Abstract: An air-oil separating arrangement in a gas turbine engine having a sump with a rotatable annular wall structure includes an annular section of the sump wall structure having a plurality of circumferentially spaced air metering orifices defined therein, and an air-oil separator having a circular plate attached to the annular section of the sump wall structure and rotatable therewith. The circular plate has a pair of opposite faces and a plurality of separator fins attached to and extending from one face of the plate. The separator fins are circumferentially spaced from one another and extend radially from the center of the plate and define spaces therebetween which are in flow communication with the orifices through the annular section of the sump wall structure.

Abstract: An impeller for a centrifugal pump has an axis of rotation. The impeller includes a pair of covers which cooperate to define a chamber, and blades in the chamber defining generally radial flow channels. Each of the covers has a wall which is oriented transverse to the axis of rotation. The walls are provided with cutouts at the periphery of the impeller and one cutout is associated with each flow channel. The radial lengths of the cutouts are equal to or less than one-half the lengths of the flow channels. Each flow channel and its respective cutout cooperate to define an aperture which opens to the exterior of the chamber both axially and radially.

Abstract: An impeller in a water pump for circulation of cooling medium in a cooling system of an engine has a shroud with a shroud end to which the edges of the blade inlets are attached and which is formed in the cylindrical configuration substantially parallel to the rotary shaft. Each of the edges of the blade inlets is shaped so that it is continuously smooth from a shroud end surface at the inlet side thereof and extends upstream in the axial direction, while each of the edges of the blade inlets at the side of a casing extends substantially perpendicularly to the rotary shaft. The edge of the blade inlet attached to the cylindrical shroud end and the edge of the blade inlet at the casing side being connected therebetween by a smooth arc-like curve projecting convexly upstream. The inlet angle of the blade is set to substantially 0.degree. at the inlet edge at the shroud end and to an angle calculated substantially on the basis of the conventional design at the inlet edge at the casing side.

Abstract: A small high capacity centrifugal pump for the transfer of liquids is disclosed. The pump has a circular pump chamber, a hole (bored off center relative to the diameter of the pump chamber) for installation of the drive shaft component, the outlet and inlet nozzles of very large internal diameter. The impeller is a foraminous sleeve formed as a one piece casting of a width slightly less than the impeller's diameter. It is threaded at its inboard end for mounting onto the threaded end of the impeller mounting fixture, and are open at its opposite end, except for a narrow circular integral ring which serves as a sealing member between the rotating impeller and the stationary pump chamber wall.

Abstract: The invention relates to a radial-flow wheel for a turbo-engine comprising a hub and blades distributed on the hub-side outer circumference, the meridian section contour of the outer surface of the hub being a catenarian curve. This radial-flow wheel has the advantage of low frictional losses.

Abstract: An apparatus for fluidizing, degassing and pumping a suspension of fibrous cellulose material is described which comprises a housing, a fluidizing rotor and an impeller of radial type, said housing having a cylindrical portion for the rotor, a portion for the impeller which is radially enlarged in relation to the cylindrical portion, a wall closing one end of the housing and a shaft rigidly connected to the impeller, an axial inlet for suspension being disposed at the cylindrical portion, and a radial outlet for suspension at the radially enlarged portion. The apparatus has also a degassing system for removing gas which collects in front of the impeller and comprising an opening in the impeller and the wall, the impeller having a hub, a partition and forward and rear blades. Furthermore, the impeller is provided with a concentric, circular inlet for the continuous supply of suspension to the rear blade space, the rear blades being arranged to exert a pump action on the suspension supplied to the apparatus.

Abstract: A cavitation resistant impeller for liquid-conveying centrifugal pumps has a plurality of impeller vanes, each vane having, in combination, a leading inlet edge with a root portion extending upstream of its tip portion; a vane thickness that is greater upstream of the impeller throat than the vane thickness downstream of the impeller throat; and an elliptical nose on the leading inlet edge. The invention can be used in straight-vaned impellers or in Francis-type impellers.

Abstract: A fluid transfer apparatus has a pump housing, which is provided with a fluid intake opening, freely rotatable impeller with an integral base section and a fluid discharge opening. The impeller has several integral vane portions, which contain fluid channel routes within, extending radially from the base section. The liquid is drawn by the impeller into the pump housing, and enters the base section through fluid suction port of the impeller, and passes through the fluid channels of the vane portions to be discharged through the discharge opening of the pump housing.

Abstract: A medical pump comprises a casing having side walls, a peripheral wall, and a pump chamber defined thereby, an inlet port formed substantially in the central portion of one of the side walls of the casing, an outlet port formed in the peripheral wall of the casing so as to extend tangent thereto, a rocker substantially concentric with the inner peripheral surface of the casing and disposed in the chamber, and a rocker driving unit for rocking the rocker so as to vary the volume of the space between the rocker and the outlet port with the lapse of time, thereby producing a rotating flow in fluid in the casing.

Abstract: An improved centrifugal fan wheel adapted to receive a flow medium for radially accelerated discharge by plurality radially extending impeller blades. A plurality of flow medium passage channels are positioned radially inwardly of an outer extent of the fan wheel to improve the efficiency of the fan. The flow medium passage channels are defined by alternating cutouts disposed between adjacent blades about the outer extent of a fan wheel back plate.

Abstract: A blade (14) for a centrifugal flow fan (11) having forward curved blades. The blade has a boundary layer trip (21) on its pressure surface (14). The trip promotes the transition of the boundary layer from laminar to turbulent flow and enables the layer to remain attached to the pressure surface for a greater distance. The increased amount of attached flow enables greater fan efficiency and reduces fan radiated noise. The boundary layer trip may be of a variety of configurations.

Abstract: An impeller for a molten metal pump having a cup-shaped body comprised of a sidewall and a closed end portion that define a cavity. A plurality of shear vanes extend radially from the outer surface of the impeller, particularly from the end portion of the impeller. The impeller also has a plurality of openings extending laterally through its sidewall, wherein the openings have center lines disposed parallel to lines extending radially from the center of the cavity. The openings may be equidistantly spaced about the periphery of the sidewall. The impeller may also be comprised of a bearing member forming a portion of the sidewall.

Abstract: The present invention is directed to a two chamber dishwasher pump wherein the pumping noise associated with recirculation is substantially lowered by reducing the intake area to the recirculation impeller thereby interrupting air pockets formed in the fluid while recirculating. In addition the noise associated with fluid drainage is minimized by an aperture between the drain chamber inlet and the drain outlet which allows fluid to flow from the inlet to the outlet thereby interrupting air pockets in the drain line which create the noise. In addition, fluid flows through the aperture in an opposite direction to that described above in order to relieve excessive pressure in the drain line during recirculation.

Abstract: The present invention provides an improved rotor and end connector for an induction motor. The end connector adjoins a rotor core. The rotor core includes a plurality of spaced ventilation openings and defines an aperture for capturing a motor shaft. The end connector should preferably surround and be concentric with the inner ventilation openings. To increase ventilation efficiency, the end connector has a plurality of spaced fan blades. Each of the fan blades has a sloping inner surface and backward curving outer surface. The backward curving outer surface is substantially perpendicular to the end connector, and directs air flow radially outward.

Abstract: In a pump impeller structure employing a plurality of vanes arranged on the periphery of an impeller hub in a substantially radial direction of a pump shaft having a driving connection with the impeller, each vane including a particular geometry of a pressure surface therein. The pressure surface is formed concave in such a manner as to increase an angle defined between two tangential lines on a point of the pressure surface, form the innermost end of the vane to the outermost end of the vane, one tangential line being perpendicular to a straight line drawn in the radial direction of the impeller from the center of the pump shaft to the point on the pressure surface and the other tangential line being drawn along the contour of the pressure surface, both of the tangential lines being included in a same rotational plane of the vane.

Abstract: The vanes of a radial turbine have pressure surfaces which are convex when viewed in a plane normal to the axis of rotation of the radial flow rotor and suction surfaces which are concave when viewed in the same plane. The curvature acts to promote favorable radial surface pressure gradients to assist the control of boundary layer migration in the intervane passages and also increase the structural integrity of the vane members. The otherwise flexible extremities of the vane members are stiffened by introducing the curvature, as the natural resonant vibration frequencies of the vanes are changed. The invention is also applicable to the vane members of a radial or mixed flow impeller in gas or other fluid applications.

Abstract: A turbo pump is provided with an impeller having a volute casing for a diffuser type casing. The configuration of a meridian section of the impeller shroud at the side of a boss is made as a concave arch-like surface of revolution. The shroud at the side of the blade inlet is cylindrical and substantially parallel to the shaft about which the impeller turns. Each of the blades of the impeller is so shaped that the edge of the blade inlet projects toward the impeller eye and is smoothly connected to the surface of the shroud. The inlet angle of the blade is as small as possible.

Abstract: A small-sized centrifugal pump is improved in its efficiency and performance by having an impeller the height of which is higher than theoretically calculated value and decreases in the circumferential direction from the central portion, and which has a flow channel with a narrow and constant width.

Abstract: A volute type centrifugal pump has an impeller rotatably mounted in a volute chamber of the pump casing adjacent a cutwater within the casing. The impeller includes a hub having a pair of diametrically extending vanes with the outer end portion of each vane being angled in a trailing direction relative to the direction of rotation of the impeller. A semi-cylindrical projection having an axis parallel to the axis of the hub is formed on a trailing surface of each angled portion adjacent an outermost end thereof thereby reducing cavitation on the trailing surface of the impeller to reduce drag and turbulence while increasing pressure on the trailing surface. The surface of the semi-cylindrical projection is roughened to enhance hydraulic jump.

Abstract: An apparatus for mixing powder and liquid together continuously comprises a housing (1) which has a conical surface (16), and a rotor (7) which is journalled for rotation in the housing and which has a conical surface (9). The housing has provided therein a liquid inlet (20) through which liquid is delivered to a gap between the conical housing and rotor surfaces, and a powder inlet (12) through which powder is delivered to the upper surface (8a) of the rotor. As the rotor rotates, a liquid film is formed on the conical housing surface while, at the same time, powder is thrown onto the liquid film with the aid of rotor-carried guide vanes (10). The mixture is worked and pressed out through an outlet (30) by wing-like elements (11) carried by the rotor.

Abstract: An impeller for a centrifugal pump has a hub which is designed to be affixed to the pump shaft. The hub carries a first cover plate which is located at the pressure side of the impeller and supports a series of vanes defining flow channels. The first cover plate is secured to the bases of the vanes and a second cover plate situated at the suction side of the impeller abuts the tops of the vanes and overlies the flow channels. A suction port constituting an individually manufactured component is disposed at the inlet of the impeller and has a section of constant diameter which faces away from the vanes as well as a section of variable diameter which confronts the vanes. The section of variable diameter is connected to the tops of the vanes by a weld seam. The second cover plate overlies that end portion of the suction port having the greatest diameter and is secured to the tops of the vanes in an area between the suction port and the impeller outlet.

Abstract: Disclosed herein is a windscreen washer pump, which is suitable for use with a vehicle, of a type wherein washer fluid is forcibly pressurized by means of an impeller, to be supplied to a vehicle windscreen or the like. A plurality of supplemental vanes are provided between the impeller and an inlet for entry of the washer fluid. The plurality of supplemental vanes serve to introduce the washer fluid from the inlet into the impeller and forcibly pressurize the fluid from the impeller even in a case where air is mixed.

Abstract: An impeller of a multiblade blower having at least two circular end plates or partition plates spaced apart from each other, and a plurality of blades disposed between the peripheral portions of the partition plates. Each of the blades is formed with a cylindrical portion having a uniform cross-sectional area, at the outer peripheral end thereof on the outer peripheral side of the impeller. The cylindrical portion has a diameter which is larger than the thickness of the blade at the outer peripheral end thereof so that the cylindrical portion is projected from both front and rear surfaces of the blade at the outer peripheral end of the latter.

Abstract: A fan impeller comprises a back plate, a front plate and a plurality of blades lying between the front and back plates, wherein the blades are fitted relative to the axis of rotation of the impeller to provide a leading edge adjacent the back plate, so as to impart, in use, a lateral sideways vector to a stream of and passing along the blades. At least two of the blades may be of increased thickness than the remaining blades. These improvements increase the life of the fan impeller significantly.

Abstract: A vehicular AC generator comprising a magnetic pole core secured to a shaft and excited by an excitation coil, the magnetic pole core having opposite end faces, a stationary core surrounding the magnetic pole core and having mounted thereon a stationary coil, and a front and a rear bracket supporting the stationary core and rotatably supporting the shaft through bearings. The front and rear brackets having ventilation openings defined therein, and a fan mounted to each of the opposite end faces of the magnetic pole core is provided for generating flows of cooling air through the ventilation openings in the front and rear brackets, An inlet opening side end portion of a blade of the fan that overlaps the inlet opening has a radially length dimension which is equal to or less than 50% of radial legnth dimension of the inlet opening side end portion.

Abstract: An improved compact automobile fan unit of the type including a turbofan fixedly mounted on the drive shaft of a motor and having a plurality of backwardly curved blades, and a generally cup-shaped housing having intake openings in its end wall and discharge openings in its side wall and secured to a yoke of the motor for containing therein the turbofan, wherein the backwardly curved blades are circumferentially spaced at different angular intervals and the turbofan has a center of gravity located at an axis of the drive shaft. With the blades thus arranged, the fan unit is capable of operating at high speeds with large capacity without generating unpleasant noise.

Abstract: A drainage pump includes a pump casing having an inlet and an outlet, and an impeller accommodated in the casing and rotated by a driving motor. The impeller has a plate-like vane. A liquid flows from the inlet toward a front end portion of the vane along the axis of the vane, and is discharged from the outlet in a direction substantially perpendicular to the axis of the vane. The front end portion of the vane has a convex shape, and therefore has an inclined portion which extends from a portion located on the axis of the vane to an outer peripheral edge thereof.

Abstract: A rearwardly curved centrifugal blower having an annular envelope around the impeller, so that the rotating impeller draws air in through a central inlet and forces it radially outward into the envelope and out of an annular discharge. Multiple airfoil vanes are positioned in the annular envelope, in two axially displaced stages. The vanes are angled to turn and diffuse airflow entering the envelope.

Abstract: The invention relates to compressor manufacture. The impeller comprises a base disc (1) wherein, according to the invention, the angle (.beta.) between its internal surface (5) and the plane (p) perpendicular to the impeller rotation axis (0--0) is 0.5-1.degree. larger than the angle (.alpha.) between its external surface (4) and the same plane (p).

Abstract: An impeller, comprising a main disc (1), blades (2) and a covering disc (3) which consists of interconnected web (4) and ring (5). The joint of the web (4) and ring (5) is detachable to form mated surface (6 and 7) in the place of the joint and has on the surface (7) of the ring (5) an annular shoulder (8) and on the surface (6) of the web (4) an annular groove (9) accomodating the shoulder (8). The internal diameter Do of the web (4) is less than the diameter (D) of the ring (5) along their mated surfaces (6 and 7) by 1 to 1.5.times.10.sup.-3 Do.

Abstract: The vane of the impeller in a high-speed or mixed-flow centrifugal pump for the conveying of liquids which contain high or low concentrations of strands or strips of vegetable, plastic or other material has a convex inlet edge whose curvature increases gradually in a direction radially outwardly from the axis of rotation at such a rate that the resultant of the centrifugal force and the resistance encountered by a strip or strand at a particular point of the inlet edge is invariably tangential to the respective point of the inlet edge. This ensures that the strips or strands do not overlie and circulate with the inlet edge but are entrained by the resultant force to become separated from the vane. The stagnation paint of the vane in a region which is remote from the axis of rotation is disposed at the suction side of the vane; this also contributes to prevention of accumulation of strips or strands along the inlet edge.

Abstract: A radial impeller for use in centrifugal pumps wherein a reduction of the outer diameter entails a change in the total head but does not affect the capacity because the front coverplate of the impeller is inclined with reference to a plane that is normal to the impeller axis. The inclination of the outer marginal portion of the front coverplate with reference to such plane increases in response to decreasing outer diameter of the impeller. The specific speed of the impeller can be increased from approximately 11 to approximately 35 min.sup.-1 by reducing the outer diameters of the coverplates. The exit angles of the vanes are selected in such a way that they remain constant irrespective of the selected outer diameters of the coverplates within the range which is required to change the specific speed from 11 to 35.

Abstract: An impeller for a centrifugal impeller comprising a disc portion, a coaxial hub portion having a longitudinal through-bore by which the impeller is mounted on a rotatable shaft, and a plurality of blades in any one of several forms. The tip of each blade is curved in a direction opposite to the rotation of the impeller more than the rest of the blade. The radius of the tip curve decreases uniformly toward the radially outer end of the blade. This tip treatment produces improved isentropic efficiency.

Abstract: In a centrifugal fan having radially directed fan blades, each having, in combination, a serrated surface forming in longitudinal cross-section a sawtooth configuration in the radial direction of the rotating blade with a wear resistant coating over a substantial area of the serrated surface.

Abstract: A radial or semiaxial impeller for centrifugal pumps has an annulus of vanes whose inlet edges are disposed at the periphery of a circle and are bounded by convex transition surfaces having small radii of curvature. The inner portions of the suction sides of vanes are bounded by flat or slightly curved surfaces which merge gradually into concave surfaces bounding the outer portions of the respective suction sides. The length of each flat or slightly curved surface is between 3 millimeters and the vane pitch. The ratio of the radii of curvature of transition surfaces at the inlet edges of the vanes to the vane pitch is between 0.0035 and 0.04 and/or the ratio of these radii to the average thickness of the inlet portion of a conventional vane is between 0.04 and 0.50. Such construction of the vanes reduces the likelihood of excessive erosion as a result of cavitation.

Abstract: This disclosure is concerned with reducing blade-generated cavitation and accompanying noise in systems such as marine ducted reversible thrusters and the like, by novel techniques including a skew-forward blade configuration at the outer radii and particular blade thickness/chord length ratios associated therewith.