JPH0612787U - Vertical pump - Google Patents
Vertical pumpInfo
- Publication number
- JPH0612787U JPH0612787U JP5189492U JP5189492U JPH0612787U JP H0612787 U JPH0612787 U JP H0612787U JP 5189492 U JP5189492 U JP 5189492U JP 5189492 U JP5189492 U JP 5189492U JP H0612787 U JPH0612787 U JP H0612787U
- Authority
- JP
- Japan
- Prior art keywords
- water level
- operable
- water
- pump
- minimum
- 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
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- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
(57)【要約】
【目的】 立軸ポンプPの大型化および設置スペ−ス上
の制約を回避して、従来の運転可能最低水位LWL以下
の領域まで排水運転できるようにする。
【構成】 吸込カバ−6の立軸ポンプP固有の運転可能
最低水位LWL以下の領域に複数の貫通孔11,11…
…を形成してある。
(57) [Summary] [Objective] The vertical pump P is allowed to be drained to a region below the minimum operable water level LWL of the prior art by avoiding the increase in size and restrictions on the installation space. [Structure] A plurality of through holes 11, 11 ... Are provided in a region below the operable minimum water level LWL peculiar to the vertical pump P of the suction cover 6.
Is formed.
Description
【0001】[0001]
本考案は立軸ポンプに係り、特に、従来の運転可能最低水位以下の水位での排 水を可能にさせたり、吸水井の底上げ構築を可能にした立軸ポンプに関する。 The present invention relates to a vertical shaft pump, and more particularly, to a vertical shaft pump that enables drainage at a water level lower than the minimum operable water level of the related art and enables construction of a raised bottom of an intake well.
【0002】[0002]
たとえば、図2に示す排水機場のポンプ吸水井1などに設置されている立軸ポ ンプPには、当該立軸ポンプP固有の運転可能最低水位LWLが存在し、吸水井 1の水位が運転可能最低水位LWL以下の領域において排水運転を行うと、渦が 発生して空気混じりの水を吸込むことになる。その結果、激しい振動や大きい騒 音を生じてポンプ運転機能障害を引き起こしたり、排水機場の基礎や建屋などを 損傷させるおそれがある。したがって、水位が運転可能最低水位LWLまで低下 した場合には、この水位LWLを検出して立軸ポンプPの運転を停止させたり、 あるいは羽根車室5に吸気管(図示せず)を備えている先行待機運転型立軸ポン プでは、吸気管に介設されている吸気弁(図示せず)を開いて、羽根車4を収容 している羽根車室5に吸気して揚水を遮断する運転制御がなされている。 For example, the vertical pump P installed in the pump water intake well 1 of the drainage pump station shown in FIG. 2 has the lowest operable water level LWL unique to the vertical pump P, and the water level of the water intake well 1 is the lowest operable. If the drainage operation is performed in the region below the water level LWL, a vortex will be generated and the air-mixed water will be sucked. As a result, violent vibrations and loud noises may occur, causing pump operation dysfunction and damaging the foundation and building of the drainage pump station. Therefore, when the water level drops to the lowest operable water level LWL, the water level LWL is detected to stop the operation of the vertical pump P, or the impeller chamber 5 is provided with an intake pipe (not shown). In the pre-standby operation type vertical pump, operation control is performed by opening an intake valve (not shown) provided in the intake pipe to intake the impeller chamber 5 accommodating the impeller 4 to cut off pumping. Has been done.
【0003】 ところが、運転可能最低水位LWLにおいて立軸ポンプPの運転を停止したり 、あるいは羽根車室4に吸気して揚水遮断する従来の運転制御では、吸水井1の 残水量が運転可能最低水位LWLから吸水井1の底1Aまでの深さD1(ポンプ の口径の概ね1.7倍)に相当することになり残水量が多くなる。そのために、 運転可能最低水位LWL以下の領域まで排水運転して吸水井1の底1Aまでの深 さを浅くし、残水量を少なくしたい要求がある。 このような要求を満足させるために、図3に示すように、羽根車室5の下側に 連通する吸込カバ−6の下側に吸込口の大きい拡大ベルマウス7を取付けた構造 の立軸ポンプPが提案されている。この立軸ポンプPによれば、吸込面積が大き くなるので吸込流速を低下させることになる。したがって、従来の運転可能最低 水位LWL以下の領域で排水運転しても渦が発生し難くなり、振動や騒音の発生 を有効に抑制することができる。しかし、吸込口が相当に大きい拡大ベルマウス 7を使用しなければならないので、立軸ポンプPが大型になり大きい設置スペ− スを必要とするため、設置スペ−ス上の制約をうける難点がある。However, in the conventional operation control in which the operation of the vertical pump P is stopped at the operable minimum water level LWL, or the intake water is sucked into the impeller chamber 4 and the pumping is cut off, the residual water amount of the water intake well 1 becomes the operable minimum water level. This corresponds to a depth D1 from the LWL to the bottom 1A of the water intake well 1 (approximately 1.7 times the bore of the pump), resulting in a large amount of residual water. Therefore, there is a demand to reduce the residual water amount by performing drainage operation to a region below the minimum operable water level LWL to make the depth to the bottom 1A of the water intake well 1 shallow. In order to satisfy such requirements, as shown in FIG. 3, a vertical shaft pump having a structure in which an enlarged bell mouth 7 having a large suction port is attached to the lower side of the suction cover 6 communicating with the lower side of the impeller chamber 5. P is proposed. According to this vertical shaft pump P, since the suction area becomes large, the suction flow velocity is reduced. Therefore, even if the drainage operation is performed in a region below the conventional operable minimum water level LWL, vortices are less likely to occur, and vibration and noise can be effectively suppressed. However, since the expanded bell mouth 7 having a considerably large suction port must be used, the vertical shaft pump P becomes large and requires a large installation space. Therefore, there is a problem in that the installation space is restricted. .
【0004】[0004]
解決しようとする問題点は、従来の運転可能最低水位以下の領域まで排水運転 する要求を満足させようとしても、従来提案されている立軸ポンプでは、大型に なり大きい設置スペ−スを必要とするため、設置スペ−ス上の制約をうけて実施 不能になる点である。 The problem to be solved is that even if it is attempted to satisfy the requirement for drainage operation to a region below the conventional minimum operable water level, the conventionally proposed vertical pump requires a large size and a large installation space. Therefore, it is impossible to implement due to restrictions on the installation space.
【0005】[0005]
本考案は、羽根車室の下側に連通する吸込カバ−を設けた立軸ポンプにおいて 、前記吸込カバ−における当該立軸ポンプ固有の運転可能最低水位以下の領域に 複数の貫通孔が形成されていることを特徴とし、立軸ポンプの大型化および設置 スペ−ス上の制約を回避して、従来の運転可能最低水位以下の領域まで排水運転 できるようにする目的を達成した。 The present invention relates to a vertical shaft pump provided with a suction cover communicating with the lower side of the impeller chamber, wherein a plurality of through holes are formed in a region of the suction cover below a minimum operable water level specific to the vertical shaft pump. With the above features, the objective of enabling upsizing of vertical shaft pumps and avoiding restrictions on installation space to be able to perform drainage operation to a region below the conventional minimum operable water level was achieved.
【0006】[0006]
本考案によれば、吸水井の水位が従来の運転可能最低水位以下になっても、吸 込カバ−の吸込口のみでなく運転可能最低水位以下の領域に形成されている複数 の貫通孔からも水が吸込まれるので、前記吸込口からの吸込流速が低下する。し たがって、従来の運転可能最低水位以下の領域で排水運転しても渦が発生し難く なり、振動や騒音の発生を有効に抑制することができる。 また、前記複数の貫通孔の一部が水面上に露出した場合においても、複数の貫 通孔を吸込カバ−の全周に均等に形成しておけば、従来の運転可能最低水位以下 の領域では、羽根車室内の羽根車に対して空気が周方向均等に分散された状態で 流入することになる。このため、羽根車に対する揚水の質量の均一化が図られる ので、空気吸込による振動や騒音の発生を有効に抑制することができる。 According to the present invention, even if the water level of the intake well becomes lower than the conventional operable minimum water level, not only the intake port of the suction cover but also the plurality of through holes formed in the region below the operable minimum water level. Since water is also sucked in, the suction flow rate from the suction port is reduced. Therefore, vortexes are less likely to occur even when the drainage operation is performed in the region below the conventional minimum operable water level, and vibration and noise can be effectively suppressed. Even if some of the plurality of through holes are exposed above the water surface, if the plurality of through holes are evenly formed around the entire circumference of the suction cover, the area below the minimum operable water level of the conventional case will be obtained. Then, the air flows into the impeller inside the impeller chamber in a state where the air is evenly dispersed in the circumferential direction. Therefore, since the mass of pumped water with respect to the impeller can be made uniform, it is possible to effectively suppress the generation of vibration and noise due to air suction.
【0007】[0007]
以下、本考案の実施例を図面に基づいて説明する。図1は本考案に係る立軸ポ ンプの一例を示す概略構成図であり、前記従来例と同一もしくは相当部分には同 一符号を付して説明する。 この図において、羽根車4を軸支して回転自在に収納している羽根車室5の下 側、つまり上流側に吸込カバ−6が連通して接続され、羽根車室5の上側(下流 側)に揚水管8が接続されており、この揚水管8の下流にエルボ9および吐出弁 10が直列に接続されて立軸ポンプPを構成し吸水井1に設置されている。 吸込カバ−6の吸込口は通常の大きさ(概ねポンプ口径の1.4倍)に設定さ れ、立軸ポンプP固有の従来の運転可能最低水位LWL以下の領域に複数の貫通 孔11,11……が全周均等に形成されている。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an example of a vertical shaft pump according to the present invention. The same or corresponding parts as those of the conventional example will be described with the same reference numerals. In this figure, a suction cover 6 is connected in communication with the lower side of the impeller chamber 5 which rotatably accommodates the impeller 4 and is rotatably accommodated therein, and the upper side of the impeller chamber 5 (downstream). A pumping pipe 8 is connected to the side), and an elbow 9 and a discharge valve 10 are connected in series downstream of the pumping pipe 8 to form a vertical pump P, which is installed in the water intake well 1. The suction port of the suction cover 6 is set to a normal size (approximately 1.4 times the pump diameter), and a plurality of through holes 11, 11 are provided in the region below the conventional operable minimum water level LWL peculiar to the vertical shaft pump P. ... are formed evenly around the entire circumference.
【0008】 このような構成であれば、吸水井1の水位が従来の運転可能最低水位LWL以 上の領域では、水は吸込カバ−6の吸込口6Aおよび複数の貫通孔11,11… …から吸込まれて、揚水運転(排水運転)がなされる。 一方、吸水井1の水位が従来の運転可能最低水位LWL以下に低下しても、吸 込カバ−6の吸込口6Aのみでなく複数の貫通孔11,11……からも水が吸込 まれるので、吸込口6Aからの吸込流速が低下する。したがって、従来の運転可 能最低水位LWL以下の領域で排水運転しても渦が発生し難くなり、振動や騒音 を有効に抑制することができるから、従来の運転可能最低水位LWL以下の領域 での排水運転が可能になる。そのために、吸水井1の残水量が従来の運転可能最 低水位LWLよりも下位のレベルから吸水井1の底1Aまでの深さに相当して浅 くなり残水量を低減することができる。また、排水停止水位を同一レベルに設定 した場合には、吸水井1の底1Aを上げて吸水井1を浅くできるので、吸水井1 構築のための土木費用を大幅に低減することができる。しかも、従来の立軸ポン プPのように、拡大ベルマウス7を必要としないので構造がシンプルになり、設 置スペ−スが小さくてよいから設置スペ−ス上の制約をうけることはない。 他方、複数の貫通孔11,11……を吸込カバ−6の全周に均等に形成してあ るから、従来の運転可能最低水位LWL以下の領域において、水面上に露出した 貫通孔11,11……より空気を吸込んだとしても、羽根車室5内の羽根車4に 対して空気が周方向均等に分散された状態で流入することになる。このため、羽 根車4に対する揚水の質量の均一化が図られるので、空気の吸込みによる振動や 騒音の発生を有効に抑制することができる。With such a configuration, in a region where the water level of the water intake well 1 is higher than the conventional operable minimum water level LWL, water is sucked into the suction port 6A of the suction cover 6 and the plurality of through holes 11, 11 ... It is sucked in from and is pumped up (drained). On the other hand, even if the water level of the water intake well 1 falls below the conventional operable minimum water level LWL, water is sucked not only from the suction port 6A of the suction cover 6 but also from the plurality of through holes 11, 11 ... Therefore, the suction flow rate from the suction port 6A decreases. Therefore, eddies are less likely to be generated even if the drainage operation is performed in the area below the conventional operable minimum water level LWL, and vibration and noise can be effectively suppressed, so that in the area below the conventional operable minimum water level LWL. It becomes possible to perform drainage operation. Therefore, the residual water amount in the water intake well 1 becomes shallow corresponding to the depth from the lower level than the conventional operable minimum water level LWL to the bottom 1A of the water intake well 1, and the residual water amount can be reduced. Further, if the drainage stop water level is set to the same level, the bottom 1A of the water intake well 1 can be raised to make the water intake well 1 shallow, so the civil engineering cost for constructing the water intake well 1 can be significantly reduced. Moreover, unlike the conventional vertical pump P, since the enlarged bell mouth 7 is not required, the structure is simple and the installation space can be small, so that there is no restriction on the installation space. On the other hand, since the plurality of through holes 11, 11 ... Are evenly formed around the entire circumference of the suction cover 6, the through holes 11 exposed on the water surface in the region below the conventional operable minimum water level LWL. 11 ... Even if air is sucked in, the air will flow into the impeller 4 in the impeller chamber 5 in a state where the air is evenly dispersed in the circumferential direction. As a result, the mass of pumped water with respect to the vane wheel 4 can be made uniform, so that it is possible to effectively suppress the generation of vibration and noise due to the intake of air.
【0009】 前記実施例では、通常の立軸ポンプPについて説明しているが、たとえば、吸 気管および吸気管に介設された吸気弁を備えている先行待機運転型立軸ポンプに 適用できることはいうまでもない。また、複数の貫通孔11,11……の形状は 任意である。In the above-mentioned embodiment, the normal vertical pump P is explained, but it goes without saying that it can be applied to a preceding standby operation type vertical pump provided with an intake pipe and an intake valve provided in the intake pipe. Nor. The shape of the plurality of through holes 11, 11, ... Is arbitrary.
【0010】[0010]
以上説明したように、本考案は、立軸ポンプの大型化および設置スペ−ス上の 制約を回避して、従来の運転可能最低水位以下の領域まで排水運転することがで るので、残水量を低減できるとともに、排水停止水位を同一レベルに設定した場 合には、吸水井の底を上げて吸水井を浅くすることが可能になり、吸水井構築の ための土木費用を大幅に低減することができる。 As explained above, according to the present invention, it is possible to perform drainage operation to a region below the conventional minimum operable water level by avoiding the increase in size of the vertical shaft pump and restrictions on the installation space. In addition to being able to reduce the water level, if the drainage stop water level is set to the same level, it will be possible to raise the bottom of the suction well to make it shallower, and significantly reduce the civil engineering cost for construction of the suction well. You can
【図1】本考案の実施例を示す概略構成図である。FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.
【図2】従来例を示す概略構成図である。FIG. 2 is a schematic configuration diagram showing a conventional example.
【図3】従来の他の例を示す概略構成図である。FIG. 3 is a schematic configuration diagram showing another conventional example.
1 吸水井 4 羽根車 5 羽根車室 6 吸込カバ− 11 貫通孔 P 立軸ポンプ LWL 運転可能最低水位 1 Water well 4 Impeller 5 Impeller chamber 6 Suction cover 11 Through hole P Vertical shaft pump LWL Operable minimum water level
Claims (1)
設けた立軸ポンプにおいて、前記吸込カバ−における当
該立軸ポンプ固有の運転可能最低水位以下の領域に複数
の貫通孔が形成されていることを特徴とする立軸ポン
プ。1. A vertical shaft pump provided with a suction cover communicating with the lower side of an impeller chamber, wherein a plurality of through holes are formed in a region of the suction cover below an operable minimum water level peculiar to the vertical shaft pump. Vertical shaft pump characterized by having.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5189492U JPH0612787U (en) | 1992-07-23 | 1992-07-23 | Vertical pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5189492U JPH0612787U (en) | 1992-07-23 | 1992-07-23 | Vertical pump |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0612787U true JPH0612787U (en) | 1994-02-18 |
Family
ID=12899590
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5189492U Pending JPH0612787U (en) | 1992-07-23 | 1992-07-23 | Vertical pump |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0612787U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2021067252A (en) * | 2019-10-28 | 2021-04-30 | 株式会社酉島製作所 | pump |
-
1992
- 1992-07-23 JP JP5189492U patent/JPH0612787U/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2021067252A (en) * | 2019-10-28 | 2021-04-30 | 株式会社酉島製作所 | pump |
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