Air circulation fan used in light steel frame

Abstract

An air circulation fan used in a light steel frame includes a top base, a circuit assembly, a shroud, a driving source, and a blade set. A pivoting portion of the shroud is pivotally connected to a combining portion of the top base, so that the shroud can pivotally hung on the top base. When the shroud is combined with the top base, the two connecting portions of the shroud are inserted into two through-holes of an accommodating casing with a second elastic piece of each through-hole abutting against a first elastic piece of each combining portion, thereby electrically connecting the circuit assembly to the driving source. When the shroud is separated from the top base, the connecting portions are removed from the through-holes with the second elastic piece being separated from the first elastic piece, thereby shutting off the electrical connection between the circuit assembly and the driving source.

What is claimed is: 
     
         1 . An air circulation fan used in a light steel frame, including:
 a top base having a main body, a combining portion provided on one side of the main body, a hooking piece provided on the other side of the main body opposite to the combining portion, and an accommodating casing provided inside the main body, the accommodating casing being provided with two through-holes each having a first elastic piece of electrical conductivity;   a circuit assembly provided in the accommodating casing of the top base for electrically connecting an external power source to the first elastic piece;   a shroud having a covering body, a pivoting portion provided on one side of the covering body, an insertion trough provided on the other side of the covering body opposite to the pivoting portion, and two connecting portions provided in the covering body each having a second elastic piece of electrical conductivity;   a driving source provided between the top base and the shroud and electrically connected to the second elastic piece of the shroud; and   a blade set provided inside the main body of the top base and coupled to the driving source, the blade set being driven by the driving source to rotate in situ;   wherein the pivoting portion is pivotally connected to the combining portion, so that the shroud can be pivotally hung on the top base;   when the shroud is combined with the top base, the connecting portion is inserted into the through-hole of the accommodating casing with the second elastic piece abutting against the first elastic piece, thereby electrically connecting the circuit assembly to the driving source;   when the shroud is separated from the top base, the connecting portion is removed from the through-hole with the second elastic piece being separated from the first elastic piece, thereby shutting off the electrical connection between the circuit assembly and the driving source.   
     
     
         2 . The air circulation fan used in a light steel frame according to  claim 1 , wherein the combining portion is integrally formed on a side edge of the main body, the interior of the combining portion has a pivoting space, the top of the combining portion has an inlet in communication with the pivoting space and the outside, one side of the combining portion has a hanging port in communication with the pivoting space and the inlet, the size of the hanging port is smaller than the size of the inlet, the pivoting portion of the shroud is integrally formed on a side edge of the covering body, the pivoting portion has a supporting arm and a pivotal shaft connected to a distal end of the supporting arm, the pivotal shaft is vertically connected to the supporting arm, both ends of the pivotal shaft protrude from two opposite sides of the supporting arm, the pivotal shaft of the pivoting portion is disposed into the pivoting space and the inlet to thereby pivotally rotate in the pivoting space, the supporting arm protrudes out of the hanging port. 
     
     
         3 . The air circulation fan used in a light steel frame according to  claim 2 , wherein the axial length of the pivotal shaft is smaller than the size of the inlet but larger than the size of the hanging port. 
     
     
         4 . The air circulation fan used in a light steel frame according to  claim 1 , wherein an end of each first elastic piece adjacent to the through-hole is bent to form an inclined surface. 
     
     
         5 . The air circulation fan used in a light steel frame according to  claim 1 , wherein the top end of each second elastic piece is bent to cover the top of the connecting portion. 
     
     
         6 . The air circulation fan used in a light steel frame according to  claim 1 , wherein the driving source has a fan motor and a synchronous motor, the fan motor is provided at a central position in the main body to be connected to the blade set, the synchronous motor is provided in a central position in the covering body, both the fan motor and the synchronous motor are electrically connected to the second elastic piece. 
     
     
         7 . The air circulation fan used in a light steel frame according to  claim 6 , further including a rotating disk combined with the synchronous motor and located in a central position in the covering body, the rotating disk being driven by the synchronous motor to rotate in situ. 
     
     
         8 . The air circulation fan used in a light steel frame according to  claim 1 , wherein the insertion trough is configured to allow the hooking piece to be inserted therein.