JPH0114604B2 - - Google Patents
Info
- Publication number
- JPH0114604B2 JPH0114604B2 JP55143416A JP14341680A JPH0114604B2 JP H0114604 B2 JPH0114604 B2 JP H0114604B2 JP 55143416 A JP55143416 A JP 55143416A JP 14341680 A JP14341680 A JP 14341680A JP H0114604 B2 JPH0114604 B2 JP H0114604B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- relay tank
- control valve
- control
- flow rate
- 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
- 239000007788 liquid Substances 0.000 claims description 33
- 230000007423 decrease Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Flow Control (AREA)
- Control Of Non-Electrical Variables (AREA)
Description
【発明の詳細な説明】
本発明はフイルタープレスなどに供給する流体
の制御を、開閉方向が互に逆動作する2つの調節
弁により行うようにした流量調節装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow rate regulating device in which fluid supplied to a filter press or the like is controlled by two regulating valves whose opening and closing directions operate in opposite directions.
一般にフイルタープレスに対する処理液の供給
は、プレス容量などに応じて所定量に制御する必
要があるが、給液時間に応じて布の抵抗が次第
に大きくなり、これに伴つて流量が変化するた
め、実際の流量や中継槽の流面レベルを測定しな
がら流量調節弁の弁開度を増減させ、所定流量を
得るようにしている。 Generally, the supply of processing liquid to a filter press needs to be controlled at a predetermined amount depending on the press capacity, etc., but the resistance of the cloth gradually increases depending on the liquid supply time, and the flow rate changes accordingly. While measuring the actual flow rate and the flow surface level of the relay tank, the opening degree of the flow rate control valve is increased or decreased to obtain a predetermined flow rate.
この状態を示したのが第1図であつて、中継槽
1に定量的に供給された処理液は、ポンプ2によ
り配管3,4,5を経てフイルタープレス6に送
液される。配管4と5の間に流量調節弁7を設
け、中継槽1の液面レベルを検出する液面検出器
8の出力にもとづき制御装置9を介してこの調節
弁7の開度を自動的に増減し、常時流入量に等し
い流体をフイルタープレス6に供給するのであ
る。 This state is shown in FIG. 1, in which the treatment liquid quantitatively supplied to the relay tank 1 is sent to the filter press 6 via the pipes 3, 4, and 5 by the pump 2. A flow control valve 7 is provided between the pipes 4 and 5, and the opening degree of the control valve 7 is automatically adjusted via a control device 9 based on the output of a liquid level detector 8 that detects the liquid level in the relay tank 1. It increases and decreases, and constantly supplies fluid equal to the inflow amount to the filter press 6.
つまり、フイルタープレス6の目詰りにより給
液が流れにくくなると、中継槽1の液面レベルが
設定値よりも上昇するので、これを検知して調節
弁7の開度を増大し、流量を増やすのである。 In other words, if the supplied liquid becomes difficult to flow due to clogging of the filter press 6, the liquid level in the relay tank 1 will rise above the set value, and this will be detected and the opening degree of the control valve 7 will be increased to increase the flow rate. It is.
このようにしてフイルタープレス6への供給流
量を常に中継槽1の流入量と等しく保つのである
が、実際には、フイルタープレス6への給液時間
に略比例して布に沈殿物が付着し、その圧力損
失が例えば0.5〜4.0Kg/cm2と大巾に変動するた
め、流量の調節弁7としてはかなり大きな容量が
要求され、しかも良く知られているように弁開度
の大きい領域では、単位弁開度に対する流量変化
巾が相対的に大きくなるため(オン・オフ的な制
御特性に近くなる)、とくにフイルタープレス6
の圧力損失の大きいときは正確な流量制御が困
難、即ち制御範囲が限定され、中継槽1の液面レ
ベルも大きく変動し、中継槽1から処理液が溢れ
たりポンプ2の吸込不足によりポンプ2が損傷す
る等の問題があつて、円滑な操業が不可能となる
こともあつた。 In this way, the flow rate supplied to the filter press 6 is always kept equal to the flow rate into the relay tank 1, but in reality, sediment adheres to the cloth approximately in proportion to the time of liquid supply to the filter press 6. Since the pressure loss fluctuates widely, for example from 0.5 to 4.0 Kg/cm 2 , a considerably large capacity is required for the flow rate control valve 7, and as is well known, in the region where the valve opening is large, , since the range of flow rate change with respect to the unit valve opening becomes relatively large (close to on/off control characteristics), especially for filter press 6.
When there is a large pressure loss in There were also problems such as damage to equipment, making smooth operations impossible.
本発明はこのような問題を解決するものであつ
て、ポンプからの給液の一部をリターンさせ、こ
のリターン量とメイン配管への送液量とを2つの
可逆的に作動する調節弁で制御することにより、
圧力変動にもかかわらず精度よい定量制御が得ら
れる流量調節装置を提供することを目的とする。 The present invention solves this problem by returning a portion of the liquid supplied from the pump and adjusting the amount of this return and the amount of liquid sent to the main piping using two reversibly operated control valves. By controlling
It is an object of the present invention to provide a flow rate adjustment device that can provide accurate quantitative control despite pressure fluctuations.
以下、本発明の実施例を第2図にもとづいて説
明するが、図中、第1図と同一部分については同
符号を用いることにする。 Hereinafter, an embodiment of the present invention will be described based on FIG. 2, in which the same parts as in FIG. 1 are denoted by the same reference numerals.
フイルタープレス6へ中継槽1からの処理液を
供給するメイン配管4と5の間には処理流量を調
節する調節弁7Aが設けられており、該調節弁7
Aの手前の地点から、分岐管10を分岐させる。 A control valve 7A is provided between the main pipes 4 and 5 for supplying the processing liquid from the relay tank 1 to the filter press 6 to adjust the processing flow rate.
A branch pipe 10 is branched from a point in front of A.
分岐管10は中継槽1へメイン配管4からの送
液の一部をリターンさせるもので、このリターン
量を制御する調節弁7Bがその途中に設けてあ
る。 The branch pipe 10 returns a part of the liquid sent from the main pipe 4 to the relay tank 1, and a control valve 7B for controlling the amount of return is provided in the middle thereof.
これら調節弁7Aと7Bは制御装置9からの信
号により、弁開度が互に逆の関係で動作しながら
常に液面レベルが一定となるようにフイードバツ
ク制御される。 These control valves 7A and 7B are feedback-controlled by signals from the control device 9 so that the liquid level is always constant while the valve opening degrees operate in an opposite relationship.
つまり、中継槽1の液面レベルが設定値よりも
高くなれば、メイン配管4の調節弁7Aの開度を
すと同時に分岐管10の調節弁7Bの開度を減ら
すのである。 In other words, when the liquid level in the relay tank 1 becomes higher than the set value, the opening degree of the control valve 7A of the main pipe 4 is decreased and at the same time the opening degree of the control valve 7B of the branch pipe 10 is decreased.
尚調節弁7A,7Bは電気制御方式でも空気制
御方式でも用いることができる。 Note that the control valves 7A and 7B can be used with either an electrical control method or a pneumatic control method.
次に全体的な作用を説明する。 Next, the overall effect will be explained.
中継槽1には外部から処理液が連続して定量的
に流入し、この流入量と同一量がフイルタープレ
ス6へと供給される。 A processing liquid flows continuously and quantitatively into the relay tank 1 from the outside, and the same amount as this inflow is supplied to the filter press 6.
このために、液面検出器8が中継槽1の液面レ
ベルを検出し、これにもとづいて制御装置9から
の信号で調節弁7Aと7Bの開度が制御され、ポ
ンプ2が汲み出した処理液をメイン配管4,5か
らフイルタープレス6へ給送するとともに、その
一部を分岐管10を経て中継槽1に戻している。 For this purpose, the liquid level detector 8 detects the liquid level in the relay tank 1, and based on this, the opening degrees of the control valves 7A and 7B are controlled by a signal from the control device 9, and the pump 2 pumps out the liquid. The liquid is fed from the main pipes 4 and 5 to the filter press 6, and part of it is returned to the relay tank 1 via a branch pipe 10.
この状態で次第にフイルタープレス6の布に
ケーキが付着して圧力損失が増大すると、これに
伴いメイン配管5への流量が減り、同時にポンプ
吐出圧力が高まつて分岐管10へのリターン流量
が増えるため、中継槽1の液面レベルは上昇す
る。 In this state, as cake gradually adheres to the cloth of the filter press 6 and pressure loss increases, the flow rate to the main pipe 5 decreases, and at the same time, the pump discharge pressure increases and the return flow rate to the branch pipe 10 increases. Therefore, the liquid level in the relay tank 1 rises.
しかし、この液面レベルの上昇を液面検出器8
が検出して、制御装置9によりメイン側の調節弁
7Aの開度を増すとともにリターン側の調節弁7
Bの開度を減らすため液面レベルは一定に保たれ
る。これによりフイルタープレス6への送液量の
低下が圧力損失の増加にもかかわらず防止できる
のである。しかもこの制御はメイン側への送液抵
抗を減らすと同時にリターン側の抵抗を増やすの
で、とくにフイルタープレス6での圧力損失が非
常に大きいとき(洗浄工程に近いとき)でも、調
節弁7A,7Bの開度をそれほど大きく変化させ
る必要がなく、したがつて制御精度としては極め
て良好でかつ迅速な応答性が得られる。 However, this rise in the liquid level can be detected by the liquid level detector 8.
is detected, the control device 9 increases the opening degree of the main side control valve 7A, and also increases the opening degree of the return side control valve 7A.
By reducing the opening degree of B, the liquid level is kept constant. Thereby, a decrease in the amount of liquid fed to the filter press 6 can be prevented despite an increase in pressure loss. Furthermore, this control reduces the liquid feeding resistance to the main side and at the same time increases the resistance on the return side, so even when the pressure loss in the filter press 6 is extremely large (close to the cleaning process), the control valves 7A and 7B It is not necessary to change the opening degree so much, and therefore extremely good control accuracy and quick response can be obtained.
換言すると、第1図の装置ではかなり大容量の
流量調節弁を大開度域で使用するために生じてい
た制御のハンチング現象を、本発明では確実に防
止できるのである。 In other words, the present invention can reliably prevent the control hunting phenomenon that occurs in the apparatus shown in FIG. 1 because a fairly large-capacity flow control valve is used in a large opening range.
以上の説明では中継槽1に対して単一のフイル
タープレス6を接続している例を示したが、複数
のフイルタープレス6を並列に接続し、個々の所
要操業時間に対応してセツトしたタイマにより、
順次切替えて処理液を供給することもできる。 In the above explanation, an example is shown in which a single filter press 6 is connected to the relay tank 1, but it is also possible to connect a plurality of filter presses 6 in parallel and set a timer corresponding to the required operation time of each. According to
It is also possible to supply the processing liquid by switching sequentially.
以上のように本発明は、メイン側とリターン側
とにそれぞれ調節弁を設け、中継槽の液面レベル
が一定となるように両調節弁を互に逆動作させる
ようにしたので、供給圧力の変動にもかかわらず
極めて高精度で応答性のすぐれた定流量制御が行
える。 As described above, in the present invention, control valves are provided on the main side and the return side, and both control valves are operated in opposite directions so that the liquid level in the relay tank remains constant. Constant flow control with extremely high accuracy and excellent responsiveness is possible despite fluctuations.
第1図は従来装置の配管図、第2図は本発明の
実施例の配管図である。
1…中継槽、2…ポンプ、3,4,5…メイン
配管、6…フイルタープレス、7A,7B…調節
弁、8…液面検出器、10…分岐管。
FIG. 1 is a piping diagram of a conventional device, and FIG. 2 is a piping diagram of an embodiment of the present invention. 1... Relay tank, 2... Pump, 3, 4, 5... Main piping, 6... Filter press, 7A, 7B... Control valve, 8... Liquid level detector, 10... Branch pipe.
Claims (1)
ら液体を需要部へ送り込むメイン配管の途中に第
1の調節弁を設け、この調節弁の手前から前記中
継槽へと液体の一部を還流する分岐管に第2の調
節弁を設ける一方、前記中継槽の液面レベルを検
知する検出器を設け、この検出器によつて測定さ
れる液面レベルが一定となるように前記両調節弁
の開度をフイードバツク制御するようにしたこと
を特徴とする流量調節装置。1. A first control valve is provided in the middle of the main piping that sends liquid to the demand part from a relay tank that is continuously supplied with liquid from the outside, and a part of the liquid is returned to the relay tank from before this control valve. A second control valve is provided in the branch pipe, and a detector is provided to detect the liquid level in the relay tank, and both control valves are arranged so that the liquid level measured by the detector is constant. 1. A flow rate adjustment device characterized in that the opening degree of the flow control device is controlled by feedback.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14341680A JPS5769320A (en) | 1980-10-14 | 1980-10-14 | Flow rate controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14341680A JPS5769320A (en) | 1980-10-14 | 1980-10-14 | Flow rate controller |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5769320A JPS5769320A (en) | 1982-04-28 |
JPH0114604B2 true JPH0114604B2 (en) | 1989-03-13 |
Family
ID=15338249
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14341680A Granted JPS5769320A (en) | 1980-10-14 | 1980-10-14 | Flow rate controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5769320A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58190715U (en) * | 1982-06-14 | 1983-12-19 | 住友金属鉱山株式会社 | Liquid level control device |
JPS6281109U (en) * | 1985-11-05 | 1987-05-23 | ||
JP2016160768A (en) * | 2015-02-26 | 2016-09-05 | 株式会社クボタ | Pump system, pump system operation method and pump system modification method |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5143366A (en) * | 1974-10-10 | 1976-04-14 | Mitsubishi Heavy Ind Ltd | INAATOGASUKYOKYUSETSUBI |
-
1980
- 1980-10-14 JP JP14341680A patent/JPS5769320A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5143366A (en) * | 1974-10-10 | 1976-04-14 | Mitsubishi Heavy Ind Ltd | INAATOGASUKYOKYUSETSUBI |
Also Published As
Publication number | Publication date |
---|---|
JPS5769320A (en) | 1982-04-28 |
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