多级离心泵轴向力测试与平衡改进设计研究

发布时间：2018-01-04 06:38

本文关键词：多级离心泵轴向力测试与平衡改进设计研究　出处：《北京林业大学》2011年硕士论文　论文类型：学位论文

【摘要】：多级小流量离心泵在运行时会产生较大的轴向力,如不采取措施来平衡轴向力,则会影响泵的运行稳定性和可靠性,降低寿命,造成严重的后果。若要平衡离心泵轴向力首先要确定轴向力的大小,理论经验计算法、实验测试法和数值模拟法是目前获得轴向力的的主要方法。平衡盘是最常见的一种平衡离心泵轴向力的结构。本研究针对现有需要改进三级小流量离心消防泵,首先利用传统的理论计算方法计算泵的轴向力,并利用CFD数值模拟确定轴向力；其次,通过离心泵内部机构以及给定空间,设计出一个弹性元件(测力环)测量轴向力,对其结构进行模拟分析并改进。在所设计测力环的基础上,找到测试元件产生应变的最佳位置,粘贴应变片并完成测力弹性元件的静态标定,设计整个轴向力的测试方案；最后,根据已有研究对平衡装置数值模拟结果,设计改进三级消防泵。在生产出样机之后,实验测试该三级离心泵的效率、扬程和流量等性能参数,对原有三级离心泵的和带有平衡机构离心泵的进行轴向力测试。根据测试结果探讨了多级小流量离心泵的轴向力与流量、扬程等参数的关系,证明了轴向力测试系统具有一定的有效性,平衡机构减小了离心泵轴向力,并提高了泵的使用寿命。
[Abstract]:The multi-stage small flow centrifugal pump will produce a large axial force in operation. If no measures are taken to balance the axial force, it will affect the stability and reliability of the pump operation and reduce the life of the pump. If we want to balance the axial force of centrifugal pump, we must first determine the magnitude of axial force, theoretical experience calculation method. The experimental test method and numerical simulation method are the main methods to obtain axial force at present, and the balancing disk is the most common structure of balancing centrifugal pump axial force. Aiming at the need to improve the three-stage centrifugal fire pump with small flow rate, the axial force of the pump is calculated by the traditional theoretical calculation method, and the axial force is determined by CFD numerical simulation. Secondly, through the internal mechanism of centrifugal pump and given space, an elastic element (force ring) is designed to measure axial force, and its structure is simulated and improved. Find out the best position of the strain, paste the strain gauge and finish the static calibration of the elastic element, and design the whole test plan of the axial force. Finally, according to the numerical simulation results of the balancing device, the three-stage fire pump is designed and improved. After the prototype is produced, the performance parameters of the three-stage centrifugal pump, such as efficiency, lift and flow rate, are tested experimentally. The axial force of the original three-stage centrifugal pump and the centrifugal pump with balancing mechanism was tested. Based on the test results, the relationship between axial force and flow rate, lift and other parameters of multi-stage small flow centrifugal pump was discussed. It is proved that the axial force measurement system is effective and the balance mechanism reduces the axial force of the centrifugal pump and improves the service life of the pump.
【学位授予单位】：北京林业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH311

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