Abstract: 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.

Abstract: In a centrifugal compressor, when the position of the tongue of the scroll section in the circumferential direction of the impeller is defined as 60° and the downstream direction in the rotation direction of the impeller is defined as the positive direction of the position in the circumferential direction, a diffuser section outer diameter distribution indicating a relationship between the position in the circumferential direction and outer diameter R of the diffuser section includes an outer diameter increasing portion where the outer diameter R increases going toward the positive direction, and in the diffuser section outer diameter distribution, the position of a start point of the outer diameter increasing portion is 150° or less, and the position of an end point of the outer diameter increasing portion is 270° or more.

Abstract: A radial turbomachine has a first housing part and a second housing part, which jointly form and delimit a flow channel. The first housing part forms a motor chamber for accommodating a drive motor, and the second housing part forms a gas inlet. Furthermore, a radial impeller is provided, which can be driven about an axis of rotation by the drive motor in order to suction a gas from outside the turbomachine through the gas inlet into the flow channel and to convey said gas out of the flow channel through a gas outlet to the outside. The first housing part or the second housing part forms the gas outlet at a radial distance from the axis of rotation and peripherally delimits the gas outlet.

Abstract: A rotor includes: a hub; and a plurality of blades disposed on the hub. Each of the plurality of blades has a suction surface, a pressure surface, a leading edge, a trailing edge, a tip-side edge, and a hub-side edge. The suction surface has a first curved surface portion curved convexly toward the trailing edge such that the trailing edge is inclined to a pressure surface side in a first region which is a partial region, in a blade height direction of the blade, of a region connected to the trailing edge.

Abstract: A turbomachinery according to an embodiment includes an impeller including at least one blade, and a casing for housing the impeller rotatably. A size of a gap between a tip of the blade and an inner surface of the casing during a stop of the impeller is formed non-uniformly over a circumferential direction of the impeller.

Abstract: A cooling system for optimizing fan air flow performance without compromising acoustic performance is disclosed. At least three fan feature embodiments are disclosed: (1) sloped fan blades, (2) sloped impeller hubs, and (3) inlet flow guidance features. For the first embodiment, fan blades attached to an impeller disc and having leading edges that progressively curve toward a center of the impeller disc. For the second embodiment, the impeller disc is attached to and centered on an impeller hub that has a sloped hub surface that progressively curves toward the fan blades. For the third embodiment, an inlet flow guidance feature is positioned within a region surrounding a fan's inlet promoting smooth passage of air into the fan. In some embodiments, all three fan features are combined.

Abstract: An eddy pump impeller includes a hub and a plurality of blades. The hub has a rear surface, and tapers from the rear surface to a front end. The plurality of blades extend from the hub. Each of the plurality of blades has an outer surface essentially parallel to the rotational axis of the hub, inversely tapering from the hub, such that each of the plurality of blades has a width adjacent the hub that is less than a width adjacent the outer surface, and has a front surface tapering in height, such that the plurality of blades is configured to cause an eddy current and cause a fluid stream to be forced to an outside of the impeller.

Abstract: A centrifugal blower includes a fan including a main plate having a disk-shape, and a plurality of blades, and a scroll casing configured to accommodate the fan. The scroll casing includes a discharge portion and a scroll portion including a side wall, a circumferential wall, and a tongue portion. The circumferential wall includes a curved circumferential wall and a flat circumferential wall. In comparison with a centrifugal blower including a standard circumferential wall having a logarithmic spiral shape in cross-section perpendicular to a rotational shaft of the fan, in the curved circumferential wall, at a first end being a boundary between the circumferential wall and the tongue portion and at a second end being a boundary between the circumferential wall and the discharge portion, a distance L1 between an axis of the rotational shaft and the circumferential wall is equal to a distance L2 between the axis of the rotational shaft and the standard circumferential wall.

Abstract: A compressor includes a rotation shaft that is capable of rotating around a main axis, an impeller provided integrally with the rotation shaft, a casing that covers the impeller from an outer circumferential side and forms a flow path through which a working fluid circulates, a discharge scroll that is provided at an end of the flow path on a downstream side and extends in a spiral shape around the main axis, a discharge nozzle that communicates with the discharge scroll on the downstream side and extends from the discharge scroll in a tangent direction around the main axis, and a pressure loss body that has a plate shape extending in a direction orthogonal to an axis of the discharge nozzle extending in a radial direction orthogonal to the main axis and is capable of blocking a part of a flow path cross-section of the discharge nozzle.

Abstract: Provided is a casing 21 for an exhaust turbocharger turbine 2, configured so as to house a turbine rotor 23 to be driven by exhaust gas and form a spiral scroll 22 serving as a path for supplying the exhaust gas to the turbine rotor 23, wherein the scroll 22 includes a first region 222a extending from a spiral origin position 222s to a predetermined angle ? and a second region 222b extending from the predetermined angle ? to a spiral end position 222e, with the surface area of an interior wall thereof decreasing from the spiral origin position 222s toward the spiral end position 222e, and the interior wall at the first region 222a has a lower surface roughness than that at the second region 222b.

Abstract: A turbocharger includes a turbine housing having a hub-side scroll flow path and a shroud-side scroll flow path, and a turbine wheel having front edges for receiving a working fluid from the hub-side scroll flow path and the shroud-side scroll flow path. Each front edge of the turbine wheel includes a first portion for receiving the working fluid flowing out from the hub-side scroll flow path, and a second portion for receiving the working fluid flowing out from the shroud-side scroll flow path. The first portion is inclined with respect to a virtual plane including a rotational axis in a direction opposite a rotational direction of the turbine wheel. The second portion is inclined with respect to the virtual plane in the rotational direction.

Abstract: A centrifugal compressor is provided with a plurality of diaphragms including a first diaphragm and a second diaphragm which are adjacent to each other in an axial direction, a casing disposed on a radially outer side of the plurality of diaphragms and accommodating an internal component including the plurality of diaphragms, at least one axial spacer disposed between the first diaphragm and the second diaphragm, and a scroll flow passage formed by a scroll inner peripheral wall and a scroll outer peripheral wall. The scroll inner peripheral wall is formed by a surface of the first diaphragm positioned on a radially inner side of an outer peripheral surface of the first diaphragm. At least a part of the scroll outer peripheral wall is formed by an inner peripheral surface of the casing.

Abstract: A vehicle airflow system includes a centrifugal fan and an air diffuser. The centrifugal fan is configured to direct air radially outward from a rotational axis of the fan. The air diffuser has a plurality of air deflectors that are disposed radially about the fan. The air deflectors have curved surfaces. Each curved surface defines an airflow channel that has an inlet extending radially outward from a periphery of the centrifugal fan and an outlet extending axially away from the diffuser relative to the rotational axis of the fan.

Abstract: An inclination angle between a direction perpendicular to a rotational axis and a tangential direction of a radially outer edge of a radially outermost concave arc portion, which is located outermost in the radial direction of an impeller among at least one concave arc portion, has a distribution along the circumferential direction of a scroll passage, and when a circumferential position in the scroll passage from a tongue of a scroll part to an outlet of the scroll passage is represented by a central angle about the rotational axis by using the tongue as a reference, the distribution of the inclination angle has a local minimum value or a minimum value in a range of the central angle of 30° to 210°.

Abstract: Impeller for a radial fan, the impeller comprising a front side, a rear side and a peripheral edge, a hub element, an annular covering disc positioned on the front side, an intake opening formed on the front side, a support disc positioned on the rear side, blades extending substantially radially from the hub element towards the peripheral edge, and outflow openings formed in the region of the peripheral edge. A first outer diameter of a radially outer edge of the annular covering disc is greater than a second outer diameter of a radially outer edge of the support disc. Openings are formed in the annular covering disc, wherein the openings are positioned between the radially outer edge of the annular covering disc having the first outer diameter and a radially inner edge of the annular covering disc having a first inside diameter.

Abstract: A centrifugal compressor includes an impeller and a housing having a scroll passage of spiral shape formed on an outer peripheral side of the impeller. When a circumferential-directional position of the scroll passage is represented by an angular position with respect to a scroll end of the scroll passage, and in a cross-section obtained by cutting the scroll passage along a plane including a rotational axis of the impeller at a circumferential-directional position where the angular position is ?, F(?) is defined as: F(?)=(A/R)/r, where A is a cross-sectional area of the scroll passage, R is a distance from the rotational axis to a scroll center of the cross-section of the scroll passage, and r is a radius of the impeller, 0.35?F(360°)?0.65, and 0.08×F(360°)?F(60°)?0.4×F(360°).

Abstract: Turbine housing assemblies and related turbocharger systems are provided. One exemplary turbine housing assembly includes a core structure having a voided inner region defining an axial outlet and an outer surface defining an inner contour of a volute and an inner sheet metal shell having an inner base portion defining an inlet in fluid communication with the volute and a volute portion defining an outer contour of the volute, wherein at least a portion of the core structure defining the axial outlet extends in an axial direction through an opening in the inner sheet metal shell defined by the volute portion. The turbine housing assembly also includes an outer sheet metal shell surrounding the volute portion and including an outer base portion circumscribing the inner base portion.

Abstract: A fan structure including a fan housing and a fan body is provided. The fan housing includes a base and a cover assembled on the base. The cover includes a main portion, a periphery portion, a plurality of connecting portions and a plurality of flow guiding portions. The connecting portions are connected to the main portion and the periphery portion. The cover has a plurality of air inlet openings among the main portion, the periphery portion and connecting portions, wherein each of the flow guiding portions protrudes from the main portion and is adjacent to an inner side of the corresponding air inlet opening. The fan body is rotatably disposed in the fan housing. An electronic assembly is also provided.

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: An inner guide plate has an inner guide plate surface that guides air. An outer guide plate has an outer guide plate surface that guides the air toward a discharge port of the fan. In each of predetermined cross sections perpendicular to a rotation axis of the fan, a reference line is a line connecting the rotation axis and an outer guide end of the outer guide surface that is a radially inner end. In each of the predetermined cross sections, a guide line is a line connecting the rotation axis and an inner guide end of the inner guide surface that is a radially outer end. In each of the predetermined cross sections, a phase difference angle is an angle between the guide line and the reference line in a rotation direction of the fan. The phase difference angles of the predetermined cross sections are different from each other.

Abstract: This compressor wheel (3) is provided with a disc (22) which is formed in a disc shape and provided to be rotatable around a central axis (C); and a plurality of blades (23) provided on a disc surface (22f) facing a first side in the central axis (C) direction with an interval in a circumferential direction around the central axis (C). A rear surface (22r) of the disc (22) facing a second side in the central axis (C) direction has a convex curved surface (25) which is convex toward the second side in the central axis (C) direction at least part of a center portion of the disc (22).

Abstract: There is disclosed an industrial fan housing assembly, comprising: a plurality of scroll-liner sections configured to be assembled together to form a midsection of the industrial fan housing assembly, each scroll-liner section including a liner; wherein, each scroll-liner section includes side flanges to assemble the section to first and second fan housing scroll sideplates on either side. In an embodiment, at least two of the plurality of scroll-liner sections are identical and interchangeable, thereby allowing the identical and interchangeable sections to be assembled in one of a plurality of positions. Advantageously, the scroll-liner sections may be installed without welding or cutting, and may be individually removed for servicing or replaced when the lining is worn. The cost for operating and servicing and the fan housing assembly is significantly reduced.

Abstract: A discharge for a fluid system has an inlet and an outlet in which a fluid flows from the discharge inlet to the discharge outlet. The discharge inlet has a inlet cross-sectional area. The discharge outlet has a plate. The plate has a plurality of radially extending ribs. The radially extending ribs are equiangularly spaced about a center axis of the plate. The radially extending ribs define a plurality of radially extending slots between the equiangularly spaced apart ribs. The radially extending ribs are dimensioned such that a sum of an area of all of the radially extending slots is greater than the discharge inlet cross-sectional area. When the fluid flows through the plate slots from the discharge outlet, it has a discharge coefficient of greater than 0.4.

Abstract: A spiral housing of a radial fan has a flow cross-sectional area which, starting from a housing tongue, increases in the circumferential direction, around a fan impeller which can be arranged on an axial central axis. The cross-sectional area is determined via a contour of at least one axial side part of the spiral housing. The one axial side part has an axial suction opening with an opening edge section surrounding the suction opening, which is directly adjoined, viewed in the radial direction, by a transition section extending in the circumferential direction. The transition section, in a starting section which extends from the housing tongue in the circumferential direction over a predetermined angle, is spaced apart in the axial direction relative to the opening edge section and has a course which increases the flow cross section in the circumferential direction until axial surfaces of the opening edge section and of the transition section extend in the same plane.

Abstract: The present invention relates to a laundry-care appliance (100) having a washing tub (107) and a deodorizing module (109) for dispensing deodorizing substance into the washing tub (107), wherein the deodorizing module (109) is connected to the washing tub (107) and comprises a radial fan (115) for ventilating the washing tub (107), wherein the radial fan (115) is drivable in a first direction of rotation (121) and in a second direction of rotation (123). The deodorizing module (109) is configured to dispense deodorizing substance into the washing tub (107) in a first period of time, wherein the radial fan (115) is drivable in the first direction of rotation (121) in the first period of time in order to distribute the deodorizing substance in the washing tub (107). The radial fen (115) is drivable in the second direction of rotation (123) in a second period of time following the first period of time, in order to remove the deodorizing substance from the washing tub (107) in the second period of time.

Abstract: A rotor of a vehicle AC generator according to the present invention is the rotor of the vehicle AC generator which includes: magnetic pole cores; a field coil wound around the magnetic pole cores; and cooling fans fixed to the magnetic pole cores. In the rotor of the vehicle AC generator, each cooling fan includes: a base portion fixed to the axial end surfaces of the magnetic pole cores; a plurality of blade portions which are each axially arranged in a standing condition from the base portion; and a base rib which is provided in the base portion at a position apart from each root portion of the plurality of the blade portions and arranged in parallel to the extending direction of the blade portion.

Abstract: A disclosed centrifugal blower comprises: a centrifugal fan; a scroll casing which is configured so as to surround the centrifugal fan, has an air inlet on at least one surface thereof, has an air outlet on one side thereof, and guides, to the air outlet, air discharged from the centrifugal fan; an expansion part which is provided at the air outlet and is configured such that the cross-sectional area of the flow path is expanded in the air discharge direction; and a dividing plate which is provided in the expansion part, is arranged at the outside of the air outlet and is arranged lengthwise along the flow direction of the air discharged from the air outlet.

Abstract: A centrifugal fan includes: an impeller driven by a drive motor to rotate; a scroll casing including an inlet-port face having an opening and a wall portion having positions at which distances from an axis line that is a rotation center of the impeller differ from each other, and changing an air flow in a centrifugal direction generated by rotation of the impeller into an air flow in one direction; an air admitting portion including a bell mouth portion having a large-diameter side end placed on an inlet-air-flow upstream side of the inlet-port face; and a protruding portion extending from the air admitting portion in a direction orthogonal to the axis line, which is the rotation center of the impeller, and in a direction away from the rotation center and surrounding part of the bell mouth portion.

Abstract: Turbine housing assemblies and related turbocharger systems are provided. One exemplary turbine housing assembly includes a core structure having a voided inner region defining an axial outlet and an outer surface defining an inner contour of a volute and an inner sheet metal shell having an inner base portion defining an inlet in fluid communication with the volute and a volute portion defining an outer contour of the volute, wherein at least a portion of the core structure defining the axial outlet extends in an axial direction through an opening in the inner sheet metal shell defined by the volute portion. The turbine housing assembly also includes an outer sheet metal shell surrounding the volute portion and including an outer base portion circumscribing the inner base portion.

Abstract: Disclosed is an impeller for a pump for conveying waste water having a support body which can be rotated about an axis of rotation (A) and on which two blades for conveying are provided, wherein the blades each have an inlet region which extends from an inlet edge up to an apex, wherein the wall thickness increases at its end side remote from the support body in the inlet region from the inlet edge and reaches its maximum value at the apex, wherein the blade converges in the inlet region in an axial direction from the support body to the end side with respect to the wall thickness. A base plate is furthermore proposed for interaction with such an impeller as well as a pump for conveying waste water.

Abstract: Turbine housing assemblies and related turbocharger systems are provided. One exemplary turbine housing assembly includes and inner shell and an outer shell. The inner shell includes an inner base portion defining an inlet and a volute portion defining an outer contour of a volute in fluid communication with the inlet. The outer shell circumscribing the volute portion in a radial plane and includes an outer base portion circumscribing the inner base portion. The inner shell includes a first plurality of sheet metal structures joined to one another in the radial plane, the outer shell includes a second plurality of sheet metal structures, and first portions of the second plurality of sheet metal structures surrounding the volute portion are joined to one another in an axial plane transverse to the radial plane.

Abstract: A blower assembly including a housing, a blower within the housing, and a cut-off that is within the housing downstream of the blower with respect to direction of airflow generated by the blower. Openings are defined by the cut-off. The openings are configured to permit airflow generated by the blower to pass through the openings and to a discharge outlet of the blower assembly. The openings are further configured to reduce blower frequency tone generated as airflow passes across the cut-off.

Abstract: A centrifugal pump including a pump chamber, a wear plate, and a rotatable impeller is disclosed. The wear plate has a suction inlet. The pump chamber includes a high pressure region around the impeller within the pump chamber. The impeller's front face has portion located adjacent the wear plate to form a recirculation zone in fluid communication with the high pressure region. Another portion of the impeller's front face forms a small running clearance between it and a portion of the wear plate. That running clearance is interposed between the recirculation zone and the suction inlet. The wear plate includes plural deflector vanes projecting into the recirculation zone. A portion of the front face of the impeller includes plural pump-out vanes in the recirculation zone. The deflector vanes cooperate with the pump-out vanes to expel abrasive particles and prevent them from collecting and eroding the running clearance.

Abstract: A motor casing is provided with a motor rib which is annularly formed along a circumferential direction of a fan while protruding toward a main shroud, and the motor rib is provided with a notch portion in a portion near a high-pressure region in a scroll chamber. A part of moisture flowing into the scroll chamber infiltrates into an inner peripheral space of the motor rib across the motor rib in a low-pressure region in which a flow velocity of ventilation air is high in the scroll chamber. However, the moisture is pressed to the notch portion by ventilation air infiltrating into the inner peripheral space of the motor rib from the low-pressure region in the scroll chamber, and is then discharged to the scroll chamber from the notch portion.

Abstract: A ventilation bed for a vehicle may include an air conditioning system configured to supply air at a required temperature, a pad divided into a plurality of regions, and an airflow control apparatus configured to deliver the air supplied from the air conditioning system into the pad by controlling an amount and direction of the air, in which the air may be selectively supplied into at least a region of the pad depending on operation of the airflow control apparatus.

Abstract: An assembly can include a turbine wheel; a turbine housing that includes a lower turbine housing surface that extends from an exhaust volute to a cylindrical surface that defines an upper portion of a turbine wheel space; a shroud component that includes a contoured surface disposed between an inner end of an upper shroud component surface and an inner end of a lower shroud component surface where the contoured surface defines a lower portion of a turbine wheel space; and a seal mechanism where the turbine housing and the shroud component form an axial gap between a lower axial position of the cylindrical surface and an upper axial position of the contoured surface where the axial gap is axially positioned between an axial position of an inducer portion of the turbine wheel and an axial position of an exducer portion of the turbine wheel.

Abstract: In some embodiments, a plenum of an apparatus for transferring energy between a rotating element and a fluid may include a through hole disposed through the plenum; a plurality of inlet guide vanes disposed proximate a peripheral edge of the through hole, the plurality of inlet guide vanes comprising a first group of inlet guide vanes having a symmetrical profile, a second group of inlet guide vanes, and a third group of inlet guide vanes, wherein each inlet guide vane of the second group and third group have a cambered profile, and wherein each inlet guide vane of the third group has a different cambered profile from each other inlet guide vane of the third group.

Abstract: A fan frame of a centrifugal fan comprises a housing and an inlet structure. The housing includes an opening. The inlet structure is disposed at the opening and includes a top portion and an edge portion. The top portion is disposed around the opening and includes a plurality of first chamfering angles, at least one of the chamfering angles is different from the others. The edge portion extends from the top portion to the inside of the housing through the opening and includes a plurality of second chamfering angles. A centrifugal fan including the fan frame is also disclosed.

Abstract: Blower includes: scroll casing, centrifugal impeller and a motor. Scroll casing includes: recessed portion formed outside lateral plate concentrically with centrifugal impeller; inner-circumferential flat portion disposed more on an inner circumference than recessed portion; and outer-circumferential flat portion disposed more on an outer circumference than recessed portion. Bottommost surface of recessed portion is disposed on a same plane as lateral plate end surface of lateral plate. Angle ?a made by inner-circumferential flat portion and recessed portion inner surface of recessed portion on an inner circumference is set to a value which falls within a range of 90° or more to 120° or less.

Abstract: A computer room air conditioner (CRAC) unit includes a housing having an inlet configured to receive IT air and an outlet configured to exhaust treated air. The CRAC unit further includes a heat exchanger supported by the housing and disposed between the inlet and the outlet of the housing and at least one fan module supported by the housing. The at least one fan module is configured to draw IT air into the housing through the inlet, direct IT air through the heat exchanger, and exhaust treated air through the outlet. The CRAC unit further includes an airfoil frame secured to the housing at the inlet of the housing.

Abstract: A sirocco fan is provided that may include an impeller, in which a plurality of first blades and a plurality of second blades are formed on a main plate, and a scroll housing that covers the impeller. The scroll housing may include air suction holes formed on both of first and second plates and a rounded portion formed to be convex in an opposite direction of the impeller on a scroll that connects both of the first and second plates. An interval from the main plate to the rounded portion in a direction perpendicular to a rotation central axis of the impeller may be the largest. A rapid change in direction of air flowing to the scroll from the impeller may be minimized, and collision of air with the scroll may be lessened, reducing a flow loss and enhancing efficiency.

Abstract: Provided is an improved architecture for rotary kinetic fluid motors and pumps, in which working fluid gains or loses pressure by flowing through an alternating sequence of radial-flow impellers and radial-flow fluid vortices, the impellers and fluid vortices all rotating around a single axis and in a common direction at staggered speeds, each vortex being the product of rotating fluid that is flowing radially through a bladeless annular volume.

Abstract: A turbine housing assembly includes a plurality of constituent members connected to one another and easily manufactured. The turbine housing assembly includes a scroll part, an annular lid part, an exhaust gas outlet and a connection part connectable to a bearing housing for a turbine shaft. The scroll part and the connection part are each formed of a single piece of sheet metal and each is welded to the annular lid part that is orthogonal to a turbine axial direction so that the scroll part and the connection part are connected to each other via the annular lid part. Such a turbine housing assembly is of reduced weight, is quite easy to manufacture, of reduced cost, and can be made, at least in part, of materials having lower heat capacity as compared to conventional turbine housings made of sheet metal.

Abstract: A motor may include a rotating body having: a shaft pin; a rotator having a hollow hole through which the shaft pin may pass; a magnet coupled to an inner surface of the rotator; and a fan having a fan housing coupled to an outer surface of the rotator, a hollow hole formed in a center portion of the fan housing, and radial wings. The motor may also include a stator having: a stator core having a hollow hole formed in the center through which the shaft pin may pass, at least one metal core formed to rotate the rotating body with the magnet, and at least one boss protruding downward at a lower end; and a base bracket having a hollow hole through which the shaft pin may pass, at least protrusion on an outer side coupled to the at least one boss.

Abstract: An impeller includes a disk-shaped hub and a plurality of vanes provided radially on the surface of the hub. The plurality of vanes are formed in a whirling pattern about the center of rotation of the impeller, and each of the vanes has an outer peripheral surface facing the inner peripheral surface of the volute. A rotational-direction rear end portion of the outer peripheral surface of each of the vanes has a recessed step surface formed thereon. The rotational-direction rear end of the recessed step surface of each of the vanes is formed to define an edge shape with respect to a rotational-direction rear end surface of the vane.

Abstract: A single suction type centrifugal includes: a casing; and an impeller housed in the casing and provided with a plurality of blades fixed to an impeller main plate. The casing includes a suction side plate having a suction port, and a motor fixing side plate. A center portion of the impeller main plate is fixed to the motor, and a main plate opening is formed in the impeller main plate between the blades and a center portion of the impeller main plate. A blade end portion imaginary plane passes end portions of the blades on a motor fixing side plate side and is perpendicular to a rotary shaft of the motor. A constriction portion is formed where a distance between the blade end portion imaginary plane and the motor fixing side plate is narrowed between the main plate opening and the blades.

Abstract: Some embodiments of the invention include a ventilation apparatus including a housing assembly with at least one fluid inlet, and at least one fluid outlet, and an exhaust fan assembly coupled to the housing assembly within an inner region. The exhaust fan assembly can include a scroll positioned within and coupled to the main housing, and a blower wheel positioned within the scroll and mechanically coupled to the motor. The ventilation assembly can include a configurable mounting panel including a main panel and at least one tab, and at least one configurable flange coupled to the main panel and extending outwardly from the main panel. The configurable mounting panel can include at least one bending region with at least one aperture. The ventilation apparatus can also include a muffler including an aperture, an electrical box enclosure including a lid, and a duct connector assembly each coupled with the housing assembly.

Abstract: The invention relates to a centrifugal pump (1) comprising a pump housing (2) which is provided with an axial inlet (6), an outlet (5) and a rotor (7) which is attached in the pump housing (2) such that it can rotate about an axial rotation axis A. The rotor (7) is provided with a central boss (9), a shaft shield (11) fastened to the boss (9), a suction shield (12) attached so as to be axially set apart from the shaft shield (11), which suction shield (12) has an axial supply (14) aligned with the axial inlet (6) of the pump housing (2), and a plurality of rotor blades (15) which are fastened between the shields (11, 12). The radial inner ends (18) of the rotor blades (15) are connected to the suction shield (12) by a substantial perpendicular connection.

Abstract: In a scroll structure of a centrifugal compressor, there are provided a radius increase arc portion E in which a radius from the center of a scroll 12 to a scroll centroid P of the cross section of the scroll 12 is gradually increased in any range in a circumferential direction from the start of winding of the scroll, and a radius decrease arc portion F in which the radius is gradually decreased toward a scroll end point Z.

Abstract: A housing has walls that define a volute passage and a diffuser passage fluidly connected to the volute passage. The volute passage has a first subsection and a second subsection, each having cross-sectional areas defined by tabular data. A centrifugal pump has a rotor and a housing, the housing having walls defining a volute passage and a diffuser passage fluidly connected to the volute passage. The volute passage has a first subsection and a second subsection, each having cross-sectional areas defined by tabular data.