JP7032995B2 - Drainage blade - Google Patents

Drainage blade Download PDF

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JP7032995B2
JP7032995B2 JP2018091359A JP2018091359A JP7032995B2 JP 7032995 B2 JP7032995 B2 JP 7032995B2 JP 2018091359 A JP2018091359 A JP 2018091359A JP 2018091359 A JP2018091359 A JP 2018091359A JP 7032995 B2 JP7032995 B2 JP 7032995B2
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disk
shaft
side wall
drainage
prism
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JP2019183604A (en
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蕭裕明
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合利美股▲分▼有限公司
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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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Sink And Installation For Waste Water (AREA)

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 drainage motor, and more particularly to a drainage 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 published in Patent Document 1, the shaft located below the disk is a multi-sided prism. A multi-sided prism has a plurality of planes and a rectangular elongated surface formed by connecting two planes to each other. Support ribs located below the disk are connected to the respective planes and elongated surfaces of the polyhedral prism. Due to the structural features described above, the multi-sided prism can generate swirls by a plurality of planes to improve the water repellent effect and drainage efficiency, and the plurality of elongated surfaces can suppress air bubbles 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。 Patent Document 1 can generate a spiral by improving the structure, but the drainage efficiency of the drainage motor is limited because it cannot generate a water flow approaching the disk from the bottom to the top. 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 TWI600862 Gazette

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 has the convenience of guiding water through the concave disk and draining it from the drain by repelling the water upward to generate a water flow that approaches the concave disk from the bottom to the top. The main purpose is to provide drainage blades that can effectively improve the drainage efficiency of the 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 capable of effectively reducing 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-mentioned problems, the drainage blade is provided with 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 by extending upward from the peripheral edge of the disk. The shaft penetrates the disc while maintaining a certain distance from the disc, and is divided into an upper shaft and a lower shaft. The upper part of the shaft is located above the disk and has support ribs that are connected to the drive shaft and extend outward along a plurality of radial directions. Since the plurality of support ribs are connected to the concave disk body, the bottom portion is connected to the disk, 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. Will be done. Its features are as follows. The lower part of the shaft is a multi-sided prism located below the disk. The polyhedral prism has a plurality of side wall surfaces and a bottom surface corresponding to the cross section of the polyhedral prism. The plurality of side wall surfaces are connected to the side portions of the bottom surface, and have elongated square surfaces formed by connecting two adjacent edge portions to each other. The multi-sided prism is twisted from the bottom surface to a certain angle with respect to the disk, and multiple side wall surfaces and multiple square surfaces are tilted so that the twisting direction from the bottom surface matches the turning direction due to 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-mentioned characteristics, the drainage blade according to the present invention guides water through the concave disk body by repelling water upward to generate a water flow approaching the disk from the bottom to the top, and drains the water from the drain port. For convenience, the drainage efficiency of the drainage motor can be effectively improved.

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-mentioned 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。It is a front side perspective view which shows the drainage vane by 1st Embodiment of this 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。It is a back side perspective view which shows the drainage vane by 1st Embodiment of this invention. 図１中の３－３線に沿った断面図である。It is sectional drawing which follows the 3-3 line in FIG. 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。It is sectional drawing which shows the state which the drainage vane by 1st Embodiment of this 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 which shows the drainage vane by 2nd Embodiment of this 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, the 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 is composed of a concave disk 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 so as to extend 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 23 and a lower shaft 25. The shaft upper portion 23 is located above the disk 13 and has a support rib 27 that is connected to the drive shaft 100 and extends outward along a plurality of radial directions. Since the plurality of support ribs 27 are connected to the concave disk body 11, the bottom portion is connected to the disk 13, and the outer end portion is connected to the annular wall surface 15, the shaft upper portion 23 is connected between the plurality of support ribs 27 and the disk 13. Is formed with a plurality of flow paths 17.
The lower shaft 25 is located below the disk 13 and is formed from the polyhedral prism 26. In the present embodiment, the polygonal prism 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 prism 16. The three side wall surfaces 261 are connected to each side of the bottom surface 263, and have an elongated square surface 265 formed by connecting two adjacent side edges to each other. Each square surface 265 corresponds to a support rib 27 having one tip.
Since the polyhedron pillar 26 is twisted with respect to the disk 13 from the bottom surface 263 to a certain angle and inclines the respective side wall surfaces 261 and the square surface 265, each side wall surface 261 becomes a curved surface and each corner. The surface 265 is inclined and curved so as to be elongated. In the multi-sided prism 26, the twisting direction from the bottom surface 263 coincides with the turning direction due to the driving force of the driving shaft 100. The degree of twisting from the bottom surface 263 of the polygonal prism 26 is maintained within a range in which the end portion of the square surface 265 does not exceed the temporary vertical line L1 perpendicular to the tip end portion of another square surface 265. The side wall surface 261 is formed on an inclined curved surface. The corner surface 265 is formed in an elongated and elongated shape that is inclined and curved.
According to the above-mentioned technical features, when the drainage blade 10 and the drive shaft 100 according to the first embodiment of the present invention are connected and used, water is repelled upward to generate a water flow approaching the concave disk body 11 from the lower side to the upper side. By doing so, water can be guided through the concave disk body 11 to be convenient when drained from the drain port 98, the drainage efficiency of the drainage motor can be effectively improved, and 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 repel water upwards, it can be applied to another embodiment of the present invention. The polyhedron pillar 26 may be a quadrangular prism, a pentagonal prism, or the like. That is, the polyhedron prism 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 flat surface. The square surface 265 may be an inclined and elongated flat surface.
Due to the structural change described above, water is similarly repelled upward to generate a water flow approaching the concave disk body 11 from the bottom to the top, thereby guiding the water through the concave disk body 11 and discharging the water from the drain port 98. For convenience, the drainage efficiency of the drainage motor can be effectively improved and noise can be reduced. That is, the shapes of the side wall surface 261 and the square surface 265 are not limited to the above-described embodiment. On the other hand, the front end of the square surface 265 does not always correspond to one support rib 27, and a part of the square surface 265 may correspond to one support rib 27 or the entire corner surface 265 may be arranged so as not to correspond 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 repels water upward to generate a water flow approaching the concave disk body 11 from the bottom to the top, thereby causing water to flow through the concave disk body 11. It is possible to effectively improve the drainage efficiency of the drainage motor by guiding and measuring the convenience when 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 a description of the structure of the first embodiment of the present invention. Subsequently, the operating state of the first embodiment will be described.

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 mounted on the water collecting tank 99 of the drainage motor, the tip of the shaft 21 is connected to the drive shaft 100 and the twisting direction from the bottom 263 is driven. It coincides with the rotation direction due to the driving force of the shaft 100. The plurality of side wall surfaces 261 have an elongated square surface 265 formed by connecting two adjacent edge portions to each other. Each side wall surface 261 is an inclined curved surface. Each corner surface 265 is slanted and curved and elongated.
As shown in FIG. 4, when the drive shaft 100 is rotated by the driving force, the plurality of side wall surfaces 261 and the square surface 265 promote the flow of water (indicated by arrows) in the water collecting tank 99. The water in the water collecting 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. Due to the structure of the plurality of side wall surfaces 261 and the square surface 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, in the first embodiment of the present invention, the concave disk body is formed by repelling water upward to generate a water flow approaching the concave disk body from the lower side to the upper side by the structure of a plurality of side wall surfaces and square surfaces. It is possible to guide water through the drainage port, improve the convenience of draining the water from the drainage port, and effectively improve the drainage efficiency of the drainage motor.

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 due to the structure of the side wall surface and the corner 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 the drainage blade 10'according to the second embodiment of the present invention. The 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 cover the square surface 265'and have an arc portion 291'formed at the end. The arc portion 291'of each convex rib 29'is connected to each corner portion 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 of the second embodiment and the achieved effects are almost the same as those of the first embodiment, the description thereof will be 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 Ring wall
17 Channel
21 shaft
23 Axis upper part
25, 25'Lower shaft
26 Polyhedral prism
261 Side wall surface 263, 263'Bottom surface
265, 265'Square
27 Support rib
29'Convex rib
291'Arc part
98 drain
99 aquarium
100 drive shaft
L1 hypothesis vertical line

Claims (5)

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、
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細長い角面を有し、
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り、
前記多辺形柱体は、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。 Equipped with a concave disk body and shaft,
The concave disk body has a disk and an annular wall surface, and the annular wall surface is formed so as to extend upward from the peripheral edge portion of the disk.
The shaft penetrates the disk while maintaining a certain distance from the disk and is divided into an upper shaft and a lower shaft. The upper shaft is located above the disk, is connected to a drive shaft, and has a plurality of radial directions. The support ribs extend outward along the above, and the plurality of support ribs are connected to the concave disk body, the bottom portion is connected to the disk, 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 polyhedron prism located below the disk.
The polyhedral prism is twisted with respect to the disk from the bottom surface to a certain angle.
The polyhedral prism has a plurality of side wall surfaces and a bottom surface corresponding to a cross section of the polyhedral prism.
The plurality of side wall surfaces are connected to the side portion of the bottom surface, and two adjacent edge portions are connected to each other to have an elongated square surface.
The side wall surface is a curved surface, and the corner surface is curved and elongated.
The polyhedron pillar is characterized in that a plurality of the side wall surfaces and the plurality of the square surfaces are inclined so that the twisting direction from the bottom surface coincides with the turning direction due to the driving force of the driving shaft.
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 the corner surface corresponds to the support rib having one tip portion. 前記多辺形柱体は三つの側壁面を有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 the polyhedral prism has three side wall surfaces. 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 polyhedicular prism is characterized in that the end portion of the square surface is maintained within a range not exceeding a temporary vertical line perpendicular to the tip end portion of another square surface. Item 1. The drainage blade according to Item 1. 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 cover the square surface and have an arc portion formed at an end portion, and the arc portion of each of the convex ribs. The drainage blade according to claim 1, wherein the portions are connected to the respective corner portions of the bottom surface of the polyhedron pillar.
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