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Modeling the kinetics of the preparing process is necessary to produce a product with the appropriate particle properties and minimum production cost.Owing to the lackness of crystal size distributor (CSD) information,however,solvent-mediated phase transformation encounters difficulty in modeling the kinetics as compared to solution crystallization.Consequently,a model was established by making the product CSD to move along by horizontal translation to obtain the CSDs of the stable phase in the process of transformation.Then the moment method was used to solve the popular balance equation,and the least square nonlinear regression method was applied to estimate the kinetics parameters.The model has been successfully used to simulate the transformation of CaSO4?2H2O to α-CaSO4?1/2H2O in an isothermal seeded batch crystallizer with different stirring speeds,and it is beneficial to producing high performance α-CaSO4?1/2H2O crystals which have the right particle characteristics. 相似文献
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余摆线真空泵泵腔与转子型线的形成,是由固定在泵体上的小齿轮和转子上的内齿围相互无侧隙啮合而成。实际上,泵在运转工作时,考虑温升和齿侧间隙间的润滑,内齿圈和小齿轮齿面间必须留有一定的齿侧间隙。此侧隙由图1不难看出,会影响转子与泵腔型线间的相互啮合,即影响两者运转时彼此正确的相对位置。 泵在运转后,一转子相对于泵腔在一周360°范围内停止在任何位置均有可能,图示为任一位置,泵再次起动在Cn这一瞬间,内齿圈并非与个齿轮利用齿面啮合转动,而是围绕其本身中心O2转动一角度β,此时与内齿圈配装在一起的转子上一点A'亦同时围绕O2… 相似文献
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分析机器装配尺寸链,就是从机器各零部件间错综复杂的尺寸联系中,找出它们之间的相互联系,即找出对机器装配精度与技术要求有影响的是哪些尺寸,从而适当控制这些相关尺寸,并对这些尺寸给予经济合理的公差,以保证达到机器最终装配精度的要求。 图1是YZ-300型余摆线真空泵装配结构图,为保证该泵的抽气极限真空度,以及在运转中转子与泵腔间不致因热膨胀而相互碰触,甚至产生卡死现象,该泵从技术性能和装配精度要求,在保证两者间形成一定油封油膜的前提下,根据使用要求和生产经验,对此取转子与泵腔间侧向装配间隙为0.08～0.16毫米,径向间隙为0.0… 相似文献
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