【０００１】
【発明の属する技術分野】
この発明は、雨水または汚水等の排水に用いる立軸斜流ポンプあるいは立軸軸流ポンプに関する。
【０００２】
【従来の技術】
従来、雨水または汚水等に用いられる立軸斜流ポンプあるいは立軸軸流ポンプは、長い駆動軸の中位部を揚水管に配設した中間軸受で軸支して、駆動軸の偏芯回転や振動を防止する装置は、例えば、特開平１１−３７０８２号の図８に図示してあるように公知である。
【０００３】
【発明が解決しょうとする課題】
下水道等の汚水中には様々な物体が含まれており、流れてきた紐状物などが立軸ポンプの前段に設置したスクリーンを潜り抜け、ポンプに吸込まれる。ポンプの羽根車や案内羽根は、水流の流れ方向の羽根幅が広く絡み付くことが少なく揚水管に流出する。羽根車や案内羽根に絡み付いた紐状物は、羽根車の回転と加速された旋回流で絡み付きが外れる。図５および図６は中間軸受の支持リブに紐状物が絡み付く概念図であって、ポンプに吸込まれた紐状物Ｂは、羽根車と案内羽根を通過して、流れ方向の幅が短い中間軸受の支持リブに、多くの絡み付きが発生する。紐状物は旋回流による外乱も無いことから、一度絡み付くと揚水流では外れず、後から流れてくる紐状物がさらに絡み付き成長する。揚水管に絡み付いた物体により揚水流路が狭くなり、ついには閉塞して揚水が不能となる。現状では、揚水管の閉塞の都度運転を停止して分解し、絡み付いた物体を除去する必要がある。この発明は、紐状物の絡み付きの無い立軸ポンプの中間軸受を提供することを目的とする。
【０００４】
【課題を解決するための手段】
この発明の要旨は、下端に羽根車を止着した駆動軸を揚水管に垂設し、揚水管に配設した中間軸受で駆動軸を回転自在に軸支させると共に、吸込ベルの吸込口から吸入した水を羽根車で加圧して、吐出ボウルの案内羽根で整流化させた流水を揚水管に揚水する立軸ポンプにおいて、駆動軸を軸支する中間軸受の支持リブと吐出ボウルに配設した案内羽根を揚水方向に垂設した仕切板で連結して、揚水管に案内羽根から中間軸受まで連続する複数の揚水流路を形成し、紐状物の絡みつきを防止するものである。揚水管を分割する揚水流路は、案内羽根の枚数を中間軸受の支持リブの本数より多く配設して、支持リブと任意の案内羽根を仕切板に連結してもよいものである。
【０００５】
【発明の実施の形態】
ポンプに吸込まれた紐状物は羽根車と案内羽根を通過して、案内羽根から中間軸受まで連続して形成された複数の揚水流路を上昇する。揚水管に揚水上の障害物が排除され、紐状物が中間軸受の支持リブに絡みつくことがなく、揚水管を閉塞されることがない。また、羽根車の加圧旋回流を案内羽根で直線流に変換し、仕切板で更に整流化させるので、整流化の相乗効果を奏する。そして、仕切板の上端部を駆動軸の中間軸受に連結してあるので、中間軸受が揚水の水流抵抗となることがなく、駆動軸の外周面に設けた保護管の剛性も高めることができる。
【０００６】
【実施例】
この発明の実施例を図面に基づき詳述すると、まず、図１は立軸斜流ポンプであって、吸込ベル１に配設した羽根車２が垂下した駆動軸３の下端に止着してあり、羽根車２の上方近傍に複数枚の案内羽根４…が配設してある。この案内羽根４は吐出ボウル５の内周面と駆動軸３の下部を軸支した軸受ケース６の外周面に連結してある。揚水管７の上部に配設した中間軸受８に駆動軸３が軸支してあり、中間軸受８は複数本の垂設した平板状の支持リブ９…に連結され、この支持リブ９…を揚水管７の内周面に止着してある。駆動軸３の外周には保護管１０が配設してあり、保護管の上下端が中間軸受８の下端と案内羽根４の軸受ケース６の上端にそれぞれ止着してある。揚水管７の上部に吐出エルボ１１が連結してあり、吐出エルボ１１の上部周壁に配設した軸受箱１２に、駆動機（図示せず）に連動連結した上部駆動軸１３を軸支してある。吐出エルボ１１の内部に垂下させた上部駆動軸１３の下端が軸継手１４を介して駆動軸３の上端に連結してあり、駆動機の動力を羽根車２に伝達させる。吸込ベル１の吸込口１ａから吸込んだ水を羽根車２で加圧して、加圧旋回流を案内羽根４で直線流に整流化させ、揚水管７を揚水させて吐出エルボ１１から排水させる。
【０００７】
図２は立軸斜流ポンプに内設した案内羽根と中間軸受の斜視図であって、揚水管７の上部に止着した中間軸受８の支持リブ９と吐出ボウル５に配設した案内羽根４を複数枚の垂設した仕切板１５で連結してある。この仕切板１５の両側面が揚水管７の内周面と保護管１０の外周面に止着して、複数の揚水流路Ａ…が形成してある。紐状物Ｂがポンプに流入しても、案内羽根４から中間軸受８まで連続した複数の揚水流路Ａ…が形成されるので、揚水上の障害物が排除され、紐状物Ｂがポンプの内部に絡まることがない。また、揚水管７に止着した仕切板１５で保護管１０が補強され、保護管１０の振動も補強効果により防止される。羽根車２の加圧旋回流を案内羽根で直線流に変換し、仕切板で更に整流化させるので、整流化の相乗効果が得られる。
【０００８】
図３（ａ）、（ｂ）は吐出ボウルと揚水管の横断概念図であって、この実施例では、駆動軸３を軸支する中間軸受８は、図２に示す３本の支持リブ９…が揚水管７に等間隔（１２０°）に連結してあり、この３本の支持リブ９の下端に仕切板１５が止着してある。６枚の案内羽根４が吐出ボウル５を等間隔（６０°）に分割して止着してあり、１枚おきの案内羽根４と仕切板１５の下端が連結してあり、吐出ボウル５と揚水管７を均等（１２０°）に３分割する揚水流路Ａ…を形成してある。
【０００９】
図４（ａ）、（ｂ）は、吐出ボウルと揚水管の、他の実施例の横断概念図であって、この実施例では、図２および図３（ｂ）と同様の中間軸受８に設けた３本の支持リブ９が揚水管７を等間隔（１２０°）に分割してある。吐出ボウル５には７枚の案内羽根４…が吐出ボウル５を分割（略５１．４°）して配設してあり、上端を支持リブ９に連結した３枚の仕切板１５…の下端が、吐出ボウル５を不均等に分割する１枚おき（略１０２．８°）と２枚おき（略１５４．２°）の案内羽根４に連結して、揚水管７を３分割する不均等な揚水流路Ａ…を形成してある。なお、案内羽根４の枚数は３〜９枚、中間軸８の支持ボス９は３〜５個としても、揚水流路Ａは形成されるもので、中間軸受８の支持ボス９の位置を案内羽根４の枚数に合せて振り分けてもよいものである。なお、狭い複数の揚水流路Ａを流れることで、揚水管７の管摩擦損失は多少増加するものであるが、揚水管７を幾分太くし、流速を低くすることで摩擦損失増加を抑制することも可能である。
【００１０】
【発明の効果】
この発明は上記のように構成してあり、立軸ポンプの揚水管に密閉した複数の揚水流路を形成したので、紐状物の絡みつきが防止されるものである。即ち、従来の立軸ポンプにあっては、ポンプに吸込まれた紐状物が駆動軸を軸支する中間軸受に絡み付き、揚水管を閉塞させる恐れがあった。また、中間軸受が水流抵抗となるものであるが、この発明にあっては、駆動軸を軸支する中間軸受の支持リブと吐出ボウルに配設した案内羽根を揚水方向に垂設した仕切板で連結して、揚水管に案内羽根から中間軸受まで連続する複数の揚水流路Ａ…を形成したので、紐状物がポンプの内部に絡まることがなく、中間軸受が水流抵抗となることもない。また、羽根車２の加圧旋回流を案内羽根４と揚水流路Ａで整流化させるので相乗効果も得られる。そして、保護管が揚水管に止着した仕切板で補強され、補強効果により保護管の振動が防止される。したがって、揚水上の障害物が排除され、安定したポンプ運転が可能となり、揚水効果も向上する。
【図面の簡単な説明】
【図１】この発明に係る立軸斜流ポンプの縦断面図である。
【図２】この発明に係る立軸斜流ポンプに内設した案内羽根から中間軸受に形成した揚水流路の斜視図である。
【図３】同じく、立軸ポンプの横断概念図であって、（ａ）は案内羽根の配設状態を示す吐出ボウル、（ｂ）は仕切板の配設状態を示す揚水管である。
【図４】同じく、他の実施例、立軸ポンプの横断概念図であって、（ａ）は案内羽根の配設状態を示す吐出ボウル、（ｂ）は仕切板の配設状態を示す揚水管である。
【図５】従来の、流入してくる紐状物が中間軸受の支持リブにひっかかる状態を示す概念図である。
【図６】同じく、中間軸受の支持リブに紐状物が絡み付く状態を示す概念図であって
【符号の説明】
１ 吸込ベル
１ａ 吸込口
２ 羽根車
３ 駆動軸
４ 案内羽根
５ 吐出ボウル
７ 揚水管
８ 中間軸受
９ 支持リブ
１５ 仕切板
Ａ 揚水流路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vertical-shaft diagonal flow pump or a vertical-shaft axial flow pump used for drainage of rainwater or sewage.
[0002]
[Prior art]
Conventionally, a vertical shaft diagonal flow pump or a vertical shaft axial flow pump used for rainwater or sewage is supported by an intermediate bearing with a middle portion of a long drive shaft arranged in a pumping pipe, and eccentric rotation or vibration of the drive shaft. An apparatus for preventing this is known, for example, as shown in FIG. 8 of JP-A-11-37082.
[0003]
[Problems to be solved by the invention]
Various objects are contained in sewage such as sewers, and the string that has flowed through the screen installed in the front stage of the vertical shaft pump is sucked into the pump. The impeller and the guide vane of the pump have a wide blade width in the flow direction of the water flow and are not easily entangled and flow out to the pumping pipe. The string-like object entangled with the impeller and the guide vane is disentangled by the rotation of the impeller and the accelerated swirl flow. FIGS. 5 and 6 are conceptual diagrams in which a string-like object is entangled with a support rib of an intermediate bearing, and the string-like object B sucked into the pump passes through the impeller and the guide vane and has a short width in the flow direction. Many entanglements occur in the support ribs of the intermediate bearing. Since the string-like object is not disturbed by the swirling flow, once it gets entangled, it does not come off in the pumped flow, and the string-like substance that flows later grows further entangled. The pumping channel is narrowed by the object entangled with the pumping pipe, and finally, the pumping channel is closed and pumping becomes impossible. At present, it is necessary to stop the operation and disassemble each time the pumping pipe is blocked, and remove the entangled objects. It is an object of the present invention to provide an intermediate bearing for a vertical shaft pump that does not involve string-like objects.
[0004]
[Means for Solving the Problems]
The gist of the present invention is that a drive shaft with an impeller fixed to the lower end is suspended from a pumping pipe, and the drive shaft is rotatably supported by an intermediate bearing disposed on the pumping pipe, and from the suction port of the suction bell. In a vertical shaft pump that pressurizes sucked water with an impeller and pumps running water rectified by guide vanes of the discharge bowl into a pumping pipe, it is arranged on the support rib of the intermediate bearing that supports the drive shaft and the discharge bowl. The guide blades are connected by a partition plate suspended in the pumping direction to form a plurality of pumping channels that are continuous from the guide blades to the intermediate bearings in the pumping pipe to prevent the string-like objects from getting tangled. The pumping flow path that divides the pumping pipe may be configured such that the number of guide blades is greater than the number of support ribs of the intermediate bearing, and the support ribs and arbitrary guide blades are connected to the partition plate.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The string-like object sucked into the pump passes through the impeller and the guide vane, and ascends a plurality of pumping channels formed continuously from the guide vane to the intermediate bearing. Obstacles on pumping are eliminated from the pumping pipe, the string-like object is not entangled with the support ribs of the intermediate bearing, and the pumping pipe is not blocked. Further, since the pressurized swirling flow of the impeller is converted into a linear flow by the guide vanes and further rectified by the partition plate, there is a synergistic effect of rectification. And since the upper end part of the partition plate is connected to the intermediate bearing of the drive shaft, the intermediate bearing does not become the water flow resistance of the pumping water, and the rigidity of the protective tube provided on the outer peripheral surface of the drive shaft can be increased. .
[0006]
【Example】
An embodiment of the present invention will be described in detail with reference to the drawings. First, FIG. 1 shows a vertical shaft diagonal flow pump, which is fixed to a lower end of a drive shaft 3 on which an impeller 2 disposed on a suction bell 1 is suspended. A plurality of guide blades 4 are arranged in the vicinity of the upper portion of the impeller 2. The guide blade 4 is connected to the outer peripheral surface of a bearing case 6 that pivotally supports the inner peripheral surface of the discharge bowl 5 and the lower portion of the drive shaft 3. The drive shaft 3 is pivotally supported on an intermediate bearing 8 disposed on the upper portion of the pumping pipe 7, and the intermediate bearing 8 is connected to a plurality of flat plate-like support ribs 9. It is fixed to the inner peripheral surface of the pumping pipe 7. A protective tube 10 is disposed on the outer periphery of the drive shaft 3, and upper and lower ends of the protective tube are fixed to a lower end of the intermediate bearing 8 and an upper end of the bearing case 6 of the guide vane 4, respectively. A discharge elbow 11 is connected to the upper portion of the pumping pipe 7, and an upper drive shaft 13 linked to a drive machine (not shown) is supported on a bearing box 12 disposed on the upper peripheral wall of the discharge elbow 11. is there. The lower end of the upper drive shaft 13 suspended from the inside of the discharge elbow 11 is connected to the upper end of the drive shaft 3 via the shaft coupling 14, and transmits the power of the drive machine to the impeller 2. The water sucked from the suction port 1 a of the suction bell 1 is pressurized by the impeller 2, the pressurized swirling flow is rectified into a linear flow by the guide blade 4, the pumping pipe 7 is pumped and drained from the discharge elbow 11.
[0007]
FIG. 2 is a perspective view of the guide vanes and intermediate bearings provided in the vertical shaft mixed flow pump. The guide ribs 4 are disposed on the support ribs 9 of the intermediate bearing 8 fixed to the upper part of the pumping pipe 7 and the discharge bowl 5. Are connected by a plurality of vertically extending partition plates 15. Both side surfaces of the partition plate 15 are fixed to the inner peripheral surface of the pumping pipe 7 and the outer peripheral surface of the protective pipe 10 to form a plurality of pumping flow paths A. Even if the string-like object B flows into the pump, a plurality of pumping channels A ... that are continuous from the guide blade 4 to the intermediate bearing 8 are formed, so that obstacles on the pumping are eliminated, and the string-like object B is used as the pump. There is no tangling inside. Further, the protective tube 10 is reinforced by the partition plate 15 fixed to the pumping tube 7, and the vibration of the protective tube 10 is also prevented by the reinforcing effect. Since the pressurized swirling flow of the impeller 2 is converted into a linear flow by the guide vanes and further rectified by the partition plate, a synergistic effect of rectification is obtained.
[0008]
3 (a) and 3 (b) are cross-sectional conceptual views of the discharge bowl and the pumping pipe. In this embodiment, the intermediate bearing 8 that supports the drive shaft 3 has three support ribs 9 shown in FIG. Are connected to the pumping pipe 7 at equal intervals (120 °), and a partition plate 15 is fixed to the lower ends of the three support ribs 9. Six guide vanes 4 divide and fix the discharge bowl 5 at equal intervals (60 °), and every other guide vane 4 and the lower end of the partition plate 15 are connected. Pumping flow paths A are formed to divide the pumping pipe 7 into three equal parts (120 °).
[0009]
4 (a) and 4 (b) are cross-sectional conceptual views of another embodiment of the discharge bowl and the pumping pipe. In this embodiment, the intermediate bearing 8 similar to that in FIGS. 2 and 3 (b) is used. Three provided support ribs 9 divide the pumping pipe 7 at equal intervals (120 °). The discharge bowl 5 has seven guide blades 4... Which are divided (approximately 51.4 °) from the discharge bowl 5, and the lower ends of the three partition plates 15 having upper ends connected to the support ribs 9. However, it is connected to the guide vanes 4 every other (approximately 102.8 °) and every other (approximately 154.2 °) that divide the discharge bowl 5 unevenly, and the pumping pipe 7 is divided into three. A pumping channel A is formed. Even if the number of guide blades 4 is 3 to 9, and the number of support bosses 9 of the intermediate shaft 8 is 3 to 5, the pumping passage A is formed, and the position of the support boss 9 of the intermediate bearing 8 is guided. It may be distributed according to the number of blades 4. In addition, although the pipe friction loss of the pumping pipe 7 increases a little by flowing through a plurality of narrow pumping channels A, the increase in the friction loss is suppressed by making the pumping pipe 7 somewhat thicker and lowering the flow velocity. It is also possible to do.
[0010]
【The invention's effect】
Since this invention is comprised as mentioned above and formed the several pumping flow path sealed in the pumping pipe of a vertical shaft pump, the tangle of a string-like thing is prevented. That is, in the conventional vertical shaft pump, the string-like object sucked into the pump may be entangled with the intermediate bearing that supports the drive shaft, thereby closing the pumping pipe. In the present invention, the intermediate bearing has water flow resistance. In the present invention, the support plate of the intermediate bearing that supports the drive shaft and the guide plate disposed in the discharge bowl are suspended in the pumping direction. Since the plurality of pumping passages A that are continuous from the guide vanes to the intermediate bearing are formed in the pumping pipe, the string-like object does not get entangled in the pump, and the intermediate bearing may have water flow resistance. Absent. Further, since the swirling flow of the impeller 2 is rectified by the guide vanes 4 and the pumping channel A, a synergistic effect is also obtained. And a protection pipe is reinforced with the partition plate fixed to the pumping pipe, and the vibration of a protection pipe is prevented by the reinforcement effect. Accordingly, obstacles on pumping are eliminated, stable pump operation is possible, and the pumping effect is improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a vertical shaft mixed flow pump according to the present invention.
FIG. 2 is a perspective view of a pumping flow path formed in an intermediate bearing from guide vanes provided in the vertical shaft diagonal flow pump according to the present invention.
FIG. 3 is a conceptual cross-sectional view of a vertical shaft pump, in which FIG.
4A and 4B are cross-sectional conceptual views of another embodiment, a vertical shaft pump, in which FIG. 4A is a discharge bowl showing an arrangement state of guide vanes, and FIG. It is.
FIG. 5 is a conceptual diagram showing a state in which an incoming string-like object is caught on a support rib of an intermediate bearing.
FIG. 6 is also a conceptual diagram showing a state in which a string-like object is entangled with a support rib of an intermediate bearing.
DESCRIPTION OF SYMBOLS 1 Suction bell 1a Suction port 2 Impeller 3 Drive shaft 4 Guide blade 5 Discharge bowl 7 Pumping pipe 8 Intermediate bearing 9 Support rib 15 Partition plate A Pumping flow path
