Dual fan coaxial flow blower housing assembly

Abstract

A blower assembly including a housing for a first scroll fan and a second scroll fan that are connected by a shaft to a motor that rotates the fans. The first and second scroll fans are coaxially mounted on the shaft. Fresh air ports and recirculated air ports are provided for the circulation of fresh air and recirculated air, respectively. The fresh air ports and recirculated air ports may be selectively opened and closed by doors to control the flow of air from the outside and from the passenger compartment as controlled by the HVAC system.

What is claimed is: 
     
         1 . A HVAC blower assembly comprising:
 a housing;   a motor assembled to the housing;   a first fan and a second fan operatively connected to the motor, the first fan and the second fan being coaxially aligned to draw air from a first inlet and a second inlet, respectively; and   an outlet that receives the air from the first fan and the second fan and passes the air to a passenger compartment.   
     
     
         2 . The assembly of  claim 1  further comprising:
 a shaft that is driven by the motor and extends from first and second opposite ends of the motor, and wherein the first fan is connected to a first end of the shaft and the second fan is connected to a second end of the shaft. 
 
     
     
         3 . The assembly of  claim 2  wherein the housing further comprises a first air inlet that the first fan draws air into the housing, and a second air inlet that the second fan draws air into the housing. 
     
     
         4 . The assembly of  claim 3  wherein the first fan draws air including recirculated air from the passenger compartment and fresh air from outside of the passenger compartment. 
     
     
         5 . The assembly of  claim 1  wherein the first fan draws air including recirculated air from the passenger compartment and fresh air from outside of the passenger compartment. 
     
     
         6 . The assembly of  claim 1  wherein the second fan draws air including recirculated air from the passenger compartment and fresh air from outside of the passenger compartment. 
     
     
         7 . The assembly of  claim 1  wherein the first fan and the second fan are coaxially aligned in a vertical orientation. 
     
     
         8 . The assembly of  claim 1  wherein the first fan and the second fan are coaxially aligned in a horizontal orientation. 
     
     
         9 . The assembly of  claim 1  wherein the first fan and the second fan are coaxially aligned in an angular orientation that is between vertical and horizontal. 
     
     
         10 . A HVAC blower assembly comprising:
 a housing that defines a first opening and a second opening;   a motor disposed within the housing;   a first blower scroll fan operatively connected to the motor that draws air through the first opening;   a second blower scroll fan operatively connected to the motor that draws air through the second opening;   a first closure member that controls air flowing through the first opening by controlling a first volume of air from a fresh air source and a second volume of air from a passenger compartment; and   a second closure member that controls air flowing through the second opening from the passenger compartment.   
     
     
         11 . The assembly of  claim 10  wherein the second closure member controls air flowing through the second opening from the fresh air source. 
     
     
         12 . The assembly of  claim 11  further comprising:
 an outside air vent that provides air from the fresh air source to both the first opening and second opening. 
 
     
     
         13 . The assembly of  claim 12  further comprising a fresh air duct provided on the housing that extending from the first opening to the second opening to provide fresh air to the second opening. 
     
     
         14 . The assembly of  claim 11  further comprising:
 a first outside air vent that provides air from the fresh air source to the first opening; and 
 a second outside air vent that provides air from the fresh air source to the second opening. 
 
     
     
         15 . The assembly of  claim 10  further comprising:
 a plurality of ribs formed inside the housing for supporting the motor and the first blower scroll fan and the second blower scroll fan within the housing. 
 
     
     
         16 . The assembly of  claim 10  further comprising:
 a plurality of acoustic air flow ribs formed inside the housing in an air outlet from the housing that also include a motor mount. 
 
     
     
         17 . The assembly of  claim 10  further comprising:
 a shaft that is driven by the motor and extends from first and second opposite ends of the motor, and wherein the first blower scroll fan is connected to a first end of the shaft and the second blower scroll fan is connected to a second end of the shaft. 
 
     
     
         18 . The assembly of  claim 10  further comprising:
 an outlet that receives the air from the first blower scroll fan and the second blower scroll fan and passes the air to a passenger compartment.