Seal structure for gas turbine combustor

• US 8,069,673 B2
• Filed: 04/26/2010
• Issued: 12/06/2011
• Est. Priority Date: 08/23/2005
• Status: Active Grant

• Current Assignee: Mitsubishi Power Limited (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Kunitake, Nobuhiro, Aoyama, Kuniaki, Fujimoto, Kiyoshi, Minami, Masaharu
• Primary Examiner(s): Rodriguez, William
• Assistant Examiner(s): Dwivedi, Vikansha
• Application Number:
  US12/767,055
• Publication Number:
  US 20100201080A1
• Time in Patent Office: 589 Days
• Field of Search: 60752-760, 608/05, 607/97, 607/99, 608/00, 277/637, 277/644, 277/654, 277/906
• US Class Current: 60/797
• CPC Class Codes: F01D 11/005 Sealing means between non relatively rotating elements
• CPC Class Codes: F01D 9/023 Transition ducts between combustor cans and first stage of the turbine in gas-turbine engines; their cooling or sealings
• CPC Class Codes: F02C 7/28 Arrangement of seals
• CPC Class Codes: F05D 2240/57 Leaf seals
• CPC Class Codes: F16J 15/0887 the sealing effect being obtained by elastic deformation of the packing

Abstract

Provided is a seal structure, according to the present invention, for sealing opposite surfaces of flanges between adjacent tail ducts, which can be prevented from being worn or aged deteriorated due to a thermal deformation in a high temperature atmosphere or vibration of a gas turbine combustor, and which can maintain a satisfactory sealing function for a long time. The seal structure is characterized in that recess grooves are formed in opposed surfaces of adjacent flanges at the outlet end of tail ducts, striding between the opposed surfaces, a seal assembly composed of a seal member and a leaf spring is inserted in the recess grooves, the seal member has a pair of continuous beads which are arranged facing the inner surfaces, on the combustion gas passage side, of the recess grooves, striding between the opposed surfaces of the flanges within the recess grooves, the leaf spring is arranged so as to be contact with the seal member within the recess grooves so that the beads are pressed against the surfaces on the combustion gas passage side by the resilient force of the leaf spring so as to create seal surfaces.

Claims

1. A seal structure between tail ducts of a plurality of combustors arranged in the circumferential direction of a gas turbine, in connection between outlet ends of the tail ducts of the combustors and the inlet nozzle of the gas turbine, characterized in that:

recess grooves are formed respectively opposed surfaces of flanges of adjacent tail ducts at the outlet ends of the tail ducts,

a seal assembly composed of a long length seal member and a leaf spring juxtaposed with the seal member is inserted in the recess grooves,

the seal member has continuous beads on opposite side end parts of one of surfaces of the seal member,

the beads are arranged striding between the opposed surfaces of the flanges of the tail ducts and facing the combustion gas passage side in the recess grooves,

the leaf spring is arranged on the compressed air passage side of the seal member in the recess grooves,

the leaf spring has a resilient force for pressing the beads against inner surfaces, on the combustion gas passage side, of the recess grooves, and

the seal member and the leaf spring are formed being separated from each other, and the leaf spring has opposite end parts lifted up so as to serve as free end parts, and a center part attached to both inner surfaces on the compressed air passage side, of the recess groove facing the seal member, through the intermediary of an attaching plate for welding, and the seal member is provided at positions opposed to the opposite end pats of the leaf spring, with support plates having, at its opposite side end parts, rounded sectional shape beads striding between the opposed surfaces of the flanges of the tail ducts within the recess grooves.

2. A seal structure for a gas turbine combustor as set forth in claim 1, characterized in that the beads or the inner surfaces, on the combustion gas passage side, of the recess grooves, with which the beads are made into contact, are coated thereover with a wear-resistant film.