Abstract: A sealing device with convertible magnetic sealing medium includes a housing with an accommodation cavity formed therein, a rotary shaft rotatably disposed in the accommodation cavity, a first pole piece disposed on the rotary shaft, a second pole piece fitted over the rotary shaft, and a permanent magnet fitted over the rotary shaft between the first pole piece and the second pole piece. The rotary shaft has a first blind hole, a second blind hole, a first via hole and a second via hole. A plurality of first pole teeth are provided in an inner circumferential wall of the first pole piece and a plurality of second pole teeth are provided in an inner circumferential wall of the second pole piece. Magnetic powder is provided between a top surface of each of the first and second pole tooth and the outer circumferential surface of the rotary shaft.

Abstract: A seal assembly for a gas turbine engine employs a first seal forming an oil chamber around a bearing. The first seal is configured to maintain the oil chamber at a first pressure. A second seal forms a ventilating cavity around the oil chamber. The second seal is configured to maintain the ventilating cavity at a second pressure, the second pressure being less than the first pressure and less than an ambient pressure of a primary flow path in the engine. A pressure reducing device is coupled to the ventilating cavity. The pressure reducing device is configured to maintain the second pressure.

Abstract: A stabilizing bushing is constructed of a structural composite including layers of reinforcing fibers in a matrix of synthetic polymeric material, and is inserted between a rotating shaft and a surrounding housing to stabilize the shaft against unwanted radial displacement while rotating within the housing. A plurality of circumferential grooves in the bushing effect a reduction in fluid pressure between one end of the bushing exposed to higher fluid pressures than to which the opposite end of the bushing is exposed. The bushing is constructed in the form of circumferential segments selectively joined together at Z-shaped joints for facilitating the insertion and establishment of a securely integrated stabilizing bushing in position around the shaft.

Abstract: A sealing assembly includes a first sealing member disposed on a fixed body and a second sealing member disposed on a rotating body while facing the first sealing member, such that when the second sealing member rotates, the first sealing member and the second sealing member work in conjunction with each other to generate flow of fluid in a reverse direction and form a fluid barrier, thereby preventing leakage of the fluid.

Abstract: A seal (42, 82) for a shaft (22) of a turbocharger (10) to prevent liquid from leaking out of a bearing housing (16). The seal (42, 82) includes a cylindrical body extending between opposite end faces (116, 118) and has a cylindrical bore extending between the opposite end faces (116, 118) for receiving the shaft (22) therethrough. The cylindrical bore defines an inner surface (106) having at least one striation (112) extending in a helical direction about the shaft (22). Rotation of the shaft (22) relative to the seal (42, 82) causes a pumping effect on liquid present between the shaft (22) and the inner surface (106) of the seal (42, 82), thereby causing the liquid to flow back towards the bearing housing (16).

Abstract: Gear unit with a gear unit housing, a drive-side and an output-side shaft and a gear ratio stage. The gear unit housing has a toothing space in which there are intermeshing toothed wheels and a bearing space separated from the toothing space. The bearing space in which bearing lubricating oil can be collected is operated under atmospheric pressure. The bearing lubricating oil is guided from the bearing space to an oil collecting receptacle external to the gear unit. The toothing lubricating oil collected in the toothing space is fed to the oil collecting receptacle to be at least partially separated from the bearing lubricating oil. In partial vacuum operation the toothing lubricating oil is conveyed from the toothing space into the oil collecting via a delivery pump, and in atmospheric operation, the toothing lubricating oil is conveyed from the toothing space into the oil collecting receptacle via a check valve.

Abstract: An arrangement for sealing a propeller shaft of a marine vessel are specifically applicable in preventing oil leakage via propeller shaft sealing in cases where the draught of a marine vessel is, for some reason, reduced beyond its ordinary value.

Abstract: The transmission for a drive arrangement of a driven machine with an oil supply system has at least one oil collecting receptacle for supplying components of the transmission with oil for lubrication and/or cooling. The oil is supplied from the respective oil collecting receptacle via an oil supply line and an oil supply pump and is returned to the respective oil collecting receptacle subsequently via an oil return line. A vacuum pump is associated with at least one oil collecting receptacle for supplying components of the transmission with oil, and the respective oil collecting receptacle can be evacuated or partially evacuated via the vacuum pump and at least one partial interior of the transmission can be evacuated or partially evacuated indirectly via the oil collecting receptacle via the vacuum pump accompanied by the generation of a defined negative pressure.

Abstract: A shaft seal system which is disposed axially between a first chamber and a second chamber is disclosed. The shaft seal system includes a shaft, a casing that surrounds the shaft, and a seal which is disposed axially closer to the second chamber where the first chamber has a fluid and the second chamber is to be protected from the fluid. In this arrangement, the seal includes a pressure booster.

Abstract: A turbomachine assembly including first and second bodies, in which one of the bodies is rotating relative to the other body around the axis of rotation of the turbomachine, is provided. A tight zone is formed between the bodies and includes a sealing gasket. A flowing fluid, in particular lubricant oil, is able to circulate inside the first and second bodies and to be driven toward the one rotating body from the other body. The one rotating body includes a device for guiding the rotation, in the direction of rotation of the one rotating body, of the flow of fluid inside the one rotating body so as to drive the flowing fluid away from the tight zone.

Abstract: There is provided a slit valve, comprising: a first slit valve portion having a first window therethrough, the first window is sized to permit passage of an object through the first window; wherein the first window is surrounded by a first area of the first slit valve portion; a second slit valve portion that comprises a first sealing element and a first positioning module; wherein the first positioning module is arranged to move the first sealing element in relation to the first window; wherein at least one slit valve portion of the first and second slit valve portions comprises at least one first gas opening for emitting pressurized gas so as to assist in a creation of a first gas cushion between the first area and the first sealing element when the first sealing element is placed adjacent to the first window thus creating a seal between the first and second slit valve portions.

Abstract: A system and method for sealing a shaft disposed for rotation within a casing, where two axially-spaced seal rings of an oil film seal extend around the shaft and define a clearance therebetween. Oil is pumped into the clearance from an oil reservoir and a portion of the oil is received in an annular port defined in the casing between an outer labyrinth seal and one of the axially-spaced seal rings. The oil mixes with a process gas to for an oil and gas mixture. A blower is in fluid communication with the annular port and circulates the oil and gas mixture to a trap where the oil is separated from the process gas and a separated process gas is returned back to the annular port.

Abstract: A helical seal system includes a first component, and a second component rotatable relative to the first component. The second component extends from a high pressure portion to a low pressure portion through an intermediate portion. A helical seal is provided on the intermediate portion of the second component. The helical seal includes at least one thread component having a pitch that is configured and disposed to draw fluids from the low pressure portion toward the high pressure portion when the second component is rotated.

Abstract: The disclosure describes a windback device for a circumferential seal within a turbine engine. The windback device includes an annular collar at one end of an annular fluid seal housing, at least one inclined thread, and a plurality of inclined baffles separately disposed along an outer circumferential surface of a rotatable runner. The housing is adapted at another end for an annular seal. The collar has an opening therethrough sized to receive the runner without contact. The annular seal surrounds and sealingly engages the runner. The threads extend from an inner face of the collar toward the runner. The baffles are separately recessed in or raised above the outer circumferential surface of the runner. The baffles are interposed between the runner and threads. Each baffle is separated from the threads via a radial clearance. Threads and baffles direct lubricant away from the annular seal.

Abstract: Heat exchanger device for a gas seal (1) for centrifugal compressors equipped with a fluid heat exchanger (3) positioned between the gas seal (1) and the housing wall of the seal to keep the temperature of the seal (1) low in the case of high temperatures of the wall and/or compressed gas.

Abstract: The present invention relates to a windback device and method of use to prevent lubricant from leaking from a lubricant sump. More specifically, the present invention is comprised of a windback device within a lubricant sump formed from the coupling of an annular sump housing, an annular fluid seal assembly, and a bearing. The annular housing substantially surrounds the runner to form a chamber. The seal assembly is coupled to a sump housing both of which are adapted to receive a rotatable runner such that a sealed chamber is formed around the runner. A plurality of inclined threads extend along an inner face of the windback device and are angled such that lubricant or fluid splashed from the rotating shaft is redirected away from a shaft seal element of the annular fluid seal and through leak off slots leading to the sump housing chamber.

Abstract: A housing of a Roots pump is configured by joining a lower housing member and an upper housing member that are separable from each other. With the upper and lower housing members joined together, an upper accommodating portion and a lower accommodating portion form a front bearing accommodating portion and a rear bearing accommodating portion, which accommodate whole bearings, respectively. The Roots pump further includes bearing holders attached to the bearings and fixed to the lower housing member so that the bearings are received in the lower accommodating portion in a positioned state.

Abstract: An isolator device, which may be a bearing seal or a bearing isolator, for use hindering fluid flow between components which are rotating relative to each other about a longitudinal axis, the flow being in one direction parallel to this axis, includes a stator for securing to a rotary fixed one of the components and a rotor for securing to a relatively rotating one of the components. The stator has a surface which extends longitudinally and adjacent to a surface of a component, which rotates relative to the stator. The fluid flow is between the two surfaces and the stator surface is non-parallel to the adjacent component surface and is shaped to promote fluid flow in a direction opposing the general fluid flow direction.

Abstract: An adaptor that can be used with rotary fluid equipment will protect mechanical seals and/or packing material adjacent a seal cavity (18) of the equipment. The adaptor includes an annular body (30) with a central bore (32) adapted to receive a shaft (12) of the equipment. When used with mechanical seals the adaptor is receivable in the cavity at the entrance thereto and it has a portion which surface which effects contact with a complementary surface of the seal. When used with packing the adaptor fits within the cavity and defines an outboard extension in which the packing can be received. The bore defines two portions, one of which is close to the shaft (52) and another portion (54) which flares outwardly from the one portion towards the outboard end of the adaptor. Each bore portion has a spiral groove (56, 58) therein, which groove serves to redirect contaminant material contained in fluids surrounding the shaft away from the seal cavity.

Abstract: A viscous seal for fluid transfer devices that deviates from the conventional wisdom of avoiding contact between the seal and a rotating drive shaft of the fluid transfer device. Instead of avoiding contact, contact between the seal and drive shaft is used to effect axial alignment of a sealing sleeve with the shaft. As a result, the viscous seal is compliant in that the sealing sleeve can follow the axis of the drive shaft. Accordingly, the sealing sleeve can fit snugly around the drive shaft for more effective prevention of leakage of low or any viscosity fluid along the drive shaft, but without any significant radial load being applied to the sealing sleeve that might cause undue wear or damage due to galling.

Abstract: An arrangement (120) of members for a throat bushing for rotary fluid equipment includes a first member (122) that is useful for seal cavities that contain conventional packing, and a second bushing member (132) that will be used in conjunction with the first bushing member if the seal cavity utilize a mechanical seal at the remote end of the cavity. Both bushing members (122, 132) are provided with spiral grooves (140) in a central bore thereof for the removal of contaminants from the seal cavity. The distal end face (124) of the first bushing member is contoured to receive a mating proximal end face (144) of the second bushing member or to also receive the abutting face of a packing ring or a lantern ring. The arrangement of the invention allows an operator to switch between the use of a mechanical seal or conventional packing without having to discard his primary seal cavity protector.

Abstract: A segmented labyrinth seal (10) having a windback configuration formed around a rotatable shaft for preventing leakage of oil from a bearing housing having a first face (22) and a second face (23). An exterior cylindrical surface (19) and an interior cylindrical surface (18) extend between the first face (22) and the second face (23). A thread pattern (40) provided on the interior cylindrical surface (18) providing the windback configuration, and configured in a right-hand direction or a left-hand direction. A plurality of profiled teeth (41) form the thread pattern (40) and have first sides (43), second sides (44), and connecting sides (45) extending between the first sides (43) and the second sides (44). Leading edges (47) are formed where the first sides (43) join the connecting sides (45), and trailing edges (48) are formed where the second sides (44) join the connecting sides (45). The first sides (43) and the second sides (44) are slanted toward the first face (22).

Abstract: A shaft sealing apparatus is provided which can easily be assembled and arranged to prevent leakage of a dope from an acetylator or the like system. A screw sleeve having a spiral groove provided in the outer side thereof is mounted on rotary shaft adjacent to a location where the rotary shaft extends through a housing. As the screw sleeve rotates together with the rotary shaft, it can return back the dope into the housing thus providing a sealing effect. The screw sleeve includes six segments fabricated by separating circumferentially into two and axially into three. The six segments are jointed together to assemble a generally cylindrical structure on the rotary shaft. The assembling process can be conducted from two radial directions on the rotary shaft between the housing and each bearing unit supporting the rotary shaft without disassembling the bearing units.

Abstract: A low-friction seal comprising a quasi dimensionally stable sealing ring (44) that is accommodated with radial and axial clearance in a groove (30; 76) of one of two surface, whereby said surfaces are sealed off from each other and can move in a relative position to each other, and the peripheral section of the sealing ring protruding from the groove (30′ 76) is placed opposite the other surface that is to be sealed. Means are provided between the side wall (34; 80, 82) of the groove on the side of the pressure-chamber and the sealing ring (44) in order to prevent pressure from spreading to the bottom (37, 78) of the groove, whereby radial deformation of the sealing ring in the direction of the surface that is to be sealed is avoided.

Abstract: A lubricant leakage stop is provided on the shaft of a rotary device in the form of an annular groove in the shaft. In one embodiment the annular groove is formed with an annular inner surface at the bottom of the groove and with an annular intermediate surface positioned between two portions of the annular inner surface. The intermediate surface has a larger diameter dimension than the two inner surface portions on the axially opposite sides of the intermediate surface. The intermediate surface also has a smaller diameter dimension than that of the two portions of the shaft outer surface on axially opposite sides of the groove. In a second embodiment, the annular groove is formed with an annular inner surface that tapers from the bottom of the groove outwardly to the outer surface of the shaft on one side of the groove.

Abstract: A Roots pump rotates a plurality of rotors by a pair of rotary shafts to draw gas. Each rotary shaft extends through a rear housing member of the Roots pump. An annular shaft seal is fitted around each rotary shaft and is received in a recess formed in the rear housing member. A helical groove is formed in a circumferential side of each rotary shaft. Each helical groove urges oil between the circumferential side of the associated shaft seal and the circumferential wall of the recess to move from a side corresponding to pump chambers toward a gear accommodating chamber when the associated rotary shaft rotates. This preferably prevents oil from leaking to the pump chambers.

Abstract: An improved dual lip radial shaft seal is disclosed. The free end of the dual lip seal extends toward the air side of the seal. Optionally, the dual lip seal has an oil side excluder lip seal, an air side dust excluder lip seal, an elastomeric static seal extending from the elastomeric portion of the dual lip seal. In another optional embodiment, a relief groove is formed in the seal. A unitized seal version is also disclosed with two embodiments.

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: 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: An improved seal for a hydrodynamic bearing which aids in making the bearing less sensitive to changes in load and rotational speed, which is especially useful in hydrodynamic bearing motor in which the bearing is open at both the upper and lower ends. Additionally, a hydrodynamic bearing open at both ends in which the balance of fluid flow or pressure within the total system is maintained, and a seal usable to make a hydrodynamic bearing which is as stiff or stiffer than known standard spindle motors with hydrodynamic bearings which are supported only at one end. Also, a pumping seal useful in a hydrodynamic bearing design to maintain balanced internal fluid pressures during operation to minimize the likelihood of any lubricating fluid being lost during operation is disclosed.

Abstract: A device is provided for sealing a rotor shaft supported on a bearing mounted in a housing of an appliance for compressing or expanding a fluid containing, apart from the housing, at least one rotor mounted therein. The sealing device is situated between the rotor and the bearing around the rotor shaft and includes at least two zero contact or frictionless seals. The sealing device successively includes between the rotor and the bearing a first zero contact seal; a double, reverse lip seal with two lips; and a second zero contact seal. The two lips are partly directed towards one another and partly directed towards the rotor shaft along their backsides. An entry for fluid under pressure opens between the lips, whereby the lips, depending on the pressure between them, are in contact with to the rotor shaft or are lifted from the rotor shaft.

Abstract: The invention concerns a seal housing for a mechanical seal device. The seal device is arranged within a cavity (6) provided with a spiral notch (11) at its mantle surface for feeding particles in the liquid in a direction away from the seal means (7) and toward an impeller. The spiral notch opening axially toward the impeller.

Abstract: A labyrinth seal device formed of a rotor and a stator connected together by an annular protrusion located within a recess. The rotor has a slinger located on the housing side of the rotor/stator interface. The stator has a plurality of alternating annular ridges and grooves which, together with an axial groove, direct fluid back into the housing to which the stator is attached. One of the ridges is positioned within the slinger recess, such that fluid traveling along a shaft to which the rotor is attached is slung off the slinger into the annular groove.

Abstract: In a machine in which a rotating shaft extends into a housing through a gland, the shaft being rotated in only one direction, the housing containing lubricant, the gland including an opening of substantial length with an annular radially inwardly extending flange at an axially inner end, an anti-leakage device comprises a sleeve mounted on and around the shaft closely but to permit rotation of the shaft, and mounted against rotation in the gland opening. The sleeve has an annular seat, in which an O-ring is mounted, and a helical groove in a surface contiguous the shaft, the groove being formed in a direction with respect to the direction of rotation of the shaft to move fluid in a direction toward the housing. The clearances between the shaft and housing when the shaft is not rotating are such as to prevent the lubricant in the housing from leaking out.

Abstract: A cavity in the housing, which confines the seal therewithin, has an annular wall surface which is modified to direct liquid from the cavity towards the impeller. In one embodiment, the wall surface has a helical land formed therein. In another embodiment, a helical-land forming insert is set within the cavity and in engagement with the wall surface.