JPH0385391A - Vertical shaft pump - Google Patents
Vertical shaft pumpInfo
- Publication number
- JPH0385391A JPH0385391A JP21994089A JP21994089A JPH0385391A JP H0385391 A JPH0385391 A JP H0385391A JP 21994089 A JP21994089 A JP 21994089A JP 21994089 A JP21994089 A JP 21994089A JP H0385391 A JPH0385391 A JP H0385391A
- Authority
- JP
- Japan
- Prior art keywords
- air
- air introduction
- branch pipe
- pipe
- vertical shaft
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 148
- 238000005086 pumping Methods 0.000 claims abstract description 50
- 230000000630 rising effect Effects 0.000 claims description 7
- 238000007789 sealing Methods 0.000 abstract description 8
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000004064 dysfunction Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- 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、水位に関係なく全速運転を行わせることが可
能な立軸ポンプに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vertical shaft pump that can be operated at full speed regardless of the water level.
［従来の技術］
従来より排水機場のポンプの吸水井などに設置されてい
る一般的な立軸ポンプには、水位が一定のレベルより低
いと立軸ポンプの吸込口が水中にあるにもかかわらず渦
を生じて空気混じりの水を吸い込むといったポンプ特有
の最低水位（運転可能最低水位）が存在し、水位がこの
最低水位以上に達していないときに運転を行うと振動や
騒音などを生じるという特性がある。[Conventional technology] Conventional vertical shaft pumps, which are conventionally installed in water intake wells of pumps at drainage pump stations, have a tendency to generate vortices when the water level is lower than a certain level, even though the vertical shaft pump's suction port is underwater. There is a minimum water level (minimum operable water level) unique to pumps, which causes water to suck air mixed with air, and if operated when the water level has not reached this minimum water level, vibrations and noise will be generated. be.
したがって、このような立軸ポンプを水位に関係なく全
速で運転して不慮の出水などのために待機運転させてお
くと（全速待機運転）、水位が上記最低水位以下になっ
たとき、激しい振動や騒音が発生してポンプ運転機能障
害を引き起こしたり、基礎や建屋の損傷を引き起こした
りすることがある。Therefore, if such a vertical shaft pump is operated at full speed regardless of the water level and kept in standby mode in case of unexpected water outflow (full speed standby operation), when the water level falls below the above minimum water level, severe vibrations and Noise may be generated, causing pump operation dysfunction and damage to foundations and buildings.
そこで、従来の立軸ポンプでは、全速待機運転を行わず
、水位が最低水位よりも高いときのみ運転を行い、水位
が最低水位より低いときには運転を停止するといった運
転システムが採用されていた。Therefore, conventional vertical shaft pumps have adopted an operating system that does not perform full-speed standby operation, but operates only when the water level is higher than the minimum water level, and stops operation when the water level is lower than the minimum water level.
ところが、近年では、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保水機能が低下している一方で
、上記吸水井などへの流入水量は増大する傾向が顕著に
現れ、しかも鉄砲水のように突発的に大量の水が吸水井
に流入することも多々生じている。そのため、吸水井な
どでは水位が短時間で変動し、従来の立軸ポンプによる
運転システムでは立軸ポンプの運転開始タイミングや運
転停止タイミングを的確に制御することが難しく、水位
の異常上昇による洪水や異常低下によるポンプ運転機能
障害といった事態を引き起こす懸念があった。However, in recent years, while the water retention function has been declining due to an increase in paving ratio and a decrease in green areas due to the progress of urbanization, there has been a noticeable tendency for the amount of water flowing into the water intake wells mentioned above to increase, and moreover, flash floods are occurring. It often happens that a large amount of water suddenly flows into the water intake well. As a result, the water level in water intake wells fluctuates over a short period of time, and with conventional vertical shaft pump operation systems, it is difficult to accurately control the timing of starting and stopping the operation of the vertical shaft pump, resulting in flooding and abnormal water drop caused by abnormal rise in water level. There was a concern that this could cause problems such as pump operation dysfunction.
そこで、本願出願人は特願昭６１−２８０９６７号に、
水位が最低水位より高いか低いかに関係なく安定した全
速待機運転を行うことが可能な立軸ポンプを提案した。Therefore, the applicant of this application filed Japanese Patent Application No. 61-280967.
We proposed a vertical shaft pump that can perform stable full-speed standby operation regardless of whether the water level is higher or lower than the minimum water level.
即ち、この立軸ポンプは、第３図に示すように、ポンプ
羽根車１の前方（上流側）の吸込みケーシング２にその
吸込口よりもはるかに径小でかっ他端が大気中に開放さ
れた分岐管３を連通接続させると共に、この分岐管３の
上部に電動吸気弁４を介在し、この電動吸気弁４を水位
検出計５からの信号によって開閉制御するようにしたも
ので、吸水井Ｐの水位が上記最低水位よりも下位から上
昇している場合において、水位検出計５により水位が上
記最低水位に達していないことが検出されている間は電
動吸気弁４が開いており、水位検出計５により吸水井Ｐ
の水位が上記最低水位に達していることが検出されると
電動吸気弁４が閉じるように制御され、水位が上記最低
水位に達するまでは分岐管３から羽根車室６に空気が吸
入されて揚水は行われず、所謂気中での全速運転が行わ
れる。That is, as shown in Fig. 3, this vertical shaft pump has a suction casing 2 in front (upstream side) of the pump impeller 1 with a diameter much smaller than the suction port, and the other end is open to the atmosphere. The branch pipe 3 is connected in communication, and an electric intake valve 4 is interposed at the upper part of the branch pipe 3, and the electric intake valve 4 is controlled to open and close by a signal from a water level detector 5. When the water level is rising from below the minimum water level, the electric intake valve 4 is open while the water level detector 5 detects that the water level has not reached the minimum water level, and the water level is not detected. Water absorption well P due to total 5
When it is detected that the water level has reached the minimum water level, the electric intake valve 4 is controlled to close, and air is sucked into the impeller chamber 6 from the branch pipe 3 until the water level reaches the minimum water level. There is no pumping of water, and full-speed operation is performed in so-called air.
水位が上記最低水位に達した後には分岐管３からの羽根
車室６への空気吸入が停止されて揚水が行われ、通常の
揚水運転が行われる。After the water level reaches the minimum water level, air intake from the branch pipe 3 into the impeller chamber 6 is stopped, water is pumped, and normal water pumping operation is performed.
一方、吸水井Ｐの水位が上記最低水位よりも上位から下
降している場合において、水位検出計５により水位が最
低水位に達していないことが検出されている間は電動吸
気弁４が閉じられたままになって揚水運転が行われる。On the other hand, when the water level in the water intake well P is falling from above the minimum water level, the electric intake valve 4 is closed while the water level detector 5 detects that the water level has not reached the minimum water level. Pumping operation will continue.
水位検出計５により水位が最低水位に達したことが検出
されると、電動吸気弁４が開かれ径小な分岐管３を通し
て羽根車室６に空気が吸い込まれ、揚水が遮断されて気
中運転に切り替わる。When the water level detector 5 detects that the water level has reached the lowest water level, the electric intake valve 4 is opened and air is sucked into the impeller chamber 6 through the small diameter branch pipe 3, and water pumping is cut off and the air Switch to driving.
したがって、この立軸ポンプによれば、突発的な水位の
上昇や下降に対処し得る全速待機運転ができるようにな
り、上述した水位の異常上昇による洪水や異常低下によ
るポンプ運転機能障害を未然に防止することが可能にな
る。Therefore, this vertical shaft pump enables full-speed standby operation that can cope with sudden rises and falls in the water level, and prevents the above-mentioned flooding due to abnormal rises in water levels and pump operational failures due to abnormal drops. It becomes possible to do so.
［発明が解決しようとする課題］
しかしながら、この立軸ポンプに用いられている水位検
出計５は水質や塵芥などによる悪影響を受けやすい。こ
のことは上記立軸ポンプが不慮の出水などに対処し得る
ことを要求されるものであることを考えるときわめて重
要な課題の一つである。[Problems to be Solved by the Invention] However, the water level detector 5 used in this vertical shaft pump is easily affected by water quality, dust, and the like. This is an extremely important issue considering that the vertical shaft pump is required to be able to cope with unexpected water outflows.
また、電動吸気弁４は外部駆動源およびそれを操作させ
るためのシーケンス制御が必要となる。Furthermore, the electric intake valve 4 requires an external drive source and sequence control to operate it.
このような事情を踏まえ、本願出願人はさらに特願平１
−１１３１９３号において、水位検出計や電動吸気弁を
用いずに全速待機運転を行わせることが可能な立軸ポン
プを提案した。In light of these circumstances, the applicant further filed the patent application No.
In No. 113193, we proposed a vertical shaft pump that can perform full-speed standby operation without using a water level detector or an electric intake valve.
即ち、この立軸ポンプは、第４図に示すように、逆Ｕ字
状の分岐管３の一端を吸込みケーシング２に連通接続し
１大気に開放され空気の導入により当該立軸ポンプの揚
水を遮断させる分岐管３の他端の空気導入部７を当該立
軸ポンプの最低水位ＬＷＬ付近に設定し、分岐管３の折
返し部８を、羽根車１を全速運転したときに羽根車室６
の吸込部に発生する最大負圧による吸込み揚程よりも高
い位置に設定したものである。That is, as shown in FIG. 4, in this vertical shaft pump, one end of an inverted U-shaped branch pipe 3 is connected to the suction casing 2 so as to be open to the atmosphere, and the pumping of water by the vertical shaft pump is interrupted by introducing air. The air introduction part 7 at the other end of the branch pipe 3 is set near the lowest water level LWL of the vertical shaft pump, and the folded part 8 of the branch pipe 3 is set to the impeller chamber 6 when the impeller 1 is operated at full speed.
This is set at a position higher than the suction lift due to the maximum negative pressure generated in the suction section of the pump.
この立軸ポンプにおいて、それが全速運転中に吸水井Ｐ
の水位が上記最低水位ＬＷＬよりも下位から上昇してい
る場合は、次のようになる。In this vertical shaft pump, when it is running at full speed, the suction well P
If the water level is rising from below the minimum water level LWL, the following will occur.
■ 水位が空気導入部７に達していないときは、空気導
入部７から分岐管３を経て羽根車室６に空気が入り込む
ため、揚水は行われず、気中での全速運転が行われる。- When the water level has not reached the air introduction part 7, air enters the impeller chamber 6 from the air introduction part 7 through the branch pipe 3, so water is not pumped and full speed operation in air is performed.
水位が上記最低氷位ＬＷＬに達すると上記空気導入部７
は水封されるため、立軸ポンプは吸込みケーシング２や
分岐管３内の残留空気を吸込みながら速やかに揚水運転
に切り替わり、吸込みケーシング２の残留空気が完全に
吸い込まれた時点で完全な揚水運転が行われる。そして
、分岐管３の折返し部８が、羽根車室６に発生する最大
負圧による吸込み揚程よりも高い位置に設定されている
ため、揚水運転中は分岐管３の垂下管部１ｏに上記羽根
車室６の負圧に相当する高さだけ水が吸い上げられて釣
り合った状態になり、分岐管３からの羽根車室６には給
水されず、水は吸込みケーシング２を通して吸い上げら
れて円滑な揚水運転が行われる。When the water level reaches the lowest ice level LWL, the air introduction section 7
is water-sealed, the vertical shaft pump quickly switches to pumping operation while sucking in the residual air in the suction casing 2 and branch pipe 3, and complete pumping operation is completed when the residual air in the suction casing 2 is completely sucked in. It will be done. Since the folded part 8 of the branch pipe 3 is set at a position higher than the suction lift due to the maximum negative pressure generated in the impeller chamber 6, the above-mentioned impeller is attached to the hanging pipe part 1o of the branch pipe 3 during pumping operation. Water is sucked up to a height corresponding to the negative pressure in the casing 6, creating a balanced state, and water is not supplied to the impeller chamber 6 from the branch pipe 3, but water is sucked up through the suction casing 2 to ensure smooth pumping. Driving takes place.
■ 立軸ポンプの全速運転中に吸水井Ｐの水位が上記最
低水位ＬＷＬよりも上位から下降している場合は、次の
ようになる。■ If the water level in the water suction well P falls from above the minimum water level LWL while the vertical shaft pump is operating at full speed, the following will occur.
水位が記空気導入部７に達していないときはその空気導
入部７が水封されたままになっているため、揚水運転が
続行され、分岐管３の垂下管部１０には上記羽根車室６
の負圧に相当する高さだけ水が吸い上げられて釣り合っ
た状態になっている。When the water level has not reached the air introduction section 7, the air introduction section 7 remains water-sealed, so the pumping operation continues, and the hanging pipe section 10 of the branch pipe 3 is filled with the impeller chamber. 6
Water is sucked up to a height corresponding to the negative pressure of , creating a balanced state.
水位が最低水位ＬＷＬよりも下がると、分岐管３の空気
導入部７の水封が解除されるため、空気導入部７からの
空気導入によって垂下管部１０に吸い上げられていた水
の一部と分岐管３内の残留空気が羽根車室６に吸入され
、その後、空気導入部７から空気だけが羽根車室６に吸
入されていく結果、吸込みケーシング２などを満たして
いる水は揚水されず遮断されて速やかに気中運転に切り
替わる。When the water level falls below the lowest water level LWL, the water seal of the air introduction part 7 of the branch pipe 3 is released, so that some of the water that was sucked up into the hanging pipe part 10 by the air introduction from the air introduction part 7 is removed. The residual air in the branch pipe 3 is sucked into the impeller chamber 6, and then only air is sucked into the impeller chamber 6 from the air introduction part 7, so that the water filling the suction casing 2 etc. is not pumped up. It is shut off and immediately switches to air operation.
この立軸ポンプによれば、突発的な水位の上昇や下降に
対してポンプを全速運転状態として待機運転させること
ができるようになり、上述した水位の異常上昇による洪
水や異常低下によるポンプ運転機能障害を未然に防止す
ることが可能になり、同時に第３図の立軸ポンプのよう
に水位検出計５や吸水弁４を用いなくてもよいので、水
質や塵芥などにより水位検出計５が悪影響を受けるとい
った問題や制御装置が煩雑になるといった問題がなくな
り、不慮の出水などに確実に対処することができる。According to this vertical shaft pump, the pump can be operated at full speed and put into standby mode in the event of a sudden rise or fall in the water level, and the above-mentioned flooding due to an abnormal rise in water level or pump operation malfunction due to an abnormal drop in water level can be avoided. At the same time, unlike the vertical shaft pump shown in Fig. 3, there is no need to use the water level detector 5 or water intake valve 4, so the water level detector 5 can be prevented from being adversely affected by water quality, dust, etc. This eliminates problems such as complicating the control device and making it possible to reliably deal with unexpected flooding.
ところで、この第４図のような立軸ポンプの場合、最低
水位ＬＷＬ付近において、水面が下降して分岐管３の空
気導入部７の水封が解除される状態と、再び水面が上昇
して分岐管３の空気導入部７の水封が行われる状態が短
時間のうちに頻繁に繰り返されると、上記立軸ポンプは
揚水遮断による気中運転と揚水運転が短時間のうちに頻
繁に繰り返されるハンチング現象が生じることとなり、
羽根車１に無理な力が加わってポンプ機能障害を引き起
こす懸念がある。By the way, in the case of a vertical shaft pump as shown in Fig. 4, near the lowest water level LWL, the water level falls and the water seal of the air introduction part 7 of the branch pipe 3 is released, and the water level rises again and the water seal is released. If the water-sealing of the air introduction part 7 of the pipe 3 is repeated frequently within a short period of time, the vertical shaft pump will suffer from hunting, where air operation and pumping operation due to pumping cutoff are repeated frequently within a short period of time. A phenomenon will occur,
There is a concern that excessive force may be applied to the impeller 1, causing pump malfunction.
したがって、本発明は、第４図のようなタイプの立軸ポ
ンプにおいて、上記のようなハンチング現象の発生を防
止することができる立軸ポンプを提供することを目的と
する。Therefore, an object of the present invention is to provide a vertical shaft pump of the type shown in FIG. 4, which can prevent the hunting phenomenon described above from occurring.
［課題を解決するための手段］
本発明の立軸ポンプは、上記目的を達成するたに、第１
の発明では、第４図のようなタイプの立軸ポンプにおい
て、水面の下降により分岐管の空気導入部から羽根車室
に空気が導入され立軸ポンプの揚水状態が遮断された後
再び水面が上昇し空気導入部が水封されても立軸ポンプ
の揚水遮断状態を確保し得るだけの空気を導入し得うる
上下方向に延びる空気導入管の一端を、上記羽根車室に
発生する最大負圧による吸込み揚程よりも高い位置にお
ける分岐管の箇所に連通接続し、大気に開放された空気
導入管の他端を、上記分岐管の空気導入部よりも上方に
設定したものである。[Means for Solving the Problems] In order to achieve the above object, the vertical shaft pump of the present invention has the following features:
In the invention, in the vertical shaft pump of the type shown in Fig. 4, air is introduced into the impeller chamber from the air introduction part of the branch pipe as the water level falls, and after the pumping state of the vertical shaft pump is interrupted, the water level rises again. The maximum negative pressure generated in the impeller chamber is used to draw air into one end of the air introduction pipe, which extends in the vertical direction and is capable of introducing enough air to ensure the pumping cut-off state of the vertical shaft pump even if the air introduction part is water-sealed. The other end of the air introduction pipe, which is connected to the branch pipe at a position higher than the lift height and opened to the atmosphere, is set above the air introduction part of the branch pipe.
また、第２の発明では、第４図のようなタイプの立軸ポ
ンプにおいて、水面の下降により分岐管の空気導入部か
ら羽根車室に空気が導入され立軸ポンプの揚水状態が遮
断された後再び水面が上昇し空気導入部が水封されても
立軸ポンプの揚水遮断状態を確保し得るだけの空気を導
入し得うる逆Ｕ字状の空気導入管の一端を、上記吸込み
ケーシングに連通接続させた側の分岐管の立ち上がり管
部に連通接続し、大気に開放され空気が導入される空気
導入管の他端を上記分岐管の空気導入部よりも上方に設
定し、空気導入管の折返し部を上記羽根車室に発生する
最大負圧による吸込み揚程よりも高い位置に設定したも
のである。In addition, in the second invention, in the vertical shaft pump of the type shown in FIG. One end of the inverted U-shaped air introduction pipe is connected to the suction casing, which can introduce enough air to ensure that the vertical shaft pump can shut off pumping even if the water level rises and the air introduction part is water-sealed. The other end of the air introduction pipe, which is connected to the rising pipe part of the branch pipe on the other side and is open to the atmosphere and introduces air, is set above the air introduction part of the branch pipe, and the folded part of the air introduction pipe is connected to the rising pipe part of the branch pipe on the other side. is set at a position higher than the suction lift due to the maximum negative pressure generated in the impeller chamber.
また、第３の発明では、第４図のようなタイプの立軸ポ
ンプにおいて、水面の下降により分岐管の空気導入部か
ら羽根車室に空気が導入され立軸ポンプの揚水状態が遮
断された後再び水面が上昇し空気導入部が水封されても
立軸ポンプの揚水遮断状態を確保し得るだけの空気を導
入し得うる逆Ｕ字状の空気導入管の一端を、上記分岐管
の一端が吸込みケーシングに連通接続された位置と同一
レベルもしくはそれに近いレベルの位置で吸込みケーシ
ングに連通接続し、大気に開放され空気が導入される空
気導入管の他端を上記分岐管の空気導入部よりも上方に
設定し、空気導入管の折返し部を上記羽根車室に発生す
る最大負圧による吸込み揚程よりも高い位置に設定した
ものである。In addition, in the third invention, in the vertical shaft pump of the type shown in FIG. One end of the above-mentioned branch pipe takes in one end of the inverted U-shaped air introduction pipe, which can introduce enough air to ensure that the vertical shaft pump can shut off pumping even if the water level rises and the air introduction part becomes water-sealed. The other end of the air introduction pipe, which is connected to the suction casing at the same level or at a level close to the position where it is connected to the casing and is open to the atmosphere and where air is introduced, is placed above the air introduction part of the branch pipe. The folded part of the air introduction pipe is set at a position higher than the suction lift due to the maximum negative pressure generated in the impeller chamber.
［作 用］
第１．第２．第３の発明によれば、水面が下降して分岐
管３の空気導入部７の水封が解除され、再び水面が上昇
して分岐管３の空気導入部７が水封されても、大気に開
放された空気導入管の他端が分岐管の空気導入部よりも
上方に設定されているため、水位がある程度上昇して空
気導入管の他端が水封されるまでは、空気導入管の他端
から空気が導入されることになり、この導入された空気
は羽根車室に吸入されて立軸ポンプは揚水開始状態とな
らず、このため分岐管３の空気導入部７の付近において
水封と大気開放が繰り返し行われることによる上記立軸
ポンプの気中運転と揚水運転のハンチング現象が有効に
防止される。[Function] 1st. Second. According to the third invention, even if the water level falls and the water seal of the air introduction part 7 of the branch pipe 3 is released, and the water level rises again and the air introduction part 7 of the branch pipe 3 becomes water sealed, the air Since the other end of the air inlet pipe that is open to Air will be introduced from the other end, and the introduced air will be sucked into the impeller chamber and the vertical shaft pump will not be able to start pumping water. This effectively prevents the hunting phenomenon of the above-mentioned vertical shaft pump during air operation and pumping operation due to repeated sealing and release to the atmosphere.
また、第１の発明では空気導入管の一端を、羽根車室に
発生する最大負圧による吸込み揚程よりも高い位置にお
ける分岐管の箇所に連通接続しており、第２．第３の発
明では空気導入管の折返し部を、羽根車室に発生する最
大負圧による吸込み揚程よりも高い位置に設定している
ため、立軸ポンプの揚水開始時には、羽根車室６の負圧
に相当する高さだけ水が空気導入管内に吸い上げられて
釣り合った状態になり、空気導入管の一端から分岐管や
羽根車室６に水が導入されず、したがって空気導入管の
他端には空気吸造渦が生じるような吸込作用は発生せず
、揚水運転を適正に行える。Furthermore, in the first aspect of the invention, one end of the air introduction tube is connected in communication with a portion of the branch tube at a position higher than the suction lift due to the maximum negative pressure generated in the impeller chamber. In the third invention, since the folded part of the air introduction pipe is set at a position higher than the suction lift due to the maximum negative pressure generated in the impeller chamber, when the vertical shaft pump starts pumping water, the negative pressure in the impeller chamber 6 is lowered. Water is sucked up into the air introduction pipe by a height corresponding to the height of There is no suction action that causes air suction eddies, and pumping operation can be performed appropriately.
［発明の効果］
以上のように、本発明は、羽根車室に連通ずる吸込みケ
ーシングに逆Ｕ字状の分岐管の一端を連通接続し、大気
に開放され空気の導入により当該室軸ポンプの揚水を遮
断させる分岐管の他端の空気導入部を当該室軸ポンプの
最低水位付近に設定し、分岐管の折返し部を上記羽根車
室に発生する最大負圧による吸込み揚程よりも高い位置
に設定した立軸ポンプにおいて、分岐管の空気導入部の
付近において水封と大気開放が繰り返し行われることに
よる上記立軸ポンプの気中運転と揚水運転のハンチング
現象を確実かつ適正に防止することができるものである
。[Effects of the Invention] As described above, the present invention connects one end of an inverted U-shaped branch pipe to the suction casing that communicates with the impeller chamber, and is opened to the atmosphere to introduce air to the chamber shaft pump. Set the air introduction part at the other end of the branch pipe that shuts off water pumping to near the lowest water level of the chamber shaft pump, and set the folded part of the branch pipe to a position higher than the suction head due to the maximum negative pressure generated in the impeller chamber. A vertical shaft pump that can reliably and appropriately prevent the hunting phenomenon of air operation and pumping operation of the vertical shaft pump due to repeated water sealing and atmospheric release near the air introduction part of the branch pipe. It is.
第１図は第１の発明の一実施例の立軸ポンプを示してい
る。FIG. 1 shows a vertical shaft pump according to an embodiment of the first invention.
この立軸ポンプは、上記第４図の立軸ポンプと同タイプ
の立軸ポンプを示しているもので、羽根車室６に連通す
る吸込みケーシング２に、最低水位ＬＷＬよりも上方の
位置において逆Ｕ字状の分岐管３の一端を連通接続し、
大気に開放され空気の導入により当該室軸ポンプの揚水
を遮断させる分岐管３の他端の空気導入部７を最低水位
ＬＷＬ付近（Ａ位置）に設定し、分岐管３の折返し部８
を上記羽根車室６に発生する最大負圧による吸込み揚程
よりも高い位置に設定している。This vertical shaft pump shows a vertical shaft pump of the same type as the vertical shaft pump shown in FIG. One end of the branch pipe 3 is connected for communication,
The air introduction part 7 at the other end of the branch pipe 3, which is open to the atmosphere and shuts off water pumping by the chamber shaft pump by introducing air, is set near the lowest water level LWL (position A), and the folded part 8 of the branch pipe 3
is set at a position higher than the suction lift due to the maximum negative pressure generated in the impeller chamber 6.
そして、この立軸ポンプには、分岐管３の空気導入部７
の付近（Ａ位置）において、水面の上昇下降により水封
と大気開放が繰り返し行われることによる立軸ポンプの
気中運転と揚水運転の繰り返し現象（ハンチング現象）
を防止するための空気導入管４を設けている。This vertical shaft pump has an air introduction section 7 of the branch pipe 3.
In the vicinity of (A position), the vertical shaft pump repeatedly operates in the air and pumps water (hunting phenomenon) due to repeated water sealing and atmospheric release due to the rise and fall of the water surface.
An air introduction pipe 4 is provided to prevent this.
この空気導入管４は、水位の下降により分岐管３の空気
導入部７から羽根車室６に空気が導入され立軸ポンプの
揚水状態が遮断された後再び水位あるいは波立ち等によ
り水面が上昇し空気導入部７が水封されても室軸ポンプ
の揚水遮断状態を確保し得るように分岐管３の空気導入
量よりも少ない細い管径としているもので、上下方向に
延ばし、その一端を、上記羽根車室６に発生する最大負
圧による吸込み揚程よりも高い位置における分岐管３の
箇所（図では分岐管３の折返し部８）に連通接続し、大
気に開放させた他端を、上記分岐管３の空気導入部７よ
りも所定距離上方（Ｂ位置）に設定している。Air is introduced into the impeller chamber 6 from the air introduction part 7 of the branch pipe 3 due to a drop in the water level, and after the pumping state of the vertical shaft pump is interrupted, the water level rises again due to the water level or waves, etc., and air is introduced into the impeller chamber 6. In order to ensure that the pumping of the chamber shaft pump is shut off even if the introduction part 7 is water-sealed, the diameter of the pipe is smaller than the amount of air introduced into the branch pipe 3. The other end of the branch pipe 3, which is connected to the branch pipe 3 at a position higher than the suction head due to the maximum negative pressure generated in the impeller chamber 6 (in the figure, the folded part 8 of the branch pipe 3) and opened to the atmosphere, is It is set a predetermined distance above the air introduction part 7 of the pipe 3 (position B).
したがって、このような構成によれば、水位が下降して
分岐管３の空気導入部７から羽根車室６に空気が導入さ
れ立軸ポンプの揚水状態が一旦遮断されると、再び水位
あるいは水面がＡ位置より上昇しても、水位がＢ位置に
上昇し空気導入管４の他端が水封されるまでは、空気導
入管４の他端から空気が羽根車室６に吸入されることと
なり、立軸ポンプの揚水遮断状態が維持されて揚水開始
状態とはならない。そのため、分岐管３の空気導入部７
の付近において水封と大気開放が繰り返し行われること
による気中運転と揚水運転の繰り返し現象（ハンチング
現象）が有効に防止される。Therefore, according to such a configuration, when the water level falls and air is introduced into the impeller chamber 6 from the air introduction part 7 of the branch pipe 3 and the pumping state of the vertical shaft pump is once interrupted, the water level or water surface will rise again. Even if the water level rises from position A, air will continue to be drawn into the impeller chamber 6 from the other end of the air introduction pipe 4 until the water level rises to position B and the other end of the air introduction pipe 4 is sealed. , the pumping cut-off state of the vertical shaft pump is maintained and the pumping does not start. Therefore, the air introduction part 7 of the branch pipe 3
This effectively prevents the phenomenon of repeated air operation and pumping operation (hunting phenomenon) due to repeated water sealing and atmospheric release near the area.
また、上記立軸ポンプの場合、水位が上昇してＢ位置を
越えると、空気導入管４の他端も水封されるため、空気
は羽根車室６に入らず、通常の揚水運転が行われる。こ
の場合、上記空気導入管４は、その一端を、羽根車室６
に発生する最大負圧による吸込み揚程よりも高い位置に
おける分岐管３の箇所に連通接続しているため、揚水開
始時には、羽根車室６の負圧に相当する高さだけ水が空
気導入管４の途中まで吸い上げられて釣り合った状態と
なり、その吸い上げられ水は空気導入管４の一端から分
岐管３や羽根車室、６へは流入されない。したがって、
空気導入管４の他端は空気吸造渦が生じるような吸込作
用は発生せず、揚水運転を適正に行うことができる。In addition, in the case of the above-mentioned vertical shaft pump, when the water level rises and exceeds position B, the other end of the air introduction pipe 4 is also sealed with water, so air does not enter the impeller chamber 6 and normal water pumping operation is performed. . In this case, the air introduction pipe 4 has one end connected to the impeller chamber 6.
Since the branch pipe 3 is connected to the branch pipe 3 at a position higher than the suction lift due to the maximum negative pressure generated in The water is sucked up halfway and becomes balanced, and the sucked water does not flow from one end of the air introduction pipe 4 into the branch pipe 3 or the impeller chamber 6. therefore,
At the other end of the air introduction pipe 4, no suction action that causes an air suction vortex occurs, and pumping operation can be performed appropriately.
また、水位が下降して水面がＡと８間に位置する場合は
、空気導入管４の他端から少量の空気が入り、その空気
は分岐管３を通って羽根車室６に吸入されるが、分岐管
３の空気導入部７は水封されているため揚水遮断は起こ
らず揚水運転状態が続けられる。Also, when the water level falls and the water surface is located between A and 8, a small amount of air enters from the other end of the air introduction pipe 4, and the air is sucked into the impeller chamber 6 through the branch pipe 3. However, since the air introduction portion 7 of the branch pipe 3 is water-sealed, the pumping operation is not interrupted and the pumping operation continues.
さらに、水位が下降して水面がＡ位置より低下すると、
分岐管３の空気導入部７は大気に開放されるため、空気
導入部７から大量の空気が入り、その空気が羽根車室６
に吸入されて、揚水遮断されるものである。Furthermore, when the water level falls and the water surface falls below position A,
Since the air introduction part 7 of the branch pipe 3 is open to the atmosphere, a large amount of air enters from the air introduction part 7, and the air flows into the impeller chamber 6.
The water is inhaled by the water, and the water pumping is cut off.
第２図は、実線で書いた空気導入管４′が第２の発明の
実施例を示し、点線で書いた空気導入管４′が第３の発
明の実施例を示している。In FIG. 2, the air introduction pipe 4' drawn in solid lines shows the embodiment of the second invention, and the air introduction pipe 4' drawn in dotted lines shows the embodiment of the third invention.
即ち、第２の発明に係る実施例の空気導入管４′は、上
記実施例の空気導入管４と同様細い管径のもので逆Ｕ字
状に形成しており、空気導入管４′の一端を、吸込みケ
ーシング２に連通接続させた側の分岐管３の立ち上がり
管部９に連通接続し、空気導入管４′の大気に開放され
る他端を、上記実施例の空気導入管４と同様Ｂ位置に設
定し、空気導入管４′の折返し部４’ Ａを上記羽根車
室６に発生する最大負圧による吸込み揚程よりも高い位
置に設定しているものである。That is, the air introduction pipe 4' of the embodiment according to the second invention has a small diameter and is formed in an inverted U shape, similar to the air introduction pipe 4 of the above embodiment. One end is connected to the rising pipe part 9 of the branch pipe 3 on the side connected to the suction casing 2, and the other end of the air introduction pipe 4' which is open to the atmosphere is connected to the air introduction pipe 4 of the above embodiment. Similarly, it is set at position B, and the folded portion 4'A of the air introduction pipe 4' is set at a position higher than the suction lift due to the maximum negative pressure generated in the impeller chamber 6.
また、第３の発明に係る実施例の空気導入管４′も、上
記実施例の空気導入管４と同様細い管径のもので逆Ｕ字
状に形成しており、空気導入管４′の一端を、分岐管３
の一端が吸込みケーシング２に連通接続された位置と同
一レベルもしくはそれに近いレベルの位置で吸込みケー
シング２に連通接続し、空気導入管４′の大気に開放さ
れる他端を、上記実施例の空気導入管４と同様Ｂ位置に
設定し、空気導入管４′の折返し部４’Ａを上記羽根車
室６に発生する最大負圧による吸込み揚程よりも高い位
置に設定しているものである。Further, the air introduction pipe 4' of the embodiment according to the third invention is also of a small diameter and formed in an inverted U-shape like the air introduction pipe 4 of the above embodiment. Connect one end to branch pipe 3
One end of the air inlet pipe 4' is connected to the suction casing 2 at the same level or at a level close to the position where it is connected to the suction casing 2, and the other end of the air introduction pipe 4', which is open to the atmosphere, is connected to the air of the above embodiment. Like the introduction pipe 4, it is set at position B, and the folded portion 4'A of the air introduction pipe 4' is set at a position higher than the suction lift due to the maximum negative pressure generated in the impeller chamber 6.
以上のような構成でも、上記実施例の空気導入管４の場
合と同様、水位がＢ位置に上昇し空気導入管４′ ４′
の他端が水封されるまでは、揚水遮断状態が維持されて
揚水開始状態にならず、このため分岐管３の空気導入部
７の付近において水封と大気開放が繰り返し行われるこ
とによる気中運転と揚水運転の繰り返し現象（ハンチン
グ現象）が有効に防止される。Even with the above configuration, as in the case of the air introduction pipe 4 of the above embodiment, the water level rises to position B and the air introduction pipe 4'4'
Until the other end is water-sealed, the pumping cut-off state is maintained and pumping does not start. Therefore, the water-sealing and atmospheric release are repeated in the vicinity of the air introduction section 7 of the branch pipe 3, causing air leakage. The phenomenon of repeating medium operation and pumping operation (hunting phenomenon) is effectively prevented.
また、空気導入管４’ 、４’の折返し部４′Ａ。Also, the folded portions 4'A of the air introduction pipes 4', 4'.
４’Ａが羽根車室６に発生する最大負圧による吸込み揚
程よりも高い位置に設定されているため、水位が上昇し
Ｂ位置を越えて揚水を開始しても、羽根車室６の負圧に
相当する高さだけ水が空気導入管４’、４’の途中まで
吸い上げられて釣り合い状態となり、その吸い上げられ
水は空気導入管４′ ４′の一端から分岐管３や羽根車
室６へは流入されず、このため空気導入管４’ 、４’
の他端に空気吸造渦が生じるような吸込作用が発生する
ことはない。4'A is set at a position higher than the suction head due to the maximum negative pressure generated in the impeller chamber 6, so even if the water level rises and pumping starts beyond position B, the negative pressure in the impeller chamber 6 Water is sucked up to the middle of the air introduction pipes 4', 4' by a height corresponding to the pressure, creating an equilibrium state, and the sucked water flows from one end of the air introduction pipes 4', 4' to the branch pipe 3 and the impeller chamber 6. Therefore, the air inlet pipes 4', 4'
There is no suction action that would create an air suction vortex at the other end.
なお、上記各実施例では、空気導入間４．４′４′への
空気導入量を、管径を細めることによって制限している
が、この場合に限られず、管径が太くても途中に空気導
入量調整弁を設けることによって分岐管３あるいは羽根
車室６への空気導入量を制御するようにしてもよい。In each of the above embodiments, the amount of air introduced into the air introduction gap 4.4'4' is limited by narrowing the pipe diameter, but this is not the only case. The amount of air introduced into the branch pipe 3 or the impeller chamber 6 may be controlled by providing an air introduction amount adjustment valve.
第１図は第１の発明の一実施例を示す交軸ポンプの概略
図、第２図は第２．第３の発明の実施例を示す立軸ポン
プの概略図、第３図は従来の交軸ポンプの概略図、第４
図は比較例の説明図である。
２・・・吸込みケーシング、３・・・分岐管、４，４′
４′・・・空気導入管、４’ Ａ、４’ Ａ・・・空気
導入管の折返し部、６・・・羽根車室、７・・・分岐管
の空気導部、８・・・分岐管の折返し部、９・・・分岐
管の立ち上がり管部。FIG. 1 is a schematic diagram of a cross-shaft pump showing an embodiment of the first invention, and FIG. A schematic diagram of a vertical shaft pump showing an embodiment of the third invention, FIG. 3 is a schematic diagram of a conventional cross shaft pump, and FIG.
The figure is an explanatory diagram of a comparative example. 2... Suction casing, 3... Branch pipe, 4, 4'
4'... Air introduction pipe, 4' A, 4' A... Turned part of air introduction pipe, 6... Impeller chamber, 7... Air guide part of branch pipe, 8... Branch Turned part of pipe, 9... Rising pipe part of branch pipe.
Claims (3)
の分岐管の一端を連通接続し、大気に開放され空気の導
入により当該立軸ポンプの揚水を遮断させる分岐管の他
端の空気導入部を当該立軸ポンプの最低水位付近に設定
し、分岐管の折返し部を上記羽根車室に発生する最大負
圧による吸込み揚程よりも高い位置に設定した立軸ポン
プであって、水位の下降により分岐管の空気導入部から
羽根車室に空気が導入され立軸ポンプの揚水状態が遮断
された後再び水位が上昇し空気導入部が水封されても立
軸ポンプの揚水遮断状態を確保し得るだけの空気を導入
し得うる上下方向に延びる空気導入管の一端を、上記羽
根車室に発生する最大負圧による吸込み揚程よりも高い
位置における分岐管の箇所に連通接続し、大気に開放さ
れた空気導入管の他端を、上記分岐管の空気導入部より
も上方に設定したことを特徴とする立軸ポンプ。(1) One end of the inverted U-shaped branch pipe is connected to the suction casing that communicates with the impeller chamber, and air is introduced at the other end of the branch pipe, which is opened to the atmosphere and shuts off water pumping by the vertical pump by introducing air. This is a vertical shaft pump in which the part of the branch pipe is set near the lowest water level of the vertical shaft pump, and the folded part of the branch pipe is set at a position higher than the suction lift due to the maximum negative pressure generated in the impeller chamber. After air is introduced into the impeller chamber from the air introduction part of the pipe and the pumping state of the vertical shaft pump is cut off, even if the water level rises again and the air introduction part is water-sealed, it is sufficient to ensure the pumping cutoff state of the vertical shaft pump. One end of the air introduction pipe extending in the vertical direction that can introduce air is connected to a branch pipe at a position higher than the suction lift due to the maximum negative pressure generated in the impeller chamber, and the air is released to the atmosphere. A vertical shaft pump characterized in that the other end of the introduction pipe is set above the air introduction part of the branch pipe.
の分岐管の一端を連通接続し、大気に開放され空気の導
入により当該立軸ポンプの揚水を遮断させる分岐管の他
端の空気導入部を当該立軸ポンプの最低水位付近に設定
し、分岐管の折返し部を上記羽根車室に発生する最大負
圧による吸込み揚程よりも高い位置に設定した立軸ポン
プであって、水位の下降により分岐管の空気導入部から
羽根車室に空気が導入され立軸ポンプの揚水状態が遮断
された後再び水位が上昇し空気導入部が水封されても立
軸ポンプの揚水遮断状態を確保し得るだけの空気を導入
し得うる逆Ｕ字状の空気導入管の一端を、上記吸込みケ
ーシングに連通接続させた側の分岐管の立ち上がり管部
に連通接続し、大気に開放され空気が導入される空気導
入管の他端を上記分岐管の空気導入部よりも上方に設定
し、空気導入管の折返し部を上記羽根車室に発生する最
大負圧による吸込み揚程よりも高い位置に設定したこと
を特徴とする立軸ポンプ。(2) One end of the inverted U-shaped branch pipe is connected to the suction casing that communicates with the impeller chamber, and air is introduced at the other end of the branch pipe, which is opened to the atmosphere and shuts off water pumping by the vertical shaft pump. This is a vertical shaft pump in which the part of the branch pipe is set near the lowest water level of the vertical shaft pump, and the folded part of the branch pipe is set at a position higher than the suction lift due to the maximum negative pressure generated in the impeller chamber. After air is introduced into the impeller chamber from the air introduction part of the pipe and the pumping state of the vertical shaft pump is cut off, even if the water level rises again and the air introduction part is water-sealed, it is sufficient to ensure the pumping cutoff state of the vertical shaft pump. One end of the inverted U-shaped air introduction pipe that can introduce air is connected to the rising pipe part of the branch pipe on the side connected to the suction casing, and the air introduction pipe is opened to the atmosphere and air is introduced. The other end of the pipe is set above the air introduction part of the branch pipe, and the turned part of the air introduction pipe is set at a position higher than the suction head due to the maximum negative pressure generated in the impeller chamber. vertical shaft pump.
の分岐管の一端を連通接続し、大気に開放され空気の導
入により当該立軸ポンプの揚水を遮断させる分岐管の他
端の空気導入部を当該立軸ポンプの最低水位付近に設定
し、分岐管の折返し部を上記羽根車室に発生する最大負
圧による吸込み揚程よりも高い位置に設定した立軸ポン
プであって、水位の下降により分岐管の空気導入部から
羽根車室に空気が導入され立軸ポンプの揚水状態が遮断
された後再び水位が上昇し空気導入部が水封されても立
軸ポンプの揚水遮断状態を確保し得るだけの空気を導入
し得うる逆Ｕ字状の空気導入管の一端を、上記分岐管の
一端が吸込みケーシングに連通接続された位置と同一レ
ベルもしくはそれに近いレベルの位置で吸込みケーシン
グに連通接続し、大気に開放され空気が導入される空気
導入管の他端を上記分岐管の空気導入部よりも上方に設
定し、空気導入管の折返し部を上記羽根車室に発生する
最大負圧による吸込み揚程よりも高い位置に設定したこ
とを特徴とする立軸ポンプ。(3) One end of the inverted U-shaped branch pipe is connected to the suction casing that communicates with the impeller chamber, and air is introduced at the other end of the branch pipe, which is opened to the atmosphere and shuts off water pumping by the vertical pump by introducing air. This is a vertical shaft pump in which the part of the branch pipe is set near the lowest water level of the vertical shaft pump, and the folded part of the branch pipe is set at a position higher than the suction lift due to the maximum negative pressure generated in the impeller chamber. After air is introduced into the impeller chamber from the air introduction part of the pipe and the pumping state of the vertical shaft pump is cut off, even if the water level rises again and the air introduction part is water-sealed, it is sufficient to ensure the pumping cutoff state of the vertical shaft pump. One end of the inverted U-shaped air introduction pipe that can introduce air is connected to the suction casing at the same level or close to the position where one end of the branch pipe is connected to the suction casing, and the air is connected to the suction casing. The other end of the air introduction pipe, which is opened to introduce air, is set above the air introduction part of the branch pipe, and the folded part of the air introduction pipe is set above the suction head due to the maximum negative pressure generated in the impeller chamber. This vertical shaft pump is characterized by being set at a high position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21994089A JPH0385391A (en) | 1989-08-25 | 1989-08-25 | Vertical shaft pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21994089A JPH0385391A (en) | 1989-08-25 | 1989-08-25 | Vertical shaft pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0385391A true JPH0385391A (en) | 1991-04-10 |
Family
ID=16743410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21994089A Pending JPH0385391A (en) | 1989-08-25 | 1989-08-25 | Vertical shaft pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0385391A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009203806A (en) * | 2008-02-26 | 2009-09-10 | Kubota Corp | Preceding standby operation pump and method for operating same |
| JP2010121480A (en) * | 2008-11-18 | 2010-06-03 | Kubota Corp | Preceding standby operation pump |
-
1989
- 1989-08-25 JP JP21994089A patent/JPH0385391A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009203806A (en) * | 2008-02-26 | 2009-09-10 | Kubota Corp | Preceding standby operation pump and method for operating same |
| JP2010121480A (en) * | 2008-11-18 | 2010-06-03 | Kubota Corp | Preceding standby operation pump |
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