CN110925029A - Single crystal turbine rotor blade tenon plugging assembly structure and assembly method - Google Patents
Single crystal turbine rotor blade tenon plugging assembly structure and assembly method Download PDFInfo
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- CN110925029A CN110925029A CN201911236429.XA CN201911236429A CN110925029A CN 110925029 A CN110925029 A CN 110925029A CN 201911236429 A CN201911236429 A CN 201911236429A CN 110925029 A CN110925029 A CN 110925029A
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- plug
- plugging cover
- cover
- trapezoidal groove
- groove
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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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/04—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass turbine or like blades from several pieces
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention provides a blade tenon plugging cover assembling structure of a single crystal turbine rotor, which comprises a blade tenon (1), an air inlet (2), a trapezoidal groove (3) and a plugging cover (4); the trapezoidal groove (3) is arranged at the hole opening of the air inlet hole (2). The tenon plug assembling structure of the single crystal turbine rotor blade, provided by the invention, has a simple structure, can be assembled only on a bench without large-scale equipment such as heat treatment or rolling, and is low in cost, simple to operate and high in assembling efficiency.
Description
Technical Field
The invention belongs to the field of aero-engines, and particularly relates to a structure and a method for assembling a tenon plug cover of a blade of a single-crystal turbine rotor in an engine gas turbine
Background
The turbine rotor blade is one of important parts in an aircraft engine and a gas turbine, and is easy to have faults of ablation, breakage and the like due to high thermal load. Therefore, the turbine rotor blade is generally of a hollow structure, cooling air is introduced from an air inlet at the bottom of a blade tenon, and the cooling air is finally discharged into gas from a tail seam and a gas film hole after impact and convective heat exchange are carried out in an inner cavity of the blade. In order to efficiently cool the blades, the inner cavities of the blades are designed into a complex multi-cavity structure, and comprise snake-shaped cavities, impact cavities and the like, and the individual cavities are also designed with transverse ribs and a streaming column structure to enhance heat exchange. In general, the amount of blade cooling air allocated to the air system cooling flow path is constant, and a turbine blade cooling design is required to be elaborate, so that the maximum cooling is realized by using the minimum amount of cooling air. Therefore, the amount of cooling air provided to each cavity channel must be precisely controlled, and not wasted, nor absent cooling air, to cause blade erosion.
The cold air quantity of each inner cavity channel is realized by controlling the area of an air inlet hole at the bottom of the tenon, and when the area of an air inlet hole at the bottom of a tenon is not expected to be too large, a plugging cover needs to be assembled for plugging. In the prior art, the design of the blanking cap mainly comprises the following methods, the first method adopts a brazing mode to assemble the blanking cap at the bottom of the tenon, as shown in figure 6, a groove is machined at the bottom of the tenon, the wall surface of the groove is a vertical surface, the groove is slightly wider than a hole to be plugged, the blanking cap with the thickness equal to the depth of the groove and the width equal to the width of the groove is assembled and brazed, a small round hole is formed in the blanking cap, the size of the round hole can be determined according to needs, but the method has high machining cost and long time period, and due to the introduction of a brazing thermal technology, the brazing temperature reaches more than 1000 ℃, and uncertainty influence is brought to the tissue performance of a single crystal blade. Another method of plugging is to assemble a plugging cover at the bottom of the tenon by adopting a rolling way, as shown in fig. 7, the bottom of the tenon is provided with a groove, the wall surfaces in the front and back directions of the groove and a vertical surface form an included angle smaller than 30 degrees and form a parallelogram, other wall surfaces are vertical surfaces, the plugging cover also forms a parallelogram, after the plugging cover is assembled, the edge of the groove of the blade is deformed by using a ball head rolling closing-up way with the diameter of 3-6 mm, and the effect of clamping the plugging cover is achieved.
Therefore, it is necessary to provide a plugging cover assembly structure which is suitable for a single crystal blade, does not generate recrystallization and cracks in the blade in an assembly mode, has no influence on the tissue performance of the blade, and is low in cost and short in assembly period.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems, the invention provides a plugging cover assembly structure suitable for a single crystal blade, which does not generate recrystallization and cracks on the blade, has no influence on the tissue performance of the blade, and has low cost and short assembly period.
Technical scheme
The invention provides a blade tenon plugging cover assembling structure of a single crystal turbine rotor, which comprises a blade tenon (1), an air inlet (2), a trapezoidal groove (3) and a plugging cover (4);
the trapezoidal groove (3) is arranged at the hole opening of the air inlet hole (2).
Preferably, the notch of the trapezoidal groove (3) is in an inverted trapezoid shape, the notch is narrow and wide at the bottom, the groove depth H is 1.5-3 mm, the included angle β between the front wall surface and the vertical surface of the groove and the vertical surface is 10-30 degrees, the ratio of the notch length L2 to the air inlet hole length is 1.6-3: 1, and the ratio of the notch width B2 to the air inlet hole width is 1.5-2.5: 1.
Preferably, the plugging cover (4) is V-shaped before assembly, a round hole (5) is arranged in the middle, the ratio of the thickness t of the plugging cover (4) to the depth H of the trapezoidal groove is 1.5-2: 1, the length of the plugging cover (4) before assembly is consistent with the length L2 of the notch of the trapezoidal groove (3), the width B1 of the plugging cover is the same as the width of the notch of the trapezoidal groove (3), the diameter of the round hole (5) is phi 1-phi 3 mm, the V-shaped clamp angle α of the plugging cover (4) is 130-150 degrees, and the ratio of the length L1 of the plugging cover (4) after assembly to the length before assembly is 1.2-1.5: 1.
Another object of the present invention is to provide an assembling method of the tenon plug assembling structure of a single crystal turbine rotor blade, comprising the steps of:
(1): processing a trapezoidal groove at an air inlet at the bottom of the blade tenon by adopting electric sparks;
(2): pressing and molding the sheet metal part by using a mold to form a V-shaped plugging cover;
(3): and (3) outwards arranging the top high point of the V-shaped plugging cover, assembling the V-shaped plugging cover into the trapezoidal groove, and applying force to the top high point to flatten the V-shaped plugging cover.
(4): checking the tightness of the V-shaped plugging cover through the round hole on the V-shaped plugging cover, and further flattening the V-shaped plugging cover or replacing the plugging cover with different sizes if the V-shaped plugging cover is loosened; and if the looseness does not exist, the assembly is finished.
Advantageous effects
The tenon plug assembling structure of the single crystal turbine rotor blade, provided by the invention, has a simple structure, can be assembled only on a bench without large-scale equipment such as heat treatment or rolling, and is low in cost, simple to operate and high in assembling efficiency.
The single crystal turbine rotor blade tenon blanking cover assembly structure provided by the invention only deforms the blanking cover, does not deform or crack a single crystal blade, avoids the possibility of blade recrystallization, does not adopt a thermal process, has no influence on the single crystal structure performance of the blade, and improves the use reliability of the blade.
Drawings
Fig. 1 is a schematic diagram of the assembled plug assembling structure provided by the invention.
Fig. 2 is an assembly schematic view of the assembling structure of the plugging cover provided by the invention.
Fig. 3 is a structural view of a trapezoidal groove in the plug assembling structure provided by the invention.
Fig. 3a is a cross-sectional view of a trapezoidal groove in the closure assembling structure according to the present invention.
Fig. 3b is a bottom view of the trapezoidal groove in the plug assembling structure according to the present invention.
Fig. 4 is a view showing the structure of the V-shaped block cover in the block cover assembling structure provided by the present invention.
Fig. 4a is a front view of a V-shaped cap in the cap assembly configuration provided by the present invention.
Fig. 4b is a bottom view of the V-shaped plug in the plug mounting structure according to the present invention.
FIG. 5 is a partial schematic view of a turbine rotor blade
FIG. 6 is a schematic view of a bottom blanking cover structure of a tenon assembled by brazing
FIG. 7 is a schematic view of a structure of a bottom block cover of an assembly tenon by a rolling method
Wherein: 1: a blade tenon; 2: an air inlet; 3: a trapezoidal groove; 4: blocking the cover; 5: a circular hole.
Detailed Description
The invention will be further explained with reference to the drawings
As shown in figure 5, which is a partial schematic view of a turbine rotor blade, a cavity I and a cavity II are separated by a partition plate, a small hole communicating the cavity I and the cavity II is formed in the partition plate, and cold air enters the cavity I and the cavity II from an air inlet hole ① and a hole ② in a tenon respectively.
Fig. 6 is a schematic view of a prior art tenon bottom closure assembly using brazing. Processing a groove at the bottom of the tenon, wherein the wall surface of the groove is a vertical surface, the groove is slightly wider than a hole to be plugged, and the groove is brazed after a plug cover with the thickness equal to the depth of the groove and the width equal to the groove is assembled. The blocking cover is provided with a small round hole, and the size of the round hole can be determined according to the requirement. The method has high processing cost and long time period, and due to the introduction of a brazing thermal process, the brazing temperature reaches over 1000 ℃, thereby bringing uncertain influence on the structural performance of the single crystal blade.
Fig. 7 is a schematic view of a conventional assembly tenon bottom cap structure by a rolling method. The bottom of the tenon is provided with a groove, the wall surfaces of the front and back directions of the groove and the vertical surface form an included angle of less than 30 degrees, the included angle is parallelogram, and other wall surfaces are vertical surfaces. The blanking cover is also in a parallelogram shape. After the plugging cover is assembled, the edge of the groove of the blade is deformed by a ball head rolling closing-in mode with the diameter of 3-6 mm, and the effect of clamping the plugging cover is achieved. The mode is easy to crack due to the fact that the edge of the groove of the blade deforms, and the single crystal blade is extremely sensitive to deformation and easy to recrystallize, so that cracks and even breakage occur when the blade works.
As shown in figures 1-4, the plug cover assembling structure comprises a blade rabbet 1, an air inlet 2, a trapezoidal groove 3 and a plug cover 4, wherein the trapezoidal groove 3 is arranged in an orifice of the air inlet 2, a notch of the trapezoidal groove 3 is in an inverted trapezoid shape, the notch is narrow and wide in bottom, the groove depth H is 1.5-3 mm, an included angle β between the front wall surface and the vertical surface of the groove and the rear wall surface of the groove is 10-30 degrees, the ratio of the notch length L2 to the air inlet length is 1.6-3: 1, the ratio of the notch width B2 to the air inlet width is 1.5-2.5: 1, the plug cover 4 is in a V shape before assembling, a round hole 5 is arranged in the middle, the ratio of the thickness t of the plug cover 4 to the trapezoidal groove depth H is 1.5-2: 1, the length of the plug cover 4 before assembling is consistent with the notch length L2 of the trapezoidal groove, the width B1 is the same as the notch width of the trapezoidal groove 3, the diameter of the round hole 5 is 1-3 mm, and the plug cover 4 is 464-1-150-1-4 angle before assembling.
The assembling method of the assembling structure comprises the following steps:
(1): processing a trapezoidal groove at an air inlet at the bottom of the blade tenon by adopting electric sparks;
(2): pressing and molding the sheet metal part by using a mold to form a V-shaped plugging cover;
(3): and (3) outwards arranging the top high point of the V-shaped plugging cover, assembling the V-shaped plugging cover into the trapezoidal groove, and applying force to the top high point to flatten the V-shaped plugging cover.
(4): checking the tightness of the V-shaped plugging cover through the round hole on the V-shaped plugging cover, and further flattening the V-shaped plugging cover or replacing the plugging cover with different sizes if the V-shaped plugging cover is loosened; and if the looseness does not exist, the assembly is finished.
The working principle is as follows:
the dovetail groove at the bottom of the blade tenon is processed by electric spark, and the blocking cover is formed by sheet metal parts. Before the plug cover is flattened, the plug cover is proper in size and can be just placed into the trapezoidal groove, then a tool is used for applying force to a high point at the top of the plug cover, and the plug cover is flattened by adopting a static pressure method. Because the blocking cover is lengthened after being flattened, the blocking cover cannot be separated from the trapezoidal groove of the narrow opening, and the purpose of assembling and fastening is realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A single crystal turbine rotor blade tenon blanking cover assembling structure is characterized by comprising a blade tenon (1), an air inlet (2), a trapezoidal groove (3) and a blanking cover (4); the trapezoidal groove (3) is arranged at the hole opening of the air inlet hole (2).
2. The structure for assembling the tenon plug of the blade of the single crystal turbine rotor according to claim 1, wherein the notch of the trapezoidal groove (3) is in an inverted trapezoid shape, the notch is narrow and wide in bottom, the groove depth H is 1.5-3 mm, the included angle β between the front wall surface and the vertical surface of the groove and the rear wall surface of the groove is 10-30 degrees, the ratio of the length L2 of the notch to the length of the air inlet hole is 1.6-3: 1, and the ratio of the width B2 of the notch to the width of the air inlet hole is 1.5-2.5: 1.
3. The blade tenon plug assembling structure of the single crystal turbine rotor according to claim 1, wherein the plug (4) is V-shaped before assembly, a round hole (5) is formed in the middle of the plug, the ratio of the thickness t of the plug (4) to the depth H of the trapezoidal groove is 1.5-2: 1, the length of the plug (4) before assembly is consistent with the length L2 of the notch of the trapezoidal groove (3), the width B1 of the plug is the same as the notch width of the trapezoidal groove (3), the diameter of the round hole (5) is phi 1-phi 3 mm, the V-shaped clip angle α of the plug (4) is 130-150 degrees, and the ratio of the length L1 of the plug (4) after assembly to the length before assembly is 1.2-1.5: 1.
4. The method of assembling a single crystal turbine rotor blade tenon plug assembly structure of any one of claims 1 to 3, wherein: the method comprises the following steps:
(1): processing a trapezoidal groove at an air inlet at the bottom of the blade tenon by adopting electric sparks;
(2): pressing and molding the sheet metal part by using a mold to form a V-shaped plugging cover;
(3): and (3) outwards arranging the top high point of the V-shaped plugging cover, assembling the V-shaped plugging cover into the trapezoidal groove, and applying force to the top high point to flatten the V-shaped plugging cover.
(4): checking the tightness of the V-shaped plugging cover through the round hole on the V-shaped plugging cover, and further flattening the V-shaped plugging cover or replacing the plugging cover with different sizes if the V-shaped plugging cover is loosened; and if the looseness does not exist, the assembly is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911236429.XA CN110925029A (en) | 2019-12-05 | 2019-12-05 | Single crystal turbine rotor blade tenon plugging assembly structure and assembly method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911236429.XA CN110925029A (en) | 2019-12-05 | 2019-12-05 | Single crystal turbine rotor blade tenon plugging assembly structure and assembly method |
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| Publication Number | Publication Date |
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| CN110925029A true CN110925029A (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911236429.XA Pending CN110925029A (en) | 2019-12-05 | 2019-12-05 | Single crystal turbine rotor blade tenon plugging assembly structure and assembly method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102197193A (en) * | 2008-10-22 | 2011-09-21 | 斯奈克玛 | Turbine blade equipped with means of adjusting its cooling fluid flow rate |
| CN106523038A (en) * | 2016-12-25 | 2017-03-22 | 东方电气集团东方汽轮机有限公司 | Configuration structure of hollow blade cooling medium throttling hole plate and assembly method thereof |
| US20170138200A1 (en) * | 2015-07-20 | 2017-05-18 | Rolls-Royce Deutschland Ltd & Co Kg | Cooled turbine runner, in particular for an aircraft engine |
| CN108180043A (en) * | 2017-12-25 | 2018-06-19 | 中国航发动力股份有限公司 | A kind of assembling structure and method of turbo blade tenon tooth bottom surface cover board |
| CN208907370U (en) * | 2018-11-08 | 2019-05-28 | 哈尔滨电气股份有限公司 | A kind of rotor blade of adjustable cooling circuit air conditioning quantity distribution |
-
2019
- 2019-12-05 CN CN201911236429.XA patent/CN110925029A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102197193A (en) * | 2008-10-22 | 2011-09-21 | 斯奈克玛 | Turbine blade equipped with means of adjusting its cooling fluid flow rate |
| US20170138200A1 (en) * | 2015-07-20 | 2017-05-18 | Rolls-Royce Deutschland Ltd & Co Kg | Cooled turbine runner, in particular for an aircraft engine |
| CN106523038A (en) * | 2016-12-25 | 2017-03-22 | 东方电气集团东方汽轮机有限公司 | Configuration structure of hollow blade cooling medium throttling hole plate and assembly method thereof |
| CN108180043A (en) * | 2017-12-25 | 2018-06-19 | 中国航发动力股份有限公司 | A kind of assembling structure and method of turbo blade tenon tooth bottom surface cover board |
| CN208907370U (en) * | 2018-11-08 | 2019-05-28 | 哈尔滨电气股份有限公司 | A kind of rotor blade of adjustable cooling circuit air conditioning quantity distribution |
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Application publication date: 20200327 |