초록 ▼

A blower for a furnace is provided where the blower has an impeller that is configured to create a primary air flow of combustion air into the blower housing and a secondary air flow of cooling air through the blower motor. The primary air flow of combustion air into the furnace generates hot exhaus

A blower for a furnace is provided where the blower has an impeller that is configured to create a primary air flow of combustion air into the blower housing and a secondary air flow of cooling air through the blower motor. The primary air flow of combustion air into the furnace generates hot exhaust gases for a heat exchanger in the furnace. The secondary air flow cools the blower motor. The secondary air flow is mixed with the hot exhaust gases in the blower housing and cools the exhaust gases before being discharged from the blower housing.

대표청구항 ▼

[ What is claimed is:] [1.]1. A furnace comprising:a vestibule for accumulating incoming air for combustion in the furnace;a motor having a motor shaft with a rotation axis and a motor casing surrounding the motor, the motor casing having at least one motor casing opening;a blower housing containing

[ What is claimed is:] [1.]1. A furnace comprising:a vestibule for accumulating incoming air for combustion in the furnace;a motor having a motor shaft with a rotation axis and a motor casing surrounding the motor, the motor casing having at least one motor casing opening;a blower housing containing an impeller connected to the motor shaft for rotation with the motor shaft to draw air into the vestibule, the blower housing including a shaft hole for receiving the motor shaft therethrough, the shaft hole being aligned with the motor casing opening, whereby the motor casing is in communication with an interior of the blower housing and the impeller draws cooling air into the blower housing from the motor casing for cooling the motor and motor casing;the impeller has a circular back plate fixed on the motor shaft, a first set of blades arranged in a circular pattern on one side of the back plate and a second set of blades arranged in a circular pattern on the opposite side of the back plate, the blades of the first and second sets are fixed to the back plate and extend axially outward from opposite sides of the back plate; andthe blades of the first set of blades have a smaller axial length than the blades of the second set of blades.