Gas turbine transition piece air bypass band assembly

Abstract

An air bypass band assembly includes a transition piece of a gas turbine, the transition piece having at least one opening therein to allow a flow of air to pass through the at least one opening. The air bypass band assembly also includes a band that is movable between at least two positions, a first one of the at least two positions being a closed position where the at least one opening is closed to prevent the flow of air from flowing through the at least one opening, a second one of the at least two positions being an open where the at least one opening is opened to allow the flow of air to flow through the at least one opening. The air bypass band assembly further includes a mechanism that moves the band between the at least two positions.

1 . An air bypass band assembly, comprising:
 a transition piece of a gas turbine, the transition piece having at least one opening therein to allow a flow of air to pass through the at least one opening;   a band that is movable between at least two positions, a first one of the at least two positions being a closed position where the at least one opening is closed to prevent the flow of air from flowing through the at least one opening, a second one of the at least two positions being an open position where the at least one opening is opened to allow the flow of air to flow through the at least one opening;   a mechanism that moves the band between the at least two positions.   
     
     
         2 . The air bypass band assembly of  claim 1 , wherein the transition piece has a plurality of openings that allow a flow of air to pass through the plurality of openings. 
     
     
         3 . The air bypass band assembly of  claim 1 , wherein the at least one opening is located at one of a forward end of the transition piece, a combustor liner aft end, or a combustor head end. 
     
     
         4 . The air bypass band assembly of  claim 1 , wherein the flow of air flows through a cavity of a forward ring co-located with the transition piece, the at least one opening being located in a surface of the forward ring. 
     
     
         5 . The air bypass band assembly of  claim 1 , wherein when the band is in the open position, the flow of air flows through a cavity of a forward ring co-located with the transition piece, the at least one opening located in a surface of the forward ring, the flow of air further flows within a bypass manifold cavity co-located with the transition piece, the flow of air further flows through at least one floating tube co-located with the transition piece and into an opening within the transition piece. 
     
     
         6 . The air bypass band assembly of  claim 1 , wherein when the band is in the closed position, the flow of air flows through a cavity of a forward ring co-located with the transition piece. 
     
     
         7 . The air bypass band assembly of  claim 1 , wherein the mechanism further comprises an actuator, a pair of gears, a pair of levers each connected with one of the gears, and a pair of shackles connected with a corresponding one of the levers and a corresponding end of the band, the actuator causing the pair of gears, the pair of levers and the pair of shackles to move the band between the at least two positions. 
     
     
         8 . An air bypass band assembly portion of a gas turbine, comprising:
 a transition piece, the transition piece having a plurality of openings therein to allow a flow of air to selectively pass through the plurality of opening;   a band that is movable between at least two positions, a first one of the at least two positions being a closed position where the plurality of openings are closed to prevent the flow of air from flowing through the plurality of openings, a second one of the at least two positions being an open where the plurality of openings are opened to allow the flow of air to flow through the plurality of openings;   a mechanism that moves the band between the at least two positions.   
     
     
         9 . The air bypass band assembly portion of a gas turbine of  claim 8 , wherein the plurality of openings are located at one of a forward end of the transition piece, a combustor liner after end, or a combustor head end. 
     
     
         10 . The air bypass band assembly portion of a gas turbine of  claim 8 , wherein the flow of air flows through a cavity of a forward ring co-located with the transition piece, the plurality of openings being located in a surface of the forward ring. 
     
     
         11 . The air bypass band assembly portion of a gas turbine of  claim 8 , wherein when the band is in the open position, the flow of air flows through a cavity of a forward ring co-located with the transition piece, the plurality of openings located in a surface of the forward ring, the flow of air further flows within a bypass manifold cavity co-located with the transition piece, the flow of air further flows through a plurality of floating tubes co-located with the transition piece and into an opening within the transition piece. 
     
     
         12 . The air bypass band assembly portion of a gas turbine of  claim 8 , wherein when the band is in the closed position, the flow of air flows through a cavity of a forward ring co-located with the transition piece. 
     
     
         13 . The air bypass band assembly portion of a gas turbine of  claim 8 , wherein the mechanism further comprises an actuator, a pair of gears, a pair of levers each connected with one of the gears, and a pair of shackles connected with a corresponding one of the levers and a corresponding end of the band, the actuator causing the pair of gears, the pair of levers and the pair of shackles to move the band between the at least two positions. 
     
     
         14 . The air bypass band assembly portion of a gas turbine of  claim 8 , wherein the band comprises a flexible material. 
     
     
         15 . An air bypass band assembly, comprising:
 a transition piece of a gas turbine, the transition piece having at least one opening therein to allow a flow of air to pass through the at least one opening;   a band located radially around at least a portion of the transition piece, the band being movable between at least two positions, a first one of the at least two positions being a closed position where the at least one opening is closed to prevent the flow of air from flowing through the at least one opening, a second one of the at least two positions being an open where the at least one opening is opened to allow the flow of air to flow through the at least one opening;   a mechanism that moves the band between the at least two positions.   
     
     
         16 . The air bypass band assembly of  claim 15 , wherein the transition piece has a plurality of openings that allow a flow of air to pass through the plurality of openings. 
     
     
         17 . The air bypass band assembly of  claim 15 , wherein the at least one opening is located at one of a forward end of the transition piece, a combustor liner aft end, or a combustor head end. 
     
     
         18 . The air bypass band assembly of  claim 15 , wherein the flow of air flows through a cavity of a forward ring co-located with the transition piece, the at least one opening being located in a surface of the forward ring. 
     
     
         19 . The air bypass band assembly of  claim 15 , wherein when the band is in the open position, the flow of air flows through a cavity of a forward ring co-located with the transition piece, the at least one opening located in a surface of the forward ring, the flow of air further flows downstream within a bypass manifold cavity co-located with the transition piece, the flow of air further flows downstream through at least one floating tube co-located with the transition piece and into an opening within the transition piece. 
     
     
         20 . The air bypass band assembly of  claim 15 , wherein when the band is in the closed position, the flow of air flows through a cavity of a forward ring co-located with the transition piece.