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.

Paper

Energy

Mobility

Service

MarketsOur 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.

We Are Shaping the FuturePeople at Voith have written and re-written technical 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.

CustomersEverything 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.

Quality, reliability and soundness are the key concepts of our identity. These are expressed in: Voith Engineered reliability.

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Voith Turbo Fluid Couplings proven a million timesAs an expert for difficult tasks in power transmission Voith Turbo meets the steadily increasing requirements in practice and convinces 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.

The Voith fluid coupling with its inherent hydrodynamic advantages has proved itself by millions of sales worldwide:

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smoothest acceleration of the largest masses suitable for economically priced squirrel cage motors load free start-up and run-up of the motor no motor modification required torque limitation during start-up effective shock-dampening overload protection for motor and driven machine load compensation for multimotor drives.

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Applications: Material Handling and Conveyingn n n n n

Mining Open-pit and Undergroundn n n n n n n

Chemical Industryn n n n

Belt conveyors Bucket wheel elevators Chain conveyors Stackers and reclaimers Port loading facilities

Mineral Processing Machinesn n n

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Armoured face conveyors Stage loaders Belt conveyors Tunnelling machines Bucket wheel excavators Pumps Crushers Mills

Centrifuges Pumps Fans Mixers

Crushers Shredders Mills

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Foettingers concept Design and functionThe Voith Turbo Coupling is a hydrodynamic coupling based on Foettingers 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.

The coupling operates on a constant 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 energy of the operating fluid in the pump wheel to which the motor is connected. In the turbine wheel, this kinetic energy is converted back into mechanical energy. Three operating modes are defined:

Standstill

Start-up

Nominal Operation

Standstill

Nominal operation

The entire operating fluid in the coupling is at rest.Start-up

With increasing speed, the operating fluid in the working circuit is accelerated via the pump wheel. The circulatory flow created in this way is supported by the turbine

wheel and sets the latter in motion. The torque development is determined by the characteristic curve of the coupling, while the start-up characteristics are influenced by an appropriate arrangement of compensating chambers (delay chamber, annular chamber).

The low speed difference between pump and turbine wheel (the socalled nominal slip) leads to the flow condition in the coupling becoming stationary. Only the torque required by the driven machine is transmitted.

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A suitable coupling for any drive

11 50 50 D

Essential design factors for a fluid coupling are the power and motor speed. Having established the nominal power and speed required, the diagram on the right enables determination 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.

900 1000

1200

1500 1800

3000

10 0 86 0 6 75 0 65 0 56 48 2 42 7 36 2 27 6 27 4 D 20 4 20 6 D 15 6 15 4 D 4

Input power P1 [kW]

11 7.5 5.5 4 3 2.2 1.5 1.1 0.75 0.37 300 400

5 4 3 2 1 0.5

Example: Rated power: 55 kW Input speed: 1500 rpm Coupling size: 422

600 800 1000 1500 2000 Input speed n1 [rpm]

3000 4000

Characteristic curvesMotor run-up Run-up T/TN N T/TN driven machine T/T 2 2 2 1.6 1.6 1.6TK TK Torque 1.4 1.4 1.4 1 1 1 TK Torque TM T/TN N T/TN TM T/T Torque/ TM Time behaviour TK TK TK TL = const. J = const.

In the table beside different types of couplings starting behaviour can be compared.

T/T N N T/TN 2 2 2 Torque TM TM 1 TK TK 0 0 0 TK Speed TM

1 1

TL TL

TL T M: T L: T K: T N: J:

Type Type Type Type

Speed

5 s5 s 5 s

Time 40 s s 40 s 40

motor torque load torque coupling torque rated torque moment of inertia

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Input power P1 [HP] T TV TVV TVVS

4000 3200 2000 1600 1200 800 600 400 315 250 200 160 110 75 55 37 30 22 18.5

3600

750

5000 4000 3000 2000 1500 1000 500 400 300 200 100 50 40 30 20 15 10

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The basic type Fluid coupling type T and DTD I2 d2 d1

A L

Size

Type

A

D

L

d1 max. [mm] 32 32 42 42 75 75 75 90 100 120 140 140 160 180 180 180

d2 max. 28 28 42 42 55 55 65 80 90 110 120 135 150 160 180 170

l2 max. 60 80 80 114 90 125 120 135 155 170 200 240 265 280 320 350

Weight1) [kg] 4 5 10 13.4 32 37 52 78 110 170 259 356 567 850 1165 1806

Type T

154 154 206 206 274 274 366 422 487 562 650 750 866 1000 1150 11501)

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

Type DT

Weight with connecting coupling and max. oil filling.

Turbo Coupling Type T is the basic version of constant-fill couplings, consisting 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 inaccuracies, 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 n n

Bucket-wheel excavators Bucket-wheel elevators Mixing, kneading and stirring machines 7

Smoother start up Fluid coupling type TV and TVV d1

L A

l2

d2

A L

Size

Type TV TVV DTV TV TVV TV TVV TV TVV TV TVV TV TVV TV TVV TV TVV TV TVV TV TVV

A 172 204 244 225 296 257 335 297 382 333 428 384 494 440 567 493 641 547 686 670 883

D 328 328 328 424 424 470 470 556 556 634 634 740 740 846 846 978 978 1118 1118 1295 1295

L 331 315 355 384 455 430 508 487 572 554 649 658 768 603 730 682 830 757 896 880 1093

d1 max. [mm] 75 65 65 75 75 90 90 100 100 120 120 140 140 140 140 160 160 180 180 180 180

d2 max. 55 55 55 65 65 80 80 90 90 110 110 120 120 135 135 150 150 160 160 180 180

l2 max. 90 90 125 120 120 135 135 155 155 170 170 200 200 240 240 265 265 280 280 320 320

Weight1) [kg] 32 33 38 56 58 80 83 111 119 172 182 259 274 364 386 570 595 870 905 1242 1334

Type TV

Type TVV

274 274 274 366 366 422 422 487 487 562 562 650 650 750 750 866 866 1000 1000 1150 11501)

Weight with connecting coupling and max. oil filling.

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 8

chamber into the working circuit which smoothly accelerates the driven machine up to its operating speed. Furthermore, if the