Patent ID: 8267674
Filing Date: 2012-09-18
Classification: F04D

Abstract:
1. A motor housing for use with a centrifugal blower assembly, the motor housing comprising: a motor support portion defining a central axis, and tangential and radial directions with respect to the central axis, the motor support portion including a first end and a second end; a first wall surrounding the motor support portion; a surface offset from the first wall toward the second end in a direction parallel with the central axis; a cooling air passageway oriented generally parallel with the central axis and offset from the central axis, the cooling air passageway directing an airflow to the motor to cool the motor; a second wall disposed radially outwardly of the first wall and oriented substantially normal to the first wall, at least a portion of the second wall deviating radially inwardly toward the central axis to define, in conjunction with the surface, an inlet path along which the airflow in the tangential direction may be directed, the inlet path widening in the tangential direction; and an inlet opening directly into the cooling air passageway and being at least partially defined between the first wall and the surface, the inlet extending in a direction parallel with the central axis, the inlet having a first side coinciding with an end of the inlet path through which the airflow in the tangential direction may directly enter the cooling air passageway, and the inlet having a second side generally perpendicular to the first side through which the airflow in the radial direction may directly enter the cooling air passageway.