Patent ID: 8734121

Claim:
A flow guide structure for bladeless air fans, comprising: a host including an airflow generator; an airflow guiding frame which is connected to the host and includes an air discharging portion, the air discharging portion forming an airflow guiding passage inside to communicate with the airflow generator and including a closed airflow gathering wall, an inner ring compression wall and an outer ring compression wall extended forwards respectively from two ends of the airflow gathering wall, the inner ring compression wall and the outer ring compression wall being spaced from each other at a gradually shrinking distance respectively from a junction between the airflow gathering wall and the inner ring compression wall and the junction between the air gathering wall and the outer ring compression wall, the inner ring compression wall and the outer ring compression wall comprising respectively a distal end spaced from each other by a gap to form a front air outlet to discharge airflow forwards; wherein the inner ring compression wall further includes a first extension and a first compression section which comprises a first compression convex rim on an inner side, the first compression convex rim comprising a surface extended to the front air outlet, wherein the outer ring compression wall further includes a second extension and a second compression section which comprises a second compression convex rim on an inner side, the second compression convex rim comprising a surface extended to the front air outlet.