JP2673741B2 - Operation method of horizontal axis pump - Google Patents
Operation method of horizontal axis pumpInfo
- Publication number
- JP2673741B2 JP2673741B2 JP26763990A JP26763990A JP2673741B2 JP 2673741 B2 JP2673741 B2 JP 2673741B2 JP 26763990 A JP26763990 A JP 26763990A JP 26763990 A JP26763990 A JP 26763990A JP 2673741 B2 JP2673741 B2 JP 2673741B2
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- JP
- Japan
- Prior art keywords
- water level
- time
- pumping start
- pumping
- start water
- 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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- Control Of Non-Positive-Displacement Pumps (AREA)
Description
【発明の詳細な説明】 [産業上の利用分野] 本発明は、横軸ポンプの運転方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for operating a horizontal shaft pump.
[従来の技術] 従来より、第2図に示す排水機場のポンプ吸水井1に
設置されている吸上げ型式の横軸ポンプでは、吸水井1
の水位が揚水開始水位HWLに到達した場合に、この水位H
WLを真空系2の圧力スイッチ23もしくは図示されていな
い水位検出手段によって検出し、この検出信号に基づい
て真空ポンプ20を起動させ、羽根車3の上流側に配置さ
れている吸込管4の内部を高負圧化させて、吸込管4内
の水をポンプケーシング5内の羽根車3に達するレベ
ル、つまり満水水位まで吸上げ、この状態を満水検知器
6によって検知したのち、満水検知信号に基づいて図示
されていないポンプ駆動用原動機(例えばディーゼルエ
ンジン)を起動して、ポンプの運転(羽根車3を回転)
を行い、その後吐出弁7を全開して排水運転(揚水運
転)する運転方法が採用されている。[Prior Art] In the conventional suction shaft type horizontal shaft pump installed in the pump suction well 1 of the drainage pump station shown in FIG.
When the water level reaches the pumping start water level HWL, this water level H
WL is detected by the pressure switch 23 of the vacuum system 2 or a water level detecting means (not shown), the vacuum pump 20 is started based on this detection signal, and the inside of the suction pipe 4 arranged upstream of the impeller 3 is detected. Is made to have a high negative pressure, and the water in the suction pipe 4 is sucked up to a level reaching the impeller 3 in the pump casing 5, that is, to the full water level, and this state is detected by the full water detector 6 Based on this, a pump driving motor (not shown) (for example, a diesel engine) is started to operate the pump (rotate the impeller 3).
Is performed, and then the discharge valve 7 is fully opened to perform the drainage operation (pumping operation).
[発明が解決しようとする課題] ところが、前記従来の運転方法では、吸水井1の水位
が揚水開始水位HWLに到達してから、吐出弁7を全開す
るのに時間がかかる。そのために、水位が揚水開始水位
HWLに到達してから実際に排水されるまでに比較的長い
待ち時間(約10分程度)を必要としている。[Problems to be Solved by the Invention] However, in the above-mentioned conventional operation method, it takes time to fully open the discharge valve 7 after the water level of the suction well 1 reaches the pumping start water level HWL. Therefore, the water level is the pumping start water level.
A relatively long waiting time (about 10 minutes) is required before the water is actually drained after reaching the HWL.
一方、近年は、都市化の進展に伴う舗装率の増大や緑
地の減少などにより、地層の保水機能が低下している。
しかも吸水井1への流入水量が増大しつつある傾向を有
しているので、所謂、鉄砲水のように突発的に大量の水
が急激に吸水井1に流入する事態を生じ易い。On the other hand, in recent years, the water retention function of the stratum has been reduced due to an increase in the pavement rate and a decrease in green spaces due to the progress of urbanization.
In addition, since there is a tendency that the amount of inflow water into the water absorption well 1 is increasing, a situation in which a large amount of water suddenly suddenly flows into the water absorption well 1 like a so-called flash flood easily occurs.
ところが、従来の横軸ポンプの運転方法では、吸水井
1の水位が揚水開始水位HWLに到達してから、揚水運転
が開始されるまでの間に、比較的長い待ち時間が必要で
あるから、大量の水が急激に吸水井1に流入する緊急時
に、揚水運転の開始タイミングに遅れを生じる場合があ
る。However, in the conventional horizontal axis pump operation method, a relatively long waiting time is required from when the water level of the suction well 1 reaches the pumping start water level HWL to when the pumping operation is started. In an emergency when a large amount of water suddenly flows into the water intake well 1, there may be a delay in the start timing of the pumping operation.
このように、揚水運転の開始タイミングが遅れると、
吸水井1の水位が異常に上昇して洪水の発生を招きかね
ない。Thus, if the start timing of the pumping operation is delayed,
The water level of the intake well 1 may rise abnormally and cause a flood.
本発明は、このような事情に鑑みなされたもので、吸
水井の水位の異常上昇による洪水の発生を防止すること
のできる横軸ポンプの運転方法の提供を目的としてい
る。The present invention has been made in view of such circumstances, and an object thereof is to provide a method for operating a horizontal shaft pump that can prevent the occurrence of a flood due to an abnormal rise in the water level of an intake well.
[課題を解決するための手段] 上記目的を達成するために、本発明に係る横軸ポンプ
の運転方法は、横軸ポンプが設置されている吸水井の水
位上昇を水位検知手段によって検出し、この水位検知手
段の検出信号に基づいて水位変化率を演算し、その演算
された水位変化率とあらかじめ設定されている揚水開始
水位に基づいて吸水井の水位が揚水開始水位に到達する
揚水開始水位到達時間を演算し、その演算された揚水開
始水位到達時間と吐出弁の全開所要時間とを比較して、
演算時点における揚水開始水位到達時間が前記全開所要
時間よりも長い場合は、吸水井の水位の上昇に伴って漸
次減少していく揚水開始水位到達時間が全開所要時間と
同一になった時点で開弁手段を起動させて、吐出弁を全
開させるように制御するものである。[Means for Solving the Problems] In order to achieve the above object, a method for operating a horizontal shaft pump according to the present invention detects a rise in water level of an intake well in which a horizontal shaft pump is installed by a water level detection means, The water level change rate is calculated based on the detection signal of this water level detection means, and the pumping start water level at which the water level of the suction well reaches the pumping start water level based on the calculated water level change rate and the preset pumping start water level. The arrival time is calculated, and the calculated pumping start water level arrival time is compared with the time required to fully open the discharge valve,
If the time to reach the pumping start water level at the time of calculation is longer than the time required to fully open the pump, the pump starts when the time to reach the pumping start water level, which gradually decreases as the water level in the suction well rises, becomes equal to the time required to fully open. The valve means is activated to control the discharge valve to be fully opened.
また、前記揚水開始水位到達時間と前記全開所要時間
との比較において、演算時点における揚水開始水位到達
時間が全開所要時間よりも短い場合には、吐出弁を直ち
に緊急全開させるものである。Further, in the comparison between the pumping start water level reaching time and the full opening required time, if the pumping start water level reaching time at the time of calculation is shorter than the full opening required time, the discharge valve is immediately and fully opened.
[作用] 本発明によれば、吸水井の水位が上昇していくとき、
その水位上昇が水位検知手段によって検出され、その検
出信号に基づいて水位変化率が演算されるとともに、そ
の演算された水位変化率とあらかじめ設定されている揚
水開始水位に基づいて揚水開始水位到達時間が演算さ
れ、続いて、その演算された揚水開始水位到達時間と開
弁手段による吐出弁の全開所要時間とが比較されて、そ
の時点で揚水開始水位到達時間が全開所要時間よりも長
い場合は、吸水井の水位の上昇に伴って漸次減少してい
く揚水開始水位到達時間が全開所要時間と同一になった
時点で開弁手段が起動されて、吐出弁が全開されること
になり、これによって、吸水井の水位が揚水開始水位に
達した時点では吐出弁は全開にされているために、待ち
時間を要することなく、即座に揚水運転して吸水井の水
位の異常上昇による洪水の発生を防止することが可能で
ある。[Operation] According to the present invention, when the water level in the intake well rises,
The rise in the water level is detected by the water level detection means, and the rate of change of the water level is calculated based on the detection signal, and the pumping start water level arrival time is calculated based on the calculated rate of change of the water level and the preset pumping start water level. Then, the calculated pumping start water level reaching time is compared with the time required to fully open the discharge valve by the valve opening means, and if the pumping starting water level reaching time is longer than the full opening required time at that time, , When the pumping start water level reaching time, which gradually decreases as the water level of the intake well rises, becomes equal to the time required for full opening, the valve opening means is activated and the discharge valve is fully opened. Therefore, when the water level of the intake well reaches the pumping start water level, the discharge valve is fully opened. It is possible to prevent the occurrence of water.
また、吸水井にきわめて急激かつ大量の水が流入する
異常事態を発生している場合は、前記揚水開始水位到達
時間と前記全開所要時間との比較時点において揚水開始
水位到達時間が全開所要時間よりも短い場合があり、こ
の場合は前記吐出弁を直ちに緊急全開させることによ
り、吸水井の水位が揚水開始水位に到達した時点からは
僅かに遅れるものの、できる限りの早いタイミングで揚
水運転して吸水井の水位の異常上昇による洪水の発生を
防止することが可能である。In addition, when an abnormal situation occurs where a large amount of water flows into the intake well extremely rapidly, at the time of comparison between the pumping start water level reaching time and the full opening required time, the pumping start water level reaching time is less than the full opening required time. However, in this case, the discharge valve should be immediately fully opened immediately, so that the water level in the suction well may be slightly delayed from the point when it reaches the pumping start water level, but the pumping operation is performed at the earliest possible timing to absorb water. It is possible to prevent the occurrence of floods due to the abnormal rise in the well water level.
[実施例] 以下、本発明の実施例を図面に基づいて説明する。[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.
第1図は本発明の実施例を示す概略構成図であり、前
記第2図の従来例と同一もしくは相当部分には同一符号
を付して、その詳しい説明は省略する。FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention. The same or corresponding parts as those in the conventional example of FIG.
第1図において、先端に羽根車3を固着したポンプ主
軸12は、クラッチ13を介してポンプ駆動用原動機(例え
ばディーゼルエンジン)14の出力軸14Aに連結されてお
り、例えばモータによってなる開閉手段7Aによって開閉
(全開または全閉)される吐出弁7よりも下流の吐出管
8の出口は排水路(例えば河川など)9の水中に臨んで
いる。In FIG. 1, a pump main shaft 12 having an impeller 3 fixed to its tip is connected to an output shaft 14A of a pump driving prime mover (for example, a diesel engine) 14 via a clutch 13, and an opening / closing means 7A composed of, for example, a motor. The outlet of the discharge pipe 8 downstream of the discharge valve 7 that is opened and closed (fully opened or fully closed) by the outlet faces the water in the drainage channel (eg, river) 9.
真空系2は、真空ポンプ20と、この真空ポンプ20の吸
気側とポンプケーシング5における羽根車入口10を連通
させる吸気管24と、この吸気管24に真空ポンプ20側から
直列に介設された弁21および圧力スイッチ23によって構
成されており、真空系2によって水位嵩上げ手段11を構
成している。The vacuum system 2 is provided with a vacuum pump 20, an intake pipe 24 that connects the intake side of the vacuum pump 20 to the impeller inlet 10 of the pump casing 5, and the intake pipe 24 that is connected in series from the vacuum pump 20 side. It is constituted by a valve 21 and a pressure switch 23, and the vacuum system 2 constitutes a water level raising means 11.
水位嵩上げ手段11は、吐出弁7の全閉時は勿論のこ
と、全開時においても吸込管4内の水位(ポンプ内の水
位)を、横軸ポンプが自吸能力で排水可能な満水水位HW
L1まで嵩上げすることのできる機能を有している。The water level raising means 11 is capable of draining the water level in the suction pipe 4 (water level in the pump) not only when the discharge valve 7 is fully closed but also when the discharge valve 7 is fully opened.
It has the function of raising to L1.
具体的には、吐出弁7の全開時において吸込管4内の
水面から排水路9の水中に臨んでいる吐出管8の出口に
かけて形成される一連の密閉空間Aを負圧化し、吸込管
4内の水位を満水水位HWL1まで吸引上昇させることの可
能の真空ポンプ20が真空系2に配置されており、満水水
位HWL1は圧力スイッチ23の圧力検知信号に基づく真空ポ
ンプ20の運転制御により適正に保持される。Specifically, when the discharge valve 7 is fully opened, the series of closed spaces A formed from the water surface in the suction pipe 4 to the outlet of the discharge pipe 8 facing the water in the drainage channel 9 is made negative pressure, and the suction pipe 4 is closed. A vacuum pump 20 capable of suctioning and raising the water level inside to the full water level HWL1 is arranged in the vacuum system 2, and the full water level HWL1 is properly controlled by the operation control of the vacuum pump 20 based on the pressure detection signal of the pressure switch 23. Retained.
吸水井1の水位は水位検出手段15によって検出され、
その検出信号が水位変化率演算回路16に入力され、演算
された水位変化率信号が時間演算回路17に入力される。The water level of the intake well 1 is detected by the water level detecting means 15,
The detection signal is input to the water level change rate calculation circuit 16, and the calculated water level change rate signal is input to the time calculation circuit 17.
時間演算回路17には、吸水井1の揚水開始水位HWLに
相当する水位データがあらかじめ入力されている。した
がって、時間演算回路17では、吸水井1の水位が揚水開
始水位HWLに到達する時間t1を演算してタイマー回路18
に信号を出力し、タイマー回路18は比較回路19に前記t1
を最大値として漸次減少していく時間信号を出力する。Water level data corresponding to the pumping start water level HWL of the intake well 1 is input to the time calculation circuit 17 in advance. Therefore, the time calculation circuit 17 calculates the time t1 at which the water level of the water intake well 1 reaches the pumping start water level HWL, and the timer circuit 18
The timer circuit 18 outputs the signal to
Is output as a maximum value and the time signal is gradually reduced.
比較回路19には、設定器30から吐出弁7の全開所要時
間t2が入力される。The setting circuit 30 inputs the time t2 required for full opening of the discharge valve 7 to the comparison circuit 19.
比較回路19は、前記水位変化率とあらかじめ設定され
た揚水開始吸HWLに基づいて演算された揚水開始水位到
達時間t1の演算時点の値を最大値として吸水弁1の水位
の上昇に伴い漸次減少していく時間信号と吐出弁7の全
開所要時間t2とを比較して、漸次減少していく揚水開始
水位到達時間t1が全開所要時間t2と同一になった時点
で、吐出弁7の全開信号を出力する。つまり、吐出弁7
の開閉手段7Aに開弁信号を出力する。The comparison circuit 19 gradually decreases as the water level of the water intake valve 1 increases with the maximum value at the time of calculation of the pumping start water level arrival time t1 calculated based on the water level change rate and the preset pumping start intake HWL. And the time required for full opening t2 of the discharge valve 7 to be compared, and when the pumping start water level reaching time t1 that gradually decreases becomes equal to the time required for full opening t2, the full open signal of the discharge valve 7 Is output. That is, the discharge valve 7
And outputs a valve opening signal to the opening / closing means 7A.
前記水位変化率演算回路16、時間演算回路17、タイマ
ー回路18、比較回路19および設定器30は1つの制御装置
31に組み込まれている。The water level change rate calculation circuit 16, the time calculation circuit 17, the timer circuit 18, the comparison circuit 19 and the setter 30 are one control device.
Built into 31.
つぎに、前記構成の作動について説明する。 Next, the operation of the above configuration will be described.
横軸ポンプが設置されている吸水井1の水位上昇を水
位検知手段15によって検出し、水位検知手段15の検出信
号に基づいて水位変化率演算回路16により水位変化率を
演算する。The water level rise of the water intake well 1 in which the horizontal axis pump is installed is detected by the water level detection means 15, and the water level change rate calculation circuit 16 calculates the water level change rate based on the detection signal of the water level detection means 15.
演算された水位変化率と予め設定されている揚水開始
水位HWLに基づいて、時間演算回路17により吸水井1の
水位が揚水開始水位HWLに到達する揚水開始水位到達時
間t1が演算され、時間演算回路17からタイマー回路18に
信号が出力される。Based on the calculated water level change rate and the preset pumping start water level HWL, the time calculating circuit 17 calculates the pumping start water level reaching time t1 at which the water level of the water intake well 1 reaches the pumping start water level HWL, and calculates the time. A signal is output from the circuit 17 to the timer circuit 18.
タイマー回路18は、上記のようにして演算された揚水
開始水位到達時間t1の演算時点の値を最大値として吸水
井1の水位の上昇に伴い漸次減少していく時間信号を比
較回路19に出力し、この比較回路19では、設定器30から
入力されている吐出弁7の全開所要時間t2とタイマー回
路18から入力される前述の時間信号とを比較しており、
漸次減少していく揚水開始水位到達時間t1が全開所要時
間t2と同一になった時点で開弁手段7Aが起動させる。The timer circuit 18 outputs to the comparison circuit 19 a time signal that gradually decreases as the water level of the intake well 1 increases, with the value at the time of calculation of the pumping start water level arrival time t1 calculated as described above as the maximum value. The comparison circuit 19 compares the time t2 required for full opening of the discharge valve 7 input from the setting device 30 with the above-mentioned time signal input from the timer circuit 18,
The valve opening means 7A is activated at the time when the pumping start water level reaching time t1 that gradually decreases becomes equal to the full opening required time t2.
一方、吸水井1の水位が揚水開始水位HWLに到達した
時点で、吸込管4内の水位が満水水位HWL1まで嵩上げさ
れるように、水位嵩上げ手段11をあらかじめ作動させて
おく。即ち、ポンプ内を満水水位HWL1まで嵩上げさせて
おく。On the other hand, when the water level of the water intake well 1 reaches the pumping start water level HWL, the water level raising means 11 is operated in advance so that the water level in the suction pipe 4 is raised to the full water level HWL1. That is, the inside of the pump is raised to the full water level HWL1.
その結果、吸水井1の水位が揚水開始水位HWLに到達
した時点で、ポンプ駆動用原動機14によりポンプ主軸12
および羽根車3を回転駆動することで排水が開始され
る。即ち、吸水井1の水位が揚水開始水位HWLに到達し
た時点で、即座に揚水運転(排水運転)がなされる。As a result, when the water level of the intake well 1 reaches the pumping start water level HWL, the pump driving prime mover 14 causes the pump spindle 12
And the drainage is started by rotationally driving the impeller 3. That is, when the water level of the suction well 1 reaches the pumping start water level HWL, the pumping operation (draining operation) is immediately performed.
勿論、吸水井1の水位が揚水開始水位HWLに到達する
前に、ポンプ駆動用原動機14によりポンプ主軸12および
羽根車3を回転駆動して、気中待機運転させてもよい。
また吸水井1の水位が揚水開始水位HWLに到達する前
に、ポンプ駆動用原動機14のみを待機運転させておき、
水位が揚水開始水位HWLに到達した時点でクラッチ13をO
Nしてポンプ主軸12および羽根車3を回転駆動するよう
にしてもよい。Of course, before the water level of the suction well 1 reaches the pumping start water level HWL, the pump driving prime mover 14 may rotate the pump main shaft 12 and the impeller 3 to perform an air standby operation.
Before the water level of the water intake well 1 reaches the pumping start water level HWL, only the pump driving prime mover 14 is put into standby operation,
When the water level reaches the pumping start water level HWL, turn the clutch 13 O
Alternatively, the pump main shaft 12 and the impeller 3 may be rotationally driven.
このように、吸水井1の水位が揚水開始水位HWLに到
達した時点で、即座に揚水運転がなされるの、大量の水
が急激に吸水井1に流入する緊急時であっても、揚水運
転の開始タイミングに遅れを生じないから、吸水井1の
水位の異常上昇による洪水の発生を確実に防止できる。In this way, the pumping operation is performed immediately when the water level of the suction well 1 reaches the pumping start water level HWL. Therefore, even in an emergency when a large amount of water suddenly flows into the suction well 1, the pumping operation is performed. Since there is no delay in the start timing of, the occurrence of flood due to an abnormal rise in the water level of the water intake well 1 can be reliably prevented.
一方、吸水井1にきわめて急激かつ大量の水が流入す
る異常事態を発生している場合は、前記揚水開始水位到
達時間t1の演算時点でその時間t1よりも前記吐出弁7の
全開所定時間t2の方が短い場合があり、この場合は比較
回路19から前記開閉手段7Aに直ちに緊急起動信号Sが出
力されることになり、吸水井1の水位が揚水開始水位HW
Lに到達した時点からは僅かに遅れるものの、吸水井1
の水位が洪水の発生につながるように異常上昇する前の
タイミングで揚水運転することが可能である。On the other hand, if an abnormal situation occurs in which a large amount of water flows into the water intake well 1 extremely rapidly, at the time of calculating the pumping start water level reaching time t1, the discharge valve 7 is fully opened for a predetermined time t2 rather than the time t1. May be shorter, and in this case, the emergency start signal S is immediately output from the comparison circuit 19 to the opening / closing means 7A, and the water level of the intake well 1 is the pumping start water level HW.
Water intake well 1
It is possible to carry out pumping operation at a timing before the water level of the river rises abnormally so as to lead to flooding.
[発明の効果] 本発明は、前述のように構成されているので、つぎに
記載されるような効果を奏する。[Advantages of the Invention] Since the present invention is configured as described above, it has the effects described below.
即ち、吸水井の水位が揚水開始水位に到達した時点
で、即座に揚水運転(排水運転)することができるの
で、大量の水が急激に吸水井に流入する緊急時であって
も、揚水運転の開始タイミングに遅れを生じない。した
がって、吸水井の水位の異常上昇による洪水の発生を確
実に防止できるとともに、吸水井にきわめて急激かつ大
量の水が流入する異常事態を生じたとしても、水位が揚
水開始水位に到達した時点から僅かに遅れたタイミング
で揚水運転することができるので、吸水井の水位の異常
上昇による洪水の発生を防止でき、緊急時における適正
排水が可能になり、排水機場の信頼性を向上させること
ができる。In other words, the pumping operation (drainage operation) can be performed immediately when the water level of the intake well reaches the pumping start water level, so even in an emergency when a large amount of water suddenly flows into the intake well There is no delay in the start timing of. Therefore, it is possible to reliably prevent the occurrence of flooding due to an abnormal rise in the water level in the intake well, and even if an abnormal situation occurs where a large amount of water flows into the intake well very rapidly, from the time when the water level reaches the pumping start water level. Since the pumping operation can be performed at a slightly delayed timing, it is possible to prevent the occurrence of flooding due to an abnormal rise in the water level of the intake well, enable proper drainage in an emergency, and improve the reliability of the drainage pump station. .
第1図は本発明の実施例を示す概略構成図、第2図は従
来例の概略構成図である。 1……吸水井 7……吐出弁 7A……吐出弁の開閉手段 15……水位検出手段 HWL……揚水開始水位FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of a conventional example. 1 …… Suction well 7 …… Discharge valve 7A …… Discharge valve opening / closing means 15 …… Water level detection means HWL …… Water pumping start water level
Claims (2)
上昇を水位検知手段によって検出し、この水位検知手段
の検出信号に基づいて水位変化率を演算し、その演算さ
れた水位変化率とあらかじめ設定されている揚水開始水
位に基づいて吸水井の水位が揚水開始水位に到達する揚
水開始水位到達時間を演算し、その演算された揚水開始
水位到達時間と吐出弁の全開所要時間とを比較して、演
算時点における揚水開始水位到達時間が前記全開所要時
間よりも長い場合は、吸水井の水位の上昇に伴って漸次
減少していく揚水開始水位到達時間が全開所要時間と同
一になった時点で開弁手段を起動させて、吐出弁を全開
させるように制御することを特徴とする横軸ポンプの運
転方法。1. A water level rise in an intake well in which a horizontal axis pump is installed is detected by a water level detection means, and a water level change rate is calculated based on a detection signal of this water level detection means, and the calculated water level change rate. Based on the pumping start water level set in advance, the pumping start water level arrival time at which the water level of the suction well reaches the pumping start water level is calculated, and the calculated pumping start water level arrival time and the time required to fully open the discharge valve are calculated. In comparison, if the pumping start water level arrival time at the time of calculation is longer than the full opening required time, the pumping start water level reaching time that gradually decreases as the water level of the intake well rises becomes the same as the full opening required time. A method for operating a horizontal axis pump, characterized in that the valve opening means is activated at that time to control the discharge valve to be fully opened.
時間との比較において、演算時点における揚水開始水位
到達時間が全開所要時間よりも短い場合には、吐出弁を
直ちに緊急全開させる請求項(1)記載の横軸ポンプの
運転方法。2. The discharge valve is immediately and fully opened when the pumping start water level reaching time and the full opening required time are compared with each other when the pumping start water level reaching time at the time of calculation is shorter than the full opening required time. 1) The method for operating the horizontal shaft pump described above.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26763990A JP2673741B2 (en) | 1990-10-04 | 1990-10-04 | Operation method of horizontal axis pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26763990A JP2673741B2 (en) | 1990-10-04 | 1990-10-04 | Operation method of horizontal axis pump |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04143497A JPH04143497A (en) | 1992-05-18 |
JP2673741B2 true JP2673741B2 (en) | 1997-11-05 |
Family
ID=17447468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP26763990A Expired - Fee Related JP2673741B2 (en) | 1990-10-04 | 1990-10-04 | Operation method of horizontal axis pump |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2673741B2 (en) |
-
1990
- 1990-10-04 JP JP26763990A patent/JP2673741B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH04143497A (en) | 1992-05-18 |
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