Improved solids handling in rotary positive displacement machines, where the machines are based on trochoidal geometry, can be achieved through the use of solids-handling features on the surface of the rotor and/or stator and/or by the use of modified seals mounted on the rotor or stator. In at least some embodiments the rotary machines comprise a helical rotor that undergoes planetary motion relative to a helical stator.

A flexible impeller pump designed for use in dispensing a flowable food product is disclosed. The flexible impeller pump includes a cover, impeller assembly and a pump body that are assembled to create the pump without other separate components. The components can be permanently connected to each other to create a disposable pump or can be disassembled for cleaning and reuse. The impeller assembly includes an impeller shaft and a flexible impeller molded over the impeller shaft to prevent separation. The impeller assembly is received within the pump body and the cover is secured to the pump body. The cover includes a seal that is molded over the pump body to prevent separation of the seal from the cover. The impeller shaft extends through the pump body and is coupled to a drive shaft of an electric motor that is operable to drive the impeller pump.

An annular seal, such as for use in a fracking pump, that is designed to exclude debris from entering the sealing gland, and is designed to enhance seal stability and extrusion resistance during high-pressure pulsation events. The seal includes a heel side configured to fit within an annular groove of a first component, a sealing side opposite the heel side that is configured to seal against a second component, and opposite leading and trailing sides that are radially interposed between the sealing and heel sides. The heel side may have a flat heel surface in transverse cross-section. The sealing side may have a concave portion that is configured to open toward and face the second component. The leading side is configured to face toward upstream fluid, and may have a flat leading surface in transverse cross-section that is oriented perpendicularly to a longitudinal axis of the seal.

A rotary piston engine comprises a housing (10), which forms an interior space (11), and at least two rotary pistons (20, 30), which are arranged in the interior space (11). Formed on the interior space (11) are an inlet opening (13) and an outlet opening (15) to guide a fluid through the interior space (11). The rotary pistons (20, 30) are thereby driven by fluid flowing through. Each rotary piston (20, 30) has on its outer circumference at least two sealing strips (21, 31). According to the invention each rotary piston (20, 30) comprises at least two cavities (27, 37), in each of which a tube (38B) or an elastic solid rod is arranged. The sealing strips (21, 31) project into the cavities and against the tube (38B) received therein or the elastic solid rod. Through the tube (38B) or the rod, the sealing strips (21, 31) are pushed radially outwards.

A high speed, rotary lobe gear pump assembly is provided which combines a positive displacement lobe gear pump having wipers with a centrifugal pump utilizing an impeller. The centrifugal pump feeds high pressure fluid flow directly into the lobe gear pump allowing the gear pump to rotate at high speeds without cavitation. The high speed capability of the pump assembly allows the lobe gear pump to operate without speed reduction gearing for the motor shaft.

The invention relates to a rotary piston pump comprising a housing with a housing interior, an inlet opening, and an outlet opening; a first rotary piston which is mounted within the housing interior in a rotational manner about a first rotational axis; and a second rotary piston which is mounted within the housing interior in a rotational manner about a second rotational axis. The first rotary piston and the second rotary piston engage into each other in a region between the first and the second axis and displace liquid. The first rotary piston has a frame assembly which comprises multiple mutually spaced plates and is at least partly filled and enveloped with a polymer material.

A hydraulic device for an internal combustion engine or a gearing system, the hydraulic device including a housing featuring a chamber wall structure which delineates a pressure chamber for a pressurised hydraulic fluid; an actuating member which can be adjusted in the housing relative to the chamber wall structure in an actuating direction and in an actuating counter direction opposite to the actuating direction in order to adjust the delivery volume or phase position; and a sealing element including a sealing structure and a spring structure which is supported or moulded on one of the chamber wall structure and the actuating member, preferably the actuating member, and presses the sealing structure into sealing contact with the other of the chamber wall structure and the actuating member with a spring force in order to seal off the pressure chamber. The sealing structure and the spring structure are moulded in one piece.

A cartridge vane pump includes: a side plate brought into contact with first end surfaces of the rotor and the cam ring; a cover brought into contact with second end surfaces of the rotor and the cam ring, the cover attached to the body; and an O-ring provided in an outer circumference of the side plate, the O-ring being configured to seal a gap between the outer circumference of the side plate and an inner circumference of the body. The side plate has: a first flange portion configured to restrict movement of the O-ring towards the rotor side; a second flange portion configured to restrict movement of the O-ring towards an opposite side from the rotor. The first flange portion is formed to be able to compress the O-ring with the body in an axial direction of the driving shaft.

A rotary piston engine comprises a housing (10), which forms an interior space (11), and at least two rotary pistons (20, 30), which are arranged in the interior space (11). Formed on the interior space (11) are an inlet opening (13) and an outlet opening (15) to guide a fluid through the interior space (11). The rotary pistons (20, 30) are thereby driven by fluid flowing through. Each rotary piston (20, 30) has on its outer circumference at least two sealing strips (21, 31). According to the invention each rotary piston (20, 30) comprises at least two cavities (27, 37), in each of which a tube (38B) or an elastic solid rod is arranged. The sealing strips (21, 31) project into the cavities and against the tube (38B) received therein or the elastic solid rod. Through the tube (38B) or the rod, the sealing strips (21, 31) are pushed radially outwards.

In a gear pump device for rubber extrusion, prolongation of the maintenance intervals is intended by preventing rubber scorch occurring at the gear support-shaft portion. It has a bushing ring 5 inserted in a gear-housing bore 3 of a housing 4. The bushing ring 5 rotatably supports a support-shaft portion 7 of a gear 2 accommodated in the gear-housing bore 3. The bushing ring 5 has a bearing 15 and a sealing means 16 built-in. The sealing means 16 includes a seal ring 22 of which cross section is ]-shaped and which has a first lip portion 22i contacting with the outer peripheral surface of the support-shaft portion 7, a second lip portion 22o disposed outside thereof in the radial direction, and a side wall portion 22m connecting between outer ends in the axial direction, of the first and second lip portions 22i, 22o.