Comp 3
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Compressed air generators
3.
Compressed air generators
Compressors (compactors) are engines used for pumping and compressing gases to any pressure.
Ventilators are flow machines that pump nearly atmospheric air. With ventilators only slight changes to density and temperature occur.
Vacuum pumps are machines that induct gases and steam in order to create a vacuum.
3.1
Compressors ( compactors )
3.1.1
Dynamic compressors ( Turbo-compressors )
Dynamic compressors are for instance turbo-compressors, by which running wheels equipped with blades accelerate the gas to be compressed. Fixed direction gear on the blades converts speed energy into pressure energy.
Dynamic compressors are to be preferred for large quantities of medium and low medium pressures.
3.1.2
Displacement compressors
On displacement compressors the compression chamber closes completely after taking in the air. The volume is reduced and the air compressed by force.
Displacement compressors are to be preferred for small quantities of medium and high medium pressures.
24
Compressed air generators
3.2
Types of compressor
The summary shows the compressors divided according to their operating principle. With all compressors, a distinction is drawn between non-oillubricated and oil-lubricated compressors.
Compressors ( compactors )
displacement compressors
Turbo-compressors
Axial compressor
Radial compressor
oscillatory
with crank drive
rotary
without crank drive
single-shaft
multipleshaft
Rotary vane compressor
Screw compressor
Liquid ring compressor
Rootscompressor
piston compressor
Plunger compressor
Crosshead compressor
Diaphragm compressor
Free-piston compressor
25
Compressed air generators
3.2.1
Standard compressors
Type
Symbol
The table shows the typical areas of work for various standard types of compressor.
Op. diagram
Pressure range
Volume flow
[ bar ]
[ m3 / h ]
Plunger compressor
10 ( 1-stage ) 35 ( 2-stage )
120 600
Crosshead compressor
10 ( 1-stage ) 35 ( 2-stage )
120 600
Diaphragm compressor
low
low
Free piston compressor
26
limited use as gas generator
Rotary vane compressor
16
4 500
Liquid ring compressor
10
Screw compressor
22
750
Root compressor
1,6
1 200
Axialcompressor
10
200 000
Radialcompressor
10
200 000
3.
Compressed air generators
Compressors (compactors) are engines used for pumping and compressing gases to any pressure.
Ventilators are flow machines that pump nearly atmospheric air. With ventilators only slight changes to density and temperature occur.
Vacuum pumps are machines that induct gases and steam in order to create a vacuum.
3.1
Compressors ( compactors )
3.1.1
Dynamic compressors ( Turbo-compressors )
Dynamic compressors are for instance turbo-compressors, by which running wheels equipped with blades accelerate the gas to be compressed. Fixed direction gear on the blades converts speed energy into pressure energy.
Dynamic compressors are to be preferred for large quantities of medium and low medium pressures.
3.1.2
Displacement compressors
On displacement compressors the compression chamber closes completely after taking in the air. The volume is reduced and the air compressed by force.
Displacement compressors are to be preferred for small quantities of medium and high medium pressures.
24
Compressed air generators
3.2
Types of compressor
The summary shows the compressors divided according to their operating principle. With all compressors, a distinction is drawn between non-oillubricated and oil-lubricated compressors.
Compressors ( compactors )
displacement compressors
Turbo-compressors
Axial compressor
Radial compressor
oscillatory
with crank drive
rotary
without crank drive
single-shaft
multipleshaft
Rotary vane compressor
Screw compressor
Liquid ring compressor
Rootscompressor
piston compressor
Plunger compressor
Crosshead compressor
Diaphragm compressor
Free-piston compressor
25
Compressed air generators
3.2.1
Standard compressors
Type
Symbol
The table shows the typical areas of work for various standard types of compressor.
Op. diagram
Pressure range
Volume flow
[ bar ]
[ m3 / h ]
Plunger compressor
10 ( 1-stage ) 35 ( 2-stage )
120 600
Crosshead compressor
10 ( 1-stage ) 35 ( 2-stage )
120 600
Diaphragm compressor
low
low
Free piston compressor
26
limited use as gas generator
Rotary vane compressor
16
4 500
Liquid ring compressor
10
Screw compressor
22
750
Root compressor
1,6
1 200
Axialcompressor
10
200 000
Radialcompressor
10
200 000
