大范围流量与压力协同控制下调节阀结构优化与动态特性OA

In order to make the lifting device in mechanical production meet the requirements of working parameters such as pressure and flow under the conditions of different well depths and liquid production capacity,a pressure regulating valve that can achieve a pressure adjustment range of 1-15 MPa in the flow rate range of 50-300 m3/d was designed.The simulation and analysis of pressure regulating valve with a triangular linear throttle groove were performed using CFD layered dynamic-mesh technique,and curves of regulated pressure with spool stroke at different flow rates were obtained.It is found that the pressure regulation performance is poor at low flow rates.After optimizing the triangular linear throttle groove into a triangular spiral groove,the impact of different pitches on the pressure regulation performance was evaluated.The results indicate that the smaller the pitches,the better the regulation performance at low flow rates,and according to the commonly used flow rates in the oilfield,an 80 mm pitch was the optimal value.To address the issues of an excessively pressure change at the begining of regulation and the limited effective adjustment stroke,an auxiliary spiral groove was added at the inlet end of the spool and enlarged the size of the spiral groove at the outlet end.Conse-quently the pressure regulating performance of the regulating valve is basically the same under different flow rates.The spool stroke remains above 40 mm when adjusting pressure within the range of 1-15 MPa,and the average sensitivity value is 0.327 MPa/mm,which is 32.6%higher than that before optimization.