200813334 d . 九、發明說明： • 【發明所屬之技術領域】 • 本發明係有關離心風扇的結構，尤其是指一種葉輪邊 緣與風扇殼體間形成等間距的氣體流道與上下不對稱之流 道空間之風扇殼體設計，使離心風扇具有低噪音與高流量 之特點，進而利用該離心風扇形成可吸塵與集塵的模組。 •【先前技術】 自動吸塵器為一全自動之清潔裝置，有別於傳統的吸 塵器以及掃除工具，可自行在一固定之區域内完成清潔工 作，以取代傳統人工操作之吸塵器及其他的清潔工具。自 動吸塵器在設定清掃模式以後，便自動進行地面清掃之功 能，並且可以閃避室内之家具或者是障礙物以完成清潔之 工作，此外自動吸塵器更可以清理一般難以清掃之死角。 雖然自動吸塵器可對於未來之家庭生活可以帶來便 φ 利，然而這種自走式的自動吸塵器由於其所需之電源並非 來自交流電，並且由於内部空間的限制，並無法選擇如傳 統式吸塵器所使用的空氣壓縮機，因此在有限的電源供應 下，惟有良好的離心風扇才能展現其優異之性能。此外， 離心風扇相較於傳統之空氣壓縮機具有低噪音之優點。 為了讓離心風扇可以運作的更流暢，現今所考量之設 " 計重點在於如何設計低噪音、壓差大以及大流量之特性。 在習用技術中，如中華民國專利公告號M24 64 71號所揭露 的為^一離心風扇結構以及使用該結構之吸塵器。不過該技 200813334 術之缺點在於，其離心風扇之外殼並無特殊設計，並且氣 流之流道並無一適當之導流口，因此容易產生噪音。另外 又如，歐洲專利EP0943808所揭露之技術，其風扇之外殼 所具有之氣體流道為一螺旋漸開線，而其舌端（casing tongue)具有一曲率，以隔離進氣端以及出氣端之氣流，增 加離心風扇之效率，避免亂流產生。 而利用離心風扇之收集灰塵的盒體，在習用技術中並 無法與離心風扇之優點達取得一平衡點，例如，往往需要 顧慮到灰塵清理以及取放之便利，而犧牲了進氣流道之平 . · . . * . 順性。 綜合上述，因此亟需一種離心風扇以及使用該離心風 扇之集塵盒模組來改善習用技術所產生之問題。 【發明内容】 本發明的主要目的是提供一種離心風扇以及使用該離 心風扇之集塵盒模組，其係利用具有等寬度之氣體流道與 上下不對稱之流道空間之風扇殼體設計，達到使離心風扇 具有低噪音與高流量之目的。 本發明的次要目的是提供一種離心風扇以及使用該離 心風扇之集塵盒模組，其係利用集塵盒體之特殊設計，與 離心風扇組合成及塵盒模組，達到集塵以及氣流平順之目 的。 為了達到上述之目的，本發明提供一種離心風扇，其 係包含有：一殼體，其係具有一容置空間，該殼體更具有 200813334 一進氣口以及一出氣口；一葉輪，其係設置於該容置空間 内，該葉輪之邊緣與該殼體侧壁間形成具有相等流道寬度 之一氣體流道；以及一驅動裝置，其係與該葉輪相連接以 驅動該葉輪轉動。 較佳的是，該葉輪之轴向中心截面線將該容置空間分 成一第一空間與一第二空間，該第一空間與該第二空間係 不對稱。其中該第二空間更延伸有一螺旋流道與該出氣口 相連通。該螺旋流道之截面積由該螺旋流道之入口到該出 氣口而逐漸增加。 較佳的是，該殼體更包括有：一上殼體，其係具有該 進氣口；以及一下殼體，其係與該上殼體相連接，該下殼 體更具有該出氣口。 較佳的是，該葉輪係可選擇為單列翼形葉片以及雙列 翼形葉片其中之一者。 為的達到上述之目的，本發明更提供一種離心風扇， 其係包含有：一殼體，其係具有一容置空間，該殼體更具 有一進氣口以及一出氣口；一葉輪，其係設置於該容置空 間内，該葉輪之軸向中心戴面線將該容置空間分成一第一 空間與一第二空間，該第一空間與該第二空間係不對稱； 以及一驅動裝置，其係與該葉輪相連接以驅動該葉輪轉動。 為了達到上述之目的，本發明更提供一種集塵盒模 組，其係包含有:一罩體，其係具有一凹槽，該罩體之一 侧上開設有與該凹槽連通之一槽孔，該罩體更具有與該凹 槽相連通之一通孔；一吸塵罩，其係與該槽孔相連接；一 盒體，其係設置於該凹槽内，該盒體具有與該通孔以及該 200813334 / 槽孔相連通之一集塵空間；以及一離心風扇，其係設置於 ‘ 該罩體上，該離心風扇更具有：一殼體，殼體，其係具有 . 一容置空間，該殼體更具有一進氣口以及一出氣口，該進 氣口係與該通孔相連通；一葉輪，其係設置於該容置空間 内，該葉輪之邊緣與該殼體侧壁間形成具有相等流道寬度 之一氣體流道；以及一驅動裝置，其係與該葉輪相連接以 驅動該葉輪轉動。 較佳的是，該離心風扇與該通孔間更具有一濾網。 較佳的是，該吸塵罩更具有一滾輪；該滾輪上更具有 刷毛。 較佳的是，該凹槽兩壁上更具有滑槽，該盒體之兩側 上更具有可與該滑槽相滑靠之凸部，使該盒體可於該凹槽 上滑動。 為的達到上述之目的，本發明更提供一種集塵盒模 組，其係包含有：一罩體，其係具有一凹槽，該罩體之一 0 側上開設有與該凹槽連通之一槽孔，該罩體更具有與該凹 槽相連通之一通孔；一吸塵罩，其係與該槽孔相連接；一 盒體，其係設置於該凹槽内，該盒體具有與該通孔以及該 槽孔相連通之一集塵空間；以及一離心風扇，其係設置於 該罩體上，該離心風扇更具有：一殼體，其係具有一容置 ^ 空間，該殼體更具有與該通孔相連通之一進氣口以及一出 一 氣口；一葉輪，其係設置於該容置空間内，該葉輪之軸向 中心截面線將該容置空間分成一第一空間與一第二空間， 該第一空間與該第二空間係不對稱；以及一驅動裝置，其 係與該葉輪相連接以驅動該葉輪轉動。 9 200813334 【實施方式】 击為使貴審查委員能對本發明之特徵、目的及功能有 邱^接乂的⑽知與瞭解’下文特將本發明之系統的相關細 U冓以及設計的理念原由進行說明，以使得審查委員可 以了解本發明之特點，詳細說明陳述如下： 請參閱圖-A以及圖—β所示，其中為本發 月^離心風扇較佳實施例立體分解示意圖；圖—B係為本 =之離心風扇較佳實施例組合示意圖。該風扇裝置1包 =1體Γ—葉輪11以及一驅動裝置14 17 ΐ 1與一下殼體102所構成。有別於傳統之 1疋漸開線所形成之殼體，該上殼體1G1與下殼體102组 置空軸方向截面形狀為圓形而非習用技術之截 面形狀。该上忒體101之中心位置上方且一 101卜該下殼體102·之-側邊上具有一出氣口 1〇2卜水 有-其係設置於該容置空間内。該葉輪11係具 ΐ:ίΓι，上底r 數们茱片113上方設置有—頂板⑴。該複 =tn二上之排列方式可㈣ ：^!ff A , n 「有早列權列之葉片113。而如圖 示荦輪 雙列環形排列之葉謂a、U3b之排列。細 接:^ ^ 動裝置14係藉由一定位们2與一轉 ㈣讀11相連接，以提供轉軸力給該葉輪u。 接下來說明該葉輪11於該殼體10内之配置位置。請 200813334 % * ' . 參閱圖三A所示，該圖係為本發明之離心風扇俯視示意 ， 圖。從圖中可以了解，由於該殼體10内之容置空間其軸向 . 截面為圓形，因此該葉輪11之邊緣與該殼體10侧壁間形 成具有相等流道寬度D之一氣體流道103。請參閱圖三B 所示，該圖係為本發明之離心風扇侧視剖面示意圖。該葉 輪本體之軸向中心截面線8上方與該殼體10内壁形成一第 一空間A1，而該葉輪之軸向中心截面線8下方與該殼體10 内壁形成一第二空間A2。有別於習用技術，本發明之特徵 _ 在於該第二空間A2與該第一空間A1不對稱。如圖一 B以 及圖三B所示，在該下殼體102於該第二空間A2上具有一 螺旋流道1022。該螺旋流道1022之截面積由該螺旋流道 1022之入口到該出氣口 1021而逐漸增加。以圖三B中之 1022a表示該螺旋流道1022之一截面，而1022b表示該螵 旋流道1022之另一截面，從圖中可知1022a之面積大於 1022b之面積。 由於本發明之殼體設計，使得本發明之殼體並無明顯 _ 之舌端（cas i ng tongue)，因此大部分的氣流會經由葉輪 11下半部流道由出口排出，以至於進氣與出氣之間並不會 因為回流而產生氣流噪音。請參閱圖四所示，該圖係為本 發明之離心風扇與其他習用技術之風扇的流量-壓力曲線 ' 比較曲線圖。其中曲線90為本發明之設計，編號為MSL II、 . 曲線91為中華民國專利M246471 (RV-10)之離心風扇、 曲線92為歐洲專利EP0943808 ( Karcher)，另外曲線93 代表產品I -robot離心風扇性能曲線。由離心風扇之性能 曲線測試可以得知，在相同之操作點上，本發明之性能曲 200813334 線90優於曲線91、92、93，而整體噪音亦與歐洲專利 EP0943808 (Karcher)同級而超過中華民國專利M246471 (RV-10)之離心風扇10(18以上。如此可使得吸塵器整體 之吸力可達到優越的水準並保持低噪音的運轉。 由於前述之離心風扇具有壓差大、高流量之優點，因 此本發明利用該離心風扇而提供一集塵盒模組。請參閱圖 五所示，該圖係為本發明之集塵盒模組之較佳實施例組合 示意圖。該集塵盒模組2包括有一離心風扇20與一集塵盒 21。該離心風扇之結構係如前所述。請參閱圖六A以及圖 六B所示，該圖係為本發明集塵盒較佳實施例示意圖。該 ,集塵盒21更包括一罩體210、一吸塵罩212以及一盒體 211。該罩體210具有一凹槽2104，該罩體210之一侧上 開設有與該凹槽2104連通之一槽孔2101，該罩體210更 具有與該凹槽2104相連通之一通孔2102，該通孔2102係 與該離心風扇21之進氣口相連通。該通孔2102與該離心 風扇20間更可設置抽取式之一過濾網。 該盒體211係設置於該凹槽2104内，該盒體211具有 與該通孔2102以及該槽孔2101相連通之一集塵空間 2110。該集塵空間2110可放式一集塵袋（圖中未示），該盒 體211可類似抽屜式的方式容置於該凹槽内，如要更換集 塵袋，則可以將談盒體211抽出，然後更換集塵袋即可。 請參閱圖七所示，該圖係為本發明之吸塵罩較佳實施例示 意圖。該吸塵罩212具有一進氣口 2121以及一出氣口 2120,該出氣口 2120係與該罩體210之槽孔2101相連通。 該吸塵罩212之進氣口 2121端更可以設置一滾輪2122， 12 200813334 滾輪上可以設置刷毛。 在本實施例中爲了要使氣體的流道平順，在吸塵器（圖 中未示）底盤的進氣口與集塵盒21透過該吸塵罩212相連 接，且集塵盒21之罩體210之進氣槽孔2101開口部位在 該罩體210之侧邊，而非底面，如此便可以不用顧慮集塵 之效能而要刻意的去扭曲氣體流道而造成氣流噪音。也因 為如此集塵盒罩體210及盒體211之結構設計成抽屜抽取 之方式，不但可以降低噪音，更可方便灰塵之清理以及濾 網之更換。 唯以上所述者，僅為本發明之較佳實施例，當不能以 之限制本發明範圍。即大凡依本發明申請專利範圍所做之 均等變化及修飾，仍將不失本發明之要義所在，故都應視 為本發明的進一步實施狀況。 綜合上述，本發明提供之離心風扇以及使用該離心風 扇之集塵盒模組，壓差大、高流量以及抑制噪音之優點。 足以滿足業界之需求’進而提南該產業之競爭力’誠已符 合發明專利法所規定申請發明所需具備之要件，故爰依法 呈提發明專利之申請，謹請貴審查委員允撥時間惠予審 視，並賜準專利為禱。 【圖式簡單說明】 圖一 A係為本發明之離心風扇較佳實施例立體分解示意 圖。 ” 圖一 B係為本發明之離心風扇較佳實施例組合示意圖。 13 200813334 圖二A、B係為本發明之離心風扇葉輪俯視示意圖。 圖三A係為本發明之離心風扇俯視示意圖。 圖三B係為本發明之離心風扇侧視剖面不意圖。 圖四係為本發明之離心風扇與其他習用技術之風扇的流量 -壓力曲線比較曲線圖。 圖五係為本發明之集塵盒模組之較佳實施例組合示意圖。 圖六A係為本發明集塵盒之較佳實施例組合示意圖。 圖六B係為本發明集塵盒之較佳實施例分解示意圖。 圖七係為本發明之吸塵罩較佳實施例示意圖。 【主要元件符號說明】 1 -離心風扇 10-殼體 101- 上殼體 1011-進氣口 102- 下殼體 ί02卜出氣口 1022-螺旋流道 1022a、1022b-截面 103- 氣體流道 1卜11a-葉輪 110 -底板 1U-頂版 112-進氣端 14 200813334 Π3、113a、113b-葉片 12 -定位銷 13- 轉接板 14- 驅動裝置 2-集塵盒模組 20- 離心風扇 21- 集塵盒 210- 罩體 2101- 槽孔 2102- 通孔 210 3 -固定孔 2104-凹槽 211- 拿體 2110-集塵空間 212- 吸塵罩 2120- 出氣孔 2121- 進氣孔 .2122-滾輪 8-轴向中心截面線 90、91、92、93-曲線 A1-第一空間 A2 -第二空間 D-流道寬度200813334 d. IX. Description of the invention: • Technical field to which the invention pertains. The present invention relates to the structure of a centrifugal fan, and more particularly to a gas flow path and an up and down asymmetrical flow between the edge of the impeller and the fan casing. The fan casing design of the road space makes the centrifugal fan have the characteristics of low noise and high flow rate, and the centrifugal fan is used to form a module capable of collecting and collecting dust. • [Prior Art] The automatic vacuum cleaner is a fully automatic cleaning device that, unlike conventional vacuum cleaners and sweeping tools, can perform cleaning work in a fixed area to replace traditional manual vacuum cleaners and other cleaning tools. The automatic vacuum cleaner automatically performs the ground cleaning function after setting the cleaning mode, and can avoid the furniture or obstacles in the room to complete the cleaning work. In addition, the automatic vacuum cleaner can clean the dead corners that are difficult to clean. Although the automatic vacuum cleaner can bring benefits to the future family life, the self-propelled automatic vacuum cleaner does not have the power supply from the alternating current, and because of the limitation of the internal space, it cannot be selected as a conventional vacuum cleaner. The air compressor is used, so with a limited power supply, only a good centrifugal fan can show its excellent performance. In addition, centrifugal fans have the advantage of low noise compared to conventional air compressors. In order to make the centrifugal fan work more smoothly, the focus of today's design is how to design low noise, large differential pressure and large flow characteristics. In the conventional technology, as disclosed in the Republic of China Patent Publication No. M24 64 71, a centrifugal fan structure and a vacuum cleaner using the same are disclosed. However, the disadvantage of this technique is that the outer casing of the centrifugal fan is not specially designed, and the flow passage of the airflow does not have a proper air inlet, so noise is easily generated. In addition, as disclosed in the European Patent No. EP 0 943 808, the outer casing of the fan has a gas flow path which is a spiral involute, and the casing tongue has a curvature to isolate the inlet end and the outlet end. Airflow increases the efficiency of the centrifugal fan and prevents turbulence. The use of the centrifugal fan to collect dust, in the conventional technology can not achieve a balance with the advantages of the centrifugal fan, for example, often need to worry about the dust cleaning and the convenience of pick and place, and sacrifice the intake runner Ping. · . . * . Compliance. In summary, there is a need for a centrifugal fan and a dust box module using the centrifugal fan to improve the problems associated with conventional techniques. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a centrifugal fan and a dust box module using the same, which utilizes a fan casing design having a gas flow path of equal width and an asymmetrical asymmetric flow path space. To achieve the purpose of making the centrifugal fan have low noise and high flow. A secondary object of the present invention is to provide a centrifugal fan and a dust box module using the same, which are combined with a centrifugal fan and a dust box module to achieve dust collection and airflow. The purpose of smoothness. In order to achieve the above object, the present invention provides a centrifugal fan, comprising: a housing having an accommodating space, the housing further having an air inlet and an air outlet; and an impeller. Disposed in the accommodating space, a gas flow path having a flow path width is formed between the edge of the impeller and the side wall of the casing; and a driving device connected to the impeller to drive the impeller to rotate. Preferably, the axial center section line of the impeller divides the accommodating space into a first space and a second space, and the first space is asymmetric with the second space. The second space further has a spiral flow path communicating with the air outlet. The cross-sectional area of the spiral flow path is gradually increased from the inlet of the spiral flow path to the gas outlet. Preferably, the housing further includes: an upper housing having the air inlet; and a lower housing coupled to the upper housing, the lower housing further having the air outlet. Preferably, the impeller is selectable as one of a single row of wing shaped vanes and a double row of vane shaped vanes. In order to achieve the above object, the present invention further provides a centrifugal fan, comprising: a housing having an accommodating space, the housing further having an air inlet and an air outlet; an impeller; Is disposed in the accommodating space, the axial center wearing line of the impeller divides the accommodating space into a first space and a second space, the first space is asymmetric with the second space; and a driving A device is coupled to the impeller to drive the impeller to rotate. In order to achieve the above object, the present invention further provides a dust box module, comprising: a cover body having a groove, a side of the cover body having a slot communicating with the groove a hole, the cover body further has a through hole communicating with the groove; a dust collecting cover connected to the slot; a box body disposed in the groove, the box body having the same The hole and the 200813334/slot are connected to one of the dust collecting spaces; and a centrifugal fan is disposed on the cover body, the centrifugal fan further has: a casing, a casing, and a casing thereof. Space, the housing further has an air inlet and an air outlet, the air inlet is in communication with the through hole; an impeller is disposed in the receiving space, the edge of the impeller and the housing side A gas flow path having one of the equal flow path widths is formed between the walls; and a driving device coupled to the impeller to drive the impeller to rotate. Preferably, there is a filter screen between the centrifugal fan and the through hole. Preferably, the suction hood further has a roller; the roller further has bristles. Preferably, the two walls of the groove further have a sliding groove, and the two sides of the casing further have a convex portion slidable with the sliding groove, so that the casing can slide on the groove. In order to achieve the above object, the present invention further provides a dust box module, comprising: a cover body having a groove, wherein one side of the cover body is open on the 0 side thereof and is connected to the groove a slot, the cover body further has a through hole communicating with the groove; a dust cover connected to the slot; a box body disposed in the groove, the box having The through hole and the slot are connected to one of the dust collecting spaces; and a centrifugal fan is disposed on the cover body, the centrifugal fan further has: a casing having a receiving space, the shell The body further has an air inlet connected to the through hole and an air outlet; an impeller is disposed in the accommodating space, and the axial center section line of the impeller divides the accommodating space into a first a space and a second space, the first space being asymmetric with the second space; and a driving device coupled to the impeller to drive the impeller to rotate. 9 200813334 [Embodiment] In order to enable the reviewing committee to have the characteristics, objectives, and functions of the present invention, it is necessary to understand (10) the knowledge and understanding of the system of the present invention. In order to enable the reviewing committee to understand the features of the present invention, the detailed description is as follows: Please refer to FIG. A and FIG. -β, which are schematic exploded perspective views of a preferred embodiment of the centrifugal fan; FIG. A schematic diagram of a preferred embodiment of the centrifugal fan of the present invention. The fan unit 1 includes a body Γ impeller 11 and a drive unit 14 17 ΐ 1 and a lower housing 102. Different from the conventional casing formed by the involute, the upper casing 1G1 and the lower casing 102 are arranged in a circular cross-sectional shape in a circular shape instead of the cross-sectional shape of the conventional technique. Above the center of the upper body 101, there is an air outlet 1 - 2 on the side of the lower casing 102 - which is disposed in the accommodating space. The impeller 11 is provided with a 顶: Γ Γ, and the upper plate is provided with a top plate (1) above the cymbal 113. The arrangement of the complex = tn two can be (4): ^! ff A , n "The blade 113 having the early column of the column. The leaf array of the double row of the ring is a and U3b as shown in the figure. ^ ^ The moving device 14 is connected to a rotating (four) reading 11 by a positioning member 2 to provide a rotating shaft force to the impeller u. Next, the position of the impeller 11 in the casing 10 will be described. Please call 200813334 % * Referring to Figure 3A, the figure is a top view of the centrifugal fan of the present invention. It can be understood from the figure that since the housing space in the housing 10 has an axial direction and a circular cross section, the A gas flow path 103 having a flow path width D is formed between the edge of the impeller 11 and the side wall of the casing 10. See Figure 3B, which is a side cross-sectional view of the centrifugal fan of the present invention. A first space A1 is formed above the axial center section line 8 of the body and the inner wall of the casing 10, and a second space A2 is formed below the axial center section line 8 of the impeller and the inner wall of the casing 10. Different from the conventional The invention is characterized in that the second space A2 is asymmetrical to the first space A1. As shown in FIG. 3B, the lower casing 102 has a spiral flow path 1022 on the second space A2. The cross-sectional area of the spiral flow path 1022 is gradually increased from the entrance of the spiral flow path 1022 to the air outlet 1021. The cross section of the spiral flow path 1022 is represented by 1022a in FIG. 3B, and the other cross section of the spiral flow path 1022 is shown by 1022b. It is known from the figure that the area of 1022a is larger than the area of 1022b. The body design makes the casing of the present invention have no obvious cas i ng tongue, so most of the airflow is discharged from the outlet through the lower half of the impeller 11 so that between the intake and the exhaust There will be no airflow noise due to reflow. Please refer to Figure 4, which is a comparison of the flow-pressure curve of the centrifugal fan of the present invention with other conventional fans. Curve 90 is the design of the present invention. No. MSL II, . Curve 91 is the centrifugal fan of the Republic of China patent M246471 (RV-10), curve 92 is the European patent EP0943808 (Karcher), and curve 93 represents the performance curve of the product I-robot centrifugal fan. The energy curve test shows that at the same operating point, the performance curve 200813334 line 90 of the present invention is superior to the curves 91, 92, 93, and the overall noise is also in the same level as the European patent EP0943808 (Karcher) and exceeds the Republic of China patent M246471 ( RV-10) centrifugal fan 10 (18 or more. This makes the overall suction of the vacuum cleaner reach a superior level and maintains low noise operation. Since the centrifugal fan described above has the advantages of large differential pressure and high flow rate, the present invention utilizes The centrifugal fan provides a dust box module. Please refer to FIG. 5, which is a schematic diagram of a preferred embodiment of the dust box module of the present invention. The dust box module 2 includes a centrifugal fan 20 and a dust box 21. The structure of the centrifugal fan is as described above. Please refer to FIG. 6A and FIG. 6B, which are schematic views of a preferred embodiment of the dust box of the present invention. The dust box 21 further includes a cover 210, a dust cover 212, and a casing 211. The cover body 210 has a recess 2104. One side of the cover body 210 is provided with a slot 2101 communicating with the recess 2104. The cover 210 further has a through hole 2102 communicating with the recess 2104. The through hole 2102 is in communication with the intake port of the centrifugal fan 21. One of the removable filters can be disposed between the through hole 2102 and the centrifugal fan 20. The casing 211 is disposed in the recess 2104. The casing 211 has a dust collecting space 2110 communicating with the through hole 2102 and the slot 2101. The dust collecting space 2110 can be placed in a dust collecting bag (not shown), and the box body 211 can be accommodated in the groove like a drawer. If the dust collecting bag is to be replaced, the box can be used. Take out 211 and replace the dust bag. Referring to Figure 7, the figure is a preferred embodiment of the dust hood of the present invention. The dust collecting cover 212 has an air inlet 2121 and an air outlet 2120. The air outlet 2120 communicates with the slot 2101 of the cover 210. The air inlet 2121 end of the dust collecting cover 212 can further be provided with a roller 2122, 12 200813334. The bristles can be arranged on the roller. In the present embodiment, in order to smooth the flow path of the gas, the air inlet of the chassis of the vacuum cleaner (not shown) is connected to the dust box 21 through the dust collecting cover 212, and the cover 210 of the dust box 21 is The opening portion of the air inlet slot 2101 is on the side of the cover 210 instead of the bottom surface, so that the gas flow path can be deliberately twisted without causing the dust collecting effect to cause airflow noise. Also, since the structure of the dust box cover 210 and the casing 211 is designed to be drawerd, the noise can be reduced, and the dust can be cleaned and the filter replaced. The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto. That is, the equivalent changes and modifications made by the present invention in the scope of the present invention will remain without departing from the scope of the present invention, and therefore should be considered as further implementation of the present invention. In summary, the centrifugal fan provided by the present invention and the dust box module using the centrifugal fan have the advantages of large differential pressure, high flow rate, and noise suppression. Sufficient to meet the needs of the industry 'and then promote the competitiveness of the industry'. The company has met the requirements for applying for inventions under the invention patent law. Therefore, it is necessary to submit an application for invention patents according to law. Examine and grant the patent as a prayer. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a perspective exploded view of a preferred embodiment of a centrifugal fan of the present invention. Fig. 1B is a schematic view showing a combination of preferred embodiments of the centrifugal fan of the present invention. 13 200813334 Fig. 2A and B are top views of the centrifugal fan impeller of the present invention. Fig. 3A is a top view of the centrifugal fan of the present invention. The third B is a side view of the centrifugal fan of the present invention. FIG. 4 is a graph comparing the flow-pressure curve of the centrifugal fan of the present invention and other conventional fans. Figure 6A is a schematic view showing a combination of a preferred embodiment of the dust box of the present invention. Figure 6B is an exploded perspective view of a preferred embodiment of the dust box of the present invention. BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION A description of the preferred embodiment of the dust hood of the invention. [Description of main components] 1 - Centrifugal fan 10 - Housing 101 - Upper housing 1011 - Air inlet 102 - Lower housing ί02 Bu air outlet 1022-Spiral flow path 1022a, 1022b-section 103- gas flow path 1b 11a-impeller 110 - bottom plate 1U-top plate 112 - intake end 14 200813334 Π3, 113a, 113b-blade 12 - locating pin 13 - adapter plate 14 - drive unit 2 - set Dust Box Module 20 - Centrifugal Fan 2 1- Dust box 210- Cover body 2101- Slot hole 2102- Through hole 210 3 - Fixing hole 2104- Groove 211- Handle 2110-Dusting space 212- Dust hood 2120- Venting hole 2121- Inlet hole. 2122 -Roller 8 - axial center section line 90, 91, 92, 93 - curve A1 - first space A2 - second space D - flow path width