Annelies rollez Presentation

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Annelies rollez Presentation

  1. 1. How the hair dryer works<br />For dummies<br />Ionic 1800W BaByliss<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  2. 2. 1. History<br />1890: Alexandre F. Godefroy invented the hot air hairdyer<br />1925: - First hairdryer appaered on the market. <br /> -100 watts of heat the hair doesn’t dry quickly<br /> - The hairdryers were made of steel and zinc heavy <br />1925 -1945: - optimize the design <br /> - 300 watts of heat<br />1960: - Improvements in hairdryers’ technology: 500 watts of heat<br />1970: - Improving the safety of the hairdryers<br /> - the Consumer Products Safety Commission (CPSC) recommend <br /> guidelines that would create safer products.<br />1990: - Portable hairdryers: 1500 watts of heat<br /> - Plastic technology and insulating materials light weight<br />2000- ...: - can reach 2000 watts of heat<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  3. 3. 2. Disassembly<br />Heating-element with wrapped filaments <br />Elements to have no filth into the fan<br />Air shaft<br />Fan and motor<br />The housing<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  4. 4. Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  5. 5. 3. Working hair dryer<br />Hair dryer 2 superior parts : 1. Heating-element<br /> 2. Fan driven by a little motor<br />When you put the plug into the plug-socket the electric current flow <br />through the hair dryer<br />2. Wrapped filaments of the heating element provided with that current <br /> warm up<br />3. Current also will also drive the motor, which will next drive the fan<br />4. The fan sucks air into the hair dryer air passes the filaments air takes <br /> up the warmth<br />5. Heated air leaves the hair dryer and dries the hair because it accelerate <br /> the evaporation of the water on the hair. Heat air raises the temperature of <br /> the air around the hair.<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  6. 6. Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  7. 7. Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  8. 8. Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  9. 9. 4. How each part works<br />4.1. The motor<br />4.1.1. Direct current motor<br />Electromagnetism and magnets important <br />For the motors’ working process<br />The principle of the working of the motor:<br /><ul><li> Contradictory poles attract each other
  10. 10. Identical poles reject each other</li></ul> a rotating movement <br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  11. 11. Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  12. 12. Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  13. 13. 4.1.2. DC motor vs AC motor<br /><ul><li>DC motors may be better for some very small applications </li></ul> costs less<br /><ul><li> Smaller
  14. 14. Lighter
  15. 15. AC motors are rugged and reliable
  16. 16. AC motors can operate at higher speeds
  17. 17. AC motors are available in larger power ratings
  18. 18. For larger applications</li></ul>Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  19. 19. 4.1.3. AC-DC converter<br /><ul><li>By means of diodes </li></ul> A diode conducts the current just in one direction<br /><ul><li>In this hair dryer: AC-DC converter = bridge rectifier</li></ul> consist of 4 diodes<br />Current always flows in only<br /> one direction through the <br />resistor.<br />Alternating current<br />Direct current<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  20. 20. 4.2. The switches<br />To control the heat<br />To control the air speed<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  21. 21. 4.3. The heating element<br />Nichrome wire aroundisolating elements of mica<br />The air that goes through the fan and <br />passes the elements of the heating <br />Element much colder than the <br />Temperature of the nichrome wires.<br />Because of that, the air will absorb <br />the warmth of the heating element.<br />the heat is dependent <br />from the wattage of the hair dryer.<br />Wattage electric current through <br />the nichrome wire resistor <br />Temperature <br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  22. 22. 4.4. The fan<br />The air flow will be generated by the fan<br />The electric motor: electric energy<br />An air flow<br />Through the vent holes<br /> Protected with an gauze, which protects the hair dryer against dust<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  23. 23. 4.5. Safety features<br />4.5.1. Safety sensor<br />- When the fan is broken, the hair dryer can be overheated. To Protect the hair dryer against it, the hair dryer will be supplied with a safety sensor.<br />So when the temperature gets to high, the hair dryer will stop working.<br />When the hair dryer is totally cooling down, then they can use it again.<br /><ul><li> When the vents become clogged with hair of dust, the hair dryer becomes earlier overheated and so will stop working.</li></ul>Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  24. 24. 4.5.2. Safety cut off switch<br />Dryers contain a safety cut off switch that prevents the temperature of the drier from exceeding 60°C. <br />Switch is a bimetallic strip made of a sheet composed of 2 different metals. Both sheets expand when heated, but each at different rates<br />When the temperature inside the hair dryer the sheets heat up and bends<br />When it reaches a certain point, it trips a switch that cuts off power to the hair dryer <br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  25. 25. 4.5.3. Thermal fuse<br />Thermal fuse included in the heating element<br />When the temperature or the current were excessively high thermal fuse <br />will blow and break <br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  26. 26. 4.5.4. Ground Fault Circuit interrupter (GFCI)<br />Is used to prevent accidental electrocution<br />by comparing the electrical going out through the black wire against that coming back through the white wire. If the difference is more than .005 amp, the system will be shut off.<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  27. 27. 4.5.5. Insulation<br />This is a sheet that’s around the heating element and that prevents the exterior of the hair dryer from getting hot.<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  28. 28. 5. Choice of materials<br />5.1. The heating element<br />The heating element <br />= <br />atensionspring of nichrome.<br />It has a good development of heat because of two characteristics:<br />It doesn’t conduct very well <br /> resistor is big enough to create warmth of the current<br />2. It doesn’t oxidize<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  29. 29. 5.2. The housing<br /><ul><li>Polypropylene</li></ul> Advantages of this material:<br /> 1. Lightest<br /> 2. Strong<br /> 3. Equal to bacteria<br /> 4. Eco Friendly<br />- All parts were made by ‘Injection Moulding’.<br />4 stages:<br />1. Melting<br /> 2. Injecting<br /> 3. Cooling<br /> 4. Removing<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  30. 30. 6. The connections<br />the 2 parts of the housing 3 screws<br />The housing of the switches 3 screws<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
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  32. 32. Click-connection<br />Technological Design Engineering Annelies Rollez Academiejaar 2010-2011<br />
  33. 33. 5. Calculations<br />5.1. Motor<br />

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