Doosan 7/20 User manual
10/12/2010
1
Small compressors
COMPRESSOR TRAINING
Company Confidential
SMALL COMPRESSORS RANGE
•7/20 - P65 - 7 bar (100 PSI), 1.9 m3/min (70 cfm)
•7/26E - P90 - 7 bar (100 PSI),2.5 m3/min (90 cfm)
•7/31E - P110 - 7 bar (100 PSI), 3.0 m3/min (105 cfm)
•7/41 - P135 -7 bar (100 PSI), 4.0 m3/min (140 cfm)
•7/51 - XP185 -7 bar (100 PSI), 5.0 m3/min (175 cfm)
•7/71 - P260 -7 bar (100 PSI), 7.1 m3/min (250 cfm)
•12/56 -12 bar (170 PSI), 5.6 m3/min (200 cfm)
Company Confidential
SUMMARY
•The compressor can be divided in the following subsystems
–ENGINE & AIREND
–LUBRICATION & COOLING SYSTEM
–AIR FLOW REGULATION SYSTEM
–SEPARATION SYSTEM
–BLOWDOWN SYSTEM
–INSTRUMENT/CONTROL PANEL
–ELECTRICAL WIRING
•Troubleshooting
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Company Confidential
ENGINE (7/20)
Compressor 7/20
IR Designation 3IRJ5N
Model D 1005
Cylinders 3
Displacement 1 L
Rated Output (kW@RPM) 17.5@3000
Aspiration Naturally aspirated
Fuel Pump Mechanical inline
pump
Emissions Tier II certified
Electrics 12 Volts
Company Confidential
ENGINE Tier 2 (7/26E –7/51)
Compressor 7/26E 7/31E 7/41 7/51
IR
Designation 3IRH2NS 3IRH8N 4IRH8N 4IRI8N
Model 3TNV82A 3TNV88 4TNV88 4TNV98
Cylinders 3344
Displacement 1,3 1,6 2,2 3,3
Rated Output
(kW@RPM) 21,1@2800 25,8@2800 34,8@280
049,7@240
0
Aspiration Naturally aspirated
Fuel Pump Mono plunger mechanical pump
Emissions Tier II certified
Electrics 12 Volts
Company Confidential
ENGINE Tier 3(7/51) from September 2008
Compressor 7/51
IR Designation 4IRI8NE-2
Model 4TNV98
Cylinders 4
Displacement 3,3
Rated Output (kW@RPM) 50.2@2400
Aspiration Naturally aspirated
Fuel Pump Mono plunger
mechanical pump
Emissions Tier III certified
Electrics 12 Volts
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Company Confidential
ENGINE Tier 2 (7/71 –12/56)
Compressor 7/71 –12/56
IR Designation 4IRD5N
Model JD 4045DF270
Cylinders 4
Displacement 4.5 liter
Rated Output (kW@RPM) 60@2500
Aspiration NaturallyAspirated
Fuel Pump Rotary fuel pump
Emissions Tier II certified
Electrics 12 Volts
Company Confidential
ENGINE Tier 3 (7/71 –12/56) from October 2008
Compressor 7/71
IR Designation 4IRI8TE
Model 4TNV98T
Cylinders 4
Displacement 3,3
Rated Output (kW@RPM) 59.2@2300
Aspiration Turbocharged
Fuel Pump Mono plunger
mechanical pump
Emissions Tier III certified
Electrics 12 Volts
Company Confidential
Eco-Governor is Yanmar unique electronics control governor
system which has been used for over 10 years mainly for
agricultural machine. Yanmar has renewed this system to
apply all equipment and named “2G Eco-Governor” which
means second generation Eco-Governor. In addition, EGR
valve for NV3 engine is controlled by this system.
MP type fuel Injection Pump
with ECO Governor
ECU
ECO-Governor system
EGR Valve
EGR Control system
ENGINE Tier 3 Improvements –YANMAR ECO
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Company Confidential
Speed
Rack
position
Eco-Governor
Fuel Pump CSD
Actuator
EGR
Starting Aid
CW Temp.
Starter
Display
Switch
Key Switch
OFF ON
START
Accelerator
CAN
ENGINE Tier 3 Improvements –YANMAR ECO
Company Confidential
EGR Control –exhaust gas re-circulation
Standard Function for >= 37kW
Intake Exhaust
ECU Speed,Load & Temp
ECU
EGR Valve
Piston
Inj.Nozzle
EGR Valve
Combustion temperature is reduced.
NOx Reduced
Exhaust Gas Re-Circulation
Speed, Load, &
Temp.
ENGINE Tier 3 Improvements –YANMAR ECO
Company Confidential
Intake
EGR-Valve
Piston
Liner
Inj.Nozzle
Exhaust
Turbo Charger
EGR Cooler
Reverse flow protection
Re-circulated Gas Cooling for
Low Emission
Cooled EGR system ECU Speed , Load & Temp.
ECU Speed , Load & Temp.
Re-circulation
One way valve
One way valve
ENGINE Tier 3 Improvements –YANMAR ECO
10/12/2010
5
Company Confidential
Fuel filter
Electric fuel
feed pump
Fuel tank
Engine crankcase
Accumulator
Overflow
orifice
Timer piston
Plunger
Distributor
shaft
Torochoid pump
Fuel return
Pressure control valve
Fuel injection pipe
Nozzle
Injection pump
tappet
Oil seal
joint
Engine oil
Cam
High pressure gallery
Low pressure gallery
orifice
Water separator
12/48
Engine coolant
Thermo-element
Engine oil
Cam
Trochoid pump
ENGINE Tier 3 Improvements –YANMAR ECO
Company Confidential
ENGINE Tier 3 Improvements –YANMAR ECO
Company Confidential
AIREND
•Casing houses two screw-type rotors mounted on ball and roller
bearings.
•Diesel engine drives the male rotor through heavy-duty coupling.
•Mechanical seal used to seal the shaft.
•Gear sets allow to change rotor speed and therefore air output.
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Company Confidential
CE55RW - AIREND
AIREND (7/20)
•Now used on 7/20 only, formerly used on 7/21 and 7/26.
•Cast iron body.
Company Confidential
AIREND (7/20)
•Now used on 7/20 only.
•Formerly used on 7/21 and 7/26.
Company Confidential
AIREND (7/26E - 7/51)
•85 mm Airend.
•Different gear sets permit to adjust air delivery.
•Cast aluminium body.
•Repair not advised.
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Company Confidential
AIREND CF 90 (7/71 - 12/56)
•Different gear sets permit
the use of this airend as 7/71
or 12/56.
Company Confidential
COMPRESSOR OIL SYSTEM
•Functions of the oil system:
–Lubricating the rotors, airend bearings and mechanical seals
–Sealing the clearances between the airend rotors
–Cooling of the airend. Heat is generated during air compression.
•The oil flows due to the air pressure. No oil pump is required.
Company Confidential
LUBRICATION & COOLING (7/20)
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8
Company Confidential
LUBRICATION & COOLING
•The Separator tank is also the
reservoir of compressor oil.
•Pressure in the tank is forcing
the oil through the system.
Company Confidential
LUBRICATION & COOLING
•Cool box design with pusher
type fan.
Company Confidential
LUBRICATION & COOLING
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Company Confidential
LUBRICATION & COOLING (7/71 –12/56)
Company Confidential
LUBRICATION & COOLING (7/71 –12/56)
Company Confidential
LUBRICATION & COOLING (7/71 –12/56)
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