Hydro Power Turbines Engineered Success Cases
Miba Industrial Bearings
We produce hydrodynamic bearings and labyrinth seals for use in rotating equipment.
Turbine and generator manufacturers are often confronted with issues related to the project’s specific characteristics, which influence the performance of the bearings used. In fact, some of these working conditions are a great challenge to the bearing manufacturer.
Turbine or generator designs change and consequently, new requirements for bearings make a close partnership between machine and bearing designers necessary.
Since the main function of hydrodynamic sleeve bearings is to create a lifting force in an oil film developed by the shaft rotation inside the bearing. There are several key parameters affecting the oil film formation including shaft speed, oil viscosity and flow rate, load amount and direction, and the clearance between the shaft’s external diameter and the bearing’s internal diameter.
Synchronous generators - Fixed oil disc
Application: Two horizontal synchronous generators working with horizontal Francis turbine
Challenge: MIBA’s standard pedestal design, with loose oil ring, did not provide the necessary oil flow rate requested by the thrust tilting pads.
Miba decided to place the oil disk in the center of the bearing leaving the two separate thrust collars at their standard DIN bearing position, keeping the shell’s self-alignment capacity during assembly. We also decided to not feed the thrust faces directly with fresh oil, but instead feed them with the radial oil. This decision was backed by various tests and calculations. Other theories like Innes; Dowson and Tayler (3) also indicate that even if we had used two loose oil rings, they would not have supplied enough oil to the bearing therefore, Miba Industrial Bearings Brasil decided to use a fixed oil disc instead.
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The final result was a MIBA customized pedestal bearing, with water cooler in the bearing oil sump, fixed oil disk & scraper, cylindrical profile and thrust tilting trapezoidal shape pads on both sides, shaft diameter: 400 mm – ZR WFA 45- 400.?
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Since each and every application is different we want to give you a friendly reminder that a general warranty cannot be made with respect to the products, designs, data, information described, or any intellectual property contained therein. So, you can contact us, and we and we can support your specific needs.