AXIAL FAN BLOWER
A blower includes a power supply unit drivingly coupled to a fan assembly including a plurality of fan stages via an input shaft coupled to the fan stages. Each fan stage includes a housing, a plurality of stationary vanes, and a fan including blades extending radially away from a hub. The fan stages are non-identical, and include fans having varied characteristics such as hub diameter, blade length, axial blade width, blade twist, and/or blade orientation. For example, the diameter of the fan hubs may increase moving in a downstream direction. In addition, the fan assembly may be a stand-alone unit or attachment having an input shaft pro trading from the fan assembly that is configured to be coupled to a generic power supply unit for operating the fan assembly.
1 . A blower comprising:
a motor;
a main housing supporting the motor;
a fan assembly coupled to the main housing and operatively coupled to the motor, the fan assembly including
a first fan stage including a first housing section having a first plurality of stationary vanes and a first fan having a first plurality of blades extending radially outwardly from a first hub;
a second fan stage coupled to the first fan stage and including a second housing section having a second plurality of stationary vanes and a second fan having a second plurality of blades extending radially outwardly from a second hub, the second fan stage being different than the first fan stage;
an air inlet, defined at least partially within the main housing; and
a tapered air outlet that is coupled to the fan assembly.
2 . The blower of claim 1 , wherein a diameter of the first hub is smaller than a diameter of the second hub.
3 . The blower of claim 1 , wherein a length of each blade of the first plurality of blades is greater than a length of each blade of the second plurality of blades.
4 . The blower of claim 1 , wherein the first plurality of blades includes a first quantity of blades and the second plurality of blades includes a second quantity of blades that is different than the first quantity.
5 . The blower of claim 1 , wherein the first fan and the second fan are non-identical.
6 . The blower of claim 1 , wherein each blade of the first fan and the second fan includes a blade length, an blade width, a blade twist, and a blade pitch, and wherein at least one of the group consisting of the blade length, the blade width, the blade twist, and the blade pitch are different on the first fan and the second fan.
7 . A blower attachment comprising:
an input shaft rotatable about an axis;
a fan assembly operatively coupled to the input shaft, the fan assembly including:
a first fan stage including a housing section having a first plurality of stationary vanes and a first fan having a first plurality of blades extending radially outwardly from a first hub;
a second fan stage coupled to the first fan stage and including a housing section having a second plurality of stationary vanes and a second fan having a second plurality of blades extending radially outwardly from a second hub, the second fan stage being non-identical to the first fan stage;
a tapered air outlet that is coupled to the fan assembly.
8 . The blower of claim 7 , wherein a diameter of the first hub is smaller than a diameter of the second hub.
9 . The blower of claim 7 , wherein a length of each blade of the first plurality of blades is greater than a length of each blade of the second plurality of blades.
10 . The blower of claim 7 , wherein the first plurality of blades includes a first quantity of blades and the second plurality of blades includes a second quantity of blades that is different than the first quantity.
11 . The blower of claim 7 , wherein the first fan and the second fan are non-identical.
12 . The blower of claim 7 , wherein each blade of the first fan and the second fan each include a blade length, an blade width, a blade twist, and a blade pitch, and wherein at least one of the group consisting of the blade length, the blade width, the blade twist, and the blade pitch are different on the first fan and the second fan.
13 . A blower comprising:
a motor;
a main housing supporting the motor and at least partially defining an air inlet;
a fan assembly coupled to the main housing downstream from the air inlet and operatively coupled to the motor, the fan assembly including
a first fan stage including a first housing section coupled to the main housing and having a first plurality of stationary vanes and a first fan having a first plurality of blades extending radially outwardly from a first hub;
a second fan stage coupled to the first fan stage and including a second housing section having a second plurality of stationary vanes and a second fan having a second plurality of blades extending radially outwardly from a second hub;
a third fan stage coupled to the second fan stage and including a third housing section having a third plurality of stationary vanes and a third fan having a third plurality of blades extending radially outwardly from a third hub;
wherein the first fan, the second fan, and the third fan are non-identical;
a tapered air outlet disposed downstream from the fan assembly.
14 . The blower of claim 13 , wherein a diameter of the third hub is greater than a diameter of the second hub and a diameter of the first hub.
15 . The blower of claim 14 , wherein the diameter of the second hub is greater than the diameter of the first hub.
16 . The blower of claim 13 , wherein the third plurality of blades includes a third quantity of blades, the second plurality of blades includes a second quantity of blades, and the first plurality of blades includes a first quantity of blades, and the third quantity of blades is greater than each of the second quantity of blades and the first quantity of blades.
17 . The blower of claim 16 , wherein the second quantity of blades is greater than the first quantity of blades.
18 . The blower of claim 13 , wherein the first housing section, the second housing section, and the third housing section each have approximately the same diameter.
19 . The blower of claim 13 , wherein an axial width of each blade of the first plurality of blades is greater than an axial width of each blade of the second plurality of blades and the third plurality of blades.
20 . The blower of claim 13 , wherein each of the first plurality of blades has an orientation that is different than the second plurality of blades and the third plurality of blades.