A rotary device for use with a fluid includes a housing, a rotor, a ring, and at least one vane. The housing includes a tubular surface defining, in part, a tubular volume. The housing is segregated into at least a pumping zone positioned between first and second working zones. The first working zone is configured to receive a fluid and the second working zone is configured to output the fluid. The rotor is mounted for rotation about a rotation axis. The rotor includes a body mounted within the tubular volume. The body includes a plurality of slots. The ring is at least indirectly coupled to the housing by way of a bearing. The at least one vane is associated with one slot of the plurality of slots. The at least one vane is connected at least indirectly to the ring and configured to rotate within the tubular volume.

The electric hydraulic cylinder is provided with: the electric motor; the gear pump configured to be driven by the rotation by the electric motor. The electric motor has the motor housing and the rotating shaft supported by the motor housing so as to be freely rotatable. The gear pump has: the drive gear into which the rotating shaft of the electric motor is inserted; the driven gear meshed with the drive gear; and the pump housing configured to accommodate the drive gear and the driven gear, and the motor housing is attached to the pump housing such that the gap is formed between the motor housing and the pump housing in the radial direction of the rotating shaft.

The invention relates to a rotary piston pump for one-time use made of plastic for screwing onto a fastening nozzle on a tubular bag, having two rotors (10), which are coupled to each other via gear wheels (11) and which can be driven in opposition and which are mounted in a pump housing (5), which has suction nozzles (6) and outlet nozzles (7), wherein each rotor (10) has a rotor shaft (12), the rotor shaft ends (15) thereof being mounted in the walls (8, 4) of the pump housing (5), and the gear wheels are integrally molded to the rotor shafts, and wherein each rotor (10) has two rotor wing walls (13) arranged diametrically on the rotor shaft (12) which flare continuously outward and to each of the peripheral ends of which a partially cylindrical rotor wing shoe (14) is molded, wherein the rotor wing shoes (14) contact the cylindrical inside wall regions of the pump housing (5), on one side, and the rotor wing shafts (13) of the adjacent rotor (10) on the other, in a sliding and sealing matter, wherein seals are integrally molded on the rotor, wherein the seals serve to prevent the effects of air admission onto the content located in the tubular bag to as great an extent as possible.

A vane pump comprises a housing and a control slide. A rotor rotates to draw lubricant into a rotor receiving space of the slide via a housing inlet and discharges the lubricant via an outlet. The control slide moves to change its eccentricity relative to the rotor for increasing and decreasing a pressure differential between the inlet and outlet. The control slide is biased in a displacement increasing direction. The control slide has one or more seals defining a control chamber with housing. The one or more seals includes a seal assembly received in a recess on a control slide outer surface. The seal assembly has a base element in the recess and a bearing element pivotally attached to the base element and bearing against an inner surface of the housing for sealing. The pivotal attachment includes male and female pivotal connectors coupled together.

A serviceable pump includes a motor disposed at an end of the serviceable pump and connected to a gear portion with a pump shaft. The gear portion receives fluid from and outputs fluid to a system such as a deep fryer cooking system. The gear portion includes at least one channel for receiving fluid, such as oil, to lubricate the gears and a fluid discharge aperture to push fluid into a cooling loop at a first end of the cooling loop. The cooling loop cools the fluid passing through the serviceable pump and is disposed between the motor and the gear portion. The cooling loop is connected to a seal assembly that surrounds the pump input shaft at a second end of the loop. The seal assembly allows the cooled fluid to pass along the pump input shaft.

The disclosed technology includes pumps, pipes, valves, seals, and systems for pumping and controlling high temperature fluids, such as liquid tin, at temperatures of between 1000-3000 C. The systems and device may be partially or entirely constructed using brittle materials, such as ceramics, that are capable of withstanding extreme heat without significantly degrading, and may be secured using components made of refractory metals, such as tungsten. The systems and devices may utilize static and dynamic seals made from brittle materials, such as graphite, to enable the high temperature operation of such pumps, pipes, valves, and systems without leakage.

Several examples of a pressure balancing system for a pump. In one example, the pressure balancing system comprises: a housing; a first rotor within the housing having a first axis of rotation, a first shaft, a first face surface; a second rotor having an axis of rotation, a second face surface adjacent the first face surface of the first rotor; the face of the first rotor, the face of the second rotor, and an inner surface of the housing forming at least one working fluid chamber; an annular ring fitted around a shaft, adjacent a first pressure chamber having a fluid connection through the housing; the annular ring configured to bias the first rotor toward the second rotor when fluid is supplied under pressure to the first pressure chamber; a fluid conduit is configured to convey fluid to a pressure chamber between the housing and the annular ring to bias the annular ring against a radial extension of the first shaft thus biasing the first rotor toward the second rotor.

A pump device includes: a drive shaft; a pump element; a pump housing including; a pump element receiving space, first and second bearing receiving spaces, a suction passage, a discharge passage, a return passage, and a seal receiving space, a first bearing including a first lubrication groove, received within the first bearing receiving space, and supporting the drive shaft; a second bearing which includes a second lubrication groove having a sectional area that is perpendicular to the rotation axis, and that is greater than a sectional area of the first bearing that is perpendicular to the rotation axis, which is received within the second bearing receiving space, and which supports the drive shaft; and a seal member provided within the seal receiving space, and arranged to seal between the drive shaft and the pump housing.

A threaded spindle machine includes a metal middle housing part (12) arranged between housing end caps (24) and forming a fluid chamber (16) for receiving a plurality of threaded spindles rotatably supported in the housing end caps (24); an insert (18) adhered into the middle housing part, which insert forms a wear-resistant running surface for the threaded spindles on the inner wall of the fluid chamber (16) and defines an adhesive gap (20) with the inner surface of the middle housing part (12); and at least one filling channel (26) leading from an outer surface of the middle housing part (12) to the adhesive gap (20), and the filling channel (26) extends from an end of the middle housing part (12) which is adjacent to a housing end cap (24).

A modular rotor assembly for a screw pump including a power rotor and an idler rotor having respective first ends adapted to be disposed in a suction side of the screw pump and respective second ends adapted to be disposed in a discharge side of the screw pump, the power rotor including a balance piston adapted to be disposed within a pump housing of the screw pump with a radial clearance between an entire circumference of the balance piston and the pump housing is in a range between 1 micron and 200 microns, wherein the power rotor is provided with a tapered bearing surface configured to define a wedge-shaped, radial gap axially intermediate the power rotor and the idler rotor.