A Theoretical Development on Lubrication Mechanism at Thrust Slide-Bearing of Scroll Compressors
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Scroll compressor
Thrust bearing
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Scroll compressor
Thrust bearing
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This study focuses on the significant effects of thrust force and friction area upon lubrication performance at the thrust slide-bearing of scroll compressors. Thrust slide-bearing models with different gas thrust forces and different friction areas were operated under pressurized conditions using R-22. The friction coefficient at the thrust slide-bearing was measured at a series of the orbiting speed. As a result, the friction coefficient significantly decreases with increasing the gas thrust force, because of increased wedge angle between the sliding surfaces. When the gas thrust force becomes quite larger under same friction area, however, the influence of solid contact becomes dominant, thus resulting in increased friction coefficient. On the other hand, when the friction area becomes smaller under increased gas thrust force, the friction coefficient remains nearly constant, because of both the effects due to decreased viscous friction and increased solid friction.
Thrust bearing
Scroll compressor
Normal force
Friction torque
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Scroll compressor
Thrust bearing
Dynamics
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Scroll compressor
Thrust bearing
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Scroll compressor
Thrust bearing
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Scroll compressor
Thrust bearing
Fluid bearing
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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.
Thrust bearing
Groove (engineering)
Air bearing
Ribbon
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Scroll compressor
Thrust bearing
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Scroll compressor
Thrust bearing
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