Getting the Speed Right. Voith Variable Speed Fluid Couplings

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1 Getting the Speed Right. Voith Variable Speed Fluid Couplings 1

2 Voith sets the standards in the energy, oil & gas, paper, raw materials and transportation & automotive markets. Founded in 1867, Voith employs more than 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

3 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 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 Power plants Oil and gas industry Chemical industry District heating plants Iron and steel industry Water management 3

4 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 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. 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. 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. 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

5 Currently in use in more than drives around the world. Service life up to 4x 58 longer than a variable frequency drive. More than years of use. Power ratings up to kw Operating temperatures from -40 C to +50 C (ambient temperature) 5

6 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 Pump wheel 2 Turbine wheel 3 Shell 4 Scoop tube housing 5 Scoop tube 6 Cooler 7 Oil pump 8 Oil tank 6

7 Torque curves Operating range The performance diagram shows the transmittable coupling torques M K 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 M K and the load torque (load characteristic). Torque curves for different driven machines in the variable speed fluid coupling characteristic diagram % 50 % 60 % 70 % 80 % 90 % 100 % III S min I M K in % % II % % 0 % IV 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 II Control range III Overload range Parameters Scoop tube position in % of scoop tube stroke. M K Coupling torque Nominal slip at design point S min S = (1 - n 2 /n 1 ) 100 [%] n 1 Input speed Output speed n 2 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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9 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 SVTL SVNL SVNL G SVL M SVNL vert. Features The SVTL features a tunnel housing and shafts with antifriction bearings. The SVNL features a housing split horizontally. Shafts in the SVNL have antifriction bearings; SVNL G is equipped with sleeve bearings. The SVL M features an especially high power density and has a cast iron housing split horizontally. The shafts are equipped with sleeve bearings. The SVNL vert. is a self-supported design featuring a vertical orientation. 9

10 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 Pump wheel 2 Turbine wheel 3 Shell 4 Scoop tube housing 5 Scoop tube 6 Cooler 7 Oil pump 8 Oil tank 10

11 SVTL selection diagram Rated power P 1 in kw SVTL 22-12,8 750 SVTL 21-6,3 750 SVTL 22-12,8 650 SVTL SVTL SVTL SVTL HP 562 SVTL SVTL SVTL 22-2,0 562 SVTL 33 HP 562 SVTL SVTL 12 SVTL dimensions Type A B C Oil capacity [l] Weight [kg] 422 SVTL 22-2, SVTL SVTL SVTL SVTL SVTL HP SVTL SVTL 33 HP SVTL SVTL , SVTL 22-12, SVTL 22-12, A Input speed n 1 in rpm B C 11

12 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 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 Pump wheel 2 Turbine wheel 3 Shell 4 Scoop tube housing 5 Scoop tube 6 Cooler 7 Oil pump 8 Oil tank SVNL variable speed fluid coupling and simplified longitudinal section Pump wheel 2 Turbine wheel 3 Shell 4 Scoop tube housing 5 Scoop tube 6 Cooler 7 Oil pump 8 Oil tank 12

13 SVNL G selection diagram SVNL G dimensions Type A B C D Oil capacity [l] Weight [kg] Rated power P 1 in kw SVNL G 1330 SVNL G 682 SVNL 33 G 620 SVNL 33 G 620 SVNL 33 G SVNL 33 G SVNL G SVNL G A B D Input speed n 1 in rpm C SVNL selection diagram SVNL dimensions Type A B C Oil capacity [l] Weight [kg] Rated power P 1 in kw SVNL HP 1210 SVNL SVNL SVNL SVNL SVNL SVNL SVNL SVNL SVNL HP A Input speed n 1 in rpm B C 13

14 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 Pump wheel 8 Circulating control valve Turbine wheel 3 Shell 4 Coupling housing 5 Oil tank 6 Oil pump 7 Scoop tube 9 Auxiliary lubricating pump 10 Working oil cooler 11 Lube oil cooler 12 Double filter 13 Lubricating oil supply 14 Auxiliary lubricating pump motor 14

15 SVL M selection diagram SVL M dimensions Rated power P 1 in kw SVL M 750 SVL M 682 SVL M 620 SVL M 562 SVL M 510 SVL M 464 SVL M Input speed n 1 in rpm Type A B C D Oil capacity [l] Weight [kg] 464 SVL M SVL M SVL M SVL M SVL M SVL M SVL M A D B C 15

16 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 Pump wheel 2 Turbine wheel 3 Shell 4 Scoop tube housing 5 Scoop tube 6 Cooler 7 Oil pump 8 Oil tank 16

17 SVNL vert. selection diagram SVNL vert. dimensions Type A B C SVNL vert SVNL vert SVNL vert SVNL vert Rated power P 1 in kw B A SVNL vert SVNL vert. 866 SVNL vert. 750 SVNL vert C Input speed n 1 in rpm 17

18 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 Motor Driven machine Motor Driven machine Scoop tube position controller Actuator Scoop tube position controller Actuator Speed measuring transducer Scoop tube position actual value 4 20 ma 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 Process actual value 4 20 ma Process set value 4 20 ma Position control circuit Scoop tube control drive, including position controller for continuous control 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

19 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 The benefits for your system Installation, commissioning Training Maintenance Original spare parts Modernization, retrofits and upgrades Service contracts + + Improved operational reliability + + Increased service life + + Assured productivity + + Optimized maintenance costs + + Life-cycle costs you can plan on 19

20 Voith Turbo GmbH & Co. KG Variable Speed Drives Voithstr Crailsheim, Germany Tel Fax vs.drives@voith.com voith.com/vsd cr104en, S&F-nlg / WA, , Data and illustrations are provided for information purposes only. Subject to change.