JPH04148093A - Vertical shaft pump - Google Patents

Abstract

PURPOSE:To prevent overflow caused by a delay in the timing of a shift into a water pump-up operation, by disposing an auxiliary suction pipe in a suction pipe, by providing an auxiliary impeller in the auxiliary suction pipe, and by interposing a valve device between the suction pipe and the auxiliary suction pipe. CONSTITUTION:When the level of water in a pump-up water well 6 is lower than a pump-up cut-off level LWL, a vertical pump is air-driven, and is shifted into a water pump-up operation when the level of the pump-up water well 6 rises up to a pump-up start level HWL. With this arrangement, water is introduced into an impeller chamber 3, and is discharged through a discharge pipe 4. At this time, a plurality of blades 16 in a valve device 14 is automatically opened by a stream. Meanwhile, during air-driving operation, if a discharge is demanded when the water level slightly exceeds the pump-up cut-off level LWL, an air/water change-over means 7 is closed, and a clutch 11 is turned on. With this arrangement, the auxiliary impeller 10 is rotated so as to discharge water into a suction pipe 5 through an auxiliary suction pipe 8. In this phase, the valve plates 16 block an annular suction passage 13 so as to pool water above the valve plates 16, thereby it is possible to promote the pump-up operation by an impeller 2.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は立軸ポンプに係り、特に、要請に応じて、立軸
ポンプ固有の揚水開始水位よりも低い任意の水位で揚水
できるようにした技術に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vertical shaft pump, and particularly relates to a technology that allows water to be pumped at an arbitrary water level lower than the pumping start water level specific to the vertical shaft pump, upon request. .

（従来の技°術） 排水機場の吸水井に流入してきた水は、吸、水弁に配置
されている立軸ポンプの揚水運転によって排水される。(Conventional technology) Water flowing into a water intake well of a drainage pump station is drained by pumping operation of a vertical shaft pump located at a water intake valve.

ところで、揚水開始水位は立軸ポンプの羽根車の位置に
よって固有のレベルに設定されている。By the way, the pumping start water level is set to a specific level depending on the position of the impeller of the vertical pump.

つまり、従来は、揚水開始水位が立軸ポンプの羽根車入
口もしくはその近傍に設定されていた。That is, conventionally, the pumping start water level was set at or near the impeller inlet of the vertical shaft pump.

（発明が解決しようとする課題） しかし、このように揚水開始水位が立軸ポンプの羽根車
入口もしくはその近傍の固有のレベルに設定されている
と、例えば降雨情報などによって吸水井への流入水量の
増大が予測され、したがってポンプの揚水運転を先行さ
せて、予め吸水井の水位を可及的低レベルに保持してお
く要請があっても、水位が揚水開始水位に上昇するまで
揚水運転を行なうことができないので、揚水運転開始の
タイミングに遅れを生じて吸水井が溢水するおそれを有
している。(Problem to be solved by the invention) However, if the pumping start water level is set at a unique level at or near the impeller inlet of the vertical shaft pump, the amount of water flowing into the water intake well can be adjusted based on rainfall information, etc. Even if an increase is predicted and there is a request to keep the water level in the suction well as low as possible by starting the pump operation in advance, pumping operation will continue until the water level rises to the pumping starting water level. As a result, there is a risk that the water intake well will overflow due to a delay in the timing of the start of pumping operation.

本発明は、このような事情に鑑みなされたもので、排水
の要請に応じて支軸ポンプ固有の揚水水位にかかわるこ
となく揚水運転を先行させて、揚水運転へのタイミング
遅れによって生じる溢水を防止することのできる立軸ポ
ンプの提供を目的としている。The present invention has been developed in view of the above circumstances, and is capable of preventing overflows caused by timing delays in pumping operation by advancing pumping operation in response to requests for drainage, regardless of the pumping water level specific to the spindle pump. The purpose is to provide a vertical shaft pump that can

（課題を解決するための手段） 前記目的を達成するために、本発明は、主軸に固着され
た羽根車が羽根車室に回転自在に装入され、この羽根車
室の上下に吐出管と吸込管がそれぞれ連通接続された立
軸ポンプにおいて、前記吸込管内に上下両端部を開口し
た補助吸込管が配設され、この補助吸込管の内部に補助
羽根車が配置されており、該補助羽根車がクラッチを介
して前記主軸に接続された補助軸に固着されるとともに
、前記吸込管の内周と補助吸込管の外周とで形成される
環状吸込通路に、これを開閉する弁装置を配設したもの
である。(Means for Solving the Problems) In order to achieve the above object, the present invention includes an impeller fixed to a main shaft, which is rotatably inserted into an impeller chamber, and a discharge pipe arranged above and below the impeller chamber. In a vertical shaft pump in which suction pipes are connected to each other, an auxiliary suction pipe whose upper and lower ends are open is disposed in the suction pipe, an auxiliary impeller is disposed inside the auxiliary suction pipe, and the auxiliary impeller is fixed to an auxiliary shaft connected to the main shaft via a clutch, and a valve device for opening and closing the annular suction passage formed by the inner periphery of the suction pipe and the outer periphery of the auxiliary suction pipe is provided. This is what I did.

（作用） 本発明によれば、クラッチＯＦＦの状態で立軸ポンプを
気中運転している状態で、吸水井の水位が揚水開始水位
まで上昇すると自動的に揚水運転（排水運転）に切換え
られる。(Function) According to the present invention, when the water level of the water intake well rises to the pumping start water level while the vertical shaft pump is being operated in air with the clutch OFF, the pumping operation (drainage operation) is automatically switched.

一方、クラッチをＯＮすることにより、補助軸および補
助羽根車が回転して、補助吸込管に水が吸い込まれて上
端部開口から吐出される。このときに弁装置で環状吸込
通路を閉塞しておくと、上端部開口から吐出された水が
、弁装置の上部にたまり、比較的短時間で羽根車入口も
しくはその近傍に達して揚水運転されることになる。On the other hand, by turning on the clutch, the auxiliary shaft and the auxiliary impeller rotate, and water is sucked into the auxiliary suction pipe and discharged from the upper end opening. If the annular suction passage is closed with a valve device at this time, water discharged from the upper end opening will accumulate at the top of the valve device and reach the impeller inlet or its vicinity in a relatively short period of time, resulting in pumping operation. That will happen.

即ち、立軸ポンプを固有の揚水開始水位よりも下位の水
位で先行して揚水運転させることができる。したがって
、揚水運転への切換えタイミングに遅れを生じることは
ない。That is, the vertical shaft pump can be operated in advance at a water level lower than the specific pumping start water level. Therefore, there is no delay in the timing of switching to pumping operation.

（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) Embodiments of the present invention will be described below based on the drawings.

第１図は本発明の一実施例を適用した立軸ポンプを示す
正面図、第２図は第１図における■−■線に沿う拡大横
断平面図であり、これらの図において立軸ポンプは、主
軸１、この主軸ｌに固着された羽根車２、羽根車２を回
転自在に装入している羽根車室３および該羽根車室３の
上下に連通接続される吐出管４と吸込管（吸込ベルマウ
ス）５を具備しており、通常は、吸水井６の水位が羽根
車入口２Ａもしくはその近傍に相当する揚水開始水位Ｈ
ＷＬに到達した時点で揚水運転できるようになっている
。FIG. 1 is a front view showing a vertical shaft pump to which an embodiment of the present invention is applied, and FIG. 2 is an enlarged cross-sectional plan view taken along the line ■-■ in FIG. 1. An impeller 2 fixed to the main shaft l, an impeller chamber 3 in which the impeller 2 is rotatably installed, and a discharge pipe 4 and a suction pipe (suction pipes) connected above and below the impeller chamber 3. Normally, the water level in the water suction well 6 is at the pumping start water level H, which corresponds to the impeller inlet 2A or its vicinity.
Pumping operation is possible once WL is reached.

また、吸水井６の水位が揚水開始水位ＨＷＬよりも低い
レベルの揚水遮断水位ＬＷＬに低下したとき、図示され
ていない水位センサーからの水位検出信号によって開成
する気水切換手段７または水位によって直接空気流入路
を遮断する手段を介して吸込管５に大気が導入され、こ
れによって生じる真空破壊により気中運転に切換えられ
る。When the water level in the water intake well 6 drops to the pumping cutoff water level LWL, which is lower than the pumping start water level HWL, the air/water switching means 7 is opened in response to a water level detection signal from a water level sensor (not shown), or the air/water switching means 7 is opened directly by the water level. Atmospheric air is introduced into the suction pipe 5 through means for blocking the inflow path, and the resulting vacuum break causes a switch to air operation.

吸込管５内には、上下両端部を開口し、かつ下端部を吸
込管５の下端部よりも僅かに下方に延出させた補助吸込
管８を、放射状にのびる例えば３本のアーム９で支持し
て同心に配設している。Inside the suction pipe 5 is an auxiliary suction pipe 8 which is open at both upper and lower ends and whose lower end extends slightly below the lower end of the suction pipe 5, and is provided with, for example, three arms 9 extending radially. They are supported and arranged concentrically.

補助吸込管８の内部に補助羽根車ｌＯが配置されている
。この補助羽根車１０の位置は、吸込管５の下部が水中
にあるのにもかかわらず、水位が一定のレベルよりも低
いと、羽根車２の回転によって渦を生じて空気混じりの
水を吸い込んでしまう傭々の支軸ポンプ固有の最低水位
ＬＷＬと同レベルもしくはそれよりも低位に設定されて
いる。An auxiliary impeller IO is arranged inside the auxiliary suction pipe 8. The position of this auxiliary impeller 10 is such that even though the lower part of the suction pipe 5 is underwater, when the water level is lower than a certain level, the rotation of the impeller 2 creates a vortex and sucks in water mixed with air. It is set at the same level as or lower than the lowest water level LWL specific to the spindle pump.

補助羽根車ｌＯは、クラッチ（例えば電磁クラッチ）１
１を介して主軸１に係脱可能に接続された補助軸１２に
固着されており、吸込管５の内周と補助吸込管８の外周
とで形成される環状吸込通路１３に弁装置１４が配設さ
れている。The auxiliary impeller lO is connected to a clutch (for example, an electromagnetic clutch) 1
A valve device 14 is fixed to an auxiliary shaft 12 which is removably connected to the main shaft 1 through a valve 1, and a valve device 14 is connected to an annular suction passage 13 formed by the inner circumference of the suction pipe 5 and the outer circumference of the auxiliary suction pipe 8. It is arranged.

弁装置１４は、第３図に示すように、補助吸込管８の外
周側の枢支点１５を回動中心として、自重により実線で
示す閉弁位置に回動し、環状吸込通路１３に吸い込まれ
る水流によって仮想線で示す開弁位置に回動する周方向
に複数（ただし第３図には２つのみを示している）配設
された弁板１６によって構成されている。As shown in FIG. 3, the valve device 14 is rotated by its own weight around a pivot point 15 on the outer circumferential side of the auxiliary suction pipe 8 to a closed position shown by a solid line, and is sucked into the annular suction passage 13. It is composed of a plurality of valve plates 16 (however, only two are shown in FIG. 3) disposed in the circumferential direction, which are rotated by water flow to the valve open position shown by the phantom line.

つぎに前記構成の作動を説明する。Next, the operation of the above configuration will be explained.

ポンプ吸水井６の水位が揚水遮断水位ＬＷＬ以下のレベ
ルで、気水切換手段７を開成し、かつクラッチ１１をＯ
ＦＦの状態に保持することで支軸ポンプが気中運転され
る。When the water level of the pump suction well 6 is below the pumping cutoff water level LWL, the air/water switching means 7 is opened and the clutch 11 is turned to O.
By maintaining the FF state, the spindle pump is operated in air.

気中運転の継続により、吸水井６の水位が揚水開始水位
ＨＷＬまで上昇すると、吸込管５内の水位は羽根車入口
２Ａもしくはその近傍まで上昇しここで自動的に揚水運
転（排水運転）に切換えられる。As the submerged operation continues, when the water level in the water suction well 6 rises to the pumping start water level HWL, the water level in the suction pipe 5 rises to the impeller inlet 2A or its vicinity, and pumping operation (drainage operation) is automatically started here. Can be switched.

揚水運転に切換えられることで、水は環状吸込通路１３
と補助吸込管８を通って羽根車室３に原板し、吐出管４
を通って排水される。そして、環状吸込通路１３に吸い
込まれる水流によって、複数の弁板１６は仮想線で示す
開弁位置に自動的に回動させられる。By switching to pumping operation, water flows into the annular suction passage 13.
The original plate is passed through the auxiliary suction pipe 8 to the impeller chamber 3, and the discharge pipe 4
is drained through. The water flow sucked into the annular suction passage 13 automatically rotates the plurality of valve plates 16 to the valve open position shown by the imaginary line.

一方、前記気中運転継続中に、ポンプ吸水井６への流入
水量の急増が予測され１例えば揚水遮断水位ＬＷＬを僅
かに越えた時点で排水を要請された場合には、気水切換
手段７を閉成して吸込管５（詳しくは環状通路１３の上
側）と大気との連通を遮断し、かつクラッチ１１をＯＮ
する。On the other hand, during the above-mentioned submerged operation, if a rapid increase in the amount of water flowing into the pump water intake well 6 is predicted and a request for drainage is made at the point when the pumping cut-off water level LWL is slightly exceeded, for example, the air/water switching means 7 is closed to cut off communication between the suction pipe 5 (more specifically, the upper side of the annular passage 13) and the atmosphere, and the clutch 11 is turned on.
do.

その結果、補助軸１２および補助羽根車ｌＯが回転し、
補助羽根車ｌＯにより水を汲みあげて補助吸込管８の上
端部開口から吸込管５内に吐出させる。この場合、弁装
置１４の弁板１６は環状吸込通路１３を閉塞しているの
で、補助吸込管８の上端部開口から吐出された水は、弁
装置１４の上部、つまり複数の弁板１６の上部にたまり
、比較的短時間で羽根車入口２Ａもしくはその近傍に達
して、羽根車２によって揚水運転されることになる。As a result, the auxiliary shaft 12 and the auxiliary impeller lO rotate,
Water is pumped up by the auxiliary impeller IO and discharged into the suction pipe 5 from the upper end opening of the auxiliary suction pipe 8. In this case, since the valve plate 16 of the valve device 14 closes the annular suction passage 13, the water discharged from the upper end opening of the auxiliary suction pipe 8 flows through the upper part of the valve device 14, that is, the plurality of valve plates 16. It accumulates in the upper part, reaches the impeller inlet 2A or its vicinity in a relatively short time, and is pumped by the impeller 2.

揚水運転に切換えられると、環状吸込通路１３に吸い込
まれる水流によって、複数の弁板１６は第３図の仮想線
で示す開弁位置に自動的に回動させられる。また、揚水
運転の開始直後にクラッチ１１をＯＦＦして補助軸１２
および補助羽根車１０の回転を停止させておけばよい。When switching to pumping operation, the plurality of valve plates 16 are automatically rotated to the valve open position shown by the phantom lines in FIG. 3 by the water flow sucked into the annular suction passage 13. In addition, immediately after the start of pumping operation, the clutch 11 is turned off and the auxiliary shaft 12
Then, the rotation of the auxiliary impeller 10 may be stopped.

このように、本考案によれば、支軸ポンプを固有の揚水
開始水位ＨＷＬよりも下位の任意の水位で先行して揚水
運転させることができる。したがって、揚水運転への切
換えタイミングに遅れを生じ、ポンプ吸水井６が溢水す
るような不都合の発生を確実に防止できる。As described above, according to the present invention, the spindle pump can be operated in advance at any water level lower than the specific pumping start water level HWL. Therefore, it is possible to reliably prevent inconveniences such as a delay in the timing of switching to pumping operation and overflowing of the pump suction well 6.

第４図は弁装置１４の変形例を示す、同図において、弁
装置１４は、吸込管５の内周に取付けられた筒状弾性部
材１７と、この筒状弾性部材１７の外周と吸込管５の内
周との間に形成される環状の密閉空間１８に高圧流体（
例えば圧縮空気）を供給する高圧流体供給系１９によっ
て構成され、筒状弾性部材１７は、例えばゴムのような
高弾性材によって比較的薄肉に形されており、高圧流体
供給系１９は流体供給源（例えばニアコンプレッサー）
１９Ａと、該流体供給源１９Ａと環状の密閉空間１８と
を互いに連通させる流体供給管１９Ｂおよび流体供給管
１９Ｂに介設されて環状の密閉空間１８を流体供給源１
９Ａもしくは大気に連通させる切換弁１９Ｃによって構
成されている。FIG. 4 shows a modification of the valve device 14. In the same figure, the valve device 14 includes a cylindrical elastic member 17 attached to the inner periphery of the suction pipe 5, and a cylindrical elastic member 17 attached to the outer periphery of the cylindrical elastic member 17 and the suction pipe. A high pressure fluid (
The cylindrical elastic member 17 is made of a highly elastic material such as rubber and has a relatively thin wall, and the high-pressure fluid supply system 19 is a fluid supply source. (e.g. near compressor)
19A, a fluid supply pipe 19B that communicates the fluid supply source 19A and the annular sealed space 18 with each other, and a fluid supply pipe 19B that connects the annular sealed space 18 to the fluid supply source 1
9A or a switching valve 19C that communicates with the atmosphere.

このように構成された弁装置１４は、切換弁１９Ｃの切
換え操作により流体供給源１９Ａと環状の密閉空間１８
とを連通させて、環状の密閉空間１８に高圧流体（圧縮
空気）を供給することで。The valve device 14 configured in this manner connects the fluid supply source 19A to the annular closed space 18 by switching the switching valve 19C.
By supplying high-pressure fluid (compressed air) to the annular closed space 18 by communicating with the

筒状弾性部材１７は仮想線で示すように弾性変形して補
助吸込管８の外周に圧接し、環状吸込通路１３を閉塞す
る。また、切換弁１９Ｃの切換え操作により環状の密閉
空間１８を大気に連通させることで、環状の密閉空間１
８内の圧縮空気は大気に放出され、筒状弾性部材１７が
実線で示すように弾性復帰して環状吸込通路１３を開放
することになる。したがって、複数の弁板１６によって
構成した前述の弁装置１４と同様の作用効果を奏するこ
とができる。The cylindrical elastic member 17 is elastically deformed as shown by the imaginary line and comes into pressure contact with the outer periphery of the auxiliary suction pipe 8, thereby closing the annular suction passage 13. In addition, by communicating the annular sealed space 18 with the atmosphere by switching the switching valve 19C, the annular sealed space 1
The compressed air in 8 is released to the atmosphere, and the cylindrical elastic member 17 elastically returns to open the annular suction passage 13 as shown by the solid line. Therefore, the same effects as the above-described valve device 14 configured by a plurality of valve plates 16 can be achieved.

（発明の効果） 本発明は、前述のように構成されているから、以下に記
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 has the following effects.

即ち、気中運転中において、支軸ポンプを固有の揚水開
始水位よりも下位の任意の水位で先行して揚水運転させ
ることができる。したがって、揚水運転への切換えタイ
ミングに遅れを生じ、ポンプ吸水井が溢水するような不
都合の発生を確実に防止できる。That is, during submerged operation, the spindle pump can be operated in advance at any water level lower than the specific pumping start water level. Therefore, it is possible to reliably prevent inconveniences such as a delay in the timing of switching to pumping operation and flooding of the pump suction well.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を適用した支軸ボン示す拡大
縦断正面図、第４図は弁装置の他の例を示す拡大縦断正
面図である。 １・・・主軸 ２・・・羽根車 ３・・・羽根車室 ４・・・吐出管 ５・・・吸込管 ８・・・補助吸込管 ｌＯ・・・補助羽根車 １２・・・補助軸 １３・・・環状吸込通路 １３・・・弁装置 特許出願人　　　株式会社　クボタ 化　理　人　　　弁理士　鈴江　孝− 第 図 夕 第 図 寥 図 第 図FIG. 1 is an enlarged longitudinal sectional front view showing a support shaft to which an embodiment of the present invention is applied, and FIG. 4 is an enlarged longitudinal sectional front view showing another example of the valve device. 1... Main shaft 2... Impeller 3... Impeller chamber 4... Discharge pipe 5... Suction pipe 8... Auxiliary suction pipe lO... Auxiliary impeller 12... Auxiliary shaft 13...Annular suction passage 13...Valve device patent applicant Kubota Kaisha Ltd. Patent attorney Takashi Suzue

Claims (1)

【特許請求の範囲】[Claims] （１）主軸に固着された羽根車が羽根車室に回転自在に
装入され、この羽根車室の上下に吐出管と吸込管がそれ
ぞれ連通接続された立軸ポンプにおいて、前記吸込管内
に上下両端部を開口した補助吸込管が配設され、この補
助吸込管の内部に補助羽根車が配置されており、該補助
羽根車がクラッチを介して前記主軸に接続された補助軸
に固着されるとともに、前記吸込管の内周と補助吸込管
の外周とで形成される環状吸込通路に、これを開閉する
弁装置が配設されていることを特徴とする立軸ポンプ。(1) In a vertical shaft pump in which an impeller fixed to the main shaft is rotatably inserted into an impeller chamber, and a discharge pipe and a suction pipe are connected to the upper and lower sides of the impeller chamber, both upper and lower ends are connected to the suction pipe. An auxiliary suction pipe with an open section is disposed, and an auxiliary impeller is disposed inside the auxiliary suction pipe, and the auxiliary impeller is fixed to an auxiliary shaft connected to the main shaft via a clutch. A vertical shaft pump, characterized in that a valve device for opening and closing the annular suction passage formed by the inner periphery of the suction pipe and the outer periphery of the auxiliary suction pipe is disposed.