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.