CN104912603A - Combined blade root - Google Patents
Combined blade root Download PDFInfo
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- CN104912603A CN104912603A CN201510159348.XA CN201510159348A CN104912603A CN 104912603 A CN104912603 A CN 104912603A CN 201510159348 A CN201510159348 A CN 201510159348A CN 104912603 A CN104912603 A CN 104912603A
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- movable block
- blade root
- fixed block
- blade
- combined type
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Abstract
The invention relates to the technical field of vibration damping of blades or cantilever type rotating structures and provides a combined blade root. The combined blade root comprises a fixed block and a movable block, wherein the top of the fixed block is used for being connected with a blade, the lower portion of the fixed block is provided with a first installation part and an insertion groove formed in the first installation part, a second installation part is arranged on the lower portion of the movable block, the movable block is movably inserted in the insertion groove, a gap is reserved between the movable block and the inner wall of the insertion groove, and both the first installation part and the second installation part are used for being connected with a wheel disc. When vibration is transmitted to a blade root body and the fixed block through the blade, vibration energy is absorbed through friction between the movable block and the fixed block due to the fact that the gap exists between the fixed block and the movable block, resonance between the movable block and the fixed block is avoided, and excessive vibration amplitude of the blade is avoided.
Description
Technical field
The present invention relates to the antivibration area of blade or cantilever type rotational structure, a kind of combined type blade root is provided especially.
Background technique
The damage accident of rotating machinery blade (crackle, fracture), the overwhelming majority causes due to vibration.Rotor blade receives powerful centrifugal force load, adds the alternate load that Airflow Exciting-Vibration Force causes, and after work certain hour, easily causes vibrating fatigue, produces fatigue crack.
Vibration frequency is the important parameter of blade design, usually requires that the integral multiple of Natural Frequency of Blade and working speed has and certain avoids rate, avoid resonance.Relative integers choosing doubly is relevant with the factor such as irregular, the air cylinder structure form of the number of blade adjacent structure, air inlet runner.
In order to ensure Security, according to calculating and the measurement of frequency, estimate and judge the situation of vibration.But affect by the factor such as fit up gap, material behavior dispersiveness, machining error of leaf temperature field, blade root and wheel disc, theory calculate is difficult to the actual frequency calculating blade accurately.And to be tested processes monitoring blade frequencies of doing experiment, once find that blade can not meet frequency and avoid rate demand, in order to not affect aeroperformance, substantially can not adjust vane thickness, revising movable vane forward and backward level stator blade number simultaneously and also not too realizing.Best feasible method is the frequency changing blade self, namely needs to design the whole blade of a kind of frequency-adjustable, can conveniently tune to open the blade natural frequency of vibration, avoids resonance when making it run.
Integral shroud linear leaf is usually through arranging vibration damping boss, and utilize shroud (integral shroud), lacing wire etc. to increase damping, change shroud and lacing wire size are adjusted frequency.But for not shrouded blade, except changing vane thickness and blade integral material, available adjustment vibration frequency means are few.And change material and also need whole blade again manufacturing.
Summary of the invention
(1) technical problem that will solve
The object of this invention is to provide a kind of combined type blade root and blade, under the prerequisite not affecting aeroperformance, realize the adjustment of himself frequency and vibration damping fast.
(2) technological scheme
For achieving the above object, the invention provides a kind of combined type blade root, it is characterized in that, comprising:
Fixed block, the top of described fixed block is used for being connected with blade, and bottom is provided with the first assembly department and is opened in the slot on described first assembly department; With
Movable block, the bottom of described movable block is provided with the second assembly department, and described movable block activity is inserted in described slot, and and leave gap between the inwall of described slot;
Described first assembly department and the second assembly department are all for being connected with wheel disc.
Preferably, the inwall of described slot offers draw-in groove; The outer wall of described movable block is provided with inserted part, described inserted part and described draw-in groove snap-fit engagement.
Preferably, the outer wall of described second assembly department is provided with the moat face of inner concavity, fills out and be provided with damping material in described moat face.
Preferably, described damping material is damping glue.
Preferably, described slot and movable block are all from top to bottom in gradually closing formula structure.
Preferably, described slot and movable block are swallow-tail form.
Preferably, described fixed block and/or described movable block offer packing groove vertically, in described packing groove, is filled with damping material.
Preferably, the material of described movable block is different from the material of described fixed block.
Preferably, the outer wall of described second assembly department is provided with wearing layer.
Preferably, described wearing layer is shot-peening layer.
(3) beneficial effect
The invention provides a kind of combined type blade root, comprise fixed block and movable block, the top of fixed block is for connecting blade, bottom is used for being connected with wheel disc, the bottom of fixed block is also provided with slot, and movable block activity is inserted in this slot, and has gap between movable block and slot.When blade by vibration passing to blade root body and fixed block time, owing to there is gap between fixed block and movable block, thus by the friction between movable block and fixed block absorbing vibrational energy, there is not resonance between movable block and fixed block, thus avoid blade and produce excessive amplitude.Invention increases the flexibility that blade design manufactures.Without the need to redesigning blade profile or changing contiguous structure form, the adjustment of the blade natural frequency of vibration is realized quickly and easily by adjustment movable block material, movable block and the fit form of fixed block, the damping glue thickness of movable block, reduce the difficulty of blade design, improve the Security of blade vibration.
Accompanying drawing explanation
Fig. 1 is the blade of the embodiment of the present invention one and the schematic diagram of fixed block;
Fig. 2 is the schematic diagram of the movable block of the embodiment of the present invention one;
Fig. 3 is a kind of combined type blade root of the embodiment of the present invention one and the schematic diagram of blade;
Fig. 4 is the blade of the embodiment of the present invention two and the schematic diagram of fixed block;
Fig. 5 is the schematic diagram of the movable block of the embodiment of the present invention two;
Fig. 6 is a kind of combined type blade root of the embodiment of the present invention two and the schematic diagram of blade;
Fig. 7 is the blade of the embodiment of the present invention three and the schematic diagram of fixed block;
Fig. 8 is the schematic diagram of the movable block of the embodiment of the present invention three;
Fig. 9 is a kind of combined type blade root of the embodiment of the present invention three and the schematic diagram of blade.
Reference character:
1, blade; 2, slot; 3, movable block; 4, fixed block; 21, the first working surface; 22, the second working surface; 23, inserted part; 24, draw-in groove; 25, damping material.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
In describing the invention, except as otherwise noted, term " on ", D score, " top ", " bottom ", the orientation of the instruction such as " longitudinal direction " or state relation be based on orientation shown in the drawings or state relation, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be directly be connected, also indirectly can be connected by intermediary.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Embodiment one
Shown in composition graphs 1 to Fig. 3, a kind of combined type blade root that the embodiment of the present invention one provides, comprises fixed block 4 and movable block 3, and the top of fixed block 4 is used for fixing blade; The bottom of described fixed block 4 has the first assembly department to two radial side projections and the slot 2 that is opened on described first assembly department, and described first assembly department is used for the first working surface 21 by its two radial side and wheel disc clamping; The activity of described movable block 3 is inserted in described slot 2, and movable block 3 can be the multiple of dual extension-compression modulus, selects the movable block 3 of suitable Young's modulus according to frequency reducing or raising frequency demand; Between the axial both sides of described fixed block 4 and the inwall of slot 2, there is gap, the bottom of described movable block 3 has the second assembly department to two radial side projections, described second assembly department is used for the second working surface 22 and described wheel disc clamping by its two radial side, wherein, the second working surface 22 is concordant with the normal direction of the first working surface 21.
When blade 1 by vibration passing to fixed block 4 time, because movable block 3 and fixed block 4 are not integral structure, and between fixed block 4 and movable block 3, there is gap, thus by friction between movable block 3 and fixed block 4 absorbing vibrational energy, movable block 3 is not vibrated with fixed block 4 same frequency, namely there is not resonance between movable block 3 and fixed block 4, thus avoid blade 1 and produce excessive amplitude.
Can realize diametrically spacing between movable block 3 and fixed block 4 by means of only the connection with wheel disc, but preferably all offer draw-in groove 24 on the top of slot 2, the inserted part 23 of evagination is all set in the axial both sides of described movable block 3, described inserted part 23 and described draw-in groove 24 snap-fit engagement, thus realize movable block 3 and fixed block 4 relative limit in the vertical.Thus, when mounted, first movable block 3 can be installed in slot 2, then be connected with wheel disc again, therefore facilitate installation.
By testing or calculate the frequency determining the not combined blade 1 identical with blade material, and record this value; According to the size of vibrating source frequency, the movable block 3 of processing different materials (Young's modulus or density difference) coordinates with fixed block 4.The system of selection of movable block 3 material: in order to improve the frequency of blade 1, can make movable block 3 select the material that Young's modulus is comparatively large or density is less; Otherwise, in order to reduce the frequency of blade 1, movable block 3 can be made to select the material that Young's modulus is less or density is larger.
Wherein, the material of described movable block 3 is different from the material of described fixed block 4, and namely the movable block 3 and fixed block 4 of unlike material itself have different vibration frequency characteristics, can promote with this effect absorbing vibration frequency.
Wherein, movable block 3 because of vibration can the axial changing of the relative positions, thus and produce between wheel disc and rub more frequently, therefore wearing layer can be set at the second working surface 22, to reduce wearing and tearing, the shot-peening layer that described wearing layer is formed preferably by shot blast; Certainly, the first working surface 21 of fixed block 4 also can arrange wearing layer.
Embodiment two
Shown in composition graphs 4 to Fig. 6, a kind of combined type blade root that the present embodiment two provides, substantially identical with the structure of embodiment one, something in common repeats no more, and difference is:
Described second working surface 22 is provided with the moat face compared with the first working surface 21 indent, fill out in described moat face and be provided with damping material 25, this damping material 25 can be damping glue, and this damping material 25 also can absorbing vibrational energy to a certain extent, realizes the adjustment of vibration frequency further.
Embodiment three
Shown in composition graphs 7 to Fig. 9, a kind of combined type blade root that the present embodiment three provides, substantially identical with the structure of embodiment two, something in common repeats no more, and difference is:
The axial both sides of the both sides that slot 2 is relative and described movable block 3 are from top to bottom all in gradually closing formula structure, namely the both sides that fixed block 4 is relative and the axial both sides of described movable block 3 are all in inverted dovetail shaped, movable block 3 by its axial both sides top-down gradually closing formula structure installment in the overall slot 2 formed in inverted trapezoidal structure equally from top to bottom, by changing the movable block 3 with the second assembly department of different relative position height, regulate the height of movable block 3 in slot 2, and then realize the adjustment in gap between the both sides of movable block 3 and fixed block 4, realize the adjustment of vibration frequency thus.
In addition, also on described fixed block 4 and/or movable block 3, packing groove can be offered vertically, in described packing groove, be filled with damping material, play the effect regulating vibration frequency further.
Combination blade root constructional of the present invention, by the design that movable block 3 coordinates with fixed block 4, damping, contact stiffness and mass distribution can be adjusted easily, friction Absorbable rod vibrational energy simultaneously between movable block 3, blade 1 frequency modulation can be realized fast, add the vibration safety of blade 1, reduce design risk, do not need repeatedly to design blade 1 profile and thickness, improve design efficiency.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and replacement, these improve and replace and also should be considered as protection scope of the present invention.
Claims (10)
1. a combined type blade root, is characterized in that, comprising:
Fixed block (2), the top of described fixed block (2) is used for being connected with blade (1), and bottom is provided with the first assembly department and is opened in the slot (2) on described first assembly department; With
Movable block (4), the bottom of described movable block (4) is provided with the second assembly department, and described movable block (4) activity is inserted in described slot (2), and and leave gap between the inwall of described slot (2);
Described first assembly department and the second assembly department are all for being connected with wheel disc.
2. combined type blade root according to claim 1, is characterized in that, the inwall of described slot (2) offers draw-in groove (24); The outer wall of described movable block (3) is provided with inserted part (23), described inserted part (23) and described draw-in groove (24) snap-fit engagement.
3. combined type blade root according to claim 2, is characterized in that, the outer wall of described second assembly department is provided with the moat face of inner concavity, fills out and be provided with damping material (25) in described moat face.
4. combined type blade root according to claim 3, is characterized in that, described damping material (25) is damping glue.
5. combined type blade root according to claim 1, is characterized in that, described slot (2) and movable block (4) are all from top to bottom all in gradually closing formula structure.
6. combined type blade root according to claim 5, is characterized in that, described slot (2) and movable block (4) are swallowtail-shaped structure.
7. combined type blade root according to claim 5, is characterized in that, described fixed block (4) and/or described movable block (3) offers packing groove vertically, is filled with damping material in described packing groove.
8. the combined type blade root according to any one of claim 1 to 7, is characterized in that, the material of described movable block (3) is different from the material of described fixed block (4).
9. the combined type blade root according to any one of claim 1 to 7, is characterized in that, the outer wall of described second assembly department is provided with wearing layer.
10. combined type blade root according to claim 9, is characterized in that, described wearing layer is shot-peening layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510159348.XA CN104912603A (en) | 2015-04-03 | 2015-04-03 | Combined blade root |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510159348.XA CN104912603A (en) | 2015-04-03 | 2015-04-03 | Combined blade root |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104912603A true CN104912603A (en) | 2015-09-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510159348.XA Pending CN104912603A (en) | 2015-04-03 | 2015-04-03 | Combined blade root |
Country Status (1)
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| CN (1) | CN104912603A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060326A (en) * | 2018-07-19 | 2018-12-21 | 北京航空航天大学 | A kind of turbine blade root position simulation test piece and design method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4482297A (en) * | 1981-11-16 | 1984-11-13 | Terry Corporation | Bladed rotor assembly |
| JPS59226202A (en) * | 1983-06-06 | 1984-12-19 | Toshiba Corp | Moving blade of turbine |
| JP2000220405A (en) * | 1999-01-28 | 2000-08-08 | Hitachi Ltd | Turbine rotor blade |
| CN2469184Y (en) * | 2001-04-04 | 2002-01-02 | 东方汽轮机厂 | Blade self-capping damp piece structure of steam turbine |
| CN2737980Y (en) * | 2004-09-30 | 2005-11-02 | 中航（保定）惠腾风电设备有限公司 | Structural damper for wind wheel blades |
| US20090290983A1 (en) * | 2008-05-26 | 2009-11-26 | Kabushiki Kaisha Toshiba | Turbine blade assembly and steam turbine |
| CN204716303U (en) * | 2015-04-03 | 2015-10-21 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | Combined type blade root |
-
2015
- 2015-04-03 CN CN201510159348.XA patent/CN104912603A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4482297A (en) * | 1981-11-16 | 1984-11-13 | Terry Corporation | Bladed rotor assembly |
| JPS59226202A (en) * | 1983-06-06 | 1984-12-19 | Toshiba Corp | Moving blade of turbine |
| JP2000220405A (en) * | 1999-01-28 | 2000-08-08 | Hitachi Ltd | Turbine rotor blade |
| CN2469184Y (en) * | 2001-04-04 | 2002-01-02 | 东方汽轮机厂 | Blade self-capping damp piece structure of steam turbine |
| CN2737980Y (en) * | 2004-09-30 | 2005-11-02 | 中航（保定）惠腾风电设备有限公司 | Structural damper for wind wheel blades |
| US20090290983A1 (en) * | 2008-05-26 | 2009-11-26 | Kabushiki Kaisha Toshiba | Turbine blade assembly and steam turbine |
| CN204716303U (en) * | 2015-04-03 | 2015-10-21 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | Combined type blade root |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060326A (en) * | 2018-07-19 | 2018-12-21 | 北京航空航天大学 | A kind of turbine blade root position simulation test piece and design method |
| CN109060326B (en) * | 2018-07-19 | 2019-09-24 | 北京航空航天大学 | A kind of turbine blade root position simulation test piece and design method |
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| PB01 | Publication | ||
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Application publication date: 20150916 |