A study of ceramic bearings for vertical pumps. (2nd report. Friction coefficients of submersible bearings in air and water).
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概要
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Friction coefficients of various sleeve-type submersible bearings for vertical pumps in air and water were investigated. The tested materials were SiC-sintered ceramics, WC-cemented carbides, self-fluxing alloys, and conventional bearing materials such as rubber, resin, PTFE # and soft sintered alloy. Test equipment simulated the frictional condition of the actual vertical pump shaft, that is, the shaft of the test equipment precessed to the bearing. It was clear that, in water, when silicon carbide was used as a stationary bearing, lower friction coefficients than conventional bearings could be obtained, regardless of rotating sleeve materials. In slurry, the abrasive grains had a bad influence on the friction coefficient of the conventional bearings. But, bearings of ceramics could keep low friction coefficients owing to their hardness. In air, a combination of silicon carbide and tungsten carbide showed low friction coefficient. And it is confirmed that dry start of vertical pumps can be attained with this material combination.
- 一般社団法人 日本機械学会の論文
一般社団法人 日本機械学会 | 論文
- PREFACE
- Hybrid Vibration Suppression of Flexible Structures Using Piezoelectric Elements and Analog Circuits
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