| 摘要 |
An accessory for use with a fluid displacement machine (26) having a casing (30), an impeller (28), an impeller drive shaft (24) and a fluid intake area (32) is disclosed. The accessory comprises a secondary impeller (10) mountable for free rotation in the fluid intake area (32). A fluid displacement machine (26) including an accessory therefor and a method of guiding fluid onto the impeller (28) of a fluid displacement machine (26) is furthermore disclosed. |
