Blower scroll having an aspirator venturi

Abstract

A blower assembly for use with an HVAC module is provided. The blower assembly includes a scroll or volute shaped housing having an air inlet in a wall of the housing for receiving air to be blown by an impeller, and an air outlet from which the blown air passes from the housing. A blower wheel is secured to a rotatable motor-driven shaft extending along a central axis of the air inlet. At least one venture is provided adjacent to the air inlet of the housing, the at least one venturi connectable to an aspirator that is in fluid communication with a sensor unit. Wherein, during operation, the blower wheel pulls air both through the air inlet to the housing and through the at least one venturi.

1 . A blower assembly for use with an HVAC module, the blower assembly comprising:
 a scroll or volute shaped housing, the housing having an air inlet in a wall of the housing configured to receive air to be blown by an impeller, and an air outlet from which the blown air passes from the housing;   a blower wheel secured to a rotatable motor-driven shaft extending along a central axis of the air inlet; and   at least one venturi adjacent to the air inlet of the housing, the at least one venturi connectable to an aspirator that is in fluid communication with a sensor unit,   wherein, during operation, the blower wheel pulls air both through the air inlet to the housing and through the at least one venturi.   
     
     
         2 . The blower assembly according to  claim 1 , further comprising a separate outer air chamber circumferentially positioned about the air inlet, the outer air chamber having an inlet connected to an aspirator. 
     
     
         3 . The blower assembly according to  claim 2 , wherein the venturi comprises a circumferential slit in the outer air chamber adjacent the air inlet. 
     
     
         4 . The blower assembly according to  claim 2 , wherein the outer air chamber includes multiple venturis adjacent to the air inlet. 
     
     
         5 . The blower assembly according to  claim 1 , comprising a single venturi located adjacent to the air inlet. 
     
     
         6 . The blower assembly according to  claim 1 , comprising multiple venturis located adjacent to the air inlet, each being connected to a different aspirator.