三螺杆泵的温度场及热力耦合分析

Analysis of Temperature Field and Thermal Mechanical Coupling of Three Screw Pump

为适应三螺杆泵高速、高压、大流量的发展趋势,严格控制螺杆变形及其相关间隙以减少泵内泄漏是关键。以三螺杆泵为研究对象,将泵内温度场作为载荷施加在主、从动螺杆表面,并进行温度-结构耦合的数值模拟分析。研究不同工况下三螺杆泵内温度和工作扭矩使主、从动螺杆产生的变形规律,并对比与主、从动螺杆在各单独物理场作用下和耦合作用下的变形和应力变化。结果表明:主、从动螺杆的热变形比力矩变形更明显。随着工作温度升高,主、从动螺杆的热变形量增大,主、从动螺杆产生的热应力与工作温度呈正比关系;在同一工作温度下,主、从动螺杆在X、Y、Z 3个方向的变形量均增加,而Z方向的变形量远大于X和Y方向的变形量。

In order to adapt to the development trend of high speed, high pressure and large flow of three screw pump, it is the key to strictly control the screw deformation and its related clearance to reduce the leakage in the pump. The temperature field in a three screw pump was applied as a load on the surface of the driving and driven screws, and the temperature structure coupling numerical simulation analysis was carried out. The deformation law of the driving and driven screws caused by the temperature and working torque in the three screw pump under different working conditions was studied, and the deformation and stress changes of the driving and driven screws under the action of each individual physical field and coupling were compared. The results show that the thermal deformation of the driving and driven screws is more obvious than that of the torque. With the increase of the working temperature, the thermal deformation of the driving and driven screws increases, and the thermal stress produced by the driving and driven screws is proportional to the working temperature. Under the same working temperature, the deformation of the driving and driven screws increases in the X, Y, Z directions, while the deformation in the Z direction is far greater than that in the X direction and Y direction.