ZHENG Xinqian，LIN Yun，ZHANG Yangjun，LAN Chuangjie，ZHUGE Weilin，TAMAKI Hideaki，KAWAKUBO Tomoki; Centrifugal Compressor with Asymmetrical Vaneless Diffuser and Process Method，2013.7.17-2033.7.17, Chinese Patent，ZL 201110070488.1。