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Rotary screw air compressor
 in rotary screw air compressors, the most
important part is the screw unit. For this reason
they are called as rotary screw.
 When compressor start running, firstly, it raises
the compressor’s inside pressure approximately
1-2 bar.
Rotary screw air compressor
 It consist of two screws - one with convex
and the other with concave contour
mostly called male and female rotor
respectively.
 These two screws gets rotating by means
of gear trips there by sucking the air
through an inlet port in chamber and then
compressing the same.
 Thus compression begins and air is
discharged at the end of other side.
 There is no contact between male and
female rotors and casing. Hence no
lubrication require but oil may injected
for the purpose of cooling.
Rotary screw air compressor
 The helix of the male and female rotor screw
is designed to permit complete charging of the
inter lobe space before the re-mesh.
 On completion of the filling operation the inlet
end of male and female lobes begins to re-
engage thus reduces the volume of air
continuously.
Rotary screw air compressor
 There are many different types of rotary
screw air compressors based on :-
1. Stages
2. cooling method
3. drive type.
 COOLING METHODS :-
1. Oil-free compressors
2. Oil-Injected Compressors
 Advantages :-
 Screw air compressors are designed as quiet by
the manufacturers.
 More efficient than reciprocating compressors.
 Screw air compressors can reach high capacities
that piston compressors cannot.
 These compressors are the high technology
products.
 If services done completely, they are long lived.
 Disadvantages :-
 Screw air compressors are more expensive than
reciprocating air compressors.
 Did you know?
 Rotary screw technology is the same technology
utilized by superchargers in high-performance
engines !
Rotary screw air compressor

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Rotary screw air compressor

  • 2.  in rotary screw air compressors, the most important part is the screw unit. For this reason they are called as rotary screw.  When compressor start running, firstly, it raises the compressor’s inside pressure approximately 1-2 bar.
  • 4.  It consist of two screws - one with convex and the other with concave contour mostly called male and female rotor respectively.  These two screws gets rotating by means of gear trips there by sucking the air through an inlet port in chamber and then compressing the same.
  • 5.  Thus compression begins and air is discharged at the end of other side.  There is no contact between male and female rotors and casing. Hence no lubrication require but oil may injected for the purpose of cooling.
  • 7.  The helix of the male and female rotor screw is designed to permit complete charging of the inter lobe space before the re-mesh.  On completion of the filling operation the inlet end of male and female lobes begins to re- engage thus reduces the volume of air continuously.
  • 9.  There are many different types of rotary screw air compressors based on :- 1. Stages 2. cooling method 3. drive type.  COOLING METHODS :- 1. Oil-free compressors 2. Oil-Injected Compressors
  • 10.  Advantages :-  Screw air compressors are designed as quiet by the manufacturers.  More efficient than reciprocating compressors.  Screw air compressors can reach high capacities that piston compressors cannot.  These compressors are the high technology products.  If services done completely, they are long lived.
  • 11.  Disadvantages :-  Screw air compressors are more expensive than reciprocating air compressors.
  • 12.  Did you know?  Rotary screw technology is the same technology utilized by superchargers in high-performance engines !