CN101285400A - Firtree-type bucket root rotor blades - Google Patents
Firtree-type bucket root rotor blades Download PDFInfo
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- CN101285400A CN101285400A CNA2008100446341A CN200810044634A CN101285400A CN 101285400 A CN101285400 A CN 101285400A CN A2008100446341 A CNA2008100446341 A CN A2008100446341A CN 200810044634 A CN200810044634 A CN 200810044634A CN 101285400 A CN101285400 A CN 101285400A
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- blade
- root
- wedge groove
- blade root
- wedge
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Abstract
The invention discloses a fir-tree type blade root rotor blade, which has a whole structure composed of a blade body, a blade root and a blade shroud, wherein the blade root has a root-type part and an intermediate part, wedge slots are arranged on the radial plane of the intermediate part, tips of the wedge slots point to a circumference and adaptive wedge plates are arranged in the wedge slots; an inclination angle of the wedge slots meets a relation formula: tg(B) is less than f (in the format: B refers to the bevel angle of the wedge slots; f refers to the friction factor between the wedge slots and the wedge plates). The fir-tree type blade root rotor blade has the advantages that blade root intermediate parts of two adjacent blades have mutual pressing tightness and all blades are squeezed circumferentially.
Description
Technical field
The present invention relates to steam turbine blade, relate in particular to a kind of Firtree-type bucket root rotor blades.
Background technique
To be steam turbine be converted into the main element of mechanical energy with heat energy to blade, and its moving vane vibration stress when work is the main factor that causes blade to damage.
The basic structure of moving vane is seen Fig. 1, has blade 1, blade root 2, integral shroud 3, and wherein, blade root 2 has upper and lower two parts, the one, and the root type part of bottom, the 2nd, the intermediate part 4 on top.Assembling is during blade, and the root type of blade root 2 is partially submerged in the race of impeller, and intermediate 4 is positioned at outside the race of impeller, and all blades are packed into behind the impeller, and the blade root intermediate of adjacent blades is in contact with one another, and constitutes ring-type.
The design of many decades both at home and abroad, research and operation practice all show, intermediate 4 jam-packed degree each other has very important influence to the vibratory response of blade.For this reason, blade root intermediate 4 must have suitable mutual extrusion tightness (see figure 2).
For moving vane from circumferential loading type (as T shape blade root and bacterial type blade root) or top plug-in type (as multifork root), this accomplishes easily, but, for for the moving vane of the fir-tree root of axially packing into, realize that above-mentioned blade root intermediate has the mutual extrusion tightness, no matter being on blade structure, on assembly technology, all is very difficult still.Therefore, all steam turbine manufacturing firms only require that all the blade root intermediate of circumferential loading type, top plug-in type moving vane has the mutual extrusion tightness at present, and allow from gapped between the fir-tree root intermediate of axially packing into, mutual extrusion not, its negative consequence is: vibration stress is big, be unfavorable for the safety of blade, and increased leakage losses.The real genus of this permission is helpless, is the technological means of dealing with problems because of not finding.
Summary of the invention
Purpose of the present invention provides a kind of Firtree-type bucket root rotor blades, and this blade can make the blade root intermediate that the mutual extrusion tightness is arranged.
Technical solution of the present invention is:
A kind of Firtree-type bucket root rotor blades has integrally-built blade, blade root, integral shroud, and wherein, described blade root has root type part and intermediate part, is provided with the wedge groove on the sagittal plane of intermediate part, and circumference is pointed at the tip of wedge groove, and adaptive key is arranged in the wedge groove.
Following relation is satisfied at the inclination angle of described wedge groove:
tg(B)＜f
In the formula: B-wedge groove inclination angle of inclined plane;
Friction factor between f-wedge groove, key.
Useful technique effect of the present invention:
When steam turbine operation, key is under centrifugal force F effect, slide in tip to the wedge groove, the inclined-plane of wedge groove is close on the inclined-plane of key, generation effect component N1, and the relative engagement face of adjacent blades blade root intermediate is close at the back side of key, generation effect component N2, like this, make the blade root intermediate of adjacent two blades that the mutual extrusion tightness be arranged, all blades are by circumferential jam-packed.
Description of drawings
Fig. 1 is a blade basic structure schematic representation
Fig. 2 is the blade root intermediate jam-packed view of blade
Fig. 3 is the assembly structure schematic representation of fir-tree root of the present invention
Fig. 4 is the M-M view of Fig. 3
Fig. 5 is the enlarged view of local I among Fig. 4
Fig. 6 is the key working state schematic representation
Embodiment
Referring to Fig. 3, Fig. 4: this Firtree-type bucket root rotor blades has blade 1, blade root 2, integral shroud 3, and wherein, blade root 2 has upper and lower two parts, and the one, the root type part of bottom, the 2nd, the intermediate part 4 on top.Assembling is during blade, and the root type of blade root 2 is partially submerged in the race of impeller 6, and intermediate 4 is positioned at outside the race, and all blades are packed into behind the impeller 6, constitute ring-type, gapped A between the blade root intermediate of adjacent blades, and fitting surface does not contact.
Characteristics of the present invention are: open a wedge groove on the fitting surface of blade root intermediate 4, circumference is pointed at the tip of wedge groove, place adaptive key 5 in the groove, corresponding wedge groove inclined-plane, the inclined-plane of key 5, the fitting surface in opposite directions of the back side of key 5 corresponding adjacent blades blade root intermediate 4 ', see the enlarged view of this structure for details, i.e. Fig. 5.
Referring to Fig. 6, the working principle of this blade structure is: when steam turbine operation, key 5 is under centrifugal force F effect, slide in tip to the wedge groove, the inclined-plane of wedge groove is close on the inclined-plane of key 5, produces normal direction effect component N1, and the fitting surface in opposite directions of adjacent blades blade root intermediate is close at the back side of key 5, produce normal direction effect component N2, the relation of each active force is as follows:
N1＝F/sin(B) (1)
N2＝F/tg(B) (2)
In the formula: B-wedge groove inclination angle of inclined plane; F-key centrifugal force; N1-key inclined plane method is to effect component;
N2-key back side normal direction effect component.
Like this, make the blade root intermediate of adjacent two blades that the mutual extrusion tightness be arranged, all blades are by circumferential jam-packed.
Obviously, the inclination angle of jam-packed power and wedge groove, the quality of key 5 and the velocity correlation of rotor operation are during design, rotor operation speed is considered according to the steam turbine rated speed, be constant, the quality of key also should not be too big, otherwise the wedge groove is oversize, the intensity of blade root intermediate 4 will be influenced, also should get a constant, therefore, angle of inclination B that should be by appropriate design wedge groove ° satisfies the requirement of jam-packed power, when angle of inclination B ° enough hour, jam-packed power can meet the requirements.
The angle of inclination B of wedge groove ° can design in the following relationship:
tg(B)＜f
In the formula: B-wedge groove inclination angle of inclined plane;
Friction factor between f-wedge groove, key.
In the actual engineering,, for example,, can design two or more wedge grooves, key, perhaps design a wide wedge groove, place two or polylith key side by side for large-sized blade because specification, the size difference of blade are answered flexible design wedge groove, key.
Claims (2)
1. a Firtree-type bucket root rotor blades has integrally-built blade, blade root, integral shroud, wherein, described blade root has root type part and intermediate part, it is characterized in that being provided with the wedge groove on the sagittal plane of intermediate part, circumference is pointed at the tip of wedge groove, and adaptive key is arranged in the wedge groove.
2. Firtree-type bucket root rotor blades according to claim 1 is characterized in that following relation is satisfied at the inclination angle of described wedge groove:
tg(B)＜f
In the formula: B-wedge groove inclination angle of inclined plane;
Friction factor between f-wedge groove, key.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100446341A CN101285400A (en) | 2008-06-03 | 2008-06-03 | Firtree-type bucket root rotor blades |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100446341A CN101285400A (en) | 2008-06-03 | 2008-06-03 | Firtree-type bucket root rotor blades |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101285400A true CN101285400A (en) | 2008-10-15 |
Family
ID=40057782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100446341A Pending CN101285400A (en) | 2008-06-03 | 2008-06-03 | Firtree-type bucket root rotor blades |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101285400A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104179534A (en) * | 2014-08-04 | 2014-12-03 | 杭州汽轮机股份有限公司 | Large-damping regulating-stage blade for high-pressure and high-rotational-speed industrial steam turbine |
-
2008
- 2008-06-03 CN CNA2008100446341A patent/CN101285400A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102102545B (en) * | 2011-03-22 | 2013-11-27 | 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 |
| CN104179534A (en) * | 2014-08-04 | 2014-12-03 | 杭州汽轮机股份有限公司 | Large-damping regulating-stage blade for high-pressure and high-rotational-speed industrial steam turbine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20081015 |