Abstract:
Die Erfindung betrifft eine Anordnung (AR), insbesondere Turbomaschine (TM), umfassend - eine Welle (SH), die sich entlang einer Achse (X) erstreckt, - eine Wellendichtungseinrichtung (SHS) zur Abdichtung eines Ringspaltes (GP) zwischen der Welle (SH) und einem Stator (STT) von einem Prozessfluidraum (PFC) zur Umgebung (AMB), - wobei die Wellendichtungseinrichtung (SHS) eine Ferrofluidwellendichtung (FFS) aufweist, wobei seitens des Prozessfluidraumes (PFC) die Wellendichtungseinrichtung neben der Ferrofluidwellendichtung (FFS) eine Zusatzwellendichtung (SHS1) umfasst, wobei die Ferrofluidwellendichtung (FFS) an dem Ringspalt (GP) axial zwischen der ersten Wellendichtung und der Umgebung (AMB) angeordnet ist, wobei an dem Ringspalt (GP) axial zwischen der Zusatzwellendichtung (SHS1) und der Ferrofluidwellendichtung (FFS) eine Drucksenke (SUC) vorgesehen ist.
Abstract:
A magnetic rotary seal with improved drain back is provided, comprising a housing adapted to matingly engage a fixed opening, wherein the housing includes an annular retaining member. A stator is positioned within the housing, wherein the stator includes a first resilient sealing member adapted to sealingly contact the housing, and a first frictional sealing face. A rotor is positioned between the annular retaining member of the housing and the stator, wherein the rotor includes a second resilient sealing member adapted to sealingly contact a shaft, and a second frictional sealing face. Magnets are operatively positioned between the stator and the rotor urging engagement of the first frictional sealing face of the stator with the second frictional sealing face of the rotor. The housing further includes an annular channel for receiving lubricating fluids from within the seal, and a drain port in fluidic communication with the channel. The annular retaining member includes one or more expulsion ports formed therein to permit lubricating fluids to move away from the rotor and into the channel during operation of the seal.
Abstract:
A segment of a structure mitigates flow of fluid therethrough. In one embodiment the segment includes an opening for the fluid flow and the modified structure may include a ferromagnetic wall defining the opening and a plurality of permanently magnetized particles. Some of the permanently magnetized particles are attached to the wall by magnetic forces. A system is also provided for injecting magnetic particles into a cavity to impede movement of fluid through the cavity. A method is also described for mitigating a flow of fluid through an opening in a wall. In one embodiment, the method includes positioning a plurality of first magnetic particles along the wall and about the opening and attaching a plurality of second magnetic particles to the first magnetic particles wherein some of the second magnetic particles collectively extend across the opening to cover the opening.
Abstract:
The present disclosure describes a magnetic fluid sealing device (10) having a shaft (20) centered with respect to a magnetic structure (35) and rolling element bearing (50), as well as a method for centering the shaft in the device. A compressible ring (70) located in a groove on the shaft is used to partially fill the gap between the shaft and the rolling element bearing and to make contact with the rolling element bearing. The compressible ring (70) aligns and centers the shaft with the rolling element bearing (50). A liquid locking material (75) is added to the gap and hardened to couple the shaft and compressible ring to the rolling element bearing. An alternative self-alignment mechanism is also disclosed.
Abstract:
In a motor having a fixed shaft and a ball bearing with inner and outer races mounted near one end of the shaft, a magnetic seal is provided which is supported from a seal support which is integrated with or adhesively attached to the back iron which rotates with the hub, the seal magnetic pole pieces extending around the shaft and holding ferrofluid between the ends of the pole pieces extending around the shaft and holding ferrofluid between the ends of the pole pieces and the shaft. A vacuum press holds the shield piece and heats the shield to a temperature so that the inner radius of the washer-shaped seal piece is larger than the outer diameter of the shaft. The press then lowers the shield over the outside diameter of the shaft; the shield is positioned by providing a positioning surface on the vacuum press which butts against the end of the shaft, with the vacuum holding portion of the press extending lower than this alignment surface to place the shield on the outside of the shaft. As the shield cools, it presses against the outside surface of the shaft and is fixed in place. The seal support includes a catcher recess which faces the shaft and is in a position to catch any stray metal particles.
Abstract:
The invention relates to a device for sealing an annular gap. The aim of the invention is to provide a device for sealing an annular gap by means of a magnetic liquid. The inventive device can seal two contactless, axially adjacent pipe ends in such a way that no exchange takes place between the fluid medium in the pipes and the proximity and that the magnetic liquid does not mix with the fluid medium and that the pipes can be moved and rotated against each other involving little friction. To this end, the pipe ends forming an annular gap are connected to the poles of a magnetic arrangement in a magnetically conducting manner. Said magnetic arrangement is fixed around the annular gap area. A magnetic liquid is arranged in the annular gap.
Abstract:
The aim of the invention is to provide a device for axially delivering fluidic media such that said device exhibits a low-friction sealing, which does not generate any turbulences, between the stationary tubular hollow body and the rotating tubular delivering part, and with which sealants cannot be absorbed by the fluidic medium to be delivered. To these ends, the annular gaps between the tubular stationary hollow bodies and the rotating delivering part are provided with a magnetic fluid seal.