灯泡贯流泵机组支撑形式比较

Comparison of bulb tubular pump unit′s support forms

为了优化贯流泵机组支撑结构，提高其综合性能，将贯流泵机组支撑划分为主轴系轴承座支撑、灯泡体支撑和泵体支撑3个层次．研究了3种典型贯流泵机组的支撑形式；通过受力分析，计算了主轴变形和疲劳强度安全系数；从泵机组可靠性、安装维修性、总体结构和泵装置水力性能等方面，比较了几种支撑形式．从主轴轴承数量、布置及安装、灯泡体支撑和泵体支撑等方面，提出了灯泡贯流泵机组支撑的设计原则和方法．结果表明：灯泡贯流泵机组支撑形式不但影响可靠稳定性能和安装维修性能，还严重影响系统水力性能．电机转子和水泵叶轮挠度分别为0．19～0．39mm和0．22～0．62mm，滑动轴承和滚动轴承油膜厚度分别为0．41～0．53mm和0．12～0．17mm：为了保证运行时电机空气间隙和水泵叶片间隙均匀，导轴承座安装高程应考虑转子和叶轮的挠度以及导轴承的油膜厚度．合理布置导轴承，灯泡体采用辐射板支撑，进人孔与灯泡体底部主支撑合用，采用金属管泵段式结构，可以提高灯泡贯流泵机组的可靠性能和水力性能．结果对灯泡贯流泵机组的优化设计具有参考价值．

In order to optimize supporting structures of bulb tubular pump units and improve the properties, the supports of bulb tubular pump units were divided into 3 hierarchies, i.e. the bearing block support, the bulb support and the pump body support. The support forms of 3 typical bulb tubular pump units were investigated. The shaft deformations and fatigue strength safety factors were calculated through force analysis. Several typical support forms were compared in pump unit reliability, installation, maintainability and overall structure, and the pump system hydraulic performances. The design principles and methods of bulb tubular pump unit supports were put forward in bearing number and their arrangement and installation, the bulb supports and the pump body supports. The results show that supporting forms of bulb tubular pump units affect reliability, stability, installation and maintainability of the pump units and the pump system hydraulic performances. The flexivities of motor rotor and pump impeller reach 0.19 0.39 mm and 0.22 - 0.62 mm, respectively. The oil film thicknesses of journal bearings and rolling bearings are 0.41 - 0.53 mm and 0. 12 - 0. 17 mm, respectively. When determining the installation height of the bearing saddle, the flexivities of the rotor and the impeller and oil film thicknesses of the bearings should be considered so that the motor＇s air gap and the clearance between pump blade and shell are evenly distributed. The reliability and hydraulic performances of bulb tubular pump units could be improved by reasonably arranging guide bearings, adopting radiating plate support of the bulb, combining the maintenance channel and the main support which is under the bulb, and using the metal pipe pump structure. The achievements could provide references to optimum design of bulb tubular pump units.