WO2014010287A1 - 軸流排気タービン - Google Patents
軸流排気タービン Download PDFInfo
- Publication number
- WO2014010287A1 WO2014010287A1 PCT/JP2013/061361 JP2013061361W WO2014010287A1 WO 2014010287 A1 WO2014010287 A1 WO 2014010287A1 JP 2013061361 W JP2013061361 W JP 2013061361W WO 2014010287 A1 WO2014010287 A1 WO 2014010287A1
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- WO
- WIPO (PCT)
- Prior art keywords
- partition wall
- inner partition
- upstream
- downstream
- key
- Prior art date
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- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000005192 partition Methods 0.000 claims description 259
- 238000011144 upstream manufacturing Methods 0.000 claims description 116
- 230000002093 peripheral effect Effects 0.000 claims description 22
- 230000004888 barrier function Effects 0.000 abstract 2
- 230000003628 erosive effect Effects 0.000 description 9
- 230000008439 repair process Effects 0.000 description 9
- 238000011084 recovery Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 240000001973 Ficus microcarpa Species 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
-
- 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
-
- 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
- F01D25/243—Flange connections; Bolting arrangements
-
- 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
- F01D25/246—Fastening of diaphragms or stator-rings
-
- 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
- F01D25/30—Exhaust heads, chambers, or the like
-
- 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
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
-
- 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
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/602—Drainage
-
- 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
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/608—Aeration, ventilation, dehumidification or moisture removal of closed spaces
Definitions
- the present invention relates to an axial exhaust turbine in which steam having passed through a cascade is exhausted in the axial direction of the turbine, and more particularly to an axial exhaust turbine having a mechanism for draining a drain from a steam passage in which the cascade is disposed.
- Patent Document 1 discloses a configuration in which slits are provided along the circumferential direction in an outer ring on which a stator blade is held, so that drain in steam is discharged from the slits to the outside of the steam passage. It has become.
- the steam leaving the final stage moving blade of the low pressure chamber is guided to the flow guide, flows downward, and is sucked by the condenser. Therefore, for example, the drain collected from the steam passage by the slit described in Patent Document 1 has a pressure difference between the inlet and the outlet of the through hole only by providing the through hole for drain discharge in the platform attached to the low pressure casing. Drain is led to the condenser.
- an axial exhaust turbine that discharges the steam that has passed through a cascade in the axial direction of the turbine as a condensate-type steam turbine.
- the axial flow exhaust turbine can reduce the exhaust loss (pressure loss due to the exhaust), so it is possible to maintain high energy efficiency, and there is no need to install a condenser at the lower part of the turbine.
- an exhaust chamber is provided on an outlet side of a casing of a casing enclosing a plurality of blades and vanes arranged in a row, that is, on the downstream side in the axial direction of the turbine.
- a condenser is provided on the further axial downstream side of the exhaust chamber, and the exhaust chamber and the condenser communicate with each other.
- the condenser since the condenser is disposed in the axial direction in line with the exhaust chamber, how to discharge the drain from the steam passage becomes a problem.
- Patent Document 2 as a drainage device applied to an axial flow exhaust turbine, it has a drain hole provided in a platform on which a final stage stationary blade is supported, a pocket communicating with the drain hole, and a pocket and an exhaust A configuration is disclosed in which the chamber is in communication with a plurality of pipes. According to this device, the drain in the steam passage is sucked by the negative pressure of the exhaust chamber connected to the condenser, and is led to the exhaust chamber through the drain hole, the pocket and the plurality of pipes, It has reached the condenser.
- At least some embodiments of the present invention can discharge drains from the steam passage smoothly, and can reduce axial flow and reduce the cost of repair when erosion occurs, and can save space. To provide a turbine.
- An axial flow exhaust turbine is provided on a steam passage in which moving blades and stator blades are arranged, and on the downstream side of the steam passage, and the steam from the steam passage along the turbine axial direction.
- a drain flow passage is formed between the partition wall and through which the drain collected from the steam passage can pass.
- the inner partition wall may be provided over the entire exhaust chamber or may be partially provided to the exhaust chamber.
- the drain contained in the steam is not the wall surface of the vehicle interior but the inner partition wall disposed on the inner wall thereof. It will collide. Therefore, the damage caused by the erosion can stay in the inner bulkhead and prevent the damage to the passenger compartment itself. Therefore, it is not necessary to replace the entire compartment at the time of repair, and only the inner partition wall needs to be replaced, so that the repair operation becomes easy, and the cost for the repair can be suppressed inexpensively. Further, since the space formed between the casing and the inner partition is used as the drain flow path, the drain collected from the steam passage can be discharged smoothly. Further, as in Patent Document 2, there is no need to provide a pipe for leading a drain to the outside of the vehicle compartment, so it is possible to save the space of the turbine and to improve the freedom of layout.
- the axial flow exhaust turbine further includes a plurality of supports projecting from the casing to the inner peripheral side, and the inner partition is supported by the casing via the plurality of supports. It is also good.
- the inner partition wall can be stably supported on the vehicle compartment by supporting the inner partition wall on the vehicle compartment through the plurality of support portions protruding from the vehicle compartment to the inner circumferential side.
- the drain may be led to the drain channel by passing between the support rods constituting the adjacent supports.
- the axial flow exhaust turbine further includes an annular member protruding from the casing to the inner circumferential side and provided with an opening through which the drain can pass, and the inner partition wall passes through the annular member. It may be supported by the casing. According to the axial flow exhaust turbine, the inner partition wall is supported on the entire circumferential direction with respect to the vehicle compartment via the annular member, so that the inner partition wall can be more stably fixed to the vehicle compartment . Further, since the annular member is provided with an opening through which the drain can pass, the drain collected from the passage can be smoothly led to the drain passage.
- a fitting groove having a step in the axial direction of the turbine is provided in one of the member on the vehicle compartment side and the member on the inner partition wall side, and the member on the vehicle compartment side and the member on the inner partition wall The other may be provided with a protrusion fitted in the fitting groove, and the fitting groove and the protrusion may be fitted.
- the fitting groove provided in one of the member on the vehicle compartment side and the member on the inner partition side is fitted with the projecting part provided on the other.
- the compartment includes an upper half compartment and a lower half compartment that can be divided in a horizontal division plane
- the inner partition wall is an upper half division wall and a lower half partition wall that can be divided in the horizontal division plane.
- a first key groove formed across the member on the upper half vehicle compartment side and the upper half partition wall in the horizontal division plane, and a member on the lower half vehicle compartment side and the lower half partition wall The first key and the second key may be fitted to the second key groove formed to overlap with each other.
- the first key groove formed across the member on the upper half vehicle chamber side and the upper half partition wall, and the member on the lower half vehicle chamber side and the lower half partition wall are formed to prevent the circumferential movement of the upper half partition wall and the lower half partition wall by fitting the first key and the second key respectively to the first key groove and the second key groove. It is possible to do that.
- the first key may be fastened to the member on the upper half vehicle compartment side, and the first key may support the load of the upper half partition wall.
- the upper half partition wall is supported by the member on the upper half vehicle compartment side via the first key, and the falling of the upper half partition wall can be prevented.
- the first key groove includes an upstream first key groove disposed across the upstream upper half partition wall and the upper half vehicle compartment side member, and the downstream upper half partition wall
- the upstream first key groove is formed by the downstream first key groove disposed across the upper half vehicle chamber side member, and the upstream first key is fitted in the upstream first key groove, and the downstream first key groove is engaged.
- the downstream first key is engaged
- the second key groove includes an upstream second key groove disposed across the upstream lower half partition wall and the lower half vehicle compartment side member, and the lower half partition wall and lower half vehicle chamber on the downstream side.
- a downstream second key groove disposed across the side member, the upstream second key being fitted in the upstream second key groove, and the downstream second key being disposed in the downstream second key groove May be fitted.
- the inner partition wall may be divided into two or more segments at least along a plane perpendicular to the turbine axial direction.
- the inner partition may be divided into two by a plane perpendicular to the axial direction of the turbine. This facilitates replacement of the damaged segment (upstream inner partition).
- the upstream inner partition disposed on the upstream side may be detachably attached to the first support structure from the axial downstream side.
- the downstream inner partition wall disposed downstream of the steam passage with respect to the upstream inner partition wall protrudes from the vehicle compartment toward the inner circumferential side. It may be supported by the vehicle compartment via a support structure. As a result, the upstream inner partition wall can be separated and the downstream inner partition wall can be independently attached to or removed from the vehicle compartment, which facilitates maintenance.
- the upstream inner partition may include a positioning member including two members having an eccentric structure.
- the second support structure may include an adjusting plate capable of radially positioning the downstream inner partition wall.
- the inner partition wall facing the exhaust chamber is provided on the inner peripheral side of the vehicle compartment, damage to the vehicle compartment itself due to erosion can be prevented. There is no need to replace it. Furthermore, since only the inner partition wall needs to be replaced, the repair work becomes easy, and the cost for the repair can be reduced at a low price. Further, since the space formed between the casing and the inner partition wall is used as the drain flow path, drain collected from the steam passage can be discharged smoothly, and space saving of the turbine can be further achieved. The freedom of layout can also be improved.
- FIG. 2 is a cross-sectional view of the axial flow exhaust turbine shown in FIG.
- FIG. 2 is a cross-sectional view of the axial flow exhaust turbine shown in FIG. It is an important section sectional view showing the circumference of the inner partition of an axial flow exhaust turbine concerning a first embodiment.
- FIG. 2 shows the upstream support structure of the axial flow exhaust turbine which concerns on 1st embodiment.
- It is the figure which looked at the upstream support structure of FIG. 5 from the D direction.
- FIG. 10 is a cross-sectional view of the axial flow exhaust turbine shown in FIG.
- H section enlarged view of the axial flow exhaust turbine shown in FIG. It is a perspective view showing an annular member concerning a first embodiment and a second embodiment.
- the upstream side refers to the moving blade side (left side on the paper surface of FIG. 1) when the steam S flows from the moving blade 12 side toward the exhaust chamber 8 side, and the downstream side is exhaust We say room side (the right side on the paper of FIG. 1).
- the turbine axial direction indicates the direction in which the turbine axis L shown in FIG. 1 is arranged (the direction in which the steam S flows from the upstream side to the downstream side of the exhaust chamber), and the radial direction is perpendicular to the turbine axial direction
- the circumferential direction means the direction of rotation around the turbine axis L.
- First Embodiment 1 is a cross-sectional view showing the entire configuration of an axial flow exhaust turbine according to a first embodiment
- FIG. 2 is a cross-sectional view of the axial flow exhaust turbine shown in FIG. 1 along line AA
- FIG. 3 is an axis shown in FIG.
- FIG. 4 is a cross-sectional view taken along line B-B of the flow exhaust turbine
- FIG. 4 is a cross-sectional view of an essential part showing the periphery of the inner partition of the axial flow exhaust turbine. 4 shows a view of the same cross section (cross section in the vertical direction) as FIG. As shown in FIG.
- the axial flow exhaust turbine 1 is provided downstream of the rotor 2, the cascade 4 disposed around the rotor 2, the steam passage 6 passing through the cascade 4, and the steam passage 6. It has an exhaust chamber 8 and a passenger compartment 10 having a steam passage 6 and an exhaust chamber 8 therein.
- the rotor 2 is rotatably supported with respect to the casing 10.
- a plurality of moving blades 12 are provided on the outer peripheral surface of the disk 3 of the rotor 2, and a plurality of stationary blades 14 are provided around the rotor 2 so as to face the plurality of moving blades 12. Is formed.
- the moving blades 12 are provided in a large number radially outward from the outer peripheral surface of the disk 3, and are mounted in multiple stages at intervals along the turbine axial direction L.
- the stator vanes 14 are radially supported by the outer shroud 16 (also referred to as blade root ring) and the inner shroud 18 at the opposite ends thereof to the vehicle compartment 10 and provided in a plurality of radial directions. It is attached.
- the exhaust chamber 8 is provided downstream of the steam passage 6 and is a space for discharging the steam S from the steam passage 6 along the axial direction L of the turbine.
- a condenser (not shown) is provided downstream of the exhaust chamber 8 in the turbine axial direction L, and the steam S having passed through the exhaust chamber 8 is introduced into the condenser.
- the condenser is maintained at a negative pressure by being evacuated.
- the passenger compartment 10 is provided to form the steam passage 6 and the exhaust chamber 8.
- the casing 10 has an upper half casing 10A and a lower half casing 10B divided up and down in the horizontal division surface 11, and these are fastened together by the flanges 10A1 and 10B1. It forms a substantially enclosed space.
- turbine internal members such as the cascade 4 and the rotor 2 are omitted.
- the casing 10 has a shape in which the diameter of the casing 10 is expanded toward the downstream side in the turbine axial direction L, and at least the upper half casing 10A is divided in the turbine axial direction L It shows the configuration.
- the casing 10 is divided into a first casing 20 forming the steam passage 6 and a second casing 22 forming the exhaust chamber 8 at the vertical dividing surface 24 orthogonal to the axial direction L of the turbine. There is.
- the end faces of the first casing 20 and the second casing 22 on the divided surface 24 side are in contact with each other, and the first casing 20 and the second casing 22 are fastened by bolts 25.
- the casing 10 is further divided into a second casing 22 forming the exhaust chamber 8 and a third casing (not shown) on the condenser side on the downstream side of the dividing surface 24 in the turbine axial direction L. It may be As a result, the upper half casing 10A of the second casing 22 becomes removable, and the inside of the casing can be easily accessed for the purpose of maintenance and the like.
- the compartment 10 may be configured integrally with the part forming the steam passage 6 and the exhaust chamber 8.
- the steam S introduced into the steam passage 6 expands as it passes through the steam passage 6 to increase its speed, and after the rotor 2 is rotated, the exhaust chamber 8 Flow into
- the temperature and pressure of the steam S decrease, the steam S becomes wet steam, and drain occurs.
- a drain discharge mechanism as described below is provided for the purpose of drain discharge and erosion damage prevention.
- the axial flow exhaust turbine 1 is provided on the inner peripheral side of the casing 10 (10A, 10B), and an inner partition wall 30 (30A, 30B) facing the exhaust chamber 8; A drain passage 34 formed between the chamber 10 and the inner partition wall 30 is further provided.
- the inner partition wall 30 is provided on the outlet side of the cascade 4, that is, in the vicinity of the final stage moving blade 12 a to the exhaust chamber 8. At this time, the inner partition wall 30 may be provided over the entire exhaust chamber 8 or may be partially provided to the exhaust chamber 8.
- the inner partition wall 30 when the inner partition wall 30 is partially provided to the exhaust chamber 8, it is preferable that the inner partition wall 30 be provided at least on the inlet side of the exhaust chamber 8 so that the partition wall 30 also functions as the drain passage 34.
- the inner partition wall 30 may have a shape in which the diameter increases toward the downstream side in the turbine axial direction L. Note that, for the purpose of reinforcing the inner partition wall 30, a plurality of ribs 32 formed along the turbine axial direction L may be provided on the outer peripheral surface of the inner partition wall 30 in the circumferential direction.
- the drain collected in the steam passage 6 is introduced into the drain passage 34.
- the steam passage 6 may be provided with a steam recovery unit that recovers the steam in the passage 6 and guides the steam to the drain passage 34.
- An example of the steam recovery unit is shown in FIG.
- a slit 60 is provided on the outer peripheral side of the steam inflow end of the final stage moving blade 12 a as a steam recovery unit.
- the drain accumulated on the inner wall of the outer shroud 16 flows downstream due to the flow of steam, is discharged from the slit 60 to the outside of the steam passage 6, and is introduced into the drain passage 34 in communication with the slit 60. It has become.
- the drain hole 62 may be provided in the outer shroud 16 of the final stage stationary blade 14a.
- the drain generated near the final stage blade row is led to the annular passage 64 formed outward of the hole 62 through the drain hole 62 and introduced from the annular passage 64 to the drain passage 34 communicating with the passage 64. It is supposed to be Then, the drain introduced from the steam recovery unit into the drain passage 34 passes through the drain passage 34 and is discharged to the downstream side of the exhaust chamber 8.
- the inner partition wall 30 facing the exhaust chamber 8 is provided on the inner peripheral side of the passenger compartment 10, so that damage to the passenger compartment 10 itself due to erosion can be prevented. There is no need to replace it. Furthermore, since only the inner partition wall 30 needs to be replaced, the repair work becomes easy, and the cost for the repair can be reduced at a low cost. In addition, since the space formed between the casing 10 and the inner partition wall 30 is used as the drain passage 34, the drain collected from the steam passage 6 can be discharged smoothly, and the space saving of the turbine is further achieved. And the freedom of layout can be improved.
- FIGS. 2 to 7. 5 is an enlarged view of a portion C of FIG. 2 showing the upstream support structure of the axial flow exhaust turbine
- FIG. 6 is a view of the upstream support structure of FIG. 5 seen from the D direction
- FIG. It is a figure of the downstream support structure corresponding to the upstream support structure.
- the axial flow exhaust turbine 1 according to the present embodiment further includes the upstream side support structure 40 (40A, 40B) and the downstream side support structure 50 (50A, 50B) that support the inner partition wall 30 on the vehicle compartment 10 side. Good.
- the upstream support structure 40 is disposed upstream of the turbine axial direction L
- the downstream support structure 50 is disposed downstream of the upstream support structure 40.
- the upstream support structure 40 (40A, 40B) has a plurality of support rods 41 protruding inward from the compartment 10 (10A, 10B).
- the inner partition wall 30 (30A, 30B) is supported by the passenger compartment 10 via a support rod 41 that constitutes the support portion of the present invention.
- a plurality of support rods 41 are radially provided between the passenger compartment 10 and the inner partition wall 30.
- a gap 36 may be provided between adjacent support rods 41 so that drains can pass therethrough.
- the downstream side support structure 50 (50A, 50B) has a plurality of support rods 51 protruding to the inner peripheral side from the compartment 10 (10A, 10B).
- the inner partition wall 30 (30A, 30B) is supported by the passenger compartment 10 via the support rod 51 of the above.
- a plurality of support rods 51 are radially provided between the passenger compartment 10 and the inner partition wall 30.
- a gap 38 may be provided between adjacent support rods 51 so that drains can pass therethrough.
- the inner partition wall 30 may be detachably supported to the passenger compartment 10.
- the passenger compartment 10 is divided into the upper half passenger compartment 10A and the lower half passenger compartment 10B in the horizontal division plane 11.
- the inner partition wall 30 is also divided into an upper half partition wall 30A and a lower half partition wall 30B in the horizontal division plane 31.
- FIGS. 2 and 4 in the upstream side support structure 40A, a semi-annular vehicle interior side support member 42A corresponding to the upper half vehicle compartment 10A is attached to the partition side end of the support rod 41 .
- a semi-annular partition wall side support member 45A corresponding to the upper half partition wall 30A is attached on the outer peripheral side of the upper half partition wall 30A.
- an upstream first key groove 44A is formed so as to straddle the cabin side support member 42A and the partition side support member 45A.
- the upstream first key 48A is fitted in the upstream first key groove 44A, and is fastened to the vehicle interior side supporting member 42A by a bolt 49A.
- the upper half partition wall 30A is supported by the upper half vehicle compartment 10A.
- part shown with a dashed-dotted line in FIG. 5 has shown the upstream support structure 40B of the lower half.
- a semi-annular vehicle interior side support member 52A corresponding to the upper half vehicle compartment 10A is attached to the partition side end of the support rod 51 .
- a semi-annular partition wall side support member 55A corresponding to the upper half partition wall 30A is attached on the outer peripheral side of the upper half partition wall 30A.
- the first key groove 54A is formed across the vehicle compartment side support member 52A and the partition side support member 55A, and the downstream side first key groove 54A.
- the downstream first key 58A is fitted to the Further, the upper half partition wall 30A is supported by the upper half vehicle chamber 10A by the downstream first key 58A being fastened to the vehicle interior support member 52A by the bolt 59A. On the upper half side, the load of the upper half partition wall 30A is also supported by the first keys 48A and 58A.
- the upstream side second key groove is straddled by the vehicle compartment side support member 42B and the partition side support member 45B. 44B is formed, and the upstream second key 48B is fitted in the upstream second key groove 44B. Further, the upper half second partition 48B is fastened to the vehicle interior support member 42B by the bolt 49B (see FIG. 5), whereby the lower half partition wall 30B is supported by the lower half vehicle compartment 10B. Furthermore, as shown in FIG. 3, in the lower half side downstream side support structure 50B as well as the upper half side described above, the second downstream side side is straddled by the vehicle compartment side support member 52B and the partition side support member 55B.
- the key groove 54B is formed, and the downstream second key 58B is fitted in the downstream second key groove 54B.
- the lower half partition wall 30B is supported by the lower half vehicle compartment 10B by the downstream second key 58B being fastened to the vehicle compartment side support member 52B by the bolt 59B.
- first keys 48A, 58A are removed from first key grooves 44A, 54A
- second keys 48B, 58B are second keys
- the upper half partition wall 30A and the lower half partition wall 30B can be easily removed from the upper half vehicle compartment 10A and the lower half vehicle compartment 10B, respectively.
- the first keys 48A and 58A and the second keys 48B and 58B are respectively inserted into the first key grooves 44A and 54A and the second key grooves 44B and 54B.
- the upper half partition 30A and the lower half partition 30B are respectively assembled into the upper half compartment 10A and the lower half compartment 10B. It can be easily attached to the Further, according to the axial flow exhaust turbine 1, the first key grooves 44A, 54A and the second key grooves 44B, 54B are fitted with the first keys 48A, 58A and the second keys 48B, 58B, respectively. It is possible to prevent circumferential movement of the half partition wall 30A and the lower half partition wall 30B.
- the upper half is formed using the first key groove 44A, 54A and the second key groove 44B, 54B and the first key 48A, 58A and the second key 48B, 58B. Since the partition wall 30A and the lower half partition wall 30B are configured to be supported by the upper half vehicle chamber 10A and the lower half vehicle chamber 10B, the casing can be more securely fixed to the inner partition wall, and stable operation of the turbine is possible for a long time become.
- the upper half side vehicle compartment side support member 42A is provided with a fitting groove 43A having a step in the turbine axial direction L, and the upper half side partition wall side
- the support member 45A may be provided with a protrusion 46A that fits into the fitting groove 43A, and the fitting groove 43A and the protrusion 46A may be fitted.
- the fitting groove 43A and the protrusion 46A are formed in, for example, a semi-annular shape.
- the fitting groove 53A and the protrusion 56A may be provided in the vehicle compartment side support member 42B and the partition wall side support member 45B.
- FIG. 8 is a cross-sectional view showing the entire configuration of an axial flow exhaust turbine according to a second embodiment
- FIG. 9 is a main part cross-sectional view showing the periphery of the inner partition wall of the axial flow exhaust turbine according to the present embodiment
- 10 is an enlarged view of a portion E showing the positioning structure of the upstream inner partition shown in FIG. 9, and
- FIG. 11 is a front view taken along the line FF shown in FIG.
- the casing 10 is divided into the upper half casing 10A and the lower half casing 10B in the horizontal division plane 11. Accordingly, in the case of the upper half car room, the reference numerals attached to the respective configurations, parts, etc. described below are attached with "A" after the numbers, and in the case of the lower half car rooms with "B" Classify. When this is not attached and only the numeral code is described, the upper half cabin will be described, and the lower half cabin will be considered the same.
- the inner partition 100 is divided into two segments (the upstream inner partition 110 and the downstream inner partition 120) in a plane orthogonal to the axial direction, which is different from the first embodiment. . That is, the inner partition wall 100 is formed of an upstream inner partition wall 110 provided on the inlet side of the exhaust chamber 8 and a downstream inner partition wall 120 provided on the immediate downstream side thereof. What is damaged mainly by the attack of the steam drain discharged from the steam passage 6 is the upstream inner partition 110 around the partition-side support member 142 mainly at the inlet of the exhaust chamber 8. On the other hand, the downstream side of the bulkhead side support member 142 is hardly damaged.
- the inlet of the exhaust chamber 8 is made of a food-resistant material that resists erosion and the like, and is configured to be detachable. That is, the inner partition wall 100 at the inlet portion of the exhaust chamber 8 is divided into two at a plane orthogonal to the axial direction, and the upstream inner partition wall 110 provided on the inlet side of the exhaust chamber 8 and the downstream portion provided immediately downstream thereof It is formed by the side inner partition wall 120. Both the upstream inner partition wall 110 and the downstream inner partition wall 120 are detachable.
- the upstream inner partition wall 110 damaged by the drain attack is made of a corrosion resistant material.
- the downstream side inner partition wall 120 on the downstream side uses a general iron material because damage is minor.
- the reason why the inner partition wall 100 is divided into the upstream inner partition wall 110 and the downstream inner partition wall 120 so as to be removable is to facilitate replacement of the upstream inner partition wall 110. What is replaced for maintenance is the upstream inner partition 110, and the downstream inner partition 120 can be used as it is without replacement.
- downstream inner partition 120 disposed downstream of the upstream inner partition 110 is annularly disposed around the turbine shaft L.
- a reinforcing plate 121 is annularly disposed in the circumferential direction, and the rigidity of the downstream inner partition 120 is enhanced.
- the inner casing 101 forming a part of the vehicle compartment is attached to the inner wall of the vehicle compartment 10A via the support rod 102 in the same manner as the structure described in the first embodiment. It is fixed by welding etc.
- the inner casing 101 is disposed radially inward of the second casing 22 (vehicle compartment 10A), and is disposed so as to form a part of the exhaust chamber 8 around the turbine axis L.
- An annular gap surrounded by the second casing 22 and the inner casing 101 is surrounded by the second casing 22 arranged on the upstream side and the inner partition wall 100, and is in communication with the drain passage 34 formed in an annular shape.
- the annular gap forms a part of the drain passage, and serves as a passage for discharging the drain collected in the steam passage 6 to the downstream side of the exhaust chamber 8.
- the upstream inner partition wall 110 is supported by the vehicle compartment 10A via an upstream support structure 140 (first support structure) fixed inside the compartment 10A.
- the upstream support structure 140 includes a support rod 141 and a partition-side support member 142 disposed inside the support rod 141 and disposed annularly around the turbine shaft L.
- the upstream inner partition wall 110 is an annular member having an L-shaped cross section when viewed in the circumferential direction, and is divided into two in the circumferential direction by at least the horizontal split surface 31.
- the upstream inner partition wall 110 is in contact with the radially inner inner circumferential surface and the downstream side surface of the partition side support member 142, and is fixed to the partition side support member 142 from the downstream side in the turbine axis L direction.
- the upstream inner partition wall 110 is L-shaped in cross section, and has a bowl shape radially outward from the guide portion 111 and the guide portion 111 facing the exhaust chamber 8 side.
- the protruding support portion 112 is a member integrally formed.
- the guide portion 111 is in contact with the inner peripheral surface of the partition side support member 142 at the outer peripheral surface in the radial direction.
- the support portion 112 is a member which is disposed on the downstream side of the guide portion 111 and which is formed in an annular shape in the axial direction and which is provided radially outward from the guide portion 111.
- the upstream inner partition 110 is screwed with a bolt 143 to the partition side support member 142 from the downstream side in the turbine axial direction and fixed. Therefore, a bolt hole through which the bolt 143 can be inserted is opened in the support portion 112 of the upstream inner partition wall 110, and a female screw hole is formed in the downstream side surface in contact with the support portion 112 of the partition support member 142. (Not shown).
- the upstream inner partition 110 be attached with the required roundness maintained and the clearance between the upstream inner partition 110 and the moving blade 12 being constant. Therefore, among the bolts for fixing the upstream inner partition wall 110, the inner partition positioning with a positioning function in place of the bolts at a plurality of locations (at least two of one divided piece of the upstream inner partition wall).
- a member 150 fixes the upstream inner partition 110.
- the inner partition wall positioning member 150 will be described.
- the inner partition positioning member 150 positions the upstream inner partition 110 in the circumferential direction with respect to the partition side support member 142 to maintain the roundness of the upstream inner partition 110, and the rotor blade 12 and the upstream inner partition It is a structural member for adjusting the clearance between the inner circumferential surface of 110.
- the inner partition positioning member 150 (a bush 151 described later) is provided on the support portion 112 of the upstream inner partition 110.
- a plurality of through holes 113 through which can be inserted are bored in the axial direction.
- a plurality of tip end holes 142a to which the inner partition positioning member 150 (the tip 152b of the eccentric pin described later) can be fitted It is perforated.
- the upstream inner partition 110 inserts the inner partition positioning member 150 into the through hole 113 of the support portion 112 and the tip end hole 142 a of the partition support member 142, thereby providing the partition support member 142 from the downstream side in the axial direction It is fixed.
- the inner partition wall positioning member 150 is composed of a bush 151 and an eccentric pin 152, as shown in FIGS.
- the bush 151 is a cylindrical member and has a pin hole 151a in which the eccentric pin 152 is inserted.
- the eccentric pin 152 is a cylindrical member, and includes a large diameter main body portion 153 and a tip portion 154 whose diameter is smaller than that of the main body portion 153.
- the head of the eccentric pin 152 is provided with a grip 155 for making the eccentric pin 152 rotatable.
- the pin hole 151a formed in the bush 151 has an inner diameter that allows only the main body portion of the eccentric pin 152 to be inserted, and the tip end portion 154 of the eccentric pin 151 is formed on the downstream side surface of the partition side support member 142 It is inserted into the tip end hole 142a.
- the eccentric pin 152 is formed such that the center P1 of the tip end portion 154 and the center P2 of the main body portion 153 are offset by the length X in the radial direction of the eccentric pin 152, and the main body portion 153 and the tip end portion 154 are integrated to form one An eccentric pin 152 is formed.
- the center of the grip portion 155 of the eccentric pin 152 preferably coincides with the center P2 of the main body portion 153.
- the center P2 of the pin hole 151a formed inside the bush 151 and the center P3 of the bush 151 are formed eccentrically by the length Y in the radial direction of the bush 151.
- At least two adjustment holes 151 b are provided on the outer surface of the bush 151 viewed from the downstream side in the turbine axial direction so that the bush can be rotated around the through hole.
- the center P2 of the pin hole 151a opened in the bush 151 is eccentric from the center P3 of the bush 151 by the length Y, and the center P2 of the main body portion 153 of the eccentric pin 151 and the center P1 of the tip portion 154 have a length X Only eccentric. Further, since the main body portion 153 of the eccentric pin 152 is fitted in the pin hole 151a of the bush 151, the center P2 of the main body portion 153 of the eccentric pin 152 coincides with the center of the pin hole 151a of the bush 151.
- the combination of the members having the two eccentric structures enables accurate positioning of the upstream inner partition 110 with respect to the partition side support member 142.
- the center P3 of the bush 151 and the center P1 of the tip portion 154 of the eccentric pin 152 are eccentric by the length (X + Y).
- the deviation (X + Y) be zero and that the centers P1 and P3 coincide with each other.
- the bush 151 has a structure that can rotate with respect to the support portion 112 with the through hole 113 as a sliding surface.
- the center P2 of the main body portion 153 of the eccentric pin 152 draws an arc-shaped locus C1 of a radius Y (two-dot chain circle in FIG. 11) centering on the center P3 of the bush 151 Moving.
- the center of the tip 154 of the eccentric pin 152 P1 moves by drawing an arc-like locus C2 (dotted circle in FIG. 11) having a radius X around the center P2 of the main body portion 153.
- the tip of the eccentric pin 152 travels within a circle of radius (X + Y) with the center P3 of the bush 151 as the center.
- the distance between the center of the through hole 113 of the support portion 112 of the upstream inner partition 110 (the center P3 of the bush 151) and the center of the tip end hole 142a of the partition support member 142 (the center P1 of the tip 154) is within the range of the length (X + Y), alignment is possible such that the deviation between the two (the deviation of the centers P1 and P3) becomes zero by the combination of the two members having an eccentric structure.
- the eccentric lengths X and Y of the bush 151 and the eccentric pin 152 may be selected in consideration of manufacturing errors of the partition side support member 142 and the upstream inner partition 110.
- the bush 151 and the eccentric pin 152 are individually operated, and the position where the center P1 of the tip portion 154 and the center P3 of the bush 151 coincide with each other becomes the accurate position of the upstream inner partition 110.
- the upstream inner partition 110 is moved downstream in the turbine axial direction using other bolts 143.
- the partition wall side support member 142 By attaching the partition wall side support member 142 from the side, the adjustment of the clearance between the upstream inner partition wall 110 and the moving blade 12 is completed.
- the upstream inner partition 110 is fixed to the partition support member 142 from the downstream side in the axial direction of the turbine by the support member such as the bolt 143 and the inner partition positioning member 150, these support members There is no need to set up on the exhaust chamber side. For this reason, there is no possibility that the flow of the steam flow flowing in the exhaust chamber may be disturbed by the support member, and the turbine efficiency is not reduced.
- the downstream inner partition wall 120 has a structure divided into two in the circumferential direction by the horizontal dividing surface 31 as described above.
- FIG. 13 is an enlarged view of a portion H shown in FIG. 12 and shows a support structure between the downstream inner partition wall 120 and the passenger compartment 10.
- the downstream inner partition wall 120 includes a base plate 161 projecting radially outward on the outer wall thereof, and is fixed to the passenger compartment 10 via the downstream support structure 160.
- the base plate 161 is fixed on the radially outer side of the downstream inner partition 120 so as to be parallel to the horizontal division surface 31 at the same position as both ends in the circumferential direction of the upstream inner partition 110 divided into two. ing.
- the base plate 161 is formed with a bolt hole 162a through which a bolt 162 for fixing the downstream inner partition 120 to the vehicle compartment 10 can pass.
- the downstream side support structure 160 is attached in the vicinity of the horizontal division surface 31 of the passenger compartment 10 and in the vicinity of the inside in the radial direction of the second casing 22 of the upper and lower half passenger compartments 10A and 10B.
- the downstream side supporting structure 160 is provided between a casing fixing plate 163 fixed to the second casing 22, a bolt 162 for fastening the base plate 161 to the casing fixing plate 163, the base plate 161 and the casing fixing plate 163.
- the casing fixing plate 163 is a plate-like member fixed to the inner wall of the second casing 22 and erected toward the center of the turbine axis in a direction parallel to the horizontal division surface 31 from the inner wall.
- the casing fixing plate 163 is provided with a bolt hole 162a having an internal thread in which the bolt 162 can be screwed.
- the adjusting plate 164 is inserted between the casing fixing plate 163 and the base plate 161, and the inner peripheral surface of the upstream inner partition 110, the inner peripheral surface of the downstream inner partition 120, and the inner peripheral surface of the inner casing 101 are substantially
- the radial position of the downstream inner partition 120 can be adjusted so as to be flush and form a smooth surface.
- the inner partition wall When the inner partition wall is assembled to the vehicle compartment, the upper half vehicle compartment 10A and the lower half vehicle compartment 10B are divided and opened, and the respective vehicle compartments are assembled.
- the inner partition positioning member 150 the exact position of the upstream inner partition 110 with respect to the partition support member 142 is determined, and the upstream inner partition 110 is fixed to the partition support member 142 by the eccentric pin 152.
- the upstream inner partition 110 is tightened with a bolt 143 toward the upstream from the downstream side in the axial direction to the partition side support member 142 and attached.
- the downstream inner partition 120 is attached to the passenger compartment via the downstream support structure 160.
- the downstream inner partition wall 120 inserts the bolt 162 into the bolt hole 162a formed in the casing fixing plate 163 and the base plate 161, and screws the bolt 162 into the female screw hole provided in the casing fixing plate 163 for fixation.
- an adjustment plate 164 of an appropriate thickness is inserted between the casing fixing plate 163 and the base plate 161, and the inner circumferential surface on the exhaust chamber side of the upstream inner partition 110 and the downstream inner partition 120 It is preferable to adjust so as to be flush with each other.
- the upper and lower half vehicle compartments 10A and 10B are integrated, and the flanges 10A1 and 10B1 are fastened with the flange fastening bolts to complete the assembly of the passenger compartment 10.
- the disassembly of the cabin may be performed in the reverse order of the assembly.
- the upstream inner partition wall 110 When replacing the inner partition wall 100, the upstream inner partition wall 110 can be easily removed from the axial direction by removing the downstream inner partition wall 120 on the downstream side. In the case of the first embodiment, it is necessary to remove the entire inner partition at one time, but in the case of the present embodiment, the replacement operation is easy because it can be removed individually. In addition, since only the upstream inner partition wall 110 needs to be replaced in maintenance, the present embodiment is more advantageous in cost than the first embodiment.
- the inner partition walls 30, 100 are supported via the upstream side support structures 40A, 40B, 140 and the downstream side support structures 50A, 50B, 160, but the support structure is three in the turbine axial direction L
- the number of installation and the installation position of the support structure are not limited to the above configuration.
- FIG. 14 is a perspective view showing the annular member 70. As shown in FIG. The components other than the annular member 70 will be described using the same reference numerals as the reference numerals described above.
- the annular member 70 is composed of an upper half-side semi-annular member 70A and a lower half-side semi-annular member 70B, and both members 70A and 70B are attached to the compartment 10 side and project radially outward from the compartment 10 Will be installed.
- the annular member 70 is provided with a plurality of openings 72 communicating in the turbine axial direction L in the circumferential direction. Since the inner partition walls 30, 100 are supported over the entire circumferential direction with respect to the vehicle compartment 10 through the annular member 70, more stable fixing of the inner partition walls 30, 100 to the vehicle compartment 10 is possible Become.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Turbines (AREA)
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Abstract
Description
このような軸流排気タービンでは、復水器が軸方向に排気室と並んで配置されるため、蒸気通路からどのようにしてドレンを排出するのかが問題になる。
また、車室と内側隔壁との間に形成される空間をドレン流路として用いるようにしているので、蒸気通路から回収されたドレンを円滑に排出可能である。さらに特許文献2のようにドレンを導く配管を車室外部に設ける必要がないためタービンの省スペース化が図れ、レイアウトの自由度も向上させることができる。
このように、車室から内周側に張り出す複数の支持部を介して内側隔壁を車室に支持することで、内側隔壁を車室に安定して支持可能である。
これにより、蒸気通路から回収されたドレンをドレン流路に導く通路を新たに設ける必要がなくなり、装置構成の簡素化が図れる。
上記軸流排気タービンによれば、内側隔壁は環状部材を介して車室に対して周方向全周に亘って支持されているので、内側隔壁の車室へのより安定した固定が可能となる。また、環状部材にはドレンが通過可能な開口が設けられているので、上記通路から回収されたドレンを円滑にドレン流路に導くことができる。
上記軸流排気タービンでは、車室側の部材及び内側隔壁側の部材の一方に設けられた嵌合溝と、他方に設けられた突出部とが嵌合するようになっている。このとき、嵌合溝は、タービン軸方向に段差を有しているので、嵌合溝と突出部とを嵌合させることによって、内側隔壁の車室に対する相対的なタービン軸方向における移動を阻止することができる。
上記軸流排気タービンによれば、上半車室側の部材と上半隔壁とにまたがって形成される第1キー溝と、下半車室側の部材と下半隔壁とにまたがって形成される第2キー溝とを設け、これら第1キー溝及び第2キー溝にそれぞれ第1キー、第2キーを嵌合させることによって、上半隔壁及び下半隔壁の周方向の移動を阻止することを可能としている。
これにより、第1キーを介して上半隔壁を上半車室側の部材で支えて、上半隔壁の落下を防止できる。
前記第2キー溝は、上流側の前記下半隔壁と前記下半車室側部材とにまたがって配置される上流側第2キー溝と、下流側の前記下半隔壁と前記下半車室側部材とにまたがって配置される下流側第2キー溝より形成され、前記上流側第2キー溝に上流側第2キーが嵌合し、前記下流側第2キー溝に下流側第2キーが嵌合していてもよい。
これにより、内側隔壁が車室に対して、より確実に固定され、長期にわたりタービンの安定した運転が可能になる。
これにより、損傷を受け易い方のセグメント(上流側内側隔壁)の交換が容易になる。
これにより、車室側に上流側内側隔壁を取付ける場合に要する支持部材を、排気室内に設ける必要がなく、排気室内の蒸気流を乱すおそれがない。
これにより、上流側内側隔壁とは切り離して、下流側内側隔壁を単独で車室に取り付けたり取り外したりすることができるので、メンテナンスが容易になる。
これにより、上流側内側隔壁の車室に対する位置決めが容易になり、上流側内側隔壁の正確な真円度が得られ、内側隔壁と動翼との間のクリアランス調整が容易になる。
これにより、下流側内側隔壁の車室に対する径方向の位置調整が可能となり、排気室内を流れる蒸気流の乱れを低減できる。
また、車室と内側隔壁との間に形成される空間をドレン流路として用いるようにしているので、蒸気通路から回収されたドレンを円滑に排出可能で、さらにタービンの省スペース化が図れ、レイアウトの自由度も向上させることができる。
なお、以下の説明において、上流側とは、動翼12側から排気室8側に向かって蒸気Sが流れる場合の動翼側(図1の紙面上で左側)を言い、下流側とは、排気室側(図1の紙面上で右側)を言う。また、タービン軸方向とは、図1に示すタービン軸Lが配置された方向(排気室上流側から下流側に蒸気Sが流れる方向)を示し、径方向とはタービン軸方向に対して垂直な方向をいい、周方向とはタービン軸L廻りに回転する方向を言う。
図1は第一実施形態に係る軸流排気タービンの全体構成を示す断面図で、図2は図1に示す軸流排気タービンのA-A線断面図で、図3は図1に示す軸流排気タービンのB-B線断面図で、図4は軸流排気タービンの内側隔壁周辺を示す要部断面図である。なお、図4は、図1と同一の断面(鉛直方向断面)の図を示している。
図1に示すように、軸流排気タービン1は、ロータ2と、ロータ2の周囲に配置される翼列4と、翼列4を通る蒸気通路6と、蒸気通路6の下流側に設けられる排気室8と、蒸気通路6及び排気室8を内部に有する車室10とを有する。
一実施形態では、内側隔壁30は、翼列4の出口側、すなわち最終段動翼12aの近傍から排気室8にかけて設けられている。このとき、内側隔壁30は、排気室8の全体に亘って設けられてもよいし、排気室8に対して部分的に設けられてもよい。但し、内側隔壁30が排気室8に対して部分的に設けられる場合には、該隔壁30がドレン流路34としても機能するように、少なくとも排気室8の入口側に設けられることが好ましい。また、内側隔壁30は、タービン軸方向Lの下流側に向かって拡径した形状を有していてもよい。なお、内側隔壁30の補強を目的として、内側隔壁30の外周面に、タービン軸方向Lに沿って形成されるリブ32を周方向に複数設けてもよい。
また、車室10と内側隔壁30との間に形成される空間をドレン流路34として用いるようにしているので、蒸気通路6から回収されたドレンを円滑に排出可能で、さらにタービンの省スペース化が図れ、レイアウトの自由度も向上させることができる。
本実施形態に係る軸流排気タービン1は、内側隔壁30を車室10側に支持させる上流側支持構造40(40A,40B),下流側支持構造50(50A,50B)をさらに備えていてもよい。上流側支持構造40はタービン軸方向Lの上流側に配置され、下流側支持構造50は上流側支持構造40より下流側に配置される。
図3に示す本実施形態では、下流側支持構造50(50A,50B)は、車室10(10A,10B)から内周側に張り出す複数の支持棒51を有しており、これらの複数の支持棒51を介して内側隔壁30(30A,30B)が車室10に支持されるようになっている。支持棒51は、車室10と内側隔壁30との間に、放射状に複数設けられている。隣接する支持棒51の間にはドレンが通過可能なように間隙38が設けられていてもよい。
上記構成により、蒸気通路6から回収されたドレンをドレン流路34に導く通路を新たに設ける必要がなくなり、装置構成の簡素化が図れる。
車室10は、上述したように、水平分割面11において上半車室10Aと下半車室10Bとに分割されている。同様に内側隔壁30も、水平分割面31において上半隔壁30Aと下半隔壁30Bとに分割されている。
図2及び図4に示すように、上流側支持構造40Aにおいて、支持棒41の隔壁側端部には、上半車室10Aに対応した半環状の車室側支持部材42Aが取り付けられている。一方、上半隔壁30Aの外周側には、上半隔壁30Aに対応した半環状の隔壁側支持部材45Aが取り付けられている。そして、図5及び図6に示すように、車室側支持部材42A及び隔壁側支持部材45Aとにまたがって上流側第1キー溝44Aが形成されている。上流側第1キー溝44Aには上流側第1キー48Aが嵌合し、ボルト49Aによって車室側支持部材42Aに締結されている。これにより、上半隔壁30Aは上半車室10Aに支持される。なお、図5において一点鎖線で示す部位は下半の上流側支持構造40Bを示している。
さらに、図3に示すように、下半側の下流側支持構造50Bにおいても、上記した上半側と同様に、車室側支持部材52B及び隔壁側支持部材55Bとにまたがって下流側第2キー溝54Bが形成され、下流側第2キー溝54Bに下流側第2キー58Bが嵌合している。また、ボルト59Bによって下流側第2キー58Bが車室側支持部材52Bに締結されることによって、下半隔壁30Bが下半車室10Bに支持される。
また、上記軸流排気タービン1によれば、第1キー溝44A,54A及び第2キー溝44B,54Bに第1キー48A,58A及び第2キー48B,58Bをそれぞれ嵌合させることによって、上半隔壁30A及び下半隔壁30Bの周方向の移動を阻止することを可能としている。
さらに、タービン軸方向Lの上流側及び下流側において、第1キー溝44A,54A及び第2キー溝44B,54Bと第1キー48A,58A及び第2キー48B,58Bとを用いて、上半隔壁30A及び下半隔壁30Bを上半車室10A及び下半車室10Bに支持させる構成としたので、内側隔壁に対して車室がより確実に固定され、長期にわたりタービンの安定した運転が可能になる。
同様に、下半側の上流側支持構造40Bにおいても、車室側支持部材42B及び隔壁側支持部材45Bに嵌合溝53A及び突出部56Aを設けてもよい。また、タービン軸方向Lの下流側の下流側支持構造50A,50Bにも同様の構成を採用してもよい。
このように、嵌合溝43A,53Aと突出部46A,56Aとを嵌合させることによって、内側隔壁30の車室10に対する相対的なタービン軸方向Lにおける移動を阻止することができる。
次に、第一実施形態とは異なる内側隔壁を備えた軸流排気タービンについて、以下に第二実施形態として説明する。本実施形態は、内側隔壁の構造が異なることを除き、他の構造は第一実施形態と同一である。
図8は第二実施形態に係る軸流排気タービンの全体構成を示す断面図で、図9は本実施形態に係る軸流排気タービンの内側隔壁周辺を示す要部断面図である。図10は、図9に示す上流側内側隔壁の位置決め構造を示すE部拡大図で、図11は図10に示すF-F線正面図である。
なお、第一実施形態と同一の構造、部品等は、同一の名称、符号を用い、詳細な説明は省略する。なお、第一実施形態と同様に、本実施形態においても、車室10 は、上述したように、水平分割面11 において上半車室10Aと下半車室1 0Bとに分割されている。従って、以下に説明する各構成、部品等に付す符号は、上半車室の場合は、数字の後に「A」を付し、下半車室の場合は数字の後に「B」を付して区分する。これを付さず数字の符号のみで説明する場合は、上半車室についての説明とし、下半車室も同様と考える。
つまり、上流側内側隔壁110のサポート部112の貫通穴113の中心(ブッシュ151の中心P3)と隔壁側支持部材142の先端部穴142aの中心(先端部154の中心P1)の間の距離が、長さ(X+Y)の範囲内であれば、偏心構造を備えた2つの部材の組合せにより、両者の間の偏差(中心P1とP3のずれ)が零となるように位置合わせが可能である。なお、隔壁側支持部材142と上流側内側隔壁110の製作誤差を考慮して、ブッシュ151と偏心ピン152の偏心長さX、Yを選定すればよい。
例えば、図14に示すような環状部材70によって、内側隔壁30,100が車室10に支持されるようにしてもよい。ここで、図14は環状部材70を示す斜視図である。なお、環状部材70以外の構成については、上述した符号と同一の符号を用いて説明する。環状部材70は、上半側半環状部材70Aと下半側半環状部材70Bとから構成され、いずれの部材70A,70Bも車室10側に取り付けられ、車室10から内周側に張り出して設置される。環状部材70にはタービン軸方向Lに連通する開口72が周方向に複数設けられている。内側隔壁30,100は、この環状部材70を介して車室10に対して周方向全周に亘って支持されるので、内側隔壁30,100の車室10へのより安定した固定が可能となる。
2 ロータ
3 ディスク
4 翼列
6 蒸気通路
8 排気室
10 車室
10A 上半車室
10B 下半車室
12 動翼
12a 最終段動翼
14 静翼
14a 最終段静翼
30 内側隔壁
30A 上半隔壁
30B 下半隔壁
31 水平分割面
32 リブ
34 ドレン流路
36,38 間隙
40A,40B,140 上流側支持構造(第1支持構造)
50A,50B,160 下流側支持構造(第2支持構造)
41,51 支持棒
42A,42B,52A,52B 車室側支持部材
43A 嵌合溝
44A,54A 第1キー溝(上流側第1キー溝、下流側第1キー溝)
44B,54B 第2キー溝(上流側第2キー溝、下流側第2キー溝)
45A,45B,55A,55B,142 隔壁側支持部材
46A,56A 突出部
48A,58A 第1キー(上流側第1キー、下流側第1キー)
48B,58B 第2キー(上流側第2キー、下流側第2キー)
49A,59A,49B、59B,143,162 ボルト
70 環状部材
70A、70B 半環状部材(上半側半環状部材、下半側半環状部材)
72 開口
100 内側隔壁
101 内側ケーシング
102 支持棒
110 上流側内側隔壁
111 ガイド部
112 サポート部
113 貫通穴
120 下流側内側隔壁
121 補強板
141 支持棒
142a 先端部穴
150 内側隔壁位置決め部材
151 ブッシュ
151a ピン穴
151b 調整穴
152 偏心ピン
153 本体部
154 先端部
155 把持部
161 ベース板
162a ボルト穴
163 車室固定板
164 調整板
165 補強リブ
P1 先端部中心
P2 本体部中心
P3 ブッシュ中心
Claims (13)
- 動翼及び静翼が配列される蒸気通路と、
前記蒸気通路の下流側に設けられ、前記蒸気通路からの蒸気をタービン軸方向に沿って排出する排気室と、
前記蒸気通路及び前記排気室を内部に有する車室と、
前記車室の内周側に設けられ、前記排気室に面する内側隔壁とを備え、
前記車室と前記内側隔壁との間に、前記蒸気通路から回収されたドレンが通過可能なドレン流路が形成されていることを特徴とする軸流排気タービン。 - 前記車室から内周側に張り出す複数の支持部をさらに備え、
前記内側隔壁は、前記複数の支持部を介して前記車室に支持されていることを特徴とする請求項1に記載の軸流排気タービン。 - 前記ドレンは、隣接する前記支持部を構成する支持棒の間を通過して前記ドレン流路に導かれることを特徴とする請求項2に記載の軸流排気タービン。
- 前記車室から内周側に張り出すとともに、前記ドレンが通過可能な開口が設けられた環状部材をさらに備え、
前記内側隔壁は、前記環状部材を介して前記車室に支持されていることを特徴とする請求項1に記載の軸流排気タービン。 - 前記車室側の部材及び前記内側隔壁側の部材の一方に、前記タービン軸方向に段差を有する嵌合溝が設けられ、前記車室側の部材及び前記内側隔壁側の部材の他方に、前記嵌合溝に嵌合する突出部が設けられ、前記嵌合溝及び前記突出部が嵌合していることを特徴とする請求項1に記載の軸流排気タービン。
- 前記車室は、水平分割面において分割可能な上半車室と下半車室とを含み、
前記内側隔壁は、水平分割面において分割可能な上半隔壁と下半隔壁とを含み、
前記水平分割面において、前記上半車室側の部材と前記上半隔壁とにまたがって形成された第1キー溝と、前記下半車室側の部材と前記下半隔壁とにまたがって形成された第2キー溝とに、それぞれ、第1キー及び第2キーが嵌合していることを特徴とする請求項1に記載の軸流排気タービン。 - 前記第1キーは前記上半車室側の部材に締結され、前記第1キーによって前記上半隔壁の荷重を支持するようにしたことを特徴とする請求項6に記載の軸流排気タービン。
- 前記第1キー溝は、上流側の前記上半隔壁と前記上半車室側部材とにまたがって配置される上流側第1キー溝と、下流側の前記上半隔壁と前記上半車室側部材とにまたがって配置される下流側第1キー溝より形成され、前記上流側第1キー溝に上流側第1キーが嵌合し、前記下流側第1キー溝に下流側第1キーが嵌合し、
前記第2キー溝は、上流側の前記下半隔壁と前記下半車室側部材とにまたがって配置される上流側第2キー溝と、下流側の前記下半隔壁と前記下半車室側部材とにまたがって配置される下流側第2キー溝より形成され、前記上流側第2キー溝に上流側第2キーが嵌合し、前記下流側第2キー溝に下流側第2キーが嵌合していることを特徴とする請求項6または7のいずれか一項に記載の軸流排気タービン。 - 前記内側隔壁は、少なくとも前記タービン軸方向に垂直な面に沿って2つ以上のセグメントに分割されている請求項1乃至4の何れか一項に記載の軸流排気タービン。
- 前記内側隔壁の前記セグメントのうち、前記蒸気通路の上流側に配置された上流側内側隔壁は、前記タービン軸方向の下流側から第1支持構造に着脱自在に取り付けられている請求項9に記載の軸流排気タービン。
- 前記内側隔壁の前記セグメントのうち、前記上流側内側隔壁に対して前記蒸気通路の下流側に配置された下流側内側隔壁は、前記車室から内周側に張り出す第2支持構造を介して前記車室に支持されている請求項10に記載の軸流排気タービン。
- 前記上流側内側隔壁は、偏心構造を備えた2つの部材を含む位置決め部材を備える請求項10に記載の軸流排気タービン。
- 前記第2支持構造は、前記下流側内側隔壁を径方向に関して位置決め可能な調整板を備えている請求項11に記載の軸流排気タービン。
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US10072528B2 (en) | 2018-09-11 |
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EP2889456A4 (en) | 2016-08-03 |
CN104471198A (zh) | 2015-03-25 |
JP6000354B2 (ja) | 2016-09-28 |
CN104471198B (zh) | 2016-04-27 |
KR101671650B1 (ko) | 2016-11-01 |
US20150176435A1 (en) | 2015-06-25 |
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