JP2014173696A - Opening/closing device for high-temperature gas passage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening/closing device for a high-temperature gas passage capable of suppressing weld cracks, high-temperature cracks, peeling, or the like while avoiding on-site construction of a heat insulation material.SOLUTION: An exhaust damper 7 includes, inside a casing 18, a high-temperature gas passage 8 and a valve body 26 for opening/closing the high-temperature gas passage 8. The casing 18 of the exhaust damper 7 includes: an internal member 42 made of a metal plate that is exposed to the high-temperature gas passage 8; an external member 44 made of a metal plate that is exposed to ambient air; and a flexible heat insulation material 46 interposed between the internal member 42 and the external member 44. The internal member 42 is engaged with the heat insulation material 46 and is coupled to the external member 44 with the insulation material 46 interposed therebetween in a relatively movable manner.

Description

  The present invention relates to an open / close device for a high-temperature gas passage, which is disposed, for example, between a gas turbine and an exhaust heat boiler.

  Since the exhaust gas of the gas turbine is at a high temperature of 500 ° C. or more and is a rotating flow, the damper (opening / closing device) provided in the exhaust duct of the gas turbine is composed of a stainless steel plate or a molybdenum steel steel plate (SB material), A so-called external heat retaining material in which a heat insulating material is externally attached to the outside of the plate material is used (for example, Patent Document 1). In the case of external heat insulation, it is necessary to perform insulation work at the site (installation location). Specifically, in order to retighten the flange of the damper, leave it uninsulated until the trial run, and after tightening it in a stretched state with heat applied during the trial run, install the insulation. Do. Therefore, there is a possibility that rust may be generated in the exhaust duct, the bolt hole, and the like while it is left before the trial operation, and it is necessary to take measures to suppress the generation of rust, which is troublesome. In addition, although it is a technique regarding a silencer, there is also a technique in which a fiber-based sound absorbing material is attached to a silencer casing, and the surface of the sound absorbing material is covered with a perforated plate or a metal net (for example, Patent Document 1).

Japanese Patent No. 3073420

  For example, in the case of a cogeneration facility, the exhaust gas has a high internal pressure of 0.25 KpaG due to the pressure loss of the exhaust heat boiler, etc., and is a rotating flow at a high temperature. There is a possibility of cracking. Furthermore, in operation, in the case of "operations that start and stop every day" and "operations that start and stop every other week", the material of the damper itself deteriorates due to the expansion and contraction load due to heat and the repeated load of residual stress, Hot cracks may occur in areas other than welds. Then, such a weld crack, a high temperature crack, etc. were avoided by giving a castable (refractory material) and a ceramic heat insulating material inside a damper.

  However, since the castable is weak against vibration and easily cracked, there is a concern that the castable may fall off when applied to a gas turbine damper. In addition, the internal heat insulation structure using ceramic heat insulating material is suitable for dampers through which rectified exhaust gas flows, dampers with sufficient inner area and low flow velocity exhaust gas, etc. In addition, in the case of a rotating flow with a flow velocity of around 100 m / s, exhaust gas enters the gap between the stacked tile-shaped plates (plates configured to slide in consideration of thermal elongation) that hold down the ceramic insulation. Therefore, there is a concern that the plate may be deformed and peeled off, or the heat insulating material may be sucked up and scattered.

  This invention is made | formed in view of the said subject, and it aims at providing the switch apparatus of the hot gas which can suppress a weld crack, a hot crack, peeling, etc., avoiding construction of the heat insulating material in the field.

  In order to achieve the above object, a switching device for a high-temperature gas passage according to the present invention is a switching device having a high-temperature gas passage and a valve body for opening and closing the high-temperature gas passage in a casing. A metal plate lining member exposed to the metal plate, a metal plate lining member, and a flexible heat insulating material interposed therebetween, and the lining member is locked to the heat insulating material. The outer member is connected to the outer member through the heat insulating material so as to be relatively movable.

  According to this configuration, the casing forming the high temperature gas passage has the lining member exposed to the high temperature gas passage, the outer lining member exposed to the outside air, and the flexible heat insulating material interposed therebetween. Since it is constituted by so-called internal heat insulation, it is possible to construct the heat insulating material at the factory, and it is not necessary to install the heat insulating material and prevent rust on site. Moreover, since it is not necessary to apply a refractory material or a heat insulating material to the inside of the casing, they will not fall off or peel off. Further, since the outer member constituting the outer shell of the switchgear is not exposed to the high temperature gas, it is possible to suppress the deterioration of the flange portion and the seal portion provided in the outer member and the occurrence of the hot crack. In addition, since the outer member is not exposed to high-temperature gas, it is not necessary to use an expensive heat-resistant metal such as a stainless steel plate or a molybdenum steel plate, and the switchgear can be manufactured at a low cost as a whole. Furthermore, since the lining member is locked to the heat insulating material and is connected to the outer lining member via the heat insulating material so as to be relatively movable, thermal stress generated in the lining member can be suppressed, and the high temperature gas can be contacted. It is possible to suppress the occurrence of weld cracks by eliminating welds at the locations.

  In this invention, it is preferable that the locking piece which protrudes outside and is locked to the end surface of the said heat insulating material is provided in the edge part of the said lining member. According to this configuration, the lining member can be connected to the outer lining member so as to be relatively movable without providing a weld portion with a simple structure.

  In the present invention, the nozzle further supported by the lining member of the casing and opened and closed by the valve body, and the heat insulating material fixed between the lining member and existing between the lining member and the nozzle. It is preferable to include a circumferential direction regulating member and an axial direction regulating member for regulating the position of a part of the nozzle in the circumferential direction and the axial direction of the nozzle, respectively. According to this structure, it can suppress that a nozzle shifts | deviates with the force added to a nozzle by opening and closing a valve body.

  When the circumferential direction regulating member is provided, it is preferable that the plurality of circumferential direction regulating members are made of a plurality of plate members that are spaced apart from each other in the circumferential direction of the nozzle and extend in the radial direction. According to this configuration, the position of the heat insulating material can be regulated with a simple structure.

  In the case where an axial restriction member is provided, the axial restriction member is preferably a flange that protrudes radially outward from the outer peripheral surface of the nozzle. According to this structure, since an axial direction control member can be comprised, without adding a new component, it can suppress that a number of parts increases.

  The hot gas passage opening and closing device of the present invention includes the hot gas inlet, the first outlet, and the second outlet, and the valve body includes the first outlet and the second outlet. It can also be applied to a three-way valve that selectively opens and closes.

  In the present invention, a valve shaft that is fixed to the valve body and rotates passes through a through-hole provided in the casing and is supported by the casing, and the through-hole is interposed between the heat insulating material and the valve shaft. A rotation support member made of a highly heat-resistant material that forms a hole is interposed, and a seal structure that seals the through hole is provided on the outer surface of the outer member, and the valve shaft is disposed outside the seal structure. It is preferable to provide a bearing.

  In conventional external insulation type switching devices, since the casing is hot, it is difficult to seal between the casing and the valve shaft, and the bearing that supports the valve shaft is also exposed to high temperatures. The frequency was high. However, according to this configuration, since the outer member is kept at a low temperature, the seal between the outer member of the casing and the valve shaft is easy, and the bearing is not exposed to a high temperature. The grease replacement frequency is low.

  According to the high-temperature gas passage opening and closing device of the present invention, the casing forming the high-temperature gas passage is constituted by internal heat insulation, so that the heat insulating material can be applied in the factory, and the heat insulating material can be applied in the field. Rust measures are not required. In addition, since the outer member is not exposed to the high temperature gas, it is possible to suppress the deterioration of the flange portion, the seal portion, etc. provided on the outer member and the occurrence of hot cracking, and it is not necessary to use an expensive heat resistant metal. As a whole, the switchgear can be manufactured at low cost. Furthermore, since the lining member is locked to the heat insulating material and is connected to the outer lining member via the heat insulating material so as to be relatively movable, thermal stress generated in the lining member can be suppressed, and the high temperature gas can be contacted. It is possible to suppress the occurrence of weld cracks by eliminating welds at the locations.

1 is a schematic configuration diagram illustrating a gas turbine system including an exhaust damper that is a kind of a hot gas switchgear according to a first embodiment of the present invention. It is a side view which shows the same exhaust damper. It is the rear view which looked at the same exhaust damper from the exhaust heat boiler side. It is a longitudinal cross-sectional view of the same exhaust damper. It is sectional drawing which expands and shows the V section of FIG. It is sectional drawing which expands and shows the VI section of FIG. (A) is a side view which shows the 1st control member of the same exhaust damper, (b) is a side view which shows the 2nd control member of the same exhaust damper. It is the VIII-VIII sectional view taken on the line of FIG. It is sectional drawing which expands and shows the valve-shaft penetration part of the same exhaust damper.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration diagram of a cogeneration system using a gas turbine. In this system, generated power is obtained by rotating the rotor of the generator G through the reduction gear R / G by the driving force of the gas turbine GT. The gas turbine GT includes a compressor 2, a combustor 4, and a turbine 6, and exhaust gas E is discharged from an exhaust duct 11 of the gas turbine GT.

  Specifically, an exhaust damper 7 which is a kind of a high-temperature gas switchgear is provided at the exhaust gas outlet of the gas turbine GT. The exhaust damper 7 converts the exhaust gas E from the exhaust gas outlet into the high-temperature gas passage 8 and the bypass passage 9. And selectively deriving.

  The exhaust gas E sent to the high temperature gas passage 8 is led to the exhaust heat boiler 12 and the economizer 14 on the downstream side thereof via the heat retaining duct 10. The water supplied to the economizer 14 is preheated by the exhaust gas E, supplied to the exhaust heat boiler 12 and vaporized. The steam from the exhaust heat boiler 12 is used, for example, as an absorption refrigerator or a heat source for generating hot water. The exhaust gas E that has been heat-recovered through the exhaust heat boiler 12 and the economizer 14 is discharged to the atmosphere through the exhaust duct 16. The exhaust gas E sent to the bypass passage 9 is directly discharged from the exhaust duct 16 to the atmosphere without passing through the exhaust heat boiler 12 and the economizer 14.

  As shown in FIG. 2, the exhaust damper 7 is a so-called three-way valve including a box-shaped casing 18 and an on-off valve unit 19. The casing 18 includes an exhaust gas inlet 20, a first outlet 22 having the same axis as the inlet 20, and a second outlet 24 having an axis perpendicular to the inlet 20. A valve body 26 of the opening / closing valve unit 19 is disposed in the casing 18 to selectively open and close the first outlet 22 and the second outlet 24.

  The inlet 20 is connected to the exhaust duct 11 of the gas turbine GT, the first outlet 22 is connected to the bypass duct 13 forming the bypass passage 9, and the second outlet 24 is connected to the inlet of the heat retaining duct 10. As shown in FIG. 4, the valve body 26 opens and closes the first and second outlets 22 and 24 by closely contacting a cylindrical nozzle 25 provided in the vicinity of the first and second outlets 22 and 24. . Specifically, when the valve body 26 is in the position of the solid line, the first outlet 22 is closed, and the exhaust gas E flowing in from the inlet 20 flows out from the second outlet 24 to the bypass passage 9, When the body 26 is in the position of the two-dot chain line, the second outlet 24 is closed, and the exhaust gas E flows out from the first outlet 22 to the high temperature passage 8 of the heat retaining duct 10. The valve body 26 is also set at an intermediate position where both the first outlet 22 and the second outlet 24 are partially opened. Details of the support structure of the nozzle 25 will be described later.

  The casing 18 includes an annular inlet protrusion 28 that forms the inlet 20, a first outlet protrusion 30 that forms the first outlet 22, and a second outlet protrusion 32 that forms the second outlet 24. Have. The flange-like flange portions 28a, 30a, and 32a are formed at the protruding tips of the inlet protrusion 28, the first outlet protrusion 30, and the second outlet protrusion 32 in FIG. Each flange part 28a, 30a, 32a is formed with a plurality of bolt insertion holes (not shown) arranged in the circumferential direction.

  As shown in FIG. 3, a valve shaft 34 which is fixed to the valve body 26 of the on-off valve unit 19 and rotates is penetrated through the casing 18 and is rotatably supported by the casing 18. A drive motor 38 is connected to one end of the valve shaft 34 via a drive lever 36. The drive motor 38 is supported by the casing 18. Details of the support structure and seal structure of the valve shaft 34 will be described later.

  As shown in FIG. 5, the casing 18 includes a metal plate lining member 42 exposed to the high temperature gas passage 8, a metal plate lining member 44 exposed to the outside air, and a flexibility interposed therebetween. And a heat insulating material 46. The heat insulating material 46 may be a single layer or two or more layers.

  The lining member 42 is made of a metal having high heat resistance such as a stainless steel plate or a molybdenum steel plate, and is made of SUS304 having a thickness of 2 mm in this embodiment. The outer member 44 is made of inexpensive general structural steel, and in this embodiment is made of SS400 with a thickness of 6 mm. A rust preventive paint is applied to the outer surface of the outer member 44.

  An end 44a on the downstream side (right side in FIG. 5) of the outer member 44 of the casing 18 is connected by welding to one end (lower end in FIG. 5) of a connection member 68 constituting a part of the outer member. An end 64a on the upstream side (left side in FIG. 5) of the outer member 64 of the first outlet protrusion 30 is connected to the other end of 68 (upper end in FIG. 5) by welding. The flange portion 30a is fixed to the outer surface of the downstream end portion 64b of the outer member 64 of the first outlet protrusion 30 by welding. An annular outer locking portion 69 made of a plate material extending inward is fixed to the inner surface of the downstream end portion 64b of the outer member 64 of the first outlet projection 30 by welding. The surface facing the upstream side of the outer locking portion 69 is in contact with the end surface 46 a of the heat insulating material 46.

  A base end 48 b of a heat insulating material pressing plate 48 extending inward is attached to an end 42 a on the downstream side of the lining member 42 of the casing 18, and a distal end 48 a of the heat insulating material pressing plate 48 is connected to the nozzle 25. That is, the nozzle 25 is supported by the lining member 42 of the casing 18.

  Specifically, as shown in FIG. 6, a set of attachment members 50, 50 made of a plate material bent into an L shape is fixed to the outer surface of the nozzle 25 by welding. The L-shaped attachment members 50 and 50 are welded to the outer surface of the nozzle 25 by the first pieces 51 and 51, and the second pieces 52 and 52 are opposed to the flow direction D of the exhaust gas E through a gap. doing. In each of the second pieces 52, 52, through holes 52a, 52a facing the flow direction D are formed.

  An insertion hole 58 facing the flow direction D is formed at the tip 48 a of the heat insulating material pressing plate 48. The tip 48a of the heat insulating material pressing plate 48 is inserted into the gap so that the insertion hole 58 of the heat insulating material pressing plate 48 and the through holes 52a, 52a of the mounting members 50, 50 are aligned in the flow direction D. The heat insulating material pressing plate 48 and the nozzle 25 are not in contact with each other. A fixing pin 60 having a fixing washer 62 welded to one end thereof is inserted from the upstream side (heat insulating material side) into the insertion hole 58 of the heat insulating material pressing plate 48 and the through holes 52a and 52a of the mounting members 50 and 50, and then fixed. The washer 62 is fixed to the mounting members 50 and 50 by welding. The inner diameter of the insertion hole 58 of the heat insulating material pressing plate 48 is set sufficiently larger than the outer diameter of the fixing pin 60. Thereby, the thermal elongation of the heat insulating material pressing plate 48 is absorbed.

  As shown in FIG. 5, the nozzle 25 includes a nozzle upstream portion 70 on the most upstream side, a nozzle intermediate portion 72 on the downstream side thereof, and a nozzle downstream portion 74 on the outermost downstream side thereof, and is integrated by butt welding. Has been. The upstream end portion 25 b of the nozzle 25 abuts on the valve body 26 and closes the first outlet 22. The downstream end portion 25b of the nozzle 25, specifically, the downstream end portion 25b of the nozzle downstream portion 74 is bent outward to form an inner locking piece 76 protruding outward. The surface facing the upstream side of the inner locking piece 76 is in contact with the end surface 46 a of the heat insulating material 46. The inner locking piece 76 and the outer locking portion 69 are not in contact with each other.

  As described above, the nozzle 25 is supported by the lining member 42 of the casing 18, and the nozzle 25 forms a part of the lining member 42 of the casing 18 in the vicinity of the first outlet 22. That is, the inner locking piece 76 formed at the downstream end 25 b of the nozzle downstream portion 74 is a locking piece formed at the end of the lining member 42. By locking the inner locking piece 76 to the end surface 46 a of the heat insulating material 46, the lining member 42 (nozzle 25) can be moved relative to the outer member 44 through the heat insulating material 46 in a parallel direction. It is connected.

  Thus, the casing 18 has a structure in which the lining member 42 and the outer lining member 44 do not come into contact with each other over a wide area. As a result, the temperature of the exhaust gas E exceeds 550 ° C. in the high temperature gas passage 8, but the surface temperature of the outer member 44 exposed to the outside air is kept below 70 ° C.

  A flanged flange 78 is formed at the center of the nozzle 25 in the flow direction D of the high-temperature gas, specifically, at the downstream end 72 a of the nozzle intermediate portion 72. The flange 78 is provided so as to protrude radially outward from the outer peripheral surface of the downstream end 72 a of the nozzle intermediate portion 72. Specifically, the flange 78 is formed by bending the downstream end portion 72a of the nozzle intermediate portion 72 outward.

  A first regulating member 80 made of a plate material is fixed to the inner surface of the outer member 44 of the casing 18 by welding. A second regulating member 82 made of a plate material is disposed at a position slightly spaced from the first regulating member 80 in the circumferential direction, and is supported on the outer surface of the nozzle 25. The first restriction member 80 and the second restriction member 82 are disposed between the outer member 44 and the nozzle 25.

  As shown in FIG. 7A, the first restricting member 80 is formed by cutting a plate material into a Y shape having two branch portions 84 and 86 and one base portion 88. The distal ends of the two branch portions 84 and 86 are fixed to the inner side surface of the outer member 44 shown in FIG. 5 by welding, and the distal end of the base portion 88 faces the outer surface of the nozzle 25 with a gap. The base portion 88 is disposed on the downstream side of the flange 78 of the nozzle intermediate portion 72 of the nozzle 25, and is in contact with the downstream side surface of the flange 78. When the valve body 26 operates in the direction of arrow A in FIG. 5 and contacts the upstream end 25b of the nozzle 25, a force in the direction of arrow F is applied to the nozzle 25, but the flange 78 of the nozzle 25 is the first regulating member. By abutting 80, the movement of the nozzle 25 in the axial direction can be restricted. That is, the first regulating member 80 and the flange 78 of the nozzle 25 constitute an axial regulating member for the nozzle 25.

  As shown in FIG. 7B, the second restricting member 82 is made of a substantially rectangular plate material, and is disposed on the upstream side of the flange 78 of the nozzle 25 shown in FIG. The second restricting member 82 is supported by the inner side 82a on the outer side surface of the nozzle 25 and the upstream side surface of the flange 78, and the outer side portion 82b is in contact with the first restricting member 80 in the circumferential direction. Specifically, the outer portion 82 b of the second restricting member 82 is in contact with the joining portion 90 where the two branch portions 84 and 86 and the one base 88 of the first restricting member 80 merge.

  As shown in FIG. 8, a plurality of first restricting members 80 and second restricting members 82 are arranged in the circumferential direction of the nozzle 25 and are embedded in the heat insulating material 46. The presence of the heat insulating material 46 between the plurality of sets including the first and second regulating members 80 and 82 separated in the circumferential direction as described above can restrict the nozzle 25 from rotating in the circumferential direction. . That is, the first restricting member 80 and the second restricting member 82 constitute a circumferential restricting member of the nozzle 25. In this embodiment, eight first restricting members 80 and eight second restricting members 82 are provided, but the number is not limited to this.

  FIG. 5 shows the connecting portion between the first outlet protrusion 30 and the heat retaining duct 10, but the connecting portion between the inlet protrusion 28 and the exhaust duct 11 of the gas turbine, and the second outlet protrusion 32 and the bypass passage. The connecting portion between the pipes 9 and 9 has the same structure. In this way, the flange portions 28a, 30a, 32a are welded to the low temperature outer member 44, and between the flange portions 28a, 30a, 32a and the high temperature lining member 42 and the high temperature gas passage 8. Insulating material 46 is interposed. Moreover, the lining member 42 which becomes high temperature does not have a welding part. That is, the lining member 42 is a member specialized in heat resistance from high-temperature gas, and the outer lining member 44 is a member for ensuring the strength of the duct.

  FIG. 9 is an enlarged cross-sectional view showing a portion where the valve shaft 34 of the exhaust damper 7 penetrates the casing 18. FIG. 9 shows one (left side in FIG. 3) shaft penetrating portion, but the other (right side in FIG. 3) shaft penetrating portion has the same structure.

  A shaft insertion hole 92 is formed in the outer member 44 of the casing 18, and a mounting hole 94 concentric with the shaft insertion hole 92 is formed in the heat insulating material 46 and the lining member 42, and the mounting hole 94 is made of a high heat resistant material. A cylindrical rotation support member 96 is fitted. The rotation support member 96 is made of, for example, a calcium silicate pipe. The valve shaft 34 extends from the shaft insertion hole 92 of the outer member 44 to the inside of the exhaust damper 7 through the central through hole 98 of the cylindrical rotation support member 96. In other words, the rotation support member 96 is interposed between the heat insulating material 36 and the valve shaft 34, and the through hole 98 of the rotation support member 96 becomes a through hole provided in the casing 19.

  A seal structure 100 that seals the shaft insertion hole 92 and the through hole 98 is provided on the outer surface of the outer member 44. The seal structure 100 includes a ground case 102 supported by the outer member 44, a gland packing 104 that seals between the shaft insertion hole 92 and the gland case 102, and a packing presser 106 that is screwed to the gland case 102. Consists of.

  The ground case 102 is an annular member, one end surface of which is in contact with the outer surface of the outer member 44, and the valve shaft 34 is inserted through a minute gap. A gland packing 104 is packed into the gap, and the gland packing 104 is tightened from the outside by a packing presser 106 that is screwed to the gland case 102.

  The seal structure 100 is covered with a cover 108 attached to the outer surface of the outer member 44, and a bearing 110 that rotatably supports the valve shaft 34 is disposed outside the cover 108. The bearing 110 is interposed between the support member 112 fixed to the cover 108 and the valve shaft 34.

  In the above configuration, the casing 18 shown in FIG. 5 is configured by so-called internal heat insulation having the lining member 42, the outer lining member 44, and the heat insulating material 46 interposed therebetween. The construction can be performed at the factory, and the construction of the heat insulating material 46 on the site becomes unnecessary. As a result, there is no variation in the construction level due to the difference in skills of field workers, and the quality of the exhaust damper 7 is ensured. Moreover, since it is no longer left on site before the trial operation, it is possible to suppress the occurrence of rust in the bolt holes. Furthermore, since it is not necessary to apply a refractory material or a heat insulating material to the inside of the casing 18, they will not fall off or peel off.

  Further, since the outer member 44 is not exposed to the high temperature gas, deterioration of the flange portions 28a, 30a, 32a and the seal member in FIG. 2 can be suppressed. Moreover, it is not necessary to use an expensive heat-resistant metal such as a stainless steel plate or a molybdenum steel plate for the outer member 44, and the exhaust damper 7 can be manufactured at a low cost as a whole. Further, since the lining member 42 of FIG. 5 is locked to the heat insulating material 46 and is connected to the outer lining member via the heat insulating material 46 so as to be relatively movable, thermal stress generated in the lining member 42 can be suppressed. In addition, it is possible to suppress the occurrence of weld cracks by eliminating the welded portion at the location in contact with the high temperature gas.

  In addition, since the engagement piece 54 that is engaged with the end surface 46a of the heat insulating material 46 is provided at the end portion 42a of the lining member 42, the lining member 42 can be attached to the outside without providing a welding portion with a simple structure. It can be connected to the tension member 44 so as to be relatively movable.

  Movement of the nozzle 25 in the axial direction is restricted by the flange 78 and the first restriction member 80, and movement of the nozzle 25 in the circumferential direction is restricted by the first restriction member 80 and the second restriction member 82. Therefore, it is possible to suppress the heat insulating material 46 and the nozzle 25 from being displaced by the force F applied to the nozzle 25 by opening and closing the valve body 26. Further, since the flange 78 constituting the axial direction regulating member is a flange projecting radially outward from the outer peripheral surface of the nozzle 25, the movement of the nozzle 25 in the circumferential direction is regulated without adding new parts. As a result, an increase in the number of parts can be suppressed.

  As shown in FIG. 8, the first restricting member 80 and the second restricting member 82 are made of a plurality of plate members that are spaced apart from each other in the circumferential direction of the nozzle and extend in the radial direction. The position of the material 46 and the nozzle 25 can be regulated.

  As shown in FIG. 9, a rotation support member 96 forming a through hole 98 is interposed between the heat insulating material 46 and the valve shaft 34, and the through hole 98 is sealed on the outer surface of the outer member 44. A seal structure 100 is disposed, and a bearing 110 that supports the valve shaft 34 is disposed outside the seal structure 100. Since the outer member 44 is kept at a low temperature, the seal between the outer member 44 and the valve shaft 34 is easy, and the bearing 110 is not exposed to a high temperature. It's small.

  The present invention is not limited to the above-described embodiment, and various additions, modifications, or deletions can be made without departing from the gist of the present invention. For example, in the above embodiment, the exhaust damper 7 including a three-way valve has been described. However, an exhaust damper that opens and closes the high-temperature gas passage, an exhaust damper that adjusts the air volume of the high-temperature gas passage, and the like may be used. Therefore, such a thing is also included in the scope of the present invention.

7 Exhaust damper (opening / closing device)
8 Hot Gas Passage 18 Casing 20 Inlet 22 First Outlet 24 Second Outlet 25 Nozzle 26 Valve Body 34 Valve Shaft 42 Inner Member 44 Outer Member 46 Heat Insulating Material 42a End Member End 76 Inner Locking Piece Stop piece)
78 Flange (Axial regulating member)
80 first restricting member (axial restricting member, circumferential restricting member)
82 Second restriction member (circumferential restriction member)
96 Rotating support member (high heat resistant material)
98 Through-hole 100 Seal structure 110 Bearing

Claims (7)

An opening / closing device having a hot gas passage and a valve body for opening and closing the hot gas passage inside the casing,
A metal plate lining member exposed in the high-temperature gas passage, a metal plate lining member, and a flexible heat insulating material interposed therebetween,
The high-temperature gas passage opening and closing device in which the lining member is locked to the heat insulating material and is connected to the outer lining member through the heat insulating material so as to be relatively movable.   2. The hot gas passage opening and closing device according to claim 1, wherein a locking piece that protrudes outward and is locked to an end surface of the heat insulating material is provided at an end portion of the lining member. . The high-temperature gas passage opening and closing device according to claim 1 or 2, further comprising a nozzle supported by the lining member of the casing and opened and closed by the valve body;
A circumferential-direction regulating member and an axial-direction regulating member that are fixed to the outer-lining member and regulate positions of a part of the heat insulating material existing between the outer-lining member and the nozzle in the circumferential direction and the axial direction of the nozzle, respectively. ,
Opening and closing device for high temperature gas passage.   4. The hot gas passage opening / closing device according to claim 3, wherein the plurality of circumferential direction regulating members are arranged in the circumferential direction of the nozzle so as to be spaced apart from each other and made of a plurality of plates extending in the radial direction.   5. The hot gas passage opening / closing device according to claim 3 or 4, wherein the axial direction regulating member is a flange projecting radially outward from an outer peripheral surface of the nozzle. The open / close device for a hot gas passage according to claim 3, 4 or 5, comprising an inlet for the hot gas, a first outlet, and a second outlet.
An opening / closing device for a hot gas passage, wherein the valve body selectively opens and closes the first outlet and the second outlet. The hot gas passage opening and closing device according to any one of claims 1 to 6, further comprising a valve shaft fixed to the valve body and rotating through a through hole provided in the casing. A rotating support member made of a high heat-resistant material that forms the through hole between the heat insulating material and the valve shaft is interposed,
An opening / closing device for a hot gas passage, comprising: a seal structure that seals the through hole; and a bearing that is disposed outside the outer surface and supports the valve shaft.

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