CN111255526A - Fir-shaped disc tenon connecting device - Google Patents
Fir-shaped disc tenon connecting device Download PDFInfo
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- CN111255526A CN111255526A CN202010158499.4A CN202010158499A CN111255526A CN 111255526 A CN111255526 A CN 111255526A CN 202010158499 A CN202010158499 A CN 202010158499A CN 111255526 A CN111255526 A CN 111255526A
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- tooth
- tenon
- falcon
- tongue
- 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
- F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention relates to a fir-tree-shaped disc tenon connecting device which comprises a tenon head and a mortise slot which are connected in a matched mode, wherein the tenon head comprises a first tenon tooth and a second tenon tooth, the first tenon tooth and the second tenon tooth are symmetrically arranged in structure, tooth widths of tooth surfaces arranged on the first tenon tooth and the second tenon tooth are respectively equal to tooth widths of a lower plane, pressure angles of the tooth surfaces are the same, tooth end surfaces of the second tenon tooth are planes, the mortise slot comprises a first tenon slot and a second tenon slot, the first tenon slot and the second tenon slot are correspondingly arranged on the tenon head, the first tenon slot and the second tenon slot are respectively provided with plane slot surfaces attached to the tooth surfaces, large circular arcs are respectively connected with the slot surfaces in a tangent mode, and a slot bottom is a plane. By adopting the device, the problem of stress concentration of the connecting part of the blade tenon and the wheel disc mortise is greatly improved, the cooling air channel between the tenon and the mortise is enlarged, the temperature of the connecting part is greatly reduced, the working reliability is good, and the high-quality requirement of an aero-engine on a turbine rotor is met.
Description
Technical Field
The invention relates to the technical field of aero-engines, in particular to a fir-type disc tenon connecting device.
Background
The aeroengine turbine rotor usually adopts fir type disc tenon connecting device to realize the assembly of turbine disc and blade, transmits power through a plurality of contact surfaces between tenon and the tongue-and-groove, and connection position operating temperature is higher, can reach 900K or even higher, and the centrifugal force that high-speed pivoted blade produced makes blade tenon and rim plate tongue-and-groove connection position produce higher stress. At present, the structure in the prior art has the characteristics of narrow structural design space, complex structural form, obvious stress concentration, high working temperature and the like, so the fir-type disc-tenon connecting structure design is always the design difficulty of a turbine part, however, along with the higher performance requirement of an aircraft engine, the working environment of the turbine part is more severe, the existing fir-type disc-tenon connecting structure cannot meet the high-quality requirement of the aircraft engine on a turbine rotor, and the working reliability is poor.
Disclosure of Invention
The invention aims to overcome the defects and provides the fir-tree-shaped disc tenon connecting device which is simple in structural form through reasonable design of structural parameters of the fir-tree-shaped tenon and the mortise matched with the fir-tree-shaped tenon, enlarges a cooling air channel between the tenon and the mortise, greatly reduces the thermal stress of the tenon, prolongs the creep life of the blade tenon and the wheel disc mortise structure, is good in working reliability, and meets the high-quality requirement of an aeroengine on a turbine rotor.
The specific technical scheme provided by the invention is as follows:
a firtree-type disk-tenon joint comprising a tenon and a mortise for mating connection, the tenon comprising: the tenon and blade combined type engine blade assembly comprises a first tenon tooth and a second tenon tooth which are symmetrically arranged and connected through arc sections with the radius not less than 0.8mm, wherein the first tenon tooth and the second tenon tooth are respectively provided with a tooth surface and a lower plane which are of planar structures, the tooth widths of the tooth surface and the lower plane are respectively equal, the pressure angles of the tooth surfaces are the same, the tooth end surfaces of the second tenon tooth are planes, and arc smooth transition is formed among each connecting surface, the tenon head and the blade;
the tongue-and-groove includes:
with the tenon corresponds the setting, and by first tongue-and-groove and the second tongue-and-groove that the circular arc section that the radius is not less than 1.3mm links to each other, first tongue-and-groove with the second tongue-and-groove all be equipped with the plane slot surface that the flank of tooth laminated mutually, and respectively with the orthodrome of tangent connection of slot surface, the orthodrome of second tongue-and-groove is connected with the plane of tank bottom is tangent.
Preferably the first and second falcon teeth each have a face pressure angle of 49 °.
Preferably, the first and second falcon teeth each have a tooth face width of 2mm, the first and second falcon teeth each have a lower planar face width of 0.9mm, and the tooth face and the lower planar face are each smoothly connected by an arc.
Preferably, the radius of the arc of the smooth connection between the first tenon tooth and the blade is 1 mm.
Preferably, the major arc radius of the first tongue is 1.4mm and the major arc radius of the second tongue is 1.1 mm.
Preferably, the first falcon tooth has a profile angle of 119 ° and the second falcon tooth has a profile angle of 94 °.
Preferably, the lower plane of the second falcon tooth is smoothly connected with the tooth end surface through a circular arc.
Preferably the first falcon tooth and the first falcon form a symmetrically arranged first cavity and the second falcon tooth and the second falcon form a second cavity, the second cavity including a gap between the slot bottom plane and the tooth end plane.
It should be noted that, through first falcon tooth with first falcon groove, second falcon tooth with the second falcon groove all is equipped with the flank of tooth of the planar structure who matches for falcon tooth and falcon groove are through upper and lower two laminating planes close-fitting together, and simple structure, the laminating is firm, has improved the problem of the stress concentration that brings through a plurality of contact surface transmission power greatly.
It should be noted that, through first falcon tooth with the setting of the lower plane of second falcon tooth first falcon groove with the setting of second falcon groove orthodrome for the equal greatly increased in space of first cavity, the second cavity that forms between falcon tooth and the falcon groove has improved the cooling effect of cooling air flow effectively, and the clearance between tank bottom plane and the tooth terminal surface plane link up with the second cavity mutually, makes the cooling air flow circulate more unobstructed on the basis of increase cooling space, has improved the cooling effect greatly, has effectively reduced tenon, tongue and groove connection position operating temperature.
It should be noted that, through the setting of each parameter value, the problems of contact surface compressive stress, shear stress and stress concentration in the structure are greatly improved, and the working reliability of the disc tenon connection part is ensured.
The invention has the beneficial effects that:
the fir-type disc tenon connecting device is simple in structural form, greatly improves the problem of stress concentration of the connecting part of the blade tenon and the wheel disc mortise, enlarges a cooling air channel between the tenon and the mortise, greatly reduces the temperature of the connecting part, prolongs the creep life of the blade tenon and the wheel disc mortise structure, has good working reliability, and meets the high-quality requirement of an aeroengine on a turbine rotor.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic view of a blade and a wheel disc of the present invention, which are connected by a tenon and a mortise;
FIG. 2 is an enlarged view A of FIG. 1;
FIG. 3 is a schematic view of a tenon construction;
fig. 4 is a schematic view of a tongue and groove structure.
Wherein: 100-blade; 200-a wheel disc; 300-mortises; 400-tenon;
310 — a first tongue and groove; 311-first upper groove surface; 312 — first arc; 313 — a first chamber;
320-a second mortise; 321 — a second upper groove surface; 322 — second arc; 323-tank bottom; 324 — a second chamber;
410 — a first cog; 411 — first tooth flank; 412 — a first lower plane;
420-a second cog; 421 — second tooth surface; 422 — a second lower plane; 423-tooth end face;
430-tooth necking.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. Moreover, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
As shown in fig. 1-4:
in one embodiment of the present invention, a fir-tree disc-tenon joint apparatus includes a tenon 400 of a bucket 100 and a mortise 300 of a disk 200 which are coupled in a mating manner, the tenon 400 including:
the mortise 300 includes:
a circular arc R with the radius not less than 1.3mm and arranged corresponding to the tenon 4007The first tongue 310 and the second tongue 320 may be connected, the first tongue 310 and the second tongue 320 may be provided with a first upper groove surface 311 and a second upper groove surface 321, the first upper groove surface 311 and the radius R being attached to each other, and the first tooth surface 421 and the second tooth surface 411 being attached to each other6Said first great arc 312 is tangentially connected, saidSecond upper groove surface 321 and radius R8The second great arc 322 of the second tongue groove 320 is tangentially connected, and the second great arc 322 of the second tongue groove 320 is tangentially connected to the plane of the groove bottom 323.
The fir-tree-shaped disc tenon connecting device is simple in structure and firm in fitting, and the problem of stress concentration caused by force transmission through a plurality of contact surfaces is greatly solved; the equal greatly increased in space has improved cooling air's cooling effect effectively, and the clearance between tank bottom plane and the tooth terminal surface plane link up with the second cavity mutually, makes the cooling air circulation more unobstructed on the basis of increase cooling space, has improved the cooling effect greatly, has effectively reduced tenon, tongue-and-groove connection position operating temperature.
Preferably, a pressure angle β of the first face 411 of the first falcon tooth 4101A pressure angle β with said second tooth face 421 of said second falcon 4202Are all 49 degrees.
Preferably, tooth face widths w of the first and second falcon teeth 410 and 4201、w3Each 2mm, a lower planar tooth width w of the first and second teeth 410, 4202、w4Each 0.9mm, the first tooth face 411 of the first falcon tooth 410 and the first lower plane 412 pass through a radius R2The second tooth face 421 and the second lower plane 422 of the second falcon tooth 420 are smoothly connected through a radius R in a circular arc of 0.5mm4Is in smooth connection with a circular arc of 0.5 mm;
preferably, a radius R of an arc where the first falcon tooth 410 is smoothly connected with the blade 1001Is 1 mm.
Preferably, the radius R of the large arc of the first tongue 3106Is 1.4mm, and the radius R of the major arc of the second falcon groove 320 is8Is 1.1 mm.
Preferably, the profile angle γ of the first falcon tooth 4101Is 119 deg., and the tooth form angle of the second falcon tooth 420 is gamma2Is 94 deg..
Preferably, the second lower plane 422 of the second falcon tooth 420 passes through the arc R5And is smoothly connected with the tooth end face 423.
Preferably the first tang 410 and the first tang 310 form a first cavity 313 arranged symmetrically and the second tang 420 and the second tang 320 form a second cavity 324, the second cavity 324 including a gap between the plane of the slot base 323 and the plane of the tooth end face 423.
It should be noted that, through first falcon tooth with first falcon groove, second falcon tooth with the second falcon groove all is equipped with the flank of tooth of the planar structure who matches for falcon tooth and falcon groove are through upper and lower two laminating planes close-fitting together, and simple structure, the laminating is firm, has improved the problem of the stress concentration that brings through a plurality of contact surface transmission power greatly.
It should be noted that through the first falcon tooth with the setting of the lower plane tooth terminal surface of second falcon tooth, the first orthodrome of first falcon groove with the setting of the second orthodrome of second falcon groove for the equal greatly increased in space of first cavity, the second cavity that forms between falcon tooth and the falcon groove has improved cooling air flow's cooling effect effectively, and the clearance between tank bottom plane and the tooth terminal surface plane link up with the second cavity mutually, makes cooling air flow circulate more unobstructed on the basis of increase cooling space, has improved cooling effect greatly, has effectively reduced tenon, tongue-and-groove connection site operating temperature.
It should be noted that, through the accurate setting of each parameter value, the problems of contact surface compressive stress, shear stress and stress concentration in the structure are greatly improved, and the working reliability of the disc tenon connecting part is ensured.
In another embodiment of the present invention, a fir-tree disc-tenon joint apparatus comprising a tenon 400 of a bucket 100 and a mortise 300 of a disk 200 which are coupled in a mating manner, the tenon 400 comprising:
The mortise 300 includes:
the first falcon groove 310 and the second falcon groove 320 which are arranged correspondingly to the tenon 400 and are symmetrically arranged in structure are formed by arc R with radius not less than 1.3mm7The first tongue groove 310 and the second tongue groove 320 are connected to each other, and have a first upper groove surface 311 and a second upper groove surface 321, which are respectively attached to the first tooth surface 411 and the second tooth surface 421, and the first upper groove surface 311 is attached to the radius R6A first large arc 312 of 1.4mm, the second upper groove surface 321 being tangentially connected to the radius R8A second arc 322 of 1.1mm is tangentially connected, and the second arc 322 of the second tongue 320 is tangentially connected to the plane of the groove bottom 323.
The fir-tree-shaped disc tenon connecting device is simple in structure and firm in fitting, and the problem of stress concentration caused by force transmission through a plurality of contact surfaces is greatly solved; the equal greatly increased in space has improved cooling air's cooling effect effectively, and the clearance between tank bottom plane and the tooth terminal surface plane link up with the second cavity mutually, makes the cooling air circulation more unobstructed on the basis of increase cooling space, has improved the cooling effect greatly, has effectively reduced tenon, tongue-and-groove connection position operating temperature.
Preferably, the profile angle γ of the first falcon tooth 4101Is 119 deg., and the tooth form angle gamma of the second falcon tooth 4202Is 94 deg..
Preferably, the second falcon teeth420 passes through the radius R5And the arc of 1mm is smoothly connected with the tooth end face 423.
Preferably, the first teeth 410 and the second teeth 420 have a pitch t of 5.8 mm.
Preferably, the first tenon tooth 410 is spaced from the tooth constriction 430 of the second tenon tooth 420 by a distance d of 3 mm.
Preferably the first tang 410 and the first tang 310 form a first cavity 313 arranged symmetrically and the second tang 420 and the second tang 320 form a second cavity 324, the second cavity 324 including a gap between the plane of the slot base 323 and the plane of the tooth end face 423.
It should be noted that, through first falcon tooth with first falcon groove, second falcon tooth with the second falcon groove all is equipped with the flank of tooth of the planar structure who matches for falcon tooth and falcon groove are through upper and lower two laminating planes close-fitting together, and simple structure, the laminating is firm, has improved the problem of the stress concentration that brings through a plurality of contact surface transmission power greatly.
It should be noted that, through first falcon tooth with the setting of the lower plane of second falcon tooth first falcon groove with the setting of second falcon groove orthodrome for the equal greatly increased in space of first cavity, the second cavity that forms between falcon tooth and the falcon groove has improved the cooling effect of cooling air flow effectively, and the clearance between tank bottom plane and the tooth terminal surface plane link up with the second cavity mutually, makes the cooling air flow circulate more unobstructed on the basis of increase cooling space, has improved the cooling effect greatly, has effectively reduced tenon, tongue and groove connection position operating temperature.
Through the setting of each parameter value, the problems of contact surface compressive stress, shearing stress and stress concentration in the structure are greatly improved, and the working reliability of the disc tenon connecting part is ensured.
The invention has the beneficial effects that:
the fir-type disc tenon connecting device is simple in structural form, greatly improves the problem of stress concentration of the connecting part of the blade tenon and the wheel disc mortise, enlarges a cooling air channel between the tenon and the mortise, greatly reduces the temperature of the connecting part, prolongs the creep life of the blade tenon and the wheel disc mortise structure, has good working reliability, and meets the high-quality requirement of an aeroengine on a turbine rotor.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (8)
1. The utility model provides a fir type dish tenon connecting device, includes tenon and the tongue-and-groove that the cooperation is connected, its characterized in that: the tenon includes:
the tenon and blade combined type engine blade assembly comprises a first tenon tooth and a second tenon tooth which are symmetrically arranged and connected through arc sections with the radius not less than 0.8mm, wherein the first tenon tooth and the second tenon tooth are respectively provided with a tooth surface and a lower plane which are of planar structures, the tooth widths of the tooth surface and the lower plane are respectively equal, the pressure angles of the tooth surfaces are the same, the tooth end surfaces of the second tenon tooth are planes, and arc smooth transition is formed among each connecting surface, the tenon head and the blade;
the tongue-and-groove includes:
with the tenon corresponds the setting, and by first tongue-and-groove and the second tongue-and-groove that the circular arc section that the radius is not less than 1.3mm links to each other, first tongue-and-groove with the second tongue-and-groove all be equipped with the plane slot surface that the flank of tooth laminated mutually, and respectively with the orthodrome of tangent connection of slot surface, the orthodrome of second tongue-and-groove is connected with the plane of tank bottom is tangent.
2. The firtree disk-and-tongue joint as set forth in claim 1, wherein: the first and second falcon teeth each have a face pressure angle of 490。
3. The firtree disk-and-tongue joint as set forth in claim 2, wherein: the tooth face tooth width of the first tenon tooth and the second tenon tooth is 2mm, the lower plane tooth width of the first tenon tooth and the second tenon tooth is 0.9mm, and the tooth face and the lower plane are both connected by circular arc rounding off.
4. The firtree disk-and-tongue joint as set forth in claim 3, wherein: first falcon tooth with blade round smooth connection's circular arc radius is 1 mm.
5. The firtree disk-and-tongue joint as set forth in claim 4, wherein: the great circular arc radius of first falcon groove is 1.4mm, the great circular arc radius of second falcon groove is 1.1 mm.
6. The firtree disk-and-tongue joint as set forth in claim 5, wherein: the first falcon tooth profile angle is 119 °, and the second falcon tooth profile angle is 94 °.
7. The firtree disk-and-tongue joint as set forth in claim 6, wherein: the lower plane of the second falcon tooth is connected with the tooth end surface through an arc in a smooth and smooth manner.
8. The firtree disk-and-tongue joint as set forth in claim 7, wherein: the first falcon teeth and the first falcon form a first cavity arranged symmetrically, the second falcon teeth and the second falcon form a second cavity, the second cavity including a gap between the slot bottom plane and the tooth end plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010158499.4A CN111255526A (en) | 2020-03-09 | 2020-03-09 | Fir-shaped disc tenon connecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010158499.4A CN111255526A (en) | 2020-03-09 | 2020-03-09 | Fir-shaped disc tenon connecting device |
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| Publication Number | Publication Date |
|---|---|
| CN111255526A true CN111255526A (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010158499.4A Pending CN111255526A (en) | 2020-03-09 | 2020-03-09 | Fir-shaped disc tenon connecting device |
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| CN (1) | CN111255526A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356930A (en) * | 2021-05-31 | 2021-09-07 | 北京南方斯奈克玛涡轮技术有限公司 | Turbine rotor device with reinforced cooling structure |
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| US4692976A (en) * | 1985-07-30 | 1987-09-15 | Westinghouse Electric Corp. | Method of making scalable side entry turbine blade roots |
| CN88103013A (en) * | 1987-05-22 | 1988-12-07 | 西屋电气公司 | Turbine blade attachment |
| US20030044284A1 (en) * | 2001-08-30 | 2003-03-06 | Leeke Leslie Eugene | Method and apparatus for non-parallel turbine dovetail-faces |
| US20090022591A1 (en) * | 2007-07-16 | 2009-01-22 | Amir Mujezinovic | Steam turbine and rotating blade |
| CN102102545A (en) * | 2011-03-22 | 2011-06-22 | 东方电气集团东方汽轮机有限公司 | Half-rotation speed nuclear power high-bearing-capacity fir-shaped blade root and sheave groove structure |
| US20130323049A1 (en) * | 2012-05-31 | 2013-12-05 | United Technologies Corporation | Stress-relieved wire seal assembly for gas turbine engines |
| JP2013249757A (en) * | 2012-05-31 | 2013-12-12 | Hitachi Ltd | Method for manufacturing turbine rotor blade and turbine rotor |
| EP3514327A1 (en) * | 2018-01-17 | 2019-07-24 | Rolls-Royce plc | Blade with asymmetrical root for a gas turbine engine |
-
2020
- 2020-03-09 CN CN202010158499.4A patent/CN111255526A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4692976A (en) * | 1985-07-30 | 1987-09-15 | Westinghouse Electric Corp. | Method of making scalable side entry turbine blade roots |
| CN88103013A (en) * | 1987-05-22 | 1988-12-07 | 西屋电气公司 | Turbine blade attachment |
| US20030044284A1 (en) * | 2001-08-30 | 2003-03-06 | Leeke Leslie Eugene | Method and apparatus for non-parallel turbine dovetail-faces |
| US20090022591A1 (en) * | 2007-07-16 | 2009-01-22 | Amir Mujezinovic | Steam turbine and rotating blade |
| CN102102545A (en) * | 2011-03-22 | 2011-06-22 | 东方电气集团东方汽轮机有限公司 | Half-rotation speed nuclear power high-bearing-capacity fir-shaped blade root and sheave groove structure |
| US20130323049A1 (en) * | 2012-05-31 | 2013-12-05 | United Technologies Corporation | Stress-relieved wire seal assembly for gas turbine engines |
| JP2013249757A (en) * | 2012-05-31 | 2013-12-12 | Hitachi Ltd | Method for manufacturing turbine rotor blade and turbine rotor |
| EP3514327A1 (en) * | 2018-01-17 | 2019-07-24 | Rolls-Royce plc | Blade with asymmetrical root for a gas turbine engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356930A (en) * | 2021-05-31 | 2021-09-07 | 北京南方斯奈克玛涡轮技术有限公司 | Turbine rotor device with reinforced cooling structure |
| CN113356930B (en) * | 2021-05-31 | 2022-05-20 | 北京南方斯奈克玛涡轮技术有限公司 | Turbine rotor device with reinforced cooling structure |
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