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        1. 上海乾思生物科技有限公司
          中級(jí)會(huì)員 | 第16年

          18916423352

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          SIGMA現(xiàn)貨,SIGMA代理

          離心機(jī)分離因數(shù)介紹

          時(shí)間:2011/11/18閱讀:2025
          分享:
          離心機(jī)分離因數(shù)是離心機(jī)轉(zhuǎn)鼓內(nèi)的懸浮液或乳濁液在離心力場(chǎng)中所受的離心力與其重力的比值,即離心加速度與重力加速度的比值。分離因數(shù)以Fr表示: 式中R為被分離物料在轉(zhuǎn)鼓內(nèi)位置的半徑(米);ω為轉(zhuǎn)鼓的旋轉(zhuǎn)角速度(弧度/秒);g為重力加速度(9.81米/秒2);n為轉(zhuǎn)鼓轉(zhuǎn)速(轉(zhuǎn)/分);m為轉(zhuǎn)鼓內(nèi)物料的質(zhì)量(千克)。分離因數(shù)是衡量離心機(jī)性能的主要指標(biāo)。Fr越大,離心分離的推動(dòng)力就越大,離心機(jī)的分離性能也越好。但對(duì)具有可壓縮變形濾渣的懸浮液,過(guò)大的Fr會(huì)使濾渣層和過(guò)濾介質(zhì)的孔隙阻塞,分離效果惡化。分離過(guò)程中物料在離心機(jī)轉(zhuǎn)鼓內(nèi)處于不同半徑的位置時(shí),F(xiàn)r值也不同。采用高轉(zhuǎn)速比加大轉(zhuǎn)鼓直徑更易于提高Fr,因此高分離因數(shù)的離心機(jī)均采用高轉(zhuǎn)速和較小的轉(zhuǎn)鼓直徑,此時(shí)轉(zhuǎn)鼓的應(yīng)力較小。離心機(jī)的Fr通常是指轉(zhuǎn)鼓內(nèi)壁zui大直徑處的值(此時(shí)上式中的R為轉(zhuǎn)鼓內(nèi)壁zui大半徑)。過(guò)濾離心機(jī)的Fr為100~1500,沉降離心機(jī)的Fr為1000~6000,氣體分離用超速管式離心機(jī)的Fr高達(dá)62000,實(shí)驗(yàn)分析用超高速離心機(jī)的Frzui高可達(dá)610000。

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