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Outline
In order to study the influence of geometric dimensions of floating ring on the head and efficiency of centrifugal pumps，five different sizes of floating ring were installed on the experimental pump for ZM65-40-125 centrifugal pump. When the length of the floating ring gap was the same and the width of the ring gap was changed （0.06，0.12，0.24 mm），and the width of the floating ring gap was the same but the length of the ring gap was changed（3，5，7 mm），the changes in pump flow rate and head were compared and analyzed；Calculate the theoretical leakage flow rate at the mouth ring and compare it with the test data.The results show that as the floating wear ring clearance width increases，both pump head and efficiency decrease.When clearance width increases from 0.06 mm to 0.24 mm，the maximum head reduction is 1.19 m and maximum efficiency reduction is 4.6%.As the floating wear ring clearance length shortens，both head and efficiency decrease.When clearance length decreases from 7 mm to 3 mm，the maximum head reduction is 0.38 m and maximum efficiency reduction is 1.78%，indicating insignificant decline.These trends are essentially consistent with calculated leakage flow comparisons.This study provides reference for designing centrifugal pumps with floating wear ring structures.
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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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