Barmag Barmer Maschinenfabrik Ag

Barmag Ag

Siegfried Hertell

Heinz Schippers

Dieter Otto

Claus Kirchherr

Horst Kahl

Otwin Eich

Robert Lange

Siegfried Hoffmann

Artur Hager

A hydraulic gear pump for the oil lubrication system of an automobile engine is disclosed, and wherein the meshing teeth of the gears define fluid cells which are expanded in the intake portion and receive the fluid from an inlet, and then compressed in the discharge portion to expel the fluid. The inlet to the pump includes at least two parallel fluid lines which are each connected to a tank. A pressure controlled valve is connected to one or both of the fluid lines, and during the normal operating range of output pressure, the valve is controlled by the pressure in the pump discharge chamber so as to decrease the flow through the lines from a maximum flow rate to a lower flow rate as the output pressure increases. In the event the engine and oil are cold, the output pressure will increase beyond the normal operating range, since the oil consumption is small. To heat this oil, the valve also includes means for throttling a portion of the output of the pump when the output pressure reaches a predetermined relatively high relief pressure which is greater than the normal operating pressure, and this throttling serves to rapidly increase the temperature of the oil. Also, the inlet fluid lines are designed to provide a flow rate during such throttling which is at least about 30% of the maximum flow rate during normal operation, to thereby assure sufficient flow for the throttling function.

Hydraulic gear pump

A hydraulic gear pump is disclosed wherein the meshing teeth of the gears define fluid cells which are expanded in the intake portion and receive the fluid from an inlet, and then compressed in the discharge portion to expel the fluid. The contact ratio of the cooperating driving flanks of the meshing teeth is smaller than the contact ratio of the cooperating sealing flanks of the meshing teeth, which serves to minimize the power requirement of the pump. The inlet to the pump includes at least two parallel lines which are each connected to a tank, and the first line is provided with a fixed throttle and the second line is provided with a pressure control valve which is controlled by the pressure in the pump discharge line.

Internal gear pump

A gear pump is disclosed which is adapted to produce a large number of independent output streams, and which includes a housing having a cylindrical opening, a toothed gear disposed coaxially within the cylindrical opening, and at least one pinion gear disposed within the cylindrical opening and mounted in meshing engagement with the toothed gear. A plurality of enclosed fluid chambers are disposed in an equally spaced apart arrangement about the periphery of the toothed gear during orbital rotation of the pinion gear, which in one embodiment includes a tooth cover positioned forwardly of the pinion gear, and in another embodiment comprises the spaces between the teeth of the toothed gear. A fluid inlet is provided for delivering a fluid to the cylindrical opening and to each of the enclosed fluid chambers, and a fluid outlet having a one way valve also communicates with each of the fluid chambers. Thus in operation, the teeth of the pinion gear sequentially enter the enclosed fluid chambers, so as to compress the chamber and cause the fluid which has been delivered to the chamber to be expelled through the associated fluid outlet.

Gear pump having multiple outputs

A rotary vane vacuum pump assembly is disclosed which is characterized by the absence of the discharge of lubricating oil with the exhaust airstream, and which includes an internal stator and a surrounding rotor. Pivotal vanes are mounted on the interior of the rotor, so as to define a plurality of air chambers which expand and contract as the rotor rotates about the stator. Also, a freely rotatably cylindrical sleeve is positioned between the stator and vanes, so that the relative sliding contact of the vanes on the surface of the sleeve is minimized, to thereby eliminate the need for internal oil lubrication. In one preferred embodiment, a hydraulic pump is joined to the vacuum pump to form a compact assembly, and wherein the hydraulic pump supplies oil to the bearings which mount the rotor.

Rotary vane pump having a plurality of inlet and outlet slots in a

A gear pump is disclosed which is adapted to convey a polymeric melt without significant leakage, and which comprises a pair of intermeshing gears. One of the gears is driven by a drive shaft which extends through a journal bore in the pump housing, and a by-pass duct extends between the journal bore and an area in the internal chamber of the pump which is adjacent but spaced from the intermeshing teeth and where the fluid cells defined by the intermeshing teeth are expanding. Also, at least one root of one of the gears includes a channel which leads to the area of the by-pass duct, and so that an intermittent suction resulting from the expanding fluid cells acts to withdraw any melt from the journal bore of the drive shaft and through the by-pass duct, to thereby prevent leakage of the melt outwardly through the journal bore.

Gear pump with leakage fluid intermittently communicated to expanding

A seal for the drive shaft of a gear pump for polymeric materials dissolved in a fluid solvent is disclosed, and which is adapted to prevent the polymeric material from leaking and hardening on the drive shaft. The seal includes a pair of axially spaced apart annular packing seals surrounding the drive shaft so as to define an annular chamber, and means for supplying a pressurized shielding inert gas, such as nitrogen, into the annular chamber. An outlet line is connected to the lowest portion of the annular space and leads to an air tight container which also contains a shielding inert atmosphere, and such that any polymeric material which leaks along the drive shaft and enters the annular chamber remains in solution, and is withdrawn into the air tight container. A valve is also provided on the container for periodically draining the withdrawn polymeric material therefrom. The shielding inert atmosphere in the annular chamber and the container prevents the polymeric material from hardening, which can lead to the galling or scoring of the packing seals.

Drive shaft seal for gear pump and method

A positive displacement reciprocating pump for conveying a liquid or gaseous fluid is disclosed and which comprises a fluid enclosure having a movable piston means mounted therein which sealably divides the enclosure into a pumping chamber on one side and an actuating chamber on the other side. The piston means may comprise either a slideable piston or a flexible diaphragm. An inlet valve and a separate outlet valve are each connected to the pumping chamber, and a control system is provided for intermittently supplying a pressurized working fluid to the actuating chamber so as to intermittently move the piston means in the discharge direction, with the piston means being moved in the opposite or suction direction by either the pressure of the fluid being conveyed, or a suitable spring. The control system for advancing the piston means in the discharge direction includes a source of pressurized working fluid, a working fluid line extending between the source and the actuating chamber, and a valve operatively connected to the working fluid line for intermittently opening the line to a discharge tank or the like to release the pressure therein.

Control apparatus for a positive displacement reciprocating pump

A rotary vane pump is disclosed which comprises a cylindrical housing, and a cylindrical rotor eccentrically mounted for rotation within the housing. The rotor includes a slot mounting a pair of oppositely oriented hook-shaped vanes, so as to define a hook space adjacent each end of the overlying vanes. A fluid, such as lubricating oil, is delivered to each hook space during that portion of its rotation shortly before its bottom dead center position, and the delivered fluid is pressurized during that portion of its rotation shortly after its bottom dead center position to assist in moving each vane outwardly from its bottom dead center position.

Rotary vane pump

A positive displacement reciprocating pump for conveying a liquid or gaseous fluid is disclosed and which comprises a fluid enclosure having a movable piston means mounted therein which sealably divides the enclosure into a pumping chamber on one side and an actuating chamber on the other side. The piston means may comprise either a slideable piston or a flexible diaphragm. An inlet valve and a separate outlet valve are each connected to the pumping chamber, and a control system is provided for intermittently supplying a pressurized working fluid to the actuating chamber so as to intermittently move the piston means in the discharge direction, with the piston means being moved in the opposite or suction direction by either the pressure of the fluid being conveyed, or a suitable spring. The control system for advancing the piston means in the discharge direction includes a source of pressurized working fluid, a working fluid line extending between the source and the actuating member, and a valve operatively connected to the working fluid line for intermittently opening the line to a discharge tank or the like to release the pressure therein.

A seal for the drive shaft of a gear pump for melted polymeric materials is provided, which includes a reduced pressure zone, a mechanical packing seal, and a liquid filled chamber positioned in succession along the drive shaft. The liquid is a solvent for the polymeric material, and it is maintained under a pressure slightly above that in the reduced pressure zone. Thus a small quantity of the liquid tends to move axially into the reduced pressure zone where it dissolves any polymeric material leaking thereinto. A failure of the seal may be readily detected by monitoring the volume of the liquid, since any polymeric material leaking axially through the packing seal will be dissolved by the liquid in the chamber, thereby increasing the volume of the liquid.

Seal for high pressure pump or the like

A method and apparatus for lubricating a vacuum pump, preferably a rotary vane vacuum pump, wherein the pump rotor is mounted on a hollow drive shaft continuously fed with a lubricating oil stream under excess pressure from an oil pump, radial openings being provided in the hollow shaft for the outward supply of lubricating oil to the elements being lubricated with the lubricating oil stream from said oil pump being fed under excess pressure as a pulsating and preferably intermittent flow stream into the interior of the hollow shaft.

Oil lubrication of vacuum pump with pulsating oil feed

A motor fuel feed pump with a tappet operated piston or membrane wherein the tappet is linearly guided and sealed in a housing segment which projects into the cylinder chamber of the pump on its suction side or its pressure side with inlet and outlet means positioned such that the motor fuel flows around and in direct contact with the projecting housing segment.

Motor fuel feed pump

A rotary vane pump is provided which comprises a cylindrical housing, and a cylindrical rotor mounted within the housing. The rotor includes a number of radial guide slots extending axially along the length of the rotor, with each slot having a depth along at least a portion of its axial length which extends to the axis of the rotor. A blade is slideably disposed in each slot, and has a height which generally corresponds to the depth of the slot. This arrangement permits the rotor to be compact in size, and yet able to provide an adequate area of contact between the blades and rotor slots in the extended position of the blades.

A hydraulic flow control apparatus is provided which is adapted to provide a constant pressure differential between a pump and an external load. The apparatus includes a housing, and a balance piston slideably mounted therein. The pump pressure acts to bias the piston in a direction toward a pump bypass position, and the piston is urged in the other direction and toward its operating position by the consumer pressure and a spring. Means are also provided whereby the pressure of the pump necessary to move the piston toward its bypass position and against the force of the spring, may be minimized during operation in the idling mode, to thereby minimize power consumption.

Growing community of inventors

Radevormwald, Germany

Siegfried Hertell