voith fluid couplings constant fill
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Voith Turbo
Voith Turbo Fluid Couplings with Constant Fill
Voith – Our Company.Voith is the reliable partner for essential industries. We set standards
around the world in our markets for paper, energy, mobility and service.
With annual sales over € 4 billion and more than 37,000 employees in
nearly 300 locations worldwide, Voith is one of the large family-owned
companies in Europe.
Markets
Our equipment, components and services allow
us to make a major contribution towards our
customers’ success. The global demand for
paper, energy, mobility and services will continue
to grow in the coming years. We will be there to
watch these markets of the future develop, and
will play our part in shaping them.
Customers
Everything we do is centered around the needs
of our customers. Our global presence and
proximity to our customers allow us to create a
working relationship based on confi dence and
trust. We want to draw on our engineering skills,
our inno vative strength and our solidity in order
to be a reliable partner for generations to come.
Paper ServiceEnergy Mobility
2
Quality, reliability and sound-
ness are the key concepts of
our identity.
These are expressed in:
Voith – Engineered reliability.
We Are Shaping the Future
People at Voith have written and re-written tech-
nical history with their ideas and developments.
Today, our products set standards around the
world. Our engineers will continue to shape the
future actively in our markets, for the benefi t of
our customers and the long-term success of our
company.
Voith Turbo Fluid Couplings – proven a million times
The Voith fluid coupling with its in-
herent hydrodynamic advantages
has proved itself by millions of sales
worldwide:
n smoothest acceleration of the
largest massesn suitable for economically priced
squirrel cage motors n load free start-up and run-up of
the motorn no motor modification requiredn torque limitation during start-upn effective shock-dampeningn overload protection for motor and
driven machinen load compensation for multi-
motor drives.
As an expert for difficult tasks in power transmission Voith Turbo
meets the steadily increasing requirements in practice and con-
vinces through innovative performance.
Constant-fill Voith fluid couplings are used with electric motors
in a wide range of applications, especially when highest powers,
economy and reliability are required.
3
4
Applications:
Material Handling and
Conveying
n Belt conveyorsn Bucket wheel elevatorsn Chain conveyors n Stackers and reclaimersn Port loading facilities
Mineral Processing Machines
n Crushersn Shreddersn Mills
Mining –
Open-pit and Underground
n Armoured face conveyorsn Stage loadersn Belt conveyorsn Tunnelling machinesn Bucket wheel excavatorsn Pumpsn Crushersn Mills
Chemical
Industry
n Centrifugesn Pumpsn Fansn Mixers
5
Foettinger’s concept – Design and function
The coupling operates on a con-
stant quantity of operating fluid,
usually mineral oil. On demand,
design for water is available.
The torque transmitted by the drive
motor is converted into kinetic en-
ergy of the operating fluid in the
pump wheel to which the motor is
con nected. In the turbine wheel, this
kinetic energy is converted back
into mechanical energy. Three
operating modes are defined:
Nominal operation
The low speed difference between
pump and turbine wheel (the so-
called nominal slip) leads to the flow
condition in the coupling becoming
stationary. Only the torque required
by the driven machine is transmit-
ted.
wheel and sets the latter in motion.
The torque development is deter-
mined by the characteristic curve of
the coupling, while the start-up
characteristics are influenced by an
appropriate arrangement of com-
pensating chambers (delay cham-
ber, annular chamber).
Standstill
The entire operating fluid in the
coupling is at rest.
Start-up
With increasing speed, the oper-
ating fluid in the working circuit is
accelerated via the pump wheel.
The circulatory flow created in this
way is supported by the turbine
The Voith Turbo Coupling is a hydrodynamic coupling based on
Foettinger’s Principle. Its main components are two bladed wheels –
a pump wheel and a turbine wheel – as well as an outer shell. Both
wheels are positioned relative to each other. Power transmission is
achieved with minimal mechanical wear and there is no mechanical
contact between the power-transmitting components.
Standstill Start-up Nominal Operation
6
Essential design factors for a fluid
coupling are the power and motor
speed. Having established the nom-
inal power and speed required, the
diagram on the right enables deter-
mination of the appropriate size of
the coupling.
Different conditions require different
starting procedures (characteristic
curve) for the coupling. Important
criteria in this respect are the mass
moment of inertia, torque limitation
and frequency of start-ups.
A suitable coupling for any drive
In the table beside different types of couplings’ starting behaviour can be compared.
Type T Type TV Type TVV Type TVVS
TM: motor torqueTL: load torqueTK: coupling torqueTN: rated torqueJ: moment of inertia
40003200
1600
800
400
250
16011075
18.511
5.5
3
1.5
0.75
0.37
300 400 600 800 1000 1500 2000 3000
0.5
1
2345
101520304050
100
200300400500
100015002000300040005000
3600
3000
1800
1500
1200
1000
900
750
2000
1200
600
200
315 1150
D11
5010
0086
675
065
056
248
742
236
6
206 D
206
154 D
154
274 D
274
4000
3730
55
22
7.5
4
2.2
1.1
1
2
0
T/TN
TM
TK
2
1.6
1.41
T/TN
TK
5 s 40 s
T/TN
TK
TM
TL1
2
0
T/TN
TM
TK
2
1.6
1.41
T/TN
TK
5 s 40 s
T/TN
TK
TM
TL1
2
0
T/TN
TM
TK
2
1.6
1.41
T/TN
TK
5 s 40 s
T/TN
TK
TM
TL
Characteristic curves
Speed Speed Time
Torque/Time behaviour
TL = const.J = const.
Run-updriven machine
Motor run-up
Example:Rated power: 55 kWInput speed: 1500 rpmCoupling size: 422 Input speed n1 [rpm]
Inpu
t pow
er P
1 [kW
]
Inpu
t pow
er P
1 [H
P]
Torq
ue
Torq
ue
Torq
ue
Size Type A D L d1 max. d2 max. l2 max. Weight1)
[mm] [kg]Type T
Type DT
154
154
206
206
274
274
366
422
487
562
650
750
866
1000
1150
1150
T
DT
T
DT
T
DT
T
T
T
T
T
T
T
T
T
DT
80
102
97
137
135
175
198
218
246
269
317
366
421
441
505
830
190
190
248
248
328
328
424
470
556
634
740
846
978
1118
1295
1295
143
165
183
223
294
334
357
391
436
490
591
529
610
651
715
1040
32
32
42
42
75
75
75
90
100
120
140
140
160
180
180
180
28
28
42
42
55
55
65
80
90
110
120
135
150
160
180
170
60
80
80
114
90
125
120
135
155
170
200
240
265
280
320
350
4
5
10
13.4
32
37
52
78
110
170
259
356
567
850
1165
1806
7
The basic type – Fluid coupling type T and DT
ød1
L
A
øDød
2
I2
Turbo Coupling Type T is the basic
ver sion of constant-fill couplings,
con sist ing of pump wheel, turbine
wheel and outer shell.
A further range has been created by
the addition of other parts to this
basic type.
The fluid coupling is normally
mounted on the machine shaft or
gearbox shaft to be driven (outer
wheel drive). In order to compen-
sate for any slight installation in-
accuracies, a flexible connecting
coupling is used to join the coupling
and input shaft.
Use of this type of fluid coupling is
recommended when vibration
damping and overload protection
are required for motor and driven
machine; they may also be used for
simpler transmission systems in the
lower performance range.
The coupling Type DT has two
coaxial work circuits operating in
parallel. By means of a double
circuit the output of the same size
coupling is effectively doubled.
Applications:n Bucket-wheel excavatorsn Bucket-wheel elevatorsn Mixing, kneading and stirring
machines
1) Weight with connecting coupling and max. oil filling.
8
Smoother start up – Fluid coupling type TV and TVV
Død
2
ød
1
l2
AL
AL
The TV version features a ”delay-fill
chamber“ which is flange-connected
to the outer wheel of the coupling.
At stand-still, a proportion of the
working fluid lies in this chamber,
thus reducing the volume in the
working circuit. Hence on motor
start-up, a reduced coupling torque
is transmitted, whilst simultaneously
providing an unloaded motor start.
After the motor has run up, the
working fluid flows from the delay-fill
chamber into the working circuit
which smoothly accelerates the
driven machine up to its operating
speed.
Furthermore, if the application so
de mands, the delay-fill chamber
can be further enlarged (type TVV),
thus enhancing its effects and fur-
ther reducing the coupling torque on
motor start, as well as resulting in
even longer and smoother start-up
of the driven machine.
In certain cases, the function of the
delay chamber can be additionally
improved through centrifugally con-
trolled valves (type TVF) or through
hydrodynamic refill (type TVY).
Applications:n Belt conveyorsn Centrifuges, decantersn Tube millsn High-inertia machinesn Crushers
Size Type A D L d1 max. d2 max. l2 max. Weight1)
[mm] [kg]
274 274 274 366 366 422 422 487 487 562 562 650 650 750 750 866 866 1000 1000 1150 1150
TVTVVDTVTVTVVTVTVVTVTVVTVTVVTVTVVTVTVVTVTVVTVTVVTVTVV
172204244225296257335297382333428384494440567493641547686670883
328 328 328 424 424 470 470 556 556 634 634 740 740 846 846 978 978 1118 1118 1295 1295
331 315 355 384 455 430 508 487 572 554 649 658 768 603 730 682 830 757 896 880 1093
75 65 65 75 75 90 90 100 100 120 120 140 140 140 140 160 160 180 180 180 180
55 55 55 65 65 80 80 90 90 110 110 120 120 135 135 150 150 160 160 180 180
90 90 125 120 120 135 135 155 155 170 170 200 200 240 240 265 265 280 280 320 320
32 33 38 56 58 80 83 111 119 172 182 259 274 364 386 570 595 870 905 1242 1334
1) Weight with connecting coupling and max. oil filling.
Type TV
Type TVV
9
The innovative one – Fluid coupling type TVVS
ød
1
L
A
Dl2 ød
2
The TVVS is a further Voith devel-
opment in cooperating an annular-
chamber shell in addition to the en-
larged delay chamber.
The additional chamber in the coup-
ling shell enables further reduction
of the starting torque. During the ini-
tial rotations of the start-up proced-
ure, centrifugal forces normally
cause the outer chamber of the
coupling to be completely filled with
operating fluid from the working
circuit.
In comparison with couplings with-
out annular chamber, filling of the
working circuit of a TVVS coupling
is considerably reduced, which, in
turn, lessens the torque transmitted
during motor run-up.
The increase in torque then follows
a gradual emptying of the fluid from
the delay chamber into the working
circuit.
The starting procedure can be
adapted to the requirements of the
application by adjustable nozzle
screws diameters.
This new con cept for couplings was
designed originally for conveyor belt
drives. Through the gradual build up
of torque an automatic adaptation to
belt load conditions is achieved.
Applications:n Belt conveyorsn High-inertia machines
Size Type A D L d1 max. d2 max. l2 max. Weight1)
[mm] [kg]
422
487
562
650
750
866
TVVS
TVVS
TVVS
TVVS
TVVS
TVVS
335
382
428
494
567
641
470
556
660
761
877
1017
508
572
649
768
730
830
90
100
120
140
140
160
80
90
110
120
135
150
135
155
170
200
240
265
87
126
192
291
404
645
1) Weight with connecting coupling and max. oil filling.
Type TVVS
10
For pulley drives – Fluid coupling type TRI and TVRI
B
D
A
ød
A
ød
t
The V-belt or flat belt pulley which
is mounted to the bearing cover
allows various transmission ratios to
be accommo dated. If required, the
pulley may be easily changed.
TRI and TVRI type fluid couplings
are normally installed on the motor
shaft in an overhung position. The
belt force is supported by a bearing
in the bearing cover on the coupling
hub.
TRI couplings can be installed both
as start-up device and overload pro-
tection. Type TVRI with additional
delay chamber is recommended if a
particularly smooth start-up is re-
quired.
Applications:n Centrifuges, decantersn Fansn Mixersn Crushers
Size Type A D B max. dt min. d max. Weight1)
[mm] [kg]
206
206
274
274
274
274
366
366
422
422
487
487
562
562
650
650
TRI
DTRI
TRI
TVRI
DTRI
DTVRI
TRI
TVRI
TRI
TVRI
TRI
TVRI
TRI
TVRI
TRI
TVRI
97
137
137
172
175
242
198
225
205
258
246
297
269
333
317
384
248
248
328
328
328
328
424
424
470
470
556
556
634
634
740
740
70
70
100
100
135
135
145
145
160
160
201
201
294
294
–
–
116
116
150
150
165
165
160
160
182
182
233
233
265
265
423
423
42
42
55
55
60
60
65
65
70
70
90
90
100
100
105
105
9
12
25
26
33
38
47
51
74
76
110
112
173
175
256
261
1) Weight with max. oil filling without pulley.
Type TRI
Type TVRI
11
Monitoring devices and accessories
MTS
Mechanical thermal switch
As protection against overheating,
fusible plugs are a standard feature.
In order to avoid loss of operating
fluid through thermal overload, a
mechanical thermal switch (MTS)
can be added. On achieving the re-
sponse temperature, the element
activates a pin which then operates
a switch. Depending on the type of
circuit, the signal can be used either
as an alarm or to switch off the
motor.
The circuit element has to be re-
placed after activation.
Mounting and removal device
Required for professional, safe in-
stallation and removal.
As well as the mechanical tool, a
hydraulic removal tool is available.
Sight glass
By fitting a sight glass, the fluid
level in the coupling can be easily
checked without opening the
coupling.
BTS
Non-contact thermal switch
Monitoring of coupling temperatures
takes place without any contact.
After activation of the switch, no re-
placement of the element is re-
quired. It is ready for use as soon
as the coupling has cooled down.
The signal can be used either as an
alarm or to switch off the motor.
12
For special applications – Additional types
Fluid coupling with
multi-disc coupling (GPK)
The design of motor and drive unit
is becoming more and more com-
pact without affecting the actual
performance of the drive. This con-
sequently leads to smaller diam-
eters of motor and gearbox shafts
which then suffer from reduced load
capacity. For such cases the weight
oft the turbo coupling is distributed
to both the driving and the driven
shaft via two discpack couplings.
The reduced load on shaft and
bearings contributes significantly to
an extended service life of bearings.
In order to provide solutions for an ever greater variety of
applications, our engineers and technicians have developed
additional types of constant-fill couplings.
Fluid coupling with
solid shaft and primary
coupling flange
The coupling is fitted rigid to the
motor shaft over a primary coupling
flange. The weight of the coupling is
thus carried by the motor shaft and
the load on the driven shaft is re-
lieved.
An elastic connecting coupling is re-
quired between the solid shaft on
the output side and the driven shaft.
By using a specially designed flex-
ible connecting coupling it is pos-
sible to fit or dismantle the coupling
radially without moving motor or
gears.
Fluid coupling with
brake flange
For use with a braking system, the
fluid coupling can be equipped with
an additional brake flange to which
a brake-drum or brake-disc can be
mounted.
13
Fluid coupling with
water as operating medium –
Type TWV...
Voith Fluid coupling – designed for
operating fluid water – can be used
in such cases, where mineral oil is
restricted of savety and ecological
reasons.
Especially in underground coal
mining the water type couplings are
preferred.
Higher power transmissions on
account of this medium is also
given.
Pulley-type coupling without
bearing cover – Type TRI/TVRI
This type is ideally suited for par-
ticularly small pulley diameters.
The pulley with integral bearing is
flanged directly to the coupling
shell.
Replacement of the belt pulley is
suggested to be done at the Voith
factory.
Fluid coupling with
overhung pulley installation –
Type TR
In this simplified version of the pul-
ley coupling, the pulley is fitted to
the coupling shell in an unsupported
version.
Fluid coupling type TR is an eco-
nomical solution for applications in
the lower power range.
cr12
8en,
SS
vG-a
ik, 0
2.20
08, 0
. Dim
ensi
ons
and
illus
trat
ions
with
out o
blig
atio
n. S
ubje
ct to
mod
ifica
tions
.
Voith Turbo GmbH & Co. KG
Startup Components
Voithstr. 1
74564 Crailsheim, Germany
Tel. +49 7951 32-409
Fax +49 7951 32-480
startup.components@voith.com
www.voithturbo.com/startup-components
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