Single Stage Centrifugal Compressor Development
• Kevin Finney• Ray Zhou• Xiaoyi Li• Krishna Murty• Jinying Zhu
March 28, 2003
CompressorMotorCoupler
Single Stage Compressor
• Parts currently being manufactured by 3Dimensional Engineering in Pompano Beach– Impeller (been cast, being turned to final size)– Diffuser (on 4 axis mill now)– Inlet Guide Vane (on 4 axis mill now)
• Coupler to handle 150,000 rpm is currently under study– Coupler Corporation of America is currently working
on a design.– Working on own design here, using simple metal
sleeves with a flexible insert to absorb misalignment
Impeller (cast)
Diffuser Inlet Guide Vane
Parts being fabricated…
Manufacturing of Parts
• Progress of fabrication– Cast dimensions were faxed and were
reviewed– All casting dimensions were oversize except
one, which will not affect the performance of the compressor.
– The final dimensions of the impeller, diffuser, and inlet guide vane will adhere to the iges file dimensions.
Finish of Parts
• Impeller will be machined down to final dimension.
• Any visible voids will be spot-welded.
• Surface will be polished to reduce surface roughness.
• Diffuser and Inlet Guide Vane will be machined out of Aluminum 6061.
• Scallop height of 0.002”.
• Tolerance of Diffuser and Inlet Guide Vane will be 0.004”.
Will have three parts of each described above.
Diffuser Inside
Cooling Jacket
Flow Exit
Motor Lead Wires
Common Base
Flow Inlet
Coupler
Motor Inside
Impeller Inside
Cool Water In
Warm Water Out
Motor Shaft
Cooling Jacket Design
Bearing Jig Fixtures
ProE Model with Impeller
Machined Parts
ProE Model with Diffuser
Bearing Jig Fixtures
•Designed to properly place bearing on the impeller on both the diffuser side and the top cap side.
•Also press the impeller into the bearing in the diffuser without causing damage to bearing.
Future of Compressor Development
• Delivery of the Impellers, Diffusers, and Inlet Guide Vanes will be March 31.
• Ship Impellers to American Hoffman in West Virginia for balancing.
• Assemble compressor and begin tests at low speeds to allow for break-in of bearings.
• Test at maximum design speed of 150,000 revolutions per minute and collect data.