Fan

Abstract

The present invention is to provide a fan, comprising a base and a nozzle mounted on the base. The nozzle has a first wall, a second wall arranged generally parallel to the first wall, and a partition wall located between the first wall and the second wall. The partition wall split the airflow outlet of the base to a first nozzle airflow outlet and a second nozzle airflow outlet. The first wall edge of the second wall is folded in an annularly curved or bent manner to form a first Coanda surface adjacent to the first nozzle airflow outlet and capable of producing the Coanda effect, and the partition wall is folded either inward in an opposite direction of an airflow direction or outward in the airflow direction in an annularly curved or bent manner to form a closed wall, the closed wall forming a second Coanda surface adjacent to the second nozzle airflow outlet and capable of producing the Coanda effect.

What is claimed is: 
     
         1 . A fan, comprising:
 a base; and   a nozzle mounted on the base and having:   a nozzle airflow inlet located at the nozzle and configured as an opening for receiving an airflow ejected from the base;   a first wall;   a second wall arranged generally parallel to the first wall;   a first wall end located at an end of the generally parallelly arranged first and second walls;   a second wall end located at an opposite end of the generally parallelly arranged first and second walls;   first wall edges, which are wall edges of the generally parallelly arranged first and second walls that jointly extend to a side;   second wall edges, which are wall edges of the generally parallelly arranged first and second walls that jointly extend to an opposite side;   a partition wall located between the first wall and the second wall;   a first nozzle airflow outlet located between the first wall edge of the second wall and the partition wall and configured as an opening for ejecting an airflow; and   a second nozzle airflow outlet located between the first wall edge of the first wall and the partition wall and configured as an opening for ejecting an airflow;   wherein the first wall edge of the second wall is folded in an annularly curved or bent manner to form a first Coanda surface adjacent to the first nozzle airflow outlet and capable of producing the Coanda effect, and the partition wall is folded either inward in an opposite direction of an airflow direction or outward in the airflow direction in an annularly curved or bent manner to form a closed wall, the closed wall forming a second Coanda surface adjacent to the second nozzle airflow outlet and capable of producing the Coanda effect.   
     
     
         2 . The fan of  claim 1 , wherein the second wall edges form a closed side for preventing an outgoing airflow or an opening that allows passage of an airflow. 
     
     
         3 . The fan of  claim 1 , wherein the second wall is folded inward in the opposite direction of the airflow direction in an annularly curved or bent manner to form a closed wall for preventing an ingoing airflow, or the second wall is folded outward in the airflow direction in an annularly curved or bent manner to form the first Coanda surface adjacent to the first nozzle airflow outlet and capable of producing the Coanda effect. 
     
     
         4 . The fan of  claim 1 , wherein the second wall end is joined with the first wall end to form an annular hollow portion, and the annular hollow portion encircles a central hollow portion that allows passage of light and an airflow. 
     
     
         5 . The fan of  claim 1 , wherein the second wall end has a second tightly closing wall for preventing passage of an airflow, and the first wall end has a first tightly closing wall for preventing passage of an airflow. 
     
     
         6 . The fan of  claim 1 , wherein there is one said nozzle airflow inlet, provided at the first wall or the second wall; or there are a plurality of said nozzle airflow inlets, provided at the first wall or the second wall. 
     
     
         7 . The fan of  claim 1 , wherein the second nozzle airflow outlet formed between the first wall edge of the first wall and the partition wall is a tapered slit, and the first nozzle airflow outlet formed between the first wall edge of the second wall and the partition wall is a tapered slit. 
     
     
         8 . The fan of  claim 1 , wherein the second nozzle airflow outlet formed between the first wall edge of the first wall and the partition wall is a rectangular slit, and the first nozzle airflow outlet formed between the first wall edge of the second wall and the partition wall is a rectangular slit. 
     
     
         9 . The fan of  claim 1 , wherein the first nozzle airflow outlet or the second nozzle airflow outlet is divided into a plurality of spaces by a plurality of partition plates. 
     
     
         10 . The fan of  claim 1 , wherein there are a plurality of said partition walls so as to form a plurality of said second Coanda surfaces as well as a plurality of said second nozzle airflow outlets. 
     
     
         11 . The fan of  claim 1 , wherein the second wall has a diffusion surface for guiding an airflow in a predetermined direction. 
     
     
         12 . The fan of  claim 1 , wherein the second wall edge of the first wall is folded in an annularly curved or bent manner to form a third tightly closing wall, and the third tightly closing wall is adhesively attached to the second wall to prevent an outgoing airflow. 
     
     
         13 . The fan of  claim 1 , wherein the second wall edge of the second wall is folded in an annularly curved or bent manner to form a third tightly closing wall, and the third tightly closing wall is adhesively attached to the first wall to prevent an outgoing airflow. 
     
     
         14 . The fan of  claim 1 , wherein the nozzle includes a third tightly closing wall, and the third tightly closing wall has two sides adhesively attached to the first wall and the second wall respectively to prevent an outgoing airflow. 
     
     
         15 . The fan of  claim 1 , wherein the base has an internal fan for taking in air and ejecting an airflow, a base airflow inlet for taking in air, and a base airflow outlet for ejecting an airflow. 
     
     
         16 . The fan of  claim 15 , wherein the internal fan is a forced-draft fan, a planar fan, or a jet turbine-blade fan. 
     
     
         17 . The fan of  claim 15 , wherein the internal fan is a plurality of parallel-connected or series-connected planar fans. 
     
     
         18 . The fan of  claim 1 , wherein the base comprises a filter screen provided therein.