200950682 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種導熱模組，特別是指一種具有鰭 片的氣冷式導熱模組。 【先前技術】 參閱圖1，習知的導熱模組1，包含一鰭片座17、_設 於該鰭片座17上的底座11、一自該底座η中央突伸的軸 管12、一設於該軸管12内的軸承1〇、一套設於該軸管12 Ο 周緣的電路板13、多數片重疊環設於該轴管12周圍的石夕鋼 片14、多數纏繞於矽鋼片14的線圈16,及一扇輪單元15 ，其中，該扇輪單元15包括一呈中空並能罩蓋所述矽鋼片 14與線圈16的輪轂151、一轉動地穿設於該轴承1〇並與 該輪轂151連接的軸桿152、多數個分別自該輪轂151向外 突伸的扇葉153，及一環設於該輪轂151之内周面的磁鐵環 154 ° 〇 該電路板13經由外界電源通電運作後’將所述矽鋼片 14與線圈16通電激磁而產生交變磁場，接著，藉由該磁鐵 ，154與所述矽鋼片14及線圈16的磁力相斥，使該磁鐵 環154產生旋轉，進而將外部空氣導入内部與該鰭片座口 上之多數鰭片171進行熱交換，達到導熱之目的。 然而，若縮小所㈣鋼片14與線圈16的體積，__般 會造成通電激磁所產生的磁斥力降低，進而影響該扇心 轉動的速度，相對降低所述^ m的_效率因 此，所述彻14與線圈16需佔有-定的體積，來維持 5 200950682 通電激磁時所產生的磁斥力，相對使該導熱模組1的薄化 受到限制。 【發明内容】 因此，本發明之目的，即在提供一種能薄化而縮減厚 度體積的氣冷式導熱模組。 於是’本發明之氣冷式導熱模組，包含一定子單元、 一趙片單元、一轉子單元，及一驅動單元。 該疋子單元包括一底座，及一自該底座向上延伸的固200950682 IX. Description of the Invention: [Technical Field] The present invention relates to a heat conduction module, and more particularly to an air-cooled heat conduction module having fins. [Previous Art] Referring to FIG. 1 , a conventional heat conduction module 1 includes a fin holder 17 , a base 11 disposed on the fin seat 17 , and a shaft tube 12 protruding from a center of the base η. a bearing 1 设 disposed in the shaft tube 12, a set of circuit boards 13 disposed on the periphery of the shaft tube 12, and a plurality of sheets of overlapping steel rings 14 disposed around the shaft tube 12, most of which are wound around the steel sheet a coil 16 of 14 and a wheel unit 15, wherein the fan unit 15 includes a hub 151 that is hollow and can cover the silicon steel sheet 14 and the coil 16, and is rotatably inserted through the bearing 1 a shaft 152 connected to the hub 151, a plurality of blades 153 protruding outward from the hub 151, and a ring of magnets 154 disposed on the inner circumference of the hub 151. The circuit board 13 is powered by an external power source. After the energization operation, the silicon steel sheet 14 and the coil 16 are energized to generate an alternating magnetic field, and then the magnet 154 repels the magnetic force of the silicon steel sheet 14 and the coil 16 to rotate the magnet ring 154. And introducing external air into the interior to exchange heat with the plurality of fins 171 on the fin seat to reach The purpose of heat conduction. However, if the volume of the (four) steel sheet 14 and the coil 16 is reduced, the magnetic repulsion force generated by the energization excitation is reduced, which in turn affects the speed of the rotation of the fan core, and the efficiency of the ^ m is relatively lowered. The volume 14 and the coil 16 need to occupy a predetermined volume to maintain the magnetic repulsion force generated when the 5200950682 is energized, and the thinning of the heat conducting module 1 is restricted. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an air-cooled heat-conducting module that can be thinned and reduced in thickness. Thus, the air-cooled heat conduction module of the present invention comprises a certain subunit, a Zhao film unit, a rotor unit, and a driving unit. The dice unit includes a base and a solid extending upward from the base
定轴’其中’該底座具有一與該固定轴連接的本體，及一 自該本體向上延伸且與該固定轴相間隔的支撐體。 该鰭片單元包括多數片自該底座之本體向上延伸的第 一鰭片，所述第一鰭片環繞該固定軸且相互間隔設置。 "亥轉子單元包括一設在該定子單元之固定軸上的扇輪 »又置於該扇輪上的磁鐵環、一貼置於該磁鐵環頂面的 第一矽鋼片，及一貼置於該磁鐵環底面的第二矽鋼月，其 中:該扇輪具有一樞設在該固定轴上的套筒、多數片自該 套筒向外輻射延伸的第_扇葉、一環設於所述第一扇葉外 端緣的中空狀環框，另於該套筒與該固定轴之間係設置有 至少一軸承。 該驅動單元包括-套設於該磁鐵環外周緣且位於該第 一、^鋼片之間並固定㈣支撐體上的電路板、環繞佈 设：二電路板上且分別面對該第一、二残片的一第一、 :並用二及電連接該電路板且與該第―、二石夕鋼片相間 隔谓測該轉子單元之磁性變化的-感應元件，該第 6 200950682 、一線圈組通電激磁產生交變磁場，而使該第一、二矽 鋼片因其磁斥力而轉動，連帶驅動該磁鐵環旋轉。 本發明之功效在於，藉由將該第一、二線圈組通電激 磁’使該磁鐵環上的第―、二矽鋼片因其磁斥力產生轉動 而連帶驅動該扇輪旋轉，進而使外部導入的空氣與該鰭片 •^元進行熱父換’不僅能有效精簡其内部的通電激磁構件 ’更使發鋼片及磁鐵環所佔用之空間得以縮減，有利於的 薄化該氣冷式導熱模組。 〇 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之較佳實施例的詳細說明中，將可清楚 的呈現。 參閱圖2 ’本發明氣冷式導熱模組2之較佳實施例，包 含一定子單元3、一鰭片單元6、一轉子單元4,及一驅動 單元5。 參閱圖2、3，該定子單元3包括一底座31，及一自該 〇 底座31中心處向上延伸的固定軸32,其中，該底座31具 有一與該固定軸32連接的本體311，及一自該本體311向 上延伸且與該固定軸32相間隔的支撐體312。 該底座31之支撐體312形成有四個供螺絲31〇鎖置的 固疋部313，及四個對應設在所述固定部313上且可供螺絲 310穿伸並由塑膠材料所製成的墊件314。 該鰭片單元6包括多數片自該底座31之本體311向上 延伸的第一鰭片61，及多數片自該本體311向上延伸且相 7 200950682 間隔地環設於所述第—鰭片61外圍的第二鰭片62，其中， 所述第一鰭片61環繞該固定軸32且相互間隔設置，而且 每一第一鰭片61之高度係大於每一第二鰭片62之高度。 ❹The fixed shaft 'where' the base has a body coupled to the fixed shaft, and a support extending upwardly from the body and spaced from the fixed shaft. The fin unit includes a plurality of first fins extending upward from the body of the base, the first fins surrounding the fixed axis and spaced apart from each other. "Hai rotor unit includes a fan wheel disposed on a fixed shaft of the stator unit » a magnet ring disposed on the fan wheel, a first silicon steel sheet attached to the top surface of the magnet ring, and an attachment a second steel month of the bottom surface of the magnet ring, wherein: the fan wheel has a sleeve pivoted on the fixed shaft, a plurality of blades radiating from the sleeve, and a ring is disposed on the fan blade The hollow ring frame of the outer edge of the first blade is disposed with at least one bearing between the sleeve and the fixed shaft. The driving unit includes: a circuit board sleeved on an outer circumference of the magnet ring and located between the first and second steel sheets and fixed to the (four) supporting body, and a surrounding circuit: two circuit boards facing the first, respectively a first component of the two residual pieces: a second sensing unit that electrically connects the circuit board and is spaced apart from the first and second stone sheets to measure the magnetic change of the rotor unit, the sixth 200950682, a coil group The energization excitation generates an alternating magnetic field, and the first and second steel sheets are rotated by their magnetic repulsion, and the magnet ring is driven to rotate. The invention has the effect that the first and second coil sets are energized and excited to make the first and second steel sheets on the magnet ring rotate by the magnetic repulsion force to drive the fan wheel to rotate, thereby externally introducing The air and the fins of the ^• element are replaced by a hot father, which not only effectively reduces the internal energized excitation member, but also reduces the space occupied by the steel sheet and the magnet ring, thereby facilitating thinning of the air-cooled heat-conductive mold. group. The above and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to Fig. 2, a preferred embodiment of the air-cooled heat conducting module 2 of the present invention comprises a certain subunit 3, a fin unit 6, a rotor unit 4, and a driving unit 5. Referring to FIGS. 2 and 3, the stator unit 3 includes a base 31 and a fixed shaft 32 extending upward from the center of the base 31. The base 31 has a body 311 connected to the fixed shaft 32, and a base A support body 312 extending upward from the body 311 and spaced apart from the fixed shaft 32. The support body 312 of the base 31 is formed with four fixing portions 313 for locking the screws 31, and four correspondingly disposed on the fixing portion 313 for the screws 310 to be pierced and made of plastic material. Pad 314. The fin unit 6 includes a plurality of first fins 61 extending upward from the body 311 of the base 31, and a plurality of sheets extend upward from the body 311 and are spaced around the first fin 61 at intervals of 200950682. The second fins 62 are disposed around the fixed axis 32 and spaced apart from each other, and the height of each of the first fins 61 is greater than the height of each of the second fins 62. ❹
該轉子單元4包括一設在該定子單元3之固定軸32上 的扇輪41、一設置於該扇輪41上的磁鐵環42、一貼置於 該磁鐵環42頂面的第一矽鋼片43,及一貼置於該磁鐵環 42底面的第二矽鋼片44,其中，該扇輪41具有一樞設在 該固定軸32上的套筒411、多數片自該套筒411向外輻射 延伸的第一扇葉412、一環設於所述第一扇葉412外端緣的 中空狀環框413、一自該環框413周緣向外延伸的基壁414 ’及多數片間隔設置在該基壁414上的第二扇葉415。 另外，該轉子單元4更包括三個設置於該套筒411與該 固定軸32之間的軸承45，本實施例雖然採用三個軸承45 ，但是也可以只採用一個或其他數量的轴承衫，此種替換 為其所屬技術領域中具有通常知識者容易完成，故不應以 侷限於本實施例對於轴承45數量上的說明。 該第-矽鋼片43具有一呈中空狀的第—環片部431， 及多數個自該第-環片冑431周緣間隔向外延伸的第一突 二部432’其中，該第-環片部431係套置於該扇輪μ之 %框413且貼置於該磁鐵環42頂面。 进參閱圖2、4’該第二石夕鋼片44具有—呈中空狀的第二 =片部44卜及多數個自該第二環片部44ι周緣間隔向外延 =第一突片部442 ’其中’該第二環片部441係套置於該 扇輪41之環框413且貼置於該磁鐵環42底面，而且，所 200950682 述第二突片部442與所述第一突片部432相互交錯（如圖4 所示）。 續參閱圖2、3，該驅動單元5包括套設於該磁鐵環42 外周緣且位於該第一、二矽鋼片43、44之間並固定於該支 撐體312上的一電路板51、環繞佈設於該電路板51上且分 別面對該第一、二矽鋼片43、44的一第一、二線圈組52、 53，及一電連接該電路板51且與該第一、二矽鋼片43、44 相間隔並用以偵測該轉子單元4之磁性變化的感應元件54 ❹ 該電路板51疊置於該底座31之墊件314上，並藉由 所述螺絲310將該電路板51鎖設固定於該支推體312之固 定部313，而且該第一、二矽鋼片43、44之第一、二突片 部432、442係分別面對該第一、二線圈組52、53。 再者’該驅動單元5之第一、二線圈組52、53是分別 設於該電路板51的相反兩面，並採用兩條金屬線以彼此相 反的方向連續捲曲環繞佈設而成，每一條金屬線可以構成 φ 許多線圈亟數（其線圈匝的外觀上是如指紋形式的同心圓 態樣’各個線圈租又以同心圓方式環繞著該電路板51中心 排列）。 在此要說明的是，由於該磁鐵環42相反兩面具有的不 同磁性，使分別靠貼於該磁鐵環42相反兩面的第一梦鋼片 43與第二矽鋼片44具有兩相反磁性，藉此利用該第一、二 突片部432、442分別與該第一、二線圈組52、53磁力互 斥’驅動該第一、二矽鋼片43、44轉動。 9 200950682 其中，為使該第一、二矽鋼片43、44持續轉動，該驅 動單元5之感應元件54係用來感測該第一、二石夕鋼片43、 44之磁性，進而控制導通於該第一、二線圈組52、％之電 流方向，相對使該第一、二線圈組52、53隨時配合產生相 對應的磁性，進而磁斥該第一、二石夕鋼片、44旋轉，由 於該感應元件54為所屬技術領域中具有通常知識者所熟知 ’其細部構件與動作即不再多加贅述。 依據上述之設計，該扇輪41之第一扇葉412是為一轴 Ο 向式風扇，第二扇葉415則為一離心式風扇，因此當該扇 輪41轉動時，該第一扇葉411是將氣流由上往下導引進入 第一扇葉415中，再利用該第二扇葉415將空氣由侧向導 流出去，而形成一軸向進風、側向出風之扇輪。 而且，利用每一第一鰭片61高於每一第二鰭片62的 設計，使該第一鰭片61容置於所述第二扇葉415間，以便 由第一扇葉412自導入外部熱交換的氣流，並藉由與所述 第二扇葉415將該底座31之本體311周緣熱量的隨著側向 © 氣流導出，用以加強導熱的效率。 由於該第一、二線圈組52、53是佈設於該電路板51 上，對於圖1習知技術所示之線圈16纏繞於所述矽鋼片u 所佔用之空間即能夠有效縮減，而且該第一、二矽鋼片43 44是厚度相當薄的薄片狀結構，相較於圖1習知技術所 不之梦鋼片14是以複數片層4所構成’顯然亦能有效降低 厚度，再者，圖1習知技術所示之磁鐵環154，必須與所述 碎鋼片14、線圈16相配合感應而在其厚度上大於石夕鋼片 10 200950682 14與線圈16兩者之總和，反觀本實施例卻是因為該第一、 二線圈組52、53與該第_、二石夕鋼片43、料都是厚度極 薄的構造，並且該磁鐵環42又被該第一、二矽鋼片43、44 所夾置侷限，故該磁鐵環42也能有效縮減厚度。因此，由 於本實施例之第一、二線圈組 52、53、第一 二矽鋼片 43 、44、磁鐵環42軸減少厚度，故職冷式導減組2便 能有效薄化而縮減厚度體積。The rotor unit 4 includes a fan wheel 41 disposed on the fixed shaft 32 of the stator unit 3, a magnet ring 42 disposed on the fan wheel 41, and a first silicon steel sheet attached to the top surface of the magnet ring 42. And a second silicon steel sheet 44 attached to the bottom surface of the magnet ring 42, wherein the fan wheel 41 has a sleeve 411 pivotally mounted on the fixed shaft 32, and a plurality of sheets radiate outward from the sleeve 411. An extended first fan blade 412, a hollow ring frame 413 disposed at an outer edge of the first blade 412, a base wall 414' extending outward from a periphery of the ring frame 413, and a plurality of pieces spaced apart from each other A second blade 415 on the base wall 414. In addition, the rotor unit 4 further includes three bearings 45 disposed between the sleeve 411 and the fixed shaft 32. Although three bearings 45 are used in this embodiment, only one or other number of bearing shirts may be used. Such replacement is readily accomplished by those of ordinary skill in the art and should not be limited to the description of the number of bearings 45 in this embodiment. The first bismuth steel sheet 43 has a hollow first ring portion 431, and a plurality of first projections 432' extending outward from the periphery of the first ring 431, wherein the first ring The portion 431 is placed over the frame 413 of the fan wheel μ and placed on the top surface of the magnet ring 42. Referring to FIGS. 2 and 4', the second stone-like steel sheet 44 has a hollow second-shaped portion 44 and a plurality of portions from the second ring-shaped portion 44 ι spaced apart toward the extension = first tab portion 442 'The second ring portion 441 is sleeved on the ring frame 413 of the fan wheel 41 and attached to the bottom surface of the magnet ring 42. Moreover, the second tab portion 442 and the first tab are described in 200950682. Portions 432 are interleaved (as shown in Figure 4). 2, 3, the driving unit 5 includes a circuit board 51 disposed on the outer circumference of the magnet ring 42 and located between the first and second steel sheets 43 and 44 and fixed on the support body 312. a first and second coil sets 52, 53, respectively disposed on the circuit board 51 and facing the first and second steel sheets 43, 44, and an electrical connection between the circuit board 51 and the first and second steel sheets 43, 44 sensing elements 54 spaced apart from each other for detecting the magnetic change of the rotor unit 4 ❹ The circuit board 51 is stacked on the pad 314 of the base 31, and the circuit board 51 is locked by the screw 310 The fixing portion 313 fixed to the supporting body 312 is disposed, and the first and second tab portions 432 and 442 of the first and second steel sheets 43 and 44 face the first and second coil groups 52 and 53, respectively. Furthermore, the first and second coil groups 52 and 53 of the driving unit 5 are respectively disposed on opposite sides of the circuit board 51, and are formed by continuously winding and winding two metal wires in opposite directions to each other, each metal. The line can constitute φ a number of turns of the coil (the coil turns are in the form of concentric circles like fingerprints), and the respective coils are arranged in a concentric manner around the center of the circuit board 51. It should be noted that, due to the different magnetic properties of the opposite sides of the magnet ring 42, the first dream steel sheet 43 and the second silicon steel sheet 44 respectively adhered to opposite sides of the magnet ring 42 have opposite magnetic properties, thereby The first and second tab portions 432 and 442 are magnetically mutually exclusive with the first and second coil groups 52 and 53 to drive the first and second steel sheets 43 and 44 to rotate. 9 200950682 wherein, in order to continuously rotate the first and second steel sheets 43, 44, the sensing element 54 of the driving unit 5 is used to sense the magnetic properties of the first and second stone sheets 43, 44, thereby controlling conduction. In the current direction of the first and second coil groups 52 and %, the first and second coil groups 52 and 53 are matched at any time to generate corresponding magnetic properties, thereby magnetically repelling the first and second stone sheets and 44 rotations. Since the sensing element 54 is well known to those of ordinary skill in the art, its detailed components and actions will not be described again. According to the above design, the first blade 412 of the fan wheel 41 is a shaft-turning fan, and the second blade 415 is a centrifugal fan, so when the fan wheel 41 rotates, the first blade 411 is to guide the airflow from the top to the bottom into the first blade 415, and then use the second blade 415 to flow the air out from the side guide to form an axially-input, lateral-winding fan wheel. . Moreover, the first fins 61 are received between the second blades 415 by the design of each of the first fins 61 above each of the second fins 62 so as to be self-imported by the first blade 412. The externally heat-exchanged airflow is derived from the lateral © airflow of the body 311 of the base 31 by the second blade 415 to enhance the efficiency of heat conduction. Since the first and second coil sets 52 and 53 are disposed on the circuit board 51, the coil 16 shown in the prior art of FIG. 1 is wound around the space occupied by the silicon steel sheet u, which can be effectively reduced, and the first The first and second tantalum steel sheets 43 44 are sheet-like structures having a relatively thin thickness, and the dream steel sheet 14 is formed by a plurality of sheets 4 as compared with the conventional technique of Fig. 1 'obviously, the thickness can be effectively reduced, and further, The magnet ring 154 shown in the prior art of FIG. 1 must be combined with the crushed steel sheet 14 and the coil 16 to be greater than the sum of the thickness of the Shishigang sheet 10 200950682 14 and the coil 16 in the thickness thereof. For example, the first and second coil groups 52 and 53 and the first and second stone sheets 43 and the material are both extremely thin in thickness, and the magnet ring 42 is further covered by the first and second steel sheets 43. 44, the clamping is limited, so the magnet ring 42 can also effectively reduce the thickness. Therefore, since the first and second coil groups 52, 53, the first two steel sheets 43, 44, and the magnet ring 42 of the present embodiment have a reduced thickness, the occupational cooling type reduction group 2 can be effectively thinned and reduced in thickness. .
❹ 另外，該電路板51是貼靠於所述墊件314並鎖固於該 支擇體312之固定部313上，利用所述塾件314係由塑勝 材質所製成，可吸收該轉子單元4轉動時所產生的震動， 即提高該扇輪41在轉動時的穩定度。 歸納上述，本發明之氣冷式導熱模組2，利用將該第一 一線圈組52、53通電激磁，使該磁鐵環42上的第一、 二矽鋼片43、44轉動而連帶驅動該扇輪41旋轉，進而使 二部導入的空氣與關片單& 6進行熱交換，不僅簡化内 邛通電激磁之構件，更縮減矽鋼片及磁鐵環所佔用之空間 ，有利溥於化該氣冷式導熱模組2，故確實能達到本發明之 目的。 惟以上所述者’僅為本發明之較佳實施例而已，當不 b 乂此限疋本發明實施之範圍即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 、 圖1是一剖視圖，說明習知導熱模組之態樣； 11 200950682In addition, the circuit board 51 is abutted against the pad member 314 and is fixed on the fixing portion 313 of the supporting body 312. The ball piece 314 is made of a plastic material, and the rotor can be absorbed. The vibration generated when the unit 4 rotates, that is, the stability of the fan wheel 41 when it is rotated. In summary, the air-cooled heat-conducting module 2 of the present invention electrically energizes the first coil group 52, 53 to rotate the first and second silicon steel sheets 43, 44 on the magnet ring 42 to drive the fan. The wheel 41 rotates, so that the air introduced by the two parts is exchanged with the closing sheet & 6 , which not only simplifies the internal excitation and excitation of the components, but also reduces the space occupied by the silicon steel sheet and the magnet ring, which is beneficial to the air cooling. The heat conduction module 2 can indeed achieve the object of the present invention. However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention to the simple equivalent variation and modification of the scope of the invention and the description of the invention. All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the state of a conventional heat conduction module; 11 200950682
圖2是一立體分解圖，說明本發明氣冷式導熱模組之 較佳實施例； 圖3是一剖視圖，說明該較佳實施例之結構；及 圖4是一部份俯視圖，說明該較佳實施例之第一、二 矽鋼片交錯的態樣。 12 200950682Figure 2 is a perspective exploded view of a preferred embodiment of the air-cooled heat-conducting module of the present invention; Figure 3 is a cross-sectional view showing the structure of the preferred embodiment; and Figure 4 is a partial plan view showing the comparison The first and second steel sheets of the preferred embodiment are staggered. 12 200950682
【主要元件符號說明】 2 *…* •氣冷式導熱模組 ♦ ¢. < ^ ♦ •第一矽鋼片 3 .•… ……定子早元 431 •。第一環片部 31 * · · …底座 4 3 2 · * ；> * <* -第一突片部 310 ……螺絲 •-第二矽鋼片 311 ·· ……本體 441*"·· -第二環片部 312 * ……支撑體 442 ^ ^ •第二突片部 313 -固定部 45 轴承 314 ·· * " " {牛 5……' · …驅動單元 3 2 * * · · *固定軸 51 ·*··*· ••電路板 4… ……轉子单元 5 2……。 ••第一線圈組 ……扇輪 •第二線圈組 411 * * ……《套筒 54 ·…… ••感應元件 412 · -…第一扇葉 •鰭片單元 413 - ……框 1 ♦ β * » * y •第一鰭片 414 ·· •…基壁 2 * · * # * * » ••弟二縛片 415 · ……第二扇葉 ^ ¢. ^ 1 ……磁鐵環 13[Main component symbol description] 2 *...* • Air-cooled thermal conductivity module ♦ ¢. < ^ ♦ • First silicon steel sheet 3 .•... ...... stator early element 431 •. First ring portion 31 * · · ... base 4 3 2 · * ;> * <* - first tab portion 310 ... screw • second steel sheet 311 ··... body 441*" - second ring piece portion 312 * ... support body 442 ^ ^ • second tab portion 313 - fixing portion 45 bearing 314 ·· * """ {牛5......' ... drive unit 3 2 * * · · * Fixed shaft 51 · *··*· ••Board 4.........Rotor unit 5 2... • • First coil set... Fan wheel • Second coil set 411 * * ... "Sleeve 54 ·... • Inductive element 412 · -... First blade • Fin unit 413 - ... Box 1 ♦ β * » * y • First fin 414 ·· •...Base wall 2 * · * # * * » ••弟二扣片415 · ......Second leaf blade ^ ¢. ^ 1 ...... Magnet ring 13