Abstract: A hand-guided working apparatus has a radial fan. The radial fan includes a fan impeller and an air duct, which has a spiral portion surrounding the fan impeller and has a duct cross section, which increases in the air flow direction. An outlet funnel portion adjoins the spiral portion, widens in a funnel shape in the air flow direction and has a radially inner boundary wall and a radially outer boundary wall. The outlet funnel portion ends in an air outlet opening, the outlet width of which is smaller than an outside diameter of the fan impeller. The radially inner and/or the radially outer boundary wall of the outlet funnel portion has a curvature opposed to that of the spiral portion. An intermediate wall is arranged in the outlet funnel portion, between the radially inner and the radially outer boundary wall.

Abstract: A disclosed submersible pump apparatus includes a three-dimensional frame, a pump housing, a drive shaft, an impeller, and first and second motors. The impeller is mounted on the driveshaft within the pump housing and is driven by one or both of the motors. The first motor is connected to a first end of the drive shaft and the second motor connected a second end of the drive shaft. The first and second motors are hydraulic motors and in a first configuration, the first and second motors are configured to cooperatively rotate the drive shaft with hydraulic fluid supplied to and removed from the first and second motors using a parallel fluidic connection. In a second configuration, only one of the motors has a drive gear and drives the drive shaft while the second motor does not have a drive gear and acts as a frictionless bearing supporting the drive shaft.

Abstract: A pump includes a pump casing that defines a pump chamber, the pump casing having an inlet and an outlet. An impeller is arranged with respect to the pump chamber to displace fluid from the inlet into the pump chamber. A vortex shaping mechanism is arranged in the pump chamber and is configured to constrain fluid within the pump chamber into a rotational flow pattern about a rotational axis. At least the casing and the vortex shaping mechanism are configured so that a portion of the fluid is encouraged to establish a solid body vortex, with an outer periphery of the solid body vortex being determined by the vortex shaping mechanism, and a portion of the fluid defining a diffusion zone in fluid communication with the outlet such that fluid cant diffuse across a fluid interface between the solid body vortex and the diffusion zone to generate a pumping pressure at the outlet.

Abstract: A self-priming dedicated water feature pump is provided. The water feature pump can include a strainer housing connected to a pump housing. The strainer housing can include a reservoir for allowing water to enter the strainer housing so that the pump can self-prime. The strainer housing can also include a post installed within the reservoir. The post can function to prevent a strainer basket from being installed in the strainer housing. The post can be of sufficient volume and/or geometry to allow enough water to enter the strainer housing so that the water feature pump can self-prime while also preventing a strainer basket from being installed in the strainer housing.

Abstract: A dental preparation instrument having a pneumatic turbine (1) with a rotor (5) for driving a tool (1.1), wherein the rotor (5), which is mounted in a turbine chamber (18) for rotation about an axis of rotation (4), is impinged by compressed air from a compressed-air nozzle (22). A first radial partition (23) has an opening (17) via which an annular space (8) is in flow connection with an outlet duct (19).

Abstract: A pump with high performance and cleanability includes a casing having a smaller volute and a larger volute; a space between an outer circumference of an impeller and a starting end of the smaller volute being greater than that of the larger volute, generating a circulating flow of self-priming water from the smaller volute to the larger volute; and a diffusing part of the larger volute being formed into an upright, cylindrical self-priming water separating chamber guiding the self-priming water from the smaller volute to flow in for air-water separation. An inner circumference part of the casing is formed concentric with the outer circumference of the impeller with a predetermined space therebetween; defining members are protrusively disposed on the inner circumference part of the casing so as to define the shapes of the two volutes; and the self-priming water separating chamber is made attachable to and detachable from the casing.

Abstract: A fuel system incorporating a boost pump unit, a boost pump unit and method of pumping fuel are provided. The fuel system and boost pump unit are preferably self-priming and do not utilize an airframe mounted pump for supplying fuel for an aircraft combustor. The boost pump unit includes a liquid ring pump and an air/fuel separator. The air/fuel separator has an inlet and first and second outlet ports. The inlet is operably fluidly coupled to an outlet of the liquid ring pump. The air/fuel separator has an arcuate flow path. The first outlet port is in fluid communication with a radially outer portion of the arcuate flow path and the second outlet port is in fluid communication with a radially inner portion of the arcuate flow path. A return line connected to the first outlet port is configured to return fuel to the liquid ring pump.

Abstract: Disclosed is a vacuum self-priming pump in which a main pumping chamber and a sub-pumping chamber divided from each other by a diaphragm are provided within a case, main impellers and a sub-impeller rotated by a motor are respectively installed within the main pump chamber and the sub-pumping chamber such that a space is formed between a pair of left and right main impellers, and connection pipes are respectively formed between suction pipes of the main pumping chamber and the sub-pumping chamber and between discharge pipes of the main pumping chamber and the sub-pumping chamber, so as to more rapidly suck fluid every pumping operation and to effectively pump the fluid without clogging even if the pumped fluid contains various sludge or solid matter.

Abstract: A pump with high performance and cleanability includes a casing having a smaller volute and a larger volute; a space between an outer circumference of an impeller and a starting end of the smaller volute being greater than that of the larger volute, generating a circulating flow of self-priming water from the smaller volute to the larger volute; and a diffusing part of the larger volute being formed into an upright, cylindrical self-priming water separating chamber guiding the self-priming water from the smaller volute to flow in for air-water separation. An inner circumference part of the casing is formed concentric with the outer circumference of the impeller with a predetermined space therebetween; defining members are protrusively disposed on the inner circumference part of the casing so as to define the shapes of the two volutes; and the self-priming water separating chamber is made attachable to and detachable from the casing.

Abstract: A cap for cooperating with a flow control element of a valve for a self-priming electric pump, the valve being designed to open and close a recirculation duct for the passage of the recirculating fluid from the impeller assembly to an intake duct, the cap having a tubular body and, coaxially inside the latter, a mushroom-shaped element, which divides, with its head, the cap into a first portion and a second portion to be applied with engagement means at an opening of the recirculation duct outward, respectively in the overhead and underhead installation of the self-priming electric pump, the axial space occupation of the head and of the stem of the mushroom-shaped element that is extended from the head toward the second portion defining two alternative axial positions of interaction with the flow control element of the valve in the overhead and underhead installation.

Abstract: A fluid pump comprising a pump body, a low pressure impeller, a high pressure impeller, impeller seal means separating the inlet side of the low pressure impeller from its pressure side, a pump priming system, and a pump priming conduit provided through the low pressure impeller radially inboard of the impeller seal means. The high pressure impeller is preferably provided within a cavity, defined by an impeller recess and a cover plate. A wear ring is preferably provided between the low pressure impeller and the inboard end of the cover plate. The pump priming conduit preferably comprises: first and second axial bores through the pump body; a radial bore and two axial holes through the cover plate; an axial hole through the rear wear ring; a cavity between the wear ring and the low pressure impeller; and axial holes through the low pressure impeller, connecting the cavity to the suction side of the low pressure impeller.

Abstract: A priming system for preventing air-locking for use on a centrifugal pump having a priming system with a two piece detachable design. This permits the upper portion of the priming system to be removed for routine maintenance. The lower portion of the priming system includes a plurality of primary stationary vanes located longitudinally in the flow path of multi-phase fluids (air and water) which permit the removal of trapped air. Additional removable secondary vanes are located in the flow path after the primary stationary vanes and prior to the intake structure of the centrifugal pump housing. Such multiple vane structure allows the centrifugal pump to pump multi-phase fluids during a wide variety of conditions without air-locking and without requiring any modifications to the centrifugal pump impeller.

Abstract: Disclosed is a vacuum self-priming pump in which a main pumping chamber and a sub-pumping chamber divided from each other by a diaphragm are provided within a case, main impellers and a sub-impeller rotated by a motor are respectively installed within the main pump chamber and the sub-pumping chamber such that a space is formed between a pair of left and right main impellers, and connection pipes are respectively formed between suction pipes of the main pumping chamber and the sub-pumping chamber and between discharge pipes of the main pumping chamber and the sub-pumping chamber, so as to more rapidly suck fluid every pumping operation and to effectively pump the fluid without clogging even if the pumped fluid contains various sludge or solid matter.

Abstract: A self-priming centrifugal pump comprises a centrifugal impeller (19) arranged in a pumping chamber (9) for transferring liquid from an inlet (5) to an outlet (7) of the chamber, a diaphragm (21) arranged downstream of the impeller for providing priming, and a drive means (25) for driving the diaphragm with reciprocating motion during priming. The diaphragm and the drive means are arranged so that a pressure increase downstream of the impeller after priming causes a change in the neutral position of the diaphragm, which then causes disengagement of the drive means. The drive means may comprises a cam and cam follower arrangement or a crank and connecting arm arrangement.

Abstract: A centrifugal pump mounted in an external housing. The pump has a split housing containing an impeller with outwardly extending vanes that is mounted on a drive shaft. The drive shaft at one end is mounted to a sealed bearing within the external housing and at the other end to a drive.

Abstract: A stacked pump arrangement for mixed-media flow includes a first, self-priming, centrifugal pump with a volute having an inlet and an outlet and a second straight centrifugal pump mounted to an upper portion of the first centrifugal pump, the second straight centrifugal pump also having a volute with an inlet and an outlet. A transition chamber is connected, at one end, to the first centrifugal pump volute outlet and is connected, at another end, to the second straight centrifugal pump volute inlet.

Abstract: A stacked pump arrangement for mixed-media flow includes a first, self-priming, centrifugal pump with a volute having an inlet and an outlet and a second straight centrifugal pump mounted to an upper portion of the first centrifugal pump, the second straight centrifugal pump also having a volute with an inlet and an outlet. A transition chamber is connected, at one end, to the first centrifugal pump volute outlet and is connected, at another end, to the second straight centrifugal pump volute inlet.

Abstract: A fuel pump includes an impeller and a casing member. The impeller defines a plurality of vane grooves arranged in a circumferential direction. The casing member receives the impeller, and the casing member defines therein a pump passage configured to have an arcuate shape along the vane grooves. The discharge passage is provided downstream of the pressurizing passage. The discharge passage has a width narrower than a width of the pressurizing passage, and the discharge passage is positioned toward a radially outer wall of the pressurizing passage. The pressurizing passage includes a throttle part that extends from a starting point to an inlet of the discharge passage. The throttle part has a first width at the starting point, which corresponds to the width of the pressurizing passage, and a second width at the inlet, which corresponds to the width of the discharge passage.

Abstract: A self-priming centrifugal pump comprises a centrifugal impeller (19) arranged in a pumping chamber (9) for transferring liquid from an inlet (5) to an outlet (7) of the chamber, a diaphragm (21) arranged downstream of the impeller for providing priming, and a drive means (25) for driving the diaphragm with reciprocating motion during priming. The diaphragm and the drive means are arranged so that a pressure increase downstream of the impeller after priming causes a change in the neutral position of the diaphragm, which then causes disengagement of the drive means. The drive means may comprises a cam and cam follower arrangement or a crank and connecting arm arrangement.

Abstract: A self priming regenerative pump comprising an impeller with a plurality of vanes formed on its periphery, casings 1a and 1b which house said impeller in a rotatable manner and a pressurizing passage consisting of a gap between said casing and the outer periphery of said impeller, further comprising: a small diameter part formed at a position communicating with pressurizing passage of a discharge flow passage, in particular, formed smaller than the diameter of a discharge port; and; a passage for communicating between discharge port side of smaller diameter part of discharge flow passage and pressurizing passage in order to allow the fluid in discharge flow passage to return to pressurizing passage, wherein said position communicating with pressurizing passage is outwardly offset from the center of the width of impeller.

Abstract: A centrifugal pump with facilitated self-priming, which comprises a casing with a suction inlet and a discharge outlet and with an internal series of diffusers and impellers, which form a cylindrical assembly that forms, together with the casing, an annular interspace which is connected to the inside of the series of diffusers and impellers on the discharge side through corresponding openings and on the inlet side through a hole arranged perimetrically in the intake region; the hole is controlled, on the side of the interspace, by a normally-open flexible metallic laminar valve. A wall of the pump struck by the fluid exiting from the interspace through the controlled hole is shaped so as to have a double symmetrical channel for imparting to the fluid a double vortex before passing through the first impeller.

Abstract: A synchronous hydraulic pump for dishwashers and washing machines comprising a synchronous motor (1), an impeller (2) coaxial to said synchronous motor (1) and a hydraulic body (3), said impeller (2) being housed in said hydraulic body (3) and the hydraulic body (3) having an inlet pipe (4) and an outlet pipe (5). The pump also comprises at least one piece (8) adjacent to the impeller (2), said piece (8) having a projection (9) pointing at the outlet pipe (5), in such a way that said projection (9) acts as a guider directing the flow circulating inside the hydraulic body (3) towards the outlet pipe (5).

Abstract: The present invention relates to a self-priming pump capable of preventing a swirl flow from developing during the self-priming operation and assuring the smooth flow of a stream of water during the pumping operation.

Abstract: A centrifugal pump is provided for use with fluids, gases and solids in connection with a drive shaft and a motor. The pump has a split housing and a split impeller mounted on the shaft within the housing. The housing has opposing inlet means on each side of the impeller and a discharge outlet. The impeller can be mounted on a split adapter which comes in various sizes on which the impeller can be mounted for use on various sized shafts.

Abstract: An air bleed tube is attached to a single-stage centrifugal pump, which has an impeller and a liquid suction tube whose inlet is at a center of the impeller. The air bleed tube is attached with its air inlet at an exposed eye of the impeller to bleed air from the pump and thereby reduce the likelihood that the pump will lose its prime. A light-touch check valve at an air outlet of the air bleed tube allows air at the impeller eye to be discharged from the pump and at the same time prevents air from being sucked by venturi vacuum pressure in the pump back into the air bleed tube and the pump.