Mechanical seal with bellows element

Abstract

The invention relates to a mechanical sealing device, which comprises a rotary slip ring (11) and a fixed slip ring (12), a sealing gap (13) is defined between the rotary slip ring (11) and the fixed slip ring (12), and corrugated Tube unit (2) with bellows element (3) and intermediate disc (4). The bellows element (3) has a first connection region (31), a second connection region (32) and a bellows middle region (33). The bellows element (3) is made of elastomeric material and provides the connection between the rotating slip ring (11) and the rotating structural part (10). The intermediate disc (4) is arranged between the bellows element (3) and the rotary slip ring (11), the intermediate disc (4) has at least one slot (47), and the slot (47) has a slot smaller than the slot length (S) width (B). The slot ( 47 ) is closed on one side, so that the connection area ( 49 ) remains in the area of ​​the slot ( 47 ) of the intermediate disk ( 4 ).

Description

technical field [0001] The present invention relates to a mechanical seal arrangement having a bellows element having improved axial readjustment during operation. Background technique [0002] Mechanical seals with bellows elements are known from various embodiments from the prior art. In principle, the bellows element can be an elastomeric bellows or a metal bellows which particularly facilitates the axial readjustment of the mechanical seal in the event of eg a shaft misalignment. It has been found that, especially when elastomeric bellows are used, this can lead to a deteriorated readjustment performance of the mechanical seal. On the one hand, this is due to the fact that, due to the softness of the elastomeric material, the support shoulders of the bellows element may stick to the shaft surface etc. and thus cannot follow the axial readjustment quickly enough. This is more likely to happen if, for example, there is contamination on the shaft surface which may result ...

AI Technical Summary

Problems solved by technology

This can lead to complete obstruction of the axial mobility of the bellows element after a longer operation of the mechanical seal

Furthermore, it has been found that even in the absence of contaminants, the support shoulder of the elastomeric bellows can lead to an impediment to the readjustment performance related to the vibrations that occur during operation due to the increased friction between the elastomeric material and the shaft

The above problems can lead to increased leakage at the seal gap during operation and even failure of the mechanical seal

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