# US 11,028,926 B2 · Mechanical seal arrangement with minimal leakage > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,926 B2 - Document ID: US11028926B2 - Status: Granted - Kind: B2 - Application number: 16/464,043 - Filed: 2017-09-26 - Published: 2019-12-19 - Granted: 2021-06-08 - Earliest claimed: 2016-11-29 - Assignees: EagleBurgmann Germany GmbH & Co. KG - Applicants: EagleBurgmann Germany GmbH & Co. KG - Inventors: Joachim Otschik; Andreas Schrufer; Jorg Thomas Thelke; Rudolf Schicktanz; Christine Labatut-Stolle; Aleksandar Simic; Joachim Reitberger - Web page: https://patentgrep.com/patent/US11028926B2 ## CPC - F16J 15/3496: {use of special materials} - F16J 15/3408: {at least one ring having an uneven slipping surface} - F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS ## Abstract 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 μm, 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. ## Claims ### Claim 1 Mechanical seal arrangement, comprising: a mechanical seal with a rotating slide ring and a stationary slide ring, wherein one of the two slide rings has a first sliding surface, wherein the other of the two slide rings has a second sliding surface with a circumferentially closed sealing edge, which projects from in a direction towards the first sliding surface by a height (H), wherein the sealing edge has a width which is in an area between 10 to 500 μm, wherein at least one pre-stressing element pre-stresses the slide rings against each other, wherein the second sliding surface and the sealing edge at the second sliding surface have a diamond coating, or wherein the second sliding surface and the sealing edge at the second sliding surface have a cubic boron nitride coating, wherein a width of the sealing edge is smaller than a width of the first sliding surface, and contacts only a portion of the first sliding surface, and wherein between the first sliding surface and the second sliding surface a OH ion donor and/or a H+ ion donor is present. ### Claim 2 (depends on 1) Mechanical seal arrangement according to claim 1, wherein the sealing edge is made completely of diamond or wherein the sealing edge is made completely of cubic boron nitride. ### Claim 3 (depends on 1) Mechanical seal arrangement according to claim 1, wherein the width (B) of the sealing edge is smaller than or equal to 60 μm and/or the height (H) of the sealing edge is smaller than or equal to 5 μm. ### Claim 4 (depends on 1) Mechanical seal arrangement according to claim 1, wherein the first sliding surface has a medium roughness of smaller than or equal to 0.02 μm. ### Claim 5 (depends on 1) Mechanical seal arrangement according to claim 1, wherein a load factor (k) of the slide ring seal is in a range of between 0 to 0.3. ### Claim 6 (depends on 1) Mechanical seal arrangement according to claim 1, wherein the first sliding surface has a circular flatness of smaller than or equal to 5 μm, in particular smaller than or equal to 0.5 μm. ### Claim 7 (depends on 1) Mechanical seal arrangement according to claim 1, wherein the sealing edge is circular. ### Claim 8 (depends on 1) Mechanical seal arrangement according to claim 1, wherein the sealing edge is wave-shaped, in particular sine-shaped. ### Claim 9 (depends on 1) Mechanical seal arrangement according to claim 1, wherein the sealing edge is crenellation-shaped or meander-shaped. ### Claim 10 (depends on 9) Mechanical seal arrangement according to claim 9, wherein die crenellation-shaped or meander-shaped sealing edge has first pockets at a radially outwardly directed side and has second pockets at a radially inwardly directed side, wherein a circumferential length of the first pockets differs from a circumferential length of the second pockets. ### Claim 11 (depends on 1) Mechanical seal arrangement according to claim 1, wherein the sealing edge has a varying width (B1, B2). ### Claim 12 (depends on 1) Mechanical seal arrangement according to claim 1, wherein the sealing edge has a ratio of the height (H) to the width (B) in a range of 0.002 to 2. ### Claim 13 (depends on 1) Mechanical seal arrangement according to claim 1, wherein the second sliding surface has support structures at the base area. ### Claim 14 (depends on 1) Mechanical seal arrangement according to claim 1, further comprising a second sealing edge at the second sliding surface. ### Claim 15 (depends on 13) Mechanical seal arrangement according to claim 13, wherein the second sealing edge has a second height (H2) that is smaller than a first height (H1) of the first sealing edge. ### Claim 16 (depends on 1) Mechanical seal arrangement according to claim 1, wherein the OH ion donor and/or the H+ ion donor is a liquid or a gas or a gas-liquid s mixture. ### Claim 17 (depends on 15) Mechanical seal arrangement according to claim 15, wherein the OH ion donor and/or the H+ ion donor is water or has a content of water or is water vapor or has a content of water vapor. ### Claim 18 (depends on 1) Mechanical seal arrangement according to claim 1, wherein the second sliding surface has a first tapering area, a second tapering area and has a flat area, wherein the flat area is arranged between the first and second tapering area, and wherein the sealing edge is arranged at the flat area. ### Claim 19 (depends on 18) Mechanical seal arrangement according to claim 18, wherein a width of the first and second tapering area in the radial direction is equal to a width of the flat area and/or wherein the first sliding surface has a first tapering area, a second tapering area and a flat area that is arranged between the two tapering areas.