一种新型变壁厚涡旋型线的构建理论

Construction theories of a new type of variable wall thickness scroll profile

在深入研究涡旋压缩机型线构造方式的基础上,提出了一种利用Frenet活动标架构建涡旋型线的新方法,利用该方法构建了一种新型的变壁厚涡旋型线,并建立了该型线的基本几何理论,详细推导了工作腔容积。在此基础上引入了压缩比、面积利用系数、轴向气体力和切向气体力4个性能指标,对其性能进行评估。结果表明:在相同几何参数条件下,与传统的变壁厚涡旋型线相比,新型变壁厚涡旋型线的各项性能均较优,不但压缩比和面积利用系数分别提高了7.15%和4.84%,而且所受的轴向气体力和切向气体力也明显较小。可见,采用新型的变壁厚涡旋型线有助于进一步提高涡旋压缩机的性能。

On the basis of in-depth study of scroll compressor profile construction,a new method for constructing scroll profiles using Frenet moving frame was proposed,a new type of variable wall thickness scroll profile was constructed by this method. The basic geometrical theory of the profile was established and the working chamber volume was also derived. On this basis,four performance indexes including compression ratio,area utilization coefficient,axial gas force and tangential gas force were introduced to evaluate its performance. The results show that under the same geometrical parameters,the newly constructed variable wall thickness scroll profiles have better performance than traditional variable wall thickness scroll profile. Not only the compression ratio and the area utilization coefficient are increased by7.15% and 4.84% respectively,but also the axial gas force and tangential gas force are also significantly smaller. It can be seen that the use of this variable wall thickness scroll profile helps to further improve the performance of the scroll compressor.