多场耦合下三螺杆泵转子振动特性研究  

Study of Vibration Characteristics of Rotor in Three Screw Pump under Condition of Multi-field Coupling

作　　者：陈小怡[1] 洪震[1] Chen Xiaoyi;Hong Zhen(College of Intelligent Manufacturing and Automotive Engineering,Luzhou Vocational and Technical College,Luzhou 646000,China)

机构地区：[1]泸州职业技术学院智能制造与汽车工程学院,四川泸州646000

出　　处：《化工设备与管道》2022年第1期57-63,80,共8页Process Equipment & Piping

基　　金：泸州市重点科技项目(GY201804)。

摘　　要：针对三螺杆泵的主从动螺杆转子发生结构破坏问题,基于流热固多场耦合原理,通过求解螺杆泵内流场的N-S方程和螺杆结构运动方程,分析泵内的温度载荷和压力载荷共同对转子变形和振动的影响。研究结果表明:螺杆泵的泵内压力从出口到进口位置呈阶梯状递减,泵内温度从出口到进口也逐渐递减;温度载荷对螺杆转子形变的影响较大。主从动转子的最大变形和应力与螺杆泵出口压力成正比,主从动转子的最大变形、主动转子最大应力与转速成正比,从动转子最大应力与转速成反比。泵内压力载荷和温度载荷会导致转子的模态频率降低,但对转子的模态振型影响较小。本文的研究结果对三螺杆泵结构的优化设计提供有价值的参考。With respect to the rupture occurred in the driven screw rotor in three screw pump,in this paper,based on fluid-heat-solidmulti-field principle and by solving N-S equation for the flow field in the pump and the motion equation for the screw structure,the combined effects of the temperature and pressure in the pump to the deflection and vibration of the rotor were analyzed.It was shown that the pressure in the pump is decreased stepwise from outlet to inlet;temperature has relatively large effect to the deflection of the screw rotor;the maximum deflection and stress in driven rotor are proportional to the pressure at the outlet;both the maximum deflection of the driven rotor and maximum stress in the driving rotor are proportional to rotary speed,but the maximum stress in driven rotor is inversely proportional to rotary speed;the pressure and temperature in the pump will induce the reduction of the modal frequency of the rotor,but have a little influence to the modal shape.The studied results presented in this article may valuable to the optimum design of three screw pump.

关 键 词：三螺杆泵 N-S方程 温度载荷 压力载荷 

分 类 号：TQ050.2[化学工程] TH327[机械工程—机械制造及自动化]