WO2013118701A1 - シール構造及びこれを備える回転機械 - Google Patents
シール構造及びこれを備える回転機械 Download PDFInfo
- Publication number
- WO2013118701A1 WO2013118701A1 PCT/JP2013/052564 JP2013052564W WO2013118701A1 WO 2013118701 A1 WO2013118701 A1 WO 2013118701A1 JP 2013052564 W JP2013052564 W JP 2013052564W WO 2013118701 A1 WO2013118701 A1 WO 2013118701A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- seal structure
- abradable
- peripheral surface
- shroud
- recess
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
- F01D11/122—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part with erodable or abradable material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/90—Coating; Surface treatment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/60—Structure; Surface texture
- F05D2250/61—Structure; Surface texture corrugated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
- F05D2300/611—Coating
Definitions
- the present invention relates to a seal structure and a rotary machine including the same.
- the amount of fluid leakage can be reduced as much as possible by minimizing the clearance between the rotor and a stationary member such as a stationary blade. This is important from the viewpoint of improving the performance of rotating machinery.
- a seal structure that includes fins that protrude along the circumferential direction from the outer peripheral surface of the rotor, and a seal member that is sprayed with an abradable material having high machinability at a location facing the fins of the stationary member ( See Patent Document 1 below).
- the seal member is an annular member extending in the circumferential direction, and an abradable coating formed by spraying an abradable material is formed on the inner peripheral surface thereof.
- the present invention has been made in view of such circumstances, and provides a seal structure that can prevent the abradable material from dropping even when the abradable material is damaged.
- the seal structure includes a fin projecting from the outer peripheral surface of the rotor along the circumferential direction, and an abradable coating formed on the inner peripheral surface of the inner shroud so as to face the fin. And an uneven shape is formed on the inner peripheral surface of the inner shroud, and the abradable film is formed along the uneven shape.
- the concavo-convex shape is constituted by a recess formed from one side of the inner peripheral surface of the inner shroud and the outer peripheral surface of the abradable coating toward the inside thereof. Also good.
- the concavo-convex shape is formed by, for example, a concave portion formed from the inner peripheral surface of the inner shroud toward the inside thereof. Therefore, since the abradable film has entered the inside of the recess, the adhesive force can be reliably improved. Therefore, even when the abradable film is damaged, the abradable film can be prevented from falling off.
- the recess may be formed so as to extend in the circumferential direction.
- Such a seal structure can improve the adhesive strength of the abradable film over the circumferential direction. Therefore, even when the abradable film is damaged, the abradable film can be prevented from falling off.
- the recess may be formed so as to extend in the axial direction of the rotor.
- Such a seal structure can improve the adhesive strength of the abradable film along the axial direction. Therefore, even when the abradable film is damaged, the abradable film can be prevented from falling off.
- the recess may be formed on a boundary line between the inner shrouds adjacent in the circumferential direction.
- a recess is formed on the boundary line between adjacent inner shrouds, and an abradable film can be inserted into the recess. Therefore, when a shearing force is generated between the inner shrouds adjacent to the boundary line, it is possible to reduce the shearing force due to the penetration of the abradable film, and therefore it is possible to prevent deformation due to the torsion of the stationary blade.
- the inner peripheral surface of the inner shroud and the outer peripheral surface of the abradable coating are on one side of the inner peripheral surface of the inner shroud and the outer peripheral surface of the abradable coating.
- a second recess may be formed opposite to the recess formed in the step, and a pin member inserted between the recess and the second recess may be provided.
- the axial displacement of the inner shroud can be reduced by fitting and bonding the recess and the pin member.
- membrane can be improved by adhesion
- the concave portion extends from the inner peripheral surface of the inner shroud or the outer peripheral surface of the abradable coating toward the bottom of the concave portion in a cross section orthogonal to the extending direction of the concave portion. Therefore, it may be formed so that the width gradually increases.
- Such a seal structure can increase the adhesion area of the abradable film.
- a resistance force acts on the inclined surface of the abradable film corresponding to the surface formed toward the bottom of the recess, so that the abradable film should be bonded more firmly. Can do. Therefore, even when the abradable film is damaged, the abradable film is firmly adhered, so that the abradable film can be prevented from falling off.
- the concave portion is formed in an arc shape that swells from the inner peripheral surface of the inner shroud or the outer peripheral surface of the abradable coating in a cross section orthogonal to the extending direction of the concave portion. May be.
- the adhesive area of the abradable film can be increased, so that the adhesive force can be improved.
- the rotating machine includes the seal structure described in any one of the above.
- the seal structure according to any one of the above is provided, the abradable film is prevented from falling off even when the abradable film is damaged while performing a desired sealing function. be able to.
- the abradable film enters the concavo-convex shape portion, and can be firmly bonded by being cured and welded. Therefore, even when the abradable film is damaged, the abradable film can be prevented from falling off.
- FIG. 2 is a cross-sectional view taken along the line XX of FIG. 1 showing a stationary blade that is a constituent member of the seal structure according to the first embodiment of the present invention.
- FIG. 6 is a cross-sectional view taken along the line XX of FIG. 1 showing a stationary blade that is a constituent member of a seal structure according to a second embodiment of the present invention.
- FIG. 6 is a cross-sectional view taken along the line XX of FIG. 1 showing a stationary blade that is a constituent member of a seal structure according to a third embodiment of the present invention.
- FIG. 1 is a cross-sectional view taken along the line XX of FIG. 1 showing a stationary blade that is a constituent member of a seal structure according to a third embodiment of the present invention.
- FIG. 6 is a cross-sectional view taken along the line XX of FIG. 1 showing a stationary blade that is a constituent member of a seal structure according to a fourth embodiment of the present invention.
- FIG. 9 is a cross-sectional view taken along the line XX of FIG. 1 showing a stationary blade that is a constituent member of a seal structure according to a fifth embodiment of the present invention.
- FIG. 9 is a YY sectional view of FIG. 1 showing a stationary blade that is a constituent member of a seal structure according to a sixth embodiment of the present invention.
- FIG. 9 is a YY cross-sectional view of FIG. 1 showing a stationary blade that is a constituent member of a seal structure according to a seventh embodiment of the present invention.
- FIG. 9 is a YY sectional view of FIG. 1 showing a stationary blade that is a constituent member of a seal structure according to an eighth embodiment of the present invention. It is sectional drawing which shows the stationary blade which is a structural member of the seal structure which concerns on 8th embodiment of this invention.
- a gas turbine (rotary machine) 1 includes a compressor 2 that generates compressed air, a combustor 3 that generates a combustion gas M by mixing fuel with the compressed air generated by the compressor 2, and a combustor. And a turbine 4 that rotationally drives the combustion gas M generated in 3 as a working fluid.
- a rotor 5 is inserted into the compressor 2 and the turbine 4.
- the compressor 2 includes a compressor casing 2a through which the rotor 5 is inserted, a compressor moving blade 2b that can rotate together with the rotor 5, and a compressor stationary blade 2c fixed to the compressor casing 2a.
- a plurality of compressor blades 2b and compressor stationary blades 2c are provided radially in the circumferential direction R, respectively.
- the compressor rotor blades 2b and the compressor stationary blades 2c are alternately provided in the axial direction (axial direction) P, and each of the compressor blades 2b and the compressor stator blades 2c is provided in a plurality of stages. ing.
- the sucked air flows between the compressor stationary blades 2c and is compressed by the rotation of the compressor blades 2b on the downstream side, whereby the compressed air is generated.
- the turbine 4 includes a turbine casing 10 in which the rotor 5 is inserted, a turbine blade 20 that can rotate together with the rotor 5, and a turbine stationary blade (static blade) 30 that is fixed to the turbine casing 10.
- the turbine rotor blades 20 and the turbine stationary blades 30 extend in the radial direction Q, and are provided in a plurality in the circumferential direction R in a radial manner. Further, the turbine rotor blades 20 and the turbine stationary blades 30 are alternately provided in the axial direction P, and each of the plurality of blades provided in the circumferential direction R constitutes one stage, and a plurality of stages are provided.
- combustion gas M which is the working fluid which flowed in from the combustor 3 circulates between the turbine stationary blades 30, and the turbine blades 20 are fixed by repeatedly rotating the turbine blades 20 on the downstream side.
- the rotor 5 is rotated by applying torque.
- seal structure 7 In order to prevent the combustion gas M from leaking from the high pressure side to the low pressure side, a plurality of seal structures 7 are provided along the axial direction P.
- the seal structure 7 will be described in detail below.
- the seal structure 7 includes a plurality of fins 40 protruding from the outer peripheral surface of the rotor 5 and a turbine stationary blade 30.
- the plurality of fins 40 protrude from the outer peripheral surface of the rotor 5 along the circumferential direction R, and are arranged at intervals in the axial direction P. Further, the fin 40 has an outer peripheral surface of the rotor 5 as a base end portion 40a, and a tip end portion 40b is formed so as to narrow its width from the base end portion 40a toward the turbine stationary blade 30 side. As described above, the plurality of fins 40, 40... Are alternately arranged in the axial direction P such that the base end portion 40a and tip end portion 40b of one fin 40 and the base end portions 40a, tip end portions 40b of adjacent fins 40 are alternately arranged. It is arranged.
- the turbine vane 30 includes an inner shroud 50 provided on the rotor 5 side, an abradable coating 60 formed on the inner shroud 50, a blade body 70 extending in a radial direction from the inner shroud 50, and the blade body. And an outer shroud 80 provided at the end of 70.
- the inner shroud 50 is called a Z-type shroud, and the shape viewed from the inner side in the radial direction Q is a Z-shape. Further, the inner shroud 50 has a Z shape in order to suppress leakage of high-temperature gas from between adjacent inner shrouds 50 and to suppress twisting of the blade body 70.
- the inner shroud 50 is disposed in the axial direction P, and is disposed in contact with the inner shroud 50 adjacent in the circumferential direction R. As shown in FIG. 3, the inner peripheral surface 50 a of the inner shroud 50 is formed with an uneven shape.
- the concave portion 51 is formed so as to extend in the circumferential direction R from the inner peripheral surface 50a of the inner shroud 50 to the inside, in other words, the radial direction Q outer side.
- the recess 51 connects the shroud side base portion 51a, a pair of shroud side wall portions 51b provided at a substantially right angle from the inner peripheral surface 50a, and the pair of shroud side wall portions 51b and is provided at a substantially right angle with the shroud side wall portion 51b. And a shroud side bottom 51c.
- the abradable coating 60 is formed by spraying an abradable material on the inner peripheral surface 50a of the inner shroud 50 so as to face the fins 40 (see FIG. 2). Further, the abradable film 60 is formed along a concavo-convex shape, and in this embodiment, the abradable film 60 is sprayed from the shroud side base 51a to the shroud side bottom 51c of the recess 51 to form a convex portion 61.
- the convex portion 61 protrudes from the outer peripheral surface 60a of the abradable coating 60 toward the inside of the inner shroud 50, and includes an abradable side base portion 61a, a pair of abradable side wall portions 61b provided substantially at right angles from the outer peripheral surface 60a, It has an abradable side top portion 61c that connects the pair of abradable side wall portions 61b.
- the shroud side base 51a of the recess 51 and the abradable side base 61a of the projection 61 are bonded, the shroud side wall 51b of the recess 51 and the abradable side wall 61b of the projection 61 are bonded, and the shroud side bottom of the recess 51 51c and the abradable top portion 61c of the convex portion 61 are bonded to each other.
- a nickel-based alloy is used as the abradable material.
- the wing body 70 is formed of an abdominal side 71 constituting the abdominal side and a back side 72 constituting the back side.
- the ventral side surface 71 is curved so as to swell toward the back side surface 72
- the back side surface 72 is curved so as to swell toward the same side as the ventral side surface 71.
- the outer shroud 80 is disposed in contact with the outer shroud 80 adjacent in the axial direction P and the circumferential direction R.
- the abradable material enters the concave portion 51 formed in the inner shroud 50 as the convex portion 61 and is cured and welded, the inner shroud 50 and the abradable coating 60 are The adhesion area increases. Therefore, the inner shroud 50 and the abradable film 60 are firmly bonded to each other as the bonding area increases. Furthermore, since the recess 51 is formed so as to extend in the circumferential direction R, the adhesive force between the inner shroud 50 and the abradable film 60 can be improved over the circumferential direction R. Therefore, even when the abradable film 60 is damaged when the gas turbine 1 is operated, the abradable film 60 can be prevented from being peeled off from the inner shroud 50 and falling off.
- an abradable material can be directly provided on the inner shroud 50. Therefore, as compared with the conventional structure in which the abradable material is sprayed on the seal member provided on the inner shroud 50, the distance between the rotor 5 and the turbine stationary blade 30 can be reduced by the amount that the seal member is unnecessary. Therefore, the facility of the turbine 4 and the gas turbine 1 as a whole can be reduced in size.
- the pair of shroud side wall portions 51b of the recess 51 formed in the inner shroud 50 is formed substantially at right angles to the shroud side base portion 51a.
- the shroud side wall 251b is formed at a substantially right angle to the shroud side base 251a, but the shroud side wall 251d is formed at an acute angle with respect to the shroud side base 251a. .
- the concave portion 251 of the inner shroud 250 becomes wider as it goes from the inner peripheral surface 250a of the inner shroud 250 to the shroud side bottom portion 251c of the concave portion 251 in a cross section orthogonal to the extending direction (circumferential direction R) of the concave portion 251.
- the shroud side wall portion 251b is formed at a substantially right angle to the shroud side base portion 251a, but the shroud side wall portion 251d is formed so as to be separated from the opposing shroud side wall portion 251b toward the shroud side bottom portion 251c. Has been.
- the width 261 f at the shroud bottom 251 c is wider than the width 261 e at the shroud base 251 a of the recess 251.
- the convex part 261 of the abradable film 260 has a shape corresponding to the concave part 251, and the abradable side wall part 261d is formed so as to be separated from the abradable side wall part 261b toward the abradable side top part 261c.
- the shroud side wall portion 251d and the abradable side wall portion 261d are provided to be inclined, the adhesion area between the inner shroud 250 and the abradable coating 260 is further increased. be able to.
- a force acts on the abradable coating 260 in the radial direction Q, which is a direction to drop off, a resistance force acts on the abradable side wall portion 261d toward the outside in the radial direction Q so as to prevent the fall off.
- the inner shroud 250 and the abradable coating 260 can be bonded more firmly, even when the abradable coating 260 is damaged, the abradable coating 260 can be prevented from being peeled off from the inner shroud 250 and falling off. it can.
- the shroud side wall 251b is formed at a substantially right angle with respect to the shroud side base 251a, and the shroud side wall 251d is formed at an acute angle with respect to the shroud side base 251a.
- both the shroud side wall portions 351b and 351d are formed at an acute angle with respect to the shroud side base portion 351a.
- the concave portion 351 of the inner shroud 350 becomes wider in the cross section perpendicular to the extending direction (circumferential direction R) of the concave portion 351 from the inner peripheral surface 350a of the inner shroud 350 toward the shroud side bottom portion 351c of the concave portion 351. It is formed as follows.
- the shroud side wall portions 351b and 351d are formed so as to be separated from each other toward the shroud side bottom portion 351c.
- the width 361f of the shroud side bottom portion 351c is wider than the width 361e of the shroud side base portion 351a of the concave portion 351.
- the convex part 361 of the abradable film 360 has a shape corresponding to the concave part 351, and the abradable side wall parts 361b and 361d are formed so as to be separated from each other toward the abradable side top part 361c.
- the shroud side wall portions 351b and 351d and the abradable side wall portions 361b and 361d are provided to be inclined, so that the adhesion area between the inner shroud 350 and the abradable coating 360 is Can be further increased. Further, when a force acts on the inner side of the abradable film 360 in the radial direction Q, which is the direction of dropping, a resistance force acts on the abradable side wall portions 361b and 361d toward the outer side of the radial direction Q so as to prevent the abradable film 360 from dropping off. To do.
- the inner shroud 350 and the abradable film 360 can be bonded more firmly, even if the abradable film 360 is damaged, the abradable film 360 is prevented from being peeled off from the inner shroud 350 and falling off. Can do.
- the shroud side base portion 51a and the shroud side wall portion 51b are substantially perpendicular, and the shroud side wall portion 51b and the shroud side bottom portion 51c are also substantially perpendicular.
- the recess 451 in the seal structure 407 in the present embodiment is formed in an arc shape so as to swell from the inner peripheral surface 450a of the inner shroud 450 in a cross section orthogonal to the extending direction (circumferential direction R) of the recess 451.
- the concave portion 451 of the inner shroud 450 has a semicircular shape that swells from the inner peripheral surface 450 a toward the inside of the inner shroud 450.
- the convex portion 461 of the abradable film 460 has a shape corresponding to the concave portion 451, and has a semicircular shape that bulges outward from the outer peripheral surface 460a.
- the adhesion area between the inner shroud 450 and the abradable coating 460 can be increased, and therefore the inner shroud 450 and the abradable coating 460 can be firmly bonded. it can.
- the recess 51 is formed from the inner peripheral surface 50a side of the inner shroud 50 toward the inside thereof.
- the recess 561 is formed from the outer peripheral surface 560a of the abradable film 560 toward the inside thereof.
- the concave portion 561 connects the abradable side base portion 561a, a pair of abradable side wall portions 561b provided at a substantially right angle from the outer peripheral surface 560a, and connects the pair of abradable side wall portions 561b at a substantially right angle with the abradable side wall portion 561b. And an abradable side bottom portion 561c.
- the convex portion 551 has a shape corresponding to the concave portion 561, protrudes from the inner peripheral surface 550a of the inner shroud 550 toward the inside of the abradable coating 560, and is substantially perpendicular to the inner shroud base portion 551a and the inner peripheral surface 550a.
- the adhesion area between the inner shroud 550 and the abradable coating 560 can be increased, and thus the inner shroud 550 and the abradable coating 560 can be firmly bonded. it can. Further, since it is only necessary to selectively provide a concave portion on one of the inner shroud 550 and the abradable coating 560 and provide a convex portion on the other, the degree of freedom in design is increased.
- the recess 51 is formed so as to extend in the circumferential direction R.
- the recess 651 is formed so as to extend in the axial direction P.
- a plurality of recesses 651 are formed on the inner side in the radial direction Q of the boundary line 654 between the inner shrouds 650, 650... Adjacent to each other in the circumferential direction R, along the axial direction P, and formed with a plurality in the circumferential direction R.
- an abradable film 660 is formed as a convex portion 661 inside the concave portion 651.
- the recess 651 is formed so as to extend in the axial direction P. Therefore, the adhesive force between the inner shroud 650 and the abradable coating 660 is increased in the axial direction P. It can be improved. Further, at the boundary line 654 between the adjacent inner shrouds 650, 650..., A shearing force is generated between the inner shrouds 650, 650..., And the shearing force of the abradable film 660 entering the concave portion 651 as the convex portion 661. Can be reduced. Therefore, deformation due to twisting of the turbine stationary blade 630 can be prevented, and the stability of the gas turbine 601 itself can be improved.
- the recess 651 is formed on the inner side in the radial direction Q of the boundary line 654 between the inner shrouds 650, 650.
- the recess 751 is formed within the dimension in the axial direction P of each inner shroud 750.
- the concave portion 751 is substantially the center in the axial direction P dimension of the inner shroud 750, and is formed in plural along the axial direction P and at intervals in the circumferential direction R.
- the recess 751 is formed to extend in the axial direction P, the adhesive force between the inner shroud 750 and the abradable coating 760 is increased in the axial direction P. It can be improved.
- FIG. 10 is a YY cross-sectional view of FIG. 1 in the seal structure 807 according to the present embodiment
- FIG. 11 is a cross-sectional view of the inner shroud 850 portion of the seal structure 807 cut.
- members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.
- the recess 651 is configured only from the inner peripheral surface 650a of the inner shroud 650 formed toward the inside.
- the recesses are the recess 851 formed from the inner peripheral surface 850a of the inner shroud 850 toward the inside thereof, and the outer peripheral surface 860a of the abradable film 860 facing the recess 851.
- a second recess 862 formed toward the inside thereof.
- a pin member 890 is inserted between the recess 851 and the second recess 862.
- the concave portion 851 is formed on the inner side of the boundary line 854 between the inner shrouds 850, 850.
- a plurality are formed from the inner peripheral surface 850a toward the inside.
- the recessed part 851 is formed in two places with the space
- the said numerical value is an example and may be three places and is not limited to the said numerical value.
- the second recess 862 is abradable with an interval in the circumferential direction R on the inner side in the radial direction Q of the boundary line 854 between the inner shrouds 850, 850.
- a plurality of coatings 860 are formed from the outer peripheral surface 860a toward the inside thereof.
- the second concave portion 862 is formed at two positions with an interval in the axial direction P with respect to one inner shroud 850.
- the pin member 890 is a rod-shaped member, and one end 890a is disposed on the shroud side bottom 851c of the recess 851, and the other end 890b is disposed on the second recess 862 abradable side bottom 861c.
- the pin member 890 is inserted into the concave portion 851 of the inner shroud 850, the abradable material is sprayed to fix the pin member 890 to the concave portion 851, and the abradable film 860 is formed.
- the pin member 890 can firmly couple the adjacent inner shrouds 850, 850... In the circumferential direction R, and can reduce displacement in the axial direction P. it can. Further, when the abradable material is sprayed, the other end 890b side of the pin member 890 protrudes, so that the abradable material 820 can be welded and the abradable film 860 can be formed. Therefore, the inner shroud 850 and the abradable coating 860 can be firmly bonded via the pin member 890.
- the gas turbine is described as an example of the rotating machine, but the present invention can also be applied to other rotating machines such as a steam turbine.
- the abradable film enters the concavo-convex shape portion, and can be firmly bonded by being cured and welded. Therefore, even when the abradable film is damaged, the abradable film can be prevented from falling off.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
Description
本願は、2012年2月6日に、日本に出願された特願2012-023071号に基づき優先権を主張し、その内容をここに援用する。
ここで、シール部材は、周方向に沿って延在する環状部材であって、その内周面にはアブレーダブル材を溶射して形成されたアブレーダブル皮膜が形成されている。
ここで、ロータの回転時には、隣接する静翼の内側シュラウド同士で軸方向にせん断力が生じるため、アブレーダブル材が該せん断力を負担しなければならない。しかしながら、アブレーダブル材は切削性が高いため、静翼に直接溶射しただけのアブレーダブル材は該せん断力により破損し、さらには静翼から脱落する可能性があるため、単純に溶射するだけでは適用できない。
以下、図面を参照し、本発明の第一実施形態に係る回転機械について説明する。
本発明に係る第一実施形態について、図1を参照して説明する。ガスタービン(回転機械)1は、圧縮空気を生成する圧縮機2と、圧縮機2で生成された圧縮空気に燃料を混合して燃焼させて燃焼ガスMを生成する燃焼器3と、燃焼器3で生成された燃焼ガスMを作動流体として回転駆動するタービン4とを備える。
また、内側シュラウド50は軸方向Pに配設され、周方向Rに隣接する内側シュラウド50と互いに当接して配されている。
また、図3に示すように、内側シュラウド50の内周面50aには、凹凸形状が形成されている。本実施形態では、内側シュラウド50の内周面50aからその内部、換言すると径方向Q外側に向かって凹部51が周方向Rに延在するように形成されている。
なお、アブレーダブル材としては例えばニッケル基合金が採用される。
腹側面71は、背側面72側に向かって膨らむように湾曲しており、背側面72は、腹側面71と同じ側に向かって膨らむように湾曲している。
以下、本発明の第二実施形態に係るガスタービン201について、図4を用いて説明する。
この実施形態において、前述した実施形態で用いた部材と共通の部材には同一の符号を付して、その説明を省略する。
以下、本発明の第三実施形態に係るガスタービン301について、図5を用いて説明する。
この実施形態において、前述した実施形態で用いた部材と共通の部材には同一の符号を付して、その説明を省略する。
以下、本発明の第四実施形態に係るガスタービン401について、図6を用いて説明する。
この実施形態において、前述した実施形態で用いた部材と共通の部材には同一の符号を付して、その説明を省略する。
以下、本発明の第五実施形態に係るガスタービン501について、図7を用いて説明する。
この実施形態において、前述した実施形態で用いた部材と共通の部材には同一の符号を付して、その説明を省略する。
また、内側シュラウド550及びアブレーダブル皮膜560のいずれか一方に選択的に凹部を設けて、他方に凸部を設ければいいため、設計の自由度が広がる。
以下、本発明の第六実施形態に係るガスタービン601について、図8を用いて説明する。
この実施形態において、前述した実施形態で用いた部材と共通の部材には同一の符号を付して、その説明を省略する。
また、凹部651の内部には、アブレーダブル皮膜660が凸部661として入り込んで形成されている。
また、隣接する内側シュラウド650,650…同士の境界線654では、該内側シュラウド650,650…間のせん断力が生じるところ、アブレーダブル皮膜660が凹部651に凸部661として入り込んでいる分のせん断力を低減することができる。よって、タービン静翼630のねじれによる変形を防止することができ、ガスタービン601自体の安定性を向上させることができる。
以下、本発明の第七実施形態に係るガスタービン701について、図9を用いて説明する。
この実施形態において、前述した実施形態で用いた部材と共通の部材には同一の符号を付して、その説明を省略する。
以下、本発明の第八実施形態に係るガスタービン801について、図10,図11を用いて説明する。
ここで、図10は本実施形態に係るシール構造807における図1のY-Y断面図であり、図11はシール構造807の内側シュラウド850部分を切断した断面図である。
この実施形態において、前述した実施形態で用いた部材と共通の部材には同一の符号を付して、その説明を省略する。
なお、上記数値は一例であり、3箇所であってもよく当該数値に限定されるものではない。
また、ピン部材890は、棒状部材であり、一端890aが凹部851のシュラウド側底部851cに、他端890bが第二の凹部862アブレーダブル側底部861cに配設されている。
また、アブレーダブル材を溶射する際には、ピン部材890の他端890b側が突出しているため、アブレーダブル材の溶着を良好として、アブレーダブル皮膜860を形成することができる。よって、ピン部材890を介して、内側シュラウド850とアブレーダブル皮膜860とを強固に接着することができる。
5 ロータ
7,207,307,407,507,607,707,807 シール構造
30 タービン静翼(静翼)
40 フィン
50,250,350,450,550,650,750,850 内側シュラウド
50a,250a,350a,550a,650a,850a 内周面
51,251,351,451,561,651,751,851 凹部
60,260,360,460,560,660,760,860 アブレーダブル皮膜
60a,260a,360a,560a,860a 外周面
654,854 境界線
R 周方向
Claims (9)
- ロータの外周面から周方向に沿って突出するフィンと、
内側シュラウドの内周面に、前記フィンと対向するようにアブレーダブル皮膜が形成された静翼とを備え、
前記内側シュラウドの内周面に凹凸形状が形成されており、前記アブレーダブル皮膜が前記凹凸形状に沿って形成されているシール構造。 - 請求項1に記載のシール構造において、
前記凹凸形状は、前記内側シュラウドの内周面及び前記アブレーダブル皮膜の外周面の一方側からその内部に向かって形成された凹部により構成されているシール構造。 - 請求項2に記載のシール構造において、
前記凹部は、前記周方向に延在するように形成されているシール構造。 - 請求項2に記載のシール構造において、
前記凹部は、前記ロータの軸線方向に延在するように形成されているシール構造。 - 請求項3に記載のシール構造において、
前記凹部は、前記周方向に隣接する前記内側シュラウド同士の境界線上に形成されているシール構造。 - 請求項4に記載のシール構造において、
前記内側シュラウドの内周面及び前記アブレーダブル皮膜の外周面の一方側には、前記内側シュラウドの内周面及び前記アブレーダブル皮膜の外周面の他方側に形成された前記凹部に対向して第二の凹部が形成され、
前記凹部及び前記第二の凹部との間に挿入されたピン部材を備えるシール構造。 - 請求項3から請求項5のいずれか一項に記載のシール構造において、
前記凹部は、該凹部の延在方向に直交する断面において前記内側シュラウドの内周面又は前記アブレーダブル皮膜の外周面から該凹部の底部に向かうにしたがって幅が次第に広くなるように形成されているシール構造。 - 請求項2から請求項5のいずれか一項に記載のシール構造において、
前記凹部は、該凹部の延在方向に直交する断面において前記内側シュラウドの内周面又は前記アブレーダブル皮膜の外周面から膨らむ円弧状に形成されているシール構造。 - 請求項1から請求項7のいずれか一項に記載のシール構造を備える回転機械。
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CN201380003866.1A CN103958949B (zh) | 2012-02-06 | 2013-02-05 | 密封结构及具备该密封结构的旋转机械 |
KR1020147014047A KR101600732B1 (ko) | 2012-02-06 | 2013-02-05 | 시일 구조 및 이것을 구비하는 회전 기계 |
IN911MUN2014 IN2014MN00911A (ja) | 2012-02-06 | 2013-02-05 | |
EP13746796.5A EP2813736B1 (en) | 2012-02-06 | 2013-02-05 | Sealing structure |
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JP2012023071A JP5308548B2 (ja) | 2012-02-06 | 2012-02-06 | シール構造及びこれを備える回転機械 |
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US (1) | US20130216362A1 (ja) |
EP (1) | EP2813736B1 (ja) |
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JP5411569B2 (ja) * | 2009-05-01 | 2014-02-12 | 株式会社日立製作所 | シール構造とその制御方法 |
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- 2013-02-04 US US13/758,158 patent/US20130216362A1/en not_active Abandoned
- 2013-02-05 EP EP13746796.5A patent/EP2813736B1/en not_active Not-in-force
- 2013-02-05 CN CN201380003866.1A patent/CN103958949B/zh not_active Expired - Fee Related
- 2013-02-05 IN IN911MUN2014 patent/IN2014MN00911A/en unknown
- 2013-02-05 WO PCT/JP2013/052564 patent/WO2013118701A1/ja active Application Filing
- 2013-02-05 KR KR1020147014047A patent/KR101600732B1/ko active IP Right Grant
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KR20140083048A (ko) | 2014-07-03 |
IN2014MN00911A (ja) | 2015-04-17 |
CN103958949B (zh) | 2016-03-16 |
JP2013160313A (ja) | 2013-08-19 |
US20130216362A1 (en) | 2013-08-22 |
CN103958949A (zh) | 2014-07-30 |
EP2813736A4 (en) | 2015-11-25 |
KR101600732B1 (ko) | 2016-03-07 |
EP2813736B1 (en) | 2016-11-30 |
EP2813736A1 (en) | 2014-12-17 |
JP5308548B2 (ja) | 2013-10-09 |
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