WO2016068159A1 - クリアランス制御型シール構造 - Google Patents
クリアランス制御型シール構造 Download PDFInfo
- Publication number
- WO2016068159A1 WO2016068159A1 PCT/JP2015/080314 JP2015080314W WO2016068159A1 WO 2016068159 A1 WO2016068159 A1 WO 2016068159A1 JP 2015080314 W JP2015080314 W JP 2015080314W WO 2016068159 A1 WO2016068159 A1 WO 2016068159A1
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- WIPO (PCT)
- Prior art keywords
- seal ring
- control type
- clearance control
- structure according
- seal structure
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/14—Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing
- F01D11/20—Actively adjusting tip-clearance
- F01D11/24—Actively adjusting tip-clearance by selectively cooling-heating stator or rotor components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/001—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between stator blade and rotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/003—Preventing or minimising internal leakage of working-fluid, e.g. between stages by packing rings; Mechanical seals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/025—Seal clearance control; Floating assembly; Adaptation means to differential thermal dilatations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
- F01D11/06—Control thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/10—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using sealing fluid, e.g. steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/14—Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing
- F01D11/20—Actively adjusting tip-clearance
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/28—Arrangement of seals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/002—Sealings comprising at least two sealings in succession
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/24—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings with radially or tangentially compressed packing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/445—Free-space packings with means for adjusting the clearance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/55—Seals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/441—Free-space packings with floating ring
- F16J15/442—Free-space packings with floating ring segmented
Definitions
- the present invention relates to a clearance control type seal structure.
- ACC seal structure is a structure that automatically adjusts the distance between the abradable seal ring and the rotor or fins disposed on the rotor.
- a structure in which about four abradable seal rings are connected is used to optimize the ACC seal structure operation design, and the pressure to be operated by each abradable seal ring is designed.
- the operating pressures are different.
- the abradable seal ring designed to lower the operating pressure is activated first as the back pressure (steam pressure) increases.
- an object of the present invention is to provide a clearance control type seal structure that can reliably operate each abradable seal ring at a desired timing, and a turbine having this clearance control type seal structure.
- a clearance control type seal structure for solving the above-mentioned problems is as follows.
- a plurality of arc-shaped grooves formed side by side in the axial direction with respect to the inner peripheral surface of the housing in the turbine, A fitting portion fitted in the groove with a predetermined gap, and an expansion portion exposed radially inward from the housing and expanded in the axial direction, and during operation, due to a back pressure inside the groove
- With a plurality of seal rings that receive the force to move radially inward With a plurality of seal rings that receive the force to move radially inward, Among the plurality of seal rings, at least in the first seal ring and the second seal ring adjacent in the axial direction, The first seal ring operates at a higher load than the second seal ring, A part of each other has a diameter so that the second extension part, which is the extension part of the second seal ring, can press the first extension part, which is the extension part of the first seal ring, radially inward. It is characterized by overlapping in the
- a clearance control type seal structure according to a second invention for solving the above-mentioned problems is as follows.
- the clearance control type seal structure according to the first invention In the clearance control type seal structure according to the first invention, In the second extension part, On the outer peripheral surface of the end portion on the first seal ring side, a convex portion that is further expanded toward the first seal ring side is formed, In the first extension part, On the outer peripheral surface of the second seal ring side end, a concave portion corresponding to the convex portion is formed, The convex portion is inserted into the concave portion.
- a clearance control type seal structure according to a third invention for solving the above-mentioned problems is as follows.
- the clearance control type seal structure according to the first invention In the second extension part, On the inner side in the predetermined long diameter direction from the outer peripheral surface of the end portion on the first seal ring side, a convex portion that is further expanded toward the first seal ring side is formed, In the first extension part, A concave portion corresponding to the convex portion is formed on the inner side in the predetermined major axis direction from the outer peripheral surface of the second seal ring side end portion, The convex portion is inserted into the concave portion.
- a clearance control type seal structure according to a fourth invention for solving the above-mentioned problems is as follows.
- the clearance control type seal structure according to the first invention In the first extension part, On the inner side in the predetermined long diameter direction from the outer peripheral surface of the end portion on the second seal ring side, a convex portion that is further expanded toward the second seal ring side is formed, In the second extension part, A concave portion corresponding to the convex portion is formed on the inner side in a predetermined major axis direction from the outer peripheral surface of the first seal ring side end portion, The convex portion is inserted into the concave portion.
- a clearance control type seal structure for solving the above-mentioned problems is as follows.
- a second recess is formed on the inner side in the predetermined major axis direction from the outer peripheral surface of the first seal ring side end, A part of the arc-shaped flat plate portion having a shape corresponding to the second recess is inserted into the second recess,
- a first recess corresponding to the arc-shaped flat plate portion is formed; The arcuate flat plate portion is partially inserted into the first recess.
- a turbine according to a sixth invention for solving the above-described problem is as follows.
- the clearance control type seal structure according to the first invention is provided.
- a turbine according to a seventh invention for solving the above-described problem is as follows.
- the clearance control type seal structure according to the second invention is provided.
- a turbine according to an eighth invention for solving the above-described problem is The clearance control type seal structure according to the third invention is provided.
- a turbine according to a ninth invention for solving the above-described problem is The clearance control type seal structure according to the fourth invention is provided.
- a turbine according to a tenth invention for solving the above-described problem is The clearance control type seal structure according to the fifth invention.
- each abradable seal ring can be reliably operated at a desired timing.
- FIG. 1 is a cross-sectional view illustrating a clearance control type seal structure according to Embodiment 1 of the present invention.
- the clearance control type seal structure according to the first embodiment of the present invention is used for a turbine, and first includes abradable seal rings 11 and 12 and a plurality of grooves 23 as shown in FIG. .
- the number of abradable seal rings is not limited to two, but any number of abradable seal rings may be provided as long as there are two or more.
- the first abradable seal ring 11 in the front stage and the second abradable seal ring 12 in the rear stage that are adjacent in the axial direction will be described below. It is assumed that the first abradable seal ring 11 at the front stage is operated at a higher load than the second abradable seal ring 12 at the rear stage.
- the first abradable seal ring 11 includes a first fitting portion 11a and a first extension portion 11b. Moreover, the 2nd abradable seal ring 12 is provided with the 2nd fitting part 12a and the 2nd expansion part 12b.
- a plurality of arc-shaped grooves 23 are formed in the axial direction on the inner peripheral surface of the housing 22 surrounding the rotor 21.
- Each groove 23 has an enlarged portion 23a that is expanded in the axial direction.
- the abradable seal rings 11 and 12 are arc-shaped seal rings corresponding to the grooves 23, respectively. Then, the fitting portions 11 a and 12 a of the abradable seal rings 11 and 12 are fitted to the enlarged portion 23 a of the groove 23 with a predetermined gap, respectively. Further, the expanded portions 11b and 12b of the abradable seal rings 11 and 12 are exposed radially inward from the housing 22 and are expanded in the axial direction.
- Abradable portions 11b-1 and 12b-1 made of a free-cutting member are disposed on the inner peripheral surfaces of the expanded portions 11b and 12b of the abradable seal rings 11 and 12, respectively.
- the abradable portions 11 b-1 and 12 b-1 are opposed to the fins 21 a disposed on the rotor 21.
- the abradable portions 11b-1 and 12b-1 are made of a free-cutting member.
- the influence on the performance is small, and the fin 21a is hardly lost. Therefore, the abradable portions 11b-1 and 12b-1 can be brought close to the limit position where they contact the fins 21a.
- the abradable seal rings 11 and 12 are provided with abradable portions 11b-1 and 12b-1 of free-cutting members, so that the rotor 21 (or fins disposed on the rotor 21) during rated operation is provided.
- the clearance between 21a) and the abradable seal rings 11, 12 can be set to a minimum, and the amount of leakage can be reduced.
- the abradable seal rings 11 and 12 have an ACC seal structure.
- the positions of the abradable seal rings 11 and 12 are adjusted by springs (not shown) arranged in each, and operated to the rotor 21 side by the back pressure (steam pressure) immediately before reaching the rating. is there. That is, a spring force is applied so that the abradable seal rings 11 and 12 are pressed radially outward. Then, the following controls 1 to 3 are performed.
- the second expansion portion 12b of the second abradable seal ring 12 at the rear stage is the first expansion of the first abradable seal ring 11 at the front stage.
- a part of each other overlaps in the radial direction so that the portion 11b can be pressed radially inward.
- the second expanded portion 12b of the second abradable seal ring 12 at the rear stage is formed with a convex portion 12b-2 in which a part of the upstream side (the first abradable seal ring 11 side) is further expanded.
- the convex portion 12b-2 extends in the circumferential direction of the extended portion 12b.
- first expanded portion 11b of the first abradable seal ring 11 at the front stage is formed with a recessed portion 11b-2 in which a part of the downstream side (second abradable seal ring 12 side) is recessed.
- the recessed part 11b-2 is extended
- the recessed part 11b-2 and the convex part 12b-2 shall be formed in the outer peripheral surface of the expansion parts 11b and 12b, respectively (namely, said "part” means an expansion part) 11b and 12b).
- the concave portion 11b-2 has a shape corresponding to the convex portion 12b-2, and the concave portion 11b-2 of the first abradable seal ring 11 is inserted by inserting the convex portion 12b-2 into the concave portion of the concave portion 11b-2.
- the second wall surface and the convex portion 12b-2 of the second abradable seal ring 12 overlap each other.
- the axial end of the extended portion 11b of the first abradable seal ring 11 at the front stage is connected to the second abradable seal ring 12 at the rear stage facing the first abradable seal ring 12.
- the axial end portions of the extended portions 12b overlap each other in the radial direction so that they can be pressed in the radial direction.
- the abradable seal rings 11 and 12 can operate smoothly inward in the radial direction without variation in operation timing.
- the back pressure is not generated, and the abradable seal rings 11 and 12 are not affected by each other by the spring force and move radially outward and are pressed toward the outer peripheral side wall surface 23a-1.
- the convex part 12b-2 is pressed radially outward by the wall surface of the concave part 11b-2, so that the second The braidable seal ring 12 also returns to the state before operation.
- the clearance control type seal structure according to the first embodiment of the present invention can be assembled relatively easily by first assembling the second abradable seal ring 12 at the subsequent stage.
- the clearance control type seal structure according to the first embodiment of the present invention has been described above.
- the clearance control type seal structure according to the first embodiment of the present invention has a shaft with respect to the inner peripheral surface of the housing in the turbine.
- a plurality of arc-shaped grooves formed side by side in the direction, a fitting part fitted in the groove with a predetermined gap, and an expansion that is exposed radially inward from the housing and extends in the axial direction
- a plurality of seal rings that receive a force that moves inward in the radial direction due to the back pressure inside the groove during operation, and at least one of the plurality of seal rings that is adjacent in the axial direction.
- the second expansion portion which is the expansion portion of the second seal ring, radiates the first expansion portion, which is the expansion portion of the first seal ring.
- a portion of one another are overlapping in the radial direction.
- the second extended portion is formed with a convex portion further extended toward the upstream side in the axial direction on the outer peripheral surface of the upstream end portion, and the first extended portion is formed on the outer peripheral surface of the downstream end portion.
- the concave portion corresponding to the convex portion is formed, and the convex portion is inserted into the concave portion.
- each abradable seal ring can be reliably operated at a desired timing.
- Example 2 The clearance control type seal structure according to Example 2 of the present invention is obtained by changing a part of the clearance control type seal structure according to Example 1 of the present invention.
- the following description will focus on the differences from the clearance control type seal structure according to the first embodiment of the present invention, and the description of the same configuration will be omitted as much as possible.
- FIG. 2 is a cross-sectional view illustrating a clearance control type seal structure according to Embodiment 2 of the present invention.
- the same components as those in the first embodiment are denoted by the same reference numerals as those in FIG.
- the clearance control type seal structure according to the second embodiment of the present invention includes a first extension portion 31 b and a second extension of the first abradable seal ring 31 and the second abradable seal ring 32.
- the positions where the concave portions 31b-2 and the convex portions 32b-2 are formed are the concave portions in the first extended portion 11b and the second extended portion 12b of the clearance control type seal structure according to the first embodiment of the invention. 11b-2 and the convex part 12b-2.
- the concave portion 31b-2 and the convex portion 32b-2 have a predetermined length (length) from the outer peripheral surfaces of the first extended portion 31b and the second extended portion 32b, respectively. a) It is formed at a radially inner position.
- the convex part 32b-2 of the 2nd expansion part 32b is inserted in the recessed part 31b-2 of the 1st expansion part 31b, and both radial direction side wall surfaces of the recessed part 31b-2 pinch
- the clearance control type seal structure according to the second embodiment of the present invention is not only at the time of pressure increase, but also when the abradable seal rings 31 and 32 return to the outside in the radial direction at the time of pressure decrease (during stop).
- the second abradable seal ring 32 can press the first abradable seal ring 31 in the previous stage.
- the concave portion 31b-2 is formed in the first extended portion 31b of the first abradable seal ring 31, and the convex portion 32b-2 is formed in the second extended portion 32b of the second abradable seal ring 32.
- a convex portion 32b-2 is formed on the first extended portion 31b of the first abradable seal ring 31, and the second extended portion of the second abradable seal ring 32 is formed.
- a recess 31b-2 may be formed in 32b.
- the clearance control type seal structure according to the second embodiment of the present invention includes an upstream end at the second expansion portion.
- a convex portion that is further expanded toward the upstream side in the axial direction (the first abradable seal ring 11 side) is formed on the inner side in the predetermined major axis direction from the outer peripheral surface of the portion, and the first extended portion has a downstream end portion.
- a concave portion corresponding to the convex portion is formed inside the predetermined major axis direction from the outer peripheral surface, and the convex portion is inserted into the concave portion.
- the convex portion and the concave portion may be reversed. That is, the first extended portion is formed with a convex portion that is further expanded toward the downstream side in the axial direction (the second abradable seal ring 12 side) on the inner side in the predetermined major axis direction from the outer peripheral surface of the downstream end portion, The second extended portion may be formed with a concave portion corresponding to the convex portion on the inner side in a predetermined major axis direction from the outer peripheral surface of the upstream end portion, and the convex portion is inserted into the concave portion.
- the clearance control type seal structure according to the second embodiment of the present invention can reliably operate each abradable seal ring at a desired timing.
- Example 3 The clearance control type seal structure according to Example 3 of the present invention is obtained by changing a part of the clearance control type seal structure according to Example 1 of the present invention.
- the following description will focus on the differences from the clearance control type seal structure according to the first embodiment of the present invention, and the description of the same components will be omitted as much as possible.
- FIG. 3 is a cross-sectional view illustrating a clearance control type seal structure according to a third embodiment of the present invention.
- the same components as those of the first embodiment are denoted by the same reference numerals as those in FIG.
- the shape of the second expansion portion 42b is the second expansion portion 12b of the clearance control type seal structure according to the first embodiment of the present invention. The shape is different.
- the second expanded portion 42b of the second abradable seal ring 42 has a metal arcuate flat plate portion 42b-2 and a second concave portion 42b-3. ing.
- the second concave portion 42b-3 is formed at a position radially inward from the outer peripheral surface of the upstream end portion of the second extension portion 42b by a predetermined length (length b), and the arc-shaped flat plate portion 42b-2 is Embodiments 1 and 2 have a shape corresponding to the second recess 42b-3, and a part in the axial direction is inserted into the second recess 42b-3 and has a predetermined width (for a length c) in the axial direction. It plays the role of the convex portions 12b-2 and 32b-2.
- a (first) recess 41b-2 is formed on the downstream side of the first expansion part 41b of the first abradable seal ring 41.
- the concave portion 41b-2 has a shape corresponding to the arc-shaped flat plate portion 42b-2.
- the wall surface of the recess 41b-2 of the first abradable seal ring 41 and the circle of the second abradable seal ring 42 are provided.
- the arc-shaped flat plate portion 42b-2 is overlapped.
- the concave portion 41b-2 is shown as a shape having only one side of the radial side wall surface as in the concave portion 11b-2 (FIG. 1) of the first embodiment.
- the present embodiment is not limited to this. It is good also as what has a radial direction side wall surface in both sides like the recessed part 31b-2 (FIG. 2) of Example 2 instead.
- the clearance control type seal structure according to the third embodiment of the present invention has an arcuate flat plate portion 42b- between the axial end portions of the first abradable seal ring 41 and the second abradable seal ring 42.
- the arc-shaped flat plate portion 42 b-2 plays the role of the convex portions 12 b-2 and 32 b-2 in the first and second embodiments, and the operation of the second abradable seal ring 42 in the rear stage is performed in the front stage.
- the first abradable seal ring 41 To the first abradable seal ring 41.
- the arc-shaped flat plate portion 42b-2 is inserted after the abradable seal rings 41 and 42 are individually assembled with the above configuration. As a result, the assemblability is improved.
- the clearance control type seal structure according to the third embodiment of the present invention includes an upstream end at the second expansion portion.
- a second concave portion is formed on the inner side in a predetermined major axis direction from the outer peripheral surface of the portion, and a part of the arc-shaped flat plate portion having a shape corresponding to the second concave portion is inserted into the second concave portion, and the first extension portion
- a first recess corresponding to the arc-shaped flat plate portion is formed, and the arc-shaped flat plate portion is partially inserted into the first recess.
- the clearance control type seal structure according to the present invention has been described in the first to fourth embodiments.
- the clearance control type seal structure according to the present invention may be applied to all series of abradable seal rings or operated. It may be applied only to some abradable seal rings with poor properties.
- the first stage is described as the first abradable seal ring 11 and the second stage is described as the second abradable seal ring 12.
- the first abradable seal ring 11 and the second abradable seal are described. It does not matter which of the rings 12 is the front stage and which is the rear stage. That is, the magnitude
- the description in the first to fourth embodiments is valid even if the context is changed. .
- each abradable seal ring when operating the ACC, the influence of frictional resistance can be reduced, and each abradable seal ring can be operated reliably at a desired timing.
- the present invention is suitable as a clearance control type seal structure.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Sealing Devices (AREA)
Abstract
Description
タービンにおけるハウジングの内周面に対し、軸方向に複数並んで形成された、円弧状の溝と、
前記溝に所定の隙間を有して嵌合された嵌合部、及び、前記ハウジングから径方向内側へ露出し軸方向に拡張した拡張部を有し、運転中、前記溝内部の背面圧力により径方向内側へ向け移動する力を受ける、複数のシールリングとを備え、
前記複数のシールリングのうち、少なくとも、軸方向に隣り合う第1シールリング及び第2シールリングにおいて、
前記第1シールリングは前記第2シールリングよりも高負荷で作動するものとし、
前記第2シールリングの前記拡張部である第2拡張部が、前記第1シールリングの前記拡張部である第1拡張部を径方向内側に押圧可能とするように、互いの一部が径方向に重複している
ことを特徴とする。
上記第1の発明に係るクリアランス制御型シール構造において、
前記第2拡張部には、
前記第1シールリング側端部の外周面において、前記第1シールリング側に向けさらに拡張した凸部が形成され、
前記第1拡張部には、
前記第2シールリング側端部の外周面において、前記凸部に対応する凹部が形成され、
前記凸部が前記凹部に挿入されている
ことを特徴とする。
上記第1の発明に係るクリアランス制御型シール構造において、
前記第2拡張部には、
前記第1シールリング側端部の外周面から所定長径方向内側において、前記第1シールリング側に向けさらに拡張した凸部が形成され、
前記第1拡張部には、
前記第2シールリング側端部の外周面から所定長径方向内側において、前記凸部に対応する凹部が形成され、
前記凸部が前記凹部に挿入されている
ことを特徴とする。
上記第1の発明に係るクリアランス制御型シール構造において、
前記第1拡張部には、
前記第2シールリング側端部の外周面から所定長径方向内側において、前記第2シールリング側に向けさらに拡張した凸部が形成され、
前記第2拡張部には、
前記第1シールリング側端部の外周面から所定長径方向内側において、前記凸部に対応する凹部が形成され、
前記凸部が前記凹部に挿入されている
ことを特徴とする。
上記第1の発明に係るクリアランス制御型シール構造において、
前記第2拡張部には、
前記第1シールリング側端部の外周面から所定長径方向内側において、第2凹部が形成され、
前記第2凹部には、該第2凹部に対応する形状の円弧状平板部の一部が挿入され、
前記第1拡張部には、
前記円弧状平板部に対応する第1凹部が形成され、
前記円弧状平板部が前記第1凹部に一部挿入されている
ことを特徴とする。
上記第1の発明に係るクリアランス制御型シール構造を有することを特徴とする。
上記第2の発明に係るクリアランス制御型シール構造を有することを特徴とする。
上記第3の発明に係るクリアランス制御型シール構造を有することを特徴とする。
上記第4の発明に係るクリアランス制御型シール構造を有することを特徴とする。
上記第5の発明に係るクリアランス制御型シール構造を有することを特徴とする。
図1は、本発明の実施例1に係るクリアランス制御型シール構造を説明する断面図である。本発明の実施例1に係るクリアランス制御型シール構造は、タービンに用いられるものであり、図1に示すように、まずアブレイダブルシールリング11,12、及び、複数の溝23を備えている。
アブレイダブルシールリング11,12は、ばね力により、溝23の拡大部23aの外周側壁面23a‐1へ向けて押し付けられる。
2.起動時(負荷上昇時、差圧低)
溝23の拡大部23aの内部において、アブレイダブルシールリング11,12を径方向内側へ押圧する背面圧力が発生するが、ばね力>背面圧力の範囲では、アブレイダブルシールリング11,12は依然として外周側壁面23a‐1へ向けて押し付けられている。なお、停止時も同様である。
3.定格運転時(負荷50%以上、差圧高)
定格運転直前に、背面圧力>(ばね力+摩擦力)となると、アブレイダブルシールリング11,12は、溝23の内周側壁面23a‐2に押し付けられる。
本発明の実施例2に係るクリアランス制御型シール構造は、本発明の実施例1に係るクリアランス制御型シール構造の一部を変更したものである。以下、本発明の実施例1に係るクリアランス制御型シール構造と異なる点を中心に説明し、同一の構成については、極力説明を省略する。
本発明の実施例3に係るクリアランス制御型シール構造は、本発明の実施例1に係るクリアランス制御型シール構造の一部を変更したものである。以下、本発明の実施例1に係るクリアランス制御型シール構造と異なる点を中心に説明し、同一の構成部分については、極力説明を省略する。
11a 第1嵌合部
11b,31b 第1拡張部
11b‐1 第1アブレイダブル部
11b‐2,31b‐2,41b‐2 凹部
12,32,42 第2アブレイダブルシールリング
12a 第2嵌合部
12b,32b 第2拡張部
12b‐1 第2アブレイダブル部
12b‐2,32b‐2 凸部
42b‐2 円弧状平板部
42b‐3 第2凹部
21 ロータ
21a フィン
22 ハウジング
23 溝
23a 拡大部
23a‐1 外周側壁面
23a‐2 内周側壁面
Claims (10)
- タービンにおけるハウジングの内周面に対し、軸方向に複数並んで形成された、円弧状の溝と、
前記溝に所定の隙間を有して嵌合された嵌合部、及び、前記ハウジングから径方向内側へ露出し軸方向に拡張した拡張部を有し、運転中、前記溝内部の背面圧力により径方向内側へ向け移動する力を受ける、複数のシールリングとを備え、
前記複数のシールリングのうち、少なくとも、軸方向に隣り合う第1シールリング及び第2シールリングにおいて、
前記第1シールリングは前記第2シールリングよりも高負荷で作動するものとし、
前記第2シールリングの前記拡張部である第2拡張部が、前記第1シールリングの前記拡張部である第1拡張部を径方向内側に押圧可能とするように、互いの一部が径方向に重複している
ことを特徴とする、クリアランス制御型シール構造。 - 前記第2拡張部には、
前記第1シールリング側端部の外周面において、前記第1シールリング側に向けさらに拡張した凸部が形成され、
前記第1拡張部には、
前記第2シールリング側端部の外周面において、前記凸部に対応する凹部が形成され、
前記凸部が前記凹部に挿入されている
ことを特徴とする、請求項1に記載のクリアランス制御型シール構造。 - 前記第2拡張部には、
前記第1シールリング側端部の外周面から所定長径方向内側において、前記第1シールリング側に向けさらに拡張した凸部が形成され、
前記第1拡張部には、
前記第2シールリング側端部の外周面から所定長径方向内側において、前記凸部に対応する凹部が形成され、
前記凸部が前記凹部に挿入されている
ことを特徴とする、請求項1に記載のクリアランス制御型シール構造。 - 前記第1拡張部には、
前記第2シールリング側端部の外周面から所定長径方向内側において、前記第2シールリング側に向けさらに拡張した凸部が形成され、
前記第2拡張部には、
前記第1シールリング側端部の外周面から所定長径方向内側において、前記凸部に対応する凹部が形成され、
前記凸部が前記凹部に挿入されている
ことを特徴とする、請求項1に記載のクリアランス制御型シール構造。 - 前記第2拡張部には、
前記第1シールリング側端部の外周面から所定長径方向内側において、第2凹部が形成され、
前記第2凹部には、該第2凹部に対応する形状の円弧状平板部の一部が挿入され、
前記第1拡張部には、
前記円弧状平板部に対応する第1凹部が形成され、
前記円弧状平板部が前記第1凹部に一部挿入されている
ことを特徴とする、請求項1に記載のクリアランス制御型シール構造。 - 請求項1に記載のクリアランス制御型シール構造を有することを特徴とするタービン。
- 請求項2に記載のクリアランス制御型シール構造を有することを特徴とするタービン。
- 請求項3に記載のクリアランス制御型シール構造を有することを特徴とするタービン。
- 請求項4に記載のクリアランス制御型シール構造を有することを特徴とするタービン。
- 請求項5に記載のクリアランス制御型シール構造を有することを特徴とするタービン。
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US20170328232A1 (en) | 2017-11-16 |
JP6161208B2 (ja) | 2017-07-12 |
KR20170061154A (ko) | 2017-06-02 |
KR102102028B1 (ko) | 2020-04-20 |
CN107075964A (zh) | 2017-08-18 |
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