The scroll geometry in the central region of the scroll wrap plays a crucial role in determining the working performance of scroll compressors. In order to improve the comprehensive performance of scroll wraps, in this study, a novel circular involute modified wrap was put forward, in which the central and peripheral wrap profiles were connected by a circular involute in the central regions, so that a pair of fully smooth and correct meshing scroll wraps were generated. A geometric model of the involute modified wrap were proposed, and then equations of the wrap profiles and relations between geometric parameters were derived. Effects of geometric parameters on the shape and performance of the involute modified wrap were discussed in detail. Furthermore, the compression ratio of the involute modified wrap was studied by numerical simulation, and the deformation of the involute modified wrap produced by temperature load and pressure load was calculated, compared with the conventional circular arc modified wrap under the same geometric shape of scroll compressors. Study results demonstrate that the proposed involute modified wrap may simultaneously improve the compression ratio and the strength of wrap head for scroll compressors; in addition, the involute modified wrap is good for design flexibility, and therefore is superior to the circular arc modified wrap.

涡卷中心区域的涡旋几何形状在决定涡旋压缩机的工作性能方面起着至关重要的作用。为了提高涡旋涡卷的综合性能，本研究提出了一种新型的圆形渐开线改进涡卷，其中心区域和外围的涡卷轮廓通过中心区域的圆形渐开线连接，使一对完全生成了平滑且正确的啮合涡卷包裹。提出了渐开线修正涡卷的几何模型，推导出了涡卷轮廓方程和几何参数之间的关系。详细讨论了几何参数对渐开线改进涡卷形状和性能的影响。此外，通过数值模拟研究了渐开线修正涡卷的压缩比，在涡旋压缩机几何形状相同的情况下，计算了渐开线改型涡卷在温度载荷和压力载荷作用下的变形量，并与常规圆弧改型涡卷进行了比较。研究结果表明，所提出的渐开线改进涡卷可以同时提高涡旋压缩机的压缩比和涡卷头的强度；另外，渐开线改形包有利于设计的灵活性，因此优于圆弧改形包。研究结果表明，所提出的渐开线改进涡卷可以同时提高涡旋压缩机的压缩比和涡卷头的强度；此外，渐开线改形包有利于设计的灵活性，因此优于圆弧改形包。研究结果表明，所提出的渐开线改进涡卷可以同时提高涡旋压缩机的压缩比和涡卷头的强度；另外，渐开线改形包有利于设计的灵活性，因此优于圆弧改形包。