| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid pump easy to obtain a high lift while avoiding thickening of members.SOLUTION: A fluid pump comprises: impellers 2A, 2B rotating to raise pressure of fluid; a motor 1 for rotating the impellers 2A, 2B; a rotation transmission member 3 for transmitting rotation of the motor 1 to the impellers 2A, 2B; a space 14 in which the impellers 2A, 2B, the rotation transmission member 3 and the motor 1 exist with the fluid, respectively; and a communication passage 11 provided in the rotation transmission member 3 and providing communication between the primary side space 14 which is the introduction side of the impellers 2A, 2B, and the secondary side space 14 on the opposite side. When the fluid introduced from the primary side flows to the secondary side under high pressure, a part of the same is refluxed from the secondary side to the primary side through the communication passage 11 and a pressure rise in the secondary side is suppressed. A high lift is easily obtainable without thickening structural members of the secondary side. |
