Getting the Speed Right. Voith Variable Speed Fluid Couplings

Getting the Speed Right.
Voith Variable Speed Fluid
Couplings
1
Voith sets the standards in the energy, oil & gas, paper, raw
materials and transportation & automotive markets.
Founded in 1867, Voith employs more than 43 000 people,
generates Euro 5.7 billion in sales, operates in over 50
countries around the world and is today one of the largest
family-owned companies in Europe.
2
If Reliable Speed Control is
what You’re Looking for …
Voith variable speed fluid couplings operate on the principle of hydrodynamic
power transmission. Many of our couplings have been in use providing troublefree service for more than 40 years.
Voith variable speed fluid couplings can reach power transmission levels
ranging from 100 kW up to 10 000 kW. In drivelines with electric motors or
internal combustion engines, they control the speed of the driven machine,
ensuring that it consistently runs at the speed best suited to your purpose.
Voith variable speed fluid couplings are particularly well-suited
for use in pumps, fans, and compressors and have been the
products of choice in these areas for decades.
Typical applications
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•
•
•
•
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Power plants
Oil and gas industry
Chemical industry
District heating plants
Iron and steel industry
Water management
3
Increase Your
System Availability.
System availability is particularly important in power plants, refineries, oil
platforms, or other industrial uses. Unscheduled downtime can result in
considerable loss of revenue and excess costs. That’s not something our
customers have to worry about.
Increase your reliability
Voith has been building variable speed fluid couplings since
1952. Whether it's in the desert, a tropical rainforest, maritime
conditions, or potentially explosive environments, Voith variable speed fluid couplings operate with peerless reliability.
They are impervious to external influences thanks to their
compact and robust design.
Extend your unit’s service life
Load-free motor start-up and smooth acceleration of the
driven machine reduce the overall load on the driveline. The
hydrodynamic variable speed fluid coupling also dampens
torsional vibrations and shocks, protecting the motor and the
driven machine. This increases the service life of your entire
driveline.
Reduce energy consumption
The drive motor power consumption at low speeds is less
than for fixed-speed units with throttle control. That saves
energy and reduces operating costs.
Save space — with an integrated lube oil system
The lube oil system on Voith variable speed couplings can
supply oil to the motor and driven machine at any time. You
save space and money.
Reduce your costs
Wear-free hydrodynamic power transmission keeps maintenance costs low by allowing long intervals between scheduled
maintenance tasks. Unlike systems with power electronics, no
additional investments are needed during the total operating
hours.
4
15 000 Currently in use in more than
drives around the world.
4x 58
years
Service life up to
More than
longer than a variable frequency drive.
of use.
Power ratings up to
10 000 kW
Operating temperatures from
-40°C to +50°C
(ambient temperature)
5
Compact, Simple, Robust.
How it works
Voith variable speed couplings are fluid couplings. They link
the drive machine — generally an electric motor — with the
corresponding driven machine. The power is transferred
through the fluid energy of the working fluid. This fluid flows in
an enclosed working chamber between the pump wheel
(linked to the input shaft) and the turbine wheel (linked to the
output shaft).
The coupling fill level can be adjusted between 0 % and 100 %
during operation, enabling precise and continuously variable
driven machine speed control. The control range depends on
the load characteristic (torque to speed ratio).
Variable speed fluid coupling – 3D sectional diagram and simplified longitudinal section
1 2
3
7
6
8
6
1 Pump wheel
5 Scoop tube
2 Turbine wheel
6 Cooler
3 Shell
7 Oil pump
4 Scoop tube housing
8 Oil tank
4 5
Torque curves
Operating range
The performance diagram shows the transmittable coupling
torques MK for various scoop tube positions versus the output
speed. The desired output speed is the result of a stable
intersection point of the coupling torque MK and the load
torque (load characteristic).
Torque curves for different driven machines in the variable speed fluid coupling characteristic diagram
40 %
125
50 %
60 %
70 %
80 % 90 %
100 %
III
Smin
1
100
I
75
MK in %
30 %
II
2
3
4
50
20 %
25
10 %
IV
0 %
0
0
50
100
Output speed in % of input speed
Operating ranges
The exact characteristic curve is dependent on
the size of the coupling, the amount circulating,
and the oil viscosity.
I , IV Starting range
Parameters
Scoop tube position in % of scoop tube stroke.
M K
Coupling torque
SminNominal slip at design point
II Control range
S = (1 - n2/n1 ) · 100 [%]
III Overload range
n1 Input speed
n2 Output speed
Typical load characteristics
1 Constant torque
(e.g., volumetric pumps with constant
backpressure and compressors)
2 Decreasing torque
(e.g., boiler feed pumps with floating
pressure operation)
3 Parabolic torque
(resistance parabola, pumps with no
backpressure, fans)
4 Decreasing torque
(e.g., boiler feed pumps operating with
fixed pressures)
7
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The Product Family –
Find the Best Solution.
Our product range comprises a wide range of choices.
This allows us to meet your needs, whatever they may be.
We work together with you to choose the variable speed
fluid coupling that best matches your drive and system.
Type
Features
SVTL
The SVTL features a tunnel housing and
shafts with antifriction bearings.
SVNL
SVNL G
The SVNL features a housing split horizontally. Shafts in the SVNL have antifriction
bearings; SVNL G is equipped with sleeve
bearings.
SVL M
The SVL M features an especially high power density and has a cast iron housing split
horizontally. The shafts are equipped with
sleeve bearings.
SVNL vert.
The SVNL vert. is a self-supported design
featuring a vertical orientation.
9
SVTL Models
The SVTL coupling is a self-supported design featuring a tunnel housing. The rotating parts are encased in an enclosed
oil-proof housing. Connecting couplings link the electric motor
and driven machine with the variable speed fluid coupling. The
oil tank is built into the housing and the oil pump is driven by
the input shaft. The shafts are equipped with antifriction bearings lubricated by a mechanically driven lubricating oil pump
in the variable speed fluid coupling.
SVTL model variable speed fluid coupling and simplified longitudinal section
1 2
3
7
6
8
10
1 Pump wheel
5 Scoop tube
2 Turbine wheel
6 Cooler
3 Shell
7 Oil pump
4 Scoop tube housing
8 Oil tank
4 5
SVTL selection diagram
SVTL dimensions
TL
33
HP
8 000
7 000
2
56
12
SV
48
TL
SV
.2
2
22
TL
C
Oil capacity
[mm]
[l]
Weight
[kg]
422 SVTL 22-2,0
1 120
630
1 780
250
487 SVTL 22.2
1 145
630
1 780
250
900
487 SVTL 12.1
1 255
800
1 780
500
1 200
562 SVTL 21.2
1 145
630
1 780
250
970
562 SVTL 12.1
1 255
800
1 780
500
1 260
562 SVTL HP
1 358
800
1 350
450
2 200
562 SVTL 33
1 358
800
1 350
450
2 200
562 SVTL 33 HP
1 358
800
1 350
450
2 200
650 SVTL 21.2
1 310
750
2 000
300
1 200
750 SVTL 21.2-6,3.2
1 310
750
2 000
300
1 300
750 SVTL 22-12,8
1 469
725
1 400
400
1 750
866 SVTL 22-12,8
1 469
725
1 400
400
1 800
850
,0
SV
2
SV
42
21
TL
SV
2
B
[mm]
48
7
56
TL
21
TL
21
TL
SV
0
65
100
80
22
-2
21
48
-6
7
,3
SV
-1
22
TL
0
200
SV
86
6
TL
SV
300
A
[mm]
7
12
2
56
56
2,
8
600
500
400
TL
SV
TL
TL
SV
SV
0
75
1 000
800
75
A
500
600
750
1 000 1 200 1 500 1 800
3 000 3 600
Input speed n1 in rpm
B
Rated power P1 in kW
TL
HP
22
2 000
56
-1
2
2,
8
3 000
60
50
400
33
SV
5 000
4 000
Type
C
11
SVNL, SVNL G Models
The SVNL and SVNL G models are self-supported designs in
housings split horizontally. The rotating parts are encased in
an enclosed oil-tight housing. Connecting couplings link the
main motor and driven machine with the variable speed fluid
coupling.
SVNL G variable speed fluid coupling – simplified
longitudinal section
12
3
4
5
The oil tank is built into the housing and a centrifugal pump
serves as the oil pump (some models feature a gear wheel
pump) and is driven directly by the input shaft. SVNL coupling
main shafts are equipped with antifriction bearings. The bearings are lubricated with pressurized oil.
SVNL G coupling main shafts are equipped with sleeve bearings. The bearings are force lubricated using pressurized oil.
An electrically driven auxiliary lubricating pump is attached for
priming lubrication prior to startup.
6
6
7
8
1 Pump wheel
5 Scoop tube
2 Turbine wheel
6 Cooler
3 Shell
7 Oil pump
4 Scoop tube housing
8 Oil tank
SVNL variable speed fluid coupling and simplified longitudinal section
1 2
3
5
4
7
8
12
1 Pump wheel
5 Scoop tube
2 Turbine wheel
6 Cooler
3 Shell
7 Oil pump
4 Scoop tube housing
8 Oil tank
SVNL G selection diagram
SVNL G dimensions
10 000
3G
8 000
2S
Type
620 SVNL 33 G
1 485
900
2 160
–
682 SVNL 33 G
1 485
900
2 160
–
430
3 980
1330 SVNL 12-80 G
3 150
800
2 400 1 000
2 500
12 500
1540 SVNL 12-80 G
3 150
800
2 400 1 000
2 500
13 800
VN
NL
L3
12
3G
-80
68
G
-80
12
NL
3 800
13
62
30
430
Weight
[kg]
A
0S
SV
40
SV
3 000
15
Rated power P1 in kW
4 000
2 000
VN
G
5 000
L3
6 000
Oil
capacity
[l]
A
B
C
D
[mm] [mm] [mm] [mm]
1 000
800
B
600
500
400
500 600
750
1 000 1 200 1 500 1 800
2 500 3 000 3 600
D
300
400
Input speed n1 in rpm
C
SVNL selection diagram
SVNL dimensions
Type
A
[mm]
B
[mm]
5 000
4 000
866 SVNL 22-26
1 760
1 060 1 920
780
3 650
1000 SVNL 22-32.1
1 950
1 060 1 920
780
3 650
1150 SVNL 22-32.1
1 950
1 060 1 920
780
3 800
1210 SVNL 21-32.1
1 950
1 060 1 920
780
4 000
1210 SVNL HP
1 950
1 060 1 920
780
4 000
NL
22
-2
6
8 000
600
500
400
1
12 210
10 SV
50 SVN NL H
L P
SV
10
NL 2100
32
2
.
2SV
32 1
NL
.1
22
-3
2.
1
1 000
800
Oil capacity
[l]
Weight
[kg]
A
11
300
200
100
80
60
50
400
B
Rated power P1 in kW
2 000
86
6
SV
3 000
C
[mm]
500
600
750
1 000 1 200 1 500 1 800
3 000 3 600
C
Input speed n1 in rpm
13
SVL M Model
The SVL M coupling model is a self-supported design with a
high power density. The input and output shaft are each individually encased in a cast iron housing. Connecting couplings
link the main motor and driven machine with the variable
speed fluid coupling.
Both circuits are supplied by mechanically driven pumps. An
energy-saving flow control valve is used to adjust the
circulating oil. The shafts are equipped with sleeve bearings.
The bearings are force lubricated using pressurized oil.
The oil tank is bolted to the bottom of the housing. The
coupling features two oil circuits: a working oil circuit and a
lubricating oil circuit.
SVL M model variable speed fluid coupling – simplified longitudinal section
13
4
1 2 3
7
8
12
11
10
7
1 Pump wheel
8 Circulating control valve
2 Turbine wheel
9 Auxiliary lubricating
pump
3 Shell
9
6
14
4 Coupling housing
5 Oil tank
5
6 Oil pump
7 Scoop tube
10 Working oil cooler
11 Lube oil cooler
12 Double filter
13Lubricating oil supply
14Auxiliary lubricating
pump motor
14
SVL M selection diagram
SVL M dimensions
40 000
30 000
6
0
75
10 000
68
62
4 000
5
2
0
62
2 000
0
51
1 000
2 000
SV
S
L
L
VL
SV
L
SV
L
SV
L
M
M
M
M
C
[mm]
D
Oil capacity
[mm]
[l]
Weight
[kg]
464 SVL M
1 855
720
1 540
1 280
1 460
6 700
510 SVL M
1 985
720
1 540
1 280
1 460
6 800
562 SVL M
2 045
720
1 540
1 280
1 460
6 900
620 SVL M
2 115
720
1 540
1 280
1 460
7 000
682 SVL M
2 265
720
1 540
1 280
1 460
7 100
750 SVL M
2 705
920
1 610
1 130
1 700
7 600
826 SVL M
2 910
920
1 610
1 130
1 700
8 000
A
M
M
4
3 000
B
[mm]
64
SV
L
4 000
M
5 000
B
82
SV
A
[mm]
Input speed n1 in rpm
D
Rated power P1 in kW
20 000
Type
C
15
SVNL vert. Model
The SVNL vert. model coupling is a self-supported design
featuring a vertical orientation. The rotating parts are fully
encased in the housing.
The housing can be adapted to the driven machine flange. Oil
supply is provided via a separate oil supply unit.
SVNL vert. and simplified longitudinal section
1
6
2
3
4
5
8
16
1 Pump wheel
5 Scoop tube
2 Turbine wheel
6 Cooler
3 Shell
7 Oil pump
4 Scoop tube housing
8 Oil tank
7
SVNL vert. selection diagram
SVNL vert. dimensions
B
[mm]
C
[mm]
750 SVNL vert.
1 614
1 305
1 050
866 SVNL vert.
1 614
1 305
1 180
1000 SVNL vert.
2 046
1 656
1 360
1150 SVNL vert.
2 046
1 656
1 560
Type
4 000
3 000
.
ert
NL
ert
Lv
VN
VN
6S
86
B
A
75
500
.
Lv
SV
00
10
11
50
SV
1 000
0S
NL
ver
t.
ver
t.
2 000
Rated power P1 in kW
A
[mm]
5 000
300
200
100
400
C
600
800
1 200
1 500
2 000
3 000
4 000
Input speed n1 in rpm
17
Integrating Voith Variable Speed Fluid
Couplings into a Control Circuit
Variable speed fluid couplings control the speed of the driven machines.
The couplings are often integrated into an automatic process.
Comparison of position and process control circuit
Pole wheel
with pick-up
Driven
machine
Motor
Scoop tube
position controller
Driven
machine
Motor
Scoop tube
position controller
Actuator
Scoop tube position
actual value
4 – 20 mA
Speed
measuring
transducer
Actuator
Scoop tube position
set value
4 – 20 mA
Scoop tube
position actual
value 4 – 20 mA
Scoop tube
position set
value 4 – 20 mA
Process controller
Speed
indicator
Position control circuit
• Scoop tube control drive, including position controller for
continuous control
Process
actual value
4 – 20 mA
Process
set value
4 – 20 mA
Process control circuit
Process controller
• Scoop tube actuator, including position control for
continuous control
•
A speed measurement device is required in cases where the
speed is to be used, displayed, or fed in as the process value.
As with the speed, a process value (e.g., pressure or flow rate)
can be incorporated into a control circuit. This process value
is then used as set value.
18
Voith Service – Take Advantage of the
Manufacturer’s Knowledge
Manufacturer service will increase the efficiency, safety and availability
of your system. Voith’s worldwide service network of engineers and
technicians are at your service. Voith maintains sales and service facilities
in all regions of the world.
Offices worldwide
Our services
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Installation, commissioning
Training
Maintenance
Original spare parts
Modernization, retrofits and upgrades
Service contracts
The benefits for your system
++ Improved operational reliability
++ Increased service life
++ Assured productivity
++ Optimized maintenance costs
++ Life-cycle costs you can plan on
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cr104en, S&F-nlg / WA, 6.2014, 1 000. Data and illustrations are provided for information purposes only. Subject to change.
Voith Turbo GmbH & Co. KG
Variable Speed Drives
Voithstr. 1
74564 Crailsheim, Germany
Tel. +49 7951 32-261
Fax+49 7951 32-650
vs.drives@voith.com
voith.com/vsd