Abstract: A method of manufacturing a material for a rotary machine component, by performing at least a solution treatment on a material made of a duplex stainless steel, wherein, in the solution treatment, the material is heated to a temperature in a range of 950 to 1100° C. and is thereafter cooled to 700° C. at an average cooling rate of equal to or greater than 20° C./min.

Abstract: An exemplary centrifugal blower is adapted for dissipating heat generated by an electronic component mounted on a printed circuit board. The centrifugal blower includes a housing defining a receiving space therein, and an impeller rotatably received in the housing. The impeller includes a hub, a supporting member fixed on the hub, and a plurality of blades extending outwardly from the supporting member. The blades are made of metal.

Abstract: An improved automotive pump assembly includes a volute pumping chamber configured to operably contain a rotatable impeller which, when driven, draws fluid into a fluid inlet and pumps the fluid to and through a fluid outlet. The volute chamber has an exterior sidewall with a constant internal first radius over a first sidewall portion and transitions to a second sidewall portion of increasing radius. The chamber's second sidewall portion defines a first end at a sidewall transition point tangent to the constant radius sidewall segment to define a second end which is tangent to the volute chamber's fluid outlet with a second radius that is greater than the first radius.

Abstract: There is provided a centrifugal fan including an upper casing which has an air suction opening, a lower casing, and an impeller which is disposed between the upper casing and the lower casing. The impeller includes an upper shroud which is provided on an upper casing side, and a plurality of blades which are arranged along a circumference direction below the upper shroud, and is rotatable around a rotary shaft. The upper casing and the lower casing configure an open-type casing. A surface of the upper shroud facing the upper casing includes a first portion which becomes closer to the lower casing as separating further from the rotary shaft. A surface of the upper casing facing the upper shroud includes a second portion which faces the first portion of the upper shroud and becomes closer to the lower casing as separating further from the rotary shaft.

Abstract: A method and apparatus to improve air flow in an air circulating fan assembly by forming an inlet opening in a fan assembly. A static air pressure profile is calculated along a top portion of the fan assembly configured to operate in an enclosure. The shape of a section of the inlet opening in the top portion of the fan assembly is changed based on a pressure contour of the calculated static air pressure profile. The method is repeated iteratively one or more times using an inlet opening changed by a previously calculated static air pressure profile when calculating a subsequent static air pressure profile. The inlet opening is positioned in the top surface of the fan assembly so that the centroid of the inlet opening is laterally offset with respect to the rotational axis of an impeller in the fan assembly.

Abstract: In one exemplary embodiment of the present invention, a compressor housing for a forced induction system of an internal combustion engine is provided. The compressor housing includes a compressor inlet passage in fluid communication with a compressor volute configured to house a compressor wheel, the compressor inlet passage comprising a wall that is shared with the compressor volute. The compressor also includes a compressor outlet in fluid communication with the compressor volute, the compressor outlet being configured to direct a compressed gas to an intake manifold of the internal combustion engine.

Abstract: A fan assembly for generating an air flow within a room includes an impeller and a motor for driving the impeller to draw an air flow into the fan assembly, and a casing having a continuous interior passage with a tangential air inlet through which the air flow enters the interior passage and at least one air outlet for emitting at least a portion of the air flow. The casing defines a bore about which the interior passage extends and through which air from outside the fan assembly is drawn by the air emitted from said at least one air outlet.

Abstract: A fan assembly for generating an air flow within a room includes an impeller and a motor for driving the impeller to draw an air flow into the fan assembly, and a casing having an interior passage with a scroll section having a cross-sectional area that decreases from a scroll inlet section to a scroll outlet section. The scroll inlet section has an inlet port for receiving the air flow and the scroll outlet section has an outlet port for returning a first portion of the air flow to the scroll inlet section. The scroll section includes an air outlet for emitting a second portion of the air flow from the casing. The casing defines a bore through which air from outside the fan assembly is drawn by the air emitted from the air outlet.

Abstract: A fan assembly for generating an air flow within a room includes an annular casing which defines an interior passage. The interior passage includes an air inlet, and houses, downstream from the air inlet, an impeller and a motor for driving the impeller to draw an air flow through the air inlet and into the fan assembly. The interior passage also has an air outlet from which at least a portion of the air flow is emitted from the fan assembly. The annular casing defines a bore about which the interior passage extends and through which a secondary air flow from outside the fan assembly is drawn by the air emitted from the air outlet.

Abstract: A blower arrangement having n fans, where n>1, has a housing arrangement for receiving said fans (24, 26, 28). The housing arrangement features a) a first housing part (22) having flow-through openings (76) that are each associated with one of the fans, and having at least one installation opening (78) through which a fan can be introduced into said first housing part (22) and can be mounted in the region of the associated flow-through opening (76); and b) a second housing part (40) that is connected, on one side, to the first housing part (22) on the side thereof having the at least one installation opening (78), and, on the other side, defines an air exit opening (42).

Abstract: Device for discharging a fluid (5) fed into a reaction chamber (1) containing solid particles fluidized by said fluid, through a rotary chamber (100) provided with a finned wheel (13) having fins (14), which may deliver into said reaction chamber the solid particles that are concentrated along the rotary circular wall (8) of said rotary chamber under the effect of the centrifugal force, and processes for the catalytic polymerization, combustion, gasification, drying, impregnation, coating or other treatments of solid particles in suspension in a fluid or for the cracking, dehydrogenation or other catalytic conversions of a fluid using this device.

Abstract: The invention relates to a blower wheel, especially a plastic blower wheel for a cylindrical rotor radial fan for the heating and air-conditioning systems of a motor vehicle. Said blower wheel comprises a plurality of blades (2), and the flow channel (3) between two blades (2) is embodied in such a way that it is convergent on the inflow side, divergent on the outflow side, and distinctively shaped.

Abstract: The present invention relates to a centripetally acting type of water turbine which uses low-head and low-speed water flow and which comprises a rotational force generating device having an inner and an outer centripetal canister rotatably supported by means of a stand and a securing shaft either vertically or to left and right in a straight line, and having a plurality of blades fixedly joined in a radiating fashion between the inner and outer centripetal canisters, and in which the combined shape of the inner and outer centripetal canisters and neighbouring individual blades is constituted as a lower surface which inclines such that water or steam flows at an incline downwardly and, as it does so, the rotational radius progressively reduces.

Abstract: A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing 10, a suction ring groove 1, a ring guide channel 2 and a back-flow ring groove 3 to form a self-recirculating channel. A position or a width of the suction ring groove 1 is distributed in an arc shape in a circumferential direction, and the arc has a center angle a in a range of 0<?30°.

Abstract: A centrifugal fan has an impeller and a bell mouth. The bell mouth has a plurality of wall parts provided on an outer peripheral surface of the bell mouth. The wall parts are arranged at predetermined intervals on the outer peripheral surface in a circumferential direction of the outer peripheral surface. Each of the wall parts extends along the outer peripheral surface from the front side to the rear side in an axial direction so as to be substantially parallel to the axial direction and to a radial direction of the bell mouth.

Abstract: A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing 10, a suction ring groove 1, a ring guide channel 2 and a back-flow ring groove 3 to form a self-recirculating channel. An axial-direction position Sr from an upstream end face of the suction ring groove to an impeller full blade leading edge 4 or a width br of the suction ring groove 1 is represented as A(?·D??·D)2+A0 and is distributed in a parabolic shape in a circumferential direction. An initial phase angle ?0 is in a range of 0??0?2?. A circumferential angle ? of the casing has a definition range of ?0????0+2?. In the expression, A denotes a parameter of the parabola in the axial-direction position Sr or the width br, and A0 denotes an extreme of the axial-direction position Sr or the width br when corresponding circumferential angle ? and the ? are equal at an extreme point of distribution of the parabola.

Abstract: A compressor for a turbocharger is supplied with crank case ventilation (CCV) gases from the engine which is turbocharged. The CCV gases are piped into an inlet of the compressor housing which supports an insert with an MWE structure. The MWE structure comprises an outer wall and an inner wall with a gas flow passage defined between them. At high r.p.m. of the compressor impeller air flows through the passage to provide more air volume to the impeller and at low r.p.m. excess air is bled out of the passage for recirculation. The CCV gases are directed to a position upstream of an inlet to the gas flow passage where they emerge through an outlet which may be defined in the insert. The CCV gases may be supplied to the outlet via a chamber defined between the insert and the compressor housing. The arrangement provides for improved mixing of CCV gases with the incoming air and does not compromise noise reduction.

Abstract: It is an improved style of fan device without much noise. The characters contain a hollow cover, a centrifugal fan, a switch, connected with the centrifugal fan, and a power supply, connected with centrifugal fan; there are at least one inflow part and one outflow part at least; said inflow and outflow fan is vertically designed; the improved style of fan device is characterized in that there is a fan cover in the inflow part area to open and close.

Abstract: A compressor comprises an impeller wheel mounted within a housing defining an inlet and an outlet. The wheel has a plurality of vanes and is rotatable about an axis. The housing has an inner wall defining a surface located in close proximity to radially outer edges of the impeller vanes which sweep across said surface as the impeller wheel rotates about its axis. The inlet comprises a tubular wall extending away from the impeller wheel in an upstream direction. An enclosed chamber is defined between said inner wall and an outer wall and in communication with at least one opening in said in said inner wall. The outer wall is penetrated by at least one ventilation aperture that is designed to be connected via a conduit to a location upstream of the inlet and downstream of an air filter.

Abstract: A turbocharger housing is divided along the longitudinal direction into at least two housing halves. The turbocharger housing includes a sealing device between the two housing halves for sealingly connecting the two housing halves.

Abstract: The invention relates to a compressor assembly (1) and to a method for producing a compressor assembly (1), in particular for a turbocharger, wherein the compressor assembly (1) comprises a compressor housing (2) having a first inlet opening (6) for the inflow to a characteristic map-stabilizing gap (10), said opening having a first cross-section (7), and a second inlet opening (8) for the inflow to a channel (12) provided for forming a primary flow, said second opening having a second cross-section (9). The first (6) and the second (8) inlet openings are arranged radially adjacent to one another with respect to an inflow direction (5). The compressor assembly (1) comprises a tube section (3) arranged on the compressor housing (2) for the inflow to the first (6) and the second (8) inlet openings.

Abstract: The sealing of a turbine casing is reinforced by decoupling a fastening flange from a remainder of a housing. The casing includes a body that is externally reinforced by axial ribs that are connected to an annular rib and the fastening flange is attached to the annular rib by an annular wall portion that is thinner than the annular rib and than the flange.

Abstract: A ventilation fan arranged to reduce vibrations includes an impeller rotating around a center axis, a motor portion arranged to rotate the impeller, a motor supporting portion arranged to support the motor portion, and a housing arranged to accommodate the impeller and the motor portion. The motor supporting portion includes a substantially disk-shaped base portion, and a substantially cylindrical bearing holding portion axially extending with the center axis as the center. At least the base portion is made from resin. On the surface of the base portion, a plurality of recessed portions which are axially recessed are arranged in the form of a net, a staggered pitch, a grid, or a honeycomb. A flat portion of the base portion excluding the recessed portions does not have a continuous region extending in a straight line radially from the center of the base portion.

Abstract: A cooler and a display device including the cooler. The cooler includes: a housing; an air blowing unit disposed inside the housing and sucking external air and blowing the external air in the housing, wherein the air blowing unit includes a plurality of groups each including two air blowers; a guide vane disposed above the air blowing unit and to guide air flowed out from the air blowing unit to flow in different directions; and a plurality of auxiliary guide vanes disposed between the air blowing unit and the guide vane, and each disposed in each of the groups each including two air blowers, so as to guide air flowing below the air blowing unit to flow toward the guide vane.

Abstract: The invention relates to a blower wheel, especially a plastic blower wheel for a cylindrical rotor radial fan for the heating and air-conditioning systems of a motor vehicle. Said blower wheel comprises a plurality of blades (2), and the flow channel (3) between two blades (2) is embodied in such a way that it is convergent on the inflow side, divergent on the outflow side, and distinctively shaped.

Abstract: The present invention provides a compressor housing capable of reducing the weight of a compressor without leading to an increase in the size and a reduction in the efficiency of the compressor. The compressor housing includes: an inner cylinder made of a plastic material and extending in an axial direction and in a circumferential direction to surround blade tips of the blades; and an outer cylinder made of a plastic material and extending in the axial direction and in the circumferential direction to surround the inner cylinder. The inner cylinder and the outer cylinder are bonded or jointed at the first end, opposite the second end where the volute is formed.

Abstract: A cooling fan includes a sidewall coupled to a base of a housing and defining a compartment. The housing includes an air inlet, an air outlet, and a dust channel. The air inlet, the air outlet, and the dust channel are in communication with the compartment. An impeller is rotatably coupled to a stator coupled to the base. A control element includes a driving circuit electrically connected to the stator and a rotating direction control circuit electrically connected to the driving circuit. The air outlet and the dust channel separate an inner periphery of the sidewall into first and second guiding wall sections. The first guiding wall section has a guiding portion contiguous to the dust channel. A first spacing between the guiding portion and a center of the impeller is not larger than a second spacing between the second guiding wall section and the center of the impeller.

Abstract: A lanced and/or slit seamed housing and method of manufacture having a peripheral rolled and lanced or punched seam between a wrapper and the housing panels. The method of manufacture utilizes similar or dissimilar sheet materials in a variety of material thicknesses and with or without coatings applied prior to formation whereby a housing is formed quickly and safely. The rolling and lancing method manufactures a blower housing with an assured and positive sealed seam between the panels and wrapper of the housing. The lances or slits maintain the integrity of the seam and prevent slippage between the wrapper and panels.

Abstract: A plenum fan comprising a fan wheel disposed within a box-like enclosure includes a secondary inlet cone, a primary inlet cone, and a flexible duct. The two inlet cones convey air to the mouth of the fan wheel. A frame supports the fan wheel and the primary inlet cone such that the frame, the fan wheel and the primary inlet cone comprise a fan assembly. If the fan assembly shifts due to fan thrust or vibration, the fan assembly moves as a unit. The flexible duct connects the primary inlet cone to an inlet of the enclosure while isolating the fan assembly's vibration from the enclosure. The secondary inlet cone extends from the inlet of the enclosure, protrudes into or toward the primary inlet cone and provides a smooth airflow path over the abrupt shape of the flexible duct.

Abstract: A multi-impeller arrangement and to a pump having the impeller arrangement. The impeller arrangement or impeller cluster includes at least two impellers, each impeller having an annular back plate and an annular front plate. The impellers are releasably secured together in an axially in-line series having the front plate of a first impeller at one end and the back plate of a second impeller at the other end. The second impeller includes an axial projection which extends from its back plate, through and beyond its front plate to the first impeller. The first impeller is engaged with the projection of the second impeller such that all impellers are rotatable as an assembly.

Abstract: A transverse fan assembly, including for use with agricultural combine harvesters, which fan assembly includes a supplementary air feed inlet for the infill of air flow voids or deficiencies in the air flow pathway from the air inlet of the transverse fan assembly to the air inlet entryway so as to effect a desired, generally more uniform, output air flow pattern across the entire expanse of the air outlet of the transverse fan assembly, and a method of use thereof.

Abstract: A heat dissipation device includes a centrifugal fan, a fan duct and a fin assembly. The centrifugal fan has an air outlet. The fan duct is fixed to the air outlet. The fan duct includes a plurality of guiding plates spaced from each other. A channel is defined between every two neighboring guiding plates. Each of the guiding plates includes a near end near the air outlet and a far end opposite to the near end away from the air outlet. The widths of the channels at the near ends are larger comparing to the portions of the air outlet when having smaller quantity of airflow, and are smaller comparing to the portions of the air outlet when having large quantity of airflow. Widths of the channels at the far ends are equal to each other. The fin assembly is positioned at the far ends of the guiding plates.

Abstract: An efficient turbine having an impeller mounted to an axle. The impeller has a cylindrical center hub mounted on the axle, and a plurality of blades extend radially from the center hub. The blades are welded to the center hub and end plates at either end of the impeller. Watertight chambers for receiving water are formed by adjacent blades, the center hub, and the end plates. An inlet directs water into the impeller to rotate it. The blades have an arcuate shape with no part of the blade extending below the top of the inlet when the outer edge of the blade is aligned with the top of the inlet so that no counteracting torque works against rotation of the impeller. Compressed air becomes trapped in the chambers, and when the compressed air expels the water from the impeller, it reduces the velocity of the water to near zero with respect to the inlet.

Abstract: A fan module includes a housing and at leas one impeller. The housing includes first and second air channels. The housing further includes an axial air inlet in communication with the first air channel and a radial air inlet in communication with the second air channel. The housing further includes at least one radial air outlet in communication with the first and second air channels. The at least one impeller draws external air into the housing via the axial air inlet or the radial air inlet and expels air out of the housing via the at last one radial air outlet. By such an arrangement, external air can be guided into the fan module via different directions, providing enhanced cooling effect.

Abstract: A fan rotor ring for an air cycle machine includes a ring body that defines a main bore having a main bore diameter and central axis. An annular flange extends axially from the ring body over a length and defines a fan ring bore having a fan ring bore inner diameter. A ratio of the fan ring bore inner diameter to the length of the annular flange is 1.63-1.69.

Abstract: A blower fan includes an impeller centered on a central axis, a motor portion arranged to rotate the impeller about the central axis, and a housing arranged to accommodate the impeller. The housing includes a lower plate portion arranged to cover a lower side of the impeller and a side wall portion arranged to cover a side of the impeller. The lower plate portion is preferably made of, for example, a steel sheet. The side wall portion is preferably made of, for example, a resin. A lower end portion of the side wall portion and an edge portion of the lower plate portion are preferably joined to each other through insert molding. An outer circumferential cut surface of the lower plate portion is arranged in contact with the side wall portion at a joint between the lower end portion of the side wall portion and the edge portion of the lower plate portion.

Abstract: Radial compressor and method for the production of a radial compressor, wherein the radial compressor (1) has a compressor housing (10), a compressor shaft (20) which is rotatably supported in the compressor housing, at least one compressor impeller (14) which is arranged on the compressor shaft in the compressor housing, and an inlet insert (12) which is associated with a first impeller stage of the radial compressor in a fluid path in the compressor housing and which has a determined extension in a radial direction (RR) and in an axial direction (AR) of the radial compressor. The inlet insert defines a fluid inlet passage (13) which is arranged in the fluid path upstream of a first compressor impeller and leads to the latter, and the inlet insert is formed of material having a defined material structure, wherein the fluid inlet passage is formed as a subsequently introduced spatial interruption in a material cohesion of the material structure.

Abstract: A centrifugal pump including a motor connected to a volute housing. The volute housing is configured to receive a pumping mechanism that includes an impeller rotatably connected to the motor. The volute housing may also include a removeable cover that provides access to the interior of the volute housing and to components of the pumping mechanism. In one exemplary embodiment, the removeable cover is connected to the volute housing by fasteners, such as bolts. By removing the cover, the impeller, wear plate, and other components of the pumping mechanism may be disassembled and, if necessary, serviced, without the need to remove the motor from the volute housing. In another exemplary embodiment, a gasket having an integrated flapper valve is secured between the cover and the volute housing. The flapper valve is positioned to align with a fluid inlet formed in the cover and acts as a check valve, substantially preventing fluid within the volute housing from exiting through the inlet.

Abstract: A header body for use in fluid circulation systems such as a hydronic heating system is provided in which the header body is configured to couple fluid flow to individual fluid circuits of the system. In one embodiment, the header body comprises a suction chamber with a fluid passage through which fluid flows as between one or more header bodies coupled together to form a manifold. A valve is disposed in the suction chamber, wherein in one example the valve comprises a valve body that is supported by portions of the suction chamber on opposite sides of the fluid passage. The valve body is configured with an aperture that is aligned with the fluid passage in a first and second operating state, one of which decouples the fluid circuit from the system.

Abstract: Disclosed herein is a centrifugal fan. A driving device is connected to an impeller and drives the impeller to rotate within a case. The flowing channel includes a pressure-enhanced section and an output section. The case includes an air input section, an axial inlet section and a radial air outlet. The bottom base has a center and allows the driving device to be secured thereon. Multiple ribs are interconnected between the bottom base and the case to define air inlets among the ribs, the bottom base and the case. The air inlet within the output section has an outmost edge, which is farther from the center than an outmost edge of the air inlet within the pressure-enhanced section, or the air inlet within the output section has an area, which is larger than that of the air inlet within the pressure-enhanced section.

Abstract: A centrifugal fan includes a housing and an impeller. The housing includes a first surface and a flow channel wall. The first surface has a surrounding section and an air inlet section. The surrounding section encircles the air inlet section. The flow channel wall defines a flow chamber and an air outlet, and at least a sidewall of the flow channel wall has a tongue portion close to the air outlet. The impeller is rotatably connected within the flow chamber. The surrounding section plus the air inlet section is an area on the first surface, on which the impeller is projected, and the surrounding section has a convex structure.

Abstract: An impeller for a turbo-machine and is provided.

Abstract: A fan frame structure includes a plastic casing and a metal fixing frame. The plastic casing and the metal fixing frame are provided for an axial flow fan or a blower fan. The plastic casing includes a bottom having a plurality of first fixing portions. The metal fixing frame includes a base with a shaft tube seat in a center thereof. The base includes a plurality of second portions each engaged with one of the first fixing portions. Since the plastic casing is made of inexpensive plastic material, the manufacturing costs are cut. The metal fixing frame provides sufficient structural strength and desired heat dissipating effect.

Abstract: To provide an air-conditioning apparatus that is provided with an air-sending device that includes: a housing; a fan that is disposed in the housing; a casing that guides an airflow, the casing arranged adjacent to the back side of the fan; and a stabilizer that stabilizes the circular vortex, the stabilizer arranged adjacent to the front side of the fan. When ?=A/D expressed by an air flow inlet port width A and a fan diameter D is 2 or lower, an outer peripheral blade inflow angle ?=?×? radian is in the range of 0.4???0.3. The air-conditioning apparatus provided with an air-sending device is capable of suppressing noise as well as increasing fan performance even when the inlet port is narrow.

Abstract: A radial compressor has a compressor housing, a rotatably supported compressor shaft in the compressor housing, at least one compressor impeller arranged on the compressor shaft, and a fluid discharge element arranged downstream of a last compressor impeller in a fluid path in the compressor housing and which has a predetermined extension in radial direction and in axial direction of the radial compressor, wherein the fluid discharge element has a fluid passage for guiding fluid that is accelerated by the last compressor impeller out of the compressor housing, which fluid passage extends in a circumferential direction by a predetermined angular amount, and wherein the fluid discharge element is formed of material having a defined material structure, and the fluid passage is formed as a subsequently introduced spatial interruption in a material cohesion of the material structure. A method of producing the radial compressor is also disclosed.

Abstract: A pond pump comprising an impeller (2) which rotates about an axis of rotation (X) within a pump housing (1). The pump housing (1) comprises a suction inlet (11) that is coaxial to the impeller (2), a pressure outlet (14) for the water that is to be conducted, the pressure outlet (14) being disposed in a radial to tangential direction relative to the impeller (2), and a counterflow plate (12) between the suction inlet (11) and the pressure outlet (14). The impeller (2) is fitted with a radially disposed disk (22) with vanes (21) that are arranged on one side thereof. The counterflow plate (12) is on the impeller side encompassing the vanes (21) while channels (23) that are formed between the vanes (21) have a cross-section which tapers from the inner radial face to the outer face.

Abstract: A blower for a particulate loader and transfer apparatus, comprising, at least one blade having a proximal and distal end, means for rotating the at least one blade in a direction about an axis of rotation wherein the proximal end of the blade is nearer to the axis of rotation than the distal end of the blade is to the axis of rotation and wherein the blade is angled so that as the blade rotates about the axis, the proximal end of the blade precedes the distal end of the blade.

Abstract: A heat exchanger including an array of tubes and fins is configured to reside in a centrifugal fan enabling the centrifugal fan to operate as a cooling and or heating source.

Abstract: A fan comprises a housing having a compartment formed inside, and at least one lateral air inlet and at least one lateral air outlet both penetrating through the inner and outer surfaces of the housing and communicating with the compartment; and a motor mounted inside the compartment of the housing and having a stator and an impeller, with the impeller rotatably coupled to the stator and further containing a hub and a plurality of blades mounted to a top of the hub, with each blade having a first end and a second end in the radial direction of the impeller opposite to each other, with the first end of each blade facing outward, and with the second ends of the plural blades defining an airflow-area.

Abstract: A centrifugal pump includes an electric motor, an impeller driven by the motor and a pump housing having an impeller chamber, an inlet in communication with the impeller chamber via an opening, and first and second outlets in communication with the impeller chamber. The impeller chamber has an interference structure which forms first and second flow channels in communication with the first and second outlets. The interference structure directs the fluid in the impeller chamber to flow through the first outlet via the first flow channel when the impeller rotates in a first direction or to flow through the second outlet via the second flow channel when the impeller rotates in the opposite direction.