CN102588003B - Low-stress double-arc surface straight tenon connecting structure - Google Patents
Low-stress double-arc surface straight tenon connecting structure Download PDFInfo
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- CN102588003B CN102588003B CN201210069458.3A CN201210069458A CN102588003B CN 102588003 B CN102588003 B CN 102588003B CN 201210069458 A CN201210069458 A CN 201210069458A CN 102588003 B CN102588003 B CN 102588003B
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Abstract
The invention provides a low-stress double-arc surface straight tenon connecting structure, which belongs to the technical field of general design methods for connection of mechanical structures. The double-arc surface straight tenon connecting structure comprises a blade tenon and a wheel disc mortise, the inner wall of the wheel disc mortise is in the shape of an inwards concave arc as compared with a wheel disc mortise with a traditional structure, the radian of the inwards concave arc ranges from pi/72 to pi/2, two side walls of the blade tenon are outwards protruded to be in the shape of arcs, the radian of the protruded arcs ranges from pi/72 to pi/2, and simultaneously, the ratio of the arc radius R1 of the tenon to the arc radius R2 of the mortise ranges from 0.5 to 0.99. The low-stress double-arc surface straight tenon connecting structure improves a contact stress distribution mode, eliminates peak stress of the edge of a traditional plane/plane contact region, improves structure strength, and increases ability of structural resistance to micro-motion fatigue failure.
Description
Technical field
The present invention is directed to machinery impeller vane, wheel disc linkage structure, belong to the general design method technical field that mechanical structure connects, particularly a kind of low stress double-arc surface straight tenon connecting structure.
Background technique
At present, in the machinery impeller vane/wheel disc linkage structure comprising aeroengine, internal-combustion engine etc., the application that tenon links structure is comparatively extensive, and its effect is used to connect working blade and wheel disc.Although along with the progress of engineering, there is the Blisk formed by welding, but due to many-sided reason such as cost, technology maturity, making tenon link structure will as the main Connecting format between turbomachine Leaf/wheel disc within a very long time.
Early stage blade/wheel disc adopts pin type to connect, and bears shearing load and power transmission by pin, and working blade relies on lug to be connected by the annular groove of pin with wheel rim.This connection has damping and eliminates the effect of joint additional stress, but its bearing capacity is limited, size and weight large, thus day by day improve along with to the requirement of turbomachine operating conditions, this Placement is eliminated gradually, and its reason is that bolt hole limit has significant stress to concentrate, along with the increase of load, the plastic zone that limit, hole will occur compared with large regions, makes structural strength and life-span significantly reduce.Tenon links structure then makes working blade be arranged in the corresponding tongue-and-groove in wheel rim place by tenon, is positioned and power transmission by the surface of contact of tongue-and-groove side.Therebetween usually adopt Spielpassung, blades installation is convenient, avoids simultaneously and occur erection stress in tongue-and-groove.Comparatively speaking, its contact loaded area is comparatively large, and stress level is lower and distribution is comparatively even, is the main Placement between current turbomachine Leaf/wheel disc.Usually adopt dove-tail form tenon to link structure for fan/compressor, then usually adopt fir-tree type tenon to link structure for turbine.General its surface of contact of tenon link structure is plane along the axial direction of turbomachine running shaft, and be called straight tenon, namely the present invention is that a kind of novel straight tenon connects; In addition, link in structure at the fan tenon of the high thrust weight ratio aeroengine of some advanced persons, there is circular arc tenon (such as CFM56-7 h type engine h), namely blade tenon and wheel disc chase mortise are circular arc along the axial direction of turbomachine running shaft, can ensure like this under the condition that lobe numbers is identical, increase hub ratio, the aeroperformance of fan is improved.
The load that the blade of turbomachine bears is comparatively complicated, the vibration generally including blade centrifugal force, blade aerodynamic load and caused by gas shock, also will bear higher heat load for turbine blade and wheel disc.Therefore, tenon links structure under the direct or indirect effect of these load, will produce larger contact stress between surface of contact, under the effect of cyclic loading, causes tenon to link structure generation fatigue failure.Fretting fatigue is that tenon links a kind of main failure mode of structure, is also the focus that tenon connects structure engineering design and optimization.
Large quantity research shows, the tenon of traditional employing plane contact links the significant stress of structure contact area marginal existence and concentrates, and this high gradient contact stress is the major reason causing tenon to link the inefficacy of structure generation fretting fatigue.Be optimized by connecting structural key geometric parameter (such as wrapping angle, contact area edge radius, bearing length etc.) to tenon, the peak stress at edge, contact area can be made to lower, improve structural strength and life-span.If but adopt the way of contact of straight line/straight line (under two-dimensional condition), just cannot eliminate the high gradient stress at edge, contact area.
Summary of the invention
For problems of the prior art, the present invention proposes a kind of low stress double-arc surface straight tenon connecting structure, object is the situation improving traditional tenon link structure contact area marginal existence high gradient stress, and then strengthen the ability of the tenon link anti-fretting wear of structure and fatigue, and provide a kind of by the straight tenon connecting structure of arc surface/arc surface as surface of contact thus.
The straight tenon connecting structure of double-arc surface described in the present invention develops on the basis of conventional planar contact straight tenon connecting structure, and this structure comprises blade tenon and wheel disc chase mortise two parts, and the innovation of invention is in the surface of contact design in blade and tongue-and-groove.The side contacts of blade tenon is arc-shaped towards outer lug, and wheel disc chase mortise surface of contact indent is arc-shaped, if using the plane perpendicular to turbomachine axis as tangent plane, the Line of contact of formation is rendered as the form of circular arc/circular arc inscribe contact.This makes the distribution of contact form of work loads lower blade/wheel disc there occurs larger change.
A kind of low stress double-arc surface straight tenon connecting structure that the present invention proposes, comprises blade tenon and wheel disc chase mortise two parts, and tenon radius of arc R1 is 0.5 ~ 0.99 with the ratio range of tongue-and-groove radius of arc R2 simultaneously.
Described blade tenon is lineal shape tenon, blade tenon is rectilinear shape along horizontal plane direction, this blade tenon is divided into upper and lower tenon two-part along vertical section direction, the both sides sidewall of top tenon is parallel side wall vertically, the both sides sidewall of bottom tenon is circular arc sidewall evenly protruding laterally, is formed as a kind of space curved surface of twocouese circular arc;
Described wheel disc chase mortise is also rectilinear form along horizontal plane direction, tongue-and-groove is divided into upper and lower tongue-and-groove two-part, top tongue-and-groove is the horizontal wall surface structure that both sides inwall upwards opens, bottom tongue-and-groove is that both sides inwall opens downwards, and the formation circular arc interior wall construction that concaves, connection between blade tenon and wheel disc chase mortise is Spielpassung, and the contact between the circular arc inwall that the circular arc side wall surface of the both sides projection of bottom tenon and tongue-and-groove both sides, bottom concave is that arc surface/arc surface contacts.
The invention has the advantages that:
(1) a kind of double-arc surface straight tenon connecting structure of the present invention, improves the distribution form of contact stress, eliminates the peak stress of conventional planar/plane contact area edge, improves structural strength.
(2) peak stress of conventional planar/plane contact area edge is the major reason causing tenon to link the inefficacy of structure generation fretting fatigue, because the double-arc surface straight tenon connecting structure in the present invention makes distribution of contact form change, and then improve the ability of structure opposing fretting fatigue inefficacy.
Accompanying drawing explanation
Fig. 1 is several typical contact form and stress distribution characteristic curve diagram thereof;
Fig. 2 is the overall structure schematic diagram of the double-arc surface straight tenon connecting structure that the present invention proposes;
Fig. 3 is the cross section structure schematic diagram of the double-arc surface straight tenon connecting structure that the present invention proposes;
Fig. 4 is double-arc surface straight tenon connecting structure blade tenon structural representation of the present invention;
Fig. 5 is double-arc surface straight tenon connecting structure blade tenon partial enlargement structural representation of the present invention;
Fig. 6 is double-arc surface straight tenon connecting structure wheel disc chase mortise structural representation of the present invention;
Fig. 7 is double-arc surface straight tenon connecting structure wheel disc chase mortise partial enlargement structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The present invention proposes a kind of low stress double-arc surface straight tenon connecting structure, comprise blade tenon and wheel disc chase mortise two parts, wherein wheel disc chase mortise is compared difference relative to the wheel disc chase mortise of same conventional construction and is that the inwall of wheel disc chase mortise is the circular shape concaved, the radian of this interior concave circular arc is π/72 ~ pi/2, blade tenon two side is outwardly convex is arc-shaped, the radian of this protruding circular arc is π/72 ~ pi/2, and tenon radius of arc R1 is 0.5 ~ 0.99 with the ratio range of tongue-and-groove radius of arc R2 simultaneously.
Contact between arc surface/arc surface is very close with typical Hertz contact, and its pressure diagram form produced, close to oval, does not exist larger peak stress.Therefore, the arc contact body of inscribe is applied to tenon and links in the middle of structure, just effectively can reduce the peak stress of contact area, improve intensity and fatigue behaviour that tenon links structure.Several typical contact form as shown in Figure 1 and stress distribution feature thereof, can find out: traditional straight line/straight contact result in higher peak stress; Circular arc/straight contact is Hertz contact, and the distribution form of its contact stress is oval; Arc surface inscribe or circumscribed time stress distribution then close to oval, in more above-mentioned several situation, under the contact condition of arc surface inscribe, contact peak stress is minimum.
As shown in Figures 2 and 3, described blade tenon is lineal shape tenon, namely blade tenon is rectilinear shape along horizontal plane direction, this blade tenon is convex structure along vertical section direction, be divided into upper and lower tenon two-part, the both sides sidewall of top tenon is parallel side wall vertically, as shown in Figure 4 and Figure 5, the both sides sidewall of bottom tenon is circular arc sidewall evenly protruding laterally, the radian of this circular arc sidewall is π/72 ~ pi/2 (i.e. chord length h1 with the ratio between radius R 1 between 0.087 ~ 1.414), be formed as a kind of space curved surface of twocouese circular arc, and the connection between the both sides sidewall of bottom tenon and tenon base, bottom is lead angle structure, lead angle angle is 35 ° ~ 75 ° (wrapping angles when this angle is also tenon/tongue-and-groove work), connection between the both sides sidewall of top tenon and the both sides sidewall of bottom tenon is also for lead angle connects, lead angle angle is 125 ° ~ 165 °, the aspect ratio of top tenon and bottom tenon is 0.4 ~ 1.0, the width of top tenon top margin and the ratio range of bottom tenon base width are 0.5 ~ 0.9, the ratio range of the width on top and the bottom tenon whole height and tenon base, bottom is 1.0 ~ 3.0.
As shown in Figure 6 and Figure 7, described wheel disc chase mortise is also rectilinear form along horizontal plane direction, tongue-and-groove is divided into upper and lower tongue-and-groove two-part, top tongue-and-groove is both sides inwall upwards (to tongue-and-groove opening direction) horizontal wall surface structure of slightly opening, the angle of both sides internal face and vertical direction is 5 ° ~ 10 °, bottom tongue-and-groove is that both sides inwall downward (to tongue-and-groove bottom land direction) opens, and the circular arc interior wall construction concaved, radian be π/72 ~ pi/2 (namely chord length h2 with the ratio between radius R 2 between 0.044 ~ 1.414, its radius of arc R2 should slightly larger than tenon arc surface radius R 1 simultaneously, the scope of R1/R2 is 0.5 ~ 0.99), the angle of both sides inwall and vertical direction is 15 ° ~ 55 ° (wrapping angle when the same tenon/tongue-and-groove of this angle works forms remaining relation mutually).Attachment portion between the both sides inwall of top tongue-and-groove and the both sides inwall of bottom tongue-and-groove is that lead angle connects, lead angle angle is 115 ° ~ 160 °, attachment portion between the both sides inwall of bottom tongue-and-groove and the bottom land of bottom tongue-and-groove is that lead angle is connected, and lead angle angle is 35 ° ~ 75 °.Connection between blade tenon and wheel disc chase mortise is Spielpassung, contact between the circular arc inwall that the circular arc side wall surface of the both sides projection of bottom tenon and tongue-and-groove both sides, bottom concave is that arc surface/arc surface contacts, and this makes the distribution of contact form of work loads lower blade/wheel disc there occurs larger change.The degree of depth of top tongue-and-groove is more than or equal to the height of top tenon, and the degree of depth of bottom tongue-and-groove is greater than the height of bottom tenon.
A kind of low stress double-arc surface straight tenon connecting structure that the present invention proposes, its surface of contact indent becomes the contact surface of circular arc, and the effect of tongue-and-groove is encased by blade tenon, it is connected with wheel disc, drives blade rotary during work by wheel disc, do work to gas.This structure can be applicable in the middle of the connection of the blade/wheel disc of all size thrust/power turbomachine fan/compressor.
As can be seen from the above-mentioned description of this invention, technological scheme of the present invention can alleviate the shortcoming that traditional tenon links high, the anti-fretting fatigue poor performance of structure contact area edge peaks stress, can improve intensity and the life-span of structure.
Claims (4)
1. a low stress double-arc surface straight tenon connecting structure, is characterized in that: comprise blade tenon and wheel disc chase mortise two parts;
Described blade tenon is lineal shape tenon, blade tenon is rectilinear shape along horizontal plane direction, this blade tenon is divided into upper and lower tenon two-part along vertical section direction, connection between the both sides sidewall of described bottom tenon and tenon base, bottom is lead angle structure, and lead angle angle is 35 ° ~ 75 °; Connection between the both sides sidewall of top tenon and the both sides sidewall of bottom tenon is also for lead angle connects, and lead angle angle is 125 ° ~ 165 °; The both sides sidewall of top tenon is parallel side wall vertically, and the both sides sidewall of bottom tenon is circular arc sidewall evenly protruding laterally, and the radian of circular arc sidewall is π/72 ~ pi/2; Be formed as a kind of space curved surface of twocouese circular arc;
Described wheel disc chase mortise is also rectilinear form along horizontal plane direction, tongue-and-groove is divided into upper and lower tongue-and-groove two-part, attachment portion between the both sides inwall of top tongue-and-groove and the both sides inwall of bottom tongue-and-groove is that lead angle connects, lead angle angle is 115 ° ~ 160 °, attachment portion between the both sides inwall of bottom tongue-and-groove and the bottom land of bottom tongue-and-groove is that lead angle is connected, and lead angle angle is 35 ° ~ 75 °; Top tongue-and-groove is the horizontal wall surface structure that both sides inwall upwards opens, bottom tongue-and-groove is that both sides inwall opens downwards, and the formation circular arc interior wall construction that concaves, the radian of circular arc inwall is π/72 ~ pi/2, connection between blade tenon and wheel disc chase mortise is Spielpassung, and the contact between the circular arc inwall that the circular arc side wall surface of the both sides projection of bottom tenon and tongue-and-groove both sides, bottom concave is that arc surface/arc surface contacts; The ratio of the radian of the circular arc sidewall radian of described bottom tenon and the circular arc inwall of bottom tongue-and-groove is 0.5 ~ 0.99.
2. a kind of low stress double-arc surface straight tenon connecting structure according to claim 1, is characterized in that: described top tenon and the aspect ratio of bottom tenon are 0.4 ~ 1.0; The width of top tenon top margin and the ratio range of bottom tenon base width are 0.5 ~ 0.9, and the ratio range of the width on top and the bottom tenon whole height and tenon base, bottom is 1.0 ~ 3.0.
3. a kind of low stress double-arc surface straight tenon connecting structure according to claim 1, it is characterized in that: the both sides internal face of described top tongue-and-groove and the angle of vertical direction are 5 ° ~ 10 °, the angle of the both sides internal face of described bottom tongue-and-groove and the angle of vertical direction is 15 ° ~ 55 °.
4. a kind of low stress double-arc surface straight tenon connecting structure according to claim 1, is characterized in that: the degree of depth of described top tongue-and-groove is more than or equal to the height of top tenon, and the degree of depth of bottom tongue-and-groove is greater than the height of bottom tenon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210069458.3A CN102588003B (en) | 2012-03-15 | 2012-03-15 | Low-stress double-arc surface straight tenon connecting structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210069458.3A CN102588003B (en) | 2012-03-15 | 2012-03-15 | Low-stress double-arc surface straight tenon connecting structure |
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| Publication Number | Publication Date |
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| CN102588003A CN102588003A (en) | 2012-07-18 |
| CN102588003B true CN102588003B (en) | 2014-12-24 |
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| CN201210069458.3A Expired - Fee Related CN102588003B (en) | 2012-03-15 | 2012-03-15 | Low-stress double-arc surface straight tenon connecting structure |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111365079A (en) * | 2020-04-01 | 2020-07-03 | 南京航空航天大学 | Ceramic matrix composite turbine rotor blade disk tenon connecting structure and turbine disk |
| CN115270359B (en) * | 2022-09-28 | 2023-01-17 | 中国航发四川燃气涡轮研究院 | Design method of low-contact-stress tenon connection structure under size constraint |
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|---|---|---|---|---|
| US4169694A (en) * | 1977-07-20 | 1979-10-02 | Electric Power Research Institute, Inc. | Ceramic rotor blade having root with double curvature |
| US4323394A (en) * | 1979-08-06 | 1982-04-06 | Motoren-Und Turbinen-Union Munchen Gmbh | Method for manufacturing turborotors such as gas turbine rotor wheels, and wheel produced thereby |
| CN1036813A (en) * | 1988-04-06 | 1989-11-01 | 西屋电气公司 | Unitary side is debug the assistant warden vane group |
| DE69509015T2 (en) * | 1994-08-03 | 1999-10-07 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation (S.N.E.C.M.A.), Paris | Compressor robot disc with asymmetrical circumferential groove |
| CA2077051C (en) * | 1991-08-28 | 2000-11-14 | Jacques Marie Pierre Stenneler | Gas turbine engine rotor blades with improved angular positioning |
| FR2921408A1 (en) * | 2007-09-26 | 2009-03-27 | Snecma Sa | Annular sealing and vibration dampening ring for turbomachine rotor in e.g. automobile field, has square, rectangular or circular shaped section, where ring is made of super-elastic metal material such as shape memory alloy material |
| WO2011086055A3 (en) * | 2010-01-12 | 2012-01-26 | Snecma | Blade disc having a circular groove for receiving blade bases |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH317252A (en) * | 1952-09-06 | 1956-11-15 | Maschf Augsburg Nuernberg Ag | Impeller for centrifugal machines with axial flow |
-
2012
- 2012-03-15 CN CN201210069458.3A patent/CN102588003B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4169694A (en) * | 1977-07-20 | 1979-10-02 | Electric Power Research Institute, Inc. | Ceramic rotor blade having root with double curvature |
| US4323394A (en) * | 1979-08-06 | 1982-04-06 | Motoren-Und Turbinen-Union Munchen Gmbh | Method for manufacturing turborotors such as gas turbine rotor wheels, and wheel produced thereby |
| CN1036813A (en) * | 1988-04-06 | 1989-11-01 | 西屋电气公司 | Unitary side is debug the assistant warden vane group |
| CA2077051C (en) * | 1991-08-28 | 2000-11-14 | Jacques Marie Pierre Stenneler | Gas turbine engine rotor blades with improved angular positioning |
| DE69509015T2 (en) * | 1994-08-03 | 1999-10-07 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation (S.N.E.C.M.A.), Paris | Compressor robot disc with asymmetrical circumferential groove |
| FR2921408A1 (en) * | 2007-09-26 | 2009-03-27 | Snecma Sa | Annular sealing and vibration dampening ring for turbomachine rotor in e.g. automobile field, has square, rectangular or circular shaped section, where ring is made of super-elastic metal material such as shape memory alloy material |
| WO2011086055A3 (en) * | 2010-01-12 | 2012-01-26 | Snecma | Blade disc having a circular groove for receiving blade bases |
Non-Patent Citations (1)
| Title |
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| 榫连结构几何参数对接触应力的影响;魏大盛等;《推进技术》;20100831;第31卷(第4期);参见第474页第2段、图1-4，第475页图5 * |
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| CN102588003A (en) | 2012-07-18 |
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