JP7186119B2 - Operation method of suction cover, horizontal shaft pump, pump gate and pump gate - Google Patents

Operation method of suction cover, horizontal shaft pump, pump gate and pump gate Download PDF

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JP7186119B2
JP7186119B2 JP2019059546A JP2019059546A JP7186119B2 JP 7186119 B2 JP7186119 B2 JP 7186119B2 JP 2019059546 A JP2019059546 A JP 2019059546A JP 2019059546 A JP2019059546 A JP 2019059546A JP 7186119 B2 JP7186119 B2 JP 7186119B2
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pump
cover
suction port
water
horizontal shaft
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JP2020159285A (en
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靖志 橋本
健司 浦野
真 野口
潤弥 佐藤
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Kubota Corp
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Kubota Corp
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Priority to CN202010076004.3A priority patent/CN111749930B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/528—Casings; Connections of working fluid for axial pumps especially adapted for liquid pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
    • E02B7/20—Movable barrages; Lock or dry-dock gates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2210/00—Working fluids
    • F05D2210/10—Kind or type
    • F05D2210/11—Kind or type liquid, i.e. incompressible

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

本発明は、横軸ポンプの吸込口に取付けられる吸込カバー、吸込カバーを備えた横軸ポンプ、横軸ポンプを有するポンプゲート、およびポンプゲートの運転方法に関する。 TECHNICAL FIELD The present invention relates to a suction cover attached to a suction port of a horizontal shaft pump, a horizontal shaft pump provided with the suction cover, a pump gate having the horizontal shaft pump, and a pump gate operating method.

従来、この種の吸込カバーとしては、例えば図２９，図３０に示すように、流水路に設置された開閉自在なゲート１０２に設けられた横軸ポンプ１０３（或いは流水路を区画する壁体に貫通して設けられた横軸ポンプ、又は水槽内に設置されて揚水管と吐出管とが接続された横軸ポンプ）のポンプ吸込口１０４に取付けられる吸込カバー１０５がある。吸込カバー１０５は、ポンプ吸込口１０４の前方を下部が開口された状態で覆うカバー本体１０６を有している。 Conventionally, as this type of suction cover, for example, as shown in FIGS. There is a suction cover 105 attached to a pump suction port 104 of a horizontal shaft pump provided through the water tank, or a horizontal shaft pump installed in a water tank and having a pumping pipe and a discharge pipe connected to each other. The suction cover 105 has a cover main body 106 that covers the front of the pump suction port 104 with its lower portion opened.

カバー本体１０６は、ポンプ吸込口１０４に取付可能であり、下向きに開口したカバー吸込口１１１を有している。また、横軸ポンプ１０３は羽根車１１２を回転させるモータ１１３を備えている。 The cover main body 106 can be attached to the pump suction port 104 and has a cover suction port 111 that opens downward. The horizontal shaft pump 103 also has a motor 113 that rotates an impeller 112 .

これによると、図２９に示すように、ゲート１０２を下降して流水路を閉じた状態で、ゲート１０２の下流側１１８の水位が上流側１１９の水位ＷＬ１よりも高く、横軸ポンプ１０３が上流側１１９の水面１１７下に没している場合、横軸ポンプ１０３を定格回転速度で作動させ、上流側１１９から流れ込んでくる水を強制的に下流側１１８に排出する。この際、横軸ポンプ１０３は、カバー吸込口１１１から吸い込まれる水に空気が混入しない全量排水運転で運転されている。 According to this, as shown in FIG. 29, the water level on the downstream side 118 of the gate 102 is higher than the water level WL1 on the upstream side 119 when the gate 102 is lowered to close the water channel, and the horizontal shaft pump 103 is moved upstream. When the side 119 is submerged under the water surface 117 , the horizontal shaft pump 103 is operated at the rated rotational speed to force the water flowing from the upstream side 119 to the downstream side 118 . At this time, the horizontal shaft pump 103 is operated in a full discharge operation in which air is not mixed with the water sucked from the cover suction port 111 .

その後、図３０に示すように、上流側の水位ＷＬ１が低下してカバー吸込口１１１の上端位置Ａに達すると、横軸ポンプ１０３を定格回転速度で作動させたままで、カバー吸込口１１１から吸い込まれる水に空気１１５が混入し、気水混合流体となって横軸ポンプ１０３からゲートの下流側へ排出される。この際、横軸ポンプ１０３は、カバー吸込口１１１から吸い込まれる水に空気１１５が混入する気水混合排水運転で運転されている。 After that, as shown in FIG. 30, when the upstream water level WL1 drops and reaches the upper end position A of the cover suction port 111, the horizontal shaft pump 103 is kept operating at the rated rotation speed, and the water is drawn from the cover suction port 111. Air 115 is mixed with the water to be discharged, and the air-water mixed fluid is discharged from the horizontal shaft pump 103 to the downstream side of the gate. At this time, the horizontal shaft pump 103 is operated in the air-water mixed drainage operation in which air 115 is mixed with the water sucked from the cover suction port 111 .

その後、カバー本体１０６内の水位が低下してポンプ吸込口１０４の中心Ｂ以下になり、更にカバー本体１０６内の水位が低下して羽根車１１２と水面との接触が僅かになると、横軸ポンプ１０３を、定格回転速度で作動させたまま、ゲート１０２の下流側への排水が行われない排水待機運転で運転する。 After that, when the water level in the cover main body 106 drops below the center B of the pump suction port 104, and the water level in the cover main body 106 further drops and the contact between the impeller 112 and the water surface becomes slight, the horizontal shaft pump 103 is operated at the rated rotational speed, and is operated in a water discharge standby operation in which water is not discharged to the downstream side of the gate 102.例文帳に追加

上記のように横軸ポンプ１０３を定格回転速度で作動させた状態で、図２９に示したような全量排水運転から図３０に示したような気水混合排水運転を経て排水待機運転へ切り換えられた場合、図３１のグラフＧ５に示した吸込水位の変化に対して、グラフＧ６に示すように、全量排水運転時および排水待機運転時における横軸ポンプ１０３のモータ１１３の消費電力の変動量は小さいが、気水混合排水運転時におけるモータ１１３の消費電力の変動量Ｄは全量排水運転時および排水待機運転時における変動量に比べて大きくなっている。 In the state where the horizontal shaft pump 103 is operated at the rated rotation speed as described above, the full discharge operation as shown in FIG. In this case, with respect to the change in the suction water level shown in the graph G5 of FIG. Although small, the fluctuation amount D of the power consumption of the motor 113 during the air-water mixed drainage operation is larger than the fluctuation amount during the full discharge operation and during the drainage standby operation.

尚、このような消費電力の変動量Ｄの要因については以下のように考えられる。すなわち、図３０に示すように、気水混合排水運転時において、カバー吸込口１１１から水と共に吸込カバー１０５内に断続的に吸い込まれた空気１１５は、羽根車１１２に到達するまでに浮上し、次第にカバー本体１０６内の上部に集中して空気溜まり１１６が発生し、この空気溜まり１１６がある程度大きくなった時点で、空気溜まり１１６の空気１１５が大きな気泡となって一気に羽根車１１２に流入して羽根車１１２によって細かく粉砕されるといった現象が、断続的に繰り返される。このため、羽根車１１２にかかる負荷の変動量が大きくなり、これに伴って気水混合排水運転時におけるモータ１１３の消費電力の変動量Ｄが増大すると考えられる。 It should be noted that the factors of such fluctuation amount D of power consumption are considered as follows. That is, as shown in FIG. 30, during air-water mixed drainage operation, air 115 intermittently sucked into the suction cover 105 together with water from the cover suction port 111 floats up before reaching the impeller 112. An air pool 116 is gradually formed in the upper part of the cover body 106 , and when the air pool 116 becomes large enough, the air 115 in the air pool 116 becomes large bubbles and flows into the impeller 112 at once. The phenomenon of being finely pulverized by the impeller 112 is intermittently repeated. For this reason, the amount of fluctuation in the load applied to the impeller 112 increases, and accordingly, the amount of fluctuation D in the power consumption of the motor 113 during the air-water mixed drainage operation is considered to increase.

このように、気水混合排水運転時におけるモータ１１３の消費電力の変動量Ｄが大きいと、モータ１１３にかかる負荷が増大するといった問題がある。 As described above, if the fluctuation amount D of the power consumption of the motor 113 during the air-water mixed drainage operation is large, there is a problem that the load applied to the motor 113 increases.

上記のような気水混合排水運転時におけるモータ１１３の消費電力の変動量Ｄを抑制するために、例えば図３２に示すように、カバー本体１０６の上部壁１１０の先端縁から下向きに前部壁１２０を設け、前部壁１２０に鋸状の切欠部１２１を形成した吸込カバー１２２がある。 In order to suppress the fluctuation amount D of the power consumption of the motor 113 during the air-water mixed drainage operation as described above, for example, as shown in FIG. There is a suction cover 122 provided with 120 and having a serrated notch 121 formed in the front wall 120 .

これによると、上流側の水位ＷＬ１が低下してカバー吸込口１１１の上端位置Ａに達すると、カバー吸込口１１１から吸い込まれる水に空気が混入し、気水混合流体となって横軸ポンプ１０３からゲート１０２の下流側へ排出される。 According to this, when the water level WL1 on the upstream side drops and reaches the upper end position A of the cover suction port 111, the water sucked from the cover suction port 111 is mixed with air, and becomes an air-water mixed fluid, and the horizontal shaft pump 103 from the gate 102 to the downstream side.

図３２に示すような吸込カバー１２２を用いることにより、気水混合排水運転時におけるモータ１１３の消費電力の変動量Ｄが抑制される。この要因としては、気水混合排水運転の際、空気はカバー吸込口１１１と切欠部１２１とを通ってカバー本体１０６内に吸い込まれるため、空気の吸込量が比較的安定し、カバー本体１０６内の上部に発生する空気溜まり１１６が大きく成長する前に、空気が、大きな気泡にならずに、分散した状態でカバー本体１０６内の上部から羽根車１１２に流入するためであると考えられる。 By using the suction cover 122 as shown in FIG. 32, the fluctuation amount D of the power consumption of the motor 113 during the air-water mixed drainage operation is suppressed. The reason for this is that air is sucked into the cover main body 106 through the cover inlet 111 and the notch 121 during the air-water mixed drainage operation, so that the amount of air sucked is relatively stable and the inside of the cover main body 106 is It is thought that this is because the air flows into the impeller 112 from the upper part of the cover body 106 in a dispersed state without becoming large bubbles before the air pool 116 generated in the upper part of the cover body 106 grows large.

尚、上記のような吸込カバー１２２は例えば下記特許文献１に記載されている。 Incidentally, the suction cover 122 as described above is described, for example, in Patent Document 1 below.

ＷＯ２０１６／１７８３８７WO2016/178387

しかしながら図３２に示したような吸込カバー１２２では、気水混合排水運転時におけるモータ１１３の消費電力の変動量Ｄをある程度抑制することが可能であるが、このような吸込カバー１２２を用いても、気水混合排水運転における消費電力の変動量Ｄをさらに低減することは難しかった。 However, with the suction cover 122 as shown in FIG. 32, it is possible to suppress the amount of fluctuation D of the power consumption of the motor 113 during the air-water mixed drainage operation to some extent. , it was difficult to further reduce the fluctuation amount D of the power consumption in the air-water mixed drainage operation.

本発明は、気水混合排水運転時におけるモータの消費電力の変動量を低減することが可能な吸込カバー、横軸ポンプ、ポンプゲートおよびポンプゲートの運転方法を提供することを目的とする。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a suction cover, a horizontal pump, a pump gate, and a method of operating the pump gate that can reduce fluctuations in motor power consumption during air-water mixed drainage operation.

上記目的を達成するために、本第１発明は、流水路内又は水槽内に配置される横軸ポンプのポンプ吸込口のカバーであって、
ポンプ吸込口の前方を下部が開口された状態で覆うカバー本体を有し、
カバー本体は、ポンプ吸込口に取付可能であり且つポンプ吸込口からポンプ軸心に交差する方向で外側方へ張り出す後部壁と、後部壁の両側縁からポンプ軸心方向の上流側へ延びる一対の側部壁と、後部壁の上縁からポンプ軸心方向の上流側へ下り勾配で延びて、両方の側部壁の上縁間に設けられた上部壁とを有し、
両方の側部壁の下縁間で且つ後部壁の下縁と上部壁の先端縁との間に、下向きに開口したカバー吸込口が形成され、
後部壁に、カバー本体の内外に貫通する貫通部が形成され、
カバー本体をポンプ吸込口に取付けた状態で、貫通部の少なくとも上部がカバー吸込口の上端位置よりも上方に位置するものである。 In order to achieve the above object, the first invention is a cover for a pump suction port of a horizontal shaft pump arranged in a running water channel or a water tank, comprising:
Having a cover body covering the front of the pump suction port with the lower part opened,
The cover body includes a rear wall that can be attached to the pump suction port and projects outward from the pump suction port in a direction that intersects the pump axis, and a pair of covers that extend upstream in the pump axis direction from both side edges of the rear wall. and an upper wall extending downwardly from the upper edge of the rear wall to the upstream side in the axial direction of the pump and provided between the upper edges of both side walls,
a downwardly opening cover inlet is formed between the lower edges of both side walls and between the lower edge of the rear wall and the leading edge of the upper wall;
The rear wall is formed with a penetrating portion that penetrates the inside and outside of the cover body,
At least the upper portion of the through portion is located above the upper end position of the cover suction port when the cover body is attached to the pump suction port.

これによると、扉体を下降して流水路を閉じ、横軸ポンプが扉体の上流側の水面下に没している状態で、横軸ポンプを一定の回転速度（例えば定格回転速度）で作動させて全量排水運転を行っている際、扉体の上流側の水が、吸込カバーのカバー吸込口から横軸ポンプ内に吸い込まれ、横軸ポンプ内から扉体の下流側へ排出される。 According to this, the gate body is lowered to close the water channel, and the horizontal shaft pump is submerged under the water surface on the upstream side of the gate body, and the horizontal shaft pump is rotated at a constant rotation speed (for example, the rated rotation speed). During full water discharge operation, the water on the upstream side of the gate body is sucked into the horizontal shaft pump through the cover suction port of the suction cover, and discharged from the horizontal shaft pump to the downstream side of the gate body. .

その後、扉体の上流側の水位が下降してカバー吸込口の上端に到達するより前に貫通部の上部に到達した際、扉体の上流側の水面上とカバー本体内とが貫通部を介して連通し、扉体の上流側の水面上の空気が、貫通部を通ってカバー本体内に吸い込まれ、カバー吸込口からカバー本体内に吸い込まれた水と混合され、気水混合流体となる。 After that, when the water level on the upstream side of the gate body descends and reaches the upper part of the penetration before reaching the upper end of the cover suction port, the water surface on the upstream side of the door body and the inside of the cover body cross the penetration part. The air above the water surface on the upstream side of the door body is sucked into the cover body through the penetration part and mixed with the water sucked into the cover body through the cover suction port to form an air-water mixed fluid. Become.

この気水混合流体は、カバー本体内からポンプ吸込口を通って横軸ポンプ内を流れ、扉体の下流側へ排出される。このような気水混合排水運転時において、モータの消費電力の変動量が低減される。この理由は以下のように考えられる。 This air-water mixed fluid flows from inside the cover main body through the pump suction port, inside the horizontal shaft pump, and is discharged to the downstream side of the door body. During such air-water mixed drainage operation, the amount of fluctuation in power consumption of the motor is reduced. The reason for this is considered as follows.

上記のような気水混合排水運転時においては、貫通部がカバー本体の後部壁に形成されているため、貫通部はポンプ吸込口の直近に位置することになる。これにより、貫通部からカバー本体内に流入した空気は、浮上してカバー本体内の上部に集中する以前に、小さな気泡のまま分散した状態で横軸ポンプの羽根車に流入し、羽根車によって粉砕される。 During the air-water mixed drainage operation as described above, since the through portion is formed in the rear wall of the cover body, the through portion is located in the immediate vicinity of the pump suction port. As a result, the air that has flowed into the cover main body from the through portion flows into the impeller of the horizontal shaft pump in a dispersed state as small bubbles before floating and concentrating in the upper part of the cover main body. pulverized.

さらに、貫通部からカバー本体内に吸い込まれる水の流れ方向は吸込カバーのカバー吸込口からカバー本体内に吸い込まれる水の流れ方向とは逆方向になるため、貫通部からカバー本体内に吸い込まれる水の流速は小さく、渦による空気の吸い込みも軽減される。 Furthermore, since the flow direction of water sucked into the cover main body through the penetration portion is opposite to the flow direction of water sucked into the cover main body through the cover suction port of the suction cover, the water is sucked into the cover main body through the penetration portion. Water flow velocity is small, and air intake by vortices is reduced.

これにより、空気が貫通部を通じて安定してカバー本体内に流入するので、カバー本体内の上部に空気溜まりが発生するのを抑制することができ、空気溜まりの空気が大きな気泡となって一気に羽根車に流入するのを防止することができる。このため、羽根車にかかる負荷の変動量が小さくなり、これに伴って、気水混合排水運転時におけるモータの消費電力の変動量が低減され、モータにかかる負荷が軽減される。 As a result, air stably flows into the cover main body through the through-hole, so that it is possible to suppress the formation of air pools in the upper part of the cover main body, and the air in the air pools becomes large bubbles at once. You can prevent it from entering your car. Therefore, the amount of fluctuation in the load applied to the impeller is reduced, and accordingly, the amount of fluctuation in power consumption of the motor during the air-water mixed drainage operation is reduced, and the load applied to the motor is reduced.

本第２発明における吸込カバーは、貫通部は、貫通孔、又は、後部壁の下縁から上方に延びる切欠部であるものである。 In the suction cover of the second aspect of the present invention, the through portion is a through hole or a notch extending upward from the lower edge of the rear wall.

これによると、扉体の上流側の水位が下降してカバー吸込口の上端に到達するより前に貫通孔又は切欠部の上部に到達した際、扉体の上流側の水面上とカバー本体内とが貫通孔又は切欠部を介して連通し、扉体の上流側の水面上の空気が、貫通孔又は切欠部を通ってカバー本体内に吸い込まれ、カバー吸込口からカバー本体内に吸い込まれた水と混合され、気水混合流体となる。 According to this, when the water level on the upstream side of the door descends and reaches the upper part of the through hole or the notch before reaching the upper end of the cover suction port, the water surface on the upstream side of the door and the inside of the cover main body is communicated with through the through-hole or the notch, and the air on the water surface on the upstream side of the door is sucked into the cover body through the through-hole or the notch and into the cover body through the cover suction port. It is mixed with water and becomes a mixed fluid of air and water.

本第３発明における吸込カバーは、貫通部の上端がポンプ吸込口の中心位置以下に位置するものである。 The suction cover in the third aspect of the present invention is such that the upper end of the penetrating portion is positioned below the center position of the pump suction port.

これによると、扉体の上流側の水位が下降してカバー吸込口の上端に到達するより前に貫通部の上部に到達した際、扉体の上流側の水面上とカバー本体内とが貫通部を介して連通し、扉体の上流側の水面上の空気が、貫通部を通ってカバー本体内に吸い込まれ、カバー吸込口からカバー本体内に吸い込まれた水と混合され、気水混合流体となる。 According to this, when the water level on the upstream side of the door body descends and reaches the upper part of the penetration portion before reaching the upper end of the cover suction port, the water surface on the upstream side of the door body and the inside of the cover body penetrate. The air on the water surface on the upstream side of the door is sucked into the cover body through the penetration part and mixed with the water sucked into the cover body from the cover suction port to mix air and water. becomes fluid.

この際、貫通部の上端がポンプ吸込口の中心位置以下に位置するため、扉体の上流側の水位がポンプ吸込口の中心位置以下まで下降しないと、全量排水運転から気水混合排水運転に移行されない。これにより、モータの消費電力の変動量が小さい全量排水運転状態の水位の範囲を広くすることができるため、モータにかかる負荷が軽減される。 At this time, since the upper end of the penetrating part is positioned below the center position of the pump suction port, if the water level on the upstream side of the gate does not drop below the center position of the pump suction port, the operation will change from full discharge operation to mixed water discharge operation. Not migrated. As a result, it is possible to widen the range of the water level in the full discharge operation state in which the amount of fluctuation in the power consumption of the motor is small, thereby reducing the load on the motor.

本第４発明における吸込カバーは、側部壁に、外側方へ張り出す側方鍔部が設けられ、
側方鍔部は、カバー本体を横軸ポンプに取付けた状態で、略水平方向且つ流水路の流水方向に延びているものである。 The suction cover in the fourth aspect of the present invention is provided with a lateral brim portion projecting outward on the side wall,
The side brim portion extends substantially horizontally and in the running direction of the water channel when the cover body is attached to the horizontal shaft pump.

これによると、水位の低下に伴って、吸込カバーの外側方に旋回流が発生しても、この旋回流は側方鍔部にぶつかって減衰するため、空気吸込渦の発生を抑制することができる。 According to this, even if a swirling flow is generated on the outer side of the suction cover as the water level drops, the swirling flow collides with the lateral flange and is attenuated, so that the generation of the air suction vortex can be suppressed. can.

本第５発明は、上記第１発明から第４発明のいずれか１項に記載の吸込カバーをポンプ吸込口に取付けたことを特徴とする横軸ポンプである。 A fifth aspect of the invention is a horizontal shaft pump, wherein the suction cover according to any one of the first to fourth aspects of the invention is attached to the pump suction port.

本第６発明は、上記第５発明に記載の横軸ポンプを流水路の扉体に取付けたことを特徴とするポンプゲートである。 A sixth aspect of the present invention is a pump gate, wherein the horizontal shaft pump according to the fifth aspect is attached to a gate member of a water channel.

本第７発明は、上記第６発明に記載のポンプゲートの運転方法であって、
流水路を扉体で閉じた状態で、流水路内の水位に関わらず、横軸ポンプを一定の回転速度で運転するものである。 The seventh invention is a pump gate operation method according to the sixth invention,
With the water channel closed by a door, the horizontal shaft pump is operated at a constant rotational speed regardless of the water level in the water channel.

これによると、全量排水運転状態および気水混合排水運転のいずれの運転時においても横軸ポンプが一定の回転速度で運転されるため、モータの制御を簡単に行うことができる。 According to this, the horizontal shaft pump is operated at a constant rotational speed in both the full discharge operation state and the steam/water mixed discharge operation, so that the motor can be easily controlled.

以上のように本発明によると、気水混合排水運転時におけるモータの消費電力の変動量を低減することができ、モータにかかる負荷が軽減される。 As described above, according to the present invention, it is possible to reduce the amount of fluctuation in the power consumption of the motor during the air-water mixed drainage operation, thereby reducing the load on the motor.

本発明の第１の実施の形態における吸込カバーを備えたポンプゲートの断面図である。1 is a cross-sectional view of a pump gate with a suction cover according to the first embodiment of the invention; FIG. 同、ポンプゲートの斜視図である。It is a perspective view of a pump gate equally. 同、ポンプゲートの断面斜視図である。It is a cross-sectional perspective view of a pump gate same. 同、ポンプゲートの横軸ポンプに取付けられた吸込カバーの断面図であり、全量排水運転時を示す。FIG. 10 is a cross-sectional view of a suction cover attached to a horizontal shaft pump of the pump gate, showing a full discharge operation. 同、吸込カバーの斜視図である。It is a perspective view of a suction cover equally. 同、吸込カバーの斜視図である。It is a perspective view of a suction cover equally. 図４におけるＸ－Ｘ矢視図である。FIG. 5 is a view taken along line XX in FIG. 4; 同、ポンプゲートの横軸ポンプに取付けられた吸込カバーの断面図であり、気水混合排水運転時を示す。Fig. 10 is a cross-sectional view of the suction cover attached to the horizontal shaft pump of the pump gate, showing the air-water mixed drainage operation. 同、ポンプゲートの横軸ポンプに取付けられた吸込カバーの一部切欠き側面図であり、気水混合排水運転時を示す。FIG. 11 is a partially cutaway side view of the suction cover attached to the horizontal shaft pump of the pump gate, showing the air-water mixed drainage operation. 同、ポンプゲートの横軸ポンプの吸込水位とモータの消費電力を示すグラフである。It is a graph showing the suction water level of the horizontal axis pump of the pump gate and the power consumption of the motor. 本発明の第２の実施の形態における吸込カバーの斜視図である。It is a perspective view of the suction cover in the 2nd Embodiment of this invention. 本発明の第３の実施の形態における吸込カバーの断面図である。It is a sectional view of a suction cover in a 3rd embodiment of the present invention. 同、吸込カバーの斜視図である。It is a perspective view of a suction cover equally. 同、吸込カバーの斜視図である。It is a perspective view of a suction cover equally. 本発明の第４の実施の形態における吸込カバーの断面図である。It is a sectional view of the suction cover in a 4th embodiment of the present invention. 同、吸込カバーの斜視図である。It is a perspective view of a suction cover equally. 同、吸込カバーの斜視図である。It is a perspective view of a suction cover equally. 本発明の第５の実施の形態における吸込カバーの断面図である。It is a sectional view of the suction cover in a 5th embodiment of the present invention. 本発明の第６の実施の形態における吸込カバーの断面図である。It is a sectional view of a suction cover in a 6th embodiment of the present invention. 本発明の第７の実施の形態における吸込カバーの断面図である。It is a sectional view of a suction cover in a 7th embodiment of the present invention. 本発明の第８の実施の形態における吸込カバーの断面図である。It is a sectional view of the suction cover in an 8th embodiment of the present invention. 本発明の第９の実施の形態における吸込カバーの断面図である。It is a sectional view of the suction cover in a 9th embodiment of the present invention. 本発明の第１０の実施の形態における吸込カバーの断面図である。FIG. 20 is a cross-sectional view of a suction cover according to a tenth embodiment of the present invention; 同、吸込カバーの斜視図である。It is a perspective view of a suction cover equally. 同、吸込カバーの斜視図である。It is a perspective view of a suction cover equally. 本発明の第１１の実施の形態におけるポンプゲートの図である。It is a diagram of a pump gate in an eleventh embodiment of the present invention. 本発明の第１２の実施の形態における横軸ポンプを壁体に取り付けた流水路の平面図である。FIG. 21 is a plan view of a water channel in which a horizontal shaft pump is attached to a wall according to a twelfth embodiment of the present invention; 同、横軸ポンプを壁体に取り付けた流水路の断面図である。It is sectional drawing of the water flow path which attached the horizontal shaft pump to the wall body equally. 従来の吸込カバーを備えたポンプゲートの断面図であり、全量排水運転時を示す。FIG. 10 is a cross-sectional view of a conventional pump gate with a suction cover, showing a full discharge operation. 同、ポンプゲートの断面図であり、気水混合排水運転時を示す。It is a cross-sectional view of the pump gate of the same, showing the time of air-water mixed drainage operation. 同、ポンプゲートの横軸ポンプの吸込水位とモータの消費電力を示すグラフである。It is a graph showing the suction water level of the horizontal axis pump of the pump gate and the power consumption of the motor. 従来の別の吸込カバーの斜視図である。FIG. 11 is a perspective view of another conventional suction cover;

以下、本発明における実施の形態を、図面を参照して説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（第１の実施の形態）
第１の実施の形態では、図１～図３に示すように、１は流水路２に設置されたポンプゲートである。流水路２は、吸込側水路の一例である支川側水路３と、吐出側水路の一例である本川側水路４とを有している。ポンプゲート１は、支川側水路３と本川側水路４との境界部にあり、流水路２を開閉する扉体１０と、扉体１０を昇降させる昇降装置１１とを有している。 (First embodiment)
In the first embodiment, 1 is a pump gate installed in a running water channel 2, as shown in FIGS. The flow channel 2 has a tributary channel 3 which is an example of a suction channel and a main channel 4 which is an example of a discharge channel. The pump gate 1 is located at the boundary between the tributary channel 3 and the main channel 4, and has a door 10 for opening and closing the flowing channel 2 and an elevator 11 for raising and lowering the door 10.

扉体１０には、扉体１０の幅方向Ｗにおいて２台（複数台）の横軸ポンプ１２が並列に設けられている。図１の仮想線で示すように、扉体１０を上昇させた開放状態で、水が支川側水路３から本川側水路４へ自然流下し、また、図１の実線で示すように、増水により本川側水路４の水位が支川側水路３の水位よりも上昇したときに、扉体１０を下降させた閉鎖状態で、横軸ポンプ１２を作動して、支川側水路３から本川側水路４へ水を強制的に移送する。 Two (a plurality of) horizontal pumps 12 are provided in parallel in the width direction W of the door 10 . As shown by the imaginary line in FIG. 1, in the open state with the gate 10 raised, water naturally flows down from the tributary channel 3 to the main channel 4, and as shown by the solid line in FIG. When the water level of the main river side channel 4 rises above the water level of the tributary side channel 3, the horizontal shaft pump 12 is operated in the closed state where the gate body 10 is lowered, and the horizontal shaft pump 12 is operated to move the water level from the tributary channel 3 to the main river side. Water is forcibly transferred to the channel 4.

横軸ポンプ１２は、ポンプ軸心１５を水平方向にして扉体１０に取り付けられており、円筒状のケーシング１６と、ケーシング１６内に設けられた羽根車１７と、羽根車１７を回転させるモータ１８とを有している。ケーシング１６は、上流側端部にポンプ吸込口１９を有し、下流側端部にポンプ吐出口２０を有している。 The horizontal shaft pump 12 is attached to the door 10 with the pump axis 15 in the horizontal direction. 18. The casing 16 has a pump suction port 19 at its upstream end and a pump discharge port 20 at its downstream end.

尚、ケーシング１６の吸込側端部には、円環状の吸込側フランジ２１が設けられている。また、ケーシング１６の吐出側端部には、ポンプ吐出口２０を開閉する弁としての機能を有する揺動自在なフラップゲート２２が設けられている。 An annular suction-side flange 21 is provided at the suction-side end of the casing 16 . A swingable flap gate 22 that functions as a valve for opening and closing the pump discharge port 20 is provided at the discharge side end of the casing 16 .

横軸ポンプ１２のポンプ吸込口１９には吸込カバー３０が取り付けられている。吸込カバー３０は、ポンプ吸込口１９の前方を下部が開口された状態で覆う金属製のカバー本体３１を有している。 A suction cover 30 is attached to the pump suction port 19 of the horizontal shaft pump 12 . The suction cover 30 has a metal cover main body 31 that covers the front of the pump suction port 19 with its lower portion opened.

図４～図８に示すように、カバー本体３１は、ポンプ吸込口１９に取付可能であり且つポンプ吸込口１９からポンプ軸心１５に略垂直な方向（ポンプ軸心に交差する方向の一例）で外側方へ張り出す後部壁３３と、後部壁３３の両側縁からポンプ軸心方向３４の上流側へ延びる左右一対の側部壁３５と、後部壁３３の上縁からポンプ軸心方向３４の上流側へ下り勾配で延びて、両方の側部壁３５の上縁間に設けられた上部壁３７とを有している。 As shown in FIGS. 4 to 8, the cover main body 31 can be attached to the pump suction port 19 and extends from the pump suction port 19 in a direction substantially perpendicular to the pump axis 15 (an example of a direction crossing the pump axis). a pair of left and right side walls 35 extending upstream in the pump axial direction 34 from both side edges of the rear wall 33; It has an upper wall 37 extending downwardly to the upstream side and provided between the upper edges of both side walls 35 .

両方の側部壁３５の下縁間で且つ後部壁３３の下縁と上部壁３７の上流側先端縁との間には、下向きに開口した四角形のカバー吸込口３９が形成されている。 Between the lower edges of both side walls 35 and between the lower edge of the rear wall 33 and the upstream edge of the upper wall 37, a downwardly opening square cover suction port 39 is formed.

上部壁３７は、その上流側先端縁に、前方鍔部３７ａを有している。前方鍔部３７ａは、カバー本体３１を横軸ポンプ１２に取付けた状態で、略水平方向且つ前方に延びている。 The upper wall 37 has a front brim portion 37a at its upstream tip edge. The front collar portion 37 a extends substantially horizontally and forward when the cover body 31 is attached to the horizontal shaft pump 12 .

後部壁３３は、四角形の板であり、複数のボルト、ナット（図示省略）によって横軸ポンプ１２の吸込側フランジ２１に取付けられている。後部壁３３には、ポンプ吸込口１９と同じ位置でポンプ吸込口１９とほぼ同じ大きさの円形状のカバー開口部４２と、カバー本体３１の内外に貫通する複数の貫通孔４４（貫通部の一例）とが形成されている。 The rear wall 33 is a square plate and is attached to the suction side flange 21 of the horizontal shaft pump 12 with a plurality of bolts and nuts (not shown). The rear wall 33 has a circular cover opening 42 at the same position as the pump suction port 19 and having substantially the same size as the pump suction port 19, and a plurality of through holes 44 penetrating the cover main body 31 from inside to outside. example) is formed.

貫通孔４４は、上下方向に長い長方形状であり、カバー開口部４２の両側方に位置している。カバー本体３１をポンプ吸込口１９に取付けた状態で、貫通孔４４の上部がカバー吸込口３９の上端位置Ａよりも上方に位置するとともに、貫通孔４４の上端がポンプ吸込口１９の中心位置Ｂよりも下方に位置する。 The through-holes 44 have a rectangular shape elongated in the vertical direction, and are positioned on both sides of the cover opening 42 . With the cover main body 31 attached to the pump suction port 19 , the upper portion of the through hole 44 is located above the upper end position A of the cover suction port 39 , and the upper end of the through hole 44 is located at the center position B of the pump suction port 19 . located below.

尚、カバー吸込口３９の上端位置Ａは上部壁３７の上流側先端縁３７ａの位置に相当し、ポンプ吸込口１９の中心位置Ｂはポンプ軸心１５の位置に相当しており、カバー吸込口３９の上端位置Ａはポンプ吸込口１９の中心位置Ｂよりも下位である。 The position A of the upper end of the cover suction port 39 corresponds to the position of the upstream edge 37a of the upper wall 37, and the central position B of the pump suction port 19 corresponds to the position of the pump axis 15. The upper end position A of 39 is lower than the center position B of the pump suction port 19 .

以下、上記構成における作用を説明する。 The operation of the above configuration will be described below.

図１の実線に示すように、扉体１０を下降して流水路２を閉じ、横軸ポンプ１２が扉体１０の上流側である支川側水路３の水面下に没している状態で、横軸ポンプ１２を定格回転速度（一定の回転速度の一例）で作動させて全量排水運転を行っている際、支川側水路３の水が、吸込カバー３０のカバー吸込口３９から横軸ポンプ１２内に吸い込まれ、フラップゲート２２を押し開いて、ポンプ吐出口２０から扉体１０の下流側である本川側水路４へ排出される。 As shown by the solid line in FIG. 1, the gate 10 is lowered to close the water channel 2, and the horizontal shaft pump 12 is submerged under the water surface of the tributary channel 3 upstream of the gate 10. When the horizontal shaft pump 12 is operated at a rated rotational speed (an example of a constant rotational speed) and the total amount of water is discharged, the water in the tributary channel 3 flows from the cover suction port 39 of the suction cover 30 into the horizontal shaft pump 12. The water is sucked inside, pushes open the flap gate 22, and is discharged from the pump discharge port 20 to the main river side water channel 4 downstream of the gate 10. - 特許庁

その後、図８，図９に示すように、支川側水路３の水位ＷＬ１が下降してカバー吸込口３９の上端位置Ａに到達するより前に貫通孔４４の上部に到達した際、支川側水路３の水面上とカバー本体３１内とが貫通孔４４を介して連通し、支川側水路３の水面上の空気４６が、貫通孔４４を通ってカバー本体３１内に流入し、カバー吸込口３９からカバー本体３１内に吸い込まれた水と混合され、気水混合流体となる。 Thereafter, as shown in FIGS. 8 and 9, when the water level WL1 of the tributary channel 3 descends and reaches the top of the through hole 44 before reaching the upper end position A of the cover suction port 39, the tributary channel 3 communicates with the inside of the cover main body 31 through the through hole 44 , and the air 46 above the water surface of the tributary side waterway 3 flows into the cover main body 31 through the through hole 44 , and the cover suction port 39 . is mixed with water sucked into the cover main body 31 from the air-water mixed fluid.

この気水混合流体は、カバー本体３１内からポンプ吸込口１９を通って横軸ポンプ１２内を流れ、フラップゲート２２を押し開いて、ポンプ吐出口２０から扉体１０の下流側である本川側水路４へ排出される。このような気水混合排水運転時において、モータ１８の消費電力の変動量が低減される。この理由は以下のように考えられる。 This air-water mixed fluid flows from inside the cover main body 31 through the pump suction port 19 inside the horizontal shaft pump 12, pushes the flap gate 22 open, and flows from the pump discharge port 20 to the main river downstream of the door 10. It is discharged to the side waterway 4. During such air-water mixed drainage operation, the amount of fluctuation in power consumption of the motor 18 is reduced. The reason for this is considered as follows.

上記のような気水混合排水運転時においては、図８，図９に示すように、貫通孔４４がカバー本体３１の後部壁３３に形成されているため、貫通孔４４はポンプ吸込口１９の直近に位置することになる。これにより、貫通孔４４からカバー本体３１内に流入した空気４６は、浮上してカバー本体３１内の上部に集中する以前に、小さな気泡のまま分散した状態で羽根車１７に流入し、羽根車１７によって粉砕される。 During the air-water mixed drainage operation as described above, as shown in FIGS. will be located in the immediate vicinity. As a result, the air 46 that has flowed into the cover main body 31 from the through hole 44 flows into the impeller 17 in a dispersed state as small bubbles before floating and concentrating in the upper part of the cover main body 31, and pulverized by 17.

さらに、貫通孔４４からカバー本体３１内に吸い込まれる水の流れ方向は吸込カバー３０のカバー吸込口３９からカバー本体３１内に吸い込まれる水の流れ方向とは逆方向になるため、貫通孔４４からカバー本体３１内に吸い込まれる水の流速は小さく、渦による空気の吸い込みも軽減される。 Furthermore, since the direction of flow of water sucked into the cover body 31 through the through hole 44 is opposite to the direction of flow of water sucked into the cover body 31 through the cover suction port 39 of the suction cover 30, The flow velocity of the water sucked into the cover body 31 is small, and the sucking of air by the vortex is also reduced.

これにより、空気４６が貫通孔４４を通じて安定してカバー本体３１内に流入するので、カバー本体３１内の上部に空気溜まりが発生するのを抑制することができ、空気溜まりの空気が大きな気泡となって一気に羽根車１７に流入するのを防止することができる。このため、羽根車１７にかかる負荷の変動量が小さくなり、これに伴って、気水混合排水運転時におけるモータ１８の消費電力の変動量が低減され、モータ１８にかかる負荷が軽減される。 As a result, the air 46 stably flows into the cover main body 31 through the through holes 44, so that it is possible to suppress the occurrence of air pockets in the upper part of the cover main body 31, and the air in the air pockets can be turned into large bubbles. It is possible to prevent the water from flowing into the impeller 17 at once. Therefore, the amount of fluctuation in the load applied to the impeller 17 is reduced, and along with this, the amount of fluctuation in power consumption of the motor 18 during the air-water mixed drainage operation is reduced, and the load applied to the motor 18 is reduced.

尚、図１０のグラフＧ１は横軸ポンプ１２を定格回転速度で作動させた時の吸込水位［ｍ］を示し、グラフＧ２はモータ１８の消費電力［ｋＷ］を示している。吸込水位とは吸込側である支川側水路３の水位であり、グラフＧ１，Ｇ２の横軸は横軸ポンプ１２の運転時間（稼動時間［秒］）を示している。 Graph G1 in FIG. 10 shows the suction water level [m] when the horizontal shaft pump 12 is operated at the rated rotation speed, and graph G2 shows the power consumption [kW] of the motor 18. As shown in FIG. The suction water level is the water level of the tributary channel 3 on the suction side, and the horizontal axis of the graphs G1 and G2 indicates the operating time (operating time [seconds]) of the horizontal pump 12 .

図１に示した横軸ポンプ１２が支川側水路３の水面下に没した全量排水運転の状態から、図８，図９に示すように、支川側水路３の水面が次第に下降して貫通孔４４の上部に到達した際、支川側水路３の水面上の空気４６が貫通孔４４を通ってカバー本体３１内に吸い込まれ、気水混合排水運転に切り換わる。 From the state of full discharge operation in which the horizontal shaft pump 12 shown in FIG. 44, the air 46 on the water surface of the tributary channel 3 is sucked into the cover main body 31 through the through hole 44, and the operation is switched to air-water mixed drainage operation.

その後、支川側水路３の水面がさらに下降してカバー吸込口３９の上端位置Ａ以下になった際、排水待機運転に切り換わる。尚、排水待機運転では、フラップゲート２２が閉鎖し、ポンプ吐出口２０から本川側水路４への排水は行われない。 After that, when the water surface of the tributary side water channel 3 further descends and becomes equal to or lower than the upper end position A of the cover suction port 39, the operation is switched to the drainage standby operation. In the drainage standby operation, the flap gate 22 is closed and no drainage is performed from the pump discharge port 20 to the main river channel 4 .

図１０のグラフＧ２によると、気水混合排水運転時におけるモータ１８の消費電力の変動量Ｄ１が、図３１のグラフＧ６で示した従来のモータ１１３の消費電力の変動量Ｄに比べて、低減されている。 According to the graph G2 in FIG. 10, the fluctuation amount D1 of the power consumption of the motor 18 during the air-water mixed drainage operation is reduced compared to the fluctuation amount D of the power consumption of the conventional motor 113 shown in the graph G6 of FIG. It is

また、貫通孔４４の上端がポンプ吸込口１９の中心位置Ｂよりも下方に位置しているため、全量排水運転状態の水位範囲を広く確保しつつ、支川側水路３の水位がポンプ吸込口１９の中心位置Ｂの下方まで下降して、全量排水運転から気水混合排水運転に移行された際も、モータ１８の消費電力の変動量が小さく抑えられるため、全水位範囲にわたってモータ１８にかかる負荷が軽減される。 Further, since the upper end of the through-hole 44 is positioned below the center position B of the pump suction port 19, the water level of the tributary side water channel 3 is maintained at the pump suction port 19 while ensuring a wide water level range in the full discharge operation state. , and the power consumption of the motor 18 can be kept small even when the full water discharge operation is shifted to the air-water mixed water discharge operation. is reduced.

図１０のグラフは、支川側水路３の水面が次第に下降して全量排水運転から気水混合排水運転を経て排水待機運転に至る際のモータ１８の消費電力の変化を示しているが、これとは逆に、支川側水路３の水面が次第に上昇して排水待機運転から気水混合排水運転を経て全量排水運転に至る際のモータ１８の消費電力の変化も同様の傾向を示す。
（第２の実施の形態）
第２の実施の形態では、図１１に示すように、両方の側部壁３５にはそれぞれ、外側方へ張り出す側方鍔部４９が設けられている。両側方鍔部４９はそれぞれ、カバー本体３１を横軸ポンプ１２に取付けた状態で、略水平方向且つ流水路２の流水方向５（前後方向）に延びている。 The graph of FIG. 10 shows the change in the power consumption of the motor 18 when the water surface of the tributary channel 3 gradually descends, from the total discharge operation to the steam-water mixed discharge operation, and then to the discharge standby operation. Conversely, the change in the power consumption of the motor 18 when the water surface of the tributary side waterway 3 gradually rises from the drainage standby operation to the steam-water mixed drainage operation to the full drainage operation shows the same tendency.
(Second embodiment)
In the second embodiment, as shown in FIG. 11, both side walls 35 are provided with side flanges 49 projecting outward. The side flanges 49 each extend substantially horizontally and in the water flow direction 5 (front-rear direction) of the water flow passage 2 in a state where the cover body 31 is attached to the horizontal shaft pump 12 .

また、後部壁３３には、カバー本体３１内において後部壁３３から上流側へ延びる平板状のバッフル５０が設けられている。 Further, the rear wall 33 is provided with a flat baffle 50 extending upstream from the rear wall 33 within the cover body 31 .

これによると、支川側水路３の水位ＷＬ１の低下に伴って、吸込カバー３０の外側方に旋回流が発生しても、この旋回流は側方鍔部４９にぶつかって減衰するため、空気吸込渦の発生を抑制することができる。 According to this, even if a swirling flow is generated on the outer side of the suction cover 30 as the water level WL1 of the tributary side water channel 3 decreases, the swirling flow collides with the side collar portion 49 and is attenuated, so that the air is sucked. It is possible to suppress the generation of eddies.

また、支川側水路３の水がカバー本体３１内からカバー開口部４２を通って横軸ポンプ１２のポンプ吸込口１９に流れ込む際、水の旋回がバッフル５０によってじゃまされるため、ポンプ吸込口１９の上流側前方に水中渦が発生するのを抑制することができる。さらには、吸込側の水の流れが整流されることにより、ポンプ効率を高めることができる。
（第３の実施の形態）
第３の実施の形態では、図１２～図１４に示すように、後部壁３３の上部隅部が、直角形状ではなく、円弧形状に形成されている。また、上部壁３７は、下流側後部が後部壁３３と同様に円弧形状に形成され、上流側前部が平板状で傾斜している。 Further, when the water in the tributary channel 3 flows from the inside of the cover main body 31 through the cover opening 42 into the pump suction port 19 of the horizontal shaft pump 12, the swirling of the water is obstructed by the baffle 50. It is possible to suppress the generation of an underwater vortex in front of the upstream side of the. Furthermore, pump efficiency can be improved by rectifying the flow of water on the suction side.
(Third Embodiment)
In the third embodiment, as shown in FIGS. 12 to 14, the upper corners of the rear wall 33 are arcuate rather than rectangular. The upper wall 37 has a downstream rear portion formed in an arc shape like the rear wall 33, and an upstream front portion formed in a flat plate shape and inclined.

これによると、第１の実施の形態と同様の作用および効果が得られる。
（第４の実施の形態）
第４の実施の形態では、図１５～図１７に示すように、後部壁３３の上部が半円形状に形成されている。また、上部壁３７は、下流側後部が後部壁３３と同様に半円形状に形成され、上流側前部が平板状で傾斜している。また、貫通孔４４は、下方ほど扉体１０の幅方向Ｗへ拡大した三角形状である。 According to this, the same actions and effects as those of the first embodiment can be obtained.
(Fourth embodiment)
In the fourth embodiment, as shown in FIGS. 15-17, the upper portion of the rear wall 33 is formed in a semicircular shape. The upper wall 37 has a semicircular downstream rear portion and an upstream front portion that is flat and inclined. Further, the through hole 44 has a triangular shape expanding in the width direction W of the door body 10 toward the lower side.

これによると、第１の実施の形態と同様の作用および効果が得られる。 According to this, the same actions and effects as those of the first embodiment can be obtained.

尚、上記第１～第３の実施の形態では、長方形状の貫通孔４４を形成しているが、長方形状に限定されるものではなく、上記第４の実施の形態で示したような三角形状の貫通孔４４又は円形状の貫通孔４４を形成してもよい。或いは、円形のカバー開口部４２の周縁と同様なカーブを描く円弧形状の貫通孔４４であってもよい。 In addition, in the first to third embodiments, the rectangular through-hole 44 is formed. Shaped through holes 44 or circular through holes 44 may be formed. Alternatively, it may be an arc-shaped through-hole 44 that draws a curve similar to the circumference of the circular cover opening 42 .

また、上記第１～第４の実施の形態では、貫通孔４４の上端がポンプ吸込口１９の中心位置Ｂよりも下方に位置しているが、貫通孔４４の上端がポンプ吸込口１９の中心位置Ｂと同じ高さにあってもよい。
（第５の実施の形態）
第５の実施の形態では、図１８に示すように、貫通孔４４は上下複数個の分割孔４４ａ～４４ｃを有している。このうち、最上段の貫通孔４４ａはポンプ吸込口１９の中心位置Ｂよりも下方に位置している。 In addition, in the first to fourth embodiments, the upper end of the through hole 44 is located below the center position B of the pump suction port 19, but the upper end of the through hole 44 is located at the center of the pump suction port 19. It may be at the same height as position B.
(Fifth embodiment)
In the fifth embodiment, as shown in FIG. 18, the through hole 44 has a plurality of upper and lower split holes 44a-44c. Among them, the uppermost through-hole 44 a is located below the center position B of the pump suction port 19 .

これによると、第１の実施の形態と同様の作用および効果が得られる。
（第６の実施の形態）
上記第１～第５の実施の形態では、貫通部の一例として貫通孔４４を後部壁３３に形成したが、貫通孔４４の代わりに、第６の実施の形態では図１９に示すように、後部壁３３の下縁から上方に延びる長方形状の切欠部５５（貫通部の別の例）が形成されている。尚、切欠部５５の上端はポンプ吸込口１９の中心位置Ｂよりも下方に位置している。 According to this, the same actions and effects as those of the first embodiment can be obtained.
(Sixth embodiment)
In the first to fifth embodiments, the through hole 44 was formed in the rear wall 33 as an example of the through portion, but instead of the through hole 44 in the sixth embodiment, as shown in FIG. A rectangular notch 55 (another example of a through portion) is formed extending upward from the lower edge of the rear wall 33 . Note that the upper end of the notch 55 is located below the center position B of the pump suction port 19 .

これによると、第１の実施の形態と同様の作用および効果が得られる。尚、気水混合排水運転時において、支川側水路３の水面上の空気が、切欠部５５を通ってカバー本体３１内に吸い込まれ、カバー吸込口３９からカバー本体３１内に吸い込まれた水と混合され、気水混合流体となる。 According to this, the same actions and effects as those of the first embodiment can be obtained. During the air-water mixed drainage operation, the air above the water surface of the tributary channel 3 is sucked into the cover main body 31 through the notch 55, and the water sucked into the cover main body 31 through the cover suction port 39. They are mixed to form an air-water mixed fluid.

上記第６の実施の形態では長方形状の切欠部５５を形成しているが、長方形状に限定されるものではなく、三角形状又は円形状の切欠部５５であってもよい。或いは、円形のカバー開口部４２の周縁と同様なカーブを描く円弧形状の切欠部５５であってもよい。
（第７の実施の形態）
上記第１～４の実施の形態では、貫通孔４４の上端がポンプ吸込口１９の中心位置Ｂよりも下方に位置しているが、第７の実施の形態では、図２０に示すように、貫通孔４４の上端がポンプ吸込口１９の中心位置Ｂよりも上方に位置している。 Although the rectangular notch 55 is formed in the sixth embodiment, the notch 55 is not limited to a rectangular shape, and may be triangular or circular. Alternatively, it may be an arc-shaped notch 55 that draws a curve similar to the circumference of the circular cover opening 42 .
(Seventh embodiment)
In the first to fourth embodiments, the upper end of the through hole 44 is located below the center position B of the pump suction port 19, but in the seventh embodiment, as shown in FIG. The upper end of the through hole 44 is located above the center position B of the pump suction port 19 .

これによると、気水混合排水運転状態になる水位範囲は広くなるが、第１の実施の形態と同様の作用および効果が得られる。
（第８の実施の形態）
上記第５の実施の形態では図１８に示すように最上段の貫通孔４４ａがポンプ吸込口１９の中心位置Ｂよりも下方に位置しているが、第８の実施の形態では、図２１に示すように、最上段の貫通孔４４ａがポンプ吸込口１９の中心位置Ｂよりも上方に位置している。 According to this, although the water level range in which the air-water mixed drainage operation state is established is widened, the same action and effect as those of the first embodiment can be obtained.
(Eighth embodiment)
In the fifth embodiment, as shown in FIG. 18, the uppermost through-hole 44a is located below the center position B of the pump suction port 19. However, in the eighth embodiment, as shown in FIG. As shown, the uppermost through-hole 44 a is located above the center position B of the pump suction port 19 .

これによると、第１の実施の形態と同様の作用および効果が得られる。
（第９の実施の形態）
上記第６の実施の形態では図１９に示すように切欠部５５の上端がポンプ吸込口１９の中心位置Ｂよりも下方に位置しているが、第９の実施の形態では、図２２に示すように、切欠部５５の上端がポンプ吸込口１９の中心位置Ｂよりも上方に位置している。 According to this, the same actions and effects as those of the first embodiment can be obtained.
(Ninth embodiment)
In the sixth embodiment, the upper end of the notch 55 is located below the center position B of the pump suction port 19 as shown in FIG. 19, but in the ninth embodiment, as shown in FIG. , the upper end of the notch 55 is located above the center position B of the pump suction port 19. As shown in FIG.

これによると、第１の実施の形態と同様の作用および効果が得られる。
（第１０の実施の形態）
第１０の実施の形態では、図２３～図２５に示すように、後部壁３３に三角形の切欠部５５が形成され、切欠部５５の上端がポンプ吸込口１９の中心位置Ｂよりも下方に位置している。また、後部壁３３の上部隅部が、直角形状ではなく、円弧形状に形成されている。さらに、上部壁３７は、下流側後部が後部壁３３と同様に円弧形状に形成され、上流側前部が平板状で傾斜している。 According to this, the same actions and effects as those of the first embodiment can be obtained.
(Tenth embodiment)
In the tenth embodiment, as shown in FIGS. 23 to 25, a triangular cutout 55 is formed in the rear wall 33, and the upper end of the cutout 55 is positioned below the center position B of the pump suction port 19. is doing. Also, the upper corners of the rear wall 33 are formed in an arc shape instead of a right angle shape. Further, the upper wall 37 has a downstream rear portion formed in an arc shape like the rear wall 33, and an upstream front portion formed in a flat plate shape and inclined.

これによると、第１の実施の形態と同様の作用および効果が得られる。
（第１１の実施の形態）
上記第１～第１０の実施の形態では、図１に示すように横軸ポンプ１２はポンプ軸心１５を水平方向にして扉体１０に取り付けられているが、図２６に示すように、第１１の実施の形態では、横軸ポンプ１２は、吸込側が下になり吐出側が上になるように、ポンプ軸心１５を傾斜させて扉体１０に取り付けられている。 According to this, the same actions and effects as those of the first embodiment can be obtained.
(Eleventh embodiment)
In the first to tenth embodiments, as shown in FIG. 1, the horizontal shaft pump 12 is attached to the door 10 with the pump axis 15 in the horizontal direction, but as shown in FIG. In the eleventh embodiment, the horizontal shaft pump 12 is attached to the door 10 with the pump axis 15 tilted so that the suction side faces downward and the discharge side faces upward.

これによると、第１の実施の形態と同様の作用および効果が得られる。 According to this, the same actions and effects as those of the first embodiment can be obtained.

尚、上記第１～第１０の実施の形態において、上記のように横軸ポンプ１２のポンプ軸心１５を傾斜させてもよく、本実施の形態において、横軸ポンプ１２のポンプ軸心１５を水平方向にしてもよい。 In the first to tenth embodiments, the pump axis 15 of the horizontal pump 12 may be tilted as described above. It can be horizontal.

但し、ポンプ軸心１５を水平方向にした形態と傾斜させた形態とでは、ポンプ吸込口１９とカバー吸込口３９と貫通部（貫通孔４４，切欠部５５）との間で高さ位置の関係が変化するため、設定や製作においては注意が必要である。
（第１２の実施の形態）
上記第１～第１１の実施の形態では、図１に示すように横軸ポンプ１２は流水路２に設けられた扉体１０に取付けられているが、以下に説明する第１２の実施の形態では、図２７，図２８に示すように、横軸ポンプ１２は流水路２に設けられた壁体６０に取付けられている。 However, depending on whether the pump axis 15 is horizontal or inclined, the height position relationship between the pump suction port 19, the cover suction port 39, and the through portions (the through hole 44 and the notch portion 55) is different. changes, so care must be taken in setting and production.
(Twelfth embodiment)
In the first to eleventh embodiments, as shown in FIG. 1, the horizontal shaft pump 12 is attached to the door member 10 provided in the water flow passage 2. However, in the twelfth embodiment described below, Now, as shown in FIGS. 27 and 28, the horizontal shaft pump 12 is attached to the wall 60 provided in the water flow passage 2. As shown in FIG.

すなわち、流水路２は、主流水路６１と、主流水路６１に並列に形成された副流水路６２とを有している。主流水路６１は途中で分岐して副流水路６２の上流側に連通し、副流水路６２の下流側が主流水路６１に合流している。そして、壁体６０は流水路２の副流水路６２に設けられている。 That is, the water channel 2 has a main water channel 61 and a side water channel 62 formed in parallel with the main water channel 61 . The main water channel 61 branches off midway to communicate with the upstream side of the side water channel 62 , and the downstream side of the side water channel 62 merges with the main water channel 61 . The wall 60 is provided in a side water channel 62 of the water channel 2 .

尚、横軸ポンプ１２のポンプ吸込口１９には吸込カバー３０が取り付けられている。また、主流水路６１から副流水路６２への分岐箇所と副流水路６２から主流水路６１への合流箇所との間には、主流水路６１を開閉する開閉機構６３が設けられている。 A suction cover 30 is attached to the pump suction port 19 of the horizontal shaft pump 12 . An opening/closing mechanism 63 for opening and closing the main waterway 61 is provided between the branch point where the main waterway 61 branches to the side waterway 62 and the junction point where the side waterway 62 joins the main waterway 61 .

これによると、主流水路６１の下流側の水位が上流側の水位よりも低い通常時の場合、開閉機構６３により主流水路６１を開いた状態で横軸ポンプ１２が停止しており、主流水路６１の水は上流側から下流側へ正常に流れる。 According to this, when the water level on the downstream side of the main water channel 61 is normally lower than the water level on the upstream side, the horizontal shaft pump 12 is stopped with the main water channel 61 opened by the opening/closing mechanism 63, and the main water channel 61 water flows normally from upstream to downstream.

例えば大雨等の増水によって主流水路６１の下流側の水位が上流側の水位よりも高くなった場合、開閉機構６３により主流水路６１を閉塞させるとともに、横軸ポンプ１２を定格回転速度で作動させる。これにより、主流水路６１の水が下流側から上流側に逆流するのを防止することができるとともに、壁体６０の上流側の水が横軸ポンプ１２を通って壁体６０の下流側に流れるため、主流水路６１の上流側の水が強制的に副流水路６２を経由して主流水路６１の下流側に排水される。 For example, when the water level on the downstream side of the main water channel 61 becomes higher than the water level on the upstream side due to a flood such as heavy rain, the opening/closing mechanism 63 closes the main water channel 61 and operates the horizontal shaft pump 12 at the rated rotation speed. As a result, the water in the main water channel 61 can be prevented from flowing backward from the downstream side to the upstream side, and the water on the upstream side of the wall 60 flows through the horizontal shaft pump 12 to the downstream side of the wall 60. Therefore, the water on the upstream side of the main water channel 61 is forcibly discharged to the downstream side of the main water channel 61 via the side water channel 62 .

さらに、横軸ポンプ１２のポンプ吸込口１９に吸込カバー３０を取り付けているため、第１の実施の形態と同様の作用および効果が得られる。 Furthermore, since the suction cover 30 is attached to the pump suction port 19 of the horizontal shaft pump 12, the same actions and effects as in the first embodiment can be obtained.

上記第１の実施の形態では、図１に示すように、流水路２を区画する扉体１０に貫通するように横軸ポンプ１２が設置されており、上記第１２の実施の形態では、図２８に示すように、流水路２を区画する壁体６０に貫通するように横軸ポンプ１２が設置されているが、横軸ポンプ１２の設置箇所はこれらに限定されるものではなく、例えば、横軸ポンプ１２が水槽内に設置されていてもよい。この場合、横軸ポンプ１２の吐出側に上下方向の揚水管が接続され、揚水管の下流側に水平方向の吐出管が接続され、水槽内の水が、横軸ポンプ１２に吸い込まれ、横軸ポンプ１２から揚水管および吐出管を通って、吐出管の下流側にある別の水槽或いは流水路等に排水されるものであってもよい。 In the first embodiment, as shown in FIG. 1, the horizontal shaft pump 12 is installed so as to pass through the door 10 that partitions the water flow passage 2. In the twelfth embodiment, as shown in FIG. As shown in 28, the horizontal shaft pump 12 is installed so as to penetrate the wall 60 that partitions the water flow passage 2, but the installation location of the horizontal shaft pump 12 is not limited to this. A horizontal shaft pump 12 may be installed in the water tank. In this case, a vertical pumping pipe is connected to the discharge side of the horizontal shaft pump 12, and a horizontal pumping pipe is connected to the downstream side of the pumping pipe. The water may be drained from the shaft pump 12 through a riser pipe and a discharge pipe to another water tank, running water channel, or the like downstream of the discharge pipe.

上記各実施の形態では、吸込カバー３０の後部壁３３がポンプ吸込口１９からポンプ軸心１５に略垂直な方向で外側方へ張り出しているが、略垂直な方向とは垂直方向および垂直に近い方向を含む。また、前方鍔部３７ａはカバー本体３１を横軸ポンプ１２に取付けた状態で略水平方向に延びているが、略水平方向とは水平方向および水平に近い方向を含む。 In each of the above-described embodiments, the rear wall 33 of the suction cover 30 protrudes outward from the pump suction port 19 in a direction substantially perpendicular to the pump axis 15. Including direction. Further, the front flange portion 37a extends substantially horizontally when the cover body 31 is attached to the horizontal shaft pump 12, but the substantially horizontal direction includes a horizontal direction and a direction close to the horizontal.

１ ポンプゲート
２ 流水路
１０ 扉体
１２ 横軸ポンプ
１５ ポンプ軸心
１９ ポンプ吸込口
３０ 吸込カバー
３１ カバー本体
３３ 後部壁
３４ ポンプ軸心方向
３５ 側部壁
３７ 上部壁
３９ カバー吸込口
４４ 貫通孔（貫通部）
４９ 側方鍔部
５５ 切欠部（貫通部）
６０ 壁体
Ａ カバー吸込口の上端位置
Ｂ ポンプ吸込口の中心位置 1 pump gate 2 running water passage 10 door 12 horizontal shaft pump 15 pump axis 19 pump suction port 30 suction cover 31 cover main body 33 rear wall 34 pump axial direction 35 side wall 37 upper wall 39 cover suction port 44 through hole ( penetrating part)
49 Side flange 55 Notch (penetration)
60 Wall body A Upper end position of cover suction port B Center position of pump suction port

Claims (7)

流水路内又は水槽内に配置される横軸ポンプのポンプ吸込口のカバーであって、
ポンプ吸込口の前方を下部が開口された状態で覆うカバー本体を有し、
カバー本体は、ポンプ吸込口に取付可能であり且つポンプ吸込口からポンプ軸心に交差する方向で外側方へ張り出す後部壁と、後部壁の両側縁からポンプ軸心方向の上流側へ延びる一対の側部壁と、後部壁の上縁からポンプ軸心方向の上流側へ下り勾配で延びて、両方の側部壁の上縁間に設けられた上部壁とを有し、
両方の側部壁の下縁間で且つ後部壁の下縁と上部壁の先端縁との間に、下向きに開口したカバー吸込口が形成され、
後部壁に、カバー本体の内外に貫通する貫通部が形成され、
カバー本体をポンプ吸込口に取付けた状態で、貫通部の少なくとも上部がカバー吸込口の上端位置よりも上方に位置することを特徴とする吸込カバー。 A cover for a pump suction port of a horizontal shaft pump arranged in a running water channel or a water tank,
Having a cover body covering the front of the pump suction port with the lower part opened,
The cover body includes a rear wall that can be attached to the pump suction port and projects outward from the pump suction port in a direction that intersects the pump axis, and a pair of covers that extend upstream in the pump axis direction from both side edges of the rear wall. and an upper wall extending downwardly from the upper edge of the rear wall to the upstream side in the axial direction of the pump and provided between the upper edges of both side walls,
a downwardly opening cover inlet is formed between the lower edges of both side walls and between the lower edge of the rear wall and the leading edge of the upper wall;
The rear wall is formed with a penetrating portion that penetrates the inside and outside of the cover body,
A suction cover, wherein at least an upper portion of the through portion is located above an upper end position of the cover suction port in a state where the cover body is attached to the pump suction port. 貫通部は、貫通孔、又は、後部壁の下縁から上方に延びる切欠部であることを特徴とする請求項１記載の吸込カバー。 2. The suction cover according to claim 1, wherein the through portion is a through hole or a notch extending upward from the lower edge of the rear wall. 貫通部の上端がポンプ吸込口の中心位置以下に位置することを特徴とする請求項１又は請求項２に記載の吸込カバー。 3. The suction cover according to claim 1, wherein the upper end of the through portion is positioned below the center position of the pump suction port. 側部壁に、外側方へ張り出す側方鍔部が設けられ、
側方鍔部は、カバー本体を横軸ポンプに取付けた状態で、略水平方向且つ流水路の流水方向に延びていることを特徴とする請求項１から請求項３のいずれか１項に記載の吸込カバー。 The side walls are provided with side brim portions projecting outward,
4. The side brim portion according to any one of claims 1 to 3, wherein the side brim portion extends substantially horizontally and in the running direction of the running water channel in a state where the cover body is attached to the horizontal shaft pump. suction cover. 上記請求項１から請求項４のいずれか１項に記載の吸込カバーをポンプ吸込口に取付けたことを特徴とする横軸ポンプ。 A horizontal shaft pump, wherein the suction cover according to any one of claims 1 to 4 is attached to the pump suction port. 上記請求項５に記載の横軸ポンプを流水路の扉体に取付けたことを特徴とするポンプゲート。 A pump gate, wherein the horizontal shaft pump according to claim 5 is attached to a gate member of a water channel. 上記請求項６に記載のポンプゲートの運転方法であって、
流水路を扉体で閉じた状態で、流水路内の水位に関わらず、横軸ポンプを一定の回転速度で運転することを特徴とするポンプゲートの運転方法。 The pump gate operating method according to claim 6,
A method of operating a pump gate characterized by operating a horizontal shaft pump at a constant rotational speed regardless of the water level in the water channel in a state where the water channel is closed by a gate.
JP2019059546A 2019-03-27 2019-03-27 Operation method of suction cover, horizontal shaft pump, pump gate and pump gate Active JP7186119B2 (en)

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