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渣漿泵比轉(zhuǎn)速在泵的分類(lèi)、相似設(shè)計(jì)和產(chǎn)品系列化方面具有重要用途。
(1)用比轉(zhuǎn)速對(duì)泵進(jìn)行分類(lèi)。離心泵的比轉(zhuǎn)速大小與輸送液體的性質(zhì)無(wú)關(guān)，而與葉輪形狀及泵的特性曲線(xiàn)有密切關(guān)系,可以根據(jù)比轉(zhuǎn)速的大小,將泵分成低比轉(zhuǎn)速、中比轉(zhuǎn)速和高比轉(zhuǎn)速的離心泵，以及比轉(zhuǎn)速更高的混流泵和軸流泵，見(jiàn)表1-7。同時(shí)，表1-7還表示了比轉(zhuǎn)速與葉輪形狀及特性曲線(xiàn)形狀的關(guān)系?？梢钥闯?/span>,低比轉(zhuǎn)速泵主要指高揚(yáng)程、小流量,高比轉(zhuǎn)速則代表低揚(yáng)程、大流量;低比轉(zhuǎn)速泵葉輪外形窄而長(zhǎng).高比轉(zhuǎn)速泵葉輪寬而短;低比轉(zhuǎn)速泵特性曲線(xiàn),零流量時(shí)軸功率小，應(yīng)關(guān)閉出口閥門(mén)啟動(dòng)反之高比轉(zhuǎn)速泵零流量時(shí)軸功率大，應(yīng)在出口閥門(mén)打開(kāi)時(shí)啟動(dòng);低比轉(zhuǎn)速泵高效區(qū)比較寬高比轉(zhuǎn)速泵商效率區(qū)比較窄;低比轉(zhuǎn)速泵由于葉輪狹窄,葉輪中流動(dòng)損失較大，效率較低，反之高比轉(zhuǎn)速深效宰相對(duì)比較高。
(2)用比轉(zhuǎn)速進(jìn)行相似設(shè)計(jì)。在離心泵的相似設(shè)計(jì)中，可以根據(jù)比轉(zhuǎn)速相等的原則.從現(xiàn)有的經(jīng)過(guò)實(shí)踐證明性能良好的泵中選取模型泵然后利用相似定律把模型泵的性能參數(shù)和幾何參數(shù)換算成原型泵的性能參數(shù)和結(jié)構(gòu)尺寸。當(dāng)根據(jù)工作需要的Q、H和n計(jì)算出n、值小于30時(shí)，一般采用容積式泵;當(dāng)比轉(zhuǎn)速n.>30時(shí)，則采用離心泵、混流泵或軸流泵等。渣漿泵廠(chǎng)家
(3)用比轉(zhuǎn)速編制離心泵系列。在編制離心泵系列時(shí)，只要適當(dāng)?shù)剡x擇流量、揚(yáng)程和轉(zhuǎn)速的組合， 就可以將反映同一.類(lèi)型泵的性能和結(jié)構(gòu)的綜合性參數(shù)n。繪在同一張坐標(biāo)圖上，即型譜圖,并使n。在型譜圖上均勻地分布。這樣就大為減少水力模型的數(shù)目,對(duì)設(shè)計(jì)制造部門(mén)來(lái)說(shuō)，就能節(jié)約大量人力、物力
The specific speed of slurry pump has an important use in pump classification, similar design and product serialization.
(1) Pumps are classified by specific speed. The specific speed of centrifugal pump has nothing to do with the nature of liquid delivered, but has a close relationship with the shape of impeller and the characteristic curve of pump. According to the specific speed, the pump can be divided into low specific speed, medium specific speed and high specific speed centrifugal pump, and mixed flow pump and axial flow pump with higher specific speed. See table 1-7. At the same time, table 1-7 also shows the relationship between specific speed and impeller shape and characteristic curve shape. It can be seen that the low specific speed pump mainly refers to the high head and small flow, while the high specific speed pump represents the low head and large flow; the impeller shape of the low specific speed pump is narrow and long, and the impeller of the high specific speed pump is wide and short; the characteristic curve of the low specific speed pump is that the shaft power is small when the flow is zero, and the outlet valve should be closed to start; on the contrary, the shaft power is large when the flow of the high specific speed pump is zero, and it should be started when the outlet valve is open; the low specific speed pump The high efficiency area is wider than that of high specific speed pump, and the efficiency area is narrower; because the impeller of low specific speed pump is narrow, the flow loss in the impeller is larger, and the efficiency is lower, on the contrary, the high specific speed and deep efficiency are relatively high.
(2) Similar design with specific speed. In the similar design of centrifugal pump, according to the principle of equal specific speed, the model pump can be selected from the existing pumps with good performance, and then the performance parameters and geometric parameters of the model pump can be converted into the performance parameters and structural dimensions of the prototype pump by using the similarity law. When the value of N calculated by Q, h and N is less than 30, the positive displacement pump is generally used; when the specific speed is more than 30, the centrifugal pump, mixed flow pump or axial flow pump are used. Slurry pump manufacturer
(3) The centrifugal pump series is designed with specific speed. In the design of centrifugal pump series, as long as the combination of flow, head and speed is properly selected, the comprehensive parameter n reflecting the performance and structure of the same type pump can be obtained. It is drawn on the same coordinate map, i.e. type spectrum, and n. It is evenly distributed on the type spectrum. In this way, the number of hydraulic models can be greatly reduced, and a lot of manpower and material resources can be saved for the design and manufacturing department
