Fan

Abstract

The present invention is to provide a fan, comprising a nozzle mounted on a base; the nozzle comprising a first wall, a second wall, and a Coanda surface for producing Coanda effect, wherein the first wall assembles abreast to the second walls producing a slot to form a nozzle airflow outlet.

What is claimed is: 
     
         1 . A fan for speeding up airflow, comprising:
 a base, for jetting airflow; and   a nozzle, mounted on the base for extending a range from which airflow is output, the nozzle including:
 a nozzle airflow inlet, formed on the nozzle as an opening, for directly receiving airflow jutted from an airflow outlet of the base; 
 a first wall; 
 a second wall, arranged abreast and assembled to the first wall; 
 a first wall end, located at one end where the first wall is assembled abreast to the second wall; 
 a second wall end, located at opposite end where the first wall is assembled abreast to the second wall; 
 a first wall edge, being a wall edge where the first wall and the second wall extend toward one side and are assembled abreast; 
 a second wall edge, being a wall edge where the first wall and the second wall extend toward an opposite side and are assembled abreast, and having a nozzle airflow outlet for jetting airflow, wherein the first wall is folded reversely from one side of the second wall edge, and the second wall is folded inward reversely from one side of the second wall edge so as to from a closed surface or is folded outward reversely so that the nozzle airflow outlet is formed between reverse folded parts of the first and second walls; and 
 a Coanda surface, deposited at the nozzle airflow outlet for guiding airflow by Coanda effect. 
   
     
     
         2 . The fan of  claim 1 , wherein the first wall end and the second wall end have two ends thereof extending and connected to each other so as to form a nozzle internal airflow channel or the first wall end and the second wall end are closed respectively so as to prevent airflow from flowing out the first wall end and the second wall end. 
     
     
         3 . The fan of  claim 2 , wherein the nozzle internal airflow channel is an annular space. 
     
     
         4 . The fan of  claim 3 , wherein the first wall end and the second wall end are connected directly to form the annular space that prevents airflow from flowing out. 
     
     
         5 . The fan of  claim 1 , wherein the base comprises:
 an internal fan, installed inside the base;   a base airflow inlet, provided at one side of the internal fan as entrance of drawn airflow;   a base airflow outlet, provided at the other side of the internal fan and the internal fan directly jets airflow to the base airflow outlet.   
     
     
         6 . The fan of  claim 4 , wherein the internal fan is a forced-draft fan, a jet turbine blade air-guiding fan or a flat fan. 
     
     
         7 . The fan of  claim 1 , wherein the nozzle airflow outlet is a tapered slot. 
     
     
         8 . The fan of  claim 1 , wherein the nozzle has a first closed surface formed by the first wall end being closed to prevent airflow from flowing out of the first wall end and a second closed surface formed by the second wall end being closed to prevent airflow from flowing out the second wall end. 
     
     
         9 . The fan of  claim 1 , wherein a third wall is provided between the first wall end and one side of the second wall end facing the second wall edge for preventing airflow from flow out. 
     
     
         10 . The fan of  claim 1 , wherein the fan further comprises one or a plurality of filtering pieces provided at the inner side of the base.