Fluid Couplings - Brochure

1Proven a Million Times. Fluid Couplings with Constant Fill.2Foettinger’s concept – Design and function The Voith ? uid 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 mini-mal mechanical wear and there is no mechanical contact between the power-transmitting components.3The coupling operates on a constant quantity of operating fl uid, usually mineral oil. On demand, design for water is avail-able. The torque transmitted by the drive motor is converted into kinetic energy of the operating fl uid 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 defi ned:StandstillThe entire operating fl uid in the coupling is at rest.Start-upWith increasing speed, the operating fl uid in the working cir-cuit is accelerated via the pump wheel. The circulatory fl ow 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 infl uenced by an appropriate arrangement of compensating chambers (delay chamber, annular chamber).Nominal operationThe low speed difference between pump and turbine wheel (the socalled nominal slip) leads to the fl ow condition in the coupling becoming stationary. Only the torque required by the driven machine is transmitted.StandstillStart-upNominal operationPrinciple of hydrodynamic power transmission4The Voith ? uid coupling with its inherent hydrodynamic advan-tages has proved itself by millions of sales worldwide:• 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 modi? cation required• Torque limitation during start-up• Effective shock-dampening• Overload protection for motor and driven machine• Load compensation for multi-motor drivesAs an expert for dif? cult tasks in power transmission Voith meets the steadily increasing requirements in practice and convinces through innovative performance. Constant-? ll Voith ? uid couplings (turbo couplings) are used with elec-tric motors in a wide range of applications, especially when highest powers, economy and reliability are required. Voith Fluid Couplings – proven a million times1 2 31 Bucket wheel excavator in open-pit lignite mine, Czech Republic2 Belt conveyor and stacker / reclaimer in coal terminal, South Africa3 Armored face conveyor in underground coal mine, China4 Belt conveyor with TVVS coupling in open-pit copper mine, Chile 5 Belt conveyor with TVVS coupling in underground potash mine, Germany5• Crushers• Shredders• MillsApplications• Armoured face conveyors• Stage loaders• Belt conveyors• Tunnelling machines• Bucket wheel excavators• Pumps• Crushers• Mills• Centrifuges• Pumps• Fans• MixersMineral processing machinesMining: Open-pit and underground Chemical industry• Belt conveyors• Bucket wheel elevators• Chain conveyors • Stackers and reclaimers• Port loading facilitiesMaterial handling and conveying4 56Essential design factors for a fl uid 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 (char-acteristic 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 drivePerformance diagramCharacteristic curves10 000,007 000,005 000,002 000,001 000,00700,00500,00200,00100,007545,0030,0015,0010,007.503,001.500.750.370.101,003 000,005 000,0010 000,002 000,001 000,00500,00300,00200,00100,0050,0030,0015,0010,005,003,002,001,000.501 800 3 600900750300 400 600 800 1 000 1 500 2 000 3 000 4 000Input speed [rpm]Input power [kW]Input power [HP]1150 D1000 D 866 D10001150 866 750 650 562 487 422 366 274 D 206 D 154 D 274 206 15455Example: Rated power: 55 kWInput speed: 1 500 rpmCoupling size: 422T/ TNTKTMTL5 s 40 s TimeTorque / Time behaviourIn the table beside different types of couplings’ starting behaviour can be compared. Type T Type TV Type TVV Type TVVSTM: Motor torqueTL: Load torqueTK: Coupling torqueTN: Rated torqueJ: Moment of inertiaTL: Const.J: Const.TorqueT/ TNTK21,61,41SpeedRun-up driven machineTorqueSpeedT/ TNTMTK210Aceleración del motorTorque7Fluid coupling type T is the basic version of constant-fi ll couplings, consisting of pump wheel, turbine wheel and outer shell. A further range has been created by the addi-tion of other parts to this basic type. The fl uid coupling is normally mounted on the machine shaft or gearbox shaft to be driven (outer wheel drive). In order to compensate for any slight installation inaccuracies, a fl exible connecting coupling is used to join the coupling and input shaft. Use of this type of fl uid 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• Bucket-wheel excavators• Bucket-wheel elevators• Mixing, kneading and stirring machinesThe basic type – Fluid coupling type T and DTDimensionsø d1ø d2ø Dl2ALSize Types A D L d1 max. d2 max. l1 max. Weight1) [mm] [kg]154 T 80 190 143 32 28 60 4154 DT 102 190 165 32 28 80 5206 T 97 248 183 42 42 80 10206 DT 137 248 223 42 42 114 13,4274 T 135 328 202 70 55 90 27274 DT 175 328 242 70 55 125 32366 T 198 424 276 90 65 120 44422 T 218 470 320 100 80 135 68487 T 246 556 352 120 90 155 102562 T 269 634 385 130 110 170 146650 T 317 740 469 140 120 200 240750 T 366 846 529 150 135 240 358866 T 421 978 610 160 150 265 5731 000 T 441 1 118 651 180 160 280 8501 150 T 505 1 295 715 180 180 320 1 1101 150 DT 830 1 295 1 040 180 180 350 1 806Type TType DT1) Weight with connecting coupling and max. oil fi lling.8The TV version features a “delay-fi ll chamber” which is fl ange-connected to the outer wheel of the coupling. At stand-still, a proportion of the working fl uid lies in this chamber, thus reducing the volume in the working circuit. Hence on motor start-up, a reduced coupling torque is trans-mitted, whilst simultaneously providing an unloaded motor start. After the motor has run up, the working ? uid ? ows from the delay-? ll chamber into the working circuit which smoothly accelerates the driven machine up to its operating speed. Fur-thermore, if the application so de mands, the delay-? ll 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 re? ll (type TVY).Applications• Belt conveyors• Centrifuges, decanters• Tube mills• High-inertia machines• CrushersSmoother start up –Fluid coupling type TV and TVVDimensionsø d1ø d2ø Dl2AALLSize Types A D L d1 max. d2 max. l1 max. Weight1) [mm] [kg]274 TV 172 328 239 70 55 125 30274 TVV 204 328 260 42 55 90 28274 DTV 244 328 300 42 55 125 34366 TV 225 424 303 90 65 120 46366 TVV 296 424 374 90 65 120 49422 TV 257 470 359 100 80 135 71422 TVV 335 470 437 100 80 135 75487 TV 297 556 403 120 90 155 106487 TVV 382 556 488 120 90 155 114562 TV 333 634 449 130 110 170 153562 TVV 428 634 544 130 110 170 162650 TV 384 740 536 140 120 200 249650 TVV 494 740 646 140 120 200 264750 TV 440 846 603 150 135 240 373750 TVV 567 846 730 150 135 240 393866 TV 493 978 682 160 150 265 575866 TVV 641 978 830 160 150 265 6091 000 TV 547 1 118 757 180 160 280 8751 000 TVV 686 1 118 896 180 160 280 9191 150 TV 670 1 295 880 180 180 320 1 2191 150 TVV 883 1 295 1 093 180 180 320 1 3101 150 DTV 1 208 1 295 1 418 180 180 350 1 996Type TVType TVV1) Weight with connecting coupling and max. oil ? lling.9The 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 fi lled with operating fl uid from the work-ing circuit. In comparison with couplings with out annular chamber, ? lling of the working circuit of a TVVS coupling is considerably re-duced, which, in turn, lessens the torque transmitted during motor run-up. The increase in torque then follows a gradual emptying of the ? uid from the delay chamber into the working circuit. The starting procedure can be adapt ed to the require-ments of the application by adjustable nozzle screws diame-ters. 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• Belt conveyors• High-inertia machinesThe innovative one – Fluid coupling type TVVSDimensionsø d1ø d2ø Dl2ALSize Types A D L d1 max. d2 max. l1 max. Weight1) [mm] [kg]422 TVVS 335 470 437 100 80 135 83487 TVVS 382 556 488 120 90 155 128562 TVVS 428 660 544 130 110 170 185650 TVVS 494 761 646 140 120 200 301750 TVVS 567 877 730 150 135 240 454866 TVVS 641 1 017 830 160 150 265 6961000 TVVS 686 1 165 896 180 160 280 1 0101150 TVVS 883 1 340 1 093 180 180 320 1 478Type TVVS1) Weight with connecting coupling and max. oil ? lling.10The V-belt or fl at belt pulley which is mounted to the bear-ing cover allows various transmission ratios to be ac-commo dated. If required, the pulley may be easily changed. TRI and TVRI type ? uid couplings are normally installed on the motor shaft in an overhung position. The belt force is sup-ported 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 required.Applications• Centrifuges, decanters• Fans• Mixers• CrushersFor pulley drives –Fluid coupling type TRI and TVRIDimensionsø d1ø dø DAABSize Types A D B max. d1 max. d max. Weight1) [mm] [kg]206 TRI 97 248 70 116 42 9206 DTRI 137 248 70 116 42 12274 TRI 137 328 100 150 55 25274 TVRI 172 328 100 150 55 26274 DTRI 175 328 135 165 60 33274 DTVRI 242 328 135 165 60 38366 TRI 198 424 145 160 65 47366 TVRI 225 424 145 160 65 51422 TRI 205 470 160 182 70 74422 TVRI 258 470 160 182 70 76487 TRI 246 556 201 233 90 110487 TVRI 297 556 201 233 90 112562 TRI 269 634 294 265 100 173562 TVRI 333 634 294 265 100 175650 TRI 317 740 272 423 105 256650 TVRI 384 740 272 423 105 261Type TRIType TVRI1) Weight with connecting coupling and max. oil ? lling.MTS – Mechanical thermal switchAs protection against overheating, fusible plugs are a standard feature. In order to avoid loss of operating fl uid through ther-mal overload, a mechanical thermal switch (MTS) can be add-ed. On achieving the re sponse temperature, the element acti-vates 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.For inner wheel drives, we recommend the BTS non-contact thermal switch.BTS – Non-contact thermal switchMonitoring 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.Mounting and removal deviceRequired for professional, safe in stallation and removal. As well as the mechanical tool, a hydraulic removal tool is available.Sight glassBy fi tting a sight glass, the fl uid level in the coupling can be easily checked without opening the coupling.BTM – Innovative technology for process optimizationThe newly developed temperature monitoring system for fl uid coup lings “BTM”, allows increased pro cess optimization. Con-tinuous sensing of the actual temperature of the operating fl uid in the Voith Turbo fl uid coup ling represents a new capa-bility and offers two decisive benefi ts: The thermal reserves of the coup ling can be better utilized and inter vention in the pro-cess to achieve specifi c objectives is more readily accom-plished.Monitoring devices and accessories314251 MTS – Mechanical thermal switch.2 BTS – Non-contact thermal switch.3 Mounting and removal device. 4 Sight glass.5 BTM – Innovative technology for process optimization.12For special applications – Additional typesIn order to provide solutions for an ever greater variety of applications, our engineers and technicians have devel-oped additional types of constant-? ll couplings. 1 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 perform ance of the drive. This con sequently leads to smaller diam eters of motor and gearbox shafts which then suf fer from reduced load ca-pacity. For such cases the weight oft the ? uid coupling is dis-tributed to both the driving and the driven shaft via two disc-pack couplings. The reduced load on shaft and bearings contri butes signi? cantly to an extended service life of bearings. It is also possible to remove the ? uid coupling radially, without dis mantling the motor and gearbox.2 Fluid coupling with solid shaft and primary coupling ? angeThe coupling is ? tted rigid to the motor shaft over a primary coupling ? ange. The weight of the coupling is thus carried by the motor shaft and the load on the driven shaft is relieved. The ? exible connecting coupling is ? tted between the solid output shaft and the gearbox, on drives with braking systems the brake disc /drum is ? tted to the ? exible coup ling.3 Fluid coupling with brake ? angeFor use with a braking system, the ? uid coupling can be equipped with an additional brake ? ange to which a brake-drum or brake-disc can be mounted.4 Pulley-type coupling without bearing cover – Type TRI / TVRIThis type is ideally suited for par ticularly small pulley diame-ters. The pulley with integral bearing is ? anged directly to the coupling shell. Replacement of the belt pulley is suggested to be done at the Voith factory.5 Fluid coupling with overhung pulley installation – Type TRIn this simpli? ed version of the pul ley coupling, the pulley is ? tted to the coupling shell in an unsupported version. Fluid coupling type TR is an eco nomical solution for applications in the lower power range.6 Fluid coupling with water as operating medium – Type TWVoith Fluid coupling – designed for operating ? uid 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 trans-missions on account of this medium is also given.13Additional types142536Voith Turbo GmbH & Co. KGStart-up ComponentsVoithstr. 174564 Crailsheim, GermanyTel. + 49 79 51 32-409Fax + 49 79 51 32-480startup.components@voith.comvoith.comcr128en, 03.2013, aik / WA, 1 000. Data and illustrations without obligation. Subject to modifications. cr128en_1.pdf cr128en_2.pdf cr128en_3.pdf cr128en_4.pdf cr128en_5.pdf cr128en_6.pdf cr128en_7.pdf cr128en_8.pdf cr128en_9.pdf cr128en_10.pdf cr128en_11.pdf cr128en_12.pdf cr128en_13.pdf cr128en_14.pdf