Mechanical seal arrangement with minimal leakage

Patent metadata

Field	Value
Publication number	US-11028926-B2
Application number	US-201716464043-A
Country	US
Kind code	B2
Filing date	Sep 26, 2017
Priority date	Nov 29, 2016
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

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.

First claim

The invention claimed is:

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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. Mechanical seal arrangement according to claim 1 , wherein the sealing edge is circular.

8. Mechanical seal arrangement according to claim 1 , wherein the sealing edge is wave-shaped, in particular sine-shaped.

9. Mechanical seal arrangement according to claim 1 , wherein the sealing edge is crenellation-shaped or meander-shaped.

10. 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.

11. Mechanical seal arrangement according to claim 1 , wherein the sealing edge has a varying width (B 1 , B 2 ).

12. 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.

13. Mechanical seal arrangement according to claim 1 , wherein the second sliding surface has support structures at the base area.

14. Mechanical seal arrangement according to claim 1 , further comprising a second sealing edge at the second sliding surface.

15. Mechanical seal arrangement according to claim 13 , wherein the second sealing edge has a second height (H 2 ) that is smaller than a first height (H 1 ) of the first sealing edge.

16. 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.

17. 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.

18. 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.

19. 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.

Assignees

• Eagleburgmann Germany Gmbh

Inventors

• Otschik Joachim
• Schrufer Andreas
• Thelke Jorg Thomas
• Schicktanz Rudolf
• Labatut-Stolle Christine
• Simic Aleksandar
• Reitberger Joachim

Classifications

• F16J15/3496 Primary

  use of special materials · CPC title

• F16J15/3408

  at least one ring having an uneven slipping surface · CPC title