A double curvature blade for a portion of system. The system may include a pump, such as a submersible pump. The pump may include a multiple or single stage pump. The pump may be powered by a selected motor.

A ceiling fan or similar air-moving device can include a motor for rotating one or more blades to drive a volume of air about a space. The blade can include a body having an outer surface with a flat top surface and a flat bottom surface, and a side edge. A chamfered transition can extend between one of the flat top surface or the flat bottom surface, and the side edge. The chamfered transition can include multiple chamfered edges.

A ceiling fan or similar air-moving device can include a motor for rotating one or more blades to drive a volume of air about a space. The blade can include a body having an outer surface with a flat top surface and a flat bottom surface, and a side edge. A chamfered transition can extend between one of the flat top surface or the flat bottom surface, and the side edge. The chamfered transition can include multiple chamfered edges.

A cooling fan creating a more stable airflow for heat-removing purposes, with reduced noise of operation, comprises a rotor hub and preferably an odd number of blades mounted on periphery of the rotor hub in unequal intervals. Adjacent blades are configured with different shapes, reducing the noise generated during operation without affecting the cooling effect.

A cooling fan creating a more stable airflow for heat-removing purposes, with reduced noise of operation, comprises a rotor hub and preferably an odd number of blades mounted on periphery of the rotor hub in unequal intervals. Adjacent blades are configured with different shapes, reducing the noise generated during operation without affecting the cooling effect.

A fan including a hub having a central axis; a plurality of interlock blade elements connected to the hub by means of an interlock such that each interlock blade element is prevented from moving in a radial direction with respect to the hub; and an end blade element positioned on the hub between two interlock blade elements, the end blade element being fixed to the hub to prevent movement of each interlock blade element in a circumferential direction of the hub; wherein each interlock blade element is connected to the hub by a first blade movement in a radially inward direction with respect to the hub followed by a second blade movement in a circumferential direction of the hub to establish the interlock.

A fan including a hub having a central axis; a plurality of interlock blade elements connected to the hub by means of an interlock such that each interlock blade element is prevented from moving in a radial direction with respect to the hub; and an end blade element positioned on the hub between two interlock blade elements, the end blade element being fixed to the hub to prevent movement of each interlock blade element in a circumferential direction of the hub; wherein each interlock blade element is connected to the hub by a first blade movement in a radially inward direction with respect to the hub followed by a second blade movement in a circumferential direction of the hub to establish the interlock.

The invention disclosure provides ceiling fan, comprising shell, electric machine installed in shell, electric machine connected more than three pieces, each pieces connected blade, blade comprises inner layer, outside of it connected main layer, upper and lower ends of blade layer are provided with dampproof covering layer, covering layer is arranged on upper side of blade main layer, it is aerofoil type blade, blade main layer comprises upper shell, lower shell in clamping connection with upper shell, both shell are hollow and honeycomb structure is arranged on hollow portion of both shell, a gap is formed between connecting surfaces of both shell, sealing coating is arranged in the gap, connecting spray coating is sprayed on peripheral edges of both shell. The present disclosure overcomes the shortcomings of the prior art and provides ceiling fan simple structure and environment friendliness. The invention provides method for manufacturing ceiling fan.

The invention disclosure provides ceiling fan, comprising shell, electric machine installed in shell, electric machine connected more than three pieces, each pieces connected blade, blade comprises inner layer, outside of it connected main layer, upper and lower ends of blade layer are provided with dampproof covering layer, covering layer is arranged on upper side of blade main layer, it is aerofoil type blade, blade main layer comprises upper shell, lower shell in clamping connection with upper shell, both shell are hollow and honeycomb structure is arranged on hollow portion of both shell, a gap is formed between connecting surfaces of both shell, sealing coating is arranged in the gap, connecting spray coating is sprayed on peripheral edges of both shell. The present disclosure overcomes the shortcomings of the prior art and provides ceiling fan simple structure and environment friendliness. The invention provides method for manufacturing ceiling fan.

A fan includes a motor, a rotatable hub coupled to the motor, and at least one fan blade. The at least one fan blade includes a first end coupled to the rotatable hub, a second end, a leading edge, a trailing edge, a passage extending from the first end to the second end, and a winglet attached to the second end. At least one flexible strap extends through the passage of the at least one fan blade. The flexible strap is coupled at a first end to the rotatable hub and coupled at a second end to the winglet, such as to an inner portion thereof within the passage.