DE29822515U1 - High-pressure rotor seal for high-speed waves - Google Patents

Description

Hunger DFE - al

High pressure rotor seal for speeding shafts

The present invention relates to a seal for rotating/pivoting machine parts, which has a contacting sliding/sealing surface (1).

Such seals are already known and in use.

Sealing moving machine parts is necessary to prevent loss of the operating medium or the medium to be pumped and to avoid operational disruptions or contamination of the peripherals.

Previous sealing elements were either suitable for high peripheral speeds/rotational speeds but could only be used at low media pressures or were suitable for higher media pressures but could only be used at low peripheral speeds.

The causes of failure were often overheating and high wear of the sealing element due to dry running, tearing of the lubricating film or overheating due to frictional heat.

The object of the present invention is therefore to ensure a defined lubricating film in the sliding/sealing surface (1) and to generate cooling of the running surface by exchanging the operating medium used as lubricant (2).

This object is achieved according to the invention in that grooves (4) are provided in the sliding surface of the sealing element (3) in the axial direction, which preferably have a wedge-shaped, preferably rounded contour and thus run out in a rounded transition. This prevents the operating medium from entering

(2) over a defined area within a defined volume.

-2-

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The V-shaped surface (5) of the recess resulting from the shape of the counter-running surface creates a suction or pushing effect during the rotational movement, through which the cooling/lubricating medium is drawn into or pushed out of the wedge-shaped recess.

This means that the medium (2) is exchanged in the cooling/lubricating area, through which the frictional heat generated and transferred to the medium is dissipated. The keyways (4) are distributed over the circumference of the sliding surface and thus ensure that the lubricating film produced does not break off. The keyways (4) can preferably be provided radially offset on both sides in order to prevent the medium (2) from escaping under the seal (3). The sliding ring (3) of the sealing element is preferably made from a PTFE compound.

The elastomer ring (6) used, which is preferably designed as a round or O-ring and which presses the sliding ring (3) lightly against the counter-rotating partner and thereby creates a sealing effect in the pressure-free state, is preferably made of rubber or elastomer. As the media pressure increases, the elastomer ring (6) is axially compressed by the media (2) as with conventional sliding ring O-ring seals and presses the sliding ring (3) more strongly in line with the system pressure.

The sealing element can be designed to seal internally (sliding surface on the inner diameter) or externally (sliding surface on the outer diameter). Accordingly, the sliding ring (3) is placed inside the elastomer ring (6) or outside on the elastomer ring (6).

Fig. 1 shows the sealing element in section

Detail 1 shows the sealing element in its installation space
Detail 2 shows the inflow / outflow effect of the lubricating /

Cooling medium in the wedge gap
Detail 3 shows the offset arrangement of the keyways on the

Example of an internal sealing gasket

Claims (2)

Hunger DFE GmbH ■ PO Box 58 60 ■ 97008 Würzburg HUNGER Seals A COMPANY OF THE HUNGER GROUP German Patent Office 80297 Munich Sealing and guide elements Plastics technology Internet: www.hunger-dichtungen.de Email: info@hunger-dichtungen.de Your sign Your message from Our sign date Hunger DFE-al 02.12.1998 Protection claims "High-pressure rotor seal for rotating shafts" 2 1. Rotor seal for sealing rotating/pivoting machine parts, which has a running surface for the rotating/pivoting counter-running surface, characterized in that grooves are provided in the axial direction, 5 which generate cooling and lubrication of the sealing element during operation and enable an exchange of the cooling/lubrication volume. 2. Rotor seal according to claim 1, characterized in that the cooling/lubricating medium is the operating medium. -A- Street address
Alfred-Nobel-Strasse 26
D-97080 Wurzburg Telephone (09 31) 9 00 97-0 Fax (09 31) 900 97-30 Telex 6 8 834 Hypo-Bank Würzburg (bank code 790 203 25) 1 490 347 387
City. Sparkasse Würzburg (bank code 790 50000) 42 515
BfG Würzburg (bank code 790101 11) 11 18 79 70 00
Postbank Nuremberg (bank code 760 100 85) 49 89-853 Managing Director: Ingrid Hunger Company headquarters: Würzburg Registration court: District Court of Würzburg HRB 971