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Ceiling fan blades for maximizing air flow at operational speeds of up to approximately 200 revolutions per minute(rpm). The blades have a positive twist at the tip ends of approximately 5 degrees to approximately 10 degrees parallel to the ceiling. The root end of the blades closest to the motor ca

Ceiling fan blades for maximizing air flow at operational speeds of up to approximately 200 revolutions per minute(rpm). The blades have a positive twist at the tip ends of approximately 5 degrees to approximately 10 degrees parallel to the ceiling. The root end of the blades closest to the motor can have a positive twist exceeding that of the tip end and can be approximately 20 to approximately 35 degrees parallel to the ceiling. The ceiling fans can have individual blade lengths of approximately 20 inches and overall spans of up to approximately 52 inches and up to approximately 54 inches. Each embodiment can use three, four, and five blades, with the blades being made of injection molded plastic. and the like. The embodiments can include built in light kit domes.

대표청구항 ▼

Ceiling fan blades for maximizing air flow at operational speeds of up to approximately 200 revolutions per minute(rpm). The blades have a positive twist at the tip ends of approximately 5 degrees to approximately 10 degrees parallel to the ceiling. The root end of the blades closest to the motor ca

Ceiling fan blades for maximizing air flow at operational speeds of up to approximately 200 revolutions per minute(rpm). The blades have a positive twist at the tip ends of approximately 5 degrees to approximately 10 degrees parallel to the ceiling. The root end of the blades closest to the motor can have a positive twist exceeding that of the tip end and can be approximately 20 to approximately 35 degrees parallel to the ceiling. The ceiling fans can have individual blade lengths of approximately 20 inches and overall spans of up to approximately 52 inches and up to approximately 54 inches. Each embodiment can use three, four, and five blades, with the blades being made of injection molded plastic. and the like. The embodiments can include built in light kit domes. 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. 10. A fluid pump as defined in claim 1, wherein each of the blade grooves has a curved section with respect to a circumferential direction of the impeller and is inclined rearward in the rotational direction of the impeller. 11. A fluid pump as defined in claim 1, wherein the blade grooves each have an opening that is tilted in a radial direction of the impeller. 12. A fluid pump as defined in claim 1, further comprising a communicating hole that extends between each of back-to-back pairs of the blade grooves that are formed within both axial end surfaces of the impeller. 13. 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. 14. A fluid pump as defined in claim 13, where in 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. 15. A fluid pump as defined in claim 14, 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. 16. A fluid pump as defined in claim 13, 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. 17. A fluid pump as defined in claim 13, wherein each of the blade grooves has a curved section with respect to a circumferential direction of the impeller and is inclined rearward in the rotational direction of the impeller. 18. A fluid pump as defined in claim 13, wherein the blade grooves each have an opening that is tilted in a radial direction of the impeller. 19. A fluid pump as defined in claim 13, further comprising a communicating hole that extends between each of back-to-back pairs of the blade grooves that are formed within both axial end surfaces of the impeller. 20. 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 p