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| Analytical method for liquid film mechanical seals based on theory of narrow spiral groove with end effect modification |
| SONG Pengyun, CHEN Guo |
| Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China |
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Abstract In the design of upstream pumping mechanical seal with spiral grooves, the end effect in which a pressure loss occurs at the inlet of spiral grooves when the liquid is pumped into the grooves is not taken into account, causing in a significant deviation in analytical prediction from experimental observation. In order to predict the performance of a mechanical seal accurately and efficiently by an analytical method, the end effect is considered, i.e. the pressure at the spiral groove root is modified in this paper. The modified analytical expressions of liquid film pressure and opening force are obtained. The opening force is compared with the force obtained by the analytical method without end effect or with experiment or based on numerical simulation. The opening force with end effect is consistent with the experimental measurement and the numerical prediction. Compared with the numerical simulation, the mean and maximum errors in opening force are 1.9% and 6.2%, respectively, under a low pressure difference condition; compared with experimental data, however, these error increase to 8.6% and 15.5%. The averaged and maximum errors in opening force are 1.9% and 2.5% compared with numerical simulation under a high pressure difference condition. The results can provide a reference for the investigation, design and application of upstream pumping mechanical seals.
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Received: 16 December 2015
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