Research On The Stator Curve Argument Distribution Of Incurve Multiple-acting Type Radial Piston Pump

The incurve multiple-acting type radial piston pump has the characteristics of low speed and large displacement,so it has considerable prospect in the field of wind power and frequency conversion.In this paper,I take the stator curve with constant acceleration which are widely used in engineering machinery as the research object,and the investigation are mainly focus on the effect of argument change on the performance of the stator curve,the design methods of argument distribution of stator curve,the impact of argument distribution on the flow fluctuation of pump.The ultimate goal is to provide theoretical support to the development and design for incurve multiple-acting type radial piston pump.First of all,this paper introduces the application superiority of hydraulic technology in wind power field and frequency conversion field,points out that the low speed large displacement hydraulic pump is a tie of converting advantages in hydraulic technology into direct productive force,and puts forward a new method to realize the low speed and large displacement of the hydraulic pump by using the multiple-acting stator curve structure.Then the research status of radial piston pump at home and abroad and the main contents of this paper are summarized.Secondly,according to the working principle of incurve multiple-acting type radial piston pump,the equation of the stator curve and the equal-acceleration motion stator curve are deduced.Besides,this paper analyzes the dynamics of piston couples,finds that the argument distribution of each region of the stator curve is a key factor affecting the performance of equal-acceleration stator curve.In addition,taking the displacement chamber of incurve multiple-acting type radial piston pump as an example,this paper analyses and studies the effect of argument changes on the performance of constant acceleration stator curve under four cases such as only change constant acceleration region arguments,only change constant speed region arguments,only change constant deceleration region arguments and their combined change.The aim is to reveal the variations of the degree acceleration,degree speed,pressure angle,stator curve curvature radius and contact stress as detailed as possible after the argument changes.Thirdly,the incurve multiple-acting type radial piston pump may works in closed hydraulic circuit or open hydraulic circuit,in the light of this situation,this paper proposes two different methods to design the argument distribution of constant acceleration stator curve — — symmetric design and non-symmetric design.According to the given structural parameters,the design process and the matters needing attention of these two design methods are introduced in detail,and the performance of the stator curve which designed by these two methods is compared.Finally,this paper has carried on a detailed introduction to a simple and practicable method for researching the flow pulsation of the incurve multiple-acting type radial piston pump.Then the Instantaneous flow and the flow pulsation of incurve multiple-acting type radial piston pump which working in the closed hydraulic circuit and the open hydraulic circuit are calculated separately according to this method,and the results are compared and analyzed.