Mechanical seal with improved groove arrangement
The invention relates to a mechanical seal comprising a rotating slide ring and a stationary slide ring defining a sealing gap therebetween, one of the slide rings having at least a first row of a plurality of first grooves with a foot region on a first radius and a head region on a second radius wherein a second circumferential sliding region is provided between the head regions of the radially outermost row of grooves of the slide ring and an outer radial edge of the slide ring, the other of the slide rings having at least a second row of a plurality of second grooves with a foot region at a third radius and a head region at a fourth radius wherein a second circumferential sliding region is provided between the head regions of the radially outermost row of grooves of the slide ring and an external radial edge of the slide ring, wherein the first radius is smaller than the third radius, and wherein the second radius is smaller than the fourth radius.
1. A mechanical seal comprising:
a rotating slide ring and a stationary slide ring defining a sealing gap therebetween,
wherein one of the slide rings includes at least a first row of a plurality of first grooves each having a foot region on a first radius and a head region on a second radius, a first circumferential sliding region being provided between head regions of a radially outermost row of grooves of the slide ring and an external radial edge of the slide ring,
the other of the slide rings having at least a second row of a plurality of second grooves each with a foot region on a third radius and a head region on a fourth radius, a second circumferential sliding region being present between head regions of a radially outermost row of grooves of the slide ring and an outer radial edge of the slide ring,
wherein the first radius is smaller than the third radius,
wherein the second radius is smaller than the fourth radius, and
wherein the plurality of first grooves and the plurality of second grooves have a respective depth which changes from the foot regions thereof to the head regions thereof.
2. The mechanical seal according to claim 1 , wherein the fourth radius is at most 20% larger than the second radius.
3. The mechanical seal according to claim 1 , wherein the depth of the grooves decreases starting from the foot region towards the head region.
4. The mechanical seal according to claim 1 , wherein the grooves are formed in a crescent shape having an arcuate course.
5. The mechanical seal according to claim 4 , wherein the grooves are sickle-shaped V-grooves having a tip at the head region.
6. The mechanical seal according to claim 4 , wherein the grooves of the rotating slide ring are arranged in the opposite direction to the grooves of the stationary slide ring.
7. The mechanical seal according to claim 1 , wherein the grooves of the rotating slide ring and the stationary slide ring have an overlapping area of at least 10% of the groove regions.
8. The mechanical seal according to claim 1 , wherein the grooves of the rotating slide ring and the stationary slide ring have no overlap region.
9. The mechanical seal according to claim 1 , wherein one of the slide rings has a third row of a plurality of third grooves.
10. The mechanical seal according to claim 9 , wherein the other one of the slide rings has a fourth row of a plurality of fourth grooves.
11. The mechanical seal according to claim 1 , wherein a geometrical shape is the same for all grooves located on a slide ring.
12. The mechanical seal according to claim 1 , wherein the mechanical seal is a gas seal for sealing gaseous media.
13. A mechanical seal comprising:
a rotating slide ring and a stationary slide ring defining a sealing gap therebetween,
one of the slide rings having at least a first row of a plurality of first grooves each having a foot region on a first radius and a head region on a second radius, a first circumferential slide region being present between head regions of a radially innermost row of grooves of said slide ring and an internal radial edge of the slide ring,
the other of the slide rings having at least a second row of a plurality of second grooves each with a foot region on a third radius and a head region on a fourth radius, a second circumferential slide region being present between head regions of a radially innermost row of grooves of the slide ring and an internal radial edge of the slide ring,
wherein the first radius is larger than the third radius,
wherein the second radius is larger than the fourth radius, and
wherein the plurality of first grooves and the plurality of second grooves have a respective depth which changes from the foot regions thereof to the head regions thereof.
14. The mechanical seal according to claim 13 , wherein the fourth radius is smaller than the second radius by a maximum of 20%.
15. The mechanical seal according to claim 13 , wherein the depth of the grooves decreases starting from the foot region towards the head region.
16. The mechanical seal according to claim 13 , wherein the grooves are formed in a crescent shape having an arcuate course.
17. The mechanical seal according to claim 16 , wherein the grooves are sickle-shaped V-grooves having a tip at the head region.
18. The mechanical seal according to claim 16 , wherein the grooves of the rotating slide ring are arranged in the opposite direction to the grooves of the stationary slide ring.
19. The mechanical seal according to claim 13 , wherein the grooves of the rotating slide ring and the stationary slide ring have an overlapping area of at least 10% of the groove regions.
20. The mechanical seal according to claim 13 , wherein the grooves of the rotating slide ring and the stationary slide ring have no overlap region.
21. The mechanical seal according to claim 13 , wherein one of the slide rings has a third row of a plurality of third grooves.
22. The mechanical seal according to claim 21 , wherein the other one of the slide rings has a fourth row of a plurality of fourth grooves.
23. The mechanical seal according to claim 13 , wherein a geometrical shape is the same for all grooves located on a slide ring.
24. The mechanical seal according to claim 13 , wherein the mechanical seal is a gas seal for sealing gaseous media.