Can you reverse a squirrel cage fan?
Nope.. Brushless DC motors of the type used in a blower like that only spin in one direction. Also, you can’t run a squirrel-cage blower backwards and expect it to reverse the airflow direction.
What direction should a squirrel cage fan run?
The fan wheel rotates clockwise or counter-clockwise, with the small forward-curved blades scooping the airflow and slinging it out as the wheel rotates. It is designed to move high-volume airflow with very little static pressure.
What is a backward inclined fan?
Backward inclined fan are used for clean-air applications to move high volumes of air at a variety of static pressures, such as in dust-collection systems. This centrifugal fan is offered in belt-driven, direct-driven, and direct-coupled arrangements along with various impeller and housing widths.
What is backward inclined blade?
The backward inclined fan (backward inclined blower) is highly efficient because it has simple, flat, backward inclined blades that minimize interference with the airflow as the air moves through the fan. Finally, this fan is suited for clean air and/or high-temperature applications.
What must be interchanged to reverse the rotation of a squirrel cage motor?
To reverse the rotation of the induction motor , we need to change its rotating magnetic field direction . By means if it’s clockwise then we need to change it to counter/anti clockwise.
Which way should a centrifugal fan turn?
In these examples, the correct direction of rotation is clockwise as viewing the fans from the inlet side (as shown currently in the Figs). Using these fans in the opposite direction from that shown here will result in an increase in the fan’s power consumption, fan noise and also the air volume it moves. Fig.
Why do they call it a squirrel cage fan?
A squirrel cage blower, also known as a centrifugal blower, is used to move air and gases in a variety of applications. This equipment is so named since its construction looks similar to that of a hamster wheel. Squirrel fans are known for their superior energy efficiency compared to other types of blowers.
What is the difference between backward and forward curved fans?
The difference in flow direction between a forward and backward curved centrifugal fan is the direction that the air exits the impeller circumference. With a backward curved impeller, the air exits in a radial direction whereas with a forward curved the air exits tangentially from the circumference of the fan.
What is a backward inclined centrifugal fan?
Backward Inclined Fans The backward inclined centrifugal fans offer three standard blade types – flat single thickness, curved single thickness and curved airfoil. The blades are generally heavier and larger than forward curved and move away from the direction of wheel rotation. They produce relatively medium to high airflow at static pressures.
What type of fan is used in a squirrel cage?
See Figure 2 below for a picture of this fan type. Forward Curve- Sometimes referred to as a “squirrel cage” fan, forward curve fans are used in most residential and light commercial HVAC equipment. These fans are for low to medium static applications.
What is a squirrel cage blower wheel?
What some may call a squirrel cage blower wheel is also what we call a forward-curved centrifugal fan. Either way, it gets its name based on the many small blades that make up this fan wheel causing it to look like a squirrel cage or hamster wheel!
What is the difference between backward curved and airfoil fans?
Backward Curved- these wheels are extremely efficient, more robustly built, and very quiet. They are more expensive to build than FC and BI fans. Airfoil- these blades are shaped like that of an airplane wing and offer slightly higher efficiencies and lower noise levels than BC fans, however are more expensive to build.