In the application disclosed are a wind shroud, which is used in a fan with a movable impeller, and a fan with the same. The wind shroud is integrally formed and comprises a body configured to be internally hollowed in an axial direction of the body for receiving the movable impeller. The body comprises an air inlet end and an air outlet end, and the air inlet end has an inner sidewall and an outer sidewall spaced apart from each other to form a silencing cavity for buffering the vibration generated when the movable impeller is rotated, so as to reduce the noise of the fan. In a direction from the air inlet end to the air outlet end, a distance between the inner sidewall of the air inlet end and the outer sidewall of the air inlet end first gradually increases, and then gradually decreases. In the above manner, where the wind shroud of the present application is applied to a fan, the noise problem of the fan can be effectively addressed.

A fan impeller structure includes a hub and a blade set. The hub has a top wall and a circumferential wall extending from a circumference of the top wall. The blade set has multiple upper blades and multiple lower blades. The upper and lower blades are alternately arranged on the circumferential wall. Each upper and lower blade respectively has a first windward face and a second windward face which is extending in a different direction from the first windward face. The first windward face is disposed in such a direction as to face the rear edge of the lower blade on the lower side, while the second windward face is disposed in such a direction as to face the rear edge of the upper blade on the upper side.

The invention relates to a profiled structure, elongated in a direction in which the structure has a length exposed to an airflow, and transversely to which the structure has a leading edge (164) and/or a trailing edge, at least one of which is profiled and has, in said direction of elongation, serrations (28a) defined by successive teeth (30) and depressions (32).

Along the profiled leading edge and/or profiled trailing edge, the successive teeth (30) and depressions (32) extend only over a part of said length exposed to the flow over which the amplitude and/or spacing of the teeth varies monotonically except for the few teeth nearest each end of said part, a remaining part (280) of said length being smooth.

A centrifugal fan is provided. The centrifugal fan includes a shaft and a plurality of blades. The blades is disposed on the shaft and surround the shaft, and outer edges of the blades define a circle. The circle includes an outer region adjacent to a boundary of the circle, each of the blades includes a first contour line and a second contour line within the outer region, and the neighboring blades include an air channel therebetween, which expands toward the outer edges of the blades according to an interval expanding ratio.

A compression wheel for a turbocharger includes: a wheel hub; and a plurality of blades that are arranged around the wheel hub in a spiral shape, where a round portion is provided at a tip of a leading edge of each of the blades.

A fan section for a gas turbine engine according to an example of the present disclosure includes, among other things, a fan rotor having fan blades, and a plurality of fan exit guide vanes positioned downstream of the fan rotor. The fan rotor is configured to be driven through a gear reduction. A ratio of a number of fan exit guide vanes to a number of fan blades is defined. The fan exit guide vanes are provided with optimized sweep and optimized lean.

A disclosed fan system includes a housing having side walls, an inflow side, and an outflow side; a fan secured in the housing by a mounting; and a backflow blocker mounted to the side walls within the housing on the outflow side of the housing partially blocking a cross-sectional area of the outflow side. The backflow blocker is positioned approximately centrally in a flow path of the housing and is configured to block part of an airflow cross section such that, between side walls of the housing and side walls of the backflow blocker, an annular duct is formed as an air passage. Further, the backflow blocker has a thickness that is greater than 5% of a width of the housing, and is less than 20% of an axial design height of the fan system.

An electric motor assembly includes an electric motor, a fan assembly coupled to the electric motor and configured to rotate therewith about an axis. The fan assembly includes a hub including a cylindrical portion having an inlet end and an outlet end, the hub further including an inlet surface coupled to the inlet end. The fan assembly also includes a plurality of blades coupled to an outer periphery of the cylindrical portion, wherein the inlet surface is tapered to direct an inlet airflow toward the plurality of blades.

A housing of a centrifugal fan, a centrifugal fan and a clothes dryer; a layered structure is provided within an air duct of the housing, and the layered structure is configured to be able to divide at least a part of the air duct into at least two air layers, the width of an air layer close to a strong air end being greater than the width of an air layer close to a weak air end. Also disclosed are a centrifugal fan having the housing and a clothes dryer having the centrifugal fan. By the layered structure being disposed within the air duct, the air duct is divided into at least two air layers, and the width of the wind layer close to the strong wind end is greater than the width of the wind layer close to the weak wind end.

An axial fan for use with a wall ring plate includes a housing having an inlet region and a rotor. The rotor has an increased rotor diameter compared to a standardised rotor diameter. On the inlet side, the inlet region has a tapered section that narrows in an arched manner in a cross-sectional view from an inlet diameter to a wall ring diameter. The axial width and radial length of the tapered section are formed in a predetermined ratio.