JPS6241052B2 - - Google Patents
Info
- Publication number
- JPS6241052B2 JPS6241052B2 JP55088825A JP8882580A JPS6241052B2 JP S6241052 B2 JPS6241052 B2 JP S6241052B2 JP 55088825 A JP55088825 A JP 55088825A JP 8882580 A JP8882580 A JP 8882580A JP S6241052 B2 JPS6241052 B2 JP S6241052B2
- Authority
- JP
- Japan
- Prior art keywords
- cleaning
- floor
- turbidity
- detecting
- rapid
- 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
- 238000004140 cleaning Methods 0.000 claims description 100
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000002351 wastewater Substances 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 230000004069 differentiation Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 6
- 238000000746 purification Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Filtration Of Liquid (AREA)
Description
【発明の詳細な説明】
本発明は急速過池の自動洗浄運転の制御を行
なう急速過池の自動洗浄制御装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic cleaning control device for a rapid overflow basin that controls automatic cleaning operation of a rapid overflow basin.
従来、急速過池の洗浄の制御は、その開始時
期は床の閉塞による損失水頭を検出し、その値
があらかじめ設定された値となつた時とし、また
その終了時期は洗浄が開始されてから予め決めら
れた時間経過時であり、その決められた時間だけ
洗浄運転した後、終了させている。 Conventionally, rapid overflow basin cleaning control starts when the head loss due to bed blockage is detected and reaches a preset value, and ends after the cleaning has started. This is when a predetermined time has elapsed, and after the cleaning operation has been performed for the predetermined time, it is terminated.
すなわち、洗浄運転開始時期はプロセスの状態
（床の目詰り）により行なつているが、洗浄終
了は単にタイマ等を用いた時間制御による方式を
用いており、プロセスの状態（洗浄が目標どおり
行なわれたか否か）により行なわれるものではな
いので、時として洗浄の過不足を生じる。 In other words, the timing to start cleaning operation is determined by the process condition (clogging of the floor), but the cleaning end is simply time-controlled using a timer, etc. Since cleaning is not carried out depending on whether the cleaning was done properly or not, over- or under-cleaning may sometimes occur.
一方、最近のように浄水場の大規模化に伴な
い、池数が多くなり過池群としての維持管理が
要望されるようになると、各々の過池の洗浄運
転を合理化する必要が生じて来る。 On the other hand, as water treatment plants have become larger in size in recent years, the number of ponds has increased and maintenance management as a group of ponds has become necessary, and it has become necessary to streamline the cleaning operation of each pond. come.
すなわち、過池群としては本来の過運転を
行ないつつ、群のうちのいくつかの過池は洗浄
を行ないながら、全体としては、連続の過運転
を行なう群制御が望まれるところであるが、上述
のようにタイマによる時間制御では洗浄効果に過
不足が生じて効果的な群制御は望めない。 In other words, it is desired to perform group control in which the over-reservoir group performs its original over-operation, while some of the over-reservoirs in the group are cleaned, and the group as a whole is continuously over-operated. As shown in Fig. 1, time control using a timer results in insufficient or excessive cleaning effects, and effective group control cannot be expected.
本発明は上記事情に鑑みて成されたもので、従
来技術の欠点を除去すべくその洗浄運転の洗浄効
果を検出するために洗浄排水の濁度を測定し、こ
の検出値の変化をもつて洗浄効果を見極め洗浄運
転の終了を行なわせるようにした急速過池の洗
浄運転の自動開始、終了制御を行なう急速過池
の自動洗浄制御装置を提供することを目的とす
る。 The present invention has been made in view of the above circumstances, and in order to eliminate the drawbacks of the conventional technology, the turbidity of cleaning waste water is measured in order to detect the cleaning effect of the cleaning operation, and the turbidity of the cleaning wastewater is measured based on the change in this detected value. It is an object of the present invention to provide an automatic cleaning control device for a rapid overflow basin that controls the automatic start and end of a cleaning operation on a rapid overflow basin by ascertaining the cleaning effect and terminating the cleaning operation.
以下、本発明の一実施例について図面を参照し
ながら説明する。急速過池の洗浄運転を過運
転の中に織り込んで行なう場合、洗浄開始は、従
来通り過損失水頭がある設定値に達した時に、
また、洗浄終了は、洗浄排水濁度が設定値以下と
なつた時に行なうことが本発明の特徴である。 An embodiment of the present invention will be described below with reference to the drawings. When the rapid overflow pond cleaning operation is incorporated into the overoperation, cleaning starts when the overloss head reaches a certain set value, as in the past.
Further, a feature of the present invention is that the cleaning is completed when the turbidity of the cleaning waste water becomes below a set value.
以下、本発明の１実施例を第１図を参照して説
明する。図において１は急速過池であり、２は
床である。過済液は床２の下部より取り出
し浄水弁３を介して外部へ導く。４は急速過池
１の下部に溜つた過済液等を排出するための排
出弁である。急速過池１にはその側部に床２
上部より溢れる液体を貯留するための溢水槽１ａ
が設けてあり、この溢水槽１ａは貯留液の導出制
御のための排水弁５及び逆止弁６を介して導出管
７に接続されている。急速過池１の洗浄効果を
測定するために、排水弁５と、その先の逆止弁６
との間に濁度計８が設置され、その濁度計８から
の信号より濁度の変化を検出する微分演算器９
と、この微分演算器９の出力信号を受けこの出力
信号の変化率が負の時のみ当該出力信号を出力す
るリミツタ１０を設けると共にその出力を後述す
る比較器１１に入力する構成とする。また洗浄効
果を必要十分な洗浄排水濁度に見い出し、その値
を設定するための設定器１２を設け、この設定器
１２の設定値と前記濁度計８からの信号を比較し
て、設定値以下、且つ前記リミツタ１０の出力が
有るときのみ信号を出力する比較器１１を設け、
その出力を洗浄の際に各弁の開閉や洗浄水送出を
行なう洗浄水ポンプ１３等の制御を行なう洗浄制
御シーケンス装置１４に入力する。 Hereinafter, one embodiment of the present invention will be described with reference to FIG. In the figure, 1 is a rapid overflow pond, and 2 is a bed. The waste liquid is taken out from the bottom of the bed 2 and guided to the outside via the water purification valve 3. Reference numeral 4 designates a discharge valve for discharging the liquid and the like accumulated in the lower part of the rapid drainage basin 1. Rapid passing pond 1 has floor 2 on its side.
Overflow tank 1a for storing liquid overflowing from the top
This overflow tank 1a is connected to a discharge pipe 7 via a drain valve 5 and a check valve 6 for controlling discharge of the stored liquid. In order to measure the cleaning effect of the rapid overflow basin 1, a drain valve 5 and a check valve 6 beyond it are installed.
A turbidity meter 8 is installed between the turbidity meter 8 and a differential calculator 9 that detects a change in turbidity from the signal from the turbidity meter 8.
A limiter 10 is provided which receives the output signal of the differential calculator 9 and outputs the output signal only when the rate of change of the output signal is negative, and its output is input to a comparator 11 to be described later. In addition, a setting device 12 is provided to find the cleaning effect in a necessary and sufficient cleaning wastewater turbidity and set the value.The setting value of this setting device 12 is compared with the signal from the turbidity meter 8, and the setting value Below, a comparator 11 is provided which outputs a signal only when there is an output from the limiter 10,
The output is input to a cleaning control sequence device 14 that controls the cleaning water pump 13, etc., which opens and closes each valve and sends out cleaning water during cleaning.
一方、洗浄の自動開始のためには、従来方法と
同様に床２の上下の圧力差の検出のための差圧
伝送器１５を設置し、さらに洗浄を開始すべき
過損失水頭の設定を行なう設定器１６を設け、ま
たこの設定器１６の設定値と前記差力伝送器１５
からの出力値を比較し、設定値以下になれば洗浄
開始信号を出力する比較器１７を設置する。そし
てこの比較器１７の出力を前記洗浄制御シーケン
ス装置１４に洗浄開始の制御指令として入力する
構成とする。洗浄制御シーケンス装置１４は、特
に目新しいものではないためここでは詳細な説明
は省略するが、この洗浄制御シーケンス装置１４
により浄水弁３、捨水弁４、排水弁５、洗浄弁１
８へ開、閉信号を、また、洗浄水ポンプ１３へ起
動・停止指令をそれぞれ与えるものである。尚、
洗浄弁１８は前記洗浄水ポンプ１３の送水を制御
するための弁でありこの弁１８を介して洗浄水が
床２の下部よりその上方に向けて送水され床
２の洗浄が成される。 On the other hand, in order to automatically start cleaning, a differential pressure transmitter 15 is installed to detect the pressure difference between the upper and lower sides of the floor 2, as in the conventional method, and an excess head loss at which cleaning should be started is set. A setting device 16 is provided, and the setting value of this setting device 16 and the differential force transmitter 15 are
A comparator 17 is installed, which compares the output values from the two and outputs a cleaning start signal if the output value is less than a set value. The output of the comparator 17 is input to the cleaning control sequence device 14 as a control command to start cleaning. The cleaning control sequence device 14 is not particularly new, so a detailed explanation will be omitted here; however, the cleaning control sequence device 14
Water purification valve 3, waste water valve 4, drain valve 5, cleaning valve 1
8 and a start/stop command to the wash water pump 13, respectively. still,
The cleaning valve 18 is a valve for controlling the water supply of the cleaning water pump 13, and through this valve 18, cleaning water is supplied from the lower part of the floor 2 upwardly, thereby cleaning the floor 2.
次に上記構成の装置の動作について説明する。
急速過池１の本来の過運転中に床の目詰り
が進行し、差圧伝送器１５からの信号があらかじ
め設定器１６により設定された過損失水頭値以
下になると比較器１７は洗浄制御シーケンス装置
１４に洗浄開始信号を与える。これにより洗浄制
御シーケンス装置１４は動作して洗浄運転制御を
行ない、浄水弁３、捨水弁４、排水弁５、洗浄弁
１８および洗浄ポンプ１３に指令を出して洗浄が
開始される。 Next, the operation of the apparatus having the above configuration will be explained.
When the bed becomes clogged during the original overoperation of the rapid overflow basin 1 and the signal from the differential pressure transmitter 15 becomes less than the overloss head value set in advance by the setting device 16, the comparator 17 starts the cleaning control sequence. A cleaning start signal is given to the device 14. Thereby, the cleaning control sequence device 14 operates to perform cleaning operation control, and issues commands to the water purification valve 3, wastewater valve 4, drain valve 5, cleaning valve 18, and cleaning pump 13, and cleaning is started.
この洗浄制御シーケンス装置１４の作用は特に
新しいものではないので説明は省略する。 The operation of this cleaning control sequence device 14 is not particularly new, so its explanation will be omitted.
洗浄が開始されると、砂層を有する床２は洗
浄弁１８を通して下方より上方へ流入する洗浄水
の流速により、その砂層の砂に付着している汚物
は脱離され、洗浄水に混合されて床２の上部よ
り溢れ、溢水槽１ａへ落ちる。そして、排水弁５
を通つて導出管７へ放出されるが、その際、途中
に設けられた濁度計８により、その濁度が検出さ
れる。このときの濁度計８の信号の時間的変化は
第２図に示すようになる。 When cleaning is started, the bed 2 having a sand layer is cleaned by the flow rate of the cleaning water flowing from the bottom to the top through the cleaning valve 18, and the dirt adhering to the sand in the sand layer is removed and mixed with the cleaning water. It overflows from the top of floor 2 and falls into overflow tank 1a. And drain valve 5
The water is discharged through the outlet pipe 7, and at that time, its turbidity is detected by a turbidity meter 8 provided in the middle. The temporal change in the signal from the turbidity meter 8 at this time is as shown in FIG.
すなわち、図は縦軸に濁度、横軸に時間をとつ
たもので、洗浄開始直後における濁度計８の検出
値は零だが、その後洗浄が進むにつれて濁度は急
激に増加し、やがて濁度は最大値Ｄhに達する。
更に洗浄を続けると汚れが少なくなつて来るため
に次第に濁度は減少し、やがて最小値Ｄeに達す
る。 In other words, the figure shows turbidity on the vertical axis and time on the horizontal axis.The detected value of the turbidity meter 8 is zero immediately after the start of cleaning, but as the cleaning progresses, the turbidity increases rapidly, and eventually becomes turbid. degree reaches its maximum value D h .
As the washing continues, the turbidity gradually decreases as the amount of dirt decreases, and eventually reaches the minimum value De .
洗浄効果を必要十分な洗浄排水濁度Ｄpに見い
出し、その値を設定器１２に設定して、洗浄停止
信号として用いる場合、その必要十分な洗浄排水
濁度Ｄpを与える時間は、濁度増加中の時刻Ts時
と濁度減少中の時刻Te時の２点あり、後者の場
合のみ洗浄停止とするためには、両者の判別を行
なう必要がある。 If the cleaning effect is determined by the necessary and sufficient cleaning waste water turbidity D p and that value is set in the setting device 12 and used as a cleaning stop signal, the time to provide the necessary and sufficient cleaning waste water turbidity D p is determined by the turbidity. There are two points, time Ts when the turbidity is increasing and time Te when the turbidity is decreasing, and in order to stop cleaning only in the latter case, it is necessary to distinguish between the two.
そこで、微分演算器９を設置し、濁度計８の信
号をこれに入力して濁度の変化を検出する。微分
演算器９は入力信号の変化を検出するものであ
り、濁度が増加中は微分演算器９の出力は正とな
り、減少中には、負となるため後者の負の出力信
号が入力されると動作するリミツタ１０は、濁度
減少中のこの負の出力信号を比較器１１に入力す
る。その結果、この入力により比較器１１は動作
状態となり、濁度計８からの信号があらかじめ設
定器１２に設定した値Ｄpより小さくなつたと
き、比較器１１は洗浄制御シーケンス装置１４に
洗浄終了信号を与える。 Therefore, a differential calculator 9 is installed, and the signal from the turbidity meter 8 is input thereto to detect changes in turbidity. The differential calculator 9 detects changes in the input signal, and when the turbidity is increasing, the output of the differential calculator 9 is positive, and when it is decreasing, it is negative, so the latter negative output signal is input. The limiter 10, which operates when the turbidity is reduced, inputs this negative output signal to the comparator 11 during the turbidity reduction. As a result, this input puts the comparator 11 into the operating state, and when the signal from the turbidity meter 8 becomes smaller than the value D p preset in the setting device 12, the comparator 11 tells the cleaning control sequence device 14 to complete the cleaning. give a signal.
これにより、洗浄制御シーケンス装置１４は浄
化弁３、捨水弁４、排水弁５、洗浄弁１８および
洗浄水ポンプ１３に指令を出して洗浄を終了さ
せ、再び急速過運転に入る。 As a result, the cleaning control sequence device 14 issues commands to the purification valve 3, wastewater valve 4, drain valve 5, cleaning valve 18, and cleaning water pump 13 to end the cleaning, and then enters rapid overoperation again.
以上、説明したように、本発明により急速過
池の洗浄が必要かつ十分に行なえるようになる。
１台の急速過池のみの洗浄を考えねば従来方式
のタイマによる定時間制御を利用し、多少時間を
多目に設定して洗浄運転しても十分であるが近時
のように３桁にも及ぶ多数の急速過池群の運転
管理を考える場合はもはや従来方式では合理的な
運営は困難となるが、本発明によれば急速過池
群の最適運営が可能となる。すなわち過池群と
しては本来の過の運転を行ない、そのうちのい
くつかは全体の過運転に支障なくしかも過不足
のない洗浄を行なうことができ、全体をにらんで
の群制御の最適化が可能となる。 As explained above, according to the present invention, the rapid overflow basin can be cleaned both necessary and sufficiently.
If you are thinking about cleaning only one rapid overflow basin, it is sufficient to use the conventional fixed time control with a timer and set the time a little longer for cleaning operation, but as recently When considering the operation and management of a large number of rapid over ponding groups, it is no longer possible to rationally manage them using conventional methods, but according to the present invention, optimal management of rapid over ponding groups is possible. In other words, the over-pool group performs the original over-operation, and some of them can be cleaned without affecting the overall over-operation and without too much or too little, and the group control can be optimized from an overall perspective. It becomes possible.
以上詳述したように本発明は砂層を有する床
を備え、この床を介してその下部側より過済
み液を取り出すようにし、また前記下部側より洗
浄水を送つて前記床の洗浄を行なう洗浄機能を
備えて、過運転及び洗浄運転を行なうことので
きるようにした急速過池において、前記床上
下側間の圧力差を検出する手段と、この検出した
圧力差が所定の過損失水頭以下となつたとき前
記床の洗浄運転の開始信号を発生する手段と、
洗浄運転により前記床を通つてその上部より溢
れる洗浄使用済み排水の濁度を検出する手段と、
この濁度の検出出力を微分してその変化を増減に
対応した極性をもつて検出する手段と、これによ
り検出された変化を入力とし、この変化が減少に
相当する極性のとき出力を発生する手段と、この
出力を受け且つ前記濁度の検出出力が所定値とな
つたとき洗浄運転終了を指示する信号を発生する
手段を設けて構成し、床の洗浄開始は床の上
下側間の圧力差が所定値になつたときに、また洗
浄終了は床を洗浄しれ水の濁度が増加方向から
減少方向に転じた後、所定濁度値以下となつたと
き行なうようにしたので、床の洗浄が必要とな
つた時点で洗浄運転を行なうことができ、しかも
洗浄の進行を洗浄効果と密接な関係のある床洗
浄に使用した水の濁度の変化の傾向と濁度レベル
によつて知るようにしたので、最適状態に洗浄さ
れた時点で洗浄運転を終了させることができ、従
つて、これらの点より多数の過池の群制御が効
果的に行なえる等、高精度で最適な洗浄運転制御
を可能とした急速過池の自動洗浄制御装置を提
供することができる。 As detailed above, the present invention is provided with a bed having a sand layer, the waste liquid is taken out from the lower side of the bed through this bed, and the washing water is sent from the lower side to clean the bed. In a rapid overflow pond equipped with a function to enable overoperation and cleaning operation, there is provided means for detecting a pressure difference between the upper and lower sides of the bed, and whether the detected pressure difference is below a predetermined overflow head loss. means for generating a start signal for the floor cleaning operation when the floor is wet;
means for detecting the turbidity of the used cleaning wastewater overflowing from the top through the floor during the cleaning operation;
A means for differentiating this turbidity detection output and detecting the change with a polarity corresponding to an increase/decrease, and using the detected change as an input, and generating an output when this change has a polarity corresponding to a decrease. and a means for receiving this output and generating a signal instructing the end of the cleaning operation when the turbidity detection output reaches a predetermined value, and the floor cleaning is started by the pressure between the upper and lower sides of the floor. Cleaning is completed when the difference reaches a predetermined value, and after the floor has been washed and the turbidity of the water changes from increasing to decreasing, the turbidity of the water drops below the predetermined value. Cleaning operation can be started when cleaning is required, and the progress of cleaning can be monitored by the trend and turbidity level of the turbidity of the water used for floor cleaning, which is closely related to cleaning effectiveness. As a result, the cleaning operation can be terminated when the cleaning is in the optimal state. Therefore, from these points, group control of a large number of overflow ponds can be effectively performed, resulting in highly accurate and optimal cleaning. It is possible to provide an automatic cleaning control device for a rapid overflow pond that enables operational control.
尚、本発明は上記し且つ図面に示す実施例に限
定することなくその要旨を変更しない範囲で適宜
変形して実施し得る。 It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within the scope of the invention.
第１図は本発明の一実施例を示すブロツク図、
第２図は洗浄過程における床洗浄使用済みの排
水の濁度変化を示す図である。
１…急速過池、２…床、３…浄水弁、４…
捨水弁、５…排水弁、６…逆止弁、８…濁度計、
９…微分演算器、１０…リミツタ、１１，１７…
比較器、１２，１６…設定器、１３…洗浄水ポン
プ、１４…洗浄制御シーケンス装置、１５…差圧
伝送器、１８…洗浄弁。
FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a diagram showing changes in turbidity of wastewater after floor cleaning during the cleaning process. 1... Rapid filter basin, 2... Floor, 3... Water purification valve, 4...
Discharge valve, 5... Drain valve, 6... Check valve, 8... Turbidity meter,
9... Differential calculator, 10... Limiter, 11, 17...
Comparator, 12, 16... Setting device, 13... Cleaning water pump, 14... Cleaning control sequence device, 15... Differential pressure transmitter, 18... Cleaning valve.
Claims (1)
出すようにし、また前記下部側より洗浄水を送つ
て前記床の洗浄を行なう洗浄機能を備えて過
運転及び洗浄運転を行なうことのできるようにし
た急速過池において、前記床上下側間の圧力
差を検出する手段と、この検出した圧力差が所定
の過損失水頭以下となつたとき前記床の洗浄
運転の開始信号を発生する手段と、洗浄運転によ
り前記床洗浄に用いられた排水の濁度を検出す
る手段と、この濁度検出出力からその変化の増減
方向を検出する手段と、この検出結果が減方向で
あり且つ前記濁度検出出力が所定値となつたとき
洗浄運転の終了信号を発生する手段とを備えたこ
とを特徴とする急速過池の自動洗浄制御装置。 ２ 前記濁度検出出力の変化の増減方向検出手段
は微分を行なつてその出力極性より検出させるこ
とを特徴とする特許請求の範囲第１項記載の急速
過池の自動洗浄制御装置。[Scope of Claims] 1. Overrun and cleaning operation are carried out by providing a cleaning function that takes out the overflow liquid from the lower side of the floor through the floor, and also sends cleaning water from the lower side to clean the floor. A means for detecting a pressure difference between the upper and lower sides of the floor, and a means for generating a start signal for cleaning the floor when the detected pressure difference becomes less than a predetermined excess head loss. means for detecting the turbidity of the wastewater used for floor cleaning through a cleaning operation; means for detecting the increasing or decreasing direction of the change from the turbidity detection output, and the detection result is in the decreasing direction; An automatic cleaning control device for a rapid overflow pond, comprising means for generating a cleaning operation end signal when the turbidity detection output reaches a predetermined value. 2. The automatic cleaning control device for a rapid overflow basin according to claim 1, wherein the means for detecting an increase/decrease direction of change in the turbidity detection output performs differentiation and detects the output polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8882580A JPS5715812A (en) | 1980-06-30 | 1980-06-30 | Automatic washing control device for rapid filter basin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8882580A JPS5715812A (en) | 1980-06-30 | 1980-06-30 | Automatic washing control device for rapid filter basin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5715812A JPS5715812A (en) | 1982-01-27 |
| JPS6241052B2 true JPS6241052B2 (en) | 1987-09-01 |
Family
ID=13953703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8882580A Granted JPS5715812A (en) | 1980-06-30 | 1980-06-30 | Automatic washing control device for rapid filter basin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5715812A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0195216U (en) * | 1987-12-16 | 1989-06-23 | ||
| JPH03137907A (en) * | 1989-10-24 | 1991-06-12 | Ebara Infilco Co Ltd | Washing control of filtration device |
| JPH11333213A (en) * | 1998-05-29 | 1999-12-07 | Meidensha Corp | Apparatus and method for washing control of filtration basin |
| CN103394218A (en) * | 2013-08-19 | 2013-11-20 | 南通中正机械有限公司 | Diversion self-cleaning type filter |
| CN110052078A (en) * | 2019-05-30 | 2019-07-26 | 宁夏尚禹节水科技有限公司 | Compound automatic backwashing filter and filter method |
-
1980
- 1980-06-30 JP JP8882580A patent/JPS5715812A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5715812A (en) | 1982-01-27 |
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