Abstract: The invention relates to a feed pump for delivering fluid media, wherein the pump bearings are lubricated by the feed medium itself. Connecting channels with valve devices are provided on the suction side and on the pressure side upstream and downstream, respectively, of a displacement element and link the bearing area of the pump with the production channel. Said connecting channels are configured as straight bores in the pump housing. The valve devices are configured as tappets that are disposed in the associated connecting channel sections so as to be displaced while being tight with respect to suction.

Abstract: A geared feed pump has a housing having a pump chamber in which a rotationally driven pair of gear wheels meshing with one another is disposed for pumping medium out of a suction chamber that communicates with a supply tank, along feed conduits, formed between the circumferential surface of the gear wheels and the circumferential walls of the pump chamber, into a pressure chamber. A drive shaft connected with one of the gear wheels via a coupling member is disposed inside the housing in a coupling chamber. The coupling chamber has a connection with the pressure chamber, so that lubrication of the coupling member is effected by the pumping medium.

Abstract: In a rotary pump for a braking apparatus, a discharge trench is formed on an axial direction end surface of a second side plate that forms a mechanical seal. As a result, rotors are pressed back toward a side of a first side plate by a discharge pressure of brake fluid channeled to the discharge trench. Accordingly, a force pressing the rotors toward the second side plate is reduced and frictional resistance is reduced.

Abstract: Roller vane pump, in particular suited for pumping fluid in a continuously variable automatic transmission of a motor vehicle, provided with a pump housing accommodating a substantially cylindrical carrier, which is rotatable about a central axis, and a cam ring encompassing the carrier in the radial direction, whereby a radial clearance between the carrier and the cam ring varies along a circumference of the carrier, and with a pump shaft extending co-axial with said central axis through the carrier, characterised in that there is provided in the pump housing a bearing bush having an essentially cylindrical central bore through which the pump shaft extends.

Abstract: A pump for conveying molten masses of polymers and/or elastomers comprising a pump body in which are formed an inlet duct for entry of the material, an outlet duct for discharge of the material and a central body communicating with the inlet and outlet ducts and destined to house at least one gear mounted on a motorized shaft for conveying the material from the inlet duct toward the outlet duct. The pump body consists of two parts that can be assembled together, each part of the pump body comprising at least one through hole communicating with the central chamber, so that said at least one shaft of the gear is rotatably supported directly in the pair of opposite facing holes of the two parts of the pump body.

Abstract: The invention relates to a feed pump for fluidic media, comprising a displacement body that is mounted in a pump housing and equipped with slide bearings and connecting channels that connect the slide bearings to the produce channel on the suction side for recirculating the fed medium that lubricates the slide bearings. The connecting channels are linked to control channels that lead to the exterior and guide channels are provided in the extension of the connecting channels in the housing of the cover. Said guide channels accommodate the valve plungers, each of which has a constriction. The section of the valve plunger lying adjacent to the product channel has a length and a diameter, which correspond to the length and diameter of the connecting channel.

Abstract: A gear pump comprises a casing and gear rotors disposed therein. The gear rotors are lodged in bearing sections of plain bearings that are lubricated by the pumping medium. They have at least one cooling duct which is embodied such that cooling varies along the circumference and/or in the longitudinal direction and/or in the radial direction of the plain bearing.

Abstract: A spindle assembly for a rotary mower comprises a spindle that is drivingly connected between an output shaft of a hydraulic motor or other rotary power source and a horizontal blade assembly, and a spindle housing that rotatably supports the spindle for rotation and thrust loads. The spindle is formed from conventional steel rod stock and is machined to produce an upper end of reduced diameter. An impeller and thrust washer fits on the narrower upper end of the spindle and is held in place by a tapered snap ring that fits in a tapered groove in the spindle. In at least one embodiment, radial grooves on the washer facilitate oil flow and assist to impel or pump oil or hydraulic fluid outwardly as the washer rotates. In various embodiments, case drain oil pressure or oil pressure produced by the washer causes oil flow over the spindle assembly bearing surfaces. The spindle assembly can include an oil leak detection passageway.

Abstract: A hydraulic pump assembly includes a pump housing having a chamber defined therein, wherein the chamber includes a pair of cylindrically shaped portions each defining at least one end wall. The hydraulic pump assembly also includes a pair of rotary pump elements disposed for rotation within the cylindrically shaped portions of the chamber, and which cooperate to create a hydraulic pressure. The hydraulic pump assembly further includes a pair of cylindrically shaped shafts each having at least one end wall, and disposed within the pair of cylindrically shaped portions of the chamber and within the pair of pump elements. The shafts are fixed for rotation and are axially shiftable with respect to the pump elements. A hydraulic fluid within the chamber stabilizes at least one of the axially shiftable shafts such that the end face of the shaft is spaced from the end wall of the cylindrically shaped portion of the chamber when the hydraulic pump is in use.

Abstract: Roller vane pump, in particular suited for pumping fluid in a continuously variable automatic transmission of a motor vehicle, provided with a pump housing accommodating a substantially cylindrical carrier, which is rotatable about a central axis, and a cam ring encompassing the carrier in the radial direction, whereby a radial clearance between the carrier and the cam ring varies along a circumference of the carrier, and with a pump shaft extending co-axial with said central axis through the carrier, characterised in that there is provided in the pump housing a bearing bush having an essentially cylindrical central bore through which the pump shaft extends.

Abstract: A hydraulic pump assembly includes a pump housing having a chamber defined therein, wherein the chamber includes a pair of cylindrically shaped portions each defining at least one end wall. The hydraulic pump assembly also includes a pair of rotary pump elements disposed for rotation within the cylindrically shaped portions of the chamber, and which cooperate to create a hydraulic pressure. The hydraulic pump assembly further includes a pair of cylindrically shaped shafts each having at least one end wall, and disposed within the pair of cylindrically shaped portions of the chamber and within the pair of pump elements. The shafts are fixed for rotation and are axially shiftable with respect to the pump elements. A hydraulic fluid within the chamber stabilizes at least one of the axially shiftable shafts such that the end face of the shaft is spaced from the end wall of the cylindrically shaped portion of the chamber when the hydraulic pump is in use.

Abstract: A fluid transfer machine includes a positive displacement, rotary-type pumping mechanism driven by a drive shaft. The drive shaft is lubricated and cooled by locating the drive shaft in a primary flow path in the machine. Fluid is directed from the inlet through a passage that intersects a cavity surrounding the drive shaft, at a location between a pair of journal bearings. The fluid then continues directly to the suction side of the pumping mechanism. The drive shaft could also be located on the pressure side of the pumping mechanism. The primary flow cools and lubricates the drive shaft and drive shaft bearings, and reduces the size and complexity of the machine, as additional cooling and lubrication flow passage(s) are not required.

Abstract: The present invention relates to a vane rotary machine such as a vane pump or a vane motor. The vane rotary machine has a rotor (15) supporting vanes (60) thereon and housed in a cam casing (10), and a main shaft (40) attached to the rotor (15) and rotatably supported by a bearing assembly (200, 250). A working fluid from a discharge port (13) is branched and led to the bearing assembly (200, 250) by a fluid path (180). The main shaft (40) has a working fluid introduction recess (220) defined in a region thereof in which the bearing assembly (200, 250) is disposed, and the main shaft has a reduced diameter in the working fluid introduction recess. The working fluid is introduced into the working fluid introduction recess (220).

Abstract: A fluid transfer machine includes a positive displacement, rotary-type pumping mechanism. The pumping mechanism is driven by a drive shaft. The drive shaft is lubricated and cooled by locating the drive shaft in the primary flow path through the machine. The primary flow is directed from the inlet through a passage that intersects the drive shaft, at a location between a pair of journal bearings or sleeves. The fluid then continues directly to the suction side of the pumping mechanism. The drive shaft could also be located on the pressure side of the pumping mechanism. The primary flow cools and lubricates the drive shaft (and drive shaft bearings), and reduces the size and complexity of the machine, as additional cooling and lubrication flow passage(s) are not necessary.

Abstract: An object of the present invention is to provide a scroll compressor that improves assembly precision and the engagement projections are not easily damaged even when a strong force is applied to the Oldham ring during operation; in order to attain this object, a scroll compressor is provided wherein a fixed scroll member comprising an end plate and an involute wrap provided on one face of the end plate, and an orbiting scroll member comprising an end plate and an involute wrap provided on one face of this end plate, and which form a plurality of compression chambers in combination with the involute wrap of the fixed scroll member, wherein a mechanism that prevents autorotation of this orbiting scroll memberand permits rotation of the orbiting scroll member with respect to fixed scroll member is provided between the orbiting scroll member and fixed scroll member.

Abstract: A pump is disclosed, including a motor and a pump housing, for pumping mixed gas and liquid. The pump includes two intermeshed screw members for providing progressive cavities for transporting mixed fluids, within a pumping cavity, from a suction passage to a discharge reservoir of the pump housing. It further uses pumped product to provide cooling and lubrication to the motor and to bearings and timing gears of the screw members. By using pumped product for lubrication and cooling, the need for seals is eliminated, thereby reducing the need for maintenance. This makes the pump package advantageous for subsea deployment for use in pumping nearly depleted wells which may be manifolded together to provide adequate product flow.

Abstract: To provide a gear pump for carrying high viscous liquid, which keeps a bearing in a free state and enhances reliability relative to a leakage of cooling medium and a leakage of molten resins.

Abstract: The invention relates to a spin pump for conveying a liquid polymer melt. To drive the conveying means enclosed in the pump housing, a drive shaft is provided, which extends through the pump housing in a bearing bore, and which comprises an external end for connecting to a drive. To seal the outward extending drive shaft, a cooling sleeve is employed which connects in a pressure tight fashion to the pump housing. The cooling sleeve surrounds the drive shaft with a narrow gap therebetween, and the outer surface of the cooling sleeve is cooled by a coolant for increasing the viscosity of the polymer melt which enters the gap between the drive shaft and the cooling sleeve. With an increased viscosity, the melt acts to seal the gap without interfering with the rotation of the drive shaft.

Abstract: A method stabilizes the temperature in a gear pump lubricated with material to be delivered. At least one housing part has at least two slide bearings in which shafts are mounted and are lubricated by medium to be delivered. A medium is adjusted in a temperature stabilizer to a predetermined temperature and then flows firstly through the housing part and secondly through shafts and/or slide bearings to stabilize the temperature.

Abstract: An air-cooled shaft seal comprises an annular body having an inner surface and an outer surface. One or more helical channels are formed on the inner surface. A plurality of external surfaces such as radial fins are disposed in axially spaced relationship on the outer surface, and extend radially in a direction away from a longitudinal axis of the annular body. The external surfaces present a substantially increased surface area through which heat energy is transferred from polymeric material contained in the seal to the atmosphere. The seal may be installed on one or shafts of a gear pump for transporting a viscous material under pressure.

Abstract: A journal bearing comprises a body having a central longitudinal axis, a cylindrical inner surface coaxially disposed around the longitudinal axis and defining an axial bore, and an outer surface including a peripheral planar section. A lateral face is disposed on an end of the body, and extends between the outer and inner surfaces of the body. A feed channel is formed in the lateral face at an acute angle with respect to the planar section and in an inward direction with respect to the axial bore. A first end of the feed channel communicates with the outer surface of the bearing at a location proximate to the planar section, and a second end of the feed channel communicates with the axial bore. A pocket is formed in the inner surface of the bearing in communication with the second end of the feed channel and extends along a substantially helical path from the lateral face of the bearing. At least a portion of the pocket has a width of greater magnitude than a corresponding depth of the portion.

Abstract: An air-cooled shaft seal comprises an annular body having an inner surface and an outer surface. One or more helical channels are formed on the inner surface. A plurality of external surfaces such as radial fins are disposed in axially spaced relationship on the outer surface, and extend radially in a direction away from a longitudinal axis of the annular body. The external surfaces present a substantially increased surface area through which heat energy is transferred from polymeric material contained in the seal to the atmosphere. The seal may be installed on one or shafts of a gear pump for transporting a viscous material under pressure.

Abstract: A rotor for an internal gear pump adapted to improve the lubrication of the internal gear parts. A radial groove is added to the inner face of an internal rotor. The groove extends radially between the center of the rotor and an outer diameter of the rotor. The groove provides a communication channel between the outer circumference of the rotor and the parts located within the rotor's inner diameter, namely the idler gear and idler pin. The disclosed grooved rotor improves the flow of fluid to the interface between the idler gear and the idler pin of a typical internal gear pump. Should the lubricating properties of the fluid be reduced and/or the operating pressures of the pump increased, the improved rotor design will provide lubrication of the internal rotary parts, thereby decreasing the friction among the parts and extending the overall productive life of the pump.

Abstract: The invention concerns an oil-sealed vane-type rotary vacuum pump (1) with a rotor (3) and an oil pump (45, 46) whose suction chamber is fitted with feeds (64, 65) for gas and oil. In order to simplify the supply of a gas/oil mixture to the vacuum pump, the invention proposes that the gas and oil feeds (64, 65) are disposed in such a way that initially only oil and subsequently both oil and air are aspirated into the volume swept by the oil pump (45, 46) as it rotates.

Abstract: The present invention relates to an eccentric-type vane pump and, in particular, to an eccentric-type vane pump being capable of generating minimum heat and noise due to frictional force produced from rotation of the vane pump. The vane pump comprises a rotor connected to a rotor shaft having vanes slidably received in vane grooves and recessed within a space in the periphery of the rotor for moving radially by rotation of the rotor. A cylinder ring is positioned eccentrically around the rotor and is rotated by the frictional force produced from abutting the front end of the vanes. A pump chamber is formed between the rotor and the cylinder ring. A cylinder body is provided having a bearing between the outer surface of the cylinder ring and the cylinder body. A front body is connected to a first end of the cylinder body. One end of a rotor shaft is supported on a recess formed on one side of the front body.

Abstract: A compressor (30) for use in a refrigerator, which has a rotary shaft (33) supported by bearings (39 to 42) to be lubricated by a liquid refrigerant and is adapted to permit the rotary shaft 33 to continue rotating for a while after a liquid refrigerant pump (36) is stopped at, for example, a power failure, thereby preventing the bearings (39 to 42) from being damaged. To that end, the compressor (30) is further provided with a header (52) for storing a predetermined amount of a high-pressure liquid refrigerant, and with check valves (51, 54 and 56) for maintaining the internal pressure of this header (52) at a high pressure for a predetermined time period after a power failure occurs.

Abstract: A gear pump includes a pump body having a pair of cylindrical gear chambers, and high pressure and low-pressure fluid ports into the chambers. A pair of cover plates enclose the open ends of the pump body. A drive gear on a drive shaft and a driven gear on an arbor shaft are rotatably supported on a pair of bearing assemblies within the gear chambers, with the drive shaft extending through an opening in at least one of the cover plates for rotation of the gears. A recirculating flow path is provided to draw fluid from the high pressure fluid port along the sides of the gears, between the bearings and the sides of the gears, axially through the bearings from the inner side of the bearings to the outer side of the bearings, and through channels formed in the respective adjacent cover plates to direct the fluid to a pair of return bores in the pump body.

Abstract: The invention relates to a fluid-conveying machine, in particular, a pump having a component rotating in a stationary housing part inside an annular gap. The stationary housing part separates an interior having a higher product pressure from an exterior having a lower pressure. A rotating component is mounted in an external bearing which is sealed with respect to the interior via a sealing system. In order to improve the sealing, the invention provides that the annular gap is formed between two sliding bearing shells which comprise extremely hard, wear-resistant materials and, in accordance with the operating principle of a radial sliding bearing, form a first pressure-reducing stage. A feedback device, which feeds back the leakage from this first sealing stage into the conveying process of the machine, is connected downstream of the first pressure-reducing stage. A second sealing stage is arranged axially downstream of the feedback device.

Abstract: A gear pump has a housing, a pump shaft supported in a housing wall by a bearing, and a pumping gear supported on the pump shaft which is operable to pump newtonian and non-newtonian liquid of different densities. A relief collection zone is arranged on a low-pressure side of the bearing for collecting leakage liquid passing through the bearing along the shaft. At least two return ducts or bores are provided which connect the collection or relief zone with a suction side of the pump in order to return the collected leakage liquid.

Abstract: A scroll compressor has a fixed scroll and an orbiting scroll nested with one another within a shell. The orbiting scroll has a base plate with a pair of opposed slots formed therein, and a spiral wrap extending axially from the base plate. The fixed scroll has a base plate and a spiral wrap extending axially from the fixed scroll base plate nested with the spiral wrap of the orbiting scroll. A pair of towers extends axially downwardly from the fixed scroll base plate, each tower having a slot formed therein, diametrically opposed from the slot formed in the other tower. An Oldham coupling has an annular ring with an irregular oval profile which closely follows the outermost radial surface of the spiral wraps as the scroll compressor operates. The Oldham coupling also has an asymmetric shape with respect to any vertical plane bisecting a central axis of the Oldham coupling. A pair of opposed keys extend axially from a first surface of the Oldham coupling slidingly engaging the slots in the towers.

Abstract: A vane-type rotary compressor has a compression chamber delimited by a cylinder and front and rear covers secured to opposite ends of the cylinder. The front cover accommodates main and auxiliary shaft seal parts held in contact with a drive shaft. A space defined between the two shaft seal parts communicates with a suction stroke portion of the compression chamber via at least one bypass passage. Accordingly, the pressure and temperature acting on the main shaft seal part are substantially the same as those acting on the suction stroke portion, thus reducing the pressure and temperature on the main shaft seal part.

Abstract: A hydraulic pump unit is encased between a pump body and a pump cover. A bearing hole passes through the pump body and is formed in the pump body. A drive shaft and a bearing bush are inserted into the bearing hole. The drive shaft drives the hydraulic pump unit and the bearing bush supports the drive shaft. At an end portion of the bearing hole, a seal chamber is formed. The seal chamber encases a seal member. An oil groove is formed inside the bearing hole. The oil groove connects the hydraulic pump unit side with the seal chamber and carries hydraulic oil for lubrication. The oil groove is formed in such a manner that a sectional area in the seal chamber side is greater than a sectional area in the hydraulic pump unit side. The bearing bush comprises a plurality of bush pieces arranged at a predetermined interval in an axial direction of the bearing hole.

Abstract: A lubrication path in a gerotor motor extending in the face of the rotor or an adjoining surface from a gerotor cell having relatively high pressure to the central cavity of the device to provide cooling and lubrication fluid thereto.

Abstract: A feed pump having a pair of gears in a housing that mesh with each other and are driven to rotate in a pump chamber. The pair of gears supply fuel from an intake chamber connected to a storage tank, along a supply conduit in the housing constituted between the end face of the gears and the circumference wall of the pump chamber, and into a pressure chamber. In order to introduce lateral forces acting on the gears directly into the pump housing the gears are each supported on a housing pin, which is embodied as being of one piece with the housing of the feed pump and protrudes into the housing.

Abstract: A hydraulic pump includes a pump body having a bearing hole and formed with a seal chamber at an end of the bearing hole and an oil groove therein, the oil groove ensuring hydraulic communication between the pump unit and the seal chamber, a pump cover attached to the pump body to define a concavity for accommodating a pump unit, and a drive shaft arranged through the bearing hole of the pump body. A bearing bush, which is arranged through the bearing hole of the pump body to support the drive shaft, includes bush lugs disposed in the axial direction of the bearing hole of the pump body. Two of the bush lugs disposed at both ends of the bearing bush have seams located circumferentially distant from each other.

Abstract: A sliding vane pump is provided with side plates disposed on opposing sides of the rotor with through holes and grooves in the side plates that cooperate with passageways disposed in the seal head and access head for providing fluid communication to the rotor bearings. As a result, the fluid being pumped is used to lubricate and cool the rotor bearings. Annular grooves disposed in the side plates provide further cooling and lubrication between the side plates and the rotor as well as between the side plates and the seal head and access head. The flow through the pump may be easily reversed by rotating the side plates 180.degree., switching flow through the passageways in the seal head and access head by plugging one passageway and opening another passageway as well as rotating the vanes 180.degree.. The reversal of the flow may be accomplished without disconnecting the companion piping, the prime mover or the electrical wiring.

Abstract: A gear motor has a hydraulic oil drain path through bearings which support the spindle and mounted mower blade. The drain path is through two plain bearings and two opposed thrust bearings to a low pressure port located adjacent to the spindle shaft seal. A drain from the low pressure port through one of the hydraulic motor shafts leads to the case drain. A check valve prevents fluid from leaking through the drain should the spindle shaft seal fail. The plain bearings and thrust bearings have a press fit insert in the shape of a cylinder with a planar lip. The cylinder portion of the insert forms the plain bearing and the planar lip of the insert forms the thrust bearings. The bearing insert cylindrical surfaces have two helical grooves which extend across the cylindrical surface to conduct lubricating oil through the plain bearings. The grooves in the plain bearings communicate with similar grooves in the thrust bearings.

Abstract: A compressor (30) for use in a refrigerator, which has a rotary shaft (33) supported by bearings (39 to 42) to be lubricated by a liquid refrigerant and is adapted to permit the rotary shaft 33 to continue rotating for a while after a liquid refrigerant pump (36) is stopped at, for example, a power failure, thereby preventing the bearings (39 to 42) from being damaged. To that end, the compressor (30) is further provided with a header (52) for storing a predetermined amount of a high-pressure liquid refrigerant, and with check valves (51, 54 and 56) for maintaining the internal pressure of this header (52) at a high pressure for a predetermined time period after a power failure occurs.

Abstract: In order to cool the slide bearing area for the slidable bearing of a gear pump shaft, a slide bearing bush with a slide bearing area and, in the case of the guiding-through of a shaft, a sealing area extends in one piece integrally to the outside, and a cooling-medium guiding system provided in the bush is connected from the outside. This eliminates all sealing problems for the cooling medium feeding to the slide bearing area.

Abstract: A compressor (30) for use in a refrigerator, which has a rotary shaft (33) supported by bearings (39 to 42) to be lubricated by a liquid refrigerant and is adapted to permit the rotary shaft 33 to continue rotating for a while after a liquid refrigerant pump (36) is stopped at, for example, a power failure, thereby preventing the bearings (39 to 42) from being damaged. To that end, the compressor (30) is further provided with a header (52) for storing a predetermined amount of a high-pressure liquid refrigerant, and with check valves (51, 54 and 56) for maintaining the internal pressure of this header (52) at a high pressure for a predetermined time period after a power failure occurs.

Abstract: An oil pump for high performance internal combustion engines suitable for use with race cars and the like wherein extended wear and tolerance maintenance is achieved by supporting the pump gears on shafts extending through the gears. Balanced dual support of the pump gears is achieved by forming bearing openings in the pump lower housing receiving the lower gear shaft portions and lubrication of the lower housing supported gear shafts is achieved by oil passages communicating with the bearings and the lower housing oil outlet cavity. Screw in plugs and retainers are employed to insure effective assembly even under high vibration, and a bolt-on screened oil inlet achieves superior rigidity and ease of replacement.

Abstract: Twin-screw pump, wherein the four conical screws are vertically arranged and are fed with biphase fluid at the two ends, independently of each other, by means of a stream divider and wherein the two screw shafts each have a central axial drilling which connects the delivery chamber to a series of radial channels which end up on the tip of the single teeth of the screws. A preferen-tial stream divider is described.

Abstract: Along a peripheral wall surface of a pump housing at a closure portion where a working fluid in a volume chamber defined by engagement of an inner rotor and an outer rotor, is enclosed, a liquid pressure is relieved by the liquid pressure relieving groove for relieving a liquid pressure of the working fluid from the volume chamber to a sliding gap along an outer peripheral surface of the outer rotor.

Abstract: A gear pump is disclosed having an integrated gear cavity and bearing receptacle that includes a fluid path for lubricating the bearings. The preferred embodiment includes a helical gear pump having a manifold with inlet and outlet ports. The integrated gear cavity and bearing receptacle are located in a one piece molded end cap. The bearing receptacle receives a coupled bearing assembly. Together, the coupled bearing assembly and the bearing receptacle define a supply path outside the bearings along the bearing receptacle and a return path through the bearings so that fluid can pass by, and lubricate, the bearing-axle interface.

Abstract: A hydraulic motor that provides an improved sealing configuration for sealing a shaft with respect to a housing of an internal gear motor or pump of the type commonly known as a gerotor. The hydraulic motor provides a housing having an output end and an input end with an opening extending therebetween. A gerotor is connected to the input end of the housing, and a cover is connected to and covers the gerotor while also receiving and rotatably supporting an end of the shaft. An inlet port and an outlet port are provided in the cover for communicating hydraulic fluid to and from the gerotor. A large roller bearing is coupled to the shaft and disposed within the opening of the housing to rotatably support the shaft. For high pressure applications, a pair of conventional mechanical face seals are coupled to the shaft and disposed within the opening of the housing. A third conventional lip seal may also be utilized as an added level of sealing the shaft with respect to the housing.

Abstract: A rotator includes an axle and an associated rotor component having lamellar vanes. A case component surrounds the rotor component. Chambers arranged symmetrically in relation to the axle are disposed between the lamellar vanes. These chambers are pressurized by oil fed through feed and outlet openings connected to the chambers. Bearing members are arranged in an axial direction on both sides of the rotor component. A conical bearing carries the axial rotor load and is formed by a conical arrangement of juxtaposed surfaces defined by the case and axle. The case includes channels leading from the chambers to the conical surfaces for communicating pressurized oil thereamong. The conical arrangement includes spaced gaskets. Oil pressure applied between the conical surfaces raises the axle off the case. In the absence of oil pressure, the conical surfaces lock as a result of friction between the case and axle.

Abstract: A rotary screw compressor for oil-free air, wherein at least one of the shaft journals (11) of the rotors (10) has a seal arrangement between the rotor (10d) and an oil-lubricated bearing (12). The seal arrangement includes at least three frictionless seals (13, 14, 15) separated by annular chambers (16,17). The outermost annular chamber (17) is connected to a source of pressurized air through a supply channel (19) for supplying blocking air to the seal, and another (16) of the annular chambers communicates with a withdrawal channel (18).

Abstract: An improved self-lubricating bearing arrangement for gear pumps utilizes a system of material feed channels and reservoir pockets to divert a portion of the material being pumped from the pressure side of the intermeshing gears to lubricate the gear-supporting shafts within the bearing arrangement. At each gear shaft, a linear material feed channel is formed in the radial face of the bearing between a pressure relief recess and an axial opening supporting the shaft and a parabolic reservoir pocket is formed within the bearing opening adjacent the shaft to apply diverted polymer to the shaft. Each material feed channel and reservoir pocket is polished to a mirror finish to minimize any tendency of suspended additives in the polymer from adhering to or collecting within the channels or pockets, thereby to prevent unusual or localized wearing of the gear shafts.

Abstract: The invention relates to a pumping process for operating a multi-phase screw pump with at least one feed screw surrounded by a housing having at least one inlet on one side and at least one outlet at its top, in which the intake medium is conveyed parallel to the screw shaft in a continuous low-pulsed stream and continuously discharged at the outlet. This invention also relates to a multi-phase screw pump. In order to prevent the drawbacks usually occurring in dry running phases, the invention proposes that a partial liquid volume flow (liquid circulation) be separated on the pressure side and returned in metered quantities into the intake regions and thus kept in circulation.

Abstract: The present invention relates to a system for pumping an effluent produced by a geologic formation at the bottom of a well, comprising a pump located in the well and rods connecting the pump to the surface. The pump includes at least a stator and a rotor. The rods are rotated by surface means driving the rotor into rotation to pump the fluid and to drive the fluid towards the surface through an annular pipe external to the rods. The system includes a mechanism for holding the rotor in the stator and for transmitting the rotation of the rods to the rotor. The pump includes means suited for allowing injection, from discharge area (26), of at least part of the effluent produced into the mechanism so as to ensure the lubrication thereof.