Variable-Speed Turbo Couplings
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Voith Variable-Speed Turbo Couplings Developed for Reliability Voith Turbo is the worldwide leading manufacturer of hydro dynamic variable-speed drives. Continuous development keeps our products at the latest state of technology. Ongoing research, state-of-the-art test equipment and a comprehensive quality assurance system form the basis of the reliability of Voith variable-speed couplings. Voith variable-speed turbo couplings are renowned all over the world for numerous features and customer benefits in the widest range of applications. Fields of applications, drives of: Power plants: Fans Pumps Chemical industry: Pumps, Fans Mixers, Centrifuges Metallurgical industry: Blowers Descaling pumps Materials handling: Slurry pumps Belt conveyors Oil & gas industry: Pumps Compressors Water industry: Water supply and waste water pumps District heating plants: Circulating pumps 5
Voith Variable-Speed Turbo Couplings Unique Advantages Strong Benefi ts Voith variable speed couplings are the optimum solution for a reliable operation of your plant. They are renowned for numerous features and customer benefits. Those are i.e. cost and energy saving, easy maintenance, long service life. They alltogether result in a unmatched total cost of ownership for the operator in a wide range of applications. Customers all over the world count on the unique range of benefits: Precise load adaptation of driven machines due to the high control accuracy and fast reaction times. Easy maintenance, low maintenance costs. Wear-free transmission of power through kinetic energy of a fl uid. Low downtimes due to extremely high reliability and availability. Mechanical separation and thus protection of motor and driven machine by dampening of torsional vibrations and shock loads. Long service life. 6
Relieved motor start-up and smooth acceleration of heavy masses results in less stress and thus a longer service life of the motor. Compact and robust design. Energy savings, lower operation cost and extension of the life time of the driven machine compared to fi xed speed. Suitable for a wide variety of en vironmental conditions (i.e. tropical climates, desert, arctic and hazardous areas). Integrated lube oil system. Lube oil supply to motor and driven machine. Optimium total cost of ownership com pared to alternative drive systems. 7
Function 1 2 4 3 7 Simplified cross section: 1 Pump wheel 2 Turbine wheel 3 Shell 4 Scoop tube housing 5 Oil sump 6 Oil circulation pump 7 Scoop tube 8 Working oil cooler Voith variable-speed turbo couplings are fluid couplings, connecting the prime mover in most cases an electric motor with the driven machine. The coupling transmits the power by means of the kinetic energy of the fluid, mostly oil. It circulates in a closed working chamber bet ween the pump wheel, connected to the in put shaft, and a turbine wheel, connected to the output shaft. 6 1 2 3 4 7 The filling grade of the operating fluid can be varied during operation between 0% and 100%, thus enabling exact and stepless speed control of the driven machine. The operating range depends on the load characteristics (torque relative to speed). 8 5 8
Voith Variable-Speed Turbo Couplings Torque Curves Operating range The performance diagram shows the transmittable coupling torques T K at different scoop tube positions as a function of the output speed. The desired output speed is the result of a stable intersection between coup ling torque T K and load torque (load curve). T K [%] 125 100 75 50 30% 20% I III 40% 50% 60% 70% 80% 100% 1 2 II 3 4 S min 25 0 10% 0% 50 100 Output speed [% of input speed] IV Torque curves of different driven machines against variable-speed turbo coupling performance curves Operating ranges: I, IV Starting range II Control range III Overload range The continuity of the curve is subject to modifications, since minor deviations of coupling size, circulation volume and oil viscosity are possible. Parameters: Scoop tube position in % of scoop tube movement. T K S min Coupling torque Minimum slip required for torque transmission S = (1 - n 2 n 1 ) 100 [%] n 1 n 2 Input speed Output speed Typical load curves: 1 Constant torque (e. g. positive displacement pumps, and compressors) 2 Decreasing torque (e. g. boiler feed pumps operating at varying pressure) 3 Parabolic torque (resistance parabola, pumps without back pressure, fans) 4 Decreasing torque (e. g. boiler feed pumps at fixed pressure operation) 9
Variable-Speed Turbo Couplings Type SVTL 1 2 3 4 7 6 8 5 Coupling type SVTL has a self-supporting design in a tunnel housing. The rotating parts are supported in the closed, oil-tight housing. Electric motor and driven machine are connected to the variable-speed turbo coup ling via connecting couplings. The oil tank is integrated into the housing, the oil pump is directly driven by the input shaft. The shafts are supported in antifriction bearings which are lubricated by a mechanically driven lube oil pump incorporated in the variable-speed coup ling. Simplified longitudinal section 1 Pump wheel 2 Turbine wheel 3 Shell 4 Scoop tube housing 5 Oil sump 6 Oil circulation pump 7 Scoop tube 8 Working oil cooler 10
Variable-speed turbo coupling type SVTL in a boiler feed pump drive. Size A B C Oil fi lling Weight 366-22 973 500 1,490 110 l 610 kg 422-22 973 500 1,490 110 l 630 kg 422-22-2,0 1,120 630 1,780 250 l 850 kg 487-21 973 500 1,490 110 l 570 kg 487-22 1,145 630 1,780 250 l 900 kg 487-12 1,255 800 1,780 500 l 1,200 kg 562-21 1,145 630 1,780 250 l 970 kg 562-12 1,255 800 1,780 500 l 1,260 kg 562-33 1,358 800 1,350 450 l 2,200 kg 562 HP 1,358 800 1,350 450 l 2,200 kg 650-21 1,310 750 2,000 300 l 1,200 kg 750-21-6,3 1,310 750 2,000 300 l 1,300 kg 750-22-12,8 1,469 725 1,400 400 l 1,750 kg* 866-22-12,8 1,469 725 1,400 400 l 1,800 kg* Dimensions in mm. * With this design, oil tank extends into base, dimension B is therefore exceeded. C A B Input power rating P 1 [kw] 7000 5000 4000 3000 2000 1000 800 600 500 400 300 200 100 80 60 50 866 SVTL 22-12,8 750 SVTL 21-6,3 750 SVTL 22-12,8 562 SVTL HP 650 SVTL 21 562 SVTL 21 562 SVTL 12 487 SVTL 21 487 SVTL 22 422 SVTL 22 366 SVTL 22 562 SVTL 33 487 SVTL 12 400 500 600 750 1000 1200 1500 1800 3000 3600 Input speed n 1 [rpm] 422 SVTL 22-2,0 Selection chart: Variable-speed turbo coupling type SVTL 11
Variable-Speed Turbo Couplings Types SVNL, SVNLG Type SVNL Type SVNLG 1 2 3 1 2 3 11 4 7 4 7 8 6 8 5 6 5 Coupling types SVNL and SVNLG are of self-supporting design with a horizontally split housing. The rotating parts are located in the completely closed, oil-tight housing. Main motor and driven machine are connected to the variable-speed turbo coupling via connecting couplings. The oil tank is integrated into the housing, a centrifugal oil pump (or, with certain designs, a gear pump) is used which is direct driven by the input shaft. With type SVNL, the main shafts are supported by antifriction bearings. The bear ings are force lubricated using pressurized oil. With type SVNLG, the main shafts are supported by sleeve bearings. The bearings are force lubricated by pressur ized oil. For pre-lubrication prior to start-up, an electric motor driven auxiliary lubrication pump is added. Simplified longitudinal section 1 Pump wheel 2 Turbine wheel 3 Shell 4 Scoop tube housing 5 Oil sump 6 Oil circulation pump 7 Scoop tube 8 Working oil cooler 12
Variable-speed turbo coupling type SVNL in a circulation pump drive. Type SVNL Size A B C Oil fi lling Weight 866-22-26 1,750 1,060 1,820 1,000 l 3,850 kg 1000-21-18,5 1,950 1,060 1,920 780 l 3,850 kg 1000-22-32 1,950 1,060 1,920 780 l 4,000 kg 1150-21-18,5 1,950 1,060 1,920 780 l 4,000 kg 1150-22-32 1,950 1,060 1,920 780 l 4,150 kg 1210-21-22,5 1,950 1,060 1,920 780 l 4,250 kg 1210-21-32 1,950 1,060 1,920 780 l 4,250 kg 1210 HP 1,950 1,060 1,920 780 l 4,250 kg Type SVNLG Size A B C Oil fi lling Weight 1330-12 3,150 800 2,400 1,500 l 12,000 kg 1330-21 3,150 800 2,400 1,500 l 10,000 kg 1390-21 3,150 800 2,400 1,500 l 11,000 kg 1540-21 3,150 800 2,400 1,500 l 12,000 kg 1780-21 3,780 900 2,900 3,000 l 16,200 kg Other sizes upon request. Dimensions in mm. A C B Input power rating P 1 [kw] 7000 5000 4000 3000 2000 1000 800 600 500 400 300 200 1210 SVNL HP 1210 SVNL 21-22,5 1150 SVNL 21-18,5 1000 SVNL 21-18,5 1210 SVNL 21-32 1150 SVNL 22-32 1000 SVNL 22-32 866 SVNL 22-26 100 80 60 50 400 500 600 750 1000 1200 1500 1800 3000 3600 Input speed n 1 [rpm] Input power rating P 1 [kw] 10000 8000 6000 5000 4000 3000 2000 1000 800 600 400 1780-21-80 1780-12-120 1540-21-50 1540-12-80 1330-12-50 1150-21-18,5 1150-22 1330-12-80 1000-22 866-22 866-22-26 300 400 500 600 900 1200 15001800 3000 3600 Input speed n 1 [rpm] 750-22 682-33 620-33 562-33 487-33 Selection chart: Variable-speed turbo coupling type SVNL Selection chart: Variable-speed turbo coupling type SVNLG 13
Variable-Speed Turbo Couplings Type SVL 1 2 3 11 4 10 8 7 9 6 5 Coupling type SVL has a self-supporting design with high power density. Input and output shafts are supported separately in a cast iron housing. Main motor and driven machine are connected to the variable-speed turbo coupling via connecting couplings. The oil sump is flanged to the housing. The coupling has two oil circuits: a working oil and a lubricating oil circuit. Both circuits are with mechanically driven pumps. A flow control valve adjusts the working oil flow to save energy. The shafts are supported in sleeve bearings which are force lubricated using pres surized oil. Simplified longitudinal section 1 Pump wheel 2 Turbine wheel 3 Shell 4 Coupling housing 5 Oil sump 6 Oil circulation pump 7 Scoop tube 8 Flow control valve 9 Auxiliary lubricating pump 10 Working oil cooler 11 Lube oil cooler 14
Variable-speed turbo coupling type 562 SVL in a crude oil/offshore pump drive. Variable-speed turbo coupling type SVL in a pipeline pump drive. 30000 10000 Input power rating P 1 [kw] 5000 682 SVL M 620 SVL M 562 SVL M 510 SVL M 1000 1000 2000 3000 4000 5000 7000 Input speed n 1 [rpm] Selection chart: Variable-speed turbo coupling type SVL modular 15
Variable-Speed Turbo Couplings Type SVTW Variable-speed water coupling type SVTW horizontal design, flanged to electric motor. SVTW horizontal. 4 6 5 9 2 3 10 1 7 8 Variable-speed turbo coupling type SVTW is operated with water instead of mineral oil as operating medium. It combines a new concept with proven technology. The coupling is directly flanged to the motor which results in compact design and easy installation. The coupling type is available both in horizontal and vertical design. Some applications are the drive of pumps in irrigation systems, in municipal water works and associated waste water systems. The pumped water can be used as operating medium. Simplified longitudinal section 1 Motor shaft 2 Coupling housing 3 Pump wheel 4 Turbine wheel 5 Shell 6 Scoop tube 7 Output shaft 8 Water supply line 9 Water return line 10 Scoop tube linkage 16
562 Electric motor (P = 600 kw, n = 990 rpm) with vertical water coupling type 866 SVTW as drive of a drinking water pump in a German waterworks. Size A B C D Weight 562 577 170 747 850 700 kg 650 738 170 930 960 847 kg 750 816 170 1,040 1,120 1,267 kg 866 1,011 210 1,273 1,350 2,040 kg 1000 1,133 250 1,415 1,500 2,990 kg 1150 vert. 1,254 250 1,586 1,720 4,450 kg 1390 vert. 1,522 300 1,894 2,065 6,750 kg Dimensions in mm. D B C A 4500 3500 2500 Input power rating P 1 [kw] 1500 1000 500 1390 vert. 1150 vert. 1000 866 750 650 100 400 600 750 900 1200 1500 1800 Input speed n 1 [rpm] Selection chart: Variable-speed turbo coupling type SVTW 17
Variable-Speed Turbo Couplings Types SVNL vert., SVNK vert. Type SVNL vert. Type SVNK vert. 1 2 3 8 1 2 3 8 4 7 4 7 5 6 5 6 Coupling type SVNL vert. is selfsupported and has a vertical design. The rotating parts are fully supported in the housing. Coupling type SVNK vert. is partly self-supported and has also been designed for vertical applications. The coupling is supported by the main motor shaft on the input side; on the output side, a bearing has been incorporated into the scoop tube housing. The housing of both types can be adapted to the flange of the driven machine. The oil supply is ensured by a separate oil supply system. Depending on the size, designs with both antifriction and sleeve bearings are available. Simplified longitudinal section 1 Pump wheel 2 Turbine wheel 3 Shell 4 Scoop tube housing 5 Oil sump 6 Oil circulation pump 7 Scoop tube 8 Working oil cooler 18
Variable-speed turbo coupling type SVNL vert. in a waste water pump drive. Size A B C min.* 487 945 775 680 562 1,250 1,030 790 650 1,250 1,030 890 750 1,614 1,305 1,050 866 1,614 1,305 1,180 1000 2,046 1,656 1,360 1150 2,046 1,656 1,560 A Type SVNL vert. dimensions in mm. Type SVNK vert. dimensions upon request. * customized to suit motor or driven machine. C B 5000 4000 3000 2000 Input power rating P 1 [kw] 1000 500 300 1150-22 1000-22 866-22 750 650 562 487 200 366 316 400 600 800 1200 2000 3000 4000 Input speed n 1 [rpm] Selection chart: Variable-speed turbo coupling type SVNL vert. 19
Integration of Voith Variable-Speed Turbo Coupling into a Control Circuit Variable-speed turbo couplings serve to control the speed of driven machines. In many cases, the couplings are integrated into an automatic process. Pole wheel with pick-up Motor Driven machine Motor Driven machine Scoop tube position controller Actuator Scoop tube position controller Actuator Speed measurement device Actual value scoop tube position 4 20 ma Set value scoop tube position 4 20 ma Actual value scoop tube position Process controller Set value scoop tube position Speed indicator Actual proces value 4 20 ma Set proces value 4 20 ma Position control circuit Process control circuit Position control circuit Process control circuit Components: Scoop tube actuator including position controller for continuous control operation Components: Process controller Scoop tube actuator including position control for continuous control operation If the speed is to be used as a pro cess value or if it is to be displayed or to be incorporated, a speed mea suring device is provided. Similar to the speed, a process value (e. g. pressure, flow, etc.) can be incorporated into a control cir cuit. Then this process value is used as set value. 20
Technical Information for Voith Variable-Speed Coupling Selection Please complete the following questionnaire as detailed as possible, in order for a detailed design of a Voith Variable- Speed Coupling to be achieved. Contact Name, Company Phone & Fax, Email 37,109 mm Required information Customer Project name Location (City, Country) Driven machine (Application; e.g. boiler feed pump) Quantity Torque characteristic parabolic constant Maximum power consumption P a of driven machine kw Motor speed n e rpm Maximum speed n a of driven machine rpm Required regulating range 100% Arrangement horizontal vertical Additional information End user Engineering company Motor power P e kw Cooling water available yes Water temperature: C no Ambient temperature: min. C (for air-oil-cooler selection) max. C fresh demineralized sea water Installation indoor outdoor Area classifi cation (in case of hazardous area) External lube oil supply requirements yes Oil flow: l/min (motor and driven machine) Temperature: C no Specifi cation, special requirements Please send the fi lled-in form by fax (+49 7951 32-650) or by email (vs.drives@voith.com) to the Voith Variable-Speed Drives team. We will get in contact with you shortly. Thank you. 21
Voith Turbo GmbH & Co. KG Variable-Speed Drives Voithstr. 1 74564 Crailsheim, Germany Tel. +49-7951 32-0 Fax +49-7951 32-650 vs.drives@voith.com www.voithturbo.com / variable-speed cr104en, 01.2010, 3.000, aik / WA. Dimensions and illustrations without obligation. Subject to modifi cations.