Patent ID: 8444153
Filing Date: 2013-05-21
Classification: F01D,F16J

Abstract:
1. An arrangement for sealing first and second shafts positioned in a casing, comprising at least one hydraulic seal including: wherein, the hydraulic seal is positioned on one chosen from an inner side and an outer side of the shaft, and one chosen from the cavity and the sealing element of the hydraulic seal is connected to a fixed wall of the casing; wherein the fixed wall separates the first and second shafts from each other, with the at least one hydraulic seal including a first hydraulic seal being arranged on the first shaft and a second hydraulic seal arranged on the second shaft; wherein the first shaft and the second shaft are counter-rotating shafts; wherein the first shaft rotates in a first circumferential direction, the second shaft rotates in a second circumferential direction opposite to the first circumferential direction; wherein a portion of the first hydraulic seal attached to the fixed wall of the casing opposes rotation of hydraulic fluid in the first hydraulic seal in the first circumferential direction and a portion of the second hydraulic seal attached to the fixed wall of the casing opposes rotation of hydraulic fluid in the second hydraulic seal in the opposite second circumferential direction to isolate the rotation of hydraulic fluids in the first and second hydraulic seals from each other.