全金属单螺杆泵结构优化设计

Optimum Design of All-metal Screw Pump

利用Matlab软件对全金属单螺杆泵的结构参数进行了数值分析，从理论上分析了短幅内摆线等距型和短幅外摆线等距型的线型特点。结合设计实例，对比相应理论性能参数优化设计了全金属单螺杆泵线型和头数；应用ANSYS软件对定、转子做了热力耦合分析，同时建立了全金属螺杆泵的三维流场模型，利用Fluent软件研究了全金属螺杆泵在不同黏度下的泵效随配合间隙的变化规律。分析结果表明，全金属螺杆泵定转子的断面线型选择短幅内摆线等距型更加合理，头数比优选1：2或2：3；全金属螺杆泵在热采环境中优势明显，配合间隙考虑在0．10～0．30mm之间选取，冷采环境在0．30—0．50mm之间选取，给出了各种黏度下的间隙优选图。该项研究成果对全金属螺杆泵的优化选型有着重要的指导意义。

The Matlab software was used to conduct a numerical analysis of the structural parameter of all-metal screw pump. A theoretical analysis of the linetype feature of eurtate hypocycloid isometric type and curtate epicycloid isometric type was carried out. In combination of the design example, referring to the COITesponding theoretical performance parameter, a design optimization of the linetype and thread number of all-metal screw pump was con- ducted. The ANSYS software was used to make a thermo-mechanieal coupling analysis of stators anti rotors. Meanwhile, the three-dimensional flow field model of the pump was established. The Fluent software was used to study the variation law of pump efficiency with fit clearance under different viscosities. The analysis shows that it is more reasonable to choose curtate hypocyeloid isometric type as the section linetype of the stators and rotors of the pump. The number of threads can be optimized as 1 ： 2 or 2： 3. The pump has its own remarkable advantage in the thermal recovery environment, and the fit clearance can be selected between 0. 10 mm and 0.30 mm. While a fit clearance of 0. 30 - 0.50 mm should be selected if the production is carried out in a cold environment. The optimization diagrams of clearance are given under different viscosities. The research findings are of great importance to the type selection and optimization of the pump.