Rotary kinetic fluid motors or pumps – With lubricating – sealing – packing or bearing means having... – For shaft sealing – packing – lubricating or bearing means
Patent
1997-12-19
1999-11-16
Ryznic, John E.
Rotary kinetic fluid motors or pumps
With lubricating, sealing, packing or bearing means having...
For shaft sealing, packing, lubricating or bearing means
415113, 384110, F16J 1540
Patent
active
059846275
DESCRIPTION:
BRIEF SUMMARY
This invention relates to seals and bearings for rotary shafts, and is particularly suitable for use in motor-driven centrifugal pumps.
BACKGROUND OF THE INVENTION
This invention relates to developments of the technology described in patent publication number WO-95/35457 also U.S. Pat. No. 5,827,042.
The technology provides a combined seal and bearing assembly apparatus, comprising a stator and rotor adapted for rotation about an axis. The apparatus may be installed in place of the stuffing box of a centrifugal pump.
The rotor and the stator components are formed with complementary bearing-surfaces, which are so arranged as to sweep each other in a hydro-dynamic-bearing relationship, over an area termed the bearing area. One of the bearing-surfaces is formed with a groove, which extends in a spiral configuration along and around the bearing-surface, over the bearing area. The spiral-groove comprises several turns extending over the bearing-surface, the arrangement thereof being such as to leave lands of substantial width between adjacent turns of the spiral-groove. The spiral-groove has an entry-mouth and an exit-mouth.
The apparatus is so structured as to define an entry-chamber and an exit-chamber, being chambers which are in fluid-conveying-communication with the entry-mouth and the exit-mouth respectively, and the apparatus includes a means for conveying a barrier-liquid into the entry-chamber, and away from the exit-chamber. When the apparatus is driven in rotation, the barrier-liquid flows along the spiral-groove from the entry-mouth to the exit-mouth.
The apparatus is so structured that the fit of the bearing-surfaces is a tight running clearance, the clearance or gap between the surfaces being small enough, and the land width between the turns being wide enough, to ensure the establishment and continuance of a hydro-dynamic film between the bearing-surfaces. The bearing surfaces are conically tapered, and either the rotor or the stator is made axially movable into and out of the taper.
SUMMARY OF THE INVENTION
In the tapered-sleeve-with-spiral-groove type of rotary interaction device, or seal/bearing apparatus, as shown in WO-95/35457, a single tapered sleeve interface was illustrated. The present invention provides a folded tapered sleeve, in which the axial length of the seal/bearing assembly is small, but the aggregate interface area is large. The manner in which the folded tapered interface can be put into practice, and utilised to advantage, is explained below.
DESCRIPTION OF PREFERRED EMBODIMENTS
By way of further explanation of the invention, exemplary embodiments of the invention will now be described with reference to the accompanying drawings, in which:
FIG. 1 is a cross-section of a rotary impeller pump, having a folded tapered sleeve arrangement which embodies the invention;
FIG. 1a is a cross-sectional view of the folded sleeve components of the pump of FIG. 1;
FIG. 2 is a cross-section of another rotary impeller pump, having a folded tapered sleeve arrangement which embodies the invention;
FIG. 2a is a close-up of an area of FIG. 2;
FIG. 3 is a cross-section of another rotary impeller pump, having a folded tapered sleeve arrangement which embodies the invention;
FIG. 3a is a cross-sectional view of the folded sleeve components of the pump of FIG. 3;
FIG. 4 is a cross-section of another rotary impeller pump, having a folded tapered sleeve arrangement which embodies the invention;
FIG. 5 is a cross-sectional view of a compressor, having bearings in the form of a folded tapered sleeve arrangement which embodies the invention;
FIG. 6 is a cross-sectional view of a portion of another compressor which embodies the invention.
The apparatuses shown in the accompanying drawings and described below are examples which embody the invention. It should be noted that the scope of the invention is defined by the accompanying claims, and not necessarily by specific features of exemplary embodiments.
FIG. 1 shows a rotary impeller pump, in which the impeller 20 is mounted on a drive-shaft 23.
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A.W. Chesterton Co.
Ryznic John E.
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