201017076 九、發明說明： 【發明所屬之技術領域】 本發明關於一種阻逆流裝置，特別是關於一種衛浴室 通風管道的阻逆流裝置。 【先前技術】 按公寓大厦等集合住宅的衛浴室通常為一未直接設 ❿置通風口的空間，於衛浴室關門使用時，該衛浴室即形成 一與外界近乎隔絕的密閉空間，其使用時所產生的熱氣或 泪氣等有毒氣體無法排出，或僅能排向自家的客廳或臥房 等其他空間，此將嚴重影響使用者使用上的衛生性及安全 性。 為克服此種問題，集合住宅的衛浴室通常於其天花板 設置抽風機，並經由通風管道接通至集合住宅的公共管道 間，再連通至例如頂樓等外界。依此，衛浴室内部的氣體 φ 即得經由抽風機抽送，經通風管道、公共管道間而排放至 外界》201017076 IX. Description of the Invention: [Technical Field] The present invention relates to a backflow prevention device, and more particularly to a backflow prevention device for a bathroom ventilation duct. [Prior Art] The bathroom of a condominium such as an apartment building is usually a space where there is no direct venting opening. When the bathroom is closed, the bathroom forms a confined space that is almost isolated from the outside world. The generated toxic gas such as hot air or tear gas cannot be discharged, or can only be discharged to other spaces such as the living room or bedroom of the home, which will seriously affect the hygienic and safety of the user. In order to overcome this problem, the bathroom of the condominium is usually provided with an exhaust fan on the ceiling and connected to the common pipe of the condominium through a ventilation duct, and then connected to the outside such as the top floor. According to this, the gas φ inside the bathroom is pumped through the exhaust fan and discharged to the outside through the ventilation duct and the common duct.
V 亦即，集合住宅之各樓層住戶的衛浴室皆以其抽風機 機通風管道連通至公共管道間，以期利用該公共管道間將 各樓層衛冷室的氣體排放至外界。而此亦同時意味著經由 公共管道間的媒介，使得各樓層住戶的各衛浴室與公共管 .道間之間、以及各樓層住戶的各衛浴室之間皆形成一相互 連通的管道空間。 然而，公共管道間匯集了各樓層住戶之各衛浴室的氣 201017076 體’其氣味五味雜陳，令人嫌惡。而衛浴室的通風管道與 公共管道間相通’且其氣流方向具有可逆性。因而，在抽 風機未運作的情況下，公共管道間的嫌惡空氣即容易自通 風管道侵入於各樓層住戶的衛浴室，令人作惡，降低生活 品質’並危害住戶的身心健康；此於強風自頂樓沿公共管 道間灌下、而將其惡臭沿通風管道大量且急速地侵入於各 樓層衛浴室時更為嚴重。 再者’不同樓層衛浴室所產生的不雅氣體例如抽煙的 煙味、或有毒氣鱧例如燒碳所產生的一氧化碳，亦會循著 公共管道間及通風管道輾轉侵入於其他樓層的衛浴室，造 成衛生上及安全上的極大困擾及危害。 以上原因’造成習知衛浴室抽風設備及其通風管道的 應用性不佳。 【發明内容】 本發明之目的在於提供一種衛浴室通風管到的阻逆 流裝置，用以阻擋通風管道之氣流逆流進入衛浴室。 本發明之另一目的在於提供一種便於安裝的衛浴室 通風管道的阻逆流裝置。 本發明之再一目的在於提供一應用性佳的衛浴室通 風管道的阻逆流裝置。 為達上述目的’本發明提供一衛浴室通風管道的阻逆 流裝置，裝設於衛浴室通向一外部設備的一通風管道上， 該阻逆流裝置包括有：一殼體，其内圍具有一容置空間， 201017076 - 並於該容置空間的相對端部分別形成一進氣端開口與一 出乳端開口；一進氣端單元，設於進氣端開口，並與該進 氣端開口相通；一出氣端單元，設於出氣端開口，並與出 氣端開口相通，以及至少一阻逆流單元，裝設於容置* 間，該阻逆流單元包括有一框體其具有内圍空間，和多數 片活頁其樞設於該框體，並位於該内圍空間；該些多數片 活頁係上下排列，並部份疊合，且僅能朝向出氣端開口的 方向單向開啟。依此，允許衛浴室的氣體流通至公共管道 間’但阻擋公共管道間的惡臭氣體逆流侵入衛浴室内部， 維護住戶的環境衛生及健康安全。 較佳者’阻逆流單元的框體具有相對的一上側板與— 下側板，及相對的一左側板與一右側板；多數片活頁的各 活頁各具有一活頁本體與一轴部；活頁本體具有相對的— 上側部與一下側部，軸部乃設於活頁本體的上側部，且該 轴部的兩端突出於活頁本體並分別柩設於框體的左側板 參與右側板。依此，活頁即得以其軸部為轴而轉動，而進行 開閉的動作》 較佳者，活頁本體具有相對的一進氣端表面與一出氣 端表面’其分別朝向殼體的進氣端開口與出氣端開口，而 活頁本體的下側部係形成一外覆折板，其重疊遮覆於相鄰 下一片活頁的上側部的出氣端表面。依此，各活頁僅能朝 .向殼體的出氣端開口方向開啟，而無法朝向進氣端開口方 向開啟，因而阻擋了通風管道的氣體的逆流。 較佳者，活頁本體的上側部的出氣端表面係形成一外 201017076 斜面’而外覆折板的進氣端表面 使得活頁於旋轉動作時，其上、 内斜面。依此， 卡抵，保持其動作的順暢性。4的活1之間不會相互 較佳者’框鱧的内圍空間 、朝向進氣端開口的 < 有一内框體，以阻擋整體活頁 的位置汉 阻逆流效果。 而加強 較佳者，框體的外圍設有一 參 φ 漏塑片’以保持阻逆流 早70谷置於殼體之容置空間時的密合性。 較佳者，殼體的容置空間設 阻逆流單元朝向出氣端開口的x ;B隔框’其位於 务阳、m认玄 的位置’以區隔出一空間，避 免阻逆流單το的活頁於朝向 避 於其他物件。 氣端開口旋轉開啟時抵頂 較佳者，進氣端單元包括—進氣端板體及一與該進氣 端板體相連設及相連通的進氣 ^ ' ^„ 進氣管，進氣端板體封設於進氣 端開口，且使得進氣管與進氣 ^ ^ A_ a, 氣端開口相連通；而進氣管的 外端》P則可供與通風管道靠 、> 通。 近衛冷至抽風機的一側相接 端板=圭Γ出氣端單元包括一出氣端板體及一與該出氣 =相連設及相連通的出氣管，出氣端板體封設於出氣 外二’且使得出氣管與出氣端開口相連通；而出氣管的 卜端Μ可供與通風管道靠近外部設備的—側相接通。 較佳者，殼鍾的容置空間於朝向進氣端開口的位置設 有一風扇單元，使其兼具抽風功能。 較佳者，殼趙的容置空間設有一第二間隔框，其位於 201017076 風扇單元朝向出氣端開 風扇單元與阻逆流單元 口的位置，以區隔出一空間，避免 之間的相互抵觸而影響其動作。 【實施方式】 有關本發明之前述及其他技術内容、 以下配合參考圖式之=個 一個較佳實施例的詳 可清楚的呈現。 ❹ 請參閱第1圖至第3圖，其綠示本發明衛浴室通風管道 :::流裝置一第-實施例的結構，^第!圖是緣示該 第-實施例的分解圖’第2圖是繪示其組合剖面圖，第3 圖疋繪不其中阻逆流單元的分解圖。 本發明衛浴室通風管道的阻逆流裝置，係裝設於衛浴 室的通風管道（未圖示），該通風管道通向外部設備例如一 公共管道間。如圖所示’本發明衛浴室通風管道的阻逆流 裝置包含有：L—進氣端單元2、-出氣端單元3、V, that is, the bathroom of each floor of the collective residence is connected to the public pipeline by its exhaust duct ventilation duct, in order to use the common pipeline to discharge the gas from each floor to the outside. At the same time, it means that through the medium between the public pipes, a connecting pipe space is formed between the bathroom of each floor and the public pipe, and between the bathroom of each floor. However, the public pipes bring together the scent of the bathroom of each floor of the residents of each floor. 201017076 The body's smell is mixed, which is disgusting. The ventilation ducts of the bathroom are connected to the common ducts and the direction of the airflow is reversible. Therefore, in the case that the exhaust fan is not working, the disgusting air between the public pipes is easy to invade the bathroom of the occupants of each floor from the ventilation duct, which is evil, lowers the quality of life' and endangers the physical and mental health of the occupants; The top floor is filled along the public pipes, and the foul smell is more serious along the ventilation ducts and rapidly invading the bathroom in each floor. In addition, the indecent gases produced by different floor bathrooms, such as smoking smoke, or toxic gases such as carbon monoxide generated by burning carbon, will also follow the public pipes and ventilation ducts to invade the bathrooms on other floors. It causes great troubles and harms in terms of hygiene and safety. The above reasons have resulted in poor applicability of the custom-made bathroom exhaust equipment and its ventilation ducts. SUMMARY OF THE INVENTION It is an object of the present invention to provide a backflow prevention device for a bathroom air duct to block the flow of air from the ventilation duct into the bathroom. Another object of the present invention is to provide a backflow prevention device for an air duct of a bathroom that is easy to install. Still another object of the present invention is to provide a reversible flow-reducing device for a ventilated duct of a bathroom. In order to achieve the above object, the present invention provides a backflow prevention device for a bathroom ventilation duct, which is installed on a ventilation duct leading to an external device in the bathroom, and the backflow prevention device comprises: a casing having a cavity therein Space, 201017076 - and an inlet end opening and a milk outlet opening respectively formed at opposite ends of the accommodating space; an intake end unit, which is disposed at the inlet end opening and communicates with the inlet end opening An outlet end unit is disposed at the outlet end opening and communicates with the outlet end opening, and at least one anti-backflow unit is disposed between the accommodations*, the resistance-reverse flow unit includes a frame body having an inner circumference space, and a majority The leaflet is pivotally disposed on the frame and located in the inner space; the plurality of leaflets are arranged up and down, partially overlapped, and can only be opened unidirectionally toward the opening of the air outlet end. According to this, the gas in the bathroom is allowed to flow to the public pipe, but the malodorous gas between the public pipes is blocked from flowing into the bathroom interior to maintain the sanitation and health of the residents. Preferably, the frame of the anti-backflow unit has an upper side plate and a lower side plate, and an opposite left side plate and a right side plate; each of the leaf sheets of each of the leaf sheets has a leaflet body and a shaft portion; The upper side portion and the lower side portion are disposed, and the shaft portion is disposed on the upper side portion of the leaflet body, and both ends of the shaft portion protrude from the leaflet body and are respectively disposed on the left side plate of the frame body to participate in the right side plate. Accordingly, the leaflet is rotated by the shaft portion to perform the opening and closing operation. Preferably, the leaflet body has an opposite air inlet end surface and an air outlet end surface which respectively open toward the intake end of the housing. The outlet end is open, and the lower side of the flap body forms an outer flap that overlaps the outlet end surface of the upper side of the adjacent next sheet. Accordingly, each of the leaf sheets can be opened only toward the opening end of the air outlet end of the casing, and cannot be opened toward the opening end of the air inlet end, thereby blocking the backflow of the gas of the air duct. Preferably, the surface of the outlet end of the upper side portion of the leaflet body forms an outer 201017076 beveled surface and the outer end surface of the outer flap of the flap is such that the flap is in the upper and inner slopes when the rotary sheet is rotated. According to this, the card is pressed to maintain the smoothness of its movement. The live 1 of 4 does not match each other. The inner space of the frame, the opening toward the inlet end, has an inner frame to block the position of the entire leaflet. For better reinforcement, a peripheral surface of the frame is provided with a φ leakage plastic sheet to maintain the adhesion of the resisting flow to the accommodating space of the casing. Preferably, the housing space of the housing is arranged to block the x of the counterflow unit opening toward the air outlet end; the B partition frame is located at the position of the positron and the m apex to separate a space to avoid the flow of the counterflow το Avoiding other objects in the direction. Preferably, the air intake opening unit is provided with an intake end plate body and an intake air connecting the air intake end plate body and the air intake valve. The end plate body is sealed at the inlet end opening, and the intake pipe is connected with the intake air ^ ^ A_ a, the gas end opening; and the outer end of the intake pipe "P" is available for the ventilation pipe, > The side of the gangway is connected to the side of the exhaust fan. The outlet unit of the guzzle includes an outlet end plate and an outlet pipe connected to the outlet and the outlet. The outlet end plate is sealed outside the outlet. 'And the outlet pipe is connected to the outlet end opening; and the outlet end of the outlet pipe can be connected to the side of the ventilation pipe close to the external device. Preferably, the housing clock is accommodated in the opening toward the intake end. The position of the fan unit is provided with a fan unit. Preferably, the housing space of the shell is provided with a second spacing frame, which is located at the position of the fan unit toward the outlet end opening fan unit and the anti-backflow unit port of 201017076. Separate a space to avoid conflicts between them [Embodiment] The foregoing and other technical contents of the present invention, and the following detailed description of the preferred embodiment will be clearly described. ❹ Please refer to Fig. 1 to Fig. 3, which is a green version. Inventive bathroom ventilation duct:::flow device - the structure of the first embodiment, ^! Fig. is an exploded view of the first embodiment - Fig. 2 is a sectional view thereof, and Fig. 3 The anti-backflow device of the bathroom ventilation duct of the present invention is a ventilation duct (not shown) installed in the bathroom, and the ventilation duct leads to an external device such as a common pipe. The anti-backflow device of the bathroom ventilation duct of the present invention comprises: an L-intake end unit 2, an outlet end unit 3,
特點與功效，在 細說明當中，將 、及至夕阻逆流單^。附圖的第一實施例中係顯示具 有二阻逆流單元4。 、殼趙1的内圍具有一容置空，並於其相對的端部 分別形成一進氣端開口 i2與一出氣端開口工3。 進氣端單元2包括-進氣端板體21及—與該進氣端板 艘相連設及相連通的進氣管.進氣端板艘21封設於殼體 1的進氣端開口 12，且進氣管22與進氣端開口 12担連通。 進氣管22的外端部接通至通風管道（未圖示）靠近衛浴室 抽風機（未圖示）的一側；因此，抽風機的抽風氣流乃經由 201017076 - 進氣單元2及進氣端開口 12而進入殼體1内部。 出氣端單元3包括一出氣端板體31及一與該出氣端板 體相連設及相連通的出氣管32。出氣端板體31封設於殼體 1的出氣端開口 13，且出氣管32與出氣端開口 13相連通。 出氣管32的外端部接通至通風管道靠近公共管道（未圖示） 的一側；因此，被抽風機抽送至殼體1内部的氣流乃經由 出氣端開口 13及出氣端單元3而排放至公共管道間。 阻逆流單元4裝設於殼體1的容置空間11 ^該阻逆流單 元包括有一框體41與多數片活頁42(在實施例上係顯示具 有五片活頁）。框體41具有内圍空間411。多數片活頁42 各柩設於框體41，並位於其内圍空間411 ;各活頁42係上 下排列並°卩伤疊合，且僅能朝向殼體1的出氣端開口 13 的方向單向開啟。 在實施上，框體21具有相對的一上側板412與一下側 板413，及相對的一左側板414與一右側板415。多數片活 _頁的各活頁42各具有一活頁本逋421與一軸部422。活頁本 體421具有相對的一上側部423與一下側部424;而軸部422 設於上側部423，且軸部422的兩端突出於活頁本體421並 分別樞設於左側板414與右側板415，因此活頁“即得以其 抽部422為轴轉動而開閉。活頁42設置多片的優點係，可 相對減少各活頁的面積，使得少量的氣流即得使其轉動而 開閉，其動作靈敏性較高。 又，活頁本體421具有相對的一進氣端表面425與一出 氣端表面426,其分別朝向殼體！的進氣端開口㈣出氣端 201017076 開口 1 3 ;而活頁本體42丨的下側部424係形成一外覆折板 424a ’其重養遮覆於相鄰下一片活頁的上側部423的出氣 端表面426。因而各活頁42僅能朝向殼體1的出氣端開口 13 的方向開啟’而無法朝向進氣端開口丨2的方向開啟。依此 結構，於平常狀態下，各活頁42係呈自然下垂，並層層疊 合’因而封閉了殼體1的容置空氣U，阻擋了公共管道間 的惡臭氣流侵入衛浴室；而於衛浴室的抽風機運作時，其 φ 抽風氣流可將活頁朝向出氣端開口 13方向轉動開啟，而允 許抽風的氣流經由通風管道排放至公共管道間。 另外，活頁本體421的上側部423的出氣端表面426係 形成一外斜面427 ’而下側部424的外覆折板424a的進氣端 表面425則形成一内斜面428，使得活頁42於旋轉動作時， 其上、下片的活頁42不會相互卡抵，因而其動作順暢。 再者，阻逆流單元4的框體41的内圍空間411，於朝向 殼體1進氣端開口 12的位置設有一内框體416，以阻擋整體 粵活頁4 2四周邊的間隙氣流，而加強阻逆流效果。 此外，阻逆流單元4框鳢41的外圍設有一防漏墊片 417,當阻逆流單元4容置於殼體i的容置空間丨丨時，據以 保持其間的密合性。 又阻逆流單元4的上述各項元件係組裝成一單元體 (即該阻逆流單元），當其中—元件損壞時，只要整體抽換 該阻逆流單元4即可，其安裝及維修極為便利。 依據本發明衛浴室通風管道的阻逆流裝置，利用其中 —阻逆流單元4上下排列並部份重4且朝向出氣端心邮 11 201017076 向開啟的多數片活頁42，使得允許衛浴室的氣體通向公共 管道間，但阻擋公共管道間的惡臭氣體逆流侵入衛浴室= 部’維護住戶的環境衛生及健康安全。再者，多數片活頁 42係與其框體41組裝成一阻逆流單元4，其可容易地裝卸 於殼體1的容置空間U，因此其安裝及日後的維修均極方 便。 請參閲第4圖及第5圖，其繪示本發明衛洛室通風管道 的阻逆流裝置一第二實施例的結構，其中第4圖是繪示該 第二實施例的分解圖，第5圖是繪示其組合剖面圖。 本發明該第二實施例的結構係於前述第一實例的結 構下，進一步於殼體1的容置空間u設有一第一間隔框 其位於阻逆流單元4朝向殼體1出氣端開口〗3的位置。設置 第一間隔框5的用意在於區隔出一空間，避免阻逆流單元4 的活頁42於朝向出氣端開口 13旋轉開啟時抵頂於其他物 件。 請參閱第6圖及第8圖，其繪示本發明衛浴室通風管道 的阻逆流裝置一第三實施例的結構，其中第6圖是繪示該 第三實施例的分解圖，第7圖是繪示其組合剖面圖，第8 圖是繪示其組合外觀示意圖。 本發明該第二實施例的結構係於前述第二實例的結 構下，進一步於殼體1的容置空間u設有一風扇單元6，其 位於該容置空間11朝向進氣端開口12的位置。藉著該風扇 單元6，可加強衛浴室原有的抽風機的抽風能力。在衛浴 至未sit置抽風機或該抽風機損壞的情況下，該風扇單元亦 12 201017076 . 可取代原有抽風機的功能。亦即，依第三實施例的結構， 其同時具有阻逆流及抽風的功能。 同樣地’殼體1的容置空間U設有一第二間隔框7,其 位於風扇單元6朝向殼體1出氣端開口 13的位置，以區隔出 空間’避免風扇單元6與阻逆流單元4間的相互抵觸，而 影響風扇單元6之扇葉及阻逆流單元4之活頁42的動作。 本發明雖已藉由上述較佳實施例加以詳細說明，惟以 鲁 上所述者’僅為本發明之較佳實施例而已，當不能以此限 定本發明實施之範圍，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】 第1圖是搶示本發明衛浴室通風管道的阻逆流裝置一 第一實施例的分解圖》 第2囷是繪示該第一實施例的組合剖面圖。 φ 第3圖是繪示該第一實施例其中逆阻流單元的分解 圖。 第4圖是繪示本發明衛浴室通風管道的阻逆流裝置一 第二實施例的分解圖。 第5圖疋緣不該第二實施例的組合剖面圏。 第6囷是繪示本發明衛浴室通風管道的阻逆流裝置一 第三實施例的分解圖。 第7圖是繪示該第三實施例的組合剖面圖。 第8圖是繪示該第三實施例的組合外觀示意圖。 13 201017076 . 【主要元件符號說明】 1. 殼體 11.容置空間 1 2.進氣端開口 1 3.出氣端開口 2. 進氣端單元 21. 進氣端板體 22. 進氣管 © 3.出氣端單元 31. 出氣端板體 32. 出氣管 4.阻逆流單元 41. 框體 411. 内圍空間 412. 上側板 413. 下側板 ® 414.左側板 41 5.右側板 416. 内框體 417. 防漏墊片 42. 活頁 421.活頁本體 422.轴部 423.上側部 14 201017076 . 4 2 4.下侧部 424a.外覆折部 425. 進氣端表面 426. 出氣端表面 427. 外斜面 428. 内斜面 5. 第一間隔框 6. 風扇單元 _ 7.第二間隔框Features and effects, in the detailed description, will be, and until the end of the resistance countercurrent single ^. The first embodiment of the drawing shows a two-resistance counterflow unit 4. The inner circumference of the shell Zhao 1 has a receiving space, and an inlet end opening i2 and an outlet end opening 3 are respectively formed at opposite ends thereof. The intake end unit 2 includes an intake end plate 21 and an intake pipe connected to the intake end plate. The intake end plate 21 is sealed to the intake end opening 12 of the casing 1. And the intake pipe 22 is in communication with the intake end opening 12. The outer end of the intake pipe 22 is connected to the side of the ventilation duct (not shown) close to the bathroom exhaust fan (not shown); therefore, the exhaust airflow of the exhaust fan is via 201017076 - intake unit 2 and intake air The end opening 12 enters the interior of the housing 1. The air outlet end unit 3 includes an air outlet end plate body 31 and an air outlet pipe 32 connected to the air outlet end plate body. The outlet end plate body 31 is sealed to the outlet end opening 13 of the casing 1, and the outlet pipe 32 communicates with the outlet end opening 13. The outer end portion of the air outlet pipe 32 is connected to the side of the air duct close to the common duct (not shown); therefore, the airflow pumped to the inside of the casing 1 by the air blower is discharged through the air outlet end opening 13 and the air outlet end unit 3. To the public pipe. The anti-backflow unit 4 is mounted in the accommodating space 11 of the casing 1. The reluctance counter unit includes a frame 41 and a plurality of sheets 42 (in the embodiment, five sheets are displayed). The frame 41 has an inner space 411. A plurality of leaf sheets 42 are disposed on the frame 41 and are located in the inner space 411 thereof; the leaf sheets 42 are arranged one above the other and are crushed and overlapped, and can be opened only one direction toward the air outlet end opening 13 of the casing 1. . In practice, the frame 21 has an upper side plate 412 and a lower side plate 413, and a left side plate 414 and a right side plate 415. Each of the sheets 42 of the plurality of sheets has a leaflet 421 and a shaft portion 422. The flap body 421 has an upper side portion 423 and a lower side portion 424. The shaft portion 422 is disposed on the upper side portion 423, and both ends of the shaft portion 422 protrude from the flap body 421 and are respectively pivotally disposed on the left side plate 414 and the right side plate 415. Therefore, the leaflet can be opened and closed by rotating the pumping portion 422. The advantage of the plurality of sheets 42 is that the area of each leaflet can be relatively reduced, so that a small amount of airflow can be rotated to open and close, and the action sensitivity is higher. Further, the leaflet body 421 has an opposite air inlet end surface 425 and an air outlet end surface 426 which respectively face the inlet end opening of the housing! (4) the air outlet end 201017076 opening 13; and the lower side of the leaflet body 42丨The portion 424 is formed with an outer flap 424a' which is re-raised to cover the outlet end surface 426 of the upper side portion 423 of the adjacent next sheet. Thus, the flaps 42 can only be opened toward the outlet end opening 13 of the housing 1. 'It is not possible to open in the direction of the intake opening 丨2. According to this configuration, in the normal state, the leaflets 42 are naturally sag and layered together, thus closing the accommodating air U of the casing 1, blocking the Between public pipes The odorous airflow invades the bathroom; while the ventilator of the bathroom is operated, its φ airflow can turn the leaflet toward the outlet end opening 13 and allow the airflow to be vented to the common pipe through the ventilation duct. The outlet end surface 426 of the upper side portion 423 of the 421 forms an outer inclined surface 427', and the intake end surface 425 of the outer folding flap 424a of the lower side portion 424 forms an inner inclined surface 428, so that when the leaflet 42 is rotated, The flaps 42 of the upper and lower sheets are not locked to each other, and the movement thereof is smooth. Further, the inner space 411 of the frame 41 of the backflow prevention unit 4 is provided at a position toward the inlet end opening 12 of the casing 1. The frame 416 is configured to block the gap airflow around the entire periphery of the living sheet 4 4 to enhance the anti-backflow effect. Further, a leakage preventing pad 417 is disposed on the periphery of the frame block 41 of the anti-backflow unit 4, and the anti-backflow unit 4 is received. When the accommodating space of the casing i is 丨丨, the adhesion therebetween is maintained. The components of the counter-current blocking unit 4 are assembled into a unit body (ie, the reciprocating flow unit), and when the component is damaged, As long as The reverse resistance unit 4 can be replaced, and the installation and maintenance thereof are extremely convenient. According to the anti-backflow device of the ventilation duct of the bathroom of the present invention, the anti-backflow unit 4 is arranged up and down and partially weighted 4 and directed toward the outlet end. 201017076 The opening of the majority of the leaflet 42 allows the bathroom gas to pass to the public pipe, but blocks the stench gas between the public pipes to flow back into the bathroom. The Ministry of Health maintains the sanitation and health of the tenants. The leaflet 42 is assembled with the frame 41 as a backflow prevention unit 4, which can be easily attached and detached to the accommodating space U of the casing 1, so that the installation and subsequent maintenance are extremely convenient. Please refer to FIG. 4 and FIG. 5 , which illustrate the structure of a second embodiment of the anti-backflow device of the ventilating duct of the present invention, wherein FIG. 4 is an exploded view of the second embodiment. Figure 5 is a cross-sectional view showing the combination. The structure of the second embodiment of the present invention is further configured to provide a first spacer frame in the accommodating space u of the housing 1 in the structure of the first embodiment. s position. The purpose of providing the first spacer frame 5 is to separate a space from the other objects in the flap 42 of the backflow prevention unit 4 when it is rotated open toward the outlet end opening 13. Please refer to FIG. 6 and FIG. 8 , which illustrate the structure of a third embodiment of the anti-backflow device of the bathroom ventilation duct of the present invention, wherein FIG. 6 is an exploded view of the third embodiment, FIG. 7 . It is a sectional view showing the combination, and FIG. 8 is a schematic view showing the combined appearance. The structure of the second embodiment of the present invention is further configured to provide a fan unit 6 in the accommodating space u of the housing 1 at a position facing the intake end opening 12 in the accommodating space u of the housing 1 . . By means of the fan unit 6, the ventilation capacity of the original exhaust fan of the bathroom can be enhanced. The fan unit is also used in the case of a bathroom that has not been installed with a blower or the blower is damaged. 2010 17076 . Can replace the function of the original exhaust fan. That is, according to the structure of the third embodiment, it has the functions of resisting backflow and drawing air at the same time. Similarly, the accommodating space U of the housing 1 is provided with a second spacer frame 7 located at a position of the fan unit 6 facing the air outlet end opening 13 of the housing 1 to partition the space 'avoiding the fan unit 6 and the anti-backflow unit 4 The interaction between the fan blades of the fan unit 6 and the leaflet 42 of the anti-backflow unit 4 affects each other. The present invention has been described in detail with reference to the preferred embodiments of the present invention, but the description of the present invention is only a preferred embodiment of the present invention. The simple equivalent changes and modifications made by the patent application scope and the description of the invention are still within the scope of the patent of the present invention. [Simplified description of the drawings] FIG. 1 is a resisting flow device for robbing the ventilation duct of the bathroom of the present invention. The exploded view of the first embodiment is a sectional view showing the combination of the first embodiment. φ Fig. 3 is an exploded view showing the reverse flow blocking unit of the first embodiment. Fig. 4 is an exploded view showing a second embodiment of the backflow prevention device for the ventilation duct of the bathroom of the present invention. Fig. 5 is not a sectional view of the second embodiment. Fig. 6 is an exploded view showing a third embodiment of the backflow prevention device of the ventilation duct of the bathroom of the present invention. Fig. 7 is a sectional view showing the combination of the third embodiment. Figure 8 is a schematic view showing the combined appearance of the third embodiment. 13 201017076 . [Description of main components] 1. Housing 11. Housing space 1. 2. Inlet opening 1 3. Outlet opening 2. Intake unit 21. Intake end plate 22. Intake tube © 3. Outlet end unit 31. Outlet end plate body 32. Outlet pipe 4. Resistive counterflow unit 41. Frame body 411. Inner wall space 412. Upper side plate 413. Lower side plate® 414. Left side plate 41 5. Right side plate 416. Frame 417. Leak-proof gasket 42. Leaflet 421. Leaflet body 422. Shaft portion 423. Upper side portion 14 201017076 . 4 2 4. Lower side portion 424a. Outer covering portion 425. Intake end surface 426. Outlet end surface 427. Outer bevel 428. Inner bevel 5. First spacer 6. Fan unit _ 7. Second interval frame
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