A propeller fan includes a cylindrical shaft portion provided on a rotation axis of the propeller fan; a plurality of blades provided on an outer peripheral side of the shaft portion; a connection portion provided adjacent to the shaft portion and connecting two of the plurality of blades that are adjacent to each other in a circumferential direction of the propeller fan; a first rib provided on at least one of a pressure surface of each of the plurality of blades and a surface of part of the connection portion that is located on a downstream side in the flow of air, and a second rib provided on at least one of a negative-pressure surface of each of the plurality of blades and a surface of part of the connection portion that is located on an upstream side in the flow of air.

A blower apparatus designed for PTAC use includes an impeller configured to be capable of rotating about a central axis; a low voltage DC motor arranged to drive the impeller; a housing configured to accommodate the motor and impeller fixed together; an inlet cover which draws fresh air into the apparatus and an outlet port that discharges the fresh air through an outlet port and at least two directional changes perpendicular to the flow of fresh air through the inlet.

An inflator for inflating an air mattress or the like may include a housing, a rotor, a stator, an electric motor, and at least one battery. The rotor may be contained within the housing and include a first circuit of fan blades and a second circuit of fan blades. The first and second circuits of fan blades may respectively generate centrifugal and axial flows of air when the electric motor rotates the rotor with respect to the stator. The stator may be contained within the housing and include a third circuit of fan blades. The at least one battery may power the electric motor. The at least one battery and the electric motor may also be contained within the housing.

A personal entertainment respiratory apparatus provides air to a user to provide a fully immersive entertainment experience. The personal entertainment system may comprise a flow generator for providing the flow of air. A personal spatial respiratory interface may be coupled to the flow generator. The personal spatial respiratory interface may comprise an outlet for the flow generator. The personal spatial respiratory interface may further be configured to direct the flow of air within an ambient breathing proximity of a user. The personal entertainment respiratory apparatus may further comprise a controller and a sensory particle dispenser. The controller and sensory particle dispenser may be configured to selectively activate release of a sensory particle from the dispenser into the directed flow of air in response to an entertainment triggering signal.

A compressor apparatus includes: an upstream portion comprising an axial-flow compressor; a downstream portion comprising a centrifugal-flow compressor; and a row of variable-stagger-angle outlet guide vanes disposed between the upstream and downstream portions.

The present invention relates to a blower unit of an air conditioner for a vehicle, which can effectively prevent water from being introduced into a motor and has a motor housing and a blower wheel improved to smoothly perform cooling of the motor. The blower unit of a two-layered air conditioner for a vehicle, which can divide and inhale indoor air and outdoor air, includes: a scroll case having an upper passageway and a lower passageway; a first blower wheel disposed in the upper passageway; a second blower wheel disposed in the lower passageway and arranged below the first blower wheel; a blower motor for rotating the first blower wheel and the second blower wheel; and a motor housing for covering the blower motor, wherein a hub for guiding air is disposed on the second blower wheel, and the hub of the second blower wheel is partially overlapped with an end portion of the motor housing.

One exemplary embodiment of this disclosure relates to a refrigerant compressor. The compressor includes an axial section having a plurality of blades and vanes and a centrifugal section having an impeller. The centrifugal section is arranged downstream of the axial section.

A refrigerant compressor according to an exemplary aspect of the present disclosure includes, among other things, a first compression stage arranged in a main refrigerant flow path. The first compression stage is a mixed compression stage having both axial and radial components. The compressor further includes a second compression stage arranged in the main refrigerant flow path downstream of the first compression stage. The second compression stage is a radial compression stage.

The invention refers to a fan system (10) comprising a fan shroud (14) and a ring fan (12) having a hub (30), a plurality of fan blades (32), and a ring structure (34). The ring structure (34) has a ring member (46) and a flange member (48), the ring member (46) having a hollow cylindrical shape, the flange member (48) extending radially outwardly from the ring member (46). The fan shroud (14) has an annular shroud flange (54), a shroud body (56) and a plurality of shroud guide vanes (58), the shroud flange (54) extending radially outwardly from the shroud body (56) and being disposed along the rotary axis (A) between the flange member (48) and the shroud body (56), the shroud body (56) being disposed about the ring member (46) and having a first body portion (70), a second body portion (72) and a divergent nozzle (74). A recirculation throttle (88) is formed by the shroud body (56) and the ring member (46) at a location where the first and second body portions (70, 72) of the shroud body (56) intersect one another. The divergent nozzle (74) and a trailing end (50) of the ring member (46) cooperate to form a dynamic sealing feature (90).

A gas turbine engine, with a conical screw integrated compression system, that utilizes at least one conical screw as an intermediary fluid transport device to facilitate the multi-staging of non-axial compressors, such as centrifugal and diagonal compressors, as well as or alternatively to combine non-axial compressors to axial compressors and to the fan. The conical screw in the compression system applies axial flow translation and funnels, as necessary, the exit flow of the impeller, fan or compressor into the next impeller or compressor.