Tower fan and air channel therefor

An air channel arrangement for accommodating an air blower having a cylindrical shape therein, including:

• a housing defining an air channel therein and having an air inlet, an air outlet and an air blower installation space, wherein the air blower installation space is a cylindrical space formed and arranged for accommodating the air blower for generating an air flow to flow through the air channel and guided by the air channel, wherein a diameter of the air blower installation space is R1;
• a volute shell including an air intake portion extending from a side thereof adjacent to the air inlet in a direction gradually towards the air blower installation space;
• and
• a volute member which is a cylindrical body having a curved surface portion, wherein the volute shell and the volute member are opposingly and correspondingly arranged on two sides of the air outlet respectively while a gap is retained between the volute member and the air blower, such that the volute shell and the volute member incorporate with each other to provide a guiding of the airflow within the housing so as to ensure a flow of the airflow in the air channel while preventing a backflow of air repeatedly in the air channel and avoiding a formation of eddy airflow, wherein the curved surface portion of the volute member is a partial side surface of the volute member and configured to guide the airflow in the air channel, wherein a diameter of the volute member where the curved surface portion is provided is larger than the diameter of the bottom of the air blower installation space R1, wherein a radius of a bottom surface of the volute member where the curved surface portion is located is R2, wherein R1/10≤R2≤R1/9, wherein an edge curvature length of the curved surface portion is L1, wherein R1/5≤L1≤3R1/10.