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公开(公告)号:US20190085863A1
公开(公告)日:2019-03-21
申请号:US15826598
申请日:2017-11-29
发明人: Yanhu LIN , Wei LEI , Fengqi WANG
CPC分类号: F04D29/4233 , F04D13/06 , F04D17/16 , F04D29/422 , F04D29/4226 , F04D29/706 , F05D2260/602 , F24H3/065 , F24H9/0073 , F24H9/16
摘要: An induced draft fan, including a volute including a chamber and an air discharge pipe; and a wind wheel disposed in the chamber of the volute. The wind wheel is connected to and operationally driven by a rotation shaft of a motor. The air discharge pipe is disposed on one side of the volute, and includes an inner pipe and an outer pipe surrounding the inner pipe. The inner pipe of the air discharge pipe communicates with the chamber, to form an air discharge passage. An annular groove is disposed between the inner pipe and the outer pipe; and the outer end of the outer pipe is provided with a curved groove, the curved groove extends axially and circumferentially to divide the outer pipe into a fixed part and a flexible part.