ARRANGEMENT WITH A GAS SEAL
An arrangement having a gas seal, a stator and a rotor extending along an axis for sealing a sealing gap between the rotor and the stator, including a rotating rotor sealing ring and a static stator sealing ring, comprising a rotating fixing element, which axially fixes the rotor sealing ring at the rotor is provided.
1 . An arrangement with a gas seal, a stator and a rotor which extends along an axis for sealing a sealing gap between the rotor and the stator, comprising;
a rotating rotor sealing ring;
a static stator sealing ring; and
a rotating fastening element that fixes the rotating rotor sealing ring axially on the rotor, the fastening element extending at least over a part of a circumference in a circumferential direction, and being arranged at least partially in a gap of a radial gap height that extends axially and in the circumferential direction between the rotor and the rotating rotor sealing ring, the gap being defined on a side of the rotating rotor sealing ring by a sealing ring surface and on a side of the rotor by a rotor surface, the sealing ring surface having a first depression and the rotor surface having a second depression;
wherein the fastening element is arranged in the first depression and partially in the second depression, in such a way that an axial relative movement beyond a setpoint position range between the rotating rotor sealing ring and the rotor is possible only via a radial deformation of the fastening element.
2 . The arrangement as claimed in claim 1 , wherein the fastening element is of a radially elastically deformable configuration, with the result that the fastening element deforms elastically during the axial relative movement beyond the setpoint position range.
3 . The arrangement as claimed in claim 2 , wherein the fastening element deforms exclusively elastically during the axial relative movement beyond the setpoint position range.
4 . The arrangement as claimed in claim 1 , wherein the fastening element extends over the entire circumference.
5 . The arrangement as claimed in claim 1 , wherein the fastening element is configured as a flat section helix.
6 . The arrangement as claimed in claim 1 , further comprising a stationary auxiliary sealing element that seals the rotating rotor sealing ring against the rotor on a rotor shoulder, the stationary secondary sealing element exerting an axial prestressing force on the rotating rotor sealing ring.
7 . The arrangement as claimed in claim 6 , wherein the fastening element is of elastic configuration in such a way that it generates an axial restoring force counter to an axial relative displacement out of the setpoint position, the axial restoring force being higher than the axial prestressing force of the stationary secondary sealing element.
8 . The arrangement as claimed in claim 5 , wherein the fastening element comprises a flat steel helix.
9 . The arrangement as claimed in claim 8 , wherein a material of the flat steel helix is sour gas resistant.
10 . The arrangement as claimed in claim 1 , wherein the first depression and/or the second depression is delimited axially on both sides over at least part of the circumference by, in each case, one radial projection.
11 . The arrangement as claimed in claim 1 , wherein the fastening element is deformed radially elastically when the rotating rotor sealing ring and the rotor are situated with respect to one another in the setpoint position range, in such a way that a perpendicular force on the surfaces of the first depression and the second depression that results from the elastic deformation gives rise to a resulting frictional force between the surfaces and the fastening element, which frictional force transmits a torque which arises during operation from the rotor sealing ring to the rotor.