PEDESTAL FAN WITH TWO SIDE BLADES Submitted By Padmanaban. S Praveen kumar. T Samuel Frank Saravanathamizhan. S SUPERVISED BY Mr. L.C.GOKUL, M.E., Asst.prof.
ABSTRACT In ordinary pedestal fan a single blade is used to deliver the air and only one side of shaft is connected with the blade which rotates in clockwise direction. Our project mainly focuses on increasing the delivery of the air with low power consumption. Since it delivers air at two portions simultaneously, it requires a minimum space where two fans has to be used. By this simple modification it can be installed in industries to deliver two opposite sides of air at once. With the slight modification, we have increased the discharge by 80% when compared when an ordinary pump.
CONTENT Introduction Objectives Methodology Component diagram Bill of material Fabrication work Working principle Cost of the project Advantage Disadvantage Application Future scope Conclusion References Photographic view
INTRODUCTION Fans are widely used in industrial and commercial applications. From shop ventilation to material handling to boiler applications, fans are critical for process support and human health. Primary air moving devices used in industrial applications In the commercial sector, electricity needed to operate fan motors composes a large portion of the energy costs for space conditioning.
OBJECTIVES • This project is about pedestal fan with double side blades. • we are providing two side blades opposite with each other instead of single blade. • This will give a double side air delivery with a single motor. • Compare to the ordinary pedestal fan the delivery amount of air by the fan is increased.
Laws of Fan • Fan rotational speed is typically measured in revolutions per minute (rpm). • Fan rotational speed has a significant impact on fan performance, as shown by the following fan laws: • Airflow final = Airflow initial×(RPM initial/RPM final) • Pressure final = Pressure initial×(RPM initial/RPM final) 2 • Power final = Power initial × (RPM initial/RPM final) 3
Parts of pedestal fan • Shaft • Blades • Protective covers • Bearing • Speed regulator • Motor casing • Copper coil • Pipes • Coupling • Direction controller • Locking nut • Blades • Top locking clip • Side locking clip • Safety grille • Tilt adjustable • 3 Speed switches
Effects of modification • Rotational speed must be considered concurrently with other issues, such as; • variation in the fan load • air stream temperature • ambient noise • mechanical strength of the fan.
FABRICATION The electric motor is connected with both ends of the shaft. we already machined is fitted inside the motor by welding. After that the blade is connected to the ends of the shaft. We extend the shaft from the motor to provide a second blade at another side of the motor. We are providing two side blades opposite with each other instead of single blade. We are changing the blade angles and direction.
WORKING PRINCIPLE BLADE ANGLE We change the angle of the blade to degree ‘α’ angle We increase the blade angle to get maximum air delivery and also increase the number of wings to four. Thus increasing performance of pedestal fan to high air delivery with minimum power consumption. INDUCTION MOTOR The current comes in the white wire, then the first winding (top right) is clockwise, the next one (bottom right) is anticlockwise, bottom left is clockwise again, top left is anticlockwise, then out the other white wire. So, imagine a positive half-cycle of the mains, with the current actually coming in that first wire.
WORKING PRINCIPLE The first winding produces a north pole facing in; the second a South Pole facing in; etc, like this: N-S-N-S. Half a mains cycle later (10 ms) the current has reversed and so must the magnetic sense of the poles, which are now: S-N-S-N. The rotor is an electrical conductor, and therefore tries to follow this field. To do so it has to rotate through 90 degrees. The rotor thus takes two full cycles of the mains (40 ms) to make a complete rotation, and so revolves at 1500 rpm. At least, it would if it could keep up with the rotating field. But it can't, quite, and in fact it's only because it's slipping behind that any torque is developed at all. So, it rotates a bit slower than 1500 rpm (typically 1440 rpm) depending on how much torque it is being called upon to produce. Note that the motor, as described so far, could rotate happily clockwise or anticlockwise. This kind of motor therefore needs some kind of internal cleverness to ensure it only turns in the right direction. This is achieved, in this motor, by the use of shaded poles.
Advantages • Discharge is more • Space requirement is less while using two fans • Power consumption is low • Delivery time is reduced • It will available for low cost when it is mass produced • It will replace the space of two fans by doing the same work. • Deliver two opposite sides of air at once.
Disadvantages Motor life time slightly reduced. Motor efficiency is less
APPLICATION • Since it delivers air at two portions simultaneously, it requires a minimum space where two fans have to be used. By this simple work it can be installed in industries to deliver two opposite sides of air at once. • This single fan is used in a place where two fans are required • It is used for widely used in industrial and also used in home. • It is used for commercial purposes due to its portability • It is also used for personal purposes at home.
FUTURE SCOPE There is no oscillating system in our fan hence it provides air at some constant direction for implementing oscillating system it requires some other new attachments. The cost of this project is comparatively low when it will be mass produced. If the problems are rectified, this will have a good scope in future and become a completely successful one.
REFERENCE Sawada, Kazuo, "Magnetic Levitation (Maglev) Technologies 1.Supderconducting Maglev Developed by RTRI and JR Central", Japan Railway & Transport Review, No. 25, 58-61. He, J. L., Coffey, H. T., Rote, D.M. "Analysis of the Combined MagLev Levitation, Propulsion, and Guidance System", IEEE Transactions on Magnetics, Vol 31, No. # 2, March 1995, pp 981-987. Zhao, C. F., Zhai, W. M., "MagLev Vehicle/Guideway Vertical RandomResponse and Ride Quality", Vehicle System Dynamics, Vol 38, No # 3., 2002, pp 185-210. http://www.maglev.ir/eng/documents/papers/journals/IMT_JP_30.pdf http://cdn.intechopen.com/pdfs/34786/InTechStructural_and_kinematic_analysis_of_ems_maglev_trains.pdf
Conclusion Thus the pedestal fan is modified with two side blades successfully. We completed the project successfully by double suction and double delivery with 25% of increased discharge when compared to single side suction Pedestal Fan.