【摘要】 大型土工离心机由于主轴轴径大、线速度高，使得现有磁流体密封结构很难满足安装、发热等要求。设计一种新型剖分式磁流体密封装置，利用有限元数值分析方法研究剖分式结构变形、极靴组件结构参数对密封性能的影响及密封装置温度分布，考虑实际加工能力，运用正交试验对结构参数进行优选。结果表明：结构参数对密封性能的影响程度由大到小依次为密封间隙、永磁铁高度、永磁铁宽度、槽宽、齿宽、齿高；优化后密封装置的各结构参数分别为密封间隙0.5 mm、齿宽2 mm、齿高2 mm、槽宽2.8 mm,永磁铁宽度11 mm、永磁铁高度22 mm;优化后的密封压力值为0.97 MPa,高于未优化前的0.54 MPa,同时高于工况要求的0.1 MPa;大轴径磁流体密封在工作时，存在轴套积热问题，需要在轴套部位开设冷却腔。更多还原

【Abstract】 Due to the large spindle diameter and high linear speed, the existing magnetic fluid sealing structure is difficult to meet the requirements of installation and heating of large-scale geotechnical centrifuges.A new type of split magnetic fluid sealing device was designed, and the finite element numerical analysis method was used to study the influence of the split structure deformation, the structural parameters of the pole shoe assembly on the sealing performance and the temperature distribution of the sealing device.Considering the actual processing capacity, orthogonal experiments were used to optimize the structural parameters.The results show that the degree of influence of structural parameters on sealing performance is as follows, the sealing clearance, the permanent magnet height, the permanent magnet width, the slot width, the tooth width, and the tooth height.The parameters of the optimized sealing device are sealing gap 0.5 mm, tooth width 2 mm, tooth height 2 mm, slot width 2.8 mm, permanent magnet width 11 mm, and permanent magnet height 22 mm.The optimized sealing pressure value is 0.97 MPa, which is higher than the pressure value of 0.54 MPa before optimization, and higher than the pressure value of 0.1 MPa required by the operating conditions.During the operation of the large diameter magnetic fluid seal, there is a problem of heat accumulation in the shaft sleeve, and a cooling chamber needs to be set up in the shaft sleeve area.更多还原