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AssigneeMTU Motoren-und Turbinen-Union Munchen GmbH
InventorsGerhard Rucker, Wilfried Weidmann, Karl-Ullrich Reisenweber
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A rotary ring seal with gas-dynamic lubrication for high-speed turbomachines, particularly gas turbine engines, in which one of two complementary rings is radially perforated with apertures which extend in parallel with the ring sealing face and which are supplied with a cooling liquid. In order to achieve a durable seal, particularly with regard to high temperatures and speeds, a circumferentially periodically uniformly increasing and decreasing number of holes extending through the mating ring provide for the generation of a periodically alternating temperature and, consequently, an axial-expansion zone of the ring so as to produce a periodically uniformly undulated sliding surface on the mating ring which corresponds to the lubricant wedge profile of a gas-dynamic thrust bearing.
In a rotary seal with gas-dynamic lubrication for high-speed turbomachines, particularly gas turbine engines, including two cooperating rings, one of said cooperating rings being a mating ring radially perforated with bore holes extending in parallel with the ring sealing face and supplied with a cooling liquid, the improvement comprising in that a circumferentially periodically uniformly increasing and decreasing number of said bore holes in said mating ring generate a periodically alternating temperature and an axial expansion zone on the ring so as to produce a periodically uniformly undulated sliding surface on the mating ring which conforms with the lubricant wedge profile of a gas-dynamic bearing.
Dependencies are inferred from the claim text.