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  Construction of Table Fan

Introduction to Table Fan

A propeller blade fan comprising two or more blades is directly driven through an electric motor. It might be a bracket mounted wall kitchen fan, table fan, or a portable table fan. Four blades table fans are as well available to acquire more air delivery.

Parts of Table fan:

The main parts of the ceiling fan are displayed in the below diagram. The major components are the following;

248_Table Fan Homework Help.jpg

Diagram - Internal parts of table fan

1. Rubber Feet

11. Gear Box

2. Regulator Choke

12. Back Cover Fixing Screw

3. Capacitor

13. Bush Bearing

4. Blade Bush Fixing Screw

14. Link Fixing Screw

5. Spindle

15. Switch

6. Front Cover

16. Pivot Pin

7. Stator 

17. Crank Lever

8. Oscillator Knob

18. Wire Guard

9. Back Cover

19. Bottom Cover

10. Vertical Spindle

 

Enclosure:

The place in which the fan motor is mounted might be totally enclosed type or ventilated type. The enclosure material is usually cast iron.

Body and stand:

The body of the table fan is generally made up of die cast iron or aluminum alloy. The body is fitted or mounted to the heavy base stand, made up of die cast iron or aluminum.

1484_Table Fan Homework Help 1.jpg

Diagram - External parts of table fan

Motor:

The table fan motor is mainly of a single phase capacitor start and run or seldom shaded pole type motor. The motor's operating voltage will be 230 V ± 10 % at a frequency of 50 Hz. This motor contains two parts that are stator and rotor. The stator, made up of laminated silicon steel, uses two windings termed as starting and running windings located 90 degree electrical apart. The windings are located in slots of laminated iron core. The starting torque relies on sine of angle among starting winding and running winding current. Thus Capacitor is employed generate needed phase shift between these current and therefore to generate high starting torque and will be connected in series with starting winding. Generally in table fan, an electrolytic capacitor of 1.5 mF. Rotor uses 1-phase squirrel cage winding.

Blades:

The blades, 3 or 4 in number, are made-up from Aluminum sheet foe light weight. Recent table fans comprise molded blades of plastic material.  The blades are completely balanced to make sure proper and smooth air delivery. The sweep of the blade changes from 100 to 400 rpm (Revolutions per minute). The fan's speed is limited to less than 1000 rpm (Revolutions per minute). The blade assembly is built-in to the rotor shaft along with a grub screw.

Guard:

The guard is given for sufficient protection against personal injury. The front and rear of the fan guards are made out of wire mesh which covers the blade. It prevents the external objects coming in contact with the blade so avoiding an accident. The front guard is generally detachable and rear one will be lastingly fixed to the body of the fan. The diameter of the guard wire is generally not less than 1.6 mm and not additional than 10 mm.

Bearing:

Several fan motors make use of phosphor bronze sleeve bearings mounted in the bell housings and make use of felt wick to supply oil to a small hole drilled by the bearing wall. In the bell housing the felt wick receives oil from a hole. Several fan motors employ an integral ball bearing to place the rotor. It is held in place through spring clips in the bell housing and is self-aligned.

Mounting:

Mounting means attaching the fan system (motor and blades) to its bottom. The mounting might be rigid (change of direction is through turning the complete fan body) or semi-rigid (the direction of draught can be changed without changing the direction of the base).

Oscillating mechanism:

The oscillating mechanism contains a worm gear or a motor shaft which engages a gear on a short jack along with the gear on the vertical shaft. A disc that attached to the lower end of the vertical shaft rotates at a extremely slow speed and by way of a strong crank lever attached to the disk at one end and the motor at the another end, the fan is caused to oscillate. This standard is used in several oscillating units built into the gear mechanism along with a compression stud device. This design allows the fan to be employed either as a stationary or an oscillating model.

Supply cord:

A 3 core, flexible sheathed conductor of length about 2 m is employed that has an earthing conductor together with other two conductors. A cord grip is as well inserted at the entry point of cord into the body.

Fan regulator:

Fan regulator is built in the table fan. There are several types of regulators

i) Resistance wire type

ii) Choke or inductor type

iii) Capacitor type and

iv) Electronic type.

Usually coiled resistance type regulator is employed in table fan.

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