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Wind energy

Sealing applications on wind energy converters

Many years of working with leading wind energy turbine manufacturers has enabled Dichtomatik to accumulate an extensive amount of experience. Way above the field of pure seal advisors, total solutions for the most varying application areas are worked out.

As far as size and ageing resistance are concerned, seals and sealing systems for wind energy turbines require very special characteristics. Dichtomatik has accumulated years of experience in special seal systems for the wind in-dustry with regard to dimen-sions, materials and design.

Sealing applications on wind energy converters:
a. the azimuth adjustment / gondola bearing
b. the pitch setting / rotor blade adjustment / rotor blade bearing
c. the main shaft bearing 
d. as well as:
–  sealing of the GFK gondola segments
–  seal systems for the braking system
–  guiding and bearing bushes; e.g. for rotor locking
–  static cover and flange sealing
–  special metal parts; e.g. fixing plates, protective shaft sleeves, flange and spacing tubes

a. Azimuth adjustment / gondola bearing
sealing site between the gondola and tower


demands:
–  counterbalancing enormous tolerances
–  bridging of great gap dimensions
–  outstanding ageing resistance
–  very good oil and lubricant resistance
–  very large diameters (up to over 3 metres)

seals used:
–  extruded special seals made of CR (chloroprene rubber) or FKM (fluorinated rubber) 
–  vulcanised joining or adhesion on site

b. Pitch setting / rotor blade adjustment / rotor blade bearing
sealing site between rotor blade and pitch bearing or rotor blade and spinner

demands:
–  counterbalancing enormous tolerances
–  particularly tight fit necessary because of great centrifugal force (additional employment of prestressed bands)
–  outstanding ageing resistance      
–  very good oil and lubricant resistance
–  very large diameters (up to 2 metres)

seals used:
–  extruded special seals made of CR (chloroprene rubber) or FKM (fluorinated rubber)
–  vulcanised joining or adhesion on site

c. Main shaft bearing front and back or rotary shaft seals in the gear box

demands:
–  outstanding ageing resistance and a long lifespan are an absolute necessity because replacing seals in an existing wind turbine is not only difficult but also expensive
–  very good oil and lubricant resistance
–  very large diameters (up to 2 metres)
–  great rigidity to prevent deformation during installation of large diameter seals

seals and components used:            
–  rotary shaft seals made of NBR, FKM
–  rotary shaft seals, reinforced versions made of NBR, FKM
–  rotary shaft seals made of rubber/fabric open or closed rings made of NBR, FKM, CR
–  rotary shaft seals with metal outer suface with additional sealing lacquer coating on outer cover
–  V-Rings made of NBR, FKM, CR
–  protective shaft sleeves made of stainless steel 1.4301, 1.4571

d. as well as:

Guiding and bearing bushes e.g. for rotor locking
–  hard fabric materials made of thin synthetic fabric and polyester resin
–  have high pressure stability which means they can absorb great transverse forces
–  good attenuation characteristics against damping
–  low wear compared to metallic materials
–  long lifespan

Bushes made of hard fabric materials are used in wind energy turbines as guiding and bearing bushes.

Sealing systems for braking systems
–  rubber/metal braking Rings made of CR and FPM, due to their good ageing and temperature resistance
–  bellow made of CR
–  O-Rings made of CR and FPM

static cover and flange sealing         
–  O-Rings made of NBR, CR and FPM
–  X-Rings made of NBR, CR and FPM

Sealing of the GFK gondola segments
–  extruded special seals and hollow seals made of CR and FPM
–  extruded clamp seals made of CR and FPM
–  extruded cord made of NBR, FPM, EPDM and MVQ by the meter or joined by vulcanisation or adhesion!

Special metal parts 
–  fixing plates, protective shaft sleeves, flange and spacing tubes
–  special metal parts made of steel
–  welded parts and large metal rings
–  prestressed bands and locks
–  use of stainless steel 1.4301 and 1.4571


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