【作者】 刘强；

【导师】 王君； 王东升；

【作者基本信息】 中国石油大学(华东) ， 动力工程（专业学位）， 2018， 硕士

【摘要】 涡旋齿的型线设计一直是涡旋压缩机研究的重点,涡旋齿型线设计对于涡旋压缩机性能具有重要影响。现有全啮合涡旋齿的型线设计过程复杂、设计参数较多;等壁厚涡旋齿受力不均匀,齿头变形大。针对该问题,本文提出利用中线生成全啮合涡旋齿的设计方法,利用中线法研究现有四种齿头修正的涡旋齿,证实了中线法设计涡旋齿型线的可行性。基于所提出的中线设计方法,提出一种新型全啮合渐变壁厚涡旋齿,构成型线包括基圆渐开线和变径基圆渐开线,涡旋齿齿厚由外圈向中心逐渐增加;应用Maple软件编写涡旋齿型线设计程序,同时得到全啮合渐变壁厚双涡旋齿的型线方程;研究了新型涡旋齿型线参数变化对于压缩机性能的影响;利用Ansys仿真软件对于建立的涡旋压缩机工作腔模型进行数值模拟,分析工作腔的流场变化以及涡旋齿的应力变形。本文提出利用中线设计涡旋齿型线,具有设计过程简单、变量少,便于优化设计等优点;对比分析四种齿头修正型线,在相同边界条件下,圆渐开线的齿头修正的的内容积比最大;本文所提出的新型全啮合渐变壁厚涡旋齿压缩机,具有吸气容积大,齿头应力变形小的特点;验证了新型渐变壁厚涡旋齿和双涡旋齿的全啮合特性;随着变径基圆R_b的增加,涡旋齿厚度增加,有利于减少涡旋齿的受力变形;随着修正展角?的减小,内容积比增加,容积利用率增加;随着基圆半径R_b1增加,内容积比增加;R_b的变化对于容积效率以及吸气量影响很大,R_b1对于容积效率影响较少;与等壁厚涡旋齿涡旋压缩机相比,渐变壁厚涡旋齿涡旋压缩机的流场泄漏线长度短,增压快,压缩比大;新型渐变壁厚涡旋齿厚度增加的方向和介质压力的增加方向一致,齿头应力值较小,变形值也较小。本文提出的中线设计法和新型全啮合渐变壁厚涡旋齿,对于涡旋压缩机的设计和应用,以及丰富涡旋压缩机的几何型线具有重要理论和工程意义。更多还原

【Abstract】 The profile design of scroll wrap is always the focus of the research on scroll compressor.Different scroll wrap profiles have different performance characteristics.The existing completely-meshing scroll wrap has complex design process and more design parameters.Meanwhile,the force of the constant thickness scroll wrap is uneven and the tooth deformation is large.In this paper,a method of middle for generating completely meshing wraps is proposed.Four types of scroll wrap modification were studied using the midline method,it was found that the circular involute modified wrap has a good working characteristics.Thus a new completely-meshing tapered thickness scroll is designed（the scroll profile includes the base circle involute and the variable base circle involute）.The thickness of the scroll is gradually increased from periphery to center.The program of designing the scroll wraps was wrote.The equations of the scroll wraps for the completely-meshing tapered thickness double scroll were obtained.The working chamber of the novel scroll compressor was analysised with numerical simulation by the Ansys.The flow field distribution,the stress and deformation for scroll wraps were studied.The novel design method of midline is proposed,which advantage is easy to design and improve.The results show that the involute head modification has the best effect on the compressor pressurization among the four types of head modification under the common condition.A new type of completely meshing tapper scroll wrap is proposed,whose suction volume is large and the stress and deformation is small.The completely meshing characteristics for the novel tapered thickness scroll and double scroll is verified.The variable diameter R_b increase,the thickness of the scroll increases which is help for reducing the deformation.The angle?decrease,the volume ratio is increased and volume utilization rate is increased.The diameter R_b1 increase,the volume ratio is increased.The change of R_b has great influence on volumetric efficiency and suction volume,the R_b1 is not.In the same working space,the leakage line in the flow field of the scroll compressor for taper thickness scroll is shorter and pressurization is faseter compared to the even thickness scroll.The stress and deformation for the novel taper thickness scroll is small.The compression ratio can be greatly improved by the reducing of axial leakage.The design method with midline for scroll wraps and the novel completely-meshing taper thickness scroll have important theoretical and engineering significance for the improvement of the scroll design and the enrichment of the geometric profile of the scroll compressor.更多还原