present invention.
【図2】従来例を示す回路図である。FIG. 2 is a circuit diagram showing a conventional example.
【図3】従来例における回転式流量センサの構造を示す
略図である。FIG. 3 is a schematic diagram showing the structure of a rotary flow sensor in a conventional example.
20 主管 21 バイパス流路 22 バイパス流量センサ 23 バイパス流量制限バルブ 24 混合流量センサ 25 混合流量制限バルブ 28 コントローラ 30 主管流量センサ 20 Main Pipe 21 Bypass Flow Path 22 Bypass Flow Rate Sensor 23 Bypass Flow Rate Limiting Valve 24 Mixing Flow Rate Sensor 25 Mixing Flow Rate Limiting Valve 28 Controller 30 Main Pipe Flow Rate Sensor
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 G05D 11/02 7001−3H ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display location G05D 11/02 7001-3H
Claims (3)
流量の薬液を比例混入させる装置において、この主管に
主管流量検出手段と、バイパス流路を設け、このバイパ
ス流路にバイパス流量定流手段と、バイパス流路に薬液
を混合する混合流量制御手段と、混合流量検出手段を設
け、ここで混合される薬液の流量は、主管流量検出手段
の検出結果と、混合流量検出手段の検出結果を演算する
演算手段を設け、この演算結果により混合流量制御手段
の制御を行うことを特徴とする薬液の微小流量調整装
置。1. A device for proportionally mixing a chemical solution at an arbitrary flow rate at an appropriate position of a main pipe through which raw water flows, in which a main pipe flow rate detection means and a bypass flow passage are provided, and a bypass flow constant flow is provided in this bypass flow passage. means, confused merging amount control means for mixing the liquid medicine to bypass flow path, a mixture flow rate detection means is provided, the flow rate of the chemical liquid to be mixed here is a detection result of the main flow rate detecting means, the detection of the mixed flow rate detecting means A minute flow rate adjusting device for a chemical liquid, characterized in that a calculation means for calculating a result is provided and the mixed flow rate control means is controlled by the calculation result.
に、この主管から分岐し、この分岐点より下流側で再び
主管に合流するバイパス流路を設け、このバイパス流路
には、分岐点に近い方より順に、バイパス流量検出手
段、バイパス流量制御手段、混合流量検出手段が配設さ
れ、一方、薬液タンクより導かれた薬液管の適宜位置に
は混合流量制御手段を配設すると共に、この混合流量制
御手段の流出側を、上記バイパス流路のバイパス流量制
御手段と混合流量検出手段の中間点で、バイパス流路を
流れる原水と混合可能となるように接続し、この主管流
量検出手段の検出結果と、バイパス流量検出手段と、混
合流量検出手段の検出結果を適宜演算する演算手段を設
け、この演算結果により混合流量制御手段の制御を行う
ことを特徴とする請求項1に記載の薬液の微小流量調整
装置。2. A bypass flow path is provided at an appropriate position of the main pipe together with the main pipe flow rate detection means, and a bypass flow path that branches from this main pipe and joins the main pipe again downstream from this branch point is provided at this branch flow path. The bypass flow rate detecting means, the bypass flow rate controlling means, and the mixed flow rate detecting means are arranged in order from the closer one, while the mixing flow rate controlling means is arranged at an appropriate position of the chemical liquid pipe led from the chemical liquid tank. The outflow side of the mixed flow rate control means is connected at an intermediate point between the bypass flow rate control means and the mixed flow rate detection means of the bypass flow passage so that it can be mixed with the raw water flowing through the bypass flow passage, It is characterized in that a detection means, a bypass flow rate detection means, and a calculation means for appropriately calculating the detection result of the mixed flow rate detection means are provided, and the mixed flow rate control means is controlled by this calculation result. Item 2. A minute flow rate adjusting device for a chemical solution according to Item 1.
段、及び主管流量検出手段はそれぞれ同一部材を用い、
また、バイパス流量制御手段、混合流量制御手段はそれ
ぞれ同一部材を用いたことを特徴とする請求項1または
2に記載の薬液の微小流量調整装置。3. The bypass flow rate detecting means, the mixed flow rate detecting means, and the main pipe flow rate detecting means use the same member, respectively.
Further, the bypass flow rate control means and the mixed flow rate control means use the same member respectively, and the minute flow rate adjusting device for chemical liquid according to claim 1 or 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1991113361U JP2556232Y2 (en) | 1991-12-27 | 1991-12-27 | Fine flow rate adjustment device for chemicals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1991113361U JP2556232Y2 (en) | 1991-12-27 | 1991-12-27 | Fine flow rate adjustment device for chemicals |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0553455U true JPH0553455U (en) | 1993-07-20 |
JP2556232Y2 JP2556232Y2 (en) | 1997-12-03 |
Family
ID=14610337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1991113361U Expired - Lifetime JP2556232Y2 (en) | 1991-12-27 | 1991-12-27 | Fine flow rate adjustment device for chemicals |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2556232Y2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018176113A1 (en) * | 2017-03-27 | 2018-10-04 | Pozzani Enison Roberto | Device applied to equipment with an electric diaphragm metering pump for controlling the injection of fertilizers into irrigation systems |
KR20220046047A (en) * | 2020-10-06 | 2022-04-14 | 경상국립대학교산학협력단 | Control device for nutrient solution irrigation |
-
1991
- 1991-12-27 JP JP1991113361U patent/JP2556232Y2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018176113A1 (en) * | 2017-03-27 | 2018-10-04 | Pozzani Enison Roberto | Device applied to equipment with an electric diaphragm metering pump for controlling the injection of fertilizers into irrigation systems |
KR20220046047A (en) * | 2020-10-06 | 2022-04-14 | 경상국립대학교산학협력단 | Control device for nutrient solution irrigation |
Also Published As
Publication number | Publication date |
---|---|
JP2556232Y2 (en) | 1997-12-03 |
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