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  Constructional Parts of Hair Dryer

Introduction to Constructional parts of Hair Dryer

A hair dryer requires only two parts to produce the blast of hot air that dries the hair:

a. A simple motor-driven fan

b. A heating element

But additionally to above parts, most basic models will comprise two switches, one to turn them on and off and one to control the rate of airflow. A number of models comprise an extra switch, termed as thermostat switch that employed to regulate the temperature of the airflow.

Motor driven fan:

The fan should possibly be known as a blower; the blade is shaped such as the impeller on a vacuum cleaner and mounted in a housing that is connected to the outlet duct. Several motors are of single speed, shaded pole motors specifically in the smaller models. A number of the larger and much more elaborate types have multiple speed motors or solid state control units on Universal motor. Early on hair dryers put out just about 100 W (watts) of heat. But these days hair dryers generating up to about 2,000 W (watts) are presented, drying hair significantly faster. The motors will be intended to work on 230 V, 1-phase, 50 Hz AC supply. The small black fan sits atop the motor as displayed in the below diagram. The motor spins the fan. Air is drawn in by the openings on the side of the hair dryer.

Heating element:

The heating element in most of the hair dryers is a bare, coiled nichrome wire that is wrapped around insulating mica boards as displayed in the diagram (Heating element).

Nichrome wire is an alloy of two metals, chromium and nickel. This alloy is employed in heating elements in a several number of household products, to toasters from curling irons. Nichrome wire comprises two characteristics which make it a good producer of heat:

1. It is a poor conductor of electricity as compared to something such as copper wire. This provides the alloy sufficient resistance to get hot from all of the current flowing into it.

2. It does not oxidize when heated. Other metals such as iron rust pretty quickly at the temperatures employed in toasters and hair dryers.

The open wire type's heating element is, wound on thin mica insulating board. Something seen more frequently recently is hair dryers along with a ceramic coating on the heating element. Coming in a range of dissimilar configurations, ceramic-coated heating elements are said to heat more consistently and efficiently. It is also well-liked to infuse the ceramic with materials like crushed tourmaline that is said to support the creation of ions and ideal heat flow. The common of hair dryers seem to use a three-section heating element (low, medium and high heating element) that controlled through a selector switch.

Thermostat Switch:

Every heating element has unique thermostat switch that mounted near the air nozzle that senses the temperature of the air flow. The thermostat switch is generally closed and is open if the hot air blow outside the heated circuit becomes very hot. A fuse might be found connected in series among the temperature control switch and the heater element.

Selector switch:

When the majority of hair dryers seem to make use of a three-section heating element (low, medium and high heating element) that controlled through a selector switch, the switch will comprise three positions - low, medium and high to choose the heating element according to the need.  The selector switch will all the time be connected to the motor and after that to the heater circuit that is why the heating element cannot be turned on unless the motor is running.

The figure showing electrical connection of motor, selector switch and heating element are displayed in the below diagram:

2045_hair Dryer Homework Help 4.jpg

Diagram - Electrical wiring diagram of Hair dryer

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