Mechanical face seal device

Details Mechanical face seal device Mechanical face seal device

2000-01-24

2001-04-24

Knight, Anthony (Department: 3626)

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

C277S391000, C277S392000, C277S393000

Reexamination Certificate

active

06220601

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the invention
The invention relates to a mechanical face seal device, and especially to such a device having a bellows member of resilient material for establishing an axially resilient connection between one annular seal member of a pair of co-operating annular seal members and a rotary component.
2. Description of the Prior Art
In a bellows assembly such as arc known e.g. from DE-A-34 12 594, and pages 22-23 of the Burgmann Lexikon, ABC der Gleitringdichtung, 1988, published by the author, a bellows member acts as a secondary dynamic seal thus making the construction of the mechanical face seal device less complicated and consequently more economical. Such mechanical face seal devices are unaffected by the effects of dirt and aging. A stiff support member may abut a face of a large rotary annular seal member for preventing the bellows member from penetrating a boring of the rotary annular seal member under axial forces acting thereon during operation. It is further known from U.S. Pat. No. 3 020 052 that a bellows assembly of a mechanical face seal device having a similar large rotary annular seal member may comprise a driving housing connected with a bellows member.
SUMMARY OF THE INVENTION
An object of the invention is to provide a improved mechanical facc seal device of the type referred to above. A further object of the invention is to provide such a mechanical face seal device having minimized dimensions, especially its radial dimensions. Another object is to provide such a mechanical face seal device which has uncomplicated, highly reliable annular seal members suitable for economical mass production.
The mechanical face seal device in accordance with the invention includes a pair of co-operating annular seal members, of which one is adapted to be mounted in a non-rotational relationship on a stationary component whilst the other is provided for common rotation with a rotary component. A bellows assembly comprises a bellows member of resilient material having axially spaced mounting portions interconnected with each other by an intermediate foldable portion. One of said mounting portions can be fixed relative to the rotary component whilst the other is in torque transferring relationship with the rotary annular seal member. A biasing means serves for mechanically urging the rotary annular seal member against the stationary annular seal member. The mechanical face seal device of the invention further has an essentially stiff support member having a predetermined radial dimension for axially supporting the rotary annular seal member. By providing a stiff support member on which the rotary annular seal member can abut when in use, the annular seal member is prevented from coming into destructive or damaging engagement with the bellows member of resilient material due to axial forces effective on the mechanical face seal device, even though the radial dimension of the annular seal member may be minimal. The annular seal member is also prevented, in particular, from penetrating a boring in a driving housing which comprises axially spaced force transferring portions, of which one is in force transferring relationship with the mounting portion of the bellows member at the annular seal member side, whilst the other one is in force transferring relationship with the mounting portion at the rotary component side, whereby the force transferring portion facing the mounting portion at the rotary component side may have an internal radial dimension which is smaller than the predetermined external radial dimension of the support member. As a result of these measures no particular demands are made in regard to the configuration of the annular seal member so that not only may it have minimum radial dimensions but it can also be of simple cross-sectional shape so as to facilitate manufacture. Other advantageous embodiments of the invention and the effects and advantages deriving thereof will become apparent from the claims and the subsequent explanation.


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