A propeller fan includes: a rotation-axis part that serves as a center of rotation; and a plurality of blades provided on an outer circumferential side of the rotation-axis part, the plurality of blades being joined to adjoining blades at leading edges and trailing edges thereof. A first rib projecting towards the center of rotation of the rotation-axis part to surround the rotation-axis part, and second ribs projecting towards the center of rotation to extend from the rotation-axis part toward the first rib are provided on pressure surfaces of the plurality of blades. Among ends of the second ribs in the direction of the center of rotation, the ends distant from the pressure surfaces project away from the pressure surfaces farther than an end of the first rib distant from the pressure surfaces, among the ends of the first rib in the direction of the center of rotation.

The invention relates to a fan blade (1) comprising: —an aerofoil (8) made of a composite material comprising a fibrous reinforcement densified by a polymer matrix, a leading edge (4) and a trailing edge (5), and —a structural shield (10) fitted and attached to the leading edge (4) or the training edge (5), and —at least one stiffener (20) formed integrally and in one piece with the structural shield (10), said stiffener (20) extending in a cavity (15) formed between the shield (10) and the leading edge (4) or the trailing edge (5) so as to increase a stiffness of the blade (1).

A fan blade unit and a fan impeller structure thereof. The fan blade unit includes a main body having a root section and an end section. The root section is connected with a hub. The end section extends in a radial direction away from the hub. The end section defines a first direction and a second direction. Multiple protrusion bodies are disposed at the end section and at least one channel is formed between the protrusion bodies. The channel extends in the first direction. The fan blade unit is applied to the fan impeller structure. When the fan impeller rotates, a high-pressure area is created between the channel and the wall of the outer frame of the fan, whereby the airflow is restrained from turning over from the lower wing face to the upper wing face to generate wingtip vortex.

A rotary heat exchanger includes a hub configured to be rotatably driven by a shaft, a fan including a plurality of fan blades integrally coupled to the hub and extending radially outwardly therefrom, and a heat exchanger including a plurality of heat exchanger sections. The heat exchanger includes a plurality of cooling fins for receiving air from the fan. Each of the plurality of heat exchanger sections is located between two of the plurality of fan blades. The hub, the fan, and the heat exchanger are integrally formed as a single body by a three-dimensional printing process.

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.

An airflow-doubling vane structure includes an axle, an inner vane unit, and an outer vane unit. The inner vane unit includes a plurality of vanes provided around a center defined by the axle and can be rotated along with the axle. The vanes of the inner vane unit are centrifugal vanes. The outer vane unit includes a plurality of vanes provided around the center defined by the axle and around the inner vane unit and can be rotated along with the axle. The vanes of the outer vane unit are axial-flow vanes and extend a certain radial distance from the vanes of the inner vane unit.

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.

An air-sending device includes a propeller fan to rotate about a rotational axis, and a ducted bell mouth surrounding an outboard area of the propeller fan. The propeller fan includes a plurality of blades. Each of the blades includes, in its outboard portion, a reflexed part bent upstream of an airflow that is generated in the direction of the rotational axis by rotation of the propeller fan. In the propeller fan, within an area that is closer to the trailing edge than is the near mid-chord area, the propeller fan is inclined downstream of the airflow from the inboard edge to the reflexed part. In at least a portion of an area where the cylindrical part of the bell mouth and the outboard edge of each blade face each, the reflexed part has a reflex angle of greater than or equal to 90 degrees.

The present disclosure discloses a hiding fan, the hiding fan includes a turntable, a plurality of fan blades, and a synchronization mechanism, the synchronization mechanism includes a rotation ring and a plurality of connection rods, the rotation ring is mounted on the turntable, the rotation ring can rotate relative to the turntable around a central axis of the turntable, each fan blade has an installation end and a free end, the installation end has an installation portion and a connection portion, the installation portion is mounted on the turntable through a first rotation connection portion, a first end of the connection rod is mounted on the turntable on the rotation ring through a second rotation connection portion, a second end of the connection rods is mounted on the connection portion, the fan blade can rotate around a central axis of the first rotation connection portion.

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.