An exhaust fan assembly can include an outer housing, a fan housing mounted to the outer housing, a fan wheel and an electric motor operably coupled to the fan wheel, the fan wheel and electric motor being mounted within the fan housing, wherein the fan housing defines an open inlet side for accepting airflow in a direction generally parallel to a rotational axis of the fan wheel and an outlet for discharging airflow in a direction generally perpendicular to the rotational axis, wherein the fan housing defines a volute section with an outer perimeter having a continuously curved cross-sectional shape.

Some embodiments of the present disclosure provide a shaft sleeve assembly, a blade mounting structure and an air conditioner. The shaft sleeve assembly is configured to connect a blade shaft and a motor shaft and includes: a blade shaft sleeve a first end of the blade shaft sleeve being configured to be connected with the blade shaft; and a motor shaft sleeve, a first end of the motor shaft sleeve being configured with be connected to the motor shaft and a second end of the motor shaft sleeve being connected with a second end of the blade shaft sleeve and at least one of the blade shaft sleeve and the motor shaft sleeve is an injection molded member.

A fan blade for a fan impeller is coupled to a front endring and a rear endring. The fan blade includes a first portion, a second portion, a third portion, a leading edge, and a trailing edge. The second portion is positioned on a first side of the first portion. The third portion is positioned on a second side of the first portion. The leading edge defines a leading edge blade angle and the trailing edge defines a trailing edge blade angle. The leading edge blade angle and the trailing edge blade angle are constant within the first portion and the leading edge blade angle and the trailing edge blade angle vary within the second portion and the third portion.

A method includes providing a fan unit that has an elongate housing and supports that support the fan unit on a support surface. The elongate housing has an intake, a discharge, and a hollow interior in which a blower is rotatably disposed such that when the fan unit is energized, the blower draws air from the intake into the hollow interior and discharges air from hollow interior through the discharge. The intake has a length that extends in a direction parallel to a longitudinal axis of the housing. The discharge has a length that extends in a direction parallel to the longitudinal axis of the housing. A user is directed to place the fan unit on the support surface in a manner such that the fan is supported by the supports and the longitudinal axis of the housing is horizontal.

The present invention relates to an impeller (102) for a tangential fan (100) intended to be fitted to a motor vehicle, the impeller extending chiefly in the direction of a longitudinal axis (L102) of the impeller (102), the impeller (102) having a plurality of blades (110) distributed in stages (112; 112.sub.1; 112.sub.2) along said longitudinal axis (L102) of the impeller (102), each stage (112; 112.sub.1; 112.sub.2) comprising a plurality of blades (110) angularly distributed about said longitudinal axis (L102) of the impeller (102), the blades (110) of each stage (112; 112.sub.1; 112.sub.2) of blades (110) preferably being equally angularly distributed about said longitudinal axis (L102) of the impeller (102), in which impeller the blades (110) of a first stage (112.sub.1) of blades (110) are angularly offset from the blades (110) of at least a second stage (112.sub.2) of blades (110).

Provided are a bearing assembly, a bearing assembly mounting structure and an air blowing apparatus. The bearing assembly includes: a bearing sleeve including an inner assembling face, and a bearing mounted into the bearing sleeve from an axial side of the bearing sleeve and including an outer assembling face corresponding to the inner assembling face. The inner assembling face and/or the outer assembling face is provided with a supporting structure protruding toward an opposing assembling face and cooperating with the opposing assembling face in a contacting manner, and the supporting structure is symmetrically disposed in a peripheral direction of the assembling face where the supporting structure is located.

A boss of an impeller and a rotation shaft are fastened together without partially notching or removing a blade of the impeller. A sirocco fan includes an impeller including a boss formed to protrude outward from and end face sucking air when the impeller rotates. The boss is provided with a screw hole opening, on a side face of a protruding portion of the boss, for fastening the rotation shaft with a screw.

An air conditioner includes a cross-flow fan having a cylindrical shape, and a heat exchanger disposed on an upstream side of an air flow of the cross-flow fan. The cross-flow fan includes a plurality of impellers. Each of the impellers includes a plurality of blades arranged in a circumferential direction. A clearance is formed between the cross-flow fan and the heat exchanger. The clearance has a dimension no more than 20% of a diameter of each of the impeller. The impellers are arranged with at least one of the blades displaced between each adjacent two of the impellers. A number of the impellers arranged along a rotation axis is at least 14 and no more than 30 in the cross-flow fan.

In one aspect, a fan assembly is provided that can be manufactured while producing a significantly reduced amount of scrap material. More specifically, the fan assembly utilizes a hub ring and one or more hub strips to support a plurality of blades rather than a solid center disc or end disc used by some prior approaches. In another aspect, a method is provided that includes bending a member into an annular configuration and joining end portions of the member together to rigidly fix the member in the annular configuration. The rigid annular member may be used as an end ring, a hub ring, an orifice, or other component, while producing significantly less scrap material than traditional approaches.

A drive device includes: a board including an opening; and a motor including: a rotational shaft; a housing supporting the rotational shaft for rotation, fixed to the board so as to surround the opening, and having a cylindrical shape; a bearing supporting the rotational shaft for rotation and press-fitted onto an inner peripheral surface of the housing; and a thrust cover supporting an end of the rotational shaft and fixed onto the inner peripheral surface of the housing by an adhesive.