An intake charged pump for pumping liquid and which has an intake duct that extends to the suction area of the pump. The pump has a duct through which a jet stream flows to the suction area. A nozzle arrangement in the intake duct accelerates the liquid which is returned via the jet stream and supports the suction of a suction stream of the liquid from a storage container. A nozzle of the nozzle arrangement leads into the mixing chamber at an acute angle in a such way that the jet stream, leaving the nozzle, creates a common mixing stream with the suction stream from the storage container, and through which partial streams having essentially the same pressure and energy content, can be delivered to the front and back suction pockets of the double chamber pump.

An object of the present invention is to provide a transfer device capable of stably transferring a food material transferred by a pump device in accordance with the physical properties of the food material. A transfer device (3,5), wherein a pump device (17) includes a housing unit (31) in which a pump chamber (36) in which a pair of Roots-type rotors (32A, 32B) are disposed and a downstream channel (37) communicating with the pump chamber are formed, and a pump driving unit (39) that drives the pair of Roots-type rotors to rotate in mutually opposite directions, the housing unit includes a casing (34) that houses the pair of Roots-type rotors, and the pair of Roots-type rotors have lobes (32AP, 32BP) each having a V-shaped profile and being meshable with each other, and are attached to the casing interchangeably left and right.

An engine fuel control system includes a main pump which receives fuel from a low pressure source and delivers the fuel at a first high pressure, and a variable displacement augmenter pump which receives fuel from the low pressure source and delivers the fuel at a second high pressure. The augmenter pump has a servo-controller to vary its pump flow rate. The system includes an augmentation valve which is actuatable by an electrically operated control valve to open a flow path therethrough which diverts fuel delivered by the augmenter pump or to shut the flow path. The system includes a pressure drop control valve which senses a pressure differential between the second high pressure and a reference pressure, and controls the servo-controller to vary the pump flow rate of the augmenter pump. The pressure drop control valve spills some of the fuel delivered by the augmenter pump.

A rotary positive displacement pump for fluids, in particular for the lubrication oil of a motor vehicle engine (60), has a displacement that can be regulated by means of the rotation of a stator ring (12) having an eccentric cavity (13) in which the rotor (15) of the pump (1) rotates. The stator ring (12) is configured as a multistage rotary piston for displacement regulation and is arranged to be directly driven by a fluid under pressure, in particular oil taken from a delivery side (19) of the pump or from a point of the lubrication circuit located downstream the oil filter (62). The invention also concerns a method of regulating the displacement of the pump (1) and a lubrication system for a motor vehicle engine in which the pump (1) is used.

A diaphragm pump with a heat dissipation mechanism includes a seat body, a diaphragm assembly, and a rotor pump assembly. The seat body includes a rotating member therein. The diaphragm assembly includes a piston mechanism and a diaphragm mechanism. The diaphragm assembly and the seat body confine a first pump room in which a medium is received. The rotor pump assembly is disposed between the rotating member and the diaphragm assembly. The rotor pump assembly includes a casing. The casing includes a suction port communicated with the first pump room and a discharge port communicated with the at least one medium outlet. The rotor pump assembly includes an outer rotor rotatably connected with the casing and an inner rotor rotatably connected with the outer rotor. The inner rotor is rotatably connected with the drive shaft. The outer rotor and the inner rotor rotate at different speeds.

A diaphragm pump with a heat dissipation mechanism includes a seat body, a diaphragm assembly, and a rotor pump assembly. The seat body includes a rotating member therein. The diaphragm assembly includes a piston mechanism and a diaphragm mechanism. The diaphragm assembly and the seat body confine a first pump room in which a medium is received. The rotor pump assembly is disposed between the rotating member and the diaphragm assembly. The rotor pump assembly includes a casing. The casing includes a suction port communicated with the first pump room and a discharge port communicated with the at least one medium outlet. The rotor pump assembly includes an outer rotor rotatably connected with the casing and an inner rotor rotatably connected with the outer rotor. The inner rotor is rotatably connected with the drive shaft. The outer rotor and the inner rotor rotate at different speeds.

A diaphragm pump having a crankshaft that is rotatable about a rotational axis and coupled to a piston. The piston is reciprocally displaceable within a piston cylinder along an axis of motion between suction and discharge strokes. A diaphragm housing coupled to the piston cylinder at least partially defines a pumping chamber through which fluid is pumped as the piston reciprocates. The axis of motion, which intersects a connection between the piston and the connecting rod, may not intersect the rotational axis of the crankshaft such that, relative to an arrangement in which the axis of motion does intersect the rotational axis, a peak magnitude of piston side load forces during the discharge stroke is reduced and a peak magnitude of piston side load forces during the suction stroke is increased so as to attain an improved balance between the peak magnitudes of piston side load forces of the discharge and suction strokes.

A diaphragm pump having a crankshaft that is rotatable about a rotational axis and coupled to a piston. The piston is reciprocally displaceable within a piston cylinder along an axis of motion between suction and discharge strokes. A diaphragm housing coupled to the piston cylinder at least partially defines a pumping chamber through which fluid is pumped as the piston reciprocates. The axis of motion, which intersects a connection between the piston and the connecting rod, may not intersect the rotational axis of the crankshaft such that, relative to an arrangement in which the axis of motion does intersect the rotational axis, a peak magnitude of piston side load forces during the discharge stroke is reduced and a peak magnitude of piston side load forces during the suction stroke is increased so as to attain an improved balance between the peak magnitudes of piston side load forces of the discharge and suction strokes.

What is concerned is an eccentric screw pump having at least one stator (1), a rotor (2) rotating in the stator, a drive (3) for the rotor, a pump housing (4) which is connected to the stator (1) and has at least one inlet opening (6) for the medium to be conveyed, a connection housing (14) arranged between the pump housing (4) and drive (3), a connection shaft (9) which is connected to the drive (3) and is arranged at least in certain regions in the connection housing (14), and a coupling rod (10) which is arranged in the pump housing (4) and is connected to the connection shaft (9) via a drive-side joint (11) and to the rotor (2) via a rotor-side joint (12). The drive-side housing connection piece (16) can be demounted in such a way that the drive-side joint (11) can be exposed for maintenance or demounting.

A diaphragm pump having a crankshaft that is rotatable about a rotational axis and coupled to a piston. The piston is reciprocally displaceable within a piston cylinder along an axis of motion between suction and discharge strokes. A diaphragm housing coupled to the piston cylinder at least partially defines a pumping chamber through which fluid is pumped as the piston reciprocates. The axis of motion, which intersects a connection between the piston and the connecting rod, may not intersect the rotational axis of the crankshaft such that, relative to an arrangement in which the axis of motion does intersect the rotational axis, a peak magnitude of piston side load forces during the discharge stroke is reduced and a peak magnitude of piston side load forces during the suction stroke is increased so as to attain an improved balance between the peak magnitudes of piston side load forces of the discharge and suction strokes.