Seal for a joint or juncture – Seal between relatively movable parts – Diverse and distinct dynamic seals
Patent
1997-04-28
1999-10-05
Reichard, Lynne
Seal for a joint or juncture
Seal between relatively movable parts
Diverse and distinct dynamic seals
277351, 277411, F16J 15447
Patent
active
059611243
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a sealing system disposed in the aperture through a housing wall, for an essentially vertical shaft with an active sealing element which is disposed between a structural part rotating with the shaft and a structural part stationary on a housing, with the housing wall separating an upper, oil-free volume from a lower oil-containing volume.
Sealing systems of this type are used for example in a vacuum pump such as is described in DE-A-42 33 142. In the case of vacuum pumps of this type the elimination of the heat generated in the rotating system presents problems. It develops, for one, due to the compression work of the rotors in their suction chambers and, for another, through the heat due to friction of the contact seals (radial shaft sealing) used.
SUMMARY OF THE INVENTION
The present invention addresses the problem of creating a sealing system of the above cited type in which the elimination of heat is significantly improved.
This problem is solved according to the invention thereby that through the sealing system flows oil and that the structural part rotating with the shaft as well as a further structural part stationary on the housing form a gap through which the oil flows. The oil flowing through this gap absorbs, for one, heat from the structural part rotating with the shaft and eliminates it. For another, the oil establishes a heat contact between the rotating structural part and the structural part stationary on the housing so that via the structural part stationary on the housing, and thus via the housing, the heat is eliminated.
The structural part and the further structural part stationary on the housing are usefully realized in the form of a labyrinth in their regions facing one another for the purpose of extending the gap through which the oil flows. The cooling effect is thereby enhanced. In addition, a long gap of this type has the effect of a choke. This maintains excess pressure and thus continuous flooding without bubble formation at the oil inlet.
The active sealing element can be a contact sealing (shaft seal, collar sealing or the like) or a threaded shaft seal. Especially useful is a combination comprising a primary contact seal and a second threaded shaft seal as auxiliary sealing.
The above, and other objects, features and advantages of the present invention will become apparent from the following description read in conjunction with the accompanying drawings, in which like reference numerals designate the same elements.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a sectional view of a sealing system with a threaded shaft seal according to an embodiment of the invention.
FIG. 1a shows a sectional view of a sealing system with a threaded shaft seal according to a variation of the embodiment of FIG. 1.
FIG. 2 shows a sectional view of a sealing system with a threaded shaft seal according to an embodiment of the invention.
FIG. 3 shows a sectional view of a sealing system with a threaded shaft seal according to an embodiment of the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In all Figures the housing wall is denoted by 1, an aperture provided in the housing wall 1 by 2, a vertical shaft penetrating the aperture 2 by 3, and a sealing system sealing the shaft 3 against the aperture 2 in general by 4. The housing wall 1 separates for example in vacuum pumps an upper oil-free volume (suction chamber with low pressures, vacuum) from a lower oil-containing volume (gearing chamber, in which pressures exceeding the atmospheric pressure can occur). In the embodiment examples depicted the shaft 3 is supported in the aperture 2. Bearings disposed underneath the sealing system 4 are denoted by 5.
The sealing system 4 comprises a structural part 7 rotating with the shaft. Furthermore, two structural parts 8 and 9 stationary on the housing are present. The first structural part 8 (sealing structural part 8) encompasses the rotating structural part 7. The second structural part 9 stationary on the housing forms togeth
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Bochna David E.
Leybold Aktiengesellschaft
Reichard Lynne
LandOfFree
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