US 5,058,905 AGranted

Seal

OwnerJosef Nosowicz, Rudolf Kollingerinventors

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Abstract

The sliding face (22) of a gas lubricated slide ring seal has a slide ring (20) which is displaceable in the axial direction at a wall (4) to be sealed and lies against the sliding face (21) of a mating ring (10) which is fastened on an intermediate sleeve (10) so as to be immovable and sealing. The intermediate sleeve is rotatably mounted by roller bearings (16) on the shaft (2) to be sealed and is sealed against the shaft by a dynamic sealing device (15). Between the shaft (2) and the intermediate sleeve (10) a coupling (17) is provided which couples the shaft with the intermediate sleeve (10) during rotation of the shaft in its regular direction of rotation (1'), thus driving the mating ring (19) and pumping gas from the chamber (6) to be sealed through conveying grooves (24) disposed in its sliding face (21) into the area between the two sliding faces 21, 22). In the opposite direction of rotation (1"), the coupling (17) decouples for preventing the sliding faces (21, 22), from performing a relative movement opposite to that during rotation in the regular direction (1').

Claims11

Dependent claims

In a seal for a shaft (2) rotating, in regular operation, in a first direction of rotation (1') and passing through a wall (4;

4') separating a higher pressure chamber from a lower pressure chamber, the seal comprising at lest one seal component group (8;
8') performing a sealing function in the first direction of rotation (1') and including a first sealing member (19;
19') supported radially and in at least one axial direction at one of the shaft (2) and a component (9) fixed thereto and connected with one of the shaft (2) and the component (9) by way of a first torque transmitting device while being sealed against the shaft (2) by means of a first auxiliary sealing arrangement;
said seal component group further including a second sealing member (20;
20') supported at one of the wall (4;
4') and a component fixed to the wall in the radial direction and in at least one axial direction and being connected with one of the wall (4;
4') and the component fixed to the wall by way of a second torque transmitting device while being sealed against one of the wall (4;
4') and the component fixed to the wall by means of a second auxiliary sealing arrangement, the two sealing members (19, 20;
19', 20') lying against one another at a sealing gap (23;
23') absorbing a relative rotational movement, the improvement wherein at least one of the sealing members (19;
19';
37) is arranged to be rotatable on a bearing (16) coaxial with the shaft (2);
the torque transmitting device of each sealing member comprising a free-wheeling coupling (17;
17') which, when the shaft (2) rotates in the first direction of rotation (1'), couples in the sense of transmitting torque and in the second direction of rotation (1") uncouples;
and each auxiliary seal arrangement associated with a sealing member (19;
19';
37) having a free-wheeling coupling (17;
17') including a dynamic sealing device (15;
15';
15") arranged to absorb a relative rotational movement at least for a limited period of time and sealing a leakage path created by the free-wheeling coupling (17;
17') and the bearing (16).

18 more elements

In a seal for a shaft (2) rotating, in regular operation, in a first direction of rotation (1') and passing through a wall (4;

4') separating a higher pressure chamber from a lower pressure chamber, the seal comprising at least one seal component group (8;
8') performing a sealing function in the first direction of rotation (1') and including a first sealing member (19;
19') supported radially and in at least one axial direction at one of the shaft (2) and a component (9) fixed thereto and connected with one of the shaft (2) and the component (9) by way of a first torque transmitting device while being sealed against the shaft (2) by means of a first auxiliary sealing arrangement;
said seal component group further including a second sealing member (20;
20') supported at one of the wall (4;
4') and a component fixed to the wall in the radial direction and in at least one axial direction and being connected with one of the wall (4;
4') and the component fixed to the wall by way of a second torque transmitting device while being sealed against one of the wall (4;
4') and the last-named component by means of a second auxiliary sealing arrangement, the two sealing members (19, 20;
19', 20') lying against one another at a sealing gap (23;
23') absorbing a relative rotational movement, the improvement wherein at least one of the sealing members (19;
19';
37) is arranged to be rotatable on a bearing (16) coaxial with the shaft (2);
the torque transmitting device of each sealing member comprising a friction coupling which limits the transmitted torque and is dimensioned such as to establish a substantially slip-free connection up to a predetermined torque which is slightly greater than the maximum torque occurring during regular operation when the shaft (2) rotates in the first direction of rotation (1') and permits a relative rotational movement when said predetermined torque is exceeded;
and each auxiliary seal arrangement associated with a sealing member (19;
19';
37) having a friction coupling including a dynamic sealing device (15;
15';
15") arranged to absorb a relative rotational movement at least for a limited period of time and sealing a leakage path created by the friction coupling and the bearing (16).

15 more elements

Dependencies are inferred from the claim text.