A centrifugal or diagonal impeller has impeller blades (4) that are curved in the circumferential direction about an axis of rotation and are formed from a single-layer sheet metal. Each blade (4) has a suction side (11) and a pressure side (12) as well as a blade leading edge (5) and a blade trailing edge (6). At least the blade leading edge (5) of the impeller blades (4) adjacent to their suction side (11) have a geometric edge modification in the form of a rounding (7) over a predetermined partial length of a blade thickness (SD) of the impeller blades (4).

A double suction fan includes first and second rings spaced at a predetermined distance apart from and in parallel to each other, an intermediate plate disposed between the first and second rings and including a shaft hole, a plurality of first blades disposed between the first ring and the intermediate plate, a plurality of second blades disposed between the second ring and the intermediate plate, and first and second rotating hubs disposed on both side surfaces of the intermediate plate, wherein each of the first and second rotating hubs is formed of a plurality of hub plates which are disposed perpendicular to the intermediate plate around the shaft hole, and wherein the plurality of hub plates are formed to evenly distribute air introduced through the first and second rings in a longitudinal direction of the plurality of first and second blades when the intermediate plate rotates.

A cross-flow fan, and blades of a cross-flow fan are provided. The cross-flow fan includes a rotary shaft; a plurality of blades that extends in a direction parallel to the rotary shaft and having a positive pressure surface and a negative pressure surface; and a connector that connects the rotary shaft and the plurality of blades. At least one protrusion that protrudes in a thickness direction and extends in a longitudinal direction of the plurality of blades is formed on the plurality of blades, and by means of the at least one protrusion formed on a blade surface, a flow separation phenomenon caused by friction with the blade surface is suppressed, thereby reducing noise generated by the cross-flow fan.

A centrifugal or diagonal impeller has impeller blades (4) that are curved in the circumferential direction about an axis of rotation and are formed from a single-layer sheet metal. Each blade (4) has a suction side (11) and a pressure side (12) as well as a blade leading edge (5) and a blade trailing edge (6). At least the blade leading edge (5) of the impeller blades (4) adjacent to their suction side (11) have a geometric edge modification in the form of a rounding (7) over a predetermined partial length of a blade thickness (SD) of the impeller blades (4).

The present disclosure provides a warm air blower. The warm air blower comprises a shell, a support, a cross-flow wind wheel and a volute tongue, wherein the cross-flow wind wheel and the volute tongue are arranged in the shell, the cross-flow wind wheel is located between the volute tongue and the shell, and the support is connected with the shell; and the cross-flow wind wheel comprises two oppositely arranged fixed plates and a plurality of blades connected between the two fixed plates, the cross section of the blade is arc-shaped, and the range of the arc-shaped chord length is 9-10 mm. According to the technical scheme, the frequency concentration of noise is avoided, the noise intensity is reduced, and the use experience of a user is improved.

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.

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 centrifugal blower for HVACR applications includes a squirrel cage forward-curved blower fan and a scroll housing. The blower fan comprises a plurality of blades that are configured to emit air radially outward and tangentially from between the blades when the blower fan rotates at a first speed. The air so emitted has a deviation angle defined as the difference between the direction of the emitted air and the blade exit angle. The scroll housing has a spline-shaped wall that has an axial cross-section that is configured such that the deviation angle of the air emitted from the blower fan at an axial plane deviates by no more than fifteen percent circumferentially about the blower fan in-between the spline-shaped wall and the blower fan and such that the average tangential velocity of air between the spline-shaped wall and the blower fan deviates by no more than thirty percent.

A dynamically controlled cooling device for targeted cooling of a moving or stationary user includes a fan, which is rotationally mounted to a base, and a targeting device, which is in possession of the user. A first actuator is attached to the base and is operationally engaged to the fan to selectively rotate the fan. A control module is operationally engaged to the first actuator and the fan. The control module comprises a first receiver, which is Global Positioning System (GPS) enabled, and a second receiver. The targeting device comprises a third receiver, which is GPS enabled, and a transmitter. The first receiver and the third receiver receive coordinates of the fan and the user, respectively. The transmitter relays the coordinates of the user to the control module, whereupon the control module to actuates the fan and the first actuator to direct a stream of air onto the user.

The invention relates to an air intake housing (21), in particular for a heating, ventilation and/or air conditioning device, comprising: —at least two distinct air inlets (24, 26), and —air guiding members (27, 28, 30) configured to direct at least one air flow that is intended to be admitted into the air intake housing (21). According to the invention, the air guiding members comprise at least three flaps (27, 28, 30), one of these being a central flap (27) and two lateral flaps (28, 30) arranged one on each side of the central flap (27), said flaps (27, 28, 30) being positioned between the said two distinct air inlets (24, 26) of the air intake housing (21) so as to be able to move about a single axis of pivoting (33). The invention also relates to a suction blower (1) comprising such an air intake housing (21) and to a corresponding heating, ventilation and/or air conditioning device.