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US 4,821,507 AGranted
Gas flow diverter
AssigneeBachmann Industries, Inc.
InventorsLothar Bachmann, William F. Koch
Life of this patent
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AssigneeBachmann Industries, Inc.
InventorsLothar Bachmann, William F. Koch
Estimating the term…
A gas flow diverter receives large volumes of hot gases from a gas turbine and has a blade adapted to close either the outlet port to a heat recovery steam generator or the outlet port to the stack. Each port is surrounded by an open channel the two side walls of which are each provided with a seal with both exposed, one beyond the other. The surfaces of the blade are stainless steel cladding and are connected through insulation to a reinforcement in a manner permitting but confining the expansion of the cladding. The frame has a border providing first and second ledges on each side which are spaced and positioned so that each may engage a different one of the two seals bordering an outlet port when closed thus establishing the channel as a closed passageway surrounding the closed port which may be sealed against leakage by discharging sealing air into it. The blade is shifted between its two operative positions by means of a reversible drive including toggle joints connected to the blade reinforcement by a unit which is shiftable in response to forces exerted by the expanding or contracting toggle joints.
A gas flow diverter for use as the junction between the exhaust of a gas turbine, a stack and the inlet of a heat recovery steam generator, said diverter including a chamber having an inlet port connectable to the exhaust of the turbine, an aligned outlet port connectable to the intake of the generator and an upwardly opening outlet port connectable to the stack, insulation secured to the interior surfaces of the chamber, a blade within the chamber and provided with a pivot shaft rotatably supported by the chamber with its axis equidistant from the outlet ports, said blade shaped and dimensioned to swing between positions in which either outlet port is closed thereby and the other is opened, said blade including a frame both sides of which constitute first ledges and a central projection both sides of which constitute second ledges, sealing frames, one surrounding each outlet port and U-shaped in cross section with one side wall longer than the other and secured to the interior of the chamber with the open ends of the sealing frames opening into the chamber in the same plane, first and second seals carried by said longer and other walls, respectively, and spaced and dimensioned to be engaged by the first and second ledges, respectively, on the appropriate side of the blade frame when the blade is in a port closing position, actuating means connected to said blade and operable to swing said blade to bring the ledges thereof into and out of engagement with the seals of either sealing frame, and means to deliver sealing air into the space within either sealing frame when the seals thereof are engaged by first and second ledges of the frame of the blade.
A gas flow diverter for use as the junction between the exhaust of a gas turbine, a stack and the inlet of a heat recovering steam generator, said diverter including a chamber having an inlet port connectable to the exhaust of the turbine, an aligned outlet port connectable to the intake of the generator and an upwardly opening outlet port connectable to the stack, insulation secured to the interior surfaces of the chamber, a blade within the chamber and provided with a pivot shaft rotatably supported by the chamber with its axis equidistant from the outlet ports, said blade shaped and dimensioned to swing between positions in which either outlet port is closed thereby and the other is opened, said blade including a frame, a sealing frame surrounding each outlet port and secured to the interior of the chamber, said blade and sealing frames including marginal portions, those of the blade frame for engagement with those of whichever one of the sealing frames surrounds the outlet port to be closed, the engageable portions of the frames provided with complemental sealing members, and means connected to said blade and operable to swing said blade into and out of positions closing either outlet port, said blade swinging means including a reversible drive having a drive shaft extending across an outlet port, a plurality of toggle joints having links connected to said shaft, and units, one of each toggle joint and provided with a base plate connected to the blade, a second plate to which a toggle joint link is pivotally connected, and a resilient connection between said plates enabling said second plate to move relative to the base plate in response to thermal expanding forces exerted thereon by the toggle joint connected thereto.
Dependencies are inferred from the claim text.