Seat air conditioning unit

Abstract

In a seat air conditioning unit, a first blower is mounted to a seat cushion and a second blower is mounted to a seat back such that a suction port of the second blower is located on a rear side of the seat back. A duct is provided for leading air blown by the first blower toward the suction port of the second blower. Further, a Peltier module is provided in the duct. A first end of the duct is connected to a discharge portion of the first blower and a second end of the duct defines a duct opening. The duct opening is disposed to open at a position adjacent to the suction port so that a volume of air sucked in the suction port is larger than a volume of air discharged from the duct opening toward the suction port.

1 . A seat air conditioning unit for blowing air from a surface of a seat cushion and a surface of a seat back, the seat air conditioning unit comprising: 
 a first blower mounted to the seat cushion for blowing air to the surface of the seat cushion through an opening formed on the seat cushion;    a second blower defining a suction port, the second blower mounted to the seat back so that the suction port is open on a rear side of the seat back and air sucked in the suction port is blown to the surface of the seat back through an opening formed on the seat back;    a duct having a first end and a second end, the first end connected to a discharge portion of the first blower and the second end disposed adjacent to the suction port of the second blower for introducing air blown by the first blower toward the second blower; and    a Peltier module disposed in the duct, wherein    the second end of the duct defines a duct opening, and the duct opening is disposed adjacent to the suction port of the second blower such that a volume of air sucked in the suction port is larger than a volume of air discharged from the duct opening toward the suction port.    
   
   
       2 . The seat air conditioning unit according to  claim 1- , further comprising: 
 a guide member disposed adjacent to the suction port of the second blower for leading air from the duct opening toward the suction port.    
   
   
       3 . The seat air conditioning unit according to  claim 2 , further comprising: 
 a back board mounted to the rear side of the seat back to surround the suction port of the second blower and the second end of the duct, wherein the guide member is provided on a wall of the back board that faces the rear side of the seat back.    
   
   
       4 . The seat air conditioning unit according to  claim 1 , further comprising a door disposed in the duct for controlling a flow rate of air in the duct.  
   
   
       5 . The seat air conditioning unit according to  claim 4 , further comprising: 
 a control unit that controls an electric current supply to the Peltier module and an operation of the door and determines whether a predetermined operation is necessary, wherein    when it is determined that the predetermined operation is necessary, the door is operated to a fully open position to allow air to flow in the duct and an electric current is supplied to the Peltier module.    
   
   
       6 . The seat air conditioning unit according to  claim 5. , wherein when it is determined that the predetermined operation is unnecessary, the door is operated to a fully closed position to close the duct and the electric current supply to the Peltier module is stopped.  
   
   
       7 . The seat air conditioning unit according to  claim 5 , wherein the predetermined operation is a cool down operation for blowing air having a cooling effect to the surface of the seat back.  
   
   
       8 . The seat air conditioning unit according to  claim 1 , further comprising: 
 another Peltier module disposed between the discharge portion of the first blower and the opening of the seat cushion.    
   
   
       9 . The seat air conditioning unit according to  claim 1;  further comprising: 
 a back board mounted to the rear side of the seat back, wherein    the back board defines a space with the rear side of the seat back and the duct opening is open in the space, and    the back board further defines an opening so that air around the seat back and the back board is introduced in the space.    
   
   
       10 . The seat air conditioning unit according to  claim 2 , wherein the guide member extends from at least one of an end of the suction port and the second end of the duct.  
   
   
       11 . An air conditioning unit for a seat, comprising: 
 a blower mounted to a seat back of the seat such that a suction port thereof is located on a rear side of the seat back;    a duct disposed on the rear side of the seat back, the duct having a first end for introducing air therein and a second end defining a duct opening at a position adjacent to the suction port of the blower;    a Peltier module disposed in the duct; and    a back board mounted to the rear side of the seat back, wherein the back board defines a space with the rear side of the seat back and an opening to allow air to flow in the space, and    the suction port and the duct opening are open in the space.