Eagleburgmann Germany Gmbh & Co. Kg

Feodor Burgmann Dichtungswerke Gmbh & Co.

Burgmann Industries Gmbh & Co. Kg

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Andreas Schrüfer

Günther Lederer

Joachim Otschik

Armin Laxander

Peter Dröscher

Klaus Lang

Andreas Fesl

Dieter Ziegenbein

Rudolf Schicktanz

Petia Philippi

Reinhard Svejkovsky

Ferdinand Werdecker

Peter Droscher

Rolf Johannes

Lothar Schäfer

Jorg Thomas Thelke

Josef Nosowicz

Rudolf Kollinger

Markus Armgardt

Markus Höfer

Berthold Vogel

Jörg Thelke

Wolfgang Berger

Georg Steigenberger

Josef Strobl

Carsten Scholz

Michael Riedl

Joachim Reitberger

Peter Waidner

Andreas Schopf

Walter Ittner

Manfred Oppler

Thomas Holzapfel

Giuliano Rossi

Andreas Kretschmer

Christine Labatut-Stolle

Aleksandar Simic

Peter Radulescu

The invention relates to a gas-lubricated mechanical seal arrangement using a gaseous fluid as a barrier medium, comprising a mechanical seal comprising a rotating slide ring () and a stationary slide ring () defining a seal gap () therebetween, a biasing means () biasing the stationary slide ring () towards the rotating slide ring (), a fluid space (), into which the gaseous fluid can be introduced, a first slide ring carrier () for retaining the rotating slide ring (), the first slide ring carrier () having a first axial surface (), a second slide ring carrier () for retaining the stationary slide ring (), the second slide ring carrier () having a second axial surface (), the second slide ring () and the stationary slide ring () being arranged together on a displacement surface () so as to be displaceable in the axial direction (X-X), an axial gap (), which is limited by the first axial surface () and the second axial surface (), and an antechamber () which is formed at the sealing gap () of the mechanical seal and which is connected to the fluid space () via the axial gap ().

Gas-lubricated mechanical seal having improved soiling protection

The invention relates to a mechanical seal assembly comprising a mechanical seal with a rotating slide ring and a stationary slide ring, wherein one of the two slide rings has a first slide surface, wherein the other of the two slide rings has a second slide surface with a circumferentially closed sealing blade which protrudes from a bottom region of the second slide surface in the direction of the first slide surface by a height (H), wherein the sealing blade has a width (B) in a range of between 10 and 500 &#x3bc;m, wherein at least one pre-tensioning element braces the slide rings against each other, wherein the second slide surface and the sealing blade on the second slide surface have a diamond coating.

Mechanical seal arrangement with minimal leakage

The invention relates to a mechanical seal arrangement comprising: a rotating slide ring () having a first slide surface and a stationary slide ring () with a second slide surface which between them define a sealing gap, wherein the first and second slide surfaces have different hardnesses, wherein the harder slide surface has a diamond coating () and the softer slide surface is produced from carbon composite material, and wherein an average initial roughness R(of the diamond coating) is less than an average initial roughness Rof the slide surface made from carbon composite material.

Mechanical seal arrangement having sliding surfaces of different hardness

The present invention refers to a seal ring for a mechanical seal, comprising: a base body () with a diamond layer () which is applied to the base body () and configured as a sliding surface, wherein the diamond layer () has a thickness (D) which is less than or equal to 4 &#x3bc;m, particularly less than or equal to 3 &#x3bc;m, particularly less than or equal to 2 &#x3bc;m, particularly preferably about 1 &#x3bc;m, and wherein the base body () is without fissures or only comprises fissures that have a maximum longitudinal extension (L) on a surface of the base body () or in the base body () that is less than or equal to 5 &#x3bc;m.

Low-friction seal ring with inexpensive diamond coating

A slide ring seal arrangement comprises a rotationally fixed slide ring () and a slide ring (), which is provided for rotating together with a rotating component, these slide rings each being held in a loose seat and interacting, in, in essence, radially oriented sealing surfaces, which are prestressed with a main prestressing force while in contact with one another. Each slide ring, on its front face that faces away from the sealing surface, is axially supported on a supporting part () via an annular bearing surface () provided between the respective supporting part and the adjacent front face of the respective slide ring. A load ratio (d&#x2212;d)/(d&#x2212;d) of =2.0, preferably between 0.8 and 2.0, preferably no greater than between 1.0 and 1.5, more preferably approximately 1.3 is maintained on the bearing surface (). The measurement (d&#x2212;d) of each bearing surface () is equal to =10 mm, preferably between 0.2 and 2.0, preferably no more than approximately 0.6 mm.

Slide ring seal arrangement

The present invention refers to an apparatus for rotationally fixing a seal ring () of a mechanical seal assembly retained at a mounting component () to be axially movable, comprising a force transmitting ring () retained at the mounting component to be axially movable and a rotation prevention device comprising at least one first engaging member () configured to engage with the mounting component and the force transmitting ring in a form-fit manner and at least one second engaging member () configured to engage with the force transmitting ring and the seal ring in a form-fit manner, the first engaging member being arranged circumferentially offset with respect to the second engaging member, characterized in that the engaging members () protrude axially from the force transmitting ring () or the seal ring () toward the respectively other component (seal ring or force transmitting ring) and are configured to be received in axial recesses () provided in the respectively other component with a play.

Apparatus for rotationally fixing a seal ring of a mechanical seal assembly axially movably retained at a mounting component

A mechanical seal assembly including at least one pair of co-operating seal rings, one of which is provided for common rotation with a rotating component and the other of which is provided rotationally fixed at a stationary component. One of the seal rings is axially movable and axially biased with a biasing force against the other seal ring, the biasing force being transmittable through a force transmitting ring to the respective seal ring, in order to bias facing sliding surfaces of the seal rings, between which a sealing gap is formed during operation, in a mutual sealing engagement, and a secondary sealing assembly provided at the force transmitting ring for sealing the axially movable seal ring with respect to at least one circumferential guiding surface of a guiding component guiding the movement of the seal ring and the force transmitting ring.

Mechanical seal assembly

A secondary sealing element comprises a base body () made of a synthetic material and comprising a base portion () and a seal portion () which each comprise coaxially aligned, axially adjacent through bores () for the passage of a component, and an annular disc element () accommodated in the base portion and comprising a through bore () coaxially aligned with the through bores in the base and seal portions and being made of a material which differs from that of the base body. In the unloaded state, the through bore () of the annular disc element () has a radial dimension d which is greater than that Dof the through bore () in the seal portion () and smaller than that Din the base portion () of the base body (). The annular disc element consists of a carbon material. An important field of application for the secondary sealing element is that of mechanical face seals for sealing relatively moveable components.

Secondary sealing element

A mechanical face seal assembly for sealing a rotating member with respect to a stationary member comprises at least a pair of cooperating annular sealing elements, of which one is mountable in a non-rotating manner with respect to the stationary member and the other for common rotation with the rotating member. Between the rotating member and the non-rotating sealing element an annular space is defined, the radial dimension of which varies between a region of minimum radial dimension and a region of maximum radial dimension, which are offset circumferentially to each other. Inlet means for introducing a buffer liquid into the annular space at or near to the region having a maximum radial dimension and outlet means for discharging said buffer liquid from said annular space at or near to the region having a minimum radial dimension are provided. At least one delivery-promoting recess is formed in a portion of the rotating member oriented axially to said annular space for promoting a flow of the buffer liquid along the annular space from the inlet to the outlet means and for receiving gas bubbles released from the buffer liquid when pressurized in the annular space.

Mechanical face seal assembly

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Wolfratshausen, Germany

Andreas Schrüfer