CN104018888A - Wrapping fir type blade root for circumferentially installing blades - Google Patents
Wrapping fir type blade root for circumferentially installing blades Download PDFInfo
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- CN104018888A CN104018888A CN201410281867.9A CN201410281867A CN104018888A CN 104018888 A CN104018888 A CN 104018888A CN 201410281867 A CN201410281867 A CN 201410281867A CN 104018888 A CN104018888 A CN 104018888A
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- blade root
- wrapping
- blade
- root
- fir type
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Abstract
The invention relates to a wrapping fir type blade root for circumferentially installing blades. A tooth-shaped surface is formed in the fir type blade root and a connecting end of a wheel edge; a blade root wrapping convex shoulder is formed in the upper end surface of the connecting end; a gap filling bar is arranged at the contact area between the bottom surface of the connecting end and the wheel edge; the fir type blade root is in contact with the wheel edge through the tooth-shaped surface; and the blade root wrapping convex shoulder is in contact connection with a convex shoulder of the wheel edge. According to the wrapping fir type blade root, a wrapping structure is integrated into the design of the fir type blade root, so that the outwards stretched axial displacement of the wheel edge is limited, the contact area between the blade and the wheel edge is enlarged, the stress level between the blade root and the wheel edge is greatly reduced and the safety and reliability of a steamship are improved; by virtue of the wrapping structure, the stress of the wheel edge can be better lowered than the stress of the blade root, the material strength performances of the blades and a blade wheel can be sufficiently exerted and the design requirement of the strength of the blade root can be easily met; and besides, by virtue of the structure form of the wrapping fir type blade root, the firmness degree of the connection between the blades and the blade wheel can be improved, so that the dynamic stress levels of the blades are reduced and the circumferential arrangement of the fir type blade root is further perfected.
Description
Technical field
The present invention relates to a kind of steam turbine blade, especially a kind ofly for steam turbine blade, be arranged on the blade root in impeller or rotating shaft.
Background technique
Blade is the important spare part in turbomachinery, and blade root is the coupling member in impeller or rotating shaft blades installation, is carrying centrifugal force and other load that blade is huge.Improve leaf and root structure and can effectively reduce its stress level, improve blade operational reliability.On at present domestic and international steam turbine, the blade root of normal application has the structural types such as T shape, outsourcing T shape, outsourcing double-T, fork-shaped, fir-tree type and bacterium property, and these several form blade roots mainly contain following characteristics.
T-shaped blade root: simple in structure, processing and assembling is convenient, reliable operation but its bearing capacity is little, is only applied on the short blade that centrifugal force is less.
The T-shaped blade root of outsourcing: when wheel rim produces after resiliently deformable under centrifugal action, will occur a recurvation square on outsourcing convex shoulder, the middle linear leaf that applied centrifugal force increases.
The double-T shaped blade root of outsourcing: be mainly applicable on the medium altitude blade of the wide blade profile that centrifugal force is very large.
Bacterial type blade root: leaf and root structure is more reasonable, can give full play to the strength character of blade and impeller material.
Multifork root: bearing capacity is relevant with fork number, and the more bearing capacitys of fork number are larger, are generally used for what moving vane of end that centrifugal force is large.
Fir-tree root: fir-tree root has compact structure, the feature such as intensity is good, but fitting surface is many, and technological requirement is high, this also with being widely used on high-power unit.
Disclosed patent documentation and periodical publication:
In the databases such as all places database (renewal on April 11st, 2014) CDDB, Digital Journals, meeting paper, scientific and technological achievement, patented technology, policies and regulations, retrieve, field is as " fir-tree root ", " leaf and root structure optimization ", " outsourcing fir-tree root " etc.
There is subject matter in existing blade root:
1), when fir-tree root is circumferentially installed, because rim axle is spacing to not having, rim axle has reduced more greatly the surface of contact of blade root and wheel rim to outer displacement, thus cause wheel rim and blade root stress larger;
2) running up of steam turbine makes blade produce larger dynamic stress, affects blade working life, may cause steamer security incident.
Summary of the invention
Problem to be solved by this invention is: when fir-tree root is circumferentially installed for turbine vane, outside Zhang Weiyi is larger for rim axle, blade root and wheel rim area of contact reduce, rim stress is larger, the technical problem that causes turbine vane safety reliability to reduce, and a kind of outsourcing fir-tree root of circumferentially installing for blade is provided.
For achieving the above object, technological scheme of the present invention: a kind of outsourcing fir-tree root of circumferentially installing for blade, comprise fir-tree root, caulking strip, be characterized in: fir-tree root and wheel rim connecting end are provided with toothed surface, connecting end upper-end surface is provided with blade root outsourcing convex shoulder, and connecting end bottom surface and wheel rim contacting point are placed with caulking strip.
Fir-tree root and wheel rim are in contact with one another by toothed surface, and blade root outsourcing convex shoulder is connected with the contact of wheel rim convex shoulder.
The invention has the beneficial effects as follows:
Outsourcing fir-tree root of the present invention, compare existing fir-tree root form and have the following advantages:
1, the axial displacement of restriction wheel rim, has increased blade root and wheel rim area of contact;
2, the stress level that reduces blade root and wheel rim, has increased blade safety reliability;
3, increase the firm degree that blade is connected with impeller, reduce blade dynamic stress level.
4, reduce to a greater degree rim stress level, give full play to blade and impeller material strength character.
Accompanying drawing explanation
Fig. 1 is structure sectional view of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1, a kind of outsourcing fir-tree root of circumferentially installing for blade, comprises fir-tree root 5, caulking strip 4.
Fir-tree root 5 is provided with toothed surface with wheel rim 3 connecting ends, and connecting end upper-end surface is provided with blade root outsourcing convex shoulder 1, and connecting end bottom surface and wheel rim 3 contacting points are placed with caulking strip 4.
Fir-tree root 5 is in contact with one another by toothed surface with wheel rim 3, and blade root outsourcing convex shoulder 1 is connected with 2 contacts of wheel rim convex shoulder.
The basic principle of leaf and root structure of the present invention:
Blade root 5 is in contact with one another by toothed surface with wheel rim 3, and has caulking strip 4 to retrain blade root radial displacement.Blade root outsourcing convex shoulder 1 contacts with wheel rim convex shoulder 2, thereby has limited the outer Zhang Weiyi of wheel rim 3 under centrifugal action, is conducive to like this increase the area of contact of blade root 5 and wheel rim 3, thereby reduces the stress level of blade root 5 and wheel rim 3.The application of blade root outsourcing convex shoulder 1, wheel rim convex shoulder 2 and caulking strip 4, has increased the firm degree that be connected of blade root 5 with wheel rim 3, thereby has reduced the dynamic stress level of blade simultaneously.
The present invention incorporates externally-packed structure the design of fir-tree root, has limited wheel rim and has opened axial displacement outward, has increased the area of contact of blade root and wheel rim, greatly reduces blade root and wheel rim and blade root stress level, improves the safety reliability of steamer.Externally-packed structure makes rim stress have larger reduction effect than blade root stress, can give full play to blade and impeller material strength character, and blade root intensity is more easily met design requirement.Simultaneously outsourcing fir-tree root structural type can increase the firm degree that blade is connected with impeller, thereby has reduced blade dynamic stress level, the further perfect circumferential installation of fir-tree root.
Claims (2)
1. an outsourcing fir-tree root of circumferentially installing for blade, comprise fir-tree root (5), caulking strip (4), it is characterized in that: described fir-tree root (5) is provided with toothed surface with wheel rim (3) connecting end, connecting end upper-end surface is provided with blade root outsourcing convex shoulder (1), and connecting end bottom surface and wheel rim (3) contacting point is placed with caulking strip (4).
2. according to claim 1 for the circumferential outsourcing fir-tree root of installing of blade, it is characterized in that: described fir-tree root (5) is in contact with one another and is connected by toothed surface with wheel rim (3), blade root outsourcing convex shoulder (1) is connected with wheel rim convex shoulder (2) contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410281867.9A CN104018888A (en) | 2014-06-23 | 2014-06-23 | Wrapping fir type blade root for circumferentially installing blades |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410281867.9A CN104018888A (en) | 2014-06-23 | 2014-06-23 | Wrapping fir type blade root for circumferentially installing blades |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104018888A true CN104018888A (en) | 2014-09-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410281867.9A Pending CN104018888A (en) | 2014-06-23 | 2014-06-23 | Wrapping fir type blade root for circumferentially installing blades |
Country Status (1)
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| CN (1) | CN104018888A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109441568A (en) * | 2018-11-16 | 2019-03-08 | 华电电力科学研究院有限公司 | A kind of efficient low voltage partition plate covering device and its assembly method |
| CN110005637A (en) * | 2018-01-04 | 2019-07-12 | 中国航发商用航空发动机有限责任公司 | Axial-flow type aeroengine rotor |
| CN113623019A (en) * | 2020-05-09 | 2021-11-09 | 中国石化工程建设有限公司 | Moving blade assembly of flue gas turbine and flue gas turbine |
| CN109441568B (en) * | 2018-11-16 | 2024-04-19 | 华电电力科学研究院有限公司 | High-efficiency low-pressure baffle plate sleeve device and assembly method thereof |
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| CH655547B (en) * | 1981-11-10 | 1986-04-30 | ||
| US4820126A (en) * | 1988-02-22 | 1989-04-11 | Westinghouse Electric Corp. | Turbomachine rotor assembly having reduced stress concentrations |
| JPH08105301A (en) * | 1994-09-30 | 1996-04-23 | Gec Alsthom Electromec Sa | Reducing device of stress peak in anchor containing so-called "fir tree-shaped leg"-shaped root section of turbine blade |
| CN2931795Y (en) * | 2006-07-07 | 2007-08-08 | 哈尔滨汽轮机厂有限责任公司 | 169mm vane special for 100MW and 200MW steam turbine |
| CN102689022A (en) * | 2012-06-12 | 2012-09-26 | 哈尔滨汽轮机厂有限责任公司 | Tooth-shaped blade root slot machining method of low-pressure rotor final-stage impeller of turbine |
| CN203374321U (en) * | 2013-05-24 | 2014-01-01 | 华电国际电力股份有限公司山东分公司 | Moving blade of low-pressure rotor |
| CN203978509U (en) * | 2014-06-23 | 2014-12-03 | 中国船舶重工集团公司第七0四研究所 | The outsourcing fir-tree root of circumferentially installing for blade |
-
2014
- 2014-06-23 CN CN201410281867.9A patent/CN104018888A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH655547B (en) * | 1981-11-10 | 1986-04-30 | ||
| US4820126A (en) * | 1988-02-22 | 1989-04-11 | Westinghouse Electric Corp. | Turbomachine rotor assembly having reduced stress concentrations |
| JPH08105301A (en) * | 1994-09-30 | 1996-04-23 | Gec Alsthom Electromec Sa | Reducing device of stress peak in anchor containing so-called "fir tree-shaped leg"-shaped root section of turbine blade |
| CN2931795Y (en) * | 2006-07-07 | 2007-08-08 | 哈尔滨汽轮机厂有限责任公司 | 169mm vane special for 100MW and 200MW steam turbine |
| CN102689022A (en) * | 2012-06-12 | 2012-09-26 | 哈尔滨汽轮机厂有限责任公司 | Tooth-shaped blade root slot machining method of low-pressure rotor final-stage impeller of turbine |
| CN203374321U (en) * | 2013-05-24 | 2014-01-01 | 华电国际电力股份有限公司山东分公司 | Moving blade of low-pressure rotor |
| CN203978509U (en) * | 2014-06-23 | 2014-12-03 | 中国船舶重工集团公司第七0四研究所 | The outsourcing fir-tree root of circumferentially installing for blade |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110005637A (en) * | 2018-01-04 | 2019-07-12 | 中国航发商用航空发动机有限责任公司 | Axial-flow type aeroengine rotor |
| CN110005637B (en) * | 2018-01-04 | 2021-03-26 | 中国航发商用航空发动机有限责任公司 | Axial-flow type aircraft engine rotor |
| CN109441568A (en) * | 2018-11-16 | 2019-03-08 | 华电电力科学研究院有限公司 | A kind of efficient low voltage partition plate covering device and its assembly method |
| CN109441568B (en) * | 2018-11-16 | 2024-04-19 | 华电电力科学研究院有限公司 | High-efficiency low-pressure baffle plate sleeve device and assembly method thereof |
| CN113623019A (en) * | 2020-05-09 | 2021-11-09 | 中国石化工程建设有限公司 | Moving blade assembly of flue gas turbine and flue gas turbine |
| CN113623019B (en) * | 2020-05-09 | 2023-09-15 | 中国石化工程建设有限公司 | Flue gas turbine moving blade assembly and flue gas turbine |
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Application publication date: 20140903 |