Research On Design Of Twin Screw Compressor Rotor Profile Based On Optimal Comprehensive Performance Parameters

Twin-screw compressor has been widely used in various industrial sectors because of its outstanding performance.The female and male rotor,as the core component of the Twin-screw compressor,its profile design has the most immediate influence on the overall performance of the compressor.With the advancement of “14th five-year plan” of China’s machinery industry.The State Council has put forward higher requirements for the energy efficiency of the compressor industry.And the key to solve this problem is to design the screw rotor profile with excellent performance.The core content of this subject is to optimize the rotor profile design based on the comprehensive performance of the twin-screw compressor.Firstly.The structure and working principle of the oil injection twin-screw compressor are introduced in detail.And the performance parameters of the rotor profile of the twin-screw compressor and the expression of geometric elements are deduced.So as to provide theoretical basis for the study of comprehensive performance indicators.In addition.Based on the expression of the intermonth volume and the pressure changes at each stage.The relationship among the intertooth area.Volume and rotation Angle is further explored.An evaluation method that combines fuzzy comprehensive evaluation and analytic hierarchy process(FCE-AHP)is presented in this paper for the quantitative analysis of the comprehensive performance parameters of the twin-screw compressor.Based on the relationship between the comprehensive performance and the parameters.The evaluation system of the comprehensive performance index of the twin-screw compressor is established.Next.The determination methods of various weight coefficients are carefully compared.And the weight of the comprehensive performance evaluation system is solved by the analytic hierarchy process.In addition.The principle and application process of fuzzy comprehensive evaluation method are investigated in detail.And the comprehensive performance of twin-screw compressor is evaluated by single and multi-stage fuzzy comprehensive evaluation method respectively.In order to seek a more accurate expression way of comprehensive performance index.In order to verify the accuracy of the required comprehensive performance parameter expression and the feasibility of the proposed method.Taking any rotor profile as an example.Calculating the optimized comprehensive performance index value of each segment of the profile and comparing it with the original profile.By calculating the curve expression and envelope condition expression in the forward and reverse design process of the rotor profile of twin-screw compressor in detail.And combining the composition and characteristics of the meshing line in the typical profile.The design law of the meshing line is given.Which is used to guide the optimal design of the rotor profile.Calculus basic design method of curve expression and envelope conditions.In addition.The paper start from the sealing performance of the compressor is carried out on the line of action research in detail.It is segmented by the distribution of key points on the meshing line.The influence of the change of each meshing line on the comprehensive performance index is examined in detail.Based on comprehensive performance indicators.The original profile is optimized in sections and fit a complete profile,which lays a theoretical basis for the automatic optimization algorithm of the rotor profile and meshing line in the subsequent profile design system.Finally.The design function of the rotor profile design system of twin screw compressor(TSPD)is optimized and improved.The calculation function of the comprehensive performance index of the compressor rotor profile is added as a reference value for evaluating the performance of the compressor rotor profile.And based on the rotor profile design principle and the mechanism of the influence of the meshing line change on the performance parameters.The rotor profile is realize.The automatic optimization algorithm of the meshing line increases the flexibility of the profile structure and realizes the efficient design of the profile.