Reduced noise appliance
An appliance includes a reverse air flow motor housing. A casing carries and supports a motor, and a ventilation fan is rotated by a rotatable shaft driven by the motor. A lower platform with an air intake port carries a ventilation shroud that partially encloses the ventilation fan. An inner support is mounted between the lower platform and the casing. An outer housing has a sidewall that substantially encloses the motor and is supported by the lower platform. Rotation of the ventilation fan draws in ambient air through the air intake port which then proceeds between the casing and the motor and subsequently through the sidewall port.
1. A reverse air flow appliance, comprising:
a motor having a rotatable shaft;
a casing that carries and supports said motor;
a ventilation fan rotated by said rotatable shaft, said ventilation fan having a plurality of radial vanes with a fan aperture centrally positioned therein;
a lower platform which has a platform bottom separated from a platform base, wherein said platform base carries a fan shroud that partially encloses said ventilation fan, said fan shroud having a centrally disposed shroud opening aligned with said fan aperture, wherein said shroud opening faces said platform bottom, said lower platform having at least one air intake port;
a fan end plate mounted between said ventilation fan and said motor, said fan end plate having at least one plate aperture;
an inner support mounted between said lower platform and said casing; and
an outer housing substantially enclosing said motor and supported by said lower platform, said outer housing having at least one sidewall port,
wherein rotation of said ventilation fan draws in ambient air through said air intake port, through said centrally disposed shroud opening into said fan aperture, wherein said plurality of radial vanes expel the air radially whereupon the air passes through said at least one plate aperture into said casing which then proceeds between said casing and said motor and subsequently through said at least one sidewall port.
2. The reverse air flow appliance according to claim 1 , further comprising:
a brush bracket supported by said casing and holding one end of said motor;
an end bracket disposed at an opposite end of said motor; and
at least one fastener connecting said brush bracket, said casing and said end bracket to each other.
3. The reverse air flow appliance according to claim 2 , wherein said inner support and said outer housing form a chamber therebetween, wherein said sidewall port extends into said chamber.
4. The reverse air flow appliance according to claim 2 , wherein said end bracket has at least one bracket opening therethrough which passes air from between said casing and said motor to said sidewall port.
5. The reserve air flow appliance according to claim 4 , wherein said end bracket and said outer housing form a cavity therebetween, wherein air passes from said bracket opening into said cavity and then through said sidewall port.
6. The reverse air flow appliance according to claim 2 , wherein said end bracket and said outer housing form a cavity therebetween, wherein said inner support and said outer housing form a chamber therebetween such that said cavity is contiguous with said chamber.
7. The reverse air appliance according to claim 6 , wherein said end bracket has at least one bracket opening therethrough.
8. The reverse air flow appliance according to claim 7 , wherein air flows from said ventilation fan through said at least one plate aperture, between said casing and said motor, through said at least one bracket opening, said cavity, said chamber and out said at least one sidewall port.
9. The reverse air flow appliance according to claim 2 , wherein said rotatable shaft at an end opposite said ventilation fan provides a multi-sided ball adapted to drive a rotatable component.