Fluid pumps

A fluid pump comprising:

• an impeller having a first axial side and a second axial side opposite of the first axial side, wherein blade grooves are defined on the first and second axial sides along the perimeter of the impeller, and
• a pump housing rotatably supporting and enclosing the impeller, the pump housing comprising:
• an inlet port that faces the first axial side of the impeller,
• an outlet port that faces the second axial side of the impeller, the impeller being disposed between the inlet port and the outlet port,
• a pump channel extending between the inlet port and the outlet port along traveling path of the blade grooves, the pump channel including a first pump channel that faces the first axial side of the impeller and a second pump channel that faces the second axial side of the impeller,
• a partition disposed between the inlet port and the outlet port,
• a channel communicating portion that couples the first pump channel with the inlet port and
• an enlarged channel portion that is defined between the partition and the channel communicating portion, the enlarged channel portion having a larger flow passage area than a flow passage area decreased by the partition, wherein a starting end of the second pump channel is located at a position displaced relative to the axis of rotation of the impeller between 8° to 30° from a starting end of the enlarged channel portion in the rotational direction of the impeller.

A fluid pump comprising:

• an impeller having a first axial side and a second axial side opposite of the first axial side, wherein blade grooves are defined on the first and second axial sides along the perimeter of the impeller, and
• a pump housing rotatably supporting and enclosing the impeller, the pump housing comprising:
• an inlet port that faces the first axial side of the impeller,
• an outlet port that faces the second axial side of the impeller, the impeller being disposed between the inlet port and the outlet port,
• a pump channel extending between the inlet port and the outlet port along a traveling path of the blade grooves, the pump channel including a first pump channel that faces the first axial side of the impeller and a second pump channel that faces the second axial side of the impeller, and
• a partition disposed between the inlet port and the outlet port, wherein a portion of the partition that is disposed proximal to and facing the second pump channel subtends a radial arc of between 25° to 45° relative to the axis of rotation of the impeller.

A fluid pump comprising:

• an impeller having a first axial side and a second axial side opposite of the first axial side, wherein blade grooves are defined on the first and second axial sides along the perimeter of the impeller, and
• a pump housing rotatably supporting and enclosing the impeller, the pump housing comprising:
• an inlet port that faces the first axial side of the impeller,
• an outlet port that faces the second axial side of the impeller, the impeller being disposed between the inlet port and the outlet port,
• a pump channel extending between the inlet port and the outlet port along a traveling path of the blade grooves, the pump channel including a first pump channel that faces the first axial side of the impeller and a second pump channel that faces the second axial side of the impeller, and
• a partition disposed between the inlet port and the outlet port, wherein a portion of the partition that is disposed proximal to and facing the first pump channel subtends a radial arc of between 60° to 80° relative to the axis of rotation of the impeller.