227 e Cr269 en Voith Geared Variable Speed Couplings

7/25/2019 227 e Cr269 en Voith Geared Variable Speed Couplings

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Geared Variable-Speed Couplings


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Variable-Speed Drives

We are the experts in hydrodynamic variable-speed drives at Voith Turbo.

Voith Turbo, the specialist for hydrodynamic drive, coupling and braking systems for road,

rail and industrial applications, as well as for ship propulsion systems, is a Group Division

of Voith GmbH.

Voith is one of the largest family-owned companies in Europe with a workforce of around

39 000, with sales of EUR 5.1 billion in the 2008 / 2009 fiscal year and 280 locations world-wide. The company is active in the energy, oil and gas, paper and raw materials industries,

as well as transportation and automotive markets around the world.


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Geared variable-speed couplings

Precise control of maximum powers 2

How will you benefit? 3


with modular design 4


for high-speed driven machines 5

How to select the right coupling 6-7

How to operate the coupling 8

Product range

for high-speed driven machines 9


for low-speed driven machine 10-11


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2

Voith Turbo is the largest manufacturer of geared variable-speed

couplings worldwide. Over 4 000 drives have been supplied so far

and are operating successfully. Powers up to 60 000 kW and speeds

up to 20 000 rpm are possible. Drives with geared variable-speed

couplings are renowned all over the world for their outstanding

features and customer benefits in a wide range of applications,

i.e. in power plants, in the petrochemical industry, the chemical

industry, the iron and steel industry as well as many others.

Precise control

of maximum powers

Economical operation with excel-

lent reliability is a priority in modern

power plants. Whether they are

installed in boiler feed pump or fan

drives, in thermal power stations,

in combined cycle power plants or

nuclear power plants, Voith geared

variable-speed couplings meet

these requirements, both in the

feed water and in the cooling water

circuit of the power plant.

Controlling the speed of the driven

machine provides accurate and

energy-saving adaptation of power

to the operating point of the plant.

In pump and compressor drives in

chemical and petrochemical indus-

try, the geared variable-speed

couplings ensure that driven

machines operate more economi-

cally. Voith Turbo has the perfect

geared variable-speed coupling for

virtually all requirements be it the

smooth acceleration of motor and

driven machine or the precise and

dynamic adaptation of the speed of

driven machine.

Offshore or onshore, in extremely

hot or cold temperatures, on plat-

forms, pipeline stations or in the

desert Voith geared variable-

speed couplings have been

designed and built to withstand

rough and extreme conditions,

year after year, with a minimum

of maintenance and maximum

reliability and availability. Designs

to API specifications are available

also.


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3

Combined with a robust squirrel-

cage motor, geared variable-speed

couplings have proven themselves

as the preferred choice when com-

peting against alternative drive

systems.

Applications

Power plants Petrochemical industry Chemical industry

Boiler feed pumps

Boiler fans

Circulating pumps

Coal mills

Pipeline pumps

Crude-oil pumps

Injection pumps

Pipeline compressors

Process compressors

Compressors

Fans

Centrifugal pumps

How will you benefit?

Power savings and extension of driven machine life

compared to throttle control; lower operating costs

Precise load adaptation of driven machines due to

the high control accuracy and fast reaction times

Reliability > 99.9 %

(Evaluation based on units in operation)

Vibration damping

Relieved motor start-up and smooth acceleration

of heavy masses

Robust and compact design

Easy maintenance, low maintenance costs

Long service life


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The modular geared variable-speed

coupling is a further development

of the proven geared variable-

speed coupling design. The gear

stage and the hydrodynamic vari-

able-speed coupling are provided

in a range of separate modules but

with a common interface so that

they can be combined to provide

the optimum solution for a particular

driven machine power and speed.


with modular design

The advantages of this design

are obvious:

Increased technical flexibility

Optimum adaptation by combining

gearbox and coupling

Integrated rapid-start device

Compact design, short delivery

times

Easy maintenance

Scoop tube with electro-hydraulic actuator and

mechanically operated oil circulation control valve:

improved dynamics, increased precision, low

auxiliary power, compact design, no electro-

mechanical connecting members.

4


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PI PS PS

1

2

3

4

5

6

7

8

9

10

11

12

PDS

420 mA

Voith geared variable-speed

coupling type R..K..M

1 Gear stage

2 Hydrodynamic variable-

speed coupling

3 Scoop tube

4 Electro-hydraulic positioning

control (VEHS)

5 Working oil cooler

6 Lube oil cooler

7 Main lube oil pump

8 Oil circulation controlvalve

9 Working oil pump

10 Auxiliary lube oil pump

11 Duplex filter

12 Oil reservoir

Design and function

Voith geared variable-speed cou-

plings combine mechanical gears

and a hydrodynamic variable-

speed turbo coupling in one com-

mon housing. The oil reservoir is

bolted to the bottom of the housing.

Depending on the application or

the design, the gear stage is either

arranged on the input or on the

output side of the coupling.

The coupling fill can be varied as

needed during operation by means

of the scoop tube. As a result, the

speed and power transmitted to the

driven machine can be controlled

steplessly.

Oil supply

Both working and lube oil are

supplied from the integrated oil

tank, but have separate circuits.

The oil system can also be used

to supply both the motor and the

driven machine with lube oil.

Design

The design of a geared variable-

speed coupling is essentially

determined by the power and the

speed of the driven machine.


for high-speed driven machines

Type R..K..M

5


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60

R 120/119 GS5040

30

20

10

54

3

2

1

0,3

1 2 3 4 5 6 7 8 9 10 15 20

R120

R119

R118

R117

R 119/118 GS

R 118/117 GS600

550

500450

400R 16/17 KGS

R 18/19 KGS-14

R 110/111 KGS

R 8 KMR111

K630

R110K630

R19

KM

R18

KM

R17

KM

R16

KM

R15K

M

R14

KM

R12

KM

R10

KM

60

R 120/119 GS5040

30

20

10

54

3

2

1

0,3

1 2 3 4 5 6 7 8 9 10 15

R120

R119

R1

18

R117

R 119/118 GS

R 118/117 GS

600

550

500

450

400 R 16/17 KGS

R 18/19 KGS-14

R 110/111 KGS

R 8 K...MR

111

K630

R110

K630

R19K

M

R18K

M

R17K

M

R16K

M

R15

KM

R14K

M

R12K

M

R10K

M

put speed = 1500 rpm (50 Hz countries)

Input speed = 1800 rpm (60 Hz countries)The power diagrams show the

powers transmitted in relation to

the input and output speed for the

various coupling types and sizes.

How to select

the right coupling

Speed [rpm x 1000]

Power[kWx

1000

]

Speed [rpm x 1000]

6


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7

0

R 115 GS00

0

0

0

54

3

2

1

3

1 2 3 4 5 6 7 8 9 10 15 20

R115

R114

R113

500/450

400R 16/17 KGS

R 18/19 KGS-14

R 110/111 KGS

R111K630

R110K630

R19

KM

R18

KM

R17

KM

R16

KM

R15K

M

R14

KM

R12

KM

R10

KM

R8K

M

R 115 GSR 114 GS

R 114 GSR 113 GS

550

R 19 GS...M

R 18 GS...M

R 17 GS...M

R 16 GS...M

R 15 GS...M

60

R 115 GS5040

30

20

10

54

3

2

1

0,3

1 2 3 4 5 6 7 8 9 10 15 20

R115

R114

R113

500/450

400R 16/17 KGS

R 18/19 KGS-14

R 110/111 KGS

R111

K630

R110K630

R19

KM

R18

KM

R17

KM

R16

KM

R15K

M

R14

KM

R12

KM

R10

KM

R8K

M

R 115 GSR 114 GS

R 114 GSR 113 GS

550

R 19 GS.

R 18 GS.

R 17 GS.

R 16 GS.

R 15 GS.

put speed = 3000 rpm (50 Hz countries)

Input speed = 3600 rpm (60 Hz countries)Design to API standard are also

available. The size of the machine

then depends on the specified API

service factor.

Speed [rpm x 1000]

Power[kWx

1000

]

Speed [rpm x 1000]


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8

I

125

II

III

40%

TK[%]

100

75

50

25

0

0%

10%

20%

30%

50% 60% 70% 80%

smin

IV

50 100

4

3

2

1

100%

Performance diagramThe performance diagram shows

the transmittable coupling torques

TKat different scoop tube positions

as a function of the output speed.

The desired output speed becomes

a stable intersection between cou-

pling torque TKand load torque

(load curve).

How to operate

the coupling

Typical load characteristics:

1 constant torque

(e.g. positive displacement

pumps and compressors).

2 decreasing torque

(e.g. boiler feed pumps

operating at varying pressures).

3 parabolic torque

(e.g. resistance parabola,pumps with back pressure,

blowers).

4 decreasing torque

(e.g. boiler feed pumps

operating at fixed pressure).

Operating Ranges:

I, IV Starting Range

II Control Range

III Overload Range

The shape of the coupling charac-

teristic curves is given for informa-

tion only, since there may be minor

deviations if coupling sizes, circula-tion oil flows, oil viscosity, etc. vary.

Parameters:

Scoop tube position in %

of the full scoop-tube stroke.

TK Transmitted coupling torque

smin Minimum slip required

for torque transmission

s = (1 n2 )100 [%] n1

n1 input speed

n2 output speed

Output speed [% of input speed]


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9

Coupling types for specific applications depend on the respective

arrangement of gearbox and coupling and the power and the speed

of the motor and the driven machine.

Type R..K..M (see page 5)

A combination of step-up gear and

variable speed coupling with high

power density, step-up gearing.

Special advantages due to modular

design.

Type R..KGS

A step-up gear is integrated both

at the input and the output side for

particularly high output speeds,

e.g. for high-speed compressors.

Type R..GS

The coupling is direct-driven by the

motor and adapted to the required

speed of driven machine by the

step-up gear located at the output

side of the coupling; ideal for high

powers and extremely high speeds.

pe R..KGS

Product range

for high-speed driven machines

Type R..GS


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for low-speed driven machines

Design and function

For low-speed driven machines, the

turbo coupling is fitted with a reduc-

tion gear on the output. Coupling

and gear stage are situated in a

common housing, the lower part

of which serves as an oil reservoir.

By adding a Voith hydrodynamic

brake (optional), with an appropri-

ate breaking torque characteris-

tic, heavy masses of the drivenmachine can be rapidly decelerated.

Oil supply

Both working and lube oil are sup-

plied from the integrated oil tank.

The oil system can also be used

to supply both the motor and the

driven machine with oil.

Type R..A

The variable-speed coupling is

fitted with a helical reduction gear

on the output side. Typical driven

machines are coal mills, crushers,

low-speed pumps and fans.

Voith geared variable-speed

coupling type R..A:

1 Gear stage

2 Hydrodynamic variable-

speed coupling

3 Scoop tube (adjustable)

4 Hydrodynamic brake

(optional)

5 Oil supply6 Working oil cooler

7 Duplex filter

8 Oil pump

The control requirements of low-speed driven machines such

as coal mills, I.D. fans or crude oil pumps, vary greatly.

Depending on the application and for optimum adaptation to

the existing space conditions, the gear stage is designed as

a helical gear or bevel gear.

Type R..A

1

2

3

4

5

6

7

8


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pe R..B

Geared variable-speed

coupling type R..BType R..KGL

A step gear at the input side and

a reduction gear at the output side

make this type into a fast reacting

and compact coupling used e.g. for

fast respones times, loading pumps

and high powers.

Type R..B

This type of turbo coupling is fitted

with a step-up gear on the output

side. Geared variable-speed cou-

plings for low-speed driven machines

with high inertia, e.g. coal mills.

Type R..KGL


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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]/variable-speed

cr269en,aik-S&F/SVG,

11.2

010,

3000.

Dimensionsandillu

strationswithoutobligation.

Subjecttomodifications.

Documents

227 e Cr269 en Voith Geared Variable Speed Couplings