US20090226313A1 - Turbine casing structure - Google Patents
Turbine casing structure Download PDFInfo
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- US20090226313A1 US20090226313A1 US11/344,340 US34434006A US2009226313A1 US 20090226313 A1 US20090226313 A1 US 20090226313A1 US 34434006 A US34434006 A US 34434006A US 2009226313 A1 US2009226313 A1 US 2009226313A1
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- Prior art keywords
- casing
- turbine
- eccentric shaft
- outer casing
- inner casing
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/26—Double casings; Measures against temperature strain in casings
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
- F01D25/285—Temporary support structures, e.g. for testing, assembling, installing, repairing; Assembly methods using such structures
Definitions
- This invention relates to the turbine casing structure of a turbine, such as a gas turbine or a steam turbine.
- a turbine such as an industrial gas turbine or steam turbine of a large size
- its interior is at a high temperature.
- a temperature difference between its interior and its exterior exerts a great influence.
- thermal deformation of the stationary portion occurs, causing oval deformation, etc. and thus necessitating a larger gap between the stationary side (stationary blades assembled to an inner casing to be described later) and the rotating side (moving blades assembled to a rotor).
- a structure of a turbine casing in whose interior a casing (inner casing) is further provided (namely, a double-casing structure).
- This structure has a single air layer provided between a gas channel portion, through which a high temperature gas flows, and the air outside the turbine casing.
- the inner casing has a structure supporting the blades on the stationary side, and the inner casing is supported by and fixed to an outer casing.
- FIG. 10 An example of a turbine having such a structure is a turbine having a turbine casing structure 30 as shown in FIG. 10 .
- supporting and positioning (alignment adjustment) of an inner casing (blade ring) 32 with respect to an outer casing 31 are performed by torque pins 33 in a right-and-left direction (lateral direction), and by horizontal keys 34 in an up-and-down direction (vertical direction), respectively, when viewed from the upstream side of the turbine.
- torque pins 33 in a right-and-left direction (lateral direction)
- horizontal keys 34 in an up-and-down direction (vertical direction), respectively, when viewed from the upstream side of the turbine.
- the horizontal key 34 is fixed to a parting surface 32 b of a lower-half inner casing 32 a by a bolt 35 , and has a front end portion 34 a installed between an upper liner 36 and a lower liner 37 provided in the vicinity of a parting surface 31 a of the outer casing 31 .
- FIG. 1 Another example of a turbine having the aforementioned double-casing structure is a turbine having a positioning mechanism for a turbine casing as described in Japanese Patent Application Laid-Open No. 2004-162536 (hereinafter referred to as Patent Document 1).
- Patent Document 1 an eccentric pin is inserted into an adjusting hole formed in an engine casing (outer casing)
- a trunk portion of the eccentric pin is disposed in the adjusting hole, while a front end portion of the eccentric pin eccentric with respect to the trunk portion is disposed in an adjusting groove formed in the turbine casing (inner casing) while extending in an axial direction.
- a parallel pin is mounted to whirl-stop the eccentric pin with respect to the adjusting hole, and the eccentric pin is fixed to the engine casing by a cover body disposed in contact with the head of the eccentric pin.
- Patent Document 2 discloses a flangeless casing fastening structure for fastening upper and lower casings.
- a flangeless casing fastening structure bolt holes are formed in the upper and lower casings, and a cylindrical sleeve is mounted by screwing an outside screw, which is formed in an outer periphery thereof, into a tapped hole provided in the vicinity of a joining surface at the bolt hole of the upper casing.
- a large-diameter portion to be joined to an upper end surface of the sleeve when a bolt is fastened into the bolt hole of the lower casing is formed in the bolt, and the bolts are inserted into the bolt holes to fix the upper and lower casings.
- Patent Document 3 discloses an upper-lower bolt tightening structure for coupling type 180°-divided stationary blades which fixes a stationary blade ring to a turbine casing.
- upper and lower stationary blades are integrated by bolts with holes, and keys fixed in the holes of the bolts with the holes are disposed between upper and lower liners provided in the turbine casing to fix the stationary blade ring to the turbine casing.
- the positioning mechanisms are disposed at upper and lower portions of the engine casing and the turbine casing, whereby the position in the right-and-left direction of the turbine casing with respect to the engine casing is restrained by the upper portion and the lower portion thereof.
- the turbine casing is thermally expanded, its central position is not displaced in the right-and-left direction with respect to the engine casing, and the concentric relationship between the engine casing and the turbine casing can be maintained.
- this positioning mechanism Even with the use of this positioning mechanism, however, the position in the up-and-down direction of the turbine casing with respect to the engine casing cannot be adjusted.
- the present invention has been accomplished in light of the above-described problems. It is an object of the invention to provide a turbine casing structure in which the position in the up-and-down direction of the inner casing with respect to the outer casing can be adjusted from the outside.
- An aspect of the present invention is a turbine casing structure having an outer casing, and an inner casing disposed in the outer casing, comprising:
- a fixing member disposed in engagement with the eccentric shaft, and fixed to the outer casing.
- An example of the eccentric shaft is a shaft having a shaft center on the front end side thereof and a shaft center on the head side thereof eccentric with respect to each other.
- FIG. 1 is a schematic sectional view of a turbine having a turbine casing structure according to a first embodiment of the present invention applied thereto;
- FIG. 2 is an enlarged view of a portion enclosed with a line II in FIG. 1 ;
- FIG. 3 is a view taken on line III-III in FIG. 2 ;
- FIG. 4 is a view taken along line IV in FIG. 2 ;
- FIG. 5 is an explanation drawing of a position adjusting mechanism possessed by the turbine casing structure according to the first embodiment of the present invention
- FIG. 6 is a bottom view of a cover member possessed by the turbine casing structure according to the first embodiment of the present invention.
- FIGS. 7( a ) and 7 ( b ) are views, in tabular form, showing the relationship between an engagement combination of the cover member and an eccentric shaft possessed by the turbine casing structure according to the first embodiment of the present invention, and the amount of movement in the up-and-down direction (vertical movement) of an inner casing;
- FIG. 8 is a view showing the state of assemblage of the turbine casing structure according to the first embodiment of the present invention.
- FIG. 9 is a side view of a shaft adjusting jig for the eccentric shaft which is possessed by the turbine casing structure according to the first embodiment of the present invention.
- FIG. 10 is a schematic sectional view of a turbine having a conventional turbine casing structure applied thereto.
- FIG. 11 is an enlarged view of a portion encircled with line XI in FIG. 10 .
- FIG. 1 is a schematic sectional view of a turbine having a turbine casing structure according to the first embodiment of the present invention applied thereto.
- FIG. 2 is an enlarged view of a portion enclosed with line II in FIG. 1 .
- FIG. 3 is a view taken on line III-III in FIG. 2 .
- FIG. 4 is a view taken along line IV in FIG. 2 .
- FIG. 5 is an explanation drawing of a position adjusting mechanism possessed by the turbine casing structure.
- FIG. 6 is a bottom view of a cover member possessed by the turbine casing structure.
- FIG. 7( a ) and 7 ( b ) are views, in tabular form, showing the relationship between an engagement combination of the cover member and an eccentric shaft possessed by the turbine casing structure, and the amount of vertical movement of an inner casing, FIG. 7( a ) showing a case where the eccentric position of the eccentric shaft (the position of the shaft center of a front end portion with respect to the shaft center of a head portion) is located on an upstream side, and FIG. 7( b ) showing a case where the eccentric position of the eccentric shaft is located on a downstream side.
- FIG. 8 is a view showing the state of assemblage of the turbine casing structure.
- FIG. 9 is a side view of a shaft adjusting jig for the eccentric shaft which the turbine casing structure has.
- a turbine casing structure 10 as shown in FIG. 1 , has an outer casing 1 divided into two portions, i.e., an upper portion and a lower portion, and an inner casing 2 disposed within the outer casing 1 and divided into two portions, i.e., an upper portion and a lower portion.
- torque pins (circumferential movement restraining means) 3 are mounted on the upper portion and the lower portion of the outer casing 1 .
- Position adjusting mechanisms 4 are mounted in the vicinity of a parting surface 1 a in the lower half of the outer casing 1 , and in right-hand and left-hand opposite side portions of the outer casing 1 when viewed from the upstream side of the turbine.
- a plurality of stationary blades (not shown), which are arranged between moving blades (not shown) rotatably supporting a rotor (not shown) and assembled in multiple stages to the rotor, are assembled to the inner casing 2 .
- the torque pins 3 adjust the position in the right-and-left direction of the inner casing 2 with respect to the outer casing 1 to restrain the movement in the circumferential direction of the inner casing 2 with respect to the outer casing 1 .
- the position adjusting mechanisms 4 adjust the position in the up-and-down (vertical) direction of the inner casing 2 with respect to the outer casing 1 .
- Measuring gauges 5 which measure the position of the inner casing 2 with respect to the outer casing 1 , are mounted in the vicinity of the torque pins 3 and the position adjusting mechanisms 4 .
- the position adjusting mechanism 4 has a bush 7 disposed in a concave portion 12 depressed toward the interior of the inner casing 2 , an eccentric shaft 8 which is inserted into a communication hole 1 b formed opposite the concave portion 12 of the inner casing 2 for establishing communication between the inside and outside of the casing and which has a front end 8 a located in contact with the bush 7 , and a cover member 11 as a fixing member which is disposed in contact with a head 8 b of the eccentric shaft 8 and fixed to the outer casing 1 by bolts 9 .
- a bush 7 disposed in a concave portion 12 depressed toward the interior of the inner casing 2
- an eccentric shaft 8 which is inserted into a communication hole 1 b formed opposite the concave portion 12 of the inner casing 2 for establishing communication between the inside and outside of the casing and which has a front end 8 a located in contact with the bush 7
- a cover member 11 as a fixing member which is disposed in contact with a head 8 b of
- the bush 7 is fixed into the concave portion 12 by bolts 6 and thereby inhibited from being dislodged from the concave portion 12 , and is in such a shape as to contact an upper part 12 a and a lower part 12 b of the concave portion 12 of the inner casing 2 , but not to contact side parts 12 c , 12 d of the concave portion 12 .
- the bush 7 is configured to be inhibited from moving in the up-and-down direction within the concave portion 12 , but be free to move in the right-and-left direction within the concave portion 12 .
- the cover member 11 has bolt holes 11 a for insertion of the bolts 9 , and an engaging portion 13 for engagement with an engaged portion 14 of the eccentric shaft 8 to be described later, as shown in FIGS. 2 and 4 to 6 .
- the bolt holes 11 a are formed at predetermined intervals along the outer periphery of the cover member 11 , and seven of the bolt holes 11 a are formed here.
- the engaging portion 13 of the cover member 11 is tubular, and is formed in the interior of the cover member 11 .
- the engaging portion 13 consists of convexities 13 a convex outward, and concavities 13 b located between the adjacent convexities 13 a .
- a confirmation hole 11 b is formed in the cover member 11 , and this hole 11 b makes it possible to confirm letters described on the head 8 b of the eccentric shaft 8 in correspondence with shaft convexities 14 a of the engaged portion 14 of the eccentric shaft 8 .
- the engaged portion 14 to be brought into engagement with the engaging portion 13 of the cover member 11 is formed in the head 8 b of the eccentric shaft 8 .
- the engaged portion 14 of the eccentric shaft 8 is in the shape of a gear consisting of the shaft convexities 14 a convex outward, and shaft concavities 14 b located between the adjacent shaft convexities 14 a .
- twelve each of the shaft convexities 14 a and the shaft concavities 14 b are formed.
- the shaft center C 1 of the head 8 b of the eccentric shaft 8 is eccentric by a distance L with respect to the shaft center C 2 of the front end 8 a , as shown in FIG. 4 .
- the distance L is 0.8 mm.
- the front end 8 a of the eccentric shaft 8 draws a circle of a predetermined size (i.e., the front end 8 a moves in the right-and-left direction and the up-and-down direction).
- the front end 8 a of the eccentric shaft 8 draws a circle of a predetermined size (i.e., the front end 8 a moves in the right-and-left direction and the up-and-down direction).
- the bush 7 At the front end 8 a of the eccentric shaft 8 , its movement in the right-and-left direction is cancelled by the bush 7 , but its movement in the up-and-down direction acts on the inner casing 2 via the bush 7 , so that the position in the up-and-down direction of the inner casing 2 with respect to the outer casing 1 can be adjusted from the outside.
- the work efficiency can be increased.
- One of the bolt holes, 11 a , and the confirmation hole 11 b of the cover member 11 are located in the direction of 12 o'clock, and the shaft center C 2 of the front end 8 a of the eccentric shaft 8 is located in the direction of 9 o'clock.
- the bolt hole 11 a located in the direction of 12 o'clock (the direction of the turbine casing reference axis)
- the shaft convexity 14 a located in the same direction visible through the confirmation hole 11 b ) is designated as a.
- the respective bolt holes 11 a are sequentially marked the symbols A to G counterclockwise.
- the respective shaft convexities 14 a are sequentially marked the symbols a to h and j to m counterclockwise.
- a holding plate 15 is disposed in contact with a parting surface 2 b of a lower-half inner casing 2 a .
- a bolt hole 2 c formed in the parting surface 2 b of the lower-half inner casing 2 a and a through-hole 15 a formed in the holding plate 15 are disposed in alignment with each other, and a collar 16 as a tubular body is inserted into the through-hole 15 a and the bolt hole 2 c .
- a bolt 17 is inserted into the collar 16 and the bolt hole 2 c , and a cap nut 18 is attached to the head of the bolt 17 to fix the holding plate 15 to the lower-half inner casing 2 a .
- the lower-half inner casing 2 a having the holding plate 15 fixed thereto in this manner is assembled to a lower-half outer casing 1 c.
- the eccentric shaft 8 and the cover member 11 are temporarily assembled. That is, the eccentric shaft 8 is inserted into the communication hole 1 b of the outer casing 1 , and its front end 8 a is brought into contact with the bush 7 disposed in the concave portion 12 of the inner casing 2 .
- the engaging portion 13 of the cover member 11 is engaged with the engaged portion 14 of the eccentric shaft 8 , and the cover member 11 is fixed to the outer casing 1 by the bolts 9 .
- the amount of vertical movement (movement in the up-and-down direction), which is the closest to the required amount of movement, is read from the tables described in FIGS. 7( a ), 7 ( b ), and recorded. That is, if the eccentric position of the eccentric shaft 8 is located on the upstream side when viewed from the upstream side of the turbine during temporary assemblage of the eccentric shaft 8 and the cover member 11 , the amount of vertical movement is read from the table in FIG. 7( a ) and recorded. If the eccentric position of the eccentric shaft 8 is located on the downstream side, on the other hand, the amount of vertical movement is read from the table in FIG. 7( b ) and recorded.
- the position of the inner casing 2 may be adjusted using the push-up bolts 20 .
- a stop plug (not shown) or the like is assembled into the confirmation hole 11 b of the cover member 11 .
- the position in the circumferential direction of the eccentric shaft 8 is adjusted, and fixed by the cover member 11 .
- the cover member 11 By so doing, at the front end 8 a of the eccentric shaft 8 , its movement in the right-and-left direction is cancelled by the bush 7 , but its movement in the up-and-down direction acts on the inner casing 2 via the bush 7 .
- the position in the up-and-down direction of the inner casing 2 with respect to the outer casing 1 can be adjusted from the outside. As a result, the work efficiency can be increased.
- the eccentric amount of the eccentric shaft 8 , and the combination of the engaged portion 14 of the eccentric shaft 8 and the engaging portion 13 of the cover member 11 are recorded during manufacture, whereby the turbine casing structure can be easily assembled in the same state as that during manufacture when the turbine is installed in situ. Furthermore, the position in the up-and-down direction of the inner casing 2 with respect to the outer casing 1 can be set with high accuracy. Since the position of the engaged portion 14 of the eccentric shaft 8 can be confirmed through the confirmation hole 11 b , the combination of the engaged portion 14 and the engaging portion 13 of the cover member 11 can be easily adjusted, thus increasing the work efficiency.
- the inner casing 2 can be adjusted with a rough pitch within the above range of vertical movement.
- the present invention can be used for a turbine casing structure.
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Abstract
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- a bush disposed in a concave portion formed in the inner casing;
- an eccentric shaft inserted into a communication hole formed in the outer casing, and having a front end disposed in contact with the bush; and
- a fixing member disposed in engagement with the eccentric shaft, and fixed to the outer casing.
Description
- 1. Field of the Invention
- This invention relates to the turbine casing structure of a turbine, such as a gas turbine or a steam turbine.
- 2. Description of the Related Art
- With a turbine such as an industrial gas turbine or steam turbine of a large size, its interior is at a high temperature. Thus, a temperature difference between its interior and its exterior exerts a great influence. As a result, thermal deformation of the stationary portion occurs, causing oval deformation, etc. and thus necessitating a larger gap between the stationary side (stationary blades assembled to an inner casing to be described later) and the rotating side (moving blades assembled to a rotor). To diminish the thermal influence, use is made of a structure of a turbine casing in whose interior a casing (inner casing) is further provided (namely, a double-casing structure). This structure has a single air layer provided between a gas channel portion, through which a high temperature gas flows, and the air outside the turbine casing.
- The inner casing has a structure supporting the blades on the stationary side, and the inner casing is supported by and fixed to an outer casing.
- An example of a turbine having such a structure is a turbine having a
turbine casing structure 30 as shown inFIG. 10 . With theturbine casing structure 30, supporting and positioning (alignment adjustment) of an inner casing (blade ring) 32 with respect to anouter casing 31 are performed bytorque pins 33 in a right-and-left direction (lateral direction), and byhorizontal keys 34 in an up-and-down direction (vertical direction), respectively, when viewed from the upstream side of the turbine. As shown inFIG. 11 , thehorizontal key 34 is fixed to a parting surface 32 b of a lower-half inner casing 32 a by abolt 35, and has a front end portion 34 a installed between anupper liner 36 and alower liner 37 provided in the vicinity of aparting surface 31 a of theouter casing 31. - Another example of a turbine having the aforementioned double-casing structure is a turbine having a positioning mechanism for a turbine casing as described in Japanese Patent Application Laid-Open No. 2004-162536 (hereinafter referred to as Patent Document 1). With this turbine casing positioning mechanism, an eccentric pin is inserted into an adjusting hole formed in an engine casing (outer casing) A trunk portion of the eccentric pin is disposed in the adjusting hole, while a front end portion of the eccentric pin eccentric with respect to the trunk portion is disposed in an adjusting groove formed in the turbine casing (inner casing) while extending in an axial direction. A parallel pin is mounted to whirl-stop the eccentric pin with respect to the adjusting hole, and the eccentric pin is fixed to the engine casing by a cover body disposed in contact with the head of the eccentric pin.
- Japanese Patent Application Laid-Open No. 2001-107922 (hereinafter referred to as Patent Document 2) discloses a flangeless casing fastening structure for fastening upper and lower casings. With the flangeless casing fastening structure, bolt holes are formed in the upper and lower casings, and a cylindrical sleeve is mounted by screwing an outside screw, which is formed in an outer periphery thereof, into a tapped hole provided in the vicinity of a joining surface at the bolt hole of the upper casing. A large-diameter portion to be joined to an upper end surface of the sleeve when a bolt is fastened into the bolt hole of the lower casing is formed in the bolt, and the bolts are inserted into the bolt holes to fix the upper and lower casings.
- Japanese Patent Application Laid-Open No. 1997-112204 (Patent Document 3) discloses an upper-lower bolt tightening structure for coupling type 180°-divided stationary blades which fixes a stationary blade ring to a turbine casing. With the upper-lower bolt tightening structure for coupling type 180°-divided stationary blades, upper and lower stationary blades are integrated by bolts with holes, and keys fixed in the holes of the bolts with the holes are disposed between upper and lower liners provided in the turbine casing to fix the stationary blade ring to the turbine casing.
- With the aforementioned
turbine casing structure 30, an improvement in the accuracy of setting a clearance between the rotating side and the stationary side has been desired in recent years from the aspects of improved performance and reliability. Thus, after theinner casing 32 is mounted in theouter casing 31, the clearance between theinner casing 32 and theouter casing 31 is measured. If the measured value is not within the tolerance of the design value, theinner casing 32 is taken out of theouter casing 31, and thehorizontal keys 34 are machined to optimize the clearance. Using the machinedhorizontal keys 34, theinner casing 32 is assembled again into theouter casing 31. With the conventionalturbine casing structure 30, therefore, the position in the up-and-down direction (vertical direction) of theinner casing 32 with respect to theouter casing 31 cannot be adjusted from the outside. This poses the problem of impairing the efficiency of an adjusting operation, thereby increasing the cost of the operation. - With the turbine casing positioning mechanism described in
Patent Document 1, the positioning mechanisms are disposed at upper and lower portions of the engine casing and the turbine casing, whereby the position in the right-and-left direction of the turbine casing with respect to the engine casing is restrained by the upper portion and the lower portion thereof. Thus, even if the turbine casing is thermally expanded, its central position is not displaced in the right-and-left direction with respect to the engine casing, and the concentric relationship between the engine casing and the turbine casing can be maintained. Even with the use of this positioning mechanism, however, the position in the up-and-down direction of the turbine casing with respect to the engine casing cannot be adjusted. Even if the positioning mechanisms are disposed in the vicinity of the parting surfaces of the engine casing and the turbine casing, the position in the up-and-down direction of the turbine casing with respect to the engine casing cannot be adjusted. With the turbine casing positioning mechanism, therefore, like theturbine casing structure 30, the optimal adjustment of the clearance between the engine casing and the turbine casing requires that the turbine casing be taken out of the engine casing, and the positioning mechanism and the positioning mechanism for the vertical position be machined for adjustment. This poses the problem that the position in the up-and-down direction of the turbine casing with respect to the engine casing cannot be adjusted from the outside. - With the flangeless casing fastening structure described in
Patent Document 2, the inner casings or the outer casings divided into upper and lower portions can be coupled. However, the problem arises that the position in the up-and-down direction of the inner casing with respect to the outer casing cannot be adjusted from the outside. - With the upper-lower bolt tightening structure for coupling type 180°-divided stationary blades described in
Patent Document 3, the keys fixed to the hole-formed bolts coupling the upper-half and lower-half stationary blades are disposed between the upper and lower liners provided in the turbine casing. By so doing, the inner casing can be locked at a predetermined position with respect to the outer casing. However, the adjustment of the position in the up-and-down direction of the inner casing with respect to the outer casing requires machining of the keys. This presents the problem that the position in the up-and-down direction of the inner casing with respect to the outer casing cannot be adjusted from the outside. - The present invention has been accomplished in light of the above-described problems. It is an object of the invention to provide a turbine casing structure in which the position in the up-and-down direction of the inner casing with respect to the outer casing can be adjusted from the outside.
- An aspect of the present invention is a turbine casing structure having an outer casing, and an inner casing disposed in the outer casing, comprising:
- a bush disposed in a concave portion formed in the inner casing;
- an eccentric shaft inserted into a communication hole formed in the outer casing, and having a front end disposed in contact with the bush; and
- a fixing member disposed in engagement with the eccentric shaft, and fixed to the outer casing.
- An example of the eccentric shaft is a shaft having a shaft center on the front end side thereof and a shaft center on the head side thereof eccentric with respect to each other.
- The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
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FIG. 1 is a schematic sectional view of a turbine having a turbine casing structure according to a first embodiment of the present invention applied thereto; -
FIG. 2 is an enlarged view of a portion enclosed with a line II inFIG. 1 ; -
FIG. 3 is a view taken on line III-III inFIG. 2 ; -
FIG. 4 is a view taken along line IV inFIG. 2 ; -
FIG. 5 is an explanation drawing of a position adjusting mechanism possessed by the turbine casing structure according to the first embodiment of the present invention; -
FIG. 6 is a bottom view of a cover member possessed by the turbine casing structure according to the first embodiment of the present invention; -
FIGS. 7( a) and 7(b) are views, in tabular form, showing the relationship between an engagement combination of the cover member and an eccentric shaft possessed by the turbine casing structure according to the first embodiment of the present invention, and the amount of movement in the up-and-down direction (vertical movement) of an inner casing; -
FIG. 8 is a view showing the state of assemblage of the turbine casing structure according to the first embodiment of the present invention; -
FIG. 9 is a side view of a shaft adjusting jig for the eccentric shaft which is possessed by the turbine casing structure according to the first embodiment of the present invention; -
FIG. 10 is a schematic sectional view of a turbine having a conventional turbine casing structure applied thereto; and -
FIG. 11 is an enlarged view of a portion encircled with line XI inFIG. 10 . - The best mode for putting the turbine casing structure according to the present invention into practice will be described in detail based on the following embodiments with reference to the accompanying drawings.
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FIG. 1 is a schematic sectional view of a turbine having a turbine casing structure according to the first embodiment of the present invention applied thereto.FIG. 2 is an enlarged view of a portion enclosed with line II inFIG. 1 .FIG. 3 is a view taken on line III-III inFIG. 2 .FIG. 4 is a view taken along line IV inFIG. 2 .FIG. 5 is an explanation drawing of a position adjusting mechanism possessed by the turbine casing structure.FIG. 6 is a bottom view of a cover member possessed by the turbine casing structure.FIGS. 7( a) and 7(b) are views, in tabular form, showing the relationship between an engagement combination of the cover member and an eccentric shaft possessed by the turbine casing structure, and the amount of vertical movement of an inner casing,FIG. 7( a) showing a case where the eccentric position of the eccentric shaft (the position of the shaft center of a front end portion with respect to the shaft center of a head portion) is located on an upstream side, andFIG. 7( b) showing a case where the eccentric position of the eccentric shaft is located on a downstream side.FIG. 8 is a view showing the state of assemblage of the turbine casing structure.FIG. 9 is a side view of a shaft adjusting jig for the eccentric shaft which the turbine casing structure has. - A
turbine casing structure 10, as shown inFIG. 1 , has anouter casing 1 divided into two portions, i.e., an upper portion and a lower portion, and aninner casing 2 disposed within theouter casing 1 and divided into two portions, i.e., an upper portion and a lower portion. When viewed from the upstream side of a turbine, torque pins (circumferential movement restraining means) 3 are mounted on the upper portion and the lower portion of theouter casing 1.Position adjusting mechanisms 4 are mounted in the vicinity of a parting surface 1 a in the lower half of theouter casing 1, and in right-hand and left-hand opposite side portions of theouter casing 1 when viewed from the upstream side of the turbine. A plurality of stationary blades (not shown), which are arranged between moving blades (not shown) rotatably supporting a rotor (not shown) and assembled in multiple stages to the rotor, are assembled to theinner casing 2. - The torque pins 3 adjust the position in the right-and-left direction of the
inner casing 2 with respect to theouter casing 1 to restrain the movement in the circumferential direction of theinner casing 2 with respect to theouter casing 1. Theposition adjusting mechanisms 4 adjust the position in the up-and-down (vertical) direction of theinner casing 2 with respect to theouter casing 1. Measuring gauges 5, which measure the position of theinner casing 2 with respect to theouter casing 1, are mounted in the vicinity of the torque pins 3 and theposition adjusting mechanisms 4. - As shown in
FIGS. 2 to 4 , theposition adjusting mechanism 4 has abush 7 disposed in aconcave portion 12 depressed toward the interior of theinner casing 2, aneccentric shaft 8 which is inserted into acommunication hole 1 b formed opposite theconcave portion 12 of theinner casing 2 for establishing communication between the inside and outside of the casing and which has afront end 8 a located in contact with thebush 7, and acover member 11 as a fixing member which is disposed in contact with ahead 8 b of theeccentric shaft 8 and fixed to theouter casing 1 bybolts 9. As shown inFIG. 3 , thebush 7 is fixed into theconcave portion 12 bybolts 6 and thereby inhibited from being dislodged from theconcave portion 12, and is in such a shape as to contact anupper part 12 a and alower part 12 b of theconcave portion 12 of theinner casing 2, but not to contactside parts concave portion 12. Thus, thebush 7 is configured to be inhibited from moving in the up-and-down direction within theconcave portion 12, but be free to move in the right-and-left direction within theconcave portion 12. - The
cover member 11 has bolt holes 11 a for insertion of thebolts 9, and an engagingportion 13 for engagement with an engagedportion 14 of theeccentric shaft 8 to be described later, as shown inFIGS. 2 and 4 to 6. The bolt holes 11 a are formed at predetermined intervals along the outer periphery of thecover member 11, and seven of the bolt holes 11 a are formed here. The engagingportion 13 of thecover member 11 is tubular, and is formed in the interior of thecover member 11. The engagingportion 13 consists of convexities 13 a convex outward, andconcavities 13 b located between theadjacent convexities 13 a. In the engagingportion 13, twelve of theconvexities 13 a and twelve of theconcavities 13 b are formed. Aconfirmation hole 11 b is formed in thecover member 11, and thishole 11 b makes it possible to confirm letters described on thehead 8 b of theeccentric shaft 8 in correspondence with shaft convexities 14 a of the engagedportion 14 of theeccentric shaft 8. - As shown in
FIG. 5 , the engagedportion 14 to be brought into engagement with the engagingportion 13 of thecover member 11 is formed in thehead 8 b of theeccentric shaft 8. The engagedportion 14 of theeccentric shaft 8 is in the shape of a gear consisting of the shaft convexities 14 a convex outward, and shaft concavities 14 b located between the adjacent shaft convexities 14 a. In the engagedportion 14, twelve each of the shaft convexities 14 a and the shaft concavities 14 b are formed. However, the shaft center C1 of thehead 8 b of theeccentric shaft 8 is eccentric by a distance L with respect to the shaft center C2 of thefront end 8 a, as shown inFIG. 4 . Here, the distance L is 0.8 mm. - Thus, according to the
eccentric shaft 8 having such a shape, when theeccentric shaft 8 is rotated, thefront end 8 a of theeccentric shaft 8 draws a circle of a predetermined size (i.e., thefront end 8 a moves in the right-and-left direction and the up-and-down direction). At thefront end 8 a of theeccentric shaft 8, its movement in the right-and-left direction is cancelled by thebush 7, but its movement in the up-and-down direction acts on theinner casing 2 via thebush 7, so that the position in the up-and-down direction of theinner casing 2 with respect to theouter casing 1 can be adjusted from the outside. As a result, the work efficiency can be increased. - One of the bolt holes, 11 a, and the
confirmation hole 11 b of thecover member 11 are located in the direction of 12 o'clock, and the shaft center C2 of thefront end 8 a of theeccentric shaft 8 is located in the direction of 9 o'clock. In this state, thebolt hole 11 a located in the direction of 12 o'clock (the direction of the turbine casing reference axis) is designated as A, and the shaft convexity 14 a located in the same direction (visible through theconfirmation hole 11 b) is designated as a. The respective bolt holes 11 a are sequentially marked the symbols A to G counterclockwise. Similarly, the respective shaft convexities 14 a are sequentially marked the symbols a to h and j to m counterclockwise. - The procedure for assembling the
turbine casing structure 10 according to the first embodiment of the present invention will be described below. - (1) First, as shown in
FIG. 8 , a holdingplate 15 is disposed in contact with aparting surface 2 b of a lower-halfinner casing 2 a. Also, a bolt hole 2 c formed in theparting surface 2 b of the lower-halfinner casing 2 a and a through-hole 15 a formed in the holdingplate 15 are disposed in alignment with each other, and acollar 16 as a tubular body is inserted into the through-hole 15 a and the bolt hole 2 c. Then, abolt 17 is inserted into thecollar 16 and the bolt hole 2 c, and acap nut 18 is attached to the head of thebolt 17 to fix the holdingplate 15 to the lower-halfinner casing 2 a. The lower-halfinner casing 2 a having the holdingplate 15 fixed thereto in this manner is assembled to a lower-halfouter casing 1 c.
(2) Then, as shown inFIGS. 2 and 8 , theeccentric shaft 8 and thecover member 11 are temporarily assembled. That is, theeccentric shaft 8 is inserted into thecommunication hole 1 b of theouter casing 1, and itsfront end 8 a is brought into contact with thebush 7 disposed in theconcave portion 12 of theinner casing 2. The engagingportion 13 of thecover member 11 is engaged with the engagedportion 14 of theeccentric shaft 8, and thecover member 11 is fixed to theouter casing 1 by thebolts 9. At this time, the position of the symbol d of the eccentric shaft 8 (eccentric position of the eccentric shaft 8) is confirmed.
(3) The current combination of the engagedportion 14 of theeccentric shaft 8 and the engagingportion 13 of thecover member 11 is recorded.
(4) Then, the holdingplate 15, thecollar 16 and thecap nut 18 are detached from the lower-halfinner casing 2 a, an upper-half inner casing is assembled to the lower-halfinner casing 2 a, and an upper-half outer casing is assembled to the lower-halfouter casing 1 c.
(5) Then, thecover member 11 is detached and, as shown inFIG. 9 , ashaft adjusting jig 19 capable of adjusting the position of theeccentric shaft 8 is assembled to theeccentric shaft 8. - Next, an explanation will be offered for the procedure for adjusting the position in the up-and-down direction of the
inner casing 2 by theposition adjusting mechanism 4 possessed by the turbine casing structure according to the first embodiment of the present invention. - (i) The amount of vertical movement (movement in the up-and-down direction), which is the closest to the required amount of movement, is read from the tables described in
FIGS. 7( a), 7(b), and recorded. That is, if the eccentric position of theeccentric shaft 8 is located on the upstream side when viewed from the upstream side of the turbine during temporary assemblage of theeccentric shaft 8 and thecover member 11, the amount of vertical movement is read from the table inFIG. 7( a) and recorded. If the eccentric position of theeccentric shaft 8 is located on the downstream side, on the other hand, the amount of vertical movement is read from the table inFIG. 7( b) and recorded.
(ii) The current position of theinner casing 2 is measured with the measuringgauge 5, and recorded.
(iii) Then, theinner casing 2 is supported by push-upbolts 20, the push-upbolts 20 are fixed to theouter casing 1, and theeccentric shaft 8 and thecover member 11 are detached from theouter casing 1.
(iv) Then, the amount of vertical movement is confirmed and, with the measuring gauge being seen, theinner casing 2 is moved by the push-upbolts 20.
(v) Then, theeccentric shaft 8 and thecover member 11 are assembled so that their combination coincides with the engagement combination No. recorded in (i). If it is difficult to assemble theeccentric shaft 8 and thecover member 11 as in the tabulated combination, however, the position of theinner casing 2 may be adjusted using the push-upbolts 20.
(vi) Upon completion of the operation for adjusting the position in the up-and-down direction of theinner casing 2 with respect to theouter casing 1, a stop plug (not shown) or the like is assembled into theconfirmation hole 11 b of thecover member 11. - According to the
turbine casing structure 10 concerned with the first embodiment of the present invention, therefore, the position in the circumferential direction of theeccentric shaft 8 is adjusted, and fixed by thecover member 11. By so doing, at thefront end 8 a of theeccentric shaft 8, its movement in the right-and-left direction is cancelled by thebush 7, but its movement in the up-and-down direction acts on theinner casing 2 via thebush 7. Thus, the position in the up-and-down direction of theinner casing 2 with respect to theouter casing 1 can be adjusted from the outside. As a result, the work efficiency can be increased. Moreover, the eccentric amount of theeccentric shaft 8, and the combination of the engagedportion 14 of theeccentric shaft 8 and the engagingportion 13 of thecover member 11 are recorded during manufacture, whereby the turbine casing structure can be easily assembled in the same state as that during manufacture when the turbine is installed in situ. Furthermore, the position in the up-and-down direction of theinner casing 2 with respect to theouter casing 1 can be set with high accuracy. Since the position of the engagedportion 14 of theeccentric shaft 8 can be confirmed through theconfirmation hole 11 b, the combination of the engagedportion 14 and the engagingportion 13 of thecover member 11 can be easily adjusted, thus increasing the work efficiency. - The above descriptions have been offered in connection with the use of the
cover member 11 which is disposed in engagement with thehead 8 b of theeccentric shaft 8 and is fixed to theouter casing 1. However, any member, which can engage and stop theeccentric shaft 8 and can be fixed to theouter casing 1, is acceptable. If the eccentric amount of theeccentric shaft 8 is increased, the range of vertical movement of theinner casing 2 with respect to theouter casing 1 can be expanded. If the numbers of the convexities and the concavities of the engagingportion 13 of thecover member 11 and the convexities and the concavities of the engagedportion 14 of theeccentric shaft 8 are increased, theinner casing 2 can be adjusted with a fine pitch within the above range of vertical movement. If the numbers of the convexities and the concavities of the engagingportion 13 of thecover member 11 and the convexities and the concavities of the engagedportion 14 of theeccentric shaft 8 are decreased, theinner casing 2 can be adjusted with a rough pitch within the above range of vertical movement. - As described above, the present invention can be used for a turbine casing structure.
- The invention thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005142140A JP4801373B2 (en) | 2005-05-16 | 2005-05-16 | Turbine cabin structure |
JP2005-142140 | 2005-05-16 |
Publications (2)
Publication Number | Publication Date |
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US7581922B1 US7581922B1 (en) | 2009-09-01 |
US20090226313A1 true US20090226313A1 (en) | 2009-09-10 |
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US11/344,340 Active 2027-07-02 US7581922B1 (en) | 2005-05-16 | 2006-02-01 | Turbine casing structure |
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US (1) | US7581922B1 (en) |
JP (1) | JP4801373B2 (en) |
CN (1) | CN100400801C (en) |
DE (1) | DE102006007088A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
CN1865667A (en) | 2006-11-22 |
DE102006007088A1 (en) | 2006-11-23 |
JP2006316749A (en) | 2006-11-24 |
CN100400801C (en) | 2008-07-09 |
US7581922B1 (en) | 2009-09-01 |
JP4801373B2 (en) | 2011-10-26 |
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