high speed turbine and its modification research

 

 

HE Da  jiang, ZHENG Fei yi, NIU Chun yan

 

(Hangzhou Steam Turbine Co., Ltd., Hangzhou 310022, China)

 

 

Abstract: Aiming at the large impact for approach action caused during the mesh and obvious tooth direction eccentric load for single bevel gear transmission of high speed turbine, research was carried out for the resilience & thermal deformation of singe bevel gear which caused the above phenomenon, and the modification measure applicable for the single bevel gear of high speed turbine was put forward. Two different calculation methods were adopted to compare the addendum modification height of tooth profile modification, and the relatively suitable method for calculation of addendum modification height was determined; Quantitative treatment was done for base pitch deviation and tooth shape error etc which need to be considered for the calculation of the addendum modification amount, so that the methods of profile modification and axial modification for single bevel gear of high speed turbine were ascertained. The method was applied to modify the single bevel gear for a unit of high speed gear box, and compared with the no load commissioning data of high speed gear box of the equivalent linear velocity which hadn′t yet modified. The results indicate that the noise of the modified gear box has reduced 3dB (A)~4dB (A), and the vibration has reduced 2μm~3μm. Through modification, the mesh performance of the gear has been effectively improved so as to reduce the vibration and noise.

 

Key words: high speed gear; gear modification; profile modification; axial modification