无泄漏电泵损耗分析和轴向力平衡新方法研究

发布时间：2018-10-17 19:30

【摘要】：屏蔽电泵具有完全无泄漏、安全可靠、低维修和噪音低等特点，但因其特殊结构，产生了屏蔽套涡流损耗和轴向力问题。经验公式法计算涡流损耗，有很多假设条件，计算结果误差大，不利于提高屏蔽电机的效率和满足工程实际的要求。对于轴向力的平衡，传统的平衡孔、平衡筋和平衡鼓等方法有一定的局限性，不能实时和动态地平衡，可能造成轴承的异常摩损，导致屏蔽电机无法正常工作。首先，回顾了屏蔽电泵的发展与应用情况，对屏蔽电机的结构、工作原理和设计特点进行了总结，给出了屏蔽套涡流损耗和转子摩擦损耗的经验计算公式，，针对一台2极8kw的屏蔽电机进行了电磁设计。其次，应用ANSOFT有限元软件分析计算屏蔽套的涡流损耗，分析屏蔽套材料的电阻率和屏蔽套厚度对涡流损耗的影响。选择电阻率相差较大的Sus316L不锈钢和Hastelloy-c合金作为屏蔽套材料，研制了四种情况下的样机，构建实验系统进行试验。根据实验结果，分离屏蔽套涡流损耗，并与仿真计算值和公式值对比分析，得出影响屏蔽套涡流损耗的因素，对经验公式提出修正。利用ANSOFT有限元软件对屏蔽电机进行温度场分析，得出额定负载和起动时定转子屏蔽套的最高温度值，计算出相应运行状态时屏蔽套的热变形量。最后，提出一种新型永磁无接触式轴向力平衡新结构，应用有限元软件分析计算平衡力特性，并进行实验验证；实验表明，利用ANSOFT有限元软件可以作为设计和计算新型永磁无接触轴向力平衡结构的有效方法。针对2极8kw屏蔽电机驱动的流量为O=30m/h和扬程为H=35m屏蔽电泵，分析了平衡轴向力的效果，从而确定合适的轴向力平衡装置结构形式和结构参数。
[Abstract]:The shielded electric pump has the characteristics of no leakage, safety and reliability, low maintenance and low noise. However, due to its special structure, the eddy current loss and axial force of the shield sleeve are caused. The calculation of eddy current loss by empirical formula method has many hypothetical conditions, and the error of calculation result is large, which is not conducive to improving the efficiency of shield motor and meeting the requirements of engineering practice. For the balance of axial force, the traditional methods such as balancing holes, balancing bars and balancing drums have some limitations, which can not be balanced in real time and dynamically, which may cause abnormal friction loss of bearings and lead to the failure of normal operation of shield motor. Firstly, the development and application of the shielded electric pump are reviewed, the structure, working principle and design characteristics of the shielded motor are summarized, and the empirical calculation formulas of the eddy current loss and the friction loss of the rotor are given. The electromagnetic design of a 2-pole 8kw shielded motor is presented. Secondly, the eddy current loss of shield sleeve is calculated by ANSOFT finite element software, and the influence of resistivity and thickness of shield sleeve on eddy current loss is analyzed. The Sus316L stainless steel and Hastelloy-c alloy with large resistivity difference were selected as shielding sleeve materials. Four kinds of prototypes were developed and the experimental system was constructed to carry out the experiment. According to the experimental results, the eddy current loss of the shield sleeve is separated, and compared with the calculated value and the formula value, the factors affecting the eddy current loss of the shield sleeve are obtained, and the empirical formula is revised. The temperature field of the shielded motor is analyzed by using ANSOFT finite element software, the maximum temperature of the shield sleeve at rated load and starting time is obtained, and the thermal deformation of the shield sleeve in the corresponding running state is calculated. Finally, a new type of permanent magnet contactless axial force balancing structure is proposed, which is analyzed and calculated by finite element software and verified by experiments. The ANSOFT finite element software can be used as an effective method to design and calculate the new permanent magnet contactless axial force balance structure. The effect of balancing axial force is analyzed in view of the flow rate of O=30m/h driven by two-pole 8kw shielded motor and the shielded electric pump with a head of 35 m, so as to determine the appropriate structural form and structural parameters of the axial force balancing device.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH38

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