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| Application of magnetic fluid seal in hydraulic turbine shaft |
| Yu Zhenyan, Zhang Wei |
| School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China |
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Abstract At present the main shaft sealing device of hydraulic turbine is easy to wear and tear, and the leakage is great. In order to solve it, the magnetic fluid seal with the advantages of no contact, no wear, self-healing, long life and so on would be used on the turbine shaft. The oil-based oxide ferromagnetic fluid suitable for sealing water medium was used as sealing material and NdFeB permanent magnet material with high magnetic properties and low prices was used to provide an external magnetic field.Through simulation analysis by using analysis software of electromagnetic field, it is shown that the seal ability is the worst and first to seal fail in the places close to the shaft side in the axial seal and close to the magnetic conductor side in the radial seal, the parameters of the sealing device such as tooth and seal gap have great effect on the sealing performance which is stronger in a certain range of values of tooth and gap.Based on the result above and the characteristics of the turbine shaft seal, the magnetic fluid sealing device with rectangle tooth combined of axial and radial was designed for turbine, while number of axial total poles is 48, the radial is 20-24, the sealing pressures Δp>0.5 MPa.
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Received: 20 December 2012
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