A propeller (1) includes a hub (2), blades (3), and a shell (4) having two flanks (41, 42) connected by an elbow, the blades (3) extending from the hub (2) to the shell (4). The thickness (e1, e2) of at least one part of at least one of the flanks (41, 42) of the shell (4) is reduced towards the free end of the flank.

A fan structure having integrated rotor impeller, and methods of producing the same are provided. The fan structure includes a fan housing that encircles a longitudinal axis, and defines an airflow direction from an inlet side to an exit side. The integrated rotor impeller structure is disposed to rotate within the fan housing. The integrated rotor impeller structure includes (a) a cylindrical rotor shell being annular about the longitudinal axis, and having a shell length, and (b) an axis rod coaxial with the longitudinal axis, and having an axis rod length of less than or equal to the shell length. An airflow annulus is created therebetween. A blade is disposed within the airflow annulus to extend radially from the external surface of the axis rod to the inside surface of the the cylindrical rotor shell. One or more magnets are integrated within the integrated rotor impeller structure.

A diagonal fan having an electric motor and a diagonal impeller which can be driven about an axis of rotation (RA) by means of the electric motor. The diagonal impeller determines an air inlet and an air outlet and has a hub and impeller vanes which are distributed in the circumferential direction, extend radially outwards from the hub and are surrounded radially externally by a slinger ring. A flow angle αD formed by the slinger ring relative to the axis of rotation (RA) increases from the air inlet to the air outlet, and a flow angle αN formed by the hub relative to the axis of rotation (RA) decreases from the air inlet to the air outlet.

A diagonal fan having an electric motor, a housing and a diagonal impeller generating a diagonal flow which is deflected into an axial flow direction. The diagonal impeller has impeller blades, an air inlet and an air outlet, wherein the housing forms a flow channel for an airflow generated by the diagonal impeller, which has a non-rotationally symmetric axial section and a cylindrical axial section axially directly adjacent, as seen in the flow direction, wherein an air outlet-side radial outer end of the diagonal impeller is arranged in the cylindrical axial section of the flow channel of the housing and an air gap is provided between the radial outer end and the housing, and wherein the non-rotationally symmetric axial section of the flow channel is arranged in a region of the flow channel which is adjacent to the air-inlet side of the air gap in an axial plane with the diagonal impeller.

An air-heating blower device for a passenger compartment of a motor vehicle comprising a body with at least one inlet opening at least one outlet opening an electrically driven axial fan rotatably mounted around its axis within the body. The fan is associated to an electric motor (M) with toroidal geometry, having an annular rotor which is rotatable within an annular stator and defining a central opening inside thereof, said fan (F) having one or more blades (B) which are carried by the rotor and each blade extending into said central opening towards a free end of the blade which terminates at a distance from the central axis of the fan, and in that the annular body of the rotor and/or the annular body of the stator define a guide tube for the airflow activated by the fan (F) over the resistive electric heater (H).

A fan includes a frame and an impeller including a hub, a plurality of first blades, a first ring-shaped structure, and a plurality of second blades. The first blades are disposed around the hub. The hub and the first blades are surrounded by the first ring-shaped structure connected with the ends of the first blades, and a central area is structured therebetween. The second blades are connected with an outer rim of the first ring-shaped structure. The frame includes a base, an axle tube portion disposed on the base, and a receiving portion. The impeller is disposed on the axle tube portion. The receiving portion includes plural third blades disposed around the base corresponding to the central area. The first and third blades are matched to each other to be assembled for transforming a tangent velocity into a static pressure to increase the pressure generated by the central area.

A diagonal fan having an electric motor, a housing and a diagonal impeller generating a diagonal flow which is deflected into an axial flow direction. The diagonal impeller has impeller blades, an air inlet and an air outlet, wherein the housing forms a flow channel for an airflow generated by the diagonal impeller, which has a non-rotationally symmetric axial section and a cylindrical axial section axially directly adjacent, as seen in the flow direction, wherein an air outlet-side radial outer end of the diagonal impeller is arranged in the cylindrical axial section of the flow channel of the housing and an air gap is provided between the radial outer end and the housing, and wherein the non-rotationally symmetric axial section of the flow channel is arranged in a region of the flow channel which is adjacent to the air-inlet side of the air gap in an axial plane with the diagonal impeller.

A fan of a motor vehicle is particularly suited as a main fan of an internal combustion engine. The fan has a fan wheel with an outer ring which has a substantially L-shaped ring cross section. The L-shape is defined with a radial limb and an axial limb. The radial limb has a cross-sectional enlargement on a free-end side.

A blower, comprising: a housing comprising an air inlet, a motor disposed in the housing, an axial fan configured to be driven to rotate about a fan axis and generate an air flow by the motor, a blowing tube configured to be coupled to the housing and comprising an air outlet, a duct configured to guide the air flow to the air outlet, the housing and the blowing tube comprises an air passage which comprises an upstream region between the inlet and the axial fan and a downstream region between the axial fan and the air outlet, the motor is disposed in the upstream region and the duct is disposed in the downstream region.

An axial fan includes a rotatable fan blade assembly including a plurality of fan blades, and a plurality of permanent magnets affixed to the plurality of fan blades. A stationary guide channel is located radially outboard of the fan blade assembly. A plurality of field coils are located at the guide channel and are configured to drive rotation of the fan blade assembly via magnetic interaction with the plurality of permanent magnets when the plurality of field coils are sequentially energized. A method of operating an axial fan includes energizing a plurality of field coils, urging a fan blade assembly out of contact with the guide channel via magnetic interaction between the plurality of field coils and a plurality of permanent magnets located at the fan blade assembly, and sequentially pulsing the plurality of field coils thereby urging rotation of the fan blade assembly about an axis of rotation.