Furnace blower with double sided impeller

A blower for a furnace, the blower comprising:

• a blower motor including a motor casing and a motor shaft with a rotation axis, the motor casing having an inlet and an outlet;
• a blower housing having generally circular first and second side walls with an annular wall extending between the first and second side walls to form the blower housing, the blower housing having an impeller rotatably disposed within the blower housing and operably connected to the motor shaft, the second side wall having a primary intake into the blower housing that is connected in communication with a combustion chamber of the furnace, the first side wall supporting the blower motor and having a shaft hole for receiving the motor shaft therethrough, the first side wall being spaced from the motor shaft, the shaft hole being in communication with the outlet of the motor casing, whereby the impeller draws cooling air from the aligned shaft hole and outlet when the impeller is rotated by the motor;
• the impeller having 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 extending axially outward from opposite sides of the back plate;
• the blades of the first set of blades having a smaller axial length than the blades of the second set of blades;
• the impeller back plate dividing the impeller into a first portion and a second portion, the first portion drawing cooling air through the motor casing from the aligned shaft hole and outlet of the motor casing into the blower housing and the second portion drawing furnace combustion products from the combustion chamber through the primary intake of the blower housing when the impeller is rotated by the motor;
• and
• the blower housing is shaped as a volute that causes the cooling air and the furnace combustion products to be mixed in the blower housing when the impeller is rotated by the motor, whereby a temperature of the furnace combustion products is lowered by the cooling air.

A blower comprising:

• a blower motor including a motor casing and a motor shaft with a rotation axis, the motor casing having an inlet and an outlet;
• and
• a blower housing having generally circular first and second side walls with an annular wall extending between the first and second side walls to form the blower housing, the blower housing having an impeller rotatably disposed within the blower housing and operably connected to the motor shaft, the second side wall having a primary intake into the blower housing, the first side wall supporting the blower motor and having a shaft hole for receiving the motor shaft therethrough, the first side wall being spaced from the motor shaft, the shaft hole being in communication with the outlet of the motor casing, whereby the impeller draws cooling air into the blower housing through the motor casing from the aligned shaft hole and outlet when the impeller is rotated by the motor;
• and
• the impeller having 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 set of blades are smaller than the blades of the second set of blades, and the blades are fixed to the impeller back plate.

A blower comprising:

• a motor having a shaft;
• an impeller housing operatively connected to the motor;
• an impeller contained in the impeller housing and mounted on the motor shaft, the impeller having a circular back plate with a center axis, 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 an axially 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;
• and
• the first and second sets of blades have axial lengths and the axial length of the first set of blades is smaller than the axial length of the second set of blades.