A geared fuel pump (4) operates to supply a determined flow but at low or zero pressure rise. It is planned to add gland packing (46) between support bearings (19) of the pinions (11), or between some of them, to provide hydrodynamic lift for these bearings, by delimiting a closed cavity (47) to provide lift by a fluid with better viscosity properties instead of using the fluid itself that is pumped. Possible application to fuel pumps for aircraft engines, in which the pump (4) is a high pressure pump associated with a low pressure pump.

The present invention relates to an improved liquid pump (1) comprising at least one rotating pumping member (2, 3) and a drive shaft (4) rigidly constrained to said at least one rotating pumping member (2) and configured to drive said at least one rotating pumping member (2) into rotation, said at least one rotating pumping member (2, 3) being completely housed in a pumping chamber (6) formed within a pump casing (7), said drive shaft (4) being partially housed within said pump casing (7), between said drive shaft (4) and said pump casing (7) there being provided at least one liquid-tight seal (8) for preventing leakage of said liquid along said drive shaft (4), said pump (1) comprising a suction duct (9) in liquid communication with said pumping chamber (6) and a delivery duct (11) in liquid communication with said pumping chamber (6).

According to the invention, inside said pump casing (7) a flushing chamber (13) is formed in liquid communication with said suction duct (9) or with said delivery duct (11), said drive shaft (4) passing through said flushing chamber (13), said at least one seal (8) having at least one portion (80) facing said flushing chamber (13) so that the flow of said liquid running inside said flushing chamber (13) laps said portion (80) of said seal (8).

A gear pump is provided, for example, to convey liquid fuel in a fuel-operated heating apparatus. The gear pump includes a conveying chamber in a pump housing, a housing cover which closes the conveying chamber at least in regions, a conveying gear wheel which in the conveying chamber is rotatable about a rotation axis, a drive shaft which for co-rotation about the rotation axis is coupled to the conveying gear wheel, a first bearing unit for mounting the drive shaft on a first axial side of the conveying gear wheel, and a second bearing unit for mounting the drive shaft on a second axial side of the conveying gear wheel.

A pump device is configured so that a first drive shaft 20 for driving a first pump element E1 and a second drive shaft 40 for driving a second pump element E2 are connected through a third drive shaft 50, and a first joint 51 and a second joint 52 are respectively connected between the first drive shaft 20 and the third drive shaft 50, and between the second drive shaft 40 and the third drive shaft 50, each of the first joint and the second joint being configured to permit a joining angle change or a change in an amount of eccentricity between the corresponding drive shafts. As a result of this configuration, a flexural deformation produced in the first and second drive shafts 20, 40 can be absorbed by means of the first and second joints 51, 52, and thus it is possible to suppress the problem of the flexural deformation of one of the first and second drive shafts 20, 40 affecting the other.

One or more techniques and/or systems are disclosed for mitigating fluid loss or leakage from a fluid pump with a rotating shaft driving a pumping mechanism. A one-piece, combined packing gland-bushing component can have an internal seal that allows for use of lubricants at higher pressures. Further, the combined packing gland-bushing component can be configured with a removal component that allows for easier removal of the packing gland-bushing component from a pump shaft, and shaft packing box.

Disclosed is a hub and a bearing which cooperate to hold a shaft in steady axial alignment with a rotor. In a preferred embodiment, the shaft is coupled to the rotor of a fluid gear pump. The gear pump is located in a pump assembly between a front cover and a rear casing. A hub receiving pocket is formed in the front cover, and the hub is connected to the front cover for receipt within the hub receiving pocket. The bearing is surrounded by the hub such that the shaft runs through the bearing to be coupled to the rotor of the gear pump. A pair of high pressure seals are located within the hub at which to surround the shaft and prevent leakage. The bearing being surrounded by the hub stabilizes the shaft to minimize wobbling in response to axial and radial loads to which the shaft is subjected while rotating.

A gas processing system includes a vessel defining a cavity for processing a gas. The vessel includes a process gas inlet for accepting process gas at an input pressure, and a process gas outlet for discharging process gas at an output pressure. The gas processing system further includes a shaft coupled to the vessel and a multistage sealing system comprising multiple seals spaced along the shaft. The shaft is configured to transfer mechanical energy to or from gas in the vessel. Each adjacent pair of seals defines a corresponding pressure space therebetween. One of the pressure spaces is an equalizing pressure space in hydraulic communication with the process gas inlet via a flow line, such that in operation, pressure in the equalizing pressure space is maintained at an equalized pressure with respect to a pressure in the process gas inlet.

A double-flow pump with a housing which has at least one inlet, at least one outlet and a conveyor housing with two single-part or multi-part conveyor units which convey a conveying medium from the inlet in opposite directions to the outlet, the conveyor units have shaft ends which are mounted in bearings, the bearings are each arranged in a bearing housing, wherein the shaft ends are detachably connected to the conveying units.

A pump is driven by rotation of an electrical motor drive shaft. An eccentric drive unit includes an eccentric member coupled between the motor drive shaft and the pump drive shaft. The eccentric member has an offset portion parallel to and offset from the motor axis for orbiting around the motor axis. A flexible boot encloses the offset portion. A pump end static seal seals a pump end of the boot at an interface between the eccentric member and the pump drive shaft. A motor end static seal seals a motor end of the boot at a motor end of the eccentric member.

An eccentric screw pump with a rotor of a pump drive shaft circling essentially about a fixed axis relative to a stator in a bearing block, which pump drive shaft is rotationally driven by a motor drive shaft of a motor, a power train and a screw conveyor, which revolves in a rotating-oscillating manner in a screw flight of the stator, wherein the power train provides the screw conveyor with its drive torque and the power train adapts the differences of the motion sequences of the screw conveyor and of the pump drive shaft. There is thereby an air gap between the motor drive shaft and the pump drive shaft, wherein the motor drive shaft supports a motor-side coupling half and the pump drive shaft supports a pump-side coupling half, which are connected to one another in a torque-transmitting manner by means of magnetic forces across the air gap, wherein the air gap is penetrated by a seal, which hermetically separates the motor region from the rest of the eccentric screw pump.