双锥对置锥螺杆海水液压泵的运动学分析

Kinematics Analysis of Opposed Biconical Cone Screw Seawater Hydraulic Pumps

为了研究双锥对置锥螺杆海水液压泵的运动特性,建立了锥螺杆球断面中心点及其外表面上点的位移方程及速度方程,并对锥螺杆-衬套副的运动学特性进行了仿真分析.结果表明:锥螺杆基锥半锥角越小,其球断面中心点的运动轨迹越趋于一条直线;锥螺杆外表面上不同点的运动轨迹为大小不同的"球面椭圆";锥螺杆球断面中心点及外表面上点的位移、速度沿各坐标轴方向的分量均呈周期变化,沿x、y轴方向的变化周期为锥螺杆运动一周的时间,沿z轴方向的变化周期为锥螺杆运动半周的时间;当锥螺杆球断面中心点及其外表面上点的位移幅值最小时,其运动速度达到最大,反之最小.

To study the motion characteristics of the opposed biconical cone screw seawater hydraulic pump, the displacement and velocity equations of different points on the screw were presented. The motion simulation of points on the screw was also conducted on the basis of the three-dimensional model and virtual assembly. Analysis shows that trajectory of the screw spherical section center is prone to a straight line with smaller basal cone＇s half cone angle; trajectories of different exterior surface points are spherical ovals in different sizes; displacement and velocity＇s components on each axis of the screw spherical section center and its exterior surface points vary periodically, and variation period on x-axis and y-axis is equal to the time in which screw runs a circle, while the screw runs half a circle on z-axis ; when the displacement of above points reaches its minimum, the velocity reaches its maximum, and vice versa.