I made this ball and socket tilting pad journal bearing model assuming it to be used in a centrifugal compressor. I modeled everything in SolidWorks 2014 and created the animation using the Photoview 360 renderer. It includes exploded and dynamic section views to see all the inner components. This type of bearing uses pads which rest on pivots. They are free to rock or slide thereby producing the "tilt" motion. A tilt pad bearing is an example of a fluid film bearing, which uses an oil wedge to support a load without shaft-to-bearing contact.
Bearing design:
-Type of pivot: surface contact using a spherical ball
-Pivot offset: 58% asymmetrical (typical pivot offset ranges from 0.50 to 0.65)
-Preload: 0.25 (typically ranges from 0.15 to 0.75)
-Load vector orientation: load between pads (the other option available is known as load on pad)
-L/D ratio: 0.65
-5 pads (aka shoes), two of them instrumented for temperature sensing (either thermocouple or RTD)
-Pad material: Copper Chromium backing (much better thermal conductivity than steel) with Babbitt lined pads
-Babbitt type: grade 2 ASTM B23 with a bond line thickness of 1.5 mm (based on a steel backing). Unsure about how much is needed for Copper Chromium backing.
-Pad sensor location (circumferential): within the recommended 75% of the total pad arc length from the leading edge (where the maximum pressure occurs)
-Pad sensor location (axial): at the pad axial centerline (only for self-aligning pad types) where the maximum pressure and temperature occur
-Rotation of the shaft is shown via marking on the shell
-Dowel pins are used on the split line for positive realignment
-Socket head cap screws are used to join the bearing shell halves
-Installation type: pin located design using an anti-rotation steel dowel pin. Usually there are three type of configurations: pin located, flange located, and bolted flange located
-Method of lubrication: flooded design (other option is known as non-flooded)
-Oil inlet supply: using nozzles at the orifices
-Oil discharge control: using floating end seals with a drain slot on the bottom half
No comments:
New comments are not allowed.