fluid couplings

8/20/2019 Fluid Couplings

1/8

A Sophisticated Soft-start System –

Constant-fill Fluid Couplings Type TVVS


2/8

2

TVVS couplings from Voith Turbo –

perfectly smooth start-ups

Fluid couplings (turbo couplings) from Voith Turbo have proven them-selves in millions of applications. They are operating reliably all over the

world. Based on our comprehensive experience and close co-operation

with our customers, the TVVS coupling was developed: a genuine „soft-

start“ device, highly suitable for demanding drives in the material hand-

ling and processing industry.

The Voith Turbo TVVS fluid coupling provides

outstanding characteristics, such as excellentlimitation of start-up torques, as well as auto-

matic adaptation of the maximum transmittable

torque to the prevailing load. For belt conveyors,

the stresses on the belt are significantly reduced.Other benefits: higher service life of the system,

as well as low maintenance costs and downtime.

The advantages of TVVS soft-start

couplings in belt conveyor drives:

n Load-free run-up of motor

n Smooth acceleration

n Alleviation of undesirable start-up conditions

(such as lifting of belt, longitudinal vibrations,

etc.)

n Automatic adaptation of starting torque to

prevailing load situation

n Limitation of starting torque

n Higher service life of belt and other conveyor

drive components

n Utilization of economically priced, low-mainten-

ance squirrel-cage asynchronous motors

n Load sharing and step starting for multi-motor

drives


3/8

3

Powerful components

for demanding drives

Classic fields of application for the TVVS are the drives of belt con-veyors with higher capacities and lengths. During the start-up pro-

cess, the TVVS soft-start coupling ensures optimum adaptation of the

introduced torque to the prevailing load condition. The unique control

functions of the TVVS are automatic and require no external interven-

tion or modification of the filling level of the coupling.

Start-up procedure of loaded belt

conveyors:n Load-free run-up of motor

n Pre-tensioning of belt

n Smooth acceleration

n Limitation of starting torque to approximately

1.4 times the full load torque

Comparison between loaded and empty belt conveyor

Transmitted torque and output speed of

coupling

Start-up procedure of empty belt

conveyors:n Load-free run-up of motor

n Initial torque response significantly lower at

start-up than normal running condition

n Limitation of starting torque to approximately

0.8 times the full load torque

n No control system or external components

required for automatic torque adaptation

Time [s]

0 5 10 15 20 25 30 35 40 45

O u t p u t s p e e d [ r p m ]

full loaded100%

140%

Torque (loaded) Output speed (loaded)

T r a n s m i t t e d t o r q u e

full loaded100%

80%

Torque (empty)

Torque (loaded)

Output speed (empty)

Output speed (loaded)

Time [s]

1500

1250

1000

750

500

250

00 5 10 15 20 25 30 35 40 45

1500

1250

1000

750

500

250

0

O u t p u t s p e e d [ r p m ]

T r a n s m i t t e d t o r q u e

Loaded belt conveyor


4/8

4

The right design

for your drive

The various designs of Voith soft-start fluid couplings meet even themost stringent operating conditions. The housing consists either of

Silumin or spheroidal cast iron. The couplings can be operated with

mineral oil, water or fire-retardant fluids.

Apart from its main field of application, i. e. the

smooth acceleration of belt conveyors, the soft-

start coupling is primarily intended for drives

Type TVS

n High frequency of start-ups under

load

n Reversing operation

n Frequent overloads in nominal

operation

Type TUWVVFS

n High frequency of full load starts

n High break-away torque

n Frequent overloads in nominal

operation

n Internal centrifugal valve function

that responds to motor overload

or voltage drop conditions

with demanding and difficult operating conditions.

The higher thermal capacity and heat dissipation

offers you highest operating safety.

Crusher Armored-face conveyor

Whatever your operating conditions,

Voith Turbo has the right solution for you.

Type TVVYS

n Long start-up periods up to

several minutes

n Acceleration of heaviest masses

Centrifuge


5/8

5

Performance advantages

Are you planning a drive or need to modify an existing one?Your specification should include requirements such as:

We really care about the seamless integration of

our coupling into your drive. In close co-operation

with our customers and technical universities, we

have devised simulation programs which enables

Voith Turbo to calculate all important parameters

for the start-up of your drive in advance.

n Relieved run-up of motor

n Utilization of economically-priced, low-mainten-

ance squirrel-cage motors

n Smooth build-up of torque during start-up, soft

start

n Limitation of maximum torque during start-up

n Adaptation of starting torque to load torque

n Damping of vibrations and torsional shock

loads in drive line

n Multi-motor drive with load sharing

n Multi-motor drive with step starting of individual

drives

n High frequency of start-ups

n Overload protection

n Low wear factor and low-maintenance

operation

n High plant uptime availability

n Compact design

n Low noise level

In this case you have come to the right

place! A Voith TVVS soft-start coupling

will help you to fulfill even the highest

demands.


6/8

6

Function and performance

n The precisely adapted synergy of delay cham-

ber, annular chamber and nozzle screws is the

basis of the outstanding soft-start characteris-

tics.

n Apart from the delay chamber, the annular

chamber offers additional space to accommo-

date operating fluid.

n At the beginning of the start-up sequence, the

operating fluid is partly drained from the oper-

ating chamber into the annular chamber as a

result of centrifugal forces.

n The torque transmitted during the start-up se-

quence is therefore considerably lower than

with a coupling without annular chamber.

n The thermal capacity of the system is in-

creased due to the higher quantity of fluid and

additional surface area. As a result, more start-

ups can be accomplished.

Performance diagram

Dimensions (example)

Design/Function

1 Pump wheel

2 Turbine wheel

3 Operating chamber

4 Operating fluid

5 Enlarged delay chamber

6 Annular chamber

7 Field adjustable nozzlescrews

5

17

3

2

6 43200

200016001200

800600

400

250200150

110

755545

3022

1511

7.55.5

43

2.2

1.51.1

0.750.55

0.37

40003000

2000

15001000

500400300

200

100

504030

2015

10

543

2

1

0.5

360018001200900750

300 400 600 800 1000 1500 2000 3000 4000

Input speed [rpm]

R a t e d i n p u t p o w e r [ k W ]

R a t e d i n p u t p o w e r [ H P ] 1 1

5 0

1 0 0 0

8 6 6

7 5 0

6 5 0

5 6 2

4 8 7

4 2 2

Size A D L d1 max. d2 max. l2 Weight*

422 335 470 437 100 80 135 83 kg

487 382 556 488 120 90 155 128 kg

562 428 660 544 130 110 170 185 kg

650 494 761 646 140 120 200 301 kg

750 567 877 730 150 135 240 454 kg

866 641 1017 830 160 150 265 696 kg

1000 686 1165 869 180 160 280 1010 kg

1150 883 1340 1093 180 180 320 1478 kg

Dimensions in mm.

*Including flexible connecting couplings and maximum oil filling.L

A

l2

ø d 2

D ø d 1


7/8

Gearbox shaft mounted design with flexible connecting coupling

nCompact design for short shaft distances

n

Easy aligning

Load distributed design with multi-disc coupling

n

Coupling on motor shaftn Radial installation and removal

Motor shaft supported design with flexible connecting coupling

n

Weight distribution on motor and gearbox shaft

n Easy assembly

n Generous misalignment tolerances

n Radial installation and removal

n Wear and maintenance-free multi-disc connecting

couplings with high service life

n Excellently suited for retrofits, easy longitudinal

adaptation with existing plants

Belt pulley design

nCoupling on motor shaft

n Increased V-belt lifetime

Installation and connecting technology

7


8/8

Voith Turbo GmbH & Co. KG

Start-up Components

Voithstr. 1

74564 Crailsheim, Germany

Tel. +49 7951 32-409

Fax +49 7951 32-480

[email protected]/startup-components

fluid couplings

Documents