Patent ID: 9186954
Filing Date: 2015-11-17
Classification: B60H,F04D

Abstract:
1. A blower unit having a two-layer construction that is able to intake an outside air out of a passenger compartment of a vehicle and an inside air in the passenger compartment dividedly, the blower unit comprising: a scroll casing having a first intake port and a second intake port that intake at least one of the outside air and the inside air, the scroll casing defining a first air passage through which the air taken from the first intake port passes and a second air passage through which the air taken from the second intake port passes; a centrifugal first fan arranged in the first air passage so as to draw the air flowing from the first intake port; a centrifugal second fan coaxially arranged with the first fan, the second fan being arranged in the second air passage so as to draw the air flowing from the second intake port; a fan motor having a main body and a rotation shaft driven by the main body, a first end of the rotation shaft being connected to each of the first fan and the second fan, a second end of the rotation shaft being connected to the main body; a boss part to which the rotation shaft is fitted; a cylindrical member arranged on an inner side of the one of the first intake port and the second intake port of the scroll casing, the cylindrical member extending in a direction of a rotational axis of the rotation shaft so as to cover the rotation shaft; and a blower cover arranged to face and cover one of the first intake port and the second intake port, wherein the fan motor is fixed to the blower cover at a position facing the one of the first intake port and the second intake port; the cylindrical member has a first axial end that is located adjacent to the first end of the rotation shaft, the first axial end is branched at a branch part to at least an internal cylindrical part and an external cylindrical part that surrounds the internal cylindrical part, and the internal cylindrical part and the external cylindrical part extend from the branch part in the direction of the rotational axis of the rotation shaft.