JPH04116292A - Operating method for horizontal shaft pump - Google Patents
Operating method for horizontal shaft pumpInfo
- Publication number
- JPH04116292A JPH04116292A JP23494890A JP23494890A JPH04116292A JP H04116292 A JPH04116292 A JP H04116292A JP 23494890 A JP23494890 A JP 23494890A JP 23494890 A JP23494890 A JP 23494890A JP H04116292 A JPH04116292 A JP H04116292A
- Authority
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- Prior art keywords
- water level
- water
- pump
- pumping
- reaches
- 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.)
- Pending
Links
- 238000011017 operating method Methods 0.000 title description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 258
- 238000005086 pumping Methods 0.000 claims abstract description 72
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 abstract description 10
- 230000002159 abnormal effect Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000007257 malfunction Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 235000020681 well water Nutrition 0.000 description 2
- 239000002349 well water Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Control Of Non-Positive-Displacement Pumps (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
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。[Detailed description of the invention] [Industrial application field] The present invention relates to a method of operating a horizontal shaft pump.
[従来の技術]
従来より、第4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
HWL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
ポンプを運転(羽根車3を回転)させ、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] Conventionally, in the suction type horizontal shaft pump installed in the pump suction well 1 of the drainage pump station shown in Fig. 4, when the water level in the suction well 1 reaches the pumping start water level HWL, This water level HWL is detected by the pressure switch 23 of the vacuum system 2 or a water level detection means (not shown), and the vacuum pump 20 is started based on this detection signal, and the suction pipe 4 disposed upstream of the impeller 3 The water in the suction pipe 4 is sucked up to the level that reaches the impeller 3 in the pump casing 5, that is, the full water level, and after this state is detected by the full water detector 6, a full water detection signal is generated. The pump is operated (the impeller 3 is rotated) based on the discharge valve 7.
An operating method is adopted in which the pump is fully opened for 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、真空ポンプ20を
起動して吸込管4の内部を高負圧化しポンプケーシング
5内を満水にするのに時間がかかる上、ポンプ起動後に
吐出弁7を全開操作するため、実際に排水されるまでに
時間がかかるしたがって、吸水井1の水位が揚水開始水
位HWLに到達してから、排水運転が開始されるまでに
比較的長い時間(約lO分程度)を必要としている。[Problems to be Solved by the Invention] However, in the conventional operating method, after the water level in the water suction well 1 reaches the pumping start water level HWL, the vacuum pump 20 is started to create a high negative pressure inside the suction pipe 4. It takes time to fill the inside of the pump casing 5 with water, and since the discharge valve 7 is fully opened after the pump is started, it takes time for the water to actually drain. It takes a relatively long time (approximately 10 minutes) from the time the water reaches the water to the start of the drainage operation.
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に流入す事態を生じ易い。On the other hand, in recent years, the water retention function of geological formations has been declining due to an increase in paving ratio and a decrease in green areas due to the progress of urbanization. Moreover, since the amount of water flowing into the water absorption well 1 tends to increase, a situation in which a large amount of water suddenly flows into the water absorption well 1, such as a so-called flash flood, is likely to occur.
しかし、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、比較的長い時間が必要であるか
ら、大量の水が急激に吸水井l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 shaft pump operation method, a relatively long time is required between the water level in the water intake well 1 reaching the pumping start water level HWL and the pumping operation starting. In an emergency when water suddenly flows into the water intake well l, 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。As described above, if the start timing of the pumping operation is delayed, the water level in the water intake well 1 may rise abnormally, leading to a flood.
また、ポンプ本体や駆動系あるいは真空系2および吐出
弁7などに故障が発生していたとしても、吸水井lの水
位が揚水開始水位HWLに到達した揚水(排水)の必要
な時点から所定時間を経過するまで、前記の故障を確認
できない、そのために、緊急時において適正に排水させ
ることができないこともある。In addition, even if a failure occurs in the pump body, drive system, vacuum system 2, discharge valve 7, etc., a predetermined period of time will elapse after the water level in the suction well l reaches the pumping start water level HWL and water pumping (drainage) is required. The above-mentioned failure cannot be confirmed until the period has passed, and therefore, it may not be possible to properly drain the water in an emergency.
本発明は、このような事情に鑑みなされたもので、吸水
井の水位に関係なく全速運転させることで、突発的な水
位の上昇に対処し得る待機運転を可能にして、水位の異
常上昇による洪水の発生を防止するとともに、水位の異
常低下によるポンプ運転機能障害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 was developed in view of the above circumstances, and by operating at full speed regardless of the water level of the water intake well, it is possible to perform standby operation that can cope with sudden increases in water level, and to prevent abnormal rises in water level. The object of the present invention is to provide a method of operating a horizontal shaft pump that can prevent the occurrence of flooding and also prevent the occurrence of pump operation malfunctions due to an abnormal drop in water level.
[課題を解決するための手段〕
前記目的を達成するために、本発明に係る第1の発明は
、横軸ポンプを設置している吸水井が最低水位から揚水
開始水位に到達する直前までの間は、水位嵩上げ手段の
作動により羽根車上流吸込管内の水位を前記吸水井の水
位よりも揚水開始水位から横軸ポンプが自吸能力で排水
可能な水位までの高さに相当して嵩上げするとともに、
ポンプ吐出弁を開弁して気中運転を行い、吸水井の水位
が揚水開始水位到達時に自動的に揚水運転するようにし
たものである。[Means for Solving the Problems] In order to achieve the above-mentioned object, the first invention according to the present invention provides a water suction well in which a horizontal shaft pump is installed, from the lowest water level to just before reaching the pumping start water level. During this period, the water level in the suction pipe upstream of the impeller is raised by the operation of the water level raising means to a height corresponding to the height from the pumping start water level to the water level at which the horizontal axis pump can drain water with its self-priming capacity, above the water level in the water suction well. With,
The pump discharge valve is opened to perform submerged operation, and pumping operation is automatically started when the water level in the water intake well reaches the pumping start water level.
また、本発明に係る第2の発明は、横軸ポンプを設置し
ている吸水井が最低水位から揚水開始水位に到達する直
前までの間は、水位嵩上げ手段の作動により羽根車上流
吸込管内の水位を前記吸水井の水位よりも揚水開始水位
から横軸ポンプが自吸能力で排水可能な水位までの高さ
に相当して嵩上げするとともに、ポンプ吐出弁を開弁し
て気中運転を行い、吸水井の水位が揚水開始水位到達時
に自動的に揚水運転し、吸水井が最低水位未満に低下し
たとき揚水遮断手段の開成により羽根車入口に空気を導
入して気中運転に切替えるようにしたものである。Further, in the second aspect of the present invention, the water level in the suction pipe upstream of the impeller is activated by the operation of the water level raising means until the water suction well in which the horizontal shaft pump is installed reaches the pumping start water level from the lowest water level. The water level is raised above the water level in the suction well by an amount corresponding to the height from the pumping start water level to the water level at which the horizontal shaft pump can drain water with its self-priming capacity, and the pump discharge valve is opened to perform submerged operation. Pumping operation is automatically started when the water level in the water intake well reaches the pumping start water level, and when the water intake well drops below the minimum water level, air is introduced into the impeller inlet by opening the pumping cutoff means and the system switches to air operation. This is what I did.
[作用]
本発明に係る第1の発明によれば、吸水井の水位が最低
水位から揚水開始水位に到達する直前までの間は、水位
嵩上げ手段の作動により羽根車上流吸込管内の水位を前
記吸水井の水位よりも揚水開始水位から横軸ポンプが自
吸能力で排水可能な水位までの高さに相当して嵩上げす
るとともに、ポンプ吐出弁を開弁して全速待機運転を行
う。[Operation] According to the first aspect of the present invention, immediately before the water level of the water suction well reaches the pumping start water level from the lowest water level, the water level in the suction pipe upstream of the impeller is raised by the operation of the water level raising means. The water level in the water suction well is raised to a level corresponding to the height from the pumping start water level to the water level at which the horizontal shaft pump can drain water with its self-priming capacity, and the pump discharge valve is opened to perform full-speed standby operation.
この状態で吸水井の水位が揚水開始水位に到達すると、
吸込管内の水位は水位嵩上げ手段により横軸ポンプが自
吸能力で排水可能な水位まで嵩上げされることになる。In this state, when the water level in the water intake well reaches the pumping start water level,
The water level in the suction pipe is raised by the water level raising means to a level at which the horizontal shaft pump can drain water with its self-priming ability.
したがって、この時点で自動的に揚水運転に切替えるこ
とができる。つまり、吸水井の水位が揚水開始水位に到
達した時点で、即座に気中運転から揚水運転に切替える
ことができる。Therefore, at this point, it is possible to automatically switch to pumping operation. In other words, when the water level in the water intake well reaches the pumping start water level, it is possible to immediately switch from submerged operation to pumping operation.
本発明に係る第2の発明によれば、吸水井の水位が最低
水位から揚水開始水位に到達する直前までの間は、水位
素上げ手段の作動により羽根車上流吸込管内の水位を前
記吸水井の水位よりも揚水開始水位から横軸ポンプが自
吸能力で排水可能な水位までの高さに相当して嵩上げす
るとともに、ポンプ吐出弁を開弁して全速待機運転を行
う。According to the second aspect of the present invention, the water level in the suction pipe upstream of the impeller is raised by the operation of the water level raising means until the water level in the water suction well reaches the pumping start water level from the lowest water level. The water level is increased from the pumping start water level to the water level at which the horizontal axis pump can drain water with its self-priming capacity, and the pump discharge valve is opened to perform full-speed standby operation.
この状態で吸水井の水位が揚水開始水位に到達すると、
吸込管内の水位は水位素上げ手段により横軸ポンプが自
吸能力で排水可能な水位まで嵩上げされることになる。In this state, when the water level in the water intake well reaches the pumping start water level,
The water level in the suction pipe is raised by the water level raising means to a level at which the horizontal shaft pump can drain water with its self-priming ability.
したがって、この時点で自動的に揚水運転に切替えるこ
とができる。つまり、吸水井の水位が揚水開始水位に到
達した時点で、即座に気中運転から揚水運転に切替える
ことができる。Therefore, at this point, it is possible to automatically switch to pumping operation. In other words, when the water level in the water intake well reaches the pumping start water level, it is possible to immediately switch from submerged operation to pumping operation.
そして、揚水運転により吸水井の水位が最低水位よりも
下位に低下したとき揚水遮断手段を開成する。その結果
、羽根車入口に空気が導入されて気中運転に切替えるこ
とができる。Then, when the water level in the water intake well falls below the lowest water level due to the pumping operation, the pumping cutoff means is opened. As a result, air is introduced into the impeller inlet and the operation can be switched to air operation.
[実施例] 以下1本発明の実施例を図面に基づいて説明する。[Example] An embodiment of the present invention will be described below based on the drawings.
第1図は第1実施例の概略構成図であり、前記第4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 of the first embodiment, and the same or equivalent parts as in the conventional example shown in FIG. 4 are denoted by the same reference numerals.
A detailed explanation thereof will be omitted.
第1図において、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・
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v24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によって水位素
上げ手段11を構成している。In FIG. 1, the outlet of the discharge pipe 8 downstream of the discharge valve 7 faces the water of a drainage channel (for example, a river) 9. The vacuum system 2 includes a vacuum pump 20 and the suction side of this vacuum pump 20. It is composed of an intake pipe 24 that communicates with the impeller inlet 10 of the pump casing 5, and a valve 21 and a pressure switch 23 that are connected in series to this intake air v24 from the vacuum pump 20 side. It constitutes a lifting means 11.
水位素上げ手段11は、吐出弁7の全開時において吸込
管4内の水位IWLを、吸水井1の水位よりもH2分だ
け嵩上げできる機能を有している、つまり、揚水開始水
位HWLから横軸ポンプが自吸能力で排水可能な水位ま
での高さH2に相当して吸込管4内の水位IWLを嵩上
げすることができる。The water level raising means 11 has a function of raising the water level IWL in the suction pipe 4 by H2 above the water level in the suction well 1 when the discharge valve 7 is fully opened. The water level IWL in the suction pipe 4 can be raised to correspond to the height H2 up to the water level at which the axial pump can drain water with its self-priming ability.
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12を負圧化し、吸込管
4内の水位IWLを吸水井lの水位よりもH2分だけ吸
引上昇させることの可能な真空ポンプ20が真空系2に
配置されており、水位IWLの嵩上げ量H2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, a series of sealed spaces 12 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 are made negative pressure, and the suction pipe 4 is A vacuum pump 20 capable of suctioning and raising the water level IWL in the suction well l by an amount H2 above the water level in the water suction well l is disposed in the vacuum system 2. The vacuum pump 20 is properly maintained by controlling the operation of the vacuum pump 20 based on the above.
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 explained.
■、吸水井lの水位が最低水位LWLの下位から最低氷
位LWLに到達すると、この水位LWLを図示されてい
ない水位検出手段によって検出し、水位検出手段の水位
検出信号に基づいて真空ポンプ20を起動させ、弁21
を開弁させる。つまり水位素上げ手段11を作動させる
。(2) When the water level of the water intake well l reaches the lowest ice level LWL from below the lowest water level LWL, this water level LWL is detected by a water level detection means (not shown), and the vacuum pump 20 is activated based on the water level detection signal of the water level detection means. and valve 21.
Open the valve. In other words, the water level raising means 11 is activated.
同時に、前記水位検出信号に基づいて吐出弁7を全開さ
せてポンプを起動し全速気中運転、つまり全速待機運転
を行う。At the same time, based on the water level detection signal, the discharge valve 7 is fully opened and the pump is started to perform full-speed atmospheric operation, that is, full-speed standby operation.
■、前記■の水位素上げ手段11の作動により、吸込管
4内の水位IWLが吸水井1の水位LWLよりもH2だ
け嵩上げされる(第2A図参照)■、吸水井lの水位が
揚水開始水位HWLに到達する直前までの間は、水位素
上げ手段11の作動により吸込ee4内の水位IWLを
吸水井1の水位よりもH2に相当して嵩上げした状態で
、全速待機運転が行われる。(2) By the operation of the water level raising means 11 in (2) above, the water level IWL in the suction pipe 4 is raised by H2 above the water level LWL in the water intake well 1 (see Figure 2A). Immediately before reaching the start water level HWL, full-speed standby operation is performed with the water level IWL in the suction ee4 raised by the operation of the water level raising means 11 to a level corresponding to H2 higher than the water level in the water suction well 1. .
■、吸水井lの水位が揚水開始水位HWLに到達すると
、吸込管l内の水位はこれよりもH2だけ高いレベル、
つまり横軸ポンプが自吸能力で排水可能な水位まで嵩上
げされることになる(第2B図参照)、即ち、吸水井l
の水位が揚水開始水位HWLに到達した時点で、即座に
気中運転から揚水運転に切替えられる。■When the water level in the suction well l reaches the pumping start water level HWL, the water level in the suction pipe l is at a level H2 higher than this level,
In other words, the water level of the horizontal shaft pump is raised to the level at which water can be drained with its self-priming capacity (see Figure 2B).
When the water level reaches the pumping start water level HWL, the submerged operation is immediately switched to the pumping operation.
このように、吸水井l水位が揚水開始水位HWLに到達
した時点で、即座に気中運転から揚水運転に切替えられ
るので、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, when the water level in the water intake well 1 reaches the pumping start water level HWL, the operation is immediately switched from submerged operation to pumping operation, so even in an emergency when a large amount of water suddenly flows into the water intake well 1, Since there is no delay in the start timing of the pumping operation, it is possible to reliably prevent flooding due to an abnormal rise in the water level of the water intake well 1.
また、ポンプ本体や駆動系あるいは真空系2および吐出
弁7などに、万一、故障が発生していたとしても、吸水
井1の水位が最低水位LWLに到達した時点で故障を確
認してこれに対処することができるので、緊急時にける
適正排水が可能になり、排水機場の信頼性を向上させる
ことができる前記故障の確認は、前記■の作動を最低水
位LWL未渦の水位で行うことにより、さらに早い時点
で行うことも可能である。In addition, even if a failure occurs in the pump body, drive system, vacuum system 2, discharge valve 7, etc., the failure can be confirmed and corrected when the water level in the water intake well 1 reaches the lowest water level LWL. This enables proper drainage in emergencies and improves the reliability of the drainage pump station.To confirm the above-mentioned failure, perform the operation in (①) above at the lowest water level LWL with no vortex. It is also possible to do this at an earlier point in time.
第3図は第2実施例の概略構成図であり、この実施例で
は、下部開放端を吸水井lの最低水位LWLと同じレベ
ルに設定し、かつ上部開放端を羽根車入口10に開口し
た管によってなる揚水遮断手段13が付設されている。FIG. 3 is a schematic configuration diagram of the second embodiment. In this embodiment, the lower open end is set at the same level as the lowest water level LWL of the water intake well 1, and the upper open end is opened to the impeller inlet 10. A water pumping cutoff means 13 consisting of a pipe is attached.
このような構成であれば、吸水井lの水位が最低水位L
WLの下位から上昇する場合には、前述の■ないし■と
同じ作用によって同様に運転されるとともに、揚水運転
のIt1続により吸水井lの水位が揚水開始水位HWL
またはそれ以上の高水位から最低水位LWLまで低下し
ている間も、揚水運転がなされる。With such a configuration, the water level of water absorption well L is the lowest water level L
When rising from the lower level of WL, the operation is performed in the same manner as in the above-mentioned ■ to ■, and the water level of the water intake well l is brought up to the pumping start water level HWL by the It1 sequence of pumping operation.
Pumping operation is also performed while the water level is lowering from a higher water level to the lowest water level LWL.
そして、吸水井1の水位が最低水位LWLよりも下位に
低下して、揚水遮断手段13の下部開放端の水没状態が
解除されると、ここから羽根車入口10に空気が導入さ
れることになり、揚水を遮断した全速気中運転(全速待
機運転)に切替えられる。したがって、ポンプを停止す
ることなく吸水井lの水位の異常低下による渦吸込に起
因するポンプ運転機能障害の発生を確実に防止すること
もできる。Then, when the water level of the water intake well 1 falls below the lowest water level LWL and the submerged state of the lower open end of the water pumping cutoff means 13 is released, air is introduced into the impeller inlet 10 from here. The system is switched to full-speed atmospheric operation (full-speed standby operation) with water pumping cut off. Therefore, without stopping the pump, it is also possible to reliably prevent the occurrence of pump operation malfunction due to vortex suction due to an abnormal drop in the water level of the water intake well I.
前記各実施例では、真空系2によって水位嵩上げ手段1
1を構成して説明しているが、本発明は前記実施例にの
み限定されるものではなく、吸水井1を気密に構成して
おくとともに、圧力スイッチ23の圧力検知信号に基づ
いて設定される値の高圧を、第1図および第3図におい
て複数の矢印Pで示すように、吸水井1内の水面に負荷
させることのできる圧縮空気供給系(図示省略)によっ
て水位嵩上げ手段11を構成してもよい。In each of the above embodiments, the water level raising means 1 is
1 has been described, the present invention is not limited only to the above-mentioned embodiment, but the present invention is not limited to the above-mentioned embodiment. The water level raising means 11 is constituted by a compressed air supply system (not shown) that can apply a high pressure of a value to the water surface in the water absorption well 1, as shown by a plurality of arrows P in FIGS. 1 and 3. You may.
また、前記第2実施例では、下部開放端を吸水井lの最
低水位LWLと同じレベルに設定し、かつ上部開放端を
羽根車入口lOに開口した管によって、揚水遮断手段1
3を構成して説明しているが、この揚水遮断手段13も
実施例にのみ限定されるものではなく、ポンプケーシン
グ5を貫通して羽根車入口10を大気と連通または遮断
させる弁(図示省略)を取付け、この弁を例えば図示さ
れていない水位検出手段による水位検出信号に基づいて
開閉制御するような構成としてもよい。In addition, in the second embodiment, the pumping cutoff means 1 is constructed by a pipe whose lower open end is set at the same level as the lowest water level LWL of the water intake well l, and whose upper open end is opened to the impeller inlet lO.
3, this pumping cutoff means 13 is not limited to the embodiment, but may also include a valve (not shown) that penetrates the pump casing 5 and communicates or cuts off the impeller inlet 10 with the atmosphere. ), and the opening and closing of this valve may be controlled based on, for example, a water level detection signal from a water level detection means (not shown).
[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。[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.
即ち、請求項(1)に記載の横軸ポンプの運転方法によ
れば、吸水井水位が揚水開始水位に到達した時点で、即
座に気中運転(全速待機運転)から揚水運転(全速排水
運転)に切替えられるので、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
に遅れを生じないから、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、ポンプ本体や
駆動系あるいは真空系および吐出弁などに、万一、故障
が発生していたとしても、吸水井の水位が揚水開始水位
に到達する以前に故障を確認してこれに対処することが
できるので、緊急時における適正排水が可使になり、排
水機場の信頼性を向上させることができる。That is, according to the operating method of the horizontal shaft pump according to claim (1), when the water intake well water level reaches the pumping start water level, the pumping operation (full speed drainage operation) is immediately changed from the submerged operation (full speed standby operation) to the pumping operation (full speed drain operation). ), even in an emergency when a large amount of water suddenly flows into the water intake well, there will be no delay in the start of pumping operation, ensuring that flooding will not occur due to an abnormal rise in the water level in the water intake well. In addition, even if a failure occurs in the pump body, drive system, vacuum system, or discharge valve, the failure can be detected and corrected before the water level in the suction well reaches the pumping start water level. Since it is possible to deal with this problem, proper drainage can be used in an emergency, and the reliability of the drainage pump station can be improved.
また、請求項(2)に記載の横軸ポンプの運転方法によ
れば、吸水井水位が揚水開始水位に到達した時点で、即
座に気中運転(全速待機運転)から揚水運転(全速排水
運転)に切替えられるので、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
に遅れを生じないから、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、ポンプ本体や
駆動系あるいは真空系および吐出弁などに、万一、故障
が発生していたとしても、吸水井の水位が揚水開始水位
に到達する以前に故障を確認してこれに対処することが
できるので、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。Further, according to the method of operating the horizontal shaft pump according to claim (2), when the water intake well water level reaches the pumping start water level, the pumping operation (full speed drainage operation) is immediately changed from the submerged operation (full speed standby operation) to the pumping operation (full speed drainage operation). ), even in an emergency when a large amount of water suddenly flows into the water intake well, there will be no delay in the start of pumping operation, ensuring that flooding will not occur due to an abnormal rise in the water level in the water intake well. In addition, even if a failure occurs in the pump body, drive system, vacuum system, or discharge valve, the failure can be detected and corrected before the water level in the suction well reaches the pumping start water level. Since the problem can be dealt with properly, proper drainage can be performed in an emergency, and the reliability of the drainage pump station can be improved.
しかも、吸水井の水位が最低水位よりも下位に低下した
とき揚水遮断手段によって気中運転に切替えることがで
きるので、吸水井の水位の異常低下によるポンプ運転機
能障害の発生を確実に防止することが可能になる。Furthermore, when the water level in the suction well drops below the lowest water level, the pumping cutoff means can switch to submerged operation, thereby reliably preventing the occurrence of pump operation malfunctions due to an abnormal drop in the water level in the suction well. becomes possible.
第1図は本発明に係る第1実施例の概略構成図、第2A
図および第2B図は吸水井の水位と吸込管内の水位との
関係を示す説明図、第3図は本発明に係る第2実施例の
概略構成図、第4図は従来例の概略構成図である。
l・・・吸水井
3・・・羽根車
4・・・吸込管
7・・・吐出弁
10・・・羽根車入口
11・・・水位素上げ手段
13・・・揚水遮断手段
HWL・・・揚水開始水位
LWL・・・最低水位
IWL・・・吸込管内の水位
H2・・・揚水開始水位から横軸ポンプが自吸能力で排
水可能な水位まで
の高さ(嵩上げ量)FIG. 1 is a schematic configuration diagram of the first embodiment according to the present invention, and FIG.
2B and 2B are explanatory diagrams showing the relationship between the water level in the suction well and the water level in the suction pipe, FIG. 3 is a schematic diagram of the second embodiment of the present invention, and FIG. 4 is a schematic diagram of the conventional example. It is. l...Suction well 3...Impeller 4...Suction pipe 7...Discharge valve 10...Impeller inlet 11...Water level raising means 13...Pumping cutoff means HWL... Pumping start water level LWL...Minimum water level IWL...Water level in the suction pipe H2...Height from the pumping start water level to the water level at which the horizontal axis pump can drain water with its self-priming capacity (amount of elevation)
Claims (2)
揚水開始水位に到達する直前までの間は、水位嵩上げ手
段の作動により羽根車上流吸込管内の水位を前記吸水井
の水位よりも揚水開始水位から横軸ポンプが自吸能力で
排水可能な水位までの高さに相当して嵩上げするととも
に、ポンプ吐出弁を開弁して気中運転を行い、吸水井の
水位が揚水開始水位到達時に自動的に揚水運転すること
を特徴とする横軸ポンプの運転方法。(1) From the lowest water level to just before the water suction well where the horizontal shaft pump is installed reaches the pumping start water level, the water level raising means is operated to raise the water level in the suction pipe upstream of the impeller to be higher than the water level in the water suction well. The water level is raised from the pumping start water level to the water level at which the horizontal shaft pump can drain water with its self-priming capacity, and the pump discharge valve is opened for air operation, so that the water level in the suction well reaches the pumping start water level. A method of operating a horizontal shaft pump, which is characterized in that it automatically starts pumping operation when the pump reaches the point where the water reaches the pump.
揚水開始水位に到達する直前までの間は、水位嵩上げ手
段の作動により羽根車上流吸込管内の水位を前記吸水井
の水位よりも揚水開始水位から横軸ポンプが自吸能力で
排水可能な水位までの高さに相当して嵩上げするととも
に、ポンプ吐出弁を開弁して気中運転を行い、吸水井の
水位が揚水開始水位到達時に自動的に揚水運転し、吸水
井の水位が最低水位よりも下位に低下したとき揚水遮断
手段の開成により羽根車入口に空気を導入して気中運転
に切替えることを特徴とする横軸ポンプの運転方法。(2) From the lowest water level to just before the water intake well where the horizontal shaft pump is installed reaches the pumping start water level, the water level raising means is operated to raise the water level in the suction pipe upstream of the impeller to be higher than the water level in the water intake well. The water level is raised from the pumping start water level to the water level at which the horizontal shaft pump can drain water with its self-priming capacity, and the pump discharge valve is opened for air operation, so that the water level in the suction well reaches the pumping start water level. The horizontal shaft is characterized in that pumping operation is automatically performed when the water level reaches the minimum water level, and when the water level of the water intake well falls below the minimum water level, air is introduced into the impeller inlet by opening the pumping cutoff means and switching to air operation is performed. How to operate the pump.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23494890A JPH04116292A (en) | 1990-09-04 | 1990-09-04 | Operating method for horizontal shaft pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23494890A JPH04116292A (en) | 1990-09-04 | 1990-09-04 | Operating method for horizontal shaft pump |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04116292A true JPH04116292A (en) | 1992-04-16 |
Family
ID=16978772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23494890A Pending JPH04116292A (en) | 1990-09-04 | 1990-09-04 | Operating method for horizontal shaft pump |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04116292A (en) |
-
1990
- 1990-09-04 JP JP23494890A patent/JPH04116292A/en active Pending
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