經濟部智慧財產局員工消費合作社印製 482868 A7 B7 五、發明說明（/ ) <發明背景> 本發明係有關於一種用於提升以垂直轉子將風力轉換 產生電力之效能，特別是有關於對在低風力區域對風力能 量作較佳之利用。 要從風力轉換產生電力，需要使用適當設計的轉子或 轉子輪葉，將流動之流體之運動能量轉換成爲動力能量。 發電機能夠有助於將這轉換成電力能量。 在現有工藝技術水準之中，具有水平式轉軸和垂直式 轉軸的系統已早爲人熟知。 帶有水平轉軸之風力系統通常是被設計用在低紊流之 風流裏，因而必須被安裝距離地面3公尺以上的桅桿上。 假如風速超過每秒1 3公尺的時候，這些系統的轉子必須 被固定住，以避免對該風力系統造成損壞。 在靠近地表平面之水平面上的渦流似乎不會對帶有垂 直轉軸的風力系統造成不利的影響，所以能夠在離地表較 低高度的地方使用這些風力系統。因而，即使在風速超過 每秒1 3公尺的時候：也不需要用來停止轉子動作的安全 開關，但在高風速下此類系統所能產生的電力通常要比胃 可供比較的水平風能系統之最大電力爲低。 U S 5%0 4 4,8 7 8揭示一種用於風能系統的垂直 轉子。該轉子具有兩個徑向轉子基座面，這些基座面、沿著： 軸線方向彼此分隔開一段距離。轉子輪葉在兩轉子基座面 之間延伸，其方位平行於該轉子的軸線。這些轉子輪葉沿 著平行於轉子軸線方向分成數個區段，並且具有平;行於該 3 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公爱） (請先閱讀背面之注意事項再填寫本頁) 訂---------線 經濟部智慧財產局員工消費合作社印製 482868 A7 B7 五、發明說明（2 ) 軸線的葉面，而在兩轉子輪葉之間有些許的彎曲弧度’以 便有利於氣流通過所設置的間隙之間。 用來產生電力的垂直轉子，其主要優點是：即使在風 速是低的時候，仍能夠有高的效率。在低風速下的慢速旋 轉可以讓它們利用風能，而將能量損失維持在很低的程度 。較低的紊流對此類系統的電能特性具有正面的效果。 即使垂直旋轉的風能系統也需要某種最低風速才能幫 助啓動這些垂直轉子。 使用改變設計或延伸垂直轉子並在垂直轉子上添加各 類組件的方式來改良在低風速下之垂直旋轉風能系統的啓 動特性的方法至今尙未被公開。 因而，本發明之任務是要建議一種用來在低風區域裏 較佳地利用風能的垂直轉子之裝置。本發明將有助於降低 用來以簡單方式啓動垂直轉子所需要的最小風速，並且也 能夠減少投資成本。 本發明利用一種具有如申請專利範圍第1項所述之特 徵的裝置來達成上述名任務，其特徵在於：嵌條或慢速風 條會引起在平行於軸線之轉子輪葉之間的自由流(free flow) 斷面緊縮，並且提供空氣流的額外之接觸面。這有助於減 少啓動所需要的表面速度。 申請專利範圍第2項所述之具體實施例使得即使是現 有已安裝妥當的風力系統，也可以低的花費來安裝慢速風 條’而無需花費高的設備費用，這特別是指將該慢速風條 黏貼在轉子輪葉上的方式。 4 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) 訂---------線 482868 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（> ) 如申請專利範圍第3項和第8項所述之具體實施例能 夠達成增加該風力系統性能的效果，特別是在高風速的時 候，這主要是由於本發明之裝置可以放大上浮的力道，並 且實現在高風速下之流動。這有助於減少效率上的損失。 如申請專利範圍第4項所述之具體實施例藉由改善轉 子的流體機械特性來加強該慢速風條對於降低最低啓動速 度的效果。 考慮到風速對流動行爲的影響，利用選擇使用如申請 專利範圍第5項所述之彎角形或圓形的空氣切口具體實施 例，使能夠藉由慢速風條來改變流動面。 如申請專利範圍第6項所述之具體實施例可以減少由 慢速風條引起的空氣阻力。 如申請專利範圍第7項所述之單件式慢速風條提供了 製造和組裝成本上的優點。它也加強了該慢速風條承受機 械應力的穩定性。 將全部的轉子輪葉裝設以慢速風條的選擇性提供了降 低啓動所需的最小表兩速度之機會。 根據本發明申請專利範圍第1 〇項所述之較佳具體實 施例，爲了更進一步地改善風力系統性能之增強，被設置 在軸線半徑/方向內側之多個轉子輪葉其中至少一個必須被 裝設以一個橫跨轉子輪葉和軸桿（或包覆著該軸桿的中央 管）之間的自由空間的慢速風條。 在上述之慢速風條以及該額外之慢速風條上面可以設 置一個開孔或切口，以改善流動行爲。 5 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐)~ - (請先閱讀背面之注意事項再填寫本頁) # 訂： --線_ 經濟部智慧財產局員工消費合作社印製 482868 A7 B7 五、發明說明（0) 最佳化試驗顯示：如申請專利範圍第1 2項所述的這 些轉子輪葉應該具有一個大於9 〇度的角長。較佳的角長 數値爲1，0 5度左右。 特別是以此類轉子輪葉，但亦可以基於本發明之風力 系統之所有其他具體實施例，較早提及之慢速風條可具有 約45%之角長。 將更進一步地配合圖5來解釋「角長」之術語。 較佳的是，半徑方向最外側端的轉子輪葉至少其中之 一個轉子輪葉是裝設有一個空氣折射板’該空氣折射板較 佳地延伸跨越過該轉子輪葉位置所在的轉子基座表面之周 緣邊。較佳地，在每一個半徑方向最外端之轉子輪葉上也 設置有一個空氣折射板。 <隨附圖式之簡單說明> 以下藉助隨附圖式詳細地對本發明作一描述。 圖1爲垂直轉子之徑向界面的平面視圖，該平面視圖 帶有本發明之轉子組合件和該裝置實施例的示意結構。 圖2爲類似圖1之本發明裝置另一具體實施例的平面 視圖。 圖3爲如圖1中所示的A方向觀察的慢速風條之側視 圖。 v 圖4爲如圖2中沿B方向觀察之本發明使用的另一慢 速風條具體實施例的側視圖。 圖5爲本發明裝置的另一較佳具體實施例的平面視圖 〇 6 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) - -線- 482868 Α7 ------ Β7 五、發明說明（r) 〈圖號說明〉 1:轉子基座表面；2:垂直轉子軸桿；3:轉子輪葉； 4:機翼型轉子輪葉；5:慢速風條；6:搖擺的尖點； 7:空氣切口；1〇:轉子基座表面；11:轉子輪葉； 1 2 :慢速風條；1 3 :開孔；1 ·4 :轉子輪葉； 1 5 :轉子輪葉；1 6 :空氣折射板；2 2 :中央管。 <發明之詳細說明> 圖1爲一徑向界面的平面視圖，該徑向界面貫穿一帶 有轉子基座表面1的三角形垂直轉子的斷面。一垂直轉子 軸桿2通過垂直轉子的中心。凹下的轉子輪葉係被排列在 該轉子基座表面1的上面，平行於該軸桿並朝向軸桿彎折 。轉子輪葉3的起始點和終止點描繪出一個四分之一圓弧 ’而其中一端點指向風的方向，而另一端點則係沿著軸線 的方向。轉子輪葉3的外形輪廓就像是一個沿軸向彎折的 葉片一樣。一個帶有兩個沿著轉子軸線2之方向不同長度 之柄部的慢速風條5被設置在轉子輪葉3上面，沿半徑方 向位於靠近轉子基座奉面1的外緣。該慢速風條5在半徑 方向上具有一個折角輪廓，並且慢速風條5的短柄部係被 固定在該轉子輪葉3上。該慢速風條5是與軸線方向平行 的。慢速風;條5的長柄部站立在該轉子輪葉3的表面上。 圓形或尖角形的空氣切口 7是設置在該彎角之慢速風條5 的彎曲部內。 圖2爲通過一圓形垂直轉子的徑向界面之平面視圖。 圖示的該圓形垂直轉子帶有已有部份省略掉的轉子基座表 7 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) » Γ 經濟部智慧財產局員工消費合作社印製 482868 經濟部智慧財產局員工消費合作社印製 A7 ______B7 '~ ~ ~~' -------- 五、發明說明（心） 面1 0。一垂直轉子軸桿2穿過該垂直轉子的中心。凹下 的機翼型轉子輪葉4被安裝在轉子上面，該轉子輪葉4的 弓折方向係平行於該轉子軸桿2。轉子輪葉4的起始點和 終止點描繪一個圓弧，其中，一端係指向風的方向，而另 一端則係指向軸線的方向。〜個慢速風條5被置於轉子基 座表面1 0的外側，平行於該轉子輪葉4。慢速風條5由 兩個軸向平行的轉子輪葉組成，該轉子輪葉朝向軸線的方 向凹下，並且與軸線呈不同角度的圓弧形彎曲，這便形成 —個搖擺的尖點6。該尖點6具有呈彎角形狀或圓形的空 氣切口 7。 圖3是一個帶有長方形或圓形空氣切口 7的慢速風條 5之側視圖。 圖4是一個如圖2所示帶有長方形或圓形空氣切口 7 的慢速風條5具體實施例的側面視圖。 在操作中，氣流被引導到位在轉子基座表面丨或丄〇 上面的轉子輪葉3或4，而馬達因而藉此順著風向被轉動 。風能夠穿過所設置昀空氣切口 7而流過慢速風條4或5 的彎折地帶。 本發明所建議使用的慢速風條5改進了轉子的啓動和 旋轉運動以及在低風速時的風能之利用。這使得與不設置 慢速風條之垂直旋轉系統相較，它整年所生產的電力增加 許多。 一個主要的設計優點也在於：本發明所設置在慢速風 條5之彎角或彎折地帶的空氣切口 7使得在這個地帶能夠 8 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) -# 訂： •線· 482868 A7 B7 五、發明說明（7) 有空氣流，並且藉此確保在高風速的時候有特別高的上升 傾向。結果是可以減少效率上的損失。 (請先閱讀背面之注意事項再填寫本頁) 在與水平風能系統相比較的時候，在平均每年風速低 於每秒1 0公尺的地區，由於使用帶有慢速風條的垂直轉 子可以得到一個明顯增強的性能。· 本發明之裝置的另一個優點是：只需要較少的投資， 並且能夠對現存的垂直旋轉風能系統可以作經濟有效的改 裝。因此，慢速風條能夠被黏接到傳統轉子輪葉3的內側 邊，譬如像是如圖3所示一般。 經濟部智慧財產局員工消費合作社印製 圖5顯示本發明垂直轉子另一個具體實施例的平面視 圖。它的外輪廓大致上是三角形狀並帶有圓形的尖角以及 向內抽引的凹入邊。它設有三組，每組三個轉子輪葉1 1 、1 4和1 5，這些轉子輪葉再一次地是呈圓弧狀凹入並 且與轉子軸線2相平行。這些轉子輪葉1 1 .、1 4和1 5 的角長（angular length)超過9 0度；較佳爲大約1 0 5度 左右；在此處所說的角長是由相關轉子輪葉所張開的個別 角度來界定的，譬如：對轉子輪葉1 4而言，角長是由角 度^界定。慢速風條5由轉子輪葉沿著半徑方向向內伸展 ’並且是被置於一個大約爲4 5度角的位置。到目前爲止 ’圖5的具體實施例在功能上大抵都和圖1和圖2所顯示 的一樣。但是，此處設置有另一個額外的慢速風條1 2。 基本上，所有的轉子輪葉組都能夠各自設置一個的此類的 慢速風條。該慢速風條1 2具有如下的特色：它橫跨在半 徑方向上最內側的轉子輪葉1 1的內側端和中央管2 2之 9 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 482868 A7 _B7 五、發明說明（《） 間的自由空間，該中央管2 2的中心線即是軸線2。該慢 速風條1 2如同慢速風條5—樣，具有一個或多個開孔或 切口。每一個徑向最外側的轉子輪葉1 5也設有一個空氣 折射板1 6，該折射板延伸超過轉子基板1 0的外輪廓線 〇 在本技術說明、附圖和申請專利範圍所描述的特徵， 它們各自單獨和任意的組合都是本發明實施的重要部份。 (請先閱讀背面之注意事項再填寫本頁) 參 訂： —線· 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐）Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 482868 A7 B7 V. Description of the Invention (/) < Background of the Invention > The present invention relates to a method for improving the efficiency of converting electric power from wind power by a vertical rotor, and particularly about Make better use of wind energy in low wind areas. To generate electricity from wind power conversion, a properly designed rotor or rotor blades are required to convert the kinetic energy of the flowing fluid into kinetic energy. A generator can help convert this into electrical energy. In the state of the art, systems with horizontal and vertical shafts have long been known. Wind systems with horizontal shafts are usually designed for use in low turbulent wind currents and must therefore be installed on masts more than 3 meters above the ground. If the wind speed exceeds 13 meters per second, the rotor of these systems must be fixed to avoid damage to the wind system. Eddy currents on a horizontal plane near the surface level do not seem to adversely affect wind systems with vertical axis of rotation, so these wind systems can be used at low altitudes from the surface. Therefore, even when the wind speed exceeds 13 meters per second: there is no need to use a safety switch to stop the rotor, but at high wind speeds, such systems usually generate more power than the horizontal wind that can be compared with the stomach. The maximum power of the energy system is low. U S 5% 0 4 4, 8 7 8 discloses a vertical rotor for wind energy systems. The rotor has two radial rotor base faces, which are spaced apart from one another along the axis direction. The rotor blades extend between the two rotor base faces, and their orientation is parallel to the axis of the rotor. These rotor blades are divided into several sections along the direction parallel to the axis of the rotor and are flat; the three paper sizes are applicable to the Chinese National Standard (CNS) A4 (210 X 297 public love) (please read the Note: Please fill in this page again) Order --------- Printed by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 482868 A7 B7 V. Description of the invention (2) The axis of the blade, and the two rotor blades There is a slight curvature of the arc 'in order to facilitate the flow of air between the set gaps. The main advantage of a vertical rotor used to generate electricity is that it has high efficiency even when the wind speed is low. Slow rotation at low wind speeds allows them to use wind energy while maintaining energy losses to a very low level. Lower turbulence has a positive effect on the electrical characteristics of such systems. Even vertically rotating wind energy systems require some minimum wind speed to help start these vertical rotors. The method of improving the starting characteristics of a vertical rotating wind energy system at a low wind speed by changing the design or extending the vertical rotor and adding various components to the vertical rotor has not been disclosed so far. Therefore, the object of the present invention is to propose a device for vertical rotors which makes better use of wind energy in low wind regions. The present invention will help reduce the minimum wind speed required to start the vertical rotor in a simple manner and also reduce investment costs. The present invention uses a device having the characteristics described in item 1 of the scope of the patent application to achieve the above-mentioned task, which is characterized in that the molding or slow wind strip will cause a free flow between rotor blades parallel to the axis (free flow) The cross-section is tight and provides additional contact surface for air flow. This helps reduce the surface speed required for startup. The specific embodiment described in item 2 of the scope of patent application makes it possible to install a slow wind bar at a low cost, even if it is an existing installed wind system, without requiring high equipment costs, especially referring to the slow The way the speed wind sticks to the rotor blades. 4 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page) Order --------- line 482868 A7 B7 Ministry of Economy Wisdom Printed by the Consumer Cooperative of the Property Bureau V. Invention Description (>) The specific embodiments described in item 3 and item 8 of the scope of patent application can achieve the effect of increasing the performance of the wind system, especially at high wind speeds, This is mainly because the device of the present invention can amplify the upward force and achieve flow at high wind speeds. This helps reduce losses in efficiency. The specific embodiment described in item 4 of the patent application scope enhances the effect of the slow wind bar on reducing the minimum starting speed by improving the fluid mechanical properties of the rotor. Considering the influence of wind speed on the flow behavior, a specific embodiment using a curved or circular air cut as described in item 5 of the scope of the patent application is selected to enable the flow surface to be changed by a slow wind bar. The specific embodiment described in item 6 of the scope of patent application can reduce the air resistance caused by the slow wind bar. The one-piece slow wind strip as described in item 7 of the patent application scope provides advantages in terms of manufacturing and assembly costs. It also enhances the stability of the slow wind bar against mechanical stress. The option of installing all the rotor blades with a slow wind bar provides the opportunity to reduce the minimum table speed required for start-up. According to the preferred embodiment described in item 10 of the scope of patent application of the present invention, in order to further improve the performance of the wind power system, at least one of the plurality of rotor blades disposed on the inner side of the axis radius / direction must be installed. A slow wind bar is provided that spans the free space between the rotor blades and the shaft (or the central tube covering the shaft). An opening or cut may be provided on the above-mentioned slow wind strip and the additional slow wind strip to improve the flow behavior. 5 This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ~-(Please read the precautions on the back before filling this page) # Order: --line_ Consumer Cooperatives, Intellectual Property Bureau, Ministry of Economic Affairs Printed 482868 A7 B7 V. Description of the invention (0) The optimization test shows that the rotor blades described in item 12 of the patent application scope should have an angular length greater than 90 degrees. The preferred angle length 値 is about 1.05 degrees. This type of rotor blade is particularly, but can also be based on all other specific embodiments of the wind power system of the present invention. The slow wind bar mentioned earlier may have an angular length of about 45%. The term "corner length" will be explained further in conjunction with FIG. 5. Preferably, at least one of the rotor blades at the outermost end in the radial direction is provided with an air refraction plate. The air refraction plate preferably extends across the surface of the rotor base where the rotor blade is located The perimeter edge. Preferably, an air refraction plate is also provided on each outermost rotor blade in the radial direction. < Brief description of accompanying drawings > The present invention is described in detail below with reference to the accompanying drawings. Fig. 1 is a plan view of a radial interface of a vertical rotor with a schematic structure of a rotor assembly of the present invention and an embodiment of the device. Fig. 2 is a plan view of another embodiment of the device similar to that of Fig. 1; Fig. 3 is a side view of the slow wind bar as viewed in the direction A shown in Fig. 1. v FIG. 4 is a side view of another specific embodiment of the slow wind bar used in the present invention as viewed in the direction of B in FIG. 2. Figure 5 is a plan view of another preferred embodiment of the device of the present invention. 0 This paper size is applicable to Chinese National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling out this page. )--Line-482868 Α7 ------ Β7 V. Description of the invention (r) <Illustration of drawing number> 1: Rotor base surface; 2: Vertical rotor shaft; 3: Rotor blades; 4: Wing Type rotor blades; 5: slow speed wind strip; 6: swaying sharp point; 7: air cut; 10: rotor base surface; 11: rotor blades; 1 2: slow speed wind strip; 1 3: open 1 · 4: rotor blades; 15: rotor blades; 16: air refraction plate; 22: central tube. < Detailed description of the invention > Fig. 1 is a plan view of a radial interface which penetrates a cross section of a triangular vertical rotor having a rotor base surface 1. A vertical rotor shaft 2 passes through the center of the vertical rotor. The recessed rotor blade system is arranged above the rotor base surface 1, parallel to the shaft and bent toward the shaft. The starting point and the ending point of the rotor blade 3 depict a quarter arc ′, and one of the ends points in the direction of the wind, and the other end points in the direction of the axis. The outer contour of the rotor blade 3 is like a blade bent in the axial direction. A slow wind strip 5 with two shanks having different lengths along the direction of the rotor axis 2 is provided above the rotor blades 3 and is located near the outer edge of the rotor base face 1 in a radial direction. The slow wind strip 5 has a chamfered profile in the radial direction, and the short shank portion of the slow wind strip 5 is fixed to the rotor blade 3. The slow wind bar 5 is parallel to the axial direction. Slow wind; the long handle of the strip 5 stands on the surface of the rotor blade 3. A circular or sharp-angled air cutout 7 is provided in the bent portion of the slow-speed wind strip 5 at the corner. Figure 2 is a plan view of a radial interface through a circular vertical rotor. The circular vertical rotor shown in the figure has a rotor base that has been omitted. Table 7 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back first) (Fill in this page) »Γ Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 482868 Printed by the Employee Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 ______B7 '~~~~' Face 1 0. A vertical rotor shaft 2 passes through the center of the vertical rotor. The recessed wing-type rotor blade 4 is mounted on the rotor, and the bow direction of the rotor blade 4 is parallel to the rotor shaft 2. The starting point and the ending point of the rotor blade 4 describe an arc, in which one end points in the direction of the wind and the other end points in the direction of the axis. One or more slow wind strips 5 are placed outside the rotor base surface 10, parallel to the rotor blades 4. The slow wind strip 5 is composed of two axially parallel rotor blades which are recessed toward the axis and are curved in a circular arc at a different angle from the axis. This forms a swaying point 6 . The sharp point 6 has an air cut 7 having a curved shape or a circular shape. Figure 3 is a side view of a slow wind bar 5 with rectangular or circular air cuts 7. Fig. 4 is a side view of a specific embodiment of a slow wind strip 5 with rectangular or circular air cuts 7 as shown in Fig. 2. In operation, the airflow is directed to the rotor blades 3 or 4 above the rotor base surface 丨 or 丄 〇, and the motor is thereby rotated in the direction of the wind. The wind can pass through the provided 昀 air cutouts 7 and flow through the bending area of the slow wind bar 4 or 5. The slow wind bar 5 proposed by the present invention improves the starting and rotating movement of the rotor and the use of wind energy at low wind speeds. This makes it possible to generate much more electricity throughout the year compared to a vertical rotating system without a slow wind bar. A major design advantage is also that the air cut 7 provided by the present invention in the corner of the slow wind strip 5 or in the bending zone enables 8 in this zone. The paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the notes on the back before filling out this page)-# Order: • Line · 482868 A7 B7 V. Description of the invention (7) There is air flow, and to ensure that it is particularly high at high wind speeds Rising tendency. The result is a reduction in efficiency. (Please read the notes on the back before filling in this page) When comparing with horizontal wind energy systems, in areas where the average annual wind speed is less than 10 meters per second, due to the use of vertical rotors with slow wind bars You can get a significantly enhanced performance. · Another advantage of the device of the present invention is that it requires less investment and can be cost-effectively retrofitted to existing vertical rotating wind energy systems. Therefore, the slow wind bar can be adhered to the inner side of the conventional rotor blade 3, for example, as shown in FIG. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs Figure 5 shows a plan view of another embodiment of the vertical rotor of the present invention. Its outer contour is roughly triangular with rounded sharp corners and concave edges drawn inward. It is provided with three sets of three rotor blades 1 1, 1 4 and 15. These rotor blades are once again concave in the shape of an arc and parallel to the rotor axis 2. The angular lengths of these rotor blades 1 1. 1, 14 and 15 are more than 90 degrees; preferably about 105 degrees; the angular length mentioned here is stretched by the relevant rotor blades The individual angles are defined by, for example, the angle of the rotor blade 14 is defined by the angle ^. The slow wind strip 5 is extended inwardly by the rotor blades' and is placed at an angle of about 45 degrees. So far, the embodiment of FIG. 5 is almost the same in function as that shown in FIGS. 1 and 2. However, here is another extra slow wind bar 1 2. Basically, all rotor blade groups can be provided with one such slow wind bar. The slow wind strip 1 2 has the following characteristics: it spans the inner end of the rotor blade 1 1 and the central tube 2 2 9 which are the innermost in the radial direction. The paper size is applicable to China National Standard (CNS) A4 specifications ( 210 X 297 mm) 482868 A7 _B7 V. Free space between the description of the invention ("), the center line of the central tube 22 is the axis 2. Like the slow wind strip 5, the slow wind strip 12 has one or more openings or cutouts. Each radially outermost rotor blade 15 is also provided with an air refraction plate 16 which extends beyond the outer contour of the rotor base plate 10. The description in the scope of this technical description, drawings and patent applications Features, each of them individually and in any combination are important parts of the implementation of the present invention. (Please read the precautions on the back before filling out this page) Reference: —Line · Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)