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Diesel engines презентация
Содержание
- 1. Diesel engines
- 2. A slow speed or medium speed
- 3. s V-engine and in-line engine In
- 4. Trunk engine Crosshead engine PISTON
- 5. s 2-stroke crosshead engine
- 6. The cylinder is filled with air.
- 7. The atomizer (1) sprays the fuel
- 8. During the power stroke the
- 9. The piston makes a reciprocating motion. Piston The piston
- 10. 1 2 3 The crosshead
- 11. S 1 2 Crankshaft The crank (1)is connected to the crankshaft (2).
- 12. S The crank
- 13. S Gearwheels to drive the camshaft
- 14. S The campeak is fixed to the camshaft. campeak campeak The camshaft
- 15. s The push rod (1) may
- 16. S The exhaust valve (1)
- 17. S The exhaust valve is
- 18. S The scavenging air
- 19. S CROSS SCAVENGING LOOP SCAVENGING UNIFLOW SCAVENGING
- 20. S The cylinder liner (1) and
- 21. A coolant (fresh water) is injected
- 22. s Cooling the piston: The
- 23. SO The piston rings (1)
- 24. s 4-stroke cycle
- 25. S During the air induction stroke (or
- 26. S During the compression stroke the air
- 27. S During the power
- 28. S During the exhaust stroke
Слайд 2
A slow speed or medium speed Diesel engine
is a high
pressure propulsion plant
with internal combustion.
with internal combustion.
Слайд 3s
V-engine and in-line engine
In a V-engine the cylinders are placed
in an oblique (or bevel) position, unlike the in-line engine, where the cylinders are placed “in line”.
V-engine
In-line
engine
Слайд 6
The cylinder is filled with air.
S
During the compression stroke the air
in the cylinder is compressed.
cylinder
Слайд 7
The atomizer (1) sprays the fuel into the cylinder.
The nozzle divides the fuel into small particles.
1
atomizer
Tip of the atomizer
(nozzle).
The atomizer
Слайд 8 During the power stroke the fuel is injected and
burnt. This actuates the piston(1) and connecting rod (2).
1
2
The power stroke
Слайд 10
1
2
3
The crosshead (1) serves as a hinging connection between piston
rod (2) and connecting rod (3).
Crosshead guides and
crosshead guide shoes (4)
absorb the forces onto
the crosshead when the piston goes down.
Crosshead guides and
crosshead guide shoes (4)
absorb the forces onto
the crosshead when the piston goes down.
4
The crosshead
Слайд 12 S
The crank changes the
reciprocating motion of the
piston into a rotary motion
of the crankshaft .
of the crankshaft .
The crankshaft
Слайд 15s
The push rod (1)
may be used as a distance piece
between campeak
(2)
and rocker arm (3).
and rocker arm (3).
1
3
2
The pushrod
Слайд 16S
The exhaust valve (1)
is actuated (opened) by the
rocking lever
(2) (rocker arm).
2
1
The exhaust valve
Слайд 18S
The scavenging air manifold (1)
and scavenging ports (2)
supply the scavenging air
to
remove the exhaust gases.
1
2
The scavenging system
Слайд 20S
The cylinder liner (1)
and cylinder jacket (2)
form the cylinder wall.
1
2
Cooling the
cylinder:
Слайд 21
A coolant (fresh water)
is injected between
liner and jacket
to cool the cylinder.
s
Cooling
the cylinder:
Слайд 22s
Cooling the piston:
The advantages of oil as
a coolant are:
. it
reduces noise;
. it purifies;
. it forms a seal;
. it lubricates;
. it is anti-corrosive;
. it has a higher resistance
to heat.
. it purifies;
. it forms a seal;
. it lubricates;
. it is anti-corrosive;
. it has a higher resistance
to heat.
The piston is cooled by oil.
Слайд 23 SO
The piston rings (1)
form a seal around the cylinder
and carry away the heat.
1
Piston rings
Piston rings
Слайд 25S
During the air induction stroke
(or inlet stroke,
or suction stroke)
air is
drawn into the cylinder.
Suction stroke
Слайд 28S
During the exhaust stroke
the exhaust gases are
driven out of the cylinder
by
the piston.
the piston.
Exhaust stroke
