200822848 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種防止逆流裝置及風扇，特別關於 一種以外掛卡固方式結合之防止逆流裝置及風扇。 【先前技術】 隨著電子產品朝向高性能、高頻率、高速度與輕薄 化的迅速發展，造成電子產品的發熱溫度越來越高，因 而容易產生不穩定現象，影響產品可靠度，因此散熱已 成為目前電子產品的重要課題之一，而利用風扇作為散 熱裝置乃為常見的結構設置。 請參照第1圖所示，一種習知具有防止逆流裝置之 風扇1係包括一風扇本體U以及一扇框12。.風扇本體 11係谷置於扇框12内，一般而言，風扇本體11係具有 一葉輪及一馬達（圖未顯示），馬達帶動葉輪旋轉並產 生一氣流，氣流方向如圖所示，而扇框i 2係用以保護 風扇本體11，並提供一些固定部以使馬達之導磁線圈及 電路板等可藉由固定部而連結於扇框12。另外，扇框 U通常亦具有複數個裝設孔121，以方便使用者利用裝 设孔121將風扇1固定於其他系統。 此外，為了防止當風扇1失效或不運作時，造成風 扇1所應用之系統中的風壓，經由風扇丨之出風口 外洩，導致系統内流場變得不穩定，所以在出風口 Ο 义裝β又防止逆流裝置14，以防止氣流逆流經由出風 口 13進入系統内。 200822848 防止逆流裝置14具有一框體ι41及複數個止回片 142，框體141係藉由裝設孔121而連結並固定於扇框 12,止回片142係樞設於框體14卜並覆蓋出風口 ι3。 當風扇1作用時，氣流便經由出風口 13，並推動止回 片142而向外流出；當風扇1不作用時，止回片I*〕便 覆蓋出風口 13，而避免逆流情形發生。然而，防止逆 流裝置14雖可避免逆流，保持系統内流場的穩定，但 是防止逆流裝置14往往利用風扇丨之裝設孔121而與 扇框12連結，造成裝設孔12ι無法讓使用者利用，因 此侷限了風扇1的使用方式。 因此，如何提供一種防止逆流裝置及風扇以避免逆 流更能夠保留風扇之裝設孔供使用者應用，增加風扇使 用之靈活度，進而提升風扇之使用效能，已成為重要課 題之一 〇 【發明内容】 ，有鑑於上述課題，本發明之目的為提供一種能夠避 免逆流並保留風扇之裝設孔供使用者應用，以提升使用 效能之防止逆流裝置及風扇。 緣是’為達上述目㈤，依據本發明之一種防止逆流 裝置係連結於-風扇之出風口，並包括—框體、複數個 卡固結構以及複數個止回片。框體係具有—開口及複數 個固定部’開π與出風口對應設置；卡固結構係與框體 連結，並卡固於風扇之扇框；止回片係分別樞設於固定 200822848 部’並覆蓋開口。 為達上述目的，依據本發明之一種風扇包括一扇 框、一風扇本體以及一防止逆流裝置。扇框具有一出風 口；風扇本體係至少部分容置於扇框内；防止逆流裝置 係卡固於扇框，並包括一框體、複數個卡固結構及複數 個止回片，框體具有一開口及複數個固定部，開口與出 風口對應設置，卡固結構與框體連結，止回片分別樞設 於固定部，並覆蓋開口。 承上所述，因依據本發明之一種防止逆流裝置及風 扇係藉由外掛卡固方式而連結於扇框，故保留風扇之裝 设孔供使用者應用。與習知技術相較，本發明能夠避免 逆机產生，搭配應用於各種不同尺寸之風扇，以增加風 扇使用之靈活度，進而提升風扇之使用效能。 【實施方式】 以下將參照相關圖式，說明依據本發明較佳實施例 之一種防止逆流裝置及風扇。 請參照第2圖所示，本發明較佳實施例之一種防止 逆流裝置23係包括一框體23 1、複數個卡固結構232 以及複數個止回片233。本實施例之卡固結構232係由 框體231之一侧延伸，用以卡固於風扇之扇框，其係為 一卡勾且可與框體231為一體成型製成；當然，卡固結 構232亦可獨立設置，再與框體231連結。另外，框體 23 1係具有一開口 23 11，在開口 2311相對兩側具有二 200822848 支撐部2312 ’框體231更具有複數個固定部2313，固 定部2313分別對稱設置於支撐部2312。 請參照第3圖所示，止回片233係分別樞設於固定 部2313，並覆蓋開口 2311。當氣流通過開口 2311時， 止回片233便會以固定部2313為中心而旋轉；當無氣 流通過開口 2311時，止回片233便因重力或壓力差而 回到覆蓋開口 2311的狀態。 為了防止止回片233超過一最大行程，而無法回復 到原來的位置，故可在支撐部2312設置複數個擋止件 2314,以限制止回片233的最大行程。於本實施例中， 擋止件2314係為一凸部，並與支撐部2312連結。此外， 擋止件2314及框體231係可一體成型製成。當止回片 233旋轉至最大行程時，便會被擋止件2314擋住，而 無法再往上旋轉。因此，當無氣流時，止回片233能夠 藉由重力回到原來覆蓋的狀態。另外，止回片上具有凹 槽2332，用以減少止回片233之重量以增加其對氣流 反應之靈敏度。 明參照第4圖所示，另一種限制止回片233之最大 行程的方式係於支撐部2312設置一溝槽2315，止回片 233則對應溝槽2315位置而設置一凸件2331，藉由凸 件2331於溝槽2315内運動，以溝槽2315之長度限制 止回片233之最大行程。 請參照第5圖所示，本發明較佳實施例之一種風扇 組件2係包括一扇框21、一風扇本體22以及一防止逆 200822848 流裝置23，防止逆流裝置23係藉由卡固結構232而卡 固於扇框21。扇框21係具有一出 22係至少部分容置於扇框21内。咅風扇本體 不限定於扇框21之形狀或尺寸等本么明並 戚。。> & 1 亦不限定於風扇本 =2之種類或功能’例如可為一軸流式風扇或一離心 式風扇。 防止逆流裝置23之開口 2311係與扇框2ι之出風 口 211對應設置，扇框21更具有複數個裝設孔⑴，防 止逆流裝置23更具有複數個孔洞2316分別與裝設孔 212相對設置，以供使用者藉由孔洞23 16及裝設孔川 而將風扇組件2固定於應用的系統。由於防止逆流裝置 23係以外掛卡时式連結於扇框2卜故_㈣裝設 孔212供使用者應用。另外，亦可縮小防止逆流裝置 23之尺寸’使得防止逆流裝置23不播住風扇組件2之 裝設孔212;或者，改變卡固結構232的設置位置，同 樣能夠達到保留裝設孔212之目的。 綜上所述，本發明之防止逆流裝置及風扇組件係藉 由外掛卡固方式而連結於餘，故保留裝設孔供使用者 應用。與習知技術相較’本發明能夠避免逆流產生，搭 配應用於各種不fi]尺寸之風扇，以增加風扇使用之靈活 度，進而提升風扇組件之使用效能。 以上所述僅為舉例性，而非為限制性者。任何未脫 離本發明之精神與範疇，而對其進行之等效修改或變 更，均應包含於後附之申請專利範圍中。 200822848 【圖式簡單說明】 第1圖係為一種習知具有防止逆流裝置之風扇之 示意圖； 第2圖係依據本發明較佳實施例之一種防止逆流 裝置之分解圖； 第3圖係依據本發明較佳實施例之防止逆流裝置 之組合與作動圖； 第4圖係依據本發明較佳實施例之防止逆流裝置 利用溝槽方式限制止回片最大行程之示意圖；以及 第5圖係依據本發明較佳實施例之一種裝設防止 逆流裝置之風扇之示意圖。 元件符號說明： 1、2 風扇 12、21 扇框 13、211 出風口 141、231 框體 2311 開口 2313 固定部 2315 溝槽 232 卡固結構 2332 凹槽 11、22 風扇本體 121、212 裝設孔 14、23 防止逆流裝置 142、233 止回片 2312 支撐部 2314 擋止件 2316 孔洞 2331 凸件BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-backflow device and a fan, and more particularly to an anti-backflow device and a fan combined with an externally-engaged clamping method. [Prior Art] With the rapid development of electronic products toward high performance, high frequency, high speed and lightness and thinness, the heating temperature of electronic products is getting higher and higher, which is prone to instability and affects product reliability. It has become one of the important topics in current electronic products, and the use of a fan as a heat sink is a common structural arrangement. Referring to Fig. 1, a conventional fan 1 having a backflow prevention device includes a fan body U and a frame 12. The fan body 11 is placed in the fan frame 12. Generally, the fan body 11 has an impeller and a motor (not shown). The motor drives the impeller to rotate and generates an air flow, and the air flow direction is as shown in the figure. The fan frame i 2 is used to protect the fan body 11 and provides some fixing portions so that the magnetic coil and the circuit board of the motor can be coupled to the fan frame 12 by the fixing portion. In addition, the fan frame U usually has a plurality of mounting holes 121 for the user to fix the fan 1 to other systems by using the mounting holes 121. In addition, in order to prevent the wind pressure in the system to which the fan 1 is applied when the fan 1 fails or does not operate, the air outlet of the fan is leaked through the air outlet of the fan, and the flow field in the system becomes unstable, so the air outlet is deviated. The beta is further protected against the counterflow device 14 to prevent backflow of airflow through the air outlet 13 into the system. 200822848 The anti-backflow device 14 has a frame body ι41 and a plurality of check pieces 142. The frame body 141 is connected and fixed to the fan frame 12 by the mounting hole 121, and the check piece 142 is pivotally disposed on the frame body 14 and Cover the air outlet ι3. When the fan 1 is actuated, the airflow flows outward through the air outlet 13 and pushes the check piece 142; when the fan 1 is inoperative, the check piece I*] covers the air outlet 13 to prevent backflow. However, the backflow preventing device 14 can prevent the backflow and maintain the stability of the flow field in the system. However, the backflow preventing device 14 is often connected to the fan frame 12 by the mounting hole 121 of the fan, so that the mounting hole 12ι cannot be utilized by the user. Therefore, the use of the fan 1 is limited. Therefore, how to provide a backflow prevention device and a fan to prevent backflow can retain the mounting hole of the fan for the user to use, increase the flexibility of the fan, and thereby improve the performance of the fan, which has become an important subject. In view of the above problems, an object of the present invention is to provide a backflow preventing device and a fan which can avoid backflow and retain a mounting hole of a fan for use by a user to improve the performance. The edge is 'to achieve the above item (5), and the anti-backflow device according to the present invention is coupled to the air outlet of the fan, and includes a frame, a plurality of fastening structures, and a plurality of check pieces. The frame system has an opening and a plurality of fixing portions 'opening π corresponding to the air outlet; the fastening structure is coupled with the frame body and is fixed to the fan frame of the fan; the locking piece is respectively pivoted to the fixed portion of 200822848' Cover the opening. To achieve the above object, a fan according to the present invention includes a fan frame, a fan body, and a backflow prevention device. The fan frame has an air outlet; the fan system is at least partially accommodated in the fan frame; the backflow prevention device is fixed to the fan frame, and includes a frame body, a plurality of fastening structures and a plurality of check pieces, and the frame body has An opening and a plurality of fixing portions are disposed corresponding to the air outlet, and the fastening structure is coupled to the frame body, and the check pieces are respectively pivoted on the fixing portion and cover the opening. As described above, since the anti-backflow device and the fan are connected to the fan frame by the external fastening method according to the present invention, the mounting hole of the fan is reserved for the user to apply. Compared with the prior art, the present invention can avoid the counter-machine generation and can be applied to fans of various sizes to increase the flexibility of the fan, thereby improving the performance of the fan. [Embodiment] Hereinafter, an anti-backflow device and a fan according to a preferred embodiment of the present invention will be described with reference to the related drawings. Referring to FIG. 2, a backflow prevention device 23 according to a preferred embodiment of the present invention includes a frame body 23 1 , a plurality of fastening structures 232 , and a plurality of check pieces 233 . The fastening structure 232 of the embodiment is extended from one side of the frame 231 for fastening to the fan frame of the fan, which is a hook and can be integrally formed with the frame 231; The structure 232 can also be independently provided and coupled to the frame 231. In addition, the frame 23 1 has an opening 23 11 and two sides on opposite sides of the opening 2311. The support portion 2312 ′ has a plurality of fixing portions 2313 , and the fixing portions 2313 are symmetrically disposed on the supporting portion 2312 . Referring to Fig. 3, the check pieces 233 are respectively pivoted to the fixing portion 2313 and cover the opening 2311. When the airflow passes through the opening 2311, the check piece 233 is rotated about the fixed portion 2313; when no air flows through the opening 2311, the check piece 233 returns to the state of covering the opening 2311 due to gravity or pressure difference. In order to prevent the check piece 233 from exceeding a maximum stroke and failing to return to the original position, a plurality of stoppers 2314 may be provided on the support portion 2312 to limit the maximum stroke of the check piece 233. In the present embodiment, the stopper 2314 is a convex portion and is coupled to the support portion 2312. In addition, the stopper 2314 and the frame 231 can be integrally formed. When the check piece 233 is rotated to the maximum stroke, it is blocked by the stopper 2314 and cannot be rotated upward. Therefore, when there is no air flow, the check piece 233 can return to the original covered state by gravity. In addition, the check piece has a recess 2332 for reducing the weight of the check piece 233 to increase its sensitivity to air flow. Referring to FIG. 4, another way of limiting the maximum stroke of the check piece 233 is to provide a groove 2315 in the support portion 2312, and the check piece 233 is provided with a protrusion 2331 corresponding to the position of the groove 2315. The male member 2331 moves within the groove 2315 to limit the maximum stroke of the check piece 233 by the length of the groove 2315. Referring to FIG. 5, a fan assembly 2 according to a preferred embodiment of the present invention includes a fan frame 21, a fan body 22, and an anti-reverse 200822848 flow device 23 for preventing the backflow device 23 from being secured by the structure 232. And stuck in the fan frame 21. The fan frame 21 has a line 22 that is at least partially received within the fan frame 21. The fan body is not limited to the shape or size of the fan frame 21, and the like. . >& 1 is also not limited to the type or function of the fan version = 2 ', for example, an axial fan or a centrifugal fan. The opening 2311 of the anti-flow device 23 is disposed corresponding to the air outlet 211 of the fan frame 2, and the fan frame 21 further has a plurality of mounting holes (1), and the backflow preventing device 23 further has a plurality of holes 2316 respectively disposed opposite to the mounting holes 212. For the user to fix the fan assembly 2 to the application system by means of the holes 23 16 and the installation of the holes. Since the backflow prevention device 23 is attached to the fan frame 2, it is connected to the frame 2, and the hole (212) is provided for the user to apply. In addition, the size of the anti-current flow device 23 can be reduced to prevent the backflow device 23 from being placed on the mounting hole 212 of the fan assembly 2; or the setting position of the fastening structure 232 can be changed, and the purpose of retaining the mounting hole 212 can also be achieved. . In summary, the anti-backflow device and the fan assembly of the present invention are connected by the external fastening method, so that the mounting holes are reserved for the user to apply. Compared with the prior art, the present invention can avoid the occurrence of backflow, and is applied to various fans of different sizes to increase the flexibility of the use of the fan, thereby improving the performance of the fan assembly. The above is intended to be illustrative only and not limiting. Any changes or modifications to the spirit and scope of the present invention are intended to be included in the scope of the appended claims. 200822848 [Simplified description of the drawings] Fig. 1 is a schematic view of a conventional fan having a backflow prevention device; Fig. 2 is an exploded view of a backflow prevention device according to a preferred embodiment of the present invention; The combination and actuation diagram of the anti-backflow device of the preferred embodiment of the invention; FIG. 4 is a schematic diagram of the maximum flow prevention of the checkback device by using a trench method according to a preferred embodiment of the present invention; and FIG. A schematic view of a fan incorporating a backflow prevention device in accordance with a preferred embodiment of the invention. Description of component symbols: 1, 2 fan 12, 21 fan frame 13, 211 air outlet 141, 231 frame 2311 opening 2313 fixing portion 2315 groove 232 fastening structure 2332 groove 11, 22 fan body 121, 212 mounting hole 14 23, anti-backflow device 142, 233, check piece 2312, support portion 2314, stopper 2316, hole 2331, convex member