抄録
The objective of this paper is to design development sliding thrust bearings for screw compressors. The tests were carried out to obtain the data for bearing performance operating at an actual condition of refrigerant-blended lubricant. The thrust bearing used here is a groove type bearing with grooves on the runner and plane surface for the stationary side. The grooves are combination of spiral shape on outer side and radial shape on inner side in order to make reverse rotation possible. This bearing is named "The Ribbon Type Bearing", furthermore, the lubricating system of injection was adopted for starting torque decrease of the plain Bearing. "The Ribbon Type Bearing" is intended to achieve higher load capacity and lower bearing loss by the pumping effect and cooling effect of the both types of grooves in comparison with a conventional spiral groove bearings. The tests were carried out using pure lubricant and refrigerant blended lubricant containing refrigerant quantity of 6wt%, 10wt% and 44wt%. The operating conditions were 2500rpm rotational speed and 377kg bearing load. At that condition using 44% refrigerant blended lubricant, bearing temperature was about 74℃. The potential of the ribbon type bearings were well demonstrated.
