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Optimizing Air-Flow In Rotor

  • The air-flow patterns resulting from the most widely used methods for producing a vaccum  in the rotor { i.E. , Self -pumping rotors & external suction } show differences in their usefulness  for rotor self cleaning.
  • The external suctions gave the better cleaning effect.
  • With self pumping system ,the under pressure is dependent on the spinning speed of the rotor , whereas with the external suction system the under pressure is independent of the rotor speed & can be kept at its optimum level irrespective of variations in rotor speed .
  •  The external -suctions system ,nevertheless, has a significant limitation in that the discharge of the air usually takes place over the rim of the rotor , i.E. , Through the gap between the rotor cover & the rotor rim.
  • The air at this position is subjected to a strong friction drag & a rapid constriction of its flow path.
  • As a result, dust & trash particles being carried in the air flow as it is exhausted become deposited on the rotor rim & eventually end up within groove .
  • The figure illustrates one design.
  • The exhaust for the air-flow [5] is machined in the casing[2] , which fits into the rotor inlet.
  • Being shielded by the flanged doffing tube [6]  , the yarn tail can not be disturbed .
  • However, the external suction, when connected to the exhaust channel , will cause the air entering the rotor from both the hole [4]  in the doffing tube[ 30] & the transport tube to carry the entrained dust & trash particles away from the rotor wall [13] .
  • Because the constriction of the air-flow is more gradual, particle deposition  is less likely to occur.


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