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HYDRAULIC SCREW COMPRESSORS
OPERATING PRINCIPLES
The nominal discharge is achieved when the compressor is rotated by hydraulic
flow adequate to the nominal rotation speed.
HYDRAULIC FLOW (l/min)
0
DISCHARGE (l/min)
Q
pi
_nom
Q
pi
_
min
Q
hy
_min
Q
hy
_nom
Picture 7: The nominal discharge of hydraulic screw compressor
3.2. LUBRICATION SYSTEM OF COMPRESSOR
Compressor oil has following functions:
1. LUBRICATION
: Pressure differential makes the oil spread along grooves to the
surfaces to be lubricated. Separate oil pump is not needed.
2. HERMETIZATION
: Injected oil seals screw surfaces against each other.
3. COOLING:
DYNASET HKR screw compressor is equipped with oil heat exchager.
The compressor’s heat is transferred to hydraulic system with heat exchanger.
HKR screw compressor requires cooling capacity from base machines hydraulic
system.
3.3. PRESSURE AND COMPRESSION RATIO
The rated absolute intake pressure is 1 bar (1000 hPa).
NOTE!
The reference barometric pressure at sea level is 1,0135 bar, when at 1000
m above sea level it drops to 0,9 bar.
When the operational pressure of HKR-compressor is 10 bar, compression ratio is
equal to:
The compression ratio for unit of (x) bar is calculated in the same way.
Summary of Contents for HKR 1300
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