This invention pertains to a transition piece of a type used in a gas turbine to connect a combustor to a stage.
A transition piece of the type noted above is exemplified in U.S. Pat. No. 5,414,999, the disclosure of which is incorporated by reference herein. This invention addresses perceived shortcomings in the transition piece disclosed therein. As disclosed therein, the transition piece has an inlet to receive hot gases and an outlet to discharge the gases. Moreover, the transition piece has a frame, which frames the outlet and which has three ribs surrounding and extending away from the outlet. The frame has a longer, arcuate portion, a shorter, arcuate portion, two lateral, radial portions, which are shorter than the shorter, arcuate portion, and four rounded, corner portions joining the arcuate and radial portions. Moreover, a mounting connector extends from a middle one of those ribs, away from the outlet.
Broadly, this invention provides a transition piece of the type noted above, wherein the mounting connector does not extend from such a rib but, rather, wherein the mounting connector is mounted to a pedestal, which is mounted to the frame so as to extend partially but not completely around the outlet. Preferably, the mounting connector and the pedestal are unitary and are welded to the frame.
Preferably, rather than one mounting connector, the transition piece has two mounting connectors, each being mounted to the pedestal. Preferably, moreover, the mounting connectors and the pedestal mounting the mounting connectors to the frame are unitary and are welded to the frame.
Preferably, if the frame has a longer, arcuate portion, a shorter, arcuate portion, two lateral, radial portions, which are shorter than the shorter, arcuate portion, and four rounded, corner portions joining the arcuate and radial portions, the pedestal is mounted to the longer, arcuate portion of the frame and extends completely along the larger, arcuate portion, completely along each of the rounded, corner portions adjoined to the longer, arcuate portion, and substantially less than halfway along each of the lateral, radial portions where adjoined to one of the rounded, corner portions adjoined to the longer, arcuate portion, but the pedestal does not extend further along either of the lateral, radial portions and does not extend along any part of the shorter, arcuate portion.
Optionally, the frame has plural ribs surrounding and extending away from the outlet. However, the mounting connector, if one mounting connector is provided, does not extend from any of those ribs. Moreover, neither mounting connector, if two mounting connector are provided, extends from any of those ribs.
As illustrated in
As illustrated in the several views of the drawings, the transition piece 10 has two mounting connectors 60, which are spaced from each other, which are mounted to the larger, arcuate portion 42 of the frame 30, in a manner described below, so as to extend away from the outlet 20, and which are used to connect the transition piece 10, via a bolt, to a mounting connector of the associated stage of the gas turbine. A generally similar bolting arrangement is illustrated in FIGS. 1 and 2 (“PRIOR ART”) of U.S. Pat. No. 5,414,999, supra, and is described in column 1, lines 15 through 40, thereof.
The transition piece 10 has a pedestal 70, which is formed unitarily with the frame 30 and which, as illustrated in
Being mounted to the frame 30 via the pedestal 70, which in cross-section is several times wider when compared to either of the ribs 50 in cross-section, each mounting connector 60 is mounted to the frame 30 more rigidly, as compared to a mounting connector extending from such a rib in a manner disclosed in U.S. Pat. No. 5,414,999. Moreover, where the mounting connectors 60 are mounted, the pedestal 70, which extends continuously between the mounting connectors 60 and which extends further beyond the mounting connectors 60, reinforces the frame 30.
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Number | Date | Country |
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0 718 468 | Jun 1996 | EP |
Number | Date | Country | |
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20070033941 A1 | Feb 2007 | US |