CN115992792A - Wind power blade root connection structure and design method thereof - Google Patents
Wind power blade root connection structure and design method thereof Download PDFInfo
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- CN115992792A CN115992792A CN202310176624.8A CN202310176624A CN115992792A CN 115992792 A CN115992792 A CN 115992792A CN 202310176624 A CN202310176624 A CN 202310176624A CN 115992792 A CN115992792 A CN 115992792A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
Wind-powered electricity generation blade root connection structure, including wind-powered electricity generation blade's leaf root and the variable oar bearing of connection leaf root and wheel hub, variable oar bearing inner circle is fixed with wheel hub, and variable oar bearing inner circle passes through connecting bolt with the root portion and is connected its characterized in that: the blade root part is fixedly connected with the inner ring of the variable-pitch bearing through a separation-preventing bolt, and the connecting bolt penetrates through the inner ring of the variable-pitch bearing and the flange connecting piece and is fixedly connected with the blade root part. The invention increases the axial and bending rigidity of the pitch bearing and prolongs the fatigue life of the pitch bearing; the separation interface of the connected piece between the pitch bearing and the blade root is reduced, and the bending stress of the connecting bolt is reduced, so that the fatigue life of the connecting bolt is prolonged, the cost can be effectively reduced, and the practicability is higher. The invention further provides a design method of the wind power blade root connection structure.
Description
Technical Field
The invention relates to a wind power blade root connection structure and a design method thereof, and belongs to the technical field of wind power blade root connection.
Background
Wind-powered electricity generation blade passes through the blade root connecting bolt and is connected with complete machine variable pitch bearing, and when the fan was operated, whole blade aerodynamic load all was born by blade root connection structure, therefore, the structural design of blade root connection is crucial.
The blade root connecting bolt is a stud, one side of the blade root connecting bolt is connected with the blade, the other side of the blade root connecting bolt penetrates through the flange and the variable pitch bearing, and the blade root connecting bolt is fixed on the variable pitch bearing of the whole machine through a nut. The variable-pitch bearing has higher cost, is as light and thin as possible in design and has large bearing capacity; the connecting bolt belongs to a friction type high-strength bolt, when the blade runs, the connecting bolt bears a stretch bending load, and the stress variation of the bolt caused by the general tension and bending moment is equivalent, namely the fatigue damage caused by the tension and bending moment is close. Under the condition that the pitch circle of the blade root is unchanged, the axial rigidity and the bending rigidity of the connected piece are increased, so that the fatigue life of the connecting bolt can be prolonged, the deformation of the pitch bearing is reduced, and for example, the pitch bearing is directly thickened, so that the method is the most effective means for prolonging the fatigue life of the wind power blade connecting bolt. However, under the condition that the pitch circle is unchanged and the blade length and the load are continuously increased, the wind power blade root is connected with a thicker pitch flange, the fatigue strength requirement of the connecting bolt cannot be met gradually, and in order to ensure the economy, the thickness of the pitch bearing cannot be increased limitlessly.
Disclosure of Invention
According to the wind power blade root connection structure and the design method thereof, the axial and bending rigidity of the pitch bearing is increased, and the fatigue life of the pitch bearing is prolonged; the separation interface of the connected piece between the pitch bearing and the blade root is reduced, and the bending stress of the connecting bolt is reduced, so that the fatigue life of the connecting bolt is prolonged, the cost can be effectively reduced, and the practicability is higher.
In order to achieve the above purpose, the invention adopts the following technical scheme:
wind-powered electricity generation blade root connection structure, including wind-powered electricity generation blade's leaf root and the variable oar bearing of connection leaf root and wheel hub, variable oar bearing inner circle is fixed with wheel hub, and variable oar bearing inner circle passes through connecting bolt with the root portion and is connected its characterized in that: the blade root part is fixedly connected with the inner ring of the variable-pitch bearing through a separation-preventing bolt, and the connecting bolt penetrates through the inner ring of the variable-pitch bearing and the flange connecting piece and is fixedly connected with the blade root part.
Preferably, the flange connecting piece comprises a connecting disc coaxially arranged on the inner end face of the inner circle of the variable-pitch bearing and a flange clamped between the blade root part and the connecting disc, the anti-separation bolt is parallel to the connecting bolt, and the anti-separation bolt passes through the connecting disc to be fastened in the inner circle of the variable-pitch bearing.
Preferably, bolt sleeves corresponding to the connecting bolts are embedded in the root parts of the blades, through holes for the connecting bolts to pass through are formed in the inner ring of the variable-pitch bearing and the flange connecting piece, and the anti-separation bolts are symmetrically arranged on the inner side and the outer side of the through holes and uniformly distributed along the circumferential direction of the connecting disc.
Preferably, the inner diameter of the connecting disc is smaller than the outer diameter of the flange, the outer diameter is larger than the outer diameter of the flange, the inner diameter of the flange is equal to the inner diameter of the end face of the blade root, and the outer diameter is equal to the outer diameter of the end face of the blade root.
Preferably, the connecting bolt comprises an inner end thread section, an outer end thread section and a polish rod section integrally formed between the inner thread section and the outer end thread section, the diameter of the inner end thread section and the diameter of the outer end thread section are both larger than those of the polish rod section, the polish rod section and the inner end thread section are in transition through an inner conical section, the light section rod and the outer end thread section are in transition through an outer conical section, the inner end thread section is fastened in threaded fit with a bolt sleeve, and the outer end thread section extends out of the pitch bearing inner ring to be fastened in fit with a locking nut.
Preferably, a conical inner wall matched with the outer conical section is arranged in the through hole of the inner ring of the variable pitch bearing, and the inner end thread section is separated from the inner end of the bolt sleeve and is not in contact with the inner end of the bolt sleeve.
The design method of the wind power blade root connection structure is characterized by comprising the following steps of: according to the length, load and preset bearing range of the connecting bolt and the preset bearing range of the variable pitch bearing, the structure and thickness of the flange connecting piece, the distribution position and number of the anti-separation bolts and the fastening force between the single anti-separation bolt and the inner ring of the variable pitch bearing are designed.
The invention has the beneficial effects that:
according to the wind power blade root connecting structure, the flange connecting piece clamped between the inner ring of the pitch bearing and the blade root is fixedly connected with the inner ring of the pitch bearing through the separation preventing bolt, so that the inner ring of the pitch bearing is quite reinforced, the axial direction and the bending rigidity of the pitch bearing are increased, the deformation rate of the pitch bearing under the action of the blade root bending moment is reduced, the bearing capacity is improved, the bending deformation of the pitch bearing is reduced, and the fatigue life of the pitch bearing is prolonged; the anti-separation bolt fastens the flange connecting piece on the inner ring of the pitch bearing, reduces the separation interface of the connected piece between the pitch bearing and the blade root, reduces the bending moment of the connecting bolt when the connecting bolt bears the bending load, shares a part of the bending load for the connecting bolt, reduces the bending stress of the connecting bolt, prolongs the fatigue life of the connecting bolt, and prolongs the fatigue life of the connecting bolt compared with the method for prolonging the fatigue life of the connecting bolt by increasing the thickness of the pitch bearing.
Drawings
FIG. 1 is a schematic illustration of a blade root connection configuration for a wind turbine blade in an embodiment.
Fig. 2 is an enlarged partial schematic view at a in fig. 1.
Fig. 3 is a schematic view of a connecting bolt.
FIG. 4 is a schematic illustration of an inner end thread segment spaced from the inner end of a bolt housing without contact.
Detailed Description
Embodiments of the present invention are described in detail below with reference to fig. 1 to 4.
Wind-powered electricity generation blade root connection structure, including wind-powered electricity generation blade root 1 and the variable pitch bearing 3 of connection blade root 1 and wheel hub 2, variable pitch bearing outer lane 31 is fixed with wheel hub 2, and variable pitch bearing inner circle 32 passes through connecting bolt 4 with blade root 1 and is connected its characterized in that: the blade root part 1 is fixedly connected with the rotor bearing inner ring 32 through the anti-separation bolt 6, and the connecting bolt 4 penetrates through the rotor bearing inner ring 32 and the flange connecting piece 5 and is fixedly connected with the blade root part 1.
In the wind power blade root connecting structure, the flange connecting piece 5 clamped between the variable pitch bearing inner ring 32 and the blade root part 1 is fixedly connected with the variable pitch bearing inner ring 32 through the anti-separation bolt 6, so that the variable pitch bearing inner ring 32 is quite reinforced, the axial and bending rigidity of the variable pitch bearing is increased, the deformation rate of the variable pitch bearing is reduced under the action of the blade root bending moment, the bearing capacity is improved, the bending deformation of the variable pitch bearing is reduced, and the fatigue life of the variable pitch bearing is prolonged; the anti-separation bolt 6 fastens the flange connecting piece 5 on the inner ring of the pitch bearing, reduces the separation interface of the connected piece between the pitch bearing and the blade root part 1, reduces the bending moment of the connecting bolt when the connecting bolt 4 bears the stretch bending load, shares a part of the stretch bending load for the connecting bolt 4, reduces the bending stress of the connecting bolt 4, thereby prolonging the fatigue life of the connecting bolt 4.
The flange connector 5 comprises a connecting disc 51 coaxially arranged on the inner end face of the inner circle 32 of the pitch bearing and a flange 52 clamped between the blade root 1 and the connecting disc 51, the anti-separation bolt 6 is parallel to the connecting bolt 4, and the anti-separation bolt 6 passes through the connecting disc 51 to be fastened in the inner circle 32 of the pitch bearing. The flange connecting piece 5 can be just a single-layer flange, the flange is directly fixed on the end face of the inner ring 32 of the pitch bearing by the anti-separation bolt 6, the separation interface of the pitch bearing and the blade root 1 by the connecting piece is reduced, when the length of the blade is increased and the stretch bending load is larger, the flange connecting piece 5 is divided into two layers of the flange 52 and the connecting disc 51, so that the connection strength of the connecting bolt is increased, the connecting disc 51 is fastened on the inner ring 32 of the pitch bearing by the anti-separation bolt 6, the connecting disc 51 and the pitch bearing are fastened into a whole, the pitch bearing is reinforced, meanwhile, the separation interface of the pitch bearing and the blade root 1 by the connecting piece is reduced, the bending moment of the connecting bolt is reduced when the connecting bolt 4 bears the stretch bending load, and the fatigue life of the connecting bolt and the pitch bearing is prolonged.
Wherein, the bolt sleeve 7 corresponding to the connecting bolt 4 is pre-buried in the leaf root 1, through holes 8 for the connecting bolt 4 to pass through are respectively arranged on the variable pitch bearing inner ring 32 and the flange connecting piece 5, and the anti-separation bolts 6 are symmetrically arranged on the inner side and the outer side of the through holes 8 and are uniformly distributed along the circumferential direction of the connecting disc 51. As shown in fig. 2, the anti-separation bolts 6 are arranged on the inner side and the outer side of the connecting bolt 4, so that the fastening reliability of the connecting disc 51 and the inner ring 32 of the pitch bearing is improved, more stretch bending load is shared for the connecting bolt 4, and the bending stress of the connecting bolt 4 is reduced.
Wherein, the inner diameter of the connecting disc 51 is smaller than the outer diameter of the flange 52, the outer diameter is larger than the outer diameter of the flange 52, the inner diameter of the flange 52 is equal to the inner diameter of the end face of the blade root part 1, and the outer diameter is equal to the outer diameter of the end face of the blade root part 1. It can be seen from the figures that the radial thickness of the connecting disc 51 is greater, which forms a support protection for the flange 52 and the edges of the pitch bearing inner ring, increasing the bending stiffness of the flange connection 5, so that the flange connection 5 can carry increased bending loads without deformation.
The connecting bolt 4 comprises an inner end thread section 41, an outer end thread section 42 and a polish rod section 43 integrally formed between the inner thread section 41 and the outer end thread section 42, the diameter of the inner end thread section 41 and the diameter of the outer end thread section 42 are both larger than those of the polish rod section 43, the polish rod section 43 and the inner end thread section 41 are in transition through an inner conical section 44, the light rod section 43 and the outer end thread section 42 are in transition through an outer conical section 45, the inner end thread section 41 is in threaded fit fastening with the bolt sleeve 7, and the outer end thread section 42 extends out of the pitch bearing inner ring 32 to be in fit fastening with the locking nut 9. The inner conical section 44 and the outer conical section 45 increase the connection strength between the polish rod section 43 and the inner and outer thread sections, meanwhile, the diameter of the polish rod section 43 is smaller, the inner diameter of the through hole 8 is reduced, and the influence of the opening of the through hole 8 on the strength of the flange connector 5 and the variable-pitch bearing inner ring 32 is reduced.
Wherein, set up the toper inner wall with outer toper section 45 complex in the through-hole 8 of pitch bearing inner race 32, carry out axial positioning to connecting bolt 4 through the cooperation of toper inner wall and outer toper section 45, improve the fastening connection's of connecting bolt 4 stability, inner thread section 41 separates contactless with the inner of bolt housing 7, can see from fig. 4 that inner thread section 41 does not reach the inner of bolt housing 7, avoid forming the damage to blade root 1 because of connecting bolt 4 axial atress transmits to blade root 1.
The design method of the wind power blade root connection structure is characterized by comprising the following steps of: the structure and thickness of the flange connection 5, the distribution position and number of the anti-separation bolts 6, and the fastening force between the single anti-separation bolt 6 and the inner ring 32 of the pitch bearing are designed according to the length, load, preset bearing range of the connection bolt and preset bearing range of the pitch bearing.
According to the design method, the flange connection piece 5 and the anti-separation bolt 6 are designed according to the preset bearing ranges of the length and the load of the blade and the connecting bolt and the pitch bearing, the flange connection piece 5 and the anti-separation bolt 6 are connected between the pitch bearing 3 and the blade root 1, the bearing capacity and the rigidity of the pitch bearing 3 are improved, the bending rigidity of the pitch bearing 3 can meet the rigidity requirement in the bearing process, the bending deformation of the pitch bearing 3 is effectively reduced, the anti-separation bolt 6 shares the stretch bending load of a part of the connecting bolt 4, the bearing of the anti-separation bolt 6 and the bearing of the connecting bolt 4 can meet the bearing requirement of the blade load, the bending stress of the connecting bolt 4 is reduced, and the fatigue life of the connecting bolt 4 is prolonged.
The foregoing disclosure of embodiments of the present invention has been fully described with reference to the accompanying drawings, in which it is to be understood that the embodiments described are merely some of the embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (7)
1. Wind-powered electricity generation blade root connection structure, including wind-powered electricity generation blade's leaf root and the variable oar bearing of connection leaf root and wheel hub, variable oar bearing inner circle is fixed with wheel hub, and variable oar bearing inner circle passes through connecting bolt with the root portion and is connected its characterized in that: the blade root part is fixedly connected with the inner ring of the variable-pitch bearing through a separation-preventing bolt, and the connecting bolt penetrates through the inner ring of the variable-pitch bearing and the flange connecting piece and is fixedly connected with the blade root part.
2. The wind power blade root connection structure according to claim 1, wherein: the flange connecting piece comprises a connecting disc coaxially arranged on the inner end face of the inner circle of the variable-pitch bearing and a flange clamped between the blade root part and the connecting disc, wherein the anti-separation bolt is parallel to the connecting bolt and passes through the connecting disc to be fastened in the inner circle of the variable-pitch bearing.
3. The wind power blade root connection structure according to claim 2, wherein: bolt sleeves corresponding to the connecting bolts are embedded in the root parts of the blades, through holes for the connecting bolts to pass through are formed in the inner ring of the variable pitch bearing and the flange connecting piece, and the anti-separation bolts are symmetrically arranged on the inner side and the outer side of the through holes and are uniformly distributed along the circumferential direction of the connecting disc.
4. A wind power blade root connection according to claim 3, wherein: the inner diameter of the connecting disc is smaller than the outer diameter of the flange, the outer diameter of the connecting disc is larger than the outer diameter of the flange, the inner diameter of the flange is equal to the inner diameter of the end face of the blade root, and the outer diameter of the connecting disc is equal to the outer diameter of the end face of the blade root.
5. A wind power blade root connection according to claim 3, wherein: the connecting bolt comprises an inner end thread section, an outer end thread section and a polish rod section integrally formed between the inner thread section and the outer end thread section, the diameter of the inner end thread section and the diameter of the outer end thread section are both larger than those of the polish rod section, the polish rod section and the inner end thread section are in transition through an inner conical section, the light section rod and the outer end thread section are in transition through an outer conical section, the inner end thread section is fastened in threaded fit with a bolt sleeve, and the outer end thread section extends out of the variable-pitch bearing inner ring to be fastened in fit with a locking nut.
6. The wind power blade root connection structure according to claim 5, wherein: the through hole of the inner ring of the variable pitch bearing is internally provided with a conical inner wall matched with the outer conical section, and the threaded section at the inner end is separated from the inner end of the bolt sleeve and is not contacted with the inner end of the bolt sleeve.
7. The method for designing a wind power blade root connection structure according to any one of claims 1 to 6, characterized in that: according to the length, load and preset bearing range of the connecting bolt and the preset bearing range of the variable pitch bearing, the structure and thickness of the flange connecting piece, the distribution position and number of the anti-separation bolts and the fastening force between the single anti-separation bolt and the inner ring of the variable pitch bearing are designed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310176624.8A CN115992792A (en) | 2023-02-28 | 2023-02-28 | Wind power blade root connection structure and design method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310176624.8A CN115992792A (en) | 2023-02-28 | 2023-02-28 | Wind power blade root connection structure and design method thereof |
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| CN115992792A true CN115992792A (en) | 2023-04-21 |
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| CN202310176624.8A Pending CN115992792A (en) | 2023-02-28 | 2023-02-28 | Wind power blade root connection structure and design method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116164022A (en) * | 2023-04-23 | 2023-05-26 | 新创碳谷集团有限公司 | Wind-powered electricity generation blade root bolt housing and blade root connection structure |
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2023
- 2023-02-28 CN CN202310176624.8A patent/CN115992792A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116164022A (en) * | 2023-04-23 | 2023-05-26 | 新创碳谷集团有限公司 | Wind-powered electricity generation blade root bolt housing and blade root connection structure |
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