Abstract: The problem of minimizing size and weight parameters in an impeller-type centrifugal pump system (10), including a liquid ring priming pump (32), is solved by providing a housing (12) defining a fluid inlet (26). An impeller (16) is rotatably mounted downstream of the inlet on a rotatable shaft (18). A pressure balance chamber (42) is located behind the impeller to provide for thrust balancing of the impeller. A first passage (44) extends directly through the impeller communicating inlet pressure with the balance chamber. The first passage has an inlet forward of the impeller blades. The liquid ring pump is rotatably mounted on the shaft and is located behind the balance chamber. A second passage (46) communicates the inlet pressure in the balance chamber with the liquid ring pump outside the rotating shaft.

Abstract: A rotary turbine fluid pump employs unique configurations of turbine vane receptacle opening and turbine vanes. The turbine vane receptacle is connected to a circumferentially extending fluid path, in which free ends of turbine vanes are inserted for pressurization of the fluid therein. The turbine vane receptacle operation has pair of surfaces opposing and spaced apart to each other. Each surface is radially tapered toward the center at a first inclination rate. Each turbine vane is provided edges opposing the surfaces of the turbine vane receptacle operation. The edges are correspondingly tapered at a second rate which is determined so that the spacing between the surface and the edge is gradually increased toward the rotation center of the turbine. This construction minimizes friction increasing when the pressure balance in floating seal formed between the surface and the edge is destroyed.

Abstract: An impeller-type blower for use particularly in environments of particle contaminated air includes a housing defining an aft cavity. An impeller, including a shaft, is rotatably mounted in the housing by a bearing forward of the aft cavity. Passages communicate the aft cavity with a region forward of the bearing to provide a pressure balance on opposite sides of the bearing and, thereby, prevent particle contaminants from infiltrating the bearing.

Abstract: A centrifugal pump with hydraulic thrust balance and tandem axial seals. The centrifugal pump has an impeller with front and rear axial seals operating in unison to either reduce or increase the size of gaps therebetween. The gaps are of a minimal dimension to minimize leakage. The rear axial seal is located at the tip of the impeller with the front axial seat located either at the impeller eye or radially outwardly thereof. Hydraulic thrust balance is achieved and continuously maintained by axial movement of the impeller shaft and impeller to modulate the gap at the rear axial seal and, thus, control the value of an effective pressure acting on the back side of the impeller whereby an outward thrust force resulting therefrom counterbalances an inward thrust force resulting from pressure acting on the front shroud of the impeller. A clearance at the rear of the impeller communicates with suction pressure through a restricted passage.

Abstract: An improved open impeller for centrifugal compressors or the like that includes a hub portion and a disc portion having front and rear surfaces. A plurality of circumferentially spaced blades are positioned on the front surface of the impeller disc. A plurality of circumferentially spaced vanes are located on the rear suface of the disc and generally located between adjacent ones of the blades. The vanes are elongated and have their chords disposed at an angle relative to a radius of the circle on which the vanes are disposed to generate a pressure preventing gas exiting the blades from passing behind the rear surface of the impeller. Also, the vanes may be angled relative to the rear surface to produce a thrust counteracting the thrust produced by the impeller blades. The arrangement of the vanes is such that rigidity is provided to the impeller disc reducing the vibration of the disc when rotating at high speeds.

Abstract: A centrifugal pump of the magneto coupling type in which an isolation shell separates the pump side from the driver side includes an auxiliary impeller arranged additionally to the pump impeller proper. This allows a decreasing of the pressure in the spaces at the reverse side of the pump impeller and thus a balancing of the thrust forces. This effect can be controlled by control means located in the casing at the outer end of the feeding channels of the auxiliary impeller. This allows the provision of a pump of a simple design in which e.g. the isolation shell can be made with an extremely small wall thickness and in which an open or closed pump impeller can be supported without any thrust generated difficulties.

Abstract: A dental handpiece which includes a high speed compressed-air driven turbine at the distal end thereof which serves to drive a dental drill, or other element. The handpiece includes an internal conduit for supplying compressed air to the turbine and an exit port for exhausting the compressed air. In accordance with the concepts of the invention, the exit port is coupled to a vacuum pump, or other vacuum source, to enhance the turbine efficiency and to provide for increased power output with significant noise suppression, and also to facilitate the use of in-line oil mist lubrication.

Abstract: A sealing arrangement is herein disclosed for use in a high energy centrifugal pump and the like wherein a chamber is defined about the discharge portion of the pump wheel which is attached to a shaft to form a rotor which rotates with respect to stationary parts and has limited axial movement as determined by the thrust bearing clearance. An annular seal is disposed operatively about the outside diameter of the pump wheel with sufficient clearance for the pump wheel to clear the seal regardless of the extent of the axial movement of the wheel. The seal acts to retard the shock waves of transient pressure differentials developed across the wheel. the seal further operates to define a dashpot arrangement wherein the wheel comprises a piston which automatically equalizes any pressure differential developed across the wheel and by-passing the seal.

Abstract: The present invention relates to a regenerative pump having a casing with a casing inlet and casing outlet, an impeller disposed on a shaft and containing at least one bucket ring with axially and radially open bucket compartments on the first and second side of the impeller, and mutually separated side channels having an entrance port, an exit port and an interrupter. The arrangement herein is such that the conveying streams on the two sides of the impeller are separated from each other. The entrance ports of the side channels on the two impeller sides are in communication with the casing inlet, and the exit ports are in communication with the casing outlet, so that the conveying streams are first subdivided and then recombined.

Abstract: Inside the sealing shroud of the centrifugal pump there is located an inner rotor driven by a drive motor, while an outer rotor which is connected to the pump impeller is located outside of the sealing shroud wall. At least the sealing shroud wall is formed of a material which is electrically non-conductive. The efficiency is improved. Materials not normally used in sealing shrouds, such as ceramics, can be used for the same and this increases the usefulness or fields of application of the pump.

Abstract: In a centrifugal pump containing a sealing shroud the pump impeller is mounted only radially for rotation on a stationary axle or shaft. The stationary axle or shaft is fixed in the suction connection by means of wing rib supports or ribs and possesses an equalizing channel which connects the pump chamber portion at the rear of the pump impeller with the suction connection. This pump chamber portion at the rear of the pump impeller is connected with the delivery or pressure connection, whereas the pump chamber portion at the front side of the pump impeller is also connected with the suction connection as well as with the delivery or pressure connection. Advantageously, throttling rings are provided for self-metering throughflow throttling, depending on the axial position of the pump impeller. Additionally, the throughflow can be regulated by a throttling screw which is provided for the equalizing channel.

Abstract: A combination vacuum pump, low friction bearing and seal assembly is provided in which a rotor relatively rotatable with respect to a stator has two sets of radially spaced, concentric spiral grooves. As the rotor rotates, one set of grooves forces sufficient ambient air between confronting surfaces of the rotor and stator to keep them axially spaced and provide a low friction bearing. Another set of grooves forces sufficient air from the vessel and through a one-way air exit to evacuate the vessel. A restriction created by the axially spaced confronting surfaces substantially prevents ambient air from moving radially inwardly to the evacuated vessel, as well as trapping the ambient air to maintain the axial spacing. Any ambient air passing through the restriction is dumped back to ambient through the same air exit, thereby keeping the evacuated vessel sealed.

Abstract: An electric fuel pump for pumping a liquid fuel from a tank to an engine. The pump device has a regenerative pump section and an electric motor section for driving the regenerative pump section. The regenerative pump section includes a pump casing having a first inner surface and a second inner surface axially opposing to and spaced from each other to define therebetween a pump chamber, a shaft adapted to be rotatingly driven by the electric motor section and an impeller accommodated by the pump chamber and mounted on the shaft for rotation therewith but axially movably relatively thereto. The impeller has one axial end surface opposing to the first inner surface with a first gap formed therebetween, and the other axial end surface opposing to the second inner surface of the pump casing with a second gap formed therebetween.

Abstract: A pump which is especially suited for pumping fuel from a storage tank to an internal combustion engine includes a rotatable impeller wheel having an annulus of impeller vanes defining respective compartments therebetween which open onto one axial surface of the impeller wheel which extends substantially normal to the axis of the rotation of the impeller wheel, and an end wall having an end surface which is juxtaposed with the axial surface of the impeller wheel and defines an interface therewith. The end wall is provided with a pumping channel which extends along a part-annular course along the trajectory of orbiting movement of the impeller vanes and opens onto the interface. The pressure of the fluid being pumped by the impeller vanes increases in the downstream direction of the pumping channel and exerts a tilting moment about an axis normal to the rotation axis on the impeller wheel.

Abstract: An electrically operated fuel pump device comprises a regenerative pump component and an electric motor component operatively connected to the regenerative pump component to actuate the same. The regenerative pump component includes a pump casing having spaced inner surfaces thereof cooperating with each other to define therebetween a pump chamber. An impeller is disposed within the pump chamber rotatably and axially movably. Clearances are defined between axial end faces of the impeller and the inner surfaces of the pump casing, respectively. Liquid fuel increased in pressure to a discharge pressure by the rotation of the impeller is introduced into the clearances to act on the axial end faces of the impeller so as to minimize the direct contact of the axial end faces of the impeller with the respective inner surfaces of the pump casing.

Abstract: Disclosed is a high-pressure centrifugal blower, which comprises an impeller with a back plate and pressure leveling blades secured to the back side of that back plate. The blades extend from the periphery of the impeller over some distance radially inwards. In order to regulate the pressure control clearance between the blades and the back wall of the blower case, control members have been installed between the blades and the back wall of the case.

Abstract: For rotating the runner of a fluid machine in compressed air atmosphere in the runner chamber after shutting off working water and feeding compressed air to the runner chamber to move the liquid level therein downwardly below the runner while discharging water remaining in the outer peripheral portion of the runner through a leak-water exhaust pipe following starting of pump-operation, an inlet valve opening detector is mounted and operatively connected to a leak-water exhaust valve controller for controlling a leak-water exhaust valve. Stable operation of the fluid machine in spinning-in-air mode can be achieved by opening the leak-water exhaust valve by means of the leak-water exhaust valve controller following lapse of a given period of time after the inlet valve is fully closed, to permit the water remaining in the outer peripheral portion of the runner to be discharged through the leak-water exhaust pipe.

Abstract: A multistage hydraulic machine is provided with an outer backchamber, an inner backchamber and a sidechamber around the runners of each stage.A piping having a control valve is provided between the outer back chamber in the highest pressure-stage and the sidechamber in the lowest pressure-stage.Moreover, the outer backchamber is connected to the sidechamber for the runners of the high-pressure-stage.

Abstract: A hydraulic balancing apparatus for a hydraulic machine including means communicating an outer runner crown chamber with a runner band chamber. The communicating means has opposed ends opening in the chambers at the substantially identical radial distance which is determined such that the axial thrust applied to a runner by pressure water in sections of the outer runner crown chamber and of the runner band chamber inside of the opposed ends becomes substantially equal to the axial thrust applied to the runner by pressure water in the remaining sections of the chambers outside of the opposed ends.

Abstract: A foil bearing turbomachine including means to minimize the thrust forces at start up.

Abstract: The invention comprises an improved rotary apparatus comprising an outer body member having an internal generally axially directed first thrust area. An inner body member is mounted within the outer body member for relative rotation of the two body members. The inner body member has a second generally axially directed thrust area generally opposed to the first thrust area. The body members define fluid passageways and the thrust areas define a fluid-receiving space therebetween in communication with the passageways. First and second annular seals of differing diameters seal between the thrust areas, and a thrust control system is provided for selectively varying the fluid pressure in the annular portion of the fluid-receiving space bounded by the two seals by selectively providing pressure equalizing communication between that portion and a plurality of zones of differing pressures external to the annular portion.

Abstract: A hydraulic machine comprising a runner of the Francis type having a crown ring with a plurality of first and second balance holes. The first balance holes are formed in the crown ring for communicating between a runner crown chamber defined between the crown ring and an upper cover disposed in spaced juxtaposed relation with the crown ring and low pressure sections defined by blades interposed between the crown ring and a shround ring. The second balance holes are formed in the crown ring for communicating between the runner crown chamber and the interior of a runner boss whereby the first and second balance hole means have reverse thrust characteristics with respect to each other.

Abstract: An electromagnetically driven pump having a rotor unit comprising a motor armature integral with a pump impeller and supporting bearing means mounting the rotor unit for rotation and limiting axial movement of the rotor unit in one axial direction and additional means for limiting movement of the rotor unit in an opposite axial direction.