Abstract: A centrifugal fan includes: an impeller having a back plate; and a scroll casing including a peripheral wall having a volute shape, a first side wall facing a virtual extension of the back plate and an inner end portion of the volute shape of the scroll casing, an expanded portion, and a first edge end portion being an end of a first edge defining the discharge port, of the first side wall, are arranged in a named order in the rotation direction, the first edge end portion being farther from the rotation shaft than an other end of the first edge and distance L1?distance LM>distance LS is satisfied where LS is a distance between the first side wall at the inner end portion of the volute shape and the virtual extension of the back plate, LM is a distance between the first side wall at the expanded portion and the virtual extension of the back plate, the expanded portion being a portion at which the distance between the first side wall and the virtual extension of the back plate is larger than LS, and L1 is a

Abstract: A downhole gas separator fluid mover assembly comprising a fluid mover having an inlet and an outlet, a separation device, a separation chamber, and a flow path separator located downstream of the fluid mover. The fluid mover comprising a centrifugal pump stage with an impeller and a diffuser moves production fluid comprising a high viscosity fluid portion and a gas portion to the separation device. The separation device produces a fluid motion that separates the gas phase from the liquid phase in response to the flow rate of production fluid from the fluid mover. A portion of the high viscosity fluid passes through the gas phase discharge port in response to the over-supply of high viscosity fluid to the liquid discharge port in response to the flow rate of the production fluid through the fluid mover.

Abstract: Some embodiments of the disclosure provide an air intake bypass recirculation structure with adjustable air entraining amount and controllable broadband noise which includes main body of the air intake bypass recirculation structure and an air entraining amount adjusting structure. In some examples, an air intake bypass recirculation cavity is formed in the main body of the air intake bypass recirculation structure. An air inlet of an air intake pipe and an air outlet of the air intake pipe are formed in two ends of the main body of the air intake bypass recirculation structure respectively. An airflow inlet of the air intake bypass recirculation structure and an airflow outlet of the air intake bypass recirculation structure are formed in the inner side of the main body of the air intake bypass recirculation structure. The air entraining amount adjusting structure is arranged in the air intake bypass recirculation cavity.

Abstract: A control system for operating a heater includes a controller configured to determine an operational power level based on a measured performance characteristic of the heater, a power set-point, and a power control algorithm, determine a bake-out power level based on a measured leakage current at the heater, a leakage current threshold, and a moisture control algorithm, and select a power level to be applied to the heater. The selected power level is the lower power level from among the operational power level and the bake-out power level.

Abstract: A respiration therapy appliance having a fan for generating a respiratory air flow for carrying out respiration therapy. The fan comprises at least one rotatable fan impeller having a plurality of blade elements which are arranged on a support disk. The blade elements and/or the support disk have at least one cutout.

Abstract: An air pump assembly for an inflatable product may include a housing, a cover coupled to the housing, and a rotatable assembly supported by the housing. The rotatable assembly may include a pump housing having first and second air vents, an impeller positioned within the pump housing, a motor operatively coupled to the impeller, and a rotary disc positioned between the pump housing and a vent hole of the housing. The rotatable assembly may be rotatable to a first position wherein air flows from the first air vent of the pump housing to the second air vent of the pump housing and through the vent hole in the housing into an interior of the inflatable product and a second position wherein air flows from the interior of the inflatable product through the vent hole in the housing into the first air vent and then to the second air vent.

Abstract: A cooling system for an information handling system in a portable chassis comprises a fan housing containing two counterrotating impellers, wherein the axes of rotation of the two impellers are aligned with an axis of orientation relative to a rear surface of the portable chassis. By changing the angle of the axis of orientation, impellers with larger diameters may be positioned in the same fan area for increased volumetric airflow. The shape of the fan housing, the diameter of each impeller and the angle of the axis of orientation may be selected to direct and distribute a greater volumetric airflow for improved cooling of components in the portable chassis.

Abstract: A scroll structure of a centrifugal compressor according to an embodiment is a scroll structure of a centrifugal compressor having a scroll passage formed in spiral shape, comprising: a tongue portion separating the scroll passage from an outlet passage connected to the downstream side of the scroll passage at the most downstream position of the scroll passage in a passage connecting portion where a winding start portion and a winding end portion of the scroll passage intersect; and a ridge portion protruding from an inner peripheral surface of the scroll passage on the axially downstream side of the centrifugal compressor toward the axially upstream side of the centrifugal compressor, with a protruding height toward the axially upstream side gradually increasing toward the tongue portion from a starting position that is located upstream from the tongue portion in the scroll passage.

Abstract: A centrifugal fan and an air conditioning apparatus are provided. The centrifugal fan includes a top plate, a baseplate, a motor, a flow guiding cover, and a plurality of blades. A motor mounting hole is disposed at a central position of the baseplate, and the motor has a motor housing. The motor housing is mounted on the motor mounting hole and is fastened to the baseplate, and the motor at least partially extends between the baseplate and top plate. The blades are fastened between the top plate and the baseplate, and the plurality of blades are disposed around the motor. The flow guiding cover is sheathed on an outer peripheral side of the motor housing, and is detachably mounted on the baseplate.

Abstract: A blower assembly includes a blower shelf having a first support channel. The blower shelf includes a guide bracket coupled to the blower shelf to form a second support channel. A blower housing having a flange is configured to extend into the first support channel and the second support channel. The blower assembly includes a control mounting panel configured to couple to the blower housing and having a tab extending therefrom. The flange of the blower housing is configured to engage with the first support channel and the second support channel during transition of the blower housing along a first direction and into an installed configuration of the blower housing and during transition of the blower housing along a second direction, opposite the first direction, and into an uninstalled configuration of the blower housing. The tab abuts the guide bracket in the installed configuration.

Abstract: A walk-behind floor microscrubber apparatus. The microscrubber includes as main subassemblies an upright handle assembly pivotally connected to a base assembly. The handle assembly includes components for recovering a cleaning solution applied to the floor during cleaning operations. The base assembly houses electrically powered motors for driving scrubbing brushes, and a clean solution reservoir. Spent cleaning solution applied to the floor is sucked to a recovery tank on the handle assembly. The microscrubber has features for avoiding vacuum motor flooding, including a specially-shaped recovery tank. Chambers in the recovery tank capture used cleaning solution when the handle assembly is tilted, thereby reducing the likelihood of solution travelling back to the vacuum motor. The microscrubber also has an exoskeleton reserve tank in the handle assembly.

Abstract: A mattress can include one or more layers of foam material, an adjustable air layer including an air bladder, and a valve. The valve can be fluidically connected to the air bladder and configured to regulate pressure of the air bladder in response to actuation. Some embodiments can include a foam material positioned inside the air bladder.

Abstract: An appliance includes a tub defining a wash chamber, and a centrifugal pump in fluid communication with the wash chamber. The centrifugal pump includes a motor housing, a motor disposed in the motor housing, and a fluid impeller coupled to the motor. A diffuser housing assembly includes a first diffuser housing portion and a second diffuser housing portion. The first diffuser housing portion includes a groove and the second diffuser housing portion includes an extrusion. A diffuser vane is positioned on the motor housing. The diffuser vane engages in the groove of the first diffuser housing portion. The extrusion of the second diffuser housing portion encloses the diffuser vane into the diffuser housing assembly.

Abstract: A fan motor according to an embodiment of the present invention may include: an impeller a hub connected to a rotary shaft and at least one blade formed on the outer surface of the hub; a shroud surrounding the outer circumference of the impeller; and a coating layer coated on the inner circumferential surface of the shroud. The coating layer may include: a polymer having strength lower than the strength of the blade; and a plurality of beads mixed with the polymer and having strength higher than the strength of the polymer.

Abstract: A diffuser pipe has a tubular body defining a pipe center axis extending therethrough. The tubular body includes a first portion extending in a generally radial direction from an inlet of the tubular body, a second portion extending in a generally axial direction and terminating at a pipe outlet, and a bend portion fluidly linking the first portion and the second portion. The tubular body has a length defined between the inlet and the pipe outlet. The tubular body has cross-sectional profiles defined in a plane normal to the pipe center axis. An area of the cross-sectional profile at the pipe outlet is at least 20% greater than an area of the cross-sectional profile at a point upstream from the pipe outlet a distance corresponding to 10% of the length of the tubular body.

Abstract: A blower housing comprises first and second blower housing pieces for surrounding a blower fan. The first blower housing piece comprises a blower discharge section comprising an inner tubular portion, an outer tubular portion, and a drain hole. The inner tubular portion defines a blower discharge passage. The inner and outer tubular portions define an exhaust pipe cavity adapted to receive an end margin of an exhaust pipe. The tubular portions are adapted to enable condensate water that forms on the inner surface of the exhaust pipe to flow into the exhaust pipe cavity. The drain hole extends through the outer tubular portion. The drain hole is configured to enable condensate water flowing into the exhaust pipe cavity to drain from the blower housing. The first blower housing piece is a molded one-piece member.

Abstract: The present invention provides a blower with reduced noise. The blower comprises a blower main body incorporating a centrifugal fan. The blower main body is configured to suck air from both sides of the blower main body by rotation of the centrifugal fan. The centrifugal fan includes a support plate having a rotation center and a plurality of blades provided on each of a first surface and a second surface of the support plate. A position of at least part of the plurality of blades on the first surface and a position of at least part of the plurality of blades on the second surface are misaligned in a circumferential direction, and/or a number of the plurality of blades on the first surface differs from a number of the plurality of blades on the second surface.

Abstract: A centrifugal pump assembly includes a pump housing that encloses a rotor unit that includes an impeller. The pump housing includes an inlet that defines a first passageway that is aligned with the rotor rotational axis, an outlet that defines a second passageway that is aligned with a second axis, and a volute that is provided on an inner surface of the pump housing. An exit opening of the volute faces the outlet and at least a portion of the fluid exiting the volute moves along a volute discharge axis. The volute discharge axis is tangential to a portion of fluid flow exiting the volute at the volute exit opening and is offset relative to the rotational axis. When viewed in a direction perpendicular to the first axis, the second axis is acutely angled relative to the volute discharge axis.

Abstract: An impeller for use in a centrifugal blower, the impeller includes a hub defining an axis of rotation for the impeller; a plurality of inclined blades, the plurality of inclined blades extending away from the hub; and a plurality of reverse inclined blades, the plurality of reverse inclined blades extending away from the hub. Each of the plurality of inclined blades are joined to an adjacent inclined blade at least in part by a reverse inclined blade.

Abstract: The invention relates to a housing (1) for a fluid machine, in particular for a radial fan (2), comprising at least one housing part (3), wherein the housing part (3) has at least one inlet opening (7), wherein the housing part (3) can at least partially delimit a fluid chamber (8) for receiving at least one fan wheel (9), and wherein the inlet opening (7), at least in part, has a curved inlet surface (11).

Abstract: The present invention relates to a pressure wall for a centrifugal pump for fluid having substantially the shape of a disc, the disc-shaped pressure wall having a central axis, the pressure wall comprising: a top surface; and a bottom surface opposing the top surface; wherein the top surface includes an inner surface section and an outer surface section, wherein the inner surface section extends radially from the central axis and is recessed to form a central recess; and wherein the outer surface section includes an inner circumferential edge portion and an outer circumferential edge portion, wherein the inner circumferential edge portion is located closer to the central axis than the outer circumferential edge portion, and wherein the outer circumferential edge portion is located higher than the inner circumferential edge portion with respect to a plane perpendicular to the central axis and passing through the inner circumferential edge portion.

Abstract: An impeller includes a backing plate, a rim disposed so as to face the backing plate, and a plurality of blades arranged in a circumferential direction around a virtual rotation axis of the backing plate. Each of the plurality of blades has an inner circumferential end, an outer circumferential end a sirocco blade portion being forward-swept and including the outer circumferential end and having a blade outlet angle of larger than 90 degrees, and a turbo blade portion being swept-back and including the inner circumferential end, a first region located closer to the backing plate than a middle point in an axial direction of the rotation axis, and a second region located closer to the rim than the first region. Each of the plurality of blades is formed such that a blade length in the first region is longer than a blade length in the second region.

Abstract: A device for conveying a biological material includes a body including an aperture configured to enable connection with an outside of the body and a chamber configured to store a biological material, a plurality of conveyors accommodated in the body and configured to convey the material, and a driver configured to select one of the plurality of conveyors, align the selected conveyor with the aperture, and move the selected conveyor to the outside of the body through the aperture.

Abstract: Integrally geared centrifugal compressor systems are described that include eccentric cartridges that house bearings and seals to maintain rotor concentricity for a variety of pinons integrated in a fixed gearbox design to provide multiple impeller speeds with a single gearbox design. In an aspect, a system includes, but is not limited to, a pinion configured to be rotated by a bull gear about a rotational axis; a rotor coupled to the pinion; and an eccentric cartridge configured to house a bearing assembly through which the rotor extends to support rotation of the rotor, the eccentric cartridge having an outer surface and an inner surface, wherein the inner surface is eccentric relative to the outer surface to align the rotational axis with a center axis of the bearing assembly.

Abstract: A blower assembly including a motor, an impeller and a volute that is configured such that an inlet chamber of the volute and an outlet chamber of the volute are divided from one another by an airtight membrane and the membrane is configured to allow the transmission of pressure waves between the inlet and outlet chambers.

Abstract: Provided is a water pump which may be easily manufactured and a manufacturing method thereof, the water pump including: a motor housing having a concave container shape; a lower casing including a first side wall protruding downward for a lower end of the first side wall to be in contact with an upper end of the motor housing; and an upper casing fitted to the outside of the lower casing, and including a second side wall protruding downward for a lower end of the second side wall to be in contact with the upper end of the motor housing, wherein the upper end of the motor housing, the lower end of the first side wall, and the lower end of the second side wall are simultaneously fusion-coupled with one another.

Abstract: A pump impeller, which can be part of a pump, has an impeller surface and blades being arranged on the impeller surface, wherein at least one of the blades is a blade of the first type which has a blade edge which is inclined toward the front in the rotational direction. The pump impeller can also have blades of a first type and of a second type, the blade geometries thereof differing from one another. A housing element for a pump or of a pump has a housing inner wall defining a flow channel for a fluid medium extending along a central axis. The cross section of the flow channel is greater in a main flow direction and the housing inner wall has a surface structure configured such that it counteracts a return flow counter to the main flow direction along the housing inner wall of the fluid medium.

Abstract: The present disclosure discloses an electric dust blower which includes a shell, a control panel, a battery module, a fan, an illumination lamp, and air outlet nozzles, where the shell includes two half shells capable of being spliced together left and right; the battery module is disposed at a lower portion of a mounting chamber; the fan is disposed at a rear portion of an air chamber and is close to an air inlet; the illumination lamp is mounted in a mounting hole and exposed out of a front end face of a main body; and the air outlet nozzles are detachably mounted at and connected to an air outlet.

Abstract: A centrifugal fan sucks in air from one side in an axial direction and blows out air outward in a radial direction. A blade leading edge is connected to a cylinder inner surface of a side plate. The blade leading edge has: a tip end extended linearly by an apex of a convex surface and connected to the cylinder inner surface; and a convex surface end indicating a boundary between the convex surface and a side surface of the blade. When the cylinder inner surface has: a diameter ?a at a first position, which is an end position of the upstream tubular portion of the side plate on one side in the axial direction, a diameter ?b at a second position where the blade leading edge is connected; and a diameter ?c at a third position where the convex surface end is connected, a relationship of ?a??b??c is satisfied.

Abstract: A magnetic levitation centrifugal pump comprises: an internally hollow body, an inlet connector and an outlet connector for blood. The hollow body comprises a lower element and an upper element which are mutually coupled to each other; a rotor element housed inside the hollow body and provided with a portion made of magnetic material, the rotor element being magnetically commanded in rotation about a relative axis, without contact, by a stator element associable with the hollow body. The upper element has a perimeter flange for coupling and a substantially dome-shaped body projecting from the perimeter flange. The outlet connector is associated with the dome-shaped body and is spaced away from the perimeter flange, between the outlet connector and the perimeter flange being defined an air space inside which mutual tightening device/component can be inserted for the tightening of the upper element with the lower element.

Abstract: A diffuser and deswirl system associated with an engine includes a throat ring defining a plurality of passages spaced apart about a perimeter of the throat ring, a plurality of pockets and a support flange. Each passage of the plurality of passages is to receive a working fluid and each pocket of the plurality of pockets is defined about a portion of a respective passage of the plurality of passages. The diffuser and deswirl system includes a plurality of conduits, with each conduit including a first conduit end and a second conduit end opposite the first conduit end. The first conduit end of each conduit is received within and coupled to the pocket of a respective one of the plurality of passages to receive the working fluid, and each conduit includes a mating feature defined between the first conduit end and the second conduit end coupled to the support flange.

Abstract: A centrifugal fan includes a housing configured to accommodate an impeller. The impeller rotates relative to the housing. A flow channel that cooperates with the impeller is disposed in the housing. The flow channel includes a pressurization area, in which a static pressure and a flow velocity of an air flow are gradually increased along a rotation direction of the impeller. However, an air inlet is disposed on the housing, and there is a specific gap between the impeller and the air inlet. As a result, when air flows through the pressurization area, there is a specific amount of leakage through the gap. Therefore, an air baffle ring is disposed in the centrifugal fan provided in this application.

Abstract: A fan adapted for being disposed in an electronic device is provided. The fan includes a hub and a plurality of metal blades respectively extending from the hub. Each of the metal blades has a root portion connected to the hub and an end portion away from the hub, and a mass of the end portion is greater than a mass of the root portion, such that the metal blade is elongated while the fan is rotated.

Abstract: The present invention provides an air purifier including a plurality of bi-directional fans, which are arranged to be misaligned in a vertical direction such that the discharge directions of discharge ports are different from each other.

Abstract: A construction machine includes a centrifugal fan, and a bell mouth arranged on the suction side of the centrifugal fan. The centrifugal fan has a rotatable hub, an annular shroud arranged so as to face the hub and having a suction port, and multiple blades provided between the hub and the shroud. An outlet of the bell mouth is arranged on the radially inner side of the suction port of the shroud. Each blade is formed such that: a leading edge has a convex shape protruding toward a suction surface relative to a line segment linking a connection of the leading edge with the hub and a connection of the leading edge with the shroud; and a vertex of the convex shape of the leading edge is positioned on a radially inner side of a wall surface of the outlet of the bell mouth when the suction side of the centrifugal fan is seen in an axis direction.

Abstract: A system includes a divided volute turbocharger having variable turbine geometry. The turbocharger includes a turbine housing, first and second volutes separated by a wall having a first and second tongue, and a turbine housing outlet. The system also includes a turbine wheel disposed in the turbine housing and a vane ring disposed in the turbine housing between the turbine wheel and the volutes. The vane ring includes a plurality of rotatable vanes disposed on a vane ring surface of an annular disk in an asymmetric or asymmetric vane pattern that receives the turbine wheel therewithin and a pair of aerodynamic spacers spaced circumferentially outward of the plurality of vanes with each spacer positioned adjacent to a respective one tongue, with the spacers and vanes directing and controlling the flow of exhaust from the volutes into the turbine wheel with generally equal flow while significantly reducing HCF forcing function.

Abstract: 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.

Abstract: The utility model relates to a household submersible pump, which comprises a pump base, a pump body and a signal light assembly, wherein the pump base is provided with a water outlet, a water inlet and a first filter screen; the pump body has an inner housing having an inner electrical chamber equipped with a circuit board therein and a front mount, and an outer housing having a front guiding seat; the signal light assembly comprises a signal light connected to the circuit board and a light guiding column with a waterproof seal ring embedded therein; the light guiding column is able to be rotated from a first state in which it can be inserted into the front mount through the front guiding seat to a second state in which it is locked in the front mount, and is set to be able to export the light emitted from the signal light to the outside of the outer housing. The utility model not only achieves an outward propagation of light to indicate the status of the pump but also achieves an IPX8 level waterproof.

Abstract: A blower device and a vehicular air-conditioning device including a chamber for air flow so as to cool a motor, whereby water drops are prevented from reaching the motor with higher reliability. Included is a casing having an air intake port, an air discharge port, and a discharge flow path portion communicating between the air intake port and the air discharge port; a scroll fan provided in the casing to take in the air from the air intake port and generate an air flow to the air discharge port through the discharge flow path portion; a motor rotationally driving the scroll fan; and a motor cooling unit cooling the motor. The motor cooling unit includes a chamber for partial air flow from the discharge flow path portion and a cooling duct having an opening portion which opens into the chamber at one end and supplying air to the motor.

Abstract: A bladeless fan with multiple air ducts is disclosed. The bladeless fan has a fan housing, a control system arranged in the fan housing, a blower system connected with the control system, an intermediate air duct communicating with the blower system and a rotation component connected with the control system. The intermediate air duct is provided with a side air duct at its both sides, the rotation component is connected with the side air duct to drive the side air duct to fold and unfold with the intermediate air duct as a center shaft. The side air duct is driven by the rotation component to fold and unfold with the intermediate air duct as a center shaft. The fold and unfold of the side air duct can achieve different effects, satisfy the user's requirement and improve the user experience.

Abstract: A turbine assembly for a turbocharger and method of assembling is disclosed. The turbine assembly may comprise a turbine wheel coupled to a rotatable turbocharger shaft, and a turbine housing that at least partially encloses the turbine wheel. The turbine housing may include an exhaust diffuser configured to direct a flow of exhaust, a support member coupled to the exhaust diffuser by a clamp assembly, the clamp assembly, a diffuser gap and a support gap. The clamp assembly may be disposed on the exhaust diffuser and on the support member. The clamp assembly includes a containment ring and a clamp plate. The containment ring may include a channel. The clamp plate may be disposed in the channel. The diffuser gap may be disposed between the containment ring and the exhaust diffuser. The support gap may be disposed between the containment ring and the support member.

Abstract: An air-sending device includes a housing including an inlet air passage communicating with an air inlet and an outlet air passage communicating with an air outlet, a first partition plate partitioning an interior of the housing into the inlet air passage and the outlet air passage, a bell mouth disposed around an opening defined in the first partition plate, and an impeller disposed over the first partition plate across the bell mouth and having a rotation axis that extends in a direction that intersects the first partition plate. The impeller suctions air into the inlet air passage from the air inlet, and blows out air from the air outlet through the outlet air passage. The inlet air passage guides air from the air inlet to the opening along the first partition plate, and has an air-passage wall.

Abstract: A blower housing comprises first and second blower housing pieces for surrounding a blower fan. The first blower housing piece comprises a blower discharge section comprising an inner tubular portion, an outer tubular portion, and a drain hole. The inner tubular portion defines a blower discharge passage. The inner and outer tubular portions define an exhaust pipe cavity adapted to receive an end margin of an exhaust pipe. The tubular portions are adapted to enable condensate water that forms on the inner surface of the exhaust pipe to flow into the exhaust pipe cavity. The drain hole extends through the outer tubular portion. The drain hole is configured to enable condensate water flowing into the exhaust pipe cavity to drain from the blower housing. The first blower housing piece is a molded one-piece member.

Abstract: The disclosure relates to an asymmetrical double-outlet blower, including an upper case, a lower case and an impeller. The upper case includes an inlet. The lower case and the upper case are assembled to form a housing having an accommodation space, and form a first outlet and a second outlet. The accommodation space is in fluid communication with the first outlet, the second outlet and the inlet. The first outlet and the second outlet are disposed on a lateral periphery of the housing and face two opposite directions, respectively. An opening cross-sectional area of the first outlet is less than an opening cross-sectional area of the second outlet. The impeller is accommodated within the accommodation space of the housing, spatially corresponding to the inlet, and rotated around a rotation axis. An airflow is inhaled through the inlet and transported to the first outlet and the second outlet, respectively.

Abstract: The disclosure relates to a blower housing component with a housing body and a mounting flange extending radially outward from the housing body, at which mounting flange multiple mounting points are arranged for mounting the blower housing component, which mounting points are evenly spaced in the circumferential direction, wherein radial ribs extending radially in a straight line along the mounting flange are formed between the housing body and the mounting points, and wherein the radial ribs are intersected by tangential ribs extending along the mounting flange, which tangential ribs extend tangentially to the housing body between two of the mounting points, respectively, and connect the two mounting points, respectively.

Abstract: A centrifugal air blower comprises a fan (2); and a scroll casing (4). The scroll casing includes: a sidewall (4c) covering the fan (2) from an axial direction of a rotation axis on which the fan (2) rotates, the side wall having a suction opening for sucking air; a discharge opening (41) for discharging an airflow generated by the fan (2); a tongue portion (4b) for guiding the airflow to the discharge opening (41); a peripheral wall (4a) surrounding the fan (2) from a radial direction of the rotation axis; and a bell mouth (3) formed along the suction opening (5) of the sidewall (4c). The bell mouth (3) includes an upstream end (3a) and a downstream end (3b), the upstream end being an end portion on an upstream side in a direction of flow of the air passing through the suction opening (5), the downstream end being an end portion on a downstream side in the direction of flow of the air.

Abstract: An impeller for a centrifugal blower includes at least one blade oriented in a radial direction of the impeller. The blade has an airfoil section with a radially inward end and a radially outward end that are thinner than at least one point between the radially inward end and the radially outward end.

Abstract: An integrated flow source is a limiting factor in numerous microfluidic applications. In addition to precise gradients and controlling molecular transports, a built-in source of stable and accurate flow can enable novel shear stress modulations for long-term cell culturing studies. The Tesla turbine, when used as a pump on the microfluidic regime, produces stable and accurate fluid gradients by utilizing laminar flow between its rotating discs Utilizing a stereolithography based 3D printer, a tesla pump (Ø10 cm) and associated housing capable of driving a microfluidic gradient is provided having a printed rotor surface topology of the pump in order to enhance pumping of biological fluids like blood at elevated viscosities. The surface topology is tuned via 3D pixilation, and this modulation completely recovered the pressure loss between pumping water at 1 cP versus glycerol solution at 3 cP. As a result, increased fluid viscosities, and even Non-Newtonian viscosities, can be used.

Abstract: The invention relates to a fan housing (1), a fan and an operating system having a fan. The fan housing (1) has a volute shape and includes a volute tongue (2) and a cavity (16) between an air inlet and an air outlet, the volute tongue is provided with a protrusion (20) configured to extend in a direction substantially parallel to an axial direction of an impeller mounted in the cavity and has at least one peak (24) in a longitudinal section of the fan housing, and the peak is opposed to an annular projection (32) located at the circumferential outer surface of the impeller. The use of the invention can effectively reduce the noise level during the operation of the fan and improve fan performance, thereby considerably improving users' comfort and satisfaction.

Abstract: An impeller for centrifugal pump comprising: a disc, a succession of vanes which extend from the disc around the rotation axis, a central body, adapted for connection to a rotating shaft, the vanes having a profile with a double curvature: a first curvature with respect to a sectional plane that is parallel to the disc, a second curvature with respect to a sectional plane that is perpendicular to the plane of the disc, each one of the vanes comprising an inside curve and an outside curve with different curvatures: the inside curve having an angle of curvature chosen between zero and one quarter of a round angle, and/or the outside curve has an angle of curvature chosen between zero and one quarter of a round angle.