JP2779995B2 - Water level control device - Google Patents
Water level control deviceInfo
- Publication number
- JP2779995B2 JP2779995B2 JP5039390A JP3939093A JP2779995B2 JP 2779995 B2 JP2779995 B2 JP 2779995B2 JP 5039390 A JP5039390 A JP 5039390A JP 3939093 A JP3939093 A JP 3939093A JP 2779995 B2 JP2779995 B2 JP 2779995B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- water level
- flow rate
- drainage
- target
- 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 - Fee Related
Links
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- Control Of Positive-Displacement Pumps (AREA)
- Control Of Non-Electrical Variables (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は目標水位が時間と共に変
化する水槽内の水位を該目標水位に維持する水位制御装
置に関し、例えば潮汐のように水位が任意の波形で周期
的に上下を繰り返す場合に、湾内の水の流れ等を実験す
る等に利用する水槽内の水位を任意の波形で周期的に上
下させる場合に好適な水位制御装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water level control device for maintaining a water level in a water tank in which a target water level changes with time at the target water level. For example, the water level periodically repeats up and down with an arbitrary waveform such as tide. The present invention relates to a water level control device suitable for periodically raising and lowering the water level in an aquarium with an arbitrary waveform for use in experiments on the flow of water in a bay or the like.
【０００２】[0002]
【従来技術】従来この種の水位制御装置は、水槽内の水
位が時間と共に周期的に上下するため、水の流れは水槽
に入ったり出たりする。この場合、１台のポンプを使用
し、弁制御により水の流れ方向を変える方法もあるが、
水位変化が少なく水の出入りが無い時は、ポンプ流量が
零となり、締切り運転状態になるため、通常は図２又は
図３に示すような構成の水位制御装置で水位制御が行な
われている。2. Description of the Related Art Conventionally, in this type of water level control device, the water level in a water tank fluctuates periodically with time, so that water flows into and out of the water tank. In this case, there is a method of using one pump and changing the flow direction of water by valve control.
When the water level change is small and there is no water ingress or egress, the pump flow rate becomes zero and the pump enters a shutoff operation state. Therefore, the water level control is usually performed by a water level control device having a configuration as shown in FIG. 2 or FIG.
【０００３】図２において、１０１は水槽であり、該水
槽１０１には給水ポンプ１０３から流量制御弁１０６を
通して給水され、水槽１０１からは一定流量の水が排水
されている。該水槽１０１内の水位Ｌは水位センサ１０
２で検出されて制御回路１０４に伝送される。制御回路
１０４には目標水位発生器１０５から時間と共に変化す
る目標水位Ｌの信号が与えられ、制御回路１０４は流量
制御弁１０６の開度を制御して水槽１０１内の水位Ｌａ
がこの目標水位Ｌになるように制御する。In FIG. 2, reference numeral 101 denotes a water tank. Water is supplied to the water tank 101 from a water supply pump 103 through a flow control valve 106, and a constant flow of water is drained from the water tank 101. The water level L in the water tank 101 is determined by a water level sensor 10.
2 and is transmitted to the control circuit 104. The control circuit 104 is supplied with a signal of the target water level L that changes with time from the target water level generator 105. The control circuit 104 controls the opening of the flow control valve 106 to control the water level La in the water tank 101.
Is controlled to reach the target water level L.
【０００４】図３に示す水位制御装置は、排水側にも排
水ポンプ１０７及び流量制御弁１０８を設け、目標水位
発生器１０５により流量制御弁１０８の開度を制御し
て、目標水位Ｌに応じて排水流量も制御しようとするも
のである。The water level control device shown in FIG. 3 is provided with a drainage pump 107 and a flow control valve 108 also on the drain side, and the opening of the flow control valve 108 is controlled by a target water level generator 105 so as to correspond to the target water level L. To control the drainage flow rate.
【０００５】[0005]
【発明が解決しようとする課題】図２に示す水位制御装
置は、一定水量を水槽１０１より外に捨てながら、実際
の水位Ｌａと目標水位Ｌとを比較し、水量制御を行なう
方法であるが、この場合には給水ポンプ１０３の定格流
量は排水流量より大きく、且つその水量は目標水位の最
大水位上昇速度に見合った水量と排水流量の合計流量以
上の容量が必要である。また、排水流量は目標水位Ｌの
最大水位下降速度に見合った水量と、給水ポンプ１０３
のミニマムフロー（ポンプとして連続して運転して支障
のない最小水量）の合計水量以上の水量を排水する必要
がある。従って、給水ポンプ１０３に大容量のポンプが
必要となるという問題があった。The water level control apparatus shown in FIG. 2 is a method for comparing the actual water level La with the target water level L while discarding a certain amount of water outside the water tank 101, and controlling the water level. In this case, the rated flow rate of the water supply pump 103 is larger than the drainage flow rate, and the water flow rate needs to be equal to or greater than the total flow rate of the water flow rate and the drainage flow rate corresponding to the maximum water level rising speed of the target water level. Further, the drainage flow rate is determined by the amount of water corresponding to the maximum water level descending speed of the target water level L and the water supply pump 103.
It is necessary to drain more water than the minimum flow (minimum amount of water that can be operated continuously as a pump without any problem). Therefore, there is a problem that a large capacity pump is required for the water supply pump 103.
【０００６】これに対して、図３に示す水位制御装置は
排水側にも排水ポンプ１０７及び流量制御弁１０８を設
け、排水流量を制御するものであるが、この場合は流量
制御弁１０６及び１０８の弁開度が安定しないという問
題があった。つまり水槽１０１内の水位が上昇している
時に流入水量として１０必要であった場合、給水ポンプ
１０３の流量Ｐ１と排水ポンプ１０８の流量Ｐ２の組み
合わせが、Ｐ１＝１２とＰ２＝２の組み合わせでも、Ｐ
１＝１３とＰ２＝３の組み合わせでも、流入水量は１０
となり、流量制御弁１０６及び１０８の弁開度が決定で
きない。従って、安定した制御ができないという問題が
あった。On the other hand, the water level control device shown in FIG. 3 is provided with a drain pump 107 and a flow control valve 108 also on the drain side to control the drain flow rate. In this case, the flow control valves 106 and 108 are used. There is a problem that the valve opening degree is not stable. That is, when the inflow water amount is required to be 10 when the water level in the water tank 101 is rising, even if the combination of the flow rate P1 of the water supply pump 103 and the flow rate P2 of the drainage pump 108 is a combination of P1 = 12 and P2 = 2, P
Even with the combination of 1 = 13 and P2 = 3, the inflow water amount is 10
Therefore, the opening degrees of the flow control valves 106 and 108 cannot be determined. Therefore, there is a problem that stable control cannot be performed.
【０００７】本発明は上述の点に鑑みてなされたもの
で、上記問題点を除去し給水ポンプ等の給水手段の容量
が少なくて済み、且つ安定した制御が可能な水位制御装
置を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a water level control device which eliminates the above problems, requires only a small capacity of water supply means such as a water supply pump, and can perform stable control. With the goal.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
本発明は、水槽と、該水槽に給水する給水手段と該水槽
から排水する排水手段を具備し、水槽内の水位を時間と
共に変化する目標水位に維持する水位制御装置におい
て、給水手段による給水流量又は排水手段による排水流
量の何れか一方を前記目標水位の変化率より求められる
流量に追従するように制御する第１の流量制御手段と、
他方の排水手段による排水流量又は給水手段による給水
流量を前記水位が前記目標水位に追従するように制御す
る第２の流量制御手段を設けた。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a water tank, a water supply means for supplying water to the water tank, and a drain means for draining water from the water tank, and the water level in the water tank changes with time. In a water level control device for maintaining a target water level, a first flow rate control means for controlling either one of a water supply flow rate by a water supply means or a drainage flow rate by a drainage means so as to follow a flow rate obtained from a change rate of the target water level; ,
A second flow control means is provided for controlling the flow rate of drainage by the other drainage means or the flow rate of water supply by the water supply means so that the water level follows the target water level.
【０００９】[0009]
【作用】本発明によれば、水位制御装置を上記のように
構成することにより、第１の流量制御手段は給水手段に
よる給水流量又は排水手段による排水流量の何れか一方
を目標水位の変化率より求められる流量に追従するよう
に制御し、第２の流量制御手段は他方の排水手段による
排水流量又は給水手段による給水流量を水位が目標水位
に追従するように制御するので、安定した水位制御が得
られる。According to the present invention, by configuring the water level control device as described above, the first flow rate control means determines whether one of the water supply flow rate by the water supply means and the drainage flow rate by the drainage means is the change rate of the target water level. The second flow control means controls the drainage flow rate of the other drainage means or the water supply flow rate of the water supply means so that the water level follows the target water level. Is obtained.
【００１０】[0010]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図１は本発明の水位制御装置の構成を示す図であ
る。図１において、１は水槽であり、該水槽１の給水側
には給水ポンプ２と流量制御弁３が接続され、排水側に
は排水ポンプ４と流量制御弁５が接続されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a water level control device of the present invention. In FIG. 1, reference numeral 1 denotes a water tank. A water supply pump 2 and a flow control valve 3 are connected to a water supply side of the water tank 1, and a drain pump 4 and a flow control valve 5 are connected to a drain side.
【００１１】６は給水側の流量を制御する制御回路であ
り、水槽１内の水位を検出する水位センサ９で検出した
水位Ｌａと目標水位発生器８からの時間と共に変位する
目標水位Ｌとが入力され、実際の水位Ｌａが目標水位Ｌ
に追従するように流量制御弁３に開度信号Ｖｓ１を送
り、弁開度を制御して給水流量を制御する。Reference numeral 6 denotes a control circuit for controlling the flow rate on the water supply side, wherein the water level La detected by the water level sensor 9 for detecting the water level in the water tank 1 and the target water level L changing with time from the target water level generator 8. The actual water level La is input to the target water level L
An opening signal Vs1 is sent to the flow control valve 3 so as to follow the flow rate, and the valve opening is controlled to control the supply water flow rate.
【００１２】７は排水側の流量を制御する制御回路であ
り、該制御回路７には目標流量演算器１１で演算された
目標水量Ｑ２と流量計１２で測定された実際の排水量Ｑ
２ａを入力し、目標水量Ｑ２と排水量Ｑ２ａを比較し、
該排水量Ｑ２ａが目標水量Ｑ２になるように流量制御弁
５に開度信号Ｖｓ２を送り、弁開度を制御する。前記目
標水量Ｑ２は目標水位発生器８から目標水位Ｌを微分回
路１０で微分して求めた水位変化率（ｄＬ／ｄｔ）を基
に目標流量演算器１１で予め決められた方法を用いて求
める。上記のように排水量Ｑ２ａは、目標水位Ｌを微分
して得られた水位変化率より演算された目標水量Ｑ２に
なるように制御され、小水量でよい時は小水量に、大水
量が必要な時は大水量となるように無駄なく運転され
る。Reference numeral 7 denotes a control circuit for controlling the flow rate on the drain side. The control circuit 7 includes a target water amount Q2 calculated by the target flow rate calculator 11 and an actual drainage amount Q measured by the flow meter 12.
2a, compare the target water volume Q2 with the drainage volume Q2a,
An opening signal Vs2 is sent to the flow control valve 5 to control the valve opening so that the drainage amount Q2a becomes the target water amount Q2. The target water amount Q2 is obtained by a method predetermined by the target flow rate calculator 11 based on the water level change rate (dL / dt) obtained by differentiating the target water level L from the target water level generator 8 by the differentiating circuit 10. . As described above, the drainage amount Q2a is controlled so as to become the target water amount Q2 calculated from the water level change rate obtained by differentiating the target water level L. When a small water amount is sufficient, a small water amount and a large water amount are required. At times, it is operated without waste so as to have a large amount of water.
【００１３】次に、上記水位制御装置における給水ポン
プ２及び排水ポンプ４の定格流量及び目標水量Ｑ２の決
め方を説明する。 （１）給水ポンプ２の定格流量 時間により変位する目標水位Ｌの最大水位上昇率を（ｄ
Ｌ／ｄｔ）maxとする。排水ポンプ４のミニマムフロー
（ポンプとして連続運転して支障のない最小水量）を
（Ｑ２ａ）minとし、水槽１の断面積Ａとする。水槽１
にとって、水の流入量の最大は （ｄＬ／ｄｔ）max×Ａ となる。従って、給水ポンプ２の定格流量Ｑ１は、 （ｄＬ／ｄｔ）max×Ａ＋（Ｑ２ａ）min 以上の流量が必要となる。ここで水槽１の断面Ａが一定
でない時は、上記（ｄＬ／ｄｔ）max×Ａは、水位が最
大上昇率で上がるのに必要な水量、即ち ｛（ｄＬ／ｄｔ）×Ａ｝max であればよい。Next, how to determine the rated flow rate and the target water amount Q2 of the water supply pump 2 and the drainage pump 4 in the water level control device will be described. (1) The rated flow rate of the feed water pump 2
L / dt) max. The minimum flow of the drainage pump 4 (the minimum amount of water that does not hinder continuous operation as a pump) is (Q2a) min, and the sectional area A of the water tank 1 is assumed. Aquarium 1
Therefore, the maximum inflow of water is (dL / dt) max × A. Therefore, the rated flow rate Q1 of the feedwater pump 2 needs to be equal to or more than (dL / dt) max × A + (Q2a) min. Here, when the cross section A of the water tank 1 is not constant, the above (dL / dt) max × A is the amount of water necessary for the water level to rise at the maximum rising rate, that is, ｛(dL / dt) × A｝ max. I just need.
【００１４】（２）排水ポンプ４の定格流量 排水ポンプ４の定格流量は給水ポンプ２の定格流量と逆
に考えれば良い。目標水位の最大低下率を（−ｄＬ／ｄ
ｔ）max、給水ポンプ２のミニマムフローを（Ｑ１）mi
n、水槽１の断面積Ａとすると、排水ポンプ４の定格流
量（Ｑ２ａ）ｐは、 （−ｄＬ／ｄｔ）max×Ａ＋（Ｑ１）min 以上必要となる。ここで水槽１の断面Ａが一定でない時
は、上記（−ｄＬ／ｄｔ）max×Ａは、水位が最大上昇
率で上がるのに必要な水量、即ち｛（−ｄＬ／ｄｔ）×
Ａ｝maxであればよい。(2) Rated flow rate of the drainage pump 4 The rated flow rate of the drainage pump 4 may be considered to be opposite to the rated flow rate of the feedwater pump 2. The maximum rate of decrease of the target water level is (-dL / d
t) max, minimum flow of feed water pump 2 is (Q1) mi
n, assuming that the cross-sectional area of the water tank 1 is A, the rated flow rate (Q2a) p of the drainage pump 4 needs to be at least (-dL / dt) max × A + (Q1) min. Here, when the cross section A of the water tank 1 is not constant, the above (−dL / dt) max × A is the amount of water necessary for the water level to rise at the maximum rising rate, that is, ｛(−dL / dt) ×
It is sufficient if A｝ max.
【００１５】（３）目標水量Ｑ２の演算 目標流量Ｑ２の演算の仕方は、 （ｄＬ／ｄｔ）maxの時・・・・・・・（Ｑ２ａ）min （１） ・・・・・・・・・・ ・・・・・・・・・・（２） ・・・・・・・・・・ ・・・・・・・・・・ （−ｄＬ／ｄｔ）maxの時・・・・・・・（Ｑ２ａ）ｐ （ｎ） となり、上記（１），（２）・・・・・・（ｎ）式の間
はｄＬ／ｄｔに応じて線形補間して目標水位Ｑ２を求め
る。(3) Calculation of Target Water Volume Q2 The calculation method of the target flow rate Q2 is as follows: (dL / dt) max... (Q2a) min (1). ····················· (2) ··································· (Q2a) p (n), and between the above equations (1), (2),... (N), the target water level Q2 is obtained by linear interpolation according to dL / dt.
【００１６】（４）その他 目標水位発生器８により、水槽１内の目標水位Ｌを与え
る。この目標水位Ｌは、時間−水位の点列で与えたり、
関数で与えたり、デジタイザーによる入力等いろいろな
ものがある。なお、前述のように給水ポンプ２及び排水
ポンプ４のポンプ容量を決めているので、予め予定して
いるより大きな水位上昇率又は水位低下率を与えること
はできない。(4) Others The target water level L in the water tank 1 is given by the target water level generator 8. This target water level L is given by a time-water level point sequence,
There are various things such as giving by function and input by digitizer. Since the pump capacities of the water supply pump 2 and the drainage pump 4 are determined as described above, it is not possible to provide a higher water level rising rate or a lowering rate than planned.
【００１７】なお、上記実施例では給水流量Ｑ１を水槽
１の水位Ｌａが目標水位Ｌに追従するように制御し、排
水流量Ｑ２ａを目標水位Ｌの変化率（ｄＬ／ｄｔ）より
求められる目標流量Ｑ２に追従するように制御したが、
反対に排水流量Ｑ２ａを水槽１の水位Ｌａが目標水位Ｌ
に追従するように制御し、給水流量Ｑ１を目標水位Ｌの
変化率（ｄＬ／ｄｔ）より求められる流量に追従するよ
うに制御してもよい。また、給水ポンプ２及び排水ポン
プ４は複数台にしてもよい。In the above embodiment, the water supply flow rate Q1 is controlled so that the water level La of the water tank 1 follows the target water level L, and the drainage flow rate Q2a is set to the target flow rate obtained from the rate of change (dL / dt) of the target water level L. We controlled to follow Q2,
Conversely, the drainage flow rate Q2a is set to the target water level L
And the supply water flow rate Q1 may be controlled to follow a flow rate obtained from the change rate (dL / dt) of the target water level L. Further, a plurality of water supply pumps 2 and drainage pumps 4 may be provided.
【００１８】図１において、制御回路６にはワンループ
コントローラ等のコントローラで構成し、微分回路１０
及び目標流量演算器１１を一括してプログラマブルコン
トローラとすることもできる。また、給水元と排水元を
一つの水槽とすれば水は循環して使用することができ
る。In FIG. 1, the control circuit 6 comprises a controller such as a one-loop controller,
The target flow rate calculator 11 may be collectively a programmable controller. In addition, if the water supply source and the drainage source are one water tank, the water can be circulated and used.
【００１９】また、上記のように給水元と排水元を一つ
の水槽にして水を循環させて使用する場合、図４に示す
ように、給水元及び排水元となる水槽２０を水槽１より
高い位置に設け、排水ポンプ４で流量制御弁５を通して
排水を水槽２０に送水し、給水は水槽２０より自然流下
により水槽１に供給する。この場合、流量制御弁５には
図１の開度信号Ｖｓ２を供給し、弁開度を制御し、流量
制御弁３には開度信号Ｖｓ１を供給し、弁開度を制御す
るようにする。When the water supply source and the drainage source are combined into one water tank and the water is circulated as described above, the water tank 20 serving as the water supply source and the drainage source is higher than the water tank 1 as shown in FIG. Water is supplied to the water tank 20 by the drain pump 4 through the flow control valve 5 through the flow control valve 5, and water is supplied to the water tank 1 by natural flow from the water tank 20. In this case, the opening signal Vs2 of FIG. 1 is supplied to the flow control valve 5 to control the valve opening, and the opening signal Vs1 is supplied to the flow control valve 3 to control the valve opening. .
【００２０】また、図５に示すように、水槽３０を水槽
１より低い位置に設け、排水を自然流下により水槽３０
に送るようにし、給水を給水ポンプ２により水槽１に送
水するようにしてもよい。この場合、給水側の流量制御
弁３には開度信号Ｖｓ１を供給し、弁開度を制御し、排
水側の流量制御弁５には開度信号Ｖｓ２を供給し、弁開
度を制御する。Further, as shown in FIG. 5, the water tank 30 is provided at a position lower than the water tank 1, and the waste water is drained by gravity.
The water may be supplied to the water tank 1 by the water supply pump 2. In this case, an opening signal Vs1 is supplied to the flow control valve 3 on the water supply side to control the valve opening, and an opening signal Vs2 is supplied to the flow control valve 5 on the drainage side to control the valve opening. .
【００２１】[0021]
【発明の効果】以上説明したように本発明によれば、第
１の流量制御手段により給水手段による給水流量又は排
水手段による排水流量の何れか一方を目標水位の変化率
より求められる流量に追従するように制御し、第２の流
量制御手段により他方の排水手段による排水流量又は給
水手段による給水流量を水位が目標水位に追従するよう
に制御するので、安定した水位制御が得られると同時
に、ポンプ等の給水手段及び排水手段の容量を最小に選
定することが可能となる。As described above, according to the present invention, either one of the flow rate of the water supplied by the water supply means and the flow rate of the waste water by the drainage means is tracked by the first flow rate control means to the flow rate obtained from the change rate of the target water level. And the second flow rate control means controls the drain flow rate by the other drainage means or the water supply flow rate by the water supply means so that the water level follows the target water level, so that a stable water level control is obtained, It is possible to minimize the capacity of water supply means and drainage means such as a pump.
【図１】本発明の水位制御装置の構成を示す図である。FIG. 1 is a diagram showing a configuration of a water level control device of the present invention.
【図２】従来の水位制御装置の構成例を示す図である。FIG. 2 is a diagram illustrating a configuration example of a conventional water level control device.
【図３】従来の水位制御装置の構成例を示す図である。FIG. 3 is a diagram illustrating a configuration example of a conventional water level control device.
【図４】本発明の水位制御装置の構成を示す図である。FIG. 4 is a diagram showing a configuration of a water level control device of the present invention.
【図５】本発明の水位制御装置の構成を示す図である。FIG. 5 is a diagram showing a configuration of a water level control device of the present invention.
１ 水槽 ２ 給水ポンプ ３ 流量制御弁 ４ 排水ポンプ ５ 流量制御弁 ６ 制御回路 ７ 制御回路 ８ 目標水位発生器 ９ 水位センサ １０ 微分回路 １１ 目標流量演算器 １２ 流量計 ２０ 水槽 ３０ 水槽 DESCRIPTION OF SYMBOLS 1 Water tank 2 Water supply pump 3 Flow control valve 4 Drain pump 5 Flow control valve 6 Control circuit 7 Control circuit 8 Target water level generator 9 Water level sensor 10 Differentiation circuit 11 Target flow calculator 12 Flow meter 20 Water tank 30 Water tank
Claims (2)
水槽から排水する排水手段を具備し、前記水槽内の水位
を時間と共に変化する目標水位に維持する水位制御装置
において、 前記給水手段による給水流量又は前記排水手段による排
水流量の何れか一方を前記目標水位の変化率より求めら
れる流量に追従するように制御する第１の流量制御手段
と、 他方の前記排水手段による排水流量又は前記給水手段に
よる給水流量を前記水位が前記目標水位に追従するよう
に制御する第２の流量制御手段を設けたことを特徴とす
る水位制御装置。1. A water level control device, comprising: a water tank, a water supply means for supplying water to the water tank, and a drain means for draining water from the water tank, wherein the water level control device maintains a water level in the water tank at a target water level that changes with time. A first flow rate control means for controlling one of a supply water flow rate and a drainage flow rate by the drainage means to follow a flow rate obtained from the rate of change of the target water level; and a drainage flow rate by the other drainage means or A water level control device provided with second flow rate control means for controlling a flow rate of water supplied by a water supply means so that the water level follows the target water level.
又はポンプ回転数制御手段を具備し、前記第１及び第２
の流量制御手段は該流量制御弁の弁開度又はポンプ回転
数を制御して流量を制御する手段であることを特徴とす
る請求項１に記載の水位制御装置。2. The water supply means and the water discharge means include a flow rate control valve or a pump speed control means, and the first and second water supply means and the pump speed control means are provided.
The water level control device according to claim 1, wherein the flow rate control means is a means for controlling the flow rate by controlling the valve opening degree or the pump speed of the flow rate control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5039390A JP2779995B2 (en) | 1993-02-03 | 1993-02-03 | Water level control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5039390A JP2779995B2 (en) | 1993-02-03 | 1993-02-03 | Water level control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06230831A JPH06230831A (en) | 1994-08-19 |
| JP2779995B2 true JP2779995B2 (en) | 1998-07-23 |
Family
ID=12551684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5039390A Expired - Fee Related JP2779995B2 (en) | 1993-02-03 | 1993-02-03 | Water level control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2779995B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MY138447A (en) | 2001-12-12 | 2009-06-30 | Btb Wallercode Sdn Bhd | Improved liquid level controller |
| JP5063633B2 (en) * | 2009-03-11 | 2012-10-31 | 日立Ｇｅニュークリア・エナジー株式会社 | Overflow check valve operation inspection system and operation inspection method |
| JP2012060283A (en) * | 2010-09-07 | 2012-03-22 | Miura Co Ltd | Signal multiplexing method and signal multiplexing circuit |
| CN103953101A (en) * | 2014-05-21 | 2014-07-30 | 徐鹏 | Water collection type toilet-flushing water saver |
| CN106194253A (en) * | 2016-08-31 | 2016-12-07 | 北京和利时智能技术有限公司 | Transfer sump integration drainage system under a kind of mine |
| JP2020065992A (en) * | 2018-10-26 | 2020-04-30 | 臼井国際産業株式会社 | Gas dissolution device and algae culturing device |
| EP4030890A4 (en) * | 2019-09-20 | 2024-01-17 | Mjnn Llc | Fault handling in controlled environment agriculture |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56116118A (en) * | 1980-02-20 | 1981-09-11 | Hitachi Ltd | Water level controller |
-
1993
- 1993-02-03 JP JP5039390A patent/JP2779995B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06230831A (en) | 1994-08-19 |
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