,201139858 六、發明說明： 【發明所属之技術領域】 本發明係關於一種泵浦葉輪’尤指一種離心式系浦葉 輪。 【先前技術】 參見圖8所示，一般的離心式泵浦90是將葉輪91設 於泵殼92内，並由馬達93傳動主轴94以帶動該葉輪91 旋轉。 進一步參見圖9及10所示’現有技術之葉輪91上成 形有一個軸向的中心通道911、複數個徑向的出口通道 912、以及複數個分隔出口通道912的葉片91 3。其中由於 各葉片913的寬度由内而外尺寸都是相同，而葉輪91的圓 周則是由内而外尺寸漸增，所以會使各出口通道912的寬 度由内而外尺寸漸增。當葉輪91旋轉時，液體會自中心通 道911吸入’再因離心作用由各出口通道912流出，且液 體愈接近出口通道912之外端時其流速會漸增《依據流量 不變法則’流體管路上任意點的截面積與通過該截面的流 速兩者的乘積為定值，因此當液體愈接近出口通道912之 外端時’由於其流速漸增，所以需要的截面積會漸縮。然 而，由於葉輪91之各出口通道912的寬度是由内而外尺寸 漸增的設計’所以出口通道912的截面積是漸增的，如此 將造成液體流動時，出口通道91 2内各點的流動不均，因 而在出口通道91 2内產生撓流，對泵浦90的效率產生不良 的影響，所以有進一步改善的需要。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump impeller, and more particularly to a centrifugal mooring wheel. [Prior Art] Referring to Fig. 8, a general centrifugal pump 90 is provided with an impeller 91 in a pump casing 92, and a motor 93 drives a main shaft 94 to drive the impeller 91 to rotate. Referring further to Figures 9 and 10, the prior art impeller 91 is formed with an axial central passage 911, a plurality of radial outlet passages 912, and a plurality of vanes 91 3 separating the outlet passages 912. Since the widths of the blades 913 are the same from the inside and the outside, and the circumference of the impeller 91 is gradually increased from the inside to the outside, the width of each of the outlet passages 912 is gradually increased from the inside to the outside. When the impeller 91 rotates, the liquid will be sucked from the center passage 911 and then flow out from the respective outlet passages 912 by centrifugation, and the flow rate will gradually increase as the liquid approaches the outer end of the outlet passage 912. The product of the cross-sectional area at any point on the road and the flow rate through the cross-section is constant, so that as the liquid gets closer to the outer end of the outlet passage 912, the cross-sectional area required will be tapered due to the increasing flow rate. However, since the width of each of the outlet passages 912 of the impeller 91 is of increasing design from the inside to the outside, the cross-sectional area of the outlet passage 912 is gradually increased, thus causing liquid flow, and points in the outlet passage 91 2 The flow is uneven, and thus a turbulent flow is generated in the outlet passage 91 2, which adversely affects the efficiency of the pump 90, so there is a need for further improvement.
S 3 201139858 【發明内容】 有鑑於前述現有技術之泵浦葉輪所存在的問題，本發 明提供一種可消除撓流並可提升泵浦效率的泵浦葉輪。 為了達到上述的發明目的，本發明所利用的技術手段 係使一泵浦葉輪包括： 一第一葉輪體，該第一葉輪體具有一環形第一基壁及 複數個第一分隔凸塊，該第一基壁的中央有一穿孔，各第 一分隔凸塊排列為渦旋狀且間隔分佈成形於第一基壁之内 側面，各第一分隔凸塊的寬度由内而外尺寸漸增，且兩相 鄰第一分隔凸塊之間的間距由内而外漸縮； 一第二葉輪體，該第二葉輪體與第一葉輪體相互固 接，該第二葉輪體具有一第二基壁及複數個第二分隔凸 塊，該第二基壁與第一葉輪體的第一基壁相間隔且平行， 第二基壁中心突伸成形有一軸接部，該第二分隔凸塊成形 於第二基壁之内側面，又，各第二分隔凸塊與各第一分隔 凸塊間分別配合界定出複數個出口通道，各出口通道的裁 面由内而外漸縮，每一出口通道具有一朝外的開口。 上述第一葉輪體之各第二分隔凸塊可分別與前述第一 葉輪體之各第一分隔凸塊相對應抵靠並相互連接，兩相鄰 第一分隔凸塊與分別與其連接的兩相鄰第二分隔凸塊相配 合界定出上述出口通道。 上述第一葉輪體之第一分隔凸塊亦可設於前述第一葉 輪體之兩相鄰的第一分隔凸塊之間，使該第一、第二分隔 凸塊呈交錯設置’而上述出口通道則界定於相鄰的第一、 第二分隔凸塊之間。 4 201139858 上述泵浦葉輪可進一步包含一中隔板，該中隔板呈環 形並夾設於上述第一葉輪體與第二葉輪體之間，該中隔板 二側分別抵接上述第一分隔凸塊與第二分隔凸塊。 上述泵浦葉輪可進一步包含一套環，該套環套設於上 述第一葉輪體與第二葉輪體的周緣，該套環成形有複數個 開孔’各開孔分別對應上述各出口通道之開口。 上述套環之各開孔的尺寸可略小於或等於相對應之出 口通道之開口的尺寸。 上述第一葉輪體之各第一分隔凸塊與第一基壁的連接 處可成形有圓弧形倒角，上述第二葉輪體之各第二分隔凸 塊與第二基壁的連接處亦可成形有圓弧形倒角。 上述果浦葉輪可進一步包含複數根螺栓，前述第一葉 輪體與第二葉輪體之間以該螺栓穿設結合固定。 本發明的優點在於，由於各出口通道的截面是由内而 外漸縮，因此可以避免液體在出口通道流動時產生撓流.， 進而達到k昇系·浦效率的目的。 【實施方式】 以下配合圖式及本發明之較佳實施例，進一步闡述本 發明為達成預定發明目的所採取的技術手段。 參見圖1、2及3所示，本發明之泵浦葉輪的第一較佳 實施例包含一第一葉輪體1〇、一第二葉輪體20、一套環4〇 及複數根螺栓60。 第一葉輪體10具有一環形第一基壁11及複數個第— 分隔凸塊12,該第一基壁11的中央有一穿孔^，各第一 分隔凸塊12排列為渦旋狀且間隔分佈成形於第^基壁0 201139858 之内側面，Λ ¢3 _ ^ 一刀隔凸塊12的寬度由内而外尺寸漸增， :兩=第-分隔凸塊12 t間的間距由内而外漸縮，此 : 葉輪體10的第—基壁n的外側面向外突 有一環形凸緣14’環形凸緣14環繞於穿孔川周緣。 見圖3所示，在上述本發明的第一較佳實施例 卜，第-葉輪體W的第一基壁”上成形有十二個第一 分隔凸塊12，但是不以此為限。 第葉輪體20與第一葉輪體相互固接，該第二葉 ^ 〇有一第二基壁21及複數個第二分隔凸塊22，該 第二基壁21與第-葉輪體1〇的第-基壁11相間隔且平 行’第二基壁21中心突伸成形有-軸接部2”，該軸接部 211遠接於 ;馬達之主軸（圖中未示）並受該馬達驅動，該第 二分隔凸I 22成形於第二基壁21之内側面，纟第二分隔 凸塊22分別與各第一分隔凸塊12相對應且相互抵靠，各 第一分隔凸塊22的形狀與相對應之第一分隔凸塊12的形 狀相同且各第二分隔凸塊22連接於相對應之第一分隔凸 塊12,兩相鄰第一分隔凸塊12與分別與其連接的兩相鄰第 二分隔凸塊22相配合界定出一出口通道3〇,各出口通道 3〇的戴面是由内而外漸縮，每一出口通道30具有一朝外的 開口 31。 套％ 40套設於第一葉輪體1〇與第二葉輪體2〇的周 緣’該套環40上成形有複數個開孔41，各開孔々I分別對 應各出口通道30之開口 31。較佳地，該套環4〇之各開孔 41的尺寸可略小於或等於相對應之出口通道3〇的開口 31 的尺寸，以致於出口通道30實際能流出的範圍是套環4〇 •201139858 的開孔41的尺寸’如此，即使第一葉輪體ι〇與第二葉輪 體20的製造尺寸有產生誤差時，也可藉由套環4〇之開孔 41的尺寸來加以調整實際流量。 該第一葉輪體10與第二葉輪體20之間以螺栓6〇穿設 結合固定’本實施例中是以六根螺栓6〇將第一葉輪體’ 〇 與第一葉輪體20相互固定但是不以此為限。 配合參見圖4及5所示，本發明泵浦葉輪之第二較佳 實施例與第一較佳實施例大致相同，其主要差異在於第二 較佳實施例進一步包含一中隔板5〇，該中隔板5〇概呈環 形，且中隔板50夾設於第一葉輪體1〇與第二葉輪體2〇之 間’即中隔板50二側分別抵接所述第一分隔凸塊12與所 述第二分隔凸塊22’另在中隔板5〇上且相對於螺栓6〇穿 設處設有穿孔’以供螺栓6G貫穿，藉此設計，該中隔板5〇 會將出口通道30進一步分隔為二個子通道32,而更可確保 各子通道32中的液體維持層流的方式流動，不會產生轴向 撓流，要說明的是’在中大型葉輪中，轴向撓流較容易形 成所以中隔板50的設計於中大型葉輪中更能彰顯其功 效。由於第二較佳實施例的其餘元件與第一較佳實施例相 同，於此不再重複說明。 進-步參見圖6及7所示的本發明果浦葉輪之第三較 佳實施例，其中’該第一葉輪體1〇A之兩相鄰第一分隔凸 塊1 2A之間的間距，以乃兮访 以及該第二葉輪體20A之兩相鄰第二 分隔凸塊22A之間的間距均 J加大，且該第一、第二葉輪體 1〇A、20A在相對組裝時，俜脾 ^保將該第一、第二分隔凸塊1 2A、 22A 乂錯B又置冑每一第二分隔凸塊位於兩相鄰的第 7 201139858 r 一分隔凸塊12A之間，而該出口通道3〇a則界定於相鄰的 第一、第二分隔凸塊12A、22A之間； 具體的來說’上述本發明泵浦葉輪之第三較佳實施例 的第一葉輪體10A具有六個第一分隔凸塊12a，第二葉輪 體20A具有六個第二分隔凸塊22八，該第一 '第二葉輪體 1 OA、20A結合後形成有十二個出口通道3〇A，但該分隔凸 塊1 2A、22A的數量不以此為限； 相較於前述第一較佳實施例來說，本發明泵浦葉輪的 第二較佳實施例只要在其第一、第二葉輪體彳〇A、2〇A上成 形出較該第一較佳實施例數量減半的第一、第二分隔凸塊 1 2A 22A ’便可界定出與該第一較佳實施例相同數量的出 口通道30A’故上述本發明泵浦葉輪之第三較佳實施例特別 適&用於製&小型的泵浦葉輪，俾使該第一、第二葉輪體 10A、2GA之第-、第二分隔凸塊似、22A間具有足夠寬 的間距以便於銑床的刀具進行銑削加工β 當葉輪旋轉時，液體由第一葉輪體1〇、ι〇α的穿孔 111、11 1Α吸入，再因離心作用由各出口通道3〇、观流 出，由於葉輪的各出口通道30、3〇Α的截面是由内而外漸 縮’所以液體流動時，出口通道3〇、3〇Α内各點的流速是 漸增且以層流方式均勾的流動，如此，在出口通道3〇、繼 内就不會產生撓流的現象，進而可以提升聚浦的效率。S 3 201139858 SUMMARY OF THE INVENTION In view of the problems with the prior art pump impellers, the present invention provides a pump impeller that eliminates turbulence and improves pump efficiency. In order to achieve the above object, the technical means utilized by the present invention is such that a pump impeller includes: a first impeller body having an annular first base wall and a plurality of first partitioning lugs, The first base protrusion has a perforation in the center, and each of the first partitioning protrusions is arranged in a spiral shape and is spaced and formed on the inner side surface of the first base wall, and the width of each of the first partitioning protrusions is gradually increased from the inner and outer dimensions, and a spacing between two adjacent first dividing protrusions is tapered from the inside to the outside; a second impeller body, the second impeller body is fixed to the first impeller body, and the second impeller body has a second base wall And a plurality of second partitioning protrusions, the second base wall is spaced apart from and parallel with the first base wall of the first impeller body, and the second base wall is formed with a shaft joint formed at a center thereof, and the second partitioning lug is formed on the second partitioning wall The inner side surface of the second base wall, and each of the second partitioning protrusions and the first partitioning protrusions respectively define a plurality of outlet passages, and the cutting surfaces of the outlet passages are tapered from the inside to the outside, and each outlet passage It has an opening facing outward. Each of the second partitioning protrusions of the first impeller body may respectively abut and be connected to each of the first partitioning protrusions of the first impeller body, and two adjacent first partitioning protrusions and two phases respectively connected thereto The adjacent second dividing protrusions cooperate to define the above outlet passage. The first partitioning protrusion of the first impeller body may be disposed between two adjacent first partitioning protrusions of the first impeller body, so that the first and second separating protrusions are staggered and the outlet The channel is defined between adjacent first and second spaced apart bumps. 4 201139858 The pump impeller may further include a middle partition, the middle partition is annular and interposed between the first impeller body and the second impeller body, and the two sides of the partition plate respectively abut the first partition a bump and a second split bump. The pump impeller may further include a ring sleeve sleeved on a circumference of the first impeller body and the second impeller body, the collar being formed with a plurality of openings, each of which corresponds to each of the outlet passages Opening. The size of each of the openings of the collar may be slightly less than or equal to the size of the opening of the corresponding outlet passage. a joint of each of the first partitioning protrusions of the first impeller body and the first base wall may be formed with a circular arc chamfer, and a joint of each of the second separating protrusions of the second impeller body and the second base wall is also It can be formed with a circular chamfer. The above-mentioned fruit pump impeller may further include a plurality of bolts, and the bolt body is coupled and fixed between the first impeller body and the second impeller body. The invention has the advantages that since the cross section of each outlet passage is tapered from the inside to the outside, it is possible to avoid the occurrence of the turbulent flow when the liquid flows in the outlet passage, thereby achieving the purpose of the k-liter system. [Embodiment] Hereinafter, the technical means adopted by the present invention for achieving the intended purpose of the invention will be further described in conjunction with the drawings and preferred embodiments of the present invention. Referring to Figures 1, 2 and 3, a first preferred embodiment of the pump impeller of the present invention comprises a first impeller body 1", a second impeller body 20, a set of rings 4" and a plurality of bolts 60. The first impeller body 10 has an annular first base wall 11 and a plurality of first partitioning projections 12. The first base wall 11 has a through hole in the center thereof, and each of the first partitioning projections 12 is arranged in a spiral shape and spaced apart. Formed on the inner side of the base wall 0 201139858, the width of the Λ ¢ 3 _ ^ one-blade spacer 12 is gradually increased from the inside to the outside, and the distance between the two = first-divided projections 12 t is gradually changed from the inside to the outside. Shrinking, this: The outer side of the first base wall n of the impeller body 10 protrudes outwardly with an annular flange 14' around which the annular flange 14 surrounds the perforated circumference. As shown in FIG. 3, in the first preferred embodiment of the present invention, twelve first partitioning lugs 12 are formed on the first base wall of the first impeller body W, but are not limited thereto. The first impeller body 20 and the first impeller body are fixed to each other, and the second blade has a second base wall 21 and a plurality of second partitioning lugs 22, and the second base wall 21 and the first impeller body 1 - the base walls 11 are spaced apart and parallel 'the second base wall 21 is centrally formed with a --axis joint 2" which is remotely connected to and driven by the motor spindle (not shown), The second partitioning protrusions I 22 are formed on the inner side surface of the second base wall 21, and the second partitioning protrusions 22 respectively correspond to the first partitioning protrusions 12 and abut each other, and the shapes of the first partitioning protrusions 22 are respectively The shape of the first partitioning bump 12 is the same and the second partitioning bumps 22 are connected to the corresponding first partitioning bumps 12, and the two adjacent first partitioning bumps 12 are adjacent to the two adjacent connecting bumps 12 respectively. The second dividing protrusions 22 cooperate to define an outlet channel 3〇, and the wearing surfaces of the outlet channels 3〇 are tapered from the inside to the outside, and each outlet channel 30 has one Outer opening 31. The sleeve 40 is disposed on the periphery of the first impeller body 1〇 and the second impeller body 2'. The collar 40 is formed with a plurality of openings 41, and the openings 々I correspond to the openings 31 of the respective outlet passages 30, respectively. Preferably, the size of each opening 41 of the collar 4 is slightly smaller than or equal to the size of the opening 31 of the corresponding outlet passage 3〇, so that the range in which the outlet passage 30 can actually flow out is the collar. The size of the opening 41 of 201139858 is such that even if there is an error in the manufacturing dimensions of the first impeller body ι and the second impeller body 20, the actual flow rate can be adjusted by the size of the opening 41 of the collar 4〇. . The first impeller body 10 and the second impeller body 20 are connected and fixed by bolts 6 '. In the present embodiment, the first impeller body 〇 and the first impeller body 20 are fixed to each other by six bolts 6 但是 but not This is limited to this. Referring to Figures 4 and 5, the second preferred embodiment of the pump impeller of the present invention is substantially identical to the first preferred embodiment. The main difference is that the second preferred embodiment further includes a middle partition 5〇. The middle partition plate 5 is substantially annular, and the middle partition plate 50 is interposed between the first impeller body 1〇 and the second impeller body 2〇, that is, the two sides of the intermediate partition plate 50 respectively abut the first partitioning convex The block 12 and the second partitioning lug 22' are further provided on the middle partition plate 5 and are provided with a through hole 'with respect to the bolt 6 以 for the bolt 6G to pass through, thereby designing the middle partition plate 5 The outlet passage 30 is further divided into two sub-channels 32, and the liquid in each sub-channel 32 is further ensured to maintain a laminar flow without axial axial flow. It is illustrated that in the medium-large impeller, the shaft The deflection flow is easier to form, so the design of the intermediate partition 50 is more effective in the medium and large impellers. Since the remaining elements of the second preferred embodiment are the same as those of the first preferred embodiment, the description will not be repeated here. Referring further to the third preferred embodiment of the fruiting impeller of the present invention shown in Figures 6 and 7, wherein the spacing between the two adjacent first dividing projections 1 2A of the first impeller body 1A, The interval between the two adjacent second partitioning projections 22A of the second impeller body 20A is increased, and the first and second impeller bodies 1A, 20A are assembled in the opposite direction. The spleen protects the first and second partitioning blocks 1 2A, 22A, and B, and each of the second dividing protrusions is located between two adjacent 7th 201139858 r-separating bumps 12A, and the outlet The passage 3〇a is defined between the adjacent first and second partitioning lugs 12A, 22A; specifically, the first impeller body 10A of the third preferred embodiment of the pump impeller of the present invention has six a first dividing protrusion 12a, the second impeller body 20A has six second dividing protrusions 22, and the first 'second impeller body 1 OA, 20A is combined to form twelve outlet channels 3〇A, but The number of the partitioning lugs 1 2A, 22A is not limited thereto; compared with the foregoing first preferred embodiment, the second preferred embodiment of the pump impeller of the present invention is only Forming the first and second partitioning bumps 1 2A 22A ' on the first and second impeller bodies 、A, 2A to be halved by the number of the first preferred embodiment can define A preferred embodiment of the same number of outlet passages 30A', the third preferred embodiment of the pump impeller of the present invention described above is particularly suitable for & small pump impellers, such that the first and second impellers The first and second spacers of the body 10A, 2GA have a sufficiently wide spacing between the 22A to facilitate milling of the tool of the milling machine. When the impeller rotates, the liquid is perforated by the first impeller body 1〇, ι〇α. 111, 11 1 Α inhalation, and then flow out from each outlet channel by centrifugation, since the cross section of each outlet passage 30, 3〇Α of the impeller is tapered from the inside to the outside, so when the liquid flows, the outlet passage 3〇 The flow velocity at each point in the 3 是 is increasing and flowing in a laminar flow manner. Thus, there is no phenomenon of snagging flow in the outlet channel 3 〇 and then, and the efficiency of the concentrating can be improved.
此外，第—葉輪體1G、1GA的第—基壁η、ΐΜ與第 一葉輪體20' 20Α的第二基壁21、2Μ是彼此平行的，所 以第-基壁”、m與第二基壁21、21Α之間距是相等的， 因此液體於出口通道3〇、3〇Α内流動時對第一基壁"'"A 8 .201139858 與第一基壁21、21A產生之阻力極小；再者，第—葉輪體 1〇、1〇A之各第一分隔凸塊12、12A與第一基壁川、11A 的連接處成形有圓弧形倒角13、13A，第二葉輪體2〇 2〇a 之各第二分隔凸塊22、22A與第二基壁21、21A的連接處 亦成形有圓弧形倒角23、23A，更可減少液體流動時的阻 力；特別要說明的是，第一葉輪體1〇、1〇A與第二葉輪體 20 2〇A疋採用電腦數值控制（c〇mpUter Numerical Control ’ CNC)銑床加工而成，故可使出口通道3〇、3〇a 的内壁面光滑、尺寸正確，從而減小液體流動時的阻力。 綜上所述’由於葉輪的各出口通道3〇、3〇a的截面是 由内而外漸縮，所以液體流動時，出口通道3〇、3〇A内各 點的流速是漸增的且流動是均勻的，即以層流的方式流 動，如此，在出口通道30、3〇A内不會產生撓流的現象’ 且不會產生氣触現象，亦不會產生振動現象，進而可以提 升豕潘的效率。 以上所述僅是本發明的較佳實施例而已，並非對本發 明作任何形式上的限制，雖然本發明已以較佳實施例揭露 如上，然而並非用以限定本發明，任何所屬技術領域中具 有通常知識者，在不脫離本發明技術方案的範圍内當可 利用上述揭示的技術内容作出些許更動或修飾為等同變化 的等效實施例，但凡是未脫離本發明技術方案的内容，依 據本發明的技術實質對以上實施例所作的任何簡單修改、 等同變化與修飾，均仍屬於本發明技術方案的範圍内。 【圖式簡單說明】 圖1為本發明之第一較佳實施例的立體外觀圖。g 9 201139858 圖2為本發明之第—較佳實 住貫靶例的立體分解圖。 圖3為本發明之第一較佳實施 圖 Y第葉輪體的俯視 圖4為本發明之第二較佳實 貰施例的立體外觀圖。 圖5為本發明之第二較佳音 权佳貫鉍例的立體分解圖。 圖6為本發明之第三較佳眘竑 平乂住貫靶例的立體外觀圖。 圖7為本發明之第三較佳實施例的立體分解圖。 圖8為現有技術之離心式泵浦的剖視圖。 圖9為現有技術之葉輪的剖視圖。 圖10為現有技術之葉輪的俯視圖。 【主要元件符號說明】 10 ' 10A第一葉輪體 111、111A 穿孔 1 3、1 3A倒角 20、20A第二葉輪體 21 1轴接部 23、23A倒角 31開口 40套環 50中隔板 11、 11A第一基壁 12、 12A第一分隔凸塊 14凸緣 21、 21A第二基壁 22、 22A第二分隔凸塊 3〇、30A出口通道 32子通道 41開孔 60螺栓 10Further, the first base wall η, ΐΜ of the first impeller body 1G, 1GA and the second base wall 21, 2Μ of the first impeller body 20' 20Α are parallel to each other, so the first base wall”, m and the second base The distance between the walls 21, 21 is equal, so the resistance of the first base wall "'"A 8 .201139858 to the first base wall 21, 21A is minimal when the liquid flows in the outlet passages 3〇, 3〇Α. Further, the first partitioning projections 12, 12A of the first impeller body 1〇, 1〇A and the first base wall and the 11A are formed with arc-shaped chamfers 13, 13A, and the second impeller body The joints of the second partitioning lugs 22, 22A and the second base walls 21, 21A of the 2〇2〇a are also formed with arc-shaped chamfers 23, 23A, which can reduce the resistance when the liquid flows; The first impeller body 1〇, 1〇A and the second impeller body 20 2〇A疋 are processed by a computer numerical control (c〇mpUter Numerical Control 'CNC) milling machine, so that the outlet passages 3〇, 3 can be made. The inner wall of 〇a is smooth and the size is correct, so as to reduce the resistance when the liquid flows. In summary, the section of the outlet passages 3〇, 3〇a of the impeller is From the inside to the outside, the flow velocity of each point in the outlet passages 3〇, 3〇A is increasing and the flow is uniform, that is, flowing in a laminar flow, so that in the outlet passage 30, 3〇A does not cause a phenomenon of snagging flow', and no gas contact phenomenon occurs, and vibration phenomenon does not occur, thereby improving the efficiency of 豕pan. The above description is only a preferred embodiment of the present invention, and not The present invention is not limited to the scope of the present invention, and is not intended to limit the present invention, and any one of ordinary skill in the art may be within the scope of the technical solutions of the present invention. The equivalents of the above-described embodiments may be modified or modified to equivalent variations, and any simple modifications and equivalent changes to the above embodiments may be made in accordance with the technical spirit of the present invention without departing from the technical scope of the present invention. And the modifications are still within the scope of the technical solution of the present invention. [Schematic Description of the Drawings] FIG. 1 is a perspective appearance of a first preferred embodiment of the present invention. Figure 9 is a perspective exploded view of a first preferred embodiment of the present invention. Figure 3 is a plan view of the first impeller body of the first preferred embodiment of the present invention. Figure 4 is a second comparison of the present invention. Fig. 5 is a perspective exploded view of a second preferred embodiment of the present invention. Fig. 6 is a perspective view of a third preferred embodiment of the present invention. Figure 7 is a perspective view of a third preferred embodiment of the present invention. Figure 8 is a cross-sectional view of a prior art centrifugal pump. Figure 9 is a cross-sectional view of a prior art impeller. Figure 10 is a prior art impeller. Top view. [Main component symbol description] 10 '10A first impeller body 111, 111A perforation 1 3, 1 3A chamfer 20, 20A second impeller body 21 1 shaft joint 23, 23A chamfer 31 opening 40 collar 50 Middle partition 11, 11A first base wall 12, 12A first partitioning projection 14 flange 21, 21A second base wall 22, 22A second partitioning projection 3〇, 30A outlet passage 32 sub-channel 41 opening 60 bolt 10