JP2008088905A - Vertical shaft pump - Google Patents

Vertical shaft pump Download PDF

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JP2008088905A
JP2008088905A JP2006271093A JP2006271093A JP2008088905A JP 2008088905 A JP2008088905 A JP 2008088905A JP 2006271093 A JP2006271093 A JP 2006271093A JP 2006271093 A JP2006271093 A JP 2006271093A JP 2008088905 A JP2008088905 A JP 2008088905A
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rectifying plate
bend pipe
plate
rectifying
vertical shaft
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JP4770681B2 (en
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Noriaki Hamada
紀昭 浜田
Toshinori Ishii
憲法 石居
Shigeyoshi Ono
滋義 小野
Ichiro Harada
一郎 原田
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Hitachi Plant Technologies Ltd
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Hitachi Plant Technologies Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical shaft pump capable of reducing a water passage loss. <P>SOLUTION: The vertical shaft pump is equipped with: an impeller 2; a casing 3 containing the impeller 2 therein; a bend pipe 5 connected to the downstream side of the casing 3; a rotary shaft 8 rotatably provided in the casing 3 and the bend pipe 5, having the impeller 2 attached to its lower end; and a protecting pipe 14 covering the periphery of the rotary shaft 8. The bend pipe 5 includes a first rectifying plate 15 provided further toward the inner side than a central line 0 of the bend pipe 5, and a second rectifying plate 16 provided shifted to the downstream side and to the inner side than the first rectifying plate 15 to form a gap 18 between the first and second rectifying plates 15, 16. The downstream side end of the first rectifying plate 15 has a shape for generating a width-direction component of the first rectifying plate 15 in the flow passing through the gap 18 between the first rectifying plate 15 and the second rectifying plate 16. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、排水機場等に設置された立軸ポンプに関する。   The present invention relates to a vertical shaft pump installed in a drainage station or the like.

排水機場等に設置される立軸ポンプは、羽根車と、この羽根車を内包するケーシングと、このケーシングの下流側に接続されたベンド管と、ケーシング及びベンド管内に軸受装置を介し回転可能に設けられ、下端部に羽根車を取付けた回転軸と、この回転軸を覆う保護管と、ベンド管の上方側に突出する回転軸の上端部に接続された原動機とを備えている。この立軸ポンプにおいては、大型化を招くのを防ぐため、ベンド管の曲率半径を十分に確保することが難しい。このような場合、ベンド管の曲がり内側壁面に沿って流れる水流に剥離が生じ、水路損失（混合損失）が増加するため、ポンプ性能が低下してしまう。そこで、ベンド管の中心線より内側に整流板を設けた構造が提唱されている（例えば、特許文献１参照）。これにより、ベンド管の曲がり内側壁面に沿って流れる水流における剥離を抑え、水路損失の低減を図るようになっている。   A vertical shaft pump installed in a drainage station or the like is provided with an impeller, a casing containing the impeller, a bend pipe connected to the downstream side of the casing, and a casing and the bend pipe rotatably provided with a bearing device. A rotating shaft having an impeller attached to the lower end, a protective tube covering the rotating shaft, and a prime mover connected to the upper end of the rotating shaft protruding above the bend tube. In this vertical shaft pump, it is difficult to ensure a sufficient radius of curvature of the bend pipe in order to prevent an increase in size. In such a case, separation occurs in the water flow flowing along the bent inner wall surface of the bend pipe, and the water channel loss (mixing loss) increases, so that the pump performance is deteriorated. Therefore, a structure in which a current plate is provided on the inner side of the center line of the bend pipe has been proposed (for example, see Patent Document 1). Thereby, separation in the water flow flowing along the bent inner wall surface of the bend pipe is suppressed, and the water channel loss is reduced.

特開２００４−２７９９９号公報JP 2004-27999 A

しかしながら、上記従来技術には以下のような改善の余地があった。
すなわち、上記整流板の曲率半径を十分に確保することが難しいことがあり、このような場合には整流板の外周面に沿って流れる水流に剥離が生じ、水路損失（混合損失）が増加する。そのため、整流板の外周面に沿って流れる水流における剥離を抑え、水路損失の低減を図る点で、改善の余地があった。 However, the above prior art has room for improvement as follows.
That is, it may be difficult to ensure a sufficient radius of curvature of the rectifying plate. In such a case, separation occurs in the water flow that flows along the outer peripheral surface of the rectifying plate, and water channel loss (mixing loss) increases. . Therefore, there is room for improvement in terms of suppressing separation in the water flow that flows along the outer peripheral surface of the current plate and reducing water channel loss.

本発明は、上記の事柄に基づいてなされたものであり、その目的は、水路損失の低減を図ることができる立軸ポンプを提供することにある。   This invention is made | formed based on said matter, The objective is to provide the vertical shaft pump which can aim at reduction of a channel loss.

（１）上記目的を達成するために、本発明は、羽根車と、前記羽根車を内包するケーシングと、前記ケーシングの下流側に接続されたベンド管と、前記ケーシング及びベンド管内に回転可能に設けられ、前記羽根車に接続した回転軸と、前記回転軸の周囲を覆う保護管とを備えた立軸ポンプにおいて、前記ベンド管は、前記ベンド管の中心線より内側に設けた第１の整流板と、前記第１の整流板との間に隙間を形成するように、前記第１の整流板の下流側かつ内側にずらして設けた第２の整流板とを有し、前記第１の整流板の下流側端部は、前記第１の整流板と前記第２の整流板との間の隙間を通過する流れに前記第１の整流板の幅方向成分を生じさせる形状とする。   (1) To achieve the above object, the present invention provides an impeller, a casing containing the impeller, a bend pipe connected to the downstream side of the casing, and rotatable in the casing and the bend pipe. A vertical shaft pump provided with a rotary shaft connected to the impeller and a protective pipe covering the circumference of the rotary shaft, wherein the bend pipe is a first rectification provided inside a center line of the bend pipe And a second rectifying plate provided on the downstream side and the inside of the first rectifying plate so as to form a gap between the first rectifying plate and the first rectifying plate. The downstream end of the rectifying plate has a shape that generates a width direction component of the first rectifying plate in the flow passing through the gap between the first rectifying plate and the second rectifying plate.

本発明においては、ベンド管の中心線より内側に設けた第１の整流板と、この第１の整流板との間に隙間を形成するように、第１の整流板の下流側かつ内側にずらして設けた第２の整流板とを有している。これにより、第１の整流板の内周面に沿って流れた流体は、第１の整流板と第２の整流板との間の隙間を通じて第２の整流板の外側領域に流入し、第２の整流板の外周面に沿って流れる。すなわち、第１の整流板の内側のエネルギーの高い流れを、第２の整流板の外側領域に付与することができる。これにより、第２の整流板の外周面に沿って流れる水流における剥離を抑え、さらには、上流側の第１の整流板の外周面に沿って流れる水流における剥離を抑える効果も有し、水路損失を低減することができる。   In the present invention, on the downstream side and the inside of the first rectifying plate, a gap is formed between the first rectifying plate provided on the inner side of the center line of the bend pipe and the first rectifying plate. And a second rectifying plate provided in a shifted manner. Thereby, the fluid that flows along the inner peripheral surface of the first rectifying plate flows into the outer region of the second rectifying plate through the gap between the first rectifying plate and the second rectifying plate, 2 flows along the outer peripheral surface of the current plate. That is, a high energy flow inside the first rectifying plate can be applied to the outer region of the second rectifying plate. This suppresses separation in the water flow flowing along the outer peripheral surface of the second rectifying plate, and further has an effect of suppressing separation in the water flow flowing along the outer peripheral surface of the upstream first rectifying plate. Loss can be reduced.

また、ベンド管のような曲がり流路では、流体に作用する遠心力により流路断面に二次流れが生じている。そして、第１の整流板と第２の整流板との間の隙間を通過する流れと保護管の後流域の流れとの影響により、第１及び第２の整流板の外側領域に低速領域が生じ、この低速領域が大きいと水路損失（混合損失）が増加してしまう。そこで本発明においては、第１の整流板の下流側端部は、例えば円弧状、若しくは第１の整流板の幅方向に傾斜した斜辺を有する形状などに形成し、これによって第１の整流板と第２の整流板との間の隙間を通過する流れに第１の整流板の幅方向成分を生じさせる。この幅方向成分の流れにより第１及び第２の整流板の外側領域における二次流れが促進され、二次流れにより低速領域を小さくすることができる。したがって、水路損失をさらに低減することができる。   Further, in a curved flow path such as a bend pipe, a secondary flow is generated in the cross section of the flow path due to centrifugal force acting on the fluid. Then, due to the influence of the flow passing through the gap between the first rectifying plate and the second rectifying plate and the flow in the downstream area of the protective tube, a low speed region is formed in the outer region of the first and second rectifying plates. If this low speed region is large, water channel loss (mixing loss) will increase. Therefore, in the present invention, the downstream side end portion of the first rectifying plate is formed in, for example, an arc shape or a shape having a hypotenuse inclined in the width direction of the first rectifying plate, whereby the first rectifying plate is formed. A component in the width direction of the first current plate is generated in the flow passing through the gap between the first current plate and the second current plate. The flow in the width direction component promotes the secondary flow in the outer region of the first and second rectifying plates, and the low speed region can be reduced by the secondary flow. Therefore, the water channel loss can be further reduced.

（２）上記（１）において、好ましくは、前記第１の整流板の下流側段部は、円弧状に形成する。   (2) In the above (1), preferably, the downstream step portion of the first rectifying plate is formed in an arc shape.

（３）上記（１）において、好ましくは、前記第１の整流板の下流側端部は、前記第１の整流板の幅方向に傾斜した斜辺を有する形状に形成する。   (3) In the above (1), preferably, the downstream end of the first rectifying plate is formed in a shape having a hypotenuse inclined in the width direction of the first rectifying plate.

本発明によれば、第１の整流板の内周面に沿って流れた流体は、第１の整流板と第２の整流板との間の隙間を通じて第２の整流板の外側領域に流入し、第２の整流板の外周面に沿って流れる。これにより、第２の整流板の外周面に沿って流れる水流における剥離を抑え、水路損失を低減することができる。また、第１の整流板と第２の整流板との間の隙間を通過する流れに第１の整流板の幅方向成分を生じさせることにより、第１及び第２の整流板の外側領域における二次流れが促進され、二次流れにより低速領域を狭めることができる。したがって、水路損失をさらに低減することができる。   According to the present invention, the fluid flowing along the inner peripheral surface of the first rectifying plate flows into the outer region of the second rectifying plate through the gap between the first rectifying plate and the second rectifying plate. And flows along the outer peripheral surface of the second current plate. Thereby, peeling in the water flow which flows along the outer peripheral surface of a 2nd baffle plate can be suppressed, and a water channel loss can be reduced. Further, by generating a width direction component of the first rectifying plate in the flow passing through the gap between the first rectifying plate and the second rectifying plate, in the outer region of the first and second rectifying plates The secondary flow is promoted and the low speed region can be narrowed by the secondary flow. Therefore, the water channel loss can be further reduced.

以下、本発明の一実施形態を、図面を参照しつつ説明する。
図１は、本発明の立軸ポンプの一実施形態の全体構造を表す断面図であり、図２は、図１中断面II−IIによる断面図であり、図３は、断面III−IIIによる断面図である。また、図４は、後述する第１の整流板と第２の整流板との間の隙間を通過する流れを表す図（但し、便宜上、第２の整流板を図示せず）であり、図５は、図１中断面Ｖ−Ｖにおける流路断面の二次流れを表す図である。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing the overall structure of an embodiment of a vertical pump according to the present invention, FIG. 2 is a cross-sectional view taken along section II-II in FIG. 1, and FIG. FIG. FIG. 4 is a diagram showing a flow passing through a gap between a first rectifying plate and a second rectifying plate, which will be described later (however, for convenience, the second rectifying plate is not shown). FIG. 5 is a diagram illustrating a secondary flow of the cross section of the flow path at the cross section VV in FIG. 1.

これら図１〜図５において、立軸ポンプ１は、例えば排水機場に設置された軸流ポンプであり、羽根車２と、この羽根車２を内包する例えば円筒状のケーシング３と、このケーシング３の上流側（図１中下側）に接続された吸込ベルマウス４と、ケーシング３の下流側（図１中上側）に接続されたベンド管５と、このベンド管５の下流側（図１中右側）に接続された排水管６と、ケーシング３及びベンド管５内に軸受７を介し回転可能に設けられ、下端部に羽根車２を取付けた回転軸（シャフト）８と、ベンド管５の上方側に突出する回転軸７の上端部に接続された原動機（図示せず）とを備えている。そして、原動機の駆動によって回転軸８を介し羽根車２が回転すると、吸水路９から吸込ベルマウス４を介しケーシング３内に流入した水を昇圧して、ベンド管５及び排水管６を介し放水路（図示せず）へ排出するようになっている。   In FIG. 1 to FIG. 5, the vertical shaft pump 1 is, for example, an axial flow pump installed in a drainage station, and includes an impeller 2, a cylindrical casing 3 containing the impeller 2, and the casing 3. A suction bell mouth 4 connected to the upstream side (lower side in FIG. 1), a bend pipe 5 connected to the downstream side (upper side in FIG. 1) of the casing 3, and a downstream side of the bend pipe 5 (in FIG. 1) A drainage pipe 6 connected to the right side), a rotary shaft (shaft) 8 which is rotatably provided in the casing 3 and the bend pipe 5 via a bearing 7 and has an impeller 2 attached to the lower end thereof; And a prime mover (not shown) connected to the upper end portion of the rotary shaft 7 protruding upward. When the impeller 2 rotates through the rotary shaft 8 by driving the prime mover, the pressure of the water flowing into the casing 3 through the suction bell mouth 4 from the water suction passage 9 is increased and released through the bend pipe 5 and the drain pipe 6. It is designed to be discharged into a water channel (not shown).

吸込ベルマウス４の中心部には吸込コーン１０が設けられ、この吸込コーン１０と吸込ベルマウス４との間に複数の案内羽根１１が設けられている。また、ケーシング３の中心部における羽根車２の下流側には、軸受７を収納する軸受スリーブ１２が設けられており、この軸受スリーブ１２とケーシング３との間に複数の案内羽根１３が設けられている。また、ベンド管５内には軸受スリーブ１２に接続された保護管１４が設けられており、軸受スリーブ１２及び保護管１４は回転軸８の周囲を覆うようになっている。   A suction cone 10 is provided at the center of the suction bell mouth 4, and a plurality of guide vanes 11 are provided between the suction cone 10 and the suction bell mouth 4. A bearing sleeve 12 that houses the bearing 7 is provided on the downstream side of the impeller 2 at the center of the casing 3, and a plurality of guide vanes 13 are provided between the bearing sleeve 12 and the casing 3. ing. A protective tube 14 connected to the bearing sleeve 12 is provided in the bend tube 5, and the bearing sleeve 12 and the protective tube 14 cover the periphery of the rotating shaft 8.

本実施形態の要部であるベンド管５は、例えば流路断面が円形状で９０度に曲げられた構造となっている。そして、ベンド管５の内部には、ベンド管５の中心線Ｏより内側に設けた第１の整流板１５と、この第１の整流板１５の下流側かつ内側にずらして設けた第２の整流板１６とが設けられている。   The bend pipe 5 which is a main part of the present embodiment has, for example, a circular channel cross section and a structure bent at 90 degrees. In the bend pipe 5, a first rectifying plate 15 provided on the inner side of the center line O of the bend pipe 5 and a second rectifying plate provided on the downstream side and inside of the first rectifying plate 15 are provided. A rectifying plate 16 is provided.

第１の整流板１５は、下流側端部が円弧状となる半円板をベンド管５の曲げ方向に沿って湾曲するように形成されており、その曲率半径Ｒ１がベンド管５の中心線Ｏの曲率半径Ｒ０より小さくなっている。また、第１の整流板１５は、上流側端部が保護管１４から離間するとともにその２角がベンド管５の管壁に溶接され、下流側端部の中央が支持棒１７を介し保護管１４に接続されている。このような第１の整流板１５の支持構造とすることにより、ベンド管５内の流れの影響による第１の整流板１５の振動を抑えるようになっている。なお、支持棒１７の断面形状は、図３に示すように、流体抵抗が小さくなるように、例えば上流側が比較的大きな円弧状、下流側が比較的小さな円弧状となるように形成されている。   The first rectifying plate 15 is formed so that a semicircular plate having a circular end at the downstream end is curved along the bending direction of the bend tube 5, and the radius of curvature R 1 is the center line of the bend tube 5. The curvature radius of O is smaller than R0. The first rectifying plate 15 has an upstream end spaced from the protective tube 14 and two corners thereof welded to the tube wall of the bend tube 5, and the center of the downstream end is protected via the support rod 17. 14. By adopting such a support structure for the first rectifying plate 15, vibration of the first rectifying plate 15 due to the influence of the flow in the bend pipe 5 is suppressed. As shown in FIG. 3, the cross-sectional shape of the support rod 17 is formed so that, for example, the upstream side has a relatively large arc shape and the downstream side has a relatively small arc shape so as to reduce the fluid resistance.

第２の整流板１６は、上流側端部が第１の整流板１５の下流側端部に対応するように円弧状に切り欠いた板をベンド管５の曲げ方向に沿って湾曲するように形成されており、その曲率半径Ｒ２が第１の整流板１５の曲率半径Ｒ１より小さくなっている。そして、第２の整流板１６の上流側端部は、例えば第１の整流板１５の下流側端部よりベンド管５の曲げ方向に離間しており、第１の整流板１５と第２の整流板１６との間に隙間１８が形成されている。   The second rectifying plate 16 is curved along the bending direction of the bend pipe 5 with a plate cut out in an arc shape so that the upstream end corresponds to the downstream end of the first rectifying plate 15. The radius of curvature R2 is smaller than the radius of curvature R1 of the first current plate 15. The upstream end portion of the second rectifying plate 16 is, for example, separated from the downstream end portion of the first rectifying plate 15 in the bending direction of the bend pipe 5, and the first rectifying plate 15 and the second rectifying plate 15 are separated from each other. A gap 18 is formed between the current plate 16 and the current plate 16.

このように構成された本実施形態においては、第１の整流板１５の内周面に沿って流れた流体は、第１の整流板１５と第２の整流板１６との間の隙間１８を通じて第２の整流板１６の外側領域に流入し、第２の整流板１６の外周面に沿って流れる（図１中矢印Ａで図示）。すなわち、第１の整流板１５の内側のエネルギーの高い流れを、第２の整流板１６の外側領域に付与することができる。これにより、第２の整流板１６の外周面に沿って流れる水流における剥離を抑え、さらには、上流側の第１の整流板１５の外周面に沿って流れる水流における剥離を抑える効果も有し、水路損失を低減することができる。   In the present embodiment configured as described above, the fluid flowing along the inner peripheral surface of the first rectifying plate 15 passes through the gap 18 between the first rectifying plate 15 and the second rectifying plate 16. It flows into the outer region of the second rectifying plate 16 and flows along the outer peripheral surface of the second rectifying plate 16 (shown by an arrow A in FIG. 1). That is, a high energy flow inside the first rectifying plate 15 can be applied to the outer region of the second rectifying plate 16. This suppresses separation in the water flow that flows along the outer peripheral surface of the second rectifying plate 16, and further has an effect of suppressing separation in the water flow that flows along the outer peripheral surface of the first rectifying plate 15 on the upstream side. Can reduce water channel loss.

また、本実施形態においては、第１の整流板１５の下流側端部を円弧状に形成することにより、図４に示すように、第１の整流板１５と第２の整流板１６との間の隙間１８を通過する流れに第１の整流板１５の幅方向成分Ｂを生じさせる（言い換えれば、流れの自由度を増加させる）。その作用効果を、比較例を用いて以下説明する。   Further, in the present embodiment, by forming the downstream end portion of the first rectifying plate 15 in an arc shape, the first rectifying plate 15 and the second rectifying plate 16 are connected as shown in FIG. A width direction component B of the first rectifying plate 15 is generated in the flow passing through the gap 18 (in other words, the degree of freedom of flow is increased). The effect will be described below using a comparative example.

図６は、比較例による第１及び第２の整流板の構造を表す図であり、上述の図２に相当するものである。また、図７は、比較例における第１の整流板と第２の整流板との間の隙間を通過する流れを表す図（但し、便宜上、第２の整流板を図示せず）であり、上述の図４に相当するものである。また、図８は、比較例における流路断面の二次流れを表す図であり、上述の図５に相当するものである。   FIG. 6 is a diagram illustrating the structures of the first and second rectifying plates according to the comparative example, and corresponds to FIG. 2 described above. FIG. 7 is a diagram showing a flow passing through the gap between the first rectifying plate and the second rectifying plate in the comparative example (however, for convenience, the second rectifying plate is not shown), This corresponds to FIG. 4 described above. Moreover, FIG. 8 is a figure showing the secondary flow of the flow-path cross section in a comparative example, and is equivalent to the above-mentioned FIG.

これら図６〜図８に示す比較例では、上記一実施形態同様、ベンド管５の内部には、ベンド管５の中心線Ｏより内側に設けた第１の整流板１９と、この第１の整流板１９との間に隙間２０を形成するように、第１の整流板１９の下流側かつ内側にずらして設けた第２の整流板２１とが設けられている。ところが、上記一実施形態とは異なり、第１の整流板１９の下流側端部及び第２整流板２１の上流側端部は直線状に形成されている。そのため、第１の整流板１９と第２の整流板２１との間の隙間２０を通過する流れは、ほぼベンド管５の曲げ方向（図７中右方向）のみとなる。そして、第１の整流板１９と第２の整流板２１との間の隙間２０を通過する流れと保護管１４の後流域の流れＣとの影響により、第１の整流板１９の外側領域には低速領域Ｄ１が生じ、この低速領域Ｄ１は比較的大きくなっている（図８参照）。   In the comparative examples shown in FIG. 6 to FIG. 8, similarly to the above-described embodiment, the bend pipe 5 includes the first rectifying plate 19 provided on the inner side of the center line O of the bend pipe 5, and the first A second rectifying plate 21 is provided so as to be shifted downstream and inward from the first rectifying plate 19 so as to form a gap 20 with the rectifying plate 19. However, unlike the above-described embodiment, the downstream end of the first rectifying plate 19 and the upstream end of the second rectifying plate 21 are formed in a straight line. Therefore, the flow passing through the gap 20 between the first rectifying plate 19 and the second rectifying plate 21 is substantially only in the bending direction of the bend pipe 5 (right direction in FIG. 7). Then, due to the influence of the flow passing through the gap 20 between the first rectifying plate 19 and the second rectifying plate 21 and the flow C in the downstream area of the protective tube 14, the outer region of the first rectifying plate 19 Has a low speed region D1, which is relatively large (see FIG. 8).

これに対し本実施形態では、第１の整流板１５の下流側端部を円弧状に形成することにより、第１の整流板１５と第２の整流板１６との間の隙間１８を通過する流れに第１の整流板１５の幅方向成分（二次流れ成分）を生じさせている。この幅方向成分の流れにより第１の整流板１５の外側領域における二次流れが促進され、流路断面の中心部を流れる二次流れＥが生じ、二次流れにより低速領域Ｄ２を小さくすることができる（図５参照）。したがって本実施形態においては、水路損失をさらに低減することができる。   On the other hand, in the present embodiment, the downstream end portion of the first rectifying plate 15 is formed in an arc shape so as to pass through the gap 18 between the first rectifying plate 15 and the second rectifying plate 16. A width direction component (secondary flow component) of the first rectifying plate 15 is generated in the flow. The secondary flow in the outer region of the first rectifying plate 15 is promoted by the flow in the width direction component, the secondary flow E flowing in the center of the flow path cross section is generated, and the low speed region D2 is reduced by the secondary flow. (See FIG. 5). Therefore, in this embodiment, water channel loss can be further reduced.

なお、上記一実施形態においては、第１の整流板１５の下流側端部を円弧状に形成した場合を例にとって説明したが、これに限られない。すなわち、例えば第１の整流板１５の幅方向に傾斜した斜辺を有する形状に形成してもよい。具体例を挙げると、図１０に示すように、第１の整流板１５Ａの下流側端部を三角状に形成し、これに対応して第２の上流側端部を三角状に切り欠くように形成してもよい。このような変形例においても、上記一実施形態同様の効果を得ることができる。   In the above embodiment, the case where the downstream end portion of the first rectifying plate 15 is formed in an arc shape has been described as an example, but the present invention is not limited thereto. That is, for example, the first current plate 15 may be formed in a shape having a hypotenuse inclined in the width direction. Specifically, as shown in FIG. 10, the downstream end of the first rectifying plate 15A is formed in a triangular shape, and the second upstream end is cut out in a triangular shape correspondingly. You may form in. Also in such a modification, the same effect as the above-described embodiment can be obtained.

また、上記一実施形態においては、第２の整流板１６の上流側端部は、第１の整流板１５の下流側端部に対応する形状に形成し、かつ第１の整流板１５の下流側端部からベンド管５の曲げ方向に離間した場合を例にとって説明したが、これに限られない。すなわち、例えば図１１に示すように、第１の整流板１５Ａの下流側端部を三角状に形成し、第２の整流板１６Ｂの上流側端部を直線状に形成し、これら第１の整流板１５Ａの下流側端部と第２の整流板１６Ｂの上流側端部とをベンド管５の曲げ方向に重なるように配設してもよい。また、図示しないが、例えば第２の整流板の上流側端部を、第１の整流板の下流側端部に対応する形状に形成しつつ、第１の整流板の下流側端部と重なるように配設してもよい。これらの変形例においても、上記一実施形態と同様の効果を得ることができる。   In the above-described embodiment, the upstream end of the second rectifying plate 16 is formed in a shape corresponding to the downstream end of the first rectifying plate 15 and is downstream of the first rectifying plate 15. Although the case where it spaced apart in the bending direction of the bend pipe | tube 5 from the side edge part was demonstrated as an example, it is not restricted to this. That is, for example, as shown in FIG. 11, the downstream end portion of the first rectifying plate 15A is formed in a triangular shape, and the upstream end portion of the second rectifying plate 16B is formed in a linear shape. The downstream end of the rectifying plate 15A and the upstream end of the second rectifying plate 16B may be disposed so as to overlap in the bending direction of the bend pipe 5. Although not shown, for example, the upstream end of the second rectifying plate is formed in a shape corresponding to the downstream end of the first rectifying plate, and overlaps with the downstream end of the first rectifying plate. You may arrange | position. Also in these modified examples, the same effect as the one embodiment can be obtained.

また、上記一実施形態においては、第１の整流板１５及び第２の整流板１６は、ベンド管５の曲げ方向に沿って湾曲するように形成した場合を例にとって説明したが、これに限られない。すなわち、例えば第２の整流板１６の下流側端部をベンド管５の内側にずらすように湾曲して設け、その曲率半径が大きくなるようにしてもよい。このような場合も、上記同様の効果を得ることができる。   In the above embodiment, the first rectifying plate 15 and the second rectifying plate 16 have been described by way of example as being bent along the bending direction of the bend pipe 5, but the present invention is not limited thereto. I can't. In other words, for example, the downstream end portion of the second rectifying plate 16 may be curved so as to be shifted to the inside of the bend pipe 5, and the radius of curvature thereof may be increased. In such a case, the same effect as described above can be obtained.

なお、以上においては、流路断面が円形状であるベンド管５を例にとって説明したが、これに限られず、例えば流路断面が矩形状であるベンド管や流路断面が円形状から矩形状に変化する扁平ベンド管などに適用してもよい。また、本発明の適用対象として軸流ポンプを例にとって説明したが、これに限られず、例えば斜流ポンプに適用してもよいことは言うまでもない。   In the above description, the bend pipe 5 having a circular channel cross section has been described as an example. However, the present invention is not limited to this. For example, a bend pipe having a rectangular channel cross section or a channel cross section having a rectangular shape from a circular shape. You may apply to the flat bend pipe etc. which change to. Moreover, although the axial flow pump has been described as an example of application of the present invention, the present invention is not limited thereto, and it goes without saying that the present invention may be applied to, for example, a mixed flow pump.

本発明の立軸ポンプの一実施形態の全体構造を表す縦断面図である。It is a longitudinal section showing the whole structure of one embodiment of the vertical shaft pump of the present invention. 図１中断面II−IIによる断面図であり、第１及び第２の整流板の構造を表す。It is sectional drawing by the cross section II-II in FIG. 1, and represents the structure of the 1st and 2nd baffle plate. 図１中断面III−IIIによる断面図であり、第１の整流板を支持する支持棒の断面形状を表す。It is sectional drawing by the cross section III-III in FIG. 1, and represents the cross-sectional shape of the support bar which supports the 1st baffle plate. 本発明の立軸ポンプの一実施形態における第１の整流板と第２の整流板との間の隙間を通過する流れを表す図である。It is a figure showing the flow which passes through the clearance gap between the 1st rectifier plate and the 2nd rectifier plate in one Embodiment of the vertical shaft pump of this invention. 図１中断面Ｖ−Ｖにおける流路断面の二次流れを表す図である。It is a figure showing the secondary flow of the flow-path cross section in the cross section VV in FIG. 比較例による第１及び第２の整流板の構造を表す図である。It is a figure showing the structure of the 1st and 2nd baffle plate by a comparative example. 比較例における第１の整流板と第２の整流板との間の隙間を通過する流れを表す図である。It is a figure showing the flow which passes through the clearance gap between the 1st rectifying plate and the 2nd rectifying plate in a comparative example. 比較例における流路断面の二次流れを表す図である。It is a figure showing the secondary flow of the flow-path cross section in a comparative example. 本発明の立軸ポンプを構成する第１及び第２の整流板の一変形例の構造を表す図である。It is a figure showing the structure of the modification of the 1st and 2nd baffle plate which comprises the vertical shaft pump of this invention. 本発明の立軸ポンプを構成する第１及び第２の整流板の他の変形例の構造を表す図である。It is a figure showing the structure of the other modification of the 1st and 2nd baffle plate which comprises the vertical shaft pump of this invention.

符号の説明Explanation of symbols

１ 立軸ポンプ
２ 羽根車
３ ケーシング
５ ベンド管
８ 回転軸
１４ 保護管
１５，１５Ａ 第１の整流板
１６，１６Ａ，１６Ｂ 第２の整流板
１８，１８Ａ，１８Ｂ 隙間 DESCRIPTION OF SYMBOLS 1 Vertical shaft pump 2 Impeller 3 Casing 5 Bend pipe 8 Rotating shaft 14 Protection pipe | tube 15, 15A 1st rectifying plate 16, 16A, 16B 2nd rectifying plates 18, 18A, 18B Crevice

Claims (3)

羽根車と、前記羽根車を内包するケーシングと、前記ケーシングの下流側に接続されたベンド管と、前記ケーシング及びベンド管内に回転可能に設けられ、下端部に前記羽根車を取付けた回転軸と、前記回転軸の周囲を覆う保護管とを備えた立軸ポンプにおいて、
前記ベンド管は、前記ベンド管の中心線より内側に設けた第１の整流板と、前記第１の整流板との間に隙間を形成するように、前記第１の整流板の下流側かつ内側にずらして設けた第２の整流板とを有し、
前記第１の整流板の下流側端部は、前記第１の整流板と前記第２の整流板との間の隙間を通過する流れに前記第１の整流板の幅方向成分を生じさせる形状としたことを特徴とする立軸ポンプ。 An impeller, a casing containing the impeller, a bend pipe connected to the downstream side of the casing, a rotating shaft provided rotatably in the casing and the bend pipe, and having the impeller attached to a lower end portion thereof In a vertical shaft pump provided with a protective tube covering the periphery of the rotating shaft,
The bend pipe is formed on the downstream side of the first rectifying plate and so as to form a gap between the first rectifying plate provided inside the center line of the bend pipe and the first rectifying plate. A second rectifying plate provided to be shifted inward,
The downstream end of the first rectifying plate has a shape that generates a width direction component of the first rectifying plate in the flow passing through the gap between the first rectifying plate and the second rectifying plate. Vertical shaft pump characterized by that. 請求項１記載の立軸ポンプにおいて、前記第１の整流板の下流側段部は、円弧状に形成したことを特徴とする立軸ポンプ。   2. The vertical shaft pump according to claim 1, wherein the downstream step portion of the first rectifying plate is formed in an arc shape. 請求項１記載の立軸ポンプにおいて、前記第１の整流板の下流側端部は、前記第１の整流板の幅方向に傾斜した斜辺を有する形状に形成したことを特徴とする立軸ポンプ。   2. The vertical shaft pump according to claim 1, wherein the downstream end portion of the first rectifying plate is formed in a shape having a hypotenuse inclined in the width direction of the first rectifying plate.
JP2006271093A 2006-10-02 2006-10-02 Vertical shaft pump Expired - Fee Related JP4770681B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013217299A (en) * 2012-04-10 2013-10-24 Ebara Corp Pump device having rectification cover, and rectification cover
KR101434504B1 (en) 2014-04-10 2014-08-26 (주)대한중전기 a vertical pump having a apparatus of shaft protecting
CN104179689A (en) * 2013-05-20 2014-12-03 株式会社日立制作所 Draw-out type vertical-shaft pump
JP2015094315A (en) * 2013-11-13 2015-05-18 株式会社日立製作所 Vertical shaft pump
CN107503977A (en) * 2017-08-17 2017-12-22 上海凯泉泵业（集团）有限公司 The withdrawable water pump of rotor that a kind of stator, runner envelope are fixed

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JPH09100812A (en) * 1995-10-03 1997-04-15 Mitsubishi Heavy Ind Ltd Deflector vane
JPH11287200A (en) * 1998-04-01 1999-10-19 Nikkiso Co Ltd Liquid flow swinging device
JP2004027999A (en) * 2002-06-27 2004-01-29 Hitachi Industries Co Ltd Vertical shaft pump

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Publication number Priority date Publication date Assignee Title
JPH09100812A (en) * 1995-10-03 1997-04-15 Mitsubishi Heavy Ind Ltd Deflector vane
JPH11287200A (en) * 1998-04-01 1999-10-19 Nikkiso Co Ltd Liquid flow swinging device
JP2004027999A (en) * 2002-06-27 2004-01-29 Hitachi Industries Co Ltd Vertical shaft pump

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013217299A (en) * 2012-04-10 2013-10-24 Ebara Corp Pump device having rectification cover, and rectification cover
CN104179689A (en) * 2013-05-20 2014-12-03 株式会社日立制作所 Draw-out type vertical-shaft pump
JP2015094315A (en) * 2013-11-13 2015-05-18 株式会社日立製作所 Vertical shaft pump
CN104632704A (en) * 2013-11-13 2015-05-20 株式会社日立制作所 Vertical shaft pump
CN104632704B (en) * 2013-11-13 2017-04-12 株式会社日立制作所 Vertical shaft pump
KR101434504B1 (en) 2014-04-10 2014-08-26 (주)대한중전기 a vertical pump having a apparatus of shaft protecting
CN107503977A (en) * 2017-08-17 2017-12-22 上海凯泉泵业（集团）有限公司 The withdrawable water pump of rotor that a kind of stator, runner envelope are fixed

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