1110 ねじ圧縮機のすべり軸受(第17報) : 冷媒用スパイラル溝スラストすべり軸受において逆回転の軸受特性(機械要素のトライボロジー,一般講演)

Abstract

The objective of this paper is to design development sliding plain bearings for hermetic screw compressors. The objective of this paper is to design development sliding plain bearings for hermetic screw compressors. 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 configuration of the bearing is named 'Ribbon Type Bearing' hereafter. At starting period, injection lubrication is applied to reduce friction torque. 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. This test was counterclockwise. The ribbon type bearing of sliding thrust bearing of test report. The tests were carried out using pure lubricant and refrigerant blended lubricant containing refrigerant quantity of 6wt%, 10wt% and 44wt%. Bearing film thickness, bearing temperature, were measured to evaluate bearing performance. The operating conditions were 2500rpm counterclockwise rotational speed and 376.7kgf bearing load. At that condition using 6wt%, 10wt%, 44w% refrigerant blended lubricant, film thickness was about 3 μm, 1.5 μm, 1 μm and bearing temperature was about 79℃, 75℃, 72℃. The potential of the ribbon type bearings were well demonstrated.