搅拌反应釜端面磁流体密封设计及优化OA

To address the problems of restricted installation and insufficient heat dissipation capacity caused by the excessively large shaft diameter of magnetic fluid seals in existing stirred reactors,as well as seal leakage induced by axial oscillation under the action of centrifugal force during machine operation,a compact-structured end face magnetic fluid sealing device for stirred reactors was designed.A pressure resistance calculation model of magnetic fluid seals considering the effect of centrifugal force was established,and the finite element numerical method was used to explore the influence laws of design parameters such as sealing clearance,tooth width,tooth height and groove width on sealing characteristics,and the parameters were optimized using orthogonal test method.The results show that the seal pressure resistance value decreases with the increase of sealing clearance,increases first and then tends to stabilize with the increase of tooth width,and shows a variation characteristic of increasing first and then decreasing with the increase of both tooth height and groove width.Based on the influence laws of each parameter on sealing performance,the value ranges of the structural parameters in the orthogonal test are determined as follows:sealing clearance Lg=0.1～0.5 mm,tooth width Lt=0.5～0.9 mm,tooth height Lh=1.3～1.7 mm,and groove width Ls=1.0～1.4 mm.The order of the degree of influence of each parameter on sealing performance from the highest to the lowest is sealing clearance,tooth width,groove width and tooth height.The optimized structural parameters of the magnetic fluid seal are Lg=0.1 mm,Lt=0.7 mm,Lh=1.7 mm,Ls=1.1 mm,under which the seal pressure resistance value reaches 0.39 MPa,significantly higher than the 0.25 MPa required by the actual working conditions.This research can provide solution to the installation problems of sealing devices under special working conditions and expands the application scenarios of magnetic fluid sealing technology in the field of reactor sealing.