US 4,376,540 AGranted

Gas seal for shafts with a compensating ring

AssigneeM.A.N. Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft

InventorsJoachim Kotzur, Manfred Heinen

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Abstract

A gas seal for a rotatable shaft of a housing which comprises, a first rotatable dimensionally stable seal ring connected to the shaft. A diaphragm is connected to the housing which exerts an axial bias on a second rotatable seal ring. The bias of the diaphragm provides a gap space between the rotatable and fixed seal ring which is supplied with a sealing gas. The material of the fixed ring is different from that of the diaphragm. A compensating ring is connected unilaterally to the fixed ring and of a material at least partly the same as the fixed ring. A slide seat is defined between the compensating ring and the fixed ring to permit axial movement of at least a part of the compensating ring. This part is connected in turn to the diaphragm so that stress free transmission of axial thrust is provided between the seal ring and the diaphragm.

Claims9

Dependent claims

A gas seal for a shaft rotatable in a housing comprising:

a dimensionally stable rotating seal ring connected to the shaft for rotation therewith;
a diaphragm connected to the housing for exerting an axial bias with respect to the rotating seal ring;
a non-rotating seal ring connected to the diaphragm and defining with the rotating seal ring a radial seal gap, said non-rotating seal ring made of a material different from that of said diaphragm;
gas supply means connected to said non-rotatable seal ring for supplying gas to the seal gap;
and
a compensating ring made at least in part of the same material as said non-rotating seal ring, connected on one side and at one radial end to said non-rotating seal ring and at an opposite side, and at a place spaced from said one radial end to said diaphragm, said compensating ring having a slide seat surface engaged on a surface of said non-rotating ring spaced from said one radial end.

3 more elements

Dependencies are inferred from the claim text.