Abstract: A blower assembly for a gas-burning appliance includes a blower and a motor coupled to the blower and configured to turn the blower to provide airflow through the gas-burning appliance. The blower assembly also includes a housing enclosing the blower and the motor. The housing includes a first portion and a second portion coupled to the first portion. The first portion and the second portion define a cavity therebetween to receive the motor and the blower. The blower assembly further includes an inlet sleeve coupled between the first portion and the second portion. The inlet sleeve is configured to couple to the gas-burning appliance and receive the airflow from the gas-burning appliance. The blower assembly also includes a seal extending at least partially around the inlet sleeve and at least partially between the inlet sleeve and at least one of the first portion and the second portion.

Abstract: A chopper pump including a drive section having a drive shaft, and a housing coupled to the drive section and having an inlet, an outlet, and an internal cavity arranged between the inlet and the outlet. The chopper pump further includes an impeller received within the internal cavity and coupled to the drive shaft for rotation therewith. The impeller includes a recess formed therein. The chopper pump further includes a cutting insert received within the recess of the impeller. The cutting insert includes a cutting groove axially recessed into the cutting insert. The chopper pump further includes a cutting plate coupled to the housing within the internal cavity. The cutting plate includes a cutting extension that extends radially inward. Rotation of the impeller rotates the cutting blade past the cutting extension.

Abstract: A turbocharger includes a turbine wheel rotatable about an axis and a turbine housing disposed about the turbine wheel. The turbine housing has an inlet portion defining a turbine housing inlet and has a volute portion defining a turbine housing interior. The volute portion has a first volute wall, a second volute wall spaced from the first volute wall, and a tongue separating the turbine housing inlet and the turbine housing interior. The tongue has a first tongue portion extending from the first volute wall substantially toward the second volute wall along the axis, a second tongue portion extending from the first tongue portion substantially circumferentially about the axis, and a third tongue portion extending from the second tongue portion substantially toward the second volute wall along the axis to reduce high cycle fatigue of the turbine wheel.

Abstract: An air blower including a convex part protruding away from the rotation axis of an impeller. When arbitrary cross-sectional surfaces are provided by cutting the convex part in a parallel direction with the rotation axis, each point of the inner circumferential surface of the convex part, which has a maximum distance from the rotation axis, leans toward a first plate of the first and second plates, at which inlets are formed.

Abstract: The present invention relates to a volute pump and particularly provides a volute pump for delivering a liquid containing fibrous substances and solid substances, while preventing these substances from obstructing the pump. The volute pump includes a pump casing (10) having a protrusion (14) projecting into a flow passage (11) and separating a starting end of a volute from a terminal end of a volute. The protrusion (14) faces a liquid outlet (23) of an impeller (20). A radius of curvature (Rb) of a cross section of a distal edge of the protrusion (14) at its one side end (14b) is larger than a radius of curvature (Ra) of the cross section of the distal edge of the protrusion (14) at other side end (14a). The other side end (14a) faces a main plate (20a), while the one side end (14b) is located opposite to the main plate (20a).

Abstract: A turbine housing of a turbocharger is formed by joining a scroll body with a base body. An exhaust passageway is formed between the scroll body and the base body. At the joint portion between the scroll body and the base body, an inside corner portion is formed by an inner peripheral surface of the scroll body that faces the exhaust passageway, and an outer peripheral surface of the base body that also faces the exhaust passageway. An inside fillet that is shaped to change the direction of exhaust gas along the inner peripheral surface of the scroll body to a direction along the outer peripheral surface of the base body is formed on the inside corner portion.

Abstract: A turbocharger for an internal combustion engine includes a shaft, a first turbine wheel, a compressor wheel, and a second turbine wheel. The shaft includes a first end and a second end and is supported for rotation about an axis. The first turbine wheel is mounted on the shaft proximate to the first end and configured to be rotated about the axis by post-combustion gasses emitted by the engine. The compressor wheel is mounted on the shaft between the first and second ends and configured to pressurize an airflow being received from the ambient for delivery to the engine. The second turbine wheel is mounted on the shaft proximate to the second end and configured to be rotated about the axis by a pressurized fluid. An internal combustion engine employing such a turbocharger is also disclosed.

Abstract: A casing of a centrifugal fan includes a suction port forming wall portion, an opposed wall portion opposed to the suction port forming wall portion, and a sidewall portion connecting the suction port forming wall portion and the opposed wall portion. A tongue portion is provided at the sidewall portion. The tongue portion projects into an air passage in the vicinity of a discharge port to form a narrowed air passage portion within the air passage. A leading end surface of the tongue portion is shaped such that the width of the leading end surface increases from the suction port forming wall portion, where the suction port is formed, to the opposed wall portion. The tongue portion is shaped such that the projecting length of the tongue portion into the air passage continuously decreases from the suction port forming wall portion to the opposed wall portion.

Abstract: A floor standing pedestal fan for creating an air current includes a base housing an impeller and a motor for rotating the impeller to create an air flow, an air outlet, and a telescopic duct for conveying the air flow to the air outlet.

Abstract: In a blower fan according to a preferred embodiment of the present invention, a side wall portion includes a tongue portion arranged to project between an air outlet and an impeller. A side surface of the tongue portion includes a tongue portion tip arranged to touch a first imaginary plane including a central axis; a first tongue portion side surface arranged to extend from the tongue portion tip along an outer envelope of the impeller; and a second tongue portion side surface arranged to extend from the tongue portion tip toward a side edge, the side edge being a line of intersection of the air outlet and the side wall portion. The second tongue portion side surface is arranged to cross a second imaginary plane including the central axis and touching the side edge.

Abstract: In accordance with one embodiment, a system includes a turbine engine including an axial-radial diffuser section disposed about a first longitudinal axis downstream in an exhaust flow path from a turbine section. The system also includes an exhaust plenum including a first plenum portion disposed about the axial-radial diffuser section, wherein the first plenum portion includes a curved wall portion that diverges away from a circumference of the axial-radial diffuser section. The exhaust plenum also includes a second plenum portion extending away from the first plenum portion downstream along a second longitudinal axis of the exhaust plenum approximately crosswise to the first longitudinal axis.

Abstract: A blower having a divergence guide portion to reduce flow loss and discharge noise and an air conditioner having the same are provided. The blower includes a scroll casing, suction holes provided at opposite positions of the scroll casing, a discharge hole provided at a top position of the scroll casing, a centrifugal fan received in the scroll casing, and a divergence guide portion gently diverging air to the discharge hole after passing through the centrifugal fan to diffuse the air to both sides of the discharge hole.

Abstract: According to one embodiment, an inlet system comprises first and second incoming fluid ducts configured to be disposed outside of a vessel and to receive a first incoming fluid stream in a first direction through the first incoming fluid duct and a second fluid stream through the second incoming fluid duct in a second direction substantially parallel to the first direction. An internal fluid duct is configured to be disposed inside the vessel and to discharge internal fluid from the first and second incoming fluid streams in a third direction within the vessel substantially parallel to the first and second directions. The inlet system also comprises first and second fluid channels coupling the first and second incoming fluid ducts outside the vessel to the first internal fluid duct such that the first and second incoming fluid streams are communicated to the first internal fluid duct.

Abstract: A nozzle box 10 includes: a lead-in pipe 20; a bent pipe 30 connected to the lead-in pipe 20 and formed so as to change a direction of a channel center line 50 to an axial direction of a turbine rotor 212; and an annular pipe 40 connected to the bent pipe 30 and leading steam to a first-stage nozzle 213a while spreading the steam in a circumferential direction of the turbine rotor 212. In the steam channel lead-in part structure 10, from an inlet of the lead-in pipe 20 toward an outlet of the annular pipe 40, steam channel widths Sa-1 to Sn-1 in a first direction intersecting with the channel center line 50 gradually increases and steam channel widths Sa-2 to Sn-2 in a second direction intersecting with the channel center line 50 and perpendicular to the first direction gradually decreases.

Abstract: A centrifugal blower unit comprising an impeller disposed therein and a scroll casing covering the exterior, the scroll casing having an outlet port, a tongue-like portion, a scroll portion of a volute shape and side casing plates provided with inlet ports on both sides, featuring advantages of increasing a static pressure and reducing an input power and noise while also achieving compactness in size. The scroll portion is provided with tapered scroll walls formed in anti-tongue-side wall adjacent to the outlet port by having it bent along bent lines toward the impeller and at angles to a driving shaft of the impeller such that a cross sectional area of the scroll portion in a direction of the driving shaft becomes gradually smaller toward the side casing plates.

Abstract: Methods, apparatus, and products are disclosed for improving the airflow exiting a blower that has one or more adjustable guide vanes that are affixed to the blower at one or more pivot points located in an outlet of the blower that include: determining a rotational speed of an impeller in the blower and adjusting a position of at least one of the adjustable guide vanes in dependence upon the rotational speed of the impeller.

Abstract: A diffuser for a mixed flow or centrifugal compressor of a gas turbine. The diffuser includes at least one vane presenting a pressure side, a suction side, and a first flank. The vane includes a plurality of orifices opening out into the suction side and/or the pressure side and communicating with at least one cavity formed in the vane, the cavity extending transversely relative to the vane and opening out into its first flank. The cross section of the cavity varies in the transverse direction of the vane, the cross section increasing towards the first flank.

Abstract: Methods, apparatus, and products are disclosed for improving the airflow exiting a blower that has one or more adjustable guide vanes that are affixed to the blower at one or more pivot points located in an outlet of the blower that include: determining a rotational speed of an impeller in the blower and adjusting a position of at least one of the adjustable guide vanes in dependence upon the rotational speed of the impeller.

Abstract: A radial compressor, in particular for a turbo-charger, has a spiral housing and a diffuser. The diffuser is constructed such that a low-pressure region in the area of the transition between the spiral housing and the tongue is at least reduced.

Abstract: An exemplary centrifugal fan includes a casing defining an air outlet, and an impeller in the casing. An air channel is defined in the casing between a sidewall of the casing and outermost free ends of the impeller. The sidewall includes a first curved section adjoining a second curved section. The first curved section is located at a more upstream portion of the sidewall than the second curved section along a rotation direction of the impeller. The first curved section extends along a part of an Archimedes spiral or a part of a logarithmic spiral. The second curved section is located farther away from the impeller than an imaginary extension line of the first curved section along the Archimedes spiral or the logarithmic spiral. An air guide plate is formed in the casing and extends from the air outlet to an inner region of the air channel.

Abstract: A blower fan unit includes a housing, an impeller, an outlet, and a positioning mechanism. The impeller is mounted in the housing. The impeller rotates around a rotation center axis and generates an air current in a centrifugal direction from the rotation center axis. An outlet is formed in the housing and located in a centrifugal direction from the rotation center axis. A positioning mechanism is connected to the housing and makes the position of the housing change along the rotation center axis at each angular position around the rotation center axis.

Abstract: A floor standing pedestal fan for creating an air current includes a base housing an impeller and a motor for rotating the impeller to create an air flow, an air outlet, and a telescopic duct for conveying the air flow to the air outlet.

Abstract: Provided are a low-noise, high-performance multiblade centrifugal fan that suppresses interference between rotational flows generated within extension sections that are extended in a rotation-axis direction at upper and lower end surfaces of a scroll casing, and an air conditioner equipped with the same. In a multiblade centrifugal fan having an impeller disposed in a rotatable manner about a rotation shaft within a scroll casing having a flow path whose cross section gradually increases in a rotational direction, at least one of upper and lower end surfaces of the scroll casing serves as an inclined end surface that is extended in the extending direction of the rotation shaft such that an extended height thereof gradually increases in the rotational direction from a scroll start position, and a stepped section extending in the rotational direction is provided between the inclined end surface and an inner-peripheral side surface of an extension section.

Abstract: A flow outlet for a pump includes a pocket section which defines a pocket section diameter. A throat section downstream of the pocket section, the throat section defines a throat section diameter less than the pocket section diameter.

Abstract: A compressor scroll is provided for redirecting an airflow from a compressor. The compressor scroll includes a spiral-shaped body; a radial inlet formed in the body for receiving the airflow from the compressor as inlet airflow; and an outlet formed in the body such that inlet airflow flows through the body and exits the outlet as outlet airflow, with at least a portion of the outlet airflow crossing at least a portion of the inlet airflow.

Abstract: In the neighborhood area X of the tongue part 27 forming the winding end part of the scroll part 3, the wall part members 31 are provided on both the sides of the welding part (the facing part) ‘a’ of the first scroll part 5 and the second scroll part 7, wherein: the wall part members 31 encloses the welding part (the facing part) ‘a’ and forms the gas-tight space 33; and, the outer circumference wall which enclose the facing part and forms a gas-tight space configure a double-wall structure.

Abstract: A blower fan includes a motor unit including a rotary unit; a plurality of blades fixed to an outer surface of the rotary unit and arranged to be rotated about a center axis by the motor unit; and a lower plate portion defined by a magnetic body and positioned below the motor unit and the blades. The lower plate portion includes a motor fixing portion, a curved portion, a peripheral portion, and a plurality of ribs arranged to interconnect the motor fixing portion and the peripheral portion either directly or through the curved portion, the curved portion including a standing portion extending upward from the outer edge portion of the motor fixing portion and an upper surface portion extending radially outward from an upper end of the standing portion, a plurality of openings positioned below the blades being defined by the curved portion, the peripheral portion, and the ribs.

Abstract: A turbine reduces variations in mass flow at throats even when the flow rate of fluid is low or high. The turbine includes a turbine rotor having turbine blades; a turbine housing accommodating the turbine rotor 80 and whose cross-sectional area of a scroll portion formed between the turbine housing and the turbine rotor gradually decreases; a plurality of fixed vanes fixed along a curved line dividing the scroll portion into an inner scroll part and an outer scroll part; throats formed between the adjacent fixed vanes and communicate between the inner scroll part and the outer scroll part; and a switch valve which switches a flow path in the turbine housing either to the inner scroll part or to both the inner scroll part and the outer scroll part, in which flow path areas of the throats are reduced in a downstream direction of the scroll portion.

Abstract: A centrifugal compressor in which frequency of noise produced by rotation of the impeller does not resonate with natural frequency of vibration of gas in a plurality of axial slots serving to increase gas flow rate in an operation range of increased gas flow rate and broaden stable operation range in an operation range of decreased gas flow rate is provided. The axial slots are formed between the peripheral part of the inlet passage of the compressor housing by the peripheral surface of the inlet passage and an annular ring part of the housing supported by a plurality of struts extending from the peripheral surface, four or more struts are provided to support the annular ring part, and all but one are located at positions determined when all the struts are located at circumferentially equal spacing and the one strut is shifted from the positions by a certain angle.

Abstract: A fan for a gas burner system where at the outflow side of the fan a combustion gas is fed in, in order to form a flammable mixture of gas and air, the fan comprising a spiral-shaped fan housing having a rotational axis and an air outlet; the air outlet of the fan housing widening like a snail shell towards the outflow side of the fan; an impeller that is arranged concentric to the rotational axis in the interior of the fan housing; and an electric motor for driving the impeller, which is integrated at the center of the impeller.

Abstract: A centrifugal-type blower includes a shaft, a fan, and a casing. The casing includes an inlet, an air passage, and a side wall part. A first distance from a center of the fan to the wall part at an inlet side end portion in a radial direction of the fan gradually increases from a volute start part to a volute end part. A second distance from the center to the wall part at any position thereof from an intermediate position to a counter-inlet side end portion in the radial direction is larger than the first distance within a first range. The second distance gradually decreases from the volute start part to a predetermined position. The second distance has the same length as the first distance within a second range.

Abstract: An exemplary centrifugal fan includes a casing defining an air outlet, and an impeller in the casing. An air channel is defined in the casing between a sidewall of the casing and outermost free ends of the impeller. The sidewall includes a first curved section adjoining a second curved section. The first curved section is located at a more upstream portion of the sidewall than the second curved section along a rotation direction of the impeller. The first curved section extends along a part of an Archimedes spiral or a part of a logarithmic spiral. The second curved section is located farther away from the impeller than an imaginary extension line of the first curved section along the Archimedes spiral or the logarithmic spiral. An air guide plate is formed in the casing and extends from the air outlet to an inner region of the air channel.

Abstract: A frame for a centrifugal fan. The frame includes an air inlet and an air outlet. A first barricade is formed on one side of the air inlet and extends outwardly, preventing impurities from entering the air inlet. A second barricade is formed on part of the periphery of the air outlet and extends outwardly and axially, contacting a guide plate of a system and reducing reflow of air.

Abstract: A blower includes a housing and an impeller. The housing has a main inlet and at least one secondary inlet. The impeller is disposed in the housing and has a hub, a plurality of blades and at least one annular plate. Those blades are disposed around the hub. The annular plate is connected to those blades and partially blocked the secondary inlet.

Abstract: A centrifugal multi-blade impeller (10) that has a plurality of blades (11) around a central axis of rotation (10a) and that radially outwardly blows air taken in along the central axis of rotation is housed in a spiral scroll casing (20). The ratio of H/D of height H of the centrifugal multi-blade impeller in a direction of the central axis of rotation to diameter D of the centrifugal multi-blade impeller is 0.2 or less. The scroll casing has a logarithmic spiral spread angle ? of 2.0 degrees or more. It is thereby possible to provide a small and low profile centrifugal air blower that has high air blowing performance and is low noise.

Abstract: In a turbine housing, for an exhaust gas turbocharger of an internal combustion engine with an exhaust gas guide section which has at least one spiral channel that can be coupled to an exhaust path of an exhaust tract and a reception chamber for accommodating a turbine wheel arranged downstream of the at least one spiral channel, at least one first and one second partial housing are provided, which include complementary wall regions of the at least one spiral channel and which are joined so as to form the at least one spiral channel. Also, an exhaust gas turbocharger with such a turbine housing is provided and a method for producing such a turbine housing.

Abstract: Turbulence of fluid in a turbine impeller outlet is reduced with a simple structure so as to improve efficiency of a turbine. In a turbocharger comprising a turbine housing 1 having a scroll passage 8 outwardly of an exhaust nozzle 9 which in turn is arranged outwardly of a turbine impeller 4 rotatably supported on a bearing housing 3, the exhaust nozzle 9 having a plurality of nozzle vanes 15 between front and rear exhaust introduction walls on sides of the bearing and turbine housings 3 and 1, respectively, a vane shaft for each of the nozzle vanes 15 extending at least through the front exhaust introduction wall 10 and being rotatably supported, pressing means 23 is arranged between the respective vane shafts 16 and the bearing housing 3 to urge the vane shafts 16 toward the rear wall 11 to displace the nozzle vanes 15 toward the rear wall 11.

Abstract: A turbocharger includes an exhaust nozzle arranged between a scroll passage of a turbine housing and a turbine impeller, a gap formed between a rear surface of the exhaust nozzle and the turbine housing, and a sealing device for closing the gap. The sealing device includes a seal member which is C-shaped, i.e., an annulus with a part cut out to provide a slit, and has an inner peripheral end arranged along the turbine housing. The seal member is configured such that, by action of gas pressure in the scroll passage, the outer peripheral end approaches the rear surface of the exhaust nozzle, slit ends approach to each other, and the inner peripheral end approaches the turbine housing, leading to reduction in diameter. With a simple structure, gas is prevented from leaking from higher to lower pressure sides through a gap between a turbine housing and an exhaust nozzle.

Abstract: The present invention provides a filtration device combined with self-priming pump in which a filter replacement work is easy and safe, and removal of air inside of a pump and priming are not necessary.

Abstract: A turbomachine front portion includes an internal support shroud for the fan outlet guide vanes, and a flow splitter fairing from which a primary duct and a secondary duct originate. The front portion includes at least one deflector system configured to prevent/limit the ingress of hailstones inside the primary duct, the system including at least one deflecting surface together with an actuator for moving the surface from a retracted position to a deployed position for deflecting the hailstones, the system being mounted on the shroud such that, in the deployed position, a downstream end of the surface is situated upstream of the splitter fairing.

Abstract: A blower assembly 10? includes a housing 18? having an inlet 19 and an outlet 20. The housing includes an inlet ring 22? at the inlet. A blower wheel 12? is mounted for rotation in the housing. An electric motor 16 includes a shaft 14 having an axis B. The shaft is coupled to the blower wheel so that rotation of the shaft causes rotation of the blower wheel that causes air to flow from the inlet to the outlet. The inlet ring has an annular extension 24 extending linearly in the same direction as the shaft axis B. An end 26 of the blower wheel 12? is within bounds of the extension 24.

Abstract: A fluid flow guide element (1) constructed, for example, as a diffuser having an inlet opening (2) and an outlet opening (3) whose respective cross-sectional areas differ from one another. Corresponding to the exterior view shown in FIG. 1, the inside wall surface (4) of the fluid flow guide element (1) is provided with spirally arranged recesses (5) and elevations (6) having an inclination (7) relative to a longitudinal axis (8) of the guide element (1). The recesses (5) and/or elevations (6) have a width that increases or decreases steadily between the inlet opening (2) and the outlet opening (3). This facilitates efficient operation of a fluid flow guide element (1) which simultaneously has both a large opening angle and a reduced design length by achieving a more uniform flow or flow profile due to the spiral arrangement of the recesses (5) and elevations (6).

Abstract: A turbine nozzle (2) that, among components constructing a turbine, reaches particularly high temperature is efficiently cooled with a relatively simple structure. A double casing structure in which a turbine casing (7) is provided outside a turbine shell (5) is formed. The turbine casing (7) functions as a flow path (24) for compressed air (20?21) before combustion. The turbine shell (5) covers a turbine nozzle (2) and a radial turbine impeller (3) and forms flow paths (15, 16) for combustion gas (10?11?12?13). The compressed air (21) before combustion flowing in the flow path (24), for compressed air, having air-tightness between itself and the outside air is blown to the turbine nozzle (2) through a through-hole (51) penetrating both wall surfaces of the turbine shell (5). By this, the turbine nozzle (2) is cooled and the compressed air used to cool the turbine nozzle is made to flow toward the turbine impeller (3).

Abstract: A blower for a water heater having a flue defining a flue axis. The blower includes a housing at least partially defining a first chamber and a second chamber and having an inlet opening into the first chamber and an outlet communicating between the second chamber and atmosphere, the inlet being alignable with the flue, a ramp extending through the second chamber and having a surface, the surface being oriented at an acute angle with respect to the flue axis, and an impeller positioned in the second chamber and being operable to draw exhaust from the flue into the first chamber through the inlet and being operable to direct the exhaust through the second chamber and across the surface of the ramp, the surface of the ramp directing the exhaust through the outlet in a direction substantially parallel to the flue axis.

Abstract: A blower comprises a housing and an impeller. The housing comprises a side outlet and an inlet comprising a predetermined profile, and the impeller is disposed in the housing. The predetermined profile is quadratrical, elliptical, polygonal, non-coaxial circle, or irregularly closed shaped. A flow tunnel is disposed between the impeller and the housing.

Abstract: A draft inducer blower for high efficiency furnaces, including a blower housing which facilitates maximum air flow efficiency through the blower housing while having an overall radial dimension which conforms to the industry standard arrangement of mounting holes on the walls of the furnaces. The blower housing generally includes a housing body and housing cover, the housing body including a plurality of mounting lugs spaced around the housing body through which bolts may be inserted to secure the blower housing to the mounting holes in the wall of a furnace. The housing cover and housing body each define portions of a volute which extends around the outer periphery of the blower housing from the cutoff region to the exhaust transition of the blower housing. The volute includes a cross-sectional area which substantially continuously increases in the axial direction of the blower housing from the cutoff region to the exhaust transition.

Abstract: It is possible to keep a diameter of an impeller and a cross sectional area of an air channel as large as possible while reducing a size of a centrifugal fan in a direction perpendicular to an axis. Thereby, it is possible to acquire characteristics of a high air volume and a high static pressure without lowering the efficiency. In the centrifugal fan, when the radial gap of the cross section in an air channel 10b is gradually enlarged from a clapper portion 10c toward an outlet 10d except for a specific region 10h, the cross inner sectional area of an air channel 10b is gradually enlarged from the clapper portion 10c toward the outlet 10d.

Abstract: An apparatus and a method for a versatile, multi-stage, centrifugal fluids-processing device adaptable to efficiently mixing, blending, emulsifying, deagglomerating or homogenizing fluids. The device comprises a centrifugal-pump-type mechanism comprising an electric motor, an intake screen, an elongate metal body, a central drive shaft extending from the motor to the discharge end of the device. Attached internally to the drive shaft is one impellor per stage, which by rotation of the motor, imparts kinetic energy to the fluid being processed. The fluid discharged from the impellors passes through separate conduits and opposing nozzles into opposite ends of a chamber having the internal shape of an oblate-spheroid with internally-ribbed ceramic walls.

Abstract: A draft inducer blower for high efficiency furnaces, including a blower housing which facilitates maximum air flow efficiency through the blower housing while reducing air flow noises. The blower housing generally includes a housing body and housing cover which define an exhaust transition therebetween, which transitions the air flow from the circular main cavity of the blower housing to the blower housing outlet. The housing body and housing cover are attached to one another via a lobed joint along the exhaust transition, and each include complementary, smoothly contoured inner surfaces to facilitate smooth air flow through the exhaust transition toward the outlet. Additionally, the housing body and housing cover include cooperating cutoff surfaces which form a broadly radiused cutoff within the blower housing to reduce or eliminate the blade pass noise associated with contact of the air flow from the impeller with the cutoff.

Abstract: A cooling apparatus with a mesh structure for cooling a lampwick of a projector. The cooling apparatus includes a blower, an adjustable air duct disposed at an outlet of the blower. The adjustable air duct further includes an air duct portion, a guiding portion, and a mesh structure. The blower blows cooling air to the air duct that is directly formed on the blower or installed on the blower with a separate air duct. The guiding portion is configured at an outlet of the air duct. The mesh structure couples to the guiding portion to move a lower portion of the guiding portion by gravity so that most part of the cooling air is blown to the lampwick through an upper portion of the guiding portion.