Motorized fan unit for a motor vehicle

Abstract

The invention relates to a motorized fan unit for a motor vehicle, comprising a motor (2), a fan (3) for moving an air flow (F) that is configured to be controlled by the motor (2), and a control module (4) for controlling said motor (2), the control module (4) comprising an electronic card, the motorized fan unit delimiting a main air-flow circulation duct (5) and a cooling duct (6) configured to cool said electronic card of the control module, the duct (6) comprising an inlet (7) provided with a deflector (8) for diverting a portion of the air flow into the duct (6), the deflector (8) being mounted movably according to an air flow rate in the main duct for the purpose of increasing an air flow rate in the cooling duct (6) with the speed of the air flow in the main duct (5).

1 . A motorized fan unit for motor vehicle, comprising:
 a motor;   a fan for setting in motion an air flow and configured to be controlled by the motor; and   a control module for controlling said motor comprising an electronic board,   the motorized fan unit delimiting a first circulation duct for the air flow set in motion by the fan, referred to as the main duct, and a secondary air flow duct, referred to as cooling duct, configured to cool said electronic board of the control module, the cooling duct comprising an inlet equipped with a deflector for diverting part of the air flow set in motion by the fan into the cooling duct,   the deflector being mounted with the ability to move according to a flow rate of air in the main duct in a direction for increasing a flow rate of air in the cooling duct with a velocity of the air flow in the main duct.   
     
     
         2 . The motorized fan unit as claimed in  claim 1 , wherein a gradient along which the flow rate of air in the cooling duct increases as a function of the velocity of the air flow in the main duct is a strictly increasing gradient. 
     
     
         3 . The motorized fan unit as claimed in  claim 1 , wherein the deflector is positioned in the main duct, outside of the cooling duct. 
     
     
         4 . The motorized fan unit as claimed in  claim 1 , wherein the deflector is mounted with the ability to pivot. 
     
     
         5 . The motorized fan unit as claimed in  claim 4 , wherein the axis of pivoting of the deflector extends in a radial direction of the motorized fan unit. 
     
     
         6 . The motorized fan unit as claimed in  claim 1 , wherein the deflector comprises a curved deflection surface. 
     
     
         7 . The motorized fan unit as claimed in  claim 1 , wherein the deflector is made from a flexible material, notably an HPPE polymer. 
     
     
         8 . The motorized fan unit as claimed in  claim 1 , comprising at least one low wall extending in the main duct and bordering the inlet to the cooling duct. 
     
     
         9 . The motorized fan unit as claimed in  claim 1 , wherein the cooling duct is configured to also cool the motor. 
     
     
         10 . A heating, ventilation and/or air conditioning device for a motor vehicle, comprising a motorized fan unit as claimed in  claim 1 .