JP2019183604A - Drainage vane - Google Patents

Drainage vane Download PDF

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JP2019183604A
JP2019183604A JP2018091359A JP2018091359A JP2019183604A JP 2019183604 A JP2019183604 A JP 2019183604A JP 2018091359 A JP2018091359 A JP 2018091359A JP 2018091359 A JP2018091359 A JP 2018091359A JP 2019183604 A JP2019183604 A JP 2019183604A
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polygonal column
shaft
disk
disc
drainage
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JP7032995B2 (en
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蕭裕明
Yu-Ming Hsiao
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Holimay Corp
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Holimay Corp
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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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps

Abstract

To provide a drainage vane that can effectively improve the drainage efficiency of a drainage motor.SOLUTION: A drainage vane 10 includes a concave disc body 11 and a shaft. The concave disc body has a disc 13 and a ring-shaped wall surface 15. The shaft extends through the disc with a certain distance from the disc, and divided into an upper shaft part and a lower shaft part 25. The upper shaft part is disposed above the disc and has plural supporting ribs 27 extending outwardly along a radial direction. The plural supporting ribs are coupled to the concave disc body. The lower shaft part is a polygonal column body disposed below the disc. The polygonal column body has plural side wall surfaces 261 and a bottom surface 263 corresponding to a cross section of the polygonal column body. The plural side wall surfaces have elongated corner surfaces 265 each formed by combining two adjacent edges with each other. The polygonal column body is twisted from the bottom surface at a certain angle with respect to the disc, slanting the plural side wall surfaces and the plural corner surfaces.SELECTED DRAWING: Figure 2

Description

本発明は、排水モーターに関し、詳しくは排水羽根に関するものである。   The present invention relates to a drain motor, and more particularly to a drain blade.

特許文献１により掲示された排水羽根において、円盤の下方に位置するシャフトは多辺形の柱体である。多辺形の柱体は複数の平面と、複数の平面が二つずつ相互に連結されて形成した角形の細長い面とを有する。円盤の下方に位置する支持リブは多辺形の柱体のそれぞれの平面および細長い面に連結される。上述した構造特徴により、多辺形の柱体は複数の平面によって渦巻きを生成し、撥水効果および排水効率を向上させ、複数の細長い面によって気泡を抑制し、騒音を低減することができる。   In the drainage blades posted by Patent Document 1, the shaft located below the disk is a polygonal column. The polygonal column has a plurality of planes and a rectangular elongated surface formed by connecting a plurality of planes to each other. Support ribs located below the disk are connected to the respective flat and elongated surfaces of the polygonal column. Due to the structural features described above, the polygonal column can generate spirals by a plurality of planes, improve the water repellent effect and drainage efficiency, suppress bubbles by the plurality of elongated surfaces, and reduce noise.

特許文献１は構造を改良することによって渦巻きを生成できるが、下方から上方の円盤に接近する水流を生成できないため、排水モーターの排水効率は限定される。従って、上述した排水モーターの排水効率には改善の余地がある。   Although patent document 1 can produce | generate a spiral by improving a structure, since the water flow which approaches the upper disk from the downward direction cannot be produced | generated, the drainage efficiency of a drainage motor is limited. Therefore, there is room for improvement in the drainage efficiency of the drainage motor described above.

台湾特許ＴＷＩ６００８６２号公報Taiwan Patent TWI600822

本発明は、水を上に弾いて下方から上方の凹状円盤体に接近する水流を生成することによって、凹状円盤体を介して水を誘導して排水口から排出する際の利便性をはかり、排水モーターの排水効率を効果的に向上させることができる排水羽根を提供することを主な目的とする。   The present invention measures the convenience when the water is guided through the concave disk body and discharged from the drain outlet by generating water flow that repels water upward and approaches the upper concave disk body from below, The main purpose is to provide a drainage blade that can effectively improve drainage efficiency of a drainage motor.

本発明は、騒音を効果的に低減できる排水羽根を提供することをもう一つの目的とする。   Another object of the present invention is to provide a drainage blade that can effectively reduce noise.

上述した課題を解決するため、排水羽根は凹状円盤体およびシャフトを備える。凹状円盤体は円盤および環状壁面を有する。環状壁面は円盤の周縁部から上に伸びて形成される。シャフトは円盤と一定距離を保ちながら円盤を貫通し、軸上部および軸下部に分けられる。軸上部は円盤の上方に位置し、駆動軸に連結され、かつ複数の径方向に沿って外側へ伸びていく支持リブを有する。複数の支持リブは凹状円盤体に連結され、底部が円盤に連結され、外側端部が環状壁面に連結されるため、軸上部、複数の支持リブおよび円盤の間には複数の流路が形成される。その特徴は次の通りである。軸下部は円盤の下方に位置する多辺形柱体である。多辺形柱体は複数の側壁面と、多辺形柱体の断面に対応する底面とを有する。複数の側壁面は底面の辺部に連結され、二つずつ隣り合う辺縁部が相互に連結されて形成した細長い角面を有する。多辺形柱体は円盤に対して底面から一定角度に至るまで捻じれ、複数の側壁面および複数の角面を傾斜させ、底面からの捩れ方向を駆動軸の駆動力による旋転方向と一致させる。   In order to solve the above-described problem, the drainage blade includes a concave disk body and a shaft. The concave disk body has a disk and an annular wall surface. The annular wall surface is formed extending upward from the peripheral edge of the disk. The shaft passes through the disk while maintaining a certain distance from the disk, and is divided into an upper part and a lower part of the shaft. The upper part of the shaft is located above the disk, has a support rib connected to the drive shaft and extending outward along a plurality of radial directions. The plurality of support ribs are connected to the concave disk body, the bottom is connected to the disk, and the outer end is connected to the annular wall surface, so that a plurality of flow paths are formed between the upper part of the shaft, the plurality of support ribs, and the disk. Is done. Its features are as follows. The lower part of the shaft is a polygonal column located below the disk. The polygonal column has a plurality of side wall surfaces and a bottom surface corresponding to the cross section of the polygonal column. The plurality of side wall surfaces are connected to side portions of the bottom surface, and have two elongated corner surfaces formed by connecting two adjacent edge portions to each other. The polygonal column is twisted from the bottom surface to a certain angle with respect to the disk, and the side wall surfaces and the plurality of square surfaces are inclined so that the twist direction from the bottom surface coincides with the rotation direction by the driving force of the drive shaft. .

上述した特徴により、本発明による排水羽根は水を上に弾いて下方から上方の円盤に接近する水流を生成することによって、凹状円盤体を介して水を誘導し、排水口から排出する際の利便性をはかり、排水モーターの排水効率を効果的に向上させることができる。   Due to the above-described features, the drainage blade according to the present invention induces water through the concave disk body and discharges it from the drain outlet by generating water flow that repels water upward and approaches the upper disk from below. Convenience can be measured and the drainage efficiency of the drainage motor can be improved effectively.

上述した特徴により、本発明による排水羽根は騒音を効果的に低減できる。   Due to the above-described features, the drainage blade according to the present invention can effectively reduce noise.

本発明の第1実施形態による排水羽根を示す正面側斜視図である。1 is a front perspective view showing a drainage blade according to a first embodiment of the present invention. 本発明の第1実施形態による排水羽根を示す背面側斜視図である。1 is a rear perspective view showing a drainage blade according to a first embodiment of the present invention. 図１中の３−３線に沿った断面図である。FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 1. 本発明の第1実施形態による排水羽根が使用される状態を示す断面図である。FIG. 2 is a cross-sectional view showing a state where the drainage blade according to the first embodiment of the present invention is used. 本発明の第２実施形態による排水羽根を示す背面側斜視図である。It is a back side perspective view showing the drainage blade by a 2nd embodiment of the present invention.

以下、本発明による排水羽根を図面に基づいて説明する。   Hereinafter, a drainage blade according to the present invention will be described with reference to the drawings.

（第１実施形態）
図１から図４に示すように、本発明の第1実施形態による排水羽根１０は凹状円盤体１１およびシャフト２１から構成される。 (First embodiment)
As shown in FIGS. 1 to 4, the drainage blade 10 according to the first embodiment of the present invention includes a concave disc body 11 and a shaft 21.

凹状円盤体１１は、円盤１３および環状壁面１５を有する。環状壁面１５は円盤１３の周縁部から上に伸びて形成される。   The concave disk body 11 has a disk 13 and an annular wall surface 15. The annular wall surface 15 is formed extending upward from the peripheral edge of the disk 13.

シャフト２１は、円盤１３と一定距離を保ちながら円盤１３を貫通し、軸上部２３および軸下部２５に分けられる。軸上部２３は円盤１３の上方に位置し、駆動軸１００に連結され、かつ複数の径方向に沿って外側へ伸びていく支持リブ２７を有する。複数の支持リブ２７は凹状円盤体１１に連結され、底部が円盤１３に連結され、外側端部が環状壁面１５に連結されるため、軸上部２３、複数の支持リブ２７および円盤１３の間には複数の流路１７が形成される。
軸下部２５は円盤１３の下方に位置し、多辺形柱体２６から形成される。本実施形態において、多辺形柱体２６は三角柱であり、三つの側壁面２６１と、多辺形柱体１６の断面に対応する底面２６３とを有する。三つの側壁面２６１は底面２６３のそれぞれの辺部に連結され、二つずつ隣り合う辺縁部が相互に連結されて形成した細長い角面２６５を有する。それぞれの角面２６５は先端部が一つの支持リブ２７に対応する。
多辺形柱体２６は円盤１３に対して底面２６３から一定角度に至るまで捻じれ、それぞれの側壁面２６１および角面２６５を傾斜させるため、それぞれの側壁面２６１は曲面になり、それぞれの角面２６５は傾斜かつ彎曲して細長く伸びる形になる。多辺形柱体２６は底面２６３からの捩れ方向が駆動軸１００の駆動力による旋転方向と一致する。多辺形柱体２６の底面２６３から捻じれる程度は角面２６５の末端部が別の角面２６５の先端部に垂直の仮設垂直線Ｌ１を超えない範囲に維持される。側壁面２６１は傾斜した曲面に形成される。角面２６５は傾斜かつ湾曲して細長く伸びる形に形成される。
上述した技術特徴により、本発明の第1実施形態による排水羽根１０と駆動軸１００とを連結し、使用すれば、水を上に弾いて下方から上方の凹状円盤体１１に接近する水流を生成することによって、凹状円盤体１１を介して水を誘導し、排水口９８から排出する際の利便性をはかり、排水モーターの排水効率を効果的に向上させ、騒音を低減することができる。 The shaft 21 penetrates the disk 13 while maintaining a certain distance from the disk 13, and is divided into an upper shaft portion 23 and a lower shaft portion 25. The shaft upper portion 23 is located above the disk 13 and has support ribs 27 connected to the drive shaft 100 and extending outward along a plurality of radial directions. The plurality of support ribs 27 are connected to the concave disk body 11, the bottom part is connected to the disk 13, and the outer end part is connected to the annular wall surface 15, so that the shaft upper part 23, the plurality of support ribs 27, and the disk 13 are interposed. A plurality of flow paths 17 are formed.
The lower shaft portion 25 is located below the disk 13 and is formed from a polygonal column 26. In the present embodiment, the polygonal column 26 is a triangular prism, and has three side wall surfaces 261 and a bottom surface 263 corresponding to the cross section of the polygonal column 16. The three side wall surfaces 261 are connected to the respective side portions of the bottom surface 263 and have elongated rectangular surfaces 265 formed by connecting two adjacent edge portions to each other. Each square surface 265 corresponds to one support rib 27 at the tip.
The polygonal column 26 is twisted with respect to the disk 13 from the bottom surface 263 to a certain angle, and each side wall surface 261 and the square surface 265 are inclined, so that each side wall surface 261 becomes a curved surface, and each corner The surface 265 is inclined and bent so as to be elongated. In the polygonal column 26, the twisting direction from the bottom surface 263 coincides with the direction of rotation by the driving force of the driving shaft 100. The degree of twisting from the bottom surface 263 of the polygonal column 26 is maintained in a range in which the end portion of the square surface 265 does not exceed the temporary vertical line L1 perpendicular to the tip portion of another square surface 265. The side wall surface 261 is formed in an inclined curved surface. The square surface 265 is inclined and curved and is formed in an elongated shape.
Due to the technical features described above, when the drainage blade 10 and the drive shaft 100 according to the first embodiment of the present invention are connected and used, a water flow is generated by repelling water upward and approaching the concave disk body 11 from above. By doing so, the convenience at the time of guiding water through the concave disk body 11 and discharging it from the drainage port 98 can be measured, the drainage efficiency of the drainage motor can be effectively improved, and the noise can be reduced.

別の実施形態において、側壁面２６１および角面２６５が水を上に弾くことさえできれば、本発明の別の実施形態に適用できる。多辺形柱体２６は四角柱、五角柱などになってもよい。つまり、多辺形柱体２６は上述した実施形態に限定されず、形だけが変化するため、図面に表示されない。側壁面２６１は傾斜した平面になってもよい。角面２６５は傾斜して細長く伸びる平面になってもよい。
上述した構造変化により、同様に水を上に弾いて下方から上方の凹状円盤体１１に接近する水流を生成することによって、凹状円盤体１１を介して水を誘導し、排水口９８から排出する際の利便性をはかり、排水モーターの排水効率を効果的に向上させ、騒音を低減することができる。つまり、側壁面２６１および角面２６５の形は上述した実施形態に限定されない。一方、角面２６５は必ずしも先端部が一つの支持リブ２７に対応するとは限らず、一部分が一つの支持リブ２７に対応するか、全部が支持リブ２７に対応しないように配置されてもよい。つまり、角面２６５と支持リブ２７との配置関係は上述した実施形態に限定されない。 In another embodiment, as long as the side wall surface 261 and the corner surface 265 can flip water upward, it can be applied to another embodiment of the present invention. The polygonal column 26 may be a quadrangular column, a pentagonal column, or the like. That is, the polygonal column 26 is not limited to the above-described embodiment, and only the shape changes, so that it is not displayed in the drawing. The side wall surface 261 may be an inclined plane. The square surface 265 may be a flat surface that is inclined and elongated.
Due to the structural change described above, water is similarly generated by repelling water upward and approaching the concave disk body 11 from above to guide the water through the concave disk body 11 and discharge it from the drain port 98. It is possible to improve the drainage efficiency of the drainage motor and reduce the noise. That is, the shape of the side wall surface 261 and the square surface 265 is not limited to the embodiment described above. On the other hand, the square surface 265 does not necessarily correspond to one support rib 27 at the tip portion, and may be arranged so that a part thereof corresponds to one support rib 27 or not all corresponds to the support rib 27. That is, the arrangement relationship between the square surface 265 and the support rib 27 is not limited to the above-described embodiment.

上述したとおり、本発明の第1実施形態による排水羽根１０は、水を上に弾いて下方から上方の凹状円盤体１１に接近する水流を生成することによって、凹状円盤体１１を介して水を誘導し、排水口９８から排出する際の利便性をはかり、排水モーターの排水効率を効果的に向上させることができる。   As described above, the drainage blade 10 according to the first embodiment of the present invention generates water flow from the lower side toward the upper concave disk body 11 by repelling water, thereby allowing water to flow through the concave disk body 11. It is possible to improve the drainage efficiency of the drainage motor by guiding the convenience and draining from the drainage port 98.

上述したとおり、本発明の第1実施形態による排水羽根１０は騒音を低減する効果を果たすことができる。   As described above, the drainage blade 10 according to the first embodiment of the present invention can achieve the effect of reducing noise.

以上は本発明の第1実施形態の構造についての説明である。続いて、第1実施形態の作動状態について説明を進める。   The above is the description of the structure of the first embodiment of the present invention. Subsequently, description will be given on the operating state of the first embodiment.

図２から図４に示すように、本発明による排水羽根１０が排水モーターの集水槽９９に装着される際、シャフト２１は先端部が駆動軸１００に連結され、底部２６３からの捩れ方向が駆動軸１００の駆動力による旋転方向と一致する。複数の側壁面２６１は二つずつ隣り合う辺縁部が相互に連結されて形成した細長い角面２６５を有する。それぞれの側壁面２６１は傾斜した曲面である。それぞれの角面２６５は傾斜かつ彎曲して細長く伸びる形である。
駆動軸１００が駆動力によって回転する際、図４に示すように、複数の側壁面２６１および角面２６５は集水槽９９内の水（矢印表示）の流動を促す。集水槽９９内の水は複数の側壁面２６１および角面２６５に沿って上へ流動し、複数の流路１７を通過し、排水口９８から流出する。上述した複数の側壁面２６１および角面２６５の構造により、撥水する際に生じた水の抵抗を低下させ、気泡発生を抑制し、騒音を低減する効果を果たすことができる。 As shown in FIGS. 2 to 4, when the drainage blade 10 according to the present invention is installed in the water collection tank 99 of the drainage motor, the tip of the shaft 21 is connected to the drive shaft 100, and the twist direction from the bottom 263 is driven. This coincides with the direction of rotation by the driving force of the shaft 100. The plurality of side wall surfaces 261 have elongated rectangular surfaces 265 formed by connecting two adjacent edge portions to each other. Each side wall surface 261 is an inclined curved surface. Each square surface 265 is slanted, bent and elongated.
When the drive shaft 100 is rotated by the drive force, the plurality of side wall surfaces 261 and the square surfaces 265 promote the flow of water (indicated by arrows) in the water collection tank 99 as shown in FIG. The water in the water collection tank 99 flows upward along the plurality of side wall surfaces 261 and the square surface 265, passes through the plurality of flow paths 17, and flows out from the drain port 98. With the structure of the plurality of side wall surfaces 261 and the square surfaces 265 described above, it is possible to reduce the resistance of water generated when water is repelled, suppress the generation of bubbles, and reduce noise.

上述したとおり、本発明の第１実施形態は複数の側壁面および角面の構造により、水を上に弾いて下方から上方の凹状円盤体に接近する水流を生成することによって、凹状円盤体を介して水を誘導し、排水口から排出する際の利便性をはかり、排水モーターの排水効率を効果的に向上させることができる。   As described above, the first embodiment of the present invention has a plurality of side wall surfaces and a square surface structure to generate a water flow that repels water upward and approaches a concave disk body on the upper side from below. Therefore, it is possible to improve the drainage efficiency of the drainage motor by inducing the convenience of discharging the water through the drainage port.

上述したとおり、本発明は側壁面および角面の構造により、騒音を低減する効果を果たすことができる。   As described above, the present invention can achieve the effect of reducing noise by the structure of the side wall surface and the square surface.

（第２実施形態）
図５に示したのは本発明の第２実施形態による排水羽根１０’である。第１実施形態との違いは下記のとおりである。 (Second Embodiment)
FIG. 5 shows a drainage blade 10 ′ according to a second embodiment of the present invention. Differences from the first embodiment are as follows.

第２実施形態において、軸下部２５’は複数の凸状リブ２９’を有する。複数の凸状リブ２９’は完全に角面２６５’に被さり、末端部に形成された円弧部２９１’を有する。それぞれの凸状リブ２９’の円弧部２９１’は底面２６３’のそれぞれの角部に連結される。   In the second embodiment, the lower shaft portion 25 ′ has a plurality of convex ribs 29 ′. The plurality of convex ribs 29 'completely covers the square surface 265' and has an arc portion 291 'formed at the end portion. Arc portions 291 'of the respective convex ribs 29' are connected to the respective corners of the bottom surface 263 '.

第２実施形態の構造および達成した効果は第１実施形態とほぼ同じであるため、説明を省略する。   Since the structure and achieved effect of the second embodiment are substantially the same as those of the first embodiment, description thereof is omitted.

１０、１０’ 排水羽根
１１ 凹状円盤体
１３ 円盤
１５ 環状壁面
１７ 流路
２１ シャフト
２３ 軸上部
２５、２５’ 軸下部
２６ 多辺形柱体
２６１ 側壁面
２６３、２６３’ 底面
２６５、２６５’ 角面
２７ 支持リブ
２９’ 凸状リブ
２９１’ 円弧部
９８ 排水口
９９ 水槽
１００ 駆動軸
Ｌ１ 仮説垂直線 10, 10 'drainage blade
11 Concave disk body 13 Disk
15 Annular wall
17 Flow path
21 Shaft
23 Axis top
25, 25 'lower shaft
26 Polygonal column
261 Side wall surface 263, 263 ′ bottom surface
265, 265 'corner
27 Support rib
29 'Convex rib
291 'Arc part
98 Drainage port
99 aquarium
100 Drive shaft
L1 hypothetical vertical line

Claims (6)

凹状円盤体およびシャフトを備え、
前記凹状円盤体は、円盤および環状壁面を有し、前記環状壁面は前記円盤の周縁部から上に伸びて形成され、
前記シャフトは、前記円盤と一定距離を保ちながら前記円盤を貫通し、軸上部および軸下部に分けられ、前記軸上部は前記円盤の上方に位置し、駆動軸に連結され、かつ複数の径方向に沿って外側へ伸びていく支持リブを有し、複数の前記支持リブは前記凹状円盤体に連結され、底部が前記円盤に連結され、外側端部が前記環状壁面に連結されるため、前記軸上部、複数の前記支持リブおよび前記円盤の間には複数の流路が形成され、
前記軸下部は、円盤の下方に位置する多辺形柱体であり、
前記多辺形柱体は複数の側壁面と、前記多辺形柱体の断面に対応する底面とを有し、
複数の前記側壁面は前記底面の辺部に連結され、二つずつ隣り合う辺縁部が相互に連結されて形成した細長い角面を有し、
前記多辺形柱体は前記円盤に対して前記底面から一定角度に至るまで捻じれ、複数の前記側壁面および複数の前記角面を傾斜させ、前記底面からの捩れ方向を前記駆動軸の駆動力による旋転方向と一致させることを特徴とする、
排水羽根。 With a concave disk and shaft,
The concave disc body has a disc and an annular wall surface, and the annular wall surface is formed to extend upward from a peripheral portion of the disc,
The shaft penetrates the disk while maintaining a certain distance from the disk, and is divided into an upper part and a lower part of the shaft, the upper part of the shaft is located above the disk, connected to the drive shaft, and a plurality of radial directions A plurality of the support ribs are connected to the concave disc body, the bottom portion is connected to the disc, and the outer end portion is connected to the annular wall surface. A plurality of flow paths are formed between the upper part of the shaft, the plurality of support ribs and the disk,
The lower part of the shaft is a polygonal column located below the disk,
The polygonal column has a plurality of side wall surfaces and a bottom surface corresponding to a cross section of the polygonal column,
The plurality of side wall surfaces are connected to the side portions of the bottom surface, and have two elongated corner surfaces formed by connecting two adjacent edge portions to each other.
The polygonal column is twisted with respect to the disk from the bottom surface to reach a certain angle, the plurality of side wall surfaces and the plurality of square surfaces are inclined, and the twist direction from the bottom surface is driven by the drive shaft. It is characterized by matching the turning direction by force,
Drainage blade. 前記角面は先端部が一つの前記支持リブに対応することを特徴とする請求項１に記載の排水羽根。   The drainage blade according to claim 1, wherein a tip portion of the square surface corresponds to the support rib. 前記多辺形柱体は三角柱であることを特徴とする請求項１に記載の排水羽根。   The drain blade according to claim 1, wherein the polygonal column is a triangular column. 前記多辺形柱体の前記底面から捻じれる程度は、前記角面の末端部が別の前記角面の先端部に垂直の仮設垂直線を超えない範囲に維持されることを特徴とする請求項１に記載の排水羽根。   The degree of twisting from the bottom surface of the polygonal column is maintained in a range in which the end portion of the square surface does not exceed a temporary vertical line perpendicular to the tip portion of another square surface. Item 2. The drainage blade according to Item 1. 前記側壁面は曲面であり、前記角面は湾曲して細長く伸びる形であることを特徴とする請求項１に記載の排水羽根。   The drainage blade according to claim 1, wherein the side wall surface is a curved surface, and the square surface is curved and elongated. 前記軸下部は、複数の凸状リブを有し、複数の前記凸状リブは完全に前記角面に被さり、末端部に形成された円弧部を有し、それぞれの前記凸状リブの前記円弧部は前記多辺形柱体の前記底面のそれぞれの角部に連結されることを特徴とする請求項１に記載の排水羽根。   The lower part of the shaft has a plurality of convex ribs, and the plurality of convex ribs completely covers the angular surface and has arc portions formed at the end portions, and the arcs of the respective convex ribs The drainage blade according to claim 1, wherein the portion is connected to each corner portion of the bottom surface of the polygonal column.
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