Full
Outline
To investigate the influence of drainage holes on the operating characteristics of diffuser‑type self‑pumping hydrodynamic mechanical seals （DSPHMS），the finite difference method （FDM） was used to solve the steady‑state and perturbation Reynolds equations，analyzing the effects of drainage hole distribution circle radius，hole diameter，and operating parameters on steady‑state and dynamic sealing performance.The results show that increasing the drainage hole distribution circle radius shortens the effective action radius of the spiral grooves on the face fluid，leading to a decrease in opening force，but enhances the pumping effect of the spiral grooves on the inner leakage fluid，significantly reducing the leakage rate by 44.5%；there exists a threshold value for the drainage hole diameter （0.6 mm），when the hole diameter is less than 0.6 mm，the flow resistance of the drainage holes significantly weakens the face static pressure effect；small hole diameters （0.3 mm） limit sealing performance at high rotational speeds，while hole diameters larger than 0.3 mm improve sealing performance with increasing speed；although medium pressure can significantly increase the opening force，it reduces sealing stability.The research results provide theoretical guidance for the face design and stable operation of DSPHMS.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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