Energy-efficient
on All Roads.
Air Compressors
3
Energy-Efficient on the Roads.
Air Compressors from Voith
At the historic vehicle location Zschopau, Saxony, Voith develops
and produces a new generation of air compressors for trucks,
buses and off-road vehicles.
These air compressors excel by their
significantly higher energy efficiency,
low-emission operation, reduced weight
and extended service intervals.
LP 490 for MAN D 08
2
Apart from employing a team of experienced engineers, Voith also utilizes the
know-how of the nearby universities,
among them TU Dresden, for implementing i­nnovative solutions in the field
of reciprocating compressor design.
LP 490 for Daimler OM 457
Product Overview
The portfolio covers pre-charged twoand three-cylinder air compressors made
from gray-cast iron or cast aluminium.
Key benefits:
Higher energy efficiency
–Reduced fuel consumption by
up to 1.0 l / 100 km
–Energy recuperation in braking
and coasting operation possible
• Significantly extended duty cycles:
up to 85 %
• Improved air quality
–Extended maintenance intervals
–Low-emission operation
–No harmful products leading
to oil cracking
• Higher pressure levels possible for
operation in excess of 15 bar
•
LP 490 for Daimler OM 93x / 47x
Dimensions
Type
Lenght
Height
(without nozzle)
Width
LP 490
for MAN D 08
292 mm
326 mm
151 mm
233 mm
370 mm
incl. flange
173 mm
incl. flange
LP 490
for Daimler OM 93x / 47x
263 mm
354 mm
155 mm
LP 700
for Daimler OM 457
407 mm
351 mm
175 mm
LP 725
for Daimler OM 47x
350 mm
440 mm
178 mm
LP 490
for Daimler OM 457
LP 700 for Daimler OM 457
LP 725 for Daimler OM 47x
3
The CapaCity from Mercedes-Benz
Passed the Test:
The LP 700 in the Mercedes-Benz CapaCity
Since 2008, the 3-cylinder LP 700 air
compressor is used in the four-axle
low-floor CapaCity articulated bus with
a length of nearly 20 meters. 250 buses
of this type with 193 seats are in service in the “Metrobüs” BRT (Bus Rapid
Transit) system in Istanbul where they
have to cope with tough operating conditions. The buses run at intervals of
up to 30 seconds and achieve average
speeds – including scheduled stops –
of approximately 40 km / h. They move
about 750 000 passengers every day
with average annual mileages of
160 000 km.
The CapaCity is fitted exclusively with
the LP 700 from Voith – the only air
compressor in the market that meets
the demands of this megabus in terms
of air requirements.
In practical operation, the LP 700 stands
out by high reliability and ­robustness.
Examinations after ­
mileages of more
than 250 000 did not come up with any
negative results.
4
The Operating Principle
The pre-charging process of the system
with its unique intercooling system results in a significantly reduced power
uptake during d
­ elivery operation. At the
same time, the compression temperature drops, which allows longer duty
cycles and therefore increases the air
delivery per hour, while the stroke volume
remains the same.
Automatic idle system (SLS)
in delivery operation
Balancing piston
FPressure
Suction chamber
Pressure chamber
Intermediate chamber with cooler
FSpring
SV
DV
Suction pressure
SV
DV
Intermediate pressure
Piston Stage 1
End pressure
Piston Stage 2
Outside delivery operation, the newly
developed idle system SLS significantly
reduces fuel consumption.
As a result of reduced temperatures,
the engine oil is subjected to less stress.
Oil cracking and the formation of harmful substances are therefore prevented.
Comparison
one-stage series air compressor and two-stage Voith air compressor
One-stage series AC
Two-stage Voith AC
100 %
Specific
displacement
Specific
energy consumption
Final compression
temperature
Possible
systems pressure
Operational savings and therefore reduced power intake
by two-stage turbo-compression with intermediate cooling
pD
Pressure
One-stage
Two-stage, stage 1
Two-stage, stage 2
Operational saving
pZ
pS
Volume
5
G 2096 e ak / WA 1 500 2012-08 Dimensions and illustrations without obligation. Subject to modifications.
Voith Turbo Verdichtersysteme
GmbH & Co. KG
Am Helmgarten 4
09405 Zschopau, Germany
Tel. + 49 3725 344 86 -0
Fax + 49 3725 344 86 -101
[email protected]
voith.com