Getting the Speed Right. Voith Variable Speed Fluid Couplings
Transcription
Getting the Speed Right. Voith Variable Speed Fluid Couplings
Getting the Speed Right. Voith Variable Speed Fluid Couplings 1 Voith sets the standards in the energy, oil & gas, paper, raw materials and transportation & automotive markets. Founded in 1867, Voith employs more than 43 000 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 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 10 000 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 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 1952. 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. 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. 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. 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 15 000 Currently in use in more than drives around the world. 4x 58 years Service life up to More than longer than a variable frequency drive. of use. Power ratings up to 10 000 kW Operating temperatures from -40°C to +50°C (ambient temperature) 5 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 1 2 3 7 6 8 6 1 Pump wheel 5 Scoop tube 2 Turbine wheel 6 Cooler 3 Shell 7 Oil pump 4 Scoop tube housing 8 Oil tank 4 5 Torque curves Operating range The performance diagram shows the transmittable coupling torques MK 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 MK and the load torque (load characteristic). Torque curves for different driven machines in the variable speed fluid coupling characteristic diagram 40 % 125 50 % 60 % 70 % 80 % 90 % 100 % III Smin 1 100 I 75 MK in % 30 % II 2 3 4 50 20 % 25 10 % IV 0 % 0 0 50 100 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 Parameters Scoop tube position in % of scoop tube stroke. M K Coupling torque SminNominal slip at design point II Control range S = (1 - n2/n1 ) · 100 [%] III Overload range n1 Input speed n2 Output speed 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 a large ith e b y a w M picture format ment here? state 8 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 Features SVTL The SVTL features a tunnel housing and shafts with antifriction bearings. SVNL SVNL G The SVNL features a housing split horizontally. Shafts in the SVNL have antifriction bearings; SVNL G is equipped with sleeve bearings. SVL M The SVL M features an especially high power density and has a cast iron housing split horizontally. The shafts are equipped with sleeve bearings. SVNL vert. The SVNL vert. is a self-supported design featuring a vertical orientation. 9 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 1 2 3 7 6 8 10 1 Pump wheel 5 Scoop tube 2 Turbine wheel 6 Cooler 3 Shell 7 Oil pump 4 Scoop tube housing 8 Oil tank 4 5 SVTL selection diagram SVTL dimensions TL 33 HP 8 000 7 000 2 56 12 SV 48 TL SV .2 2 22 TL C Oil capacity [mm] [l] Weight [kg] 422 SVTL 22-2,0 1 120 630 1 780 250 487 SVTL 22.2 1 145 630 1 780 250 900 487 SVTL 12.1 1 255 800 1 780 500 1 200 562 SVTL 21.2 1 145 630 1 780 250 970 562 SVTL 12.1 1 255 800 1 780 500 1 260 562 SVTL HP 1 358 800 1 350 450 2 200 562 SVTL 33 1 358 800 1 350 450 2 200 562 SVTL 33 HP 1 358 800 1 350 450 2 200 650 SVTL 21.2 1 310 750 2 000 300 1 200 750 SVTL 21.2-6,3.2 1 310 750 2 000 300 1 300 750 SVTL 22-12,8 1 469 725 1 400 400 1 750 866 SVTL 22-12,8 1 469 725 1 400 400 1 800 850 ,0 SV 2 SV 42 21 TL SV 2 B [mm] 48 7 56 TL 21 TL 21 TL SV 0 65 100 80 22 -2 21 48 -6 7 ,3 SV -1 22 TL 0 200 SV 86 6 TL SV 300 A [mm] 7 12 2 56 56 2, 8 600 500 400 TL SV TL TL SV SV 0 75 1 000 800 75 A 500 600 750 1 000 1 200 1 500 1 800 3 000 3 600 Input speed n1 in rpm B Rated power P1 in kW TL HP 22 2 000 56 -1 2 2, 8 3 000 60 50 400 33 SV 5 000 4 000 Type C 11 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 12 3 4 5 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. 6 6 7 8 1 Pump wheel 5 Scoop tube 2 Turbine wheel 6 Cooler 3 Shell 7 Oil pump 4 Scoop tube housing 8 Oil tank SVNL variable speed fluid coupling and simplified longitudinal section 1 2 3 5 4 7 8 12 1 Pump wheel 5 Scoop tube 2 Turbine wheel 6 Cooler 3 Shell 7 Oil pump 4 Scoop tube housing 8 Oil tank SVNL G selection diagram SVNL G dimensions 10 000 3G 8 000 2S Type 620 SVNL 33 G 1 485 900 2 160 – 682 SVNL 33 G 1 485 900 2 160 – 430 3 980 1330 SVNL 12-80 G 3 150 800 2 400 1 000 2 500 12 500 1540 SVNL 12-80 G 3 150 800 2 400 1 000 2 500 13 800 VN NL L3 12 3G -80 68 G -80 12 NL 3 800 13 62 30 430 Weight [kg] A 0S SV 40 SV 3 000 15 Rated power P1 in kW 4 000 2 000 VN G 5 000 L3 6 000 Oil capacity [l] A B C D [mm] [mm] [mm] [mm] 1 000 800 B 600 500 400 500 600 750 1 000 1 200 1 500 1 800 2 500 3 000 3 600 D 300 400 Input speed n1 in rpm C SVNL selection diagram SVNL dimensions Type A [mm] B [mm] 5 000 4 000 866 SVNL 22-26 1 760 1 060 1 920 780 3 650 1000 SVNL 22-32.1 1 950 1 060 1 920 780 3 650 1150 SVNL 22-32.1 1 950 1 060 1 920 780 3 800 1210 SVNL 21-32.1 1 950 1 060 1 920 780 4 000 1210 SVNL HP 1 950 1 060 1 920 780 4 000 NL 22 -2 6 8 000 600 500 400 1 12 210 10 SV 50 SVN NL H L P SV 10 NL 2100 32 2 . 2SV 32 1 NL .1 22 -3 2. 1 1 000 800 Oil capacity [l] Weight [kg] A 11 300 200 100 80 60 50 400 B Rated power P1 in kW 2 000 86 6 SV 3 000 C [mm] 500 600 750 1 000 1 200 1 500 1 800 3 000 3 600 C Input speed n1 in rpm 13 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 13 4 1 2 3 7 8 12 11 10 7 1 Pump wheel 8 Circulating control valve 2 Turbine wheel 9 Auxiliary lubricating pump 3 Shell 9 6 14 4 Coupling housing 5 Oil tank 5 6 Oil pump 7 Scoop tube 10 Working oil cooler 11 Lube oil cooler 12 Double filter 13Lubricating oil supply 14Auxiliary lubricating pump motor 14 SVL M selection diagram SVL M dimensions 40 000 30 000 6 0 75 10 000 68 62 4 000 5 2 0 62 2 000 0 51 1 000 2 000 SV S L L VL SV L SV L SV L M M M M C [mm] D Oil capacity [mm] [l] Weight [kg] 464 SVL M 1 855 720 1 540 1 280 1 460 6 700 510 SVL M 1 985 720 1 540 1 280 1 460 6 800 562 SVL M 2 045 720 1 540 1 280 1 460 6 900 620 SVL M 2 115 720 1 540 1 280 1 460 7 000 682 SVL M 2 265 720 1 540 1 280 1 460 7 100 750 SVL M 2 705 920 1 610 1 130 1 700 7 600 826 SVL M 2 910 920 1 610 1 130 1 700 8 000 A M M 4 3 000 B [mm] 64 SV L 4 000 M 5 000 B 82 SV A [mm] Input speed n1 in rpm D Rated power P1 in kW 20 000 Type C 15 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 1 6 2 3 4 5 8 16 1 Pump wheel 5 Scoop tube 2 Turbine wheel 6 Cooler 3 Shell 7 Oil pump 4 Scoop tube housing 8 Oil tank 7 SVNL vert. selection diagram SVNL vert. dimensions B [mm] C [mm] 750 SVNL vert. 1 614 1 305 1 050 866 SVNL vert. 1 614 1 305 1 180 1000 SVNL vert. 2 046 1 656 1 360 1150 SVNL vert. 2 046 1 656 1 560 Type 4 000 3 000 . ert NL ert Lv VN VN 6S 86 B A 75 500 . Lv SV 00 10 11 50 SV 1 000 0S NL ver t. ver t. 2 000 Rated power P1 in kW A [mm] 5 000 300 200 100 400 C 600 800 1 200 1 500 2 000 3 000 4 000 Input speed n1 in rpm 17 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 Driven machine Motor Scoop tube position controller Driven machine Motor Scoop tube position controller Actuator Scoop tube position actual value 4 – 20 mA Speed measuring transducer Actuator 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 Position control circuit • Scoop tube control drive, including position controller for continuous control Process actual value 4 – 20 mA Process set value 4 – 20 mA 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 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 • • • • • • Installation, commissioning Training Maintenance Original spare parts Modernization, retrofits and upgrades Service contracts The benefits for your system ++ Improved operational reliability ++ Increased service life ++ Assured productivity ++ Optimized maintenance costs ++ Life-cycle costs you can plan on 19 cr104en, S&F-nlg / WA, 6.2014, 1 000. Data and illustrations are provided for information purposes only. Subject to change. Voith Turbo GmbH & Co. KG Variable Speed Drives Voithstr. 1 74564 Crailsheim, Germany Tel. +49 7951 32-261 Fax+49 7951 32-650 [email protected] voith.com/vsd