Motor fan

Abstract

A motor fan 1 of the present invention includes: an impeller 7 b that forms an air flow; an electric motor 6 that rotationally drives the impeller 7 b; a shroud 10 including a cylindrical casing 16 that covers an outer periphery of the impeller 7 b, and through which the air flow passes, and a base 11 that projects from a periphery of the casing 16; a control unit 40 that controls rotation of the electric motor 6 and is arranged on a discharge side of the base 11; and a heat sink 50 that dissipates heat from heat dissipation pins 52 to suppress heat generation of the control unit 40, wherein the heat dissipation pins 52 are exposed on a suction side in the heat sink 50.

1 . A motor fan comprising:
 an impeller that forms a first air flow from a suction side toward a discharge side that is a back side of the suction side;   an electric motor that rotationally drives the impeller;   a shroud including   a cylindrical casing that covers an outer periphery of the impeller, and through which the air flow passes, and   a base that projects from a periphery of the casing; and   a controller that is arranged on the discharge side of the base, controls rotation of the electric motor, and includes a heat generating element;   a heat dissipater that includes:   a flat plate-like sink body;   a plurality of heat dissipation pins provided on a first surface side of the sink body; and   a heat transfer projection provided on a second surface side of the sink body;   wherein a heat dissipater that is at least partially exposed on the suction side, and is thermally coupled to the heat generating element suppresses a temperature rise of the heat generating element.   
     
     
         2 . The motor fan according to  claim 1 ,
 wherein the heat dissipater is exposed on the suction side via a through window that is formed in the base corresponding to the controller.   
     
     
         3 . The motor fan according to  claim 1 ,
 wherein the heat dissipater is arranged only on the suction side of the base, and   is thermally connected to the heat generating element of the controller via a heat transfer body that penetrates the base.   
     
     
         4 . The motor fan according to  claim 1 ,
 wherein the heat dissipater is formed integrally with the shroud.   
     
     
         5 . The motor fan according to  claim 1 ,
 wherein the shroud includes a heat dissipater accommodation chamber that is retracted toward the discharge side with respect to the base, and   the heat dissipater is accommodated within the heat dissipater accommodation chamber.   
     
     
         6 . The motor fan according to  claim 1 ,
 wherein the heat generating element is a switching device.   
     
     
         7 . The motor fan according to  claim 1 ,
 wherein the heat dissipater includes a plurality of heat dissipation pins.   
     
     
         8 . (canceled) 
     
     
         9 . The motor fan according to  claim 1 ,
 wherein the heat dissipater is integrally formed by casting aluminum alloy.